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[Scott Moser <smoser@xxxxxxxxxx>]

** Changed in: cloud-init (Ubuntu)
       Status: New => Confirmed

** Changed in: cloud-init (Ubuntu)
   Importance: Undecided => High

** Also affects: cloud-init
   Importance: Undecided
       Status: New

** Changed in: cloud-init
       Status: New => Confirmed

** Changed in: cloud-init
   Importance: Undecided => High

** Changed in: cloud-init
     Assignee: (unassigned) => Ryan Harper (raharper)

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https://bugs.launchpad.net/bugs/1619393

Title:
  cloud-init useradd/groupadd fails on ubuntu-core-16 with readonly
  /etc/passwd

Status in cloud-init:
  Confirmed
Status in cloud-init package in Ubuntu:
  Confirmed

Bug description:
  When running under ubuntu-core 16 images, /etc/passwd is read-only.

  If my user-data includes any non-default username, creation fails due to
  the read-only nature of the image.

  This is addressed by useradd/groupadd including a command line flag, --extrausers
  which instructs the command to look for a different user/group database in 
  /var/lib/extrausers , which is writable in the ubuntu-core 16 image.

  The cc_user_groups module though is not aware of this.

  The Distro base-class could check if the system it's running on is snappy (see cc_snappy.py)
  and if so, append the --extrausers parameter to the useradd/groupadd commands.

  1) release is Xenial (ubuntu-core 16)
  2) cloud-init present is: 0.7.7~bzr1256-0ubuntu1~16.04.1
  3) useradd bob -m should create the user bob
  4) useradd fails due to readonly /etc/{passwd,group,shadow}

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