9 struct packed_git *packs;
10 struct alt_base *next;
13 enum object_request_state {
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;
29 struct alternates_request {
30 struct walker *walker;
33 struct strbuf *buffer;
34 struct active_request_slot *slot;
44 static struct object_request *object_queue_head;
46 static void fetch_alternates(struct walker *walker, const char *base);
48 static void process_object_response(void *callback_data);
50 static void start_object_request(struct walker *walker,
51 struct object_request *obj_req)
53 struct active_request_slot *slot;
54 struct http_object_request *req;
56 req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
58 obj_req->state = ABORTED;
64 slot->callback_func = process_object_response;
65 slot->callback_data = obj_req;
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);
76 static void finish_object_request(struct object_request *obj_req)
78 if (finish_http_object_request(obj_req->req))
81 if (obj_req->req->rename == 0)
82 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
85 static void process_object_response(void *callback_data)
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;
93 process_http_object_request(obj_req->req);
94 obj_req->state = COMPLETE;
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) {
102 release_http_object_request(obj_req->req);
103 start_object_request(walker, obj_req);
108 finish_object_request(obj_req);
111 static void release_object_request(struct object_request *obj_req)
113 struct object_request *entry = object_queue_head;
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;
120 while (entry->next != NULL && entry->next != obj_req)
122 if (entry->next == obj_req)
123 entry->next = entry->next->next;
129 #ifdef USE_CURL_MULTI
130 static int fill_active_slot(struct walker *walker)
132 struct object_request *obj_req;
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;
139 start_object_request(walker, obj_req);
148 static void prefetch(struct walker *walker, unsigned char *sha1)
150 struct object_request *newreq;
151 struct object_request *tail;
152 struct walker_data *data = walker->data;
154 newreq = xmalloc(sizeof(*newreq));
155 newreq->walker = walker;
156 hashcpy(newreq->sha1, sha1);
157 newreq->repo = data->alt;
158 newreq->state = WAITING;
162 http_is_verbose = walker->get_verbosely;
164 if (object_queue_head == NULL) {
165 object_queue_head = newreq;
167 tail = object_queue_head;
168 while (tail->next != NULL)
173 #ifdef USE_CURL_MULTI
179 static void process_alternates_response(void *callback_data)
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';
192 if (alt_req->http_specific) {
193 if (slot->curl_result != CURLE_OK ||
194 !alt_req->buffer->len) {
196 /* Try reusing the slot to get non-http alternates */
197 alt_req->http_specific = 0;
198 strbuf_reset(alt_req->url);
199 strbuf_addf(alt_req->url, "%s/objects/info/alternates",
201 curl_easy_setopt(slot->curl, CURLOPT_URL,
205 if (slot->finished != NULL)
206 (*slot->finished) = 0;
207 if (!start_active_slot(slot)) {
208 cdata->got_alternates = -1;
210 if (slot->finished != NULL)
211 (*slot->finished) = 1;
215 } else if (slot->curl_result != CURLE_OK) {
216 if (!missing_target(slot)) {
217 cdata->got_alternates = -1;
222 fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
223 alt_req->buffer->len--;
224 data = alt_req->buffer->buf;
226 while (i < alt_req->buffer->len) {
228 while (posn < alt_req->buffer->len && data[posn] != '\n')
230 if (data[posn] == '\n') {
233 struct alt_base *newalt;
234 if (data[i] == '/') {
237 * http://git.host/pub/scm/linux.git/
239 * so memcpy(dst, base, serverlen) will
240 * copy up to "...git.host".
242 const char *colon_ss = strstr(base,"://");
244 serverlen = (strchr(colon_ss + 3, '/')
248 } else if (!memcmp(data + i, "../", 3)) {
250 * Relative URL; chop the corresponding
251 * number of subpath from base (and ../
252 * from data), and concatenate the result.
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.
259 * This is not wrong. The alternate in
260 * http://git.host/pub/scm/linux.git/
262 * http://git.host/pub/scm/linus.git/
263 * is ../../linus.git/objects/. You need
264 * two ../../ to borrow from your direct
268 serverlen = strlen(base);
269 while (i + 2 < posn &&
270 !memcmp(data + i, "../", 3)) {
273 } while (serverlen &&
274 base[serverlen - 1] != '/');
277 /* If the server got removed, give up. */
278 okay = strchr(base, ':') - base + 3 <
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) {
288 /* skip "objects\n" at end */
290 struct strbuf target = STRBUF_INIT;
291 strbuf_add(&target, base, serverlen);
292 strbuf_add(&target, data + i, posn - i - 7);
293 if (walker->get_verbosely)
294 fprintf(stderr, "Also look at %s\n",
296 newalt = xmalloc(sizeof(*newalt));
298 newalt->base = strbuf_detach(&target, NULL);
299 newalt->got_indices = 0;
300 newalt->packs = NULL;
302 while (tail->next != NULL)
310 cdata->got_alternates = 1;
313 static void fetch_alternates(struct walker *walker, const char *base)
315 struct strbuf buffer = STRBUF_INIT;
316 struct strbuf url = STRBUF_INIT;
317 struct active_request_slot *slot;
318 struct alternates_request alt_req;
319 struct walker_data *cdata = walker->data;
322 * If another request has already started fetching alternates,
323 * wait for them to arrive and return to processing this request's
326 #ifdef USE_CURL_MULTI
