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
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
|
/* copy.c -- core functions for copying files and directories
Copyright (C) 89, 90, 91, 1995-2000 Free Software Foundation.
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. */
/* Extracted from cp.c and librarified by Jim Meyering. */
#ifdef _AIX
#pragma alloca
#endif
#include <config.h>
#include <stdio.h>
#include <assert.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "backupfile.h"
#include "savedir.h"
#include "copy.h"
#include "cp-hash.h"
#include "dirname.h"
#include "path-concat.h"
#include "same.h"
#define DO_CHOWN(Chown, File, New_uid, New_gid) \
(Chown ((File), (x->myeuid == 0 ? (New_uid) : x->myeuid), (New_gid)) \
/* If non-root uses -p, it's ok if we can't preserve ownership. \
But root probably wants to know, e.g. if NFS disallows it, \
or if the target system doesn't support file ownership. */ \
&& ((errno != EPERM && errno != EINVAL) || x->myeuid == 0))
struct dir_list
{
struct dir_list *parent;
ino_t ino;
dev_t dev;
};
int full_write ();
int euidaccess ();
int yesno ();
static int copy_internal PARAMS ((const char *src_path, const char *dst_path,
int new_dst, dev_t device,
struct dir_list *ancestors,
const struct cp_options *x,
int move_mode,
int *copy_into_self,
int *rename_succeeded));
/* The invocation name of this program. */
extern char *program_name;
/* Encapsulate selection of the file mode to be applied to
new non-directories. */
static mode_t
new_nondir_mode (const struct cp_options *option, mode_t mode)
{
/* In some applications (e.g., install), use precisely the
specified mode. */
if (option->set_mode)
return option->mode;
/* In others (e.g., cp, mv), apply the user's umask. */
return mode & option->umask_kill;
}
/* FIXME: describe */
/* FIXME: rewrite this to use a hash table so we avoid the quadratic
performance hit that's probably noticeable only on trees deeper
than a few hundred levels. See use of active_dir_map in remove.c */
static int
is_ancestor (const struct stat *sb, const struct dir_list *ancestors)
{
while (ancestors != 0)
{
if (ancestors->ino == sb->st_ino && ancestors->dev == sb->st_dev)
return 1;
ancestors = ancestors->parent;
}
return 0;
}
/* Read the contents of the directory SRC_PATH_IN, and recursively
copy the contents to DST_PATH_IN. NEW_DST is nonzero if
DST_PATH_IN is a directory that was created previously in the
recursion. SRC_SB and ANCESTORS describe SRC_PATH_IN.
Set *COPY_INTO_SELF to nonzero if SRC_PATH_IN is a parent of
(or the same as) DST_PATH_IN; otherwise, set it to zero.
Return 0 if successful, -1 if an error occurs. */
static int
copy_dir (const char *src_path_in, const char *dst_path_in, int new_dst,
const struct stat *src_sb, struct dir_list *ancestors,
const struct cp_options *x, int *copy_into_self)
{
char *name_space;
char *namep;
int ret = 0;
name_space = savedir (src_path_in, src_sb->st_size);
if (name_space == NULL)
{
error (0, errno, "%s", src_path_in);
return -1;
}
namep = name_space;
while (*namep != '\0')
{
int local_copy_into_self;
char *src_path = path_concat (src_path_in, namep, NULL);
char *dst_path = path_concat (dst_path_in, namep, NULL);
if (dst_path == NULL || src_path == NULL)
error (1, 0, _("virtual memory exhausted"));
ret |= copy_internal (src_path, dst_path, new_dst, src_sb->st_dev,
ancestors, x, 0, &local_copy_into_self, NULL);
*copy_into_self |= local_copy_into_self;
/* Free the memory for `src_path'. The memory for `dst_path'
cannot be deallocated, since it is used to create multiple
hard links. */
free (src_path);
namep += strlen (namep) + 1;
}
free (name_space);
return -ret;
}
/* Copy a regular file from SRC_PATH to DST_PATH.
