http: factor out curl result code normalization
[git/git.git] / http-walker.c
CommitLineData
6eb7ed54 1#include "cache.h"
cf78ae4f 2#include "repository.h"
6eb7ed54 3#include "commit.h"
30ae764b 4#include "walker.h"
29508e1e 5#include "http.h"
94e99012 6#include "list.h"
abcbdc03 7#include "transport.h"
d6fe0036 8#include "packfile.h"
a80d72db 9#include "object-store.h"
7baa3e86 10
9cba13ca 11struct alt_base {
2afea3bc 12 char *base;
b3661567
DB
13 int got_indices;
14 struct packed_git *packs;
15 struct alt_base *next;
16};
17
e388ab74 18enum object_request_state {
1d389ab6
NH
19 WAITING,
20 ABORTED,
21 ACTIVE,
4b05548f 22 COMPLETE
1d389ab6 23};
6eb7ed54 24
9cba13ca 25struct object_request {
30ae764b 26 struct walker *walker;
16f0705d 27 struct object_id oid;
1d389ab6 28 struct alt_base *repo;
e388ab74 29 enum object_request_state state;
5424bc55 30 struct http_object_request *req;
94e99012 31 struct list_head node;
1d389ab6
NH
32};
33
e388ab74 34struct alternates_request {
30ae764b 35 struct walker *walker;
8e29f6a0 36 const char *base;
54ba4c5f 37 struct strbuf *url;
028c2976 38 struct strbuf *buffer;
acc075a8
NH
39 struct active_request_slot *slot;
40 int http_specific;
41};
42
30ae764b
DB
43struct walker_data {
44 const char *url;
45 int got_alternates;
46 struct alt_base *alt;
30ae764b
DB
47};
48
94e99012 49static LIST_HEAD(object_queue_head);
bc8f2652 50
30ae764b 51static void fetch_alternates(struct walker *walker, const char *base);
1d389ab6 52
29508e1e 53static void process_object_response(void *callback_data);
1d389ab6 54
30ae764b
DB
55static void start_object_request(struct walker *walker,
56 struct object_request *obj_req)
1d389ab6 57{
1d389ab6 58 struct active_request_slot *slot;
5424bc55 59 struct http_object_request *req;
1d389ab6 60
f0be0db1 61 req = new_http_object_request(obj_req->repo->base, &obj_req->oid);
5424bc55 62 if (req == NULL) {
e388ab74 63 obj_req->state = ABORTED;
1d389ab6
NH
64 return;
65 }
5424bc55 66 obj_req->req = req;
1d389ab6 67
5424bc55 68 slot = req->slot;
29508e1e 69 slot->callback_func = process_object_response;
e388ab74 70 slot->callback_data = obj_req;
1d389ab6 71
a7a8d378 72 /* Try to get the request started, abort the request on error */
e388ab74 73 obj_req->state = ACTIVE;
1d389ab6 74 if (!start_active_slot(slot)) {
e388ab74 75 obj_req->state = ABORTED;
5424bc55 76 release_http_object_request(req);
e388ab74 77 return;
1d389ab6 78 }
1d389ab6
NH
79}
80
e388ab74 81static void finish_object_request(struct object_request *obj_req)
1d389ab6 82{
5424bc55 83 if (finish_http_object_request(obj_req->req))
1d389ab6 84 return;
1d389ab6 85
5424bc55 86 if (obj_req->req->rename == 0)
16f0705d 87 walker_say(obj_req->walker, "got %s\n", oid_to_hex(&obj_req->oid));
1d389ab6
NH
88}
89
29508e1e
NH
90static void process_object_response(void *callback_data)
91{
e388ab74
NH
92 struct object_request *obj_req =
93 (struct object_request *)callback_data;
30ae764b
DB
94 struct walker *walker = obj_req->walker;
95 struct walker_data *data = walker->data;
96 struct alt_base *alt = data->alt;
