Repository navigation
Expand file tree
/
Copy pathcache-tree.c
More file actions
1057 lines (928 loc) · 25.9 KB
/
Copy pathcache-tree.c
File metadata and controls
1057 lines (928 loc) · 25.9 KB
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
#define USE_THE_REPOSITORY_VARIABLE
#define DISABLE_SIGN_COMPARE_WARNINGS
#include "git-compat-util.h"
#include "gettext.h"
#include "hex.h"
#include "lockfile.h"
#include "tree.h"
#include "tree-walk.h"
#include "cache-tree.h"
#include "object-file.h"
#include "odb.h"
#include "read-cache-ll.h"
#include "replace-object.h"
#include "repository.h"
#include "promisor-remote.h"
#include "trace.h"
#include "trace2.h"
#ifndef DEBUG_CACHE_TREE
#define DEBUG_CACHE_TREE 0
#endif
struct cache_tree *cache_tree(void)
{
struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree));
it->entry_count = -1;
return it;
}
void cache_tree_free(struct cache_tree **it_p)
{
int i;
struct cache_tree *it = *it_p;
if (!it)
return;
for (i = 0; i < it->subtree_nr; i++)
if (it->down[i]) {
cache_tree_free(&it->down[i]->cache_tree);
free(it->down[i]);
}
free(it->down);
free(it);
*it_p = NULL;
}
static int subtree_name_cmp(const char *one, int onelen,
const char *two, int twolen)
{
if (onelen < twolen)
return -1;
if (twolen < onelen)
return 1;
return memcmp(one, two, onelen);
}
int cache_tree_subtree_pos(struct cache_tree *it, const char *path, int pathlen)
{
struct cache_tree_sub **down = it->down;
int lo, hi;
lo = 0;
hi = it->subtree_nr;
while (lo < hi) {
int mi = lo + (hi - lo) / 2;
struct cache_tree_sub *mdl = down[mi];
int cmp = subtree_name_cmp(path, pathlen,
mdl->name, mdl->namelen);
if (!cmp)
return mi;
if (cmp < 0)
hi = mi;
else
lo = mi + 1;
}
return -lo-1;
}
static struct cache_tree_sub *find_subtree(struct cache_tree *it,
const char *path,
int pathlen,
int create)
{
struct cache_tree_sub *down;
int pos = cache_tree_subtree_pos(it, path, pathlen);
if (0 <= pos)
return it->down[pos];
if (!create)
return NULL;
pos = -pos-1;
ALLOC_GROW(it->down, it->subtree_nr + 1, it->subtree_alloc);
it->subtree_nr++;
FLEX_ALLOC_MEM(down, name, path, pathlen);
down->cache_tree = NULL;
down->namelen = pathlen;
if (pos < it->subtree_nr)
MOVE_ARRAY(it->down + pos + 1, it->down + pos,
it->subtree_nr - pos - 1);
it->down[pos] = down;
return down;
}
struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
{
int pathlen = strlen(path);
return find_subtree(it, path, pathlen, 1);
}
static int do_invalidate_path(struct cache_tree *it, const char *path)
{
/* a/b/c
* ==> invalidate self
* ==> find "a", have it invalidate "b/c"
* a
* ==> invalidate self
* ==> if "a" exists as a subtree, remove it.
