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Commit | Line | Data |
---|---|---|
74986462 JH |
1 | #include "cache.h" |
2 | #include "tree.h" | |
b9d37a54 | 3 | #include "tree-walk.h" |
74986462 JH |
4 | #include "cache-tree.h" |
5 | ||
4903161f | 6 | #ifndef DEBUG |
74986462 | 7 | #define DEBUG 0 |
4903161f | 8 | #endif |
74986462 JH |
9 | |
10 | struct cache_tree *cache_tree(void) | |
11 | { | |
12 | struct cache_tree *it = xcalloc(1, sizeof(struct cache_tree)); | |
13 | it->entry_count = -1; | |
14 | return it; | |
15 | } | |
16 | ||
bad68ec9 | 17 | void cache_tree_free(struct cache_tree **it_p) |
74986462 JH |
18 | { |
19 | int i; | |
bad68ec9 | 20 | struct cache_tree *it = *it_p; |
74986462 JH |
21 | |
22 | if (!it) | |
23 | return; | |
24 | for (i = 0; i < it->subtree_nr; i++) | |
61fa3097 JH |
25 | if (it->down[i]) |
26 | cache_tree_free(&it->down[i]->cache_tree); | |
74986462 JH |
27 | free(it->down); |
28 | free(it); | |
bad68ec9 | 29 | *it_p = NULL; |
74986462 JH |
30 | } |
31 | ||
61fa3097 JH |
32 | static int subtree_name_cmp(const char *one, int onelen, |
33 | const char *two, int twolen) | |
34 | { | |
35 | if (onelen < twolen) | |
36 | return -1; | |
37 | if (twolen < onelen) | |
38 | return 1; | |
39 | return memcmp(one, two, onelen); | |
40 | } | |
41 | ||
42 | static int subtree_pos(struct cache_tree *it, const char *path, int pathlen) | |
43 | { | |
44 | struct cache_tree_sub **down = it->down; | |
45 | int lo, hi; | |
46 | lo = 0; | |
47 | hi = it->subtree_nr; | |
48 | while (lo < hi) { | |
49 | int mi = (lo + hi) / 2; | |
50 | struct cache_tree_sub *mdl = down[mi]; | |
51 | int cmp = subtree_name_cmp(path, pathlen, | |
52 | mdl->name, mdl->namelen); | |
53 | if (!cmp) | |
54 | return mi; | |
55 | if (cmp < 0) | |
56 | hi = mi; | |
57 | else | |
58 | lo = mi + 1; | |
59 | } | |
60 | return -lo-1; | |
61 | } | |
62 | ||
74986462 JH |
63 | static struct cache_tree_sub *find_subtree(struct cache_tree *it, |
64 | const char *path, | |
65 | int pathlen, | |
66 | int create) | |
67 | { | |
74986462 | 68 | struct cache_tree_sub *down; |
61fa3097 JH |
69 | int pos = subtree_pos(it, path, pathlen); |
70 | if (0 <= pos) | |
71 | return it->down[pos]; | |
74986462 JH |
72 | if (!create) |
73 | return NULL; | |
61fa3097 JH |
74 | |
75 | pos = -pos-1; | |
74986462 JH |
76 | if (it->subtree_alloc <= it->subtree_nr) { |
77 | it->subtree_alloc = alloc_nr(it->subtree_alloc); | |
78 | it->down = xrealloc(it->down, it->subtree_alloc * | |
79 | sizeof(*it->down)); | |
80 | } | |
61fa3097 JH |
81 | it->subtree_nr++; |
82 | ||
74986462 | 83 | down = xmalloc(sizeof(*down) + pathlen + 1); |
61fa3097 | 84 | down->cache_tree = NULL; |
74986462 JH |
85 | down->namelen = pathlen; |
86 | memcpy(down->name, path, pathlen); | |
61fa3097 JH |
87 | down->name[pathlen] = 0; |
88 | ||
89 | if (pos < it->subtree_nr) | |
90 | memmove(it->down + pos + 1, | |
91 | it->down + pos, | |
92 | sizeof(down) * (it->subtree_nr - pos - 1)); | |
93 | it->down[pos] = down; | |
74986462 JH |
94 | return down; |
95 | } | |
96 | ||
7927a55d JH |
97 | struct cache_tree_sub *cache_tree_sub(struct cache_tree *it, const char *path) |
98 | { | |
99 | int pathlen = strlen(path); | |
100 | return find_subtree(it, path, pathlen, 1); | |
