[Bug 1889092] Re: getent does not support extrausers on uc18

[Ian Johnson]

I added glibc since getent seems to come from libc-bin, which launchpad
tells me is tracked with glibc package?

Anyways, yes I think this is something we should strongly consider
backporting if the patch is already available in (at latest) groovy.

** Also affects: glibc (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1889092

Title:
  getent does not support extrausers on uc18

Status in snapd:
  Confirmed
Status in glibc package in Ubuntu:
  New

Bug description:
  for example, see this test:

  ```
  user at coreimg:~$ snap run --shell docker
  user at coreimg:/home/user$ grep docker /var/lib/extrausers/group
  docker:x:113:
  user at coreimg:/home/user$ grep docker /etc/group
  user at coreimg:/home/user$ getent group docker
  user at coreimg:/home/user$ 
  ```

  with a modified version of the core18 snap to move the docker gid
  definition from /etc/group to /var/lib/extrausers/group, this was
  based on the edge channel revision 1888 on arm64.

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