GNU logs - #76998, boring messages

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Subject: bug#76998: user shepherd stays around with some zombies
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Steps to reproduce:

1. Log into the console using your regular user
2. Log into GUI using your regular user
3. Log out of GUI
4. Switch to logged-in console
5. Run "px --tree" there
6. Observe the following:

shepherd(1)
   accounts-daemon(1110)
   avahi-daemon:(2443)
     avahi-daemon:(2446)
   bluetoothd(1026)
   colord(25587)
   cupsd(2440)
   dbus-daemon(769)
   dnsmasq(1845)
     dnsmasq(1846)
   earlyoom(744)
   elogind(1024)
   gdm(1038)
   guix-daemon(740)
   libvirtd(1023)
   login(26536)
     -bash(6739)
   mcron(747)
   mingetty... (5×)
   ModemManager(1276)
   NetworkManager(1256)
   nginx:(797)
     nginx:(798)
   nscd(2177)
   polkitd(1231)
   postgres(852)
     postgres:... (6×)
   rasdaemon(796)
   rpc.idmapd(2447)
   rpc.mountd(2501)
   rpc.statd(2444)
   rpcbind(2441)
   shepherd(6395) <--- also dannym
     [dbus-daemon](6397)
     [ssh-agent](6444)
     [xdg-permission-](6411)
     wireplumber(6399)
   shepherd(26114) <--- dannym
     dbus-daemon(6881)
     pipewire(6882)
     pipewire-pulse(6883)
     ssh-agent(6880)
     wireplumber(6888)
     xdg-permission-store(7259)
   udevd(330)
   upowerd(1025)
   virtlogd(742)
   wpa_supplicant(1045)

Those "[...]" with brackets mean that these processes were not reaped 
(so is defunct).

What the hell?

$ guix describe
Generation 194	Mar 13 2025 19:11:33	(current)
   guix 678b3dd
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: dannym@HIDDEN
Subject: bug#76998: Acknowledgement (user shepherd stays around with some
 zombies)
Message-ID: <handler.76998.B.174189305527846.ack <at> debbugs.gnu.org>
References: <fc9ad8bb0188a074005a1eb1648cb755@HIDDEN>
X-Gnu-PR-Message: ack 76998
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Reply-To: 76998 <at> debbugs.gnu.org
Date: Thu, 13 Mar 2025 19:11:02 +0000

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76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
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Message sent to bug-guix@HIDDEN:

Subject: bug#76998: user shepherd stays around with some zombies
Resent-From: Jake <jforst.mailman@HIDDEN>
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From: Jake <jforst.mailman@HIDDEN>
Date: Fri, 14 Mar 2025 09:18:49 +1030
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--000000000000bac56706304120fc
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Is this the same as
https://issues.guix.gnu.org/74912
?

Jake

On Fri, 14 Mar 2025 at 5:41=E2=80=AFam, <dannym@HIDDEN> wrot=
e:

> Steps to reproduce:
>
> 1. Log into the console using your regular user
> 2. Log into GUI using your regular user
> 3. Log out of GUI
> 4. Switch to logged-in console
> 5. Run "px --tree" there
> 6. Observe the following:
>
> shepherd(1)
>    accounts-daemon(1110)
>    avahi-daemon:(2443)
>      avahi-daemon:(2446)
>    bluetoothd(1026)
>    colord(25587)
>    cupsd(2440)
>    dbus-daemon(769)
>    dnsmasq(1845)
>      dnsmasq(1846)
>    earlyoom(744)
>    elogind(1024)
>    gdm(1038)
>    guix-daemon(740)
>    libvirtd(1023)
>    login(26536)
>      -bash(6739)
>    mcron(747)
>    mingetty... (5=C3=97)
>    ModemManager(1276)
>    NetworkManager(1256)
>    nginx:(797)
>      nginx:(798)
>    nscd(2177)
>    polkitd(1231)
>    postgres(852)
>      postgres:... (6=C3=97)
>    rasdaemon(796)
>    rpc.idmapd(2447)
>    rpc.mountd(2501)
>    rpc.statd(2444)
>    rpcbind(2441)
>    shepherd(6395) <--- also dannym
>      [dbus-daemon](6397)
>      [ssh-agent](6444)
>      [xdg-permission-](6411)
>      wireplumber(6399)
>    shepherd(26114) <--- dannym
>      dbus-daemon(6881)
>      pipewire(6882)
>      pipewire-pulse(6883)
>      ssh-agent(6880)
>      wireplumber(6888)
>      xdg-permission-store(7259)
>    udevd(330)
>    upowerd(1025)
>    virtlogd(742)
>    wpa_supplicant(1045)
>
> Those "[...]" with brackets mean that these processes were not reaped
> (so is defunct).
>
> What the hell?
>
> $ guix describe
> Generation 194  Mar 13 2025 19:11:33    (current)
>    guix 678b3dd
>      repository URL: https://git.savannah.gnu.org/git/guix.git
>      branch: master
>      commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2
>
>
>
>

