src/rm.c

   1 /* 'rm' file deletion utility for GNU.
   2    Copyright (C) 1988-2023 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 3 of the License, or
   7    (at your option) 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, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Initially written by Paul Rubin, David MacKenzie, and Richard Stallman.
  18    Reworked to use chdir and avoid recursion, and later, rewritten
  19    once again, to use fts, by Jim Meyering.  */
  20
  21 #include <config.h>
  22 #include <stdio.h>
  23 #include <getopt.h>
  24 #include <sys/types.h>
  25
  26 #include "system.h"
  27 #include "argmatch.h"
  28 #include "assure.h"
  29 #include "remove.h"
  30 #include "root-dev-ino.h"
  31 #include "yesno.h"
  32 #include "priv-set.h"
  33
  34 /* The official name of this program (e.g., no 'g' prefix).  */
  35 #define PROGRAM_NAME "rm"
  36
  37 #define AUTHORS \
  38   proper_name ("Paul Rubin"), \
  39   proper_name ("David MacKenzie"), \
  40   proper_name ("Richard M. Stallman"), \
  41   proper_name ("Jim Meyering")
  42
  43 /* For long options that have no equivalent short option, use a
  44    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
  45 enum
  46 {
  47   INTERACTIVE_OPTION = CHAR_MAX + 1,
  48   ONE_FILE_SYSTEM,
  49   NO_PRESERVE_ROOT,
  50   PRESERVE_ROOT,
  51   PRESUME_INPUT_TTY_OPTION
  52 };
  53
  54 enum interactive_type
  55   {
  56     interactive_never,          /* 0: no option or --interactive=never */
  57     interactive_once,           /* 1: -I or --interactive=once */
  58     interactive_always          /* 2: default, -i or --interactive=always */
  59   };
  60
  61 static struct option const long_opts[] =
  62 {
  63   {"force", no_argument, nullptr, 'f'},
  64   {"interactive", optional_argument, nullptr, INTERACTIVE_OPTION},
  65
  66   {"one-file-system", no_argument, nullptr, ONE_FILE_SYSTEM},
  67   {"no-preserve-root", no_argument, nullptr, NO_PRESERVE_ROOT},
  68   {"preserve-root", optional_argument, nullptr, PRESERVE_ROOT},
  69
  70   /* This is solely for testing.  Do not document.  */
  71   /* It is relatively difficult to ensure that there is a tty on stdin.
  72      Since rm acts differently depending on that, without this option,
  73      it'd be harder to test the parts of rm that depend on that setting.  */
  74   {"-presume-input-tty", no_argument, nullptr, PRESUME_INPUT_TTY_OPTION},
  75
  76   {"recursive", no_argument, nullptr, 'r'},
  77   {"dir", no_argument, nullptr, 'd'},
  78   {"verbose", no_argument, nullptr, 'v'},
  79   {GETOPT_HELP_OPTION_DECL},
  80   {GETOPT_VERSION_OPTION_DECL},
  81   {nullptr, 0, nullptr, 0}
  82 };
  83
  84 static char const *const interactive_args[] =
  85 {
  86   "never", "no", "none",
  87   "once",
  88   "always", "yes", nullptr
  89 };
  90 static enum interactive_type const interactive_types[] =
  91 {
  92   interactive_never, interactive_never, interactive_never,
  93   interactive_once,
  94   interactive_always, interactive_always
  95 };
  96 ARGMATCH_VERIFY (interactive_args, interactive_types);
  97
  98 /* Advise the user about invalid usages like "rm -foo" if the file
  99    "-foo" exists, assuming ARGC and ARGV are as with 'main'.  */
 100
 101 static void
 102 diagnose_leading_hyphen (int argc, char **argv)
 103 {
 104   /* OPTIND is unreliable, so iterate through the arguments looking
 105      for a file name that looks like an option.  */
 106
 107   for (int i = 1; i < argc; i++)
 108     {
 109       char const *arg = argv[i];
 110       struct stat st;
 111
 112       if (arg[0] == '-' && arg[1] && lstat (arg, &st) == 0)
 113         {
 114           fprintf (stderr,
 115                    _("Try '%s ./%s' to remove the file %s.\n"),
 116                    argv[0],
 117                    quotearg_n_style (1, shell_escape_quoting_style, arg),
 118                    quoteaf (arg));
 119           break;
 120         }
 121     }
 122 }
 123
 124 void
 125 usage (int status)
 126 {
 127   if (status != EXIT_SUCCESS)
 128     emit_try_help ();
 129   else
 130     {
 131       printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name);
