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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", TOYFLAG_BIN))
config MOUNTPOINT
bool "mountpoint"
default y
help
usage: mountpoint [-q] [-d] directory
mountpoint [-q] [-x] device
-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"
void mountpoint_main(void)
{
struct stat st1, st2;
int res = 0;
int quiet = toys.optflags & FLAG_q;
toys.exitval = 1; // be pessimistic
strncpy(toybuf, toys.optargs[0], sizeof(toybuf));
if (((toys.optflags & FLAG_x) && lstat(toybuf, &st1)) || stat(toybuf, &st1))
perror_exit("%s", toybuf);
if (toys.optflags & FLAG_x){
if (S_ISBLK(st1.st_mode)) {
if (!quiet) printf("%u:%u\n", major(st1.st_rdev), minor(st1.st_rdev));
toys.exitval = 0;
return;
}
if (!quiet) printf("%s: not a block device\n", toybuf);
return;
}
if(!S_ISDIR(st1.st_mode)){
if (!quiet) printf("%s: not a directory\n", toybuf);
return;
}
strncat(toybuf, "/..", sizeof(toybuf));
stat(toybuf, &st2);
res = (st1.st_dev != st2.st_dev) ||
(st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
if (!quiet) printf("%s is %sa mountpoint\n", toys.optargs[0], res ? "" : "not ");
if (toys.optflags & FLAG_d)
printf("%u:%u\n", major(st1.st_dev), minor(st1.st_dev));
toys.exitval = res ? 0 : 1;
}
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