-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathindex-pack.c
1869 lines (1661 loc) · 49.2 KB
/
index-pack.c
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
#include "builtin.h"
#include "config.h"
#include "delta.h"
#include "pack.h"
#include "csum-file.h"
#include "blob.h"
#include "commit.h"
#include "tag.h"
#include "tree.h"
#include "progress.h"
#include "fsck.h"
#include "exec-cmd.h"
#include "streaming.h"
#include "thread-utils.h"
#include "packfile.h"
#include "object-store.h"
#include "promisor-remote.h"
static const char index_pack_usage[] =
"git index-pack [-v] [-o <index-file>] [--keep | --keep=<msg>] [--verify] [--strict] (<pack-file> | --stdin [--fix-thin] [<pack-file>])";
struct object_entry {
struct pack_idx_entry idx;
unsigned long size;
unsigned char hdr_size;
signed char type;
signed char real_type;
};
struct object_stat {
unsigned delta_depth;
int base_object_no;
};
struct base_data {
struct base_data *base;
struct base_data *child;
struct object_entry *obj;
void *data;
unsigned long size;
int ref_first, ref_last;
int ofs_first, ofs_last;
};
struct thread_local {
pthread_t thread;
struct base_data *base_cache;
size_t base_cache_used;
int pack_fd;
};
/* Remember to update object flag allocation in object.h */
#define FLAG_LINK (1u<<20)
#define FLAG_CHECKED (1u<<21)
struct ofs_delta_entry {
off_t offset;
int obj_no;
};
struct ref_delta_entry {
struct object_id oid;
int obj_no;
};
static struct object_entry *objects;
static struct object_stat *obj_stat;
static struct ofs_delta_entry *ofs_deltas;
static struct ref_delta_entry *ref_deltas;
static struct thread_local nothread_data;
static int nr_objects;
static int nr_ofs_deltas;
static int nr_ref_deltas;
static int ref_deltas_alloc;
static int nr_resolved_deltas;
static int nr_threads;
static int from_stdin;
static int strict;
static int do_fsck_object;
static struct fsck_options fsck_options = FSCK_OPTIONS_STRICT;
static int verbose;
static int show_resolving_progress;
static int show_stat;
static int check_self_contained_and_connected;
static struct progress *progress;
/* We always read in 4kB chunks. */
static unsigned char input_buffer[4096];
static unsigned int input_offset, input_len;
static off_t consumed_bytes;
static off_t max_input_size;
static unsigned deepest_delta;
static git_hash_ctx input_ctx;
static uint32_t input_crc32;
static int input_fd, output_fd;
static const char *curr_pack;
static struct thread_local *thread_data;
static int nr_dispatched;
static int threads_active;
static pthread_mutex_t read_mutex;
#define read_lock() lock_mutex(&read_mutex)
#define read_unlock() unlock_mutex(&read_mutex)
static pthread_mutex_t counter_mutex;
#define counter_lock() lock_mutex(&counter_mutex)
#define counter_unlock() unlock_mutex(&counter_mutex)
static pthread_mutex_t work_mutex;
#define work_lock() lock_mutex(&work_mutex)
#define work_unlock() unlock_mutex(&work_mutex)
static pthread_mutex_t deepest_delta_mutex;
#define deepest_delta_lock() lock_mutex(&deepest_delta_mutex)
#define deepest_delta_unlock() unlock_mutex(&deepest_delta_mutex)
static pthread_mutex_t type_cas_mutex;
#define type_cas_lock() lock_mutex(&type_cas_mutex)
#define type_cas_unlock() unlock_mutex(&type_cas_mutex)
static pthread_key_t key;
static inline void lock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_lock(mutex);
}
static inline void unlock_mutex(pthread_mutex_t *mutex)
{
if (threads_active)
pthread_mutex_unlock(mutex);
}
/*
* Mutex and conditional variable can't be statically-initialized on Windows.
