git.oblomov.eu Git - git/blob - http-push.c

   1 #include "cache.h"
   2 #include "repository.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec-cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14 #include "strvec.h"
  15 #include "packfile.h"
  16 #include "object-store.h"
  17 #include "commit-reach.h"
  18
  19 #ifdef EXPAT_NEEDS_XMLPARSE_H
  20 #include <xmlparse.h>
  21 #else
  22 #include <expat.h>
  23 #endif
  24
  25 static const char http_push_usage[] =
  26 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  27
  28 #ifndef XML_STATUS_OK
  29 enum XML_Status {
  30   XML_STATUS_OK = 1,
  31   XML_STATUS_ERROR = 0
  32 };
  33 #define XML_STATUS_OK    1
  34 #define XML_STATUS_ERROR 0
  35 #endif
  36
  37 #define PREV_BUF_SIZE 4096
  38
  39 /* DAV methods */
  40 #define DAV_LOCK "LOCK"
  41 #define DAV_MKCOL "MKCOL"
  42 #define DAV_MOVE "MOVE"
  43 #define DAV_PROPFIND "PROPFIND"
  44 #define DAV_PUT "PUT"
  45 #define DAV_UNLOCK "UNLOCK"
  46 #define DAV_DELETE "DELETE"
  47
  48 /* DAV lock flags */
  49 #define DAV_PROP_LOCKWR (1u << 0)
  50 #define DAV_PROP_LOCKEX (1u << 1)
  51 #define DAV_LOCK_OK (1u << 2)
  52
  53 /* DAV XML properties */
  54 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  55 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  56 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  57 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  58 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  59 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  60 #define DAV_PROPFIND_RESP ".multistatus.response"
  61 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  62 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  63
  64 /* DAV request body templates */
  65 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  66 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  67 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  68
  69 #define LOCK_TIME 600
  70 #define LOCK_REFRESH 30
  71
  72 /* Remember to update object flag allocation in object.h */
  73 #define LOCAL    (1u<<11)
  74 #define REMOTE   (1u<<12)
  75 #define FETCHING (1u<<13)
  76 #define PUSHING  (1u<<14)
  77
  78 /* We allow "recursive" symbolic refs. Only within reason, though */
  79 #define MAXDEPTH 5
  80
  81 static int pushing;
  82 static int aborted;
  83 static signed char remote_dir_exists[256];
  84
  85 static int push_verbosely;
  86 static int push_all = MATCH_REFS_NONE;
  87 static int force_all;
  88 static int dry_run;
  89 static int helper_status;
  90
  91 static struct object_list *objects;
  92
  93 struct repo {
  94         char *url;
  95         char *path;
  96         int path_len;
  97         int has_info_refs;
  98         int can_update_info_refs;
  99         int has_info_packs;
 100         struct packed_git *packs;
 101         struct remote_lock *locks;
 102 };
 103
 104 static struct repo *repo;
 105
 106 enum transfer_state {
 107         NEED_FETCH,
 108         RUN_FETCH_LOOSE,
 109         RUN_FETCH_PACKED,
 110         NEED_PUSH,
 111         RUN_MKCOL,
 112         RUN_PUT,
 113         RUN_MOVE,
 114         ABORTED,
 115         COMPLETE
 116 };
 117
 118 struct transfer_request {
 119         struct object *obj;
 120         struct packed_git *target;
 121         char *url;
 122         char *dest;
 123         struct remote_lock *lock;
 124         struct curl_slist *headers;
 125         struct buffer buffer;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         void *userData;
 131         struct active_request_slot *slot;
 132         struct transfer_request *next;
 133 };
 134
 135 static struct transfer_request *request_queue_head;
 136
 137 struct xml_ctx {
 138         char *name;
 139         int len;
 140         char *cdata;
 141         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 142         void *userData;
 143 };
 144
 145 struct remote_lock {
 146         char *url;
 147         char *owner;
 148         char *token;
 149         char tmpfile_suffix[GIT_MAX_HEXSZ + 1];
 150         time_t start_time;
 151         long timeout;
 152         int refreshing;
 153         struct remote_lock *next;
 154 };
 155
 156 /* Flags that control remote_ls processing */
 157 #define PROCESS_FILES (1u << 0)
 158 #define PROCESS_DIRS  (1u << 1)
 159 #define RECURSIVE     (1u << 2)
 160
 161 /* Flags that remote_ls passes to callback functions */
 162 #define IS_DIR (1u << 0)
 163
 164 struct remote_ls_ctx {
 165         char *path;
 166         void (*userFunc)(struct remote_ls_ctx *ls);
 167         void *userData;
 168         int flags;
 169         char *dentry_name;
 170         int dentry_flags;
 171         struct remote_ls_ctx *parent;
 172 };
 173
 174 /* get_dav_token_headers options */
 175 enum dav_header_flag {
 176         DAV_HEADER_IF = (1u << 0),
 177         DAV_HEADER_LOCK = (1u << 1),
 178         DAV_HEADER_TIMEOUT = (1u << 2)
 179 };
 180
 181 static char *xml_entities(const char *s)
 182 {
 183         struct strbuf buf = STRBUF_INIT;
 184         strbuf_addstr_xml_quoted(&buf, s);
 185         return strbuf_detach(&buf, NULL);
 186 }
 187
 188 static void curl_setup_http_get(CURL *curl, const char *url,
 189                 const char *custom_req)
 190 {
 191         curl_easy_setopt(curl, CURLOPT_HTTPGET, 1);
 192         curl_easy_setopt(curl, CURLOPT_URL, url);
 193         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 194         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 195 }
 196
 197 static void curl_setup_http(CURL *curl, const char *url,
 198                 const char *custom_req, struct buffer *buffer,
 199                 curl_write_callback write_fn)
 200 {
 201         curl_easy_setopt(curl, CURLOPT_PUT, 1);
 202         curl_easy_setopt(curl, CURLOPT_URL, url);
 203         curl_easy_setopt(curl, CURLOPT_INFILE, buffer);
 204         curl_easy_setopt(curl, CURLOPT_INFILESIZE, buffer->buf.len);
 205         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
 206 #ifndef NO_CURL_IOCTL
 207         curl_easy_setopt(curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 208         curl_easy_setopt(curl, CURLOPT_IOCTLDATA, buffer);
 209 #endif
 210         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_fn);
 211         curl_easy_setopt(curl, CURLOPT_NOBODY, 0);
 212         curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, custom_req);
 213         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1);
 214 }
 215
 216 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 217 {
 218         struct strbuf buf = STRBUF_INIT;
 219         struct curl_slist *dav_headers = http_copy_default_headers();
 220
 221         if (options & DAV_HEADER_IF) {
 222                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 223                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 224                 strbuf_reset(&buf);
 225         }
 226         if (options & DAV_HEADER_LOCK) {
