[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini chmod implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Reworked by (C) 2002 Vladimir Oleynik <dzo@simtreas.ru>
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| 8 | * to correctly parse '-rwxgoa'
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| 9 | *
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[2725] | 10 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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[821] | 11 | */
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| 12 |
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| 13 | /* BB_AUDIT SUSv3 compliant */
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[1765] | 14 | /* BB_AUDIT GNU defects - unsupported long options. */
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[821] | 15 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/chmod.html */
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| 16 |
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[3232] | 17 | //usage:#define chmod_trivial_usage
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| 18 | //usage: "[-R"IF_DESKTOP("cvf")"] MODE[,MODE]... FILE..."
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| 19 | //usage:#define chmod_full_usage "\n\n"
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| 20 | //usage: "Each MODE is one or more of the letters ugoa, one of the\n"
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| 21 | //usage: "symbols +-= and one or more of the letters rwxst\n"
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| 22 | //usage: "\n -R Recurse"
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| 23 | //usage: IF_DESKTOP(
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| 24 | //usage: "\n -c List changed files"
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| 25 | //usage: "\n -v List all files"
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| 26 | //usage: "\n -f Hide errors"
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| 27 | //usage: )
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| 28 | //usage:
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| 29 | //usage:#define chmod_example_usage
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| 30 | //usage: "$ ls -l /tmp/foo\n"
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| 31 | //usage: "-rw-rw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
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| 32 | //usage: "$ chmod u+x /tmp/foo\n"
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| 33 | //usage: "$ ls -l /tmp/foo\n"
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| 34 | //usage: "-rwxrw-r-- 1 root root 0 Apr 12 18:25 /tmp/foo*\n"
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| 35 | //usage: "$ chmod 444 /tmp/foo\n"
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| 36 | //usage: "$ ls -l /tmp/foo\n"
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| 37 | //usage: "-r--r--r-- 1 root root 0 Apr 12 18:25 /tmp/foo\n"
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| 38 |
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[1765] | 39 | #include "libbb.h"
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[821] | 40 |
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[1765] | 41 | /* This is a NOEXEC applet. Be very careful! */
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| 42 |
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| 43 |
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| 44 | #define OPT_RECURSE (option_mask32 & 1)
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[2725] | 45 | #define OPT_VERBOSE (IF_DESKTOP(option_mask32 & 2) IF_NOT_DESKTOP(0))
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| 46 | #define OPT_CHANGED (IF_DESKTOP(option_mask32 & 4) IF_NOT_DESKTOP(0))
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| 47 | #define OPT_QUIET (IF_DESKTOP(option_mask32 & 8) IF_NOT_DESKTOP(0))
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| 48 | #define OPT_STR "R" IF_DESKTOP("vcf")
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[1765] | 49 |
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| 50 | /* coreutils:
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| 51 | * chmod never changes the permissions of symbolic links; the chmod
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| 52 | * system call cannot change their permissions. This is not a problem
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| 53 | * since the permissions of symbolic links are never used.
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| 54 | * However, for each symbolic link listed on the command line, chmod changes
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| 55 | * the permissions of the pointed-to file. In contrast, chmod ignores
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| 56 | * symbolic links encountered during recursive directory traversals.
