[Bug 1607920] Re: zfs services fail on firstboot if zfs-utils is integrated into the deployment image

[scotte]

I tested this using my reproduction method in AWS EC2 with a test
package/PPA provided by Eric at Ubuntu (slashd) containing the commit
referenced in comment #6.

All looks good now - systemd units for ZFS no longer fail. Thanks for
moving this along!

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https://bugs.launchpad.net/bugs/1607920

Title:
  zfs services fail on firstboot if zfs-utils is integrated into the
  deployment image

Status in sysvinit package in Ubuntu:
  Won't Fix
Status in zfs-linux package in Ubuntu:
  In Progress

Bug description:
  [Impact]

   * zfs services fail on firstboot if zfs-utils is integrated into the
  deployment image.

   * Output from systemd - 
  sudo systemctl --failed 
  UNIT LOAD ACTIVE SUB DESCRIPTION 
  ● zfs-import-scan.service loaded failed failed Import ZFS pools by device scanning 
  ● zfs-mount.service loaded failed failed Mount ZFS filesystems 

   * This is particularly frustrating for users who use automated
  monitoring as it means virtual machines must always be restarted
  before showing as clean.

   * This failure is due to zfs services starting up before /etc/mtab
  has a chance to be symlinked to /proc/mounts.

  [Test Case]

   1. Grab a stock xenial image, and unpack it and add zfs-utils to it.  Repack it. 
   2. Boot machine
   3. Check systemctl --failed.

  [Regression Potential]

   *
   
  [Other Info]
   
   * This can likely be resolved in the systemd init scripts, by modifying zfs-linux to depend on /proc/mounts instead, or inclusion of /lib/init/mount-functions.sh in initscripts (sysvinit).

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