 227                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 228                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 229                 strbuf_reset(&buf);
 230         }
 231         if (options & DAV_HEADER_TIMEOUT) {
 232                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 233                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 234                 strbuf_reset(&buf);
 235         }
 236         strbuf_release(&buf);
 237
 238         return dav_headers;
 239 }
 240
 241 static void finish_request(struct transfer_request *request);
 242 static void release_request(struct transfer_request *request);
 243
 244 static void process_response(void *callback_data)
 245 {
 246         struct transfer_request *request =
 247                 (struct transfer_request *)callback_data;
 248
 249         finish_request(request);
 250 }
 251
 252 #ifdef USE_CURL_MULTI
 253
 254 static void start_fetch_loose(struct transfer_request *request)
 255 {
 256         struct active_request_slot *slot;
 257         struct http_object_request *obj_req;
 258
 259         obj_req = new_http_object_request(repo->url, &request->obj->oid);
 260         if (obj_req == NULL) {
 261                 request->state = ABORTED;
 262                 return;
 263         }
 264
 265         slot = obj_req->slot;
 266         slot->callback_func = process_response;
 267         slot->callback_data = request;
 268         request->slot = slot;
 269         request->userData = obj_req;
 270
 271         /* Try to get the request started, abort the request on error */
 272         request->state = RUN_FETCH_LOOSE;
 273         if (!start_active_slot(slot)) {
 274                 fprintf(stderr, "Unable to start GET request\n");
 275                 repo->can_update_info_refs = 0;
 276                 release_http_object_request(obj_req);
 277                 release_request(request);
 278         }
 279 }
 280
 281 static void start_mkcol(struct transfer_request *request)
 282 {
 283         char *hex = oid_to_hex(&request->obj->oid);
 284         struct active_request_slot *slot;
 285
 286         request->url = get_remote_object_url(repo->url, hex, 1);
 287
 288         slot = get_active_slot();
 289         slot->callback_func = process_response;
 290         slot->callback_data = request;
 291         curl_setup_http_get(slot->curl, request->url, DAV_MKCOL);
 292         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 293
 294         if (start_active_slot(slot)) {
 295                 request->slot = slot;
 296                 request->state = RUN_MKCOL;
 297         } else {
 298                 request->state = ABORTED;
 299                 FREE_AND_NULL(request->url);
 300         }
 301 }
 302 #endif
 303
 304 static void start_fetch_packed(struct transfer_request *request)
 305 {
 306         struct packed_git *target;
 307
 308         struct transfer_request *check_request = request_queue_head;
 309         struct http_pack_request *preq;
 310
 311         target = find_sha1_pack(request->obj->oid.hash, repo->packs);
 312         if (!target) {
 313                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", oid_to_hex(&request->obj->oid));
 314                 repo->can_update_info_refs = 0;
 315                 release_request(request);
 316                 return;
 317         }
 318         close_pack_index(target);
 319         request->target = target;
 320
 321         fprintf(stderr, "Fetching pack %s\n",
 322                 hash_to_hex(target->hash));
 323         fprintf(stderr, " which contains %s\n", oid_to_hex(&request->obj->oid));
 324
 325         preq = new_http_pack_request(target->hash, repo->url);
 326         if (preq == NULL) {
 327                 repo->can_update_info_refs = 0;
 328                 return;
 329         }
 330
 331         /* Make sure there isn't another open request for this pack */
 332         while (check_request) {
 333                 if (check_request->state == RUN_FETCH_PACKED &&
 334                     !strcmp(check_request->url, preq->url)) {
 335                         release_http_pack_request(preq);
 336                         release_request(request);
 337                         return;
 338                 }
 339                 check_request = check_request->next;
 340         }
 341
 342         preq->slot->callback_func = process_response;
 343         preq->slot->callback_data = request;
 344         request->slot = preq->slot;
 345         request->userData = preq;
 346
 347         /* Try to get the request started, abort the request on error */
 348         request->state = RUN_FETCH_PACKED;
 349         if (!start_active_slot(preq->slot)) {
 350                 fprintf(stderr, "Unable to start GET request\n");
 351                 release_http_pack_request(preq);
 352                 repo->can_update_info_refs = 0;
 353                 release_request(request);
 354         }
 355 }
 356
 357 static void start_put(struct transfer_request *request)
 358 {
 359         char *hex = oid_to_hex(&request->obj->oid);
 360         struct active_request_slot *slot;
 361         struct strbuf buf = STRBUF_INIT;
 362         enum object_type type;
 363         char hdr[50];
 364         void *unpacked;
 365         unsigned long len;
 366         int hdrlen;
 367         ssize_t size;
 368         git_zstream stream;
 369
 370         unpacked = read_object_file(&request->obj->oid, &type, &len);
 371         hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %"PRIuMAX , type_name(type), (uintmax_t)len) + 1;
 372
 373         /* Set it up */
 374         git_deflate_init(&stream, zlib_compression_level);
 375         size = git_deflate_bound(&stream, len + hdrlen);
 376         strbuf_init(&request->buffer.buf, size);
 377         request->buffer.posn = 0;
 378
 379         /* Compress it */
 380         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 381         stream.avail_out = size;
 382
 383         /* First header.. */
 384         stream.next_in = (void *)hdr;
 385         stream.avail_in = hdrlen;
 386         while (git_deflate(&stream, 0) == Z_OK)
 387                 ; /* nothing */
 388
 389         /* Then the data itself.. */
 390         stream.next_in = unpacked;
 391         stream.avail_in = len;
 392         while (git_deflate(&stream, Z_FINISH) == Z_OK)
 393                 ; /* nothing */
 394         git_deflate_end(&stream);
 395         free(unpacked);
 396
 397         request->buffer.buf.len = stream.total_out;
 398
 399         strbuf_addstr(&buf, "Destination: ");
 400         append_remote_object_url(&buf, repo->url, hex, 0);
 401         request->dest = strbuf_detach(&buf, NULL);
 402
 403         append_remote_object_url(&buf, repo->url, hex, 0);
 404         strbuf_add(&buf, request->lock->tmpfile_suffix, the_hash_algo->hexsz + 1);
 405         request->url = strbuf_detach(&buf, NULL);
 406
 407         slot = get_active_slot();
 408         slot->callback_func = process_response;
