1 /*
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 * %sccs.include.redist.c%
9 */
10
11 #ifndef lint
12 static char copyright[] =
13 "@(#) Copyright (c) 1988, 1993, 1994\n\
14 The Regents of the University of California. All rights reserved.\n";
15 #endif /* not lint */
16
17 #ifndef lint
18 static char sccsid[] = "@(#)cp.c 8.5 (Berkeley) 04/29/95";
19 #endif /* not lint */
20
21 /*
22 * Cp copies source files to target files.
23 *
24 * The global PATH_T structure "to" always contains the path to the
25 * current target file. Since fts(3) does not change directories,
26 * this path can be either absolute or dot-relative.
27 *
28 * The basic algorithm is to initialize "to" and use fts(3) to traverse
29 * the file hierarchy rooted in the argument list. A trivial case is the
30 * case of 'cp file1 file2'. The more interesting case is the case of
31 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
32 * path (relative to the root of the traversal) is appended to dir (stored
33 * in "to") to form the final target path.
34 */
35
36 #include <sys/param.h>
37 #include <sys/stat.h>
38 #include <sys/mman.h>
39 #include <sys/time.h>
40
41 #include <dirent.h>
42 #include <err.h>
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <fts.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <string.h>
49 #include <unistd.h>
50
51 #include "extern.h"
52
53 #define STRIP_TRAILING_SLASH(p) { \
54 while ((p).p_end > (p).p_path && (p).p_end[-1] == '/') \
55 *--(p).p_end = 0; \
56 }
57
58 PATH_T to = { to.p_path, "" };
59
60 uid_t myuid;
61 int Rflag, iflag, pflag, rflag;
62 int myumask;
63
64 enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
65
66 int copy __P((char *[], enum op, int));
67 int mastercmp __P((const FTSENT **, const FTSENT **));
68
69 int
main(argc,argv)70 main(argc, argv)
71 int argc;
72 char *argv[];
73 {
74 struct stat to_stat, tmp_stat;
75 enum op type;
76 int Hflag, Lflag, Pflag, ch, fts_options, r;
77 char *target;
78
79 Hflag = Lflag = Pflag = Rflag = 0;
80 while ((ch = getopt(argc, argv, "HLPRfipr")) != EOF)
81 switch (ch) {
82 case 'H':
83 Hflag = 1;
84 Lflag = Pflag = 0;
85 break;
86 case 'L':
87 Lflag = 1;
88 Hflag = Pflag = 0;
89 break;
90 case 'P':
91 Pflag = 1;
92 Hflag = Lflag = 0;
93 break;
94 case 'R':
95 Rflag = 1;
96 break;
97 case 'f':
98 iflag = 0;
99 break;
100 case 'i':
101 iflag = isatty(fileno(stdin));
102 break;
103 case 'p':
104 pflag = 1;
105 break;
106 case 'r':
107 rflag = 1;
108 break;
109 case '?':
110 default:
111 usage();
112 break;
113 }
114 argc -= optind;
115 argv += optind;
116
117 if (argc < 2)
118 usage();
119
120 fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
121 if (rflag) {
122 if (Rflag)
123 errx(1,
124 "the -R and -r options may not be specified together.");
125 if (Hflag || Lflag || Pflag)
126 errx(1,
127 "the -H, -L, and -P options may not be specified with the -r option.");
128 fts_options &= ~FTS_PHYSICAL;
129 fts_options |= FTS_LOGICAL;
130 }
131 if (Rflag) {
132 if (Hflag)
133 fts_options |= FTS_COMFOLLOW;
134 if (Lflag) {
135 fts_options &= ~FTS_PHYSICAL;
136 fts_options |= FTS_LOGICAL;
137 }
138 } else {
139 fts_options &= ~FTS_PHYSICAL;
140 fts_options |= FTS_LOGICAL;
141 }
142
143 myuid = getuid();
144
145 /* Copy the umask for explicit mode setting. */
146 myumask = umask(0);
147 (void)umask(myumask);
148
149 /* Save the target base in "to". */
150 target = argv[--argc];
151 if (strlen(target) > MAXPATHLEN)
152 errx(1, "%s: name too long", target);
153 (void)strcpy(to.p_path, target);
154 to.p_end = to.p_path + strlen(to.p_path);
155 if (to.p_path == to.p_end) {
156 *to.p_end++ = '.';
157 *to.p_end = 0;
158 }
159 STRIP_TRAILING_SLASH(to);
160 to.target_end = to.p_end;
161
162 /* Set end of argument list for fts(3). */
163 argv[argc] = NULL;
164
165 /*
166 * Cp has two distinct cases:
167 *
168 * cp [-R] source target
169 * cp [-R] source1 ... sourceN directory
170 *
171 * In both cases, source can be either a file or a directory.
