standardize brace placement in struct definitions
[git/git.git] / http-walker.c
CommitLineData
6eb7ed54
DB
1#include "cache.h"
2#include "commit.h"
30ae764b 3#include "walker.h"
29508e1e 4#include "http.h"
7baa3e86 5
9cba13ca 6struct alt_base {
2afea3bc 7 char *base;
b3661567
DB
8 int got_indices;
9 struct packed_git *packs;
10 struct alt_base *next;
11};
12
e388ab74 13enum object_request_state {
1d389ab6
NH
14 WAITING,
15 ABORTED,
16 ACTIVE,
4b05548f 17 COMPLETE
1d389ab6 18};
6eb7ed54 19
9cba13ca 20struct object_request {
30ae764b 21 struct walker *walker;
1d389ab6
NH
22 unsigned char sha1[20];
23 struct alt_base *repo;
e388ab74 24 enum object_request_state state;
5424bc55 25 struct http_object_request *req;
e388ab74 26 struct object_request *next;
1d389ab6
NH
27};
28
e388ab74 29struct alternates_request {
30ae764b 30 struct walker *walker;
8e29f6a0 31 const char *base;
acc075a8 32 char *url;
028c2976 33 struct strbuf *buffer;
acc075a8
NH
34 struct active_request_slot *slot;
35 int http_specific;
36};
37
30ae764b
DB
38struct walker_data {
39 const char *url;
40 int got_alternates;
41 struct alt_base *alt;
30ae764b
DB
42};
43
96f1e58f 44static struct object_request *object_queue_head;
bc8f2652 45
30ae764b 46static void fetch_alternates(struct walker *walker, const char *base);
1d389ab6 47
29508e1e 48static void process_object_response(void *callback_data);
1d389ab6 49
30ae764b
DB
50static void start_object_request(struct walker *walker,
51 struct object_request *obj_req)
1d389ab6 52{
1d389ab6 53 struct active_request_slot *slot;
5424bc55 54 struct http_object_request *req;
1d389ab6 55
5424bc55
TRC
56 req = new_http_object_request(obj_req->repo->base, obj_req->sha1);
57 if (req == NULL) {
e388ab74 58 obj_req->state = ABORTED;
1d389ab6
NH
59 return;
60 }
5424bc55 61 obj_req->req = req;
1d389ab6 62
5424bc55 63 slot = req->slot;
29508e1e 64 slot->callback_func = process_object_response;
e388ab74 65 slot->callback_data = obj_req;
1d389ab6 66
a7a8d378 67 /* Try to get the request started, abort the request on error */
e388ab74 68 obj_req->state = ACTIVE;
1d389ab6 69 if (!start_active_slot(slot)) {
e388ab74 70 obj_req->state = ABORTED;
5424bc55 71 release_http_object_request(req);
e388ab74 72 return;
1d389ab6 73 }
1d389ab6
NH
74}
75
e388ab74 76static void finish_object_request(struct object_request *obj_req)
1d389ab6 77{
5424bc55 78 if (finish_http_object_request(obj_req->req))
1d389ab6 79 return;
1d389ab6 80
5424bc55 81 if (obj_req->req->rename == 0)
30ae764b 82 walker_say(obj_req->walker, "got %s\n", sha1_to_hex(obj_req->sha1));
1d389ab6
NH
83}
84
29508e1e
NH
85static void process_object_response(void *callback_data)
86{
e388ab74
NH
87 struct object_request *obj_req =
88 (struct object_request *)callback_data;
30ae764b
DB
89 struct walker *walker = obj_req->walker;
90 struct walker_data *data = walker->data;
91 struct alt_base *alt = data->alt;
