Add support for parallel HTTP transfers
[git/git.git] / http-fetch.c
CommitLineData
6eb7ed54
DB
1#include "cache.h"
2#include "commit.h"
271421cd 3#include "pack.h"
215a7ad1 4#include "fetch.h"
4250a5e5 5
6eb7ed54
DB
6#include <curl/curl.h>
7#include <curl/easy.h>
8
1d389ab6
NH
9#define DEFAULT_MAX_REQUESTS 5
10
4a30976e
JS
11#if LIBCURL_VERSION_NUM < 0x070704
12#define curl_global_cleanup() do { /* nothing */ } while(0)
13#endif
14#if LIBCURL_VERSION_NUM < 0x070800
15#define curl_global_init(a) do { /* nothing */ } while(0)
16#endif
4a30976e 17
49a0f240
NH
18#define PREV_BUF_SIZE 4096
19#define RANGE_HEADER_SIZE 30
20
1d389ab6
NH
21static int max_requests = DEFAULT_MAX_REQUESTS;
22static int active_requests = 0;
23static int data_received;
24
25static CURLM *curlm;
26static CURL *curl_default;
1db69b57 27static struct curl_slist *no_pragma_header;
49a0f240 28static struct curl_slist *no_range_header;
1ddea77e 29static char curl_errorstr[CURL_ERROR_SIZE];
6eb7ed54 30
b3661567
DB
31struct alt_base
32{
33 char *base;
34 int got_indices;
35 struct packed_git *packs;
36 struct alt_base *next;
37};
38
a7928f8e 39static struct alt_base *alt = NULL;
6eb7ed54 40
1d389ab6
NH
41enum transfer_state {
42 WAITING,
43 ABORTED,
44 ACTIVE,
45 COMPLETE,
46};
6eb7ed54 47
1d389ab6
NH
48struct transfer_request
49{
50 unsigned char sha1[20];
51 struct alt_base *repo;
52 char *url;
53 char filename[PATH_MAX];
54 char tmpfile[PATH_MAX];
55 int local;
56 enum transfer_state state;
57 CURLcode curl_result;
58 char errorstr[CURL_ERROR_SIZE];
59 long http_code;
60 unsigned char real_sha1[20];
61 SHA_CTX c;
62 z_stream stream;
63 int zret;
64 int rename;
65 struct active_request_slot *slot;
66 struct transfer_request *next;
67};
68
69struct active_request_slot
70{
71 CURL *curl;
72 FILE *local;
73 int in_use;
74 int done;
75 CURLcode curl_result;
76 struct active_request_slot *next;
77};
78
79static struct transfer_request *request_queue_head = NULL;
80static struct active_request_slot *active_queue_head = NULL;
6eb7ed54 81
3dcb90f5 82static int curl_ssl_verify;
5acb6de1
NH
83static char *ssl_cert;
84static char *ssl_key;
85static char *ssl_capath;
86static char *ssl_cainfo;
3dcb90f5 87
fa3e0655
DB
88struct buffer
89{
90 size_t posn;
91 size_t size;
92 void *buffer;
93};
94
95static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
182005b9
DB
96 struct buffer *buffer)
97{
fa3e0655
DB
98 size_t size = eltsize * nmemb;
99 if (size > buffer->size - buffer->posn)
100 size = buffer->size - buffer->posn;
101 memcpy(buffer->buffer + buffer->posn, ptr, size);
102 buffer->posn += size;
1d389ab6 103 data_received++;
fa3e0655
DB
104 return size;
105}
106
182005b9
DB
107static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
108 void *data)
109{
bf0f910d 110 unsigned char expn[4096];
6eb7ed54
DB
111 size_t size = eltsize * nmemb;
112 int posn = 0;
1d389ab6 113 struct transfer_request *request = (struct transfer_request *)data;
6eb7ed54 114 do {
1d389ab6
NH
115 ssize_t retval = write(request->local,
116 ptr + posn, size - posn);
6eb7ed54
DB
117 if (retval < 0)
118 return posn;
119 posn += retval;
120 } while (posn < size);
121
1d389ab6
NH
122 request->stream.avail_in = size;
123 request->stream.next_in = ptr;
6eb7ed54 124 do {
1d389ab6
NH
125 request->stream.next_out = expn;
126 request->stream.avail_out = sizeof(expn);
127 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
128 SHA1_Update(&request->c, expn,
129 sizeof(expn) - request->stream.avail_out);
130 } while (request->stream.avail_in && request->zret == Z_OK);
131 data_received++;
6eb7ed54
DB
132 return size;
133}
134
49a0f240
NH
135int relink_or_rename(char *old, char *new) {
136 int ret;
137
138 ret = link(old, new);
139 if (ret < 0) {
140 /* Same Coda hack as in write_sha1_file(sha1_file.c) */
141 ret = errno;
