Merge branch 'rc/maint-http-local-slot-fix' into rc/http-push
[git/git.git] / http-walker.c
1 #include "cache.h"
2 #include "commit.h"
3 #include "pack.h"
4 #include "walker.h"
5 #include "http.h"
6
7 #define PREV_BUF_SIZE 4096
8 #define RANGE_HEADER_SIZE 30
9
10 struct alt_base
11 {
12 char *base;
13 int got_indices;
14 struct packed_git *packs;
15 struct alt_base *next;
16 };
17
18 enum object_request_state {
19 WAITING,
20 ABORTED,
21 ACTIVE,
22 COMPLETE,
23 };
24
25 struct object_request
26 {
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;
45 };
46
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;
54 };
55
56 struct walker_data {
57 const char *url;
58 int got_alternates;
59 struct alt_base *alt;
60 struct curl_slist *no_pragma_header;
61 };
62
63 static struct object_request *object_queue_head;
64
65 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
66 void *data)
67 {
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);
79
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;
91 }
92
93 static void fetch_alternates(struct walker *walker, const char *base);
94
95 static void process_object_response(void *callback_data);
96
97 static void start_object_request(struct walker *walker,
98 struct object_request *obj_req)
99 {
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;
112
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);
117
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.
124 */
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 = '/';
131 }
132 obj_req->local = open(obj_req->tmpfile,
133 O_WRONLY | O_CREAT | O_EXCL, 0666);
134 }
135
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;
141 }
142
143 memset(&obj_req->stream, 0, sizeof(obj_req->stream));
144
145 git_inflate_init(&obj_req->stream);
146
147 git_SHA1_Init(&obj_req->c);
148
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);
160
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,
169 1,
170 prev_read,
171 obj_req) == prev_read) {
172 prev_posn += prev_read;
173 } else {
174 prev_read = -1;
175 }
176 }
177 } while (prev_read > 0);
178 close(prevlocal);
179 }
180 unlink_or_warn(prevfile);
181
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);
192 }
193 }
194
195 slot = get_active_slot();
196 slot->callback_func = process_object_response;
197 slot->callback_data = obj_req;
198 obj_req->slot = slot;
199
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);
205
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);
217 }
218
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;
227 }
228 }
229
230 static void finish_object_request(struct object_request *obj_req)
231 {
232 struct stat st;
233
234 close(obj_req->local); obj_req->local = -1;
235
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;
243 }
244
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;
250 }
251 if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
252 unlink_or_warn(obj_req->tmpfile);
253 return;
254 }
255 obj_req->rename =
256 move_temp_to_file(obj_req->tmpfile, obj_req->filename);
257
258 if (obj_req->rename == 0)
259 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
260 }
261
262 static void process_object_response(void *callback_data)
263 {
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;
269
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;
274
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;
285 }
286 }
287
288 finish_object_request(obj_req);
289 }
290
291 static void release_object_request(struct object_request *obj_req)
292 {
293 struct object_request *entry = object_queue_head;
294
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;
304 }
305
306 free(obj_req->url);
307 free(obj_req);
308 }
309
310 #ifdef USE_CURL_MULTI
311 static int fill_active_slot(struct walker *walker)
312 {
313 struct object_request *obj_req;
314
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;
322 }
323 }
324 }
325 return 0;
326 }
327 #endif
328
329 static void prefetch(struct walker *walker, unsigned char *sha1)
330 {
331 struct object_request *newreq;
332 struct object_request *tail;
333 struct walker_data *data = walker->data;
334 char *filename = sha1_file_name(sha1);
335
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;