29508e1e 92
5424bc55 93 process_http_object_request(obj_req->req);
e388ab74 94 obj_req->state = COMPLETE;
29508e1e
NH
95
96 /* Use alternates if necessary */
5424bc55 97 if (missing_target(obj_req->req)) {
30ae764b 98 fetch_alternates(walker, alt->base);
e388ab74
NH
99 if (obj_req->repo->next != NULL) {
100 obj_req->repo =
101 obj_req->repo->next;
5424bc55 102 release_http_object_request(obj_req->req);
30ae764b 103 start_object_request(walker, obj_req);
29508e1e
NH
104 return;
105 }
106 }
107
e388ab74 108 finish_object_request(obj_req);
29508e1e
NH
109}
110
e388ab74 111static void release_object_request(struct object_request *obj_req)
1d389ab6 112{
e388ab74 113 struct object_request *entry = object_queue_head;
1d389ab6 114
5424bc55
TRC
115 if (obj_req->req !=NULL && obj_req->req->localfile != -1)
116 error("fd leakage in release: %d", obj_req->req->localfile);
e388ab74
NH
117 if (obj_req == object_queue_head) {
118 object_queue_head = obj_req->next;
1d389ab6 119 } else {
e388ab74 120 while (entry->next != NULL && entry->next != obj_req)
1d389ab6 121 entry = entry->next;
e388ab74 122 if (entry->next == obj_req)
1d389ab6
NH
123 entry->next = entry->next->next;
124 }
125
e388ab74 126 free(obj_req);
1d389ab6
NH
127}
128
a7a8d378 129#ifdef USE_CURL_MULTI
30ae764b 130static int fill_active_slot(struct walker *walker)
1d389ab6 131{
45c17412 132 struct object_request *obj_req;
1d389ab6 133
45c17412 134 for (obj_req = object_queue_head; obj_req; obj_req = obj_req->next) {
e388ab74
NH
135 if (obj_req->state == WAITING) {
136 if (has_sha1_file(obj_req->sha1))
09db444f 137 obj_req->state = COMPLETE;
45c17412 138 else {
30ae764b 139 start_object_request(walker, obj_req);
45c17412
DB
140 return 1;
141 }
f1a906a3 142 }
8fcf7f9a 143 }
45c17412 144 return 0;
1d389ab6 145}
a7a8d378 146#endif
1d389ab6 147
30ae764b 148static void prefetch(struct walker *walker, unsigned char *sha1)
1d389ab6 149{
e388ab74
NH
150 struct object_request *newreq;
151 struct object_request *tail;
30ae764b 152 struct walker_data *data = walker->data;
1d389ab6
NH
153
154 newreq = xmalloc(sizeof(*newreq));
30ae764b 155 newreq->walker = walker;
e702496e 156 hashcpy(newreq->sha1, sha1);
30ae764b 157 newreq->repo = data->alt;
1d389ab6 158 newreq->state = WAITING;
5424bc55 159 newreq->req = NULL;
1d389ab6
NH
160 newreq->next = NULL;
161
e9176745
TRC
162 http_is_verbose = walker->get_verbosely;
163
e388ab74
NH
164 if (object_queue_head == NULL) {
165 object_queue_head = newreq;
1d389ab6 166 } else {
e388ab74 167 tail = object_queue_head;
4c42aa1a 168 while (tail->next != NULL)
1d389ab6 169 tail = tail->next;
1d389ab6
NH
170 tail->next = newreq;
171 }
29508e1e 172
a7a8d378 173#ifdef USE_CURL_MULTI
29508e1e
NH
174 fill_active_slots();
175 step_active_slots();
a7a8d378 176#endif
1d389ab6
NH
177}
178
e388ab74 179static void process_alternates_response(void *callback_data)
b3661567 180{
