1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2001 Dima Dorfman.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 /*
30 * mdmfs (md/MFS) is a wrapper around mdconfig(8),
31 * newfs(8), and mount(8) that mimics the command line option set of
32 * the deprecated mount_mfs(8).
33 */
34
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37
38 #include <sys/param.h>
39 #include <sys/linker.h>
40 #include <sys/mdioctl.h>
41 #include <sys/module.h>
42 #include <sys/mount.h>
43 #include <sys/stat.h>
44 #include <sys/wait.h>
45
46 #include <assert.h>
47 #include <err.h>
48 #include <errno.h>
49 #include <fcntl.h>
50 #include <grp.h>
51 #include <inttypes.h>
52 #include <paths.h>
53 #include <pwd.h>
54 #include <stdarg.h>
55 #include <stdio.h>
56 #include <stdlib.h>
57 #include <string.h>
58 #include <ctype.h>
59 #include <unistd.h>
60
61 typedef enum { false, true } bool;
62
63 struct mtpt_info {
64 uid_t mi_uid;
65 bool mi_have_uid;
66 gid_t mi_gid;
67 bool mi_have_gid;
68 mode_t mi_mode;
69 bool mi_have_mode;
70 bool mi_forced_pw;
71 };
72
73 static bool debug; /* Emit debugging information? */
74 static bool loudsubs; /* Suppress output from helper programs? */
75 static bool norun; /* Actually run the helper programs? */
76 static int unit; /* The unit we're working with. */
77 static const char *mdname; /* Name of memory disk device (e.g., "md"). */
78 static const char *mdsuffix; /* Suffix of memory disk device (e.g., ".uzip"). */
79 static size_t mdnamelen; /* Length of mdname. */
80 static const char *path_mdconfig =_PATH_MDCONFIG;
81
82 static void argappend(char **, const char *, ...) __printflike(2, 3);
83 static void debugprintf(const char *, ...) __printflike(1, 2);
84 static void do_mdconfig_attach(const char *, const enum md_types);
85 static void do_mdconfig_attach_au(const char *, const enum md_types);
86 static void do_mdconfig_detach(void);
87 static void do_mount_md(const char *, const char *);
88 static void do_mount_tmpfs(const char *, const char *);
89 static void do_mtptsetup(const char *, struct mtpt_info *);
90 static void do_newfs(const char *);
91 static void extract_ugid(const char *, struct mtpt_info *);
92 static int run(int *, const char *, ...) __printflike(2, 3);
93 static void usage(void);
94
95 int
main(int argc,char ** argv)96 main(int argc, char **argv)
97 {
98 struct mtpt_info mi; /* Mountpoint info. */
99 intmax_t mdsize;
100 char *mdconfig_arg, *newfs_arg, /* Args to helper programs. */
101 *mount_arg;
102 enum md_types mdtype; /* The type of our memory disk. */
103 bool have_mdtype, mlmac;
104 bool detach, softdep, autounit, newfs;
105 const char *mtpoint, *size_arg, *unitstr;
106 char *p;
107 int ch, idx;
108 void *set;
109 unsigned long ul;
110
111 /* Misc. initialization. */
112 (void)memset(&mi, '\0', sizeof(mi));
113 detach = true;
114 softdep = true;
115 autounit = false;
116 mlmac = false;
117 newfs = true;
118 have_mdtype = false;
119 mdtype = MD_SWAP;
120 mdname = MD_NAME;
121 mdnamelen = strlen(mdname);
122 mdsize = 0;
123 /*
124 * Can't set these to NULL. They may be passed to the
125 * respective programs without modification. I.e., we may not
126 * receive any command-line options which will caused them to
127 * be modified.