If the source file contains holes, copies holes and blocks of zeros
in the source file as holes in the destination file.
(Holes are read as zeroes by the `read' system call.)
Return 0 if successful, -1 if an error occurred.
FIXME: describe sparse_mode. */
static int
copy_reg (const char *src_path, const char *dst_path,
enum Sparse_type sparse_mode)
{
char *buf;
int buf_size;
int dest_desc;
int source_desc;
int n_read;
struct stat sb;
char *cp;
int *ip;
int return_val = 0;
off_t n_read_total = 0;
int last_write_made_hole = 0;
int make_holes = (sparse_mode == SPARSE_ALWAYS);
source_desc = open (src_path, O_RDONLY);
if (source_desc < 0)
{
/* If SRC_PATH doesn't exist, then chances are good that the
user did something like this `cp --backup foo foo': and foo
existed to start with, but copy_internal renamed DST_PATH
with the backup suffix, thus also renaming SRC_PATH. */
if (errno == ENOENT)
error (0, 0, _("`%s' and `%s' are the same file"),
src_path, dst_path);
else
error (0, errno, _("cannot open `%s' for reading"), src_path);
return -1;
}
/* Create the new regular file with small permissions initially,
to not create a security hole. */
dest_desc = open (dst_path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
if (dest_desc < 0)
{
error (0, errno, _("cannot create regular file `%s'"), dst_path);
return_val = -1;
goto ret2;
}
/* Find out the optimal buffer size. */
if (fstat (dest_desc, &sb))
{
error (0, errno, "%s", dst_path);
return_val = -1;
goto ret;
}
buf_size = ST_BLKSIZE (sb);
#if HAVE_STRUCT_STAT_ST_BLOCKS
if (sparse_mode == SPARSE_AUTO && S_ISREG (sb.st_mode))
{
/* Use a heuristic to determine whether SRC_PATH contains any
sparse blocks. */
if (fstat (source_desc, &sb))
{
error (0, errno, "%s", src_path);
return_val = -1;
goto ret;
}
/* If the file has fewer blocks than would normally
be needed for a file of its size, then
at least one of the blocks in the file is a hole. */
if (S_ISREG (sb.st_mode)
&& sb.st_size / ST_NBLOCKSIZE > ST_NBLOCKS (sb))
make_holes = 1;
}
#endif
/* Make a buffer with space for a sentinel at the end. */
buf = (char *) alloca (buf_size + sizeof (int));
for (;;)
{
n_read = read (source_desc, buf, buf_size);
if (n_read < 0)
{
#ifdef EINTR
if (errno == EINTR)
continue;
#endif
error (0, errno, "%s", src_path);
return_val = -1;
goto ret;
}
if (n_read == 0)
break;
n_read_total += n_read;
ip = 0;
if (make_holes)
{
buf[n_read] = 1; /* Sentinel to stop loop. */
/* Find first nonzero *word*, or the word with the sentinel. */
ip = (int *) buf;
while (*ip++ == 0)
;
/* Find the first nonzero *byte*, or the sentinel. */
cp = (char *) (ip - 1);
while (*cp++ == 0)
;
/* If we found the sentinel, the whole input block was zero,
and we can make a hole. */
if (cp > buf + n_read)
{
/* Make a hole. */
if (lseek (dest_desc, (off_t) n_read, SEEK_CUR) < 0L)
{
error (0, errno, "%s", dst_path);
return_val = -1;
goto ret;
}
last_write_made_hole = 1;
}
else
/* Clear to indicate that a normal write is needed. */
ip = 0;
}
if (ip == 0)
{
if (full_write (dest_desc, buf, n_read) < 0)
{
error (0, errno, "%s", dst_path);
return_val = -1;
goto ret;
}
last_write_made_hole = 0;
}
}
/* If the file ends with a `hole', something needs to be written at
the end. Otherwise the kernel would truncate the file at the end
of the last write operation. */
if (last_write_made_hole)
{
#if HAVE_FTRUNCATE
/* Write a null character and truncate it again. */
if (full_write (dest_desc, "", 1) < 0
|| ftruncate (dest_desc, n_read_total) < 0)
#else
/* Seek backwards one character and write a null. */
if (lseek (dest_desc, (off_t) -1, SEEK_CUR) < 0L
|| full_write (dest_desc, "", 1) < 0)
#endif
{
error (0, errno, "%s", dst_path);
return_val = -1;
}
}
ret:
if (close (dest_desc) < 0)
{
error (0, errno, "%s", dst_path);
return_val = -1;
}
ret2:
if (close (source_desc) < 0)
{
error (0, errno, "%s", src_path);
return_val = -1;
}
return return_val;
}
/* Copy the file SRC_PATH to the file DST_PATH. The files may be of
any type. NEW_DST should be nonzero if the file DST_PATH cannot
exist because its parent directory was just created; NEW_DST should
be zero if DST_PATH might already exist. DEVICE is the device
number of the parent directory, or 0 if the parent of this file is
not known. ANCESTORS points to a linked, null terminated list of
devices and inodes of parent directories of SRC_PATH.