e388ab74
NH
181 struct alternates_request *alt_req =
182 (struct alternates_request *)callback_data;
30ae764b
DB
183 struct walker *walker = alt_req->walker;
184 struct walker_data *cdata = walker->data;
acc075a8 185 struct active_request_slot *slot = alt_req->slot;
30ae764b 186 struct alt_base *tail = cdata->alt;
8e29f6a0 187 const char *base = alt_req->base;
bc8f2652 188 static const char null_byte = '\0';
acc075a8
NH
189 char *data;
190 int i = 0;
1d389ab6 191
acc075a8
NH
192 if (alt_req->http_specific) {
193 if (slot->curl_result != CURLE_OK ||
028c2976 194 !alt_req->buffer->len) {
acc075a8
NH
195
196 /* Try reusing the slot to get non-http alternates */
197 alt_req->http_specific = 0;
198 sprintf(alt_req->url, "%s/objects/info/alternates",
199 base);
200 curl_easy_setopt(slot->curl, CURLOPT_URL,
201 alt_req->url);
202 active_requests++;
203 slot->in_use = 1;
c9826473
NH
204 if (slot->finished != NULL)
205 (*slot->finished) = 0;
a3f583cb 206 if (!start_active_slot(slot)) {
30ae764b 207 cdata->got_alternates = -1;
29508e1e 208 slot->in_use = 0;
c9826473
NH
209 if (slot->finished != NULL)
210 (*slot->finished) = 1;
1d389ab6 211 }
a3f583cb 212 return;
b3661567 213 }
acc075a8 214 } else if (slot->curl_result != CURLE_OK) {
be4a015b 215 if (!missing_target(slot)) {
30ae764b 216 cdata->got_alternates = -1;
acc075a8
NH
217 return;
218 }
b3661567
DB
219 }
220
29508e1e 221 fwrite_buffer(&null_byte, 1, 1, alt_req->buffer);
028c2976
MH
222 alt_req->buffer->len--;
223 data = alt_req->buffer->buf;
1b0c1e67 224
028c2976 225 while (i < alt_req->buffer->len) {
b3661567 226 int posn = i;
028c2976 227 while (posn < alt_req->buffer->len && data[posn] != '\n')
b3661567
DB
228 posn++;
229 if (data[posn] == '\n') {
1b0c1e67
DB
230 int okay = 0;
231 int serverlen = 0;
232 struct alt_base *newalt;
233 char *target = NULL;
b3661567 234 if (data[i] == '/') {
4c42aa1a
TRC
235 /*
236 * This counts
5df1e0d0
JH
237 * http://git.host/pub/scm/linux.git/
238 * -----------here^
239 * so memcpy(dst, base, serverlen) will
240 * copy up to "...git.host".
241 */
242 const char *colon_ss = strstr(base,"://");
243 if (colon_ss) {
244 serverlen = (strchr(colon_ss + 3, '/')
245 - base);
246 okay = 1;
247 }
1b0c1e67 248 } else if (!memcmp(data + i, "../", 3)) {
4c42aa1a
TRC
249 /*
250 * Relative URL; chop the corresponding
5df1e0d0
JH
251 * number of subpath from base (and ../
252 * from data), and concatenate the result.
253 *
254 * The code first drops ../ from data, and
255 * then drops one ../ from data and one path
256 * from base. IOW, one extra ../ is dropped
257 * from data than path is dropped from base.
258 *
259 * This is not wrong. The alternate in
260 * http://git.host/pub/scm/linux.git/
261 * to borrow from
262 * http://git.host/pub/scm/linus.git/
263 * is ../../linus.git/objects/. You need
264 * two ../../ to borrow from your direct
265 * neighbour.