29508e1e 97
5424bc55 98 process_http_object_request(obj_req->req);
e388ab74 99 obj_req->state = COMPLETE;
29508e1e
NH
100
101 /* Use alternates if necessary */
5424bc55 102 if (missing_target(obj_req->req)) {
30ae764b 103 fetch_alternates(walker, alt->base);
e388ab74
NH
104 if (obj_req->repo->next != NULL) {
105 obj_req->repo =
106 obj_req->repo->next;
5424bc55 107 release_http_object_request(obj_req->req);
30ae764b 108 start_object_request(walker, obj_req);
29508e1e
NH
109 return;
110 }
111 }
112
e388ab74 113 finish_object_request(obj_req);
29508e1e
NH
114}
115
e388ab74 116static void release_object_request(struct object_request *obj_req)
1d389ab6 117{
5424bc55
TRC
118 if (obj_req->req !=NULL && obj_req->req->localfile != -1)
119 error("fd leakage in release: %d", obj_req->req->localfile);
1d389ab6 120
94e99012 121 list_del(&obj_req->node);
e388ab74 122 free(obj_req);
1d389ab6
NH
123}
124
a7a8d378 125#ifdef USE_CURL_MULTI
30ae764b 126static int fill_active_slot(struct walker *walker)
1d389ab6 127{
45c17412 128 struct object_request *obj_req;
94e99012 129 struct list_head *pos, *tmp, *head = &object_queue_head;
1d389ab6 130
94e99012
EW
131 list_for_each_safe(pos, tmp, head) {
132 obj_req = list_entry(pos, struct object_request, node);
e388ab74 133 if (obj_req->state == WAITING) {
98374a07 134 if (has_object_file(&obj_req->oid))
09db444f 135 obj_req->state = COMPLETE;
45c17412 136 else {
30ae764b 137 start_object_request(walker, obj_req);
45c17412
DB
138 return 1;
139 }
f1a906a3 140 }
8fcf7f9a 141 }
45c17412 142 return 0;
1d389ab6 143}
a7a8d378 144#endif
1d389ab6 145
30ae764b 146static void prefetch(struct walker *walker, unsigned char *sha1)
1d389ab6 147{
e388ab74 148 struct object_request *newreq;
30ae764b 149 struct walker_data *data = walker->data;
1d389ab6
NH
150
151 newreq = xmalloc(sizeof(*newreq));
30ae764b 152 newreq->walker = walker;
16f0705d 153 hashcpy(newreq->oid.hash, sha1);
30ae764b 154 newreq->repo = data->alt;
1d389ab6 155 newreq->state = WAITING;
5424bc55 156 newreq->req = NULL;
1d389ab6 157
e9176745 158 http_is_verbose = walker->get_verbosely;
94e99012 159 list_add_tail(&newreq->node, &object_queue_head);
29508e1e 160
a7a8d378 161#ifdef USE_CURL_MULTI
29508e1e
NH
162 fill_active_slots();
163 step_active_slots();
a7a8d378 164#endif
1d389ab6
NH
165}
166
abcbdc03
JK
167static int is_alternate_allowed(const char *url)
168{
169 const char *protocols[] = {
170 "http", "https", "ftp", "ftps"
171 };
172 int i;
173
de461388
EW
174 if (http_follow_config != HTTP_FOLLOW_ALWAYS) {
175 warning("alternate disabled by http.followRedirects: %s", url);
176 return 0;
177 }
178
abcbdc03
JK
179 for (i = 0; i < ARRAY_SIZE(protocols); i++) {
180 const char *end;
181 if (skip_prefix(url, protocols[i], &end) &&
182 starts_with(end, "://"))
183 break;
184 }
185
186 if (i >= ARRAY_SIZE(protocols)) {
187 warning("ignoring alternate with unknown protocol: %s", url);
188 return 0;
189 }
190 if (!is_transport_allowed(protocols[i], 0)) {
191 warning("ignoring alternate with restricted protocol: %s", url);
192 return 0;