128 */
129 mdconfig_arg = strdup("");
130 newfs_arg = strdup("");
131 mount_arg = strdup("");
132 size_arg = NULL;
133
134 /* If we were started as mount_mfs or mfs, imply -C. */
135 if (strcmp(getprogname(), "mount_mfs") == 0 ||
136 strcmp(getprogname(), "mfs") == 0) {
137 /* Make compatibility assumptions. */
138 mi.mi_mode = 01777;
139 mi.mi_have_mode = true;
140 }
141
142 while ((ch = getopt(argc, argv,
143 "a:b:Cc:Dd:E:e:F:f:hi:LlMm:NnO:o:Pp:Ss:tT:Uv:w:X")) != -1)
144 switch (ch) {
145 case 'a':
146 argappend(&newfs_arg, "-a %s", optarg);
147 break;
148 case 'b':
149 argappend(&newfs_arg, "-b %s", optarg);
150 break;
151 case 'C':
152 /* Ignored for compatibility. */
153 break;
154 case 'c':
155 argappend(&newfs_arg, "-c %s", optarg);
156 break;
157 case 'D':
158 detach = false;
159 break;
160 case 'd':
161 argappend(&newfs_arg, "-d %s", optarg);
162 break;
163 case 'E':
164 path_mdconfig = optarg;
165 break;
166 case 'e':
167 argappend(&newfs_arg, "-e %s", optarg);
168 break;
169 case 'F':
170 if (have_mdtype)
171 usage();
172 mdtype = MD_VNODE;
173 have_mdtype = true;
174 argappend(&mdconfig_arg, "-f %s", optarg);
175 break;
176 case 'f':
177 argappend(&newfs_arg, "-f %s", optarg);
178 break;
179 case 'h':
180 usage();
181 break;
182 case 'i':
183 argappend(&newfs_arg, "-i %s", optarg);
184 break;
185 case 'L':
186 loudsubs = true;
187 break;
188 case 'l':
189 mlmac = true;
190 argappend(&newfs_arg, "-l");
191 break;
192 case 'M':
193 if (have_mdtype)
194 usage();
195 mdtype = MD_MALLOC;
196 have_mdtype = true;
197 argappend(&mdconfig_arg, "-o reserve");
198 break;
199 case 'm':
200 argappend(&newfs_arg, "-m %s", optarg);
201 break;
202 case 'N':
203 norun = true;
204 break;
205 case 'n':
206 argappend(&newfs_arg, "-n");
207 break;
208 case 'O':
209 argappend(&newfs_arg, "-o %s", optarg);
210 break;
211 case 'o':
212 argappend(&mount_arg, "-o %s", optarg);
213 break;
214 case 'P':
215 newfs = false;
216 break;
217 case 'p':
218 if ((set = setmode(optarg)) == NULL)
219 usage();
220 mi.mi_mode = getmode(set, S_IRWXU | S_IRWXG | S_IRWXO);
221 mi.mi_have_mode = true;
222 mi.mi_forced_pw = true;
223 free(set);
224 break;
225 case 'S':
226 softdep = false;
227 break;
228 case 's':
229 size_arg = optarg;
230 break;
231 case 't':
232 argappend(&newfs_arg, "-t");
233 break;
234 case 'T':
235 argappend(&mount_arg, "-t %s", optarg);
236 break;
237 case 'U':
238 softdep = true;
239 break;
240 case 'v':
241 argappend(&newfs_arg, "-O %s", optarg);
242 break;
243 case 'w':
244 extract_ugid(optarg, &mi);
245 mi.mi_forced_pw = true;
246 break;
247 case 'X':
248 debug = true;
249 break;
250 default:
251 usage();
252 }
253 argc -= optind;
254 argv += optind;
255 if (argc < 2)
256 usage();
257
258 /*
259 * Historically our size arg was passed directly to mdconfig, which
260 * treats a number without a suffix as a count of 512-byte sectors;
261 * tmpfs would treat it as a count of bytes. To get predictable
262 * behavior for 'auto' we document that the size always uses mdconfig
263 * rules. To make that work, decode the size here so it can be passed
264 * to either tmpfs or mdconfig as a count of bytes.
265 */
266 if (size_arg != NULL) {
267 mdsize = (intmax_t)strtoumax(size_arg, &p, 0);
268 if (p == size_arg || (p[0] != 0 && p[1] != 0) || mdsize < 0)
269 errx(1, "invalid size '%s'", size_arg);
270 switch (*p) {
271 case 'p':
272 case 'P':
273 mdsize *= 1024;
274 case 't':
275 case 'T':
276 mdsize *= 1024;
277 case 'g':
278 case 'G':
279 mdsize *= 1024;
280 case 'm':
281 case 'M':
282 mdsize *= 1024;
283 case 'k':
284 case 'K':
285 mdsize *= 1024;
286 case 'b':
287 case 'B':
288 break;
289 case '\0':
290 mdsize *= 512;
291 break;
292 default:
293 errx(1, "invalid size suffix on '%s'", size_arg);
294 }
295 }
296
297 /*
298 * Based on the command line 'md-device' either mount a tmpfs filesystem
299 * or configure the md device then format and mount a filesystem on it.
