1 /* Copyright 2008 Rob Landley <[email protected]>
2 *
3 * See http://opengroup.org/onlinepubs/9699919799/utilities/cp.html
4 * And http://opengroup.org/onlinepubs/9699919799/utilities/mv.html
5 * And http://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic.html#INSTALL
6 *
7 * Posix says "cp -Rf dir file" shouldn't delete file, but our -f does.
8 *
9 * Deviations from posix: -adlnrsvF, --preserve... about half the
10 * functionality in this cp isn't in posix. Posix is stuck in the 1970's.
11 *
12 * TODO: --preserve=links
13 * TODO: what's this _CP_mode system.posix_acl_ business? We chmod()?
14
15 // options shared between mv/cp must be in same order (right to left)
16 // for FLAG macros to work out right in shared infrastructure.
17
18 USE_CP(NEWTOY(cp, "<1(preserve):;D(parents)RHLPprudaslv(verbose)nF(remove-destination)fit:T[-HLPd][-niu][+Rr]", TOYFLAG_BIN))
19 USE_MV(NEWTOY(mv, "<1x(swap)v(verbose)nF(remove-destination)fit:T[-ni]", TOYFLAG_BIN))
20 USE_INSTALL(NEWTOY(install, "<1cdDp(preserve-timestamps)svt:m:o:g:", TOYFLAG_USR|TOYFLAG_BIN))
21
22 config CP
23 bool "cp"
24 default y
25 help
26 usage: cp [-aDdFfHiLlnPpRrsTuv] [--preserve=motcxa] [-t TARGET] SOURCE... [DEST]
27
28 Copy files from SOURCE to DEST. If more than one SOURCE, DEST must
29 be a directory.
30
31 -a Same as -dpr
32 -D Create leading dirs under DEST (--parents)
33 -d Don't dereference symlinks
34 -F Delete any existing DEST first (--remove-destination)
35 -f Delete destination files we can't write to
36 -H Follow symlinks listed on command line
37 -i Interactive, prompt before overwriting existing DEST
38 -L Follow all symlinks
39 -l Hard link instead of copy
40 -n No clobber (don't overwrite DEST)
41 -P Do not follow symlinks
42 -p Preserve timestamps, ownership, and mode
43 -R Recurse into subdirectories (DEST must be a directory)
44 -r Synonym for -R
45 -s Symlink instead of copy
46 -T DEST always treated as file, max 2 arguments
47 -t Copy to TARGET dir (no DEST)
48 -u Update (keep newest mtime)
49 -v Verbose
50
51 Arguments to --preserve are the first letter(s) of:
52
53 mode - permissions (ignore umask for rwx, copy suid and sticky bit)
54 ownership - user and group
55 timestamps - file creation, modification, and access times.
56 context - security context
57 xattr - extended attributes
58 all - all of the above
59
60 config MV
61 bool "mv"
62 default y
63 help
64 usage: mv [-FfinTvx] [-t TARGET] SOURCE... [DEST]
65
66 -F Delete any existing DEST first (--remove-destination)
67 -f Force copy by deleting destination file
68 -i Interactive, prompt before overwriting existing DEST
69 -n No clobber (don't overwrite DEST)
70 -t Move to TARGET dir (no DEST)
71 -T DEST always treated as file, max 2 arguments
72 -v Verbose
73 -x Atomically exchange source/dest (--swap)
74
75 config INSTALL
76 bool "install"
77 default y
78 help
79 usage: install [-dDpsv] [-o USER] [-g GROUP] [-m MODE] [-t TARGET] [SOURCE...] [DEST]
