xinstall.c revision 100870 
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
35static 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#if 0
41#ifndef lint
42static char sccsid[] = "@(#)xinstall.c	8.1 (Berkeley) 7/21/93";
43#endif /* not lint */
44#endif
45
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: head/usr.bin/xinstall/xinstall.c 100870 2002-07-29 08:51:04Z ru $");
48
49#include <sys/param.h>
50#include <sys/mman.h>
51#include <sys/mount.h>
52#include <sys/stat.h>
53#include <sys/wait.h>
54
55#include <ctype.h>
56#include <err.h>
57#include <errno.h>
58#include <fcntl.h>
59#include <grp.h>
60#include <paths.h>
61#include <pwd.h>
62#include <stdio.h>
63#include <stdlib.h>
64#include <string.h>
65#include <sysexits.h>
66#include <unistd.h>
67#include <utime.h>
68
69#include "pathnames.h"
70
71/* Bootstrap aid - this doesn't exist in most older releases */
72#ifndef MAP_FAILED
73#define MAP_FAILED ((void *)-1)	/* from <sys/mman.h> */
74#endif
75
76#define MAX_CMP_SIZE	(16 * 1024 * 1024)
77
78#define	DIRECTORY	0x01		/* Tell install it's a directory. */
79#define	SETFLAGS	0x02		/* Tell install to set flags. */
80#define	NOCHANGEBITS	(UF_IMMUTABLE | UF_APPEND | SF_IMMUTABLE | SF_APPEND)
81#define	BACKUP_SUFFIX	".old"
82
83struct passwd *pp;
84struct group *gp;
85gid_t gid;
86uid_t uid;
87int dobackup, docompare, dodir, dopreserve, dostrip, nommap, safecopy, verbose;
88mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
89const char *suffix = BACKUP_SUFFIX;
90
91void	copy(int, const char *, int, const char *, off_t);
92int	compare(int, const char *, size_t, int, const char *, size_t);
93int	create_newfile(const char *, int, struct stat *);
94int	create_tempfile(const char *, char *, size_t);
95void	install(const char *, const char *, u_long, u_int);
96void	install_dir(char *);
97u_long	numeric_id(const char *, const char *);
98void	strip(const char *);
99int	trymmap(int);
100void	usage(void);
101
102int
103main(argc, argv)
104	int argc;
105	char *argv[];
106{
107	struct stat from_sb, to_sb;
108	mode_t *set;
109	u_long fset;
110	int ch, no_target;
111	u_int iflags;
112	char *flags;
113	const char *group, *owner, *to_name;
114
115	iflags = 0;
116	group = owner = NULL;
117	while ((ch = getopt(argc, argv, "B:bCcdf:g:Mm:o:pSsv")) != -1)
118		switch((char)ch) {
119		case 'B':
120			suffix = optarg;
121			/* FALLTHROUGH */
122		case 'b':
123			dobackup = 1;
124			break;
125		case 'C':
126			docompare = 1;
127			break;
128		case 'c':
129			/* For backwards compatibility. */
130			break;
131		case 'd':
132			dodir = 1;
133			break;
134		case 'f':
135			flags = optarg;
136			if (strtofflags(&flags, &fset, NULL))
137				errx(EX_USAGE, "%s: invalid flag", flags);
138			iflags |= SETFLAGS;
139			break;
140		case 'g':
141			group = optarg;
142			break;
143		case 'M':
144			nommap = 1;
145			break;
146		case 'm':
147			if (!(set = setmode(optarg)))
148				errx(EX_USAGE, "invalid file mode: %s",
149				     optarg);
150			mode = getmode(set, 0);
151			free(set);
152			break;
153		case 'o':
154			owner = optarg;
155			break;
156		case 'p':
157			docompare = dopreserve = 1;
158			break;
159		case 'S':
160			safecopy = 1;
161			break;
162		case 's':
163			dostrip = 1;
164			break;
165		case 'v':
166			verbose = 1;
167			break;
168		case '?':
169		default:
170			usage();
171		}
172	argc -= optind;
173	argv += optind;
174
175	/* some options make no sense when creating directories */
176	if (dostrip && dodir)
177		usage();
178
179	/* must have at least two arguments, except when creating directories */
