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Commit | Line | Data |
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8f3f9b09 JH |
1 | #include "cache.h" |
2 | #include "refs.h" | |
3 | #include "object.h" | |
4 | #include "commit.h" | |
b614e3d7 | 5 | #include "tag.h" |
8f3f9b09 JH |
6 | |
7 | /* refs */ | |
8 | static FILE *info_ref_fp; | |
8f3f9b09 JH |
9 | |
10 | static int add_info_ref(const char *path, const unsigned char *sha1) | |
11 | { | |
f6b42a81 JH |
12 | struct object *o = parse_object(sha1); |
13 | ||
8f3f9b09 | 14 | fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path); |
f6b42a81 | 15 | if (o->type == tag_type) { |
9534f40b JH |
16 | o = deref_tag(o, path, 0); |
17 | if (o) | |
18 | fprintf(info_ref_fp, "%s %s^{}\n", | |
19 | sha1_to_hex(o->sha1), path); | |
f6b42a81 | 20 | } |
8f3f9b09 JH |
21 | return 0; |
22 | } | |
23 | ||
24 | static int update_info_refs(int force) | |
25 | { | |
8f3f9b09 JH |
26 | char *path0 = strdup(git_path("info/refs")); |
27 | int len = strlen(path0); | |
28 | char *path1 = xmalloc(len + 2); | |
29 | ||
30 | strcpy(path1, path0); | |
31 | strcpy(path1 + len, "+"); | |
32 | ||
8f3f9b09 JH |
33 | safe_create_leading_directories(path0); |
34 | info_ref_fp = fopen(path1, "w"); | |
35 | if (!info_ref_fp) | |
36 | return error("unable to update %s", path0); | |
37 | for_each_ref(add_info_ref); | |
38 | fclose(info_ref_fp); | |
39 | rename(path1, path0); | |
40 | free(path0); | |
41 | free(path1); | |
42 | return 0; | |
43 | } | |
44 | ||
45 | /* packs */ | |
4d8fa916 | 46 | static struct pack_info { |
8f3f9b09 JH |
47 | unsigned long latest; |
48 | struct packed_git *p; | |
49 | int old_num; | |
50 | int new_num; | |
51 | int nr_alloc; | |
52 | int nr_heads; | |
53 | unsigned char (*head)[20]; | |
2c04662d | 54 | char dep[0]; /* more */ |
8f3f9b09 JH |
55 | } **info; |
56 | static int num_pack; | |
57 | static const char *objdir; | |
58 | static int objdirlen; | |
59 | ||
60 | static struct object *parse_object_cheap(const unsigned char *sha1) | |
61 | { | |
62 | struct object *o; | |
63 | ||
64 | if ((o = parse_object(sha1)) == NULL) | |
65 | return NULL; | |
66 | if (o->type == commit_type) { | |
67 | struct commit *commit = (struct commit *)o; | |
68 | free(commit->buffer); | |
69 | commit->buffer = NULL; | |
f22ca7c5 RF |
70 | } else if (o->type == tree_type) { |
71 | struct tree *tree = (struct tree *)o; | |
72 | struct tree_entry_list *e, *n; | |
73 | for (e = tree->entries; e; e = n) { | |
74 | free(e->name); | |
75 | e->name = NULL; | |
76 | n = e->next; | |
77 | free(e); | |
78 | } | |
79 | tree->entries = NULL; | |
8f3f9b09 JH |
80 | } |
81 | return o; | |
82 | } | |
83 | ||
84 | static struct pack_info *find_pack_by_name(const char *name) | |
85 | { | |
86 | int i; | |
87 | for (i = 0; i < num_pack; i++) { | |
88 | struct packed_git *p = info[i]->p; | |
89 | /* skip "/pack/" after ".git/objects" */ | |
90 | if (!strcmp(p->pack_name + objdirlen + 6, name)) | |
91 | return info[i]; | |
92 | } | |
93 | return NULL; | |
94 | } | |
95 | ||
96 | static struct pack_info *find_pack_by_old_num(int old_num) | |
97 | { | |
98 | int i; | |
99 | for (i = 0; i < num_pack; i++) | |
100 | if (info[i]->old_num == old_num) | |
101 | return info[i]; | |
102 | return NULL; | |
103 | } | |
104 | ||
105 | static int add_head_def(struct pack_info *this, unsigned char *sha1) | |
106 | { | |
107 | if (this->nr_alloc <= this->nr_heads) { | |
