summaryrefslogtreecommitdiff
path: root/src/mv.c
blob: 35154abc182e730c2797edaa1f957c6131ff82dc (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
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
/* mv -- move or rename files
   Copyright (C) 86, 89, 90, 91, 1995-2001 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 2, 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, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

/* Written by Mike Parker, David MacKenzie, and Jim Meyering */

#ifdef _AIX
 #pragma alloca
#endif

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

#include "system.h"
#include "backupfile.h"
#include "copy.h"
#include "cp-hash.h"
#include "dirname.h"
#include "error.h"
#include "path-concat.h"
#include "quote.h"
#include "remove.h"

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

#define AUTHORS "Mike Parker, David MacKenzie, and Jim Meyering"

/* Initial number of entries in each hash table entry's table of inodes.  */
#define INITIAL_HASH_MODULE 100

/* Initial number of entries in the inode hash table.  */
#define INITIAL_ENTRY_TAB_SIZE 70

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

int euidaccess ();
int full_write ();
int isdir ();
int lstat ();
int yesno ();

/* The name this program was run with. */
char *program_name;

/* Remove any trailing slashes from each SOURCE argument.  */
static int remove_trailing_slashes;

static struct option const long_options[] =
{
  {"backup", optional_argument, NULL, 'b'},
  {"force", no_argument, NULL, 'f'},
  {"interactive", no_argument, NULL, 'i'},
  {"strip-trailing-slashes", no_argument, NULL, STRIP_TRAILING_SLASHES_OPTION},
  {"suffix", required_argument, NULL, 'S'},
  {"target-directory", required_argument, NULL, TARGET_DIRECTORY_OPTION},
  {"update", no_argument, NULL, 'u'},
  {"verbose", no_argument, NULL, 'v'},
  {"version-control", required_argument, NULL, 'V'},
  {GETOPT_HELP_OPTION_DECL},
  {GETOPT_VERSION_OPTION_DECL},
  {NULL, 0, NULL, 0}
};

static void
rm_option_init (struct rm_options *x)
{
  x->unlink_dirs = 0;

  x->ignore_missing_files = 0;

  x->recursive = 1;

  /* Should we prompt for removal, too?  No.  Prompting for the `move'
     part is enough.  It implies removal.  */
  x->interactive = 0;
  x->stdin_tty = 0;

  x->verbose = 0;
}

static void
cp_option_init (struct cp_options *x)
{
  x->copy_as_regular = 0;  /* FIXME: maybe make this an option */
  x->dereference = DEREF_NEVER;
  x->unlink_dest_before_opening = 0;
  x->unlink_dest_after_failed_open = 0;
  x->failed_unlink_is_fatal = 1;
  x->hard_link = 0;
  x->interactive = 0;
  x->move_mode = 1;
  x->myeuid = geteuid ();
  x->one_file_system = 0;
  x->preserve_owner_and_group = 1;
  x->preserve_chmod_bits = 1;
  x->preserve_timestamps = 1;
  x->require_preserve = 0;  /* FIXME: maybe make this an option */
  x->recursive = 1;
  x->sparse_mode = SPARSE_AUTO;  /* FIXME: maybe make this an option */
  x->symbolic_link = 0;
  x->set_mode = 0;
  x->mode = 0;

  /* Find out the current file creation mask, to knock the right bits
     when using chmod.  The creation mask is set to be liberal, so
     that created directories can be written, even if it would not
     have been allowed with the mask this process was started with.  */
  x->umask_kill = ~ umask (0);

  x->update = 0;
  x->verbose = 0;
  x->xstat = lstat;
}

/* If PATH is an existing directory, return nonzero, else 0.  */

static int
is_real_dir (const char *path)
{
  struct stat stats;

  return lstat (path, &stats) == 0 && S_ISDIR (stats.st_mode);
}

/* Move SOURCE onto DEST.  Handles cross-filesystem moves.
   If SOURCE is a directory, DEST must not exist.
   Return 0 if successful, non-zero if an error occurred.  */

static int
do_move (const char *source, const char *dest, const struct cp_options *x)
{
  static int first = 1;
  int copy_into_self;
  int rename_succeeded;
  int fail;

  if (first)
    {
      first = 0;

