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1 | #include "cache.h" | |
2 | #include "commit.h" | |
3 | #include "walker.h" | |
4 | #include "http.h" | |
5 | #include "list.h" | |
6 | #include "transport.h" | |
7 | #include "packfile.h" | |
8 | ||
9 | struct alt_base { | |
10 | char *base; | |
11 | int got_indices; | |
12 | struct packed_git *packs; | |
13 | struct alt_base *next; | |
14 | }; | |
15 | ||
16 | enum object_request_state { | |
17 | WAITING, | |
18 | ABORTED, | |
19 | ACTIVE, | |
20 | COMPLETE | |
21 | }; | |
22 | ||
23 | struct object_request { | |
24 | struct walker *walker; | |
25 | unsigned char sha1[20]; | |
26 | struct alt_base *repo; | |
27 | enum object_request_state state; | |
28 | struct http_object_request *req; | |
29 | struct list_head node; | |
30 | }; | |
31 | ||
32 | struct alternates_request { | |
33 | struct walker *walker; | |
34 | const char *base; | |
35 | struct strbuf *url; | |
36 | struct strbuf *buffer; | |
37 | struct active_request_slot *slot; | |
38 | int http_specific; | |
39 | }; | |
40 | ||
41 | struct walker_data { | |
42 | const char *url; | |
43 | int got_alternates; | |
44 | struct alt_base *alt; | |
45 | }; | |
46 | ||
47 | static LIST_HEAD(object_queue_head); | |
48 | ||
49 | static void fetch_alternates(struct walker *walker, const char *base); | |
50 | ||
51 | static void process_object_response(void *callback_data); | |
52 | ||
53 | static void start_object_request(struct walker *walker, | |
54 | struct object_request *obj_req) | |
55 | { | |
56 | struct active_request_slot *slot; | |
57 | struct http_object_request *req; | |
58 | ||
59 | req = new_http_object_request(obj_req->repo->base, obj_req->sha1); | |
60 | if (req == NULL) { | |
61 | obj_req->state = ABORTED; | |
62 | return; | |
63 | } | |
64 | obj_req->req = req; | |
65 | ||
66 | slot = req->slot; | |
67 | slot->callback_func = process_object_response; | |
68 | slot->callback_data = obj_req; | |
69 | ||
70 | /* Try to get the request started, abort the request on error */ | |
71 | obj_req->state = ACTIVE; | |
72 | if (!start_active_slot(slot)) { | |
73 | obj_req->state = ABORTED; | |
74 | release_http_object_request(req); | |
75 | return; | |
76 | } | |
77 | } | |
78 | ||
79 | static void finish_object_request(struct object_request *obj_req) | |
80 | { | |
81 | if (finish_http_object_request(obj_req->req)) | |
82 | return; | |
83 | ||
84 | if (obj_req->req->rename == 0) | |
85 | walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1)); | |
86 | } | |
87 | ||
88 | static void process_object_response(void *callback_data) | |
89 | { | |
90 | struct object_request *obj_req = | |
91 | (struct object_request *)callback_data; | |
92 | struct walker *walker = obj_req->walker; | |
93 | struct walker_data *data = walker->data; | |
94 | struct alt_base *alt = data->alt; | |
95 | ||
96 | process_http_object_request(obj_req->req); | |
97 | obj_req->state = COMPLETE; | |
98 | ||
99 | /* Use alternates if necessary */ | |
100 | if (missing_target(obj_req->req)) { | |
101 | fetch_alternates(walker, alt->base); | |
102 | if (obj_req->repo->next != NULL) { | |
103 | obj_req->repo = | |
104 | obj_req->repo->next; | |
105 | release_http_object_request(obj_req->req); | |
106 | start_object_request(walker, obj_req); | |
107 | return; | |
108 | } | |
109 | } | |
110 | ||
111 | finish_object_request(obj_req); | |
