rm.c revision 1.8 
1/*	$OpenBSD: rm.c,v 1.8 2016/10/10 18:07:03 tedu Exp $	*/
2/*	$NetBSD: rm.c,v 1.19 1995/09/07 06:48:50 jtc Exp $	*/
3
4/*-
5 * Copyright (c) 1990, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
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. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/types.h>
34#include <sys/stat.h>
35#include <sys/mount.h>
36
37#include <err.h>
38#include <errno.h>
39#include <fcntl.h>
40#include <fts.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <unistd.h>
45#include <limits.h>
46#include <pwd.h>
47#include <grp.h>
48
49#define MAXIMUM(a, b)	(((a) > (b)) ? (a) : (b))
50
51extern char *__progname;
52
53static int eval, stdin_ok;
54
55static void	checkdot(char **);
56static void	rm_tree(char **);
57
58static void __dead
59usage(void)
60{
61	(void)fprintf(stderr, "usage: %s [-dfiPRr] file ...\n", __progname);
62	exit(1);
63}
64
65/*
66 * rm --
67 *	This rm is different from historic rm's, but is expected to match
68 *	POSIX 1003.2 behavior.  The most visible difference is that -f
69 *	has two specific effects now, ignore non-existent files and force
70 * 	file removal.
71 */
72int
73rmmain(int argc, char *argv[])
74{
75
76	checkdot(argv);
77
78	if (*argv) {
79		stdin_ok = isatty(STDIN_FILENO);
80
81		rm_tree(argv);
82	}
83
84	return (eval);
85}
86
87static void
88rm_tree(char **argv)
89{
90	FTS *fts;
91	FTSENT *p;
92	int flags;
93
94	/*
95	 * If the -i option is specified, the user can skip on the pre-order
96	 * visit.  The fts_number field flags skipped directories.
97	 */
98#define	SKIPPED	1
99
100	flags = FTS_PHYSICAL;
101	flags |= FTS_NOSTAT;
102	if (!(fts = fts_open(argv, flags, NULL)))
103		err(1, NULL);
104	while ((p = fts_read(fts)) != NULL) {
105		switch (p->fts_info) {
106		case FTS_DNR:
107			if (p->fts_errno != ENOENT) {
108				warnx("%s: %s",
109				    p->fts_path, strerror(p->fts_errno));
110				eval = 1;
111			}
112			continue;
113		case FTS_ERR:
114			errc(1, p->fts_errno, "%s", p->fts_path);
115		case FTS_NS:
116			/*
117			 * FTS_NS: assume that if can't stat the file, it
118			 * can't be unlinked.
119			 */
120			break;
121		case FTS_D:
122			/* Pre-order: give user chance to skip. */
123			continue;
124		case FTS_DP:
125			/* Post-order: see if user skipped. */
126			if (p->fts_number == SKIPPED)
127				continue;
128			break;
129		default:
130			break;
131		}
132
133		/*
134		 * If we can't read or search the directory, may still be
135		 * able to remove it.  Don't print out the un{read,search}able
136		 * message unless the remove fails.
137		 */
138		switch (p->fts_info) {
139		case FTS_DP:
140		case FTS_DNR:
141			if (!rmdir(p->fts_accpath) ||
142			    (errno == ENOENT))
143				continue;
144			break;
145
146		case FTS_F:
147		case FTS_NSOK:
148		default:
149			if (!unlink(p->fts_accpath) ||
150			    (errno == ENOENT))
151				continue;
152		}
153		warn("%s", p->fts_path);
154		eval = 1;
155	}
156	if (errno)
157		err(1, "fts_read");
158	fts_close(fts);
159}
160
161/*
162 * POSIX.2 requires that if "." or ".." are specified as the basename
163 * portion of an operand, a diagnostic message be written to standard
164 * error and nothing more be done with such operands.
165 *
166 * Since POSIX.2 defines basename as the final portion of a path after
167 * trailing slashes have been removed, we'll remove them here.
168 */
169#define ISDOT(a)	((a)[0] == '.' && (!(a)[1] || ((a)[1] == '.' && !(a)[2])))
170static void
171checkdot(char **argv)
172{
173	char *p, **save, **t;
174	int complained;
175
176	complained = 0;
177	for (t = argv; *t;) {
178		/* strip trailing slashes */
179		p = strrchr (*t, '\0');
180		while (--p > *t && *p == '/')
181			*p = '\0';
182
183		/* extract basename */
184		if ((p = strrchr(*t, '/')) != NULL)
185			++p;
186		else
187			p = *t;
188
189		if (ISDOT(p)) {
190			if (!complained++)
191				warnx("\".\" and \"..\" may not be removed");
192			eval = 1;
193			for (save = t; (t[0] = t[1]) != NULL; ++t)
194				continue;
195			t = save;
196		} else
197			++t;
198	}
199}
200