180	if (argc < 2 && !dodir)
181		usage();
182
183	/* need to make a temp copy so we can compare stripped version */
184	if (docompare && dostrip)
185		safecopy = 1;
186
187	/* get group and owner id's */
188	if (group != NULL) {
189		if ((gp = getgrnam(group)) != NULL)
190			gid = gp->gr_gid;
191		else
192			gid = (gid_t)numeric_id(group, "group");
193	} else
194		gid = (gid_t)-1;
195
196	if (owner != NULL) {
197		if ((pp = getpwnam(owner)) != NULL)
198			uid = pp->pw_uid;
199		else
200			uid = (uid_t)numeric_id(owner, "user");
201	} else
202		uid = (uid_t)-1;
203
204	if (dodir) {
205		for (; *argv != NULL; ++argv)
206			install_dir(*argv);
207		exit(EX_OK);
208		/* NOTREACHED */
209	}
210
211	no_target = stat(to_name = argv[argc - 1], &to_sb);
212	if (!no_target && S_ISDIR(to_sb.st_mode)) {
213		for (; *argv != to_name; ++argv)
214			install(*argv, to_name, fset, iflags | DIRECTORY);
215		exit(EX_OK);
216		/* NOTREACHED */
217	}
218
219	/* can't do file1 file2 directory/file */
220	if (argc != 2)
221		usage();
222
223	if (!no_target) {
224		if (stat(*argv, &from_sb))
225			err(EX_OSERR, "%s", *argv);
226		if (!S_ISREG(to_sb.st_mode)) {
227			errno = EFTYPE;
228			err(EX_OSERR, "%s", to_name);
229		}
230		if (to_sb.st_dev == from_sb.st_dev &&
231		    to_sb.st_ino == from_sb.st_ino)
232			errx(EX_USAGE,
233			    "%s and %s are the same file", *argv, to_name);
234	}
235	install(*argv, to_name, fset, iflags);
236	exit(EX_OK);
237	/* NOTREACHED */
238}
239
240u_long
241numeric_id(name, type)
242	const char *name, *type;
243{
244	u_long val;
245	char *ep;
246
247	/*
248	 * XXX
249	 * We know that uid_t's and gid_t's are unsigned longs.
250	 */
251	errno = 0;
252	val = strtoul(name, &ep, 10);
253	if (errno)
254		err(EX_NOUSER, "%s", name);
255	if (*ep != '\0')
256		errx(EX_NOUSER, "unknown %s %s", type, name);
257	return (val);
258}
259
260/*
261 * install --
262 *	build a path name and install the file
263 */
264void
265install(from_name, to_name, fset, flags)
266	const char *from_name, *to_name;
267	u_long fset;
268	u_int flags;
269{
270	struct stat from_sb, temp_sb, to_sb;
271	struct utimbuf utb;
272	int devnull, files_match, from_fd, serrno, target;
273	int tempcopy, temp_fd, to_fd;
274	char backup[MAXPATHLEN], *p, pathbuf[MAXPATHLEN], tempfile[MAXPATHLEN];
275
276	files_match = 0;
277
278	/* If try to install NULL file to a directory, fails. */
279	if (flags & DIRECTORY || strcmp(from_name, _PATH_DEVNULL)) {
280		if (stat(from_name, &from_sb))
281			err(EX_OSERR, "%s", from_name);
282		if (!S_ISREG(from_sb.st_mode)) {
283			errno = EFTYPE;
284			err(EX_OSERR, "%s", from_name);
285		}
286		/* Build the target path. */
287		if (flags & DIRECTORY) {
288			(void)snprintf(pathbuf, sizeof(pathbuf), "%s/%s",
289			    to_name,
290			    (p = strrchr(from_name, '/')) ? ++p : from_name);
291			to_name = pathbuf;
292		}
293		devnull = 0;
294	} else {
295		devnull = 1;
296	}
297
298	target = stat(to_name, &to_sb) == 0;
299
300	/* Only install to regular files. */
301	if (target && !S_ISREG(to_sb.st_mode)) {
302		errno = EFTYPE;
303		warn("%s", to_name);
304		return;
305	}
306
307	/* Only copy safe if the target exists. */
308	tempcopy = safecopy && target;
309
310	if (!devnull && (from_fd = open(from_name, O_RDONLY, 0)) < 0)
311		err(EX_OSERR, "%s", from_name);
312
313	/* If we don't strip, we can compare first. */
314	if (docompare && !dostrip && target) {
315		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
316			err(EX_OSERR, "%s", to_name);
317		if (devnull)
318			files_match = to_sb.st_size == 0;