--000000000000bac56706304120fc
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"auto">Is this the same as=C2=A0</div><div dir=3D"auto"><a href=
=3D"https://issues.guix.gnu.org/74912">https://issues.guix.gnu.org/74912</a=
><br>?</div><div dir=3D"auto"><br></div><div dir=3D"auto">Jake</div><div di=
r=3D"auto"><br></div><div dir=3D"auto"><div class=3D"gmail_quote gmail_quot=
e_container" dir=3D"auto"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, 14 =
Mar 2025 at 5:41=E2=80=AFam, &lt;<a href=3D"mailto:dannym@friendly-machines=
.com">dannym@HIDDEN</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1px;b=
order-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"=
>Steps to reproduce:<br>
<br>
1. Log into the console using your regular user<br>
2. Log into GUI using your regular user<br>
3. Log out of GUI<br>
4. Switch to logged-in console<br>
5. Run &quot;px --tree&quot; there<br>
6. Observe the following:<br>
<br>
shepherd(1)<br>
=C2=A0 =C2=A0accounts-daemon(1110)<br>
=C2=A0 =C2=A0avahi-daemon:(2443)<br>
=C2=A0 =C2=A0 =C2=A0avahi-daemon:(2446)<br>
=C2=A0 =C2=A0bluetoothd(1026)<br>
=C2=A0 =C2=A0colord(25587)<br>
=C2=A0 =C2=A0cupsd(2440)<br>
=C2=A0 =C2=A0dbus-daemon(769)<br>
=C2=A0 =C2=A0dnsmasq(1845)<br>
=C2=A0 =C2=A0 =C2=A0dnsmasq(1846)<br>
=C2=A0 =C2=A0earlyoom(744)<br>
=C2=A0 =C2=A0elogind(1024)<br>
=C2=A0 =C2=A0gdm(1038)<br>
=C2=A0 =C2=A0guix-daemon(740)<br>
=C2=A0 =C2=A0libvirtd(1023)<br>
=C2=A0 =C2=A0login(26536)<br>
=C2=A0 =C2=A0 =C2=A0-bash(6739)<br>
=C2=A0 =C2=A0mcron(747)<br>
=C2=A0 =C2=A0mingetty... (5=C3=97)<br>
=C2=A0 =C2=A0ModemManager(1276)<br>
=C2=A0 =C2=A0NetworkManager(1256)<br>
=C2=A0 =C2=A0nginx:(797)<br>
=C2=A0 =C2=A0 =C2=A0nginx:(798)<br>
=C2=A0 =C2=A0nscd(2177)<br>
=C2=A0 =C2=A0polkitd(1231)<br>
=C2=A0 =C2=A0postgres(852)<br>
=C2=A0 =C2=A0 =C2=A0postgres:... (6=C3=97)<br>
=C2=A0 =C2=A0rasdaemon(796)<br>
=C2=A0 =C2=A0rpc.idmapd(2447)<br>
=C2=A0 =C2=A0rpc.mountd(2501)<br>
=C2=A0 =C2=A0rpc.statd(2444)<br>
=C2=A0 =C2=A0rpcbind(2441)<br>
=C2=A0 =C2=A0shepherd(6395) &lt;--- also dannym<br>
=C2=A0 =C2=A0 =C2=A0[dbus-daemon](6397)<br>
=C2=A0 =C2=A0 =C2=A0[ssh-agent](6444)<br>
=C2=A0 =C2=A0 =C2=A0[xdg-permission-](6411)<br>
=C2=A0 =C2=A0 =C2=A0wireplumber(6399)<br>
=C2=A0 =C2=A0shepherd(26114) &lt;--- dannym<br>
=C2=A0 =C2=A0 =C2=A0dbus-daemon(6881)<br>
=C2=A0 =C2=A0 =C2=A0pipewire(6882)<br>
=C2=A0 =C2=A0 =C2=A0pipewire-pulse(6883)<br>
=C2=A0 =C2=A0 =C2=A0ssh-agent(6880)<br>
=C2=A0 =C2=A0 =C2=A0wireplumber(6888)<br>
=C2=A0 =C2=A0 =C2=A0xdg-permission-store(7259)<br>
=C2=A0 =C2=A0udevd(330)<br>
=C2=A0 =C2=A0upowerd(1025)<br>
=C2=A0 =C2=A0virtlogd(742)<br>
=C2=A0 =C2=A0wpa_supplicant(1045)<br>
<br>
Those &quot;[...]&quot; with brackets mean that these processes were not re=
aped <br>
(so is defunct).<br>
<br>
What the hell?<br>
<br>
$ guix describe<br>
Generation 194=C2=A0 Mar 13 2025 19:11:33=C2=A0 =C2=A0 (current)<br>
=C2=A0 =C2=A0guix 678b3dd<br>
=C2=A0 =C2=A0 =C2=A0repository URL: <a href=3D"https://git.savannah.gnu.org=
/git/guix.git" rel=3D"noreferrer" target=3D"_blank">https://git.savannah.gn=
u.org/git/guix.git</a><br>
=C2=A0 =C2=A0 =C2=A0branch: master<br>
=C2=A0 =C2=A0 =C2=A0commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2<br>
<br>
<br>
<br>
</blockquote></div></div>

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severity 76998 important
quit

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merge 74912 76998
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retitle 76998 Guix Home leaves user shepherd on logout, starts new instance on login
quit

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and subject line Re: bug#76998: Guix Home leaves user shepherd on logout, s=
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76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
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Subject: user shepherd stays around with some zombies
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Steps to reproduce:

1. Log into the console using your regular user
2. Log into GUI using your regular user
3. Log out of GUI
4. Switch to logged-in console
5. Run "px --tree" there
6. Observe the following:

shepherd(1)
   accounts-daemon(1110)
   avahi-daemon:(2443)
     avahi-daemon:(2446)
   bluetoothd(1026)
   colord(25587)
   cupsd(2440)
   dbus-daemon(769)
   dnsmasq(1845)
     dnsmasq(1846)
   earlyoom(744)
   elogind(1024)
   gdm(1038)
   guix-daemon(740)
   libvirtd(1023)
   login(26536)
     -bash(6739)
   mcron(747)
   mingetty... (5×)
   ModemManager(1276)
   NetworkManager(1256)
   nginx:(797)
     nginx:(798)
   nscd(2177)
   polkitd(1231)
   postgres(852)
     postgres:... (6×)
   rasdaemon(796)
   rpc.idmapd(2447)
   rpc.mountd(2501)
   rpc.statd(2444)
   rpcbind(2441)
   shepherd(6395) <--- also dannym
     [dbus-daemon](6397)
     [ssh-agent](6444)
     [xdg-permission-](6411)
     wireplumber(6399)
   shepherd(26114) <--- dannym
     dbus-daemon(6881)
     pipewire(6882)
     pipewire-pulse(6883)
     ssh-agent(6880)
     wireplumber(6888)
     xdg-permission-store(7259)
   udevd(330)
   upowerd(1025)
   virtlogd(742)
   wpa_supplicant(1045)

Those "[...]" with brackets mean that these processes were not reaped 
(so is defunct).

What the hell?

$ guix describe
Generation 194	Mar 13 2025 19:11:33	(current)
   guix 678b3dd
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2



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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#76998: Guix Home leaves user shepherd on logout, starts new
 instance on login
In-Reply-To: <874iyrkvx7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Mon, 14 Apr 2025 10:08:04 +0200")
References: <871pukdlyo.fsf@HIDDEN> <874iyrkvx7.fsf@HIDDEN>
Date: Wed, 14 May 2025 18:06:11 +0200
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Cc: Jake <jforst.mailman@HIDDEN>, 74912 <at> debbugs.gnu.org,
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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To: dannym@HIDDEN
Subject: bug#76998: closed (Re: bug#76998: Guix Home leaves user shepherd
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 76998 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#76998: Guix Home leaves user shepherd on logout, starts new
 instance on login
In-Reply-To: <874iyrkvx7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
 =?utf-8?Q?s?= message of "Mon, 14 Apr 2025 10:08:04 +0200")
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Date: Wed, 14 May 2025 18:06:11 +0200
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Cc: Jake <jforst.mailman@HIDDEN>, 74912 <at> debbugs.gnu.org,
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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Date: Thu, 13 Mar 2025 20:10:36 +0100
From: dannym@HIDDEN
To: Bug Guix <bug-guix@HIDDEN>
Subject: user shepherd stays around with some zombies
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Steps to reproduce:

1. Log into the console using your regular user
2. Log into GUI using your regular user
3. Log out of GUI
4. Switch to logged-in console
5. Run "px --tree" there
6. Observe the following:

shepherd(1)
   accounts-daemon(1110)
   avahi-daemon:(2443)
     avahi-daemon:(2446)
   bluetoothd(1026)
   colord(25587)
   cupsd(2440)
   dbus-daemon(769)
   dnsmasq(1845)
     dnsmasq(1846)
   earlyoom(744)
   elogind(1024)
   gdm(1038)
   guix-daemon(740)
   libvirtd(1023)
   login(26536)
     -bash(6739)
   mcron(747)
   mingetty... (5×)
   ModemManager(1276)
   NetworkManager(1256)
   nginx:(797)
     nginx:(798)
   nscd(2177)
   polkitd(1231)
   postgres(852)
     postgres:... (6×)
   rasdaemon(796)
   rpc.idmapd(2447)
   rpc.mountd(2501)
   rpc.statd(2444)
   rpcbind(2441)
   shepherd(6395) <--- also dannym
     [dbus-daemon](6397)
     [ssh-agent](6444)
     [xdg-permission-](6411)
     wireplumber(6399)
   shepherd(26114) <--- dannym
     dbus-daemon(6881)
     pipewire(6882)
     pipewire-pulse(6883)
     ssh-agent(6880)
     wireplumber(6888)
     xdg-permission-store(7259)
   udevd(330)
   upowerd(1025)
   virtlogd(742)
   wpa_supplicant(1045)

Those "[...]" with brackets mean that these processes were not reaped 
(so is defunct).