*/
static void init_thread(void)
{
int i;
init_recursive_mutex(&read_mutex);
pthread_mutex_init(&counter_mutex, NULL);
pthread_mutex_init(&work_mutex, NULL);
pthread_mutex_init(&type_cas_mutex, NULL);
if (show_stat)
pthread_mutex_init(&deepest_delta_mutex, NULL);
pthread_key_create(&key, NULL);
thread_data = xcalloc(nr_threads, sizeof(*thread_data));
for (i = 0; i < nr_threads; i++) {
thread_data[i].pack_fd = open(curr_pack, O_RDONLY);
if (thread_data[i].pack_fd == -1)
die_errno(_("unable to open %s"), curr_pack);
}
threads_active = 1;
}
static void cleanup_thread(void)
{
int i;
if (!threads_active)
return;
threads_active = 0;
pthread_mutex_destroy(&read_mutex);
pthread_mutex_destroy(&counter_mutex);
pthread_mutex_destroy(&work_mutex);
pthread_mutex_destroy(&type_cas_mutex);
if (show_stat)
pthread_mutex_destroy(&deepest_delta_mutex);
for (i = 0; i < nr_threads; i++)
close(thread_data[i].pack_fd);
pthread_key_delete(key);
free(thread_data);
}
static int mark_link(struct object *obj, int type, void *data, struct fsck_options *options)
{
if (!obj)
return -1;
if (type != OBJ_ANY && obj->type != type)
die(_("object type mismatch at %s"), oid_to_hex(&obj->oid));
obj->flags |= FLAG_LINK;
return 0;
}
/* The content of each linked object must have been checked
or it must be already present in the object database */
static unsigned check_object(struct object *obj)
{
if (!obj)
return 0;
if (!(obj->flags & FLAG_LINK))
return 0;
if (!(obj->flags & FLAG_CHECKED)) {
unsigned long size;
int type = oid_object_info(the_repository, &obj->oid, &size);
if (type <= 0)
die(_("did not receive expected object %s"),
oid_to_hex(&obj->oid));
if (type != obj->type)
die(_("object %s: expected type %s, found %s"),
oid_to_hex(&obj->oid),
type_name(obj->type), type_name(type));
obj->flags |= FLAG_CHECKED;
return 1;
}
return 0;
}
static unsigned check_objects(void)
{
unsigned i, max, foreign_nr = 0;
max = get_max_object_index();
if (verbose)
progress = start_delayed_progress(_("Checking objects"), max);
for (i = 0; i < max; i++) {
foreign_nr += check_object(get_indexed_object(i));
display_progress(progress, i + 1);
}
stop_progress(&progress);
return foreign_nr;
}
/* Discard current buffer used content. */
static void flush(void)
{
if (input_offset) {
if (output_fd >= 0)
write_or_die(output_fd, input_buffer, input_offset);
the_hash_algo->update_fn(&input_ctx, input_buffer, input_offset);
memmove(input_buffer, input_buffer + input_offset, input_len);
input_offset = 0;
}
}
/*
* Make sure at least "min" bytes are available in the buffer, and
* return the pointer to the buffer.
*/
static void *fill(int min)
{
if (min <= input_len)
return input_buffer + input_offset;
if (min > sizeof(input_buffer))
die(Q_("cannot fill %d byte",
"cannot fill %d bytes",
min),
min);
flush();
do {
ssize_t ret = xread(input_fd, input_buffer + input_len,
sizeof(input_buffer) - input_len);
if (ret <= 0) {
if (!ret)
die(_("early EOF"));
die_errno(_("read error on input"));
}
input_len += ret;
if (from_stdin)
display_throughput(progress, consumed_bytes + input_len);
} while (input_len < min);
return input_buffer;
}
static void use(int bytes)
{
if (bytes > input_len)
die(_("used more bytes than were available"));
input_crc32 = crc32(input_crc32, input_buffer + input_offset, bytes);
input_len -= bytes;
input_offset += bytes;
/* make sure off_t is sufficiently large not to wrap */
if (signed_add_overflows(consumed_bytes, bytes))
die(_("pack too large for current definition of off_t"));
consumed_bytes += bytes;
if (max_input_size && consumed_bytes > max_input_size)
die(_("pack exceeds maximum allowed size"));
}
static const char *open_pack_file(const char *pack_name)
{
if (from_stdin) {
input_fd = 0;
if (!pack_name) {
struct strbuf tmp_file = STRBUF_INIT;
output_fd = odb_mkstemp(&tmp_file,
"pack/tmp_pack_XXXXXX");
pack_name = strbuf_detach(&tmp_file, NULL);
} else {
output_fd = open(pack_name, O_CREAT|O_EXCL|O_RDWR, 0600);
if (output_fd < 0)
die_errno(_("unable to create '%s'"), pack_name);
}
nothread_data.pack_fd = output_fd;
} else {
input_fd = open(pack_name, O_RDONLY);
if (input_fd < 0)
die_errno(_("cannot open packfile '%s'"), pack_name);
output_fd = -1;
nothread_data.pack_fd = input_fd;
}
the_hash_algo->init_fn(&input_ctx);
return pack_name;
}
static void parse_pack_header(void)
{
struct pack_header *hdr = fill(sizeof(struct pack_header));
/* Header consistency check */
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
die(_("pack signature mismatch"));
if (!pack_version_ok(hdr->hdr_version))
die(_("pack version %"PRIu32" unsupported"),
ntohl(hdr->hdr_version));
nr_objects = ntohl(hdr->hdr_entries);
use(sizeof(struct pack_header));
}
static NORETURN void bad_object(off_t offset, const char *format,
...) __attribute__((format (printf, 2, 3)));
static NORETURN void bad_object(off_t offset, const char *format, ...)
