[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * mountpoint implementation for busybox
|
---|
| 4 | *
|
---|
[2725] | 5 | * Copyright (C) 2005 Bernhard Reutner-Fischer
|
---|
[821] | 6 | *
|
---|
[2725] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
---|
[821] | 8 | *
|
---|
| 9 | * Based on sysvinit's mountpoint
|
---|
| 10 | */
|
---|
| 11 |
|
---|
[3232] | 12 | //usage:#define mountpoint_trivial_usage
|
---|
| 13 | //usage: "[-q] <[-dn] DIR | -x DEVICE>"
|
---|
| 14 | //usage:#define mountpoint_full_usage "\n\n"
|
---|
| 15 | //usage: "Check if the directory is a mountpoint\n"
|
---|
| 16 | //usage: "\n -q Quiet"
|
---|
| 17 | //usage: "\n -d Print major/minor device number of the filesystem"
|
---|
| 18 | //usage: "\n -n Print device name of the filesystem"
|
---|
| 19 | //usage: "\n -x Print major/minor device number of the blockdevice"
|
---|
| 20 | //usage:
|
---|
| 21 | //usage:#define mountpoint_example_usage
|
---|
| 22 | //usage: "$ mountpoint /proc\n"
|
---|
| 23 | //usage: "/proc is not a mountpoint\n"
|
---|
| 24 | //usage: "$ mountpoint /sys\n"
|
---|
| 25 | //usage: "/sys is a mountpoint\n"
|
---|
| 26 |
|
---|
[1765] | 27 | #include "libbb.h"
|
---|
[821] | 28 |
|
---|
[2725] | 29 | int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 30 | int mountpoint_main(int argc UNUSED_PARAM, char **argv)
|
---|
[821] | 31 | {
|
---|
[1765] | 32 | struct stat st;
|
---|
[2725] | 33 | const char *msg;
|
---|
[1765] | 34 | char *arg;
|
---|
[2725] | 35 | int rc, opt;
|
---|
| 36 |
|
---|
| 37 | opt_complementary = "=1"; /* must have one argument */
|
---|
| 38 | opt = getopt32(argv, "qdxn");
|
---|
[821] | 39 | #define OPT_q (1)
|
---|
| 40 | #define OPT_d (2)
|
---|
| 41 | #define OPT_x (4)
|
---|
[2725] | 42 | #define OPT_n (8)
|
---|
| 43 | arg = argv[optind];
|
---|
| 44 | msg = "%s";
|
---|
[821] | 45 |
|
---|
[2725] | 46 | rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
|
---|
| 47 | if (rc != 0)
|
---|
| 48 | goto err;
|
---|
[821] | 49 |
|
---|
[2725] | 50 | if (opt & OPT_x) {
|
---|
| 51 | if (S_ISBLK(st.st_mode)) {
|
---|
| 52 | printf("%u:%u\n", major(st.st_rdev),
|
---|
| 53 | minor(st.st_rdev));
|
---|
| 54 | return EXIT_SUCCESS;
|
---|
| 55 | }
|
---|
| 56 | errno = 0; /* make perror_msg work as error_msg */
|
---|
| 57 | msg = "%s: not a block device";
|
---|
| 58 | goto err;
|
---|
| 59 | }
|
---|
[821] | 60 |
|
---|
[2725] | 61 | errno = ENOTDIR;
|
---|
| 62 | if (S_ISDIR(st.st_mode)) {
|
---|
| 63 | dev_t st_dev = st.st_dev;
|
---|
| 64 | ino_t st_ino = st.st_ino;
|
---|
| 65 | char *p = xasprintf("%s/..", arg);
|
---|
[1765] | 66 |
|
---|
[2725] | 67 | if (stat(p, &st) == 0) {
|
---|
| 68 | //int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino);
|
---|
| 69 | int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino);
|
---|
| 70 |
|
---|
| 71 | if (opt & OPT_d)
|
---|
| 72 | printf("%u:%u\n", major(st_dev), minor(st_dev));
|
---|
| 73 | if (opt & OPT_n) {
|
---|
| 74 | const char *d = find_block_device(arg);
|
---|
| 75 | /* name is undefined, but device is mounted -> anonymous superblock! */
|
---|
| 76 | /* happens with btrfs */
|
---|
| 77 | if (!d) {
|
---|
| 78 | d = "UNKNOWN";
|
---|
| 79 | /* TODO: iterate /proc/mounts, or /proc/self/mountinfo
|
---|
| 80 | * to find out the device name */
|
---|
| 81 | }
|
---|
| 82 | printf("%s %s\n", d, arg);
|
---|
[1765] | 83 | }
|
---|
[2725] | 84 | if (!(opt & (OPT_q | OPT_d | OPT_n)))
|
---|
| 85 | printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : "");
|
---|
| 86 | return is_not_mnt;
|
---|
[821] | 87 | }
|
---|
[2725] | 88 | arg = p;
|
---|
| 89 | /* else: stat had set errno, just fall through */
|
---|
[821] | 90 | }
|
---|
[2725] | 91 |
|
---|
| 92 | err:
|
---|
[1765] | 93 | if (!(opt & OPT_q))
|
---|
[2725] | 94 | bb_perror_msg(msg, arg);
|
---|
[1765] | 95 | return EXIT_FAILURE;
|
---|
[821] | 96 | }
|
---|