What the hell?

$ guix describe
Generation 194	Mar 13 2025 19:11:33	(current)
   guix 678b3dd
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2



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Subject: bug#67863: closed (Guix Home leaves user shepherd on logout,
 starts new instance on login)
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Your message dated Wed, 14 May 2025 18:06:11 +0200
with message-id <87tt5nyy6k.fsf_-_@HIDDEN>
and subject line Re: bug#76998: Guix Home leaves user shepherd on logout, s=
tarts new instance on login
has caused the debbugs.gnu.org bug report #76998,
regarding Guix Home leaves user shepherd on logout, starts new instance on =
login
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs@HIDDEN)


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76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
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I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
 
Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
After logging out and in a few times, there are multiple user shepherd processes.
 
Suspected cause:  Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
This seems to be a general issue and not particular to the syncthing home service.
 
System: Guix System on x86_64
Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
 
--
Uli
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<!doctype html>
<html>
 <head> 
  <meta charset="UTF-8"> 
 </head>
 <body>
  <div class="default-style">
   I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
  </div> 
  <div class="default-style">
   After logging out and in a few times, there are multiple user shepherd processes.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Suspected cause:&nbsp; Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
  </div> 
  <div class="default-style">
   So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
  </div> 
  <div class="default-style">
   This seems to be a general issue and not particular to the syncthing home service.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   System: Guix System on x86_64
  </div> 
  <div class="default-style">
   Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   --
  </div> 
  <div class="default-style">
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#76998: Guix Home leaves user shepherd on logout, starts new
 instance on login
In-Reply-To: <874iyrkvx7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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To: xeji@HIDDEN
Subject: bug#67863: closed (Re: bug#76998: Guix Home leaves user shepherd
 on logout, starts new instance on login)
Message-ID: <handler.67863.D76998.174724224818497.notifdone <at> debbugs.gnu.org>
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 67863 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
Contact help-debbugs@HIDDEN with problems

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#76998: Guix Home leaves user shepherd on logout, starts new
 instance on login
In-Reply-To: <874iyrkvx7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
 
Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
After logging out and in a few times, there are multiple user shepherd processes.
 
Suspected cause:  Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
This seems to be a general issue and not particular to the syncthing home service.
 
System: Guix System on x86_64
Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
 
--
Uli
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<!doctype html>
<html>
 <head> 
  <meta charset="UTF-8"> 
 </head>
 <body>
  <div class="default-style">
   I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
  </div> 
  <div class="default-style">
   After logging out and in a few times, there are multiple user shepherd processes.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Suspected cause:&nbsp; Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
  </div> 
  <div class="default-style">
   So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
  </div> 
  <div class="default-style">
   This seems to be a general issue and not particular to the syncthing home service.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   System: Guix System on x86_64
  </div> 
  <div class="default-style">
   Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   --
  </div> 
  <div class="default-style">
   Uli
  </div>
 </body>
</html>
------=_Part_70406_842581498.1702766524279--



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Your message dated Wed, 14 May 2025 18:06:11 +0200
with message-id <87tt5nyy6k.fsf_-_@HIDDEN>
and subject line Re: bug#76998: Guix Home leaves user shepherd on logout, s=
tarts new instance on login
has caused the debbugs.gnu.org bug report #76998,
regarding Guix Home leaves user shepherd on logout, starts new instance on =
login
to be marked as done.

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76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
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Subject: Shepherd: Growing number of user shepherds when relogging
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Hi

I think I'm experiencing a bug in Shepherd since version 1.0.
Whenever I log out and log back in again, my user shepherd from the
previous login session is still present, and a new user shepherd spawns for
the current login session.
So relogging N times results in N+1 user shepherds.

For example, I have relogged 5 times since I last rebooted:

$ herd status root
Status of root:
  It is running since 00:30:02 (10 minutes ago).
  Main PID: 23450
  Command:
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
...

$ pgrep shepherd
1
9891
10777
16417
18510
21960
23450

$  ps aux | grep shepherd
root         1  0.0  0.9 222872 74456 ?        Sl   Dec15   0:08
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf
jake      9891  0.0  0.2  75816 23624 ?        Ss   Dec15   0:04
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     10777  0.0  0.3  76224 24752 ?        Ss   Dec16   0:03
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     16417  0.0  0.3  75752 24004 ?        Ss   Dec16   0:02
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     18510  0.0  0.2  75752 23760 ?        Ss   Dec16   0:01
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     21960  0.0  0.2 114608 22124 ?        Ss   Dec16   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23450  0.0  0.2 114204 21328 ?        Ss   00:30   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23672  0.0  0.0   6636  2552 pts/1    S+   00:32   0:00 grep
--color=auto shepherd

In addition, any daemons managed by the zombie shepherds also persist!

I'm experiencing this on both of my Guix System machines. One is running
GDM and XFCE. The other is running GDM and CWM.
Please let me know if I can provide more information.