 409         slot->callback_data = request;
 410         curl_setup_http(slot->curl, request->url, DAV_PUT,
 411                         &request->buffer, fwrite_null);
 412
 413         if (start_active_slot(slot)) {
 414                 request->slot = slot;
 415                 request->state = RUN_PUT;
 416         } else {
 417                 request->state = ABORTED;
 418                 FREE_AND_NULL(request->url);
 419         }
 420 }
 421
 422 static void start_move(struct transfer_request *request)
 423 {
 424         struct active_request_slot *slot;
 425         struct curl_slist *dav_headers = http_copy_default_headers();
 426
 427         slot = get_active_slot();
 428         slot->callback_func = process_response;
 429         slot->callback_data = request;
 430         curl_setup_http_get(slot->curl, request->url, DAV_MOVE);
 431         dav_headers = curl_slist_append(dav_headers, request->dest);
 432         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 433         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 434
 435         if (start_active_slot(slot)) {
 436                 request->slot = slot;
 437                 request->state = RUN_MOVE;
 438         } else {
 439                 request->state = ABORTED;
 440                 FREE_AND_NULL(request->url);
 441         }
 442 }
 443
 444 static int refresh_lock(struct remote_lock *lock)
 445 {
 446         struct active_request_slot *slot;
 447         struct slot_results results;
 448         struct curl_slist *dav_headers;
 449         int rc = 0;
 450
 451         lock->refreshing = 1;
 452
 453         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 454
 455         slot = get_active_slot();
 456         slot->results = &results;
 457         curl_setup_http_get(slot->curl, lock->url, DAV_LOCK);
 458         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 459
 460         if (start_active_slot(slot)) {
 461                 run_active_slot(slot);
 462                 if (results.curl_result != CURLE_OK) {
 463                         fprintf(stderr, "LOCK HTTP error %ld\n",
 464                                 results.http_code);
 465                 } else {
 466                         lock->start_time = time(NULL);
 467                         rc = 1;
 468                 }
 469         }
 470
 471         lock->refreshing = 0;
 472         curl_slist_free_all(dav_headers);
 473
 474         return rc;
 475 }
 476
 477 static void check_locks(void)
 478 {
 479         struct remote_lock *lock = repo->locks;
 480         time_t current_time = time(NULL);
 481         int time_remaining;
 482
 483         while (lock) {
 484                 time_remaining = lock->start_time + lock->timeout -
 485                         current_time;
 486                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 487                         if (!refresh_lock(lock)) {
 488                                 fprintf(stderr,
 489                                         "Unable to refresh lock for %s\n",
 490                                         lock->url);
 491                                 aborted = 1;
 492                                 return;
 493                         }
 494                 }
 495                 lock = lock->next;
 496         }
 497 }
 498
 499 static void release_request(struct transfer_request *request)
 500 {
 501         struct transfer_request *entry = request_queue_head;
 502
 503         if (request == request_queue_head) {
 504                 request_queue_head = request->next;
 505         } else {
 506                 while (entry && entry->next != request)
 507                         entry = entry->next;
 508                 if (entry)
 509                         entry->next = request->next;
 510         }
 511
 512         free(request->url);
 513         free(request);
 514 }
 515
 516 static void finish_request(struct transfer_request *request)
 517 {
 518         struct http_pack_request *preq;
 519         struct http_object_request *obj_req;
 520
 521         request->curl_result = request->slot->curl_result;
 522         request->http_code = request->slot->http_code;
 523         request->slot = NULL;
 524
 525         /* Keep locks active */
 526         check_locks();
 527
 528         if (request->headers != NULL)
 529                 curl_slist_free_all(request->headers);
 530
 531         /* URL is reused for MOVE after PUT and used during FETCH */
 532         if (request->state != RUN_PUT && request->state != RUN_FETCH_PACKED) {
 533                 FREE_AND_NULL(request->url);
 534         }
 535
 536         if (request->state == RUN_MKCOL) {
 537                 if (request->curl_result == CURLE_OK ||
 538                     request->http_code == 405) {
 539                         remote_dir_exists[request->obj->oid.hash[0]] = 1;
 540                         start_put(request);
 541                 } else {
 542                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 543                                 oid_to_hex(&request->obj->oid),
 544                                 request->curl_result, request->http_code);
 545                         request->state = ABORTED;
 546                         aborted = 1;
 547                 }
 548         } else if (request->state == RUN_PUT) {
 549                 if (request->curl_result == CURLE_OK) {
 550                         start_move(request);
 551                 } else {
 552                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 553                                 oid_to_hex(&request->obj->oid),
 554                                 request->curl_result, request->http_code);
 555                         request->state = ABORTED;
 556                         aborted = 1;
 557                 }
 558         } else if (request->state == RUN_MOVE) {
 559                 if (request->curl_result == CURLE_OK) {
 560                         if (push_verbosely)
 561                                 fprintf(stderr, "    sent %s\n",
 562                                         oid_to_hex(&request->obj->oid));
 563                         request->obj->flags |= REMOTE;
 564                         release_request(request);
 565                 } else {
 566                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 567                                 oid_to_hex(&request->obj->oid),
 568                                 request->curl_result, request->http_code);
 569                         request->state = ABORTED;
 570                         aborted = 1;
 571                 }
 572         } else if (request->state == RUN_FETCH_LOOSE) {
 573                 obj_req = (struct http_object_request *)request->userData;
 574
 575                 if (finish_http_object_request(obj_req) == 0)
 576                         if (obj_req->rename == 0)
 577                                 request->obj->flags |= (LOCAL | REMOTE);
 578
 579                 /* Try fetching packed if necessary */
