1 /***********************************************************************
2 * *
3 * This software is part of the ast package *
4 * Copyright (c) 1992-2010 AT&T Intellectual Property *
5 * and is licensed under the *
6 * Common Public License, Version 1.0 *
7 * by AT&T Intellectual Property *
8 * *
9 * A copy of the License is available at *
10 * http://www.opensource.org/licenses/cpl1.0.txt *
11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
12 * *
13 * Information and Software Systems Research *
14 * AT&T Research *
15 * Florham Park NJ *
16 * *
17 * Glenn Fowler <gsf@research.att.com> *
18 * David Korn <dgk@research.att.com> *
19 * *
20 ***********************************************************************/
21 #pragma prototyped
22 /*
23 * David Korn
24 * Glenn Fowler
25 * AT&T Research
26 *
27 * chmod
28 */
29
30 static const char usage[] =
31 "[-?\n@(#)$Id: chmod (AT&T Research) 2009-07-02 $\n]"
32 USAGE_LICENSE
33 "[+NAME?chmod - change the access permissions of files]"
34 "[+DESCRIPTION?\bchmod\b changes the permission of each file "
35 "according to mode, which can be either a symbolic representation "
36 "of changes to make, or an octal number representing the bit "
37 "pattern for the new permissions.]"
38 "[+?Symbolic mode strings consist of one or more comma separated list "
39 "of operations that can be perfomed on the mode. Each operation is of "
40 "the form \auser\a \aop\a \aperm\a where \auser\a is zero or more of "
41 "the following letters:]{"
42 "[+u?User permission bits.]"
43 "[+g?Group permission bits.]"
44 "[+o?Other permission bits.]"
45 "[+a?All permission bits. This is the default if none are specified.]"
46 "}"
47 "[+?The \aperm\a portion consists of zero or more of the following letters:]{"
48 "[+r?Read permission.]"
49 "[+s?Setuid when \bu\b is selected for \awho\a and setgid when \bg\b "
50 "is selected for \awho\a.]"
51 "[+w?Write permission.]"
52 "[+x?Execute permission for files, search permission for directories.]"
53 "[+X?Same as \bx\b except that it is ignored for files that do not "
54 "already have at least one \bx\b bit set.]"
55 "[+l?Exclusive lock bit on systems that support it. Group execute "
56 "must be off.]"
57 "[+t?Sticky bit on systems that support it.]"
58 "}"
59 "[+?The \aop\a portion consists of one or more of the following characters:]{"
60 "[++?Cause the permission selected to be added to the existing "
61 "permissions. | is equivalent to +.]"
62 "[+-?Cause the permission selected to be removed to the existing "
63 "permissions.]"
64 "[+=?Cause the permission to be set to the given permissions.]"
65 "[+&?Cause the permission selected to be \aand\aed with the existing "
66 "permissions.]"
67 "[+^?Cause the permission selected to be propagated to more "
68 "restrictive groups.]"
69 "}"
70 "[+?Symbolic modes with the \auser\a portion omitted are subject to "
71 "\bumask\b(2) settings unless the \b=\b \aop\a or the "
72 "\b--ignore-umask\b option is specified.]"
73 "[+?A numeric mode is from one to four octal digits (0-7), "
74 "derived by adding up the bits with values 4, 2, and 1. "
75 "Any omitted digits are assumed to be leading zeros. The "
76 "first digit selects the set user ID (4) and set group ID "
77 "(2) and save text image (1) attributes. The second digit "
78 "selects permissions for the user who owns the file: read "
79 "(4), write (2), and execute (1); the third selects permissions"
80 "for other users in the file's group, with the same values; "
81 "and the fourth for other users not in the file's group, with "
82 "the same values.]"
83
84 "[+?For symbolic links, by default, \bchmod\b changes the mode on the file "
85 "referenced by the symbolic link, not on the symbolic link itself. "
86 "The \b-h\b options can be specified to change the mode of the link. "
87 "When traversing directories with \b-R\b, \bchmod\b either follows "
88 "symbolic links or does not follow symbolic links, based on the "
89 "options \b-H\b, \b-L\b, and \b-P\b. The configuration parameter "
90 "\bPATH_RESOLVE\b determines the default behavior if none of these "
91 "options is specified.]"