142 if (ret == EXDEV && !rename(old, new))
143 return 0;
144 }
145 unlink(old);
146 if (ret) {
147 if (ret != EEXIST)
148 return ret;
149 }
150
151 return 0;
152}
153
1d389ab6
NH
154void process_curl_messages();
155void process_request_queue();
156
157struct active_request_slot *get_active_slot()
158{
159 struct active_request_slot *slot = active_queue_head;
160 struct active_request_slot *newslot;
161 int num_transfers;
162
163 /* Wait for a slot to open up if the queue is full */
164 while (active_requests >= max_requests) {
165 curl_multi_perform(curlm, &num_transfers);
166 if (num_transfers < active_requests) {
167 process_curl_messages();
168 }
169 }
170
171 while (slot != NULL && slot->in_use) {
172 slot = slot->next;
173 }
174 if (slot == NULL) {
175 newslot = xmalloc(sizeof(*newslot));
176 newslot->curl = curl_easy_duphandle(curl_default);
177 newslot->in_use = 0;
178 newslot->next = NULL;
179
180 slot = active_queue_head;
181 if (slot == NULL) {
182 active_queue_head = newslot;
183 } else {
184 while (slot->next != NULL) {
185 slot = slot->next;
186 }
187 slot->next = newslot;
188 }
189 slot = newslot;
190 }
191
192 active_requests++;
193 slot->in_use = 1;
194 slot->done = 0;
195 slot->local = NULL;
196 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
197 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
198 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
199
200 return slot;
201}
202
203int start_active_slot(struct active_request_slot *slot)
204{
205 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
206
207 if (curlm_result != CURLM_OK &&
208 curlm_result != CURLM_CALL_MULTI_PERFORM) {
209 active_requests--;
210 slot->in_use = 0;
211 return 0;
212 }
213
214 return 1;
215}
216
217void run_active_slot(struct active_request_slot *slot)
218{
219 int num_transfers;
220 long last_pos = 0;
221 long current_pos;
222 fd_set readfds;
223 fd_set writefds;
224 fd_set excfds;
225 int max_fd;
226 struct timeval select_timeout;
227 CURLMcode curlm_result;
228
229 while (!slot->done) {
230 data_received = 0;
231 do {
232 curlm_result = curl_multi_perform(curlm,
233 &num_transfers);
234 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
235 if (num_transfers < active_requests) {
236 process_curl_messages();
237 process_request_queue();
238 }
239
240 if (!data_received && slot->local != NULL) {
241 current_pos = ftell(slot->local);
242 if (current_pos > last_pos)
243 data_received++;
244 last_pos = current_pos;
245 }
246
247 if (!slot->done && !data_received) {
248 max_fd = 0;
249 FD_ZERO(&readfds);
250 FD_ZERO(&writefds);
251 FD_ZERO(&excfds);
252 select_timeout.tv_sec = 0;
253 select_timeout.tv_usec = 50000;
254 select(max_fd, &readfds, &writefds,
255 &excfds, &select_timeout);
256 }
257 }
258}
259
260void start_request(struct transfer_request *request)
261{
262 char *hex = sha1_to_hex(request->sha1);
263 char prevfile[PATH_MAX];
264 char *url;
265 char *posn;
266 int prevlocal;
267 unsigned char prev_buf[PREV_BUF_SIZE];
268 ssize_t prev_read = 0;
269 long prev_posn = 0;
270 char range[RANGE_HEADER_SIZE];
271 struct curl_slist *range_header = NULL;
272 struct active_request_slot *slot;
273
274 snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
275 unlink(prevfile);
276 rename(request->tmpfile, prevfile);
277 unlink(request->tmpfile);
278
279 request->local = open(request->tmpfile,
280 O_WRONLY | O_CREAT | O_EXCL, 0666);
281 if (request->local < 0) {
282 request->state = ABORTED;
283 error("Couldn't create temporary file %s for %s: %s\n",
284 request->tmpfile, request->filename, strerror(errno));
285 return;
286 }
287
288 memset(&request->stream, 0, sizeof(request->stream));
289
290 inflateInit(&request->stream);
291
292 SHA1_Init(&request->c);
293
294 url = xmalloc(strlen(request->repo->base) + 50);
