Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2087535
In threaded programs it's required to not call functions that are
not async-thread safe between fork(2) and exec(3).
Unfortunately initgroups(3) is not async-thread safe but is called
between these two functions and it leads to automount(8) hanging.
But getgroups(2) and setgroups(2) can be used for this and even though
setgroups(2) is not listed as async-thread safe it is in fact safe to
call here.
This MR changes automount(8) to use getgroups(2)/setgroups(2) instead
if initgroups(3) and testing shows that this resolves the hang problem.
Resolves: rhbz#2087535
Signed-off-by: Ian Kent ikent@redhat.com