Thanks
Jake

--000000000000d38909062963ec7d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi</div><div><br></div><div>I think I&#39;m experienc=
ing a bug in Shepherd since version 1.0.=C2=A0</div><div>Whenever I log out=
 and log back in again, my user shepherd from the previous login session is=
 still present, and a new user shepherd spawns for the current login sessio=
n.</div><div>So relogging N times results in N+1 user shepherds.</div><div>=
<br></div><div>For example, I have relogged 5 times since I last rebooted:<=
/div><div><br></div><div>$ herd status root</div><div style=3D"margin-left:=
40px">Status of root:<br>=C2=A0 It is running since 00:30:02 (10 minutes ag=
o).<br>=C2=A0 Main PID: 23450<br>=C2=A0 Command: /gnu/store/mfkz7fvlfpv3ppw=
bkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c=
7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /g=
nu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf</div><div style=3D"=
margin-left:40px">...</div><div><br></div><div>$ pgrep shepherd<br></div><d=
iv style=3D"margin-left:40px">1</div><div style=3D"margin-left:40px">9891<b=
r>10777<br>16417<br>18510<br>21960<br></div><div style=3D"margin-left:40px"=
>23450</div><div><br></div><div>$=C2=A0 ps aux | grep shepherd</div><div st=
yle=3D"margin-left:40px">root =C2=A0 =C2=A0 =C2=A0 =C2=A0 1 =C2=A00.0 =C2=
=A00.9 222872 74456 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Sl =C2=A0 Dec15 =C2=A0 0:0=
8 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf<=
br>jake =C2=A0 =C2=A0 =C2=A09891 =C2=A00.0 =C2=A00.2 =C2=A075816 23624 ? =
=C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec15 =C2=A0 0:04 /gnu/store/mfkz7fvlf=
pv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/=
nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --con=
fig /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=
=A0 =C2=A0 10777 =C2=A00.0 =C2=A00.3 =C2=A076224 24752 ? =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:03 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nr=
f95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4=
r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3=
l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 16417 =
=C2=A00.0 =C2=A00.3 =C2=A075752 24004 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=
=A0 Dec16 =C2=A0 0:02 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0=
.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-=
shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815mm3qzx7=
7xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 18510 =C2=A00.0 =C2=A00.=
2 =C2=A075752 23760 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:0=
1 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-sheph=
erd.conf<br>jake =C2=A0 =C2=A0 21960 =C2=A00.0 =C2=A00.2 114608 22124 ? =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3=
ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0=
w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config=
 /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =
=C2=A0 23450 =C2=A00.0 =C2=A00.2 114204 21328 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0=
Ss =C2=A0 00:30 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-gui=
le-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7n=
d5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815m=
m3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 23672 =C2=A00.0 =
=C2=A00.0 =C2=A0 6636 =C2=A02552 pts/1 =C2=A0 =C2=A0S+ =C2=A0 00:32 =C2=A0 =
0:00 grep --color=3Dauto shepherd<br></div><div><br></div><div>In addition,=
 any daemons managed by the zombie shepherds also persist!</div><div><br></=
div><div>I&#39;m experiencing this on both of my Guix System machines. One =
is running GDM and XFCE. The other is running GDM and CWM.=C2=A0</div><div>=
Please let me know if I can provide more information.</div><div><br></div><=
div>Thanks<br></div><div>Jake <br></div></div>

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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: Re: bug#76998: Guix Home leaves user shepherd on logout, starts new
 instance on login
In-Reply-To: <874iyrkvx7.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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To: Jake <jforst.mailman@HIDDEN>
Subject: bug#74912: closed (Re: bug#76998: Guix Home leaves user shepherd
 on logout, starts new instance on login)
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74912 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> So shepherd will now refuse to start when it determines that an instance
> is already listening on its socket:
>
>   https://git.savannah.gnu.org/cgit/shepherd.git/commit/?id=3D787d5a33aea=
061b5052faa0863c96be722440ce3

This commit is in 1.0.4.  Closing!

Ludo=E2=80=99.


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Subject: Shepherd: Growing number of user shepherds when relogging
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Hi

I think I'm experiencing a bug in Shepherd since version 1.0.
Whenever I log out and log back in again, my user shepherd from the
previous login session is still present, and a new user shepherd spawns for
the current login session.
So relogging N times results in N+1 user shepherds.

For example, I have relogged 5 times since I last rebooted:

$ herd status root
Status of root:
  It is running since 00:30:02 (10 minutes ago).
  Main PID: 23450
  Command:
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
...

$ pgrep shepherd
1
9891
10777
16417
18510
21960
23450

$  ps aux | grep shepherd
root         1  0.0  0.9 222872 74456 ?        Sl   Dec15   0:08
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf
jake      9891  0.0  0.2  75816 23624 ?        Ss   Dec15   0:04
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     10777  0.0  0.3  76224 24752 ?        Ss   Dec16   0:03
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     16417  0.0  0.3  75752 24004 ?        Ss   Dec16   0:02
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     18510  0.0  0.2  75752 23760 ?        Ss   Dec16   0:01
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     21960  0.0  0.2 114608 22124 ?        Ss   Dec16   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23450  0.0  0.2 114204 21328 ?        Ss   00:30   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23672  0.0  0.0   6636  2552 pts/1    S+   00:32   0:00 grep
--color=auto shepherd

In addition, any daemons managed by the zombie shepherds also persist!

I'm experiencing this on both of my Guix System machines. One is running
GDM and XFCE. The other is running GDM and CWM.
Please let me know if I can provide more information.

Thanks
Jake

--000000000000d38909062963ec7d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi</div><div><br></div><div>I think I&#39;m experienc=
ing a bug in Shepherd since version 1.0.=C2=A0</div><div>Whenever I log out=
 and log back in again, my user shepherd from the previous login session is=
 still present, and a new user shepherd spawns for the current login sessio=
n.</div><div>So relogging N times results in N+1 user shepherds.</div><div>=
<br></div><div>For example, I have relogged 5 times since I last rebooted:<=
/div><div><br></div><div>$ herd status root</div><div style=3D"margin-left:=
40px">Status of root:<br>=C2=A0 It is running since 00:30:02 (10 minutes ag=
o).<br>=C2=A0 Main PID: 23450<br>=C2=A0 Command: /gnu/store/mfkz7fvlfpv3ppw=
bkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c=
7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /g=
nu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf</div><div style=3D"=
margin-left:40px">...</div><div><br></div><div>$ pgrep shepherd<br></div><d=
iv style=3D"margin-left:40px">1</div><div style=3D"margin-left:40px">9891<b=
r>10777<br>16417<br>18510<br>21960<br></div><div style=3D"margin-left:40px"=
>23450</div><div><br></div><div>$=C2=A0 ps aux | grep shepherd</div><div st=
yle=3D"margin-left:40px">root =C2=A0 =C2=A0 =C2=A0 =C2=A0 1 =C2=A00.0 =C2=
=A00.9 222872 74456 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Sl =C2=A0 Dec15 =C2=A0 0:0=
8 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf<=
br>jake =C2=A0 =C2=A0 =C2=A09891 =C2=A00.0 =C2=A00.2 =C2=A075816 23624 ? =
=C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec15 =C2=A0 0:04 /gnu/store/mfkz7fvlf=
pv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/=
nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --con=
fig /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=
=A0 =C2=A0 10777 =C2=A00.0 =C2=A00.3 =C2=A076224 24752 ? =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:03 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nr=
f95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4=
r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3=
l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 16417 =
=C2=A00.0 =C2=A00.3 =C2=A075752 24004 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=
=A0 Dec16 =C2=A0 0:02 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0=
.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-=
shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815mm3qzx7=
7xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 18510 =C2=A00.0 =C2=A00.=
2 =C2=A075752 23760 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:0=
1 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-sheph=
erd.conf<br>jake =C2=A0 =C2=A0 21960 =C2=A00.0 =C2=A00.2 114608 22124 ? =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3=
ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0=
w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config=
 /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =
=C2=A0 23450 =C2=A00.0 =C2=A00.2 114204 21328 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0=
Ss =C2=A0 00:30 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-gui=
le-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7n=
d5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815m=
m3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 23672 =C2=A00.0 =
=C2=A00.0 =C2=A0 6636 =C2=A02552 pts/1 =C2=A0 =C2=A0S+ =C2=A0 00:32 =C2=A0 =
0:00 grep --color=3Dauto shepherd<br></div><div><br></div><div>In addition,=
 any daemons managed by the zombie shepherds also persist!</div><div><br></=
div><div>I&#39;m experiencing this on both of my Guix System machines. One =
is running GDM and XFCE. The other is running GDM and CWM.=C2=A0</div><div>=
Please let me know if I can provide more information.</div><div><br></div><=
div>Thanks<br></div><div>Jake <br></div></div>

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From: Danny Milosavljevic <dannym@HIDDEN>
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Danny Milosavljevic <dannym@HIDDEN>
Subject: bug#76998: closed (Guix Home leaves user shepherd on logout,
 starts new instance on login)
CC: tracker <at> debbugs.gnu.org
Message-ID: <handler.76998.D76998.174757146311641.ackdone <at> debbugs.gnu.org>
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Date: Sun, 18 May 2025 12:32:03 +0000
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Your message dated Sun, 18 May 2025 14:30:49 +0200
with message-id <87bjrqt81y.fsf@HIDDEN>
and subject line Re: bug#74912: bug#76998: Guix Home leaves user shepherd o=
n logout, starts new instance on login
has caused the debbugs.gnu.org bug report #76998,
regarding Guix Home leaves user shepherd on logout, starts new instance on =
login
to be marked as done.

