[Bug 1153224] [NEW] [FFE] Move to logind for session tracking

[Martin Pitt]

Public bug reported:

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 a list of reverse dependencies that should be
migrated, and an archive grep has been done to find packages which talk
to ConsoleKit's D-BUS API without a declared dependency.

However, we don't need to do this in 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.

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New

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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 a list of reverse dependencies that should be
  migrated, and an archive grep has been done to find packages which
  talk to ConsoleKit's D-BUS API without a declared dependency.

  However, we don't need to do this in 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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