112 | } | |
113 | ||
114 | static void release_object_request(struct object_request *obj_req) | |
115 | { | |
116 | if (obj_req->req !=NULL && obj_req->req->localfile != -1) | |
117 | error("fd leakage in release: %d", obj_req->req->localfile); | |
118 | ||
119 | list_del(&obj_req->node); | |
120 | free(obj_req); | |
121 | } | |
122 | ||
123 | #ifdef USE_CURL_MULTI | |
124 | static int fill_active_slot(struct walker *walker) | |
125 | { | |
126 | struct object_request *obj_req; | |
127 | struct list_head *pos, *tmp, *head = &object_queue_head; | |
128 | ||
129 | list_for_each_safe(pos, tmp, head) { | |
130 | obj_req = list_entry(pos, struct object_request, node); | |
131 | if (obj_req->state == WAITING) { | |
132 | if (has_sha1_file(obj_req->sha1)) | |
133 | obj_req->state = COMPLETE; | |
134 | else { | |
135 | start_object_request(walker, obj_req); | |
136 | return 1; | |
137 | } | |
138 | } | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | #endif | |
143 | ||
144 | static void prefetch(struct walker *walker, unsigned char *sha1) | |
145 | { | |
146 | struct object_request *newreq; | |
147 | struct walker_data *data = walker->data; | |
148 | ||
149 | newreq = xmalloc(sizeof(*newreq)); | |
150 | newreq->walker = walker; | |
151 | hashcpy(newreq->sha1, sha1); | |
152 | newreq->repo = data->alt; | |
153 | newreq->state = WAITING; | |
154 | newreq->req = NULL; | |
155 | ||
156 | http_is_verbose = walker->get_verbosely; | |
157 | list_add_tail(&newreq->node, &object_queue_head); | |
158 | ||
159 | #ifdef USE_CURL_MULTI | |
160 | fill_active_slots(); | |
161 | step_active_slots(); | |
162 | #endif | |
163 | } | |
164 | ||
165 | static int is_alternate_allowed(const char *url) | |
166 | { | |
167 | const char *protocols[] = { | |
168 | "http", "https", "ftp", "ftps" | |
169 | }; | |
170 | int i; | |
171 | ||
172 | if (http_follow_config != HTTP_FOLLOW_ALWAYS) { | |
173 | warning("alternate disabled by http.followRedirects: %s", url); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | for (i = 0; i < ARRAY_SIZE(protocols); i++) { | |
178 | const char *end; | |
179 | if (skip_prefix(url, protocols[i], &end) && | |
180 | starts_with(end, "://")) | |
181 | break; | |
182 | } | |
183 | ||
184 | if (i >= ARRAY_SIZE(protocols)) { | |
185 | warning("ignoring alternate with unknown protocol: %s", url); | |
186 | return 0; | |
187 | } | |
188 | if (!is_transport_allowed(protocols[i], 0)) { | |
189 | warning("ignoring alternate with restricted protocol: %s", url); | |
190 | return 0; | |
191 | } | |
192 | ||
193 | return 1; | |
194 | } | |
195 | ||
196 | static void process_alternates_response(void *callback_data) | |
197 | { | |
198 | struct alternates_request *alt_req = | |
199 | (struct alternates_request *)callback_data; | |
200 | struct walker *walker = alt_req->walker; | |
201 | struct walker_data *cdata = walker->data; | |
202 | struct active_request_slot *slot = alt_req->slot; | |
203 | struct alt_base *tail = cdata->alt; | |
204 | const char *base = alt_req->base; | |
205 | const char null_byte = '\0'; | |
206 | char *data; | |
207 | int i = 0; | |
208 | ||
209 | if (alt_req->http_specific) { | |
210 | if (slot->curl_result != CURLE_OK || | |
211 | !alt_req->buffer->len) { | |
212 | ||
213 | /* Try reusing the slot to get non-http alternates */ | |
214 | alt_req->http_specific = 0; | |