 132       fputs (_("\
 133 Remove (unlink) the FILE(s).\n\
 134 \n\
 135   -f, --force           ignore nonexistent files and arguments, never prompt\n\
 136   -i                    prompt before every removal\n\
 137 "), stdout);
 138       fputs (_("\
 139   -I                    prompt once before removing more than three files, or\n\
 140                           when removing recursively; less intrusive than -i,\n\
 141                           while still giving protection against most mistakes\n\
 142       --interactive[=WHEN]  prompt according to WHEN: never, once (-I), or\n\
 143                           always (-i); without WHEN, prompt always\n\
 144 "), stdout);
 145       fputs (_("\
 146       --one-file-system  when removing a hierarchy recursively, skip any\n\
 147                           directory that is on a file system different from\n\
 148                           that of the corresponding command line argument\n\
 149 "), stdout);
 150       fputs (_("\
 151       --no-preserve-root  do not treat '/' specially\n\
 152       --preserve-root[=all]  do not remove '/' (default);\n\
 153                               with 'all', reject any command line argument\n\
 154                               on a separate device from its parent\n\
 155 "), stdout);
 156       fputs (_("\
 157   -r, -R, --recursive   remove directories and their contents recursively\n\
 158   -d, --dir             remove empty directories\n\
 159   -v, --verbose         explain what is being done\n\
 160 "), stdout);
 161       fputs (HELP_OPTION_DESCRIPTION, stdout);
 162       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 163       fputs (_("\
 164 \n\
 165 By default, rm does not remove directories.  Use the --recursive (-r or -R)\n\
 166 option to remove each listed directory, too, along with all of its contents.\n\
 167 "), stdout);
 168       printf (_("\
 169 \n\
 170 To remove a file whose name starts with a '-', for example '-foo',\n\
 171 use one of these commands:\n\
 172   %s -- -foo\n\
 173 \n\
 174   %s ./-foo\n\
 175 "),
 176               program_name, program_name);
 177       fputs (_("\
 178 \n\
 179 Note that if you use rm to remove a file, it might be possible to recover\n\
 180 some of its contents, given sufficient expertise and/or time.  For greater\n\
 181 assurance that the contents are truly unrecoverable, consider using shred(1).\n\
 182 "), stdout);
 183       emit_ancillary_info (PROGRAM_NAME);
 184     }
 185   exit (status);
 186 }
 187
 188 static void
 189 rm_option_init (struct rm_options *x)
 190 {
 191   x->ignore_missing_files = false;
 192   x->interactive = RMI_SOMETIMES;
 193   x->one_file_system = false;
 194   x->remove_empty_directories = false;
 195   x->recursive = false;
 196   x->root_dev_ino = nullptr;
 197   x->preserve_all_root = false;
 198   x->stdin_tty = isatty (STDIN_FILENO);
 199   x->verbose = false;
 200
 201   /* Since this program exits immediately after calling 'rm', rm need not
 202      expend unnecessary effort to preserve the initial working directory.  */
 203   x->require_restore_cwd = false;
 204 }
 205
 206 int
 207 main (int argc, char **argv)
 208 {
 209   bool preserve_root = true;
 210   struct rm_options x;
 211   bool prompt_once = false;
 212   int c;
 213
 214   initialize_main (&argc, &argv);
 215   set_program_name (argv[0]);
 216   setlocale (LC_ALL, "");
 217   bindtextdomain (PACKAGE, LOCALEDIR);
 218   textdomain (PACKAGE);
 219
 220   atexit (close_stdin);
 221
 222   rm_option_init (&x);
 223
 224   /* Try to disable the ability to unlink a directory.  */
 225   priv_set_remove_linkdir ();
 226
 227   while ((c = getopt_long (argc, argv, "dfirvIR", long_opts, nullptr)) != -1)
 228     {
 229       switch (c)
 230         {
 231         case 'd':
 232           x.remove_empty_directories = true;
 233           break;
 234
 235         case 'f':
 236           x.interactive = RMI_NEVER;
 237           x.ignore_missing_files = true;
 238           prompt_once = false;
 239           break;
 240
 241         case 'i':
 242           x.interactive = RMI_ALWAYS;
 243           x.ignore_missing_files = false;