*/
const char *slash;
int namelen;
struct cache_tree_sub *down;
#if DEBUG_CACHE_TREE
fprintf(stderr, "cache-tree invalidate <%s>\n", path);
#endif
if (!it)
return 0;
slash = strchrnul(path, '/');
namelen = slash - path;
it->entry_count = -1;
if (!*slash) {
int pos;
pos = cache_tree_subtree_pos(it, path, namelen);
if (0 <= pos) {
cache_tree_free(&it->down[pos]->cache_tree);
free(it->down[pos]);
/* 0 1 2 3 4 5
* ^ ^subtree_nr = 6
* pos
* move 4 and 5 up one place (2 entries)
* 2 = 6 - 3 - 1 = subtree_nr - pos - 1
*/
MOVE_ARRAY(it->down + pos, it->down + pos + 1,
it->subtree_nr - pos - 1);
it->subtree_nr--;
}
return 1;
}
down = find_subtree(it, path, namelen, 0);
if (down)
do_invalidate_path(down->cache_tree, slash + 1);
return 1;
}
void cache_tree_invalidate_path(struct index_state *istate, const char *path)
{
if (do_invalidate_path(istate->cache_tree, path))
istate->cache_changed |= CACHE_TREE_CHANGED;
}
static int verify_cache(struct index_state *istate, int flags)
{
unsigned i, funny;
int silent = flags & WRITE_TREE_SILENT;
/* Verify that the tree is merged */
funny = 0;
for (i = 0; i < istate->cache_nr; i++) {
const struct cache_entry *ce = istate->cache[i];
if (ce_stage(ce)) {
if (silent)
return -1;
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "%s: unmerged (%s)\n",
ce->name, oid_to_hex(&ce->oid));
}
}
if (funny)
return -1;
/* Also verify that the cache does not have path and path/file
* at the same time. At this point we know the cache has only
* stage 0 entries.
*/
funny = 0;
for (i = 0; i + 1 < istate->cache_nr; i++) {
/* path/file always comes after path because of the way
* the cache is sorted. Also path can appear only once,
* which means conflicting one would immediately follow.
*/
const struct cache_entry *this_ce = istate->cache[i];
const struct cache_entry *next_ce = istate->cache[i + 1];
const char *this_name = this_ce->name;
const char *next_name = next_ce->name;
int this_len = ce_namelen(this_ce);
if (this_len < ce_namelen(next_ce) &&
next_name[this_len] == '/' &&
strncmp(this_name, next_name, this_len) == 0) {
if (10 < ++funny) {
fprintf(stderr, "...\n");
break;
}
fprintf(stderr, "You have both %s and %s\n",
this_name, next_name);
}
}
if (funny)
return -1;
return 0;
}
static void discard_unused_subtrees(struct cache_tree *it)
{
struct cache_tree_sub **down = it->down;
int nr = it->subtree_nr;
int dst, src;
for (dst = src = 0; src < nr; src++) {
struct cache_tree_sub *s = down[src];
if (s->used)
down[dst++] = s;
else {
cache_tree_free(&s->cache_tree);
free(s);
it->subtree_nr--;
}
}
}
int cache_tree_fully_valid(struct cache_tree *it)
{
int i;
if (!it)
return 0;
if (it->entry_count < 0 ||
odb_has_object(the_repository->objects, &it->oid,
HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR))
return 0;
for (i = 0; i < it->subtree_nr; i++) {
if (!cache_tree_fully_valid(it->down[i]->cache_tree))
return 0;
}
return 1;
}
static int must_check_existence(const struct cache_entry *ce)
{
return !(repo_has_promisor_remote(the_repository) && ce_skip_worktree(ce));
}
static int update_one(struct cache_tree *it,
struct cache_entry **cache,
int entries,
const char *base,
int baselen,
int *skip_count,
int flags)
{
struct strbuf buffer;
int missing_ok = flags & WRITE_TREE_MISSING_OK;
int dryrun = flags & WRITE_TREE_DRY_RUN;
int repair = flags & WRITE_TREE_REPAIR;
int to_invalidate = 0;
int i;
assert(!(dryrun && repair));
*skip_count = 0;
/*
* If the first entry of this region is a sparse directory
* entry corresponding exactly to 'base', then this cache_tree
* struct is a "leaf" in the data structure, pointing to the
* tree OID specified in the entry.
*/
if (entries > 0) {
const struct cache_entry *ce = cache[0];
if (S_ISSPARSEDIR(ce->ce_mode) &&
ce->ce_namelen == baselen &&
!strncmp(ce->name, base, baselen)) {
it->entry_count = 1;
oidcpy(&it->oid, &ce->oid);
return 1;
}
}
if (0 <= it->entry_count &&
odb_has_object(the_repository->objects, &it->oid,
HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR))
return it->entry_count;
/*
* We first scan for subtrees and update them; we start by
* marking existing subtrees -- the ones that are unmarked
* should not be in the result.