215 | strbuf_reset(alt_req->url); | |
216 | strbuf_addf(alt_req->url, "%s/objects/info/alternates", | |
217 | base); | |
218 | curl_easy_setopt(slot->curl, CURLOPT_URL, | |
219 | alt_req->url->buf); | |
220 | active_requests++; | |
221 | slot->in_use = 1; | |
222 | if (slot->finished != NULL) | |
223 | (*slot->finished) = 0; | |
224 | if (!start_active_slot(slot)) { | |
225 | cdata->got_alternates = -1; | |
226 | slot->in_use = 0; | |
227 | if (slot->finished != NULL) | |
228 | (*slot->finished) = 1; | |
229 | } | |
230 | return; | |
231 | } | |
232 | } else if (slot->curl_result != CURLE_OK) { | |
233 | if (!missing_target(slot)) { | |
234 | cdata->got_alternates = -1; | |
235 | return; | |
236 | } | |
237 | } | |
238 | ||
239 | fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer); | |
240 | alt_req->buffer->len--; | |
241 | data = alt_req->buffer->buf; | |
242 | ||
243 | while (i < alt_req->buffer->len) { | |
244 | int posn = i; | |
245 | while (posn < alt_req->buffer->len && data[posn] != '\n') | |
246 | posn++; | |
247 | if (data[posn] == '\n') { | |
248 | int okay = 0; | |
249 | int serverlen = 0; | |
250 | struct alt_base *newalt; | |
251 | if (data[i] == '/') { | |
252 | /* | |
253 | * This counts | |
254 | * http://git.host/pub/scm/linux.git/ | |
255 | * -----------here^ | |
256 | * so memcpy(dst, base, serverlen) will | |
257 | * copy up to "...git.host". | |
258 | */ | |
259 | const char *colon_ss = strstr(base,"://"); | |
260 | if (colon_ss) { | |
261 | serverlen = (strchr(colon_ss + 3, '/') | |
262 | - base); | |
263 | okay = 1; | |
264 | } | |
265 | } else if (!memcmp(data + i, "../", 3)) { | |
266 | /* | |
267 | * Relative URL; chop the corresponding | |
268 | * number of subpath from base (and ../ | |
269 | * from data), and concatenate the result. | |
270 | * | |
271 | * The code first drops ../ from data, and | |
272 | * then drops one ../ from data and one path | |
273 | * from base. IOW, one extra ../ is dropped | |
274 | * from data than path is dropped from base. | |
275 | * | |
276 | * This is not wrong. The alternate in | |
277 | * http://git.host/pub/scm/linux.git/ | |
278 | * to borrow from | |
279 | * http://git.host/pub/scm/linus.git/ | |
280 | * is ../../linus.git/objects/. You need | |
281 | * two ../../ to borrow from your direct | |
282 | * neighbour. | |
283 | */ | |
284 | i += 3; | |
285 | serverlen = strlen(base); | |
286 | while (i + 2 < posn && | |
287 | !memcmp(data + i, "../", 3)) { | |
288 | do { | |
289 | serverlen--; | |
290 | } while (serverlen && | |
291 | base[serverlen - 1] != '/'); | |
292 | i += 3; | |
293 | } | |
294 | /* If the server got removed, give up. */ | |
295 | okay = strchr(base, ':') - base + 3 < | |
296 | serverlen; | |
297 | } else if (alt_req->http_specific) { | |
298 | char *colon = strchr(data + i, ':'); | |
299 | char *slash = strchr(data + i, '/'); | |
300 | if (colon && slash && colon < data + posn && | |
301 | slash < data + posn && colon < slash) { | |
302 | okay = 1; | |
303 | } | |
304 | } | |
305 | if (okay) { | |
306 | struct strbuf target = STRBUF_INIT; | |
307 | strbuf_add(&target, base, serverlen); | |
308 | strbuf_add(&target, data + i, posn - i); | |
309 | if (!strbuf_strip_suffix(&target, "objects")) { | |
310 | warning("ignoring alternate that does" | |
311 | " not end in 'objects': %s", | |
312 | target.buf); | |
313 | strbuf_release(&target); | |