 244           prompt_once = false;
 245           break;
 246
 247         case 'I':
 248           x.interactive = RMI_SOMETIMES;
 249           x.ignore_missing_files = false;
 250           prompt_once = true;
 251           break;
 252
 253         case 'r':
 254         case 'R':
 255           x.recursive = true;
 256           break;
 257
 258         case INTERACTIVE_OPTION:
 259           {
 260             int i;
 261             if (optarg)
 262               i = XARGMATCH ("--interactive", optarg, interactive_args,
 263                              interactive_types);
 264             else
 265               i = interactive_always;
 266             switch (i)
 267               {
 268               case interactive_never:
 269                 x.interactive = RMI_NEVER;
 270                 prompt_once = false;
 271                 break;
 272
 273               case interactive_once:
 274                 x.interactive = RMI_SOMETIMES;
 275                 x.ignore_missing_files = false;
 276                 prompt_once = true;
 277                 break;
 278
 279               case interactive_always:
 280                 x.interactive = RMI_ALWAYS;
 281                 x.ignore_missing_files = false;
 282                 prompt_once = false;
 283                 break;
 284               }
 285             break;
 286           }
 287
 288         case ONE_FILE_SYSTEM:
 289           x.one_file_system = true;
 290           break;
 291
 292         case NO_PRESERVE_ROOT:
 293           if (! STREQ (argv[optind - 1], "--no-preserve-root"))
 294             error (EXIT_FAILURE, 0,
 295                    _("you may not abbreviate the --no-preserve-root option"));
 296           preserve_root = false;
 297           break;
 298
 299         case PRESERVE_ROOT:
 300           if (optarg)
 301             {
 302               if STREQ (optarg, "all")
 303                 x.preserve_all_root = true;
 304               else
 305                 error (EXIT_FAILURE, 0,
 306                        _("unrecognized --preserve-root argument: %s"),
 307                        quoteaf (optarg));
 308             }
 309           preserve_root = true;
 310           break;
 311
 312         case PRESUME_INPUT_TTY_OPTION:
 313           x.stdin_tty = true;
 314           break;
 315
 316         case 'v':
 317           x.verbose = true;
 318           break;
 319
 320         case_GETOPT_HELP_CHAR;
 321         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 322         default:
 323           diagnose_leading_hyphen (argc, argv);
 324           usage (EXIT_FAILURE);
 325         }
 326     }
 327
 328   if (argc <= optind)
 329     {
 330       if (x.ignore_missing_files)
 331         return EXIT_SUCCESS;
 332       else
 333         {
 334           error (0, 0, _("missing operand"));
 335           usage (EXIT_FAILURE);
 336         }
 337     }
 338
 339   if (x.recursive && preserve_root)
 340     {
 341       static struct dev_ino dev_ino_buf;
 342       x.root_dev_ino = get_root_dev_ino (&dev_ino_buf);
 343       if (x.root_dev_ino == nullptr)
 344         error (EXIT_FAILURE, errno, _("failed to get attributes of %s"),
 345                quoteaf ("/"));
 346     }
 347
 348   uintmax_t n_files = argc - optind;
 349   char **file =  argv + optind;
 350
 351   if (prompt_once && (x.recursive || 3 < n_files))
 352     {
 353       fprintf (stderr,
 354                (x.recursive
 355                 ? ngettext ("%s: remove %"PRIuMAX" argument recursively? ",
 356                             "%s: remove %"PRIuMAX" arguments recursively? ",
 357                             select_plural (n_files))
 358                 : ngettext ("%s: remove %"PRIuMAX" argument? ",
 359                             "%s: remove %"PRIuMAX" arguments? ",
 360                             select_plural (n_files))),
 361                program_name, n_files);
 362       if (!yesno ())
 363         return EXIT_SUCCESS;
 364     }
 365
 366   enum RM_status status = rm (file, &x);
 367   affirm (VALID_STATUS (status));
 368   return status == RM_ERROR ? EXIT_FAILURE : EXIT_SUCCESS;
 369 }