327 while (cdata->got_alternates == 0) {
332 /* Nothing to do if they've already been fetched */
333 if (cdata->got_alternates == 1)
336 /* Start the fetch */
337 cdata->got_alternates = 0;
339 if (walker->get_verbosely)
340 fprintf(stderr, "Getting alternates list for %s\n", base);
342 strbuf_addf(&url, "%s/objects/info/http-alternates", base);
345 * Use a callback to process the result, since another request
346 * may fail and need to have alternates loaded before continuing
348 slot = get_active_slot();
349 slot->callback_func = process_alternates_response;
350 alt_req.walker = walker;
351 slot->callback_data = &alt_req;
353 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
354 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
355 curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
359 alt_req.buffer = &buffer;
360 alt_req.http_specific = 1;
363 if (start_active_slot(slot))
364 run_active_slot(slot);
366 cdata->got_alternates = -1;
368 strbuf_release(&buffer);
369 strbuf_release(&url);
372 static int fetch_indices(struct walker *walker, struct alt_base *repo)
376 if (repo->got_indices)
379 if (walker->get_verbosely)
380 fprintf(stderr, "Getting pack list for %s\n", repo->base);
382 switch (http_get_info_packs(repo->base, &repo->packs)) {
384 case HTTP_MISSING_TARGET:
385 repo->got_indices = 1;
389 repo->got_indices = 0;
396 static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
398 struct packed_git *target;
400 struct slot_results results;
401 struct http_pack_request *preq;
403 if (fetch_indices(walker, repo))
405 target = find_sha1_pack(sha1, repo->packs);
409 if (walker->get_verbosely) {
410 fprintf(stderr, "Getting pack %s\n",
411 sha1_to_hex(target->sha1));
412 fprintf(stderr, " which contains %s\n",
416 preq = new_http_pack_request(target, repo->base);
419 preq->lst = &repo->packs;
420 preq->slot->results = &results;
422 if (start_active_slot(preq->slot)) {
423 run_active_slot(preq->slot);
424 if (results.curl_result != CURLE_OK) {
425 error("Unable to get pack file %s\n%s", preq->url,
430 error("Unable to start request");
434 ret = finish_http_pack_request(preq);
435 release_http_pack_request(preq);
445 static void abort_object_request(struct object_request *obj_req)
447 release_object_request(obj_req);
450 static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
452 char *hex = sha1_to_hex(sha1);
454 struct object_request *obj_req = object_queue_head;
455 struct http_object_request *req;
457 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
458 obj_req = obj_req->next;
460 return error("Couldn't find request for %s in the queue", hex);
462 if (has_sha1_file(obj_req->sha1)) {
463 if (obj_req->req != NULL)
464 abort_http_object_request(obj_req->req);
465 abort_object_request(obj_req);
469 #ifdef USE_CURL_MULTI
470 while (obj_req->state == WAITING)
473 start_object_request(walker, obj_req);
477 * obj_req->req might change when fetching alternates in the callback
478 * process_object_response; therefore, the "shortcut" variable, req,
479 * is used only after we're done with slots.
481 while (obj_req->state == ACTIVE)
482 run_active_slot(obj_req->req->slot);
486 if (req->localfile != -1) {
487 close(req->localfile);
491 if (obj_req->state == ABORTED) {
492 ret = error("Request for %s aborted", hex);
493 } else if (req->curl_result != CURLE_OK &&
494 req->http_code != 416) {
495 if (missing_target(req))
496 ret = -1; /* Be silent, it is probably in a pack. */
498 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
499 req->errorstr, req->curl_result,
500 req->http_code, hex);
501 } else if (req->zret != Z_STREAM_END) {
502 walker->corrupt_object_found++;
503 ret = error("File %s (%s) corrupt", hex, req->url);
504 } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
505 ret = error("File %s has bad hash", hex);
506 } else if (req->rename < 0) {
507 ret = error("unable to write sha1 filename %s",
508 sha1_file_name(req->sha1));
511 release_http_object_request(req);
512 release_object_request(obj_req);
516 static int fetch(struct walker *walker, unsigned char *sha1)
518 struct walker_data *data = walker->data;
519 struct alt_base *altbase = data->alt;
521 if (!fetch_object(walker, altbase, sha1))
524 if (!http_fetch_pack(walker, altbase, sha1))
526 fetch_alternates(walker, data->alt->base);
527 altbase = altbase->next;
529 return error("Unable to find %s under %s", sha1_to_hex(sha1),
533 static int fetch_ref(struct walker *walker, struct ref *ref)
535 struct walker_data *data = walker->data;
536 return http_fetch_ref(data->alt->base, ref);
539 static void cleanup(struct walker *walker)
541 struct walker_data *data = walker->data;
542 struct alt_base *alt, *alt_next;
547 alt_next = alt->next;
559 struct walker *get_http_walker(const char *url)
562 struct walker_data *data = xmalloc(sizeof(struct walker_data));
563 struct walker *walker = xmalloc(sizeof(struct walker));
565 data->alt = xmalloc(sizeof(*data->alt));
566 data->alt->base = xstrdup(url);
567 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
570 data->alt->got_indices = 0;
571 data->alt->packs = NULL;
572 data->alt->next = NULL;
573 data->got_alternates = -1;
575 walker->corrupt_object_found = 0;
576 walker->fetch = fetch;
577 walker->fetch_ref = fetch_ref;
578 walker->prefetch = prefetch;
579 walker->cleanup = cleanup;
582 #ifdef USE_CURL_MULTI
583 add_fill_function(walker, (int (*)(void *)) fill_active_slot);