ikiwiki-mass-rebuild: Don't trust $! when setting $)

A better fix, just check that what $) returns is what it was asked to set,
and ignore $! entirely.

1 files changed, 1 insertions, 3 deletions

diff --git a/ikiwiki-mass-rebuild b/ikiwiki-mass-rebuild
index 0057beb4f..b40eb0b3b 100755
--- a/ikiwiki-mass-rebuild
+++ b/ikiwiki-mass-rebuild
@@ -34,9 +34,7 @@ sub processline {
 	if (! $pid) {
 		my ($uuid, $ugid) = (getpwnam($user))[2, 3];
 		my $grouplist=join(" ", $ugid, $ugid, supplemental_groups($user));
-		undef $!;
-		$)=$grouplist;
-		if ($!) {
+		if (($)=$grouplist) ne $grouplist) {
 			die "failed to set egid $grouplist: $!";
 		}
 		$(=$ugid;