11 struct packed_git *packs;
12 struct alt_base *next;
15 enum object_request_state {
22 struct object_request {
23 struct walker *walker;
24 unsigned char sha1[20];
25 struct alt_base *repo;
26 enum object_request_state state;
27 struct http_object_request *req;
28 struct list_head node;
31 struct alternates_request {
32 struct walker *walker;
35 struct strbuf *buffer;
36 struct active_request_slot *slot;
46 static LIST_HEAD(object_queue_head);
48 static void fetch_alternates(struct walker *walker, const char *base);
50 static void process_object_response(void *callback_data);
52 static void start_object_request(struct walker *walker,
53 struct object_request *obj_req)
55 struct active_request_slot *slot;
56 struct http_object_request *req;
58 req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
60 obj_req->state = ABORTED;
66 slot->callback_func = process_object_response;
67 slot->callback_data = obj_req;
69 /* Try to get the request started, abort the request on error */
70 obj_req->state = ACTIVE;
71 if (!start_active_slot(slot)) {
72 obj_req->state = ABORTED;
73 release_http_object_request(req);
78 static void finish_object_request(struct object_request *obj_req)
80 if (finish_http_object_request(obj_req->req))
83 if (obj_req->req->rename == 0)
84 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
87 static void process_object_response(void *callback_data)
89 struct object_request *obj_req =
90 (struct object_request *)callback_data;
91 struct walker *walker = obj_req->walker;
92 struct walker_data *data = walker->data;
93 struct alt_base *alt = data->alt;
95 process_http_object_request(obj_req->req);
96 obj_req->state = COMPLETE;
98 /* Use alternates if necessary */
99 if (missing_target(obj_req->req)) {
100 fetch_alternates(walker, alt->base);
101 if (obj_req->repo->next != NULL) {
104 release_http_object_request(obj_req->req);
105 start_object_request(walker, obj_req);
110 finish_object_request(obj_req);
113 static void release_object_request(struct object_request *obj_req)
115 if (obj_req->req !=NULL && obj_req->req->localfile != -1)
116 error("fd leakage in release: %d", obj_req->req->localfile);
118 list_del(&obj_req->node);
122 #ifdef USE_CURL_MULTI
123 static int fill_active_slot(struct walker *walker)
125 struct object_request *obj_req;
126 struct list_head *pos, *tmp, *head = &object_queue_head;
128 list_for_each_safe(pos, tmp, head) {
129 obj_req = list_entry(pos, struct object_request, node);
130 if (obj_req->state == WAITING) {
131 if (has_sha1_file(obj_req->sha1))
132 obj_req->state = COMPLETE;
134 start_object_request(walker, obj_req);
143 static void prefetch(struct walker *walker, unsigned char *sha1)
145 struct object_request *newreq;
146 struct walker_data *data = walker->data;
148 newreq = xmalloc(sizeof(*newreq));
149 newreq->walker = walker;
150 hashcpy(newreq->sha1, sha1);
151 newreq->repo = data->alt;
152 newreq->state = WAITING;
155 http_is_verbose = walker->get_verbosely;
156 list_add_tail(&newreq->node, &object_queue_head);
158 #ifdef USE_CURL_MULTI
164 static int is_alternate_allowed(const char *url)
166 const char *protocols[] = {
167 "http", "https", "ftp", "ftps"
171 for (i = 0; i < ARRAY_SIZE(protocols); i++) {
173 if (skip_prefix(url, protocols[i], &end) &&
174 starts_with(end, "://"))
178 if (i >= ARRAY_SIZE(protocols)) {
179 warning("ignoring alternate with unknown protocol: %s", url);
182 if (!is_transport_allowed(protocols[i], 0)) {
183 warning("ignoring alternate with restricted protocol: %s", url);
190 static void process_alternates_response(void *callback_data)
192 struct alternates_request *alt_req =
193 (struct alternates_request *)callback_data;
194 struct walker *walker = alt_req->walker;
195 struct walker_data *cdata = walker->data;
196 struct active_request_slot *slot = alt_req->slot;
197 struct alt_base *tail = cdata->alt;
198 const char *base = alt_req->base;
199 const char null_byte = '\0';
203 if (alt_req->http_specific) {
204 if (slot->curl_result != CURLE_OK ||
205 !alt_req->buffer->len) {
207 /* Try reusing the slot to get non-http alternates */
208 alt_req->http_specific = 0;
209 strbuf_reset(alt_req->url);
210 strbuf_addf(alt_req->url, "%s/objects/info/alternates",
212 curl_easy_setopt(slot->curl, CURLOPT_URL,
216 if (slot->finished != NULL)
217 (*slot->finished) = 0;
218 if (!start_active_slot(slot)) {
219 cdata->got_alternates = -1;
221 if (slot->finished != NULL)
222 (*slot->finished) = 1;
226 } else if (slot->curl_result != CURLE_OK) {
227 if (!missing_target(slot)) {
228 cdata->got_alternates = -1;
233 fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
234 alt_req->buffer->len--;
235 data = alt_req->buffer->buf;
237 while (i < alt_req->buffer->len) {
239 while (posn < alt_req->buffer->len && data[posn] != '\n')
241 if (data[posn] == '\n') {
244 struct alt_base *newalt;
245 if (data[i] == '/') {
248 * http://git.host/pub/scm/linux.git/
250 * so memcpy(dst, base, serverlen) will
251 * copy up to "...git.host".