319		else
320			files_match = !(compare(from_fd, from_name,
321			    (size_t)from_sb.st_size, to_fd,
322			    to_name, (size_t)to_sb.st_size));
323
324		/* Close "to" file unless we match. */
325		if (!files_match)
326			(void)close(to_fd);
327	}
328
329	if (!files_match) {
330		if (tempcopy) {
331			to_fd = create_tempfile(to_name, tempfile,
332			    sizeof(tempfile));
333			if (to_fd < 0)
334				err(EX_OSERR, "%s", tempfile);
335		} else {
336			if ((to_fd = create_newfile(to_name, target,
337			    &to_sb)) < 0)
338				err(EX_OSERR, "%s", to_name);
339			if (verbose)
340				(void)printf("install: %s -> %s\n",
341				    from_name, to_name);
342		}
343		if (!devnull)
344			copy(from_fd, from_name, to_fd,
345			     tempcopy ? tempfile : to_name, from_sb.st_size);
346	}
347
348	if (dostrip) {
349		strip(tempcopy ? tempfile : to_name);
350
351		/*
352		 * Re-open our fd on the target, in case we used a strip
353		 * that does not work in-place -- like GNU binutils strip.
354		 */
355		close(to_fd);
356		to_fd = open(tempcopy ? tempfile : to_name, O_RDONLY, 0);
357		if (to_fd < 0)
358			err(EX_OSERR, "stripping %s", to_name);
359	}
360
361	/*
362	 * Compare the stripped temp file with the target.
363	 */
364	if (docompare && dostrip && target) {
365		temp_fd = to_fd;
366
367		/* Re-open to_fd using the real target name. */
368		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
369			err(EX_OSERR, "%s", to_name);
370
371		if (fstat(temp_fd, &temp_sb)) {
372			serrno = errno;
373			(void)unlink(tempfile);
374			errno = serrno;
375			err(EX_OSERR, "%s", tempfile);
376		}
377
378		if (compare(temp_fd, tempfile, (size_t)temp_sb.st_size, to_fd,
379			    to_name, (size_t)to_sb.st_size) == 0) {
380			/*
381			 * If target has more than one link we need to
382			 * replace it in order to snap the extra links.
383			 * Need to preserve target file times, though.
384			 */
385			if (to_sb.st_nlink != 1) {
386				utb.actime = to_sb.st_atime;
387				utb.modtime = to_sb.st_mtime;
388				(void)utime(tempfile, &utb);
389			} else {
390				files_match = 1;
391				(void)unlink(tempfile);
392			}
393			(void) close(temp_fd);
394		}
395	}
396
397	/*
398	 * Move the new file into place if doing a safe copy
399	 * and the files are different (or just not compared).
400	 */
401	if (tempcopy && !files_match) {
402		/* Try to turn off the immutable bits. */
403		if (to_sb.st_flags & NOCHANGEBITS)
404			(void)chflags(to_name, to_sb.st_flags & ~NOCHANGEBITS);
405		if (dobackup) {
406			if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s", to_name,
407			    suffix) != strlen(to_name) + strlen(suffix)) {
408				unlink(tempfile);
409				errx(EX_OSERR, "%s: backup filename too long",
410				    to_name);
411			}
412			if (verbose)
413				(void)printf("install: %s -> %s\n", to_name, backup);
414			if (rename(to_name, backup) < 0) {
415				serrno = errno;
416				unlink(tempfile);
417				errno = serrno;
418				err(EX_OSERR, "rename: %s to %s", to_name,
419				     backup);
420			}
421		}
422		if (verbose)
423			(void)printf("install: %s -> %s\n", from_name, to_name);
424		if (rename(tempfile, to_name) < 0) {
425			serrno = errno;
426			unlink(tempfile);
427			errno = serrno;
428			err(EX_OSERR, "rename: %s to %s",
429			    tempfile, to_name);
430		}
431
432		/* Re-open to_fd so we aren't hosed by the rename(2). */
433		(void) close(to_fd);
434		if ((to_fd = open(to_name, O_RDONLY, 0)) < 0)
435			err(EX_OSERR, "%s", to_name);
436	}
437
438	/*
439	 * Preserve the timestamp of the source file if necessary.