172 *
173 * In (1), the target becomes a copy of the source. That is, if the
174 * source is a file, the target will be a file, and likewise for
175 * directories.
176 *
177 * In (2), the real target is not directory, but "directory/source".
178 */
179 r = stat(to.p_path, &to_stat);
180 if (r == -1 && errno != ENOENT)
181 err(1, "%s", to.p_path);
182 if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
183 /*
184 * Case (1). Target is not a directory.
185 */
186 if (argc > 1) {
187 usage();
188 exit(1);
189 }
190 /*
191 * Need to detect the case:
192 * cp -R dir foo
193 * Where dir is a directory and foo does not exist, where
194 * we want pathname concatenations turned on but not for
195 * the initial mkdir().
196 */
197 if (r == -1) {
198 if (rflag || (Rflag && (Lflag || Hflag)))
199 stat(*argv, &tmp_stat);
200 else
201 lstat(*argv, &tmp_stat);
202
203 if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
204 type = DIR_TO_DNE;
205 else
206 type = FILE_TO_FILE;
207 } else
208 type = FILE_TO_FILE;
209 } else
210 /*
211 * Case (2). Target is a directory.
212 */
213 type = FILE_TO_DIR;
214
215 exit (copy(argv, type, fts_options));
216 }
217
218 int
copy(argv,type,fts_options)219 copy(argv, type, fts_options)
220 char *argv[];
221 enum op type;
222 int fts_options;
223 {
224 struct stat to_stat;
225 FTS *ftsp;
226 FTSENT *curr;
227 int base, dne, nlen, rval;
228 char *p;
229
230 if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
231 err(1, NULL);
232 for (rval = 0; (curr = fts_read(ftsp)) != NULL;) {
233 switch (curr->fts_info) {
234 case FTS_NS:
235 case FTS_ERR:
236 warnx("%s: %s",
237 curr->fts_path, strerror(curr->fts_errno));
238 rval = 1;
239 continue;
240 case FTS_DC: /* Warn, continue. */
241 warnx("%s: directory causes a cycle", curr->fts_path);
242 rval = 1;
243 continue;
244 case FTS_DP: /* Ignore, continue. */
245 continue;
246 }
247
248 /*
249 * If we are in case (2) or (3) above, we need to append the
250 * source name to the target name.
251 */
252 if (type != FILE_TO_FILE) {
253 if ((curr->fts_namelen +
254 to.target_end - to.p_path + 1) > MAXPATHLEN) {
255 warnx("%s/%s: name too long (not copied)",
256 to.p_path, curr->fts_name);
257 rval = 1;
258 continue;
259 }
260
261 /*
262 * Need to remember the roots of traversals to create
263 * correct pathnames. If there's a directory being
264 * copied to a non-existent directory, e.g.
265 * cp -R a/dir noexist
266 * the resulting path name should be noexist/foo, not
267 * noexist/dir/foo (where foo is a file in dir), which
268 * is the case where the target exists.
269 *
270 * Also, check for "..". This is for correct path
271 * concatentation for paths ending in "..", e.g.
272 * cp -R .. /tmp
273 * Paths ending in ".." are changed to ".". This is
274 * tricky, but seems the easiest way to fix the problem.
275 *
276 * XXX
277 * Since the first level MUST be FTS_ROOTLEVEL, base
278 * is always initialized.
279 */
280 if (curr->fts_level == FTS_ROOTLEVEL)
281 if (type != DIR_TO_DNE) {
282 p = strrchr(curr->fts_path, '/');
283 base = (p == NULL) ? 0 :
284 (int)(p - curr->fts_path + 1);
285
286 if (!strcmp(&curr->fts_path[base],
287 ".."))