295 request->url = xmalloc(strlen(request->repo->base) + 50);
296 strcpy(url, request->repo->base);
297 posn = url + strlen(request->repo->base);
298 strcpy(posn, "objects/");
299 posn += 8;
300 memcpy(posn, hex, 2);
301 posn += 2;
302 *(posn++) = '/';
303 strcpy(posn, hex + 2);
304 strcpy(request->url, url);
305
306 /* If a previous temp file is present, process what was already
307 fetched. */
308 prevlocal = open(prevfile, O_RDONLY);
309 if (prevlocal != -1) {
310 do {
311 prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
312 if (prev_read>0) {
313 if (fwrite_sha1_file(prev_buf,
314 1,
315 prev_read,
316 request) == prev_read) {
317 prev_posn += prev_read;
318 } else {
319 prev_read = -1;
320 }
321 }
322 } while (prev_read > 0);
323 close(prevlocal);
324 }
325 unlink(prevfile);
326
327 /* Reset inflate/SHA1 if there was an error reading the previous temp
328 file; also rewind to the beginning of the local file. */
329 if (prev_read == -1) {
330 memset(&request->stream, 0, sizeof(request->stream));
331 inflateInit(&request->stream);
332 SHA1_Init(&request->c);
333 if (prev_posn>0) {
334 prev_posn = 0;
335 lseek(request->local, SEEK_SET, 0);
336 ftruncate(request->local, 0);
337 }
338 }
339
340 slot = get_active_slot();
341 curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
342 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
343 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
344 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
345
346 /* If we have successfully processed data from a previous fetch
347 attempt, only fetch the data we don't already have. */
348 if (prev_posn>0) {
349 if (get_verbosely)
350 fprintf(stderr,
351 "Resuming fetch of object %s at byte %ld\n",
352 hex, prev_posn);
353 sprintf(range, "Range: bytes=%ld-", prev_posn);
354 range_header = curl_slist_append(range_header, range);
355 curl_easy_setopt(slot->curl,
356 CURLOPT_HTTPHEADER, range_header);
357 }
358
359 /* Try to add to multi handle, abort the request on error */
360 if (!start_active_slot(slot)) {
361 request->state = ABORTED;
362 close(request->local);
363 free(request->url);
364 return;
365 }
366
367 request->slot = slot;
368 request->state = ACTIVE;
369}
370
371void finish_request(struct transfer_request *request)
372{
373 fchmod(request->local, 0444);
374 close(request->local);
375
376 if (request->http_code == 416) {
377 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
378 } else if (request->curl_result != CURLE_OK) {
379 return;
380 }
381
382 inflateEnd(&request->stream);
383 SHA1_Final(request->real_sha1, &request->c);
384 if (request->zret != Z_STREAM_END) {
385 unlink(request->tmpfile);
386 return;
387 }
388 if (memcmp(request->sha1, request->real_sha1, 20)) {
389 unlink(request->tmpfile);
390 return;
391 }
392 request->rename =
393 relink_or_rename(request->tmpfile, request->filename);
394
395 if (request->rename == 0)
396 pull_say("got %s\n", sha1_to_hex(request->sha1));
397}
398
399void release_request(struct transfer_request *request)
400{
401 struct transfer_request *entry = request_queue_head;
402
403 if (request == request_queue_head) {
404 request_queue_head = request->next;
405 } else {
406 while (entry->next != NULL && entry->next != request)
407 entry = entry->next;
408 if (entry->next == request)
409 entry->next = entry->next->next;
410 }
411
412 free(request->url);
413 free(request);
414}
415
416void process_curl_messages()
417{
418 int num_messages;
419 struct active_request_slot *slot;
420 struct transfer_request *request = NULL;
421 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
422
423 while (curl_message != NULL) {
424 if (curl_message->msg == CURLMSG_DONE) {
425 slot = active_queue_head;
426 while (slot != NULL &&
427 slot->curl != curl_message->easy_handle)
428 slot = slot->next;
429 if (slot != NULL) {