440	 */
441	if (dopreserve && !files_match && !devnull) {
442		utb.actime = from_sb.st_atime;
443		utb.modtime = from_sb.st_mtime;
444		(void)utime(to_name, &utb);
445	}
446
447	if (fstat(to_fd, &to_sb) == -1) {
448		serrno = errno;
449		(void)unlink(to_name);
450		errno = serrno;
451		err(EX_OSERR, "%s", to_name);
452	}
453
454	/*
455	 * Set owner, group, mode for target; do the chown first,
456	 * chown may lose the setuid bits.
457	 */
458	if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
459	    (uid != (uid_t)-1 && uid != to_sb.st_uid) ||
460	    (mode != to_sb.st_mode)) {
461		/* Try to turn off the immutable bits. */
462		if (to_sb.st_flags & NOCHANGEBITS)
463			(void)fchflags(to_fd, to_sb.st_flags & ~NOCHANGEBITS);
464	}
465
466	if ((gid != (gid_t)-1 && gid != to_sb.st_gid) ||
467	    (uid != (uid_t)-1 && uid != to_sb.st_uid))
468		if (fchown(to_fd, uid, gid) == -1) {
469			serrno = errno;
470			(void)unlink(to_name);
471			errno = serrno;
472			err(EX_OSERR,"%s: chown/chgrp", to_name);
473		}
474
475	if (mode != to_sb.st_mode)
476		if (fchmod(to_fd, mode)) {
477			serrno = errno;
478			(void)unlink(to_name);
479			errno = serrno;
480			err(EX_OSERR, "%s: chmod", to_name);
481		}
482
483	/*
484	 * If provided a set of flags, set them, otherwise, preserve the
485	 * flags, except for the dump flag.
486	 * NFS does not support flags.  Ignore EOPNOTSUPP flags if we're just
487	 * trying to turn off UF_NODUMP.  If we're trying to set real flags,
488	 * then warn if the the fs doesn't support it, otherwise fail.
489	 */
490	if (!devnull && fchflags(to_fd,
491	    flags & SETFLAGS ? fset : from_sb.st_flags & ~UF_NODUMP)) {
492		if (flags & SETFLAGS) {
493			if (errno == EOPNOTSUPP)
494				warn("%s: chflags", to_name);
495			else {
496				serrno = errno;
497				(void)unlink(to_name);
498				errno = serrno;
499				err(EX_OSERR, "%s: chflags", to_name);
500			}
501		}
502	}
503
504	(void)close(to_fd);
505	if (!devnull)
506		(void)close(from_fd);
507}
508
509/*
510 * compare --
511 *	compare two files; non-zero means files differ
512 */
513int
514compare(int from_fd, const char *from_name __unused, size_t from_len,
515	int to_fd, const char *to_name __unused, size_t to_len)
516{
517	char *p, *q;
518	int rv;
519	int done_compare;
520
521	rv = 0;
522	if (from_len != to_len)
523		return 1;
524
525	if (from_len <= MAX_CMP_SIZE) {
526		done_compare = 0;
527		if (trymmap(from_fd) && trymmap(to_fd)) {
528			p = mmap(NULL, from_len, PROT_READ, MAP_SHARED, from_fd, (off_t)0);
529			if (p == (char *)MAP_FAILED)
530				goto out;
531			q = mmap(NULL, from_len, PROT_READ, MAP_SHARED, to_fd, (off_t)0);
532			if (q == (char *)MAP_FAILED) {
533				munmap(p, from_len);
534				goto out;
535			}
536
537			rv = memcmp(p, q, from_len);
538			munmap(p, from_len);
539			munmap(q, from_len);
540			done_compare = 1;
541		}
542	out:
543		if (!done_compare) {
544			char buf1[MAXBSIZE];
545			char buf2[MAXBSIZE];
