summaryrefslogtreecommitdiff
path: root/src/rmdir.c
blob: 90a80a602ab1b922020415f1faa90fe50541ade7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* rmdir -- remove directories

   Copyright (C) 1990-1991, 1995-2002, 2004-2010 Free Software Foundation, Inc.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* Options:
   -p, --parent		Remove any parent dirs that are explicitly mentioned
                        in an argument, if they become empty after the
                        argument file is removed.

   David MacKenzie <djm@ai.mit.edu>  */

#include <config.h>
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>

#include "system.h"
#include "error.h"
#include "prog-fprintf.h"
#include "quote.h"

/* The official name of this program (e.g., no `g' prefix).  */
#define PROGRAM_NAME "rmdir"

#define AUTHORS proper_name ("David MacKenzie")

/* If true, remove empty parent directories.  */
static bool remove_empty_parents;

/* If true, don't treat failure to remove a nonempty directory
   as an error.  */
static bool ignore_fail_on_non_empty;

/* If true, output a diagnostic for every directory processed.  */
static bool verbose;

/* For long options that have no equivalent short option, use a
   non-character as a pseudo short option, starting with CHAR_MAX + 1.  */
enum
{
  IGNORE_FAIL_ON_NON_EMPTY_OPTION = CHAR_MAX + 1
};

static struct option const longopts[] =
{
  /* Don't name this `--force' because it's not close enough in meaning
     to e.g. rm's -f option.  */
  {"ignore-fail-on-non-empty", no_argument, NULL,
   IGNORE_FAIL_ON_NON_EMPTY_OPTION},

  {"path", no_argument, NULL, 'p'},  /* Deprecated.  */
  {"parents", no_argument, NULL, 'p'},
  {"verbose", no_argument, NULL, 'v'},
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {NULL, 0, NULL, 0}
};

/* Return true if ERROR_NUMBER is one of the values associated
   with a failed rmdir due to non-empty target directory.  */
static bool
errno_rmdir_non_empty (int error_number)
{
  return error_number == ENOTEMPTY || error_number == EEXIST;
}

/* Return true if when rmdir fails with errno == ERROR_NUMBER
   the directory may be empty.  */
static bool
errno_may_be_empty (int error_number)
{
  switch (error_number)
    {
    case EACCES:
    case EPERM:
    case EROFS:
    case EEXIST:
    case EBUSY:
      return true;
    default:
      return false;
    }
}

/* Return true if an rmdir failure with errno == error_number
   for DIR is ignorable.  */
static bool
ignorable_failure (int error_number, char const *dir)
{
  return (ignore_fail_on_non_empty
          && (errno_rmdir_non_empty (error_number)
              || (errno_may_be_empty (error_number)
                  && is_empty_dir (AT_FDCWD, dir))));
}

/* Remove any empty parent directories of DIR.
   If DIR contains slash characters, at least one of them
   (beginning with the rightmost) is replaced with a NUL byte.
   Return true if successful.  */

static bool
remove_parents (char *dir)
{
  char *slash;
  bool ok = true;

  strip_trailing_slashes (dir);
  while (1)
    {
      slash = strrchr (dir, '/');
      if (slash == NULL)
        break;
      /* Remove any characters after the slash, skipping any extra
         slashes in a row. */
      while (slash > dir && *slash == '/')
        --slash;
      slash[1] = 0;

      /* Give a diagnostic for each attempted removal if --verbose.  */
      if (verbose)
        prog_fprintf (stdout, _("removing directory, %s"), quote (dir));

      ok = (rmdir (dir) == 0);

      if (!ok)
        {
          /* Stop quietly if --ignore-fail-on-non-empty. */
          if (ignorable_failure (errno, dir))
            {
              ok = true;
            }
          else
            {
              /* Barring race conditions, DIR is expected to be a directory.  */
              error (0, errno, _("failed to remove directory %s"),
                     quote (dir));
            }
          break;
        }
    }
  return ok;
}

void
usage (int status)
{
  if (status != EXIT_SUCCESS)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
             program_name);
  else
    {
      printf (_("Usage: %s [OPTION]... DIRECTORY...\n"), program_name);
      fputs (_("\
Remove the DIRECTORY(ies), if they are empty.\n\
\n\
      --ignore-fail-on-non-empty\n\
                  ignore each failure that is solely because a directory\n\
                    is non-empty\n\
"), stdout);
      fputs (_("\
  -p, --parents   remove DIRECTORY and its ancestors; e.g., `rmdir -p a/b/c' is\n\
                    similar to `rmdir a/b/c a/b a'\n\
  -v, --verbose   output a diagnostic for every directory processed\n\
"), stdout);
      fputs (HELP_OPTION_DESCRIPTION, stdout);
      fputs (VERSION_OPTION_DESCRIPTION, stdout);
      emit_ancillary_info ();
    }
  exit (status);
}

int
main (int argc, char **argv)
{
  bool ok = true;
  int optc;

  initialize_main (&argc, &argv);
  set_program_name (argv[0]);
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  atexit (close_stdout);

  remove_empty_parents = false;

  while ((optc = getopt_long (argc, argv, "pv", longopts, NULL)) != -1)
    {
      switch (optc)
        {
        case 'p':
          remove_empty_parents = true;
          break;
        case IGNORE_FAIL_ON_NON_EMPTY_OPTION:
          ignore_fail_on_non_empty = true;
          break;
        case 'v':
          verbose = true;
          break;
        case_GETOPT_HELP_CHAR;
        case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
        default:
          usage (EXIT_FAILURE);
        }
    }

  if (optind == argc)
    {
      error (0, 0, _("missing operand"));
      usage (EXIT_FAILURE);
    }

  for (; optind < argc; ++optind)
    {
      char *dir = argv[optind];

      /* Give a diagnostic for each attempted removal if --verbose.  */
      if (verbose)
        prog_fprintf (stdout, _("removing directory, %s"), quote (dir));

      if (rmdir (dir) != 0)
        {
          if (ignorable_failure (errno, dir))
            continue;

          /* Here, the diagnostic is less precise, since we have no idea
             whether DIR is a directory.  */
          error (0, errno, _("failed to remove %s"), quote (dir));
          ok = false;
        }
      else if (remove_empty_parents)
        {
          ok &= remove_parents (dir);
        }
    }

  exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}