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 if (http_follow_config != HTTP_FOLLOW_ALWAYS) {
172 warning("alternate disabled by http.followRedirects: %s", url);
176 for (i = 0; i < ARRAY_SIZE(protocols); i++) {
178 if (skip_prefix(url, protocols[i], &end) &&
179 starts_with(end, "://"))
183 if (i >= ARRAY_SIZE(protocols)) {
184 warning("ignoring alternate with unknown protocol: %s", url);
187 if (!is_transport_allowed(protocols[i], 0)) {
188 warning("ignoring alternate with restricted protocol: %s", url);
195 static void process_alternates_response(void *callback_data)
197 struct alternates_request *alt_req =
198 (struct alternates_request *)callback_data;
199 struct walker *walker = alt_req->walker;
200 struct walker_data *cdata = walker->data;
201 struct active_request_slot *slot = alt_req->slot;
202 struct alt_base *tail = cdata->alt;
203 const char *base = alt_req->base;
204 const char null_byte = '\0';
208 if (alt_req->http_specific) {
209 if (slot->curl_result != CURLE_OK ||
210 !alt_req->buffer->len) {
212 /* Try reusing the slot to get non-http alternates */
213 alt_req->http_specific = 0;
214 strbuf_reset(alt_req->url);
215 strbuf_addf(alt_req->url, "%s/objects/info/alternates",
217 curl_easy_setopt(slot->curl, CURLOPT_URL,
221 if (slot->finished != NULL)
222 (*slot->finished) = 0;
223 if (!start_active_slot(slot)) {
224 cdata->got_alternates = -1;
226 if (slot->finished != NULL)
227 (*slot->finished) = 1;
231 } else if (slot->curl_result != CURLE_OK) {
232 if (!missing_target(slot)) {
233 cdata->got_alternates = -1;
238 fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
239 alt_req->buffer->len--;
240 data = alt_req->buffer->buf;
242 while (i < alt_req->buffer->len) {
244 while (posn < alt_req->buffer->len && data[posn] != '\n')
246 if (data[posn] == '\n') {
249 struct alt_base *newalt;
250 if (data[i] == '/') {
253 * http://git.host/pub/scm/linux.git/
255 * so memcpy(dst, base, serverlen) will
256 * copy up to "...git.host".
258 const char *colon_ss = strstr(base,"://");
260 serverlen = (strchr(colon_ss + 3, '/')
264 } else if (!memcmp(data + i, "../", 3)) {
266 * Relative URL; chop the corresponding
267 * number of subpath from base (and ../
268 * from data), and concatenate the result.
270 * The code first drops ../ from data, and
271 * then drops one ../ from data and one path
272 * from base. IOW, one extra ../ is dropped
273 * from data than path is dropped from base.
275 * This is not wrong. The alternate in
276 * http://git.host/pub/scm/linux.git/
278 * http://git.host/pub/scm/linus.git/
279 * is ../../linus.git/objects/. You need
280 * two ../../ to borrow from your direct
284 serverlen = strlen(base);
285 while (i + 2 < posn &&
286 !memcmp(data + i, "../", 3)) {
289 } while (serverlen &&
290 base[serverlen - 1] != '/');
293 /* If the server got removed, give up. */
294 okay = strchr(base, ':') - base + 3 <
296 } else if (alt_req->http_specific) {
297 char *colon = strchr(data + i, ':');
298 char *slash = strchr(data + i, '/');
299 if (colon && slash && colon < data + posn &&
300 slash < data + posn && colon < slash) {
304 /* skip "objects\n" at end */
306 struct strbuf target = STRBUF_INIT;
307 strbuf_add(&target, base, serverlen);
308 strbuf_add(&target, data + i, posn - i - 7);
310 if (is_alternate_allowed(target.buf)) {
311 warning("adding alternate object store: %s",
313 newalt = xmalloc(sizeof(*newalt));
315 newalt->base = strbuf_detach(&target, NULL);
316 newalt->got_indices = 0;
317 newalt->packs = NULL;
319 while (tail->next != NULL)
328 cdata->got_alternates = 1;
331 static void fetch_alternates(struct walker *walker, const char *base)
333 struct strbuf buffer = STRBUF_INIT;
334 struct strbuf url = STRBUF_INIT;
335 struct active_request_slot *slot;
336 struct alternates_request alt_req;
337 struct walker_data *cdata = walker->data;
340 * If another request has already started fetching alternates,
341 * wait for them to arrive and return to processing this request's
344 #ifdef USE_CURL_MULTI
345 while (cdata->got_alternates == 0) {
350 /* Nothing to do if they've already been fetched */
351 if (cdata->got_alternates == 1)
354 /* Start the fetch */
355 cdata->got_alternates = 0;
357 if (walker->get_verbosely)
358 fprintf(stderr, "Getting alternates list for %s\n", base);
360 strbuf_addf(&url, "%s/objects/info/http-alternates", base);
363 * Use a callback to process the result, since another request
364 * may fail and need to have alternates loaded before continuing
366 slot = get_active_slot();
367 slot->callback_func = process_alternates_response;
368 alt_req.walker = walker;
369 slot->callback_data = &alt_req;
371 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
372 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
373 curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
377 alt_req.buffer = &buffer;
378 alt_req.http_specific = 1;
381 if (start_active_slot(slot))
382 run_active_slot(slot);