430 curl_multi_remove_handle(curlm, slot->curl);
431 active_requests--;
432 slot->done = 1;
433 slot->in_use = 0;
434 slot->curl_result = curl_message->data.result;
435 request = request_queue_head;
436 while (request != NULL &&
437 request->slot != slot)
438 request = request->next;
439 } else {
440 fprintf(stderr, "Received DONE message for unknown request!\n");
441 }
442 if (request != NULL) {
443 request->curl_result =
444 curl_message->data.result;
445 curl_easy_getinfo(slot->curl,
446 CURLINFO_HTTP_CODE,
447 &request->http_code);
448 request->slot = NULL;
449
450 /* Use alternates if necessary */
451 if (request->http_code == 404 &&
452 request->repo->next != NULL) {
453 request->repo = request->repo->next;
454 start_request(request);
455 } else {
456 finish_request(request);
457 request->state = COMPLETE;
458 }
459 }
460 } else {
461 fprintf(stderr, "Unknown CURL message received: %d\n",
462 (int)curl_message->msg);
463 }
464 curl_message = curl_multi_info_read(curlm, &num_messages);
465 }
466}
467
468void process_request_queue()
469{
470 struct transfer_request *request = request_queue_head;
471 int num_transfers;
472
473 while (active_requests < max_requests && request != NULL) {
474 if (request->state == WAITING) {
475 start_request(request);
476 curl_multi_perform(curlm, &num_transfers);
477 }
478 request = request->next;
479 }
480}
481
482void prefetch(unsigned char *sha1)
483{
484 struct transfer_request *newreq;
485 struct transfer_request *tail;
486 char *filename = sha1_file_name(sha1);
487
488 newreq = xmalloc(sizeof(*newreq));
489 memcpy(newreq->sha1, sha1, 20);
490 newreq->repo = alt;
491 newreq->url = NULL;
492 newreq->local = -1;
493 newreq->state = WAITING;
494 snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
495 snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
496 "%s.temp", filename);
497 newreq->next = NULL;
498
499 if (request_queue_head == NULL) {
500 request_queue_head = newreq;
501 } else {
502 tail = request_queue_head;
503 while (tail->next != NULL) {
504 tail = tail->next;
505 }
506 tail->next = newreq;
507 }
508 process_request_queue();
509 process_curl_messages();
510}
511
b3661567 512static int got_alternates = 0;
182005b9 513
b3661567 514static int fetch_index(struct alt_base *repo, unsigned char *sha1)
182005b9 515{
1d389ab6 516 char *hex = sha1_to_hex(sha1);
182005b9
DB
517 char *filename;
518 char *url;
49a0f240
NH
519 char tmpfile[PATH_MAX];
520 int ret;
521 long prev_posn = 0;
522 char range[RANGE_HEADER_SIZE];
523 struct curl_slist *range_header = NULL;
182005b9
DB
524
525 FILE *indexfile;
1d389ab6 526 struct active_request_slot *slot;
182005b9
DB
527
528 if (has_pack_index(sha1))
529 return 0;
530
531 if (get_verbosely)
1d389ab6 532 fprintf(stderr, "Getting index for pack %s\n", hex);
182005b9 533
b3661567 534 url = xmalloc(strlen(repo->base) + 64);
1d389ab6 535 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
182005b9
DB
536
537 filename = sha1_pack_index_name(sha1);
49a0f240
NH
538 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
539 indexfile = fopen(tmpfile, "a");
182005b9
DB
540 if (!indexfile)
541 return error("Unable to open local file %s for pack index",
542 filename);
543
1d389ab6
NH
544 slot = get_active_slot();
545 curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
546 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
547 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
548 slot->local = indexfile;
549
49a0f240
NH
550 /* If there is data present from a previous transfer attempt,
551 resume where it left off */
552 prev_posn = ftell(indexfile);
553 if (prev_posn>0) {
554 if (get_verbosely)
555 fprintf(stderr,
556 "Resuming fetch of index for pack %s at byte %ld\n",
1d389ab6 557 hex, prev_posn);
49a0f240
NH
558 sprintf(range, "Range: bytes=%ld-", prev_posn);
