7b1b2a02dc873b8d3a3a17c3e4f3c0a389d28f6d
[git/git.git] / http-fetch.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "pack.h"
4 #include "fetch.h"
5 #include "http.h"
6
7 #define PREV_BUF_SIZE 4096
8 #define RANGE_HEADER_SIZE 30
9
10 static int got_alternates = -1;
11
12 static struct curl_slist *no_pragma_header;
13
14 struct alt_base
15 {
16 char *base;
17 int got_indices;
18 struct packed_git *packs;
19 struct alt_base *next;
20 };
21
22 static struct alt_base *alt = NULL;
23
24 enum object_request_state {
25 WAITING,
26 ABORTED,
27 ACTIVE,
28 COMPLETE,
29 };
30
31 struct object_request
32 {
33 unsigned char sha1[20];
34 struct alt_base *repo;
35 char *url;
36 char filename[PATH_MAX];
37 char tmpfile[PATH_MAX];
38 int local;
39 enum object_request_state state;
40 CURLcode curl_result;
41 char errorstr[CURL_ERROR_SIZE];
42 long http_code;
43 unsigned char real_sha1[20];
44 SHA_CTX c;
45 z_stream stream;
46 int zret;
47 int rename;
48 struct active_request_slot *slot;
49 struct object_request *next;
50 };
51
52 struct alternates_request {
53 char *base;
54 char *url;
55 struct buffer *buffer;
56 struct active_request_slot *slot;
57 int http_specific;
58 };
59
60 static struct object_request *object_queue_head = NULL;
61
62 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
63 void *data)
64 {
65 unsigned char expn[4096];
66 size_t size = eltsize * nmemb;
67 int posn = 0;
68 struct object_request *obj_req = (struct object_request *)data;
69 do {
70 ssize_t retval = write(obj_req->local,
71 ptr + posn, size - posn);
72 if (retval < 0)
73 return posn;
74 posn += retval;
75 } while (posn < size);
76
77 obj_req->stream.avail_in = size;
78 obj_req->stream.next_in = ptr;
79 do {
80 obj_req->stream.next_out = expn;
81 obj_req->stream.avail_out = sizeof(expn);
82 obj_req->zret = inflate(&obj_req->stream, Z_SYNC_FLUSH);
83 SHA1_Update(&obj_req->c, expn,
84 sizeof(expn) - obj_req->stream.avail_out);
85 } while (obj_req->stream.avail_in && obj_req->zret == Z_OK);
86 data_received++;
87 return size;
88 }
89
90 static void fetch_alternates(char *base);
91
92 static void process_object_response(void *callback_data);
93
94 static void start_object_request(struct object_request *obj_req)
95 {
96 char *hex = sha1_to_hex(obj_req->sha1);
97 char prevfile[PATH_MAX];
98 char *url;
99 char *posn;
100 int prevlocal;
101 unsigned char prev_buf[PREV_BUF_SIZE];
102 ssize_t prev_read = 0;
103 long prev_posn = 0;
104 char range[RANGE_HEADER_SIZE];
105 struct curl_slist *range_header = NULL;
106 struct active_request_slot *slot;
107
108 snprintf(prevfile, sizeof(prevfile), "%s.prev", obj_req->filename);
109 unlink(prevfile);
110 rename(obj_req->tmpfile, prevfile);
111 unlink(obj_req->tmpfile);
112
113 if (obj_req->local != -1)
114 error("fd leakage in start: %d", obj_req->local);
115 obj_req->local = open(obj_req->tmpfile,
116 O_WRONLY | O_CREAT | O_EXCL, 0666);
117 /* This could have failed due to the "lazy directory creation";
118 * try to mkdir the last path component.
