Debian Bug report logs - #1004448
gnome-session: should manage session with systemd --user, if available

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Message #5 received at submit@bugs.debian.org (full text, mbox, reply):

From: Simon McVittie <smcv@debian.org>

To: Debian Bug Tracking System <submit@bugs.debian.org>

Subject: gnome-session: should manage session with systemd --user, if available

Date: Thu, 27 Jan 2022 20:23:32 +0000

Package: gnome-session
Version: 40.1.1-3
Severity: wishlist

Recent-ish upstream versions of gnome-session have been able to manage the
whole login session as a group of `systemd --user` services:
https://wiki.gnome.org/Initiatives/SystemdUser

In Debian terms, this requires libpam-systemd and dbus-user-session.

In particular, one benefit of this is that it makes gnome-shell able to
survive Xwayland crashing or being killed.

At the moment, we compile the code for this but do not enable it. It can
be enabled by hacking /usr/bin/gnome-session (or the session registration
.desktop file) to pass the --systemd option to the executable.

Alternatively, we could configure with it enabled by default.

To be nice to dbus-x11 and sysvinit users, we should make sure that
on systems lacking the prerequisites, this gracefully degrades to the
equivalent of `gnome-session --builtin` (the opposite of --systemd). I
think it already does, but haven't tried it yet.

    smcv

Message #10 received at 1004448@bugs.debian.org (full text, mbox, reply):

From: Simon McVittie <smcv@debian.org>

To: 1004448@bugs.debian.org

Subject: Re: gnome-session: should manage session with systemd --user, if available

Date: Sat, 29 Jan 2022 11:38:30 +0000

Control: found -1 40.1.1-2
Control: severity -1 normal

On Thu, 27 Jan 2022 at 20:23:36 +0000, Simon McVittie wrote:
> Recent-ish upstream versions of gnome-session have been able to manage the
> whole login session as a group of `systemd --user` services:
> https://wiki.gnome.org/Initiatives/SystemdUser

In fact gnome-session in stable already does this, and it appears
to have been disabled by mistake in testing/unstable. The patch
debian/patches/debian/Make-sure-to-pass-systemd-when-we-re-managing-the-user-se.patch
was removed about a year ago, but we're still configuring with
-Dsystemd_session=enable rather than -Dsystemd_session=default, which
means systemd --user session management is still opt-in but we're no longer
opting in.

With -Dsystemd_session=default, I believe we would now have the intended
semantics: users of dbus-user-session (the majority) get a systemd-based
session, and dbus-x11/sysvinit systems get the old code path.

    smcv

Message #17 received at 1004448-submitter@bugs.debian.org (full text, mbox, reply):

From: Simon McVittie <noreply@salsa.debian.org>

To: 1004448-submitter@bugs.debian.org

Subject: Bug#1004448 marked as pending in gnome-session

Date: Sat, 29 Jan 2022 12:33:22 +0000

Control: tag -1 pending

Hello,

Bug #1004448 in gnome-session reported by you has been fixed in the
Git repository and is awaiting an upload. You can see the commit
message below and you can check the diff of the fix at:

https://salsa.debian.org/gnome-team/gnome-session/-/commit/214e34f798cc6b7c581ea5361e5b41190f6d2731

------------------------------------------------------------------------
d/rules: Configure with systemd_session=default on Linux

Prior to version 40.1.1-2, we were configuring with
systemd_session=enable, which compiled the implementation of systemd
session management but made it opt-in; and then we patched in an override
to run gnome-session with --systemd (the new opt-in code path) on systems
with systemd --user, or with --builtin (the old code path) otherwise.

40.1.1-2 removed the patch, but did not change the build-time
configuration, so systemd mode was still opt-in but we no longer
opted in. Complete this change by switching the default to systemd mode:
on Linux systems that have dbus-user-session, we will prefer systemd
mode, and on systems that do not (such as those using sysvinit) we'll
fall back to the old code path with a warning.

The old code path will not necessarily remain supported forever, since
one of the motivations for the systemd mode was to simplify GNOME
session startup.

