checkout-index: simplify locking logic
[git/git.git] / cache-tree.c
CommitLineData
74986462 1#include "cache.h"
697cc8ef 2#include "lockfile.h"
74986462 3#include "tree.h"
b9d37a54 4#include "tree-walk.h"
74986462
JH
5#include "cache-tree.h"
6
4903161f 7#ifndef DEBUG
74986462 8#define DEBUG 0
4903161f 9#endif
74986462
JH
10
11struct cache_tree *cache_tree(void)
12{
13 struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree));
14 it->entry_count = -1;
15 return it;
16}
17
bad68ec9 18void cache_tree_free(struct cache_tree **it_p)
74986462
JH
19{
20 int i;
bad68ec9 21 struct cache_tree *it = *it_p;
74986462
JH
22
23 if (!it)
24 return;
25 for (i = 0; i < it->subtree_nr; i++)
e92fa514 26 if (it->down[i]) {
61fa3097 27 cache_tree_free(&it->down[i]->cache_tree);
e92fa514
EN
28 free(it->down[i]);
29 }
74986462
JH
30 free(it->down);
31 free(it);
bad68ec9 32 *it_p = NULL;
74986462
JH
33}
34
61fa3097
JH
35static int subtree_name_cmp(const char *one, int onelen,
36 const char *two, int twolen)
37{
38 if (onelen < twolen)
39 return -1;
40 if (twolen < onelen)
41 return 1;
42 return memcmp(one, two, onelen);
43}
44
45static int subtree_pos(struct cache_tree *it, const char *path, int pathlen)
46{
47 struct cache_tree_sub **down = it->down;
48 int lo, hi;
49 lo = 0;
50 hi = it->subtree_nr;
51 while (lo < hi) {
52 int mi = (lo + hi) / 2;
53 struct cache_tree_sub *mdl = down[mi];
54 int cmp = subtree_name_cmp(path, pathlen,
55 mdl->name, mdl->namelen);
56 if (!cmp)
57 return mi;
58 if (cmp < 0)
59 hi = mi;
60 else
61 lo = mi + 1;
62 }
63 return -lo-1;
64}
65
74986462
JH
66static struct cache_tree_sub *find_subtree(struct cache_tree *it,
67 const char *path,
68 int pathlen,
69 int create)
70{
74986462 71 struct cache_tree_sub *down;
61fa3097
JH
72 int pos = subtree_pos(it, path, pathlen);
73 if (0 <= pos)
74 return it->down[pos];
74986462
JH
75 if (!create)
76 return NULL;
61fa3097
JH
77
78 pos = -pos-1;
bcc7a032 79 ALLOC_GROW(it->down, it->subtree_nr + 1, it->subtree_alloc);
61fa3097
JH
80 it->subtree_nr++;
81
96ffc06f 82 FLEX_ALLOC_MEM(down, name, path, pathlen);
61fa3097 83 down->cache_tree = NULL;
74986462 84 down->namelen = pathlen;
61fa3097
JH
85
86 if (pos < it->subtree_nr)
87 memmove(it->down + pos + 1,
88 it->down + pos,
89 sizeof(down) * (it->subtree_nr - pos - 1));
90 it->down[pos] = down;
74986462
JH
91 return down;
92}
93
7927a55d
JH
94struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path)
95{
96 int pathlen = strlen(path);
97 return find_subtree(it, path, pathlen, 1);
98}
99
a5400efe 100static int do_invalidate_path(struct cache_tree *it, const char *path)
74986462
JH
101{
102 /* a/b/c
103 * ==> invalidate self
104 * ==> find "a", have it invalidate "b/c"
105 * a
106 * ==> invalidate self
107 * ==> if "a" exists as a subtree, remove it.