546			int n1, n2;
547
548			rv = 0;
549			lseek(from_fd, 0, SEEK_SET);
550			lseek(to_fd, 0, SEEK_SET);
551			while (rv == 0) {
552				n1 = read(from_fd, buf1, sizeof(buf1));
553				if (n1 == 0)
554					break;		/* EOF */
555				else if (n1 > 0) {
556					n2 = read(to_fd, buf2, n1);
557					if (n2 == n1)
558						rv = memcmp(buf1, buf2, n1);
559					else
560						rv = 1;	/* out of sync */
561				} else
562					rv = 1;		/* read failure */
563			}
564			lseek(from_fd, 0, SEEK_SET);
565			lseek(to_fd, 0, SEEK_SET);
566		}
567	} else
568		rv = 1;	/* don't bother in this case */
569
570	return rv;
571}
572
573/*
574 * create_tempfile --
575 *	create a temporary file based on path and open it
576 */
577int
578create_tempfile(path, temp, tsize)
579	const char *path;
580	char *temp;
581	size_t tsize;
582{
583	char *p;
584
585	(void)strncpy(temp, path, tsize);
586	temp[tsize - 1] = '\0';
587	if ((p = strrchr(temp, '/')) != NULL)
588		p++;
589	else
590		p = temp;
591	(void)strncpy(p, "INS@XXXX", &temp[tsize - 1] - p);
592	temp[tsize - 1] = '\0';
593	return (mkstemp(temp));
594}
595
596/*
597 * create_newfile --
598 *	create a new file, overwriting an existing one if necessary
599 */
600int
601create_newfile(path, target, sbp)
602	const char *path;
603	int target;
604	struct stat *sbp;
605{
606	char backup[MAXPATHLEN];
607
608	if (target) {
609		/*
610		 * Unlink now... avoid ETXTBSY errors later.  Try to turn
611		 * off the append/immutable bits -- if we fail, go ahead,
612		 * it might work.
613		 */
614		if (sbp->st_flags & NOCHANGEBITS)
615			(void)chflags(path, sbp->st_flags & ~NOCHANGEBITS);
616
617		if (dobackup) {
618			if ((size_t)snprintf(backup, MAXPATHLEN, "%s%s",
619			    path, suffix) != strlen(path) + strlen(suffix))
620				errx(EX_OSERR, "%s: backup filename too long",
621				    path);
622			(void)snprintf(backup, MAXPATHLEN, "%s%s",
623			    path, suffix);
624			if (verbose)
625				(void)printf("install: %s -> %s\n",
626				    path, backup);
627			if (rename(path, backup) < 0)
628				err(EX_OSERR, "rename: %s to %s", path, backup);
629		} else
630			(void)unlink(path);
631	}
632
633	return (open(path, O_CREAT | O_RDWR | O_TRUNC, S_IRUSR | S_IWUSR));
634}
635
636/*
637 * copy --
638 *	copy from one file to another
639 */
640void
641copy(from_fd, from_name, to_fd, to_name, size)
642	register int from_fd, to_fd;
643	const char *from_name, *to_name;
644	off_t size;
645{
646	register int nr, nw;
647	int serrno;
648	char *p, buf[MAXBSIZE];
649	int done_copy;
650
651	/* Rewind file descriptors. */
652	if (lseek(from_fd, (off_t)0, SEEK_SET) == (off_t)-1)
653		err(EX_OSERR, "lseek: %s", from_name);
654	if (lseek(to_fd, (off_t)0, SEEK_SET) == (off_t)-1)
655		err(EX_OSERR, "lseek: %s", to_name);
656
657	/*
658	 * Mmap and write if less than 8M (the limit is so we don't totally
659	 * trash memory on big files.  This is really a minor hack, but it
660	 * wins some CPU back.
