busybox/util-linux/findfs.c

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/* 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 source tree.
*/
//config:config FINDFS
//config: bool "findfs"
//config: default y
//config: select PLATFORM_LINUX
//config: select VOLUMEID
//config: help
//config: Prints the name of a filesystem with given label or UUID.
//config: WARNING:
//config: With all submodules selected, it will add ~8k to busybox.
/* Benefits from suid root: better access to /dev/BLOCKDEVs: */
//applet:IF_FINDFS(APPLET(findfs, BB_DIR_SBIN, BB_SUID_MAYBE))
//kbuild:lib-$(CONFIG_FINDFS) += findfs.o
//usage:#define findfs_trivial_usage
//usage: "LABEL=label or UUID=uuid"
//usage:#define findfs_full_usage "\n\n"
//usage: "Find a filesystem device based on a label or UUID"
//usage:
//usage:#define findfs_example_usage
//usage: "$ findfs LABEL=MyDevice"
#include "libbb.h"
#include "volume_id.h"
int findfs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int findfs_main(int argc UNUSED_PARAM, char **argv)
{
char *dev = *++argv;
if (!dev)
bb_show_usage();
libbb: introduce and use is_prefixed_with() function old new delta is_prefixed_with - 18 +18 complete_username 78 77 -1 man_main 737 735 -2 fsck_device 429 427 -2 unpack_ar_archive 80 76 -4 strip_unsafe_prefix 105 101 -4 singlemount 1054 1050 -4 rtc_adjtime_is_utc 90 86 -4 resolve_mount_spec 88 84 -4 parse_one_line 1029 1025 -4 parse_conf 1460 1456 -4 may_wakeup 83 79 -4 loadkmap_main 219 215 -4 get_irqs_from_stat 103 99 -4 get_header_cpio 913 909 -4 findfs_main 79 75 -4 fbsplash_main 1230 1226 -4 load_crontab 776 771 -5 expand_vars_to_list 1151 1146 -5 date_main 881 876 -5 skip_dev_pfx 30 24 -6 make_device 2199 2193 -6 complete_cmd_dir_file 773 767 -6 run_applet_and_exit 715 708 -7 uudecode_main 321 313 -8 pwdx_main 197 189 -8 execute 568 560 -8 i2cdetect_main 1186 1176 -10 procps_scan 1242 1230 -12 procps_read_smaps 1017 1005 -12 process_module 746 734 -12 patch_main 1903 1891 -12 nfsmount 3572 3560 -12 stack_machine 126 112 -14 process_timer_stats 449 435 -14 match_fstype 111 97 -14 do_ipaddr 1344 1330 -14 open_list_and_close 359 343 -16 get_header_tar 1795 1779 -16 prepend_new_eth_table 340 323 -17 fsck_main 1811 1794 -17 find_iface_state 56 38 -18 dnsd_main 1321 1303 -18 base_device 179 158 -21 find_keyword 104 82 -22 handle_incoming_and_exit 2785 2762 -23 parse_and_put_prompt 774 746 -28 modinfo 347 317 -30 find_action 204 171 -33 update_passwd 1470 1436 -34 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 0/49 up/down: 18/-540) Total: -522 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2015-03-12 22:18:34 +05:30
if (is_prefixed_with(dev, "/dev/")) {
/* Just pass any /dev/xxx name right through.
* This might aid in some scripts being able
* to call this unconditionally */
dev = NULL;
} else {
/* Otherwise, handle LABEL=xxx and UUID=xxx,
* fail on anything else */
if (!resolve_mount_spec(argv))
bb_show_usage();
}
if (*argv != dev) {
puts(*argv);
return 0;
}
return 1;
}