266 */
1b0c1e67
DB
267 i += 3;
268 serverlen = strlen(base);
8fcf7f9a 269 while (i + 2 < posn &&
1b0c1e67
DB
270 !memcmp(data + i, "../", 3)) {
271 do {
272 serverlen--;
273 } while (serverlen &&
274 base[serverlen - 1] != '/');
275 i += 3;
276 }
a9486b02 277 /* If the server got removed, give up. */
8fcf7f9a 278 okay = strchr(base, ':') - base + 3 <
4c42aa1a 279 serverlen;
acc075a8 280 } else if (alt_req->http_specific) {
1b0c1e67
DB
281 char *colon = strchr(data + i, ':');
282 char *slash = strchr(data + i, '/');
283 if (colon && slash && colon < data + posn &&
284 slash < data + posn && colon < slash) {
285 okay = 1;
286 }
287 }
5df1e0d0 288 /* skip "objects\n" at end */
1b0c1e67
DB
289 if (okay) {
290 target = xmalloc(serverlen + posn - i - 6);
5df1e0d0
JH
291 memcpy(target, base, serverlen);
292 memcpy(target + serverlen, data + i,
293 posn - i - 7);
294 target[serverlen + posn - i - 7] = 0;
30ae764b 295 if (walker->get_verbosely)
8fcf7f9a 296 fprintf(stderr,
b3661567
DB
297 "Also look at %s\n", target);
298 newalt = xmalloc(sizeof(*newalt));
1d389ab6 299 newalt->next = NULL;
b3661567
DB
300 newalt->base = target;
301 newalt->got_indices = 0;
302 newalt->packs = NULL;
8d9fbe57 303
1d389ab6
NH
304 while (tail->next != NULL)
305 tail = tail->next;
306 tail->next = newalt;
b3661567
DB
307 }
308 }
309 i = posn + 1;
310 }
bc8f2652 311
30ae764b 312 cdata->got_alternates = 1;
acc075a8
NH
313}
314
30ae764b 315static void fetch_alternates(struct walker *walker, const char *base)
acc075a8 316{
028c2976 317 struct strbuf buffer = STRBUF_INIT;
acc075a8 318 char *url;
acc075a8 319 struct active_request_slot *slot;
cb754fdf 320 struct alternates_request alt_req;
30ae764b 321 struct walker_data *cdata = walker->data;
acc075a8 322
4c42aa1a
TRC
323 /*
324 * If another request has already started fetching alternates,
325 * wait for them to arrive and return to processing this request's
326 * curl message
327 */
29508e1e 328#ifdef USE_CURL_MULTI
30ae764b 329 while (cdata->got_alternates == 0) {
29508e1e 330 step_active_slots();
acc075a8 331 }
29508e1e 332#endif
acc075a8
NH
333
334 /* Nothing to do if they've already been fetched */
30ae764b 335 if (cdata->got_alternates == 1)
acc075a8
NH
336 return;
337
338 /* Start the fetch */
30ae764b 339 cdata->got_alternates = 0;
acc075a8 340
30ae764b 341 if (walker->get_verbosely)
acc075a8 342 fprintf(stderr, "Getting alternates list for %s\n", base);
8fcf7f9a 343
acc075a8
NH
344 url = xmalloc(strlen(base) + 31);
345 sprintf(url, "%s/objects/info/http-alternates", base);
346
4c42aa1a
TRC
347 /*
348 * Use a callback to process the result, since another request
349 * may fail and need to have alternates loaded before continuing
350 */
acc075a8 351 slot = get_active_slot();
e388ab74 352 slot->callback_func = process_alternates_response;
30ae764b 353 alt_req.walker = walker;
acc075a8
NH
354 slot->callback_data = &alt_req;
355
356 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 357 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
acc075a8
NH
358 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
359
360 alt_req.base = base;
361 alt_req.url = url;
362 alt_req.buffer = &buffer;
363 alt_req.http_specific = 1;
364 alt_req.slot = slot;
365
366 if (start_active_slot(slot))
367 run_active_slot(slot);
368 else
30ae764b 369 cdata->got_alternates = -1;
acc075a8 370
028c2976 371 strbuf_release(&buffer);
acc075a8 372 free(url);
