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/* vi: set sw=4 ts=4: */
/*
* mountpoint implementation for busybox
*
* Copyright (C) 2005 Bernhard Fischer
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Based on sysvinit's mountpoint
*/
#include "busybox.h"
#include <sys/stat.h>
#include <errno.h> /* errno */
#include <string.h> /* strerror */
#include <getopt.h> /* optind */
int mountpoint_main(int argc, char **argv)
{
int opt = bb_getopt_ulflags(argc, argv, "qdx");
#define OPT_q (1)
#define OPT_d (2)
#define OPT_x (4)
if (optind != argc - 1)
bb_show_usage();
{
char *arg = argv[optind];
struct stat st;
if ( (opt & OPT_x && stat(arg, &st) == 0) || (lstat(arg, &st) == 0) ) {
if (opt & OPT_x) {
if (S_ISBLK(st.st_mode))
{
bb_printf("%u:%u\n", major(st.st_rdev),
minor(st.st_rdev));
return EXIT_SUCCESS;
} else {
if (opt & OPT_q)
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 = bb_xasprintf("%s/..", arg);
if (stat(p, &st) == 0) {
short ret = (st_dev != st.st_dev) ||
(st_dev == st.st_dev && st_ino == st.st_ino);
if (opt & OPT_d)
bb_printf("%u:%u\n", major(st_dev), minor(st_dev));
else if (!(opt & OPT_q))
bb_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_q))
bb_perror_msg("%s", arg);
return EXIT_FAILURE;
}
}
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