 580                 if (request->obj->flags & LOCAL) {
 581                         release_http_object_request(obj_req);
 582                         release_request(request);
 583                 } else
 584                         start_fetch_packed(request);
 585
 586         } else if (request->state == RUN_FETCH_PACKED) {
 587                 int fail = 1;
 588                 if (request->curl_result != CURLE_OK) {
 589                         fprintf(stderr, "Unable to get pack file %s\n%s",
 590                                 request->url, curl_errorstr);
 591                 } else {
 592                         preq = (struct http_pack_request *)request->userData;
 593
 594                         if (preq) {
 595                                 if (finish_http_pack_request(preq) == 0)
 596                                         fail = 0;
 597                                 release_http_pack_request(preq);
 598                         }
 599                 }
 600                 if (fail)
 601                         repo->can_update_info_refs = 0;
 602                 else
 603                         http_install_packfile(request->target, &repo->packs);
 604                 release_request(request);
 605         }
 606 }
 607
 608 #ifdef USE_CURL_MULTI
 609 static int is_running_queue;
 610 static int fill_active_slot(void *unused)
 611 {
 612         struct transfer_request *request;
 613
 614         if (aborted || !is_running_queue)
 615                 return 0;
 616
 617         for (request = request_queue_head; request; request = request->next) {
 618                 if (request->state == NEED_FETCH) {
 619                         start_fetch_loose(request);
 620                         return 1;
 621                 } else if (pushing && request->state == NEED_PUSH) {
 622                         if (remote_dir_exists[request->obj->oid.hash[0]] == 1) {
 623                                 start_put(request);
 624                         } else {
 625                                 start_mkcol(request);
 626                         }
 627                         return 1;
 628                 }
 629         }
 630         return 0;
 631 }
 632 #endif
 633
 634 static void get_remote_object_list(unsigned char parent);
 635
 636 static void add_fetch_request(struct object *obj)
 637 {
 638         struct transfer_request *request;
 639
 640         check_locks();
 641
 642         /*
 643          * Don't fetch the object if it's known to exist locally
 644          * or is already in the request queue
 645          */
 646         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 647                 get_remote_object_list(obj->oid.hash[0]);
 648         if (obj->flags & (LOCAL | FETCHING))
 649                 return;
 650
 651         obj->flags |= FETCHING;
 652         request = xmalloc(sizeof(*request));
 653         request->obj = obj;
 654         request->url = NULL;
 655         request->lock = NULL;
 656         request->headers = NULL;
 657         request->state = NEED_FETCH;
 658         request->next = request_queue_head;
 659         request_queue_head = request;
 660
 661 #ifdef USE_CURL_MULTI
 662         fill_active_slots();
 663         step_active_slots();
 664 #endif
 665 }
 666
 667 static int add_send_request(struct object *obj, struct remote_lock *lock)
 668 {
 669         struct transfer_request *request;
 670         struct packed_git *target;
 671
 672         /* Keep locks active */
 673         check_locks();
 674
 675         /*
 676          * Don't push the object if it's known to exist on the remote
 677          * or is already in the request queue
 678          */
 679         if (remote_dir_exists[obj->oid.hash[0]] == -1)
 680                 get_remote_object_list(obj->oid.hash[0]);
 681         if (obj->flags & (REMOTE | PUSHING))
 682                 return 0;
 683         target = find_sha1_pack(obj->oid.hash, repo->packs);
 684         if (target) {
 685                 obj->flags |= REMOTE;
 686                 return 0;
 687         }
 688
 689         obj->flags |= PUSHING;
 690         request = xmalloc(sizeof(*request));
 691         request->obj = obj;
 692         request->url = NULL;
 693         request->lock = lock;
 694         request->headers = NULL;
 695         request->state = NEED_PUSH;
 696         request->next = request_queue_head;
 697         request_queue_head = request;
 698
 699 #ifdef USE_CURL_MULTI
 700         fill_active_slots();
 701         step_active_slots();
 702 #endif
 703
 704         return 1;
 705 }
 706
 707 static int fetch_indices(void)
 708 {
 709         int ret;
 710
 711         if (push_verbosely)
 712                 fprintf(stderr, "Getting pack list\n");
 713
 714         switch (http_get_info_packs(repo->url, &repo->packs)) {
 715         case HTTP_OK:
 716         case HTTP_MISSING_TARGET:
 717                 ret = 0;
 718                 break;
 719         default:
 720                 ret = -1;
 721         }
 722
 723         return ret;
 724 }
 725
 726 static void one_remote_object(const struct object_id *oid)
 727 {
 728         struct object *obj;
 729
 730         obj = lookup_object(the_repository, oid);
 731         if (!obj)
 732                 obj = parse_object(the_repository, oid);
 733
 734         /* Ignore remote objects that don't exist locally */
 735         if (!obj)
 736                 return;
 737
 738         obj->flags |= REMOTE;
 739         if (!object_list_contains(objects, obj))
 740                 object_list_insert(obj, &objects);
 741 }
 742
 743 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 744 {
 745         int *lock_flags = (int *)ctx->userData;
 746
 747         if (tag_closed) {
 748                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 749                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 750                             (*lock_flags & DAV_PROP_LOCKWR)) {
 751                                 *lock_flags |= DAV_LOCK_OK;
 752                         }
 753                         *lock_flags &= DAV_LOCK_OK;
 754                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 755                         *lock_flags |= DAV_PROP_LOCKWR;
 756                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 757                         *lock_flags |= DAV_PROP_LOCKEX;
 758                 }
 759         }
 760 }
 761
 762 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 763 {
 764         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 765         git_hash_ctx hash_ctx;
 766         unsigned char lock_token_hash[GIT_MAX_RAWSZ];
 767
 768         if (tag_closed && ctx->cdata) {
 769                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 770                         lock->owner = xstrdup(ctx->cdata);
 771                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 772                         const char *arg;
 773                         if (skip_prefix(ctx->cdata, "Second-", &arg))
