added index caching
[git/mingw/4msysgit/wingit-dll.git] / http-walker.c
blob7321ccc9fe751a1e608c6620bcce401eac7ff98c
1 #include "cache.h"
2 #include "commit.h"
3 #include "pack.h"
4 #include "walker.h"
5 #include "http.h"
7 #define PREV_BUF_SIZE 4096
8 #define RANGE_HEADER_SIZE 30
10 struct alt_base
12 char *base;
13 int got_indices;
14 struct packed_git *packs;
15 struct alt_base *next;
18 enum object_request_state {
19 WAITING,
20 ABORTED,
21 ACTIVE,
22 COMPLETE,
25 struct object_request
27 struct walker *walker;
28 unsigned char sha1[20];
29 struct alt_base *repo;
30 char *url;
31 char filename[PATH_MAX];
32 char tmpfile[PATH_MAX];
33 int local;
34 enum object_request_state state;
35 CURLcode curl_result;
36 char errorstr[CURL_ERROR_SIZE];
37 long http_code;
38 unsigned char real_sha1[20];
39 git_SHA_CTX c;
40 z_stream stream;
41 int zret;
42 int rename;
43 struct active_request_slot *slot;
44 struct object_request *next;
47 struct alternates_request {
48 struct walker *walker;
49 const char *base;
50 char *url;
51 struct strbuf *buffer;
52 struct active_request_slot *slot;
53 int http_specific;
56 struct walker_data {
57 const char *url;
58 int got_alternates;
59 struct alt_base *alt;
60 struct curl_slist *no_pragma_header;
63 static struct object_request *object_queue_head;
65 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
66 void *data)
68 unsigned char expn[4096];
69 size_t size = eltsize * nmemb;
70 int posn = 0;
71 struct object_request *obj_req = (struct object_request *)data;
72 do {
73 ssize_t retval = xwrite(obj_req->local,
74 (char *) ptr + posn, size - posn);
75 if (retval < 0)
76 return posn;
77 posn += retval;
78 } while (posn < size);
80 obj_req->stream.avail_in = size;
81 obj_req->stream.next_in = ptr;
82 do {
83 obj_req->stream.next_out = expn;
84 obj_req->stream.avail_out = sizeof(expn);
85 obj_req->zret = git_inflate(&obj_req->stream, Z_SYNC_FLUSH);
86 git_SHA1_Update(&obj_req->c, expn,
87 sizeof(expn) - obj_req->stream.avail_out);
88 } while (obj_req->stream.avail_in && obj_req->zret == Z_OK);
89 data_received++;
90 return size;
93 static void fetch_alternates(struct walker *walker, const char *base);
95 static void process_object_response(void *callback_data);
97 static void start_object_request(struct walker *walker,
98 struct object_request *obj_req)
100 char *hex = sha1_to_hex(obj_req->sha1);
101 char prevfile[PATH_MAX];
102 char *url;
103 char *posn;
104 int prevlocal;
105 unsigned char prev_buf[PREV_BUF_SIZE];
106 ssize_t prev_read = 0;
107 long prev_posn = 0;
108 char range[RANGE_HEADER_SIZE];
109 struct curl_slist *range_header = NULL;
110 struct active_request_slot *slot;
111 struct walker_data *data = walker->data;
113 snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
114 unlink_or_warn(prevfile);
115 rename(obj_req->tmpfile, prevfile);
116 unlink_or_warn(obj_req->tmpfile);
118 if (obj_req->local != -1)
119 error("fd leakage in start: %d", obj_req->local);
120 obj_req->local = open(obj_req->tmpfile,
121 O_WRONLY | O_CREAT | O_EXCL, 0666);
122 /* This could have failed due to the "lazy directory creation";
123 * try to mkdir the last path component.
