xref: /freebsd/usr.bin/xinstall/xinstall.c (revision 41466b50c1d5bfd1cf6adaae547a579a75d7c04e)
1 /*
2  * Copyright (c) 1987, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1987, 1993\n\
37 	The Regents of the University of California.  All rights reserved.\n";
38 #endif /* not lint */
39 
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "From: @(#)xinstall.c	8.1 (Berkeley) 7/21/93";
43 #endif
44 static const char rcsid[] =
45   "$FreeBSD$";
46 #endif /* not lint */
47 
48 #include <sys/param.h>
49 #include <sys/wait.h>
50 #include <sys/mman.h>
51 #include <sys/stat.h>
52 #include <sys/mount.h>
53 
54 #include <ctype.h>
55 #include <err.h>
56 #include <errno.h>
57 #include <fcntl.h>
58 #include <grp.h>
59 #include <paths.h>
60 #include <pwd.h>
61 #include <stdio.h>
62 #include <stdlib.h>
63 #include <string.h>
64 #include <unistd.h>
65 #include <sysexits.h>
66 #include <utime.h>
67 
68 #include "pathnames.h"
69 
70 /* Bootstrap aid - this doesn't exist in most older releases */
71 #ifndef MAP_FAILED
72 #define MAP_FAILED ((void *)-1)	/* from <sys/mman.h> */
73 #endif
74 
75 #define	DIRECTORY	0x01		/* Tell install it's a directory. */
76 #define	SETFLAGS	0x02		/* Tell install to set flags. */
77 #define	NOCHANGEBITS	(UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
78 #define	BACKUP_SUFFIX	".old"
79 
80 struct passwd *pp;
81 struct group *gp;
82 gid_t gid;
83 uid_t uid;
84 int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
85 mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
86 char *suffix = BACKUP_SUFFIX;
87 
88 void	copy __P((int, char *, int, char *, off_t));
89 int	compare __P((int, const char *, size_t, int, const char *, size_t));
90 int	create_newfile __P((char *, int, struct stat *));
91 int	create_tempfile __P((char *, char *, size_t));
92 void	install __P((char *, char *, u_long, u_int));
93 void	install_dir __P((char *));
94 u_long	numeric_id __P((char *, char *));
95 void	strip __P((char *));
96 int	trymmap __P((int));
97 void	usage __P((void));
98 
99 int
100 main(argc, argv)
101 	int argc;
102 	char *argv[];
103 {
104 	struct stat from_sb, to_sb;
105 	mode_t *set;
106 	u_long fset;
107 	int ch, no_target;
108 	u_int iflags;
109 	char *flags, *group, *owner, *to_name;
110 
111 	iflags = 0;
112 	group = owner = NULL;
113 	while ((ch = getopt(argc, argv, "B:bCcdf:g:Mm:o:pSsv")) != -1)
114 		switch((char)ch) {
115 		case 'B':
116 			suffix = optarg;
117 			/* FALLTHROUGH */
118 		case 'b':
119 			dobackup = 1;
120 			break;
121 		case 'C':
122 			docompare = 1;
123 			break;
124 		case 'c':
125 			/* For backwards compatibility. */
126 			break;
127 		case 'd':
128 			dodir = 1;
129 			break;
130 		case 'f':
131 			flags = optarg;
132 			if (strtofflags(&flags, &fset, NULL))
133 				errx(EX_USAGE, "%s: invalid flag", flags);
134 			iflags |= SETFLAGS;
135 			break;
136 		case 'g':
137 			group = optarg;
138 			break;
139 		case 'M':
140 			nommap = 1;
141 			break;
142 		case 'm':
143 			if (!(set = setmode(optarg)))
144 				errx(EX_USAGE, "invalid file mode: %s",
145 				     optarg);
146 			mode = getmode(set, 0);
147 			free(set);
148 			break;
149 		case 'o':
150 			owner = optarg;
151 			break;
152 		case 'p':
153 			docompare = dopreserve = 1;
154 			break;
155 		case 'S':
156 			safecopy = 1;
157 			break;
158 		case 's':
159 			dostrip = 1;
160 			break;
161 		case 'v':
162 			verbose = 1;
163 			break;
164 		case '?':
165 		default:
166 			usage();
167 		}
168 	argc -= optind;
169 	argv += optind;
170 
171 	/* some options make no sense when creating directories */
172 	if ((safecopy || dostrip) && dodir)
173 		usage();
174 
175 	/*
176 	 * Older versions allowed -d -C combo.  Issue a warning
177 	 * for now, but turn this into an error before 4.5-RELEASE.