193 }
194
195 return 1;
196}
197
e388ab74 198static void process_alternates_response(void *callback_data)
b3661567 199{
e388ab74
NH
200 struct alternates_request *alt_req =
201 (struct alternates_request *)callback_data;
30ae764b
DB
202 struct walker *walker = alt_req->walker;
203 struct walker_data *cdata = walker->data;
acc075a8 204 struct active_request_slot *slot = alt_req->slot;
30ae764b 205 struct alt_base *tail = cdata->alt;
8e29f6a0 206 const char *base = alt_req->base;
a04ff3ec 207 const char null_byte = '\0';
acc075a8
NH
208 char *data;
209 int i = 0;
1d389ab6 210
acc075a8
NH
211 if (alt_req->http_specific) {
212 if (slot->curl_result != CURLE_OK ||
028c2976 213 !alt_req->buffer->len) {
acc075a8
NH
214
215 /* Try reusing the slot to get non-http alternates */
216 alt_req->http_specific = 0;
54ba4c5f
JK
217 strbuf_reset(alt_req->url);
218 strbuf_addf(alt_req->url, "%s/objects/info/alternates",
219 base);
acc075a8 220 curl_easy_setopt(slot->curl, CURLOPT_URL,
54ba4c5f 221 alt_req->url->buf);
acc075a8
NH
222 active_requests++;
223 slot->in_use = 1;
c9826473
NH
224 if (slot->finished != NULL)
225 (*slot->finished) = 0;
a3f583cb 226 if (!start_active_slot(slot)) {
30ae764b 227 cdata->got_alternates = -1;
29508e1e 228 slot->in_use = 0;
c9826473
NH
229 if (slot->finished != NULL)
230 (*slot->finished) = 1;
1d389ab6 231 }
a3f583cb 232 return;
b3661567 233 }
acc075a8 234 } else if (slot->curl_result != CURLE_OK) {
be4a015b 235 if (!missing_target(slot)) {
30ae764b 236 cdata->got_alternates = -1;
acc075a8
NH
237 return;
238 }
b3661567
DB
239 }
240
a04ff3ec 241 fwrite_buffer((char *)&null_byte, 1, 1, alt_req->buffer);
028c2976
MH
242 alt_req->buffer->len--;
243 data = alt_req->buffer->buf;
1b0c1e67 244
028c2976 245 while (i < alt_req->buffer->len) {
b3661567 246 int posn = i;
028c2976 247 while (posn < alt_req->buffer->len && data[posn] != '\n')
b3661567
DB
248 posn++;
249 if (data[posn] == '\n') {
1b0c1e67
DB
250 int okay = 0;
251 int serverlen = 0;
252 struct alt_base *newalt;
b3661567 253 if (data[i] == '/') {
4c42aa1a
TRC
254 /*
255 * This counts
5df1e0d0
JH
256 * http://git.host/pub/scm/linux.git/
257 * -----------here^
258 * so memcpy(dst, base, serverlen) will
259 * copy up to "...git.host".
260 */
261 const char *colon_ss = strstr(base,"://");
262 if (colon_ss) {
263 serverlen = (strchr(colon_ss + 3, '/')
264 - base);
265 okay = 1;
266 }
1b0c1e67 267 } else if (!memcmp(data + i, "../", 3)) {
4c42aa1a
TRC
268 /*
269 * Relative URL; chop the corresponding
5df1e0d0
JH
270 * number of subpath from base (and ../
271 * from data), and concatenate the result.
272 *
273 * The code first drops ../ from data, and
274 * then drops one ../ from data and one path
275 * from base. IOW, one extra ../ is dropped
276 * from data than path is dropped from base.
277 *
278 * This is not wrong. The alternate in
279 * http://git.host/pub/scm/linux.git/
280 * to borrow from
281 * http://git.host/pub/scm/linus.git/
282 * is ../../linus.git/objects/. You need
283 * two ../../ to borrow from your direct
284 * neighbour.
