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Subject: bug#68255: 28.2; Can't connect to emacs daemon after logging out and back in.
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 Content preview: 1. Configure your session manager not to kill leftover user
 processes after logging out. If you're using elogind, this can be done by
 editing /etc/elogind/logind.conf and setting KillUserProcesses=no. [...] 
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1. Configure your session manager not to kill leftover user processes
   after logging out. If you're using elogind, this can be done by
   editing /etc/elogind/logind.conf and setting KillUserProcesses=no.
   Same process for systemd-logind, except the file is located
   at /etc/systemd/logind.conf.
2. Log into a new session and run "emacs --daemon".
3. Log out of all sessions for that user. This causes the directory
   named in $XDG_RUNTIME_DIR to be deleted, and with it, the Emacs
   daemon's socket.
4. Log back in.
5. Observe that the emacs daemon's process is still there, and that
   its socket is gone.

Working around this problem is difficult because the XDG_RUNTIME_DIR
variable whose use causes this problem is referenced in two places:

1. The "server-socket-dir" variable in Elisp. This is fairly easy to
   change because Emacs can take you right to the definition.
2. The emacsclient binary. Changing the behavior here requires
   editing emacsclient.c, recompiling, and installing the resulting
   binary. Except it's too hard to get Emacs to build on modern
   Linux distros, so I hex-edited the emacsclient binary instead,
   NUL-ing out all strings containing "XDG_RUNTIME_DIR".

In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.37,
cairo version 1.16.0)
 of 2023-05-13, modified by Debian built on x86-ubc-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Devuan GNU/Linux 5 (daedalus)

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/libexec
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-libsystemd --with-pop=yes
 --enable-locallisppath=/etc/emacs:/usr/local/share/emacs/28.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/28.2/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils
 --with-native-compilation --with-cairo --with-x=yes
 --with-x-toolkit=gtk3 --with-toolkit-scroll-bars 'CFLAGS=-g -O2
 -ffile-prefix-map=/build/emacs-mPr7Vr/emacs-28.2+1=. -fstack-protector-strong
 -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
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Configured features:
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JSON LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES
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Important settings:
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  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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Load-path shadows:
/usr/share/emacs/site-lisp/elpa/slime-2.27/slime-tests hides
/usr/share/emacs/site-lisp/elpa-src/slime-2.27/slime-tests
/usr/share/emacs/site-lisp/elpa/slime-2.27/slime hides
/usr/share/emacs/site-lisp/elpa-src/slime-2.27/slime
/usr/share/emacs/site-lisp/elpa/slime-2.27/slime-pkg hides
/usr/share/emacs/site-lisp/elpa-src/slime-2.27/slime-pkg
/usr/share/emacs/site-lisp/elpa/slime-2.27/slime-autoloads hides
/usr/share/emacs/site-lisp/elpa-src/slime-2.27/slime-autoloads
/home/jlp/.emacs.d/elpa/transient-20200107.2156/transient hides
/usr/share/emacs/28.2/lisp/transient

Features:
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rfc822 mml mml-sec epa epg rfc6068 epg-config gnus-util rmail
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inotify lcms2 dynamic-setting system-font-setting font-render-setting
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native-compile emacs)

Memory information:
((conses 16 480397 22320)
 (symbols 48 28109 1)
 (strings 32 128262 12974)
 (string-bytes 1 4201587)
 (vectors 16 44072)
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Jeremy Phelps <jeremyphelps077@HIDDEN>
Subject: bug#68255: Acknowledgement (28.2; Can't connect to emacs daemon
 after logging out and back in.)
Message-ID: <handler.68255.B.17044438842033.ack <at> debbugs.gnu.org>
References: <CA+-17hVu9_kOZi=gRm+WuuTQwZ1tTSA5GoEoPhZ4FB8mCM9Qtw@HIDDEN>
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Date: Fri, 05 Jan 2024 08:39:02 +0000