108 | this->nr_alloc = alloc_nr(this->nr_alloc); | |
109 | this->head = xrealloc(this->head, this->nr_alloc * 20); | |
110 | } | |
111 | memcpy(this->head[this->nr_heads++], sha1, 20); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | /* Returns non-zero when we detect that the info in the | |
116 | * old file is useless. | |
117 | */ | |
118 | static int parse_pack_def(const char *line, int old_cnt) | |
119 | { | |
120 | struct pack_info *i = find_pack_by_name(line + 2); | |
121 | if (i) { | |
122 | i->old_num = old_cnt; | |
123 | return 0; | |
124 | } | |
125 | else { | |
126 | /* The file describes a pack that is no longer here; | |
127 | * dependencies between packs needs to be recalculated. | |
128 | */ | |
129 | return 1; | |
130 | } | |
131 | } | |
132 | ||
133 | /* Returns non-zero when we detect that the info in the | |
134 | * old file is useless. | |
135 | */ | |
136 | static int parse_depend_def(char *line) | |
137 | { | |
138 | unsigned long num; | |
139 | char *cp, *ep; | |
140 | struct pack_info *this, *that; | |
141 | ||
142 | cp = line + 2; | |
143 | num = strtoul(cp, &ep, 10); | |
144 | if (ep == cp) | |
145 | return error("invalid input %s", line); | |
146 | this = find_pack_by_old_num(num); | |
147 | if (!this) | |
148 | return 0; | |
149 | while (ep && *(cp = ep)) { | |
150 | num = strtoul(cp, &ep, 10); | |
151 | if (ep == cp) | |
152 | break; | |
153 | that = find_pack_by_old_num(num); | |
154 | if (!that) | |
155 | /* The pack this one depends on does not | |
156 | * exist; this should not happen because | |
157 | * we write out the list of packs first and | |
158 | * then dependency information, but it means | |
159 | * the file is useless anyway. | |
160 | */ | |
161 | return 1; | |
162 | this->dep[that->new_num] = 1; | |
163 | } | |
164 | return 0; | |
165 | } | |
166 | ||
167 | /* Returns non-zero when we detect that the info in the | |
168 | * old file is useless. | |
169 | */ | |
170 | static int parse_head_def(char *line) | |
171 | { | |
172 | unsigned char sha1[20]; | |
173 | unsigned long num; | |
174 | char *cp, *ep; | |
175 | struct pack_info *this; | |
176 | struct object *o; | |
177 | ||
178 | cp = line + 2; | |
179 | num = strtoul(cp, &ep, 10); | |
180 | if (ep == cp || *ep++ != ' ') | |
181 | return error("invalid input ix %s", line); | |
182 | this = find_pack_by_old_num(num); | |
183 | if (!this) | |
184 | return 1; /* You know the drill. */ | |
185 | if (get_sha1_hex(ep, sha1) || ep[40] != ' ') | |
186 | return error("invalid input sha1 %s (%s)", line, ep); | |
187 | if ((o = parse_object_cheap(sha1)) == NULL) | |
188 | return error("no such object: %s", line); | |
189 | return add_head_def(this, sha1); | |
190 | } | |
191 | ||
192 | /* Returns non-zero when we detect that the info in the | |
193 | * old file is useless. | |
194 | */ | |
195 | static int read_pack_info_file(const char *infofile) | |
196 | { | |
197 | FILE *fp; | |
198 | char line[1000]; | |
199 | int old_cnt = 0; | |
200 | ||
201 | fp = fopen(infofile, "r"); | |
202 | if (!fp) | |
203 | return 1; /* nonexisting is not an error. */ | |
204 | ||
205 | while (fgets(line, sizeof(line), fp)) { | |
206 | int len = strlen(line); | |
207 | if (line[len-1] == '\n') | |
208 | line[len-1] = 0; | |
209 | ||
210 | switch (line[0]) { | |
211 | case 'P': /* P name */ | |
212 | if (parse_pack_def(line, old_cnt++)) | |
213 | goto out_stale; | |
214 | break; | |