80
81 Copy files and set attributes.
82
83 -d Act like mkdir -p
84 -D Create leading directories for DEST
85 -g Make copy belong to GROUP
86 -m Set permissions to MODE
87 -o Make copy belong to USER
88 -p Preserve timestamps
89 -s Call "strip -p"
90 -t Copy files to TARGET dir (no DEST)
91 -v Verbose
92 */
93
94 #define FORCE_FLAGS
95 #define FOR_cp
96 #include "toys.h"
97
98 GLOBALS(
99 union {
100 // install's options
101 struct {
102 char *g, *o, *m, *t;
103 } i;
104 // cp's options
105 struct {
106 char *t, *preserve;
107 } c;
108 };
109
110 char *destname;
111 struct stat top;
112 int (*callback)(struct dirtree *try);
113 uid_t uid;
114 gid_t gid;
115 int pflags;
116 )
117
118 struct cp_preserve {
119 char *name;
120 } static const cp_preserve[] = TAGGED_ARRAY(CP,
121 {"mode"}, {"ownership"}, {"timestamps"}, {"context"}, {"xattr"},
122 );
123
cp_xattr(int fdin,int fdout,char * file)124 void cp_xattr(int fdin, int fdout, char *file)
125 {
126 ssize_t listlen, len;
127 char *name, *value, *list;
128
129 if (!(TT.pflags&(_CP_xattr|_CP_context))) return;
130 if ((listlen = xattr_flist(fdin, 0, 0))<1) return;
131
132 list = xmalloc(listlen);
133 xattr_flist(fdin, list, listlen);
134 for (name = list; name-list < listlen; name += strlen(name)+1) {
135 // context copies security, xattr copies everything else
136 len = strncmp(name, "security.", 9) ? _CP_xattr : _CP_context;
137 if (!(TT.pflags&len)) continue;
138 if ((len = xattr_fget(fdin, name, 0, 0))>0) {
139 value = xmalloc(len);
140 if (len == xattr_fget(fdin, name, value, len))
141 if (xattr_fset(fdout, name, value, len, 0))
142 perror_msg("%s setxattr(%s=%s)", file, name, value);
143 free(value);
144 }
145 }
146 free(list);
147 }
148
149 // Callback from dirtree_read() for each file/directory under a source dir.
150
151 // traverses two directories in parallel: try->dirfd is source dir,
152 // try->extra is dest dir. TODO: filehandle exhaustion?
153
cp_node(struct dirtree * try)154 static int cp_node(struct dirtree *try)
155 {
156 int fdout = -1, cfd = try->parent ? try->parent->extra : AT_FDCWD,
157 save = DIRTREE_SAVE*(CFG_MV && *toys.which->name == 'm'), rc = 0, rr = 0,
158 tfd = dirtree_parentfd(try);
159 char *s = 0, *catch = try->parent ? try->name : TT.destname, *err = "%s";
160 struct stat cst;
161
162 if (!dirtree_notdotdot(try)) return 0;
163
164 // If returning from COMEAGAIN, jump straight to -p logic at end.
165 if (S_ISDIR(try->st.st_mode) && (try->again&DIRTREE_COMEAGAIN)) {
166 fdout = try->extra;
167 err = 0;
168
169 // If mv child had a problem, free data and don't try to delete parent dir.
170 if (try->child) {
171 save = 0;
172 llist_traverse(try->child, free);
173 }
174
175 cp_xattr(try->dirfd, try->extra, catch);
176 } else {
177 // -d is only the same as -r for symlinks, not for directories
178 if (S_ISLNK(try->st.st_mode) && FLAG(d)) rr++;
179
180 // Detect recursive copies via repeated top node (cp -R .. .) or
181 // identical source/target (fun with hardlinks).
182 if ((same_file(&TT.top, &try->st) && (catch = TT.destname))
183 || (!fstatat(cfd, catch, &cst, 0) && same_file(&cst, &try->st)))
184 {
185 error_msg("'%s' is '%s'", catch, err = dirtree_path(try, 0));
186 free(err);
187
188 return save;
189 }
190
191 // Handle -inuvF
192 if (!faccessat(cfd, catch, F_OK, 0) && !S_ISDIR(cst.st_mode)) {
193 if (S_ISDIR(try->st.st_mode))
194 error_msg("dir at '%s'", s = dirtree_path(try, 0));
195 else if (FLAG(F) && unlinkat(cfd, catch, 0))
196 error_msg("unlink '%s'", catch);
197 else if (FLAG(i)) {
198 fprintf(stderr, "%s: overwrite '%s'", toys.which->name, catch);
199 if (yesno(0)) rc++;
200 } else if (!(FLAG(u) && nanodiff(&try->st.st_mtim, &cst.st_mtim)>0)
201 && !FLAG(n)) rc++;
202 free(s);
203 if (!rc) return save;
204 }
205
206 if (FLAG(v)) {
207 printf("%s '%s' -> '%s'\n", toys.which->name, s = dirtree_path(try, 0),
208 catch);
209 free(s);
210 }
211
212 // Loop for -f retry after unlink
213 do {
214 int ii, fdin = -1;
215
216 // directory, hardlink, symlink, mknod (char, block, fifo, socket), file
217
218 // Copy directory
219
220 if (S_ISDIR(try->st.st_mode)) {
221 struct stat st2;
222
223 if (!FLAG(a) && !FLAG(r) && !rr) {
224 err = "Skipped dir '%s'";
225 catch = try->name;
226 break;
227 }
228
229 // Always make directory writeable to us, so we can create files in it.
