support for mount by label (not yet tested)

Also adds findfs applet. Closes bug 1143.

util-linux/findfs.c

@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Support functions for mounting devices by label/uuid
+ *
+ * Copyright (C) 2006 by Jason Schoon <floydpink@gmail.com>
+ * Some portions cribbed from e2fsprogs, util-linux, dosfstools
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+#include "volume_id.h"
+
+int findfs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int findfs_main(int argc, char **argv)
+{
+	char *tmp = NULL;
+
+	if (argc != 2)
+		bb_show_usage();                                                                                                             
+
+	if (!strncmp(argv[1], "LABEL=", 6))
+		tmp = get_devname_from_label(argv[1] + 6);
+	else if (!strncmp(argv[1], "UUID=", 5))
+		tmp = get_devname_from_uuid(argv[1] + 5);
+	else if (!strncmp(argv[1], "/dev/", 5)) {
+		/* Just pass a device name right through.  This might aid in some scripts
+	   	being able to call this unconditionally */
+		tmp = argv[1];
+	} else
+		bb_show_usage();
+		
+	if (tmp) { 
+		puts(tmp);                                                                                                                   
+		return 0;
+	}
+	return 1;
+}