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 walker *walker, 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 struct walker_data *data = walker->data;
375
376 FILE *indexfile;
377 struct active_request_slot *slot;
378 struct slot_results results;
379
380 if (has_pack_index(sha1))
381 return 0;
382
383 if (walker->get_verbosely)
384 fprintf(stderr, "Getting index for pack %s\n", hex);
385
386 url = xmalloc(strlen(repo->base) + 64);
387 sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
388
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);
395
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;
403
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);
415 }
416
417 if (start_active_slot(slot)) {
418 run_active_slot(slot);
419 if (results.curl_result != CURLE_OK) {
420 fclose(indexfile);
421 slot->local = NULL;
422 return error("Unable to get pack index %s\n%s", url,
423 curl_errorstr);
424 }
425 } else {
426 fclose(indexfile);
427 slot->local = NULL;
428 return error("Unable to start request");
429 }
430
431 fclose(indexfile);
432 slot->local = NULL;
433
434 return move_temp_to_file(tmpfile, filename);
435 }
436
437 static int setup_index(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
438 {
439 struct packed_git *new_pack;
440 if (has_pack_file(sha1))
441 return 0; /* don't list this as something we can get */
442
443 if (fetch_index(walker, repo, sha1))
444 return -1;
445
446 new_pack = parse_pack_index(sha1);
447 if (!new_pack)
448 return -1; /* parse_pack_index() already issued error message */
449 new_pack->next = repo->packs;
450 repo->packs = new_pack;
451 return 0;
452 }
453
454 static void process_alternates_response(void *callback_data)
455 {
456 struct alternates_request *alt_req =
457 (struct alternates_request *)callback_data;
458 struct walker *walker = alt_req->walker;
459 struct walker_data *cdata = walker->data;
460 struct active_request_slot *slot = alt_req->slot;
461 struct alt_base *tail = cdata->alt;
462 const char *base = alt_req->base;
463 static const char null_byte = '\0';
464 char *data;
465 int i = 0;
466
467 if (alt_req->http_specific) {
468 if (slot->curl_result != CURLE_OK ||
469 !alt_req->buffer->len) {
470
471 /* Try reusing the slot to get non-http alternates */
472 alt_req->http_specific = 0;
473 sprintf(alt_req->url, "%s/objects/info/alternates",
474 base);
475 curl_easy_setopt(slot->curl, CURLOPT_URL,
476 alt_req->url);
477 active_requests++;
478 slot->in_use = 1;
479 if (slot->finished != NULL)
480 (*slot->finished) = 0;
481 if (!start_active_slot(slot)) {
482 cdata->got_alternates = -1;
483 slot->in_use = 0;
484 if (slot->finished != NULL)
485 (*slot->finished) = 1;
486 }
487 return;
488 }
489 } else if (slot->curl_result != CURLE_OK) {
490 if (!missing_target(slot)) {
491 cdata->got_alternates = -1;
492 return;
493 }
494 }
495
496 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
497 alt_req->buffer->len--;
498 data = alt_req->buffer->buf;
499
500 while (i < alt_req->buffer->len) {
501 int posn = i;
502 while (posn < alt_req->buffer->len && data[posn] != '\n')
503 posn++;
504 if (data[posn] == '\n') {
505 int okay = 0;
506 int serverlen = 0;
507 struct alt_base *newalt;
508 char *target = NULL;
509 if (data[i] == '/') {
510 /* This counts
511 * http://git.host/pub/scm/linux.git/
512 * -----------here^
513 * so memcpy(dst, base, serverlen) will
514 * copy up to "...git.host".
515 */
516 const char *colon_ss = strstr(base,"://");
517 if (colon_ss) {
518 serverlen = (strchr(colon_ss + 3, '/')
519 - base);
520 okay = 1;
521 }
522 } else if (!memcmp(data + i, "../", 3)) {
523 /* Relative URL; chop the corresponding
524 * number of subpath from base (and ../
525 * from data), and concatenate the result.
526 *
527 * The code first drops ../ from data, and
528 * then drops one ../ from data and one path
529 * from base. IOW, one extra ../ is dropped
530 * from data than path is dropped from base.
531 *
532 * This is not wrong. The alternate in
533 * http://git.host/pub/scm/linux.git/
534 * to borrow from
535 * http://git.host/pub/scm/linus.git/
536 * is ../../linus.git/objects/. You need
537 * two ../../ to borrow from your direct
538 * neighbour.