      /* Allocate space for remembering copied and created files.  */
      hash_init (INITIAL_HASH_MODULE, INITIAL_ENTRY_TAB_SIZE);
    }

  fail = copy (source, dest, 0, x, &copy_into_self, &rename_succeeded);

  if (!fail)
    {
      const char *dir_to_remove;
      if (copy_into_self)
	{
	  /* In general, when copy returns with copy_into_self set, SOURCE is
	     the same as, or a parent of DEST.  In this case we know it's a
	     parent.  It doesn't make sense to move a directory into itself, and
	     besides in some situations doing so would give highly nonintuitive
	     results.  Run this `mkdir b; touch a c; mv * b' in an empty
	     directory.  Here's the result of running echo `find b -print`:
	     b b/a b/b b/b/a b/c.  Notice that only file `a' was copied
	     into b/b.  Handle this by giving a diagnostic, removing the
	     copied-into-self directory, DEST (`b/b' in the example),
	     and failing.  */

	  dir_to_remove = NULL;
	  fail = 1;
	}
      else if (rename_succeeded)
	{
	  /* No need to remove anything.  SOURCE was successfully
	     renamed to DEST.  */
	  dir_to_remove = NULL;
	}
      else
	{
	  /* This may mean SOURCE and DEST referred to different devices.
	     It may also conceivably mean that even though they referred
	     to the same device, rename wasn't implemented for that device.

	     E.g., (from Joel N. Weber),
	     [...] there might someday be cases where you can't rename
	     but you can copy where the device name is the same, especially
	     on Hurd.  Consider an ftpfs with a primitive ftp server that
	     supports uploading, downloading and deleting, but not renaming.

	     Also, note that comparing device numbers is not a reliable
	     check for `can-rename'.  Some systems can be set up so that
	     files from many different physical devices all have the same
	     st_dev field.  This is a feature of some NFS mounting
	     configurations.

	     We reach this point if SOURCE has been successfully copied
	     to DEST.  Now we have to remove SOURCE.

	     This function used to resort to copying only when rename
	     failed and set errno to EXDEV.  */

	  dir_to_remove = source;
	}

      if (dir_to_remove != NULL)
	{
	  struct rm_options rm_options;
	  struct File_spec fs;
	  enum RM_status status;

	  rm_option_init (&rm_options);
	  rm_options.verbose = x->verbose;

	  remove_init ();

	  fspec_init_file (&fs, dir_to_remove);

	  /* Remove any trailing slashes.  This is necessary if we
	     took the else branch of movefile.  */
	  strip_trailing_slashes (fs.filename);

	  status = rm (&fs, 1, &rm_options);
	  assert (VALID_STATUS (status));
	  if (status == RM_ERROR)
	    fail = 1;

	  remove_fini ();

	  if (fail)
	    error (0, errno, _("cannot remove %s"), quote (dir_to_remove));
	}
    }

  return fail;
}

/* Move file SOURCE onto DEST.  Handles the case when DEST is a directory.
   DEST_IS_DIR must be nonzero when DEST is a directory or a symlink to a
   directory and zero otherwise.
   Return 0 if successful, non-zero if an error occurred.  */

static int
movefile (char *source, char *dest, int dest_is_dir,
	  const struct cp_options *x)
{
  int dest_had_trailing_slash = strip_trailing_slashes (dest);
  int fail;

  /* This code was introduced to handle the ambiguity in the semantics
     of mv that is induced by the varying semantics of the rename function.
     Some systems (e.g., Linux) have a rename function that honors a
     trailing slash, while others (like Solaris 5,6,7) have a rename
     function that ignores a trailing slash.  I believe the Linux
     rename semantics are POSIX and susv2 compliant.  */

  if (remove_trailing_slashes)
    strip_trailing_slashes (source);

  /* In addition to when DEST is a directory, if DEST has a trailing
     slash and neither SOURCE nor DEST is a directory, presume the target
     is DEST/`basename source`.  This converts `mv x y/' to `mv x y/x'.
     This change means that the command `mv any file/' will now fail
     rather than performing the move.  The case when SOURCE is a
     directory and DEST is not is properly diagnosed by do_move.  */

  if (dest_is_dir || (dest_had_trailing_slash && !is_real_dir (source)))
    {
      /* DEST is a directory; build full target filename. */
      char *src_basename;
      char *new_dest;

      strip_trailing_slashes (source);
      src_basename = base_name (source);
      new_dest = path_concat (dest, src_basename, NULL);
      if (new_dest == NULL)
	xalloc_die ();
      fail = do_move (source, new_dest, x);

