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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 (!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;
if (lstat(arg, &st1)) (FLAG(q) ? die : perror_exit_raw)(arg);
if (FLAG(x)) {
if (!S_ISBLK(st1.st_mode)) die("block device");
if (!FLAG(q))
printf("%u:%u\n", dev_major(st1.st_rdev), dev_minor(st1.st_rdev));
return;
}
// TODO: a file can be a mountpoint for --bind mounts.
if (!S_ISDIR(st1.st_mode)) die("directory");
arg = xmprintf("%s/..", arg);
xstat(arg, &st2);
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 (FLAG(d)) printf("%u:%u\n", dev_major(st1.st_dev), dev_minor(st1.st_dev));
else if (!FLAG(q))
printf("%s is %sa mountpoint\n", *toys.optargs, toys.exitval ? "not " : "");
}
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