cp.c revision 14416 
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 * 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.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	$Id: cp.c,v 1.9 1996/02/19 05:56:33 pst Exp $
37 */
38
39#ifndef lint
40static char copyright[] =
41"@(#) Copyright (c) 1988, 1993, 1994\n\
42	The Regents of the University of California.  All rights reserved.\n";
43#endif /* not lint */
44
45#ifndef lint
46static char sccsid[] = "@(#)cp.c	8.2 (Berkeley) 4/1/94";
47#endif /* not lint */
48
49/*
50 * Cp copies source files to target files.
51 *
52 * The global PATH_T structure "to" always contains the path to the
53 * current target file.  Since fts(3) does not change directories,
54 * this path can be either absolute or dot-realative.
55 *
56 * The basic algorithm is to initialize "to" and use fts(3) to traverse
57 * the file hierarchy rooted in the argument list.  A trivial case is the
58 * case of 'cp file1 file2'.  The more interesting case is the case of
59 * 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
60 * path (relative to the root of the traversal) is appended to dir (stored
61 * in "to") to form the final target path.
62 */
63
64#include <sys/param.h>
65#include <sys/stat.h>
66#include <sys/mman.h>
67#include <sys/time.h>
68
69#include <dirent.h>
70#include <err.h>
71#include <errno.h>
72#include <fcntl.h>
73#include <fts.h>
74#include <stdio.h>
75#include <stdlib.h>
76#include <string.h>
77#include <unistd.h>
78
79#include "extern.h"
80
81#define	STRIP_TRAILING_SLASH(p) {					\
82        while ((p).p_end > (p).p_path + 1 && (p).p_end[-1] == '/')	\
83                *--(p).p_end = 0;					\
84}
85
86PATH_T to = { to.p_path, "" };
87
88uid_t myuid;
89int Rflag, iflag, pflag, rflag, fflag;
90int myumask;
91
92enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
93
94int copy __P((char *[], enum op, int));
95int mastercmp __P((const FTSENT **, const FTSENT **));
96
97int
98main(argc, argv)
99	int argc;
100	char *argv[];
101{
102	struct stat to_stat, tmp_stat;
103	enum op type;
104	int Hflag, Lflag, Pflag, ch, fts_options, r;
105	char *target;
106
107	Hflag = Lflag = Pflag = 0;
108	while ((ch = getopt(argc, argv, "HLPRfipr")) != EOF)
109		switch (ch) {
110		case 'H':
111			Hflag = 1;
112			Lflag = Pflag = 0;
113			break;
114		case 'L':
115			Lflag = 1;
116			Hflag = Pflag = 0;
117			break;
118		case 'P':
119			Pflag = 1;
120			Hflag = Lflag = 0;
121			break;
122		case 'R':
123			Rflag = 1;
124			break;
125		case 'f':
126			fflag = 1;
127			iflag = 0;
128			break;
129		case 'i':
130			iflag = 1;
131			fflag = 0;
132			break;
133		case 'p':
134			pflag = 1;
135			break;
136		case 'r':
137			rflag = 1;
138			break;
139		default:
140			usage();
141			break;
142		}
143	argc -= optind;
144	argv += optind;
145
146	if (argc < 2)
147		usage();
148
149	fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
150	if (rflag) {
151		if (Rflag)
152			errx(1,
153		    "the -R and -r options may not be specified together.");
154		if (Hflag || Lflag || Pflag)
155			errx(1,
156	"the -H, -L, and -P options may not be specified with the -r option.");
157		fts_options &= ~FTS_PHYSICAL;
158		fts_options |= FTS_LOGICAL;
159	}
160	if (Rflag) {
161		if (Hflag)
162			fts_options |= FTS_COMFOLLOW;
163		if (Lflag) {
164			fts_options &= ~FTS_PHYSICAL;
165			fts_options |= FTS_LOGICAL;
166		}
167	} else {
168		fts_options &= ~FTS_PHYSICAL;
169		fts_options |= FTS_LOGICAL;
170	}
171
172	myuid = getuid();
173
174	/* Copy the umask for explicit mode setting. */
175	myumask = umask(0);
176	(void)umask(myumask);
177
178	/* Save the target base in "to". */
179	target = argv[--argc];
180	if (strlen(target) > MAXPATHLEN)
181		errx(1, "%s: name too long", target);
182	(void)strcpy(to.p_path, target);
183	to.p_end = to.p_path + strlen(to.p_path);
184        if (to.p_path == to.p_end) {
185		*to.p_end++ = '.';
186		*to.p_end = 0;
187	}
188        STRIP_TRAILING_SLASH(to);
189	to.target_end = to.p_end;
190
191	/* Set end of argument list for fts(3). */
192	argv[argc] = NULL;
193
194	/*
195	 * Cp has two distinct cases:
196	 *
197	 * cp [-R] source target
198	 * cp [-R] source1 ... sourceN directory
199	 *
200	 * In both cases, source can be either a file or a directory.
