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1 | #include "cache.h" | |
2 | #include "commit.h" | |
3 | #include "walker.h" | |
4 | #include "http.h" | |
5 | ||
6 | struct alt_base { | |
7 | char *base; | |
8 | int got_indices; | |
9 | struct packed_git *packs; | |
10 | struct alt_base *next; | |
11 | }; | |
12 | ||
13 | enum object_request_state { | |
14 | WAITING, | |
15 | ABORTED, | |
16 | ACTIVE, | |
17 | COMPLETE | |
18 | }; | |
19 | ||
20 | struct object_request { | |
21 | struct walker *walker; | |
22 | unsigned char sha1[20]; | |
23 | struct alt_base *repo; | |
24 | enum object_request_state state; | |
25 | struct http_object_request *req; | |
26 | struct object_request *next; | |
27 | }; | |
28 | ||
29 | struct alternates_request { | |
30 | struct walker *walker; | |
31 | const char *base; | |
32 | char *url; | |
33 | struct strbuf *buffer; | |
34 | struct active_request_slot *slot; | |
35 | int http_specific; | |
36 | }; | |
37 | ||
38 | struct walker_data { | |
39 | const char *url; | |
40 | int got_alternates; | |
41 | struct alt_base *alt; | |
42 | }; | |
43 | ||
44 | static struct object_request *object_queue_head; | |
45 | ||
46 | static void fetch_alternates(struct walker *walker, const char *base); | |
47 | ||
48 | static void process_object_response(void *callback_data); | |
49 | ||
50 | static void start_object_request(struct walker *walker, | |
51 | struct object_request *obj_req) | |
52 | { | |
53 | struct active_request_slot *slot; | |
54 | struct http_object_request *req; | |
55 | ||
56 | req = new_http_object_request(obj_req->repo->base, obj_req->sha1); | |
57 | if (req == NULL) { | |
58 | obj_req->state = ABORTED; | |
59 | return; | |
60 | } | |
61 | obj_req->req = req; | |
62 | ||
63 | slot = req->slot; | |
64 | slot->callback_func = process_object_response; | |
65 | slot->callback_data = obj_req; | |
66 | ||
67 | /* Try to get the request started, abort the request on error */ | |
68 | obj_req->state = ACTIVE; | |
69 | if (!start_active_slot(slot)) { | |
70 | obj_req->state = ABORTED; | |
71 | release_http_object_request(req); | |
72 | return; | |
73 | } | |
74 | } | |
75 | ||
76 | static void finish_object_request(struct object_request *obj_req) | |
77 | { | |
78 | if (finish_http_object_request(obj_req->req)) | |
79 | return; | |
80 | ||
81 | if (obj_req->req->rename == 0) | |
82 | walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1)); | |
83 | } | |
84 | ||
85 | static void process_object_response(void *callback_data) | |
86 | { | |
87 | struct object_request *obj_req = | |
88 | (struct object_request *)callback_data; | |
89 | struct walker *walker = obj_req->walker; | |
90 | struct walker_data *data = walker->data; | |
91 | struct alt_base *alt = data->alt; | |
92 | ||
93 | process_http_object_request(obj_req->req); | |
94 | obj_req->state = COMPLETE; | |
95 | ||
96 | /* Use alternates if necessary */ | |
97 | if (missing_target(obj_req->req)) { | |
98 | fetch_alternates(walker, alt->base); | |
99 | if (obj_req->repo->next != NULL) { | |
100 | obj_req->repo = | |
101 | obj_req->repo->next; | |
102 | release_http_object_request(obj_req->req); | |
103 | start_object_request(walker, obj_req); | |
104 | return; | |
105 | } | |
106 | } | |
107 | ||
108 | finish_object_request(obj_req); | |
109 | } | |
110 | ||
111 | static void release_object_request(struct object_request *obj_req) | |
112 | { | |
113 | struct object_request *entry = object_queue_head; | |
114 | ||
115 | if (obj_req->req !=NULL && obj_req->req->localfile != -1) | |
116 | error("fd leakage in release: %d", obj_req->req->localfile); | |
117 | if (obj_req == object_queue_head) { | |
118 | object_queue_head = obj_req->next; | |
119 | } else { | |
120 | while (entry->next != NULL && entry->next != obj_req) | |
