src/chown.c

   1 /* chown -- change user and group ownership of files
   2    Copyright (C) 89, 90, 91, 1995-2001 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 /*
  19               |                       user
  20               | unchanged                 explicit
  21  -------------|-------------------------+-------------------------|
  22  g unchanged  | ---                     | chown u                 |
  23  r            |-------------------------+-------------------------|
  24  o explicit   | chgrp g or chown .g     | chown u.g               |
  25  u            |-------------------------+-------------------------|
  26  p from passwd| ---                     | chown u.                |
  27               |-------------------------+-------------------------|
  28
  29    Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
  30
  31 #include <config.h>
  32 #include <stdio.h>
  33 #include <sys/types.h>
  34 #include <getopt.h>
  35
  36 #include "system.h"
  37 #include "error.h"
  38 #include "lchown.h"
  39 #include "quote.h"
  40 #include "savedir.h"
  41 #include "chown-core.h"
  42
  43 /* The official name of this program (e.g., no `g' prefix).  */
  44 #define PROGRAM_NAME "chown"
  45
  46 #define AUTHORS "David MacKenzie"
  47
  48 #ifndef _POSIX_VERSION
  49 struct passwd *getpwnam ();
  50 struct group *getgrnam ();
  51 struct group *getgrgid ();
  52 #endif
  53
  54 #if ! HAVE_ENDPWENT
  55 # define endpwent() ((void) 0)
  56 #endif
  57
  58 char *parse_user_spec ();
  59 void strip_trailing_slashes ();
  60
  61 /* The name the program was run with. */
  62 char *program_name;
  63
  64 /* The argument to the --reference option.  Use the owner and group IDs
  65    of this file.  This file must exist.  */
  66 static char *reference_file;
  67
  68 /* For long options that have no equivalent short option, use a
  69    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
  70 enum
  71 {
  72   REFERENCE_FILE_OPTION = CHAR_MAX + 1,
  73   DEREFERENCE_OPTION,
  74   FROM_OPTION
  75 };
  76
  77 static struct option const long_options[] =
  78 {
  79   {"recursive", no_argument, 0, 'R'},
  80   {"changes", no_argument, 0, 'c'},
  81   {"dereference", no_argument, 0, DEREFERENCE_OPTION},
  82   {"from", required_argument, 0, FROM_OPTION},
  83   {"no-dereference", no_argument, 0, 'h'},
  84   {"quiet", no_argument, 0, 'f'},
  85   {"silent", no_argument, 0, 'f'},
  86   {"reference", required_argument, 0, REFERENCE_FILE_OPTION},
  87   {"verbose", no_argument, 0, 'v'},
  88   {GETOPT_HELP_OPTION_DECL},
  89   {GETOPT_VERSION_OPTION_DECL},
  90   {0, 0, 0, 0}
  91 };
  92
  93 void
  94 usage (int status)
  95 {
  96   if (status != 0)
  97     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  98              program_name);
  99   else
 100     {
 101       printf (_("\
 102 Usage: %s [OPTION]... OWNER[:[GROUP]] FILE...\n\
 103   or:  %s [OPTION]... :GROUP FILE...\n\
 104   or:  %s [OPTION]... --reference=RFILE FILE...\n\
 105 "),
 106               program_name, program_name, program_name);
 107       printf (_("\
 108 Change the owner and/or group of each FILE to OWNER and/or GROUP.\n\
 109 \n\
 110   -c, --changes          like verbose but report only when a change is made\n\
 111       --dereference      affect the referent of each symbolic link, rather\n\
 112                          than the symbolic link itself\n\
 113   -h, --no-dereference   affect symbolic links instead of any referenced file\n\
 114                          (available only on systems that can change the\n\
 115                          ownership of a symlink)\n\
 116       --from=CURRENT_OWNER:CURRENT_GROUP\n\
 117                          change the owner and/or group of each file only if\n\
 118                          its current owner and/or group match those specified\n\
 119                          here.  Either may be omitted, in which case a match\n\
 120                          is not required for the omitted attribute.\n\
 121   -f, --silent, --quiet  suppress most error messages\n\