559 range_header = curl_slist_append(range_header, range);
1d389ab6 560 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
561 }
562
1d389ab6
NH
563 if (start_active_slot(slot)) {
564 run_active_slot(slot);
565 if (slot->curl_result != CURLE_OK) {
566 fclose(indexfile);
567 return error("Unable to get pack index %s\n%s", url,
568 curl_errorstr);
569 }
570 } else {
571 return error("Unable to start request");
182005b9
DB
572 }
573
574 fclose(indexfile);
49a0f240
NH
575
576 ret = relink_or_rename(tmpfile, filename);
577 if (ret)
578 return error("unable to write index filename %s: %s",
579 filename, strerror(ret));
580
182005b9
DB
581 return 0;
582}
583
b3661567 584static int setup_index(struct alt_base *repo, unsigned char *sha1)
182005b9
DB
585{
586 struct packed_git *new_pack;
587 if (has_pack_file(sha1))
588 return 0; // don't list this as something we can get
589
b3661567 590 if (fetch_index(repo, sha1))
182005b9
DB
591 return -1;
592
593 new_pack = parse_pack_index(sha1);
b3661567
DB
594 new_pack->next = repo->packs;
595 repo->packs = new_pack;
182005b9
DB
596 return 0;
597}
598
b3661567
DB
599static int fetch_alternates(char *base)
600{
601 int ret = 0;
602 struct buffer buffer;
603 char *url;
604 char *data;
605 int i = 0;
1b0c1e67 606 int http_specific = 1;
1d389ab6
NH
607 struct alt_base *tail = alt;
608
609 struct active_request_slot *slot;
b3661567
DB
610 if (got_alternates)
611 return 0;
612 data = xmalloc(4096);
1b0c1e67 613 buffer.size = 4095;
b3661567
DB
614 buffer.posn = 0;
615 buffer.buffer = data;
616
617 if (get_verbosely)
618 fprintf(stderr, "Getting alternates list\n");
619
620 url = xmalloc(strlen(base) + 31);
621 sprintf(url, "%s/objects/info/http-alternates", base);
622
1d389ab6
NH
623 slot = get_active_slot();
624 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
625 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
626 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
627 if (start_active_slot(slot)) {
628 run_active_slot(slot);
629 if (slot->curl_result != CURLE_OK || !buffer.posn) {
630 http_specific = 0;
631
632 sprintf(url, "%s/objects/info/alternates", base);
633
634 slot = get_active_slot();
635 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
636 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
637 fwrite_buffer);
638 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
639 if (start_active_slot(slot)) {
640 run_active_slot(slot);
641 if (slot->curl_result != CURLE_OK) {
642 return 0;
643 }
644 }
b3661567 645 }
1d389ab6
NH
646 } else {
647 return 0;
b3661567
DB
648 }
649
1b0c1e67
DB
650 data[buffer.posn] = '\0';
651
b3661567
DB
652 while (i < buffer.posn) {
653 int posn = i;
654 while (posn < buffer.posn && data[posn] != '\n')
655 posn++;
656 if (data[posn] == '\n') {
1b0c1e67
DB
657 int okay = 0;
658 int serverlen = 0;
659 struct alt_base *newalt;
660 char *target = NULL;
b3661567 661 if (data[i] == '/') {
1b0c1e67
DB
662 serverlen = strchr(base + 8, '/') - base;
663 okay = 1;
664 } else if (!memcmp(data + i, "../", 3)) {
665 i += 3;
666 serverlen = strlen(base);
667 while (i + 2 < posn &&
668 !memcmp(data + i, "../", 3)) {
669 do {
670 serverlen--;
671 } while (serverlen &&
672 base[serverlen - 1] != '/');
673 i += 3;
674 }
675 // If the server got removed, give up.
676 okay = strchr(base, ':') - base + 3 <
677 serverlen;
678 } else if (http_specific) {
679 char *colon = strchr(data + i, ':');
680 char *slash = strchr(data + i, '/');
681 if (colon && slash && colon < data + posn &&
682 slash < data + posn && colon < slash) {
683 okay = 1;
684 }
685 }
686 // skip 'objects' at end
687 if (okay) {
688 target = xmalloc(serverlen + posn - i - 6);
b3661567
DB
689 strncpy(target, base, serverlen);
690 strncpy(target + serverlen, data + i,
691 posn - i - 7);