121 | entry = entry->next; | |
122 | if (entry->next == obj_req) | |
123 | entry->next = entry->next->next; | |
124 | } | |
125 | ||
126 | free(obj_req); | |
127 | } | |
128 | ||
129 | #ifdef USE_CURL_MULTI | |
130 | static int fill_active_slot(struct walker *walker) | |
131 | { | |
132 | struct object_request *obj_req; | |
133 | ||
134 | for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) { | |
135 | if (obj_req->state == WAITING) { | |
136 | if (has_sha1_file(obj_req->sha1)) | |
137 | obj_req->state = COMPLETE; | |
138 | else { | |
139 | start_object_request(walker, obj_req); | |
140 | return 1; | |
141 | } | |
142 | } | |
143 | } | |
144 | return 0; | |
145 | } | |
146 | #endif | |
147 | ||
148 | static void prefetch(struct walker *walker, unsigned char *sha1) | |
149 | { | |
150 | struct object_request *newreq; | |
151 | struct object_request *tail; | |
152 | struct walker_data *data = walker->data; | |
153 | ||
154 | newreq = xmalloc(sizeof(*newreq)); | |
155 | newreq->walker = walker; | |
156 | hashcpy(newreq->sha1, sha1); | |
157 | newreq->repo = data->alt; | |
158 | newreq->state = WAITING; | |
159 | newreq->req = NULL; | |
160 | newreq->next = NULL; | |
161 | ||
162 | http_is_verbose = walker->get_verbosely; | |
163 | ||
164 | if (object_queue_head == NULL) { | |
165 | object_queue_head = newreq; | |
166 | } else { | |
167 | tail = object_queue_head; | |
168 | while (tail->next != NULL) | |
169 | tail = tail->next; | |
170 | tail->next = newreq; | |
171 | } | |
172 | ||
173 | #ifdef USE_CURL_MULTI | |
174 | fill_active_slots(); | |
175 | step_active_slots(); | |
176 | #endif | |
177 | } | |
178 | ||
179 | static void process_alternates_response(void *callback_data) | |
180 | { | |
181 | struct alternates_request *alt_req = | |
182 | (struct alternates_request *)callback_data; | |
183 | struct walker *walker = alt_req->walker; | |
184 | struct walker_data *cdata = walker->data; | |
185 | struct active_request_slot *slot = alt_req->slot; | |
186 | struct alt_base *tail = cdata->alt; | |
187 | const char *base = alt_req->base; | |
188 | const char null_byte = '\0'; | |
189 | char *data; | |
190 | int i = 0; | |
191 | ||
192 | if (alt_req->http_specific) { | |
193 | if (slot->curl_result != CURLE_OK || | |
194 | !alt_req->buffer->len) { | |
195 | ||
196 | /* Try reusing the slot to get non-http alternates */ | |
197 | alt_req->http_specific = 0; | |
198 | sprintf(alt_req->url, "%s/objects/info/alternates", | |
199 | base); | |
200 | curl_easy_setopt(slot->curl, CURLOPT_URL, | |
201 | alt_req->url); | |
202 | active_requests++; | |
203 | slot->in_use = 1; | |
204 | if (slot->finished != NULL) | |
205 | (*slot->finished) = 0; | |
206 | if (!start_active_slot(slot)) { | |
207 | cdata->got_alternates = -1; | |
208 | slot->in_use = 0; | |
209 | if (slot->finished != NULL) | |
210 | (*slot->finished) = 1; | |
211 | } | |
212 | return; | |
213 | } | |
214 | } else if (slot->curl_result != CURLE_OK) { | |
215 | if (!missing_target(slot)) { | |
216 | cdata->got_alternates = -1; | |
217 | return; | |
218 | } | |
219 | } | |
220 | ||
221 | fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer); | |
222 | alt_req->buffer->len--; | |
223 | data = alt_req->buffer->buf; | |
224 | ||
225 | while (i < alt_req->buffer->len) { | |
226 | int posn = i; | |
227 | while (posn < alt_req->buffer->len && data[posn] != '\n') | |
228 | posn++; | |
229 | if (data[posn] == '\n') { | |
230 | int okay = 0; | |
231 | int serverlen = 0; | |
232 | struct alt_base *newalt; | |
233 | char *target = NULL; | |
234 | if (data[i] == '/') { | |
235 | /* | |
236 | * This counts | |
237 | * http://git.host/pub/scm/linux.git/ | |
238 | * -----------here^ | |
239 | * so memcpy(dst, base, serverlen) will | |
240 | * copy up to "...git.host". | |