 774                                 lock->timeout = strtol(arg, NULL, 10);
 775                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 776                         lock->token = xstrdup(ctx->cdata);
 777
 778                         the_hash_algo->init_fn(&hash_ctx);
 779                         the_hash_algo->update_fn(&hash_ctx, lock->token, strlen(lock->token));
 780                         the_hash_algo->final_fn(lock_token_hash, &hash_ctx);
 781
 782                         lock->tmpfile_suffix[0] = '_';
 783                         memcpy(lock->tmpfile_suffix + 1, hash_to_hex(lock_token_hash), the_hash_algo->hexsz);
 784                 }
 785         }
 786 }
 787
 788 static void one_remote_ref(const char *refname);
 789
 790 static void
 791 xml_start_tag(void *userData, const char *name, const char **atts)
 792 {
 793         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 794         const char *c = strchr(name, ':');
 795         int old_namelen, new_len;
 796
 797         if (c == NULL)
 798                 c = name;
 799         else
 800                 c++;
 801
 802         old_namelen = strlen(ctx->name);
 803         new_len = old_namelen + strlen(c) + 2;
 804
 805         if (new_len > ctx->len) {
 806                 ctx->name = xrealloc(ctx->name, new_len);
 807                 ctx->len = new_len;
 808         }
 809         xsnprintf(ctx->name + old_namelen, ctx->len - old_namelen, ".%s", c);
 810
 811         FREE_AND_NULL(ctx->cdata);
 812
 813         ctx->userFunc(ctx, 0);
 814 }
 815
 816 static void
 817 xml_end_tag(void *userData, const char *name)
 818 {
 819         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 820         const char *c = strchr(name, ':');
 821         char *ep;
 822
 823         ctx->userFunc(ctx, 1);
 824
 825         if (c == NULL)
 826                 c = name;
 827         else
 828                 c++;
 829
 830         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 831         *ep = 0;
 832 }
 833
 834 static void
 835 xml_cdata(void *userData, const XML_Char *s, int len)
 836 {
 837         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 838         free(ctx->cdata);
 839         ctx->cdata = xmemdupz(s, len);
 840 }
 841
 842 static struct remote_lock *lock_remote(const char *path, long timeout)
 843 {
 844         struct active_request_slot *slot;
 845         struct slot_results results;
 846         struct buffer out_buffer = { STRBUF_INIT, 0 };
 847         struct strbuf in_buffer = STRBUF_INIT;
 848         char *url;
 849         char *ep;
 850         char timeout_header[25];
 851         struct remote_lock *lock = NULL;
 852         struct curl_slist *dav_headers = http_copy_default_headers();
 853         struct xml_ctx ctx;
 854         char *escaped;
 855
 856         url = xstrfmt("%s%s", repo->url, path);
 857
 858         /* Make sure leading directories exist for the remote ref */
 859         ep = strchr(url + strlen(repo->url) + 1, '/');
 860         while (ep) {
 861                 char saved_character = ep[1];
 862                 ep[1] = '\0';
 863                 slot = get_active_slot();
 864                 slot->results = &results;
 865                 curl_setup_http_get(slot->curl, url, DAV_MKCOL);
 866                 if (start_active_slot(slot)) {
 867                         run_active_slot(slot);
 868                         if (results.curl_result != CURLE_OK &&
 869                             results.http_code != 405) {
 870                                 fprintf(stderr,
 871                                         "Unable to create branch path %s\n",
 872                                         url);
 873                                 free(url);
 874                                 return NULL;
 875                         }
 876                 } else {
 877                         fprintf(stderr, "Unable to start MKCOL request\n");
 878                         free(url);
 879                         return NULL;
 880                 }
 881                 ep[1] = saved_character;
 882                 ep = strchr(ep + 1, '/');
 883         }
 884
 885         escaped = xml_entities(ident_default_email());
 886         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 887         free(escaped);
 888
 889         xsnprintf(timeout_header, sizeof(timeout_header), "Timeout: Second-%ld", timeout);
 890         dav_headers = curl_slist_append(dav_headers, timeout_header);
 891         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 892
 893         slot = get_active_slot();
 894         slot->results = &results;
 895         curl_setup_http(slot->curl, url, DAV_LOCK, &out_buffer, fwrite_buffer);
 896         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 897         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 898
 899         CALLOC_ARRAY(lock, 1);
 900         lock->timeout = -1;
 901
 902         if (start_active_slot(slot)) {
 903                 run_active_slot(slot);
 904                 if (results.curl_result == CURLE_OK) {
 905                         XML_Parser parser = XML_ParserCreate(NULL);
 906                         enum XML_Status result;
 907                         ctx.name = xcalloc(10, 1);
 908                         ctx.len = 0;
 909                         ctx.cdata = NULL;
 910                         ctx.userFunc = handle_new_lock_ctx;
 911                         ctx.userData = lock;
 912                         XML_SetUserData(parser, &ctx);
 913                         XML_SetElementHandler(parser, xml_start_tag,
 914                                               xml_end_tag);
 915                         XML_SetCharacterDataHandler(parser, xml_cdata);
 916                         result = XML_Parse(parser, in_buffer.buf,
 917                                            in_buffer.len, 1);
 918                         free(ctx.name);
 919                         if (result != XML_STATUS_OK) {
 920                                 fprintf(stderr, "XML error: %s\n",
 921                                         XML_ErrorString(
 922                                                 XML_GetErrorCode(parser)));
 923                                 lock->timeout = -1;
 924                         }
 925                         XML_ParserFree(parser);
 926                 } else {
 927                         fprintf(stderr,
 928                                 "error: curl result=%d, HTTP code=%ld\n",
 929                                 results.curl_result, results.http_code);
 930                 }
 931         } else {
 932                 fprintf(stderr, "Unable to start LOCK request\n");
 933         }
 934
 935         curl_slist_free_all(dav_headers);
 936         strbuf_release(&out_buffer.buf);
 937         strbuf_release(&in_buffer);
 938
 939         if (lock->token == NULL || lock->timeout <= 0) {
 940                 free(lock->token);
 941                 free(lock->owner);
 942                 free(url);