384 cdata->got_alternates = -1;
386 strbuf_release(&buffer);
387 strbuf_release(&url);
390 static int fetch_indices(struct walker *walker, struct alt_base *repo)
394 if (repo->got_indices)
397 if (walker->get_verbosely)
398 fprintf(stderr, "Getting pack list for %s\n", repo->base);
400 switch (http_get_info_packs(repo->base, &repo->packs)) {
402 case HTTP_MISSING_TARGET:
403 repo->got_indices = 1;
407 repo->got_indices = 0;
414 static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
416 struct packed_git *target;
418 struct slot_results results;
419 struct http_pack_request *preq;
421 if (fetch_indices(walker, repo))
423 target = find_sha1_pack(sha1, repo->packs);
427 if (walker->get_verbosely) {
428 fprintf(stderr, "Getting pack %s\n",
429 sha1_to_hex(target->sha1));
430 fprintf(stderr, " which contains %s\n",
434 preq = new_http_pack_request(target, repo->base);
437 preq->lst = &repo->packs;
438 preq->slot->results = &results;
440 if (start_active_slot(preq->slot)) {
441 run_active_slot(preq->slot);
442 if (results.curl_result != CURLE_OK) {
443 error("Unable to get pack file %s\n%s", preq->url,
448 error("Unable to start request");
452 ret = finish_http_pack_request(preq);
453 release_http_pack_request(preq);
463 static void abort_object_request(struct object_request *obj_req)
465 release_object_request(obj_req);
468 static int fetch_object(struct walker *walker, unsigned char *sha1)
470 char *hex = sha1_to_hex(sha1);
472 struct object_request *obj_req = NULL;
473 struct http_object_request *req;
474 struct list_head *pos, *head = &object_queue_head;
476 list_for_each(pos, head) {
477 obj_req = list_entry(pos, struct object_request, node);
478 if (!hashcmp(obj_req->sha1, sha1))
482 return error("Couldn't find request for %s in the queue", hex);
484 if (has_sha1_file(obj_req->sha1)) {
485 if (obj_req->req != NULL)
486 abort_http_object_request(obj_req->req);
487 abort_object_request(obj_req);
491 #ifdef USE_CURL_MULTI
492 while (obj_req->state == WAITING)
495 start_object_request(walker, obj_req);
499 * obj_req->req might change when fetching alternates in the callback
500 * process_object_response; therefore, the "shortcut" variable, req,
501 * is used only after we're done with slots.
503 while (obj_req->state == ACTIVE)
504 run_active_slot(obj_req->req->slot);
508 if (req->localfile != -1) {
509 close(req->localfile);
514 * we turned off CURLOPT_FAILONERROR to avoid losing a
515 * persistent connection and got CURLE_OK.
517 if (req->http_code >= 300 && req->curl_result == CURLE_OK &&
518 (starts_with(req->url, "http://") ||
519 starts_with(req->url, "https://"))) {
520 req->curl_result = CURLE_HTTP_RETURNED_ERROR;
521 xsnprintf(req->errorstr, sizeof(req->errorstr),
522 "HTTP request failed");
525 if (obj_req->state == ABORTED) {
526 ret = error("Request for %s aborted", hex);
527 } else if (req->curl_result != CURLE_OK &&
528 req->http_code != 416) {
529 if (missing_target(req))
530 ret = -1; /* Be silent, it is probably in a pack. */
532 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
533 req->errorstr, req->curl_result,
534 req->http_code, hex);
535 } else if (req->zret != Z_STREAM_END) {
536 walker->corrupt_object_found++;
537 ret = error("File %s (%s) corrupt", hex, req->url);
538 } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
539 ret = error("File %s has bad hash", hex);
540 } else if (req->rename < 0) {
541 ret = error("unable to write sha1 filename %s",
542 sha1_file_name(req->sha1));
545 release_http_object_request(req);
546 release_object_request(obj_req);
550 static int fetch(struct walker *walker, unsigned char *sha1)
552 struct walker_data *data = walker->data;
553 struct alt_base *altbase = data->alt;
555 if (!fetch_object(walker, sha1))
558 if (!http_fetch_pack(walker, altbase, sha1))
560 fetch_alternates(walker, data->alt->base);
561 altbase = altbase->next;
563 return error("Unable to find %s under %s", sha1_to_hex(sha1),
567 static int fetch_ref(struct walker *walker, struct ref *ref)
569 struct walker_data *data = walker->data;
570 return http_fetch_ref(data->alt->base, ref);
573 static void cleanup(struct walker *walker)
575 struct walker_data *data = walker->data;
576 struct alt_base *alt, *alt_next;
581 alt_next = alt->next;
593 struct walker *get_http_walker(const char *url)
596 struct walker_data *data = xmalloc(sizeof(struct walker_data));
597 struct walker *walker = xmalloc(sizeof(struct walker));
599 data->alt = xmalloc(sizeof(*data->alt));
600 data->alt->base = xstrdup(url);
601 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
604 data->alt->got_indices = 0;
605 data->alt->packs = NULL;
606 data->alt->next = NULL;
607 data->got_alternates = -1;
609 walker->corrupt_object_found = 0;
610 walker->fetch = fetch;
611 walker->fetch_ref = fetch_ref;
612 walker->prefetch = prefetch;
613 walker->cleanup = cleanup;
616 #ifdef USE_CURL_MULTI
617 add_fill_function(walker, (int (*)(void *)) fill_active_slot);