File: mount.c

package info (click to toggle)
util-linux 2.34-0.1
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 46,508 kB
  • sloc: ansic: 129,594; sh: 15,590; yacc: 1,170; makefile: 397; xml: 369; python: 316; csh: 37; sed: 16; perl: 15
file content (973 lines) | stat: -rw-r--r-- 26,898 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
/*
 * mount(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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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/mman.h>
#include <sys/stat.h>
#include <stdarg.h>
#include <libmount.h>
#include <ctype.h>

#include "nls.h"
#include "c.h"
#include "env.h"
#include "strutils.h"
#include "closestream.h"
#include "canonicalize.h"

#define XALLOC_EXIT_CODE MNT_EX_SYSERR
#include "xalloc.h"

#define OPTUTILS_EXIT_CODE MNT_EX_USAGE
#include "optutils.h"

/*** TODO: DOCS:
 *
 *  --options-mode={ignore,append,prepend,replace}	MNT_OMODE_{IGNORE, ...}
 *  --options-source={fstab,mtab,disable}		MNT_OMODE_{FSTAB,MTAB,NOTAB}
 *  --options-source-force				MNT_OMODE_FORCE
 */

static int mk_exit_code(struct libmnt_context *cxt, int rc);

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(MNT_EX_USAGE, _("only root can use \"--%s\" option "
					 "(effective UID is %u)"),
					option, euid);
		errx(MNT_EX_USAGE, _("only root can do that "
				 "(effective UID is %u)"), euid);
	}
	if (option)
		errx(MNT_EX_USAGE, _("only root can use \"--%s\" option"), option);
	errx(MNT_EX_USAGE, _("only root can do that"));
}

static void __attribute__((__noreturn__)) mount_print_version(void)
{
	const char *ver = NULL;
	const char **features = NULL, **p;

	mnt_get_library_version(&ver);
	mnt_get_library_features(&features);

	printf(_("%s from %s (libmount %s"),
			program_invocation_short_name,
			PACKAGE_STRING,
			ver);
	p = features;
	while (p && *p) {
		fputs(p == features ? ": " : ", ", stdout);
		fputs(*p++, stdout);
	}
	fputs(")\n", stdout);
	exit(MNT_EX_SUCCESS);
}

static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)),
			const char *filename, int line)
{
	if (filename)
		warnx(_("%s: parse error at line %d -- ignored"), filename, line);
	return 1;
}

/*
 * Replace control chars with '?' to be compatible with coreutils. For more
 * robust solution use findmnt(1) where we use \x?? hex encoding.
 */
static void safe_fputs(const char *data)
{
	const char *p;

	for (p = data; p && *p; p++) {
		if (iscntrl((unsigned char) *p))
			fputc('?', stdout);
		else
			fputc(*p, stdout);
	}
}

static void print_all(struct libmnt_context *cxt, char *pattern, int show_label)
{
	struct libmnt_table *tb;
	struct libmnt_iter *itr = NULL;
	struct libmnt_fs *fs;
	struct libmnt_cache *cache = NULL;

	if (mnt_context_get_mtab(cxt, &tb))
		err(MNT_EX_SYSERR, _("failed to read mtab"));

	itr = mnt_new_iter(MNT_ITER_FORWARD);
	if (!itr)
		err(MNT_EX_SYSERR, _("failed to initialize libmount iterator"));
	if (show_label)
		cache = mnt_new_cache();

	while (mnt_table_next_fs(tb, itr, &fs) == 0) {
		const char *type = mnt_fs_get_fstype(fs);
		const char *src = mnt_fs_get_source(fs);
		const char *optstr = mnt_fs_get_options(fs);
		char *xsrc = NULL;

		if (type && pattern && !mnt_match_fstype(type, pattern))
			continue;

		if (!mnt_fs_is_pseudofs(fs) && !mnt_fs_is_netfs(fs))
			xsrc = mnt_pretty_path(src, cache);
		printf ("%s on ", xsrc ? xsrc : src);
		safe_fputs(mnt_fs_get_target(fs));

