bug 2443: bin/cp: sync with FreeBSD (bug fixes + new options)
[dragonfly.git] / bin / cp / cp.c
CommitLineData
7cfd531a 1/*-
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2 * Copyright (c) 1988, 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 * David Hitz of Auspex Systems Inc.
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.
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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
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33/*
34 * Cp copies source files to target files.
35 *
36 * The global PATH_T structure "to" always contains the path to the
37 * current target file. Since fts(3) does not change directories,
38 * this path can be either absolute or dot-relative.
39 *
40 * The basic algorithm is to initialize "to" and use fts(3) to traverse
41 * the file hierarchy rooted in the argument list. A trivial case is the
42 * case of 'cp file1 file2'. The more interesting case is the case of
43 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
44 * path (relative to the root of the traversal) is appended to dir (stored
45 * in "to") to form the final target path.
46 */
47
779388d9 48#include <sys/types.h>
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49#include <sys/stat.h>
50
51#include <err.h>
52#include <errno.h>
53#include <fts.h>
54#include <limits.h>
779388d9 55#include <signal.h>
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56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60
61#include "extern.h"
62
63#define STRIP_TRAILING_SLASH(p) { \
64 while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/') \
65 *--(p).p_end = 0; \
66}
67
7cfd531a
JM
68static char emptystring[] = "";
69
70PATH_T to = { to.p_path, emptystring, "" };
984263bc 71
7cfd531a 72int fflag, iflag, lflag, nflag, pflag, vflag;
08ffd647 73static int Rflag, rflag;
779388d9 74volatile sig_atomic_t info;
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75
76enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
77
7cfd531a 78static int copy(char *[], enum op, int);
59b616d3 79static int mastercmp (const FTSENT * const *, const FTSENT * const *);
779388d9 80static void siginfo (int);
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81
82int
7cfd531a 83main(int argc, char *argv[])
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84{
85 struct stat to_stat, tmp_stat;
86 enum op type;
7cfd531a 87 int Hflag, Lflag, Pflag, ch, fts_options, r, have_trailing_slash;
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88 char *target;
89
7cfd531a 90 fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
984263bc 91 Hflag = Lflag = Pflag = 0;
7cfd531a 92 while ((ch = getopt(argc, argv, "HLPRafilnprvx")) != -1)
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93 switch (ch) {
94 case 'H':
95 Hflag = 1;
96 Lflag = Pflag = 0;
97 break;
98 case 'L':
99 Lflag = 1;
100 Hflag = Pflag = 0;
101 break;
102 case 'P':
103 Pflag = 1;
104 Hflag = Lflag = 0;
105 break;
106 case 'R':
107 Rflag = 1;
108 break;
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JM
109 case 'a':
110 Pflag = 1;
111 pflag = 1;
112 Rflag = 1;
113 Hflag = Lflag = 0;
114 break;
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115 case 'f':
116 fflag = 1;
117 iflag = nflag = 0;
118 break;
119 case 'i':
120 iflag = 1;
121 fflag = nflag = 0;
122 break;
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123 case 'l':
124 lflag = 1;
125 break;
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126 case 'n':
127 nflag = 1;
128 fflag = iflag = 0;
129 break;
130 case 'p':
131 pflag = 1;
132 break;
133 case 'r':
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134 rflag = Lflag = 1;
135 Hflag = Pflag = 0;
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136 break;
137 case 'v':
138 vflag = 1;
139 break;
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140 case 'x':
141 fts_options |= FTS_XDEV;
142 break;
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143 default:
144 usage();
145 break;
146 }
147 argc -= optind;
148 argv += optind;
149
150 if (argc < 2)
151 usage();
152
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JM
153 if (Rflag && rflag)
154 errx(1, "the -R and -r options may not be specified together");
155 if (rflag)
156 Rflag = 1;
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157 if (Rflag) {
158 if (Hflag)
159 fts_options |= FTS_COMFOLLOW;
160 if (Lflag) {
