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... i.e., don't use the getpw* functions.
Before this change, running groups or id with no user name argument
would include a group name or ID from /etc/passwd. Thus, under unusual
circumstances (default group is changed, but has not taken effect for a
given session), those programs could print a name or ID that is neither
real nor effective.
To demonstrate, run this:
echo 'for i in 1 2; do id -G; sleep 1.5; done' \
|su -s /bin/sh ftp - &
sleep 1; perl -pi -e 's/^(ftp:x:\d+):(\d+)/$1:9876/' /etc/passwd
Those id -G commands printed the following:
50
50 9876
With this change, they print this:
50
50
Similarly, running those programs set-GID could make them
print one ID too many.
* src/group-list.c (print_group_list): When username is NULL, pass
egid, not getpwuid(ruid)->pw_gid), to xgetgroups, per the API
requirements of xgetgroups callee, mgetgroups.
When not using the password database, don't call getpwuid.
* NEWS (Bug fixes): Mention it.
* tests/misc/id-setgid: New file.
* tests/Makefile.am (TESTS): Add it.
(root_tests): It's a root-only test, so add it here, too.
Originally reported by Brynnen Owen as http://bugs.gnu.org/7320.
Raised again by Marc Mengel in http://bugzilla.redhat.com/816708.
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