66426760be
function old new delta packed_usage 28706 28623 -83 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* mountpoint implementation for busybox
|
|
*
|
|
* Copyright (C) 2005 Bernhard Reutner-Fischer
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*
|
|
* Based on sysvinit's mountpoint
|
|
*/
|
|
|
|
//usage:#define mountpoint_trivial_usage
|
|
//usage: "[-q] <[-dn] DIR | -x DEVICE>"
|
|
//usage:#define mountpoint_full_usage "\n\n"
|
|
//usage: "Check if the directory is a mountpoint\n"
|
|
//usage: "\n -q Quiet"
|
|
//usage: "\n -d Print major/minor device number of the filesystem"
|
|
//usage: "\n -n Print device name of the filesystem"
|
|
//usage: "\n -x Print major/minor device number of the blockdevice"
|
|
//usage:
|
|
//usage:#define mountpoint_example_usage
|
|
//usage: "$ mountpoint /proc\n"
|
|
//usage: "/proc is not a mountpoint\n"
|
|
//usage: "$ mountpoint /sys\n"
|
|
//usage: "/sys is a mountpoint\n"
|
|
|
|
#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) {
|
|
const char *d = find_block_device(arg);
|
|
/* name is undefined, but device is mounted -> anonymous superblock! */
|
|
/* happens with btrfs */
|
|
if (!d) {
|
|
d = "UNKNOWN";
|
|
/* TODO: iterate /proc/mounts, or /proc/self/mountinfo
|
|
* to find out the device name */
|
|
}
|
|
printf("%s %s\n", d, 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;
|
|
}
|