*/
for (i = 0; i < it->subtree_nr; i++)
it->down[i]->used = 0;
/*
* Find the subtrees and update them.
*/
i = 0;
while (i < entries) {
const struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub;
const char *path, *slash;
int pathlen, sublen, subcnt, subskip;
path = ce->name;
pathlen = ce_namelen(ce);
if (pathlen <= baselen || memcmp(base, path, baselen))
break; /* at the end of this level */
slash = strchr(path + baselen, '/');
if (!slash) {
i++;
continue;
}
/*
* a/bbb/c (base = a/, slash = /c)
* ==>
* path+baselen = bbb/c, sublen = 3
*/
sublen = slash - (path + baselen);
sub = find_subtree(it, path + baselen, sublen, 1);
if (!sub->cache_tree)
sub->cache_tree = cache_tree();
subcnt = update_one(sub->cache_tree,
cache + i, entries - i,
path,
baselen + sublen + 1,
&subskip,
flags);
if (subcnt < 0)
return subcnt;
if (!subcnt)
die("index cache-tree records empty sub-tree");
i += subcnt;
sub->count = subcnt; /* to be used in the next loop */
*skip_count += subskip;
sub->used = 1;
}
discard_unused_subtrees(it);
/*
* Then write out the tree object for this level.
*/
strbuf_init(&buffer, 8192);
i = 0;
while (i < entries) {
const struct cache_entry *ce = cache[i];
struct cache_tree_sub *sub = NULL;
const char *path, *slash;
int pathlen, entlen;
const struct object_id *oid;
unsigned mode;
int expected_missing = 0;
int contains_ita = 0;
int ce_missing_ok;
path = ce->name;
pathlen = ce_namelen(ce);
if (pathlen <= baselen || memcmp(base, path, baselen))
break; /* at the end of this level */
slash = strchr(path + baselen, '/');
if (slash) {
entlen = slash - (path + baselen);
sub = find_subtree(it, path + baselen, entlen, 0);
if (!sub)
die("cache-tree.c: '%.*s' in '%s' not found",
entlen, path + baselen, path);
i += sub->count;
oid = &sub->cache_tree->oid;
mode = S_IFDIR;
contains_ita = sub->cache_tree->entry_count < 0;
if (contains_ita) {
to_invalidate = 1;
expected_missing = 1;
}
}
else {
oid = &ce->oid;
mode = ce->ce_mode;
entlen = pathlen - baselen;
i++;
}
ce_missing_ok = mode == S_IFGITLINK || missing_ok ||
!must_check_existence(ce);
if (is_null_oid(oid) ||
(!ce_missing_ok &&
!odb_has_object(the_repository->objects, oid,
HAS_OBJECT_RECHECK_PACKED | HAS_OBJECT_FETCH_PROMISOR))) {
strbuf_release(&buffer);
if (expected_missing)
return -1;
return error("invalid object %06o %s for '%.*s'",
mode, oid_to_hex(oid), entlen+baselen, path);
}
/*
* CE_REMOVE entries are removed before the index is
* written to disk. Skip them to remain consistent
* with the future on-disk index.
*/
if (ce->ce_flags & CE_REMOVE) {
*skip_count = *skip_count + 1;
continue;
}
/*
* CE_INTENT_TO_ADD entries exist in on-disk index but
* they are not part of generated trees. Invalidate up
* to root to force cache-tree users to read elsewhere.
*/
if (!sub && ce_intent_to_add(ce)) {
to_invalidate = 1;
continue;
}
/*
* "sub" can be an empty tree if all subentries are i-t-a.
