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 tarball for details.
13 /* BB_AUDIT SUSv3 compliant */
14 /* BB_AUDIT GNU defects - unsupported long options. */
15 /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
19 #define OPT_RECURSE (option_mask32 & 1)
20 #define OPT_VERBOSE (USE_DESKTOP(option_mask32 & 2) SKIP_DESKTOP(0))
21 #define OPT_CHANGED (USE_DESKTOP(option_mask32 & 4) SKIP_DESKTOP(0))
22 #define OPT_QUIET (USE_DESKTOP(option_mask32 & 8) SKIP_DESKTOP(0))
23 #define OPT_STR "R" USE_DESKTOP("vcf")
26 * chmod never changes the permissions of symbolic links; the chmod
27 * system call cannot change their permissions. This is not a problem
28 * since the permissions of symbolic links are never used.
29 * However, for each symbolic link listed on the command line, chmod changes
30 * the permissions of the pointed-to file. In contrast, chmod ignores
31 * symbolic links encountered during recursive directory traversals.
34 static int fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
38 /* match coreutils behavior */
40 /* statbuf holds lstat result, but we need stat (follow link) */
41 if (stat(fileName, statbuf))
43 } else { /* depth > 0: skip links */
44 if (S_ISLNK(statbuf->st_mode))
47 newmode = statbuf->st_mode;
49 if (!bb_parse_mode((char *)param, &newmode))
50 bb_error_msg_and_die("invalid mode: %s", (char *)param);
52 if (chmod(fileName, newmode) == 0) {
54 || (OPT_CHANGED && statbuf->st_mode != newmode)
56 printf("mode of '%s' changed to %04o (%s)\n", fileName,
57 newmode & 07777, bb_mode_string(newmode)+1);
63 bb_perror_msg("%s", fileName);
67 int chmod_main(int argc, char **argv);
68 int chmod_main(int argc, char **argv)
70 int retval = EXIT_SUCCESS;
74 /* Convert first encountered -r into ar, -w into aw etc
75 * so that getopt would not eat it */
77 while ((arg = *++argp)) {
78 /* Mode spec must be the first arg (sans -R etc) */
79 /* (protect against mishandling e.g. "chmod 644 -r") */
84 /* An option. Not a -- or valid option? */
85 if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
92 opt_complementary = "-2";
93 getopt32(argc, argv, ("-"OPT_STR) + 1); /* Reuse string */
96 /* Restore option-like mode if needed */
97 if (arg) arg[0] = '-';
99 /* Ok, ready to do the deed now */
102 if (!recursive_action(*argv,
103 OPT_RECURSE, // recurse
104 fileAction, // file action
105 fileAction, // dir action
109 retval = EXIT_FAILURE;
117 Security: chmod is too important and too subtle.
118 This is a test script (busybox chmod versus coreutils).
119 Run it in empty directory.
122 t1="/tmp/busybox chmod"
140 (cd test1; ls -lR) >out1
141 (cd test2; ls -lR) >out2
142 echo "chmod $1" >out.diff
143 if ! diff -u out1 out2 >>out.diff; then exit 1; fi
146 echo "If script produced 'out.diff' file, then at least one testcase failed"
147 create test1; create test2
154 tst "-R a+w linkfile"
156 tst "a-r,a+x linkfile"