108 */
109 const char *slash;
110 int namelen;
111 struct cache_tree_sub *down;
112
00703e6d
JH
113#if DEBUG
114 fprintf(stderr, "cache-tree invalidate <%s>\n", path);
115#endif
116
74986462 117 if (!it)
a5400efe 118 return 0;
2c5495f7
RM
119 slash = strchrnul(path, '/');
120 namelen = slash - path;
74986462 121 it->entry_count = -1;
2c5495f7 122 if (!*slash) {
61fa3097 123 int pos;
61fa3097
JH
124 pos = subtree_pos(it, path, namelen);
125 if (0 <= pos) {
126 cache_tree_free(&it->down[pos]->cache_tree);
127 free(it->down[pos]);
74986462
JH
128 /* 0 1 2 3 4 5
129 * ^ ^subtree_nr = 6
61fa3097 130 * pos
74986462 131 * move 4 and 5 up one place (2 entries)
61fa3097 132 * 2 = 6 - 3 - 1 = subtree_nr - pos - 1
74986462 133 */
f331ab9d
RS
134 MOVE_ARRAY(it->down + pos, it->down + pos + 1,
135 it->subtree_nr - pos - 1);
74986462
JH
136 it->subtree_nr--;
137 }
a5400efe 138 return 1;
74986462 139 }
74986462
JH
140 down = find_subtree(it, path, namelen, 0);
141 if (down)
a5400efe
NTND
142 do_invalidate_path(down->cache_tree, slash + 1);
143 return 1;
144}
145
146void cache_tree_invalidate_path(struct index_state *istate, const char *path)
147{
148 if (do_invalidate_path(istate->cache_tree, path))
149 istate->cache_changed |= CACHE_TREE_CHANGED;
74986462
JH
150}
151
d0cfc3e8 152static int verify_cache(struct cache_entry **cache,
e859c69b 153 int entries, int flags)
74986462
JH
154{
155 int i, funny;
e859c69b 156 int silent = flags & WRITE_TREE_SILENT;
74986462
JH
157
158 /* Verify that the tree is merged */
159 funny = 0;
160 for (i = 0; i < entries; i++) {
9c5e6c80 161 const struct cache_entry *ce = cache[i];
3f6d56de 162 if (ce_stage(ce)) {
996277c5
TR
163 if (silent)
164 return -1;
74986462
JH
165 if (10 < ++funny) {
166 fprintf(stderr, "...\n");
167 break;
168 }
dbc3904e 169 fprintf(stderr, "%s: unmerged (%s)\n",
99d1a986 170 ce->name, oid_to_hex(&ce->oid));
74986462
JH
171 }
172 }
173 if (funny)
174 return -1;
175
176 /* Also verify that the cache does not have path and path/file
177 * at the same time. At this point we know the cache has only
178 * stage 0 entries.
179 */
180 funny = 0;
181 for (i = 0; i < entries - 1; i++) {
182 /* path/file always comes after path because of the way
183 * the cache is sorted. Also path can appear only once,
184 * which means conflicting one would immediately follow.
185 */
186 const char *this_name = cache[i]->name;
187 const char *next_name = cache[i+1]->name;
188 int this_len = strlen(this_name);
189 if (this_len < strlen(next_name) &&
190 strncmp(this_name, next_name, this_len) == 0 &&
191 next_name[this_len] == '/') {
192 if (10 < ++funny) {
193 fprintf(stderr, "...\n");
194 break;
195 }
196 fprintf(stderr, "You have both %s and %s\n",
197 this_name, next_name);
198 }
199 }
200 if (funny)
201 return -1;
202 return 0;
203}
204
205static void discard_unused_subtrees(struct cache_tree *it)
206{
207 struct cache_tree_sub **down = it->down;
208 int nr = it->subtree_nr;
