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/* vi: set sw=4 ts=4: */
/*
* mountpoint implementation for busybox
*
* Copyright (C) 2005 Bernhard Reutner-Fischer
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Based on sysvinit's mountpoint
*/
#include "libbb.h"
int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mountpoint_main(int argc UNUSED_PARAM, char **argv)
{
struct stat st;
const char *msg;
char *arg;
int rc, opt;
opt_complementary = "=1"; /* must have one argument */
opt = getopt32(argv, "qdxn");
#define OPT_q (1)
#define OPT_d (2)
#define OPT_x (4)
#define OPT_n (8)
arg = argv[optind];
msg = "%s";
rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
if (rc != 0)
goto err;
if (opt & OPT_x) {
if (S_ISBLK(st.st_mode)) {
printf("%u:%u\n", major(st.st_rdev),
minor(st.st_rdev));
return EXIT_SUCCESS;
}
errno = 0; /* make perror_msg work as error_msg */
msg = "%s: not a block device";
goto err;
}
errno = ENOTDIR;
if (S_ISDIR(st.st_mode)) {
dev_t st_dev = st.st_dev;
ino_t st_ino = st.st_ino;
char *p = xasprintf("%s/..", arg);
if (stat(p, &st) == 0) {
//int is_mnt = (st_dev != st.st_dev) || (st_dev == st.st_dev && st_ino == st.st_ino);
int is_not_mnt = (st_dev == st.st_dev) && (st_ino != st.st_ino);
if (opt & OPT_d)
printf("%u:%u\n", major(st_dev), minor(st_dev));
if (opt & OPT_n)
printf("%s %s\n", find_block_device(arg), arg);
if (!(opt & (OPT_q | OPT_d | OPT_n)))
printf("%s is %sa mountpoint\n", arg, is_not_mnt ? "not " : "");
return is_not_mnt;
}
arg = p;
/* else: stat had set errno, just fall through */
}
err:
if (!(opt & OPT_q))
bb_perror_msg(msg, arg);
return EXIT_FAILURE;
}
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