The dependency violates the comment in realloc-gnu, which
says that tests can't depend on realloc-gnu; some tests depend
on mgetgroups, so mgetgroups can't depend on realloc-gnu.
Problem reported by Daniel Richard G. in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-10/msg00056.html>.
* lib/mgetgroups.c (mgetgroups): Don't call realloc (NULL, 0).
* modules/mgetgroups (Depends-on): Depend on realloc-posix,
not realloc-gnu.
getgrouplist is part of glibc and LGPLv2+; the mgetgroups module
is merely an ease-of-use wrapper around this interface. There's
nothing in the algorithm worth protecting by the more-restrictive
GPLv3+. See also this thread.
https://lists.gnu.org/archive/html/bug-gnulib/2013-05/msg00092.html
* modules/getugroups (License): Change from GPLv3+.
* modules/mgetgroups (License): Likewise.
* modules/getgroups (License): Change from LGPLv3+.
Signed-off-by: Eric Blake <eblake@redhat.com>
ENOSYS implies that there are no supplemental groups, so we can
treat it the same as a return of 0 from getgroups rather than
exposing failure to the user. This in turn fixes a crash in
coreutils' id, which freed an uninitialized pointer.
* lib/mgetgroups.h (xgetgroups): New prototype.
* lib/mgetgroups.c (xgetgroups): New wrapper.
(mgetgroups): Handle ENOSYS.
* modules/mgetgroups (Depends-on): Add realloc.
Reported by Scott Harrison <scott.gnu.2009@scottrix.co.uk>.
Signed-off-by: Eric Blake <ebb9@byu.net>
Wrapper function that makes using getgroups/getugroups easier to use.
As part of the move from coreutils, convert GETGROUPS_T to gid_t,
and allow mgetgroups(NULL,getegid(),&list) as a way to ensure that
the effective gid is in the list.
* modules/mgetgroups: New file.
* lib/mgetgroups.h: Likewise.
* lib/mgetgroups.c (mgetgroups): Likewise.
* m4/mgetgroups.m4 (gl_MGETGROUPS): Likewise.
* MODULES.html.sh (Users and groups): Mention it.
Signed-off-by: Eric Blake <ebb9@byu.net>