		if (type)
			printf (" type %s", type);
		if (optstr)
			printf (" (%s)", optstr);
		if (show_label && src) {
			char *lb = mnt_cache_find_tag_value(cache, src, "LABEL");
			if (lb)
				printf (" [%s]", lb);
		}
		fputc('\n', stdout);
		free(xsrc);
	}

	mnt_unref_cache(cache);
	mnt_free_iter(itr);
}

/*
 * mount -a [-F]
 */
static int mount_all(struct libmnt_context *cxt)
{
	struct libmnt_iter *itr;
	struct libmnt_fs *fs;
	int mntrc, ignored, rc = MNT_EX_SUCCESS;

	int nsucc = 0, nerrs = 0;

	itr = mnt_new_iter(MNT_ITER_FORWARD);
	if (!itr) {
		warn(_("failed to initialize libmount iterator"));
		return MNT_EX_SYSERR;
	}

	while (mnt_context_next_mount(cxt, itr, &fs, &mntrc, &ignored) == 0) {

		const char *tgt = mnt_fs_get_target(fs);

		if (ignored) {
			if (mnt_context_is_verbose(cxt))
				printf(ignored == 1 ? _("%-25s: ignored\n") :
						      _("%-25s: already mounted\n"),
						tgt);
		} else if (mnt_context_is_fork(cxt)) {
			if (mnt_context_is_verbose(cxt))
				printf("%-25s: mount successfully forked\n", tgt);
		} else {
			if (mk_exit_code(cxt, mntrc) == MNT_EX_SUCCESS) {
				nsucc++;

				/* Note that MNT_EX_SUCCESS return code does
				 * not mean that FS has been really mounted
				 * (e.g. nofail option) */
				if (mnt_context_get_status(cxt) 
				    && mnt_context_is_verbose(cxt))
					printf("%-25s: successfully mounted\n", tgt);
			} else
				nerrs++;
		}
	}

	if (mnt_context_is_parent(cxt)) {
		/* wait for mount --fork children */
		int nchildren = 0;

		nerrs = 0, nsucc = 0;

		rc = mnt_context_wait_for_children(cxt, &nchildren, &nerrs);
		if (!rc && nchildren)
			nsucc = nchildren - nerrs;
	}

	if (nerrs == 0)
		rc = MNT_EX_SUCCESS;		/* all success */
	else if (nsucc == 0)
		rc = MNT_EX_FAIL;		/* all failed */
	else
		rc = MNT_EX_SOMEOK;		/* some success, some failed */

	mnt_free_iter(itr);
	return rc;
}


/*
 * mount -a -o remount
 */
static int remount_all(struct libmnt_context *cxt)
{
	struct libmnt_iter *itr;
	struct libmnt_fs *fs;
	int mntrc, ignored, rc = MNT_EX_SUCCESS;

	int nsucc = 0, nerrs = 0;

	itr = mnt_new_iter(MNT_ITER_FORWARD);
	if (!itr) {
		warn(_("failed to initialize libmount iterator"));
		return MNT_EX_SYSERR;
	}

	while (mnt_context_next_remount(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 (mk_exit_code(cxt, mntrc) == MNT_EX_SUCCESS) {
				nsucc++;

				/* Note that MNT_EX_SUCCESS return code does
				 * not mean that FS has been really mounted
				 * (e.g. nofail option) */
				if (mnt_context_get_status(cxt)
				    && mnt_context_is_verbose(cxt))
					printf("%-25s: successfully remounted\n", tgt);
			} else
				nerrs++;
		}
	}

	if (nerrs == 0)
		rc = MNT_EX_SUCCESS;		/* all success */
	else if (nsucc == 0)
		rc = MNT_EX_FAIL;		/* all failed */
	else
		rc = MNT_EX_SOMEOK;		/* some success, some failed */

	mnt_free_iter(itr);
	return rc;
}

static void success_message(struct libmnt_context *cxt)
{
	unsigned long mflags = 0;
	const char *tgt, *src, *pr = program_invocation_short_name;

	if (mnt_context_helper_executed(cxt)
	    || mnt_context_get_status(cxt) != 1)
		return;