253 const char *colon_ss = strstr(base,"://");
255 serverlen = (strchr(colon_ss + 3, '/')
259 } else if (!memcmp(data + i, "../", 3)) {
261 * Relative URL; chop the corresponding
262 * number of subpath from base (and ../
263 * from data), and concatenate the result.
265 * The code first drops ../ from data, and
266 * then drops one ../ from data and one path
267 * from base. IOW, one extra ../ is dropped
268 * from data than path is dropped from base.
270 * This is not wrong. The alternate in
271 * http://git.host/pub/scm/linux.git/
273 * http://git.host/pub/scm/linus.git/
274 * is ../../linus.git/objects/. You need
275 * two ../../ to borrow from your direct
279 serverlen = strlen(base);
280 while (i + 2 < posn &&
281 !memcmp(data + i, "../", 3)) {
284 } while (serverlen &&
285 base[serverlen - 1] != '/');
288 /* If the server got removed, give up. */
289 okay = strchr(base, ':') - base + 3 <
291 } else if (alt_req->http_specific) {
292 char *colon = strchr(data + i, ':');
293 char *slash = strchr(data + i, '/');
294 if (colon && slash && colon < data + posn &&
295 slash < data + posn && colon < slash) {
299 /* skip "objects\n" at end */
301 struct strbuf target = STRBUF_INIT;
302 strbuf_add(&target, base, serverlen);
303 strbuf_add(&target, data + i, posn - i - 7);
305 if (is_alternate_allowed(target.buf)) {
306 warning("adding alternate object store: %s",
308 newalt = xmalloc(sizeof(*newalt));
310 newalt->base = strbuf_detach(&target, NULL);
311 newalt->got_indices = 0;
312 newalt->packs = NULL;
314 while (tail->next != NULL)
323 cdata->got_alternates = 1;
326 static void fetch_alternates(struct walker *walker, const char *base)
328 struct strbuf buffer = STRBUF_INIT;
329 struct strbuf url = STRBUF_INIT;
330 struct active_request_slot *slot;
331 struct alternates_request alt_req;
332 struct walker_data *cdata = walker->data;
334 if (http_follow_config != HTTP_FOLLOW_ALWAYS)
338 * If another request has already started fetching alternates,
339 * wait for them to arrive and return to processing this request's
342 #ifdef USE_CURL_MULTI
343 while (cdata->got_alternates == 0) {
348 /* Nothing to do if they've already been fetched */
349 if (cdata->got_alternates == 1)
352 /* Start the fetch */
353 cdata->got_alternates = 0;
355 if (walker->get_verbosely)
356 fprintf(stderr, "Getting alternates list for %s\n", base);
358 strbuf_addf(&url, "%s/objects/info/http-alternates", base);
361 * Use a callback to process the result, since another request
362 * may fail and need to have alternates loaded before continuing
364 slot = get_active_slot();
365 slot->callback_func = process_alternates_response;
366 alt_req.walker = walker;
367 slot->callback_data = &alt_req;
369 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
370 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
371 curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
375 alt_req.buffer = &buffer;
376 alt_req.http_specific = 1;
379 if (start_active_slot(slot))
380 run_active_slot(slot);
382 cdata->got_alternates = -1;
384 strbuf_release(&buffer);
385 strbuf_release(&url);
388 static int fetch_indices(struct walker *walker, struct alt_base *repo)
392 if (repo->got_indices)
395 if (walker->get_verbosely)
396 fprintf(stderr, "Getting pack list for %s\n", repo->base);
398 switch (http_get_info_packs(repo->base, &repo->packs)) {
400 case HTTP_MISSING_TARGET:
401 repo->got_indices = 1;
405 repo->got_indices = 0;
412 static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
414 struct packed_git *target;
416 struct slot_results results;
417 struct http_pack_request *preq;
419 if (fetch_indices(walker, repo))
421 target = find_sha1_pack(sha1, repo->packs);
425 if (walker->get_verbosely) {
426 fprintf(stderr, "Getting pack %s\n",
427 sha1_to_hex(target->sha1));
428 fprintf(stderr, " which contains %s\n",
432 preq = new_http_pack_request(target, repo->base);
435 preq->lst = &repo->packs;
436 preq->slot->results = &results;
438 if (start_active_slot(preq->slot)) {
