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/bin/mv/mv.c

https://bitbucket.org/freebsd/freebsd-head/
C | 503 lines | 386 code | 36 blank | 81 comment | 128 complexity | eb2b846d3d755428e6030fefecc9dc53 MD5 | raw file
  1/*-
  2 * Copyright (c) 1989, 1993, 1994
  3 *	The Regents of the University of California.  All rights reserved.
  4 *
  5 * This code is derived from software contributed to Berkeley by
  6 * Ken Smith of The State University of New York at Buffalo.
  7 *
  8 * Redistribution and use in source and binary forms, with or without
  9 * modification, are permitted provided that the following conditions
 10 * are met:
 11 * 1. Redistributions of source code must retain the above copyright
 12 *    notice, this list of conditions and the following disclaimer.
 13 * 2. Redistributions in binary form must reproduce the above copyright
 14 *    notice, this list of conditions and the following disclaimer in the
 15 *    documentation and/or other materials provided with the distribution.
 16 * 4. Neither the name of the University nor the names of its contributors
 17 *    may be used to endorse or promote products derived from this software
 18 *    without specific prior written permission.
 19 *
 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 30 * SUCH DAMAGE.
 31 */
 32
 33#if 0
 34#ifndef lint
 35static char const copyright[] =
 36"@(#) Copyright (c) 1989, 1993, 1994\n\
 37	The Regents of the University of California.  All rights reserved.\n";
 38#endif /* not lint */
 39
 40#ifndef lint
 41static char sccsid[] = "@(#)mv.c	8.2 (Berkeley) 4/2/94";
 42#endif /* not lint */
 43#endif
 44#include <sys/cdefs.h>
 45__FBSDID("$FreeBSD$");
 46
 47#include <sys/types.h>
 48#include <sys/acl.h>
 49#include <sys/param.h>
 50#include <sys/time.h>
 51#include <sys/wait.h>
 52#include <sys/stat.h>
 53#include <sys/mount.h>
 54
 55#include <err.h>
 56#include <errno.h>
 57#include <fcntl.h>
 58#include <grp.h>
 59#include <limits.h>
 60#include <paths.h>
 61#include <pwd.h>
 62#include <stdio.h>
 63#include <stdlib.h>
 64#include <string.h>
 65#include <sysexits.h>
 66#include <unistd.h>
 67
 68/* Exit code for a failed exec. */
 69#define EXEC_FAILED 127
 70
 71static int	fflg, hflg, iflg, nflg, vflg;
 72
 73static int	copy(const char *, const char *);
 74static int	do_move(const char *, const char *);
 75static int	fastcopy(const char *, const char *, struct stat *);
 76static void	usage(void);
 77static void	preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
 78		    const char *dest_path);
 79
 80int
 81main(int argc, char *argv[])
 82{
 83	size_t baselen, len;
 84	int rval;
 85	char *p, *endp;
 86	struct stat sb;
 87	int ch;
 88	char path[PATH_MAX];
 89
 90	while ((ch = getopt(argc, argv, "fhinv")) != -1)
 91		switch (ch) {
 92		case 'h':
 93			hflg = 1;
 94			break;
 95		case 'i':
 96			iflg = 1;
 97			fflg = nflg = 0;
 98			break;
 99		case 'f':
100			fflg = 1;
101			iflg = nflg = 0;
102			break;
103		case 'n':
104			nflg = 1;
105			fflg = iflg = 0;
106			break;
107		case 'v':
108			vflg = 1;
109			break;
110		default:
111			usage();
112		}
113	argc -= optind;
114	argv += optind;
115
116	if (argc < 2)
117		usage();
118
119	/*
120	 * If the stat on the target fails or the target isn't a directory,
121	 * try the move.  More than 2 arguments is an error in this case.
122	 */
123	if (stat(argv[argc - 1], &sb) || !S_ISDIR(sb.st_mode)) {
124		if (argc > 2)
125			usage();
126		exit(do_move(argv[0], argv[1]));
127	}
128
129	/*
130	 * If -h was specified, treat the target as a symlink instead of
131	 * directory.