Set *COPY_INTO_SELF to nonzero if SRC_PATH is a parent of (or the
same as) DST_PATH; otherwise, set it to zero.
Return 0 if successful, 1 if an error occurs. */
static int
copy_internal (const char *src_path, const char *dst_path,
int new_dst,
dev_t device,
struct dir_list *ancestors,
const struct cp_options *x,
int move_mode,
int *copy_into_self,
int *rename_succeeded)
{
struct stat src_sb;
struct stat dst_sb;
int src_mode;
int src_type;
char *earlier_file;
char *dst_backup = NULL;
int backup_succeeded = 0;
int fix_mode = 0;
int rename_errno;
int delayed_fail;
if (move_mode && rename_succeeded)
*rename_succeeded = 0;
*copy_into_self = 0;
if ((*(x->xstat)) (src_path, &src_sb))
{
error (0, errno, "%s", src_path);
return 1;
}
/* We wouldn't insert a node unless nlink > 1, except that we need to
find created files so as to not copy infinitely if a directory is
copied into itself. */
earlier_file = remember_copied (dst_path, src_sb.st_ino, src_sb.st_dev);
src_mode = src_sb.st_mode;
src_type = src_sb.st_mode;
if (S_ISDIR (src_type) && !x->recursive)
{
error (0, 0, _("%s: omitting directory"), src_path);
return 1;
}
if (!new_dst)
{
if ((*(x->xstat)) (dst_path, &dst_sb))
{
if (errno != ENOENT)
{
error (0, errno, "%s", dst_path);
return 1;
}
else
{
new_dst = 1;
}
}
else
{
int same;
/* The destination file exists already. */
same = (SAME_INODE (src_sb, dst_sb));
#ifdef S_ISLNK
/* If we're preserving symlinks (--no-dereference) and either
file is a symlink, use stat (not xstat) to see if they refer
to the same file. */
if (!same
/* If we'll remove DST_PATH first, then this doesn't matter. */
&& ! x->force
/* Allow them to be the same (and don't set `same') if we're
in move mode and the target is a symlink. That is ok, since
we remove any existing destination file before opening it --
via `rename' if they're on the same file system,
via `unlink(DST_PATH)' otherwise. */
&& !(move_mode
&& S_ISLNK (dst_sb.st_mode))
/* If we're making a backup, we'll detect the problem case in
copy_reg because SRC_PATH will no longer exist. Allowing
the test to be deferred lets cp do some useful things.