215 | case 'D': /* D ix dep-ix1 dep-ix2... */ | |
216 | if (parse_depend_def(line)) | |
217 | goto out_stale; | |
218 | break; | |
219 | case 'T': /* T ix sha1 type */ | |
220 | if (parse_head_def(line)) | |
221 | goto out_stale; | |
222 | break; | |
223 | default: | |
224 | error("unrecognized: %s", line); | |
225 | break; | |
226 | } | |
227 | } | |
228 | fclose(fp); | |
229 | return 0; | |
230 | out_stale: | |
231 | fclose(fp); | |
232 | return 1; | |
233 | } | |
234 | ||
235 | /* We sort the packs according to the date of the latest commit. That | |
236 | * in turn indicates how young the pack is, and in general we would | |
237 | * want to depend on younger packs. | |
238 | */ | |
239 | static unsigned long get_latest_commit_date(struct packed_git *p) | |
240 | { | |
241 | unsigned char sha1[20]; | |
242 | struct object *o; | |
243 | int num = num_packed_objects(p); | |
244 | int i; | |
245 | unsigned long latest = 0; | |
246 | ||
247 | for (i = 0; i < num; i++) { | |
248 | if (nth_packed_object_sha1(p, i, sha1)) | |
249 | die("corrupt pack file %s?", p->pack_name); | |
250 | if ((o = parse_object_cheap(sha1)) == NULL) | |
251 | die("cannot parse %s", sha1_to_hex(sha1)); | |
252 | if (o->type == commit_type) { | |
253 | struct commit *commit = (struct commit *)o; | |
254 | if (latest < commit->date) | |
255 | latest = commit->date; | |
256 | } | |
257 | } | |
258 | return latest; | |
259 | } | |
260 | ||
261 | static int compare_info(const void *a_, const void *b_) | |
262 | { | |
263 | struct pack_info * const* a = a_; | |
264 | struct pack_info * const* b = b_; | |
265 | ||
266 | if (0 <= (*a)->old_num && 0 <= (*b)->old_num) | |
267 | /* Keep the order in the original */ | |
268 | return (*a)->old_num - (*b)->old_num; | |
269 | else if (0 <= (*a)->old_num) | |
270 | /* Only A existed in the original so B is obviously newer */ | |
271 | return -1; | |
272 | else if (0 <= (*b)->old_num) | |
273 | /* The other way around. */ | |
274 | return 1; | |
275 | ||
276 | if ((*a)->latest < (*b)->latest) | |
277 | return -1; | |
278 | else if ((*a)->latest == (*b)->latest) | |
279 | return 0; | |
280 | else | |
281 | return 1; | |
282 | } | |
283 | ||
284 | static void init_pack_info(const char *infofile, int force) | |
285 | { | |
286 | struct packed_git *p; | |
287 | int stale; | |
288 | int i = 0; | |
289 | char *dep_temp; | |
290 | ||
291 | objdir = get_object_directory(); | |
292 | objdirlen = strlen(objdir); | |
293 | ||
294 | prepare_packed_git(); | |
295 | for (p = packed_git; p; p = p->next) { | |
296 | /* we ignore things on alternate path since they are | |
297 | * not available to the pullers in general. | |
298 | */ | |
299 | if (strncmp(p->pack_name, objdir, objdirlen) || | |
300 | strncmp(p->pack_name + objdirlen, "/pack/", 6)) | |
301 | continue; | |
302 | i++; | |
303 | } | |
304 | num_pack = i; | |
305 | info = xcalloc(num_pack, sizeof(struct pack_info *)); | |
306 | for (i = 0, p = packed_git; p; p = p->next) { | |
307 | if (strncmp(p->pack_name, objdir, objdirlen) || | |
308 | p->pack_name[objdirlen] != '/') | |
309 | continue; | |
310 | info[i] = xcalloc(1, sizeof(struct pack_info) + num_pack); | |
311 | info[i]->p = p; | |
312 | info[i]->old_num = -1; | |
313 | i++; | |
314 | } | |
315 | ||
316 | if (infofile && !force) | |
317 | stale = read_pack_info_file(infofile); | |
318 | else | |
319 | stale = 1; | |
320 | ||
321 | for (i = 0; i < num_pack; i++) { | |