119 */
120 if (obj_req->local < 0 && errno == ENOENT) {
121 char *dir = strrchr(obj_req->tmpfile, '/');
122 if (dir) {
123 *dir = 0;
124 mkdir(obj_req->tmpfile, 0777);
125 *dir = '/';
126 }
127 obj_req->local = open(obj_req->tmpfile,
128 O_WRONLY | O_CREAT | O_EXCL, 0666);
129 }
130
131 if (obj_req->local < 0) {
132 obj_req->state = ABORTED;
133 error("Couldn't create temporary file %s for %s: %s\n",
134 obj_req->tmpfile, obj_req->filename, strerror(errno));
135 return;
136 }
137
138 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
139
140 inflateInit(&obj_req->stream);
141
142 SHA1_Init(&obj_req->c);
143
144 url = xmalloc(strlen(obj_req->repo->base) + 50);
145 obj_req->url = xmalloc(strlen(obj_req->repo->base) + 50);
146 strcpy(url, obj_req->repo->base);
147 posn = url + strlen(obj_req->repo->base);
148 strcpy(posn, "objects/");
149 posn += 8;
150 memcpy(posn, hex, 2);
151 posn += 2;
152 *(posn++) = '/';
153 strcpy(posn, hex + 2);
154 strcpy(obj_req->url, url);
155
156 /* If a previous temp file is present, process what was already
157 fetched. */
158 prevlocal = open(prevfile, O_RDONLY);
159 if (prevlocal != -1) {
160 do {
161 prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
162 if (prev_read>0) {
163 if (fwrite_sha1_file(prev_buf,
164 1,
165 prev_read,
166 obj_req) == prev_read) {
167 prev_posn += prev_read;
168 } else {
169 prev_read = -1;
170 }
171 }
172 } while (prev_read > 0);
173 close(prevlocal);
174 }
175 unlink(prevfile);
176
177 /* Reset inflate/SHA1 if there was an error reading the previous temp
178 file; also rewind to the beginning of the local file. */
179 if (prev_read == -1) {
180 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
181 inflateInit(&obj_req->stream);
182 SHA1_Init(&obj_req->c);
183 if (prev_posn>0) {
184 prev_posn = 0;
185 lseek(obj_req->local, SEEK_SET, 0);
186 ftruncate(obj_req->local, 0);
187 }
188 }
189
190 slot = get_active_slot();
191 slot->callback_func = process_object_response;
192 slot->callback_data = obj_req;
193 obj_req->slot = slot;
194
195 curl_easy_setopt(slot->curl, CURLOPT_FILE, obj_req);
196 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
197 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, obj_req->errorstr);
198 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
199 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
200
201 /* If we have successfully processed data from a previous fetch
202 attempt, only fetch the data we don't already have. */
203 if (prev_posn>0) {
204 if (get_verbosely)
205 fprintf(stderr,
206 "Resuming fetch of object %s at byte %ld\n",
207 hex, prev_posn);
208 sprintf(range, "Range: bytes=%ld-", prev_posn);
209 range_header = curl_slist_append(range_header, range);
210 curl_easy_setopt(slot->curl,
211 CURLOPT_HTTPHEADER, range_header);
212 }
213
214 /* Try to get the request started, abort the request on error */
215 obj_req->state = ACTIVE;
216 if (!start_active_slot(slot)) {
217 obj_req->state = ABORTED;
218 obj_req->slot = NULL;
219 close(obj_req->local); obj_req->local = -1;
220 free(obj_req->url);
221 return;
222 }
223 }
224
225 static void finish_object_request(struct object_request *obj_req)
226 {
227 struct stat st;
228
229 fchmod(obj_req->local, 0444);
230 close(obj_req->local); obj_req->local = -1;
231
232 if (obj_req->http_code == 416) {
233 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
234 } else if (obj_req->curl_result != CURLE_OK) {
235 if (stat(obj_req->tmpfile, &st) == 0)
236 if (st.st_size == 0)
237 unlink(obj_req->tmpfile);
238 return;
239 }
240
241 inflateEnd(&obj_req->stream);
