1 /* chgrp -- change group ownership of files
2 Copyright (C) 1989-2013 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
21 #include <sys/types.h>
26 #include "chown-core.h"
30 #include "root-dev-ino.h"
33 /* The official name of this program (e.g., no 'g' prefix). */
34 #define PROGRAM_NAME "chgrp"
37 proper_name ("David MacKenzie"), \
38 proper_name ("Jim Meyering")
41 # define endgrent() ((void) 0)
44 /* The argument to the --reference option. Use the group ID of this file.
45 This file must exist. */
46 static char *reference_file;
48 /* For long options that have no equivalent short option, use a
49 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
52 DEREFERENCE_OPTION = CHAR_MAX + 1,
58 static struct option const long_options[] =
60 {"recursive", no_argument, NULL, 'R'},
61 {"changes", no_argument, NULL, 'c'},
62 {"dereference", no_argument, NULL, DEREFERENCE_OPTION},
63 {"no-dereference", no_argument, NULL, 'h'},
64 {"no-preserve-root", no_argument, NULL, NO_PRESERVE_ROOT},
65 {"preserve-root", no_argument, NULL, PRESERVE_ROOT},
66 {"quiet", no_argument, NULL, 'f'},
67 {"silent", no_argument, NULL, 'f'},
68 {"reference", required_argument, NULL, REFERENCE_FILE_OPTION},
69 {"verbose", no_argument, NULL, 'v'},
70 {GETOPT_HELP_OPTION_DECL},
71 {GETOPT_VERSION_OPTION_DECL},
75 /* Return the group ID of NAME, or -1 if no name was specified. */
78 parse_group (const char *name)
84 struct group *grp = getgrnam (name);
89 unsigned long int tmp;
90 if (! (xstrtoul (name, NULL, 10, &tmp, "") == LONGINT_OK
92 error (EXIT_FAILURE, 0, _("invalid group: %s"), quote (name));
95 endgrent (); /* Save a file descriptor. */
104 if (status != EXIT_SUCCESS)
109 Usage: %s [OPTION]... GROUP FILE...\n\
110 or: %s [OPTION]... --reference=RFILE FILE...\n\
112 program_name, program_name);
114 Change the group of each FILE to GROUP.\n\
115 With --reference, change the group of each FILE to that of RFILE.\n\
119 -c, --changes like verbose but report only when a change is made\n\
120 -f, --silent, --quiet suppress most error messages\n\
121 -v, --verbose output a diagnostic for every file processed\n\
124 --dereference affect the referent of each symbolic link (this is\n\
125 the default), rather than the symbolic link itself\n\
126 -h, --no-dereference affect symbolic links instead of any referenced file\n\
129 (useful only on systems that can change the\n\
130 ownership of a symlink)\n\
133 --no-preserve-root do not treat '/' specially (the default)\n\
134 --preserve-root fail to operate recursively on '/'\n\
137 --reference=RFILE use RFILE's group rather than specifying a\n\
141 -R, --recursive operate on files and directories recursively\n\
145 The following options modify how a hierarchy is traversed when the -R\n\
146 option is also specified. If more than one is specified, only the final\n\
149 -H if a command line argument is a symbolic link\n\
150 to a directory, traverse it\n\
151 -L traverse every symbolic link to a directory\n\
153 -P do not traverse any symbolic links (default)\n\
156 fputs (HELP_OPTION_DESCRIPTION, stdout);
157 fputs (VERSION_OPTION_DESCRIPTION, stdout);
161 %s staff /u Change the group of /u to \"staff\".\n\
162 %s -hR staff /u Change the group of /u and subfiles to \"staff\".\n\
164 program_name, program_name);
165 emit_ancillary_info ();
171 main (int argc, char **argv)
173 bool preserve_root = false;
176 /* Bit flags that control how fts works. */
177 int bit_flags = FTS_PHYSICAL;
179 /* 1 if --dereference, 0 if --no-dereference, -1 if neither has been
181 int dereference = -1;
183 struct Chown_option chopt;
187 initialize_main (&argc, &argv);
188 set_program_name (argv[0]);
189 setlocale (LC_ALL, "");
190 bindtextdomain (PACKAGE, LOCALEDIR);
191 textdomain (PACKAGE);
193 atexit (close_stdout);
197 while ((optc = getopt_long (argc, argv, "HLPRcfhv", long_options, NULL))
202 case 'H': /* Traverse command-line symlinks-to-directories. */
203 bit_flags = FTS_COMFOLLOW | FTS_PHYSICAL;
206 case 'L': /* Traverse all symlinks-to-directories. */
207 bit_flags = FTS_LOGICAL;
210 case 'P': /* Traverse no symlinks-to-directories. */
211 bit_flags = FTS_PHYSICAL;
214 case 'h': /* --no-dereference: affect symlinks */
218 case DEREFERENCE_OPTION: /* --dereference: affect the referent
223 case NO_PRESERVE_ROOT:
224 preserve_root = false;
228 preserve_root = true;
231 case REFERENCE_FILE_OPTION:
232 reference_file = optarg;
236 chopt.recurse = true;
240 chopt.verbosity = V_changes_only;
244 chopt.force_silent = true;
248 chopt.verbosity = V_high;
251 case_GETOPT_HELP_CHAR;
252 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
254 usage (EXIT_FAILURE);
260 if (bit_flags == FTS_PHYSICAL)
262 if (dereference == 1)
263 error (EXIT_FAILURE, 0,
264 _("-R --dereference requires either -H or -L"));
270 bit_flags = FTS_PHYSICAL;
272 chopt.affect_symlink_referent = (dereference != 0);
274 if (argc - optind < (reference_file ? 1 : 2))
277 error (0, 0, _("missing operand"));
279 error (0, 0, _("missing operand after %s"), quote (argv[argc - 1]));
280 usage (EXIT_FAILURE);
285 struct stat ref_stats;
286 if (stat (reference_file, &ref_stats))
287 error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
288 quote (reference_file));
290 gid = ref_stats.st_gid;
291 chopt.group_name = gid_to_name (ref_stats.st_gid);
295 char *group_name = argv[optind++];
296 chopt.group_name = (*group_name ? group_name : NULL);
297 gid = parse_group (group_name);
300 if (chopt.recurse && preserve_root)
302 static struct dev_ino dev_ino_buf;
303 chopt.root_dev_ino = get_root_dev_ino (&dev_ino_buf);
304 if (chopt.root_dev_ino == NULL)
305 error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
309 bit_flags |= FTS_DEFER_STAT;
310 ok = chown_files (argv + optind, bit_flags,
312 (uid_t) -1, (gid_t) -1, &chopt);
316 exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);