b3661567
DB
373}
374
30ae764b 375static int fetch_indices(struct walker *walker, struct alt_base *repo)
182005b9 376{
b8caac2b 377 int ret;
1d389ab6 378
b3661567 379 if (repo->got_indices)
182005b9
DB
380 return 0;
381
30ae764b 382 if (walker->get_verbosely)
6fd72e39 383 fprintf(stderr, "Getting pack list for %s\n", repo->base);
8fcf7f9a 384
b8caac2b
TRC
385 switch (http_get_info_packs(repo->base, &repo->packs)) {
386 case HTTP_OK:
387 case HTTP_MISSING_TARGET:
388 repo->got_indices = 1;
389 ret = 0;
390 break;
391 default:
5e3a7691 392 repo->got_indices = 0;
b8caac2b 393 ret = -1;
b3661567 394 }
182005b9 395
3a462bc9 396 return ret;
182005b9
DB
397}
398
30ae764b 399static int fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9 400{
182005b9 401 struct packed_git *target;
49a0f240 402 int ret;
cb754fdf 403 struct slot_results results;
2264dfa5 404 struct http_pack_request *preq;
182005b9 405
30ae764b 406 if (fetch_indices(walker, repo))
182005b9 407 return -1;
b3661567 408 target = find_sha1_pack(sha1, repo->packs);
182005b9 409 if (!target)
b3661567 410 return -1;
182005b9 411
30ae764b 412 if (walker->get_verbosely) {
182005b9
DB
413 fprintf(stderr, "Getting pack %s\n",
414 sha1_to_hex(target->sha1));
415 fprintf(stderr, " which contains %s\n",
416 sha1_to_hex(sha1));
417 }
418
2264dfa5
TRC
419 preq = new_http_pack_request(target, repo->base);
420 if (preq == NULL)
421 goto abort;
422 preq->lst = &repo->packs;
423 preq->slot->results = &results;
182005b9 424
2264dfa5
TRC
425 if (start_active_slot(preq->slot)) {
426 run_active_slot(preq->slot);
c8568e13 427 if (results.curl_result != CURLE_OK) {
2264dfa5
TRC
428 error("Unable to get pack file %s\n%s", preq->url,
429 curl_errorstr);
430 goto abort;
1d389ab6
NH
431 }
432 } else {
2264dfa5
TRC
433 error("Unable to start request");
434 goto abort;
182005b9
DB
435 }
436
2264dfa5
TRC
437 ret = finish_http_pack_request(preq);
438 release_http_pack_request(preq);
49a0f240 439 if (ret)
b721e01f 440 return ret;
49a0f240 441
182005b9 442 return 0;
2264dfa5
TRC
443
444abort:
445 return -1;
182005b9
DB
446}
447
53f31389
MW
448static void abort_object_request(struct object_request *obj_req)
449{
53f31389
MW
450 release_object_request(obj_req);
451}
452
30ae764b 453static int fetch_object(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
6eb7ed54
DB
454{
455 char *hex = sha1_to_hex(sha1);
29508e1e 456 int ret = 0;
e388ab74 457 struct object_request *obj_req = object_queue_head;
5424bc55 458 struct http_object_request *req;
1d389ab6 459
a89fccd2 460 while (obj_req != NULL && hashcmp(obj_req->sha1, sha1))
e388ab74
NH
461 obj_req = obj_req->next;
462 if (obj_req == NULL)
1d389ab6
NH
463 return error("Couldn't find request for %s in the queue", hex);
464
e388ab74 465 if (has_sha1_file(obj_req->sha1)) {
5424bc55
TRC
466 if (obj_req->req != NULL)
467 abort_http_object_request(obj_req->req);
53f31389 468 abort_object_request(obj_req);
11f0dafe
NH
469 return 0;
470 }
471
a7a8d378 472#ifdef USE_CURL_MULTI
4c42aa1a 473 while (obj_req->state == WAITING)
29508e1e 474 step_active_slots();
a7a8d378 475#else
30ae764b 476 start_object_request(walker, obj_req);
a7a8d378 477#endif
6eb7ed54 478
5424bc55
TRC
479 /*
480 * obj_req->req might change when fetching alternates in the callback
481 * process_object_response; therefore, the "shortcut" variable, req,
482 * is used only after we're done with slots.