242 SHA1_Final(obj_req->real_sha1, &obj_req->c);
243 if (obj_req->zret != Z_STREAM_END) {
244 unlink(obj_req->tmpfile);
245 return;
246 }
247 if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
248 unlink(obj_req->tmpfile);
249 return;
250 }
251 obj_req->rename =
252 move_temp_to_file(obj_req->tmpfile, obj_req->filename);
253
254 if (obj_req->rename == 0)
255 pull_say("got %s\n", sha1_to_hex(obj_req->sha1));
256 }
257
258 static void process_object_response(void *callback_data)
259 {
260 struct object_request *obj_req =
261 (struct object_request *)callback_data;
262
263 obj_req->curl_result = obj_req->slot->curl_result;
264 obj_req->http_code = obj_req->slot->http_code;
265 obj_req->slot = NULL;
266 obj_req->state = COMPLETE;
267
268 /* Use alternates if necessary */
269 if (obj_req->http_code == 404 ||
270 obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE) {
271 fetch_alternates(alt->base);
272 if (obj_req->repo->next != NULL) {
273 obj_req->repo =
274 obj_req->repo->next;
275 close(obj_req->local);
276 obj_req->local = -1;
277 start_object_request(obj_req);
278 return;
279 }
280 }
281
282 finish_object_request(obj_req);
283 }
284
285 static void release_object_request(struct object_request *obj_req)
286 {
287 struct object_request *entry = object_queue_head;
288
289 if (obj_req->local != -1)
290 error("fd leakage in release: %d", obj_req->local);
291 if (obj_req == object_queue_head) {
292 object_queue_head = obj_req->next;
293 } else {
294 while (entry->next != NULL && entry->next != obj_req)
295 entry = entry->next;
296 if (entry->next == obj_req)
297 entry->next = entry->next->next;
298 }
299
300 free(obj_req->url);
301 free(obj_req);
302 }
303
304 #ifdef USE_CURL_MULTI
305 void fill_active_slots(void)
306 {
307 struct object_request *obj_req = object_queue_head;
308 struct active_request_slot *slot = active_queue_head;
309 int num_transfers;
310
311 while (active_requests < max_requests && obj_req != NULL) {
312 if (obj_req->state == WAITING) {
313 if (has_sha1_file(obj_req->sha1))
314 obj_req->state = COMPLETE;
315 else
316 start_object_request(obj_req);
317 curl_multi_perform(curlm, &num_transfers);
318 }
319 obj_req = obj_req->next;
320 }
321
322 while (slot != NULL) {
323 if (!slot->in_use && slot->curl != NULL) {
324 curl_easy_cleanup(slot->curl);
325 slot->curl = NULL;
326 }
327 slot = slot->next;
328 }
329 }
330 #endif
331
332 void prefetch(unsigned char *sha1)
333 {
334 struct object_request *newreq;
335 struct object_request *tail;
336 char *filename = sha1_file_name(sha1);
337
338 newreq = xmalloc(sizeof(*newreq));
339 memcpy(newreq->sha1, sha1, 20);
340 newreq->repo = alt;
341 newreq->url = NULL;
342 newreq->local = -1;
343 newreq->state = WAITING;
344 snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
345 snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
346 "%s.temp", filename);
347 newreq->next = NULL;
348
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;
355 }
356 tail->next = newreq;
357 }
358
359 #ifdef USE_CURL_MULTI
360 fill_active_slots();
361 step_active_slots();
362 #endif
363 }
364
365 static int fetch_index(struct alt_base *repo, unsigned char *sha1)
366 {
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
375 FILE *indexfile;
376 struct active_request_slot *slot;
377 struct slot_results results;
378
379 if (has_pack_index(sha1))
380 return 0;
381
382 if (get_verbosely)
383 fprintf(stderr, "Getting index for pack %s\n", hex);
384
385 url = xmalloc(strlen(repo->base) + 64);
386 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
387
388 filename = sha1_pack_index_name(sha1);