*/
if (contains_ita && is_empty_tree_oid(oid, the_repository->hash_algo))
continue;
strbuf_grow(&buffer, entlen + 100);
strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
strbuf_add(&buffer, oid->hash, the_hash_algo->rawsz);
#if DEBUG_CACHE_TREE
fprintf(stderr, "cache-tree update-one %o %.*s\n",
mode, entlen, path + baselen);
#endif
}
if (repair) {
struct object_id oid;
hash_object_file(the_hash_algo, buffer.buf, buffer.len,
OBJ_TREE, &oid);
if (odb_has_object(the_repository->objects, &oid, HAS_OBJECT_RECHECK_PACKED))
oidcpy(&it->oid, &oid);
else
to_invalidate = 1;
} else if (dryrun) {
hash_object_file(the_hash_algo, buffer.buf, buffer.len,
OBJ_TREE, &it->oid);
} else if (odb_write_object_ext(the_repository->objects, buffer.buf, buffer.len, OBJ_TREE,
&it->oid, NULL, flags & WRITE_TREE_SILENT ? WRITE_OBJECT_SILENT : 0)) {
strbuf_release(&buffer);
return -1;
}
strbuf_release(&buffer);
it->entry_count = to_invalidate ? -1 : i - *skip_count;
#if DEBUG_CACHE_TREE
fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
it->entry_count, it->subtree_nr,
oid_to_hex(&it->oid));
#endif
return i;
}
int cache_tree_update(struct index_state *istate, int flags)
{
struct odb_transaction *transaction;
int skip, i;
i = verify_cache(istate, flags);
if (i)
return i;
if (!istate->cache_tree)
istate->cache_tree = cache_tree();
if (!(flags & WRITE_TREE_MISSING_OK) && repo_has_promisor_remote(the_repository))
prefetch_cache_entries(istate, must_check_existence);
trace_performance_enter();
trace2_region_enter("cache_tree", "update", the_repository);
transaction = odb_transaction_begin(the_repository->objects);
i = update_one(istate->cache_tree, istate->cache, istate->cache_nr,
"", 0, &skip, flags);
odb_transaction_commit(transaction);
trace2_region_leave("cache_tree", "update", the_repository);
trace_performance_leave("cache_tree_update");
if (i < 0)
return i;
istate->cache_changed |= CACHE_TREE_CHANGED;
return 0;
}
static void write_one(struct strbuf *buffer, struct cache_tree *it,
const char *path, int pathlen)
{
int i;
/* One "cache-tree" entry consists of the following:
* path (NUL terminated)
* entry_count, subtree_nr ("%d %d\n")
* tree-sha1 (missing if invalid)
* subtree_nr "cache-tree" entries for subtrees.
*/
strbuf_grow(buffer, pathlen + 100);
strbuf_add(buffer, path, pathlen);
strbuf_addf(buffer, "%c%d %d\n", 0, it->entry_count, it->subtree_nr);
#if DEBUG_CACHE_TREE
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
pathlen, path, it->entry_count, it->subtree_nr,
oid_to_hex(&it->oid));
else
fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
pathlen, path, it->subtree_nr);
#endif
if (0 <= it->entry_count) {
strbuf_add(buffer, it->oid.hash, the_hash_algo->rawsz);
}
for (i = 0; i < it->subtree_nr; i++) {
struct cache_tree_sub *down = it->down[i];
if (i) {
struct cache_tree_sub *prev = it->down[i-1];
if (subtree_name_cmp(down->name, down->namelen,
prev->name, prev->namelen) <= 0)
die("fatal - unsorted cache subtree");
}
write_one(buffer, down->cache_tree, down->name, down->namelen);
}
}
void cache_tree_write(struct strbuf *sb, struct cache_tree *root)
{
trace2_region_enter("cache_tree", "write", the_repository);
write_one(sb, root, "", 0);
trace2_region_leave("cache_tree", "write", the_repository);
}
static int parse_int(const char **ptr, unsigned long *len_p, int *out)
{
const char *s = *ptr;
unsigned long len = *len_p;
int ret = 0;
int sign = 1;
while (len && *s == '-') {
sign *= -1;
s++;
len--;
}
while (len) {
if (!isdigit(*s))
break;
ret *= 10;
ret += *s - '0';
s++;
len--;
}
if (s == *ptr)