125 if (obj_req->local < 0 && errno == ENOENT) {
126 char *dir = strrchr(obj_req->tmpfile, '/');
127 if (dir) {
128 *dir = 0;
129 mkdir(obj_req->tmpfile, 0777);
130 *dir = '/';
132 obj_req->local = open(obj_req->tmpfile,
133 O_WRONLY | O_CREAT | O_EXCL, 0666);
136 if (obj_req->local < 0) {
137 obj_req->state = ABORTED;
138 error("Couldn't create temporary file %s for %s: %s",
139 obj_req->tmpfile, obj_req->filename, strerror(errno));
140 return;
143 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
145 git_inflate_init(&obj_req->stream);
147 git_SHA1_Init(&obj_req->c);
149 url = xmalloc(strlen(obj_req->repo->base) + 51);
150 obj_req->url = xmalloc(strlen(obj_req->repo->base) + 51);
151 strcpy(url, obj_req->repo->base);
152 posn = url + strlen(obj_req->repo->base);
153 strcpy(posn, "/objects/");
154 posn += 9;
155 memcpy(posn, hex, 2);
156 posn += 2;
157 *(posn++) = '/';
158 strcpy(posn, hex + 2);
159 strcpy(obj_req->url, url);
161 /* If a previous temp file is present, process what was already
162 fetched. */
163 prevlocal = open(prevfile, O_RDONLY);
164 if (prevlocal != -1) {
165 do {
166 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
167 if (prev_read>0) {
168 if (fwrite_sha1_file(prev_buf,
170 prev_read,
171 obj_req) == prev_read) {
172 prev_posn += prev_read;
173 } else {
174 prev_read = -1;
177 } while (prev_read > 0);
178 close(prevlocal);
180 unlink_or_warn(prevfile);
182 /* Reset inflate/SHA1 if there was an error reading the previous temp
183 file; also rewind to the beginning of the local file. */
184 if (prev_read == -1) {
185 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
186 git_inflate_init(&obj_req->stream);
187 git_SHA1_Init(&obj_req->c);
188 if (prev_posn>0) {
189 prev_posn = 0;
190 lseek(obj_req->local, 0, SEEK_SET);
191 ftruncate(obj_req->local, 0);
195 slot = get_active_slot();
196 slot->callback_func = process_object_response;
197 slot->callback_data = obj_req;
198 obj_req->slot = slot;
200 curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req);
201 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
202 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr);
203 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
204 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
206 /* If we have successfully processed data from a previous fetch
207 attempt, only fetch the data we don't already have. */
208 if (prev_posn>0) {
209 if (walker->get_verbosely)
210 fprintf(stderr,
211 "Resuming fetch of object %s at byte %ld\n",
212 hex, prev_posn);
213 sprintf(range, "Range: bytes=%ld-", prev_posn);
214 range_header = curl_slist_append(range_header, range);
215 curl_easy_setopt(slot->curl,
216 CURLOPT_HTTPHEADER, range_header);
219 /* Try to get the request started, abort the request on error */
220 obj_req->state = ACTIVE;
221 if (!start_active_slot(slot)) {
222 obj_req->state = ABORTED;
223 obj_req->slot = NULL;
224 close(obj_req->local); obj_req->local = -1;
225 free(obj_req->url);
226 return;
230 static void finish_object_request(struct object_request *obj_req)
232 struct stat st;
234 close(obj_req->local); obj_req->local = -1;
236 if (obj_req->http_code == 416) {
237 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
238 } else if (obj_req->curl_result != CURLE_OK) {
239 if (stat(obj_req->tmpfile, &st) == 0)
240 if (st.st_size == 0)
241 unlink_or_warn(obj_req->tmpfile);
242 return;
245 git_inflate_end(&obj_req->stream);
246 git_SHA1_Final(obj_req->real_sha1, &obj_req->c);
247 if (obj_req->zret != Z_STREAM_END) {
248 unlink_or_warn(obj_req->tmpfile);
249 return;
251 if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
252 unlink_or_warn(obj_req->tmpfile);
253 return;
255 obj_req->rename =
