display if group setting fails

diff --git a/ikiwiki-mass-rebuild b/ikiwiki-mass-rebuild
index 710db4eacffc22baa6e68f7dcf6a9a230b1d8907..8cc6f45c1d9f6fbd21b40e403bc3d5561bb93d3e 100755 (executable)
--- a/ikiwiki-mass-rebuild
+++ b/ikiwiki-mass-rebuild
@@ -36,7 +36,7 @@ sub processline {
                my $grouplist=join(" ", $ugid, $ugid, supplemental_groups($user));
                $)=$grouplist;
                if ($!) {
-                       die "failed to set egid $grouplist";
+                       die "failed to set egid $grouplist: $!";
                }
                $(=$ugid;
                $<=$uuid;