132	 */
133	if (hflg) {
134		if (argc > 2)
135			usage();
136		if (lstat(argv[1], &sb) == 0 && S_ISLNK(sb.st_mode))
137			exit(do_move(argv[0], argv[1]));
138	}
139
140	/* It's a directory, move each file into it. */
141	if (strlen(argv[argc - 1]) > sizeof(path) - 1)
142		errx(1, "%s: destination pathname too long", *argv);
143	(void)strcpy(path, argv[argc - 1]);
144	baselen = strlen(path);
145	endp = &path[baselen];
146	if (!baselen || *(endp - 1) != '/') {
147		*endp++ = '/';
148		++baselen;
149	}
150	for (rval = 0; --argc; ++argv) {
151		/*
152		 * Find the last component of the source pathname.  It
153		 * may have trailing slashes.
154		 */
155		p = *argv + strlen(*argv);
156		while (p != *argv && p[-1] == '/')
157			--p;
158		while (p != *argv && p[-1] != '/')
159			--p;
160
161		if ((baselen + (len = strlen(p))) >= PATH_MAX) {
162			warnx("%s: destination pathname too long", *argv);
163			rval = 1;
164		} else {
165			memmove(endp, p, (size_t)len + 1);
166			if (do_move(*argv, path))
167				rval = 1;
168		}
169	}
170	exit(rval);
171}
172
173static int
174do_move(const char *from, const char *to)
175{
176	struct stat sb;
177	int ask, ch, first;
178	char modep[15];
179
180	/*
181	 * Check access.  If interactive and file exists, ask user if it
182	 * should be replaced.  Otherwise if file exists but isn't writable
183	 * make sure the user wants to clobber it.
184	 */
185	if (!fflg && !access(to, F_OK)) {
186
187		/* prompt only if source exist */
188	        if (lstat(from, &sb) == -1) {
189			warn("%s", from);
190			return (1);
191		}
192
193#define YESNO "(y/n [n]) "
194		ask = 0;
195		if (nflg) {
196			if (vflg)
197				printf("%s not overwritten\n", to);
198			return (0);
199		} else if (iflg) {
200			(void)fprintf(stderr, "overwrite %s? %s", to, YESNO);
201			ask = 1;
202		} else if (access(to, W_OK) && !stat(to, &sb)) {
203			strmode(sb.st_mode, modep);
204			(void)fprintf(stderr, "override %s%s%s/%s for %s? %s",
205			    modep + 1, modep[9] == ' ' ? "" : " ",
206			    user_from_uid((unsigned long)sb.st_uid, 0),
207			    group_from_gid((unsigned long)sb.st_gid, 0), to, YESNO);
208			ask = 1;
209		}
210		if (ask) {
211			first = ch = getchar();
212			while (ch != '\n' && ch != EOF)
213				ch = getchar();
214			if (first != 'y' && first != 'Y') {
215				(void)fprintf(stderr, "not overwritten\n");
216				return (0);
217			}
218		}
219	}
220	/*
221	 * Rename on FreeBSD will fail with EISDIR and ENOTDIR, before failing
222	 * with EXDEV.  Therefore, copy() doesn't have to perform the checks
223	 * specified in the Step 3 of the POSIX mv specification.
224	 */
225	if (!rename(from, to)) {
226		if (vflg)
227			printf("%s -> %s\n", from, to);
228		return (0);
229	}
230
231	if (errno == EXDEV) {
232		struct statfs sfs;
233		char path[PATH_MAX];
234
235		/*
236		 * If the source is a symbolic link and is on another
237		 * filesystem, it can be recreated at the destination.
238		 */
239		if (lstat(from, &sb) == -1) {
240			warn("%s", from);
241			return (1);
242		}
243		if (!S_ISLNK(sb.st_mode)) {
244			/* Can't mv(1) a mount point. */
245			if (realpath(from, path) == NULL) {
246				warn("cannot resolve %s: %s", from, path);
247				return (1);
248			}
249			if (!statfs(path, &sfs) &&
250			    !strcmp(path, sfs.f_mntonname)) {
251				warnx("cannot rename a mount point");
252				return (1);
253			}
254		}
255	} else {
256		warn("rename %s to %s", from, to);
257		return (1);
258	}
259
260	/*
261	 * If rename fails because we're trying to cross devices, and
262	 * it's a regular file, do the copy internally; otherwise, use
263	 * cp and rm.