101 | } | |
102 | ||
74986462 JH |
103 | void cache_tree_invalidate_path(struct cache_tree *it, const char *path) |
104 | { | |
105 | /* a/b/c | |
106 | * ==> invalidate self | |
107 | * ==> find "a", have it invalidate "b/c" | |
108 | * a | |
109 | * ==> invalidate self | |
110 | * ==> if "a" exists as a subtree, remove it. | |
111 | */ | |
112 | const char *slash; | |
113 | int namelen; | |
114 | struct cache_tree_sub *down; | |
115 | ||
00703e6d JH |
116 | #if DEBUG |
117 | fprintf(stderr, "cache-tree invalidate <%s>\n", path); | |
118 | #endif | |
119 | ||
74986462 JH |
120 | if (!it) |
121 | return; | |
122 | slash = strchr(path, '/'); | |
123 | it->entry_count = -1; | |
124 | if (!slash) { | |
61fa3097 | 125 | int pos; |
74986462 | 126 | namelen = strlen(path); |
61fa3097 JH |
127 | pos = subtree_pos(it, path, namelen); |
128 | if (0 <= pos) { | |
129 | cache_tree_free(&it->down[pos]->cache_tree); | |
130 | free(it->down[pos]); | |
74986462 JH |
131 | /* 0 1 2 3 4 5 |
132 | * ^ ^subtree_nr = 6 | |
61fa3097 | 133 | * pos |
74986462 | 134 | * move 4 and 5 up one place (2 entries) |
61fa3097 | 135 | * 2 = 6 - 3 - 1 = subtree_nr - pos - 1 |
74986462 | 136 | */ |
61fa3097 | 137 | memmove(it->down+pos, it->down+pos+1, |
74986462 | 138 | sizeof(struct cache_tree_sub *) * |
61fa3097 | 139 | (it->subtree_nr - pos - 1)); |
74986462 JH |
140 | it->subtree_nr--; |
141 | } | |
142 | return; | |
143 | } | |
144 | namelen = slash - path; | |
145 | down = find_subtree(it, path, namelen, 0); | |
146 | if (down) | |
147 | cache_tree_invalidate_path(down->cache_tree, slash + 1); | |
148 | } | |
149 | ||
150 | static int verify_cache(struct cache_entry **cache, | |
151 | int entries) | |
152 | { | |
153 | int i, funny; | |
154 | ||
155 | /* Verify that the tree is merged */ | |
156 | funny = 0; | |
157 | for (i = 0; i < entries; i++) { | |
158 | struct cache_entry *ce = cache[i]; | |
331fcb59 | 159 | if (ce_stage(ce) || (ce->ce_flags & CE_INTENT_TO_ADD)) { |
74986462 JH |
160 | if (10 < ++funny) { |
161 | fprintf(stderr, "...\n"); | |
162 | break; | |
163 | } | |
331fcb59 JH |
164 | if (ce_stage(ce)) |
165 | fprintf(stderr, "%s: unmerged (%s)\n", | |
166 | ce->name, sha1_to_hex(ce->sha1)); | |
167 | else | |
168 | fprintf(stderr, "%s: not added yet\n", | |
169 | ce->name); | |
74986462 JH |
170 | } |
171 | } | |
172 | if (funny) | |
173 | return -1; | |
174 | ||
175 | /* Also verify that the cache does not have path and path/file | |
176 | * at the same time. At this point we know the cache has only | |
177 | * stage 0 entries. | |
178 | */ | |
179 | funny = 0; | |
180 | for (i = 0; i < entries - 1; i++) { | |
181 | /* path/file always comes after path because of the way | |
182 | * the cache is sorted. Also path can appear only once, | |
183 | * which means conflicting one would immediately follow. | |
184 | */ | |
185 | const char *this_name = cache[i]->name; | |
186 | const char *next_name = cache[i+1]->name; | |
187 | int this_len = strlen(this_name); | |
188 | if (this_len < strlen(next_name) && | |
189 | strncmp(this_name, next_name, this_len) == 0 && | |
190 | next_name[this_len] == '/') { | |
191 | if (10 < ++funny) { | |
192 | fprintf(stderr, "...\n"); | |
193 | break; | |
194 | } | |