	mnt_context_get_mflags(cxt, &mflags);
	tgt = mnt_context_get_target(cxt);
	src = mnt_context_get_source(cxt);

	if (mflags & MS_MOVE)
		printf(_("%s: %s moved to %s.\n"), pr, src, tgt);
	else if (mflags & MS_BIND)
		printf(_("%s: %s bound on %s.\n"), pr, src, tgt);
	else if (mflags & MS_PROPAGATION) {
		if (src && strcmp(src, "none") != 0 && tgt)
			printf(_("%s: %s mounted on %s.\n"), pr, src, tgt);

		printf(_("%s: %s propagation flags changed.\n"), pr, tgt);
	} else
		printf(_("%s: %s mounted on %s.\n"), pr, src, tgt);
}

#if defined(HAVE_LIBSELINUX) && defined(HAVE_SECURITY_GET_INITIAL_CONTEXT)
#include <selinux/selinux.h>
#include <selinux/context.h>

static void selinux_warning(struct libmnt_context *cxt, const char *tgt)
{

	if (tgt && mnt_context_is_verbose(cxt) && is_selinux_enabled() > 0) {
		security_context_t raw = NULL, def = NULL;

		if (getfilecon(tgt, &raw) > 0
		    && security_get_initial_context("file", &def) == 0) {

		if (!selinux_file_context_cmp(raw, def))
			printf(_(
	"mount: %s does not contain SELinux labels.\n"
	"       You just mounted an file system that supports labels which does not\n"
	"       contain labels, onto an SELinux box. It is likely that confined\n"
	"       applications will generate AVC messages and not be allowed access to\n"
	"       this file system.  For more details see restorecon(8) and mount(8).\n"),
				tgt);
		}
		freecon(raw);
		freecon(def);
	}
}
#else
# define selinux_warning(_x, _y)
#endif

/*
 * Returns exit status (MNT_EX_*) and/or prints error message.
 */
static int mk_exit_code(struct libmnt_context *cxt, int rc)
{
	const char *tgt;
	char buf[BUFSIZ] = { 0 };

	rc = mnt_context_get_excode(cxt, rc, buf, sizeof(buf));
	tgt = mnt_context_get_target(cxt);

	if (*buf) {
		const char *spec = tgt;
		if (!spec)
			spec = mnt_context_get_source(cxt);
		if (!spec)
			spec = "???";
		warnx("%s: %s.", spec, buf);
	}

	if (rc == MNT_EX_SUCCESS && mnt_context_get_status(cxt) == 1) {
		selinux_warning(cxt, tgt);
	}
	return rc;
}

static struct libmnt_table *append_fstab(struct libmnt_context *cxt,
					 struct libmnt_table *fstab,
					 const char *path)
{

	if (!fstab) {
		fstab = mnt_new_table();
		if (!fstab)
			err(MNT_EX_SYSERR, _("failed to initialize libmount table"));

		mnt_table_set_parser_errcb(fstab, table_parser_errcb);
		mnt_context_set_fstab(cxt, fstab);

		mnt_unref_table(fstab);	/* reference is handled by @cxt now */
	}

	if (mnt_table_parse_fstab(fstab, path))
		errx(MNT_EX_USAGE,_("%s: failed to parse"), path);

	return fstab;
}

/*
 * Check source and target paths -- non-root user should not be able to
 * resolve paths which are unreadable for him.
 */
static void sanitize_paths(struct libmnt_context *cxt)
{
	const char *p;
	struct libmnt_fs *fs = mnt_context_get_fs(cxt);

	if (!fs)
		return;

	p = mnt_fs_get_target(fs);
	if (p) {
		char *np = canonicalize_path_restricted(p);
		if (!np)
			err(MNT_EX_USAGE, "%s", p);
		mnt_fs_set_target(fs, np);
		free(np);
	}

	p = mnt_fs_get_srcpath(fs);
	if (p) {
		char *np = canonicalize_path_restricted(p);
		if (!np)
			err(MNT_EX_USAGE, "%s", p);
		mnt_fs_set_source(fs, np);
		free(np);
	}
}