 943                 FREE_AND_NULL(lock);
 944         } else {
 945                 lock->url = url;
 946                 lock->start_time = time(NULL);
 947                 lock->next = repo->locks;
 948                 repo->locks = lock;
 949         }
 950
 951         return lock;
 952 }
 953
 954 static int unlock_remote(struct remote_lock *lock)
 955 {
 956         struct active_request_slot *slot;
 957         struct slot_results results;
 958         struct remote_lock *prev = repo->locks;
 959         struct curl_slist *dav_headers;
 960         int rc = 0;
 961
 962         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 963
 964         slot = get_active_slot();
 965         slot->results = &results;
 966         curl_setup_http_get(slot->curl, lock->url, DAV_UNLOCK);
 967         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 968
 969         if (start_active_slot(slot)) {
 970                 run_active_slot(slot);
 971                 if (results.curl_result == CURLE_OK)
 972                         rc = 1;
 973                 else
 974                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
 975                                 results.http_code);
 976         } else {
 977                 fprintf(stderr, "Unable to start UNLOCK request\n");
 978         }
 979
 980         curl_slist_free_all(dav_headers);
 981
 982         if (repo->locks == lock) {
 983                 repo->locks = lock->next;
 984         } else {
 985                 while (prev && prev->next != lock)
 986                         prev = prev->next;
 987                 if (prev)
 988                         prev->next = lock->next;
 989         }
 990
 991         free(lock->owner);
 992         free(lock->url);
 993         free(lock->token);
 994         free(lock);
 995
 996         return rc;
 997 }
 998
 999 static void remove_locks(void)
1000 {
1001         struct remote_lock *lock = repo->locks;
1002
1003         fprintf(stderr, "Removing remote locks...\n");
1004         while (lock) {
1005                 struct remote_lock *next = lock->next;
1006                 unlock_remote(lock);
1007                 lock = next;
1008         }
1009 }
1010
1011 static void remove_locks_on_signal(int signo)
1012 {
1013         remove_locks();
1014         sigchain_pop(signo);
1015         raise(signo);
1016 }
1017
1018 static void remote_ls(const char *path, int flags,
1019                       void (*userFunc)(struct remote_ls_ctx *ls),
1020                       void *userData);
1021
1022 /* extract hex from sharded "xx/x{38}" filename */
1023 static int get_oid_hex_from_objpath(const char *path, struct object_id *oid)
1024 {
1025         oid->algo = hash_algo_by_ptr(the_hash_algo);
1026
1027         if (strlen(path) != the_hash_algo->hexsz + 1)
1028                 return -1;
1029
1030         if (hex_to_bytes(oid->hash, path, 1))
1031                 return -1;
1032         path += 2;
1033         path++; /* skip '/' */
1034
1035         return hex_to_bytes(oid->hash + 1, path, the_hash_algo->rawsz - 1);
1036 }
1037
1038 static void process_ls_object(struct remote_ls_ctx *ls)
1039 {
1040         unsigned int *parent = (unsigned int *)ls->userData;
1041         const char *path = ls->dentry_name;
1042         struct object_id oid;
1043
1044         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1045                 remote_dir_exists[*parent] = 1;
1046                 return;
1047         }
1048
1049         if (!skip_prefix(path, "objects/", &path) ||
1050             get_oid_hex_from_objpath(path, &oid))
1051                 return;
1052
1053         one_remote_object(&oid);
1054 }
1055
1056 static void process_ls_ref(struct remote_ls_ctx *ls)
1057 {
1058         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1059                 fprintf(stderr, "  %s\n", ls->dentry_name);
1060                 return;
1061         }
1062
1063         if (!(ls->dentry_flags & IS_DIR))
1064                 one_remote_ref(ls->dentry_name);
1065 }
1066
1067 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1068 {
1069         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1070
1071         if (tag_closed) {
1072                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1073                         if (ls->dentry_flags & IS_DIR) {
1074
1075                                 /* ensure collection names end with slash */
1076                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1077
1078                                 if (ls->flags & PROCESS_DIRS) {
1079                                         ls->userFunc(ls);
1080                                 }
1081                                 if (strcmp(ls->dentry_name, ls->path) &&
1082                                     ls->flags & RECURSIVE) {
1083                                         remote_ls(ls->dentry_name,
1084                                                   ls->flags,
1085                                                   ls->userFunc,
1086                                                   ls->userData);
1087                                 }
1088                         } else if (ls->flags & PROCESS_FILES) {
1089                                 ls->userFunc(ls);
1090                         }
1091                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1092                         char *path = ctx->cdata;
1093                         if (*ctx->cdata == 'h') {
1094                                 path = strstr(path, "//");
1095                                 if (path) {
1096                                         path = strchr(path+2, '/');
1097                                 }
1098                         }
1099                         if (path) {
1100                                 const char *url = repo->url;
1101                                 if (repo->path)
1102                                         url = repo->path;
1103                                 if (strncmp(path, url, repo->path_len))
1104                                         error("Parsed path '%s' does not match url: '%s'",
1105                                               path, url);
1106                                 else {
1107                                         path += repo->path_len;
1108                                         ls->dentry_name = xstrdup(path);
1109                                 }
1110                         }
1111                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1112                         ls->dentry_flags |= IS_DIR;
1113                 }
1114         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1115                 FREE_AND_NULL(ls->dentry_name);
1116                 ls->dentry_flags = 0;
1117         }
1118 }
1119
1120 /*
1121  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1122  * should _only_ heed the information from that file, instead of trying to
1123  * determine the refs from the remote file system (badly: it does not even
1124  * know about packed-refs).
