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