return -1;
*ptr = s;
*len_p = len;
*out = sign * ret;
return 0;
}
static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
{
const char *buf = *buffer;
unsigned long size = *size_p;
struct cache_tree *it;
int i, subtree_nr;
const unsigned rawsz = the_hash_algo->rawsz;
it = NULL;
/* skip name, but make sure name exists */
while (size && *buf) {
size--;
buf++;
}
if (!size)
goto free_return;
buf++; size--;
it = cache_tree();
if (parse_int(&buf, &size, &it->entry_count) < 0)
goto free_return;
if (!size || *buf != ' ')
goto free_return;
buf++; size--;
if (parse_int(&buf, &size, &subtree_nr) < 0)
goto free_return;
if (!size || *buf != '\n')
goto free_return;
buf++; size--;
if (0 <= it->entry_count) {
if (size < rawsz)
goto free_return;
oidread(&it->oid, (const unsigned char *)buf,
the_repository->hash_algo);
buf += rawsz;
size -= rawsz;
}
#if DEBUG_CACHE_TREE
if (0 <= it->entry_count)
fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
*buffer, it->entry_count, subtree_nr,
oid_to_hex(&it->oid));
else
fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n",
*buffer, subtree_nr);
#endif
/*
* Just a heuristic -- we do not add directories that often but
* we do not want to have to extend it immediately when we do,
* hence +2.
*/
it->subtree_alloc = subtree_nr + 2;
CALLOC_ARRAY(it->down, it->subtree_alloc);
for (i = 0; i < subtree_nr; i++) {
/* read each subtree */
struct cache_tree *sub;
struct cache_tree_sub *subtree;
const char *name = buf;
sub = read_one(&buf, &size);
if (!sub)
goto free_return;
subtree = cache_tree_sub(it, name);
subtree->cache_tree = sub;
}
if (subtree_nr != it->subtree_nr)
die("cache-tree: internal error");
*buffer = buf;
*size_p = size;
return it;
free_return:
cache_tree_free(&it);
return NULL;
}
struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
{
struct cache_tree *result;
if (buffer[0])
return NULL; /* not the whole tree */
trace2_region_enter("cache_tree", "read", the_repository);
result = read_one(&buffer, &size);
trace2_region_leave("cache_tree", "read", the_repository);
return result;
}
static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
{
if (!it)
return NULL;
while (*path) {
const char *slash;
struct cache_tree_sub *sub;
slash = strchrnul(path, '/');
/*
* Between path and slash is the name of the subtree
* to look for.
*/
sub = find_subtree(it, path, slash - path, 0);
if (!sub)
return NULL;
it = sub->cache_tree;
path = slash;
while (*path == '/')
path++;
}
return it;
}
static int write_index_as_tree_internal(struct object_id *oid,
struct index_state *index_state,
int cache_tree_valid,
int flags,
const char *prefix)
{
if (flags & WRITE_TREE_IGNORE_CACHE_TREE) {
cache_tree_free(&index_state->cache_tree);
cache_tree_valid = 0;
}
if (!cache_tree_valid && cache_tree_update(index_state, flags) < 0)
return WRITE_TREE_UNMERGED_INDEX;
if (prefix) {
struct cache_tree *subtree;
subtree = cache_tree_find(index_state->cache_tree, prefix);
if (!subtree)
return WRITE_TREE_PREFIX_ERROR;
oidcpy(oid, &subtree->oid);
}
else
oidcpy(oid, &index_state->cache_tree->oid);
return 0;
}
struct tree* write_in_core_index_as_tree(struct repository *repo) {
struct object_id o;
int was_valid, ret;
struct index_state *index_state = repo->index;
was_valid = index_state->cache_tree &&
cache_tree_fully_valid(index_state->cache_tree);
ret = write_index_as_tree_internal(&o, index_state, was_valid, 0, NULL);
if (ret == WRITE_TREE_UNMERGED_INDEX) {
int i;
bug("there are unmerged index entries:");
for (i = 0; i < index_state->cache_nr; i++) {
const struct cache_entry *ce = index_state->cache[i];