539 */
540 i += 3;
541 serverlen = strlen(base);
542 while (i + 2 < posn &&
543 !memcmp(data + i, "../", 3)) {
544 do {
545 serverlen--;
546 } while (serverlen &&
547 base[serverlen - 1] != '/');
548 i += 3;
549 }
550 /* If the server got removed, give up. */
551 okay = strchr(base, ':') - base + 3 <
552 serverlen;
553 } else if (alt_req->http_specific) {
554 char *colon = strchr(data + i, ':');
555 char *slash = strchr(data + i, '/');
556 if (colon && slash && colon < data + posn &&
557 slash < data + posn && colon < slash) {
558 okay = 1;
559 }
560 }
561 /* skip "objects\n" at end */
562 if (okay) {
563 target = xmalloc(serverlen + posn - i - 6);
564 memcpy(target, base, serverlen);
565 memcpy(target + serverlen, data + i,
566 posn - i - 7);
567 target[serverlen + posn - i - 7] = 0;
568 if (walker->get_verbosely)
569 fprintf(stderr,
570 "Also look at %s\n", target);
571 newalt = xmalloc(sizeof(*newalt));
572 newalt->next = NULL;
573 newalt->base = target;
574 newalt->got_indices = 0;
575 newalt->packs = NULL;
576
577 while (tail->next != NULL)
578 tail = tail->next;
579 tail->next = newalt;
580 }
581 }
582 i = posn + 1;
583 }
584
585 cdata->got_alternates = 1;
586 }
587
588 static void fetch_alternates(struct walker *walker, const char *base)
589 {
590 struct strbuf buffer = STRBUF_INIT;
591 char *url;
592 struct active_request_slot *slot;
593 struct alternates_request alt_req;
594 struct walker_data *cdata = walker->data;
595
596 /* If another request has already started fetching alternates,
597 wait for them to arrive and return to processing this request's
598 curl message */
599 #ifdef USE_CURL_MULTI
600 while (cdata->got_alternates == 0) {
601 step_active_slots();
602 }
603 #endif
604
605 /* Nothing to do if they've already been fetched */
606 if (cdata->got_alternates == 1)
607 return;
608
609 /* Start the fetch */
610 cdata->got_alternates = 0;
611
612 if (walker->get_verbosely)
613 fprintf(stderr, "Getting alternates list for %s\n", base);
614
615 url = xmalloc(strlen(base) + 31);
616 sprintf(url, "%s/objects/info/http-alternates", base);
617
618 /* Use a callback to process the result, since another request
619 may fail and need to have alternates loaded before continuing */
620 slot = get_active_slot();
621 slot->callback_func = process_alternates_response;
622 alt_req.walker = walker;
623 slot->callback_data = &alt_req;
624
625 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
626 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
627 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
628
629 alt_req.base = base;
630 alt_req.url = url;
631 alt_req.buffer = &buffer;
632 alt_req.http_specific = 1;
633 alt_req.slot = slot;
634
635 if (start_active_slot(slot))
636 run_active_slot(slot);
637 else
638 cdata->got_alternates = -1;
639
640 strbuf_release(&buffer);
641 free(url);
642 }
643
644 static int fetch_indices(struct walker *walker, struct alt_base *repo)
645 {
646 unsigned char sha1[20];
647 char *url;
648 struct strbuf buffer = STRBUF_INIT;
649 char *data;
650 int i = 0;
651 int ret = 0;
652
653 struct active_request_slot *slot;
654 struct slot_results results;
655
656 if (repo->got_indices)
657 return 0;
658
659 if (walker->get_verbosely)
660 fprintf(stderr, "Getting pack list for %s\n", repo->base);
661
662 url = xmalloc(strlen(repo->base) + 21);
663 sprintf(url, "%s/objects/info/packs", repo->base);
664
665 slot = get_active_slot();
666 slot->results = &results;
667 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
668 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
669 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
670 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
671 if (start_active_slot(slot)) {
