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------=_Part_327297_1022314884.1692786160357
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Hello,
 
when using the home-mcron-service, PATH is set to /run/current-system/profile/bin . This directory is empty when using guix home on a foreign distro, meaning all executable paths would need to be absolute. This includes stuff like /usr/bin/ssh, /usr/bin/nice etc..
 
My guess for the culprit was 1c30d5a6bfc5d48137f4bdcc271189a06fdc6ed3 , which replaced the custom home-mcron-service-type with mapping it to mcron-service-type. 
The mcron shepherd service in old service type did not mess with the environment variables, the inherited one does:
#:environment-variables
(cons* "GUILE_AUTO_COMPILE=0"
"PATH=/run/current-system/profile/bin"
(remove (cut string-prefix? "PATH=" <>)
(environ)))
 
Strange thing is that the commit is from 2023-08-06, and I update guix almost every day, but did not run into the issue until today. But the commit seems to fit the issue perfectly, so I'm not sure what's going on at all.
------=_Part_327297_1022314884.1692786160357
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<!doctype html>
<html>
 <head> 
  <meta charset="UTF-8"> 
 </head>
 <body>
  <div class="default-style">
   Hello,
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   when using the home-mcron-service, PATH is set to /run/current-system/profile/bin . This directory is empty when using guix home on a foreign distro, meaning all executable paths would need to be absolute. This includes stuff like /usr/bin/ssh, /usr/bin/nice etc..
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   My guess for the culprit was 1c30d5a6bfc5d48137f4bdcc271189a06fdc6ed3 , which replaced the custom home-mcron-service-type with mapping it to mcron-service-type.&nbsp;
  </div> 
  <div class="default-style">
   The mcron shepherd service in old service type did not mess with the environment variables, the inherited one does:
  </div> 
  <div class="default-style">
   #:environment-variables
   <br>(cons* "GUILE_AUTO_COMPILE=0"
   <br>"PATH=/run/current-system/profile/bin"
   <br>(remove (cut string-prefix? "PATH=" &lt;&gt;)
   <br>(environ)))
  </div> 
  <div class="default-style">
   &nbsp;
  </div> 
  <div class="default-style">
   Strange thing is that the commit is from 2023-08-06, and I update guix almost every day, but did not run into the issue until today. But the commit seems to fit the issue perfectly, so I'm not sure what's going on at all.
  </div>
 </body>
</html>
------=_Part_327297_1022314884.1692786160357--




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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: nils@HIDDEN
Subject: bug#65471: Acknowledgement (home mcron service overwrites PATH
 with a GuixSD-only directory)
Message-ID: <handler.65471.B.169278932321946.ack <at> debbugs.gnu.org>
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Date: Wed, 23 Aug 2023 11:16:02 +0000

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X-Loop: help-debbugs@HIDDEN
Subject: bug#65471: home mcron service overwrites PATH with a GuixSD-only directory
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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Date: Mon, 20 Nov 2023 23:10:33 +0100
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Hi,

Apologies for the delay.

nils@HIDDEN skribis:

> when using the home-mcron-service, PATH is set to /run/current-system/pro=
file/bin . This directory is empty when using guix home on a foreign distro=
, meaning all executable paths would need to be absolute. This includes stu=
ff like /usr/bin/ssh, /usr/bin/nice etc..
>=20=20
> My guess for the culprit was 1c30d5a6bfc5d48137f4bdcc271189a06fdc6ed3 , w=
hich replaced the custom home-mcron-service-type with mapping it to mcron-s=
ervice-type.=20
> The mcron shepherd service in old service type did not mess with the envi=
ronment variables, the inherited one does:
> #:environment-variables
> (cons* "GUILE_AUTO_COMPILE=3D0"
> "PATH=3D/run/current-system/profile/bin"
> (remove (cut string-prefix? "PATH=3D" <>)
> (environ)))

As a rule of thumb, I personally always provide absolute file names, as
in #~(job =E2=80=A6 #$(file-append coreutils "/bin/ls") =E2=80=A6).

I wonder what the preferred behavior would be.  Restore PATH to whatever
value it had when the user =E2=80=98shepherd=E2=80=99 process was started, =
at the
expense of making things harder to track/less reproducible?  Should we
leave it unset, possibly breaking programs that expect it to be set?
Should we set it to =E2=80=9C/run/current-system/profile/bin:/usr/bin=E2=80=
=9D or
similar?

Thanks,
Ludo=E2=80=99.