178 	 */
179 	if (docompare && dodir)
180 		warnx("the -d and -C options may not be specified together");
181 
182 	/* must have at least two arguments, except when creating directories */
183 	if (argc < 2 && !dodir)
184 		usage();
185 
186 	/* need to make a temp copy so we can compare stripped version */
187 	if (docompare && dostrip)
188 		safecopy = 1;
189 
190 	/* get group and owner id's */
191 	if (group != NULL) {
192 		if ((gp = getgrnam(group)) != NULL)
193 			gid = gp->gr_gid;
194 		else
195 			gid = (uid_t)numeric_id(group, "group");
196 	} else
197 		gid = (gid_t)-1;
198 
199 	if (owner != NULL) {
200 		if ((pp = getpwnam(owner)) != NULL)
201 			uid = pp->pw_uid;
202 		else
203 			uid = (uid_t)numeric_id(owner, "user");
204 	} else
205 		uid = (uid_t)-1;
206 
207 	if (dodir) {
208 		for (; *argv != NULL; ++argv)
209 			install_dir(*argv);
210 		exit(EX_OK);
211 		/* NOTREACHED */
212 	}
213 
214 	no_target = stat(to_name = argv[argc - 1], &to_sb);
215 	if (!no_target && S_ISDIR(to_sb.st_mode)) {
216 		for (; *argv != to_name; ++argv)
217 			install(*argv, to_name, fset, iflags | DIRECTORY);
218 		exit(EX_OK);
219 		/* NOTREACHED */
220 	}
221 
222 	/* can't do file1 file2 directory/file */
223 	if (argc != 2)
224 		usage();
225 
226 	if (!no_target) {
227 		if (stat(*argv, &from_sb))
228 			err(EX_OSERR, "%s", *argv);
229 		if (!S_ISREG(to_sb.st_mode)) {
230 			errno = EFTYPE;
231 			err(EX_OSERR, "%s", to_name);
232 		}
233 		if (to_sb.st_dev == from_sb.st_dev &&
234 		    to_sb.st_ino == from_sb.st_ino)
235 			errx(EX_USAGE,
236 			    "%s and %s are the same file", *argv, to_name);
237 	}
238 	install(*argv, to_name, fset, iflags);
239 	exit(EX_OK);
240 	/* NOTREACHED */
241 }
242 
243 u_long
244 numeric_id(name, type)
245 	char *name, *type;
246 {
247 	u_long val;
248 	char *ep;
249 
250 	/*
251 	 * XXX
252 	 * We know that uid_t's and gid_t's are unsigned longs.