(If you believe you have received this mail in error, please contact
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From: dannym@HIDDEN
To: Bug Guix <bug-guix@HIDDEN>
Subject: user shepherd stays around with some zombies
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Steps to reproduce:

1. Log into the console using your regular user
2. Log into GUI using your regular user
3. Log out of GUI
4. Switch to logged-in console
5. Run "px --tree" there
6. Observe the following:

shepherd(1)
   accounts-daemon(1110)
   avahi-daemon:(2443)
     avahi-daemon:(2446)
   bluetoothd(1026)
   colord(25587)
   cupsd(2440)
   dbus-daemon(769)
   dnsmasq(1845)
     dnsmasq(1846)
   earlyoom(744)
   elogind(1024)
   gdm(1038)
   guix-daemon(740)
   libvirtd(1023)
   login(26536)
     -bash(6739)
   mcron(747)
   mingetty... (5×)
   ModemManager(1276)
   NetworkManager(1256)
   nginx:(797)
     nginx:(798)
   nscd(2177)
   polkitd(1231)
   postgres(852)
     postgres:... (6×)
   rasdaemon(796)
   rpc.idmapd(2447)
   rpc.mountd(2501)
   rpc.statd(2444)
   rpcbind(2441)
   shepherd(6395) <--- also dannym
     [dbus-daemon](6397)
     [ssh-agent](6444)
     [xdg-permission-](6411)
     wireplumber(6399)
   shepherd(26114) <--- dannym
     dbus-daemon(6881)
     pipewire(6882)
     pipewire-pulse(6883)
     ssh-agent(6880)
     wireplumber(6888)
     xdg-permission-store(7259)
   udevd(330)
   upowerd(1025)
   virtlogd(742)
   wpa_supplicant(1045)

Those "[...]" with brackets mean that these processes were not reaped 
(so is defunct).

What the hell?

$ guix describe
Generation 194	Mar 13 2025 19:11:33	(current)
   guix 678b3dd
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2



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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
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Content-Type: text/plain; charset=utf-8
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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: dannym@HIDDEN
Subject: bug#76998: closed (Re: bug#74912: bug#76998: Guix Home leaves
 user shepherd on logout, starts new instance on login)
Message-ID: <handler.76998.D76998.174757146311641.notifdone <at> debbugs.gnu.org>
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 76998 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
User-Agent: mu4e 1.12.9; emacs 29.4
Date: Sun, 18 May 2025 14:30:49 +0200
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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                             manager

--=-=-=
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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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Date: Thu, 13 Mar 2025 20:10:36 +0100
From: dannym@HIDDEN
To: Bug Guix <bug-guix@HIDDEN>
Subject: user shepherd stays around with some zombies
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Steps to reproduce:

1. Log into the console using your regular user
2. Log into GUI using your regular user
3. Log out of GUI
4. Switch to logged-in console
5. Run "px --tree" there
6. Observe the following:

shepherd(1)
   accounts-daemon(1110)
   avahi-daemon:(2443)
     avahi-daemon:(2446)
   bluetoothd(1026)
   colord(25587)
   cupsd(2440)
   dbus-daemon(769)
   dnsmasq(1845)
     dnsmasq(1846)
   earlyoom(744)
   elogind(1024)
   gdm(1038)
   guix-daemon(740)
   libvirtd(1023)
   login(26536)
     -bash(6739)
   mcron(747)
   mingetty... (5×)
   ModemManager(1276)
   NetworkManager(1256)
   nginx:(797)
     nginx:(798)
   nscd(2177)
   polkitd(1231)
   postgres(852)
     postgres:... (6×)
   rasdaemon(796)
   rpc.idmapd(2447)
   rpc.mountd(2501)
   rpc.statd(2444)
   rpcbind(2441)
   shepherd(6395) <--- also dannym
     [dbus-daemon](6397)
     [ssh-agent](6444)
     [xdg-permission-](6411)
     wireplumber(6399)
   shepherd(26114) <--- dannym
     dbus-daemon(6881)
     pipewire(6882)
     pipewire-pulse(6883)
     ssh-agent(6880)
     wireplumber(6888)
     xdg-permission-store(7259)
   udevd(330)
   upowerd(1025)
   virtlogd(742)
   wpa_supplicant(1045)

Those "[...]" with brackets mean that these processes were not reaped 
(so is defunct).

What the hell?

$ guix describe
Generation 194	Mar 13 2025 19:11:33	(current)
   guix 678b3dd
     repository URL: https://git.savannah.gnu.org/git/guix.git
     branch: master
     commit: 678b3dddfe442e643fe5cff7730d4f9690c3e2c2



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To: Danny Milosavljevic <dannym@HIDDEN>
Subject: bug#67863: closed (Guix Home leaves user shepherd on logout,
 starts new instance on login)
CC: tracker <at> debbugs.gnu.org
Message-ID: <handler.67863.D76998.174757146311641.ackdone <at> debbugs.gnu.org>
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Your message dated Sun, 18 May 2025 14:30:49 +0200
with message-id <87bjrqt81y.fsf@HIDDEN>
and subject line Re: bug#74912: bug#76998: Guix Home leaves user shepherd o=
n logout, starts new instance on login
has caused the debbugs.gnu.org bug report #76998,
regarding Guix Home leaves user shepherd on logout, starts new instance on =
login
to be marked as done.

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help-debbugs@HIDDEN)


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76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
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I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
 
Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
After logging out and in a few times, there are multiple user shepherd processes.
 
Suspected cause:  Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
This seems to be a general issue and not particular to the syncthing home service.
 
System: Guix System on x86_64
Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
 
--
Uli
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<!doctype html>
<html>
 <head> 
  <meta charset="UTF-8"> 
 </head>
 <body>
  <div class="default-style">
   I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
  </div> 
  <div class="default-style">
   After logging out and in a few times, there are multiple user shepherd processes.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Suspected cause:&nbsp; Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
  </div> 
  <div class="default-style">
   So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
  </div> 
  <div class="default-style">
   This seems to be a general issue and not particular to the syncthing home service.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   System: Guix System on x86_64
  </div> 
  <div class="default-style">
   Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   --
  </div> 
  <div class="default-style">
   Uli
  </div>
 </body>
</html>
------=_Part_70406_842581498.1702766524279--



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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
User-Agent: mu4e 1.12.9; emacs 29.4
Date: Sun, 18 May 2025 14:30:49 +0200
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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                             manager

--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: xeji@HIDDEN
Subject: bug#67863: closed (Re: bug#74912: bug#76998: Guix Home leaves
 user shepherd on logout, starts new instance on login)
Message-ID: <handler.67863.D76998.174757146311641.notifdone <at> debbugs.gnu.org>
References: <87bjrqt81y.fsf@HIDDEN>
 <835991647.70407.1702766524281@HIDDEN>
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 67863 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
GNU Bug Tracking System
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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
User-Agent: mu4e 1.12.9; emacs 29.4
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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                              for more information.
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                             manager

--=-=-=
Content-Type: text/plain; charset=utf-8
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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
 
Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
After logging out and in a few times, there are multiple user shepherd processes.
 
