--- loncom/Attic/lchtmldir	2005/01/26 12:13:58	1.15
+++ loncom/Attic/lchtmldir	2005/04/07 22:27:52	1.16
@@ -144,7 +144,7 @@ my $safeuser = $patt;
 if($DEBUG) {
     print("Save username = $safeuser \n");
 }
-if(($username ne $safeuser) or ($safeuser!~/^[A-za-z]/)) {
+if(($username ne $safeuser) or ($safeuser!~/^[A-z]/)) {
     if($DEBUG) {
 	print("User name $username had illegal characters\n");
     }
@@ -185,6 +185,17 @@ if(!( -e $dirtry1)) {
         exit 6;
     }
 }
+if ($authentication eq "unix:") {
+    # check whether group $safeuser exists.
+    my $usergroups = `id -nG $safeuser`;
+    if (! grep /^$safeuser$/, split(/\s+/,$usergroups)) { 
+        if($DEBUG) {
+            print("Group \"$safeuser\" does not exist or $safeuser is not a member of that group.\n");
+        }
+        exit 7;
+    }
+}
+
 &EnableRoot;
 
 &System("/bin/mkdir -p $fulldir")   unless (-e $fulldir);