195 | fprintf(stderr, "You have both %s and %s\n", | |
196 | this_name, next_name); | |
197 | } | |
198 | } | |
199 | if (funny) | |
200 | return -1; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static void discard_unused_subtrees(struct cache_tree *it) | |
205 | { | |
206 | struct cache_tree_sub **down = it->down; | |
207 | int nr = it->subtree_nr; | |
208 | int dst, src; | |
209 | for (dst = src = 0; src < nr; src++) { | |
210 | struct cache_tree_sub *s = down[src]; | |
211 | if (s->used) | |
212 | down[dst++] = s; | |
213 | else { | |
bad68ec9 | 214 | cache_tree_free(&s->cache_tree); |
74986462 JH |
215 | free(s); |
216 | it->subtree_nr--; | |
217 | } | |
218 | } | |
219 | } | |
220 | ||
bad68ec9 JH |
221 | int cache_tree_fully_valid(struct cache_tree *it) |
222 | { | |
223 | int i; | |
224 | if (!it) | |
225 | return 0; | |
226 | if (it->entry_count < 0 || !has_sha1_file(it->sha1)) | |
227 | return 0; | |
228 | for (i = 0; i < it->subtree_nr; i++) { | |
229 | if (!cache_tree_fully_valid(it->down[i]->cache_tree)) | |
230 | return 0; | |
231 | } | |
232 | return 1; | |
233 | } | |
234 | ||
74986462 JH |
235 | static int update_one(struct cache_tree *it, |
236 | struct cache_entry **cache, | |
237 | int entries, | |
238 | const char *base, | |
239 | int baselen, | |
2956dd3b JH |
240 | int missing_ok, |
241 | int dryrun) | |
74986462 | 242 | { |
5242bcbb | 243 | struct strbuf buffer; |
74986462 JH |
244 | int i; |
245 | ||
dd0c34c4 | 246 | if (0 <= it->entry_count && has_sha1_file(it->sha1)) |
74986462 JH |
247 | return it->entry_count; |
248 | ||
249 | /* | |
250 | * We first scan for subtrees and update them; we start by | |
251 | * marking existing subtrees -- the ones that are unmarked | |
252 | * should not be in the result. | |
253 | */ | |
254 | for (i = 0; i < it->subtree_nr; i++) | |
255 | it->down[i]->used = 0; | |
256 | ||
257 | /* | |
258 | * Find the subtrees and update them. | |
259 | */ | |
260 | for (i = 0; i < entries; i++) { | |
261 | struct cache_entry *ce = cache[i]; | |
262 | struct cache_tree_sub *sub; | |
263 | const char *path, *slash; | |
264 | int pathlen, sublen, subcnt; | |
265 | ||
266 | path = ce->name; | |
267 | pathlen = ce_namelen(ce); | |
268 | if (pathlen <= baselen || memcmp(base, path, baselen)) | |
269 | break; /* at the end of this level */ | |
270 | ||
271 | slash = strchr(path + baselen, '/'); | |
272 | if (!slash) | |
273 | continue; | |
274 | /* | |
275 | * a/bbb/c (base = a/, slash = /c) | |
276 | * ==> | |
277 | * path+baselen = bbb/c, sublen = 3 | |
278 | */ | |
279 | sublen = slash - (path + baselen); | |
280 | sub = find_subtree(it, path + baselen, sublen, 1); | |
281 | if (!sub->cache_tree) | |
282 | sub->cache_tree = cache_tree(); | |
283 | subcnt = update_one(sub->cache_tree, | |
284 | cache + i, entries - i, | |
285 | path, | |
286 | baselen + sublen + 1, | |
2956dd3b JH |
287 | missing_ok, |
288 | dryrun); | |
3d12d0cf JS |
289 | if (subcnt < 0) |
290 | return subcnt; | |
74986462 JH |
291 | i += subcnt - 1; |
292 | sub->used = 1; | |
293 | } | |
294 | ||
295 | discard_unused_subtrees(it); | |
296 | ||
297 | /* | |
298 | * Then write out the tree object for this level. | |
299 | */ | |
f1696ee3 | 300 | strbuf_init(&buffer, 8192); |
74986462 JH |
