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 "chown-core.h"
  41
  42 /* The official name of this program (e.g., no `g' prefix).  */
  43 #define PROGRAM_NAME "chown"
  44
  45 #define AUTHORS "David MacKenzie"
  46
  47 #ifndef _POSIX_VERSION
  48 struct passwd *getpwnam ();
  49 struct group *getgrnam ();
  50 struct group *getgrgid ();
  51 #endif
  52
  53 #if ! HAVE_ENDPWENT
  54 # define endpwent() ((void) 0)
  55 #endif
  56
  57 char *parse_user_spec ();
  58
  59 /* The name the program was run with. */
  60 char *program_name;
  61
  62 /* The argument to the --reference option.  Use the owner and group IDs
  63    of this file.  This file must exist.  */
  64 static char *reference_file;
  65
  66 /* For long options that have no equivalent short option, use a
  67    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
  68 enum
  69 {
  70   REFERENCE_FILE_OPTION = CHAR_MAX + 1,
  71   DEREFERENCE_OPTION,
  72   FROM_OPTION
  73 };
  74
  75 static struct option const long_options[] =
  76 {
  77   {"recursive", no_argument, 0, 'R'},
  78   {"changes", no_argument, 0, 'c'},
  79   {"dereference", no_argument, 0, DEREFERENCE_OPTION},
  80   {"from", required_argument, 0, FROM_OPTION},
  81   {"no-dereference", no_argument, 0, 'h'},
  82   {"quiet", no_argument, 0, 'f'},
  83   {"silent", no_argument, 0, 'f'},
  84   {"reference", required_argument, 0, REFERENCE_FILE_OPTION},
  85   {"verbose", no_argument, 0, 'v'},
  86   {GETOPT_HELP_OPTION_DECL},
  87   {GETOPT_VERSION_OPTION_DECL},
  88   {0, 0, 0, 0}
  89 };
  90
  91 void
  92 usage (int status)
  93 {
  94   if (status != 0)
  95     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  96              program_name);
  97   else
  98     {
  99       printf (_("\
 100 Usage: %s [OPTION]... OWNER[:[GROUP]] FILE...\n\
 101   or:  %s [OPTION]... :GROUP FILE...\n\
 102   or:  %s [OPTION]... --reference=RFILE FILE...\n\
 103 "),
 104               program_name, program_name, program_name);
 105       fputs (_("\
 106 Change the owner and/or group of each FILE to OWNER and/or GROUP.\n\
 107 \n\
 108   -c, --changes          like verbose but report only when a change is made\n\
 109       --dereference      affect the referent of each symbolic link, rather\n\
 110                          than the symbolic link itself\n\
 111 "), stdout);
 112       fputs (_("\
 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 "), stdout);
 117       fputs (_("\
 118       --from=CURRENT_OWNER:CURRENT_GROUP\n\
 119                          change the owner and/or group of each file only if\n\
 120                          its current owner and/or group match those specified\n\
 121                          here.  Either may be omitted, in which case a match\n\
 122                          is not required for the omitted attribute.\n\
 123 "), stdout);
 124       fputs (_("\
 125   -f, --silent, --quiet  suppress most error messages\n\
 126       --reference=RFILE  use RFILE's owner and group rather than\n\
 127                          the specified OWNER:GROUP values\n\
 128   -R, --recursive        operate on files and directories recursively\n\
 129   -v, --verbose          output a diagnostic for every file processed\n\
 130 "), stdout);
 131       fputs (HELP_OPTION_DESCRIPTION, stdout);
 132       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 133       fputs (_("\
 134 \n\
 135 Owner is unchanged if missing.  Group is unchanged if missing, but changed\n\
 136 to login group if implied by a `:'.  OWNER and GROUP may be numeric as well\n\
 137 as symbolic.\n\
 138 "), stdout);
 139       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 140     }
 141   exit (status);
 142 }
 143
 144 int
 145 main (int argc, char **argv)
 146 {
 147   uid_t uid = (uid_t) -1;       /* New uid; -1 if not to be changed. */
 148   gid_t gid = (uid_t) -1;       /* New gid; -1 if not to be changed. */
 149   uid_t old_uid = (uid_t) -1;   /* Old uid; -1 if unrestricted. */
 150   gid_t old_gid = (uid_t) -1;   /* Old gid; -1 if unrestricted. */
 151   struct Chown_option chopt;
 152
 153   int errors = 0;
 154   int optc;
 155
 156   program_name = argv[0];
 157   setlocale (LC_ALL, "");
 158   bindtextdomain (PACKAGE, LOCALEDIR);
 159   textdomain (PACKAGE);
 160
 161   atexit (close_stdout);
 162
 163   chopt_init (&chopt);
 164
 165   while ((optc = getopt_long (argc, argv, "Rcfhv", long_options, NULL)) != -1)
 166     {
 167       switch (optc)
 168         {
 169         case 0:
 170           break;
 171         case REFERENCE_FILE_OPTION:
 172           reference_file = optarg;
 173           break;
 174         case DEREFERENCE_OPTION:
 175           chopt.dereference = DEREF_ALWAYS;
 176           break;
 177         case FROM_OPTION:
 178           {
 179             char *u_dummy, *g_dummy;
 180             const char *e = parse_user_spec (optarg,
 181                                              &old_uid, &old_gid,
 182                                              &u_dummy, &g_dummy);
 183             if (e)
 184               error (1, 0, "%s: %s", quote (optarg), e);
 185             break;
 186           }
 187         case 'R':
 188           chopt.recurse = 1;
 189           break;
 190         case 'c':
 191           chopt.verbosity = V_changes_only;
 192           break;
 193         case 'f':
 194           chopt.force_silent = 1;
 195           break;
 196         case 'h':
 197           chopt.dereference = DEREF_NEVER;
 198           break;
 199         case 'v':
 200           chopt.verbosity = V_high;
 201           break;
 202         case_GETOPT_HELP_CHAR;
 203         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 204         default:
 205           usage (1);
 206         }
 207     }
 208
 209   if (argc - optind + (reference_file ? 1 : 0) <= 1)
 210     {
 211       error (0, 0, _("too few arguments"));
 212       usage (1);
 213     }
 214
 215   if (reference_file)
 216     {
 217       struct stat ref_stats;
 218
 219       if (stat (reference_file, &ref_stats))
 220         error (1, errno, _("failed to get attributes of %s"),
 221                quote (reference_file));
 222
 223       uid = ref_stats.st_uid;
 224       gid = ref_stats.st_gid;
 225       chopt.user_name = uid_to_name (ref_stats.st_uid);
 226       chopt.group_name = gid_to_name (ref_stats.st_gid);
 227     }
 228   else
 229     {
 230       const char *e = parse_user_spec (argv[optind], &uid, &gid,
 231                                        &chopt.user_name, &chopt.group_name);
 232       if (e)
 233         error (1, 0, "%s: %s", quote (argv[optind]), e);
 234
 235       /* FIXME: set it to the empty string?  */
 236       if (chopt.user_name == NULL)
 237         chopt.user_name = "";
 238
 239       optind++;
 240     }
 241
 242   for (; optind < argc; ++optind)
 243     errors |= change_file_owner (1, argv[optind], uid, gid,
 244                                  old_uid, old_gid, &chopt);
 245
 246   chopt_free (&chopt);
 247
 248   exit (errors);
 249 }