256 move_temp_to_file(obj_req->tmpfile, obj_req->filename);
258 if (obj_req->rename == 0)
259 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
262 static void process_object_response(void *callback_data)
264 struct object_request *obj_req =
265 (struct object_request *)callback_data;
266 struct walker *walker = obj_req->walker;
267 struct walker_data *data = walker->data;
268 struct alt_base *alt = data->alt;
270 obj_req->curl_result = obj_req->slot->curl_result;
271 obj_req->http_code = obj_req->slot->http_code;
272 obj_req->slot = NULL;
273 obj_req->state = COMPLETE;
275 /* Use alternates if necessary */
276 if (missing_target(obj_req)) {
277 fetch_alternates(walker, alt->base);
278 if (obj_req->repo->next != NULL) {
279 obj_req->repo =
280 obj_req->repo->next;
281 close(obj_req->local);
282 obj_req->local = -1;
283 start_object_request(walker, obj_req);
284 return;
288 finish_object_request(obj_req);
291 static void release_object_request(struct object_request *obj_req)
293 struct object_request *entry = object_queue_head;
295 if (obj_req->local != -1)
296 error("fd leakage in release: %d", obj_req->local);
297 if (obj_req == object_queue_head) {
298 object_queue_head = obj_req->next;
299 } else {
300 while (entry->next != NULL && entry->next != obj_req)
301 entry = entry->next;
302 if (entry->next == obj_req)
303 entry->next = entry->next->next;
306 free(obj_req->url);
307 free(obj_req);
310 #ifdef USE_CURL_MULTI
311 static int fill_active_slot(struct walker *walker)
313 struct object_request *obj_req;
315 for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
316 if (obj_req->state == WAITING) {
317 if (has_sha1_file(obj_req->sha1))
318 obj_req->state = COMPLETE;
319 else {
320 start_object_request(walker, obj_req);
321 return 1;
325 return 0;
327 #endif
329 static void prefetch(struct walker *walker, unsigned char *sha1)
331 struct object_request *newreq;
332 struct object_request *tail;
333 struct walker_data *data = walker->data;
334 char *filename = sha1_file_name(sha1);
336 newreq = xmalloc(sizeof(*newreq));
337 newreq->walker = walker;
338 hashcpy(newreq->sha1, sha1);
339 newreq->repo = data->alt;
340 newreq->url = NULL;
341 newreq->local = -1;
342 newreq->state = WAITING;
343 snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
344 snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
345 "%s.temp", filename);
346 newreq->slot = NULL;
347 newreq->next = NULL;
349 if (object_queue_head == NULL) {
350 object_queue_head = newreq;
351 } else {
352 tail = object_queue_head;
353 while (tail->next != NULL) {
354 tail = tail->next;
356 tail->next = newreq;
359 #ifdef USE_CURL_MULTI
360 fill_active_slots();
361 step_active_slots();
362 #endif
365 static int fetch_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
367 char *hex = sha1_to_hex(sha1);
368 char *filename;
369 char *url;
370 char tmpfile[PATH_MAX];
371 long prev_posn = 0;
372 char range[RANGE_HEADER_SIZE];
373 struct curl_slist *range_header = NULL;
374 struct walker_data *data = walker->data;
376 FILE *indexfile;
377 struct active_request_slot *slot;
378 struct slot_results results;
380 if (has_pack_index(sha1))
381 return 0;
383 if (walker->get_verbosely)
384 fprintf(stderr, "Getting index for pack %s\n", hex);
386 url = xmalloc(strlen(repo->base) + 64);
387 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
389 filename = sha1_pack_index_name(sha1);
390 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
391 indexfile = fopen(tmpfile, "a");
392 if (!indexfile)
393 return error("Unable to open local file %s for pack index",
394 tmpfile);
396 slot = get_active_slot();
397 slot->results = &results;
398 curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