672 run_active_slot(slot);
673 if (results.curl_result != CURLE_OK) {
674 if (missing_target(&results)) {
675 repo->got_indices = 1;
676 goto cleanup;
677 } else {
678 repo->got_indices = 0;
679 ret = error("%s", curl_errorstr);
680 goto cleanup;
681 }
682 }
683 } else {
684 repo->got_indices = 0;
685 ret = error("Unable to start request");
686 goto cleanup;
687 }
688
689 data = buffer.buf;
690 while (i < buffer.len) {
691 switch (data[i]) {
692 case 'P':
693 i++;
694 if (i + 52 <= buffer.len &&
695 !prefixcmp(data + i, " pack-") &&
696 !prefixcmp(data + i + 46, ".pack\n")) {
697 get_sha1_hex(data + i + 6, sha1);
698 setup_index(walker, repo, sha1);
699 i += 51;
700 break;
701 }
702 default:
703 while (i < buffer.len && data[i] != '\n')
704 i++;
705 }
706 i++;
707 }
708
709 repo->got_indices = 1;
710 cleanup:
711 strbuf_release(&buffer);
712 free(url);
713 return ret;
714 }
715
716 static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
717 {
718 char *url;
719 struct packed_git *target;
720 struct packed_git **lst;
721 FILE *packfile;
722 char *filename;
723 char tmpfile[PATH_MAX];
724 int ret;
725 long prev_posn = 0;
726 char range[RANGE_HEADER_SIZE];
727 struct curl_slist *range_header = NULL;
728 struct walker_data *data = walker->data;
729
730 struct active_request_slot *slot;
731 struct slot_results results;
732
733 if (fetch_indices(walker, repo))
734 return -1;
735 target = find_sha1_pack(sha1, repo->packs);
736 if (!target)
737 return -1;
738
739 if (walker->get_verbosely) {
740 fprintf(stderr, "Getting pack %s\n",
741 sha1_to_hex(target->sha1));
742 fprintf(stderr, " which contains %s\n",
743 sha1_to_hex(sha1));
744 }
745
746 url = xmalloc(strlen(repo->base) + 65);
747 sprintf(url, "%s/objects/pack/pack-%s.pack",
748 repo->base, sha1_to_hex(target->sha1));
749
750 filename = sha1_pack_name(target->sha1);
751 snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
752 packfile = fopen(tmpfile, "a");
753 if (!packfile)
754 return error("Unable to open local file %s for pack",
755 tmpfile);
756
757 slot = get_active_slot();
758 slot->results = &results;
759 curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
760 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
761 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
762 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, data->no_pragma_header);
763 slot->local = packfile;
764
765 /* If there is data present from a previous transfer attempt,
766 resume where it left off */
767 prev_posn = ftell(packfile);
768 if (prev_posn>0) {
769 if (walker->get_verbosely)
770 fprintf(stderr,
771 "Resuming fetch of pack %s at byte %ld\n",
772 sha1_to_hex(target->sha1), prev_posn);
773 sprintf(range, "Range: bytes=%ld-", prev_posn);
774 range_header = curl_slist_append(range_header, range);
775 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
776 }
777
778 if (start_active_slot(slot)) {
779 run_active_slot(slot);
780 if (results.curl_result != CURLE_OK) {
781 fclose(packfile);
782 slot->local = NULL;
783 return error("Unable to get pack file %s\n%s", url,
784 curl_errorstr);
785 }
786 } else {
787 fclose(packfile);
788 slot->local = NULL;
789 return error("Unable to start request");
790 }
791
792 target->pack_size = ftell(packfile);
793 fclose(packfile);
794 slot->local = NULL;
795
796 ret = move_temp_to_file(tmpfile, filename);
797 if (ret)
798 return ret;
799
800 lst = &repo->packs;
801 while (*lst != target)
802 lst = &((*lst)->next);
803 *lst = (*lst)->next;
804
805 if (verify_pack(target))
806 return -1;
807 install_packed_git(target);
808
809 return 0;
810 }
811
812 static void abort_object_request(struct object_request *obj_req)
813 {