92
93 "[+?When the \b-c\b or \b-v\b options are specified, change notifications "
94 "are written to standard output using the format, "
95 "\b%s: mode changed to %0.4o (%s)\b, with arguments of the "
96 "pathname, the numeric mode, and the resulting permission bits as "
97 "would be displayed by the \bls\b command.]"
98
99 "[+?For backwards compatibility, if an invalid option is given that is a valid "
100 "symbolic mode specification, \bchmod\b treats this as a mode "
101 "specification rather than as an option specification.]"
102
103 "[H:metaphysical?Follow symbolic links for command arguments; otherwise don't "
104 "follow symbolic links when traversing directories.]"
105 "[L:logical|follow?Follow symbolic links when traversing directories.]"
106 "[P:physical|nofollow?Don't follow symbolic links when traversing directories.]"
107 "[R:recursive?Change the mode for files in subdirectories recursively.]"
108 "[c:changes?Describe only files whose permission actually change.]"
109 "[f:quiet|silent?Do not report files whose permissioins fail to change.]"
110 "[h:symlink?Change the mode of the symbolic links on systems that "
111 "support this.]"
112 "[i:ignore-umask?Ignore the \bumask\b(2) value in symbolic mode "
113 "expressions. This is probably how you expect \bchmod\b to work.]"
114 "[n:show?Show actions but do not change any file modes.]"
115 "[F:reference?Omit the \amode\a operand and use the mode of \afile\a "
116 "instead.]:[file]"
117 "[v:verbose?Describe changed permissions of all files.]"
118 "\n"
119 "\nmode file ...\n"
120 "\n"
121 "[+EXIT STATUS?]{"
122 "[+0?All files changed successfully.]"
123 "[+>0?Unable to change mode of one or more files.]"
124 "}"
125 "[+SEE ALSO?\bchgrp\b(1), \bchown\b(1), \btw\b(1), \bgetconf\b(1), \bls\b(1), "
126 "\bumask\b(2)]"
127 ;
128
129
130 #if defined(__STDPP__directive) && defined(__STDPP__hide)
131 __STDPP__directive pragma pp:hide lchmod
132 #else
133 #define lchmod ______lchmod
134 #endif
135
136 #include <cmd.h>
137 #include <ls.h>
138 #include <fts_fix.h>
139
140 #include "FEATURE/symlink"
141
142 #if defined(__STDPP__directive) && defined(__STDPP__hide)
143 __STDPP__directive pragma pp:nohide lchmod
144 #else
145 #undef lchmod
146 #endif
147
148 extern int lchmod(const char*, mode_t);
149
150 int
b_chmod(int argc,char ** argv,void * context)151 b_chmod(int argc, char** argv, void* context)
152 {
153 register int mode;
154 register int force = 0;
155 register int flags;
156 register char* amode = 0;
157 register FTS* fts;
158 register FTSENT*ent;
159 char* last;
160 int (*chmodf)(const char*, mode_t);
161 int logical = 1;
162 int notify = 0;
163 int ignore = 0;
164 int show = 0;
165 #if _lib_lchmod
166 int chlink = 0;
167 #endif
168 struct stat st;
169
170 cmdinit(argc, argv, context, ERROR_CATALOG, ERROR_NOTIFY);
171 flags = fts_flags() | FTS_TOP | FTS_NOPOSTORDER | FTS_NOSEEDOTDIR;
172
173 /*
174 * NOTE: we diverge from the normal optget boilerplate
175 * to allow `chmod -x etc' to fall through