1125  */
1126 static void remote_ls(const char *path, int flags,
1127                       void (*userFunc)(struct remote_ls_ctx *ls),
1128                       void *userData)
1129 {
1130         char *url = xstrfmt("%s%s", repo->url, path);
1131         struct active_request_slot *slot;
1132         struct slot_results results;
1133         struct strbuf in_buffer = STRBUF_INIT;
1134         struct buffer out_buffer = { STRBUF_INIT, 0 };
1135         struct curl_slist *dav_headers = http_copy_default_headers();
1136         struct xml_ctx ctx;
1137         struct remote_ls_ctx ls;
1138
1139         ls.flags = flags;
1140         ls.path = xstrdup(path);
1141         ls.dentry_name = NULL;
1142         ls.dentry_flags = 0;
1143         ls.userData = userData;
1144         ls.userFunc = userFunc;
1145
1146         strbuf_addstr(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1147
1148         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1149         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1150
1151         slot = get_active_slot();
1152         slot->results = &results;
1153         curl_setup_http(slot->curl, url, DAV_PROPFIND,
1154                         &out_buffer, fwrite_buffer);
1155         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1156         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1157
1158         if (start_active_slot(slot)) {
1159                 run_active_slot(slot);
1160                 if (results.curl_result == CURLE_OK) {
1161                         XML_Parser parser = XML_ParserCreate(NULL);
1162                         enum XML_Status result;
1163                         ctx.name = xcalloc(10, 1);
1164                         ctx.len = 0;
1165                         ctx.cdata = NULL;
1166                         ctx.userFunc = handle_remote_ls_ctx;
1167                         ctx.userData = &ls;
1168                         XML_SetUserData(parser, &ctx);
1169                         XML_SetElementHandler(parser, xml_start_tag,
1170                                               xml_end_tag);
1171                         XML_SetCharacterDataHandler(parser, xml_cdata);
1172                         result = XML_Parse(parser, in_buffer.buf,
1173                                            in_buffer.len, 1);
1174                         free(ctx.name);
1175
1176                         if (result != XML_STATUS_OK) {
1177                                 fprintf(stderr, "XML error: %s\n",
1178                                         XML_ErrorString(
1179                                                 XML_GetErrorCode(parser)));
1180                         }
1181                         XML_ParserFree(parser);
1182                 }
1183         } else {
1184                 fprintf(stderr, "Unable to start PROPFIND request\n");
1185         }
1186
1187         free(ls.path);
1188         free(url);
1189         strbuf_release(&out_buffer.buf);
1190         strbuf_release(&in_buffer);
1191         curl_slist_free_all(dav_headers);
1192 }
1193
1194 static void get_remote_object_list(unsigned char parent)
1195 {
1196         char path[] = "objects/XX/";
1197         static const char hex[] = "0123456789abcdef";
1198         unsigned int val = parent;
1199
1200         path[8] = hex[val >> 4];
1201         path[9] = hex[val & 0xf];
1202         remote_dir_exists[val] = 0;
1203         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1204                   process_ls_object, &val);
1205 }
1206
1207 static int locking_available(void)
1208 {
1209         struct active_request_slot *slot;
1210         struct slot_results results;
1211         struct strbuf in_buffer = STRBUF_INIT;
1212         struct buffer out_buffer = { STRBUF_INIT, 0 };
1213         struct curl_slist *dav_headers = http_copy_default_headers();
1214         struct xml_ctx ctx;
1215         int lock_flags = 0;
1216         char *escaped;
1217
1218         escaped = xml_entities(repo->url);
1219         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1220         free(escaped);
1221
1222         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1223         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1224
1225         slot = get_active_slot();
1226         slot->results = &results;
1227         curl_setup_http(slot->curl, repo->url, DAV_PROPFIND,
1228                         &out_buffer, fwrite_buffer);
1229         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1230         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1231
1232         if (start_active_slot(slot)) {
1233                 run_active_slot(slot);
1234                 if (results.curl_result == CURLE_OK) {
1235                         XML_Parser parser = XML_ParserCreate(NULL);
1236                         enum XML_Status result;
1237                         ctx.name = xcalloc(10, 1);
1238                         ctx.len = 0;
1239                         ctx.cdata = NULL;
1240                         ctx.userFunc = handle_lockprop_ctx;
1241                         ctx.userData = &lock_flags;
1242                         XML_SetUserData(parser, &ctx);
1243                         XML_SetElementHandler(parser, xml_start_tag,
1244                                               xml_end_tag);
1245                         result = XML_Parse(parser, in_buffer.buf,
1246                                            in_buffer.len, 1);
1247                         free(ctx.name);
1248
1249                         if (result != XML_STATUS_OK) {
1250                                 fprintf(stderr, "XML error: %s\n",
1251                                         XML_ErrorString(
1252                                                 XML_GetErrorCode(parser)));
1253                                 lock_flags = 0;
1254                         }
1255                         XML_ParserFree(parser);
1256                         if (!lock_flags)
1257                                 error("no DAV locking support on %s",
1258                                       repo->url);
1259
1260                 } else {
