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, "<2"USE_CP_PRESERVE("(preserve):;")"RHLPprdaslvnF(remove-destination)fi[-HLPd][-ni]", TOYFLAG_BIN))
19 USE_MV(NEWTOY(mv, "<2vnF(remove-destination)fi[-ni]", TOYFLAG_BIN))
20 USE_INSTALL(NEWTOY(install, "<1cdDpsvm:o:g:", TOYFLAG_USR|TOYFLAG_BIN))
21
22 config CP
23 bool "cp"
24 default y
25 help
26 usage: cp [-adlnrsvfipRHLP] SOURCE... DEST
27
28 Copy files from SOURCE to DEST. If more than one SOURCE, DEST must
29 be a directory.
30
31 -f delete destination files we can't write to
32 -F delete any existing destination file first (--remove-destination)
33 -i interactive, prompt before overwriting existing DEST
34 -p preserve timestamps, ownership, and mode
35 -R recurse into subdirectories (DEST must be a directory)
36 -H Follow symlinks listed on command line
37 -L Follow all symlinks
38 -P Do not follow symlinks [default]
39 -a same as -dpr
40 -d don't dereference symlinks
41 -l hard link instead of copy
42 -n no clobber (don't overwrite DEST)
43 -r synonym for -R
44 -s symlink instead of copy
45 -v verbose
46
47 config CP_PRESERVE
48 bool "cp --preserve support"
49 default y
50 depends on CP
51 help
52 usage: cp [--preserve=motcxa]
53
54 --preserve takes either a comma separated list of attributes, or the first
55 letter(s) of:
56
57 mode - permissions (ignore umask for rwx, copy suid and sticky bit)
58 ownership - user and group
59 timestamps - file creation, modification, and access times.
60 context - security context
61 xattr - extended attributes
62 all - all of the above
63
64 config MV
65 bool "mv"
66 default y
67 help
68 usage: mv [-fivn] SOURCE... DEST"
69
70 -f force copy by deleting destination file
71 -i interactive, prompt before overwriting existing DEST
72 -v verbose
73 -n no clobber (don't overwrite DEST)
74
75 config INSTALL
76 bool "install"
77 default y
78 help
79 usage: install [-dDpsv] [-o USER] [-g GROUP] [-m MODE] [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 -v Verbose
91 */
92
93 #define FORCE_FLAGS
94 #define FOR_cp
95 #include "toys.h"
96
97 GLOBALS(
98 union {
99 struct {
100 // install's options
101 char *group;
102 char *user;
103 char *mode;
104 } i;
105 struct {
106 char *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
124 // Callback from dirtree_read() for each file/directory under a source dir.
125
cp_node(struct dirtree * try)126 static int cp_node(struct dirtree *try)
127 {
128 int fdout = -1, cfd = try->parent ? try->parent->extra : AT_FDCWD,
129 tfd = dirtree_parentfd(try);
130 unsigned flags = toys.optflags;
131 char *catch = try->parent ? try->name : TT.destname, *err = "%s";
132 struct stat cst;
133
134 if (!dirtree_notdotdot(try)) return 0;
135
136 // If returning from COMEAGAIN, jump straight to -p logic at end.
137 if (S_ISDIR(try->st.st_mode) && try->again) {
138 fdout = try->extra;
139 err = 0;
140 } else {
141
142 // -d is only the same as -r for symlinks, not for directories
143 if (S_ISLNK(try->st.st_mode) && (flags & FLAG_d)) flags |= FLAG_r;
144
145 // Detect recursive copies via repeated top node (cp -R .. .) or
146 // identical source/target (fun with hardlinks).