285 */
1b0c1e67
DB
286 i += 3;
287 serverlen = strlen(base);
8fcf7f9a 288 while (i + 2 < posn &&
1b0c1e67
DB
289 !memcmp(data + i, "../", 3)) {
290 do {
291 serverlen--;
292 } while (serverlen &&
293 base[serverlen - 1] != '/');
294 i += 3;
295 }
a9486b02 296 /* If the server got removed, give up. */
8fcf7f9a 297 okay = strchr(base, ':') - base + 3 <
4c42aa1a 298 serverlen;
acc075a8 299 } else if (alt_req->http_specific) {
1b0c1e67
DB
300 char *colon = strchr(data + i, ':');
301 char *slash = strchr(data + i, '/');
302 if (colon && slash && colon < data + posn &&
303 slash < data + posn && colon < slash) {
304 okay = 1;
305 }
306 }
1b0c1e67 307 if (okay) {
59b8263a
RS
308 struct strbuf target = STRBUF_INIT;
309 strbuf_add(&target, base, serverlen);
d61434ae
JK
310 strbuf_add(&target, data + i, posn - i);
311 if (!strbuf_strip_suffix(&target, "objects")) {
312 warning("ignoring alternate that does"
313 " not end in 'objects': %s",
314 target.buf);
315 strbuf_release(&target);
316 } else if (is_alternate_allowed(target.buf)) {
abcbdc03
JK
317 warning("adding alternate object store: %s",
318 target.buf);
319 newalt = xmalloc(sizeof(*newalt));
320 newalt->next = NULL;
321 newalt->base = strbuf_detach(&target, NULL);
322 newalt->got_indices = 0;
323 newalt->packs = NULL;
324
325 while (tail->next != NULL)
326 tail = tail->next;
327 tail->next = newalt;
5cae73d5
EW
328 } else {
329 strbuf_release(&target);
abcbdc03 330 }
b3661567
DB
331 }
332 }
333 i = posn + 1;
334 }
bc8f2652 335
30ae764b 336 cdata->got_alternates = 1;
acc075a8
NH
337}
338
30ae764b 339static void fetch_alternates(struct walker *walker, const char *base)
acc075a8 340{
028c2976 341 struct strbuf buffer = STRBUF_INIT;
54ba4c5f 342 struct strbuf url = STRBUF_INIT;
acc075a8 343 struct active_request_slot *slot;
cb754fdf 344 struct alternates_request alt_req;
30ae764b 345 struct walker_data *cdata = walker->data;
acc075a8 346
4c42aa1a
TRC
347 /*
348 * If another request has already started fetching alternates,
349 * wait for them to arrive and return to processing this request's
350 * curl message
351 */
29508e1e 352#ifdef USE_CURL_MULTI
30ae764b 353 while (cdata->got_alternates == 0) {
29508e1e 354 step_active_slots();
acc075a8 355 }
29508e1e 356#endif
acc075a8
NH
357
358 /* Nothing to do if they've already been fetched */
30ae764b 359 if (cdata->got_alternates == 1)
acc075a8
NH
360 return;
361
362 /* Start the fetch */
30ae764b 363 cdata->got_alternates = 0;
acc075a8 364
30ae764b 365 if (walker->get_verbosely)
acc075a8 366 fprintf(stderr, "Getting alternates list for %s\n", base);
8fcf7f9a 367
54ba4c5f 368 strbuf_addf(&url, "%s/objects/info/http-alternates", base);
acc075a8 369
4c42aa1a
TRC
370 /*
371 * Use a callback to process the result, since another request
372 * may fail and need to have alternates loaded before continuing
373 */
acc075a8 374 slot = get_active_slot();
e388ab74 375 slot->callback_func = process_alternates_response;
30ae764b 376 alt_req.walker = walker;
acc075a8
NH
377 slot->callback_data = &alt_req;
378
379 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
29508e1e 380 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
54ba4c5f 381 curl_easy_setopt(slot->curl, CURLOPT_URL, url.buf);
acc075a8
NH
382
383 alt_req.base = base;
54ba4c5f 384 alt_req.url = &url;
acc075a8
NH
385 alt_req.buffer = &buffer;
386 alt_req.http_specific = 1;
387 alt_req.slot = slot;
388
389 if (start_active_slot(slot))
390 run_active_slot(slot);
391 else
30ae764b 392 cdata->got_alternates = -1;
acc075a8 393
028c2976 394 strbuf_release(&buffer);
54ba4c5f 395 strbuf_release(&url);
b3661567
DB
396}
397
30ae764b 398static int fetch_indices(struct walker *walker, struct alt_base *repo)
182005b9 399{
b8caac2b 400 int ret;
1d389ab6 401
b3661567 402 if (repo->got_indices)