161 fts_options &= ~FTS_PHYSICAL;
162 fts_options |= FTS_LOGICAL;
163 }
164 } else {
165 fts_options &= ~FTS_PHYSICAL;
3abc2185 166 fts_options |= FTS_LOGICAL | FTS_COMFOLLOW;
984263bc 167 }
7cfd531a 168 (void)signal(SIGINFO, siginfo);
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169
170 /* Save the target base in "to". */
171 target = argv[--argc];
172 if (strlcpy(to.p_path, target, sizeof(to.p_path)) >= sizeof(to.p_path))
173 errx(1, "%s: name too long", target);
174 to.p_end = to.p_path + strlen(to.p_path);
7cfd531a 175 if (to.p_path == to.p_end) {
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176 *to.p_end++ = '.';
177 *to.p_end = 0;
178 }
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179 have_trailing_slash = (to.p_end[-1] == '/');
180 if (have_trailing_slash)
3abc2185 181 STRIP_TRAILING_SLASH(to);
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182 to.target_end = to.p_end;
183
184 /* Set end of argument list for fts(3). */
185 argv[argc] = NULL;
186
187 /*
188 * Cp has two distinct cases:
189 *
190 * cp [-R] source target
191 * cp [-R] source1 ... sourceN directory
192 *
193 * In both cases, source can be either a file or a directory.
194 *
195 * In (1), the target becomes a copy of the source. That is, if the
196 * source is a file, the target will be a file, and likewise for
197 * directories.
198 *
199 * In (2), the real target is not directory, but "directory/source".
200 */
201 r = stat(to.p_path, &to_stat);
202 if (r == -1 && errno != ENOENT)
203 err(1, "%s", to.p_path);
204 if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
205 /*
206 * Case (1). Target is not a directory.
207 */
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208 if (argc > 1)
209 errx(1, "%s is not a directory", to.p_path);
210
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211 /*
212 * Need to detect the case:
213 * cp -R dir foo
214 * Where dir is a directory and foo does not exist, where
215 * we want pathname concatenations turned on but not for
216 * the initial mkdir().
217 */
218 if (r == -1) {
7cfd531a 219 if (Rflag && (Lflag || Hflag))
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220 stat(*argv, &tmp_stat);
221 else
222 lstat(*argv, &tmp_stat);
223
7cfd531a 224 if (S_ISDIR(tmp_stat.st_mode) && Rflag)
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225 type = DIR_TO_DNE;
226 else
227 type = FILE_TO_FILE;
228 } else
229 type = FILE_TO_FILE;
3abc2185 230
7cfd531a 231 if (have_trailing_slash && type == FILE_TO_FILE) {
3abc2185 232 if (r == -1)
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233 errx(1, "directory %s does not exist",
234 to.p_path);
3abc2185
CP
235 else
236 errx(1, "%s is not a directory", to.p_path);
237 }
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238 } else
239 /*
240 * Case (2). Target is a directory.
241 */
242 type = FILE_TO_DIR;
243
244 exit (copy(argv, type, fts_options));
245}
246
2a47c630 247static int
7cfd531a 248copy(char *argv[], enum op type, int fts_options)
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249{
250 struct stat to_stat;
251 FTS *ftsp;
252 FTSENT *curr;
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253 int base = 0, dne, badcp, rval;
254 size_t nlen;
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255 char *p, *target_mid;
256 mode_t mask, mode;
257
258 /*
259 * Keep an inverted copy of the umask, for use in correcting
260 * permissions on created directories when not using -p.
261 */
262 mask = ~umask(0777);
263 umask(~mask);
264
265 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
7cfd531a 266 err(1, "fts_open");
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267 for (badcp = rval = 0; (curr = fts_read(ftsp)) != NULL; badcp = 0) {
268 switch (curr->fts_info) {
269 case FTS_NS:
270 case FTS_DNR:
271 case FTS_ERR:
272 warnx("%s: %s",
273 curr->fts_path, strerror(curr->fts_errno));
e10e866a 274 rval = 1;
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275 continue;
276 case FTS_DC: /* Warn, continue. */
277 warnx("%s: directory causes a cycle", curr->fts_path);
e10e866a 278 rval = 1;
984263bc 279 continue;
7cfd531a
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280 default:
281 ;
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282 }
283
284 /*
285 * If we are in case (2) or (3) above, we need to append the
7cfd531a
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286 * source name to the target name.