147 if ((TT.top.st_dev == try->st.st_dev && TT.top.st_ino == try->st.st_ino
148 && (catch = TT.destname))
149 || (!fstatat(cfd, catch, &cst, 0) && cst.st_dev == try->st.st_dev
150 && cst.st_ino == try->st.st_ino))
151 {
152 error_msg("'%s' is '%s'", catch, err = dirtree_path(try, 0));
153 free(err);
154
155 return 0;
156 }
157
158 // Handle -invF
159
160 if (!faccessat(cfd, catch, F_OK, 0) && !S_ISDIR(cst.st_mode)) {
161 char *s;
162
163 if (S_ISDIR(try->st.st_mode)) {
164 error_msg("dir at '%s'", s = dirtree_path(try, 0));
165 free(s);
166 return 0;
167 } else if ((flags & FLAG_F) && unlinkat(cfd, catch, 0)) {
168 error_msg("unlink '%s'", catch);
169 return 0;
170 } else if (flags & FLAG_n) return 0;
171 else if (flags & FLAG_i) {
172 fprintf(stderr, "%s: overwrite '%s'", toys.which->name,
173 s = dirtree_path(try, 0));
174 free(s);
175 if (!yesno(1)) return 0;
176 }
177 }
178
179 if (flags & FLAG_v) {
180 char *s = dirtree_path(try, 0);
181 printf("%s '%s'\n", toys.which->name, s);
182 free(s);
183 }
184
185 // Loop for -f retry after unlink
186 do {
187
188 // directory, hardlink, symlink, mknod (char, block, fifo, socket), file
189
190 // Copy directory
191
192 if (S_ISDIR(try->st.st_mode)) {
193 struct stat st2;
194
195 if (!(flags & (FLAG_a|FLAG_r|FLAG_R))) {
196 err = "Skipped dir '%s'";
197 catch = try->name;
198 break;
199 }
200
201 // Always make directory writeable to us, so we can create files in it.
202 //
203 // Yes, there's a race window between mkdir() and open() so it's
204 // possible that -p can be made to chown a directory other than the one
205 // we created. The closest we can do to closing this is make sure
206 // that what we open _is_ a directory rather than something else.
207
208 if (!mkdirat(cfd, catch, try->st.st_mode | 0200) || errno == EEXIST)
209 if (-1 != (try->extra = openat(cfd, catch, O_NOFOLLOW)))
210 if (!fstat(try->extra, &st2) && S_ISDIR(st2.st_mode))
211 return DIRTREE_COMEAGAIN
212 | (DIRTREE_SYMFOLLOW*!!(toys.optflags&FLAG_L));
213
214 // Hardlink
215
216 } else if (flags & FLAG_l) {
217 if (!linkat(tfd, try->name, cfd, catch, 0)) err = 0;
218
219 // Copy tree as symlinks. For non-absolute paths this involves
220 // appending the right number of .. entries as you go down the tree.
221
222 } else if (flags & FLAG_s) {
223 char *s;
224 struct dirtree *or;
225 int dotdots = 0;
226
227 s = dirtree_path(try, 0);
228 for (or = try; or->parent; or = or->parent) dotdots++;
229
230 if (*or->name == '/') dotdots = 0;
231 if (dotdots) {
232 char *s2 = xmprintf("%*c%s", 3*dotdots, ' ', s);
233 free(s);
234 s = s2;
235 while(dotdots--) {
236 memcpy(s2, "../", 3);
237 s2 += 3;
238 }
239 }
240 if (!symlinkat(s, cfd, catch)) {
241 err = 0;
242 fdout = AT_FDCWD;
243 }
244 free(s);
245
246 // Do something _other_ than copy contents of a file?
247 } else if (!S_ISREG(try->st.st_mode)
248 && (try->parent || (flags & (FLAG_a|FLAG_r))))
249 {
250 int i;
251
252 // make symlink, or make block/char/fifo/socket
253 if (S_ISLNK(try->st.st_mode)
254 ? ((i = readlinkat0(tfd, try->name, toybuf, sizeof(toybuf))) &&
255 !symlinkat(toybuf, cfd, catch))
256 : !mknodat(cfd, catch, try->st.st_mode, try->st.st_rdev))
257 {
258 err = 0;
259 fdout = AT_FDCWD;
260 }
261
262 // Copy contents of file.
