/*
* umount(8) -- mount a filesystem
*
* 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 <libmount.h>
#include "nls.h"
#include "c.h"
#include "env.h"
#include "optutils.h"
static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)),
const char *filename, int line)
{
if (filename)
warnx(_("%s: parse error: ignore entry at line %d."),
filename, line);
return 0;
}
static void __attribute__((__noreturn__)) print_version(void)
{
const char *ver = NULL;
mnt_get_library_version(&ver);
printf(_("%s from %s (libmount %s)\n"),
program_invocation_short_name, PACKAGE_STRING, ver);
exit(EXIT_SUCCESS);
}
static void __attribute__((__noreturn__)) usage(FILE *out)
{
fputs(USAGE_HEADER, out);
fprintf(out, _(
" %1$s [-hV]\n"
" %1$s -a [options]\n"
" %1$s [options] <source> | <directory>\n"),
program_invocation_short_name);
fputs(USAGE_OPTIONS, out);
fprintf(out, _(
" -a, --all mount all filesystems mentioned in fstab\n"
" -c, --no-canonicalize don't canonicalize paths\n"
" -d, --detach-loop if mounted loop device, also free this loop device\n"
" --fake dry run; skip the umount(2) syscall\n"
" -f, --force force unmount (in case of an unreachable NFS system)\n"));
fprintf(out, _(
" -i, --internal-only don't call the umount.<type> helpers\n"
" -n, --no-mtab don't write to /etc/mtab\n"
" -l, --lazy detach the filesystem now, and cleanup all later\n"));
fprintf(out, _(
" -O, --test-opts <list> limit the set of filesystems (use with -a)\n"
" -r, --read-only In case unmounting fails, try to remount read-only\n"
" -t, --types <list> limit the set of filesystem types\n"
" -v, --verbose say what is being done\n"));
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("umount(8)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
static void __attribute__((__noreturn__)) exit_non_root(const char *option)
{
const uid_t ruid = getuid();
const uid_t euid = geteuid();
if (ruid == 0 && euid != 0) {
/* user is root, but setuid to non-root */
if (option)
errx(EXIT_FAILURE,
_("only root can use \"--%s\" option "
"(effective UID is %u)"),
option, euid);
errx(EXIT_FAILURE, _("only root can do that "
"(effective UID is %u)"), euid);
}
if (option)
errx(EXIT_FAILURE, _("only root can use \"--%s\" option"), option);
errx(EXIT_FAILURE, _("only root can do that"));
}
static int umount_all(struct libmnt_context *cxt)
{
struct libmnt_iter *itr;
struct libmnt_fs *fs;
int mntrc, ignored, rc = 0;
itr = mnt_new_iter(MNT_ITER_BACKWARD);
if (!itr) {
warn(_("failed to initialize libmount iterator"));
return -ENOMEM;
}
while (mnt_context_next_umount(cxt, itr, &fs, &mntrc, &ignored) == 0) {
const char *tgt = mnt_fs_get_target(fs);
if (ignored) {
if (mnt_context_is_verbose(cxt))
printf(_("%-25s: ignored\n"), tgt);
} else if (!mnt_context_get_status(cxt)) {
if (mntrc > 0) {
errno = mntrc;
printf(_("%-25s: failed: %s\n"), tgt,
strerror(mntrc));
} else
printf(_("%-25s: failed\n"), tgt);
rc |= 1;
} else {
if (mnt_context_is_verbose(cxt))
printf("%-25s: successfully umounted\n", tgt);
rc |= 0;
}
}
return rc;
}
static int umount_one(struct libmnt_context *cxt, const char *spec)
{
int rc;
if (!spec)
return -EINVAL;
if (mnt_context_set_target(cxt, spec))
err(EXIT_FAILURE, _("failed to set umount target"));
rc = mnt_context_umount(cxt);
if (rc)
/* TODO mnt_context_strerror() */
warnx(_("%s: umount failed"), spec);
mnt_reset_context(cxt);
return rc;
}
int main(int argc, char **argv)
{
int c, rc = 0, all = 0;
struct libmnt_context *cxt;
char *types = NULL;
enum {
UMOUNT_OPT_FAKE = CHAR_MAX + 1,
};
static const struct option longopts[] = {
{ "all", 0, 0, 'a' },
{ "detach-loop", 0, 0, 'd' },
{ "fake", 0, 0, UMOUNT_OPT_FAKE },
{ "force", 0, 0, 'f' },
{ "help", 0, 0, 'h' },
{ "internal-only", 0, 0, 'i' },
{ "lazy", 0, 0, 'l' },
{ "no-canonicalize", 0, 0, 'c' },
{ "no-mtab", 0, 0, 'n' },
{ "read-only", 0, 0, 'r' },
{ "test-opts", 1, 0, 'O' },
{ "types", 1, 0, 't' },
{ "verbose", 0, 0, 'v' },
{ "version", 0, 0, 'V' },
{ NULL, 0, 0, 0 }
};
sanitize_env();
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
mnt_init_debug(0);
cxt = mnt_new_context();
if (!cxt)
err(EXIT_FAILURE, _("libmount context allocation failed"));
mnt_context_set_tables_errcb(cxt, table_parser_errcb);
while ((c = getopt_long(argc, argv, "acdfhilnrO:t:vV",
longopts, NULL)) != -1) {
/* only few options are allowed for non-root users */
if (mnt_context_is_restricted(cxt) && !strchr("hdilVv", c))
exit_non_root(option_to_longopt(c, longopts));
switch(c) {
case 'a':
all = 1;
break;
case 'c':
mnt_context_disable_canonicalize(cxt, TRUE);
break;
case 'd':
mnt_context_enable_loopdel(cxt, TRUE);
break;
case UMOUNT_OPT_FAKE:
mnt_context_enable_fake(cxt, TRUE);
break;
case 'f':
mnt_context_enable_force(cxt, TRUE);
break;
case 'h':
usage(stdout);
break;
case 'i':
mnt_context_disable_helpers(cxt, TRUE);
break;
case 'l':
mnt_context_enable_lazy(cxt, TRUE);
break;
case 'n':
mnt_context_disable_mtab(cxt, TRUE);
break;
case 'r':
mnt_context_enable_rdonly_umount(cxt, TRUE);
break;
case 'O':
if (mnt_context_set_options_pattern(cxt, optarg))
err(EXIT_FAILURE, _("failed to set options pattern"));
break;
case 't':
types = optarg;
break;
case 'v':
mnt_context_enable_verbose(cxt, TRUE);
break;
case 'V':
print_version();
break;
default:
usage(stderr);
break;
}
}
argc -= optind;
argv += optind;
if (all) {
if (!types)
types = "noproc,nodevfs,nodevpts,nosysfs,norpc_pipefs,nonfsd";
mnt_context_set_fstype_pattern(cxt, types);
rc = umount_all(cxt);
} else if (argc < 1) {
usage(stderr);
} else while (argc--) {
rc += umount_one(cxt, *argv++);
}
mnt_free_context(cxt);
return rc ? EXIT_FAILURE : EXIT_SUCCESS;
}
