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[Ryan Harper <1695277@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Ubuntu Trusty 14.04 machine that mounts an overlayfs at
/var/spool/postfix, and this works great:

fs_setup:
  - label: postfix
    device: /dev/xvde
    filesystem: ext4
mounts:
- [ /dev/xvde, /mnt/postfix-overlay ]
- [ overlayfs, /var/spool/postfix, "overlayfs", "defaults,lowerdir=/var/spool/postfix,upperdir=/mnt/postfix-overlay", "0", "2" ]
mount_default_fields: [ None, None, "auto", "defaults,nobootwait", "0", "2” ]

Upgrading the system image to Xenial 16.04 causes the overlayfs to fail
to mount with the error “missing ‘workdir’”.

Turns out, between Trusty and Xenial, the “workdir” directory in
overlayfs went from optional to mandatory, and now the system no longer
deploys.

What needs to happen is that after the fs_setup step that creates /mnt
/postfix-overlay, but before the mounts section where the overlayfs is
created, the workdir and upperdir directories need to be created on the
/mnt/postfix-overlay disk as /mnt/postfix-overlay/upperdir and /mnt
/postfix-overlay/workdir (or something) respectively.

** Affects: cloud-init
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1695277

Title:
  cc_mounts should ensure_dir on lower, upper and workdir params

Status in cloud-init:
  New

Bug description:
  Ubuntu Trusty 14.04 machine that mounts an overlayfs at
  /var/spool/postfix, and this works great:

  fs_setup:
    - label: postfix
      device: /dev/xvde
      filesystem: ext4
  mounts:
  - [ /dev/xvde, /mnt/postfix-overlay ]
  - [ overlayfs, /var/spool/postfix, "overlayfs", "defaults,lowerdir=/var/spool/postfix,upperdir=/mnt/postfix-overlay", "0", "2" ]
  mount_default_fields: [ None, None, "auto", "defaults,nobootwait", "0", "2” ]

  Upgrading the system image to Xenial 16.04 causes the overlayfs to
  fail to mount with the error “missing ‘workdir’”.

  Turns out, between Trusty and Xenial, the “workdir” directory in
  overlayfs went from optional to mandatory, and now the system no
  longer deploys.

  What needs to happen is that after the fs_setup step that creates /mnt
  /postfix-overlay, but before the mounts section where the overlayfs is
  created, the workdir and upperdir directories need to be created on
  the /mnt/postfix-overlay disk as /mnt/postfix-overlay/upperdir and
  /mnt/postfix-overlay/workdir (or something) respectively.

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