264	 */
265	if (lstat(from, &sb)) {
266		warn("%s", from);
267		return (1);
268	}
269	return (S_ISREG(sb.st_mode) ?
270	    fastcopy(from, to, &sb) : copy(from, to));
271}
272
273static int
274fastcopy(const char *from, const char *to, struct stat *sbp)
275{
276	struct timeval tval[2];
277	static u_int blen = MAXPHYS;
278	static char *bp = NULL;
279	mode_t oldmode;
280	int nread, from_fd, to_fd;
281
282	if ((from_fd = open(from, O_RDONLY, 0)) < 0) {
283		warn("fastcopy: open() failed (from): %s", from);
284		return (1);
285	}
286	if (bp == NULL && (bp = malloc((size_t)blen)) == NULL) {
287		warnx("malloc(%u) failed", blen);
288		return (1);
289	}
290	while ((to_fd =
291	    open(to, O_CREAT | O_EXCL | O_TRUNC | O_WRONLY, 0)) < 0) {
292		if (errno == EEXIST && unlink(to) == 0)
293			continue;
294		warn("fastcopy: open() failed (to): %s", to);
295		(void)close(from_fd);
296		return (1);
297	}
298	while ((nread = read(from_fd, bp, (size_t)blen)) > 0)
299		if (write(to_fd, bp, (size_t)nread) != nread) {
300			warn("fastcopy: write() failed: %s", to);
301			goto err;
302		}
303	if (nread < 0) {
304		warn("fastcopy: read() failed: %s", from);
305err:		if (unlink(to))
306			warn("%s: remove", to);
307		(void)close(from_fd);
308		(void)close(to_fd);
309		return (1);
310	}
311
312	oldmode = sbp->st_mode & ALLPERMS;
313	if (fchown(to_fd, sbp->st_uid, sbp->st_gid)) {
314		warn("%s: set owner/group (was: %lu/%lu)", to,
315		    (u_long)sbp->st_uid, (u_long)sbp->st_gid);
316		if (oldmode & (S_ISUID | S_ISGID)) {
317			warnx(
318"%s: owner/group changed; clearing suid/sgid (mode was 0%03o)",
319			    to, oldmode);
320			sbp->st_mode &= ~(S_ISUID | S_ISGID);
321		}
322	}
323	if (fchmod(to_fd, sbp->st_mode))
324		warn("%s: set mode (was: 0%03o)", to, oldmode);
325	/*
326	 * POSIX 1003.2c states that if _POSIX_ACL_EXTENDED is in effect
327	 * for dest_file, then its ACLs shall reflect the ACLs of the
328	 * source_file.
329	 */
330	preserve_fd_acls(from_fd, to_fd, from, to);
331	(void)close(from_fd);
332	/*
333	 * XXX
334	 * NFS doesn't support chflags; ignore errors unless there's reason
335	 * to believe we're losing bits.  (Note, this still won't be right
336	 * if the server supports flags and we were trying to *remove* flags
337	 * on a file that we copied, i.e., that we didn't create.)
