src/rmdir.c

   1 /* rmdir -- remove directories
   2
   3    Copyright (C) 1990-2015 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 /* Options:
  19    -p, --parent         Remove any parent dirs that are explicitly mentioned
  20                         in an argument, if they become empty after the
  21                         argument file is removed.
  22
  23    David MacKenzie <djm@ai.mit.edu>  */
  24
  25 #include <config.h>
  26 #include <stdio.h>
  27 #include <getopt.h>
  28 #include <sys/types.h>
  29
  30 #include "system.h"
  31 #include "error.h"
  32 #include "prog-fprintf.h"
  33 #include "quote.h"
  34
  35 /* The official name of this program (e.g., no 'g' prefix).  */
  36 #define PROGRAM_NAME "rmdir"
  37
  38 #define AUTHORS proper_name ("David MacKenzie")
  39
  40 /* If true, remove empty parent directories.  */
  41 static bool remove_empty_parents;
  42
  43 /* If true, don't treat failure to remove a nonempty directory
  44    as an error.  */
  45 static bool ignore_fail_on_non_empty;
  46
  47 /* If true, output a diagnostic for every directory processed.  */
  48 static bool verbose;
  49
  50 /* For long options that have no equivalent short option, use a
  51    non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
  52 enum
  53 {
  54   IGNORE_FAIL_ON_NON_EMPTY_OPTION = CHAR_MAX + 1
  55 };
  56
  57 static struct option const longopts[] =
  58 {
  59   /* Don't name this '--force' because it's not close enough in meaning
  60      to e.g. rm's -f option.  */
  61   {"ignore-fail-on-non-empty", no_argument, NULL,
  62    IGNORE_FAIL_ON_NON_EMPTY_OPTION},
  63
  64   {"path", no_argument, NULL, 'p'},  /* Deprecated.  */
  65   {"parents", no_argument, NULL, 'p'},
  66   {"verbose", no_argument, NULL, 'v'},
  67   {GETOPT_HELP_OPTION_DECL},
  68   {GETOPT_VERSION_OPTION_DECL},
  69   {NULL, 0, NULL, 0}
  70 };
  71
  72 /* Return true if ERROR_NUMBER is one of the values associated
  73    with a failed rmdir due to non-empty target directory.  */
  74 static bool
  75 errno_rmdir_non_empty (int error_number)
  76 {
  77   return error_number == ENOTEMPTY || error_number == EEXIST;
  78 }
  79
  80 /* Return true if when rmdir fails with errno == ERROR_NUMBER
  81    the directory may be empty.  */
  82 static bool
  83 errno_may_be_empty (int error_number)
  84 {
  85   switch (error_number)
  86     {
  87     case EACCES:
  88     case EPERM:
  89     case EROFS:
  90     case EEXIST:
  91     case EBUSY:
  92       return true;
  93     default:
  94       return false;
  95     }
  96 }
  97
  98 /* Return true if an rmdir failure with errno == error_number
  99    for DIR is ignorable.  */
 100 static bool
 101 ignorable_failure (int error_number, char const *dir)
 102 {
 103   return (ignore_fail_on_non_empty
 104           && (errno_rmdir_non_empty (error_number)
 105               || (errno_may_be_empty (error_number)
 106                   && is_empty_dir (AT_FDCWD, dir))));
 107 }
 108
 109 /* Remove any empty parent directories of DIR.
 110    If DIR contains slash characters, at least one of them
 111    (beginning with the rightmost) is replaced with a NUL byte.