230 //
231 // Yes, there's a race window between mkdir() and open() so it's
232 // possible that -p can be made to chown a directory other than the one
233 // we created. The closest we can do to closing this is make sure
234 // that what we open _is_ a directory rather than something else.
235
236 if (!mkdirat(cfd, catch, try->st.st_mode | 0200) || errno == EEXIST)
237 if (-1 != (try->extra = openat(cfd, catch, O_NOFOLLOW)))
238 if (!fstat(try->extra, &st2) && S_ISDIR(st2.st_mode))
239 return DIRTREE_COMEAGAIN | DIRTREE_SYMFOLLOW*FLAG(L);
240
241 // Hardlink
242
243 } else if (FLAG(l)) {
244 if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
245
246 // Copy tree as symlinks. For non-absolute paths this involves
247 // appending the right number of .. entries as you go down the tree.
248
249 } else if (FLAG(s)) {
250 char *s, *s2;
251 struct dirtree *or;
252
253 s = dirtree_path(try, 0);
254 for (ii = 0, or = try; or->parent; or = or->parent) ii++;
255 if (*or->name == '/') ii = 0;
256 if (ii) {
257 s2 = xmprintf("%*c%s", 3*ii, ' ', s);
258 free(s);
259 s = s2;
260 while(ii--) {
261 memcpy(s2, "../", 3);
262 s2 += 3;
263 }
264 }
265 if (!symlinkat(s, cfd, catch)) {
266 err = 0;
267 fdout = AT_FDCWD;
268 }
269 free(s);
270
271 // Do something _other_ than copy contents of a file?
272 } else if (!S_ISREG(try->st.st_mode)
273 && (try->parent||FLAG(a)||FLAG(P)||FLAG(r)||rr))
274 {
275 // make symlink, or make block/char/fifo/socket
276 if (S_ISLNK(try->st.st_mode)
277 ? readlinkat0(tfd, try->name, toybuf, sizeof(toybuf)) &&
278 (!unlinkat(cfd, catch, 0) || ENOENT == errno) &&
279 !symlinkat(toybuf, cfd, catch)
280 : !mknodat(cfd, catch, try->st.st_mode, try->st.st_rdev))
281 {
282 err = 0;
283 fdout = AT_FDCWD;
284 }
285
286 // Copy contents of file.
287 } else {
288 fdin = openat(tfd, try->name, O_RDONLY);
289 if (fdin < 0) {
290 catch = try->name;
291 break;
292 }
293
294 // When copying contents use symlink target's attributes
295 if (S_ISLNK(try->st.st_mode)) fstat(fdin, &try->st);
296 fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
297 if (fdout >= 0) {
298 xsendfile(fdin, fdout);
299 err = 0;
300 }
301
302 cp_xattr(fdin, fdout, catch);
303 }
304 if (fdin != -1) close(fdin);
305 } while (err && (FLAG(f)||FLAG(n)) && !unlinkat(cfd, catch, 0));
306 }
307
308 // Did we make a thing?
309 if (fdout != -1) {
310 // Inability to set --preserve isn't fatal, some require root access.
