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