Suspected cause:  Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
This seems to be a general issue and not particular to the syncthing home service.
 
System: Guix System on x86_64
Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
 
--
Uli
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<!doctype html>
<html>
 <head> 
  <meta charset="UTF-8"> 
 </head>
 <body>
  <div class="default-style">
   I am trying to use the awesome Guix Home Shepherd service for syncthing (home-syncthing-service-type).
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Syncthing works fine but every time I log out of my last user session and log back in again, a new instance of the user shepherd is started (and tries to start syncthing again).
  </div> 
  <div class="default-style">
   After logging out and in a few times, there are multiple user shepherd processes.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Suspected cause:&nbsp; Apparently the user shepherd process is not killed on last logout before elogind (correctly) removes XDG_RUNTIME_DIR.
  </div> 
  <div class="default-style">
   So on next login, a new empty XDG_RUNTIME_DIR is created, causing a new user shepherd to be started while the old one is still running happily.
  </div> 
  <div class="default-style">
   This seems to be a general issue and not particular to the syncthing home service.
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   System: Guix System on x86_64
  </div> 
  <div class="default-style">
   Guix commit: ac61e9705fb8c450c6cd0c1731fbb1b909c1f944
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   --
  </div> 
  <div class="default-style">
   Uli
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From: Jake <jforst.mailman@HIDDEN>
Date: Mon, 16 Dec 2024 14:23:20 +0000
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Subject: Shepherd: Growing number of user shepherds when relogging
To: bug-guix@HIDDEN
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Hi

I think I'm experiencing a bug in Shepherd since version 1.0.
Whenever I log out and log back in again, my user shepherd from the
previous login session is still present, and a new user shepherd spawns for
the current login session.
So relogging N times results in N+1 user shepherds.

For example, I have relogged 5 times since I last rebooted:

$ herd status root
Status of root:
  It is running since 00:30:02 (10 minutes ago).
  Main PID: 23450
  Command:
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
...

$ pgrep shepherd
1
9891
10777
16417
18510
21960
23450

$  ps aux | grep shepherd
root         1  0.0  0.9 222872 74456 ?        Sl   Dec15   0:08
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf
jake      9891  0.0  0.2  75816 23624 ?        Ss   Dec15   0:04
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     10777  0.0  0.3  76224 24752 ?        Ss   Dec16   0:03
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     16417  0.0  0.3  75752 24004 ?        Ss   Dec16   0:02
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     18510  0.0  0.2  75752 23760 ?        Ss   Dec16   0:01
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     21960  0.0  0.2 114608 22124 ?        Ss   Dec16   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23450  0.0  0.2 114204 21328 ?        Ss   00:30   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23672  0.0  0.0   6636  2552 pts/1    S+   00:32   0:00 grep
--color=auto shepherd

In addition, any daemons managed by the zombie shepherds also persist!

I'm experiencing this on both of my Guix System machines. One is running
GDM and XFCE. The other is running GDM and CWM.
Please let me know if I can provide more information.

Thanks
Jake

--000000000000d38909062963ec7d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi</div><div><br></div><div>I think I&#39;m experienc=
ing a bug in Shepherd since version 1.0.=C2=A0</div><div>Whenever I log out=
 and log back in again, my user shepherd from the previous login session is=
 still present, and a new user shepherd spawns for the current login sessio=
n.</div><div>So relogging N times results in N+1 user shepherds.</div><div>=
<br></div><div>For example, I have relogged 5 times since I last rebooted:<=
/div><div><br></div><div>$ herd status root</div><div style=3D"margin-left:=
40px">Status of root:<br>=C2=A0 It is running since 00:30:02 (10 minutes ag=
o).<br>=C2=A0 Main PID: 23450<br>=C2=A0 Command: /gnu/store/mfkz7fvlfpv3ppw=
bkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c=
7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /g=
nu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf</div><div style=3D"=
margin-left:40px">...</div><div><br></div><div>$ pgrep shepherd<br></div><d=
iv style=3D"margin-left:40px">1</div><div style=3D"margin-left:40px">9891<b=
r>10777<br>16417<br>18510<br>21960<br></div><div style=3D"margin-left:40px"=
>23450</div><div><br></div><div>$=C2=A0 ps aux | grep shepherd</div><div st=
yle=3D"margin-left:40px">root =C2=A0 =C2=A0 =C2=A0 =C2=A0 1 =C2=A00.0 =C2=
=A00.9 222872 74456 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Sl =C2=A0 Dec15 =C2=A0 0:0=
8 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf<=
br>jake =C2=A0 =C2=A0 =C2=A09891 =C2=A00.0 =C2=A00.2 =C2=A075816 23624 ? =
=C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec15 =C2=A0 0:04 /gnu/store/mfkz7fvlf=
pv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/=
nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --con=
fig /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=
=A0 =C2=A0 10777 =C2=A00.0 =C2=A00.3 =C2=A076224 24752 ? =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:03 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nr=
f95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4=
r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3=
l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 16417 =
=C2=A00.0 =C2=A00.3 =C2=A075752 24004 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=
=A0 Dec16 =C2=A0 0:02 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0=
.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-=
shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815mm3qzx7=
7xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 18510 =C2=A00.0 =C2=A00.=
2 =C2=A075752 23760 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:0=
1 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-sheph=
erd.conf<br>jake =C2=A0 =C2=A0 21960 =C2=A00.0 =C2=A00.2 114608 22124 ? =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3=
ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0=
w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config=
 /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =
=C2=A0 23450 =C2=A00.0 =C2=A00.2 114204 21328 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0=
Ss =C2=A0 00:30 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-gui=
le-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7n=
d5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815m=
m3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 23672 =C2=A00.0 =
=C2=A00.0 =C2=A0 6636 =C2=A02552 pts/1 =C2=A0 =C2=A0S+ =C2=A0 00:32 =C2=A0 =
0:00 grep --color=3Dauto shepherd<br></div><div><br></div><div>In addition,=
 any daemons managed by the zombie shepherds also persist!</div><div><br></=
div><div>I&#39;m experiencing this on both of my Guix System machines. One =
is running GDM and XFCE. The other is running GDM and CWM.=C2=A0</div><div>=
Please let me know if I can provide more information.</div><div><br></div><=
div>Thanks<br></div><div>Jake <br></div></div>

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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
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Date: Sun, 18 May 2025 14:30:49 +0200
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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To: Jake <jforst.mailman@HIDDEN>
Subject: bug#74912: closed (Re: bug#74912: bug#76998: Guix Home leaves
 user shepherd on logout, starts new instance on login)
Message-ID: <handler.74912.D76998.174757146311641.notifdone <at> debbugs.gnu.org>
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Your bug report

#76998: Guix Home leaves user shepherd on logout, starts new instance on lo=
gin

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 74912 <at> debbugs.gnu.org.

