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
|
/* mv -- move or rename files
Copyright (C) 1986, 1989, 1990, 1991 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* Options:
-f, --force Assume a 'y' answer to all questions it would
normally ask, and not ask the questions.
-i, --interactive Require confirmation from the user before
performing any move that would destroy an
existing file.
-u, --update Do not move a nondirectory that has an
existing destination with the same or newer
modification time.
-v, --verbose List the name of each file as it is moved, and
the name it is moved to.
-b, --backup
-S, --suffix
-V, --version-control
Backup file creation.
Written by Mike Parker and David MacKenzie */
#ifdef _AIX
#pragma alloca
#endif
#include <stdio.h>
#include <getopt.h>
#include <sys/types.h>
#include "system.h"
#include "backupfile.h"
#include "version.h"
#ifndef _POSIX_VERSION
uid_t geteuid ();
#endif
char *basename ();
enum backup_type get_version ();
int isdir ();
int yesno ();
void error ();
void strip_trailing_slashes ();
int eaccess_stat ();
char *stpcpy ();
static int copy_reg ();
static int do_move ();
static int movefile ();
static void usage ();
/* The name this program was run with. */
char *program_name;
/* If nonzero, query the user before overwriting files. */
static int interactive;
/* If nonzero, do not query the user before overwriting unwritable
files. */
static int override_mode;
/* If nonzero, do not move a nondirectory that has an existing destination
with the same or newer modification time. */
static int update = 0;
/* If nonzero, list each file as it is moved. */
static int verbose;
/* If nonzero, stdin is a tty. */
static int stdin_tty;
/* This process's effective user ID. */
static uid_t myeuid;
/* If non-zero, display usage information and exit. */
static int show_help;
/* If non-zero, print the version on standard output and exit. */
static int show_version;
static struct option const long_options[] =
{
{"backup", no_argument, NULL, 'b'},
{"force", no_argument, NULL, 'f'},
{"interactive", no_argument, NULL, 'i'},
{"suffix", required_argument, NULL, 'S'},
{"update", no_argument, &update, 1},
{"verbose", no_argument, &verbose, 1},
{"version-control", required_argument, NULL, 'V'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
void
main (argc, argv)
int argc;
char **argv;
{
int c;
int errors;
int make_backups = 0;
char *version;
version = getenv ("SIMPLE_BACKUP_SUFFIX");
if (version)
simple_backup_suffix = version;
version = getenv ("VERSION_CONTROL");
program_name = argv[0];
myeuid = geteuid ();
interactive = override_mode = verbose = update = 0;
errors = 0;
while ((c = getopt_long (argc, argv, "bfiuvS:V:", long_options, (int *) 0))
!= EOF)
{
switch (c)
{
case 0:
break;
case 'b':
make_backups = 1;
break;
case 'f':
interactive = 0;
override_mode = 1;
break;
case 'i':
interactive = 1;
override_mode = 0;
break;
case 'u':
update = 1;
break;
case 'v':
verbose = 1;
break;
case 'S':
simple_backup_suffix = optarg;
break;
case 'V':
version = optarg;
break;
default:
usage ();
}
}
if (show_version)
{
printf ("%s\n", version_string);
exit (0);
}
if (show_help)
usage ();
if (argc < optind + 2)
usage ();
if (make_backups)
backup_type = get_version (version);
stdin_tty = isatty (0);
if (argc > optind + 2 && !isdir (argv[argc - 1]))
error (1, 0, "when moving multiple files, last argument must be a directory");
/* Move each arg but the last onto the last. */
for (; optind < argc - 1; ++optind)
errors |= movefile (argv[optind], argv[argc - 1]);
exit (errors);
}
/* If PATH is an existing directory, return nonzero, else 0. */
static int
is_real_dir (path)
char *path;
{
struct stat stats;
return lstat (path, &stats) == 0 && S_ISDIR (stats.st_mode);
}
/* Move file SOURCE onto DEST. Handles the case when DEST is a directory.
Return 0 if successful, 1 if an error occurred. */
static int
movefile (source, dest)
char *source;
char *dest;
{
strip_trailing_slashes (source);
if ((dest[strlen (dest) - 1] == '/' && !is_real_dir (source))
|| isdir (dest))
{
/* Target is a directory; build full target filename. */
char *base;
char *new_dest;
base = basename (source);
new_dest = (char *) alloca (strlen (dest) + 1 + strlen (base) + 1);
stpcpy (stpcpy (stpcpy (new_dest, dest), "/"), base);
return do_move (source, new_dest);
}
else
return do_move (source, dest);
}
static struct stat dest_stats, source_stats;
/* Move SOURCE onto DEST. Handles cross-filesystem moves.
If DEST is a directory, SOURCE must be also.
