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)
69 int retval = EXIT_SUCCESS;
73 /* Convert first encountered -r into ar, -w into aw etc
74 * so that getopt would not eat it */
76 while ((arg = *++argp)) {
77 /* Mode spec must be the first arg (sans -R etc) */
78 /* (protect against mishandling e.g. "chmod 644 -r") */
83 /* An option. Not a -- or valid option? */
84 if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
91 opt_complementary = "-2";
92 getopt32(argc, argv, ("-"OPT_STR) + 1); /* Reuse string */
95 /* Restore option-like mode if needed */
96 if (arg) arg[0] = '-';
98 /* Ok, ready to do the deed now */
101 if (!recursive_action(*argv,
102 OPT_RECURSE, // recurse
103 FALSE, // follow links: coreutils doesn't
104 FALSE, // depth first
105 fileAction, // file action
106 fileAction, // dir action
110 retval = EXIT_FAILURE;
118 Security: chmod is too important and too subtle.
119 This is a test script (busybox chmod versus coreutils).
120 Run it in empty dir. Probably requires bash.
139 (cd test1; ls -lR) >out1
140 (cd test2; ls -lR) >out2
141 echo "chmod $1" >out.diff
142 if ! diff -u out1 out2 >>out.diff; then exit 1; fi
143 mv out.diff out1.diff
145 t1="/tmp/busybox chmod"
147 create test1; create test2
154 tst "-R a+w linkfile"
156 tst "a-r,a+x linkfile"