Public bug reported:
lsb_release -rdc
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Codename: focal
apt-cache policy libnss-sss
libnss-sss:
Installed: 2.2.3-3ubuntu0.3
Candidate: 2.2.3-3ubuntu0.3
Version table:
*** 2.2.3-3ubuntu0.3 500
500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
100 /var/lib/dpkg/status
2.2.3-3ubuntu0.1 500
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
2.2.3-3 500
500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
libnss-sss has a postinst script that modifies /etc/nsswitch.conf and
adds "sss" to many of the lines. (/var/lib/dpkg/info/libnss-
sss:amd64.postinst)
After running `apt remove libnss-sss`, the same lines are modified again
in /etc/nsswitch.conf to remove the changes.
If you then install libnss-sss again, nsswitch.conf is NOT re-modified
on subsequent installs. libnss-sss will only re-modify
/etc/nsswitch.conf if it has been purged first / "clean" install.
Expectation: if config is changed *only* during initial install, then
config should be left behind during a remove, and config only removed
when the package is *purged*.
The only exception I can think of is if there's some specific reason to
want to back out the changes to /etc/nsswitch.conf any time libnss-sss
is removed (but *not* purged)... and if this is the case, then I'd think
maybe the postinst script should be *re-adding* "sss" to nsswitch.conf
on *any* install/reinstall (even if it wasn't purged first).
** Affects: sssd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1916562
Title:
libnss-sss removes config when not being purged
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