263 } else {
264 int fdin;
265
266 fdin = openat(tfd, try->name, O_RDONLY);
267 if (fdin < 0) {
268 catch = try->name;
269 break;
270 }
271 fdout = openat(cfd, catch, O_RDWR|O_CREAT|O_TRUNC, try->st.st_mode);
272 if (fdout >= 0) {
273 xsendfile(fdin, fdout);
274 err = 0;
275 }
276
277 // We only copy xattrs for files because there's no flistxattrat()
278 if (TT.pflags&(_CP_xattr|_CP_context)) {
279 ssize_t listlen = flistxattr(fdin, 0, 0), len;
280 char *name, *value, *list;
281
282 if (listlen>0) {
283 list = xmalloc(listlen);
284 flistxattr(fdin, list, listlen);
285 list[listlen-1] = 0; // I do not trust this API.
286 for (name = list; name-list < listlen; name += strlen(name)+1) {
287 if (!(TT.pflags&_CP_xattr) && strncmp(name, "security.", 9))
288 continue;
289 if ((len = fgetxattr(fdin, name, 0, 0))>0) {
290 value = xmalloc(len);
291 if (len == fgetxattr(fdin, name, value, len))
292 if (fsetxattr(fdout, name, value, len, 0))
293 perror_msg("%s setxattr(%s=%s)", catch, name, value);
294 free(value);
295 }
296 }
297 free(list);
298 }
299 }
300
301 close(fdin);
302 }
303 } while (err && (flags & (FLAG_f|FLAG_n)) && !unlinkat(cfd, catch, 0));
304 }
305
306 // Did we make a thing?
307 if (fdout != -1) {
308 int rc;
309
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 (CFG_MV && toys.which->name[0] == 'm')
344 if (unlinkat(tfd, try->name, S_ISDIR(try->st.st_mode) ? AT_REMOVEDIR :0))
345 err = "%s";
346 }
347
348 if (err) {
349 char *f = 0;
350
351 if (catch == try->name) {
352 f = dirtree_path(try, 0);
353 while (try->parent) try = try->parent;
354 catch = xmprintf("%s%s", TT.destname, f+strlen(try->name));
355 free(f);
356 f = catch;
357 }
358 perror_msg(err, catch);
359 free(f);
360 }
361 return 0;
362 }
363
cp_main(void)364 void cp_main(void)
365 {
366 char *destname = toys.optargs[--toys.optc];
367 int i, destdir = !stat(destname, &TT.top) && S_ISDIR(TT.top.st_mode);
368
369 if (toys.optc>1 && !destdir) error_exit("'%s' not directory", destname);
370
371 if (toys.optflags & (FLAG_a|FLAG_p)) {
372 TT.pflags = CP_mode|CP_ownership|CP_timestamps;
373 umask(0);
374 }
375 // Not using comma_args() (yet?) because interpeting as letters.
376 if (CFG_CP_PRESERVE && (toys.optflags & FLAG_preserve)) {
377 char *pre = xstrdup(TT.c.preserve), *s;
378
379 if (comma_scan(pre, "all", 1)) TT.pflags = ~0;
380 for (i=0; i<ARRAY_LEN(cp_preserve); i++)
381 if (comma_scan(pre, cp_preserve[i].name, 1)) TT.pflags |= 1<<i;
382 if (*pre) {
383
384 // Try to interpret as letters, commas won't set anything this doesn't.
385 for (s = TT.c.preserve; *s; s++) {
386 for (i=0; i<ARRAY_LEN(cp_preserve); i++)
387 if (*s == *cp_preserve[i].name) break;
388 if (i == ARRAY_LEN(cp_preserve)) {
389 if (*s == 'a') TT.pflags = ~0;
390 else break;
391 } else TT.pflags |= 1<<i;
392 }
393
394 if (*s) error_exit("bad --preserve=%s", pre);
395 }
396 free(pre);
397 }
398 if (!TT.callback) TT.callback = cp_node;
399
400 // Loop through sources
401 for (i=0; i<toys.optc; i++) {
402 char *src = toys.optargs[i];
403 int rc = 1;
404
405 if (destdir) TT.destname = xmprintf("%s/%s", destname, basename(src));
406 else TT.destname = destname;
407
408 errno = EXDEV;
409 if (CFG_MV && toys.which->name[0] == 'm') {
410 int force = toys.optflags & FLAG_f, no_clobber = toys.optflags & FLAG_n;
411
412 if (!force || no_clobber) {
413 struct stat st;
414 int exists = !stat(TT.destname, &st);
415
416 // Prompt if -i or file isn't writable. Technically "is writable" is
417 // more complicated (022 is not writeable by the owner, just everybody
418 // _else_) but I don't care.