314 | } else if (is_alternate_allowed(target.buf)) { | |
315 | warning("adding alternate object store: %s", | |
316 | target.buf); | |
317 | newalt = xmalloc(sizeof(*newalt)); | |
318 | newalt->next = NULL; | |
319 | newalt->base = strbuf_detach(&target, NULL); | |
320 | newalt->got_indices = 0; | |
321 | newalt->packs = NULL; | |
322 | ||
323 | while (tail->next != NULL) | |
324 | tail = tail->next; | |
325 | tail->next = newalt; | |
326 | } else { | |
327 | strbuf_release(&target); | |
328 | } | |
329 | } | |
330 | } | |
331 | i = posn + 1; | |
332 | } | |
333 | ||
334 | cdata->got_alternates = 1; | |
335 | } | |
336 | ||
337 | static void fetch_alternates(struct walker *walker, const char *base) | |
338 | { | |
339 | struct strbuf buffer = STRBUF_INIT; | |
340 | struct strbuf url = STRBUF_INIT; | |
341 | struct active_request_slot *slot; | |
342 | struct alternates_request alt_req; | |
343 | struct walker_data *cdata = walker->data; | |
344 | ||
345 | /* | |
346 | * If another request has already started fetching alternates, | |
347 | * wait for them to arrive and return to processing this request's | |
348 | * curl message | |
349 | */ | |
350 | #ifdef USE_CURL_MULTI | |
351 | while (cdata->got_alternates == 0) { | |
352 | step_active_slots(); | |
353 | } | |
354 | #endif | |
355 | ||
356 | /* Nothing to do if they've already been fetched */ | |
357 | if (cdata->got_alternates == 1) | |
358 | return; | |
359 | ||
360 | /* Start the fetch */ | |
361 | cdata->got_alternates = 0; | |
362 | ||
363 | if (walker->get_verbosely) | |
364 | fprintf(stderr, "Getting alternates list for %s\n", base); | |
365 | ||
366 | strbuf_addf(&url, "%s/objects/info/http-alternates", base); | |
367 | ||
368 | /* | |
369 | * Use a callback to process the result, since another request | |
370 | * may fail and need to have alternates loaded before continuing | |
371 | */ | |
372 | slot = get_active_slot(); | |
373 | slot->callback_func = process_alternates_response; | |
374 | alt_req.walker = walker; | |
375 | slot->callback_data = &alt_req; | |
376 | ||
377 | curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer); | |
378 | curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer); | |
379 | curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf); | |
380 | ||
381 | alt_req.base = base; | |
382 | alt_req.url = &url; | |
383 | alt_req.buffer = &buffer; | |
384 | alt_req.http_specific = 1; | |
385 | alt_req.slot = slot; | |
386 | ||
387 | if (start_active_slot(slot)) | |
388 | run_active_slot(slot); | |
389 | else | |
390 | cdata->got_alternates = -1; | |
391 | ||
392 | strbuf_release(&buffer); | |
393 | strbuf_release(&url); | |
394 | } | |
395 | ||
396 | static int fetch_indices(struct walker *walker, struct alt_base *repo) | |
397 | { | |
398 | int ret; | |
399 | ||
400 | if (repo->got_indices) | |
401 | return 0; | |
402 | ||
403 | if (walker->get_verbosely) | |
404 | fprintf(stderr, "Getting pack list for %s\n", repo->base); | |
405 | ||
406 | switch (http_get_info_packs(repo->base, &repo->packs)) { | |
407 | case HTTP_OK: | |
408 | case HTTP_MISSING_TARGET: | |
409 | repo->got_indices = 1; | |
410 | ret = 0; | |
411 | break; | |
412 | default: | |
413 | repo->got_indices = 0; | |
414 | ret = -1; | |
415 | } | |
416 | ||
417 | return ret; | |
418 | } | |
419 | ||
420 | static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1) | |