209 int dst, src;
210 for (dst = src = 0; src < nr; src++) {
211 struct cache_tree_sub *s = down[src];
212 if (s->used)
213 down[dst++] = s;
214 else {
bad68ec9 215 cache_tree_free(&s->cache_tree);
74986462
JH
216 free(s);
217 it->subtree_nr--;
218 }
219 }
220}
221
bad68ec9
JH
222int cache_tree_fully_valid(struct cache_tree *it)
223{
224 int i;
225 if (!it)
226 return 0;
e0a92804 227 if (it->entry_count < 0 || !has_sha1_file(it->oid.hash))
bad68ec9
JH
228 return 0;
229 for (i = 0; i < it->subtree_nr; i++) {
230 if (!cache_tree_fully_valid(it->down[i]->cache_tree))
231 return 0;
232 }
233 return 1;
234}
235
74986462 236static int update_one(struct cache_tree *it,
d0cfc3e8 237 struct cache_entry **cache,
74986462
JH
238 int entries,
239 const char *base,
240 int baselen,
3cf773e4 241 int *skip_count,
e859c69b 242 int flags)
74986462 243{
5242bcbb 244 struct strbuf buffer;
e859c69b
NTND
245 int missing_ok = flags & WRITE_TREE_MISSING_OK;
246 int dryrun = flags & WRITE_TREE_DRY_RUN;
aecf567c 247 int repair = flags & WRITE_TREE_REPAIR;
eec3e7e4 248 int to_invalidate = 0;
74986462
JH
249 int i;
250
aecf567c
DT
251 assert(!(dryrun && repair));
252
3cf773e4
NTND
253 *skip_count = 0;
254
e0a92804 255 if (0 <= it->entry_count && has_sha1_file(it->oid.hash))
74986462
JH
256 return it->entry_count;
257
258 /*
259 * We first scan for subtrees and update them; we start by
260 * marking existing subtrees -- the ones that are unmarked
261 * should not be in the result.
262 */
263 for (i = 0; i < it->subtree_nr; i++)
264 it->down[i]->used = 0;
265
266 /*
267 * Find the subtrees and update them.
268 */
386cc8b0
NTND
269 i = 0;
270 while (i < entries) {
9c5e6c80 271 const struct cache_entry *ce = cache[i];
74986462
JH
272 struct cache_tree_sub *sub;
273 const char *path, *slash;
3cf773e4 274 int pathlen, sublen, subcnt, subskip;
74986462
JH
275
276 path = ce->name;
277 pathlen = ce_namelen(ce);
278 if (pathlen <= baselen || memcmp(base, path, baselen))
279 break; /* at the end of this level */
280
281 slash = strchr(path + baselen, '/');
386cc8b0
NTND
282 if (!slash) {
283 i++;
74986462 284 continue;
386cc8b0 285 }
74986462
JH
286 /*
287 * a/bbb/c (base = a/, slash = /c)
288 * ==>
289 * path+baselen = bbb/c, sublen = 3
290 */
291 sublen = slash - (path + baselen);
292 sub = find_subtree(it, path + baselen, sublen, 1);
293 if (!sub->cache_tree)
294 sub->cache_tree = cache_tree();
295 subcnt = update_one(sub->cache_tree,
296 cache + i, entries - i,
297 path,
298 baselen + sublen + 1,
3cf773e4 299 &subskip,
e859c69b 300 flags);
3d12d0cf
JS
301 if (subcnt < 0)
302 return subcnt;
729dbbd9
JK
303 if (!subcnt)
304 die("index cache-tree records empty sub-tree");
386cc8b0 305 i += subcnt;
3cf773e4
NTND
306 sub->count = subcnt; /* to be used in the next loop */
307 *skip_count += subskip;
74986462
JH
308 sub->used = 1;
309 }
310
311 discard_unused_subtrees(it);
312
313 /*
314 * Then write out the tree object for this level.