399 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
400 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
401 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
402 slot->local = indexfile;
404 /* If there is data present from a previous transfer attempt,
405 resume where it left off */
406 prev_posn = ftell(indexfile);
407 if (prev_posn>0) {
408 if (walker->get_verbosely)
409 fprintf(stderr,
410 "Resuming fetch of index for pack %s at byte %ld\n",
411 hex, prev_posn);
412 sprintf(range, "Range: bytes=%ld-", prev_posn);
413 range_header = curl_slist_append(range_header, range);
414 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
417 if (start_active_slot(slot)) {
418 run_active_slot(slot);
419 if (results.curl_result != CURLE_OK) {
420 fclose(indexfile);
421 return error("Unable to get pack index %s\n%s", url,
422 curl_errorstr);
424 } else {
425 fclose(indexfile);
426 return error("Unable to start request");
429 fclose(indexfile);
431 return move_temp_to_file(tmpfile, filename);
434 static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
436 struct packed_git *new_pack;
437 if (has_pack_file(sha1))
438 return 0; /* don't list this as something we can get */
440 if (fetch_index(walker, repo, sha1))
441 return -1;
443 new_pack = parse_pack_index(sha1);
444 if (!new_pack)
445 return -1; /* parse_pack_index() already issued error message */
446 new_pack->next = repo->packs;
447 repo->packs = new_pack;
448 return 0;
451 static void process_alternates_response(void *callback_data)
453 struct alternates_request *alt_req =
454 (struct alternates_request *)callback_data;
455 struct walker *walker = alt_req->walker;
456 struct walker_data *cdata = walker->data;
457 struct active_request_slot *slot = alt_req->slot;
458 struct alt_base *tail = cdata->alt;
459 const char *base = alt_req->base;
460 static const char null_byte = '\0';
461 char *data;
462 int i = 0;
464 if (alt_req->http_specific) {
465 if (slot->curl_result != CURLE_OK ||
466 !alt_req->buffer->len) {
468 /* Try reusing the slot to get non-http alternates */
469 alt_req->http_specific = 0;
470 sprintf(alt_req->url, "%s/objects/info/alternates",
471 base);
472 curl_easy_setopt(slot->curl, CURLOPT_URL,
473 alt_req->url);
474 active_requests++;
475 slot->in_use = 1;
476 if (slot->finished != NULL)
477 (*slot->finished) = 0;
478 if (!start_active_slot(slot)) {
479 cdata->got_alternates = -1;
480 slot->in_use = 0;
481 if (slot->finished != NULL)
482 (*slot->finished) = 1;
484 return;
486 } else if (slot->curl_result != CURLE_OK) {
487 if (!missing_target(slot)) {
488 cdata->got_alternates = -1;
489 return;
493 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
494 alt_req->buffer->len--;
495 data = alt_req->buffer->buf;
497 while (i < alt_req->buffer->len) {
498 int posn = i;
499 while (posn < alt_req->buffer->len && data[posn] != '\n')
500 posn++;
501 if (data[posn] == '\n') {
502 int okay = 0;
503 int serverlen = 0;
504 struct alt_base *newalt;
505 char *target = NULL;
506 if (data[i] == '/') {
507 /* This counts
508 * http://git.host/pub/scm/linux.git/
509 * -----------here^
510 * so memcpy(dst, base, serverlen) will
511 * copy up to "...git.host".
513 const char *colon_ss = strstr(base,"://");
514 if (colon_ss) {
515 serverlen = (strchr(colon_ss + 3, '/')
516 - base);
517 okay = 1;
519 } else if (!memcmp(data + i, "../", 3)) {
520 /* Relative URL; chop the corresponding
521 * number of subpath from base (and ../
522 * from data), and concatenate the result.
524 * The code first drops ../ from data, and
525 * then drops one ../ from data and one path
526 * from base. IOW, one extra ../ is dropped
527 * from data than path is dropped from base.