241 | */ | |
242 | const char *colon_ss = strstr(base,"://"); | |
243 | if (colon_ss) { | |
244 | serverlen = (strchr(colon_ss + 3, '/') | |
245 | - base); | |
246 | okay = 1; | |
247 | } | |
248 | } else if (!memcmp(data + i, "../", 3)) { | |
249 | /* | |
250 | * Relative URL; chop the corresponding | |
251 | * number of subpath from base (and ../ | |
252 | * from data), and concatenate the result. | |
253 | * | |
254 | * The code first drops ../ from data, and | |
255 | * then drops one ../ from data and one path | |
256 | * from base. IOW, one extra ../ is dropped | |
257 | * from data than path is dropped from base. | |
258 | * | |
259 | * This is not wrong. The alternate in | |
260 | * http://git.host/pub/scm/linux.git/ | |
261 | * to borrow from | |
262 | * http://git.host/pub/scm/linus.git/ | |
263 | * is ../../linus.git/objects/. You need | |
264 | * two ../../ to borrow from your direct | |
265 | * neighbour. | |
266 | */ | |
267 | i += 3; | |
268 | serverlen = strlen(base); | |
269 | while (i + 2 < posn && | |
270 | !memcmp(data + i, "../", 3)) { | |
271 | do { | |
272 | serverlen--; | |
273 | } while (serverlen && | |
274 | base[serverlen - 1] != '/'); | |
275 | i += 3; | |
276 | } | |
277 | /* If the server got removed, give up. */ | |
278 | okay = strchr(base, ':') - base + 3 < | |
279 | serverlen; | |
280 | } else if (alt_req->http_specific) { | |
281 | char *colon = strchr(data + i, ':'); | |
282 | char *slash = strchr(data + i, '/'); | |
283 | if (colon && slash && colon < data + posn && | |
284 | slash < data + posn && colon < slash) { | |
285 | okay = 1; | |
286 | } | |
287 | } | |
288 | /* skip "objects\n" at end */ | |
289 | if (okay) { | |
290 | target = xmalloc(serverlen + posn - i - 6); | |
291 | memcpy(target, base, serverlen); | |
292 | memcpy(target + serverlen, data + i, | |
293 | posn - i - 7); | |
294 | target[serverlen + posn - i - 7] = 0; | |
295 | if (walker->get_verbosely) | |
296 | fprintf(stderr, | |
297 | "Also look at %s\n", target); | |
298 | newalt = xmalloc(sizeof(*newalt)); | |
299 | newalt->next = NULL; | |
300 | newalt->base = target; | |
301 | newalt->got_indices = 0; | |
302 | newalt->packs = NULL; | |
303 | ||
304 | while (tail->next != NULL) | |
305 | tail = tail->next; | |
306 | tail->next = newalt; | |
307 | } | |
308 | } | |
309 | i = posn + 1; | |
310 | } | |
311 | ||
312 | cdata->got_alternates = 1; | |
313 | } | |
314 | ||
315 | static void fetch_alternates(struct walker *walker, const char *base) | |
316 | { | |
317 | struct strbuf buffer = STRBUF_INIT; | |
318 | char *url; | |
319 | struct active_request_slot *slot; | |
320 | struct alternates_request alt_req; | |
321 | struct walker_data *cdata = walker->data; | |
322 | ||
323 | /* | |
324 | * If another request has already started fetching alternates, | |
325 | * wait for them to arrive and return to processing this request's | |
326 | * curl message | |
327 | */ | |
328 | #ifdef USE_CURL_MULTI | |
329 | while (cdata->got_alternates == 0) { | |
330 | step_active_slots(); | |
331 | } | |
332 | #endif | |
333 | ||
334 | /* Nothing to do if they've already been fetched */ | |
335 | if (cdata->got_alternates == 1) | |
336 | return; | |
337 | ||
338 | /* Start the fetch */ | |
339 | cdata->got_alternates = 0; | |
340 | ||
341 | if (walker->get_verbosely) | |
342 | fprintf(stderr, "Getting alternates list for %s\n", base); | |
343 | ||
344 | url = xmalloc(strlen(base) + 31); | |
345 | sprintf(url, "%s/objects/info/http-alternates", base); | |
346 | ||
347 | /* | |
348 | * Use a callback to process the result, since another request | |
349 | * may fail and need to have alternates loaded before continuing | |
350 | */ | |
351 | slot = get_active_slot(); | |
352 | slot->callback_func = process_alternates_response; | |