315 */
f1696ee3 316 strbuf_init(&buffer, 8192);
74986462 317
386cc8b0
NTND
318 i = 0;
319 while (i < entries) {
9c5e6c80 320 const struct cache_entry *ce = cache[i];
c041d54a 321 struct cache_tree_sub *sub = NULL;
74986462
JH
322 const char *path, *slash;
323 int pathlen, entlen;
324 const unsigned char *sha1;
325 unsigned mode;
4ed115e9 326 int expected_missing = 0;
6d6a782f 327 int contains_ita = 0;
74986462
JH
328
329 path = ce->name;
330 pathlen = ce_namelen(ce);
331 if (pathlen <= baselen || memcmp(base, path, baselen))
332 break; /* at the end of this level */
333
334 slash = strchr(path + baselen, '/');
335 if (slash) {
336 entlen = slash - (path + baselen);
337 sub = find_subtree(it, path + baselen, entlen, 0);
338 if (!sub)
339 die("cache-tree.c: '%.*s' in '%s' not found",
340 entlen, path + baselen, path);
3cf773e4 341 i += sub->count;
e0a92804 342 sha1 = sub->cache_tree->oid.hash;
74986462 343 mode = S_IFDIR;
6d6a782f
NTND
344 contains_ita = sub->cache_tree->entry_count < 0;
345 if (contains_ita) {
eec3e7e4 346 to_invalidate = 1;
4ed115e9
JH
347 expected_missing = 1;
348 }
74986462
JH
349 }
350 else {
99d1a986 351 sha1 = ce->oid.hash;
7a51ed66 352 mode = ce->ce_mode;
74986462 353 entlen = pathlen - baselen;
386cc8b0 354 i++;
74986462 355 }
a96d3cc3
JK
356
357 if (is_null_sha1(sha1) ||
358 (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1))) {
b6b56ace 359 strbuf_release(&buffer);
4ed115e9
JH
360 if (expected_missing)
361 return -1;
a3883734
LT
362 return error("invalid object %06o %s for '%.*s'",
363 mode, sha1_to_hex(sha1), entlen+baselen, path);
b6b56ace 364 }
74986462 365
3cf773e4
NTND
366 /*
367 * CE_REMOVE entries are removed before the index is
368 * written to disk. Skip them to remain consistent
369 * with the future on-disk index.
370 */
371 if (ce->ce_flags & CE_REMOVE) {
372 *skip_count = *skip_count + 1;
373 continue;
374 }
375
eec3e7e4
NTND
376 /*
377 * CE_INTENT_TO_ADD entries exist on on-disk index but
378 * they are not part of generated trees. Invalidate up
379 * to root to force cache-tree users to read elsewhere.
380 */
c041d54a 381 if (!sub && ce_intent_to_add(ce)) {
eec3e7e4 382 to_invalidate = 1;
3cf773e4 383 continue;
eec3e7e4 384 }
74986462 385
6d6a782f
NTND
386 /*
387 * "sub" can be an empty tree if all subentries are i-t-a.
388 */
389 if (contains_ita && !hashcmp(sha1, EMPTY_TREE_SHA1_BIN))
390 continue;
391
5242bcbb
PH
392 strbuf_grow(&buffer, entlen + 100);
393 strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0');
394 strbuf_add(&buffer, sha1, 20);
74986462
JH
395
396#if DEBUG
00703e6d 397 fprintf(stderr, "cache-tree update-one %o %.*s\n",
74986462
JH
398 mode, entlen, path + baselen);
399#endif
400 }
401
aecf567c
DT
402 if (repair) {
403 unsigned char sha1[20];
404 hash_sha1_file(buffer.buf, buffer.len, tree_type, sha1);
405 if (has_sha1_file(sha1))
e0a92804 406 hashcpy(it->oid.hash, sha1);
aecf567c
DT
407 else
408 to_invalidate = 1;
409 } else if (dryrun)
e0a92804 410 hash_sha1_file(buffer.buf, buffer.len, tree_type,
411 it->oid.hash);
412 else if (write_sha1_file(buffer.buf, buffer.len, tree_type, it->oid.hash)) {
edae5f0c
JH
413 strbuf_release(&buffer);
414 return -1;
415 }
416
5242bcbb 417 strbuf_release(&buffer);
eec3e7e4 418 it->entry_count = to_invalidate ? -1 : i - *skip_count;
74986462 419#if DEBUG
00703e6d 420 fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n",
74986462 421 it->entry_count, it->subtree_nr,
e0a92804 422 oid_to_hex(&it->oid));
74986462
JH
423#endif
424 return i;
425}
426
d0cfc3e8 427int cache_tree_update(struct index_state *istate, int flags)
74986462 428{
d0cfc3e8
NTND
429 struct cache_tree *it = istate->cache_tree;
430 struct cache_entry **cache = istate->cache;
431 int entries = istate->cache_nr;
432 int skip, i = verify_cache(cache, entries, flags);
433
74986462
JH
434 if (i)
435 return i;
3cf773e4 436 i = update_one(it, cache, entries, "", 0, &skip, flags);
74986462
JH
437 if (i < 0)
438 return i;
d0cfc3e8 439 istate->cache_changed |= CACHE_TREE_CHANGED;
74986462
JH
440 return 0;
441}
442
1dffb8fa
PH
443static void write_one(struct strbuf *buffer, struct cache_tree *it,
444 const char *path, int pathlen)
74986462
JH
445{
446 int i;
447
448 /* One "cache-tree" entry consists of the following:
449 * path (NUL terminated)
450 * entry_count, subtree_nr ("%d %d\n")
451 * tree-sha1 (missing if invalid)
452 * subtree_nr "cache-tree" entries for subtrees.