Return 0 if successful, 1 if an error occurred. */
static int
do_move (source, dest)
char *source;
char *dest;
{
char *dest_backup = NULL;
if (lstat (source, &source_stats) != 0)
{
error (0, errno, "%s", source);
return 1;
}
if (lstat (dest, &dest_stats) == 0)
{
if (source_stats.st_dev == dest_stats.st_dev
&& source_stats.st_ino == dest_stats.st_ino)
{
error (0, 0, "`%s' and `%s' are the same file", source, dest);
return 1;
}
if (S_ISDIR (dest_stats.st_mode))
{
error (0, 0, "%s: cannot overwrite directory", dest);
return 1;
}
if (!S_ISDIR (source_stats.st_mode) && update
&& source_stats.st_mtime <= dest_stats.st_mtime)
return 0;
if (!override_mode && (interactive || stdin_tty)
&& eaccess_stat (&dest_stats, W_OK))
{
fprintf (stderr, "%s: replace `%s', overriding mode %04o? ",
program_name, dest, dest_stats.st_mode & 07777);
if (!yesno ())
return 0;
}
else if (interactive)
{
fprintf (stderr, "%s: replace `%s'? ", program_name, dest);
if (!yesno ())
return 0;
}
if (backup_type != none)
{
char *tmp_backup = find_backup_file_name (dest);
if (tmp_backup == NULL)
error (1, 0, "virtual memory exhausted");
dest_backup = (char *) alloca (strlen (tmp_backup) + 1);
strcpy (dest_backup, tmp_backup);
free (tmp_backup);
if (rename (dest, dest_backup))
{
if (errno != ENOENT)
{
error (0, errno, "cannot backup `%s'", dest);
return 1;
}
else
dest_backup = NULL;
}
}
}
else if (errno != ENOENT)
{
error (0, errno, "%s", dest);
return 1;
}
if (verbose)
printf ("%s -> %s\n", source, dest);
if (rename (source, dest) == 0)
{
return 0;
}
if (errno != EXDEV)
{
error (0, errno, "cannot move `%s' to `%s'", source, dest);
goto un_backup;
}
/* rename failed on cross-filesystem link. Copy the file instead. */
if (copy_reg (source, dest))
goto un_backup;
if (unlink (source))
{
error (0, errno, "cannot remove `%s'", source);
return 1;
}
return 0;
un_backup:
if (dest_backup)
{
if (rename (dest_backup, dest))
error (0, errno, "cannot un-backup `%s'", dest);
}
return 1;
}
/* Copy regular file SOURCE onto file DEST.
Return 1 if an error occurred, 0 if successful. */
static int
copy_reg (source, dest)
char *source, *dest;
{
int ifd;
int ofd;
char buf[1024 * 8];
int len; /* Number of bytes read into `buf'. */
if (!S_ISREG (source_stats.st_mode))
{
error (0, 0, "cannot move `%s' across filesystems: Not a regular file",
source);
return 1;
}
if (unlink (dest) && errno != ENOENT)
{
error (0, errno, "cannot remove `%s'", dest);
return 1;
}
ifd = open (source, O_RDONLY, 0);
if (ifd < 0)
{
error (0, errno, "%s", source);
return 1;
}
ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (ofd < 0)
{
error (0, errno, "%s", dest);
close (ifd);
return 1;
}
while ((len = read (ifd, buf, sizeof (buf))) > 0)
{
int wrote = 0;
char *bp = buf;
do
{
wrote = write (ofd, bp, len);
if (wrote < 0)
{
error (0, errno, "%s", dest);
close (ifd);
close (ofd);
unlink (dest);
return 1;
}
bp += wrote;
len -= wrote;
} while (len > 0);
}
if (len < 0)
{
error (0, errno, "%s", source);
close (ifd);
close (ofd);
unlink (dest);
return 1;
}
if (close (ifd) < 0)
{
error (0, errno, "%s", source);
close (ofd);
return 1;
}
if (close (ofd) < 0)
{
error (0, errno, "%s", dest);
return 1;
}
/* chown turns off set[ug]id bits for non-root,
so do the chmod last. */
/* Try to copy the old file's modtime and access time. */
{
struct utimbuf tv;
tv.actime = source_stats.st_atime;
tv.modtime = source_stats.st_mtime;
if (utime (dest, &tv))
{
error (0, errno, "%s", dest);
return 1;
}
}
/* Try to preserve ownership. For non-root it might fail, but that's ok.
But root probably wants to know, e.g. if NFS disallows it. */
if (chown (dest, source_stats.st_uid, source_stats.st_gid)
&& (errno != EPERM || myeuid == 0))
{
error (0, errno, "%s", dest);
return 1;
}
if (chmod (dest, source_stats.st_mode & 07777))
{
error (0, errno, "%s", dest);
return 1;
}
return 0;
}
static void
usage ()
{
fprintf (stderr, "\
Usage: %s [options] source dest\n\
%s [options] source... directory\n\
Options:\n\
[-bfiuv] [-S backup-suffix] [-V {numbered,existing,simple}]\n\
[--backup] [--force] [--interactive] [--update] [--verbose]\n\
[--suffix=backup-suffix] [--version-control={numbered,existing,simple}]\n\
[--help] [--version]\n",
program_name, program_name);
exit (1);
}
|