300 * If the device is 'auto' use tmpfs if it is available and there is no
301 * request for multilabel MAC (which tmpfs does not support).
302 */
303 unitstr = argv[0];
304 mtpoint = argv[1];
305
306 if (strcmp(unitstr, "auto") == 0) {
307 if (mlmac)
308 idx = -1; /* Must use md for mlmac. */
309 else if ((idx = modfind("tmpfs")) == -1)
310 idx = kldload("tmpfs");
311 if (idx == -1)
312 unitstr = "md";
313 else
314 unitstr = "tmpfs";
315 }
316
317 if (strcmp(unitstr, "tmpfs") == 0) {
318 if (size_arg != NULL && mdsize != 0)
319 argappend(&mount_arg, "-o size=%jd", mdsize);
320 do_mount_tmpfs(mount_arg, mtpoint);
321 } else {
322 if (size_arg != NULL)
323 argappend(&mdconfig_arg, "-s %jdB", mdsize);
324 if (strncmp(unitstr, "/dev/", 5) == 0)
325 unitstr += 5;
326 if (strncmp(unitstr, mdname, mdnamelen) == 0)
327 unitstr += mdnamelen;
328 if (!isdigit(*unitstr)) {
329 autounit = true;
330 unit = -1;
331 mdsuffix = unitstr;
332 } else {
333 ul = strtoul(unitstr, &p, 10);
334 if (ul == ULONG_MAX)
335 errx(1, "bad device unit: %s", unitstr);
336 unit = ul;
337 mdsuffix = p; /* can be empty */
338 }
339
340 if (!have_mdtype)
341 mdtype = MD_SWAP;
342 if (softdep)
343 argappend(&newfs_arg, "-U");
344 if (mdtype != MD_VNODE && !newfs)
345 errx(1, "-P requires a vnode-backed disk");
346
347 /* Do the work. */
348 if (detach && !autounit)
349 do_mdconfig_detach();
350 if (autounit)
351 do_mdconfig_attach_au(mdconfig_arg, mdtype);
352 else
353 do_mdconfig_attach(mdconfig_arg, mdtype);
354 if (newfs)
355 do_newfs(newfs_arg);
356 do_mount_md(mount_arg, mtpoint);
357 }
358
359 do_mtptsetup(mtpoint, &mi);
360
361 return (0);
362 }
363
364 /*
365 * Append the expansion of 'fmt' to the buffer pointed to by '*dstp';
366 * reallocate as required.
367 */
368 static void
argappend(char ** dstp,const char * fmt,...)369 argappend(char **dstp, const char *fmt, ...)
370 {
371 char *old, *new;
372 va_list ap;
373
374 old = *dstp;
375 assert(old != NULL);
376
377 va_start(ap, fmt);
378 if (vasprintf(&new, fmt,ap) == -1)
379 errx(1, "vasprintf");
380 va_end(ap);
381
382 *dstp = new;
383 if (asprintf(&new, "%s %s", old, new) == -1)
384 errx(1, "asprintf");
385 free(*dstp);
386 free(old);
387
388 *dstp = new;
389 }
390
391 /*
392 * If run-time debugging is enabled, print the expansion of 'fmt'.
393 * Otherwise, do nothing.
394 */
395 static void
debugprintf(const char * fmt,...)396 debugprintf(const char *fmt, ...)
397 {
398 va_list ap;
399
400 if (!debug)
401 return;
402 fprintf(stderr, "DEBUG: ");
403 va_start(ap, fmt);
404 vfprintf(stderr, fmt, ap);
405 va_end(ap);
406 fprintf(stderr, "\n");
407 fflush(stderr);
408 }
409
410 /*
411 * Attach a memory disk with a known unit.
412 */
413 static void
do_mdconfig_attach(const char * args,const enum md_types mdtype)414 do_mdconfig_attach(const char *args, const enum md_types mdtype)
415 {
416 int rv;
417 const char *ta; /* Type arg. */
418
419 switch (mdtype) {
420 case MD_SWAP:
421 ta = "-t swap";
422 break;
423 case MD_VNODE:
424 ta = "-t vnode";
425 break;
426 case MD_MALLOC:
427 ta = "-t malloc";
428 break;
429 default:
430 abort();
431 }
432 rv = run(NULL, "%s -a %s%s -u %s%d", path_mdconfig, ta, args,
433 mdname, unit);
434 if (rv)
435 errx(1, "mdconfig (attach) exited with error code %d", rv);
436 }
437
438 /*
439 * Attach a memory disk with an unknown unit; use autounit.