287 */
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288 if (type != FILE_TO_FILE) {
289 /*
290 * Need to remember the roots of traversals to create
291 * correct pathnames. If there's a directory being
292 * copied to a non-existent directory, e.g.
293 * cp -R a/dir noexist
294 * the resulting path name should be noexist/foo, not
295 * noexist/dir/foo (where foo is a file in dir), which
296 * is the case where the target exists.
297 *
298 * Also, check for "..". This is for correct path
299 * concatenation for paths ending in "..", e.g.
300 * cp -R .. /tmp
301 * Paths ending in ".." are changed to ".". This is
302 * tricky, but seems the easiest way to fix the problem.
303 *
304 * XXX
305 * Since the first level MUST be FTS_ROOTLEVEL, base
306 * is always initialized.
307 */
308 if (curr->fts_level == FTS_ROOTLEVEL) {
309 if (type != DIR_TO_DNE) {
310 p = strrchr(curr->fts_path, '/');
311 base = (p == NULL) ? 0 :
312 (int)(p - curr->fts_path + 1);
313
314 if (!strcmp(&curr->fts_path[base],
315 ".."))
316 base += 1;
317 } else
318 base = curr->fts_pathlen;
319 }
320
321 p = &curr->fts_path[base];
322 nlen = curr->fts_pathlen - base;
323 target_mid = to.target_end;
324 if (*p != '/' && target_mid[-1] != '/')
325 *target_mid++ = '/';
326 *target_mid = 0;
327 if (target_mid - to.p_path + nlen >= PATH_MAX) {
328 warnx("%s%s: name too long (not copied)",
329 to.p_path, p);
e10e866a 330 rval = 1;
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331 continue;
332 }
7cfd531a 333 (void)strncat(target_mid, p, nlen);
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334 to.p_end = target_mid + nlen;
335 *to.p_end = 0;
336 STRIP_TRAILING_SLASH(to);
337 }
338
339 if (curr->fts_info == FTS_DP) {
340 /*
341 * We are nearly finished with this directory. If we
342 * didn't actually copy it, or otherwise don't need to
343 * change its attributes, then we are done.
344 */
345 if (!curr->fts_number)
346 continue;
347 /*
348 * If -p is in effect, set all the attributes.
349 * Otherwise, set the correct permissions, limited
350 * by the umask. Optimise by avoiding a chmod()
351 * if possible (which is usually the case if we
352 * made the directory). Note that mkdir() does not
353 * honour setuid, setgid and sticky bits, but we
354 * normally want to preserve them on directories.
355 */
356 if (pflag) {
3abc2185 357 if (setfile(curr->fts_statp, -1))
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358 rval = 1;
359 } else {
360 mode = curr->fts_statp->st_mode;
361 if ((mode & (S_ISUID | S_ISGID | S_ISTXT)) ||
362 ((mode | S_IRWXU) & mask) != (mode & mask))
363 if (chmod(to.p_path, mode & mask) != 0){
364 warn("chmod: %s", to.p_path);
365 rval = 1;
366 }
367 }
368 continue;
369 }
370
371 /* Not an error but need to remember it happened */
372 if (stat(to.p_path, &to_stat) == -1)
373 dne = 1;
374 else {
375 if (to_stat.st_dev == curr->fts_statp->st_dev &&
376 to_stat.st_ino == curr->fts_statp->st_ino) {
377 warnx("%s and %s are identical (not copied).",
378 to.p_path, curr->fts_path);
e10e866a 379 rval = 1;
984263bc 380 if (S_ISDIR(curr->fts_statp->st_mode))
7cfd531a 381 (void)fts_set(ftsp, curr, FTS_SKIP);
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MD
382 continue;
383 }
384 if (!S_ISDIR(curr->fts_statp->st_mode) &&
385 S_ISDIR(to_stat.st_mode)) {
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JM
386 warnx("cannot overwrite directory %s with "
387 "non-directory %s",
984263bc 388 to.p_path, curr->fts_path);