Closes: #1004448
------------------------------------------------------------------------

(this message was generated automatically)
-- 
Greetings

https://bugs.debian.org/1004448

Message #24 received at 1004448-close@bugs.debian.org (full text, mbox, reply):

From: Debian FTP Masters <ftpmaster@ftp-master.debian.org>

To: 1004448-close@bugs.debian.org

Subject: Bug#1004448: fixed in gnome-session 41.3-1

Date: Sat, 29 Jan 2022 19:04:09 +0000

Source: gnome-session
Source-Version: 41.3-1
Done: Simon McVittie <smcv@debian.org>

We believe that the bug you reported is fixed in the latest version of
gnome-session, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1004448@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Simon McVittie <smcv@debian.org> (supplier of updated gnome-session package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

Format: 1.8
Date: Sat, 29 Jan 2022 14:42:02 +0000
Source: gnome-session
Architecture: source
Version: 41.3-1
Distribution: unstable
Urgency: medium
Maintainer: Debian GNOME Maintainers <pkg-gnome-maintainers@lists.alioth.debian.org>
Changed-By: Simon McVittie <smcv@debian.org>
Closes: 1004448
Changes:
 gnome-session (41.3-1) unstable; urgency=medium
 .
   * Team upload
 .
   [ Jeremy Bicha ]
   * New upstream release
   * debian/rules: Drop unneeded -Wl,--as-needed
   * Build-Depend on dh-sequence-gnome instead of gnome-pkg-tools
   * Revert "Leave compatibility symlinks in /usr/lib/gnome-session".
     This was no longer needed in either gdm3 or gnome-control-center
     since before bullseye.
 .
   [ Simon McVittie ]
   * d/rules: Configure with systemd_session=default on Linux.
     On Linux systems that have dbus-user-session, we now prefer systemd
     mode, as we did in bullseye (until it was accidentally disabled in
     40.1.1-2). On systems that do not, such as those using sysvinit, we'll
     fall back to the old code path with a warning.
     The old code path will not necessarily remain supported by upstream
     forever, since one of the motivations for the systemd mode was to
     simplify GNOME session startup, but at the moment it still works.
     (Closes: #1004448)
   * Depend on default-dbus-session-bus | dbus-session-bus instead of
     dbus-x11
   * Standards-Version: 4.6.0 (no changes required)
Checksums-Sha1:
 ca1943728a41245347866192698c051e55524a33 2658 gnome-session_41.3-1.dsc
 cd0d99e1bbc4f0d0ebca52a301893e5adf95dddd 483396 gnome-session_41.3.orig.tar.xz
 4a69d6aa7df7f38238e8bc44158d32d43c5cc557 36524 gnome-session_41.3-1.debian.tar.xz
 32acbf6de4da85630cf5f7ef809570f38fbca292 14155 gnome-session_41.3-1_source.buildinfo
Checksums-Sha256:
 4b70d5a62a463f8fe9e6ec61c9bcadb3efdd4a604ba38fa460700d4e09ae18e5 2658 gnome-session_41.3-1.dsc
 ee4a229053f522624054889609335b885287cf67bbde0dc9fd882b01ec9b5b39 483396 gnome-session_41.3.orig.tar.xz
 161969e60ec1f138c5401ff6d7ecdc457becd0ae303da8c2704cacd5bbcaf93d 36524 gnome-session_41.3-1.debian.tar.xz
 5d2fc973b5362eecf9c64eed62c326a69217c0ed71a9db62b7e5807e47e2277e 14155 gnome-session_41.3-1_source.buildinfo
Files:
 fa23b04efa950d82bb261e8288e609f9 2658 gnome optional gnome-session_41.3-1.dsc
 f0ccb8a21871a7dce3c3b104fe33a31a 483396 gnome optional gnome-session_41.3.orig.tar.xz
 39db36b45ab7303bf433f1727947148d 36524 gnome optional gnome-session_41.3-1.debian.tar.xz
 082475d1d407a7b58d6bb52abdfa1fb1 14155 gnome optional gnome-session_41.3-1_source.buildinfo

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