419 if (exists && ((toys.optflags & FLAG_i) || !(st.st_mode & 0222))) {
420 fprintf(stderr, "%s: overwrite '%s'", toys.which->name, TT.destname);
421 if (!yesno(1)) rc = 0;
422 else unlink(TT.destname);
423 }
424 // if -n and dest exists, don't try to rename() or copy
425 if (exists && no_clobber) rc = 0;
426 }
427 if (rc) rc = rename(src, TT.destname);
428 }
429
430 // Copy if we didn't mv, skipping nonexistent sources
431 if (rc) {
432 if (errno!=EXDEV || dirtree_flagread(src, DIRTREE_SHUTUP+
433 DIRTREE_SYMFOLLOW*!!(toys.optflags&(FLAG_H|FLAG_L)), TT.callback))
434 perror_msg("bad '%s'", src);
435 }
436 if (destdir) free(TT.destname);
437 }
438 }
439
mv_main(void)440 void mv_main(void)
441 {
442 toys.optflags |= FLAG_d|FLAG_p|FLAG_R;
443
444 cp_main();
445 }
446
447 // Export cp flags into install's flag context.
448
cp_flag_F(void)449 static inline int cp_flag_F(void) { return FLAG_F; };
cp_flag_p(void)450 static inline int cp_flag_p(void) { return FLAG_p; };
cp_flag_v(void)451 static inline int cp_flag_v(void) { return FLAG_v; };
452
453 // Switch to install's flag context
454 #define CLEANUP_cp
455 #define FOR_install
456 #include <generated/flags.h>
457
install_node(struct dirtree * try)458 static int install_node(struct dirtree *try)
459 {
460 try->st.st_mode = (TT.i.mode)
461 ? string_to_mode(TT.i.mode, try->st.st_mode) : 0755;
462 if (TT.i.group) try->st.st_gid = TT.gid;
463 if (TT.i.user) try->st.st_uid = TT.uid;
464
465 // Always returns 0 because no -r
466 cp_node(try);
467
468 // No -r so always one level deep, so destname as set by cp_node() is correct
469 if (toys.optflags & FLAG_s)
470 if (xrun((char *[]){"strip", "-p", TT.destname, 0})) toys.exitval = 1;
471
472 return 0;
473 }
474
install_main(void)475 void install_main(void)
476 {
477 char **ss;
478 int flags = toys.optflags;
479
480 if (flags & FLAG_d) {
481 for (ss = toys.optargs; *ss; ss++) {
482 if (mkpathat(AT_FDCWD, *ss, 0777, 3)) perror_msg_raw(*ss);
483 if (flags & FLAG_v) printf("%s\n", *ss);
484 }
485
486 return;
487 }
488
489 if (toys.optflags & FLAG_D) {
490 TT.destname = toys.optargs[toys.optc-1];
491 if (mkpathat(AT_FDCWD, TT.destname, 0, 2))
492 perror_exit("-D '%s'", TT.destname);
493 if (toys.optc == 1) return;
494 }
495 if (toys.optc < 2) error_exit("needs 2 args");
496
497 // Translate flags from install to cp
498 toys.optflags = cp_flag_F();
499 if (flags & FLAG_v) toys.optflags |= cp_flag_v();
500 if (flags & (FLAG_p|FLAG_o|FLAG_g)) toys.optflags |= cp_flag_p();
501
502 if (TT.i.user) TT.uid = xgetuid(TT.i.user);
503 if (TT.i.group) TT.gid = xgetgid(TT.i.group);
504
505 TT.callback = install_node;
506 cp_main();
507 }
508