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mountpoint: add -n option (by Vladimir)

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text    data     bss     dec     hex filename
 799859     560    7748  808167   c54e7 busybox_old
 799845     560    7748  808153   c54d9 busybox_unstripped
This commit is contained in:
Denis Vlasenko 2008-11-29 12:54:16 +00:00
parent d723fb155d
commit 7a1ddf20f3
2 changed files with 47 additions and 40 deletions
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5
include/usage.h
View File

@ -2788,12 +2788,13 @@
"Returns 0 for success, number of failed mounts for -a, or errno for one mount."
#define mountpoint_trivial_usage \
"[-q] <[-d] DIR | -x DEVICE>"
"[-q] <[-dn] DIR | -x DEVICE>"
#define mountpoint_full_usage "\n\n" \
"mountpoint checks if the directory is a mountpoint\n" \
"Check if the directory is a mountpoint\n" \
"\nOptions:" \
"\n -q Quiet" \
"\n -d Print major/minor device number of the filesystem" \
"\n -n Print device name of the filesystem" \
"\n -x Print major/minor device number of the blockdevice" \
#define mountpoint_example_usage \

82
miscutils/mountpoint.c
View File

@ -12,55 +12,61 @@
#include "libbb.h"
int mountpoint_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int mountpoint_main(int argc, char **argv)
int mountpoint_main(int argc UNUSED_PARAM, char **argv)
{
struct stat st;
const char *msg;
char *arg;
int opt = getopt32(argv, "qdx");
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)
if (optind != argc - 1)
bb_show_usage();
#define OPT_n (8)
arg = argv[optind];
msg = "%s";
if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
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;
} else {
if (opt & OPT_q)
bb_putchar('\n');
else
bb_error_msg("%s: not a block device", arg);
}
return EXIT_FAILURE;
} else
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);
rc = (opt & OPT_x) ? stat(arg, &st) : lstat(arg, &st);
if (rc != 0)
goto err;
if (stat(p, &st) == 0) {
int ret = (st_dev != st.st_dev) ||
(st_dev == st.st_dev && st_ino == st.st_ino);
if (opt & OPT_d)
printf("%u:%u\n", major(st_dev), minor(st_dev));
else if (!(opt & OPT_q))
printf("%s is %sa mountpoint\n", arg, ret?"":"not ");
return !ret;
}
} else {
if (!(opt & OPT_q))
bb_error_msg("%s: not a directory", arg);
return EXIT_FAILURE;
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_simple_perror_msg(arg);
bb_perror_msg(msg, arg);
return EXIT_FAILURE;
}