439 run_active_slot(preq->slot);
440 if (results.curl_result != CURLE_OK) {
441 error("Unable to get pack file %s\n%s", preq->url,
446 error("Unable to start request");
450 ret = finish_http_pack_request(preq);
451 release_http_pack_request(preq);
461 static void abort_object_request(struct object_request *obj_req)
463 release_object_request(obj_req);
466 static int fetch_object(struct walker *walker, unsigned char *sha1)
468 char *hex = sha1_to_hex(sha1);
470 struct object_request *obj_req = NULL;
471 struct http_object_request *req;
472 struct list_head *pos, *head = &object_queue_head;
474 list_for_each(pos, head) {
475 obj_req = list_entry(pos, struct object_request, node);
476 if (!hashcmp(obj_req->sha1, sha1))
480 return error("Couldn't find request for %s in the queue", hex);
482 if (has_sha1_file(obj_req->sha1)) {
483 if (obj_req->req != NULL)
484 abort_http_object_request(obj_req->req);
485 abort_object_request(obj_req);
489 #ifdef USE_CURL_MULTI
490 while (obj_req->state == WAITING)
493 start_object_request(walker, obj_req);
497 * obj_req->req might change when fetching alternates in the callback
498 * process_object_response; therefore, the "shortcut" variable, req,
499 * is used only after we're done with slots.
501 while (obj_req->state == ACTIVE)
502 run_active_slot(obj_req->req->slot);
506 if (req->localfile != -1) {
507 close(req->localfile);
512 * we turned off CURLOPT_FAILONERROR to avoid losing a
513 * persistent connection and got CURLE_OK.
515 if (req->http_code >= 300 && req->curl_result == CURLE_OK &&
516 (starts_with(req->url, "http://") ||
517 starts_with(req->url, "https://"))) {
518 req->curl_result = CURLE_HTTP_RETURNED_ERROR;
519 xsnprintf(req->errorstr, sizeof(req->errorstr),
520 "HTTP request failed");
523 if (obj_req->state == ABORTED) {
524 ret = error("Request for %s aborted", hex);
525 } else if (req->curl_result != CURLE_OK &&
526 req->http_code != 416) {
527 if (missing_target(req))
528 ret = -1; /* Be silent, it is probably in a pack. */
530 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
531 req->errorstr, req->curl_result,
532 req->http_code, hex);
533 } else if (req->zret != Z_STREAM_END) {
534 walker->corrupt_object_found++;
535 ret = error("File %s (%s) corrupt", hex, req->url);
536 } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
537 ret = error("File %s has bad hash", hex);
538 } else if (req->rename < 0) {
539 ret = error("unable to write sha1 filename %s",
540 sha1_file_name(req->sha1));
543 release_http_object_request(req);
544 release_object_request(obj_req);
548 static int fetch(struct walker *walker, unsigned char *sha1)
550 struct walker_data *data = walker->data;
551 struct alt_base *altbase = data->alt;
553 if (!fetch_object(walker, sha1))
556 if (!http_fetch_pack(walker, altbase, sha1))
558 fetch_alternates(walker, data->alt->base);
559 altbase = altbase->next;
561 return error("Unable to find %s under %s", sha1_to_hex(sha1),
565 static int fetch_ref(struct walker *walker, struct ref *ref)
567 struct walker_data *data = walker->data;
568 return http_fetch_ref(data->alt->base, ref);
571 static void cleanup(struct walker *walker)
573 struct walker_data *data = walker->data;
574 struct alt_base *alt, *alt_next;
579 alt_next = alt->next;
591 struct walker *get_http_walker(const char *url)
594 struct walker_data *data = xmalloc(sizeof(struct walker_data));
595 struct walker *walker = xmalloc(sizeof(struct walker));
597 data->alt = xmalloc(sizeof(*data->alt));
598 data->alt->base = xstrdup(url);
599 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
602 data->alt->got_indices = 0;
603 data->alt->packs = NULL;
604 data->alt->next = NULL;
605 data->got_alternates = -1;
607 walker->corrupt_object_found = 0;
608 walker->fetch = fetch;
609 walker->fetch_ref = fetch_ref;
610 walker->prefetch = prefetch;
611 walker->cleanup = cleanup;
614 #ifdef USE_CURL_MULTI
615 add_fill_function(walker, (int (*)(void *)) fill_active_slot);