440 */
441 static void
do_mdconfig_attach_au(const char * args,const enum md_types mdtype)442 do_mdconfig_attach_au(const char *args, const enum md_types mdtype)
443 {
444 const char *ta; /* Type arg. */
445 char *linep;
446 char linebuf[12]; /* 32-bit unit (10) + '\n' (1) + '\0' (1) */
447 int fd; /* Standard output of mdconfig invocation. */
448 FILE *sfd;
449 int rv;
450 char *p;
451 size_t linelen;
452 unsigned long ul;
453
454 switch (mdtype) {
455 case MD_SWAP:
456 ta = "-t swap";
457 break;
458 case MD_VNODE:
459 ta = "-t vnode";
460 break;
461 case MD_MALLOC:
462 ta = "-t malloc";
463 break;
464 default:
465 abort();
466 }
467 rv = run(&fd, "%s -a %s%s", path_mdconfig, ta, args);
468 if (rv)
469 errx(1, "mdconfig (attach) exited with error code %d", rv);
470
471 /* Receive the unit number. */
472 if (norun) { /* Since we didn't run, we can't read. Fake it. */
473 unit = 0;
474 return;
475 }
476 sfd = fdopen(fd, "r");
477 if (sfd == NULL)
478 err(1, "fdopen");
479 linep = fgetln(sfd, &linelen);
480 /* If the output format changes, we want to know about it. */
481 if (linep == NULL || linelen <= mdnamelen + 1 ||
482 linelen - mdnamelen >= sizeof(linebuf) ||
483 strncmp(linep, mdname, mdnamelen) != 0)
484 errx(1, "unexpected output from mdconfig (attach)");
485 linep += mdnamelen;
486 linelen -= mdnamelen;
487 /* Can't use strlcpy because linep is not NULL-terminated. */
488 strncpy(linebuf, linep, linelen);
489 linebuf[linelen] = '\0';
490 ul = strtoul(linebuf, &p, 10);
491 if (ul == ULONG_MAX || *p != '\n')
492 errx(1, "unexpected output from mdconfig (attach)");
493 unit = ul;
494
495 fclose(sfd);
496 }
497
498 /*
499 * Detach a memory disk.
500 */
501 static void
do_mdconfig_detach(void)502 do_mdconfig_detach(void)
503 {
504 int rv;
505
506 rv = run(NULL, "%s -d -u %s%d", path_mdconfig, mdname, unit);
507 if (rv && debug) /* This is allowed to fail. */
508 warnx("mdconfig (detach) exited with error code %d (ignored)",
509 rv);
510 }
511
512 /*
513 * Mount the configured memory disk.
514 */
515 static void
do_mount_md(const char * args,const char * mtpoint)516 do_mount_md(const char *args, const char *mtpoint)
517 {
518 int rv;
519
520 rv = run(NULL, "%s%s /dev/%s%d%s %s", _PATH_MOUNT, args,
521 mdname, unit, mdsuffix, mtpoint);
522 if (rv)
523 errx(1, "mount exited with error code %d", rv);
524 }
525
526 /*
527 * Mount the configured tmpfs.
528 */
529 static void
do_mount_tmpfs(const char * args,const char * mtpoint)530 do_mount_tmpfs(const char *args, const char *mtpoint)
531 {
532 int rv;
533
534 rv = run(NULL, "%s -t tmpfs %s tmp %s", _PATH_MOUNT, args, mtpoint);
535 if (rv)
536 errx(1, "tmpfs mount exited with error code %d", rv);
537 }
538
539 /*
540 * Various configuration of the mountpoint. Mostly, enact 'mip'.