421 | { | |
422 | struct packed_git *target; | |
423 | int ret; | |
424 | struct slot_results results; | |
425 | struct http_pack_request *preq; | |
426 | ||
427 | if (fetch_indices(walker, repo)) | |
428 | return -1; | |
429 | target = find_sha1_pack(sha1, repo->packs); | |
430 | if (!target) | |
431 | return -1; | |
432 | ||
433 | if (walker->get_verbosely) { | |
434 | fprintf(stderr, "Getting pack %s\n", | |
435 | sha1_to_hex(target->sha1)); | |
436 | fprintf(stderr, " which contains %s\n", | |
437 | sha1_to_hex(sha1)); | |
438 | } | |
439 | ||
440 | preq = new_http_pack_request(target, repo->base); | |
441 | if (preq == NULL) | |
442 | goto abort; | |
443 | preq->lst = &repo->packs; | |
444 | preq->slot->results = &results; | |
445 | ||
446 | if (start_active_slot(preq->slot)) { | |
447 | run_active_slot(preq->slot); | |
448 | if (results.curl_result != CURLE_OK) { | |
449 | error("Unable to get pack file %s\n%s", preq->url, | |
450 | curl_errorstr); | |
451 | goto abort; | |
452 | } | |
453 | } else { | |
454 | error("Unable to start request"); | |
455 | goto abort; | |
456 | } | |
457 | ||
458 | ret = finish_http_pack_request(preq); | |
459 | release_http_pack_request(preq); | |
460 | if (ret) | |
461 | return ret; | |
462 | ||
463 | return 0; | |
464 | ||
465 | abort: | |
466 | return -1; | |
467 | } | |
468 | ||
469 | static void abort_object_request(struct object_request *obj_req) | |
470 | { | |
471 | release_object_request(obj_req); | |
472 | } | |
473 | ||
474 | static int fetch_object(struct walker *walker, unsigned char *sha1) | |
475 | { | |
476 | char *hex = sha1_to_hex(sha1); | |
477 | int ret = 0; | |
478 | struct object_request *obj_req = NULL; | |
479 | struct http_object_request *req; | |
480 | struct list_head *pos, *head = &object_queue_head; | |
481 | ||
482 | list_for_each(pos, head) { | |
483 | obj_req = list_entry(pos, struct object_request, node); | |
484 | if (!hashcmp(obj_req->sha1, sha1)) | |
485 | break; | |
486 | } | |
487 | if (obj_req == NULL) | |
488 | return error("Couldn't find request for %s in the queue", hex); | |
489 | ||
490 | if (has_sha1_file(obj_req->sha1)) { | |
491 | if (obj_req->req != NULL) | |
492 | abort_http_object_request(obj_req->req); | |
493 | abort_object_request(obj_req); | |
494 | return 0; | |
495 | } | |
496 | ||
497 | #ifdef USE_CURL_MULTI | |
498 | while (obj_req->state == WAITING) | |
499 | step_active_slots(); | |
500 | #else | |
501 | start_object_request(walker, obj_req); | |
502 | #endif | |
503 | ||
504 | /* | |
505 | * obj_req->req might change when fetching alternates in the callback | |
506 | * process_object_response; therefore, the "shortcut" variable, req, | |
507 | * is used only after we're done with slots. | |
508 | */ | |
509 | while (obj_req->state == ACTIVE) | |
510 | run_active_slot(obj_req->req->slot); | |
511 | ||
512 | req = obj_req->req; | |
513 | ||
514 | if (req->localfile != -1) { | |
515 | close(req->localfile); | |
516 | req->localfile = -1; | |
517 | } | |
518 | ||
519 | /* | |
520 | * we turned off CURLOPT_FAILONERROR to avoid losing a | |
521 | * persistent connection and got CURLE_OK. | |
522 | */ | |
523 | if (req->http_code >= 300 && req->curl_result == CURLE_OK && | |
524 | (starts_with(req->url, "http://") || | |
525 | starts_with(req->url, "https://"))) { | |