253 	 */
254 	errno = 0;
255 	val = strtoul(name, &ep, 10);
256 	if (errno)
257 		err(EX_NOUSER, "%s", name);
258 	if (*ep != '\0')
259 		errx(EX_NOUSER, "unknown %s %s", type, name);
260 	return (val);
261 }
262 
263 /*
264  * install --
265  *	build a path name and install the file
266  */
267 void
268 install(from_name, to_name, fset, flags)
269 	char *from_name, *to_name;
270 	u_long fset;
271 	u_int flags;
272 {
273 	struct stat from_sb, temp_sb, to_sb;
274 	struct utimbuf utb;
275 	int devnull, files_match, from_fd, serrno, target;
276 	int tempcopy, temp_fd, to_fd;
277 	char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
278 
279 	files_match = 0;
280 
281 	/* If try to install NULL file to a directory, fails. */
282 	if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
283 		if (stat(from_name, &from_sb))
284 			err(EX_OSERR, "%s", from_name);
285 		if (!S_ISREG(from_sb.st_mode)) {
286 			errno = EFTYPE;
287 			err(EX_OSERR, "%s", from_name);
288 		}
289 		/* Build the target path. */
290 		if (flags & DIRECTORY) {
291 			(void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
292 			    to_name,
293 			    (p = strrchr(from_name, '/')) ? ++p : from_name);
294 			to_name = pathbuf;
295 		}
296 		devnull = 0;
297 	} else {
298 		devnull = 1;
299 	}
300 
301 	target = stat(to_name, &to_sb) == 0;
302 
303 	/* Only install to regular files. */
304 	if (target && !S_ISREG(to_sb.st_mode)) {
305 		errno = EFTYPE;
306 		warn("%s", to_name);
307 		return;
308 	}
309 
310 	/* Only copy safe if the target exists. */
311 	tempcopy = safecopy && target;
312 
313 	if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
314 		err(EX_OSERR, "%s", from_name);
315 
316 	/* If we don't strip, we can compare first. */
317 	if (docompare && !dostrip && target) {
318 		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
319 			err(EX_OSERR, "%s", to_name);
320 		if (devnull)
321 			files_match = to_sb.st_size == 0;
322 		else
323 			files_match = !(compare(from_fd, from_name,
324 			    (size_t)from_sb.st_size, to_fd,
325 			    to_name, (size_t)to_sb.st_size));
326 
327 		/* Close "to" file unless we match. */
328 		if (!files_match)
329 			(void)close(to_fd);
330 	}
331 
332 	if (!files_match) {
333 		if (tempcopy) {
334 			to_fd = create_tempfile(to_name, tempfile,
335 			    sizeof(tempfile));
336 			if (to_fd < 0)
337 				err(EX_OSERR, "%s", tempfile);
338 		} else {
339 			if ((to_fd = create_newfile(to_name, target,
340 			    &to_sb)) < 0)
341 				err(EX_OSERR, "%s", to_name);
342 			if (verbose)
343 				(void)printf("install: %s -> %s\n",
344 				    from_name, to_name);
345 		}
346 		if (!devnull)
347 			copy(from_fd, from_name, to_fd,
348 			     tempcopy ? tempfile : to_name, from_sb.st_size);
349 	}
350 
351 	if (dostrip) {
352 		strip(tempcopy ? tempfile : to_name);
353 
354 		/*
355 		 * Re-open our fd on the target, in case we used a strip
356 		 * that does not work in-place -- like GNU binutils strip.
357 		 */
358 		close(to_fd);
359 		to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
360 		if (to_fd < 0)
361 			err(EX_OSERR, "stripping %s", to_name);
362 	}
363 
364 	/*
365 	 * Compare the stripped temp file with the target.
366 	 */
367 	if (docompare && dostrip && target) {
368 		temp_fd = to_fd;
369 
370 		/* Re-open to_fd using the real target name. */
371 		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
372 			err(EX_OSERR, "%s", to_name);
373 
374 		if (fstat(temp_fd, &temp_sb)) {
375 			serrno = errno;
376 			(void)unlink(tempfile);
377 			errno = serrno;
378 			err(EX_OSERR, "%s", tempfile);
379 		}
380 
381 		if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
382 			    to_name, (size_t)to_sb.st_size) == 0) {
383 			/*
384 			 * If target has more than one link we need to
385 			 * replace it in order to snap the extra links.
386 			 * Need to preserve target file times, though.
387 			 */
388 			if (to_sb.st_nlink != 1) {
389 				utb.actime = to_sb.st_atime;
390 				utb.modtime = to_sb.st_mtime;
391 				(void)utime(tempfile, &utb);
392 			} else {
393 				files_match = 1;
394 				(void)unlink(tempfile);
395 			}
396 			(void) close(temp_fd);
397 		}
398 	}
399 
400 	/*
401 	 * Move the new file into place if doing a safe copy
402 	 * and the files are different (or just not compared).