{
va_list params;
char buf[1024];
va_start(params, format);
vsnprintf(buf, sizeof(buf), format, params);
va_end(params);
die(_("pack has bad object at offset %"PRIuMAX": %s"),
(uintmax_t)offset, buf);
}
static inline struct thread_local *get_thread_data(void)
{
if (HAVE_THREADS) {
if (threads_active)
return pthread_getspecific(key);
assert(!threads_active &&
"This should only be reached when all threads are gone");
}
return ¬hread_data;
}
static void set_thread_data(struct thread_local *data)
{
if (threads_active)
pthread_setspecific(key, data);
}
static struct base_data *alloc_base_data(void)
{
struct base_data *base = xcalloc(1, sizeof(struct base_data));
base->ref_last = -1;
base->ofs_last = -1;
return base;
}
static void free_base_data(struct base_data *c)
{
if (c->data) {
FREE_AND_NULL(c->data);
get_thread_data()->base_cache_used -= c->size;
}
}
static void prune_base_data(struct base_data *retain)
{
struct base_data *b;
struct thread_local *data = get_thread_data();
for (b = data->base_cache;
data->base_cache_used > delta_base_cache_limit && b;
b = b->child) {
if (b->data && b != retain)
free_base_data(b);
}
}
static void link_base_data(struct base_data *base, struct base_data *c)
{
if (base)
base->child = c;
else
get_thread_data()->base_cache = c;
c->base = base;
c->child = NULL;
if (c->data)
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
static void unlink_base_data(struct base_data *c)
{
struct base_data *base = c->base;
if (base)
base->child = NULL;
else
get_thread_data()->base_cache = NULL;
free_base_data(c);
}
static int is_delta_type(enum object_type type)
{
return (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA);
}
static void *unpack_entry_data(off_t offset, unsigned long size,
enum object_type type, struct object_id *oid)
{
static char fixed_buf[8192];
int status;
git_zstream stream;
void *buf;
git_hash_ctx c;
char hdr[32];
int hdrlen;
if (!is_delta_type(type)) {
hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX,
type_name(type),(uintmax_t)size) + 1;
the_hash_algo->init_fn(&c);
the_hash_algo->update_fn(&c, hdr, hdrlen);
} else
oid = NULL;
if (type == OBJ_BLOB && size > big_file_threshold)
buf = fixed_buf;
else
buf = xmallocz(size);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = buf;
stream.avail_out = buf == fixed_buf ? sizeof(fixed_buf) : size;
do {
unsigned char *last_out = stream.next_out;
stream.next_in = fill(1);
stream.avail_in = input_len;
status = git_inflate(&stream, 0);
use(input_len - stream.avail_in);
if (oid)
the_hash_algo->update_fn(&c, last_out, stream.next_out - last_out);
if (buf == fixed_buf) {
stream.next_out = buf;
stream.avail_out = sizeof(fixed_buf);
}
} while (status == Z_OK);
if (stream.total_out != size || status != Z_STREAM_END)
bad_object(offset, _("inflate returned %d"), status);
git_inflate_end(&stream);
if (oid)
the_hash_algo->final_fn(oid->hash, &c);
return buf == fixed_buf ? NULL : buf;
}
static void *unpack_raw_entry(struct object_entry *obj,
off_t *ofs_offset,
struct object_id *ref_oid,
struct object_id *oid)
{
unsigned char *p;
unsigned long size, c;
off_t base_offset;
unsigned shift;
void *data;
obj->idx.offset = consumed_bytes;
input_crc32 = crc32(0, NULL, 0);
p = fill(1);
c = *p;
use(1);
obj->type = (c >> 4) & 7;
size = (c & 15);
shift = 4;
while (c & 0x80) {
p = fill(1);
c = *p;
use(1);
size += (c & 0x7f) << shift;
shift += 7;
}
obj->size = size;
switch (obj->type) {
case OBJ_REF_DELTA:
hashcpy(ref_oid->hash, fill(the_hash_algo->rawsz));
use(the_hash_algo->rawsz);
break;
case OBJ_OFS_DELTA:
p = fill(1);
c = *p;
use(1);
base_offset = c & 127;
while (c & 128) {
base_offset += 1;
if (!base_offset || MSB(base_offset, 7))