static void append_option(struct libmnt_context *cxt, const char *opt)
{
	if (opt && (*opt == '=' || *opt == '\'' || *opt == '\"' || isblank(*opt)))
		errx(MNT_EX_USAGE, _("unsupported option format: %s"), opt);
	if (mnt_context_append_options(cxt, opt))
		err(MNT_EX_SYSERR, _("failed to append option '%s'"), opt);
}

static int has_remount_flag(struct libmnt_context *cxt)
{
	unsigned long mflags = 0;

	if (mnt_context_get_mflags(cxt, &mflags))
		return 0;

	return mflags & MS_REMOUNT;
}

static void __attribute__((__noreturn__)) usage(void)
{
	FILE *out = stdout;
	fputs(USAGE_HEADER, out);
	fprintf(out, _(
		" %1$s [-lhV]\n"
		" %1$s -a [options]\n"
		" %1$s [options] [--source] <source> | [--target] <directory>\n"
		" %1$s [options] <source> <directory>\n"
		" %1$s <operation> <mountpoint> [<target>]\n"),
		program_invocation_short_name);

	fputs(USAGE_SEPARATOR, out);
	fputs(_("Mount a filesystem.\n"), out);

	fputs(USAGE_OPTIONS, out);
	fprintf(out, _(
	" -a, --all               mount all filesystems mentioned in fstab\n"
	" -c, --no-canonicalize   don't canonicalize paths\n"
	" -f, --fake              dry run; skip the mount(2) syscall\n"
	" -F, --fork              fork off for each device (use with -a)\n"
	" -T, --fstab <path>      alternative file to /etc/fstab\n"));
	fprintf(out, _(
	" -i, --internal-only     don't call the mount.<type> helpers\n"));
	fprintf(out, _(
	" -l, --show-labels       show also filesystem labels\n"));
	fprintf(out, _(
	" -n, --no-mtab           don't write to /etc/mtab\n"));
	fprintf(out, _(
	"     --options-mode <mode>\n"
	"                         what to do with options loaded from fstab\n"
	"     --options-source <source>\n"
	"                         mount options source\n"
	"     --options-source-force\n"
	"                         force use of options from fstab/mtab\n"));
	fprintf(out, _(
	" -o, --options <list>    comma-separated list of mount options\n"
	" -O, --test-opts <list>  limit the set of filesystems (use with -a)\n"
	" -r, --read-only         mount the filesystem read-only (same as -o ro)\n"
	" -t, --types <list>      limit the set of filesystem types\n"));
	fprintf(out, _(
	"     --source <src>      explicitly specifies source (path, label, uuid)\n"
	"     --target <target>   explicitly specifies mountpoint\n"));
	fprintf(out, _(
	" -v, --verbose           say what is being done\n"));
	fprintf(out, _(
	" -w, --rw, --read-write  mount the filesystem read-write (default)\n"));
	fprintf(out, _(
	" -N, --namespace <ns>    perform mount in another namespace\n"));

	fputs(USAGE_SEPARATOR, out);
	printf(USAGE_HELP_OPTIONS(25));

	fprintf(out, _(
	"\nSource:\n"
	" -L, --label <label>     synonym for LABEL=<label>\n"
	" -U, --uuid <uuid>       synonym for UUID=<uuid>\n"
	" LABEL=<label>           specifies device by filesystem label\n"
	" UUID=<uuid>             specifies device by filesystem UUID\n"
	" PARTLABEL=<label>       specifies device by partition label\n"
	" PARTUUID=<uuid>         specifies device by partition UUID\n"));

	fprintf(out, _(
	" <device>                specifies device by path\n"
	" <directory>             mountpoint for bind mounts (see --bind/rbind)\n"
	" <file>                  regular file for loopdev setup\n"));