      /* Do not free new_dest.  It may have been squirreled away by
	 the remember_copied function.  */
    }
  else
    {
      fail = do_move (source, dest, x);
    }

  return fail;
}

void
usage (int status)
{
  if (status != 0)
    fprintf (stderr, _("Try `%s --help' for more information.\n"),
	     program_name);
  else
    {
      printf (_("\
Usage: %s [OPTION]... SOURCE DEST\n\
  or:  %s [OPTION]... SOURCE... DIRECTORY\n\
  or:  %s [OPTION]... --target-directory=DIRECTORY SOURCE...\n\
"),
	      program_name, program_name, program_name);
      printf (_("\
Rename SOURCE to DEST, or move SOURCE(s) to DIRECTORY.\n\
\n\
      --backup[=CONTROL]       make a backup of each existing destination file\n\
  -b                           like --backup but does not accept an argument\n\
  -f, --force                  never prompt before overwriting\n\
  -i, --interactive            prompt before overwrite\n\
      --strip-trailing-slashes  remove any trailing slashes from each SOURCE\n\
                                 argument\n\
  -S, --suffix=SUFFIX          override the usual backup suffix\n\
      --target-directory=DIRECTORY  move all SOURCE arguments into DIRECTORY\n\
  -u, --update                 move only older or brand new non-directories\n\
  -v, --verbose                explain what is being done\n\
      --help                   display this help and exit\n\
      --version                output version information and exit\n\
\n\
"));
      printf (_("\
The backup suffix is `~', unless set with --suffix or SIMPLE_BACKUP_SUFFIX.\n\
The version control method may be selected via the --backup option or through\n\
the VERSION_CONTROL environment variable.  Here are the values:\n\
\n\
  none, off       never make backups (even if --backup is given)\n\
  numbered, t     make numbered backups\n\
  existing, nil   numbered if numbered backups exist, simple otherwise\n\
  simple, never   always make simple backups\n\
"));
      puts (_("\nReport bugs to <bug-fileutils@gnu.org>."));
    }
  exit (status);
}

int
main (int argc, char **argv)
{
  int c;
  int errors;
  int make_backups = 0;
  int dest_is_dir;
  char *backup_suffix_string;
  char *version_control_string = NULL;
  struct cp_options x;
  char *target_directory = NULL;
  int target_directory_specified;
  unsigned int n_files;
  char **file;

  program_name = argv[0];
  setlocale (LC_ALL, "");
  bindtextdomain (PACKAGE, LOCALEDIR);
  textdomain (PACKAGE);

  atexit (close_stdout);

  cp_option_init (&x);

  /* FIXME: consider not calling getenv for SIMPLE_BACKUP_SUFFIX unless
     we'll actually use backup_suffix_string.  */
  backup_suffix_string = getenv ("SIMPLE_BACKUP_SUFFIX");

  errors = 0;

  while ((c = getopt_long (argc, argv, "bfiuvS:V:", long_options, NULL)) != -1)
    {
      switch (c)
	{
	case 0:
	  break;

	case 'V':  /* FIXME: this is deprecated.  Remove it in 2001.  */
	  error (0, 0,
		 _("warning: --version-control (-V) is obsolete;  support for\
 it\nwill be removed in some future release.  Use --backup=%s instead."
		   ), optarg);
	  /* Fall through.  */

	case 'b':
	  make_backups = 1;
	  if (optarg)
	    version_control_string = optarg;
	  break;
	case 'f':
	  x.interactive = 0;
	  break;
	case 'i':
	  x.interactive = 1;
	  break;
	case STRIP_TRAILING_SLASHES_OPTION:
	  remove_trailing_slashes = 1;
	  break;
	case TARGET_DIRECTORY_OPTION:
	  target_directory = optarg;
	  break;
	case 'u':
	  x.update = 1;
	  break;
	case 'v':
	  x.verbose = 1;
	  break;
	case 'S':
	  make_backups = 1;
	  backup_suffix_string = optarg;
	  break;
	case_GETOPT_HELP_CHAR;
	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
	default:
	  usage (1);
	}
    }

  n_files = argc - optind;
  file = argv + optind;

  target_directory_specified = (target_directory != NULL);
  if (target_directory == NULL && n_files != 0)
    target_directory = file[n_files - 1];

  dest_is_dir = (n_files > 0 && isdir (target_directory));

  if (n_files == 0 || (n_files == 1 && !target_directory_specified))
    {
      error (0, 0, _("missing file argument"));
      usage (1);
    }

  if (target_directory_specified)
    {
      if (!dest_is_dir)
	{
	  error (0, 0, _("specified target, %s is not a directory"),
		 quote (target_directory));
	  usage (1);
	}
    }
  else if (n_files > 2 && !dest_is_dir)
    {
      error (0, 0,
	    _("when moving multiple files, last argument must be a directory"));
      usage (1);
    }

  if (backup_suffix_string)
    simple_backup_suffix = xstrdup (backup_suffix_string);

  x.backup_type = (make_backups
		   ? xget_version (_("backup type"),
				   version_control_string)
		   : none);

  /* Move each arg but the last into the target_directory.  */
  {
    unsigned int last_file_idx = (target_directory_specified
				  ? n_files - 1
				  : n_files - 2);
    unsigned int i;
    for (i = 0; i <= last_file_idx; ++i)
      errors |= movefile (file[i], target_directory, dest_is_dir, &x);
  }

  exit (errors);
}