[Bug 1840375] [shadow/xenial] verification still needed

[Brian Murray]

The fix for this bug has been awaiting testing feedback in the -proposed
repository for xenial for more than 90 days.  Please test this fix and
update the bug appropriately with the results.  In the event that the
fix for this bug is still not verified 15 days from now, the package
will be removed from the -proposed repository.

** Tags added: removal-candidate

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https://bugs.launchpad.net/bugs/1840375

Title:
  groupdel doesn't support extrausers

Status in snapd:
  Fix Released
Status in shadow package in Ubuntu:
  Fix Released
Status in shadow source package in Xenial:
  Fix Committed
Status in shadow source package in Bionic:
  Fix Released
Status in shadow source package in Disco:
  Won't Fix

Bug description:
  snapd needs the ability to call 'groupdel --extrausers foo' to clean
  up after itself, but --extrausers is currently unsupported.

  [Impact]
  On ubuntu-core systems we want to be able to manage "extrausers" in the same
  way as regular users. This requires updates to the various {user,group}{add,del} tools. Right now "groupdel" cannot handle extrausers.

  This is an important feature for Ubuntu Core

  [Test Case]
  0. upgrade the "passwd" to the version in {xenial,bionic}-proposed
  1. install the libnss-extrausers and add "extrauers" to the passwd and shadow line (see /usr/share/doc/libnss-extrausers/README for the modifications in sswitch.conf)
  2. run "groupadd --extrausers foo" and verify "grep foo /var/lib/extrausers/group"
  3  check /var/lib/extrausers/group for the new "foo" group
  4. run "groupdel --extrausers foo"
  5. check /var/lib/extrausers/group and ensure the "foo" group is removed

  [Regression Potential]

   * low: this adds a new (optional) option which is off by default

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