322 | if (stale) { | |
323 | info[i]->old_num = -1; | |
324 | memset(info[i]->dep, 0, num_pack); | |
325 | info[i]->nr_heads = 0; | |
326 | } | |
327 | if (info[i]->old_num < 0) | |
328 | info[i]->latest = get_latest_commit_date(info[i]->p); | |
329 | } | |
330 | ||
331 | qsort(info, num_pack, sizeof(info[0]), compare_info); | |
332 | for (i = 0; i < num_pack; i++) | |
333 | info[i]->new_num = i; | |
334 | ||
335 | /* we need to fix up the dependency information | |
336 | * for the old ones. | |
337 | */ | |
338 | dep_temp = NULL; | |
339 | for (i = 0; i < num_pack; i++) { | |
340 | int old; | |
341 | ||
342 | if (info[i]->old_num < 0) | |
343 | continue; | |
344 | if (! dep_temp) | |
345 | dep_temp = xmalloc(num_pack); | |
346 | memset(dep_temp, 0, num_pack); | |
347 | for (old = 0; old < num_pack; old++) { | |
348 | struct pack_info *base; | |
349 | if (!info[i]->dep[old]) | |
350 | continue; | |
351 | base = find_pack_by_old_num(old); | |
352 | if (!base) | |
353 | die("internal error renumbering"); | |
354 | dep_temp[base->new_num] = 1; | |
355 | } | |
356 | memcpy(info[i]->dep, dep_temp, num_pack); | |
357 | } | |
358 | free(dep_temp); | |
359 | } | |
360 | ||
361 | static void write_pack_info_file(FILE *fp) | |
362 | { | |
363 | int i, j; | |
364 | for (i = 0; i < num_pack; i++) | |
365 | fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6); | |
366 | ||
367 | for (i = 0; i < num_pack; i++) { | |
368 | fprintf(fp, "D %1d", i); | |
369 | for (j = 0; j < num_pack; j++) { | |
370 | if ((i == j) || !(info[i]->dep[j])) | |
371 | continue; | |
372 | fprintf(fp, " %1d", j); | |
373 | } | |
374 | fputc('\n', fp); | |
375 | } | |
376 | ||
377 | for (i = 0; i < num_pack; i++) { | |
378 | struct pack_info *this = info[i]; | |
379 | for (j = 0; j < this->nr_heads; j++) { | |
380 | struct object *o = lookup_object(this->head[j]); | |
381 | fprintf(fp, "T %1d %s %s\n", | |
382 | i, sha1_to_hex(this->head[j]), o->type); | |
383 | } | |
384 | } | |
385 | ||
386 | } | |
387 | ||
388 | #define REFERENCED 01 | |
389 | #define INTERNAL 02 | |
390 | #define EMITTED 04 | |
391 | ||
392 | static void show(struct object *o, int pack_ix) | |
393 | { | |
394 | /* | |
395 | * We are interested in objects that are not referenced, | |
396 | * and objects that are referenced but not internal. | |
397 | */ | |
398 | if (o->flags & EMITTED) | |
399 | return; | |
400 | ||
401 | if (!(o->flags & REFERENCED)) | |
402 | add_head_def(info[pack_ix], o->sha1); | |
403 | else if ((o->flags & REFERENCED) && !(o->flags & INTERNAL)) { | |
404 | int i; | |
405 | ||
406 | /* Which pack contains this object? That is what | |
407 | * pack_ix can depend on. We earlier sorted info | |
408 | * array from youngest to oldest, so try newer packs | |
409 | * first to favor them here. | |
410 | */ | |
411 | for (i = num_pack - 1; 0 <= i; i--) { | |
412 | struct packed_git *p = info[i]->p; | |
413 | struct pack_entry ent; | |
414 | if (find_pack_entry_one(o->sha1, &ent, p)) { | |
415 | info[pack_ix]->dep[i] = 1; | |
416 | break; | |
417 | } | |
418 | } | |
419 | } | |
420 | o->flags |= EMITTED; | |
421 | } | |
422 | ||
423 | static void find_pack_info_one(int pack_ix) | |
424 | { | |
425 | unsigned char sha1[20]; | |
426 | struct object *o; | |
8f3f9b09 JH |
427 | int i; |
428 | struct packed_git *p = info[pack_ix]->p; | |
429 | int num = num_packed_objects(p); | |
430 | ||
431 | /* Scan objects, clear flags from all the edge ones and | |