e10e866a 389 rval = 1;
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MD
390 continue;
391 }
392 dne = 0;
393 }
394
395 switch (curr->fts_statp->st_mode & S_IFMT) {
396 case S_IFLNK:
3abc2185
CP
397 /* Catch special case of a non-dangling symlink */
398 if ((fts_options & FTS_LOGICAL) ||
399 ((fts_options & FTS_COMFOLLOW) &&
400 curr->fts_level == 0)) {
401 if (copy_file(curr, dne))
402 badcp = rval = 1;
403 } else {
404 if (copy_link(curr, !dne))
405 badcp = rval = 1;
406 }
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MD
407 break;
408 case S_IFDIR:
7cfd531a 409 if (!Rflag) {
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410 warnx("%s is a directory (not copied).",
411 curr->fts_path);
7cfd531a 412 (void)fts_set(ftsp, curr, FTS_SKIP);
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413 badcp = rval = 1;
414 break;
415 }
416 /*
417 * If the directory doesn't exist, create the new
418 * one with the from file mode plus owner RWX bits,
419 * modified by the umask. Trade-off between being
420 * able to write the directory (if from directory is
421 * 555) and not causing a permissions race. If the
422 * umask blocks owner writes, we fail..
423 */
424 if (dne) {
425 if (mkdir(to.p_path,
426 curr->fts_statp->st_mode | S_IRWXU) < 0)
427 err(1, "%s", to.p_path);
428 } else if (!S_ISDIR(to_stat.st_mode)) {
429 errno = ENOTDIR;
430 err(1, "%s", to.p_path);
431 }
432 /*
433 * Arrange to correct directory attributes later
434 * (in the post-order phase) if this is a new
435 * directory, or if the -p flag is in effect.
436 */
437 curr->fts_number = pflag || dne;
438 break;
439 case S_IFBLK:
440 case S_IFCHR:
441 if (Rflag) {
442 if (copy_special(curr->fts_statp, !dne))
443 badcp = rval = 1;
444 } else {
445 if (copy_file(curr, dne))
446 badcp = rval = 1;
447 }
448 break;
7cfd531a
JM
449 case S_IFSOCK:
450 warnx("%s is a socket (not copied).",
451 curr->fts_path);
452 break;
984263bc
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453 case S_IFIFO:
454 if (Rflag) {
455 if (copy_fifo(curr->fts_statp, !dne))
456 badcp = rval = 1;
457 } else {
458 if (copy_file(curr, dne))
459 badcp = rval = 1;
460 }
461 break;
462 default:
463 if (copy_file(curr, dne))
464 badcp = rval = 1;
465 break;
466 }
467 if (vflag && !badcp)
7cfd531a 468 (void)printf("%s -> %s\n", curr->fts_path, to.p_path);
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469 }
470 if (errno)
471 err(1, "fts_read");
13e85e8e 472 fts_close(ftsp);
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473 return (rval);
474}
475
476/*
477 * mastercmp --
478 * The comparison function for the copy order. The order is to copy
479 * non-directory files before directory files. The reason for this
480 * is because files tend to be in the same cylinder group as their
481 * parent directory, whereas directories tend not to be. Copying the
482 * files first reduces seeking.
483 */
15938dac 484static int
59b616d3 485mastercmp(const FTSENT * const *a, const FTSENT * const *b)
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MD
486{
487 int a_info, b_info;
488
489 a_info = (*a)->fts_info;
490 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
491 return (0);
492 b_info = (*b)->fts_info;
493 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
494 return (0);
495 if (a_info == FTS_D)
496 return (-1);
497 if (b_info == FTS_D)
498 return (1);
499 return (0);
500}
779388d9
SS
501
502static void
7cfd531a 503siginfo(int sig __unused)
779388d9
SS
504{
505
506 info = 1;
507}