453 */
5242bcbb
PH
454 strbuf_grow(buffer, pathlen + 100);
455 strbuf_add(buffer, path, pathlen);
456 strbuf_addf(buffer, "%c%d %d\n", 0, it->entry_count, it->subtree_nr);
74986462
JH
457
458#if DEBUG
459 if (0 <= it->entry_count)
460 fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n",
461 pathlen, path, it->entry_count, it->subtree_nr,
e0a92804 462 oid_to_hex(&it->oid));
74986462
JH
463 else
464 fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n",
465 pathlen, path, it->subtree_nr);
466#endif
467
468 if (0 <= it->entry_count) {
e0a92804 469 strbuf_add(buffer, it->oid.hash, 20);
74986462
JH
470 }
471 for (i = 0; i < it->subtree_nr; i++) {
472 struct cache_tree_sub *down = it->down[i];
61fa3097
JH
473 if (i) {
474 struct cache_tree_sub *prev = it->down[i-1];
475 if (subtree_name_cmp(down->name, down->namelen,
476 prev->name, prev->namelen) <= 0)
477 die("fatal - unsorted cache subtree");
478 }
1dffb8fa 479 write_one(buffer, down->cache_tree, down->name, down->namelen);
74986462 480 }
74986462
JH
481}
482
1dffb8fa 483void cache_tree_write(struct strbuf *sb, struct cache_tree *root)
74986462 484{
1dffb8fa 485 write_one(sb, root, "", 0);
74986462
JH
486}
487
488static struct cache_tree *read_one(const char **buffer, unsigned long *size_p)
489{
490 const char *buf = *buffer;
491 unsigned long size = *size_p;
0111ea38
JS
492 const char *cp;
493 char *ep;
74986462
JH
494 struct cache_tree *it;
495 int i, subtree_nr;
496
497 it = NULL;
498 /* skip name, but make sure name exists */
499 while (size && *buf) {
500 size--;
501 buf++;
502 }
503 if (!size)
504 goto free_return;
505 buf++; size--;
506 it = cache_tree();
0111ea38
JS
507
508 cp = buf;
509 it->entry_count = strtol(cp, &ep, 10);
510 if (cp == ep)
511 goto free_return;
512 cp = ep;
513 subtree_nr = strtol(cp, &ep, 10);
514 if (cp == ep)
74986462
JH
515 goto free_return;
516 while (size && *buf && *buf != '\n') {
517 size--;
518 buf++;
519 }
520 if (!size)
521 goto free_return;
522 buf++; size--;
523 if (0 <= it->entry_count) {
524 if (size < 20)
525 goto free_return;
e0a92804 526 hashcpy(it->oid.hash, (const unsigned char*)buf);
74986462
JH
527 buf += 20;
528 size -= 20;
529 }
530
531#if DEBUG
532 if (0 <= it->entry_count)
533 fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n",
534 *buffer, it->entry_count, subtree_nr,
e0a92804 535 oid_to_hex(&it->oid));
74986462
JH
536 else
537 fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n",
538 *buffer, subtree_nr);
539#endif
540
541 /*
542 * Just a heuristic -- we do not add directories that often but
543 * we do not want to have to extend it immediately when we do,
544 * hence +2.
