[Bug 1153224] Re: [FFE] Move to logind for session tracking

[Steve Langasek]

On Mon, Mar 11, 2013 at 09:55:48PM -0000, Scott Kitterman wrote:
> It seemed to me like the discussion on IRC today went back and forth about
> if the switch to logind and the udev transition needed to be tied together
> and if not, which was more important to do first.

This was mostly a matter of me playing catch-up with pitti, who had a much
better understanding of the interdependencies than I did and has been
aggressively pursuing this in a ppa over the past few days.

The plan we came up with was the following:

1) update systemd to a more recent upstream version (19x), as this is a
prerequisite for obsoleting ConsoleKit from the seeds. (requires an FFe for
the new upstream version)
2) rebuild the archive against libudev1, now built from systemd.
3) in parallel, fix the udev package to not build libudev0, and to drop the
hard-coded udev->libudev0 dep.
4) seed logind in place of consolekit+libpam-xdg-support, and transition
reverse-dependencies to logind.  (Requires a second FFe - and we may stop
here for 13.04, depending on available time.)
5) post-13.04, revisit the question of getting a newer udev with libkmod
support.

>  Given that this we just thought up in mid-cycle, rather than planned,

For the record, this was blueprinted a while ago (back at UDS-Q); the latest
session concerned the finer details of how to migrate to logind now that
it's available, the fact that we've had a further detailed discussion should
not be taken as an indication that this is a new thought.

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https://bugs.launchpad.net/bugs/1153224

Title:
  [FFE] Move to logind for session tracking

Status in “systemd” package in Ubuntu:
  New

Bug description:
  At the last UDS we decided to finally drop the long-abandoned
  ConsoleKit and migrate to logind:
  https://blueprints.launchpad.net/ubuntu/+spec/foundations-1303
  -consolekit-logind-migration

  I fixed current raring's logind package (from systemd source) to
  actually work standalone, so we can use it without the init bits.

  However, as some packages like gnome-session require a newer version
  than 44, I would actually like to update this to the current upstream
  version 198. A working package is in https://launchpad.net/~ubuntu-
  core-dev/+archive/logind/+packages . This involves a soname bump of
  libudev, but as the ABI didn't actually change that much, that will
  mostly be some 50 rebuilds. (Note that libudev1 works fine against the
  older udev, and vice versa). Please note that while udev has been
  merged into the systemd source, I do not propose to update udev to
  version 198 at this point. We first need to review our current changes
  and apply that to the current udev, and it is not clear whether doing
  that in raring is appropriate. So this FFE does *not* include a
  request for an updated udev, we'll continue to use the standalone
  version 175 for the time being.

  This PPA also has a number of packages which move from ConsoleKit to
  logind for session tracking. As most upstream moved to logind long
  ago, this is usually very trivial: Add libsystemd-logind-dev build
  dep, enable the corresponding configure option, done.

  The blueprint has an exhaustive list of reverse dependencies that
  should be migrated; there are a number of packages which talk to
  ConsoleKit's D-BUS API without a declared dependency, found by an
  archive grep.

  However, we don't need to do this in a big lockstep: logind and
  ConsoleKit work just fine side by side, so at no point during the
  transition there will be a state where a package is broken. I still
  would like to convert as much as possible (read: all packages which
  have logind support in the current raring version), and I have some
  time reserved to do this. I figure that Stephane Graber, James Hunt,
  Steve Langasek, and/or the desktop team can also give a hand with
  this.

  For the record, I run my workstation with consolekit purged since
  Friday, so that I see the missing bits (which would otherwise continue
  to use CK and thus work just fine).

  While this is quite a large change, I believe that the risk is
  relatively low. logind has been tested and used in Fedora, Arch, some
  Debian developers, and other distributions for over a year now, and
  many upstreams like NetworkManager, GNOME, upower, udisks etc. do not
  test with CK any more. In fact, GNOME 3.8 drops support for
  Consolekit, which blocks the Ubuntu GNOME remix (for raring) and
  Ubuntu itself (for raring+1) from updating to a newer GNOME.

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