311
312 // ownership
313 if (TT.pflags & _CP_ownership) {
314
315 // permission bits already correct for mknod and don't apply to symlink
316 // If we can't get a filehandle to the actual object, use racy functions
317 if (fdout == AT_FDCWD)
318 rc = fchownat(cfd, catch, try->st.st_uid, try->st.st_gid,
319 AT_SYMLINK_NOFOLLOW);
320 else rc = fchown(fdout, try->st.st_uid, try->st.st_gid);
321 if (rc && !geteuid()) {
322 char *pp;
323
324 perror_msg("chown '%s'", pp = dirtree_path(try, 0));
325 free(pp);
326 }
327 }
328
329 // timestamp
330 if (TT.pflags & _CP_timestamps) {
331 struct timespec times[] = {try->st.st_atim, try->st.st_mtim};
332
333 if (fdout == AT_FDCWD) utimensat(cfd, catch, times, AT_SYMLINK_NOFOLLOW);
334 else futimens(fdout, times);
335 }
336
337 // mode comes last because other syscalls can strip suid bit
338 if (fdout != AT_FDCWD) {
339 if (TT.pflags & _CP_mode) fchmod(fdout, try->st.st_mode);
340 xclose(fdout);
341 }
342
343 if (save)
344 if (unlinkat(tfd, try->name, S_ISDIR(try->st.st_mode) ? AT_REMOVEDIR :0))
345 err = "%s";
346 }
347
348 if (err) {
349 if (catch == try->name) {
350 s = dirtree_path(try, 0);
351 while (try->parent) try = try->parent;
352 catch = xmprintf("%s%s", TT.destname, s+strlen(try->name));
353 free(s);
354 s = catch;
355 } else s = 0;
356 perror_msg(err, catch);
357 free(s);
358 }
359
360 return 0;
361 }
362
cp_main(void)363 void cp_main(void)
364 {
365 char *tt = *toys.which->name == 'i' ? TT.i.t : TT.c.t,
366 *destname = tt ? : toys.optargs[--toys.optc];
367 int i, destdir = !stat(destname, &TT.top);
368
369 if (!toys.optc) error_exit("Needs 2 arguments");
370 if (!destdir && errno==ENOENT && FLAG(D)) {
371 if (tt && mkpathat(AT_FDCWD, tt, 0777, MKPATHAT_MAKE|MKPATHAT_MKLAST))
372 perror_exit("-t '%s'", tt);
373 destdir = 1;
374 } else {
375 destdir = destdir && S_ISDIR(TT.top.st_mode);
376 if (!destdir && (toys.optc>1 || FLAG(D) || tt))
377 error_exit("'%s' not directory", destname);
378 }
379
380 if (FLAG(T)) {
381 if (toys.optc>1) help_exit("Max 2 arguments");
382 if (destdir) error_exit("'%s' is a directory", destname);
383 }
384
385 if (FLAG(a)||FLAG(p)) TT.pflags = _CP_mode|_CP_ownership|_CP_timestamps;
386
387 // Not using comma_args() (yet?) because interpeting as letters.
388 if (FLAG(preserve)) {
389 char *pre = xstrdup(TT.c.preserve ? TT.c.preserve : "mot"), *s;
390
391 if (comma_remove(pre, "all")) TT.pflags = ~0;
392 for (i=0; i<ARRAY_LEN(cp_preserve); i++)
393 while (comma_remove(pre, cp_preserve[i].name)) TT.pflags |= 1<<i;
394 if (*pre) {
395
396 // Try to interpret as letters, commas won't set anything this doesn't.
397 for (s = pre; *s; s++) {
398 for (i=0; i<ARRAY_LEN(cp_preserve); i++)
399 if (*s == *cp_preserve[i].name) break;
400 if (i == ARRAY_LEN(cp_preserve)) {
401 if (*s == 'a') TT.pflags = ~0;
402 else break;
403 } else TT.pflags |= 1<<i;
404 }
405
406 if (*s) error_exit("bad --preserve=%s", pre);
407 }
408 free(pre);
409 }
410 if (TT.pflags & _CP_mode) umask(0);
411 if (!TT.callback) TT.callback = cp_node;
412
413 // Loop through sources
414 for (i=0; i<toys.optc; i++) {
415 char *src = toys.optargs[i], *trail;
416 int send = 1;
417
418 if (!(trail = strrchr(src, '/')) || trail[1]) trail = 0;
419 else while (trail>src && *trail=='/') *trail-- = 0;
420
421 if (destdir) {
422 char *s = FLAG(D) ? src : getbasename(src);
423
424 TT.destname = xmprintf("%s/%s", destname, s);
425 if (FLAG(D)) {
426 if (!(s = fileunderdir(TT.destname, destname))) {
427 error_msg("%s not under %s", TT.destname, destname);
428 continue;
429 }
430 // TODO: .. follows abspath, not links...
431 free(s);
432 mkpath(TT.destname);
433 }
434 } else TT.destname = destname;
435
436 // "mv across devices" triggers cp fallback path, so set that as default
437 errno = EXDEV;
438 if (CFG_MV && *toys.which->name == 'm') {
439 if (!FLAG(f) || FLAG(n)) {
440 struct stat st;
441 int exists = !stat(TT.destname, &st);
442
443 // Prompt if -i or file isn't writable. Technically "is writable" is
444 // more complicated (022 is not writeable by the owner, just everybody
445 // _else_) but I don't care.