353 | alt_req.walker = walker; | |
354 | slot->callback_data = &alt_req; | |
355 | ||
356 | curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); | |
357 | curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); | |
358 | curl_easy_setopt(slot->curl, CURLOPT_URL, url); | |
359 | ||
360 | alt_req.base = base; | |
361 | alt_req.url = url; | |
362 | alt_req.buffer = &buffer; | |
363 | alt_req.http_specific = 1; | |
364 | alt_req.slot = slot; | |
365 | ||
366 | if (start_active_slot(slot)) | |
367 | run_active_slot(slot); | |
368 | else | |
369 | cdata->got_alternates = -1; | |
370 | ||
371 | strbuf_release(&buffer); | |
372 | free(url); | |
373 | } | |
374 | ||
375 | static int fetch_indices(struct walker *walker, struct alt_base *repo) | |
376 | { | |
377 | int ret; | |
378 | ||
379 | if (repo->got_indices) | |
380 | return 0; | |
381 | ||
382 | if (walker->get_verbosely) | |
383 | fprintf(stderr, "Getting pack list for %s\n", repo->base); | |
384 | ||
385 | switch (http_get_info_packs(repo->base, &repo->packs)) { | |
386 | case HTTP_OK: | |
387 | case HTTP_MISSING_TARGET: | |
388 | repo->got_indices = 1; | |
389 | ret = 0; | |
390 | break; | |
391 | default: | |
392 | repo->got_indices = 0; | |
393 | ret = -1; | |
394 | } | |
395 | ||
396 | return ret; | |
397 | } | |
398 | ||
399 | static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1) | |
400 | { | |
401 | struct packed_git *target; | |
402 | int ret; | |
403 | struct slot_results results; | |
404 | struct http_pack_request *preq; | |
405 | ||
406 | if (fetch_indices(walker, repo)) | |
407 | return -1; | |
408 | target = find_sha1_pack(sha1, repo->packs); | |
409 | if (!target) | |
410 | return -1; | |
411 | ||
412 | if (walker->get_verbosely) { | |
413 | fprintf(stderr, "Getting pack %s\n", | |
414 | sha1_to_hex(target->sha1)); | |
415 | fprintf(stderr, " which contains %s\n", | |
416 | sha1_to_hex(sha1)); | |
417 | } | |
418 | ||
419 | preq = new_http_pack_request(target, repo->base); | |
420 | if (preq == NULL) | |
421 | goto abort; | |
422 | preq->lst = &repo->packs; | |
423 | preq->slot->results = &results; | |
424 | ||
425 | if (start_active_slot(preq->slot)) { | |
426 | run_active_slot(preq->slot); | |
427 | if (results.curl_result != CURLE_OK) { | |
428 | error("Unable to get pack file %s\n%s", preq->url, | |
429 | curl_errorstr); | |
430 | goto abort; | |
431 | } | |
432 | } else { | |
433 | error("Unable to start request"); | |
434 | goto abort; | |
435 | } | |
436 | ||
437 | ret = finish_http_pack_request(preq); | |
438 | release_http_pack_request(preq); | |
439 | if (ret) | |
440 | return ret; | |
441 | ||
442 | return 0; | |
443 | ||
444 | abort: | |
445 | return -1; | |
446 | } | |
447 | ||
448 | static void abort_object_request(struct object_request *obj_req) | |
449 | { | |
450 | release_object_request(obj_req); | |
451 | } | |
452 | ||
453 | static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1) | |
454 | { | |
455 | char *hex = sha1_to_hex(sha1); | |
456 | int ret = 0; | |
457 | struct object_request *obj_req = object_queue_head; | |
458 | struct http_object_request *req; | |
459 | ||
460 | while (obj_req != NULL && hashcmp(obj_req->sha1, sha1)) | |
461 | obj_req = obj_req->next; | |
462 | if (obj_req == NULL) | |
463 | return error("Couldn't find request for %s in the queue", hex); | |
464 | ||
465 | if (has_sha1_file(obj_req->sha1)) { | |
466 | if (obj_req->req != NULL) | |
467 | abort_http_object_request(obj_req->req); | |
468 | abort_object_request(obj_req); | |
469 | return 0; | |
470 | } | |
471 | ||
472 | #ifdef USE_CURL_MULTI | |
473 | while (obj_req->state == WAITING) | |
474 | step_active_slots(); | |
475 | #else | |
476 | start_object_request(walker, obj_req); | |
477 | #endif | |
478 | ||