	fprintf(out, _(
	"\nOperations:\n"
	" -B, --bind              mount a subtree somewhere else (same as -o bind)\n"
	" -M, --move              move a subtree to some other place\n"
	" -R, --rbind             mount a subtree and all submounts somewhere else\n"));
	fprintf(out, _(
	" --make-shared           mark a subtree as shared\n"
	" --make-slave            mark a subtree as slave\n"
	" --make-private          mark a subtree as private\n"
	" --make-unbindable       mark a subtree as unbindable\n"));
	fprintf(out, _(
	" --make-rshared          recursively mark a whole subtree as shared\n"
	" --make-rslave           recursively mark a whole subtree as slave\n"
	" --make-rprivate         recursively mark a whole subtree as private\n"
	" --make-runbindable      recursively mark a whole subtree as unbindable\n"));

	printf(USAGE_MAN_TAIL("mount(8)"));

	exit(MNT_EX_SUCCESS);
}

struct flag_str {
	int value;
	char *str;
};

static int omode2mask(const char *str)
{
	size_t i;

	static const struct flag_str flags[] = {
		{ MNT_OMODE_IGNORE, "ignore" },
		{ MNT_OMODE_APPEND, "append" },
		{ MNT_OMODE_PREPEND, "prepend" },
		{ MNT_OMODE_REPLACE, "replace" },
	};

	for (i = 0; i < ARRAY_SIZE(flags); i++) {
		if (!strcmp(str, flags[i].str))
			return flags[i].value;
	}
	return -EINVAL;
}

static long osrc2mask(const char *str, size_t len)
{
	size_t i;

	static const struct flag_str flags[] = {
		{ MNT_OMODE_FSTAB, "fstab" },
		{ MNT_OMODE_MTAB, "mtab" },
		{ MNT_OMODE_NOTAB, "disable" },
	};

	for (i = 0; i < ARRAY_SIZE(flags); i++) {
		if (!strncmp(str, flags[i].str, len) && !flags[i].str[len])
			return flags[i].value;
	}
	return -EINVAL;
}

static pid_t parse_pid(const char *str)
{
	char *end;
	pid_t ret;

	errno = 0;
	ret = strtoul(str, &end, 10);

	if (ret < 0 || errno || end == str || (end && *end))
		return 0;
	return ret;
}

int main(int argc, char **argv)
{
	int c, rc = MNT_EX_SUCCESS, all = 0, show_labels = 0;
	struct libmnt_context *cxt;
	struct libmnt_table *fstab = NULL;
	char *srcbuf = NULL;
	char *types = NULL;
	int oper = 0, is_move = 0;
	int propa = 0;
	int optmode = 0, optmode_mode = 0, optmode_src = 0;

	enum {
		MOUNT_OPT_SHARED = CHAR_MAX + 1,
		MOUNT_OPT_SLAVE,
		MOUNT_OPT_PRIVATE,
		MOUNT_OPT_UNBINDABLE,
		MOUNT_OPT_RSHARED,
		MOUNT_OPT_RSLAVE,
		MOUNT_OPT_RPRIVATE,
		MOUNT_OPT_RUNBINDABLE,
		MOUNT_OPT_TARGET,
		MOUNT_OPT_SOURCE,
		MOUNT_OPT_OPTMODE,
		MOUNT_OPT_OPTSRC,
		MOUNT_OPT_OPTSRC_FORCE
	};