692 target[serverlen + posn - i - 7] = '\0';
693 if (get_verbosely)
694 fprintf(stderr,
695 "Also look at %s\n", target);
696 newalt = xmalloc(sizeof(*newalt));
1d389ab6 697 newalt->next = NULL;
b3661567
DB
698 newalt->base = target;
699 newalt->got_indices = 0;
700 newalt->packs = NULL;
1d389ab6
NH
701 while (tail->next != NULL)
702 tail = tail->next;
703 tail->next = newalt;
b3661567
DB
704 ret++;
705 }
706 }
707 i = posn + 1;
708 }
709 got_alternates = 1;
710
711 return ret;
712}
713
714static int fetch_indices(struct alt_base *repo)
182005b9
DB
715{
716 unsigned char sha1[20];
717 char *url;
718 struct buffer buffer;
719 char *data;
720 int i = 0;
721
1d389ab6
NH
722 struct active_request_slot *slot;
723
b3661567 724 if (repo->got_indices)
182005b9
DB
725 return 0;
726
727 data = xmalloc(4096);
728 buffer.size = 4096;
729 buffer.posn = 0;
730 buffer.buffer = data;
731
732 if (get_verbosely)
733 fprintf(stderr, "Getting pack list\n");
734
b3661567
DB
735 url = xmalloc(strlen(repo->base) + 21);
736 sprintf(url, "%s/objects/info/packs", repo->base);
182005b9 737
1d389ab6
NH
738 slot = get_active_slot();
739 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
740 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
741 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
742 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
743 if (start_active_slot(slot)) {
744 run_active_slot(slot);
745 if (slot->curl_result != CURLE_OK)
746 return error("%s", curl_errorstr);
747 } else {
748 return error("Unable to start request");
749 }
182005b9 750
b3661567 751 while (i < buffer.posn) {
182005b9
DB
752 switch (data[i]) {
753 case 'P':
754 i++;
755 if (i + 52 < buffer.posn &&
756 !strncmp(data + i, " pack-", 6) &&
757 !strncmp(data + i + 46, ".pack\n", 6)) {
758 get_sha1_hex(data + i + 6, sha1);
b3661567 759 setup_index(repo, sha1);
182005b9
DB
760 i += 51;
761 break;
762 }
763 default:
764 while (data[i] != '\n')
765 i++;
766 }
767 i++;
b3661567 768 }
182005b9 769
b3661567 770 repo->got_indices = 1;
182005b9
DB
771 return 0;
772}
773
b3661567 774static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
182005b9
DB
775{
776 char *url;
777 struct packed_git *target;
778 struct packed_git **lst;
779 FILE *packfile;
780 char *filename;
49a0f240
NH
781 char tmpfile[PATH_MAX];
782 int ret;
783 long prev_posn = 0;
784 char range[RANGE_HEADER_SIZE];
785 struct curl_slist *range_header = NULL;
1d389ab6
NH
786
787 struct active_request_slot *slot;
182005b9 788
b3661567 789 if (fetch_indices(repo))
182005b9 790 return -1;
b3661567 791 target = find_sha1_pack(sha1, repo->packs);
182005b9 792 if (!target)
b3661567 793 return -1;
182005b9
DB
794
795 if (get_verbosely) {
796 fprintf(stderr, "Getting pack %s\n",
797 sha1_to_hex(target->sha1));
798 fprintf(stderr, " which contains %s\n",
799 sha1_to_hex(sha1));
800 }
801
b3661567 802 url = xmalloc(strlen(repo->base) + 65);
182005b9 803 sprintf(url, "%s/objects/pack/pack-%s.pack",
b3661567 804 repo->base, sha1_to_hex(target->sha1));
182005b9
DB
805
806 filename = sha1_pack_name(target->sha1);
49a0f240
NH
807 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
808 packfile = fopen(tmpfile, "a");
182005b9
DB
809 if (!packfile)
810 return error("Unable to open local file %s for pack",
811 filename);
812
1d389ab6
NH
813 slot = get_active_slot();
814 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
815 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
816 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
817 slot->local = packfile;
1ddea77e 818
49a0f240
NH
819 /* If there is data present from a previous transfer attempt,
820 resume where it left off */
821 prev_posn = ftell(packfile);
822 if (prev_posn>0) {
823 if (get_verbosely)
824 fprintf(stderr,
825 "Resuming fetch of pack %s at byte %ld\n",