432 | * internal ones, possibly marked in the previous round. | |
433 | */ | |
434 | for (i = 0; i < num; i++) { | |
435 | if (nth_packed_object_sha1(p, i, sha1)) | |
436 | die("corrupt pack file %s?", p->pack_name); | |
437 | if ((o = lookup_object(sha1)) == NULL) | |
438 | die("cannot parse %s", sha1_to_hex(sha1)); | |
4a4e6fd7 SV |
439 | if (o->refs) { |
440 | struct object_refs *refs = o->refs; | |
441 | int j; | |
442 | for (j = 0; j < refs->count; j++) | |
443 | refs->ref[j]->flags = 0; | |
444 | } | |
8f3f9b09 JH |
445 | o->flags = 0; |
446 | } | |
447 | ||
448 | /* Mark all the internal ones */ | |
449 | for (i = 0; i < num; i++) { | |
450 | if (nth_packed_object_sha1(p, i, sha1)) | |
451 | die("corrupt pack file %s?", p->pack_name); | |
452 | if ((o = lookup_object(sha1)) == NULL) | |
453 | die("cannot find %s", sha1_to_hex(sha1)); | |
4a4e6fd7 SV |
454 | if (o->refs) { |
455 | struct object_refs *refs = o->refs; | |
456 | int j; | |
457 | for (j = 0; j < refs->count; j++) | |
458 | refs->ref[j]->flags |= REFERENCED; | |
459 | } | |
8f3f9b09 JH |
460 | o->flags |= INTERNAL; |
461 | } | |
462 | ||
463 | for (i = 0; i < num; i++) { | |
464 | if (nth_packed_object_sha1(p, i, sha1)) | |
465 | die("corrupt pack file %s?", p->pack_name); | |
466 | if ((o = lookup_object(sha1)) == NULL) | |
467 | die("cannot find %s", sha1_to_hex(sha1)); | |
468 | ||
469 | show(o, pack_ix); | |
4a4e6fd7 SV |
470 | if (o->refs) { |
471 | struct object_refs *refs = o->refs; | |
472 | int j; | |
473 | for (j = 0; j < refs->count; j++) | |
474 | show(refs->ref[j], pack_ix); | |
475 | } | |
8f3f9b09 JH |
476 | } |
477 | ||
478 | } | |
479 | ||
480 | static void find_pack_info(void) | |
481 | { | |
482 | int i; | |
483 | for (i = 0; i < num_pack; i++) { | |
484 | /* The packed objects are cast in stone, and a head | |
485 | * in a pack will stay as head, so is the set of missing | |
486 | * objects. If the repo has been reorganized and we | |
487 | * are missing some packs available back then, we have | |
488 | * already discarded the info read from the file, so | |
489 | * we will find (old_num < 0) in that case. | |
490 | */ | |
491 | if (0 <= info[i]->old_num) | |
492 | continue; | |
493 | find_pack_info_one(i); | |
494 | } | |
495 | } | |
496 | ||
497 | static int update_info_packs(int force) | |
498 | { | |
499 | char infofile[PATH_MAX]; | |
500 | char name[PATH_MAX]; | |
501 | int namelen; | |
502 | FILE *fp; | |
503 | ||
504 | namelen = sprintf(infofile, "%s/info/packs", get_object_directory()); | |
505 | strcpy(name, infofile); | |
506 | strcpy(name + namelen, "+"); | |
507 | ||
508 | init_pack_info(infofile, force); | |
509 | find_pack_info(); | |
510 | ||
511 | safe_create_leading_directories(name); | |
512 | fp = fopen(name, "w"); | |
513 | if (!fp) | |
514 | return error("cannot open %s", name); | |
515 | write_pack_info_file(fp); | |
516 | fclose(fp); | |
517 | rename(name, infofile); | |
518 | return 0; | |
519 | } | |
520 | ||
8f3f9b09 JH |
521 | /* public */ |
522 | int update_server_info(int force) | |
523 | { | |
524 | /* We would add more dumb-server support files later, | |
525 | * including index of available pack files and their | |
526 | * intended audiences. | |
527 | */ | |
528 | int errs = 0; | |
529 | ||
530 | errs = errs | update_info_refs(force); | |
531 | errs = errs | update_info_packs(force); | |
8f3f9b09 JH |
532 | |
533 | return errs; | |
534 | } |