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Hi Ludovic,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
[=E2=80=A6]

> I wonder what the preferred behavior would be.  Restore PATH to whatever
> value it had when the user =E2=80=98shepherd=E2=80=99 process was started=
, at the
> expense of making things harder to track/less reproducible?  Should we
> leave it unset, possibly breaking programs that expect it to be set?
> Should we set it to =E2=80=9C/run/current-system/profile/bin:/usr/bin=E2=
=80=9D or
> similar?

1c30d5a6 was almost 3 months ago, so we could assume most of the users
are already reconfigured to this (or newer) commit and fixed their
configurations accordingly.

Because we probably cannot be sure how they fixed it, I think the best
that we could do is not to change the current behavior again and provide
a support and documentation if needed, so we don't break users
configurations again.

Also, the current behavior =E2=80=98PATH=3D/run/current-system/profile/bin=
=E2=80=99
matches with mcron started by Shepherd on a Guix System on pretty recent
commit =E2=80=98fc6bdaad57bf91609849623c5f485403c030cb49=E2=80=99, which pr=
obably is
better than difference of PATH dependending on is it system's Shepherd
or user's Shepherd instance running.

We could allow users to control an environment of mcron, but I think it
should be:

=2D optional for both system's and user's Shepherd instances;
=2D not a default behavior, because we already switched from PATH=3D<IMPURE>
  to =E2=80=98PATH=3D/run/current-system/profile/bin=E2=80=99.


Regards,
Oleg.

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Message sent to bug-guix@HIDDEN:


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Subject: bug#65471: home mcron service overwrites PATH with a GuixSD-only directory
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From: Nils Landt <nils@HIDDEN>
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> Ludovic Court=C3=A8s <ludo@HIDDEN> hat am 20.11.2023 23:10 CET geschrieb=
en:

> nils@HIDDEN skribis:
>=20
> > when using the home-mcron-service, PATH is set to /run/current-system/p=
rofile/bin . This directory is empty when using guix home on a foreign dist=
ro, meaning all executable paths would need to be absolute. This includes s=
tuff like /usr/bin/ssh, /usr/bin/nice etc..
> > =20
> > My guess for the culprit was 1c30d5a6bfc5d48137f4bdcc271189a06fdc6ed3 ,=
 which replaced the custom home-mcron-service-type with mapping it to mcron=
-service-type.=20
> > The mcron shepherd service in old service type did not mess with the en=
vironment variables, the inherited one does:
> > #:environment-variables
> > (cons* "GUILE_AUTO_COMPILE=3D0"
> > "PATH=3D/run/current-system/profile/bin"
> > (remove (cut string-prefix? "PATH=3D" <>)
> > (environ)))
>=20
> As a rule of thumb, I personally always provide absolute file names, as
> in #~(job =E2=80=A6 #$(file-append coreutils "/bin/ls") =E2=80=A6).

I do the same, but occasionally a program I call expects something to be av=
ailable in PATH. For me (guix home in Debian 12), this includes Guix itself=
.
Running=20
/home/nl/.config/guix/current/bin/guix pull=20
in a terminal works perfectly fine, but
unset PATH
/home/nl/.config/guix/current/bin/guix pull=20
results in a stacktrace that ends in:
In guix/scripts/pull.scm:
    453:4  4 (_)
In guix/build/utils.scm:
    625:6  3 (which "guix")
In unknown file:
           2 (string-tokenize #f #<charset {#\nul..#\9 #\;..#\15377=E2=80=
=A6> =E2=80=A6)
In ice-9/boot-9.scm:
  1685:16  1 (raise-exception _ #:continuable? _)
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
In procedure string-tokenize: Wrong type argument in position 1 (expecting =
string): #f

> I wonder what the preferred behavior would be.  Restore PATH to whatever
> value it had when the user =E2=80=98shepherd=E2=80=99 process was started=
, at the
> expense of making things harder to track/less reproducible?  Should we
> leave it unset, possibly breaking programs that expect it to be set?
> Should we set it to =E2=80=9C/run/current-system/profile/bin:/usr/bin=E2=
=80=9D or
> similar?

I think the previous behaviour was fine for a user level service. I'm guess=
ing this was inheriting the environment variables from the shepherd process=
 that started mcron?

Otherwise, adding /usr/local/bin:/usr/bin:/bin should be a good default I t=
hink.

I'm not emotionally invested either way, I have moved away from shepherd / =
mcron.




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Hi,

I've just experienced the problem first hand:
https://lists.gnu.org/archive/html/help-guix/2024-01/msg00091.html

Nils suggested to set the `PATH` environment variable, but 1) I have no
clue how to do that =F0=9F=98=85 and 2) it is not exactly the behaviour I w=
ould
expect from a home service.

Has anything been decided?

Regards,

--=20
Tanguy





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