529 * This is not wrong. The alternate in
530 * http://git.host/pub/scm/linux.git/
531 * to borrow from
532 * http://git.host/pub/scm/linus.git/
533 * is ../../linus.git/objects/. You need
534 * two ../../ to borrow from your direct
535 * neighbour.
537 i += 3;
538 serverlen = strlen(base);
539 while (i + 2 < posn &&
540 !memcmp(data + i, "../", 3)) {
541 do {
542 serverlen--;
543 } while (serverlen &&
544 base[serverlen - 1] != '/');
545 i += 3;
547 /* If the server got removed, give up. */
548 okay = strchr(base, ':') - base + 3 <
549 serverlen;
550 } else if (alt_req->http_specific) {
551 char *colon = strchr(data + i, ':');
552 char *slash = strchr(data + i, '/');
553 if (colon && slash && colon < data + posn &&
554 slash < data + posn && colon < slash) {
555 okay = 1;
558 /* skip "objects\n" at end */
559 if (okay) {
560 target = xmalloc(serverlen + posn - i - 6);
561 memcpy(target, base, serverlen);
562 memcpy(target + serverlen, data + i,
563 posn - i - 7);
564 target[serverlen + posn - i - 7] = 0;
565 if (walker->get_verbosely)
566 fprintf(stderr,
567 "Also look at %s\n", target);
568 newalt = xmalloc(sizeof(*newalt));
569 newalt->next = NULL;
570 newalt->base = target;
571 newalt->got_indices = 0;
572 newalt->packs = NULL;
574 while (tail->next != NULL)
575 tail = tail->next;
576 tail->next = newalt;
579 i = posn + 1;
582 cdata->got_alternates = 1;
585 static void fetch_alternates(struct walker *walker, const char *base)
587 struct strbuf buffer = STRBUF_INIT;
588 char *url;
589 struct active_request_slot *slot;
590 struct alternates_request alt_req;
591 struct walker_data *cdata = walker->data;
593 /* If another request has already started fetching alternates,
594 wait for them to arrive and return to processing this request's
595 curl message */
596 #ifdef USE_CURL_MULTI
597 while (cdata->got_alternates == 0) {
598 step_active_slots();
600 #endif
602 /* Nothing to do if they've already been fetched */
603 if (cdata->got_alternates == 1)
604 return;
606 /* Start the fetch */
607 cdata->got_alternates = 0;
609 if (walker->get_verbosely)
610 fprintf(stderr, "Getting alternates list for %s\n", base);
612 url = xmalloc(strlen(base) + 31);
613 sprintf(url, "%s/objects/info/http-alternates", base);
615 /* Use a callback to process the result, since another request
616 may fail and need to have alternates loaded before continuing */
617 slot = get_active_slot();
618 slot->callback_func = process_alternates_response;
619 alt_req.walker = walker;
620 slot->callback_data = &alt_req;
622 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
623 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
624 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
626 alt_req.base = base;
627 alt_req.url = url;
628 alt_req.buffer = &buffer;
629 alt_req.http_specific = 1;
630 alt_req.slot = slot;
632 if (start_active_slot(slot))
633 run_active_slot(slot);
634 else
635 cdata->got_alternates = -1;
637 strbuf_release(&buffer);
638 free(url);
641 static int fetch_indices(struct walker *walker, struct alt_base *repo)
643 unsigned char sha1[20];
644 char *url;
645 struct strbuf buffer = STRBUF_INIT;
646 char *data;
647 int i = 0;
648 int ret = 0;
650 struct active_request_slot *slot;
651 struct slot_results results;
653 if (repo->got_indices)
654 return 0;
656 if (walker->get_verbosely)
657 fprintf(stderr, "Getting pack list for %s\n", repo->base);
659 url = xmalloc(strlen(repo->base) + 21);
660 sprintf(url, "%s/objects/info/packs", repo->base);
662 slot = get_active_slot();
663 slot->results = &results;
664 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