403 	 */
404 	if (tempcopy && !files_match) {
405 		/* Try to turn off the immutable bits. */
406 		if (to_sb.st_flags & NOCHANGEBITS)
407 			(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
408 		if (dobackup) {
409 			if (snprintf(backup, MAXPATHLEN, "%s%s", to_name,
410 			    suffix) != strlen(to_name) + strlen(suffix)) {
411 				unlink(tempfile);
412 				errx(EX_OSERR, "%s: backup filename too long",
413 				    to_name);
414 			}
415 			if (verbose)
416 				(void)printf("install: %s -> %s\n", to_name, backup);
417 			if (rename(to_name, backup) < 0) {
418 				serrno = errno;
419 				unlink(tempfile);
420 				errno = serrno;
421 				err(EX_OSERR, "rename: %s to %s", to_name,
422 				     backup);
423 			}
424 		}
425 		if (verbose)
426 			(void)printf("install: %s -> %s\n", from_name, to_name);
427 		if (rename(tempfile, to_name) < 0) {
428 			serrno = errno;
429 			unlink(tempfile);
430 			errno = serrno;
431 			err(EX_OSERR, "rename: %s to %s",
432 			    tempfile, to_name);
433 		}
434 
435 		/* Re-open to_fd so we aren't hosed by the rename(2). */
436 		(void) close(to_fd);
437 		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
438 			err(EX_OSERR, "%s", to_name);
439 	}
440 
441 	/*
442 	 * Preserve the timestamp of the source file if necessary.
443 	 */
444 	if (dopreserve && !files_match && !devnull) {
445 		utb.actime = from_sb.st_atime;
446 		utb.modtime = from_sb.st_mtime;
447 		(void)utime(to_name, &utb);
448 	}
449 
450 	if (fstat(to_fd, &to_sb) == -1) {
451 		serrno = errno;
452 		(void)unlink(to_name);
453 		errno = serrno;
454 		err(EX_OSERR, "%s", to_name);
455 	}
456 
457 	/*
458 	 * Set owner, group, mode for target; do the chown first,
459 	 * chown may lose the setuid bits.
460 	 */
461 	if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
462 	    (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
463 	    (mode != to_sb.st_mode)) {
464 		/* Try to turn off the immutable bits. */
465 		if (to_sb.st_flags & NOCHANGEBITS)
466 			(void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
467 	}
468 
469 	if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
470 	    (uid != (uid_t)-1 && uid != to_sb.st_uid))
471 		if (fchown(to_fd, uid, gid) == -1) {
472 			serrno = errno;
473 			(void)unlink(to_name);
474 			errno = serrno;
475 			err(EX_OSERR,"%s: chown/chgrp", to_name);
476 		}
477 
478 	if (mode != to_sb.st_mode)
479 		if (fchmod(to_fd, mode)) {
480 			serrno = errno;
481 			(void)unlink(to_name);
482 			errno = serrno;
483 			err(EX_OSERR, "%s: chmod", to_name);
484 		}
485 
486 	/*
487 	 * If provided a set of flags, set them, otherwise, preserve the
488 	 * flags, except for the dump flag.
489 	 * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
490 	 * trying to turn off UF_NODUMP.  If we're trying to set real flags,
491 	 * then warn if the the fs doesn't support it, otherwise fail.