483 */
4c42aa1a 484 while (obj_req->state == ACTIVE)
5424bc55
TRC
485 run_active_slot(obj_req->req->slot);
486
487 req = obj_req->req;
4c42aa1a 488
5424bc55
TRC
489 if (req->localfile != -1) {
490 close(req->localfile);
491 req->localfile = -1;
313c4714 492 }
6eb7ed54 493
e388ab74 494 if (obj_req->state == ABORTED) {
29508e1e 495 ret = error("Request for %s aborted", hex);
5424bc55
TRC
496 } else if (req->curl_result != CURLE_OK &&
497 req->http_code != 416) {
498 if (missing_target(req))
e2029eb9
PB
499 ret = -1; /* Be silent, it is probably in a pack. */
500 else
501 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
5424bc55
TRC
502 req->errorstr, req->curl_result,
503 req->http_code, hex);
504 } else if (req->zret != Z_STREAM_END) {
30ae764b 505 walker->corrupt_object_found++;
5424bc55
TRC
506 ret = error("File %s (%s) corrupt", hex, req->url);
507 } else if (hashcmp(obj_req->sha1, req->real_sha1)) {
bd2afde8 508 ret = error("File %s has bad hash", hex);
5424bc55 509 } else if (req->rename < 0) {
7b934ec0 510 ret = error("unable to write sha1 filename %s",
0da8b2e7 511 sha1_file_name(req->sha1));
6eb7ed54 512 }
49a0f240 513
5424bc55 514 release_http_object_request(req);
e388ab74 515 release_object_request(obj_req);
29508e1e 516 return ret;
6eb7ed54
DB
517}
518
30ae764b 519static int fetch(struct walker *walker, unsigned char *sha1)
b3661567 520{
30ae764b
DB
521 struct walker_data *data = walker->data;
522 struct alt_base *altbase = data->alt;
1d389ab6 523
30ae764b 524 if (!fetch_object(walker, altbase, sha1))
1d389ab6 525 return 0;
b3661567 526 while (altbase) {
30ae764b 527 if (!fetch_pack(walker, altbase, sha1))
b3661567 528 return 0;
30ae764b 529 fetch_alternates(walker, data->alt->base);
b3661567
DB
530 altbase = altbase->next;
531 }
bd2afde8 532 return error("Unable to find %s under %s", sha1_to_hex(sha1),
30ae764b 533 data->alt->base);
b3661567
DB
534}
535
c13b2633 536static int fetch_ref(struct walker *walker, struct ref *ref)
cd541a68 537{
30ae764b 538 struct walker_data *data = walker->data;
c13b2633 539 return http_fetch_ref(data->alt->base, ref);
cd541a68
DB
540}
541
30ae764b
DB
542static void cleanup(struct walker *walker)
543{
09ae9aca
TRC
544 struct walker_data *data = walker->data;
545 struct alt_base *alt, *alt_next;
546
547 if (data) {
548 alt = data->alt;
549 while (alt) {
550 alt_next = alt->next;
551
552 free(alt->base);
553 free(alt);
554
555 alt = alt_next;
556 }
557 free(data);
558 walker->data = NULL;
559 }
30ae764b
DB
560}
561
888692b7 562struct walker *get_http_walker(const char *url)
6eb7ed54 563{
9c880b3e 564 char *s;
30ae764b
DB
565 struct walker_data *data = xmalloc(sizeof(struct walker_data));
566 struct walker *walker = xmalloc(sizeof(struct walker));
6eb7ed54 567
30ae764b
DB
568 data->alt = xmalloc(sizeof(*data->alt));
569 data->alt->base = xmalloc(strlen(url) + 1);
570 strcpy(data->alt->base, url);
571 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
9c880b3e 572 *s = 0;
6eb7ed54 573
30ae764b
DB
574 data->alt->got_indices = 0;
575 data->alt->packs = NULL;
576 data->alt->next = NULL;
577 data->got_alternates = -1;
fc57b6aa 578
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DB
579 walker->corrupt_object_found = 0;
580 walker->fetch = fetch;
581 walker->fetch_ref = fetch_ref;
582 walker->prefetch = prefetch;
583 walker->cleanup = cleanup;
584 walker->data = data;
6eb7ed54 585
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586#ifdef USE_CURL_MULTI
587 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
588#endif
8e29f6a0 589
30ae764b 590 return walker;
6eb7ed54 591}