182005b9
DB
403 return 0;
404
30ae764b 405 if (walker->get_verbosely)
6fd72e39 406 fprintf(stderr, "Getting pack list for %s\n", repo->base);
8fcf7f9a 407
b8caac2b
TRC
408 switch (http_get_info_packs(repo->base, &repo->packs)) {
409 case HTTP_OK:
410 case HTTP_MISSING_TARGET:
411 repo->got_indices = 1;
412 ret = 0;
413 break;
414 default:
5e3a7691 415 repo->got_indices = 0;
b8caac2b 416 ret = -1;
b3661567 417 }
182005b9 418
3a462bc9 419 return ret;
182005b9
DB
420}
421
07c19e72 422static int http_fetch_pack(struct walker *walker, struct alt_base *repo, unsigned char *sha1)
182005b9 423{
182005b9 424 struct packed_git *target;
49a0f240 425 int ret;
cb754fdf 426 struct slot_results results;
2264dfa5 427 struct http_pack_request *preq;
182005b9 428
30ae764b 429 if (fetch_indices(walker, repo))
182005b9 430 return -1;
b3661567 431 target = find_sha1_pack(sha1, repo->packs);
182005b9 432 if (!target)
b3661567 433 return -1;
182005b9 434
30ae764b 435 if (walker->get_verbosely) {
182005b9
DB
436 fprintf(stderr, "Getting pack %s\n",
437 sha1_to_hex(target->sha1));
438 fprintf(stderr, " which contains %s\n",
439 sha1_to_hex(sha1));
440 }
441
2264dfa5
TRC
442 preq = new_http_pack_request(target, repo->base);
443 if (preq == NULL)
444 goto abort;
445 preq->lst = &repo->packs;
446 preq->slot->results = &results;
182005b9 447
2264dfa5
TRC
448 if (start_active_slot(preq->slot)) {
449 run_active_slot(preq->slot);
c8568e13 450 if (results.curl_result != CURLE_OK) {
2264dfa5
TRC
451 error("Unable to get pack file %s\n%s", preq->url,
452 curl_errorstr);
453 goto abort;
1d389ab6
NH
454 }
455 } else {
2264dfa5
TRC
456 error("Unable to start request");
457 goto abort;
182005b9
DB
458 }
459
2264dfa5
TRC
460 ret = finish_http_pack_request(preq);
461 release_http_pack_request(preq);
49a0f240 462 if (ret)
b721e01f 463 return ret;
49a0f240 464
182005b9 465 return 0;
2264dfa5
TRC
466
467abort:
468 return -1;
182005b9
DB
469}
470
53f31389
MW
471static void abort_object_request(struct object_request *obj_req)
472{
53f31389
MW
473 release_object_request(obj_req);
474}
475
43b8bba6 476static int fetch_object(struct walker *walker, unsigned char *sha1)
6eb7ed54
DB
477{
478 char *hex = sha1_to_hex(sha1);
29508e1e 479 int ret = 0;
94e99012 480 struct object_request *obj_req = NULL;
5424bc55 481 struct http_object_request *req;
94e99012 482 struct list_head *pos, *head = &object_queue_head;
1d389ab6 483
94e99012
EW
484 list_for_each(pos, head) {
485 obj_req = list_entry(pos, struct object_request, node);
e3ff0683 486 if (hasheq(obj_req->oid.hash, sha1))
94e99012
EW
487 break;
488 }
e388ab74 489 if (obj_req == NULL)
1d389ab6
NH
490 return error("Couldn't find request for %s in the queue", hex);
491
98374a07 492 if (has_object_file(&obj_req->oid)) {
5424bc55
TRC
493 if (obj_req->req != NULL)
494 abort_http_object_request(obj_req->req);
53f31389 495 abort_object_request(obj_req);
11f0dafe
NH
496 return 0;
497 }
498
a7a8d378 499#ifdef USE_CURL_MULTI
4c42aa1a 500 while (obj_req->state == WAITING)
29508e1e 501 step_active_slots();
a7a8d378 502#else
30ae764b 503 start_object_request(walker, obj_req);
a7a8d378 504#endif
6eb7ed54 505
5424bc55
TRC
506 /*
507 * obj_req->req might change when fetching alternates in the callback
508 * process_object_response; therefore, the "shortcut" variable, req,
509 * is used only after we're done with slots.
510 */
4c42aa1a 511 while (obj_req->state == ACTIVE)
5424bc55
TRC
512 run_active_slot(obj_req->req->slot);
513
514 req = obj_req->req;
4c42aa1a 515
5424bc55
TRC
516 if (req->localfile != -1) {
517 close(req->localfile);
518 req->localfile = -1;
313c4714 519 }
6eb7ed54 520
17966c0a
EW
521 /*
522 * we turned off CURLOPT_FAILONERROR to avoid losing a
523 * persistent connection and got CURLE_OK.