545 */
546 it->subtree_alloc = subtree_nr + 2;
547 it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *));
548 for (i = 0; i < subtree_nr; i++) {
549 /* read each subtree */
550 struct cache_tree *sub;
61fa3097 551 struct cache_tree_sub *subtree;
74986462 552 const char *name = buf;
7927a55d 553
74986462
JH
554 sub = read_one(&buf, &size);
555 if (!sub)
556 goto free_return;
7927a55d 557 subtree = cache_tree_sub(it, name);
61fa3097 558 subtree->cache_tree = sub;
74986462
JH
559 }
560 if (subtree_nr != it->subtree_nr)
561 die("cache-tree: internal error");
562 *buffer = buf;
563 *size_p = size;
564 return it;
565
566 free_return:
bad68ec9 567 cache_tree_free(&it);
74986462
JH
568 return NULL;
569}
570
bad68ec9 571struct cache_tree *cache_tree_read(const char *buffer, unsigned long size)
74986462 572{
bad68ec9 573 if (buffer[0])
74986462 574 return NULL; /* not the whole tree */
74986462
JH
575 return read_one(&buffer, &size);
576}
6bd20358 577
7ba04d9f 578static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path)
6bd20358 579{
b87fc964
JH
580 if (!it)
581 return NULL;
6bd20358
JH
582 while (*path) {
583 const char *slash;
584 struct cache_tree_sub *sub;
585
17e22ddc 586 slash = strchrnul(path, '/');
79192b87
MH
587 /*
588 * Between path and slash is the name of the subtree
589 * to look for.
6bd20358
JH
590 */
591 sub = find_subtree(it, path, slash - path, 0);
592 if (!sub)
593 return NULL;
594 it = sub->cache_tree;
3491047e 595
6bd20358 596 path = slash;
3491047e
MH
597 while (*path == '/')
598 path++;
6bd20358
JH
599 }
600 return it;
601}
45525bd0 602
d23a5117 603int write_index_as_tree(unsigned char *sha1, struct index_state *index_state, const char *index_path, int flags, const char *prefix)
45525bd0
JH
604{
605 int entries, was_valid, newfd;
bfffb48c 606 struct lock_file lock_file = LOCK_INIT;
c82c75b9 607 int ret = 0;
45525bd0 608
bfffb48c 609 newfd = hold_lock_file_for_update(&lock_file, index_path, LOCK_DIE_ON_ERROR);
45525bd0 610
d23a5117 611 entries = read_index_from(index_state, index_path);
c82c75b9
JK
612 if (entries < 0) {
613 ret = WRITE_TREE_UNREADABLE_INDEX;
614 goto out;
615 }
d11b8d34 616 if (flags & WRITE_TREE_IGNORE_CACHE_TREE)
d23a5117 617 cache_tree_free(&index_state->cache_tree);
45525bd0 618
d23a5117
PT
619 if (!index_state->cache_tree)
620 index_state->cache_tree = cache_tree();
45525bd0 621
d23a5117 622 was_valid = cache_tree_fully_valid(index_state->cache_tree);
45525bd0 623 if (!was_valid) {
c82c75b9
JK
624 if (cache_tree_update(index_state, flags) < 0) {
625 ret = WRITE_TREE_UNMERGED_INDEX;
626 goto out;
627 }
45525bd0 628 if (0 <= newfd) {
bfffb48c 629 if (!write_locked_index(index_state, &lock_file, COMMIT_LOCK))
45525bd0
JH
630 newfd = -1;
631 }
632 /* Not being able to write is fine -- we are only interested
633 * in updating the cache-tree part, and if the next caller
634 * ends up using the old index with unupdated cache-tree part
635 * it misses the work we did here, but that is just a
636 * performance penalty and not a big deal.