176 */
177
178 for (;;)
179 {
180 switch (optget(argv, usage))
181 {
182 case 'c':
183 notify = 1;
184 continue;
185 case 'f':
186 force = 1;
187 continue;
188 case 'h':
189 #if _lib_lchmod
190 chlink = 1;
191 #endif
192 continue;
193 case 'i':
194 ignore = 1;
195 continue;
196 case 'n':
197 show = 1;
198 continue;
199 case 'v':
200 notify = 2;
201 continue;
202 case 'F':
203 if (stat(opt_info.arg, &st))
204 error(ERROR_exit(1), "%s: cannot stat", opt_info.arg);
205 mode = st.st_mode;
206 amode = "";
207 continue;
208 case 'H':
209 flags |= FTS_META|FTS_PHYSICAL;
210 logical = 0;
211 continue;
212 case 'L':
213 flags &= ~(FTS_META|FTS_PHYSICAL);
214 logical = 0;
215 continue;
216 case 'P':
217 flags &= ~FTS_META;
218 flags |= FTS_PHYSICAL;
219 logical = 0;
220 continue;
221 case 'R':
222 flags &= ~FTS_TOP;
223 logical = 0;
224 continue;
225 case '?':
226 error(ERROR_usage(2), "%s", opt_info.arg);
227 break;
228 }
229 break;
230 }
231 argv += opt_info.index;
232 if (error_info.errors || !*argv || !amode && !*(argv + 1))
233 error(ERROR_usage(2), "%s", optusage(NiL));
234 if (logical)
235 flags &= ~(FTS_META|FTS_PHYSICAL);
236 if (ignore)
237 ignore = umask(0);
238 if (amode)
239 amode = 0;
240 else
241 {
242 amode = *argv++;
243 mode = strperm(amode, &last, 0);
244 if (*last)
245 {
246 if (ignore)
247 umask(ignore);
248 error(ERROR_exit(1), "%s: invalid mode", amode);
249 }
250 }
251 chmodf =
252 #if _lib_lchmod
253 chlink ? lchmod :
254 #endif
255 chmod;
256 if (!(fts = fts_open(argv, flags, NiL)))
257 {
258 if (ignore)
259 umask(ignore);
260 error(ERROR_system(1), "%s: not found", *argv);
261 }
262 while (!sh_checksig(context) && (ent = fts_read(fts)))
263 switch (ent->fts_info)
264 {
265 case FTS_SL:
266 if (chmodf == chmod)
267 {
268 if (!(flags & FTS_PHYSICAL) || (flags & FTS_META) && ent->fts_level == 1)
269 fts_set(NiL, ent, FTS_FOLLOW);
270 break;
271 }
272 /*FALLTHROUGH*/
273 case FTS_F:
274 case FTS_D:
275 case FTS_SLNONE:
276 anyway:
277 if (amode)
278 mode = strperm(amode, &last, ent->fts_statp->st_mode);
279 if (show || (*chmodf)(ent->fts_accpath, mode) >= 0)
280 {
281 if (notify == 2 || notify == 1 && (mode&S_IPERM) != (ent->fts_statp->st_mode&S_IPERM))
282 sfprintf(sfstdout, "%s: mode changed to %0.4o (%s)\n", ent->fts_path, mode, fmtmode(mode, 1)+1);
283 }
284 else if (!force)
285 error(ERROR_system(0), "%s: cannot change mode", ent->fts_accpath);
286 break;
287 case FTS_DC:
288 if (!force)
289 error(ERROR_warn(0), "%s: directory causes cycle", ent->fts_accpath);
290 break;
291 case FTS_DNR:
292 if (!force)
293 error(ERROR_system(0), "%s: cannot read directory", ent->fts_accpath);
294 goto anyway;
295 case FTS_DNX:
296 if (!force)
297 error(ERROR_system(0), "%s: cannot search directory", ent->fts_accpath);
298 goto anyway;
299 case FTS_NS:
300 if (!force)
301 error(ERROR_system(0), "%s: not found", ent->fts_accpath);
302 break;
303 }
304 fts_close(fts);
305 if (ignore)
306 umask(ignore);
307 return error_info.errors != 0;
308 }
309