	static const struct option longopts[] = {
		{ "all",              no_argument,       NULL, 'a'                   },
		{ "fake",             no_argument,       NULL, 'f'                   },
		{ "fstab",            required_argument, NULL, 'T'                   },
		{ "fork",             no_argument,       NULL, 'F'                   },
		{ "help",             no_argument,       NULL, 'h'                   },
		{ "no-mtab",          no_argument,       NULL, 'n'                   },
		{ "read-only",        no_argument,       NULL, 'r'                   },
		{ "ro",               no_argument,       NULL, 'r'                   },
		{ "verbose",          no_argument,       NULL, 'v'                   },
		{ "version",          no_argument,       NULL, 'V'                   },
		{ "read-write",       no_argument,       NULL, 'w'                   },
		{ "rw",               no_argument,       NULL, 'w'                   },
		{ "options",          required_argument, NULL, 'o'                   },
		{ "test-opts",        required_argument, NULL, 'O'                   },
		{ "types",            required_argument, NULL, 't'                   },
		{ "uuid",             required_argument, NULL, 'U'                   },
		{ "label",            required_argument, NULL, 'L'                   },
		{ "bind",             no_argument,       NULL, 'B'                   },
		{ "move",             no_argument,       NULL, 'M'                   },
		{ "rbind",            no_argument,       NULL, 'R'                   },
		{ "make-shared",      no_argument,       NULL, MOUNT_OPT_SHARED      },
		{ "make-slave",       no_argument,       NULL, MOUNT_OPT_SLAVE       },
		{ "make-private",     no_argument,       NULL, MOUNT_OPT_PRIVATE     },
		{ "make-unbindable",  no_argument,       NULL, MOUNT_OPT_UNBINDABLE  },
		{ "make-rshared",     no_argument,       NULL, MOUNT_OPT_RSHARED     },
		{ "make-rslave",      no_argument,       NULL, MOUNT_OPT_RSLAVE      },
		{ "make-rprivate",    no_argument,       NULL, MOUNT_OPT_RPRIVATE    },
		{ "make-runbindable", no_argument,       NULL, MOUNT_OPT_RUNBINDABLE },
		{ "no-canonicalize",  no_argument,       NULL, 'c'                   },
		{ "internal-only",    no_argument,       NULL, 'i'                   },
		{ "show-labels",      no_argument,       NULL, 'l'                   },
		{ "target",           required_argument, NULL, MOUNT_OPT_TARGET      },
		{ "source",           required_argument, NULL, MOUNT_OPT_SOURCE      },
		{ "options-mode",     required_argument, NULL, MOUNT_OPT_OPTMODE     },
		{ "options-source",   required_argument, NULL, MOUNT_OPT_OPTSRC      },
		{ "options-source-force",   no_argument, NULL, MOUNT_OPT_OPTSRC_FORCE},
		{ "namespace",        required_argument, NULL, 'N'                   },
		{ NULL, 0, NULL, 0 }
	};

	static const ul_excl_t excl[] = {       /* rows and cols in ASCII order */
		{ 'B','M','R' },			/* bind,move,rbind */
		{ 'L','U', MOUNT_OPT_SOURCE },	/* label,uuid,source */
		{ 0 }
	};
	int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;

	sanitize_env();
	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	close_stdout_atexit();

	strutils_set_exitcode(MNT_EX_USAGE);

	mnt_init_debug(0);
	cxt = mnt_new_context();
	if (!cxt)
		err(MNT_EX_SYSERR, _("libmount context allocation failed"));

	mnt_context_set_tables_errcb(cxt, table_parser_errcb);

	while ((c = getopt_long(argc, argv, "aBcfFhilL:Mno:O:rRsU:vVwt:T:N:",
					longopts, NULL)) != -1) {

		/* only few options are allowed for non-root users */
		if (mnt_context_is_restricted(cxt) &&
		    !strchr("hlLUVvrist", c) &&
		    c != MOUNT_OPT_TARGET &&
		    c != MOUNT_OPT_SOURCE)
			exit_non_root(option_to_longopt(c, longopts));

		err_exclusive_options(c, longopts, excl, excl_st);