541 */
542 static void
do_mtptsetup(const char * mtpoint,struct mtpt_info * mip)543 do_mtptsetup(const char *mtpoint, struct mtpt_info *mip)
544 {
545 struct statfs sfs;
546
547 if (!mip->mi_have_mode && !mip->mi_have_uid && !mip->mi_have_gid)
548 return;
549
550 if (!norun) {
551 if (statfs(mtpoint, &sfs) == -1) {
552 warn("statfs: %s", mtpoint);
553 return;
554 }
555 if ((sfs.f_flags & MNT_RDONLY) != 0) {
556 if (mip->mi_forced_pw) {
557 warnx(
558 "Not changing mode/owner of %s since it is read-only",
559 mtpoint);
560 } else {
561 debugprintf(
562 "Not changing mode/owner of %s since it is read-only",
563 mtpoint);
564 }
565 return;
566 }
567 }
568
569 if (mip->mi_have_mode) {
570 debugprintf("changing mode of %s to %o.", mtpoint,
571 mip->mi_mode);
572 if (!norun)
573 if (chmod(mtpoint, mip->mi_mode) == -1)
574 err(1, "chmod: %s", mtpoint);
575 }
576 /*
577 * We have to do these separately because the user may have
578 * only specified one of them.
579 */
580 if (mip->mi_have_uid) {
581 debugprintf("changing owner (user) or %s to %u.", mtpoint,
582 mip->mi_uid);
583 if (!norun)
584 if (chown(mtpoint, mip->mi_uid, -1) == -1)
585 err(1, "chown %s to %u (user)", mtpoint,
586 mip->mi_uid);
587 }
588 if (mip->mi_have_gid) {
589 debugprintf("changing owner (group) or %s to %u.", mtpoint,
590 mip->mi_gid);
591 if (!norun)
592 if (chown(mtpoint, -1, mip->mi_gid) == -1)
593 err(1, "chown %s to %u (group)", mtpoint,
594 mip->mi_gid);
595 }
596 }
597
598 /*
599 * Put a file system on the memory disk.
600 */
601 static void
do_newfs(const char * args)602 do_newfs(const char *args)
603 {
604 int rv;
605
606 rv = run(NULL, "%s%s /dev/%s%d", _PATH_NEWFS, args, mdname, unit);
607 if (rv)
608 errx(1, "newfs exited with error code %d", rv);
609 }
610
611 /*
612 * 'str' should be a user and group name similar to the last argument
613 * to chown(1); i.e., a user, followed by a colon, followed by a
614 * group. The user and group in 'str' may be either a [ug]id or a
615 * name. Upon return, the uid and gid fields in 'mip' will contain
616 * the uid and gid of the user and group name in 'str', respectively.
617 *
618 * In other words, this derives a user and group id from a string
619 * formatted like the last argument to chown(1).
620 *
621 * Notice: At this point we don't support only a username or only a
622 * group name. do_mtptsetup already does, so when this feature is
623 * desired, this is the only routine that needs to be changed.
624 */
625 static void
extract_ugid(const char * str,struct mtpt_info * mip)626 extract_ugid(const char *str, struct mtpt_info *mip)
627 {
628 char *ug; /* Writable 'str'. */
629 char *user, *group; /* Result of extracton. */
630 struct passwd *pw;
631 struct group *gr;
632 char *p;
633 uid_t *uid;
634 gid_t *gid;
635
636 uid = &mip->mi_uid;
637 gid = &mip->mi_gid;
638 mip->mi_have_uid = mip->mi_have_gid = false;
639
640 /* Extract the user and group from 'str'. Format above. */
641 ug = strdup(str);
642 assert(ug != NULL);
643 group = ug;
644 user = strsep(&group, ":");
645 if (user == NULL || group == NULL || *user == '\0' || *group == '\0')
646 usage();
647
648 /* Derive uid. */
649 *uid = strtoul(user, &p, 10);
650 if (*uid == (uid_t)ULONG_MAX)
651 usage();
652 if (*p != '\0') {
653 pw = getpwnam(user);
654 if (pw == NULL)
655 errx(1, "invalid user: %s", user);
656 *uid = pw->pw_uid;
657 }
658 mip->mi_have_uid = true;
659
660 /* Derive gid. */
661 *gid = strtoul(group, &p, 10);
662 if (*gid == (gid_t)ULONG_MAX)
663 usage();
664 if (*p != '\0') {
665 gr = getgrnam(group);
666 if (gr == NULL)
667 errx(1, "invalid group: %s", group);
668 *gid = gr->gr_gid;
669 }
670 mip->mi_have_gid = true;
671
672 free(ug);
673 }
674
675 /*
676 * Run a process with command name and arguments pointed to by the
677 * formatted string 'cmdline'. Since system(3) is not used, the first
678 * space-delimited token of 'cmdline' must be the full pathname of the
679 * program to run. The return value is the return code of the process
680 * spawned. If 'ofd' is non-NULL, it is set to the standard output of
681 * the program spawned (i.e., you can read from ofd and get the output
682 * of the program).
