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/*
* mountpoint(1) - see if a directory is a mountpoint
*
* This is libmount based reimplementation of the mountpoit(1)
* from sysvinit project.
*
*
* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
* Written by Karel Zak <kzak@redhat.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libmount.h>
#include "nls.h"
#include "xalloc.h"
#include "c.h"
static int quiet;
static dev_t dir_to_device(const char *spec)
{
struct libmnt_table *tb = mnt_new_table_from_file("/proc/self/mountinfo");
struct libmnt_fs *fs;
dev_t res = 0;
if (!tb)
return 0;
fs = mnt_table_find_target(tb, spec, MNT_ITER_BACKWARD);
if (fs && mnt_fs_get_target(fs))
res = mnt_fs_get_devno(fs);
mnt_free_table(tb);
return res;
}
static int print_devno(const char *devname, struct stat *st)
{
struct stat stbuf;
if (!st && stat(devname, &stbuf) == 0)
st = &stbuf;
if (!st)
return -1;
if (!S_ISBLK(st->st_mode)) {
if (!quiet)
warnx(_("%s: not a block device"), devname);
return -1;
}
printf("%u:%u\n", major(st->st_rdev), minor(st->st_rdev));
return 0;
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs(_("\nUsage:\n"), out);
fprintf(out,
_(" %1$s [-qd] /path/to/directory\n"
" %1$s -x /dev/device\n"), program_invocation_short_name);
fputs(_("\nOptions:\n"), out);
fputs(_(" -q, --quiet quiet mode - don't print anything\n"
" -d, --fs-devno print maj:min device number of the filesystem\n"
" -x, --devno print maj:min device number of the block device\n"
" -h, --help this help\n"), out);
fprintf(out, _("\nFor more information see mountpoint(1).\n"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int c, fs_devno = 0, dev_devno = 0, rc = 0;
char *spec;
struct stat st;
static const struct option longopts[] = {
{ "quiet", 0, 0, 'q' },
{ "fs-devno", 0, 0, 'd' },
{ "devno", 0, 0, 'x' },
{ "help", 0, 0, 'h' },
{ NULL, 0, 0, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
mnt_init_debug(0);
while ((c = getopt_long(argc, argv, "qdxh", longopts, NULL)) != -1) {
switch(c) {
case 'q':
quiet = 1;
break;
case 'd':
fs_devno = 1;
break;
case 'x':
dev_devno = 1;
break;
case 'h':
usage(stdout);
break;
default:
usage(stderr);
break;
}
}
if (optind + 1 != argc)
usage(stderr);
spec = argv[optind++];
if (stat(spec, &st)) {
if (!quiet)
err(EXIT_FAILURE, "%s", spec);
return EXIT_FAILURE;
}
if (dev_devno)
rc = print_devno(spec, &st);
else {
dev_t src;
if (!S_ISDIR(st.st_mode)) {
if (!quiet)
errx(EXIT_FAILURE, _("%s: not a directory"), spec);
return EXIT_FAILURE;
}
src = dir_to_device(spec);
if (!src) {
if (!quiet)
printf(_("%s is not a mountpoint\n"), spec);
return EXIT_FAILURE;
}
if (fs_devno)
printf("%u:%u\n", major(src), minor(src));
else if (!quiet)
printf(_("%s is a mountpoint\n"), spec);
}
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
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