update receiver to handle symlinks

symlinks need to be send to a new rpc "filedata.2" because the old rpc
can't handle it. the updated receiver is installed under the old name
"filedata" too in case older daemons send push

clusterd

@@ -302,6 +302,7 @@ our ($udp_peer_addr,$udp_peer_port);	 # ('141.14.12.12',1234)
 our %UDP_HANDLER=
 (
 	'filedata' => \&udp_rx_filedata,
+	'filedata.2' => \&udp_rx_filedata,
 	'amdtardata' => \&udp_rx_amdtardata,
 	'loadavg.2' => \&udp_rx_loadavg2,
 	'restart' => \&udp_rx_restart,
@@ -587,6 +588,24 @@ sub udp_rx_filedata {
 		return;
 	}
 
+	if ($st_want->type eq 'L') {
+		if (!$st_is || $st_is->type ne 'L' || $st_is->target ne $st_want->target) {
+			 $st_is and (unlink($filename) or return warn "$filename: failed to unlink: $!\n");
+			symlink($st_want->target,$filename) or return warn "$filename: failed to create symlink: $!\n";
+			lchown($st_want->uid,$st_want->gid,$filename);
+			lmtime($st_want->mtime,$filename);
+			warn "installed $filename -> ".$st_want->target."\n";
+		} else {
+			if ($st_is->uid != $st_want->uid || $st_is->gid != $st_want->gid) {
+				lchown($st_want->uid,$st_want->gid,$filename);
+			}
+			if ($st_is->mtime != $st_want->mtime) {
+				lmtime($st_want->mtime,$filename);
+			}
+		}
+		return;
+	}
+
 	if (length($data) == $st_want->size) {
 		# complete file in one broadcast
 		my $fh=IO::File->new($tmp_filename,O_WRONLY|O_CREAT,0);