But when creating hardlinks and SRC_PATH is a symlink
but DST_PATH is not we must test anyway. */
&& (x->backup_type == none
|| (x->hard_link
&& S_ISLNK (src_sb.st_mode)
&& !S_ISLNK (dst_sb.st_mode)))
&& !x->dereference
&& (S_ISLNK (dst_sb.st_mode) ^ S_ISLNK (src_sb.st_mode)))
{
struct stat dst2_sb;
struct stat src2_sb;
if (stat (dst_path, &dst2_sb) == 0
&& stat (src_path, &src2_sb) == 0
&& SAME_INODE (src2_sb, dst2_sb))
{
same = 1;
}
}
#endif
if (same)
{
if (x->hard_link)
return 0;
if (x->backup_type == none
&& (!x->force || same_name (src_path, dst_path)))
{
error (0, 0, _("`%s' and `%s' are the same file"),
src_path, dst_path);
return 1;
}
}
if (!S_ISDIR (src_type))
{
if (S_ISDIR (dst_sb.st_mode))
{
error (0, 0,
_("%s: cannot overwrite directory with non-directory"),
dst_path);
return 1;
}
if (x->update && MTIME_CMP (src_sb, dst_sb) <= 0)
return 0;
}
if (!S_ISDIR (src_type) && x->interactive)
{
if (euidaccess (dst_path, W_OK) != 0 && x->force)
{
fprintf (stderr,
_("%s: overwrite `%s', overriding mode %04lo? "),
program_name, dst_path,
(unsigned long) (dst_sb.st_mode & CHMOD_MODE_BITS));
}
else
{
fprintf (stderr, _("%s: overwrite `%s'? "),
program_name, dst_path);
}
if (!yesno ())
return (move_mode ? 1 : 0);
}
if (move_mode)
{
/* In move_mode, DEST may not be an existing directory. */
if (S_ISDIR (dst_sb.st_mode))
{
error (0, 0, _("%s: cannot overwrite directory"), dst_path);
return 1;
}
/* Don't allow user to move a directory onto a non-directory. */
if (S_ISDIR (src_sb.st_mode) && !S_ISDIR (dst_sb.st_mode))
{
error (0, 0,
_("cannot move directory onto non-directory: %s -> %s"),
src_path, dst_path);
return 1;
}
}
if (x->backup_type != none && !S_ISDIR (dst_sb.st_mode))
{
char *tmp_backup = find_backup_file_name (dst_path,
x->backup_type);
if (tmp_backup == NULL)
error (1, 0, _("virtual memory exhausted"));
/* Detect (and fail) when creating the backup file would
destroy the source file. Before, running the commands
cd /tmp; rm -f a a~; : > a; echo A > a~; cp -b -V simple a~ a
would leave two zero-length files: a and a~. */
if (STREQ (tmp_backup, src_path))
{
const char *fmt;
fmt = (move_mode
? _("backing up `%s' would destroy source; `%s' not moved")
: _("backing up `%s' would destroy source; `%s' not copied"));
error (0, 0, fmt, dst_path, src_path);
free (tmp_backup);
return 1;
}
dst_backup = (char *) alloca (strlen (tmp_backup) + 1);
strcpy (dst_backup, tmp_backup);
free (tmp_backup);
if (rename (dst_path, dst_backup))
{
if (errno != ENOENT)
{
error (0, errno, _("cannot backup `%s'"), dst_path);
return 1;
}
else
{
dst_backup = NULL;
}
}
else
{
backup_succeeded = 1;
}
new_dst = 1;
}
else if (x->force)
{
if (S_ISDIR (dst_sb.st_mode))
{
/* Temporarily change mode to allow overwriting. */
if (euidaccess (dst_path, W_OK | X_OK) != 0)
{
if (chmod (dst_path, S_IRWXU))
{
error (0, errno, "%s", dst_path);
return 1;
}
else
fix_mode = 1;
}
}
else
{
if (unlink (dst_path) && errno != ENOENT)
{
error (0, errno, _("cannot remove old link to `%s'"),
dst_path);
if (x->failed_unlink_is_fatal)
return 1;
}
else
{
new_dst = 1;
}
}
}
}
}
/* If the source is a directory, we don't always create the destination
directory. So --verbose should not announce anything until we're
sure we'll create a directory. */
if (x->verbose && !S_ISDIR (src_type))
{
printf ("%s -> %s", src_path, dst_path);