389 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
390 indexfile = fopen(tmpfile, "a");
391 if (!indexfile)
392 return error("Unable to open local file %s for pack index",
393 filename);
394
395 slot = get_active_slot();
396 slot->results = &results;
397 curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
398 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
399 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
400 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
401 slot->local = indexfile;
402
403 /* If there is data present from a previous transfer attempt,
404 resume where it left off */
405 prev_posn = ftell(indexfile);
406 if (prev_posn>0) {
407 if (get_verbosely)
408 fprintf(stderr,
409 "Resuming fetch of index for pack %s at byte %ld\n",
410 hex, prev_posn);
411 sprintf(range, "Range: bytes=%ld-", prev_posn);
412 range_header = curl_slist_append(range_header, range);
413 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
414 }
415
416 if (start_active_slot(slot)) {
417 run_active_slot(slot);
418 if (results.curl_result != CURLE_OK) {
419 fclose(indexfile);
420 return error("Unable to get pack index %s\n%s", url,
421 curl_errorstr);
422 }
423 } else {
424 fclose(indexfile);
425 return error("Unable to start request");
426 }
427
428 fclose(indexfile);
429
430 return move_temp_to_file(tmpfile, filename);
431 }
432
433 static int setup_index(struct alt_base *repo, unsigned char *sha1)
434 {
435 struct packed_git *new_pack;
436 if (has_pack_file(sha1))
437 return 0; // don't list this as something we can get
438
439 if (fetch_index(repo, sha1))
440 return -1;
441
442 new_pack = parse_pack_index(sha1);
443 new_pack->next = repo->packs;
444 repo->packs = new_pack;
445 return 0;
446 }
447
448 static void process_alternates_response(void *callback_data)
449 {
450 struct alternates_request *alt_req =
451 (struct alternates_request *)callback_data;
452 struct active_request_slot *slot = alt_req->slot;
453 struct alt_base *tail = alt;
454 char *base = alt_req->base;
455 static const char null_byte = '\0';
456 char *data;
457 int i = 0;
458
459 if (alt_req->http_specific) {
460 if (slot->curl_result != CURLE_OK ||
461 !alt_req->buffer->posn) {
462
463 /* Try reusing the slot to get non-http alternates */
464 alt_req->http_specific = 0;
465 sprintf(alt_req->url, "%s/objects/info/alternates",
466 base);
467 curl_easy_setopt(slot->curl, CURLOPT_URL,
468 alt_req->url);
469 active_requests++;
470 slot->in_use = 1;
471 if (start_active_slot(slot)) {
472 return;
473 } else {
474 got_alternates = -1;
475 slot->in_use = 0;
476 return;
477 }
478 }
479 } else if (slot->curl_result != CURLE_OK) {
480 if (slot->http_code != 404 &&
481 slot->curl_result != CURLE_FILE_COULDNT_READ_FILE) {
482 got_alternates = -1;
483 return;
484 }
485 }
486
487 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
488 alt_req->buffer->posn--;
489 data = alt_req->buffer->buffer;
490
491 while (i < alt_req->buffer->posn) {
492 int posn = i;
493 while (posn < alt_req->buffer->posn && data[posn] != '\n')
494 posn++;
495 if (data[posn] == '\n') {
496 int okay = 0;
497 int serverlen = 0;
498 struct alt_base *newalt;
499 char *target = NULL;
500 if (data[i] == '/') {
501 serverlen = strchr(base + 8, '/') - base;
502 okay = 1;
503 } else if (!memcmp(data + i, "../", 3)) {
504 i += 3;
505 serverlen = strlen(base);
506 while (i + 2 < posn &&
507 !memcmp(data + i, "../", 3)) {
508 do {
509 serverlen--;
510 } while (serverlen &&
511 base[serverlen - 1] != '/');
512 i += 3;
513 }
514 // If the server got removed, give up.
