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