1 /* chgrp -- change group ownership of files
2 Copyright (C) 89, 90, 91, 1995-2005 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 2, or (at your option)
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, write to the Free Software Foundation,
16 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
22 #include <sys/types.h>
27 #include "chown-core.h"
30 #include "group-member.h"
35 /* The official name of this program (e.g., no `g' prefix). */
36 #define PROGRAM_NAME "chgrp"
38 #define AUTHORS "David MacKenzie", "Jim Meyering"
41 # define endgrent() ((void) 0)
44 /* The name the program was run with. */
47 /* The argument to the --reference option. Use the group ID of this file.
48 This file must exist. */
49 static char *reference_file;
51 /* For long options that have no equivalent short option, use a
52 non-character as a pseudo short option, starting with CHAR_MAX + 1. */
55 DEREFERENCE_OPTION = CHAR_MAX + 1,
59 static struct option const long_options[] =
61 {"recursive", no_argument, NULL, 'R'},
62 {"changes", no_argument, NULL, 'c'},
63 {"dereference", no_argument, NULL, DEREFERENCE_OPTION},
64 {"no-dereference", no_argument, NULL, 'h'},
65 {"quiet", no_argument, NULL, 'f'},
66 {"silent", no_argument, NULL, 'f'},
67 {"reference", required_argument, NULL, REFERENCE_FILE_OPTION},
68 {"verbose", no_argument, NULL, 'v'},
69 {GETOPT_HELP_OPTION_DECL},
70 {GETOPT_VERSION_OPTION_DECL},
74 /* Return the group ID of NAME, or -1 if no name was specified. */
77 parse_group (const char *name)
83 struct group *grp = getgrnam (name);
88 unsigned long int tmp;
89 if (! (xstrtoul (name, NULL, 10, &tmp, "") == LONGINT_OK
91 error (EXIT_FAILURE, 0, _("invalid group %s"), quote (name));
94 endgrent (); /* Save a file descriptor. */
103 if (status != EXIT_SUCCESS)
104 fprintf (stderr, _("Try `%s --help' for more information.\n"),
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\
117 -c, --changes like verbose but report only when a change is made\n\
118 --dereference affect the referent of each symbolic link, rather\n\
119 than the symbolic link itself (this is the default)\n\
122 -h, --no-dereference affect each symbolic link instead of any referenced\n\
123 file (useful only on systems that can change the\n\
124 ownership of a symlink)\n\
127 --no-preserve-root do not treat `/' specially (the default)\n\
128 --preserve-root fail to operate recursively on `/'\n\
131 -f, --silent, --quiet suppress most error messages\n\
132 --reference=RFILE use RFILE's group rather than the specifying\n\
134 -R, --recursive operate on files and directories recursively\n\
135 -v, --verbose output a diagnostic for every file processed\n\
139 The following options modify how a hierarchy is traversed when the -R\n\
140 option is also specified. If more than one is specified, only the final\n\
143 -H if a command line argument is a symbolic link\n\
144 to a directory, traverse it\n\
145 -L traverse every symbolic link to a directory\n\
147 -P do not traverse any symbolic links (default)\n\
150 fputs (HELP_OPTION_DESCRIPTION, stdout);
151 fputs (VERSION_OPTION_DESCRIPTION, stdout);
155 %s staff /u Change the group of /u to \"staff\".\n\
156 %s -hR staff /u Change the group of /u and subfiles to \"staff\".\n\
158 program_name, program_name);
159 printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
165 main (int argc, char **argv)
169 /* Bit flags that control how fts works. */
170 int bit_flags = FTS_PHYSICAL;
172 /* 1 if --dereference, 0 if --no-dereference, -1 if neither has been
174 int dereference = -1;
176 struct Chown_option chopt;
180 initialize_main (&argc, &argv);
181 program_name = argv[0];
182 setlocale (LC_ALL, "");
183 bindtextdomain (PACKAGE, LOCALEDIR);
184 textdomain (PACKAGE);
186 atexit (close_stdout);
190 while ((optc = getopt_long (argc, argv, "HLPRcfhv", long_options, NULL))
195 case 'H': /* Traverse command-line symlinks-to-directories. */
196 bit_flags = FTS_COMFOLLOW | FTS_PHYSICAL;
199 case 'L': /* Traverse all symlinks-to-directories. */
200 bit_flags = FTS_LOGICAL;
203 case 'P': /* Traverse no symlinks-to-directories. */
204 bit_flags = FTS_PHYSICAL;
207 case 'h': /* --no-dereference: affect symlinks */
211 case DEREFERENCE_OPTION: /* --dereference: affect the referent
216 case REFERENCE_FILE_OPTION:
217 reference_file = optarg;
221 chopt.recurse = true;
225 chopt.verbosity = V_changes_only;
229 chopt.force_silent = true;
233 chopt.verbosity = V_high;
236 case_GETOPT_HELP_CHAR;
237 case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
239 usage (EXIT_FAILURE);
245 if (bit_flags == FTS_PHYSICAL)
247 if (dereference == 1)
248 error (EXIT_FAILURE, 0,
249 _("-R --dereference requires either -H or -L"));
250 chopt.affect_symlink_referent = false;
254 if (dereference == 0)
255 error (EXIT_FAILURE, 0, _("-R -h requires -P"));
256 chopt.affect_symlink_referent = true;
261 bit_flags = FTS_PHYSICAL;
262 chopt.affect_symlink_referent = (dereference != 0);
265 if (argc - optind < (reference_file ? 1 : 2))
268 error (0, 0, _("missing operand"));
270 error (0, 0, _("missing operand after %s"), quote (argv[argc - 1]));
271 usage (EXIT_FAILURE);
276 struct stat ref_stats;
277 if (stat (reference_file, &ref_stats))
278 error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
279 quote (reference_file));
281 gid = ref_stats.st_gid;
282 chopt.group_name = gid_to_name (ref_stats.st_gid);
286 char *group_name = argv[optind++];
287 chopt.group_name = (*group_name ? group_name : NULL);
288 gid = parse_group (group_name);
291 ok = chown_files (argv + optind, bit_flags,
293 (uid_t) -1, (gid_t) -1, &chopt);
297 exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);