[821] | 1 | /* vi: set sw=4 ts=4: */
|
---|
| 2 | /*
|
---|
| 3 | * mountpoint implementation for busybox
|
---|
| 4 | *
|
---|
| 5 | * Copyright (C) 2005 Bernhard Fischer
|
---|
| 6 | *
|
---|
| 7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
|
---|
| 8 | *
|
---|
| 9 | * Based on sysvinit's mountpoint
|
---|
| 10 | */
|
---|
| 11 |
|
---|
| 12 | #include "busybox.h"
|
---|
| 13 | #include <sys/stat.h>
|
---|
| 14 | #include <errno.h> /* errno */
|
---|
| 15 | #include <string.h> /* strerror */
|
---|
| 16 | #include <getopt.h> /* optind */
|
---|
| 17 |
|
---|
| 18 | int mountpoint_main(int argc, char **argv)
|
---|
| 19 | {
|
---|
| 20 | int opt = bb_getopt_ulflags(argc, argv, "qdx");
|
---|
| 21 | #define OPT_q (1)
|
---|
| 22 | #define OPT_d (2)
|
---|
| 23 | #define OPT_x (4)
|
---|
| 24 |
|
---|
| 25 | if (optind != argc - 1)
|
---|
| 26 | bb_show_usage();
|
---|
| 27 | {
|
---|
| 28 | char *arg = argv[optind];
|
---|
| 29 | struct stat st;
|
---|
| 30 |
|
---|
| 31 | if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
|
---|
| 32 | if (opt & OPT_x) {
|
---|
| 33 | if (S_ISBLK(st.st_mode))
|
---|
| 34 | {
|
---|
| 35 | bb_printf("%u:%u\n", major(st.st_rdev),
|
---|
| 36 | minor(st.st_rdev));
|
---|
| 37 | return EXIT_SUCCESS;
|
---|
| 38 | } else {
|
---|
| 39 | if (opt & OPT_q)
|
---|
| 40 | putchar('\n');
|
---|
| 41 | else
|
---|
| 42 | bb_error_msg("%s: not a block device", arg);
|
---|
| 43 | }
|
---|
| 44 | return EXIT_FAILURE;
|
---|
| 45 | } else
|
---|
| 46 | if (S_ISDIR(st.st_mode)) {
|
---|
| 47 | dev_t st_dev = st.st_dev;
|
---|
| 48 | ino_t st_ino = st.st_ino;
|
---|
| 49 | char *p = bb_xasprintf("%s/..", arg);
|
---|
| 50 |
|
---|
| 51 | if (stat(p, &st) == 0) {
|
---|
| 52 | short ret = (st_dev != st.st_dev) ||
|
---|
| 53 | (st_dev == st.st_dev && st_ino == st.st_ino);
|
---|
| 54 | if (opt & OPT_d)
|
---|
| 55 | bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
|
---|
| 56 | else if (!(opt & OPT_q))
|
---|
| 57 | bb_printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
|
---|
| 58 | return !ret;
|
---|
| 59 | }
|
---|
| 60 | } else {
|
---|
| 61 | if (!(opt & OPT_q))
|
---|
| 62 | bb_error_msg("%s: not a directory", arg);
|
---|
| 63 | return EXIT_FAILURE;
|
---|
| 64 | }
|
---|
| 65 | }
|
---|
| 66 | if (!(opt & OPT_q))
|
---|
| 67 | bb_perror_msg("%s", arg);
|
---|
| 68 | return EXIT_FAILURE;
|
---|
| 69 | }
|
---|
| 70 | }
|
---|