492 	 */
493 	if (!devnull && fchflags(to_fd,
494 	    flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
495 		if (flags & SETFLAGS) {
496 			if (errno == EOPNOTSUPP)
497 				warn("%s: chflags", to_name);
498 			else {
499 				serrno = errno;
500 				(void)unlink(to_name);
501 				errno = serrno;
502 				err(EX_OSERR, "%s: chflags", to_name);
503 			}
504 		}
505 	}
506 
507 	(void)close(to_fd);
508 	if (!devnull)
509 		(void)close(from_fd);
510 }
511 
512 /*
513  * compare --
514  *	compare two files; non-zero means files differ
515  */
516 int
517 compare(int from_fd, const char *from_name, size_t from_len,
518 	int to_fd, const char *to_name, size_t to_len)
519 {
520 	char *p, *q;
521 	int rv;
522 	int done_compare;
523 
524 	rv = 0;
525 	if (from_len != to_len)
526 		return 1;
527 
528 	if (from_len <= 8 * 1024 * 1024) {
529 		done_compare = 0;
530 		if (trymmap(from_fd) && trymmap(to_fd)) {
531 			p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
532 			if (p == (char *)MAP_FAILED)
533 				goto out;
534 			q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
535 			if (q == (char *)MAP_FAILED) {
536 				munmap(p, from_len);
537 				goto out;
538 			}
539 
540 			rv = memcmp(p, q, from_len);
541 			munmap(p, from_len);
542 			munmap(q, from_len);
543 			done_compare = 1;
544 		}
545 	out:
546 		if (!done_compare) {
547 			char buf1[MAXBSIZE];
548 			char buf2[MAXBSIZE];
549 			int n1, n2;
550 
551 			rv = 0;
552 			lseek(from_fd, 0, SEEK_SET);
553 			lseek(to_fd, 0, SEEK_SET);
554 			while (rv == 0) {
555 				n1 = read(from_fd, buf1, sizeof(buf1));
556 				if (n1 == 0)
557 					break;		/* EOF */
558 				else if (n1 > 0) {
559 					n2 = read(to_fd, buf2, n1);
560 					if (n2 == n1)
561 						rv = memcmp(buf1, buf2, n1);
562 					else
563 						rv = 1;	/* out of sync */
564 				} else
565 					rv = 1;		/* read failure */
566 			}
567 			lseek(from_fd, 0, SEEK_SET);
568 			lseek(to_fd, 0, SEEK_SET);
569 		}
570 	} else
571 		rv = 1;	/* don't bother in this case */
572 
573 	return rv;
574 }
575 
576 /*
577  * create_tempfile --
578  *	create a temporary file based on path and open it
579  */
580 int
581 create_tempfile(path, temp, tsize)
582 	char *path;
583 	char *temp;
584 	size_t tsize;
585 {
586 	char *p;
587 
588 	(void)strncpy(temp, path, tsize);
589 	temp[tsize - 1] = '\0';
590 	if ((p = strrchr(temp, '/')) != NULL)
591 		p++;
592 	else
593 		p = temp;
594 	(void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
595 	temp[tsize - 1] = '\0';
596 	return (mkstemp(temp));
597 }
598 
599 /*
600  * create_newfile --
601  *	create a new file, overwriting an existing one if necessary
602  */
603 int
604 create_newfile(path, target, sbp)
605 	char *path;
606 	int target;
607 	struct stat *sbp;
608 {
609 	char backup[MAXPATHLEN];
610 
611 	if (target) {
612 		/*
613 		 * Unlink now... avoid ETXTBSY errors later.  Try to turn
614 		 * off the append/immutable bits -- if we fail, go ahead,
615 		 * it might work.
616 		 */
617 		if (sbp->st_flags & NOCHANGEBITS)
618 			(void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
619 
620 		if (dobackup) {
621 			if (snprintf(backup, MAXPATHLEN, "%s%s",
622 			    path, suffix) != strlen(path) + strlen(suffix))
623 				errx(EX_OSERR, "%s: backup filename too long",
624 				    path);
625 			(void)snprintf(backup, MAXPATHLEN, "%s%s",
626 			    path, suffix);
627 			if (verbose)
628 				(void)printf("install: %s -> %s\n",
629 				    path, backup);
630 			if (rename(path, backup) < 0)
631 				err(EX_OSERR, "rename: %s to %s", path, backup);
632 		} else
633 			(void)unlink(path);
634 	}
635 
636 	return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
637 }
638 
639 /*
640  * copy --
641  *	copy from one file to another
642  */
643 void
644 copy(from_fd, from_name, to_fd, to_name, size)
645 	register int from_fd, to_fd;
646 	char *from_name, *to_name;
647 	off_t size;
648 {
649 	register int nr, nw;
650 	int serrno;
651 	char *p, buf[MAXBSIZE];
652 	int done_copy;
653 
654 	/* Rewind file descriptors. */
655 	if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
656 		err(EX_OSERR, "lseek: %s", from_name);
657 	if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
658 		err(EX_OSERR, "lseek: %s", to_name);
659 
660 	/*
661 	 * Mmap and write if less than 8M (the limit is so we don't totally
662 	 * trash memory on big files.  This is really a minor hack, but it
663 	 * wins some CPU back.