338	 */
339	errno = 0;
340	if (fchflags(to_fd, (u_long)sbp->st_flags))
341		if (errno != EOPNOTSUPP || sbp->st_flags != 0)
342			warn("%s: set flags (was: 0%07o)", to, sbp->st_flags);
343
344	tval[0].tv_sec = sbp->st_atime;
345	tval[1].tv_sec = sbp->st_mtime;
346	tval[0].tv_usec = tval[1].tv_usec = 0;
347	if (utimes(to, tval))
348		warn("%s: set times", to);
349
350	if (close(to_fd)) {
351		warn("%s", to);
352		return (1);
353	}
354
355	if (unlink(from)) {
356		warn("%s: remove", from);
357		return (1);
358	}
359	if (vflg)
360		printf("%s -> %s\n", from, to);
361	return (0);
362}
363
364static int
365copy(const char *from, const char *to)
366{
367	struct stat sb;
368	int pid, status;
369
370	if (lstat(to, &sb) == 0) {
371		/* Destination path exists. */
372		if (S_ISDIR(sb.st_mode)) {
373			if (rmdir(to) != 0) {
374				warn("rmdir %s", to);
375				return (1);
376			}
377		} else {
378			if (unlink(to) != 0) {
379				warn("unlink %s", to);
380				return (1);
381			}
382		}
383	} else if (errno != ENOENT) {
384		warn("%s", to);
385		return (1);
386	}
387
388	/* Copy source to destination. */
389	if (!(pid = vfork())) {
390		execl(_PATH_CP, "mv", vflg ? "-PRpv" : "-PRp", "--", from, to,
391		    (char *)NULL);
392		_exit(EXEC_FAILED);
393	}
394	if (waitpid(pid, &status, 0) == -1) {
395		warn("%s %s %s: waitpid", _PATH_CP, from, to);
396		return (1);
397	}
398	if (!WIFEXITED(status)) {
399		warnx("%s %s %s: did not terminate normally",
400		    _PATH_CP, from, to);
401		return (1);
402	}
403	switch (WEXITSTATUS(status)) {
404	case 0:
405		break;
406	case EXEC_FAILED:
407		warnx("%s %s %s: exec failed", _PATH_CP, from, to);
408		return (1);
409	default:
410		warnx("%s %s %s: terminated with %d (non-zero) status",
411		    _PATH_CP, from, to, WEXITSTATUS(status));
412		return (1);
413	}
414
415	/* Delete the source. */
416	if (!(pid = vfork())) {
417		execl(_PATH_RM, "mv", "-rf", "--", from, (char *)NULL);
418		_exit(EXEC_FAILED);
419	}
420	if (waitpid(pid, &status, 0) == -1) {
421		warn("%s %s: waitpid", _PATH_RM, from);
422		return (1);
423	}
424	if (!WIFEXITED(status)) {
425		warnx("%s %s: did not terminate normally", _PATH_RM, from);
426		return (1);
427	}
428	switch (WEXITSTATUS(status)) {
429	case 0:
430		break;
431	case EXEC_FAILED:
432		warnx("%s %s: exec failed", _PATH_RM, from);
433		return (1);
434	default:
435		warnx("%s %s: terminated with %d (non-zero) status",
436		    _PATH_RM, from, WEXITSTATUS(status));
437		return (1);
438	}
439	return (0);
440}
441
442static void
443preserve_fd_acls(int source_fd, int dest_fd, const char *source_path,
444    const char *dest_path)
445{
446	acl_t acl;
447	acl_type_t acl_type;
448	int acl_supported = 0, ret, trivial;
449
450	ret = fpathconf(source_fd, _PC_ACL_NFS4);
451	if (ret > 0 ) {
452		acl_supported = 1;
453		acl_type = ACL_TYPE_NFS4;
454	} else if (ret < 0 && errno != EINVAL) {
455		warn("fpathconf(..., _PC_ACL_NFS4) failed for %s",
456		    source_path);
457		return;
458	}
459	if (acl_supported == 0) {
460		ret = fpathconf(source_fd, _PC_ACL_EXTENDED);
461		if (ret > 0 ) {
462			acl_supported = 1;
463			acl_type = ACL_TYPE_ACCESS;
464		} else if (ret < 0 && errno != EINVAL) {
465			warn("fpathconf(..., _PC_ACL_EXTENDED) failed for %s",
466			    source_path);
467			return;
468		}
469	}
470	if (acl_supported == 0)
471		return;
472
473	acl = acl_get_fd_np(source_fd, acl_type);
474	if (acl == NULL) {
475		warn("failed to get acl entries for %s", source_path);
476		return;
477	}
478	if (acl_is_trivial_np(acl, &trivial)) {
479		warn("acl_is_trivial() failed for %s", source_path);
480		acl_free(acl);
481		return;
482	}
483	if (trivial) {
484		acl_free(acl);
485		return;
486	}
487	if (acl_set_fd_np(dest_fd, acl, acl_type) < 0) {
488		warn("failed to set acl entries for %s", dest_path);
489		acl_free(acl);
490		return;
491	}
492	acl_free(acl);
493}
494
495static void
496usage(void)
497{
498
499	(void)fprintf(stderr, "%s\n%s\n",
500		      "usage: mv [-f | -i | -n] [-hv] source target",
501		      "       mv [-f | -i | -n] [-v] source ... directory");
502	exit(EX_USAGE);
503}