526 | req->curl_result = CURLE_HTTP_RETURNED_ERROR; | |
527 | xsnprintf(req->errorstr, sizeof(req->errorstr), | |
528 | "HTTP request failed"); | |
529 | } | |
530 | ||
531 | if (obj_req->state == ABORTED) { | |
532 | ret = error("Request for %s aborted", hex); | |
533 | } else if (req->curl_result != CURLE_OK && | |
534 | req->http_code != 416) { | |
535 | if (missing_target(req)) | |
536 | ret = -1; /* Be silent, it is probably in a pack. */ | |
537 | else | |
538 | ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)", | |
539 | req->errorstr, req->curl_result, | |
540 | req->http_code, hex); | |
541 | } else if (req->zret != Z_STREAM_END) { | |
542 | walker->corrupt_object_found++; | |
543 | ret = error("File %s (%s) corrupt", hex, req->url); | |
544 | } else if (hashcmp(obj_req->sha1, req->real_sha1)) { | |
545 | ret = error("File %s has bad hash", hex); | |
546 | } else if (req->rename < 0) { | |
547 | ret = error("unable to write sha1 filename %s", | |
548 | sha1_file_name(req->sha1)); | |
549 | } | |
550 | ||
551 | release_http_object_request(req); | |
552 | release_object_request(obj_req); | |
553 | return ret; | |
554 | } | |
555 | ||
556 | static int fetch(struct walker *walker, unsigned char *sha1) | |
557 | { | |
558 | struct walker_data *data = walker->data; | |
559 | struct alt_base *altbase = data->alt; | |
560 | ||
561 | if (!fetch_object(walker, sha1)) | |
562 | return 0; | |
563 | while (altbase) { | |
564 | if (!http_fetch_pack(walker, altbase, sha1)) | |
565 | return 0; | |
566 | fetch_alternates(walker, data->alt->base); | |
567 | altbase = altbase->next; | |
568 | } | |
569 | return error("Unable to find %s under %s", sha1_to_hex(sha1), | |
570 | data->alt->base); | |
571 | } | |
572 | ||
573 | static int fetch_ref(struct walker *walker, struct ref *ref) | |
574 | { | |
575 | struct walker_data *data = walker->data; | |
576 | return http_fetch_ref(data->alt->base, ref); | |
577 | } | |
578 | ||
579 | static void cleanup(struct walker *walker) | |
580 | { | |
581 | struct walker_data *data = walker->data; | |
582 | struct alt_base *alt, *alt_next; | |
583 | ||
584 | if (data) { | |
585 | alt = data->alt; | |
586 | while (alt) { | |
587 | alt_next = alt->next; | |
588 | ||
589 | free(alt->base); | |
590 | free(alt); | |
591 | ||
592 | alt = alt_next; | |
593 | } | |
594 | free(data); | |
595 | walker->data = NULL; | |
596 | } | |
597 | } | |
598 | ||
599 | struct walker *get_http_walker(const char *url) | |
600 | { | |
601 | char *s; | |
602 | struct walker_data *data = xmalloc(sizeof(struct walker_data)); | |
603 | struct walker *walker = xmalloc(sizeof(struct walker)); | |
604 | ||
605 | data->alt = xmalloc(sizeof(*data->alt)); | |
606 | data->alt->base = xstrdup(url); | |
607 | for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s) | |
608 | *s = 0; | |
609 | ||
610 | data->alt->got_indices = 0; | |
611 | data->alt->packs = NULL; | |
612 | data->alt->next = NULL; | |
613 | data->got_alternates = -1; | |
614 | ||
615 | walker->corrupt_object_found = 0; | |
616 | walker->fetch = fetch; | |
617 | walker->fetch_ref = fetch_ref; | |
618 | walker->prefetch = prefetch; | |
619 | walker->cleanup = cleanup; | |
620 | walker->data = data; | |
621 | ||
622 | #ifdef USE_CURL_MULTI | |
623 | add_fill_function(walker, (int (*)(void *)) fill_active_slot); | |
624 | #endif | |
625 | ||
626 | return walker; | |
627 | } |