if (ce_stage(ce))
bug("%d %.*s", ce_stage(ce),
(int)ce_namelen(ce), ce->name);
}
BUG("unmerged index entries when writing in-core index");
}
return lookup_tree(repo, &index_state->cache_tree->oid);
}
int write_index_as_tree(struct object_id *oid, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
{
int entries, was_valid;
struct lock_file lock_file = LOCK_INIT;
int ret;
hold_lock_file_for_update(&lock_file, index_path, LOCK_DIE_ON_ERROR);
entries = read_index_from(index_state, index_path,
repo_get_git_dir(the_repository));
if (entries < 0) {
ret = WRITE_TREE_UNREADABLE_INDEX;
goto out;
}
was_valid = !(flags & WRITE_TREE_IGNORE_CACHE_TREE) &&
index_state->cache_tree &&
cache_tree_fully_valid(index_state->cache_tree);
ret = write_index_as_tree_internal(oid, index_state, was_valid, flags,
prefix);
if (!ret && !was_valid) {
write_locked_index(index_state, &lock_file, COMMIT_LOCK);
/* Not being able to write is fine -- we are only interested
* in updating the cache-tree part, and if the next caller
* ends up using the old index with unupdated cache-tree part
* it misses the work we did here, but that is just a
* performance penalty and not a big deal.
*/
}
out:
rollback_lock_file(&lock_file);
return ret;
}
static void prime_cache_tree_sparse_dir(struct cache_tree *it,
struct tree *tree)
{
oidcpy(&it->oid, &tree->object.oid);
it->entry_count = 1;
}
static void prime_cache_tree_rec(struct repository *r,
struct cache_tree *it,
struct tree *tree,
struct strbuf *tree_path)
{
struct tree_desc desc;
struct name_entry entry;
int cnt;
size_t base_path_len = tree_path->len;
oidcpy(&it->oid, &tree->object.oid);
init_tree_desc(&desc, &tree->object.oid, tree->buffer, tree->size);
cnt = 0;
while (tree_entry(&desc, &entry)) {
if (!S_ISDIR(entry.mode))
cnt++;
else {
struct cache_tree_sub *sub;
struct tree *subtree = lookup_tree(r, &entry.oid);
if (parse_tree(subtree) < 0)
exit(128);
sub = cache_tree_sub(it, entry.path);
sub->cache_tree = cache_tree();
/*
* Recursively-constructed subtree path is only needed when working
* in a sparse index (where it's used to determine whether the
* subtree is a sparse directory in the index).
*/
if (r->index->sparse_index) {
strbuf_setlen(tree_path, base_path_len);
strbuf_add(tree_path, entry.path, entry.pathlen);
strbuf_addch(tree_path, '/');
}
/*
* If a sparse index is in use, the directory being processed may be
* sparse. To confirm that, we can check whether an entry with that
* exact name exists in the index. If it does, the created subtree
* should be sparse. Otherwise, cache tree expansion should continue
* as normal.
*/
if (r->index->sparse_index &&
index_entry_exists(r->index, tree_path->buf, tree_path->len))
prime_cache_tree_sparse_dir(sub->cache_tree, subtree);
else
prime_cache_tree_rec(r, sub->cache_tree, subtree, tree_path);
cnt += sub->cache_tree->entry_count;
}
}
it->entry_count = cnt;
}
void prime_cache_tree(struct repository *r,
struct index_state *istate,
struct tree *tree)
{
struct strbuf tree_path = STRBUF_INIT;
trace2_region_enter("cache-tree", "prime_cache_tree", r);
cache_tree_free(&istate->cache_tree);
istate->cache_tree = cache_tree();
prime_cache_tree_rec(r, istate->cache_tree, tree, &tree_path);
strbuf_release(&tree_path);
istate->cache_changed |= CACHE_TREE_CHANGED;
trace2_region_leave("cache-tree", "prime_cache_tree", r);
}
/*
* find the cache_tree that corresponds to the current level without
* exploding the full path into textual form. The root of the
* cache tree is given as "root", and our current level is "info".