446 if (exists && (FLAG(i) || (!(st.st_mode & 0222) && isatty(0)))) {
447 fprintf(stderr, "%s: overwrite '%s'", toys.which->name, TT.destname);
448 if (!yesno(0)) send = 0;
449 else unlink(TT.destname);
450 }
451 // if -n and dest exists, don't try to rename() or copy
452 if (exists && FLAG(n)) send = 0;
453 }
454 if (send) send = rename(src, TT.destname);
455 if (trail) trail[1] = '/';
456 }
457
458 // Copy if we didn't mv or hit an error, skipping nonexistent sources
459 if (send) {
460 if (errno!=EXDEV || dirtree_flagread(src, DIRTREE_SHUTUP+
461 DIRTREE_SYMFOLLOW*(FLAG(H)|FLAG(L)), TT.callback))
462 perror_msg("bad '%s'", src);
463 }
464 if (destdir) free(TT.destname);
465 }
466 }
467
468 // Export cp's flags into mv and install flag context.
469
cp_flag_F(void)470 static inline int cp_flag_F(void) { return FLAG_F; }
cp_flag_p(void)471 static inline int cp_flag_p(void) { return FLAG_p; }
cp_flag_v(void)472 static inline int cp_flag_v(void) { return FLAG_v; }
cp_flag_dpr(void)473 static inline int cp_flag_dpr(void) { return FLAG_d|FLAG_p|FLAG_r; }
474
475 #define FOR_mv
476 #include <generated/flags.h>
477
mv_main(void)478 void mv_main(void)
479 {
480 toys.optflags |= cp_flag_dpr();
481 TT.pflags =~0;
482
483 if (FLAG(x)) {
484 if (toys.optc != 2) error_exit("-x needs 2 args");
485 if (rename_exchange(toys.optargs[0], toys.optargs[1]))
486 perror_exit("-x %s %s", toys.optargs[0], toys.optargs[1]);
487 } else cp_main();
488 }
489
490 #define FOR_install
491 #include <generated/flags.h>
492
install_node(struct dirtree * try)493 static int install_node(struct dirtree *try)
494 {
495 try->st.st_mode = TT.i.m ? string_to_mode(TT.i.m, try->st.st_mode) : 0755;
496 if (TT.i.g) try->st.st_gid = TT.gid;
497 if (TT.i.o) try->st.st_uid = TT.uid;
498
499 // Always returns 0 because no -r
500 cp_node(try);
501
502 // No -r so always one level deep, so destname as set by cp_node() is correct
503 if (FLAG(s) && xrun((char *[]){"strip", "-p", TT.destname, 0}))
504 toys.exitval = 1;
505
506 return 0;
507 }
508
install_main(void)509 void install_main(void)
510 {
511 char **ss;
512
513 TT.uid = TT.i.o ? xgetuid(TT.i.o) : -1;
514 TT.gid = TT.i.g ? xgetgid(TT.i.g) : -1;
515
516 if (FLAG(d)) {
517 int mode = TT.i.m ? string_to_mode(TT.i.m, 0) : 0755;
518
519 for (ss = toys.optargs; *ss; ss++) {
520 if (FLAG(v)) printf("%s\n", *ss);
521 if (mkpathat(AT_FDCWD, *ss, mode, MKPATHAT_MKLAST | MKPATHAT_MAKE))
522 perror_msg_raw(*ss);
523 if (FLAG(g)||FLAG(o))
524 if (lchown(*ss, TT.uid, TT.gid)) perror_msg("chown '%s'", *ss);
525 if ((mode&~01777) && chmod(*ss, mode)) perror_msg("chmod '%s'", *ss);
526 }
527
528 return;
529 }
530
531 if (FLAG(D)) {
532 char *destname = TT.i.t ? : (TT.destname = toys.optargs[toys.optc-1]);
533 if (mkpathat(AT_FDCWD, destname, 0777, MKPATHAT_MAKE|MKPATHAT_MKLAST*FLAG(t)))
534 perror_exit("-D '%s'", destname);
535 if (toys.optc == !FLAG(t)) return;
536 }
537
538 // Translate flags from install to cp
539 toys.optflags = cp_flag_F() + cp_flag_v()*FLAG(v)
540 + cp_flag_p()*(FLAG(p)|FLAG(o)|FLAG(g));
541
542 TT.callback = install_node;
543 cp_main();
544 }
545