--=20
76998: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76998
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From: Danny Milosavljevic <dannym@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#74912: bug#76998: Guix Home leaves user shepherd on logout,
 starts new instance on login
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
 good that the "is a shepherd already running" check is back in shepherd.
 It was in shepherd years ago, then got removed without explanation, then now
 it's back again (now in a very convoluted but [...] 
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 Content preview:  Hi Ludo, That is not a fix. It's a workaround for now. It's
    good that the "is a shepherd already running" check is back in shepherd.
   It was in shepherd years ago, then got removed without explanation, then now
    it's back again (now in a very convoluted but [...] 
 
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                             manager

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Hi Ludo,

That is not a fix.  It's a workaround for now.

It's good that the "is a shepherd already running" check is back in shepher=
d.  It was in shepherd years ago, then got removed without explanation, the=
n now it's back again (now in a very convoluted but safer way).  This shoul=
dn't have been removed in the first place.  It's EXTREMELY dangerous to hav=
e multiple parallel shepherds for the same user (automated backup service d=
estroying backups etc).  Please, let's not remove it ever again.

In any case, what shepherd 1.0.4 does is stop the bleeding, but not fix the=
 problem:
It prevents two (or 100) user shepherds for the same user from running in p=
arallel.
It does not stop shepherd when a user closed all their sessions.

Why close this bug report before elogind is patched and before ~/.bash_logo=
ut is generated in guix home?  That makes no sense.

Also, I don't understand why this is so broken for so long.  Isn't Guix use=
d in HPC?
Doesn't HPC need support for multiple sessions for the same user on day one?

My untested elogind patch that invokes shepherd root stop is attached.  Rea=
ding the elogind source code, especially what they patched out and what the=
y added themselves, makes me despair.  Why is it so terrible?  That all use=
d to be fine! :P

Even my patch is not great.  A service manager's job is to manage services.=
  PID 1 is the main service manager.  It should manage services.  One of th=
ose services should be the user's shepherd, which should be managed by PID =
1 shepherd and not weirdly attached to an already-running session (WTF!) of=
 the user by this:

~$ cat ~/.profile
HOME_ENVIRONMENT=3D$HOME/.guix-home
. $HOME_ENVIRONMENT/setup-environment
$HOME_ENVIRONMENT/on-first-login
unset HOME_ENVIRONMENT

In my opinion, no one but the service manager should manage services.  Does=
 ~/.profile look like a service manager?  No :P

I understand that we want to support this on non-guix-system stuff.  But th=
e default should be a systemd user service to run the user shepherd.  If th=
e user absolutely wants to do a workaround like ~/.profile above, fine, the=
y can.  But let's not do that by default.

The problems with my elogind patch are the following:
- What if "herd stop root -s ..." hangs?  Then elogind hangs forever?  No o=
ne can log in or out anymore?=C2=A0 That's not okay.  Therefore, I don't wa=
it.  Now user processes can have the floor upon they are walking removed on=
 user stop, while they still need it :P
- When can /run/user/1000 be deleted?  There's a weird GC mechanism in elog=
ind for that, and my patch says it can be deleted before waiting on the res=
ult of herd stop (see above why).  If I DID wait on the result of herd stop=
, I could wait indefinitely--which is not okay.  I think elogind uses signa=
lfd, so I can't waitpid in a random spot either, or wait until waitpid retu=
rned.  I think the user shepherd knows when to delete /run/user/1000--and n=
o one else.  But if user shepherd crashes, it won't delete /run/user/1000 a=
nd we want it to be able to start again even when /run/user/1000 is still t=
here.  Hence complicated shepherd fix in 1.0.4 is useful.
- There is tool_fork_pid and sleep_fork_pid in elogind which is not a queue=
.  And, again, that is trying to be a service manager.  What if those scrip=
ts hang?  What if they DON'T hang?  Similar questions as before.  Separate =
the concerns already :P

Personally, I'd also like something that, if all sessions of user x are clo=
sed, it kills all remaining processes of that effective user id.  elogind h=
as a setting KillUserProcesses that--despite the name--kills (WHICH!?) proc=
esses when a SESSION (of 42 sessions of that user :P) is closed.  Who wants=
 THAT?  And even if someone does: how would THAT be implemented?

elogind is like containers never happened.  It's so weird.

I think to fix this problem for good, first there needs to be a system diag=
ram created on how this is supposed to work.


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment; filename=ELOGIND.patch
Content-Description: elogind patch for shepherd

License: elogind's license
Author: Danny Milosavljevic <dannym@HIDDEN>
Date: 2025-05-18

diff -ru orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c
--- orig/18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 13:54:28.999814332 +0200
+++ 18rk21n7l3yniy1rvlcdnwgnnvafivf0-elogind-255.17-checkout/src/login/logind-user.c	2025-05-10 15:48:33.872775240 +0200
@@ -2,6 +2,7 @@
 
 #include <errno.h>
 #include <unistd.h>
+#include <spawn.h>
 
 #include "alloc-util.h"
 //#include "bus-common-errors.h"
@@ -17,6 +18,7 @@
 #include "format-util.h"
 #include "fs-util.h"
 #include "hashmap.h"
+#include "string-util.h"
 // #include "label-util.h"
 #include "limits-util.h"
 #include "logind-dbus.h"
@@ -506,24 +508,45 @@
         return 0;
 }
 
-#if 0 /// elogind does not support user services and systemd units
 static void user_stop_service(User *u, bool force) {
-        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
-        int r;
-
-        assert(u);
-        assert(u->service);
-
-        /* The reverse of user_start_service(). Note that we only stop user@HIDDEN here, and let StopWhenUnneeded=
-         * deal with the slice and the user-runtime-dir@.service instance. */
-
-        u->service_job = mfree(u->service_job);
-
-        r = manager_stop_unit(u->manager, u->service, force ? "replace" : "fail", &error, &u->service_job);
-        if (r < 0)
-                log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
+	assert(u);
+	if (u->runtime_path != NULL) {
+		pid_t pid;
+		/* TODO: maybe just /run/booted-system/profile/bin/pkill -u u->user_record->uid ;
+		TODO: maybe just loginctl kill-user x; maybe that's us.
+		That eventually calls user_kill, which elogind patched to not kill the user
+		service or, really, do anything useful.
+		u->slice would be the unit name if it worked.
+		Note: u->user_record->kill_processes is for sessions, not users.
+		See also user_unit_active. */
+		const char *executable = "/run/booted-system/profile/bin/herd";
+		char* socket_path_arg = strjoina(u->runtime_path, "/shepherd/socket");
+		char *argv[] = {
+			(char *) executable,
+			"stop",
+			"root",
+			"-s",
+			socket_path_arg,
+			NULL,
+		};
+		int spawn_status = posix_spawn(&pid, executable, NULL, NULL, argv, environ);
+		if (spawn_status != 0) {
+			log_error_errno(spawn_status, "Failed to invoke %s: %m", executable);
+		} else {
+			if (u->manager != NULL) {
+				/* TODO: Do we overwrite someone here? */
+				u->manager->tool_fork_pid = pid;
+				/* elogind_sigchld_handler unsets it.  Not sure how we'd notice.
+				Note: elogind patched out the service_job handling which means
+				that user_may_gc will return true as soon as u->stopping == true
+				instead of checking whether the user service is still running. */
+			} else {
+				/* ??? */
+			}
+		}
+	}
+	user_add_to_gc_queue(u);
 }
-#endif // 0
 
 int user_stop(User *u, bool force) {
         int r = 0;
@@ -552,11 +575,7 @@
                         r = k;
         }
 