201	 *
202	 * In (1), the target becomes a copy of the source. That is, if the
203	 * source is a file, the target will be a file, and likewise for
204	 * directories.
205	 *
206	 * In (2), the real target is not directory, but "directory/source".
207	 */
208	r = stat(to.p_path, &to_stat);
209	if (r == -1 && errno != ENOENT)
210		err(1, "%s", to.p_path);
211	if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
212		/*
213		 * Case (1).  Target is not a directory.
214		 */
215		if (argc > 1) {
216			usage();
217			exit(1);
218		}
219		/*
220		 * Need to detect the case:
221		 *	cp -R dir foo
222		 * Where dir is a directory and foo does not exist, where
223		 * we want pathname concatenations turned on but not for
224		 * the initial mkdir().
225		 */
226		if (r == -1) {
227			if (rflag || (Rflag && (Lflag || Hflag)))
228				stat(*argv, &tmp_stat);
229			else
230				lstat(*argv, &tmp_stat);
231
232			if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
233				type = DIR_TO_DNE;
234			else
235				type = FILE_TO_FILE;
236		} else
237			type = FILE_TO_FILE;
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
247int
248copy(argv, type, fts_options)
249	char *argv[];
250	enum op type;
251	int fts_options;
252{
253	struct stat to_stat;
254	FTS *ftsp;
255	FTSENT *curr;
256	int base, dne, nlen, rval;
257	char *p, *target_mid;
258
259	if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
260		err(1, NULL);
261	for (rval = 0; (curr = fts_read(ftsp)) != NULL;) {
262		switch (curr->fts_info) {
263		case FTS_NS:
264		case FTS_ERR:
265			warnx("%s: %s",
266			    curr->fts_path, strerror(curr->fts_errno));
267			rval = 1;
268			continue;
269		case FTS_DC:			/* Warn, continue. */
270			warnx("%s: directory causes a cycle", curr->fts_path);
271			rval = 1;
272			continue;
273		case FTS_DP:			/* Ignore, continue. */
274			continue;
275		}
276
277		/*
278		 * If we are in case (2) or (3) above, we need to append the
279                 * source name to the target name.
280                 */
281		if (type != FILE_TO_FILE) {
282			/*
283			 * Need to remember the roots of traversals to create
284			 * correct pathnames.  If there's a directory being
285			 * copied to a non-existent directory, e.g.
286			 *	cp -R a/dir noexist
287			 * the resulting path name should be noexist/foo, not
288			 * noexist/dir/foo (where foo is a file in dir), which
289			 * is the case where the target exists.
290			 *
291			 * Also, check for "..".  This is for correct path
292			 * concatentation for paths ending in "..", e.g.
293			 *	cp -R .. /tmp
294			 * Paths ending in ".." are changed to ".".  This is
295			 * tricky, but seems the easiest way to fix the problem.
296			 *
297			 * XXX
298			 * Since the first level MUST be FTS_ROOTLEVEL, base
299			 * is always initialized.
300			 */
301			if (curr->fts_level == FTS_ROOTLEVEL)
302				if (type != DIR_TO_DNE) {
303					p = strrchr(curr->fts_path, '/');
304					base = (p == NULL) ? 0 :
305					    (int)(p - curr->fts_path + 1);
306
307					if (!strcmp(&curr->fts_path[base],
308					    ".."))