bad_object(obj->idx.offset, _("offset value overflow for delta base object"));
p = fill(1);
c = *p;
use(1);
base_offset = (base_offset << 7) + (c & 127);
}
*ofs_offset = obj->idx.offset - base_offset;
if (*ofs_offset <= 0 || *ofs_offset >= obj->idx.offset)
bad_object(obj->idx.offset, _("delta base offset is out of bound"));
break;
case OBJ_COMMIT:
case OBJ_TREE:
case OBJ_BLOB:
case OBJ_TAG:
break;
default:
bad_object(obj->idx.offset, _("unknown object type %d"), obj->type);
}
obj->hdr_size = consumed_bytes - obj->idx.offset;
data = unpack_entry_data(obj->idx.offset, obj->size, obj->type, oid);
obj->idx.crc32 = input_crc32;
return data;
}
static void *unpack_data(struct object_entry *obj,
int (*consume)(const unsigned char *, unsigned long, void *),
void *cb_data)
{
off_t from = obj[0].idx.offset + obj[0].hdr_size;
off_t len = obj[1].idx.offset - from;
unsigned char *data, *inbuf;
git_zstream stream;
int status;
data = xmallocz(consume ? 64*1024 : obj->size);
inbuf = xmalloc((len < 64*1024) ? (int)len : 64*1024);
memset(&stream, 0, sizeof(stream));
git_inflate_init(&stream);
stream.next_out = data;
stream.avail_out = consume ? 64*1024 : obj->size;
do {
ssize_t n = (len < 64*1024) ? (ssize_t)len : 64*1024;
n = xpread(get_thread_data()->pack_fd, inbuf, n, from);
if (n < 0)
die_errno(_("cannot pread pack file"));
if (!n)
die(Q_("premature end of pack file, %"PRIuMAX" byte missing",
"premature end of pack file, %"PRIuMAX" bytes missing",
(unsigned int)len),
(uintmax_t)len);
from += n;
len -= n;
stream.next_in = inbuf;
stream.avail_in = n;
if (!consume)
status = git_inflate(&stream, 0);
else {
do {
status = git_inflate(&stream, 0);
if (consume(data, stream.next_out - data, cb_data)) {
free(inbuf);
free(data);
return NULL;
}
stream.next_out = data;
stream.avail_out = 64*1024;
} while (status == Z_OK && stream.avail_in);
}
} while (len && status == Z_OK && !stream.avail_in);
/* This has been inflated OK when first encountered, so... */
if (status != Z_STREAM_END || stream.total_out != obj->size)
die(_("serious inflate inconsistency"));
git_inflate_end(&stream);
free(inbuf);
if (consume) {
FREE_AND_NULL(data);
}
return data;
}
static void *get_data_from_pack(struct object_entry *obj)
{
return unpack_data(obj, NULL, NULL);
}
static int compare_ofs_delta_bases(off_t offset1, off_t offset2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return offset1 < offset2 ? -1 :
offset1 > offset2 ? 1 :
0;
}
static int find_ofs_delta(const off_t offset, enum object_type type)
{
int first = 0, last = nr_ofs_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ofs_delta_entry *delta = &ofs_deltas[next];
int cmp;
cmp = compare_ofs_delta_bases(offset, delta->offset,
type, objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ofs_delta_children(off_t offset,
int *first_index, int *last_index,
enum object_type type)
{
int first = find_ofs_delta(offset, type);
int last = first;
int end = nr_ofs_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && ofs_deltas[first - 1].offset == offset)
--first;
while (last < end && ofs_deltas[last + 1].offset == offset)
++last;
*first_index = first;
*last_index = last;
}
static int compare_ref_delta_bases(const struct object_id *oid1,
const struct object_id *oid2,
enum object_type type1,
enum object_type type2)
{
int cmp = type1 - type2;
if (cmp)
return cmp;
return oidcmp(oid1, oid2);
}
static int find_ref_delta(const struct object_id *oid, enum object_type type)
{
int first = 0, last = nr_ref_deltas;
while (first < last) {
int next = first + (last - first) / 2;
struct ref_delta_entry *delta = &ref_deltas[next];
int cmp;
cmp = compare_ref_delta_bases(oid, &delta->oid,