826 sha1_to_hex(target->sha1), prev_posn);
827 sprintf(range, "Range: bytes=%ld-", prev_posn);
828 range_header = curl_slist_append(range_header, range);
1d389ab6 829 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
49a0f240
NH
830 }
831
1d389ab6
NH
832 if (start_active_slot(slot)) {
833 run_active_slot(slot);
834 if (slot->curl_result != CURLE_OK) {
835 fclose(packfile);
836 return error("Unable to get pack file %s\n%s", url,
837 curl_errorstr);
838 }
839 } else {
840 return error("Unable to start request");
182005b9
DB
841 }
842
843 fclose(packfile);
844
49a0f240
NH
845 ret = relink_or_rename(tmpfile, filename);
846 if (ret)
847 return error("unable to write pack filename %s: %s",
848 filename, strerror(ret));
849
b3661567 850 lst = &repo->packs;
182005b9
DB
851 while (*lst != target)
852 lst = &((*lst)->next);
853 *lst = (*lst)->next;
854
271421cd
JH
855 if (verify_pack(target, 0))
856 return -1;
182005b9
DB
857 install_packed_git(target);
858
859 return 0;
860}
861
a7928f8e 862static int fetch_object(struct alt_base *repo, unsigned char *sha1)
6eb7ed54
DB
863{
864 char *hex = sha1_to_hex(sha1);
09d92083 865 int ret;
1d389ab6
NH
866 struct transfer_request *request = request_queue_head;
867 int num_transfers;
868
869 while (request != NULL && memcmp(request->sha1, sha1, 20))
870 request = request->next;
871 if (request == NULL)
872 return error("Couldn't find request for %s in the queue", hex);
873
874 while (request->state == WAITING) {
875 curl_multi_perform(curlm, &num_transfers);
876 if (num_transfers < active_requests) {
877 process_curl_messages();
878 process_request_queue();
879 }
880 }
6eb7ed54 881
1d389ab6
NH
882 if (request->state == ACTIVE)
883 run_active_slot(request->slot);
6eb7ed54 884
1d389ab6
NH
885 if (request->state == ABORTED) {
886 release_request(request);
887 return error("Request for %s aborted", hex);
49a0f240 888 }
49a0f240 889
1d389ab6
NH
890 if (request->curl_result != CURLE_OK && request->http_code != 416) {
891 ret = error("%s", request->errorstr);
892 release_request(request);
893 return ret;
49a0f240
NH
894 }
895
1d389ab6
NH
896 if (request->zret != Z_STREAM_END) {
897 ret = error("File %s (%s) corrupt\n", hex, request->url);
898 release_request(request);
899 return ret;
49a0f240
NH
900 }
901
1d389ab6
NH
902 if (memcmp(request->sha1, request->real_sha1, 20)) {
903 release_request(request);
904 return error("File %s has bad hash\n", hex);
182005b9 905 }
6eb7ed54 906
1d389ab6
NH
907 if (request->rename < 0) {
908 ret = error("unable to write sha1 filename %s: %s",
909 request->filename,
910 strerror(request->rename));
911 release_request(request);
912 return ret;
6eb7ed54 913 }
49a0f240 914
1d389ab6 915 release_request(request);
6eb7ed54
DB
916 return 0;
917}
918
b3661567
DB
919int fetch(unsigned char *sha1)
920{
921 struct alt_base *altbase = alt;
1d389ab6
NH
922
923 if (!fetch_object(altbase, sha1))
924 return 0;
b3661567 925 while (altbase) {
b3661567
DB
926 if (!fetch_pack(altbase, sha1))
927 return 0;
b3661567
DB
928 altbase = altbase->next;
929 }
930 return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
1d389ab6 931 alt->base);
b3661567
DB
932}
933
cd541a68
DB
934int fetch_ref(char *ref, unsigned char *sha1)
935{
fa3e0655
DB
936 char *url, *posn;
937 char hex[42];
938 struct buffer buffer;
1d389ab6
NH
939 char *base = alt->base;
940 struct active_request_slot *slot;
fa3e0655
DB
941 buffer.size = 41;
942 buffer.posn = 0;
943 buffer.buffer = hex;
944 hex[41] = '\0';
945
fa3e0655
DB
946 url = xmalloc(strlen(base) + 6 + strlen(ref));
947 strcpy(url, base);
948 posn = url + strlen(base);
949 strcpy(posn, "refs/");
950 posn += 5;
951 strcpy(posn, ref);
952
1d389ab6
NH
953 slot = get_active_slot();
954 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
955 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
