1 /* vi: set sw=4 ts=4: */
3 * Mini chmod implementation for busybox
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
7 * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
8 * to correctly parse '-rwxgoa'
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
13 /* BB_AUDIT SUSv3 compliant */
14 /* BB_AUDIT GNU defects - unsupported long options. */
15 /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
17 //usage:#define chmod_trivial_usage
18 //usage: "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."
19 //usage:#define chmod_full_usage "\n\n"
20 //usage: "Each MODE is one or more of the letters ugoa, one of the\n"
21 //usage: "symbols +-= and one or more of the letters rwxst\n"
22 //usage: "\n -R Recurse"
24 //usage: "\n -c List changed files"
25 //usage: "\n -v List all files"
26 //usage: "\n -f Hide errors"
29 //usage:#define chmod_example_usage
30 //usage: "$ ls -l /tmp/foo\n"
31 //usage: "-rw-rw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
32 //usage: "$ chmod u+x /tmp/foo\n"
33 //usage: "$ ls -l /tmp/foo\n"
34 //usage: "-rwxrw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo*\n"
35 //usage: "$ chmod 444 /tmp/foo\n"
36 //usage: "$ ls -l /tmp/foo\n"
37 //usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
41 /* This is a NOEXEC applet. Be very careful! */
44 #define OPT_RECURSE (option_mask32 & 1)
45 #define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))
46 #define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))
47 #define OPT_QUIET (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))
48 #define OPT_STR "R" IF_DESKTOP("vcf")
51 * chmod never changes the permissions of symbolic links; the chmod
52 * system call cannot change their permissions. This is not a problem
53 * since the permissions of symbolic links are never used.
54 * However, for each symbolic link listed on the command line, chmod changes
55 * the permissions of the pointed-to file. In contrast, chmod ignores
56 * symbolic links encountered during recursive directory traversals.
59 static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
63 /* match coreutils behavior */
65 /* statbuf holds lstat result, but we need stat (follow link) */
66 if (stat(fileName, statbuf))
68 } else { /* depth > 0: skip links */
69 if (S_ISLNK(statbuf->st_mode))
72 newmode = statbuf->st_mode;
74 if (!bb_parse_mode((char *)param, &newmode))
75 bb_error_msg_and_die("invalid mode '%s'", (char *)param);
77 if (chmod(fileName, newmode) == 0) {
79 || (OPT_CHANGED && statbuf->st_mode != newmode)
81 printf("mode of '%s' changed to %04o (%s)\n", fileName,
82 newmode & 07777, bb_mode_string(newmode)+1);
88 bb_simple_perror_msg(fileName);
92 int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
93 int chmod_main(int argc UNUSED_PARAM, char **argv)
95 int retval = EXIT_SUCCESS;
99 /* Convert first encountered -r into ar, -w into aw etc
100 * so that getopt would not eat it */
102 while ((arg = *++argp)) {
103 /* Mode spec must be the first arg (sans -R etc) */
104 /* (protect against mishandling e.g. "chmod 644 -r") */
109 /* An option. Not a -- or valid option? */
110 if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
117 opt_complementary = "-2";
118 getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
121 /* Restore option-like mode if needed */
122 if (arg) arg[0] = '-';
124 /* Ok, ready to do the deed now */
127 if (!recursive_action(*argv,
128 OPT_RECURSE, // recurse
129 fileAction, // file action
130 fileAction, // dir action
134 retval = EXIT_FAILURE;
142 Security: chmod is too important and too subtle.
143 This is a test script (busybox chmod versus coreutils).
144 Run it in empty directory.
147 t1="/tmp/busybox chmod"
165 (cd test1; ls -lR) >out1
166 (cd test2; ls -lR) >out2
167 echo "chmod $1" >out.diff
168 if ! diff -u out1 out2 >>out.diff; then exit 1; fi
171 echo "If script produced 'out.diff' file, then at least one testcase failed"
172 create test1; create test2
179 tst "-R a+w linkfile"
181 tst "a-r,a+x linkfile"