665 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
666 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
667 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
668 if (start_active_slot(slot)) {
669 run_active_slot(slot);
670 if (results.curl_result != CURLE_OK) {
671 if (missing_target(&results)) {
672 repo->got_indices = 1;
673 goto cleanup;
674 } else {
675 repo->got_indices = 0;
676 ret = error("%s", curl_errorstr);
677 goto cleanup;
680 } else {
681 repo->got_indices = 0;
682 ret = error("Unable to start request");
683 goto cleanup;
686 data = buffer.buf;
687 while (i < buffer.len) {
688 switch (data[i]) {
689 case 'P':
690 i++;
691 if (i + 52 <= buffer.len &&
692 !prefixcmp(data + i, " pack-") &&
693 !prefixcmp(data + i + 46, ".pack\n")) {
694 get_sha1_hex(data + i + 6, sha1);
695 setup_index(walker, repo, sha1);
696 i += 51;
697 break;
699 default:
700 while (i < buffer.len && data[i] != '\n')
701 i++;
703 i++;
706 repo->got_indices = 1;
707 cleanup:
708 strbuf_release(&buffer);
709 free(url);
710 return ret;
713 static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
715 char *url;
716 struct packed_git *target;
717 struct packed_git **lst;
718 FILE *packfile;
719 char *filename;
720 char tmpfile[PATH_MAX];
721 int ret;
722 long prev_posn = 0;
723 char range[RANGE_HEADER_SIZE];
724 struct curl_slist *range_header = NULL;
725 struct walker_data *data = walker->data;
727 struct active_request_slot *slot;
728 struct slot_results results;
730 if (fetch_indices(walker, repo))
731 return -1;
732 target = find_sha1_pack(sha1, repo->packs);
733 if (!target)
734 return -1;
736 if (walker->get_verbosely) {
737 fprintf(stderr, "Getting pack %s\n",
738 sha1_to_hex(target->sha1));
739 fprintf(stderr, " which contains %s\n",
740 sha1_to_hex(sha1));
743 url = xmalloc(strlen(repo->base) + 65);
744 sprintf(url, "%s/objects/pack/pack-%s.pack",
745 repo->base, sha1_to_hex(target->sha1));
747 filename = sha1_pack_name(target->sha1);
748 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
749 packfile = fopen(tmpfile, "a");
750 if (!packfile)
751 return error("Unable to open local file %s for pack",
752 tmpfile);
754 slot = get_active_slot();
755 slot->results = &results;
756 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
757 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
758 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
759 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
760 slot->local = packfile;
762 /* If there is data present from a previous transfer attempt,
763 resume where it left off */
764 prev_posn = ftell(packfile);
765 if (prev_posn>0) {
766 if (walker->get_verbosely)
767 fprintf(stderr,
768 "Resuming fetch of pack %s at byte %ld\n",
769 sha1_to_hex(target->sha1), prev_posn);
770 sprintf(range, "Range: bytes=%ld-", prev_posn);
771 range_header = curl_slist_append(range_header, range);
772 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
775 if (start_active_slot(slot)) {
776 run_active_slot(slot);
777 if (results.curl_result != CURLE_OK) {
778 fclose(packfile);
779 return error("Unable to get pack file %s\n%s", url,
780 curl_errorstr);
782 } else {
783 fclose(packfile);
784 return error("Unable to start request");
787 target->pack_size = ftell(packfile);
788 fclose(packfile);
790 ret = move_temp_to_file(tmpfile, filename);
791 if (ret)
792 return ret;
794 lst = &repo->packs;
795 while (*lst != target)
796 lst = &((*lst)->next);
797 *lst = (*lst)->next;
799 if (verify_pack(target))
800 return -1;
801 install_packed_git(target);
803 return 0;