683 */
684 static int
run(int * ofd,const char * cmdline,...)685 run(int *ofd, const char *cmdline, ...)
686 {
687 char **argv, **argvp; /* Result of splitting 'cmd'. */
688 int argc;
689 char *cmd; /* Expansion of 'cmdline'. */
690 int pid, status; /* Child info. */
691 int pfd[2]; /* Pipe to the child. */
692 int nfd; /* Null (/dev/null) file descriptor. */
693 bool dup2dn; /* Dup /dev/null to stdout? */
694 va_list ap;
695 char *p;
696 int rv, i;
697
698 dup2dn = true;
699 va_start(ap, cmdline);
700 rv = vasprintf(&cmd, cmdline, ap);
701 if (rv == -1)
702 err(1, "vasprintf");
703 va_end(ap);
704
705 /* Split up 'cmd' into 'argv' for use with execve. */
706 for (argc = 1, p = cmd; (p = strchr(p, ' ')) != NULL; p++)
707 argc++; /* 'argc' generation loop. */
708 argv = (char **)malloc(sizeof(*argv) * (argc + 1));
709 assert(argv != NULL);
710 for (p = cmd, argvp = argv; (*argvp = strsep(&p, " ")) != NULL;)
711 if (**argvp != '\0')
712 if (++argvp >= &argv[argc]) {
713 *argvp = NULL;
714 break;
715 }
716 assert(*argv);
717 /* The argv array ends up NULL-terminated here. */
718
719 /* Make sure the above loop works as expected. */
720 if (debug) {
721 /*
722 * We can't, but should, use debugprintf here. First,
723 * it appends a trailing newline to the output, and
724 * second it prepends "DEBUG: " to the output. The
725 * former is a problem for this would-be first call,
726 * and the latter for the would-be call inside the
727 * loop.
728 */
729 (void)fprintf(stderr, "DEBUG: running:");
730 /* Should be equivalent to 'cmd' (before strsep, of course). */
731 for (i = 0; argv[i] != NULL; i++)
732 (void)fprintf(stderr, " %s", argv[i]);
733 (void)fprintf(stderr, "\n");
734 }
735
736 /* Create a pipe if necessary and fork the helper program. */
737 if (ofd != NULL) {
738 if (pipe(&pfd[0]) == -1)
739 err(1, "pipe");
740 *ofd = pfd[0];
741 dup2dn = false;
742 }
743 pid = fork();
744 switch (pid) {
745 case 0:
746 /* XXX can we call err() in here? */
747 if (norun)
748 _exit(0);
749 if (ofd != NULL)
750 if (dup2(pfd[1], STDOUT_FILENO) < 0)
751 err(1, "dup2");
752 if (!loudsubs) {
753 nfd = open(_PATH_DEVNULL, O_RDWR);
754 if (nfd == -1)
755 err(1, "open: %s", _PATH_DEVNULL);
756 if (dup2(nfd, STDIN_FILENO) < 0)
757 err(1, "dup2");
758 if (dup2dn)
759 if (dup2(nfd, STDOUT_FILENO) < 0)
760 err(1, "dup2");
761 if (dup2(nfd, STDERR_FILENO) < 0)
762 err(1, "dup2");
763 }
764
765 (void)execv(argv[0], argv);
766 warn("exec: %s", argv[0]);
767 _exit(-1);
768 case -1:
769 err(1, "fork");
770 }
771
772 free(cmd);
773 free(argv);
774 while (waitpid(pid, &status, 0) != pid)
775 ;
776 return (WEXITSTATUS(status));
777 }
778
779 static void
usage(void)780 usage(void)
781 {
782
783 fprintf(stderr,
784 "usage: %s [-DLlMNnPStUX] [-a maxcontig] [-b block-size]\n"
785 "\t[-c blocks-per-cylinder-group][-d max-extent-size] [-E path-mdconfig]\n"
786 "\t[-e maxbpg] [-F file] [-f frag-size] [-i bytes] [-m percent-free]\n"
787 "\t[-O optimization] [-o mount-options]\n"
788 "\t[-p permissions] [-s size] [-v version] [-w user:group]\n"
789 "\tmd-device mount-point\n", getprogname());
790 exit(1);
791 }
792