[Bug 1547033] Re: please allow /etc/mtab to be a pre-existing link on readonly filesystems

[Oliver Grawert]

** Also affects: systemd
   Importance: Undecided
       Status: New

** Project changed: systemd => snappy

** Changed in: snappy
   Importance: Undecided => Medium

** Changed in: systemd (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1547033

Title:
  please allow /etc/mtab to be a pre-existing link on readonly
  filesystems

Status in Snappy:
  New
Status in systemd package in Ubuntu:
  New

Bug description:
  booting a snappy system which comes with a readonly file system that
  carries /etc/mtab as pre-created link in the readonly area of the fs
  (pointing to /proc/mounts), we always get an error message on boot
  when systemd-tmpfiles tries to re-create the mtab link.

  systemd-tmpfiles should instead check if /etc/mtab is already there,
  is a link and points to the desired target. in this case it should
  just skip the creation attempt gracefully without error.

  Feb 17 18:56:51 localhost systemd[1]: Starting Create Volatile Files and Directories...
  Feb 17 18:56:51 localhost systemd-tmpfiles[631]: [/usr/lib/tmpfiles.d/var.conf:14] Duplicate line for path "/var/log"
  , ignoring.
  Feb 17 18:56:51 localhost systemd-tmpfiles[631]: symlink(../proc/self/mounts, /etc/mtab) failed: Read-only file syste
  m
  Feb 17 18:56:51 localhost systemd[1]: systemd-tmpfiles-setup.service: Main process exited, code=exited, status=1/FAIL
  URE

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