`id -Gn' (invoked by groups) would fail without giving a diagnostic

on malconfigured systems.
(print_user): Give a diagnostic if number->name lookup fails.
(print_group): Likewise.

1 files changed, 8 insertions, 2 deletions

diff --git a/src/id.c b/src/id.c
index e57488318..50f5a73da 100644
--- a/src/id.c
+++ b/src/id.c
@@ -208,7 +208,10 @@ print_user (uid_t uid)
     {
       pwd = getpwuid (uid);
       if (pwd == NULL)
-	problems++;
+	{
+	  error (0, 0, _("cannot find name for user ID %u"), uid);
+	  problems++;
+	}
     }
 
   if (pwd == NULL)
@@ -228,7 +231,10 @@ print_group (gid_t gid)
     {
       grp = getgrgid (gid);
       if (grp == NULL)
-	problems++;
+	{
+	  error (0, 0, _("cannot find name for group ID %u"), gid);
+	  problems++;
+	}
     }
 
   if (grp == NULL)