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- /* mountpoint.c - Check if a directory is a mountpoint.
- *
- * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com>
- USE_MOUNTPOINT(NEWTOY(mountpoint, "<1qdx[-dx]", TOYFLAG_BIN))
- config MOUNTPOINT
- bool "mountpoint"
- default y
- help
- usage: mountpoint [-qd] DIR
- mountpoint [-qx] DEVICE
- Check whether the directory or device is a mountpoint.
- -q Be quiet, return zero if directory is a mountpoint
- -d Print major/minor device number of the directory
- -x Print major/minor device number of the block device
- */
- #define FOR_mountpoint
- #include "toys.h"
- static void die(char *gripe)
- {
- if (!(toys.optflags & FLAG_q)) printf("%s: not a %s\n", *toys.optargs, gripe);
- toys.exitval++;
- xexit();
- }
- void mountpoint_main(void)
- {
- struct stat st1, st2;
- char *arg = *toys.optargs;
- int quiet = toys.optflags & FLAG_q;
- if (lstat(arg, &st1)) perror_exit_raw(arg);
- if (toys.optflags & FLAG_x) {
- if (S_ISBLK(st1.st_mode)) {
- if (!quiet)
- printf("%u:%u\n", dev_major(st1.st_rdev), dev_minor(st1.st_rdev));
- return;
- }
- die("block device");
- }
- // TODO: Ignore the fact a file can be a mountpoint for --bind mounts.
- if (!S_ISDIR(st1.st_mode)) die("directory");
- arg = xmprintf("%s/..", arg);
- xstat(arg, &st2);
- if (CFG_TOYBOX_FREE) free(arg);
- // If the device is different, it's a mount point. If the device _and_
- // inode are the same, it's probably "/". This misses --bind mounts from
- // elsewhere in the same filesystem, but so does the other one and in the
- // absence of a spec I guess that's the expected behavior?
- toys.exitval = !(st1.st_dev != st2.st_dev || st1.st_ino == st2.st_ino);
- if (toys.optflags & FLAG_d)
- printf("%u:%u\n", dev_major(st1.st_dev), dev_minor(st1.st_dev));
- else if (!quiet)
- printf("%s is %sa mountpoint\n", *toys.optargs, toys.exitval ? "not " : "");
- }
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