814 if (obj_req->local >= 0) {
815 close(obj_req->local);
816 obj_req->local = -1;
817 }
818 unlink_or_warn(obj_req->tmpfile);
819 if (obj_req->slot) {
820 release_active_slot(obj_req->slot);
821 obj_req->slot = NULL;
822 }
823 release_object_request(obj_req);
824 }
825
826 static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
827 {
828 char *hex = sha1_to_hex(sha1);
829 int ret = 0;
830 struct object_request *obj_req = object_queue_head;
831
832 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
833 obj_req = obj_req->next;
834 if (obj_req == NULL)
835 return error("Couldn't find request for %s in the queue", hex);
836
837 if (has_sha1_file(obj_req->sha1)) {
838 abort_object_request(obj_req);
839 return 0;
840 }
841
842 #ifdef USE_CURL_MULTI
843 while (obj_req->state == WAITING) {
844 step_active_slots();
845 }
846 #else
847 start_object_request(walker, obj_req);
848 #endif
849
850 while (obj_req->state == ACTIVE) {
851 run_active_slot(obj_req->slot);
852 }
853 if (obj_req->local != -1) {
854 close(obj_req->local); obj_req->local = -1;
855 }
856
857 if (obj_req->state == ABORTED) {
858 ret = error("Request for %s aborted", hex);
859 } else if (obj_req->curl_result != CURLE_OK &&
860 obj_req->http_code != 416) {
861 if (missing_target(obj_req))
862 ret = -1; /* Be silent, it is probably in a pack. */
863 else
864 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
865 obj_req->errorstr, obj_req->curl_result,
866 obj_req->http_code, hex);
867 } else if (obj_req->zret != Z_STREAM_END) {
868 walker->corrupt_object_found++;
869 ret = error("File %s (%s) corrupt", hex, obj_req->url);
870 } else if (hashcmp(obj_req->sha1, obj_req->real_sha1)) {
871 ret = error("File %s has bad hash", hex);
872 } else if (obj_req->rename < 0) {
873 ret = error("unable to write sha1 filename %s",
874 obj_req->filename);
875 }
876
877 release_object_request(obj_req);
878 return ret;
879 }
880
881 static int fetch(struct walker *walker, unsigned char *sha1)
882 {
883 struct walker_data *data = walker->data;
884 struct alt_base *altbase = data->alt;
885
886 if (!fetch_object(walker, altbase, sha1))
887 return 0;
888 while (altbase) {
889 if (!fetch_pack(walker, altbase, sha1))
890 return 0;
891 fetch_alternates(walker, data->alt->base);
892 altbase = altbase->next;
893 }
894 return error("Unable to find %s under %s", sha1_to_hex(sha1),
895 data->alt->base);
896 }
897
898 static int fetch_ref(struct walker *walker, struct ref *ref)
899 {
900 struct walker_data *data = walker->data;
901 return http_fetch_ref(data->alt->base, ref);
902 }
903
904 static void cleanup(struct walker *walker)
905 {
906 struct walker_data *data = walker->data;
907 http_cleanup();
908
909 curl_slist_free_all(data->no_pragma_header);
910 }
911
912 struct walker *get_http_walker(const char *url, struct remote *remote)
913 {
914 char *s;
915 struct walker_data *data = xmalloc(sizeof(struct walker_data));
916 struct walker *walker = xmalloc(sizeof(struct walker));
917
918 http_init(remote);
919
920 data->no_pragma_header = curl_slist_append(NULL, "Pragma:");
921
922 data->alt = xmalloc(sizeof(*data->alt));
923 data->alt->base = xmalloc(strlen(url) + 1);
924 strcpy(data->alt->base, url);
925 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
926 *s = 0;
927
928 data->alt->got_indices = 0;
929 data->alt->packs = NULL;
930 data->alt->next = NULL;
931 data->got_alternates = -1;
932
933 walker->corrupt_object_found = 0;
934 walker->fetch = fetch;
935 walker->fetch_ref = fetch_ref;
936 walker->prefetch = prefetch;
937 walker->cleanup = cleanup;
938 walker->data = data;
939
940 #ifdef USE_CURL_MULTI
941 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
942 #endif
943
944 return walker;
945 }