515 okay = strchr(base, ':') - base + 3 <
516 serverlen;
517 } else if (alt_req->http_specific) {
518 char *colon = strchr(data + i, ':');
519 char *slash = strchr(data + i, '/');
520 if (colon && slash && colon < data + posn &&
521 slash < data + posn && colon < slash) {
522 okay = 1;
523 }
524 }
525 // skip 'objects' at end
526 if (okay) {
527 target = xmalloc(serverlen + posn - i - 6);
528 strncpy(target, base, serverlen);
529 strncpy(target + serverlen, data + i,
530 posn - i - 7);
531 target[serverlen + posn - i - 7] = '\0';
532 if (get_verbosely)
533 fprintf(stderr,
534 "Also look at %s\n", target);
535 newalt = xmalloc(sizeof(*newalt));
536 newalt->next = NULL;
537 newalt->base = target;
538 newalt->got_indices = 0;
539 newalt->packs = NULL;
540 while (tail->next != NULL)
541 tail = tail->next;
542 tail->next = newalt;
543 }
544 }
545 i = posn + 1;
546 }
547
548 got_alternates = 1;
549 }
550
551 static void fetch_alternates(char *base)
552 {
553 struct buffer buffer;
554 char *url;
555 char *data;
556 struct active_request_slot *slot;
557 struct alternates_request alt_req;
558
559 /* If another request has already started fetching alternates,
560 wait for them to arrive and return to processing this request's
561 curl message */
562 #ifdef USE_CURL_MULTI
563 while (got_alternates == 0) {
564 step_active_slots();
565 }
566 #endif
567
568 /* Nothing to do if they've already been fetched */
569 if (got_alternates == 1)
570 return;
571
572 /* Start the fetch */
573 got_alternates = 0;
574
575 data = xmalloc(4096);
576 buffer.size = 4096;
577 buffer.posn = 0;
578 buffer.buffer = data;
579
580 if (get_verbosely)
581 fprintf(stderr, "Getting alternates list for %s\n", base);
582
583 url = xmalloc(strlen(base) + 31);
584 sprintf(url, "%s/objects/info/http-alternates", base);
585
586 /* Use a callback to process the result, since another request
587 may fail and need to have alternates loaded before continuing */
588 slot = get_active_slot();
589 slot->callback_func = process_alternates_response;
590 slot->callback_data = &alt_req;
591
592 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
593 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
594 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
595
596 alt_req.base = base;
597 alt_req.url = url;
598 alt_req.buffer = &buffer;
599 alt_req.http_specific = 1;
600 alt_req.slot = slot;
601
602 if (start_active_slot(slot))
603 run_active_slot(slot);
604 else
605 got_alternates = -1;
606
607 free(data);
608 free(url);
609 }
610
611 static int fetch_indices(struct alt_base *repo)
612 {
613 unsigned char sha1[20];
614 char *url;
615 struct buffer buffer;
616 char *data;
617 int i = 0;
618
619 struct active_request_slot *slot;
620 struct slot_results results;
621
622 if (repo->got_indices)
623 return 0;
624
625 data = xmalloc(4096);
626 buffer.size = 4096;
627 buffer.posn = 0;
628 buffer.buffer = data;
629
630 if (get_verbosely)
631 fprintf(stderr, "Getting pack list for %s\n", repo->base);
632
633 url = xmalloc(strlen(repo->base) + 21);
634 sprintf(url, "%s/objects/info/packs", repo->base);
635
636 slot = get_active_slot();
637 slot->results = &results;
638 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
639 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
640 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
641 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
642 if (start_active_slot(slot)) {
643 run_active_slot(slot);
644 if (results.curl_result != CURLE_OK) {
645 if (results.http_code == 404 ||
646 results.curl_result == CURLE_FILE_COULDNT_READ_FILE) {
647 repo->got_indices = 1;
648 free(buffer.buffer);
649 return 0;
650 } else {
651 repo->got_indices = 0;
652 free(buffer.buffer);
653 return error("%s", curl_errorstr);
654 }
655 }
656 } else {
657 repo->got_indices = 0;
658 free(buffer.buffer);
659 return error("Unable to start request");
660 }
661
662 data = buffer.buffer;
663 while (i < buffer.posn) {
664 switch (data[i]) {
665 case 'P':
666 i++;
667 if (i + 52 <= buffer.posn &&