-#if 0 /// elogind does not support service or slice jobs...
         user_stop_service(u, force);
-#else // 0
-        user_add_to_gc_queue(u);
-#endif // 0
 
         u->stopping = true;
 

--=-=-=--


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Subject: Shepherd: Growing number of user shepherds when relogging
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--000000000000d38909062963ec7d
Content-Type: text/plain; charset="UTF-8"

Hi

I think I'm experiencing a bug in Shepherd since version 1.0.
Whenever I log out and log back in again, my user shepherd from the
previous login session is still present, and a new user shepherd spawns for
the current login session.
So relogging N times results in N+1 user shepherds.

For example, I have relogged 5 times since I last rebooted:

$ herd status root
Status of root:
  It is running since 00:30:02 (10 minutes ago).
  Main PID: 23450
  Command:
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
...

$ pgrep shepherd
1
9891
10777
16417
18510
21960
23450

$  ps aux | grep shepherd
root         1  0.0  0.9 222872 74456 ?        Sl   Dec15   0:08
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf
jake      9891  0.0  0.2  75816 23624 ?        Ss   Dec15   0:04
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     10777  0.0  0.3  76224 24752 ?        Ss   Dec16   0:03
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     16417  0.0  0.3  75752 24004 ?        Ss   Dec16   0:02
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     18510  0.0  0.2  75752 23760 ?        Ss   Dec16   0:01
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     21960  0.0  0.2 114608 22124 ?        Ss   Dec16   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23450  0.0  0.2 114204 21328 ?        Ss   00:30   0:00
/gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile
--no-auto-compile
/gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd
--silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf
jake     23672  0.0  0.0   6636  2552 pts/1    S+   00:32   0:00 grep
--color=auto shepherd

In addition, any daemons managed by the zombie shepherds also persist!

I'm experiencing this on both of my Guix System machines. One is running
GDM and XFCE. The other is running GDM and CWM.
Please let me know if I can provide more information.

Thanks
Jake

--000000000000d38909062963ec7d
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<div dir=3D"ltr"><div>Hi</div><div><br></div><div>I think I&#39;m experienc=
ing a bug in Shepherd since version 1.0.=C2=A0</div><div>Whenever I log out=
 and log back in again, my user shepherd from the previous login session is=
 still present, and a new user shepherd spawns for the current login sessio=
n.</div><div>So relogging N times results in N+1 user shepherds.</div><div>=
<br></div><div>For example, I have relogged 5 times since I last rebooted:<=
/div><div><br></div><div>$ herd status root</div><div style=3D"margin-left:=
40px">Status of root:<br>=C2=A0 It is running since 00:30:02 (10 minutes ag=
o).<br>=C2=A0 Main PID: 23450<br>=C2=A0 Command: /gnu/store/mfkz7fvlfpv3ppw=
bkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c=
7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /g=
nu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf</div><div style=3D"=
margin-left:40px">...</div><div><br></div><div>$ pgrep shepherd<br></div><d=
iv style=3D"margin-left:40px">1</div><div style=3D"margin-left:40px">9891<b=
r>10777<br>16417<br>18510<br>21960<br></div><div style=3D"margin-left:40px"=
>23450</div><div><br></div><div>$=C2=A0 ps aux | grep shepherd</div><div st=
yle=3D"margin-left:40px">root =C2=A0 =C2=A0 =C2=A0 =C2=A0 1 =C2=A00.0 =C2=
=A00.9 222872 74456 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Sl =C2=A0 Dec15 =C2=A0 0:0=
8 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --config /gnu/store/p7al8wd1inwk8f5di2q4llcpd64mjn5q-shepherd.conf<=
br>jake =C2=A0 =C2=A0 =C2=A09891 =C2=A00.0 =C2=A00.2 =C2=A075816 23624 ? =
=C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec15 =C2=A0 0:04 /gnu/store/mfkz7fvlf=
pv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/=
nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --con=
fig /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=
=A0 =C2=A0 10777 =C2=A00.0 =C2=A00.3 =C2=A076224 24752 ? =C2=A0 =C2=A0 =C2=
=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:03 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nr=
f95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4=
r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3=
l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 16417 =
=C2=A00.0 =C2=A00.3 =C2=A075752 24004 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=
=A0 Dec16 =C2=A0 0:02 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0=
.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-=
shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815mm3qzx7=
7xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 18510 =C2=A00.0 =C2=A00.=
2 =C2=A075752 23760 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:0=
1 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-au=
to-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/s=
hepherd --silent --config /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-sheph=
erd.conf<br>jake =C2=A0 =C2=A0 21960 =C2=A00.0 =C2=A00.2 114608 22124 ? =C2=
=A0 =C2=A0 =C2=A0 =C2=A0Ss =C2=A0 Dec16 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3=
ppwbkv0imb19nrf95akf-guile-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0=
w5c7pxxdczqiv4r9iq44al7nd5y5g-shepherd-1.0.0/bin/shepherd --silent --config=
 /gnu/store/w3l6dmap815mm3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =
=C2=A0 23450 =C2=A00.0 =C2=A00.2 114204 21328 ? =C2=A0 =C2=A0 =C2=A0 =C2=A0=
Ss =C2=A0 00:30 =C2=A0 0:00 /gnu/store/mfkz7fvlfpv3ppwbkv0imb19nrf95akf-gui=
le-3.0.9/bin/guile --no-auto-compile /gnu/store/nl0w5c7pxxdczqiv4r9iq44al7n=
d5y5g-shepherd-1.0.0/bin/shepherd --silent --config /gnu/store/w3l6dmap815m=
m3qzx77xdazky853adda-shepherd.conf<br>jake =C2=A0 =C2=A0 23672 =C2=A00.0 =
=C2=A00.0 =C2=A0 6636 =C2=A02552 pts/1 =C2=A0 =C2=A0S+ =C2=A0 00:32 =C2=A0 =
0:00 grep --color=3Dauto shepherd<br></div><div><br></div><div>In addition,=
 any daemons managed by the zombie shepherds also persist!</div><div><br></=
div><div>I&#39;m experiencing this on both of my Guix System machines. One =
is running GDM and XFCE. The other is running GDM and CWM.=C2=A0</div><div>=
Please let me know if I can provide more information.</div><div><br></div><=
div>Thanks<br></div><div>Jake <br></div></div>

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Last modified: Sun, 18 May 2025 12:45:02 UTC

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.