 112    Return true if successful.  */
 113
 114 static bool
 115 remove_parents (char *dir)
 116 {
 117   char *slash;
 118   bool ok = true;
 119
 120   strip_trailing_slashes (dir);
 121   while (1)
 122     {
 123       slash = strrchr (dir, '/');
 124       if (slash == NULL)
 125         break;
 126       /* Remove any characters after the slash, skipping any extra
 127          slashes in a row. */
 128       while (slash > dir && *slash == '/')
 129         --slash;
 130       slash[1] = 0;
 131
 132       /* Give a diagnostic for each attempted removal if --verbose.  */
 133       if (verbose)
 134         prog_fprintf (stdout, _("removing directory, %s"), quote (dir));
 135
 136       ok = (rmdir (dir) == 0);
 137
 138       if (!ok)
 139         {
 140           /* Stop quietly if --ignore-fail-on-non-empty. */
 141           if (ignorable_failure (errno, dir))
 142             {
 143               ok = true;
 144             }
 145           else
 146             {
 147               /* Barring race conditions, DIR is expected to be a directory.  */
 148               error (0, errno, _("failed to remove directory %s"),
 149                      quote (dir));
 150             }
 151           break;
 152         }
 153     }
 154   return ok;
 155 }
 156
 157 void
 158 usage (int status)
 159 {
 160   if (status != EXIT_SUCCESS)
 161     emit_try_help ();
 162   else
 163     {
 164       printf (_("Usage: %s [OPTION]... DIRECTORY...\n"), program_name);
 165       fputs (_("\
 166 Remove the DIRECTORY(ies), if they are empty.\n\
 167 \n\
 168       --ignore-fail-on-non-empty\n\
 169                   ignore each failure that is solely because a directory\n\
 170                     is non-empty\n\
 171 "), stdout);
 172       fputs (_("\
 173   -p, --parents   remove DIRECTORY and its ancestors; e.g., 'rmdir -p a/b/c' is\
 174 \n\
 175                     similar to 'rmdir a/b/c a/b a'\n\
 176   -v, --verbose   output a diagnostic for every directory processed\n\
 177 "), stdout);
 178       fputs (HELP_OPTION_DESCRIPTION, stdout);
 179       fputs (VERSION_OPTION_DESCRIPTION, stdout);
 180       emit_ancillary_info (PROGRAM_NAME);
 181     }
 182   exit (status);
 183 }
 184
 185 int
 186 main (int argc, char **argv)
 187 {
 188   bool ok = true;
 189   int optc;
 190
 191   initialize_main (&argc, &argv);
 192   set_program_name (argv[0]);
 193   setlocale (LC_ALL, "");
 194   bindtextdomain (PACKAGE, LOCALEDIR);
 195   textdomain (PACKAGE);
 196
 197   atexit (close_stdout);
 198
 199   remove_empty_parents = false;
 200
 201   while ((optc = getopt_long (argc, argv, "pv", longopts, NULL)) != -1)
 202     {
 203       switch (optc)
 204         {
 205         case 'p':
 206           remove_empty_parents = true;
 207           break;
 208         case IGNORE_FAIL_ON_NON_EMPTY_OPTION:
 209           ignore_fail_on_non_empty = true;
 210           break;
 211         case 'v':
 212           verbose = true;
 213           break;
 214         case_GETOPT_HELP_CHAR;
 215         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 216         default:
 217           usage (EXIT_FAILURE);
 218         }
 219     }
 220
 221   if (optind == argc)
 222     {
 223       error (0, 0, _("missing operand"));
 224       usage (EXIT_FAILURE);
 225     }
 226
 227   for (; optind < argc; ++optind)
 228     {
 229       char *dir = argv[optind];
 230
 231       /* Give a diagnostic for each attempted removal if --verbose.  */
 232       if (verbose)
 233         prog_fprintf (stdout, _("removing directory, %s"), quote (dir));
 234
 235       if (rmdir (dir) != 0)
 236         {
 237           if (ignorable_failure (errno, dir))
 238             continue;
 239
 240           /* Here, the diagnostic is less precise, since we have no idea
 241              whether DIR is a directory.  */
 242           error (0, errno, _("failed to remove %s"), quote (dir));
 243           ok = false;
 244         }
 245       else if (remove_empty_parents)
 246         {
 247           ok &= remove_parents (dir);
 248         }
 249     }
 250
 251   return ok ? EXIT_SUCCESS : EXIT_FAILURE;
 252 }