[Bug 1656280] Re: Support installing subordinate systemd on Ubuntu Desktop 14.04.5

[Dimitri John Ledkov]

Updated description to match the latest state of affairs.

** Description changed:

- Add support for installing subordinate systemd for snappy on Ubuntu
- Desktop 14.04.5
+ Add support for installing deputy systemd for snapd on Ubuntu Desktop
+ 14.04.5
  
- When installed, superseeds systemd-shim support functionality by:
- * Providing necessary units for power management
- * Replicating systemd-shim timedated support functionality in timedated itself (thus dropping systemd-shim dependency from timedated code)
- 
- Bugfixes to cgmanager codepath for compatibility with lxc:
- * free NULL bug fix
- * fix cg_attach for subordinate systemd
+ When installed, deputy systemd provides a subset of functionality as required for snapd:
+ * Providing necessary units for power management via systemctl
+ * Provides private socket API access (and thus systemctl as root) only, and is not present on the system D-Bus
+ * Does not conflict with systemd-shim
+ * Does not change behaviour of systemd-services nor udeb build in anyway
  
  [Impact]
  
-  * Users can install snapd without regressing Desktop support,
+  * Users can install snapd without regressing Desktop support,
  lxc/lxc1/lxd abilities.
  
  [Test Case]
  
-  * Power management works (e.g. shutdown/reboot via indicator-system)
+  * Power management works (e.g. shutdown/reboot via indicator-system and
+ via systemctl)
  
-  * Timedatectl commands report NTP status enable/disabled correctly, and
+  * Timedatectl commands report NTP status enable/disabled correctly, and
  can change it
  
-  * Can install and use snapd
+  * Can install and use snapd
  
-  * Can install and use lxc / lxc1 / lxd
+  * Can install and use lxc / lxc1 / lxd
  
  [Regression Potential]
  
-  * Installing snapd will pull in cgmanager and bin:systemd on the
- desktop, superseding systemd-shim. Thus things that rely on systemd-shim
- implementations may regress.
+  * Minimal, as bin:systemd uses a separate build in the package with
+ additional patches to not intefere with cgmanager's name=systemd cgroup;
+ and instead deputy bin:systemd uses name=dsystemd cgroup for process
+ management.

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https://bugs.launchpad.net/bugs/1656280

Title:
  Support installing subordinate systemd on Ubuntu Desktop 14.04.5

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Trusty:
  Triaged

Bug description:
  Add support for installing deputy systemd for snapd on Ubuntu Desktop
  14.04.5

  When installed, deputy systemd provides a subset of functionality as required for snapd:
  * Providing necessary units for power management via systemctl
  * Provides private socket API access (and thus systemctl as root) only, and is not present on the system D-Bus
  * Does not conflict with systemd-shim
  * Does not change behaviour of systemd-services nor udeb build in anyway

  [Impact]

   * Users can install snapd without regressing Desktop support,
  lxc/lxc1/lxd abilities.

  [Test Case]

   * Power management works (e.g. shutdown/reboot via indicator-system
  and via systemctl)

   * Timedatectl commands report NTP status enable/disabled correctly,
  and can change it

   * Can install and use snapd

   * Can install and use lxc / lxc1 / lxd

  [Regression Potential]

   * Minimal, as bin:systemd uses a separate build in the package with
  additional patches to not intefere with cgmanager's name=systemd
  cgroup; and instead deputy bin:systemd uses name=dsystemd cgroup for
  process management.

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