type, objects[delta->obj_no].type);
if (!cmp)
return next;
if (cmp < 0) {
last = next;
continue;
}
first = next+1;
}
return -first-1;
}
static void find_ref_delta_children(const struct object_id *oid,
int *first_index, int *last_index,
enum object_type type)
{
int first = find_ref_delta(oid, type);
int last = first;
int end = nr_ref_deltas - 1;
if (first < 0) {
*first_index = 0;
*last_index = -1;
return;
}
while (first > 0 && oideq(&ref_deltas[first - 1].oid, oid))
--first;
while (last < end && oideq(&ref_deltas[last + 1].oid, oid))
++last;
*first_index = first;
*last_index = last;
}
struct compare_data {
struct object_entry *entry;
struct git_istream *st;
unsigned char *buf;
unsigned long buf_size;
};
static int compare_objects(const unsigned char *buf, unsigned long size,
void *cb_data)
{
struct compare_data *data = cb_data;
if (data->buf_size < size) {
free(data->buf);
data->buf = xmalloc(size);
data->buf_size = size;
}
while (size) {
ssize_t len = read_istream(data->st, data->buf, size);
if (len == 0)
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&data->entry->idx.oid));
if (len < 0)
die(_("unable to read %s"),
oid_to_hex(&data->entry->idx.oid));
if (memcmp(buf, data->buf, len))
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&data->entry->idx.oid));
size -= len;
buf += len;
}
return 0;
}
static int check_collison(struct object_entry *entry)
{
struct compare_data data;
enum object_type type;
unsigned long size;
if (entry->size <= big_file_threshold || entry->type != OBJ_BLOB)
return -1;
memset(&data, 0, sizeof(data));
data.entry = entry;
data.st = open_istream(the_repository, &entry->idx.oid, &type, &size,
NULL);
if (!data.st)
return -1;
if (size != entry->size || type != entry->type)
die(_("SHA1 COLLISION FOUND WITH %s !"),
oid_to_hex(&entry->idx.oid));
unpack_data(entry, compare_objects, &data);
close_istream(data.st);
free(data.buf);
return 0;
}
static void sha1_object(const void *data, struct object_entry *obj_entry,
unsigned long size, enum object_type type,
const struct object_id *oid)
{
void *new_data = NULL;
int collision_test_needed = 0;
assert(data || obj_entry);
if (startup_info->have_repository) {
read_lock();
collision_test_needed =
has_object_file_with_flags(oid, OBJECT_INFO_QUICK);
read_unlock();
}
if (collision_test_needed && !data) {
read_lock();
if (!check_collison(obj_entry))
collision_test_needed = 0;
read_unlock();
}
if (collision_test_needed) {
void *has_data;
enum object_type has_type;
unsigned long has_size;
read_lock();
has_type = oid_object_info(the_repository, oid, &has_size);
if (has_type < 0)
die(_("cannot read existing object info %s"), oid_to_hex(oid));
if (has_type != type || has_size != size)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
has_data = read_object_file(oid, &has_type, &has_size);
read_unlock();
if (!data)
data = new_data = get_data_from_pack(obj_entry);
if (!has_data)
die(_("cannot read existing object %s"), oid_to_hex(oid));
if (size != has_size || type != has_type ||
memcmp(data, has_data, size) != 0)
die(_("SHA1 COLLISION FOUND WITH %s !"), oid_to_hex(oid));
free(has_data);
}
if (strict || do_fsck_object) {
read_lock();
if (type == OBJ_BLOB) {
struct blob *blob = lookup_blob(the_repository, oid);
if (blob)
blob->object.flags |= FLAG_CHECKED;
else
die(_("invalid blob object %s"), oid_to_hex(oid));
if (do_fsck_object &&
fsck_object(&blob->object, (void *)data, size, &fsck_options))
die(_("fsck error in packed object"));
} else {
struct object *obj;
int eaten;
void *buf = (void *) data;
assert(data && "data can only be NULL for large _blobs_");
/*
* we do not need to free the memory here, as the
* buf is deleted by the caller.