		switch(c) {
		case 'a':
			all = 1;
			break;
		case 'c':
			mnt_context_disable_canonicalize(cxt, TRUE);
			break;
		case 'f':
			mnt_context_enable_fake(cxt, TRUE);
			break;
		case 'F':
			mnt_context_enable_fork(cxt, TRUE);
			break;
		case 'i':
			mnt_context_disable_helpers(cxt, TRUE);
			break;
		case 'n':
			mnt_context_disable_mtab(cxt, TRUE);
			break;
		case 'r':
			append_option(cxt, "ro");
			mnt_context_enable_rwonly_mount(cxt, FALSE);
			break;
		case 'v':
			mnt_context_enable_verbose(cxt, TRUE);
			break;
		case 'w':
			append_option(cxt, "rw");
			mnt_context_enable_rwonly_mount(cxt, TRUE);
			break;
		case 'o':
			append_option(cxt, optarg);
			break;
		case 'O':
			if (mnt_context_set_options_pattern(cxt, optarg))
				err(MNT_EX_SYSERR, _("failed to set options pattern"));
			break;
		case 'L':
			xasprintf(&srcbuf, "LABEL=\"%s\"", optarg);
			mnt_context_disable_swapmatch(cxt, 1);
			mnt_context_set_source(cxt, srcbuf);
			free(srcbuf);
			break;
		case 'U':
			xasprintf(&srcbuf, "UUID=\"%s\"", optarg);
			mnt_context_disable_swapmatch(cxt, 1);
			mnt_context_set_source(cxt, srcbuf);
			free(srcbuf);
			break;
		case 'l':
			show_labels = 1;
			break;
		case 't':
			types = optarg;
			break;
		case 'T':
			fstab = append_fstab(cxt, fstab, optarg);
			break;
		case 's':
			mnt_context_enable_sloppy(cxt, TRUE);
			break;
		case 'B':
			oper = 1;
			append_option(cxt, "bind");
			break;
		case 'M':
			oper = 1;
			is_move = 1;
			break;
		case 'R':
			oper = 1;
			append_option(cxt, "rbind");
			break;
		case 'N':
		{
			char path[PATH_MAX];
			pid_t pid = parse_pid(optarg);

			if (pid)
				snprintf(path, sizeof(path), "/proc/%i/ns/mnt", pid);

			if (mnt_context_set_target_ns(cxt, pid ? path : optarg))
				err(MNT_EX_SYSERR, _("failed to set target namespace to %s"), pid ? path : optarg);
			break;
		}
		case MOUNT_OPT_SHARED:
			append_option(cxt, "shared");
			propa = 1;
			break;
		case MOUNT_OPT_SLAVE:
			append_option(cxt, "slave");
			propa = 1;
			break;
		case MOUNT_OPT_PRIVATE:
			append_option(cxt, "private");
			propa = 1;
			break;
		case MOUNT_OPT_UNBINDABLE:
			append_option(cxt, "unbindable");
			propa = 1;
			break;
		case MOUNT_OPT_RSHARED:
			append_option(cxt, "rshared");
			propa = 1;
			break;
		case MOUNT_OPT_RSLAVE:
			append_option(cxt, "rslave");
			propa = 1;
			break;
		case MOUNT_OPT_RPRIVATE:
			append_option(cxt, "rprivate");
			propa = 1;
			break;
		case MOUNT_OPT_RUNBINDABLE:
			append_option(cxt, "runbindable");
			propa = 1;
			break;
		case MOUNT_OPT_TARGET:
			mnt_context_disable_swapmatch(cxt, 1);
			mnt_context_set_target(cxt, optarg);
			break;
		case MOUNT_OPT_SOURCE:
			mnt_context_disable_swapmatch(cxt, 1);
			mnt_context_set_source(cxt, optarg);
			break;
		case MOUNT_OPT_OPTMODE:
			optmode_mode = omode2mask(optarg);
			if (optmode_mode == -EINVAL) {
				warnx(_("bad usage"));
				errtryhelp(MNT_EX_USAGE);
			}
			break;
		case MOUNT_OPT_OPTSRC:
		{
			unsigned long tmp = 0;
			if (string_to_bitmask(optarg, &tmp, osrc2mask)) {
				warnx(_("bad usage"));
				errtryhelp(MNT_EX_USAGE);
			}
			optmode_src = tmp;
			break;
		}
		case MOUNT_OPT_OPTSRC_FORCE:
			optmode |= MNT_OMODE_FORCE;
			break;

		case 'h':
			mnt_free_context(cxt);
			usage();
		case 'V':
			mnt_free_context(cxt);
			mount_print_version();
		default:
			errtryhelp(MNT_EX_USAGE);
		}
	}

	argc -= optind;
	argv += optind;

	optmode |= optmode_mode | optmode_src;
	if (optmode) {
		if (!optmode_mode)
			optmode |= MNT_OMODE_PREPEND;
		if (!optmode_src)
			optmode |= MNT_OMODE_FSTAB | MNT_OMODE_MTAB;
		mnt_context_set_optsmode(cxt, optmode);
	}