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| 57 | */
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| 58 |
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[2725] | 59 | static int FAST_FUNC fileAction(const char *fileName, struct stat *statbuf, void* param, int depth)
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[821] | 60 | {
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[1765] | 61 | mode_t newmode;
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| 62 |
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| 63 | /* match coreutils behavior */
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| 64 | if (depth == 0) {
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| 65 | /* statbuf holds lstat result, but we need stat (follow link) */
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| 66 | if (stat(fileName, statbuf))
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| 67 | goto err;
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| 68 | } else { /* depth > 0: skip links */
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| 69 | if (S_ISLNK(statbuf->st_mode))
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| 70 | return TRUE;
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| 71 | }
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| 72 | newmode = statbuf->st_mode;
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| 73 |
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| 74 | if (!bb_parse_mode((char *)param, &newmode))
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[2725] | 75 | bb_error_msg_and_die("invalid mode '%s'", (char *)param);
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[1765] | 76 |
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| 77 | if (chmod(fileName, newmode) == 0) {
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| 78 | if (OPT_VERBOSE
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| 79 | || (OPT_CHANGED && statbuf->st_mode != newmode)
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| 80 | ) {
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| 81 | printf("mode of '%s' changed to %04o (%s)\n", fileName,
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| 82 | newmode & 07777, bb_mode_string(newmode)+1);
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| 83 | }
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| 84 | return TRUE;
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| 85 | }
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| 86 | err:
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| 87 | if (!OPT_QUIET)
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[2725] | 88 | bb_simple_perror_msg(fileName);
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[1765] | 89 | return FALSE;
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[821] | 90 | }
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| 91 |
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[2725] | 92 | int chmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 93 | int chmod_main(int argc UNUSED_PARAM, char **argv)
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[821] | 94 | {
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| 95 | int retval = EXIT_SUCCESS;
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[1765] | 96 | char *arg, **argp;
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[821] | 97 | char *smode;
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| 98 |
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[1765] | 99 | /* Convert first encountered -r into ar, -w into aw etc
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| 100 | * so that getopt would not eat it */
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| 101 | argp = argv;
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| 102 | while ((arg = *++argp)) {
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| 103 | /* Mode spec must be the first arg (sans -R etc) */
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| 104 | /* (protect against mishandling e.g. "chmod 644 -r") */
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| 105 | if (arg[0] != '-') {
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| 106 | arg = NULL;
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| 107 | break;
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[821] | 108 | }
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[1765] | 109 | /* An option. Not a -- or valid option? */
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| 110 | if (arg[1] && !strchr("-"OPT_STR, arg[1])) {
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| 111 | arg[0] = 'a';
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| 112 | break;
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| 113 | }
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[821] | 114 | }
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| 115 |
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[1765] | 116 | /* Parse options */
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| 117 | opt_complementary = "-2";
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| 118 | getopt32(argv, ("-"OPT_STR) + 1); /* Reuse string */
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| 119 | argv += optind;
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[821] | 120 |
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[1765] | 121 | /* Restore option-like mode if needed */
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| 122 | if (arg) arg[0] = '-';
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[821] | 123 |
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| 124 | /* Ok, ready to do the deed now */
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[1765] | 125 | smode = *argv++;
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[821] | 126 | do {
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[1765] | 127 | if (!recursive_action(*argv,
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| 128 | OPT_RECURSE, // recurse
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| 129 | fileAction, // file action
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| 130 | fileAction, // dir action
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| 131 | smode, // user data
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| 132 | 0) // depth
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| 133 | ) {
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[821] | 134 | retval = EXIT_FAILURE;
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| 135 | }
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| 136 | } while (*++argv);
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| 137 |
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| 138 | return retval;
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| 139 | }
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[1765] | 140 |
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| 141 | /*
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| 142 | Security: chmod is too important and too subtle.
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| 143 | This is a test script (busybox chmod versus coreutils).
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| 144 | Run it in empty directory.
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| 145 |
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| 146 | #!/bin/sh
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| 147 | t1="/tmp/busybox chmod"
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| 148 | t2="/usr/bin/chmod"
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| 149 | create() {
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| 150 | rm -rf $1; mkdir $1
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| 151 | (
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| 152 | cd $1 || exit 1
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| 153 | mkdir dir
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| 154 | >up
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| 155 | >file
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| 156 | >dir/file
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| 157 | ln -s dir linkdir
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| 158 | ln -s file linkfile
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| 159 | ln -s ../up dir/up
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| 160 | )
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| 161 | }
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| 162 | tst() {
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| 163 | (cd test1; $t1 $1)
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| 164 | (cd test2; $t2 $1)
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| 165 | (cd test1; ls -lR) >out1
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| 166 | (cd test2; ls -lR) >out2
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| 167 | echo "chmod $1" >out.diff
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| 168 | if ! diff -u out1 out2 >>out.diff; then exit 1; fi
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| 169 | rm out.diff
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| 170 | }
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| 171 | echo "If script produced 'out.diff' file, then at least one testcase failed"
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| 172 | create test1; create test2
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| 173 | tst "a+w file"
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| 174 | tst "a-w dir"
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| 175 | tst "a+w linkfile"
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| 176 | tst "a-w linkdir"
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| 177 | tst "-R a+w file"
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| 178 | tst "-R a-w dir"
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| 179 | tst "-R a+w linkfile"
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| 180 | tst "-R a-w linkdir"
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| 181 | tst "a-r,a+x linkfile"
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| 182 | */
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