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) {
300 struct strbuf target = STRBUF_INIT;
301 strbuf_add(&target, base, serverlen);
302 strbuf_add(&target, data + i, posn - i);
303 if (!strbuf_strip_suffix(&target, "objects")) {
304 warning("ignoring alternate that does"
305 " not end in 'objects': %s",
307 strbuf_release(&target);
308 } else if (is_alternate_allowed(target.buf)) {
309 warning("adding alternate object store: %s",
311 newalt = xmalloc(sizeof(*newalt));
313 newalt->base = strbuf_detach(&target, NULL);
314 newalt->got_indices = 0;
315 newalt->packs = NULL;
317 while (tail->next != NULL)
326 cdata->got_alternates = 1;
329 static void fetch_alternates(struct walker *walker, const char *base)
331 struct strbuf buffer = STRBUF_INIT;
332 struct strbuf url = STRBUF_INIT;
333 struct active_request_slot *slot;
334 struct alternates_request alt_req;
335 struct walker_data *cdata = walker->data;
337 if (http_follow_config != HTTP_FOLLOW_ALWAYS)
341 * If another request has already started fetching alternates,
342 * wait for them to arrive and return to processing this request's
345 #ifdef USE_CURL_MULTI
346 while (cdata->got_alternates == 0) {
351 /* Nothing to do if they've already been fetched */
352 if (cdata->got_alternates == 1)
355 /* Start the fetch */
356 cdata->got_alternates = 0;
358 if (walker->get_verbosely)
359 fprintf(stderr, "Getting alternates list for %s\n", base);
361 strbuf_addf(&url, "%s/objects/info/http-alternates", base);
364 * Use a callback to process the result, since another request
365 * may fail and need to have alternates loaded before continuing
367 slot = get_active_slot();
368 slot->callback_func = process_alternates_response;
369 alt_req.walker = walker;
370 slot->callback_data = &alt_req;
372 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
373 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
374 curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
378 alt_req.buffer = &buffer;
379 alt_req.http_specific = 1;
382 if (start_active_slot(slot))
383 run_active_slot(slot);
385 cdata->got_alternates = -1;
387 strbuf_release(&buffer);
388 strbuf_release(&url);
391 static int fetch_indices(struct walker *walker, struct alt_base *repo)
395 if (repo->got_indices)
398 if (walker->get_verbosely)
399 fprintf(stderr, "Getting pack list for %s\n", repo->base);
401 switch (http_get_info_packs(repo->base, &repo->packs)) {
403 case HTTP_MISSING_TARGET:
404 repo->got_indices = 1;
408 repo->got_indices = 0;
415 static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
417 struct packed_git *target;
419 struct slot_results results;
420 struct http_pack_request *preq;
422 if (fetch_indices(walker, repo))
424 target = find_sha1_pack(sha1, repo->packs);
428 if (walker->get_verbosely) {
429 fprintf(stderr, "Getting pack %s\n",
430 sha1_to_hex(target->sha1));
431 fprintf(stderr, " which contains %s\n",
435 preq = new_http_pack_request(target, repo->base);
438 preq->lst = &repo->packs;
439 preq->slot->results = &results;
441 if (start_active_slot(preq->slot)) {
442 run_active_slot(preq->slot);
443 if (results.curl_result != CURLE_OK) {
444 error("Unable to get pack file %s\n%s", preq->url,
449 error("Unable to start request");
453 ret = finish_http_pack_request(preq);
454 release_http_pack_request(preq);
464 static void abort_object_request(struct object_request *obj_req)
466 release_object_request(obj_req);
469 static int fetch_object(struct walker *walker, unsigned char *sha1)
471 char *hex = sha1_to_hex(sha1);
473 struct object_request *obj_req = NULL;
474 struct http_object_request *req;
475 struct list_head *pos, *head = &object_queue_head;
477 list_for_each(pos, head) {
478 obj_req = list_entry(pos, struct object_request, node);
479 if (!hashcmp(obj_req->sha1, sha1))
483 return error("Couldn't find request for %s in the queue", hex);
485 if (has_sha1_file(obj_req->sha1)) {
486 if (obj_req->req != NULL)
487 abort_http_object_request(obj_req->req);
488 abort_object_request(obj_req);
492 #ifdef USE_CURL_MULTI
493 while (obj_req->state == WAITING)
496 start_object_request(walker, obj_req);
500 * obj_req->req might change when fetching alternates in the callback
501 * process_object_response; therefore, the "shortcut" variable, req,
502 * is used only after we're done with slots.
504 while (obj_req->state == ACTIVE)
505 run_active_slot(obj_req->req->slot);
509 if (req->localfile != -1) {
510 close(req->localfile);
515 * we turned off CURLOPT_FAILONERROR to avoid losing a
516 * persistent connection and got CURLE_OK.
518 if (req->http_code >= 300 && req->curl_result == CURLE_OK &&
519 (starts_with(req->url, "http://") ||
520 starts_with(req->url, "https://"))) {
521 req->curl_result = CURLE_HTTP_RETURNED_ERROR;
522 xsnprintf(req->errorstr, sizeof(req->errorstr),
523 "HTTP request failed");
526 if (obj_req->state == ABORTED) {
527 ret = error("Request for %s aborted", hex);
528 } else if (req->curl_result != CURLE_OK &&
529 req->http_code != 416) {
530 if (missing_target(req))
531 ret = -1; /* Be silent, it is probably in a pack. */
533 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
534 req->errorstr, req->curl_result,
535 req->http_code, hex);
536 } else if (req->zret != Z_STREAM_END) {
537 walker->corrupt_object_found++;
538 ret = error("File %s (%s) corrupt", hex, req->url);
539 } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
540 ret = error("File %s has bad hash", hex);
541 } else if (req->rename < 0) {
542 ret = error("unable to write sha1 filename %s",
543 sha1_file_name(req->sha1));
546 release_http_object_request(req);
547 release_object_request(obj_req);
551 static int fetch(struct walker *walker, unsigned char *sha1)
553 struct walker_data *data = walker->data;
554 struct alt_base *altbase = data->alt;
556 if (!fetch_object(walker, sha1))
559 if (!http_fetch_pack(walker, altbase, sha1))
561 fetch_alternates(walker, data->alt->base);
562 altbase = altbase->next;
564 return error("Unable to find %s under %s", sha1_to_hex(sha1),
568 static int fetch_ref(struct walker *walker, struct ref *ref)
570 struct walker_data *data = walker->data;
571 return http_fetch_ref(data->alt->base, ref);
574 static void cleanup(struct walker *walker)
576 struct walker_data *data = walker->data;
577 struct alt_base *alt, *alt_next;
582 alt_next = alt->next;
594 struct walker *get_http_walker(const char *url)
597 struct walker_data *data = xmalloc(sizeof(struct walker_data));
598 struct walker *walker = xmalloc(sizeof(struct walker));
600 data->alt = xmalloc(sizeof(*data->alt));
601 data->alt->base = xstrdup(url);
602 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
605 data->alt->got_indices = 0;
606 data->alt->packs = NULL;
607 data->alt->next = NULL;
608 data->got_alternates = -1;
610 walker->corrupt_object_found = 0;
611 walker->fetch = fetch;
612 walker->fetch_ref = fetch_ref;
613 walker->prefetch = prefetch;
614 walker->cleanup = cleanup;
617 #ifdef USE_CURL_MULTI
618 add_fill_function(walker, (int (*)(void *)) fill_active_slot);