664 	 */
665 	done_copy = 0;
666 	if (size <= 8 * 1048576 && trymmap(from_fd) &&
667 	    (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
668 		    from_fd, (off_t)0)) != (char *)MAP_FAILED) {
669 		if ((nw = write(to_fd, p, size)) != size) {
670 			serrno = errno;
671 			(void)unlink(to_name);
672 			errno = nw > 0 ? EIO : serrno;
673 			err(EX_OSERR, "%s", to_name);
674 		}
675 		done_copy = 1;
676 	}
677 	if (!done_copy) {
678 		while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
679 			if ((nw = write(to_fd, buf, nr)) != nr) {
680 				serrno = errno;
681 				(void)unlink(to_name);
682 				errno = nw > 0 ? EIO : serrno;
683 				err(EX_OSERR, "%s", to_name);
684 			}
685 		if (nr != 0) {
686 			serrno = errno;
687 			(void)unlink(to_name);
688 			errno = serrno;
689 			err(EX_OSERR, "%s", from_name);
690 		}
691 	}
692 }
693 
694 /*
695  * strip --
696  *	use strip(1) to strip the target file
697  */
698 void
699 strip(to_name)
700 	char *to_name;
701 {
702 	int serrno, status;
703 
704 	switch (fork()) {
705 	case -1:
706 		serrno = errno;
707 		(void)unlink(to_name);
708 		errno = serrno;
709 		err(EX_TEMPFAIL, "fork");
710 	case 0:
711 		execlp("strip", "strip", to_name, (char *)NULL);
712 		err(EX_OSERR, "exec(strip)");
713 	default:
714 		if (wait(&status) == -1 || status) {
715 			(void)unlink(to_name);
716 			exit(EX_SOFTWARE);
717 			/* NOTREACHED */
718 		}
719 	}
720 }
721 
722 /*
723  * install_dir --
724  *	build directory heirarchy
725  */
726 void
727 install_dir(path)
728 	char *path;
729 {
730 	register char *p;
731 	struct stat sb;
732 	int ch;
733 
734 	for (p = path;; ++p)
735 		if (!*p || (p != path && *p  == '/')) {
736 			ch = *p;
737 			*p = '\0';
738 			if (stat(path, &sb)) {
739 				if (errno != ENOENT || mkdir(path, 0755) < 0) {
740 					err(EX_OSERR, "mkdir %s", path);
741 					/* NOTREACHED */
742 				} else if (verbose)
743 					(void)printf("install: mkdir %s\n",
744 						     path);
745 			} else if (!S_ISDIR(sb.st_mode))
746 				errx(EX_OSERR, "%s exists but is not a directory", path);
747 			if (!(*p = ch))
748 				break;
749  		}
750 
751 	if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
752 		warn("chown %u:%u %s", uid, gid, path);
753 	if (chmod(path, mode))
754 		warn("chmod %o %s", mode, path);
755 }
756 
757 /*
758  * usage --
759  *	print a usage message and die
760  */
761 void
762 usage()
763 {
764 	(void)fprintf(stderr, "\
765 usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
766                [-o owner] file1 file2\n\
767        install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
768                [-o owner] file1 ... fileN directory\n\
769        install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
770 	exit(EX_USAGE);
771 	/* NOTREACHED */
772 }
773 
774 /*
775  * trymmap --
776  *	return true (1) if mmap should be tried, false (0) if not.
777  */
778 int
779 trymmap(fd)
780 	int fd;
781 {
782 /*
783  * The ifdef is for bootstrapping - f_fstypename doesn't exist in
784  * pre-Lite2-merge systems.
785  */
786 #ifdef MFSNAMELEN
787 	struct statfs stfs;
788 
789 	if (nommap || fstatfs(fd, &stfs) != 0)
790 		return (0);
791 	if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
792 	    strcmp(stfs.f_fstypename, "cd9660") == 0)
793 		return (1);
794 #endif
795 	return (0);
796 }
797