301 | |
302 | for (i = 0; i < entries; i++) { | |
303 | struct cache_entry *ce = cache[i]; | |
304 | struct cache_tree_sub *sub; | |
305 | const char *path, *slash; | |
306 | int pathlen, entlen; | |
307 | const unsigned char *sha1; | |
308 | unsigned mode; | |
309 | ||
310 | path = ce->name; | |
311 | pathlen = ce_namelen(ce); | |
312 | if (pathlen <= baselen || memcmp(base, path, baselen)) | |
313 | break; /* at the end of this level */ | |
314 | ||
315 | slash = strchr(path + baselen, '/'); | |
316 | if (slash) { | |
317 | entlen = slash - (path + baselen); | |
318 | sub = find_subtree(it, path + baselen, entlen, 0); | |
319 | if (!sub) | |
320 | die("cache-tree.c: '%.*s' in '%s' not found", | |
321 | entlen, path + baselen, path); | |
322 | i += sub->cache_tree->entry_count - 1; | |
323 | sha1 = sub->cache_tree->sha1; | |
324 | mode = S_IFDIR; | |
325 | } | |
326 | else { | |
327 | sha1 = ce->sha1; | |
7a51ed66 | 328 | mode = ce->ce_mode; |
74986462 JH |
329 | entlen = pathlen - baselen; |
330 | } | |
302b9282 | 331 | if (mode != S_IFGITLINK && !missing_ok && !has_sha1_file(sha1)) |
a3883734 LT |
332 | return error("invalid object %06o %s for '%.*s'", |
333 | mode, sha1_to_hex(sha1), entlen+baselen, path); | |
74986462 | 334 | |
7a51ed66 | 335 | if (ce->ce_flags & CE_REMOVE) |
74986462 JH |
336 | continue; /* entry being removed */ |
337 | ||
5242bcbb PH |
338 | strbuf_grow(&buffer, entlen + 100); |
339 | strbuf_addf(&buffer, "%o %.*s%c", mode, entlen, path + baselen, '\0'); | |
340 | strbuf_add(&buffer, sha1, 20); | |
74986462 JH |
341 | |
342 | #if DEBUG | |
00703e6d | 343 | fprintf(stderr, "cache-tree update-one %o %.*s\n", |
74986462 JH |
344 | mode, entlen, path + baselen); |
345 | #endif | |
346 | } | |
347 | ||
abdc3fc8 | 348 | if (dryrun) |
5242bcbb | 349 | hash_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1); |
edae5f0c JH |
350 | else if (write_sha1_file(buffer.buf, buffer.len, tree_type, it->sha1)) { |
351 | strbuf_release(&buffer); | |
352 | return -1; | |
353 | } | |
354 | ||
5242bcbb | 355 | strbuf_release(&buffer); |
74986462 JH |
356 | it->entry_count = i; |
357 | #if DEBUG | |
00703e6d | 358 | fprintf(stderr, "cache-tree update-one (%d ent, %d subtree) %s\n", |
74986462 JH |
359 | it->entry_count, it->subtree_nr, |
360 | sha1_to_hex(it->sha1)); | |
361 | #endif | |
362 | return i; | |
363 | } | |
364 | ||
365 | int cache_tree_update(struct cache_tree *it, | |
366 | struct cache_entry **cache, | |
367 | int entries, | |
2956dd3b JH |
368 | int missing_ok, |
369 | int dryrun) | |
74986462 JH |
370 | { |
371 | int i; | |
372 | i = verify_cache(cache, entries); | |
373 | if (i) | |
374 | return i; | |
2956dd3b | 375 | i = update_one(it, cache, entries, "", 0, missing_ok, dryrun); |
74986462 JH |
376 | if (i < 0) |
377 | return i; | |
378 | return 0; | |
379 | } | |
380 | ||
1dffb8fa PH |
381 | static void write_one(struct strbuf *buffer, struct cache_tree *it, |
382 | const char *path, int pathlen) | |
74986462 JH |
383 | { |
384 | int i; | |
385 | ||
386 | /* One "cache-tree" entry consists of the following: | |
387 | * path (NUL terminated) | |
388 | * entry_count, subtree_nr ("%d %d\n") | |
389 | * tree-sha1 (missing if invalid) | |
390 | * subtree_nr "cache-tree" entries for subtrees. | |