 122       --reference=RFILE  use RFILE's owner and group rather than\n\
 123                          the specified OWNER:GROUP values\n\
 124   -R, --recursive        operate on files and directories recursively\n\
 125   -v, --verbose          output a diagnostic for every file processed\n\
 126       --help             display this help and exit\n\
 127       --version          output version information and exit\n\
 128 \n\
 129 "));
 130       printf (_("\
 131 Owner is unchanged if missing.  Group is unchanged if missing, but changed\n\
 132 to login group if implied by a `:'.  OWNER and GROUP may be numeric as well\n\
 133 as symbolic.\n\
 134 "));
 135       puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
 136     }
 137   exit (status);
 138 }
 139
 140 int
 141 main (int argc, char **argv)
 142 {
 143   uid_t uid = (uid_t) -1;       /* New uid; -1 if not to be changed. */
 144   gid_t gid = (uid_t) -1;       /* New gid; -1 if not to be changed. */
 145   uid_t old_uid = (uid_t) -1;   /* Old uid; -1 if unrestricted. */
 146   gid_t old_gid = (uid_t) -1;   /* Old gid; -1 if unrestricted. */
 147   struct Chown_option chopt;
 148
 149   int errors = 0;
 150   int optc;
 151
 152   program_name = argv[0];
 153   setlocale (LC_ALL, "");
 154   bindtextdomain (PACKAGE, LOCALEDIR);
 155   textdomain (PACKAGE);
 156
 157   atexit (close_stdout);
 158
 159   chopt_init (&chopt);
 160
 161   while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1)
 162     {
 163       switch (optc)
 164         {
 165         case 0:
 166           break;
 167         case REFERENCE_FILE_OPTION:
 168           reference_file = optarg;
 169           break;
 170         case DEREFERENCE_OPTION:
 171           chopt.dereference = DEREF_ALWAYS;
 172           break;
 173         case FROM_OPTION:
 174           {
 175             char *u_dummy, *g_dummy;
 176             const char *e = parse_user_spec (argv[optind],
 177                                              &old_uid, &old_gid,
 178                                              &u_dummy, &g_dummy);
 179             if (e)
 180               error (1, 0, "%s: %s", quote (argv[optind]), e);
 181             break;
 182           }
 183         case 'R':
 184           chopt.recurse = 1;
 185           break;
 186         case 'c':
 187           chopt.verbosity = V_changes_only;
 188           break;
 189         case 'f':
 190           chopt.force_silent = 1;
 191           break;
 192         case 'h':
 193           chopt.dereference = DEREF_NEVER;
 194           break;
 195         case 'v':
 196           chopt.verbosity = V_high;
 197           break;
 198         case_GETOPT_HELP_CHAR;
 199         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 200         default:
 201           usage (1);
 202         }
 203     }
 204
 205   if (argc - optind + (reference_file ? 1 : 0) <= 1)
 206     {
 207       error (0, 0, _("too few arguments"));
 208       usage (1);
 209     }
 210
 211   if (reference_file)
 212     {
 213       struct stat ref_stats;
 214
 215       if (stat (reference_file, &ref_stats))
 216         error (1, errno, _("getting attributes of %s"), quote (reference_file));
 217
 218       uid = ref_stats.st_uid;
 219       gid = ref_stats.st_gid;
 220       chopt.user_name = uid_to_name (ref_stats.st_uid);
 221       chopt.group_name = gid_to_name (ref_stats.st_gid);
 222     }
 223   else
 224     {
 225       const char *e = parse_user_spec (argv[optind], &uid, &gid,
 226                                        &chopt.user_name, &chopt.group_name);
 227       if (e)
 228         error (1, 0, "%s: %s", quote (argv[optind]), e);
 229
 230       /* FIXME: set it to the empty string?  */
 231       if (chopt.user_name == NULL)
 232         chopt.user_name = "";
 233
 234       optind++;
 235     }
 236
 237   for (; optind < argc; ++optind)
 238     {
 239       strip_trailing_slashes (argv[optind]);
 240       errors |= change_file_owner (1, argv[optind], uid, gid,
 241                                    old_uid, old_gid, &chopt);
 242     }
 243
 244   chopt_free (&chopt);
 245
 246   exit (errors);
 247 }