668 !strncmp(data + i, " pack-", 6) &&
669 !strncmp(data + i + 46, ".pack\n", 6)) {
670 get_sha1_hex(data + i + 6, sha1);
671 setup_index(repo, sha1);
672 i += 51;
673 break;
674 }
675 default:
676 while (i < buffer.posn && data[i] != '\n')
677 i++;
678 }
679 i++;
680 }
681
682 free(buffer.buffer);
683 repo->got_indices = 1;
684 return 0;
685 }
686
687 static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
688 {
689 char *url;
690 struct packed_git *target;
691 struct packed_git **lst;
692 FILE *packfile;
693 char *filename;
694 char tmpfile[PATH_MAX];
695 int ret;
696 long prev_posn = 0;
697 char range[RANGE_HEADER_SIZE];
698 struct curl_slist *range_header = NULL;
699
700 struct active_request_slot *slot;
701 struct slot_results results;
702
703 if (fetch_indices(repo))
704 return -1;
705 target = find_sha1_pack(sha1, repo->packs);
706 if (!target)
707 return -1;
708
709 if (get_verbosely) {
710 fprintf(stderr, "Getting pack %s\n",
711 sha1_to_hex(target->sha1));
712 fprintf(stderr, " which contains %s\n",
713 sha1_to_hex(sha1));
714 }
715
716 url = xmalloc(strlen(repo->base) + 65);
717 sprintf(url, "%s/objects/pack/pack-%s.pack",
718 repo->base, sha1_to_hex(target->sha1));
719
720 filename = sha1_pack_name(target->sha1);
721 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
722 packfile = fopen(tmpfile, "a");
723 if (!packfile)
724 return error("Unable to open local file %s for pack",
725 filename);
726
727 slot = get_active_slot();
728 slot->results = &results;
729 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
730 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
731 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
732 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
733 slot->local = packfile;
734
735 /* If there is data present from a previous transfer attempt,
736 resume where it left off */
737 prev_posn = ftell(packfile);
738 if (prev_posn>0) {
739 if (get_verbosely)
740 fprintf(stderr,
741 "Resuming fetch of pack %s at byte %ld\n",
742 sha1_to_hex(target->sha1), prev_posn);
743 sprintf(range, "Range: bytes=%ld-", prev_posn);
744 range_header = curl_slist_append(range_header, range);
745 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
746 }
747
748 if (start_active_slot(slot)) {
749 run_active_slot(slot);
750 if (results.curl_result != CURLE_OK) {
751 fclose(packfile);
752 return error("Unable to get pack file %s\n%s", url,
753 curl_errorstr);
754 }
755 } else {
756 fclose(packfile);
757 return error("Unable to start request");
758 }
759
760 fclose(packfile);
761
762 ret = move_temp_to_file(tmpfile, filename);
763 if (ret)
764 return ret;
765
766 lst = &repo->packs;
767 while (*lst != target)
768 lst = &((*lst)->next);
769 *lst = (*lst)->next;
770
771 if (verify_pack(target, 0))
772 return -1;
773 install_packed_git(target);
774
775 return 0;
776 }
777
778 static int fetch_object(struct alt_base *repo, unsigned char *sha1)
779 {
780 char *hex = sha1_to_hex(sha1);
781 int ret = 0;
782 struct object_request *obj_req = object_queue_head;
783
784 while (obj_req != NULL && memcmp(obj_req->sha1, sha1, 20))
785 obj_req = obj_req->next;
786 if (obj_req == NULL)
787 return error("Couldn't find request for %s in the queue", hex);
788
789 if (has_sha1_file(obj_req->sha1)) {
790 release_object_request(obj_req);
791 return 0;
792 }
793
794 #ifdef USE_CURL_MULTI
795 while (obj_req->state == WAITING) {
796 step_active_slots();
797 }
798 #else
799 start_object_request(obj_req);
800 #endif
801
802 while (obj_req->state == ACTIVE) {
803 run_active_slot(obj_req->slot);
804 }
805 if (obj_req->local != -1) {
806 close(obj_req->local); obj_req->local = -1;
807 }
808
809 if (obj_req->state == ABORTED) {
810 ret = error("Request for %s aborted", hex);
811 } else if (obj_req->curl_result != CURLE_OK &&
812 obj_req->http_code != 416) {
813 if (obj_req->http_code == 404 ||
814 obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE)
815 ret = -1; /* Be silent, it is probably in a pack. */
816 else