391 | */ | |
5242bcbb PH |
392 | strbuf_grow(buffer, pathlen + 100); |
393 | strbuf_add(buffer, path, pathlen); | |
394 | strbuf_addf(buffer, "%c%d %d\n", 0, it->entry_count, it->subtree_nr); | |
74986462 JH |
395 | |
396 | #if DEBUG | |
397 | if (0 <= it->entry_count) | |
398 | fprintf(stderr, "cache-tree <%.*s> (%d ent, %d subtree) %s\n", | |
399 | pathlen, path, it->entry_count, it->subtree_nr, | |
400 | sha1_to_hex(it->sha1)); | |
401 | else | |
402 | fprintf(stderr, "cache-tree <%.*s> (%d subtree) invalid\n", | |
403 | pathlen, path, it->subtree_nr); | |
404 | #endif | |
405 | ||
406 | if (0 <= it->entry_count) { | |
5242bcbb | 407 | strbuf_add(buffer, it->sha1, 20); |
74986462 JH |
408 | } |
409 | for (i = 0; i < it->subtree_nr; i++) { | |
410 | struct cache_tree_sub *down = it->down[i]; | |
61fa3097 JH |
411 | if (i) { |
412 | struct cache_tree_sub *prev = it->down[i-1]; | |
413 | if (subtree_name_cmp(down->name, down->namelen, | |
414 | prev->name, prev->namelen) <= 0) | |
415 | die("fatal - unsorted cache subtree"); | |
416 | } | |
1dffb8fa | 417 | write_one(buffer, down->cache_tree, down->name, down->namelen); |
74986462 | 418 | } |
74986462 JH |
419 | } |
420 | ||
1dffb8fa | 421 | void cache_tree_write(struct strbuf *sb, struct cache_tree *root) |
74986462 | 422 | { |
1dffb8fa | 423 | write_one(sb, root, "", 0); |
74986462 JH |
424 | } |
425 | ||
426 | static struct cache_tree *read_one(const char **buffer, unsigned long *size_p) | |
427 | { | |
428 | const char *buf = *buffer; | |
429 | unsigned long size = *size_p; | |
0111ea38 JS |
430 | const char *cp; |
431 | char *ep; | |
74986462 JH |
432 | struct cache_tree *it; |
433 | int i, subtree_nr; | |
434 | ||
435 | it = NULL; | |
436 | /* skip name, but make sure name exists */ | |
437 | while (size && *buf) { | |
438 | size--; | |
439 | buf++; | |
440 | } | |
441 | if (!size) | |
442 | goto free_return; | |
443 | buf++; size--; | |
444 | it = cache_tree(); | |
0111ea38 JS |
445 | |
446 | cp = buf; | |
447 | it->entry_count = strtol(cp, &ep, 10); | |
448 | if (cp == ep) | |
449 | goto free_return; | |
450 | cp = ep; | |
451 | subtree_nr = strtol(cp, &ep, 10); | |
452 | if (cp == ep) | |
74986462 JH |
453 | goto free_return; |
454 | while (size && *buf && *buf != '\n') { | |
455 | size--; | |
456 | buf++; | |
457 | } | |
458 | if (!size) | |
459 | goto free_return; | |
460 | buf++; size--; | |
461 | if (0 <= it->entry_count) { | |
462 | if (size < 20) | |
463 | goto free_return; | |
63daae47 | 464 | hashcpy(it->sha1, (const unsigned char*)buf); |
74986462 JH |
465 | buf += 20; |
466 | size -= 20; | |
467 | } | |
468 | ||
469 | #if DEBUG | |
470 | if (0 <= it->entry_count) | |
471 | fprintf(stderr, "cache-tree <%s> (%d ent, %d subtree) %s\n", | |
472 | *buffer, it->entry_count, subtree_nr, | |
473 | sha1_to_hex(it->sha1)); | |
474 | else | |
475 | fprintf(stderr, "cache-tree <%s> (%d subtrees) invalid\n", | |
476 | *buffer, subtree_nr); | |
477 | #endif | |
478 | ||
479 | /* | |
480 | * Just a heuristic -- we do not add directories that often but | |
481 | * we do not want to have to extend it immediately when we do, | |
482 | * hence +2. | |
483 | */ | |
484 | it->subtree_alloc = subtree_nr + 2; | |