309						base += 1;
310				} else
311					base = curr->fts_pathlen;
312
313			p = &curr->fts_path[base];
314			nlen = curr->fts_pathlen - base;
315			target_mid = to.target_end;
316			if (*p != '/' && target_mid[-1] != '/')
317				*target_mid++ = '/';
318			*target_mid = 0;
319			if (target_mid - to.p_path + nlen > MAXPATHLEN) {
320				warnx("%s%s: name too long (not copied)",
321				    to.p_path, p);
322				rval = 1;
323				continue;
324			}
325			(void)strncat(target_mid, p, nlen);
326			to.p_end = target_mid + nlen;
327			*to.p_end = 0;
328			STRIP_TRAILING_SLASH(to);
329		}
330
331		/* Not an error but need to remember it happened */
332		if (stat(to.p_path, &to_stat) == -1)
333			dne = 1;
334		else {
335			if (to_stat.st_dev == curr->fts_statp->st_dev &&
336			    to_stat.st_ino == curr->fts_statp->st_ino) {
337				warnx("%s and %s are identical (not copied).",
338				    to.p_path, curr->fts_path);
339				rval = 1;
340				if (S_ISDIR(curr->fts_statp->st_mode))
341					(void)fts_set(ftsp, curr, FTS_SKIP);
342				continue;
343			}
344			dne = 0;
345		}
346
347		switch (curr->fts_statp->st_mode & S_IFMT) {
348		case S_IFLNK:
349			if (copy_link(curr, !dne))
350				rval = 1;
351			break;
352		case S_IFDIR:
353			if (!Rflag && !rflag) {
354				warnx("%s is a directory (not copied).",
355				    curr->fts_path);
356				(void)fts_set(ftsp, curr, FTS_SKIP);
357				rval = 1;
358				break;
359			}
360			/*
361			 * If the directory doesn't exist, create the new
362			 * one with the from file mode plus owner RWX bits,
363			 * modified by the umask.  Trade-off between being
364			 * able to write the directory (if from directory is
365			 * 555) and not causing a permissions race.  If the
366			 * umask blocks owner writes, we fail..
367			 */
368			if (dne) {
369				if (mkdir(to.p_path,
370				    curr->fts_statp->st_mode | S_IRWXU) < 0)
371					err(1, "%s", to.p_path);
372			} else if (!S_ISDIR(to_stat.st_mode)) {
373				errno = ENOTDIR;
374				err(1, "%s", to.p_path);
375			}
376			/*
377			 * If not -p and directory didn't exist, set it to be
378			 * the same as the from directory, umodified by the
379                         * umask; arguably wrong, but it's been that way
380                         * forever.
381			 */
382			if (pflag && setfile(curr->fts_statp, 0))
383				rval = 1;
384			else if (dne)
385				(void)chmod(to.p_path,
386				    curr->fts_statp->st_mode);
387			break;
388		case S_IFBLK:
389		case S_IFCHR:
390			if (Rflag) {
391				if (copy_special(curr->fts_statp, !dne))
392					rval = 1;
393			} else {
394				if (copy_file(curr, dne))
395					rval = 1;
396			}
397			break;
398		case S_IFIFO:
399			if (Rflag) {
400				if (copy_fifo(curr->fts_statp, !dne))
401					rval = 1;
402			} else {
403				if (copy_file(curr, dne))
404					rval = 1;
405			}
406			break;
407		default:
408			if (copy_file(curr, dne))
409				rval = 1;
410			break;
411		}
412	}
413	if (errno)
414		err(1, "fts_read");
415	return (rval);
416}
417
418/*
419 * mastercmp --
420 *	The comparison function for the copy order.  The order is to copy
421 *	non-directory files before directory files.  The reason for this
422 *	is because files tend to be in the same cylinder group as their
423 *	parent directory, whereas directories tend not to be.  Copying the
424 *	files first reduces seeking.
425 */
426int
427mastercmp(a, b)
428	const FTSENT **a, **b;
429{
430	int a_info, b_info;
431
432	a_info = (*a)->fts_info;
433	if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
434		return (0);
435	b_info = (*b)->fts_info;
436	if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
437		return (0);
438	if (a_info == FTS_D)
439		return (-1);
440	if (b_info == FTS_D)
441		return (1);
442	return (0);
443}
444