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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#68255: 28.2; Can't connect to emacs daemon after logging out and back in.
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Jeremy Phelps <jeremyphelps077@HIDDEN>
Cc: 68255 <at> debbugs.gnu.org
Date: Fri, 05 Jan 2024 13:47:46 +0200
Message-Id: <83zfxkuhlp.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <CA+-17hVu9_kOZi=gRm+WuuTQwZ1tTSA5GoEoPhZ4FB8mCM9Qtw@HIDDEN>
 (message from Jeremy Phelps on Thu, 4 Jan 2024 14:52:17 -0500)
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> From: Jeremy Phelps <jeremyphelps077@HIDDEN>
> Date: Thu, 4 Jan 2024 14:52:17 -0500
> 
> 1. Configure your session manager not to kill leftover user processes
>    after logging out. If you're using elogind, this can be done by
>    editing /etc/elogind/logind.conf and setting KillUserProcesses=no.
>    Same process for systemd-logind, except the file is located
>    at /etc/systemd/logind.conf.
> 2. Log into a new session and run "emacs --daemon".
> 3. Log out of all sessions for that user. This causes the directory
>    named in $XDG_RUNTIME_DIR to be deleted, and with it, the Emacs
>    daemon's socket.
> 4. Log back in.
> 5. Observe that the emacs daemon's process is still there, and that
>    its socket is gone.
> 
> Working around this problem is difficult because the XDG_RUNTIME_DIR
> variable whose use causes this problem is referenced in two places:
> 
> 1. The "server-socket-dir" variable in Elisp. This is fairly easy to
>    change because Emacs can take you right to the definition.
> 2. The emacsclient binary. Changing the behavior here requires
>    editing emacsclient.c, recompiling, and installing the resulting
>    binary. Except it's too hard to get Emacs to build on modern
>    Linux distros, so I hex-edited the emacsclient binary instead,
>    NUL-ing out all strings containing "XDG_RUNTIME_DIR".

I'm not sure I understand why you cannot successfully use the daemon
in the situation you described.  Basically, what your scenario means
is that XDG_RUNTIME_DIR cannot be trusted because it is ephemeral, so
you need to tell Emacs and emacsclient to use a directory for a socket
in a way that doesn't use XDG_RUNTIME_DIR.  Is that correct?

If the above analysis is correct, then you can customize 'server-name'
to be an absolute file name of the directory where you want the socket
to be created, and invoke emacsclient with the --socket-name=NAME
option (or set EMACS_SOCKET_NAME=NAME in the environment), where NAME
is the same directory as in the value of 'server-name' option.  Did
you try that?

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#68255: 28.2; Can't connect to emacs daemon after logging out and back in.
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Jeremy Phelps <jeremyphelps077@HIDDEN>
Cc: 68255 <at> debbugs.gnu.org
Date: Sat, 06 Jan 2024 08:54:24 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <E2A1F4CF-2AC7-4772-8398-4A64EB5B40BB@HIDDEN> (message from
 Jeremy Phelps on Fri, 5 Jan 2024 15:13:43 -0500)
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[Please use Reply All to reply, to keep the bug tracker CC'ed.]

> From: Jeremy Phelps <jeremyphelps077@HIDDEN>
> Date: Fri, 5 Jan 2024 15:13:43 -0500
> 
> > If the above analysis is correct, then you can customize 'server-name'
> > to be an absolute file name of the directory where you want the socket
> > to be created, and invoke emacsclient with the --socket-name=NAME
> > option (or set EMACS_SOCKET_NAME=NAME in the environment), where NAME
> > is the same directory as in the value of 'server-name' option.  Did
> > you try that?
> 
> I did not try that, and I wouldn't be able to test it without reinstalling Emacs
> to get rid of my workaround.

Well, I'd encourage you to try this, because if it works, then there
is a solution to this situation, and if it doesn't work, we need to
fix whatever prevents it from working.

> But given that XDG_RUNTIME_DIR is ephemeral, and
> the Emacs daemon assumes it is not, it makes little sense to use it. It would
> make more sense to create a directory under ~/.emacs.d if security is the
> reason for using the XDG directory instead of /tmp.

I hear you, but other people disagree.  Some don't need to leave the
Emacs daemon running when they log off, and some say (AFAIU) that the
XDG directories don't get deleted when they log off.  So we support
both methods, and the XDG support takes precedence because most users
prefer it, AFAIU.

Last modified: Sat, 20 Jan 2024 12:30:02 UTC

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