	if (fstab && !mnt_context_is_nocanonicalize(cxt)) {
		/*
		 * We have external (context independent) fstab instance, let's
		 * make a connection between the fstab and the canonicalization
		 * cache.
		 */
		mnt_table_set_cache(fstab, mnt_context_get_cache(cxt));
	}

	if (!mnt_context_get_source(cxt) &&
	    !mnt_context_get_target(cxt) &&
	    !argc &&
	    !all) {
		if (oper || mnt_context_get_options(cxt)) {
			warnx(_("bad usage"));
			errtryhelp(MNT_EX_USAGE);
		}
		print_all(cxt, types, show_labels);
		goto done;
	}

	/* Non-root users are allowed to use -t to print_all(),
	   but not to mount */
	if (mnt_context_is_restricted(cxt) && types)
		exit_non_root("types");

	if (oper && (types || all || mnt_context_get_source(cxt))) {
		warnx(_("bad usage"));
		errtryhelp(MNT_EX_USAGE);
	}

	if (types && (all || strchr(types, ',') ||
			     strncmp(types, "no", 2) == 0))
		mnt_context_set_fstype_pattern(cxt, types);
	else if (types)
		mnt_context_set_fstype(cxt, types);

	if (all) {
		/*
		 * A) Mount all
		 */
		if (has_remount_flag(cxt))
			rc = remount_all(cxt);
		else
			rc = mount_all(cxt);
		goto done;

	} else if (argc == 0 && (mnt_context_get_source(cxt) ||
				 mnt_context_get_target(cxt))) {
		/*
		 * B) mount -L|-U|--source|--target
		 *
		 * non-root may specify source *or* target, but not both
		 */
		if (mnt_context_is_restricted(cxt) &&
		    mnt_context_get_source(cxt) &&
		    mnt_context_get_target(cxt))
			exit_non_root(NULL);

	} else if (argc == 1 && (!mnt_context_get_source(cxt) ||
				 !mnt_context_get_target(cxt))) {
		/*
		 * C) mount [-L|-U|--source] <target>
		 *    mount [--target <dir>] <source>
		 *    mount <source|target>
		 *
		 * non-root may specify source *or* target, but not both
		 *
		 * It does not matter for libmount if we set source or target
		 * here (the library is able to swap it), but it matters for
		 * sanitize_paths().
		 */
		int istag = mnt_tag_is_valid(argv[0]);

		if (istag && mnt_context_get_source(cxt))
			/* -L, -U or --source together with LABEL= or UUID= */
			errx(MNT_EX_USAGE, _("source specified more than once"));
		else if (istag || mnt_context_get_target(cxt))
			mnt_context_set_source(cxt, argv[0]);
		else
			mnt_context_set_target(cxt, argv[0]);

		if (mnt_context_is_restricted(cxt) &&
		    mnt_context_get_source(cxt) &&
		    mnt_context_get_target(cxt))
			exit_non_root(NULL);

	} else if (argc == 2 && !mnt_context_get_source(cxt)
			     && !mnt_context_get_target(cxt)) {
		/*
		 * D) mount <source> <target>
		 */
		if (mnt_context_is_restricted(cxt))
			exit_non_root(NULL);

		mnt_context_set_source(cxt, argv[0]);
		mnt_context_set_target(cxt, argv[1]);

	} else {
		warnx(_("bad usage"));
		errtryhelp(MNT_EX_USAGE);
	}

	if (mnt_context_is_restricted(cxt))
		sanitize_paths(cxt);

	if (is_move)
		/* "move" as option string is not supported by libmount */
		mnt_context_set_mflags(cxt, MS_MOVE);

	if ((oper && !has_remount_flag(cxt)) || propa)
		/* For --make-* or --bind is fstab/mtab unnecessary */
		mnt_context_set_optsmode(cxt, MNT_OMODE_NOTAB);

	rc = mnt_context_mount(cxt);
	rc = mk_exit_code(cxt, rc);

	if (rc == MNT_EX_SUCCESS && mnt_context_is_verbose(cxt))
		success_message(cxt);
done:
	mnt_free_context(cxt);
	return rc;
}