if (backup_succeeded)
printf (_(" (backup: %s)"), dst_backup);
putchar ('\n');
}
/* Did we copy this inode somewhere else (in this command line argument)
and therefore this is a second hard link to the inode? */
if (!x->dereference && src_sb.st_nlink > 1 && earlier_file)
{
/* Avoid damaging the destination filesystem by refusing to preserve
hard-linked directories (which are found at least in Netapp snapshot
directories). */
if (S_ISDIR (src_type))
{
error (0, 0, _("won't create hard link `%s' to directory `%s'"),
dst_path, earlier_file);
goto un_backup;
}
if (link (earlier_file, dst_path))
{
error (0, errno, "%s", dst_path);
goto un_backup;
}
return 0;
}
if (move_mode)
{
if (rename (src_path, dst_path) == 0)
{
if (x->verbose && S_ISDIR (src_type))
printf ("%s -> %s\n", src_path, dst_path);
if (rename_succeeded)
*rename_succeeded = 1;
return 0;
}
/* FIXME: someday, consider what to do when moving a directory into
itself but when source and destination are on different devices. */
/* This happens when attempting to rename a directory to a
subdirectory of itself. */
if (errno == EINVAL
/* When src_path is on an NFS file system, some types of
clients, e.g., SunOS4.1.4 and IRIX-5.3, set errno to EIO
instead. Testing for this here risks misinterpreting a real
I/O error as an attempt to move a directory into itself, so
FIXME: consider not doing this. */
|| errno == EIO
/* And with SunOS-4.1.4 client and OpenBSD-2.3 server,
we get ENOTEMPTY. */
|| errno == ENOTEMPTY)
{
/* FIXME: this is a little fragile in that it relies on rename(2)
failing with a specific errno value. Expect problems on
non-POSIX systems. */
*copy_into_self = 1;
return 0;
}
/* Ignore other types of failure (e.g. EXDEV), since the following
code will try to perform a copy, then remove. */
/* Save this value of errno to use in case the unlink fails. */
rename_errno = errno;
/* The rename attempt has failed. Remove any existing destination
file so that a cross-device `mv' acts as if it were really using
the rename syscall. */
if (unlink (dst_path) && errno != ENOENT)
{
/* Use the value of errno from the failed rename. */
error (0, rename_errno, _("cannot move `%s' to `%s'"),
src_path, dst_path);
return 1;
}
}
delayed_fail = 0;
if (S_ISDIR (src_type))
{
struct dir_list *dir;
/* If this directory has been copied before during the
recursion, there is a symbolic link to an ancestor
directory of the symbolic link. It is impossible to
continue to copy this, unless we've got an infinite disk. */
if (is_ancestor (&src_sb, ancestors))
{
error (0, 0, _("%s: cannot copy cyclic symbolic link"), src_path);
goto un_backup;
}
/* Insert the current directory in the list of parents. */
dir = (struct dir_list *) alloca (sizeof (struct dir_list));
dir->parent = ancestors;
dir->ino = src_sb.st_ino;
dir->dev = src_sb.st_dev;
if (new_dst || !S_ISDIR (dst_sb.st_mode))
{
/* Create the new directory writable and searchable, so
we can create new entries in it. */
if (mkdir (dst_path, (src_mode & x->umask_kill) | S_IRWXU))
{
error (0, errno, _("cannot create directory `%s'"), dst_path);
goto un_backup;
}
/* Insert the created directory's inode and device
numbers into the search structure, so that we can
avoid copying it again. */
if (remember_created (dst_path))
goto un_backup;
if (x->verbose)
printf ("%s -> %s\n", src_path, dst_path);
