src/chgrp.c

   1 /* chgrp -- change group ownership of files
   2    Copyright (C) 89, 90, 91, 1995-2002 Free Software Foundation, Inc.
   3
   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)
   7    any later version.
   8
   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.
  13
  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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <grp.h>
  24 #include <getopt.h>
  25
  26 #include "system.h"
  27 #include "error.h"
  28 #include "lchown.h"
  29 #include "group-member.h"
  30 #include "quote.h"
  31 #include "xstrtol.h"
  32 #include "chown-core.h"
  33
  34 /* The official name of this program (e.g., no `g' prefix).  */
  35 #define PROGRAM_NAME "chgrp"
  36
  37 #define AUTHORS "David MacKenzie"
  38
  39 /* MAXUID may come from limits.h *or* sys/params.h (via system.h) above. */
  40 #ifndef MAXUID
  41 # define MAXUID UID_T_MAX
  42 #endif
  43 #ifndef MAXGID
  44 # define MAXGID GID_T_MAX
  45 #endif
  46
  47 #ifndef _POSIX_VERSION
  48 struct group *getgrnam ();
  49 #endif
  50
  51 #if ! HAVE_ENDGRENT
  52 # define endgrent() ((void) 0)
  53 #endif
  54
  55 /* The name the program was run with. */
  56 char *program_name;
  57
  58 /* The argument to the --reference option.  Use the group ID of this file.
  59    This file must exist.  */
  60 static char *reference_file;
  61
  62 /* For long options that have no equivalent short option, use a
  63    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
  64 enum
  65 {
  66   REFERENCE_FILE_OPTION = CHAR_MAX + 1,
  67   DEREFERENCE_OPTION
  68 };
  69
  70 static struct option const long_options[] =
  71 {
  72   {"recursive", no_argument, 0, 'R'},
  73   {"changes", no_argument, 0, 'c'},
  74   {"dereference", no_argument, 0, DEREFERENCE_OPTION},
  75   {"no-dereference", no_argument, 0, 'h'},
  76   {"quiet", no_argument, 0, 'f'},
  77   {"silent", no_argument, 0, 'f'},
  78   {"reference", required_argument, 0, REFERENCE_FILE_OPTION},
  79   {"verbose", no_argument, 0, 'v'},
  80   {GETOPT_HELP_OPTION_DECL},
  81   {GETOPT_VERSION_OPTION_DECL},
  82   {0, 0, 0, 0}
  83 };
  84
  85 /* Set *G according to NAME. */
  86
  87 static void
  88 parse_group (const char *name, gid_t *g)
  89 {
  90   struct group *grp;
  91
  92   if (*name == '\0')
  93     error (EXIT_FAILURE, 0, _("cannot change to null group"));
  94
  95   grp = getgrnam (name);
  96   if (grp == NULL)
  97     {
  98       strtol_error s_err;
  99       unsigned long int tmp_long;
 100
 101       if (!ISDIGIT (*name))
 102         error (EXIT_FAILURE, 0, _("invalid group name %s"), quote (name));
 103
 104       s_err = xstrtoul (name, NULL, 0, &tmp_long, NULL);
 105       if (s_err != LONGINT_OK)
 106         STRTOL_FATAL_ERROR (name, _("group number"), s_err);
 107
 108       if (tmp_long > MAXGID)
 109         error (EXIT_FAILURE, 0, _("invalid group number %s"), quote (name));
 110
 111       *g = tmp_long;
 112     }
 113   else
 114     *g = grp->gr_gid;
 115   endgrent ();          /* Save a file descriptor. */
 116 }
 117
 118 void
 119 usage (int status)
 120 {
 121   if (status != 0)
 122     fprintf (stderr, _("Try `%s --help' for more information.\n"),
 123              program_name);
 124   else
 125     {
 126       printf (_("\
 127 Usage: %s [OPTION]... GROUP FILE...\n\
 128   or:  %s [OPTION]... --reference=RFILE FILE...\n\
 129 "),
 130               program_name, program_name);
 131       fputs (_("\
 132 Change the group membership of each FILE to GROUP.\n\
 133 \n\
 134   -c, --changes          like verbose but report only when a change is made\n\
 135       --dereference      affect the referent of each symbolic link, rather\n\
 136                          than the symbolic link itself\n\
 137 "), stdout);
 138       fputs (_("\
 139   -h, --no-dereference   affect symbolic links instead of any referenced file\n\
 140                          (available only on systems that can change the\n\
 141                          ownership of a symlink)\n\
 142 "), stdout);
 143       fputs (_("\
 144   -f, --silent, --quiet  suppress most error messages\n\
 145       --reference=RFILE  use RFILE's group rather than the specified\n\
 146                          GROUP value\n\
 147   -R, --recursive        operate on files and directories recursively\n\
 148   -v, --verbose          output a diagnostic for every file processed\n\
 149 "), stdout);
 150       fputs (HELP_OPTION_DESCRIPTION, stdout);
 151       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 152       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 153     }
 154   exit (status);
 155 }
 156
 157 int
 158 main (int argc, char **argv)
 159 {
 160   gid_t gid;
 161   int errors = 0;
 162   int optc;
 163   struct Chown_option chopt;
 164
 165   program_name = argv[0];
 166   setlocale (LC_ALL, "");
 167   bindtextdomain (PACKAGE, LOCALEDIR);
 168   textdomain (PACKAGE);
 169
 170   atexit (close_stdout);
 171
 172   chopt_init (&chopt);
 173
 174   while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1)
 175     {
 176       switch (optc)
 177         {
 178         case 0:
 179           break;
 180         case REFERENCE_FILE_OPTION:
 181           reference_file = optarg;
 182           break;
 183         case DEREFERENCE_OPTION:
 184           chopt.dereference = DEREF_ALWAYS;
 185           break;
 186         case 'R':
 187           chopt.recurse = 1;
 188           break;
 189         case 'c':
 190           chopt.verbosity = V_changes_only;
 191           break;
 192         case 'f':
 193           chopt.force_silent = 1;
 194           break;
 195         case 'h':
 196           chopt.dereference = DEREF_NEVER;
 197           break;
 198         case 'v':
 199           chopt.verbosity = V_high;
 200           break;
 201         case_GETOPT_HELP_CHAR;
 202         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 203         default:
 204           usage (EXIT_FAILURE);
 205         }
 206     }
 207
 208   if (argc - optind + (reference_file ? 1 : 0) <= 1)
 209     {
 210       error (0, 0, _("too few arguments"));
 211       usage (EXIT_FAILURE);
 212     }
 213
 214   if (reference_file)
 215     {
 216       struct stat ref_stats;
 217       if (stat (reference_file, &ref_stats))
 218         error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
 219                quote (reference_file));
 220
 221       chopt.group_name = gid_to_name (ref_stats.st_gid);
 222       gid = ref_stats.st_gid;
 223     }
 224   else
 225     {
 226       chopt.group_name = argv[optind++];
 227       parse_group (chopt.group_name, &gid);
 228     }
 229
 230   for (; optind < argc; ++optind)
 231     errors |= change_file_owner (1, argv[optind], (uid_t) -1, gid,
 232                                  (uid_t) -1, (gid_t) -1, &chopt);
 233
 234   chopt_free (&chopt);
 235
 236   exit (errors);
 237 }