637 */
638 }
639
640 if (prefix) {
d23a5117
PT
641 struct cache_tree *subtree;
642 subtree = cache_tree_find(index_state->cache_tree, prefix);
c82c75b9
JK
643 if (!subtree) {
644 ret = WRITE_TREE_PREFIX_ERROR;
645 goto out;
646 }
e0a92804 647 hashcpy(sha1, subtree->oid.hash);
45525bd0
JH
648 }
649 else
e0a92804 650 hashcpy(sha1, index_state->cache_tree->oid.hash);
45525bd0 651
c82c75b9 652out:
45525bd0 653 if (0 <= newfd)
bfffb48c 654 rollback_lock_file(&lock_file);
c82c75b9 655 return ret;
45525bd0 656}
b9d37a54 657
d23a5117
PT
658int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix)
659{
660 return write_index_as_tree(sha1, &the_index, get_index_file(), flags, prefix);
661}
662
b9d37a54
JH
663static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree)
664{
665 struct tree_desc desc;
666 struct name_entry entry;
667 int cnt;
668
e0a92804 669 oidcpy(&it->oid, &tree->object.oid);
b9d37a54
JH
670 init_tree_desc(&desc, tree->buffer, tree->size);
671 cnt = 0;
672 while (tree_entry(&desc, &entry)) {
673 if (!S_ISDIR(entry.mode))
674 cnt++;
675 else {
676 struct cache_tree_sub *sub;
740ee055 677 struct tree *subtree = lookup_tree(entry.oid);
b9d37a54
JH
678 if (!subtree->object.parsed)
679 parse_tree(subtree);
680 sub = cache_tree_sub(it, entry.path);
681 sub->cache_tree = cache_tree();
682 prime_cache_tree_rec(sub->cache_tree, subtree);
683 cnt += sub->cache_tree->entry_count;
684 }
685 }
686 it->entry_count = cnt;
687}
688
e6c286e8 689void prime_cache_tree(struct index_state *istate, struct tree *tree)
b9d37a54 690{
e6c286e8
NTND
691 cache_tree_free(&istate->cache_tree);
692 istate->cache_tree = cache_tree();
693 prime_cache_tree_rec(istate->cache_tree, tree);
694 istate->cache_changed |= CACHE_TREE_CHANGED;
b9d37a54 695}
b65982b6
JH
696
697/*
698 * find the cache_tree that corresponds to the current level without
699 * exploding the full path into textual form. The root of the
700 * cache tree is given as "root", and our current level is "info".
701 * (1) When at root level, info->prev is NULL, so it is "root" itself.
702 * (2) Otherwise, find the cache_tree that corresponds to one level
703 * above us, and find ourselves in there.
704 */
705static struct cache_tree *find_cache_tree_from_traversal(struct cache_tree *root,
706 struct traverse_info *info)
707{
708 struct cache_tree *our_parent;
709
710 if (!info->prev)
711 return root;
712 our_parent = find_cache_tree_from_traversal(root, info->prev);
713 return cache_tree_find(our_parent, info->name.path);
714}
715
716int cache_tree_matches_traversal(struct cache_tree *root,
717 struct name_entry *ent,
718 struct traverse_info *info)
719{
720 struct cache_tree *it;
721
722 it = find_cache_tree_from_traversal(root, info);
723 it = cache_tree_find(it, ent->path);
e0a92804 724 if (it && it->entry_count > 0 && !oidcmp(ent->oid, &it->oid))
b65982b6
JH
725 return it->entry_count;
726 return 0;
727}
996277c5 728
e859c69b 729int update_main_cache_tree(int flags)
996277c5
TR
730{
731 if (!the_index.cache_tree)
732 the_index.cache_tree = cache_tree();
d0cfc3e8 733 return cache_tree_update(&the_index, flags);
996277c5 734}