}
/* Are we crossing a file system boundary? */
if (x->one_file_system && device != 0 && device != src_sb.st_dev)
return 0;
/* Copy the contents of the directory. */
if (copy_dir (src_path, dst_path, new_dst, &src_sb, dir, x,
copy_into_self))
{
/* Don't just return here -- otherwise, the failure to read a
single file in a source directory would cause the containing
destination directory not to have owner/perms set properly. */
delayed_fail = 1;
}
}
#ifdef S_ISLNK
else if (x->symbolic_link)
{
if (*src_path != '/')
{
/* Check that DST_PATH denotes a file in the current directory. */
struct stat dot_sb;
struct stat dst_parent_sb;
char *dst_parent;
int in_current_dir;
dst_parent = dir_name (dst_path);
if (dst_parent == NULL)
error (1, 0, _("virtual memory exhausted"));
in_current_dir = (STREQ (".", dst_parent)
/* If either stat call fails, it's ok not to report
the failure and say dst_path is in the current
directory. Other things will fail later. */
|| stat (".", &dot_sb)
|| stat (dst_parent, &dst_parent_sb)
|| SAME_INODE (dot_sb, dst_parent_sb));
free (dst_parent);
if (! in_current_dir)
{
error (0, 0,
_("%s: can make relative symbolic links only in current directory"),
dst_path);
goto un_backup;
}
}
if (symlink (src_path, dst_path))
{
error (0, errno, "%s", dst_path);
goto un_backup;
}
return 0;
}
#endif
else if (x->hard_link)
{
if (link (src_path, dst_path))
{
error (0, errno, _("cannot create link `%s'"), dst_path);
goto un_backup;
}
return 0;
}
else if (S_ISREG (src_type)
|| (x->copy_as_regular && !S_ISDIR (src_type)
#ifdef S_ISLNK
&& !S_ISLNK (src_type)
#endif
))
{
if (copy_reg (src_path, dst_path, x->sparse_mode))
goto un_backup;
}
else
#ifdef S_ISFIFO
if (S_ISFIFO (src_type))
{
if (mkfifo (dst_path, new_nondir_mode (x, src_mode)))
{
error (0, errno, _("cannot create fifo `%s'"), dst_path);
goto un_backup;
}
}
else
#endif
if (S_ISBLK (src_type) || S_ISCHR (src_type)
#ifdef S_ISSOCK
|| S_ISSOCK (src_type)
#endif
)
{
if (mknod (dst_path, new_nondir_mode (x, src_mode), src_sb.st_rdev))
{
error (0, errno, _("cannot create special file `%s'"), dst_path);
goto un_backup;
}
}
else
#ifdef S_ISLNK
if (S_ISLNK (src_type))
{
char *link_val;
int link_size;
link_val = (char *) alloca (PATH_MAX + 2);
link_size = readlink (src_path, link_val, PATH_MAX + 1);
if (link_size < 0)
{
error (0, errno, _("cannot read symbolic link `%s'"), src_path);
goto un_backup;
}
link_val[link_size] = '\0';
if (symlink (link_val, dst_path))
{
int saved_errno = errno;
int same_link = 0;
if (x->update && !new_dst && S_ISLNK (dst_sb.st_mode))
{
/* See if the destination is already the desired symlink. */
char *dest_link_name = (char *) alloca (PATH_MAX + 2);
int dest_link_len = readlink (dst_path, dest_link_name,
PATH_MAX + 1);
if (dest_link_len > 0)
{
dest_link_name[dest_link_len] = '\0';
if (STREQ (dest_link_name, link_val))
same_link = 1;
}
}
if (! same_link)
{
error (0, saved_errno, _("cannot create symbolic link `%s'"),
dst_path);
goto un_backup;
}
}
if (x->preserve_owner_and_group)
{
/* Preserve the owner and group of the just-`copied'
symbolic link, if possible. */
# if HAVE_LCHOWN
if (DO_CHOWN (lchown, dst_path, src_sb.st_uid, src_sb.st_gid))
{
error (0, errno, _("preserving ownership for %s"), dst_path);
goto un_backup;
}
# else
/* Can't preserve ownership of symlinks.