*/
obj = parse_object_buffer(the_repository, oid, type,
size, buf,
&eaten);
if (!obj)
die(_("invalid %s"), type_name(type));
if (do_fsck_object &&
fsck_object(obj, buf, size, &fsck_options))
die(_("fsck error in packed object"));
if (strict && fsck_walk(obj, NULL, &fsck_options))
die(_("Not all child objects of %s are reachable"), oid_to_hex(&obj->oid));
if (obj->type == OBJ_TREE) {
struct tree *item = (struct tree *) obj;
item->buffer = NULL;
obj->parsed = 0;
}
if (obj->type == OBJ_COMMIT) {
struct commit *commit = (struct commit *) obj;
if (detach_commit_buffer(commit, NULL) != data)
BUG("parse_object_buffer transmogrified our buffer");
}
obj->flags |= FLAG_CHECKED;
}
read_unlock();
}
free(new_data);
}
/*
* This function is part of find_unresolved_deltas(). There are two
* walkers going in the opposite ways.
*
* The first one in find_unresolved_deltas() traverses down from
* parent node to children, deflating nodes along the way. However,
* memory for deflated nodes is limited by delta_base_cache_limit, so
* at some point parent node's deflated content may be freed.
*
* The second walker is this function, which goes from current node up
* to top parent if necessary to deflate the node. In normal
* situation, its parent node would be already deflated, so it just
* needs to apply delta.
*
* In the worst case scenario, parent node is no longer deflated because
* we're running out of delta_base_cache_limit; we need to re-deflate
* parents, possibly up to the top base.
*
* All deflated objects here are subject to be freed if we exceed
* delta_base_cache_limit, just like in find_unresolved_deltas(), we
* just need to make sure the last node is not freed.
*/
static void *get_base_data(struct base_data *c)
{
if (!c->data) {
struct object_entry *obj = c->obj;
struct base_data **delta = NULL;
int delta_nr = 0, delta_alloc = 0;
while (is_delta_type(c->obj->type) && !c->data) {
ALLOC_GROW(delta, delta_nr + 1, delta_alloc);
delta[delta_nr++] = c;
c = c->base;
}
if (!delta_nr) {
c->data = get_data_from_pack(obj);
c->size = obj->size;
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
for (; delta_nr > 0; delta_nr--) {
void *base, *raw;
c = delta[delta_nr - 1];
obj = c->obj;
base = get_base_data(c->base);
raw = get_data_from_pack(obj);
c->data = patch_delta(
base, c->base->size,
raw, obj->size,
&c->size);
free(raw);
if (!c->data)
bad_object(obj->idx.offset, _("failed to apply delta"));
get_thread_data()->base_cache_used += c->size;
prune_base_data(c);
}
free(delta);
}
return c->data;
}
static void resolve_delta(struct object_entry *delta_obj,
struct base_data *base, struct base_data *result)
{
void *base_data, *delta_data;
if (show_stat) {
int i = delta_obj - objects;
int j = base->obj - objects;
obj_stat[i].delta_depth = obj_stat[j].delta_depth + 1;
deepest_delta_lock();
if (deepest_delta < obj_stat[i].delta_depth)
deepest_delta = obj_stat[i].delta_depth;
deepest_delta_unlock();
obj_stat[i].base_object_no = j;
}
delta_data = get_data_from_pack(delta_obj);
base_data = get_base_data(base);
result->obj = delta_obj;
result->data = patch_delta(base_data, base->size,
delta_data, delta_obj->size, &result->size);
free(delta_data);
if (!result->data)
bad_object(delta_obj->idx.offset, _("failed to apply delta"));
hash_object_file(the_hash_algo, result->data, result->size,
type_name(delta_obj->real_type), &delta_obj->idx.oid);
sha1_object(result->data, NULL, result->size, delta_obj->real_type,
&delta_obj->idx.oid);
counter_lock();
nr_resolved_deltas++;
counter_unlock();
}
/*
* Standard boolean compare-and-swap: atomically check whether "*type" is
* "want"; if so, swap in "set" and return true. Otherwise, leave it untouched
* and return false.
*/
static int compare_and_swap_type(signed char *type,
enum object_type want,
enum object_type set)
{
enum object_type old;
type_cas_lock();
old = *type;
if (old == want)
*type = set;
type_cas_unlock();
return old == want;
}
static struct base_data *find_unresolved_deltas_1(struct base_data *base,
struct base_data *prev_base)
{
if (base->ref_last == -1 && base->ofs_last == -1) {
find_ref_delta_children(&base->obj->idx.oid,
&base->ref_first, &base->ref_last,
OBJ_REF_DELTA);
find_ofs_delta_children(base->obj->idx.offset,
&base->ofs_first, &base->ofs_last,
OBJ_OFS_DELTA);
if (base->ref_last == -1 && base->ofs_last == -1) {
free(base->data);
return NULL;
}
link_base_data(prev_base, base);
}