* (1) When at root level, info->prev is NULL, so it is "root" itself.
* (2) Otherwise, find the cache_tree that corresponds to one level
* above us, and find ourselves in there.
*/
static struct cache_tree *find_cache_tree_from_traversal(struct cache_tree *root,
struct traverse_info *info)
{
struct cache_tree *our_parent;
if (!info->prev)
return root;
our_parent = find_cache_tree_from_traversal(root, info->prev);
return cache_tree_find(our_parent, info->name);
}
int cache_tree_matches_traversal(struct cache_tree *root,
struct name_entry *ent,
struct traverse_info *info)
{
struct cache_tree *it;
it = find_cache_tree_from_traversal(root, info);
it = cache_tree_find(it, ent->path);
if (it && it->entry_count > 0 && oideq(&ent->oid, &it->oid))
return it->entry_count;
return 0;
}
static int verify_one_sparse(struct index_state *istate,
struct strbuf *path,
int pos)
{
struct cache_entry *ce = istate->cache[pos];
if (!S_ISSPARSEDIR(ce->ce_mode))
return error(_("directory '%s' is present in index, but not sparse"),
path->buf);
return 0;
}
/*
* Returns:
* 0 - Verification completed.
* 1 - Restart verification - a call to ensure_full_index() freed the cache
* tree that is being verified and verification needs to be restarted from
* the new toplevel cache tree.
* -1 - Verification failed.
*/
static int verify_one(struct repository *r,
struct index_state *istate,
struct cache_tree *it,
struct strbuf *path)
{
int i, pos, len = path->len;
struct strbuf tree_buf = STRBUF_INIT;
struct object_id new_oid;
int ret;
for (i = 0; i < it->subtree_nr; i++) {
strbuf_addf(path, "%s/", it->down[i]->name);
ret = verify_one(r, istate, it->down[i]->cache_tree, path);
if (ret)
goto out;
strbuf_setlen(path, len);
}
if (it->entry_count < 0 ||
/* no verification on tests (t7003) that replace trees */
lookup_replace_object(r, &it->oid) != &it->oid) {
ret = 0;
goto out;
}
if (path->len) {
/*
* If the index is sparse and the cache tree is not
* index_name_pos() may trigger ensure_full_index() which will
* free the tree that is being verified.
*/
int is_sparse = istate->sparse_index;
pos = index_name_pos(istate, path->buf, path->len);
if (is_sparse && !istate->sparse_index) {
ret = 1;
goto out;
}
if (pos >= 0) {
ret = verify_one_sparse(istate, path, pos);
goto out;
}
pos = -pos - 1;
} else {
pos = 0;
}
if (it->entry_count + pos > istate->cache_nr) {
ret = error(_("corrupted cache-tree has entries not present in index"));
goto out;
}
i = 0;
while (i < it->entry_count) {
struct cache_entry *ce = istate->cache[pos + i];
const char *slash;
struct cache_tree_sub *sub = NULL;
const struct object_id *oid;
const char *name;
unsigned mode;
int entlen;
if (ce->ce_flags & (CE_STAGEMASK | CE_INTENT_TO_ADD | CE_REMOVE)) {
ret = error(_("%s with flags 0x%x should not be in cache-tree"),
ce->name, ce->ce_flags);
goto out;
}
name = ce->name + path->len;
slash = strchr(name, '/');
if (slash) {
entlen = slash - name;
sub = find_subtree(it, ce->name + path->len, entlen, 0);
if (!sub || sub->cache_tree->entry_count < 0) {
ret = error(_("bad subtree '%.*s'"), entlen, name);
goto out;
}
oid = &sub->cache_tree->oid;
mode = S_IFDIR;