blob: daa46b039fa815d860d64fd49e2f8c6b7bc18f78
| 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Support functions for mounting devices by label/uuid |
| 4 | * |
| 5 | * Copyright (C) 2006 by Jason Schoon <floydpink@gmail.com> |
| 6 | * Some portions cribbed from e2fsprogs, util-linux, dosfstools |
| 7 | * |
| 8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 9 | */ |
| 10 | //config:config FINDFS |
| 11 | //config: bool "findfs" |
| 12 | //config: default y |
| 13 | //config: select PLATFORM_LINUX |
| 14 | //config: select VOLUMEID |
| 15 | //config: help |
| 16 | //config: Prints the name of a filesystem with given label or UUID. |
| 17 | //config: WARNING: |
| 18 | //config: With all submodules selected, it will add ~8k to busybox. |
| 19 | |
| 20 | /* Benefits from suid root: better access to /dev/BLOCKDEVs: */ |
| 21 | //applet:IF_FINDFS(APPLET(findfs, BB_DIR_SBIN, BB_SUID_MAYBE)) |
| 22 | |
| 23 | //kbuild:lib-$(CONFIG_FINDFS) += findfs.o |
| 24 | |
| 25 | //usage:#define findfs_trivial_usage |
| 26 | //usage: "LABEL=label or UUID=uuid" |
| 27 | //usage:#define findfs_full_usage "\n\n" |
| 28 | //usage: "Find a filesystem device based on a label or UUID" |
| 29 | //usage: |
| 30 | //usage:#define findfs_example_usage |
| 31 | //usage: "$ findfs LABEL=MyDevice" |
| 32 | |
| 33 | #include "libbb.h" |
| 34 | #include "volume_id.h" |
| 35 | |
| 36 | int findfs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 37 | int findfs_main(int argc UNUSED_PARAM, char **argv) |
| 38 | { |
| 39 | char *dev = *++argv; |
| 40 | |
| 41 | if (!dev) |
| 42 | bb_show_usage(); |
| 43 | |
| 44 | if (is_prefixed_with(dev, "/dev/")) { |
| 45 | /* Just pass any /dev/xxx name right through. |
| 46 | * This might aid in some scripts being able |
| 47 | * to call this unconditionally */ |
| 48 | dev = NULL; |
| 49 | } else { |
| 50 | /* Otherwise, handle LABEL=xxx and UUID=xxx, |
| 51 | * fail on anything else */ |
| 52 | if (!resolve_mount_spec(argv)) |
| 53 | bb_show_usage(); |
| 54 | } |
| 55 | |
| 56 | if (*argv != dev) { |
| 57 | puts(*argv); |
| 58 | return 0; |
| 59 | } |
| 60 | return 1; |
| 61 | } |
| 62 |