485 | it->down = xcalloc(it->subtree_alloc, sizeof(struct cache_tree_sub *)); | |
486 | for (i = 0; i < subtree_nr; i++) { | |
487 | /* read each subtree */ | |
488 | struct cache_tree *sub; | |
61fa3097 | 489 | struct cache_tree_sub *subtree; |
74986462 | 490 | const char *name = buf; |
7927a55d | 491 | |
74986462 JH |
492 | sub = read_one(&buf, &size); |
493 | if (!sub) | |
494 | goto free_return; | |
7927a55d | 495 | subtree = cache_tree_sub(it, name); |
61fa3097 | 496 | subtree->cache_tree = sub; |
74986462 JH |
497 | } |
498 | if (subtree_nr != it->subtree_nr) | |
499 | die("cache-tree: internal error"); | |
500 | *buffer = buf; | |
501 | *size_p = size; | |
502 | return it; | |
503 | ||
504 | free_return: | |
bad68ec9 | 505 | cache_tree_free(&it); |
74986462 JH |
506 | return NULL; |
507 | } | |
508 | ||
bad68ec9 | 509 | struct cache_tree *cache_tree_read(const char *buffer, unsigned long size) |
74986462 | 510 | { |
bad68ec9 | 511 | if (buffer[0]) |
74986462 | 512 | return NULL; /* not the whole tree */ |
74986462 JH |
513 | return read_one(&buffer, &size); |
514 | } | |
6bd20358 | 515 | |
7ba04d9f | 516 | static struct cache_tree *cache_tree_find(struct cache_tree *it, const char *path) |
6bd20358 | 517 | { |
b87fc964 JH |
518 | if (!it) |
519 | return NULL; | |
6bd20358 JH |
520 | while (*path) { |
521 | const char *slash; | |
522 | struct cache_tree_sub *sub; | |
523 | ||
524 | slash = strchr(path, '/'); | |
525 | if (!slash) | |
526 | slash = path + strlen(path); | |
527 | /* between path and slash is the name of the | |
528 | * subtree to look for. | |
529 | */ | |
530 | sub = find_subtree(it, path, slash - path, 0); | |
531 | if (!sub) | |
532 | return NULL; | |
533 | it = sub->cache_tree; | |
534 | if (slash) | |
535 | while (*slash && *slash == '/') | |
536 | slash++; | |
537 | if (!slash || !*slash) | |
538 | return it; /* prefix ended with slashes */ | |
539 | path = slash; | |
540 | } | |
541 | return it; | |
542 | } | |
45525bd0 | 543 | |
d11b8d34 | 544 | int write_cache_as_tree(unsigned char *sha1, int flags, const char *prefix) |
45525bd0 JH |
545 | { |
546 | int entries, was_valid, newfd; | |
d11b8d34 | 547 | struct lock_file *lock_file; |
45525bd0 JH |
548 | |
549 | /* | |
550 | * We can't free this memory, it becomes part of a linked list | |
551 | * parsed atexit() | |
552 | */ | |
d11b8d34 | 553 | lock_file = xcalloc(1, sizeof(struct lock_file)); |
45525bd0 JH |
554 | |
555 | newfd = hold_locked_index(lock_file, 1); | |
556 | ||
557 | entries = read_cache(); | |
558 | if (entries < 0) | |
559 | return WRITE_TREE_UNREADABLE_INDEX; | |
d11b8d34 JH |
560 | if (flags & WRITE_TREE_IGNORE_CACHE_TREE) |
561 | cache_tree_free(&(active_cache_tree)); | |
45525bd0 JH |
562 | |
563 | if (!active_cache_tree) | |
564 | active_cache_tree = cache_tree(); | |
565 | ||
566 | was_valid = cache_tree_fully_valid(active_cache_tree); | |
45525bd0 | 567 | if (!was_valid) { |
d11b8d34 JH |
568 | int missing_ok = flags & WRITE_TREE_MISSING_OK; |
569 | ||
45525bd0 JH |
570 | if (cache_tree_update(active_cache_tree, |
571 | active_cache, active_nr, | |
572 | missing_ok, 0) < 0) | |
573 | return WRITE_TREE_UNMERGED_INDEX; | |
574 | if (0 <= newfd) { | |
575 | if (!write_cache(newfd, active_cache, active_nr) && | |