661	 */
662	done_copy = 0;
663	if (size <= 8 * 1048576 && trymmap(from_fd) &&
664	    (p = mmap(NULL, (size_t)size, PROT_READ, MAP_SHARED,
665		    from_fd, (off_t)0)) != (char *)MAP_FAILED) {
666		if ((nw = write(to_fd, p, size)) != size) {
667			serrno = errno;
668			(void)unlink(to_name);
669			errno = nw > 0 ? EIO : serrno;
670			err(EX_OSERR, "%s", to_name);
671		}
672		done_copy = 1;
673	}
674	if (!done_copy) {
675		while ((nr = read(from_fd, buf, sizeof(buf))) > 0)
676			if ((nw = write(to_fd, buf, nr)) != nr) {
677				serrno = errno;
678				(void)unlink(to_name);
679				errno = nw > 0 ? EIO : serrno;
680				err(EX_OSERR, "%s", to_name);
681			}
682		if (nr != 0) {
683			serrno = errno;
684			(void)unlink(to_name);
685			errno = serrno;
686			err(EX_OSERR, "%s", from_name);
687		}
688	}
689}
690
691/*
692 * strip --
693 *	use strip(1) to strip the target file
694 */
695void
696strip(to_name)
697	const char *to_name;
698{
699	const char *stripbin;
700	int serrno, status;
701
702	switch (fork()) {
703	case -1:
704		serrno = errno;
705		(void)unlink(to_name);
706		errno = serrno;
707		err(EX_TEMPFAIL, "fork");
708	case 0:
709		stripbin = getenv("STRIPBIN");
710		if (stripbin == NULL)
711			stripbin = "strip";
712		execlp(stripbin, stripbin, to_name, (char *)NULL);
713		err(EX_OSERR, "exec(%s)", stripbin);
714	default:
715		if (wait(&status) == -1 || status) {
716			serrno = errno;
717			(void)unlink(to_name);
718			errc(EX_SOFTWARE, serrno, "wait");
719			/* NOTREACHED */
720		}
721	}
722}
723
724/*
725 * install_dir --
726 *	build directory heirarchy
727 */
728void
729install_dir(path)
730	char *path;
731{
732	register char *p;
733	struct stat sb;
734	int ch;
735
736	for (p = path;; ++p)
737		if (!*p || (p != path && *p  == '/')) {
738			ch = *p;
739			*p = '\0';
740			if (stat(path, &sb)) {
741				if (errno != ENOENT || mkdir(path, 0755) < 0) {
742					err(EX_OSERR, "mkdir %s", path);
743					/* NOTREACHED */
744				} else if (verbose)
745					(void)printf("install: mkdir %s\n",
746						     path);
747			} else if (!S_ISDIR(sb.st_mode))
748				errx(EX_OSERR, "%s exists but is not a directory", path);
749			if (!(*p = ch))
750				break;
751 		}
752
753	if ((gid != (gid_t)-1 || uid != (uid_t)-1) && chown(path, uid, gid))
754		warn("chown %u:%u %s", uid, gid, path);
755	if (chmod(path, mode))
756		warn("chmod %o %s", mode, path);
757}
758
759/*
760 * usage --
761 *	print a usage message and die
762 */
763void
764usage()
765{
766	(void)fprintf(stderr, "\
767usage: install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
768               [-o owner] file1 file2\n\
769       install [-bCcpSsv] [-B suffix] [-f flags] [-g group] [-m mode]\n\
770               [-o owner] file1 ... fileN directory\n\
771       install -d [-v] [-g group] [-m mode] [-o owner] directory ...\n");
772	exit(EX_USAGE);
773	/* NOTREACHED */
774}
775
776/*
777 * trymmap --
778 *	return true (1) if mmap should be tried, false (0) if not.
779 */
780int
781trymmap(fd)
782	int fd;
783{
784/*
785 * The ifdef is for bootstrapping - f_fstypename doesn't exist in
786 * pre-Lite2-merge systems.
787 */
788#ifdef MFSNAMELEN
789	struct statfs stfs;
790
791	if (nommap || fstatfs(fd, &stfs) != 0)
792		return (0);
793	if (strcmp(stfs.f_fstypename, "ufs") == 0 ||
794	    strcmp(stfs.f_fstypename, "cd9660") == 0)
795		return (1);
796#endif
797	return (0);
798}
799