FIXME: maybe give a warning or even error for symlinks
in directories with the sticky bit set -- there, not
preserving owner/group is a potential security problem. */
# endif
}
return 0;
}
else
#endif
{
error (0, 0, _("%s: unknown file type"), src_path);
goto un_backup;
}
/* POSIX says that `cp -p' must restore the following:
- permission bits
- setuid, setgid bits
- owner and group
If it fails to restore any of those, we may give a warning but
the destination must not be removed.
FIXME: implement the above. */
/* Adjust the times (and if possible, ownership) for the copy.
chown turns off set[ug]id bits for non-root,
so do the chmod last. */
if (x->preserve_timestamps)
{
struct utimbuf utb;
/* There's currently no interface to set file timestamps with
better than 1-second resolution, so discard any fractional
part of the source timestamp. */
utb.actime = src_sb.st_atime;
utb.modtime = src_sb.st_mtime;
if (utime (dst_path, &utb))
{
error (0, errno, _("preserving times for %s"), dst_path);
if (x->require_preserve)
return 1;
}
}
if (x->preserve_owner_and_group)
{
if (DO_CHOWN (chown, dst_path, src_sb.st_uid, src_sb.st_gid))
{
error (0, errno, _("preserving ownership for %s"), dst_path);
if (x->require_preserve)
return 1;
}
}
if (x->set_mode)
{
/* This is so install's -m MODE option works. */
if (chmod (dst_path, x->mode))
{
error (0, errno, _("setting permissions for %s"), dst_path);
return 1;
}
}
else if ((x->preserve_chmod_bits || new_dst)
&& (x->copy_as_regular || S_ISREG (src_type) || S_ISDIR (src_type)))
{
mode_t dst_mode = src_mode;
/* Honor the umask for `cp', but not for `mv'. */
if (!x->move_mode)
dst_mode &= x->umask_kill;
if (chmod (dst_path, dst_mode))
{
error (0, errno, _("preserving permissions for %s"), dst_path);
if (x->require_preserve)
return 1;
}
}
else if (fix_mode)
{
/* Reset the temporarily changed mode. */
if (chmod (dst_path, dst_sb.st_mode))
{
error (0, errno, _("restoring permissions of %s"), dst_path);
return 1;
}
}
return delayed_fail;
un_backup:
if (dst_backup)
{
if (rename (dst_backup, dst_path))
error (0, errno, _("cannot un-backup `%s'"), dst_path);
else
{
if (x->verbose)
printf (_("%s -> %s (unbackup)\n"), dst_backup, dst_path);
}
}
return 1;
}
static int
valid_options (const struct cp_options *co)
{
assert (co != NULL);
assert (VALID_BACKUP_TYPE (co->backup_type));
/* FIXME: for some reason this assertion always fails,
at least on Solaris2.5.1. Just disable it for now. */
/* assert (co->xstat == lstat || co->xstat == stat); */
/* Make sure xstat and dereference are consistent. */
/* FIXME */
assert (VALID_SPARSE_MODE (co->sparse_mode));
return 1;
}
/* Copy the file SRC_PATH to the file DST_PATH. The files may be of
any type. NONEXISTENT_DST should be nonzero if the file DST_PATH
is known not to exist (e.g., because its parent directory was just
created); NONEXISTENT_DST should be zero if DST_PATH might already
exist. OPTIONS is ... FIXME-describe
Set *COPY_INTO_SELF to nonzero if SRC_PATH is a parent of (or the
same as) DST_PATH; otherwise, set it to zero.
Return 0 if successful, 1 if an error occurs. */
int
copy (const char *src_path, const char *dst_path,
int nonexistent_dst, const struct cp_options *options,
int *copy_into_self, int *rename_succeeded)
{
/* move_mode is set to the value from the `options' parameter for the
first copy_internal call. For all subsequent calls (if any), it must
be zero. */
int move_mode = options->move_mode;
assert (valid_options (options));
return copy_internal (src_path, dst_path, nonexistent_dst, 0, NULL,
options, move_mode, copy_into_self, rename_succeeded);
}
|