[Bug 1577001] Re: Installing lxd leaves /var/lib/lxd/unix.socket with wrong group ownership

[Martin Pitt]

I created https://github.com/systemd/systemd/issues/3171 for changing
the socket group on reload with an absent unit. This will not be an
issue any more when lxd's prerm stops `lxd.socket` on removal, but (1)
this sounds worth fixing anyway, and (2) I have some feeling that the
above reproducer is not the complete story here yet. Waiting on Dan's
answer for that.

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Title:
  Installing lxd leaves /var/lib/lxd/unix.socket with wrong group
  ownership

Status in lxd package in Ubuntu:
  New
Status in systemd package in Ubuntu:
  Confirmed

Bug description:
  On ubuntu 16.04, doing
    sudo apt-get install lxd
  sometimes leaves the file
    /var/lib/lxd/unix.socket
  with group root, but it should have group lxd.   Doing
    sudo systemctl restart lxd.socket
  rescues the file and gives it the right group ownership.

  Adding logging to the package's postinst shows that, if /var/lib/lxd/unix.socket did not already exist, it is created by the line
   deb-systemd-helper enable lxd.service
  and with the wrong group permissions.
  If the socket already existed with the correct group ownership that command breaks the permissions and sets it to be group root.

  It's about 90% repeatable on one machine here (with an SSD main disk).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: lxd 2.0.0-0ubuntu4
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sat Apr 30 08:24:53 2016
  InstallationDate: Installed on 2016-03-26 (35 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta amd64 (20160323)
  SourcePackage: lxd
  UpgradeStatus: No upgrade log present (probably fresh install)

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