src/rm.c

   1 /* `rm' file deletion utility for GNU.
   2    Copyright (C) 88, 90, 91, 1994-2002 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 Paul Rubin, David MacKenzie, and Richard Stallman.
  19    Reworked to use chdir and avoid recursion by Jim Meyering.  */
  20
  21 /* Implementation overview:
  22
  23    In the `usual' case, RM saves no state for directories it is processing.
  24    When a removal fails (either due to an error or to an interactive `no'
  25    reply), the failure is noted (see description of `ht' in remove.c's
  26    remove_cwd_entries function) so that when/if the containing directory
  27    is reopened, RM doesn't try to remove the entry again.
  28
  29    RM may delete arbitrarily deep hierarchies -- even ones in which file
  30    names (from root to leaf) are longer than the system-imposed maximum.
  31    It does this by using chdir to change to each directory in turn before
  32    removing the entries in that directory.
  33
  34    RM detects directory cycles by maintaining a table of the currently
  35    active directories.  See the description of active_dir_map in remove.c.
  36
  37    RM is careful to avoid forming full file names whenever possible.
  38    A full file name is formed only when it is about to be used -- e.g.
  39    in a diagnostic or in an interactive-mode prompt.
  40
  41    RM minimizes the number of lstat system calls it makes.  On systems
  42    that have valid d_type data in directory entries, RM makes only one
  43    lstat call per command line argument -- regardless of the depth of
  44    the hierarchy.  */
  45
  46 #include <config.h>
  47 #include <stdio.h>
  48 #include <getopt.h>
  49 #include <sys/types.h>
  50 #include <assert.h>
  51
  52 #include "system.h"
  53 #include "error.h"
  54 #include "remove.h"
  55 #include "save-cwd.h"
  56
  57 /* The official name of this program (e.g., no `g' prefix).  */
  58 #define PROGRAM_NAME "rm"
  59
  60 #define AUTHORS \
  61   "Paul Rubin, David MacKenzie, Richard Stallman, and Jim Meyering"
  62
  63 /* Name this program was run with.  */
  64 char *program_name;
  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   PRESUME_INPUT_TTY_OPTION = CHAR_MAX + 1
  71 };
  72
  73 static struct option const long_opts[] =
  74 {
  75   {"directory", no_argument, NULL, 'd'},
  76   {"force", no_argument, NULL, 'f'},
  77   {"interactive", no_argument, NULL, 'i'},
  78
  79   /* This is solely for testing.  Do not document.  */
  80   /* It is relatively difficult to ensure that there is a tty on stdin.
  81      Since rm acts differently depending on that, without this option,
  82      it'd be harder to test the parts of rm that depend on that setting.  */
  83   {"presume-input-tty", no_argument, NULL, PRESUME_INPUT_TTY_OPTION},
  84
  85   {"recursive", no_argument, NULL, 'r'},
  86   {"verbose", no_argument, NULL, 'v'},
  87   {GETOPT_HELP_OPTION_DECL},
  88   {GETOPT_VERSION_OPTION_DECL},
  89   {NULL, 0, NULL, 0}
  90 };
  91
  92 void
  93 usage (int status)
  94 {
  95   if (status != 0)
  96     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  97              program_name);
  98   else
  99     {
 100       printf (_("Usage: %s [OPTION]... FILE...\n"), program_name);
 101       fputs (_("\
 102 Remove (unlink) the FILE(s).\n\
 103 \n\
 104   -d, --directory       unlink FILE, even if it is a non-empty directory\n\
 105                           (super-user only)\n\
 106   -f, --force           ignore nonexistent files, never prompt\n\
 107   -i, --interactive     prompt before any removal\n\
 108   -r, -R, --recursive   remove the contents of directories recursively\n\
 109   -v, --verbose         explain what is being done\n\
 110 "), stdout);
 111       fputs (HELP_OPTION_DESCRIPTION, stdout);
 112       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 113       printf (_("\
 114 \n\
 115 To remove a file whose name starts with a `-', for example `-foo',\n\
 116 use one of these commands:\n\
 117   %s -- -foo\n\
 118 \n\
 119   %s ./-foo\n\
 120 "),
 121               program_name, program_name);
 122       fputs (_("\
 123 \n\
 124 Note that if you use rm to remove a file, it is usually possible to recover\n\
 125 the contents of that file.  If you want more assurance that the contents are\n\
 126 truly unrecoverable, consider using shred.\n\
 127 "), stdout);
 128       printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
 129     }
 130   exit (status);
 131 }
 132
 133 static void
 134 rm_option_init (struct rm_options *x)
 135 {
 136   x->unlink_dirs = 0;
 137   x->ignore_missing_files = 0;
 138   x->interactive = 0;
 139   x->recursive = 0;
 140   x->stdin_tty = isatty (STDIN_FILENO);
 141   x->verbose = 0;
 142 }
 143
 144 int
 145 main (int argc, char **argv)
 146 {
 147   struct rm_options x;
 148   int fail = 0;
 149   int c;
 150
 151   program_name = argv[0];
 152   setlocale (LC_ALL, "");
 153   bindtextdomain (PACKAGE, LOCALEDIR);
 154   textdomain (PACKAGE);
 155
 156   atexit (close_stdout);
 157
 158   rm_option_init (&x);
 159
 160   while ((c = getopt_long (argc, argv, "dfirvR", long_opts, NULL)) != -1)
 161     {
 162       switch (c)
 163         {
 164         case 0:         /* Long option.  */
 165           break;
 166         case 'd':
 167           x.unlink_dirs = 1;
 168           break;
 169         case 'f':
 170           x.interactive = 0;
 171           x.ignore_missing_files = 1;
 172           break;
 173         case 'i':
 174           x.interactive = 1;
 175           x.ignore_missing_files = 0;
 176           break;
 177         case 'r':
 178         case 'R':
 179           x.recursive = 1;
 180           break;
 181         case PRESUME_INPUT_TTY_OPTION:
 182           x.stdin_tty = 1;
 183           break;
 184         case 'v':
 185           x.verbose = 1;
 186           break;
 187         case_GETOPT_HELP_CHAR;
 188         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 189         default:
 190           usage (1);
 191         }
 192     }
 193
 194   if (optind == argc)
 195     {
 196       if (x.ignore_missing_files)
 197         exit (0);
 198       else
 199         {
 200           error (0, 0, _("too few arguments"));
 201           usage (1);
 202         }
 203     }
 204
 205   {
 206     size_t n_files = argc - optind;
 207     char const *const *file = (char const *const *) argv + optind;
 208
 209     enum RM_status status = rm (n_files, file, &x);
 210     assert (VALID_STATUS (status));
 211     if (status == RM_ERROR)
 212       fail = 1;
 213   }
 214
 215   exit (fail);
 216 }