956 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
957 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
958 if (start_active_slot(slot)) {
959 run_active_slot(slot);
960 if (slot->curl_result != CURLE_OK)
961 return error("Couldn't get %s for %s\n%s",
962 url, ref, curl_errorstr);
963 } else {
964 return error("Unable to start request");
965 }
fa3e0655
DB
966
967 hex[40] = '\0';
968 get_sha1_hex(hex, sha1);
969 return 0;
cd541a68
DB
970}
971
6eb7ed54
DB
972int main(int argc, char **argv)
973{
974 char *commit_id;
975 char *url;
976 int arg = 1;
1d389ab6 977 struct active_request_slot *slot;
6eb7ed54
DB
978
979 while (arg < argc && argv[arg][0] == '-') {
980 if (argv[arg][1] == 't') {
4250a5e5 981 get_tree = 1;
6eb7ed54 982 } else if (argv[arg][1] == 'c') {
4250a5e5 983 get_history = 1;
6eb7ed54 984 } else if (argv[arg][1] == 'a') {
4250a5e5
DB
985 get_all = 1;
986 get_tree = 1;
987 get_history = 1;
e78d9772
JH
988 } else if (argv[arg][1] == 'v') {
989 get_verbosely = 1;
fa3e0655
DB
990 } else if (argv[arg][1] == 'w') {
991 write_ref = argv[arg + 1];
992 arg++;
820eca68
DB
993 } else if (!strcmp(argv[arg], "--recover")) {
994 get_recover = 1;
1d389ab6
NH
995 } else if (argv[arg][1] == 'r') {
996 max_requests = atoi(argv[arg + 1]);
997 if (max_requests < 1)
998 max_requests = DEFAULT_MAX_REQUESTS;
999 arg++;
6eb7ed54
DB
1000 }
1001 arg++;
1002 }
1003 if (argc < arg + 2) {
215a7ad1 1004 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
6eb7ed54
DB
1005 return 1;
1006 }
1007 commit_id = argv[arg];
1008 url = argv[arg + 1];
1009
6eb7ed54
DB
1010 curl_global_init(CURL_GLOBAL_ALL);
1011
1d389ab6
NH
1012 curlm = curl_multi_init();
1013 if (curlm == NULL) {
1014 fprintf(stderr, "Error creating curl multi handle.\n");
1015 return 1;
1016 }
1db69b57 1017 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
49a0f240 1018 no_range_header = curl_slist_append(no_range_header, "Range:");
6eb7ed54 1019
1d389ab6
NH
1020 curl_default = curl_easy_init();
1021
a9ab586a 1022 curl_ssl_verify = getenv("GIT_SSL_NO_VERIFY") ? 0 : 1;
1d389ab6 1023 curl_easy_setopt(curl_default, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
9f6cf65e 1024#if LIBCURL_VERSION_NUM >= 0x070907
1d389ab6 1025 curl_easy_setopt(curl_default, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
9f6cf65e 1026#endif
3dcb90f5 1027
5acb6de1 1028 if ((ssl_cert = getenv("GIT_SSL_CERT")) != NULL) {
1d389ab6 1029 curl_easy_setopt(curl_default, CURLOPT_SSLCERT, ssl_cert);
5acb6de1 1030 }
7d167feb 1031#if LIBCURL_VERSION_NUM >= 0x070902
5acb6de1 1032 if ((ssl_key = getenv("GIT_SSL_KEY")) != NULL) {
1d389ab6 1033 curl_easy_setopt(curl_default, CURLOPT_SSLKEY, ssl_key);
5acb6de1 1034 }
7d167feb 1035#endif
5acb6de1
NH
1036#if LIBCURL_VERSION_NUM >= 0x070908
1037 if ((ssl_capath = getenv("GIT_SSL_CAPATH")) != NULL) {
1d389ab6 1038 curl_easy_setopt(curl_default, CURLOPT_CAPATH, ssl_capath);
5acb6de1
NH
1039 }
1040#endif
1041 if ((ssl_cainfo = getenv("GIT_SSL_CAINFO")) != NULL) {
1d389ab6 1042 curl_easy_setopt(curl_default, CURLOPT_CAINFO, ssl_cainfo);
5acb6de1 1043 }
1d389ab6 1044 curl_easy_setopt(curl_default, CURLOPT_FAILONERROR, 1);
5acb6de1 1045
b3661567
DB
1046 alt = xmalloc(sizeof(*alt));
1047 alt->base = url;
1048 alt->got_indices = 0;
1049 alt->packs = NULL;
1050 alt->next = NULL;
1d389ab6 1051 fetch_alternates(alt->base);
6eb7ed54 1052
4250a5e5 1053 if (pull(commit_id))
6eb7ed54
DB
1054 return 1;
1055
1db69b57 1056 curl_slist_free_all(no_pragma_header);
1d389ab6
NH
1057 curl_slist_free_all(no_range_header);
1058 curl_easy_cleanup(curl_default);
1059 slot = active_queue_head;
1060 while (slot != NULL) {
1061 curl_easy_cleanup(slot->curl);
1062 slot = slot->next;
1063 }
1064 curl_multi_cleanup(curlm);
6eb7ed54
DB
1065 curl_global_cleanup();
1066 return 0;
1067}