524 */
3680f16f 525 if (req->http_code >= 300 && req->curl_result == CURLE_OK &&
17966c0a 526 (starts_with(req->url, "http://") ||
3680f16f 527 starts_with(req->url, "https://"))) {
17966c0a 528 req->curl_result = CURLE_HTTP_RETURNED_ERROR;
3680f16f
JK
529 xsnprintf(req->errorstr, sizeof(req->errorstr),
530 "HTTP request failed");
531 }
17966c0a 532
e388ab74 533 if (obj_req->state == ABORTED) {
29508e1e 534 ret = error("Request for %s aborted", hex);
5424bc55
TRC
535 } else if (req->curl_result != CURLE_OK &&
536 req->http_code != 416) {
537 if (missing_target(req))
e2029eb9
PB
538 ret = -1; /* Be silent, it is probably in a pack. */
539 else
540 ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
5424bc55
TRC
541 req->errorstr, req->curl_result,
542 req->http_code, hex);
543 } else if (req->zret != Z_STREAM_END) {
30ae764b 544 walker->corrupt_object_found++;
5424bc55 545 ret = error("File %s (%s) corrupt", hex, req->url);
f0be0db1 546 } else if (!oideq(&obj_req->oid, &req->real_oid)) {
bd2afde8 547 ret = error("File %s has bad hash", hex);
5424bc55 548 } else if (req->rename < 0) {
ea657730 549 struct strbuf buf = STRBUF_INIT;
514c5fdd 550 loose_object_path(the_repository, &buf, &req->oid);
ea657730
CC
551 ret = error("unable to write sha1 filename %s", buf.buf);
552 strbuf_release(&buf);
6eb7ed54 553 }
49a0f240 554
5424bc55 555 release_http_object_request(req);
e388ab74 556 release_object_request(obj_req);
29508e1e 557 return ret;
6eb7ed54
DB
558}
559
30ae764b 560static int fetch(struct walker *walker, unsigned char *sha1)
b3661567 561{
30ae764b
DB
562 struct walker_data *data = walker->data;
563 struct alt_base *altbase = data->alt;
1d389ab6 564
43b8bba6 565 if (!fetch_object(walker, sha1))
1d389ab6 566 return 0;
b3661567 567 while (altbase) {
07c19e72 568 if (!http_fetch_pack(walker, altbase, sha1))
b3661567 569 return 0;
30ae764b 570 fetch_alternates(walker, data->alt->base);
b3661567
DB
571 altbase = altbase->next;
572 }
bd2afde8 573 return error("Unable to find %s under %s", sha1_to_hex(sha1),
30ae764b 574 data->alt->base);
b3661567
DB
575}
576
c13b2633 577static int fetch_ref(struct walker *walker, struct ref *ref)
cd541a68 578{
30ae764b 579 struct walker_data *data = walker->data;
c13b2633 580 return http_fetch_ref(data->alt->base, ref);
cd541a68
DB
581}
582
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DB
583static void cleanup(struct walker *walker)
584{
09ae9aca
TRC
585 struct walker_data *data = walker->data;
586 struct alt_base *alt, *alt_next;
587
588 if (data) {
589 alt = data->alt;
590 while (alt) {
591 alt_next = alt->next;
592
593 free(alt->base);
594 free(alt);
595
596 alt = alt_next;
597 }
598 free(data);
599 walker->data = NULL;
600 }
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DB
601}
602
888692b7 603struct walker *get_http_walker(const char *url)
6eb7ed54 604{
9c880b3e 605 char *s;
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DB
606 struct walker_data *data = xmalloc(sizeof(struct walker_data));
607 struct walker *walker = xmalloc(sizeof(struct walker));
6eb7ed54 608
30ae764b 609 data->alt = xmalloc(sizeof(*data->alt));
95244ae3 610 data->alt->base = xstrdup(url);
30ae764b 611 for (s = data->alt->base + strlen(data->alt->base) - 1; *s == '/'; --s)
9c880b3e 612 *s = 0;
6eb7ed54 613
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DB
614 data->alt->got_indices = 0;
615 data->alt->packs = NULL;
616 data->alt->next = NULL;
617 data->got_alternates = -1;
fc57b6aa 618
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DB
619 walker->corrupt_object_found = 0;
620 walker->fetch = fetch;
621 walker->fetch_ref = fetch_ref;
622 walker->prefetch = prefetch;
623 walker->cleanup = cleanup;
624 walker->data = data;
6eb7ed54 625
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DB
626#ifdef USE_CURL_MULTI
627 add_fill_function(walker, (int (*)(void *)) fill_active_slot);
628#endif
8e29f6a0 629
30ae764b 630 return walker;
6eb7ed54 631}