806 static void abort_object_request(struct object_request *obj_req)
808 if (obj_req->local >= 0) {
809 close(obj_req->local);
810 obj_req->local = -1;
812 unlink_or_warn(obj_req->tmpfile);
813 if (obj_req->slot) {
814 release_active_slot(obj_req->slot);
815 obj_req->slot = NULL;
817 release_object_request(obj_req);
820 static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
822 char *hex = sha1_to_hex(sha1);
823 int ret = 0;
824 struct object_request *obj_req = object_queue_head;
826 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
827 obj_req = obj_req->next;
828 if (obj_req == NULL)
829 return error("Couldn't find request for %s in the queue", hex);
831 if (has_sha1_file(obj_req->sha1)) {
832 abort_object_request(obj_req);
833 return 0;
836 #ifdef USE_CURL_MULTI
837 while (obj_req->state == WAITING) {
838 step_active_slots();
840 #else
841 start_object_request(walker, obj_req);
842 #endif
844 while (obj_req->state == ACTIVE) {
845 run_active_slot(obj_req->slot);
847 if (obj_req->local != -1) {
848 close(obj_req->local); obj_req->local = -1;
851 if (obj_req->state == ABORTED) {
852 ret = error("Request for %s aborted", hex);
853 } else if (obj_req->curl_result != CURLE_OK &&
854 obj_req->http_code != 416) {
855 if (missing_target(obj_req))
856 ret = -1; /* Be silent, it is probably in a pack. */
857 else
858 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
859 obj_req->errorstr, obj_req->curl_result,
860 obj_req->http_code, hex);
861 } else if (obj_req->zret != Z_STREAM_END) {
862 walker->corrupt_object_found++;
863 ret = error("File %s (%s) corrupt", hex, obj_req->url);
864 } else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
865 ret = error("File %s has bad hash", hex);
866 } else if (obj_req->rename < 0) {
867 ret = error("unable to write sha1 filename %s",
868 obj_req->filename);
871 release_object_request(obj_req);
872 return ret;
875 static int fetch(struct walker *walker, unsigned char *sha1)
877 struct walker_data *data = walker->data;
878 struct alt_base *altbase = data->alt;
880 if (!fetch_object(walker, altbase, sha1))
881 return 0;
882 while (altbase) {
883 if (!fetch_pack(walker, altbase, sha1))
884 return 0;
885 fetch_alternates(walker, data->alt->base);
886 altbase = altbase->next;
888 return error("Unable to find %s under %s", sha1_to_hex(sha1),
889 data->alt->base);
892 static int fetch_ref(struct walker *walker, struct ref *ref)
894 struct walker_data *data = walker->data;
895 return http_fetch_ref(data->alt->base, ref);
898 static void cleanup(struct walker *walker)
900 struct walker_data *data = walker->data;
901 http_cleanup();
903 curl_slist_free_all(data->no_pragma_header);
906 struct walker *get_http_walker(const char *url, struct remote *remote)
908 char *s;
909 struct walker_data *data = xmalloc(sizeof(struct walker_data));
910 struct walker *walker = xmalloc(sizeof(struct walker));
912 http_init(remote);
914 data->no_pragma_header = curl_slist_append(NULL, "Pragma:");
916 data->alt = xmalloc(sizeof(*data->alt));
917 data->alt->base = xmalloc(strlen(url) + 1);
918 strcpy(data->alt->base, url);
919 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
920 *s = 0;
922 data->alt->got_indices = 0;
923 data->alt->packs = NULL;
924 data->alt->next = NULL;
925 data->got_alternates = -1;
927 walker->corrupt_object_found = 0;
928 walker->fetch = fetch;
929 walker->fetch_ref = fetch_ref;
930 walker->prefetch = prefetch;
931 walker->cleanup = cleanup;
932 walker->data = data;
934 #ifdef USE_CURL_MULTI
935 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
936 #endif
938 return walker;