576 | !commit_lock_file(lock_file)) | |
577 | newfd = -1; | |
578 | } | |
579 | /* Not being able to write is fine -- we are only interested | |
580 | * in updating the cache-tree part, and if the next caller | |
581 | * ends up using the old index with unupdated cache-tree part | |
582 | * it misses the work we did here, but that is just a | |
583 | * performance penalty and not a big deal. | |
584 | */ | |
585 | } | |
586 | ||
587 | if (prefix) { | |
588 | struct cache_tree *subtree = | |
589 | cache_tree_find(active_cache_tree, prefix); | |
590 | if (!subtree) | |
591 | return WRITE_TREE_PREFIX_ERROR; | |
592 | hashcpy(sha1, subtree->sha1); | |
593 | } | |
594 | else | |
595 | hashcpy(sha1, active_cache_tree->sha1); | |
596 | ||
597 | if (0 <= newfd) | |
598 | rollback_lock_file(lock_file); | |
599 | ||
600 | return 0; | |
601 | } | |
b9d37a54 JH |
602 | |
603 | static void prime_cache_tree_rec(struct cache_tree *it, struct tree *tree) | |
604 | { | |
605 | struct tree_desc desc; | |
606 | struct name_entry entry; | |
607 | int cnt; | |
608 | ||
609 | hashcpy(it->sha1, tree->object.sha1); | |
610 | init_tree_desc(&desc, tree->buffer, tree->size); | |
611 | cnt = 0; | |
612 | while (tree_entry(&desc, &entry)) { | |
613 | if (!S_ISDIR(entry.mode)) | |
614 | cnt++; | |
615 | else { | |
616 | struct cache_tree_sub *sub; | |
617 | struct tree *subtree = lookup_tree(entry.sha1); | |
618 | if (!subtree->object.parsed) | |
619 | parse_tree(subtree); | |
620 | sub = cache_tree_sub(it, entry.path); | |
621 | sub->cache_tree = cache_tree(); | |
622 | prime_cache_tree_rec(sub->cache_tree, subtree); | |
623 | cnt += sub->cache_tree->entry_count; | |
624 | } | |
625 | } | |
626 | it->entry_count = cnt; | |
627 | } | |
628 | ||
629 | void prime_cache_tree(struct cache_tree **it, struct tree *tree) | |
630 | { | |
631 | cache_tree_free(it); | |
632 | *it = cache_tree(); | |
633 | prime_cache_tree_rec(*it, tree); | |
634 | } | |
b65982b6 JH |
635 | |
636 | /* | |
637 | * find the cache_tree that corresponds to the current level without | |
638 | * exploding the full path into textual form. The root of the | |
639 | * cache tree is given as "root", and our current level is "info". | |
640 | * (1) When at root level, info->prev is NULL, so it is "root" itself. | |
641 | * (2) Otherwise, find the cache_tree that corresponds to one level | |
642 | * above us, and find ourselves in there. | |
643 | */ | |
644 | static struct cache_tree *find_cache_tree_from_traversal(struct cache_tree *root, | |
645 | struct traverse_info *info) | |
646 | { | |
647 | struct cache_tree *our_parent; | |
648 | ||
649 | if (!info->prev) | |
650 | return root; | |
651 | our_parent = find_cache_tree_from_traversal(root, info->prev); | |
652 | return cache_tree_find(our_parent, info->name.path); | |
653 | } | |
654 | ||
655 | int cache_tree_matches_traversal(struct cache_tree *root, | |
656 | struct name_entry *ent, | |
657 | struct traverse_info *info) | |
658 | { | |
659 | struct cache_tree *it; | |
660 | ||
661 | it = find_cache_tree_from_traversal(root, info); | |
662 | it = cache_tree_find(it, ent->path); | |
663 | if (it && it->entry_count > 0 && !hashcmp(ent->sha1, it->sha1)) | |
664 | return it->entry_count; | |
665 | return 0; | |
666 | } |