ikiwiki-mass-rebuild: under $! before setting $) to avoid strange errno issue

This fixes a problem sgran saw on alioth. Apparently nss-db sets errno to
ENOENT as a side effect trying to read an optional file, but succeeds
anyway. Then, somehow, errno remains set across the library calls made by
$).

So unset it first as a workaround; there's probably a nss-db, libc, and/or
perl bug underneath.

1 files changed, 1 insertions, 0 deletions

diff --git a/ikiwiki-mass-rebuild b/ikiwiki-mass-rebuild
index 8cc6f45c1..0057beb4f 100755
--- a/ikiwiki-mass-rebuild
+++ b/ikiwiki-mass-rebuild
@@ -34,6 +34,7 @@ sub processline {
 	if (! $pid) {
 		my ($uuid, $ugid) = (getpwnam($user))[2, 3];
 		my $grouplist=join(" ", $ugid, $ugid, supplemental_groups($user));
+		undef $!;
 		$)=$grouplist;
 		if ($!) {
 			die "failed to set egid $grouplist: $!";