479 | /* | |
480 | * obj_req->req might change when fetching alternates in the callback | |
481 | * process_object_response; therefore, the "shortcut" variable, req, | |
482 | * is used only after we're done with slots. | |
483 | */ | |
484 | while (obj_req->state == ACTIVE) | |
485 | run_active_slot(obj_req->req->slot); | |
486 | ||
487 | req = obj_req->req; | |
488 | ||
489 | if (req->localfile != -1) { | |
490 | close(req->localfile); | |
491 | req->localfile = -1; | |
492 | } | |
493 | ||
494 | if (obj_req->state == ABORTED) { | |
495 | ret = error("Request for %s aborted", hex); | |
496 | } else if (req->curl_result != CURLE_OK && | |
497 | req->http_code != 416) { | |
498 | if (missing_target(req)) | |
499 | ret = -1; /* Be silent, it is probably in a pack. */ | |
500 | else | |
501 | ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)", | |
502 | req->errorstr, req->curl_result, | |
503 | req->http_code, hex); | |
504 | } else if (req->zret != Z_STREAM_END) { | |
505 | walker->corrupt_object_found++; | |
506 | ret = error("File %s (%s) corrupt", hex, req->url); | |
507 | } else if (hashcmp(obj_req->sha1, req->real_sha1)) { | |
508 | ret = error("File %s has bad hash", hex); | |
509 | } else if (req->rename < 0) { | |
510 | ret = error("unable to write sha1 filename %s", | |
511 | sha1_file_name(req->sha1)); | |
512 | } | |
513 | ||
514 | release_http_object_request(req); | |
515 | release_object_request(obj_req); | |
516 | return ret; | |
517 | } | |
518 | ||
519 | static int fetch(struct walker *walker, unsigned char *sha1) | |
520 | { | |
521 | struct walker_data *data = walker->data; | |
522 | struct alt_base *altbase = data->alt; | |
523 | ||
524 | if (!fetch_object(walker, altbase, sha1)) | |
525 | return 0; | |
526 | while (altbase) { | |
527 | if (!fetch_pack(walker, altbase, sha1)) | |
528 | return 0; | |
529 | fetch_alternates(walker, data->alt->base); | |
530 | altbase = altbase->next; | |
531 | } | |
532 | return error("Unable to find %s under %s", sha1_to_hex(sha1), | |
533 | data->alt->base); | |
534 | } | |
535 | ||
536 | static int fetch_ref(struct walker *walker, struct ref *ref) | |
537 | { | |
538 | struct walker_data *data = walker->data; | |
539 | return http_fetch_ref(data->alt->base, ref); | |
540 | } | |
541 | ||
542 | static void cleanup(struct walker *walker) | |
543 | { | |
544 | struct walker_data *data = walker->data; | |
545 | struct alt_base *alt, *alt_next; | |
546 | ||
547 | if (data) { | |
548 | alt = data->alt; | |
549 | while (alt) { | |
550 | alt_next = alt->next; | |
551 | ||
552 | free(alt->base); | |
553 | free(alt); | |
554 | ||
555 | alt = alt_next; | |
556 | } | |
557 | free(data); | |
558 | walker->data = NULL; | |
559 | } | |
560 | } | |
561 | ||
562 | struct walker *get_http_walker(const char *url) | |
563 | { | |
564 | char *s; | |
565 | struct walker_data *data = xmalloc(sizeof(struct walker_data)); | |
566 | struct walker *walker = xmalloc(sizeof(struct walker)); | |
567 | ||
568 | data->alt = xmalloc(sizeof(*data->alt)); | |
569 | data->alt->base = xmalloc(strlen(url) + 1); | |
570 | strcpy(data->alt->base, url); | |
571 | for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s) | |
572 | *s = 0; | |
573 | ||
574 | data->alt->got_indices = 0; | |
575 | data->alt->packs = NULL; | |
576 | data->alt->next = NULL; | |
577 | data->got_alternates = -1; | |
578 | ||
579 | walker->corrupt_object_found = 0; | |
580 | walker->fetch = fetch; | |
581 | walker->fetch_ref = fetch_ref; | |
582 | walker->prefetch = prefetch; | |
583 | walker->cleanup = cleanup; | |
584 | walker->data = data; | |
585 | ||
586 | #ifdef USE_CURL_MULTI | |
587 | add_fill_function(walker, (int (*)(void *)) fill_active_slot); | |
588 | #endif | |
589 | ||
590 | return walker; | |
591 | } |