cvsserver: Allow to "add" a removed file

CVS allows you to add a removed file (where the
removal is not yet committed) which will
cause the server to send the latest revision of the
file and to delete the "removed" status.

Copy this behaviour.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-cvsserver.perl

@@ -360,12 +360,52 @@ sub req_add
 
     argsplit("add");
 
+    my $updater = GITCVS::updater->new($state->{CVSROOT}, $state->{module}, $log);
+    $updater->update();
+
+    argsfromdir($updater);
+
     my $addcount = 0;
 
     foreach my $filename ( @{$state->{args}} )
     {
         $filename = filecleanup($filename);
 
+        my $meta = $updater->getmeta($filename);
+        my $wrev = revparse($filename);
+
+        if ($wrev && $meta && ($wrev < 0))
+        {
+            # previously removed file, add back
+            $log->info("added file $filename was previously removed, send 1.$meta->{revision}");
+
+            print "MT +updated\n";
+            print "MT text U \n";
+            print "MT fname $filename\n";
+            print "MT newline\n";
+            print "MT -updated\n";
+
+            unless ( $state->{globaloptions}{-n} )
+            {
+                my ( $filepart, $dirpart ) = filenamesplit($filename,1);
+
+                print "Created $dirpart\n";
+                print $state->{CVSROOT} . "/$state->{module}/$filename\n";
+
+                # this is an "entries" line
+                my $kopts = kopts_from_path($filepart);
+                $log->debug("/$filepart/1.$meta->{revision}//$kopts/");
+                print "/$filepart/1.$meta->{revision}//$kopts/\n";
+                # permissions
+                $log->debug("SEND : u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}");
+                print "u=$meta->{mode},g=$meta->{mode},o=$meta->{mode}\n";
+                # transmit file
+                transmitfile($meta->{filehash});
+            }
+
+            next;
+        }
+
         unless ( defined ( $state->{entries}{$filename}{modified_filename} ) )
         {
             print "E cvs add: nothing known about `$filename'\n";