817 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
818 obj_req->errorstr, obj_req->curl_result,
819 obj_req->http_code, hex);
820 } else if (obj_req->zret != Z_STREAM_END) {
821 ret = error("File %s (%s) corrupt\n", hex, obj_req->url);
822 } else if (memcmp(obj_req->sha1, obj_req->real_sha1, 20)) {
823 ret = error("File %s has bad hash\n", hex);
824 } else if (obj_req->rename < 0) {
825 ret = error("unable to write sha1 filename %s: %s",
826 obj_req->filename,
827 strerror(obj_req->rename));
828 }
829
830 release_object_request(obj_req);
831 return ret;
832 }
833
834 int fetch(unsigned char *sha1)
835 {
836 struct alt_base *altbase = alt;
837
838 if (!fetch_object(altbase, sha1))
839 return 0;
840 while (altbase) {
841 if (!fetch_pack(altbase, sha1))
842 return 0;
843 fetch_alternates(alt->base);
844 altbase = altbase->next;
845 }
846 return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
847 alt->base);
848 }
849
850 static inline int needs_quote(int ch)
851 {
852 switch (ch) {
853 case '/': case '-': case '.':
854 case 'A'...'Z': case 'a'...'z': case '0'...'9':
855 return 0;
856 default:
857 return 1;
858 }
859 }
860
861 static inline int hex(int v)
862 {
863 if (v < 10) return '0' + v;
864 else return 'A' + v - 10;
865 }
866
867 static char *quote_ref_url(const char *base, const char *ref)
868 {
869 const char *cp;
870 char *dp, *qref;
871 int len, baselen, ch;
872
873 baselen = strlen(base);
874 len = baselen + 6; /* "refs/" + NUL */
875 for (cp = ref; (ch = *cp) != 0; cp++, len++)
876 if (needs_quote(ch))
877 len += 2; /* extra two hex plus replacement % */
878 qref = xmalloc(len);
879 memcpy(qref, base, baselen);
880 memcpy(qref + baselen, "refs/", 5);
881 for (cp = ref, dp = qref + baselen + 5; (ch = *cp) != 0; cp++) {
882 if (needs_quote(ch)) {
883 *dp++ = '%';
884 *dp++ = hex((ch >> 4) & 0xF);
885 *dp++ = hex(ch & 0xF);
886 }
887 else
888 *dp++ = ch;
889 }
890 *dp = 0;
891
892 return qref;
893 }
894
895 int fetch_ref(char *ref, unsigned char *sha1)
896 {
897 char *url;
898 char hex[42];
899 struct buffer buffer;
900 char *base = alt->base;
901 struct active_request_slot *slot;
902 struct slot_results results;
903 buffer.size = 41;
904 buffer.posn = 0;
905 buffer.buffer = hex;
906 hex[41] = '\0';
907
908 url = quote_ref_url(base, ref);
909 slot = get_active_slot();
910 slot->results = &results;
911 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
912 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
913 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
914 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
915 if (start_active_slot(slot)) {
916 run_active_slot(slot);
917 if (results.curl_result != CURLE_OK)
918 return error("Couldn't get %s for %s\n%s",
919 url, ref, curl_errorstr);
920 } else {
921 return error("Unable to start request");
922 }
923
924 hex[40] = '\0';
925 get_sha1_hex(hex, sha1);
926 return 0;
927 }
928
929 int main(int argc, char **argv)
930 {
931 char *commit_id;
932 char *url;
933 int arg = 1;
934 int rc = 0;
935
936 setup_git_directory();
937
938 while (arg < argc && argv[arg][0] == '-') {
939 if (argv[arg][1] == 't') {
940 get_tree = 1;
941 } else if (argv[arg][1] == 'c') {
942 get_history = 1;
943 } else if (argv[arg][1] == 'a') {
944 get_all = 1;
945 get_tree = 1;
946 get_history = 1;
947 } else if (argv[arg][1] == 'v') {
948 get_verbosely = 1;
949 } else if (argv[arg][1] == 'w') {
950 write_ref = argv[arg + 1];
951 arg++;
952 } else if (!strcmp(argv[arg], "--recover")) {
953 get_recover = 1;
954 }
955 arg++;
956 }
957 if (argc < arg + 2) {
958 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
959 return 1;
960 }
961 commit_id = argv[arg];
962 url = argv[arg + 1];
963
964 http_init();
965
966 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
967
968 alt = xmalloc(sizeof(*alt));
969 alt->base = url;
970 alt->got_indices = 0;
971 alt->packs = NULL;
972 alt->next = NULL;
973
974 if (pull(commit_id))
975 rc = 1;
976
977 curl_slist_free_all(no_pragma_header);
978
979 http_cleanup();
980
981 return rc;
982 }