288 base += 1;
289 } else
290 base = curr->fts_pathlen;
291
292 if (to.target_end[-1] != '/') {
293 *to.target_end = '/';
294 *(to.target_end + 1) = 0;
295 }
296 p = &curr->fts_path[base];
297 nlen = curr->fts_pathlen - base;
298
299 (void)strncat(to.target_end + 1, p, nlen);
300 to.p_end = to.target_end + nlen + 1;
301 *to.p_end = 0;
302 STRIP_TRAILING_SLASH(to);
303 }
304
305 /* Not an error but need to remember it happened */
306 if (stat(to.p_path, &to_stat) == -1)
307 dne = 1;
308 else {
309 if (to_stat.st_dev == curr->fts_statp->st_dev &&
310 to_stat.st_ino == curr->fts_statp->st_ino) {
311 warnx("%s and %s are identical (not copied).",
312 to.p_path, curr->fts_path);
313 rval = 1;
314 if (S_ISDIR(curr->fts_statp->st_mode))
315 (void)fts_set(ftsp, curr, FTS_SKIP);
316 continue;
317 }
318 if (!S_ISDIR(curr->fts_statp->st_mode) &&
319 S_ISDIR(to_stat.st_mode)) {
320 warnx("cannot overwrite directory %s with non-directory %s",
321 to.p_path, curr->fts_path);
322 rval = 1;
323 continue;
324 }
325 dne = 0;
326 }
327
328 switch (curr->fts_statp->st_mode & S_IFMT) {
329 case S_IFLNK:
330 if (copy_link(curr, !dne))
331 rval = 1;
332 break;
333 case S_IFDIR:
334 if (!Rflag && !rflag) {
335 warnx("%s is a directory (not copied).",
336 curr->fts_path);
337 (void)fts_set(ftsp, curr, FTS_SKIP);
338 rval = 1;
339 break;
340 }
341 /*
342 * If the directory doesn't exist, create the new
343 * one with the from file mode plus owner RWX bits,
344 * modified by the umask. Trade-off between being
345 * able to write the directory (if from directory is
346 * 555) and not causing a permissions race. If the
347 * umask blocks owner writes, we fail..
348 */
349 if (dne) {
350 if (mkdir(to.p_path,
351 curr->fts_statp->st_mode | S_IRWXU) < 0)
352 err(1, "%s", to.p_path);
353 } else if (!S_ISDIR(to_stat.st_mode)) {
354 errno = ENOTDIR;
355 err(1, "%s", to.p_path);
356 }
357 /*
358 * If not -p and directory didn't exist, set it to be
359 * the same as the from directory, umodified by the
360 * umask; arguably wrong, but it's been that way
361 * forever.
362 */
363 if (pflag && setfile(curr->fts_statp, 0))
364 rval = 1;
365 else if (dne)
366 (void)chmod(to.p_path,
367 curr->fts_statp->st_mode);
368 break;
369 case S_IFBLK:
370 case S_IFCHR:
371 if (Rflag) {
372 if (copy_special(curr->fts_statp, !dne))
373 rval = 1;
374 } else
375 if (copy_file(curr, dne))
376 rval = 1;
377 break;
378 case S_IFIFO:
379 if (Rflag) {
380 if (copy_fifo(curr->fts_statp, !dne))
381 rval = 1;
382 } else
383 if (copy_file(curr, dne))
384 rval = 1;
385 break;
386 default:
387 if (copy_file(curr, dne))
388 rval = 1;
389 break;
390 }
391 }
392 if (errno)
393 err(1, "fts_read");
394 return (rval);
395 }
396
397 /*
398 * mastercmp --
399 * The comparison function for the copy order. The order is to copy
400 * non-directory files before directory files. The reason for this
401 * is because files tend to be in the same cylinder group as their
402 * parent directory, whereas directories tend not to be. Copying the
403 * files first reduces seeking.
404 */
405 int
mastercmp(a,b)406 mastercmp(a, b)
407 const FTSENT **a, **b;
408 {
409 int a_info, b_info;
410
411 a_info = (*a)->fts_info;
412 if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
413 return (0);
414 b_info = (*b)->fts_info;
415 if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
416 return (0);
417 if (a_info == FTS_D)
418 return (-1);
419 if (b_info == FTS_D)
420 return (1);
421 return (0);
422 }
423