1261                         error("Cannot access URL %s, return code %d",
1262                               repo->url, results.curl_result);
1263                         lock_flags = 0;
1264                 }
1265         } else {
1266                 error("Unable to start PROPFIND request on %s", repo->url);
1267         }
1268
1269         strbuf_release(&out_buffer.buf);
1270         strbuf_release(&in_buffer);
1271         curl_slist_free_all(dav_headers);
1272
1273         return lock_flags;
1274 }
1275
1276 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1277 {
1278         struct object_list *entry = xmalloc(sizeof(struct object_list));
1279         entry->item = obj;
1280         entry->next = *p;
1281         *p = entry;
1282         return &entry->next;
1283 }
1284
1285 static struct object_list **process_blob(struct blob *blob,
1286                                          struct object_list **p)
1287 {
1288         struct object *obj = &blob->object;
1289
1290         obj->flags |= LOCAL;
1291
1292         if (obj->flags & (UNINTERESTING | SEEN))
1293                 return p;
1294
1295         obj->flags |= SEEN;
1296         return add_one_object(obj, p);
1297 }
1298
1299 static struct object_list **process_tree(struct tree *tree,
1300                                          struct object_list **p)
1301 {
1302         struct object *obj = &tree->object;
1303         struct tree_desc desc;
1304         struct name_entry entry;
1305
1306         obj->flags |= LOCAL;
1307
1308         if (obj->flags & (UNINTERESTING | SEEN))
1309                 return p;
1310         if (parse_tree(tree) < 0)
1311                 die("bad tree object %s", oid_to_hex(&obj->oid));
1312
1313         obj->flags |= SEEN;
1314         p = add_one_object(obj, p);
1315
1316         init_tree_desc(&desc, tree->buffer, tree->size);
1317
1318         while (tree_entry(&desc, &entry))
1319                 switch (object_type(entry.mode)) {
1320                 case OBJ_TREE:
1321                         p = process_tree(lookup_tree(the_repository, &entry.oid),
1322                                          p);
1323                         break;
1324                 case OBJ_BLOB:
1325                         p = process_blob(lookup_blob(the_repository, &entry.oid),
1326                                          p);
1327                         break;
1328                 default:
1329                         /* Subproject commit - not in this repository */
1330                         break;
1331                 }
1332
1333         free_tree_buffer(tree);
1334         return p;
1335 }
1336
1337 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1338 {
1339         int i;
1340         struct commit *commit;
1341         struct object_list **p = &objects;
1342         int count = 0;
1343
1344         while ((commit = get_revision(revs)) != NULL) {
1345                 p = process_tree(get_commit_tree(commit), p);
1346                 commit->object.flags |= LOCAL;
1347                 if (!(commit->object.flags & UNINTERESTING))
1348                         count += add_send_request(&commit->object, lock);
1349         }
1350
1351         for (i = 0; i < revs->pending.nr; i++) {
1352                 struct object_array_entry *entry = revs->pending.objects + i;
1353                 struct object *obj = entry->item;
1354                 const char *name = entry->name;
1355
1356                 if (obj->flags & (UNINTERESTING | SEEN))
1357                         continue;
1358                 if (obj->type == OBJ_TAG) {
1359                         obj->flags |= SEEN;
1360                         p = add_one_object(obj, p);
1361                         continue;
1362                 }
1363                 if (obj->type == OBJ_TREE) {
1364                         p = process_tree((struct tree *)obj, p);
1365                         continue;
1366                 }
1367                 if (obj->type == OBJ_BLOB) {
1368                         p = process_blob((struct blob *)obj, p);
1369                         continue;
1370                 }
1371                 die("unknown pending object %s (%s)", oid_to_hex(&obj->oid), name);
1372         }
1373
1374         while (objects) {
1375                 if (!(objects->item->flags & UNINTERESTING))
1376                         count += add_send_request(objects->item, lock);
1377                 objects = objects->next;
1378         }
1379
1380         return count;
1381 }
1382
1383 static int update_remote(const struct object_id *oid, struct remote_lock *lock)
1384 {
1385         struct active_request_slot *slot;
1386         struct slot_results results;
1387         struct buffer out_buffer = { STRBUF_INIT, 0 };
1388         struct curl_slist *dav_headers;
1389
1390         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1391
1392         strbuf_addf(&out_buffer.buf, "%s\n", oid_to_hex(oid));
1393
1394         slot = get_active_slot();
1395         slot->results = &results;
1396         curl_setup_http(slot->curl, lock->url, DAV_PUT,
1397                         &out_buffer, fwrite_null);
1398         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1399
1400         if (start_active_slot(slot)) {
1401                 run_active_slot(slot);
1402                 strbuf_release(&out_buffer.buf);
1403                 if (results.curl_result != CURLE_OK) {
1404                         fprintf(stderr,
1405                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1406                                 results.curl_result, results.http_code);
1407                         /* We should attempt recovery? */
1408                         return 0;
1409                 }
1410         } else {
1411                 strbuf_release(&out_buffer.buf);
1412                 fprintf(stderr, "Unable to start PUT request\n");
1413                 return 0;
1414         }
1415
1416         return 1;
1417 }
1418
1419 static struct ref *remote_refs;
1420
1421 static void one_remote_ref(const char *refname)
1422 {
1423         struct ref *ref;
1424         struct object *obj;
1425
1426         ref = alloc_ref(refname);
1427
1428         if (http_fetch_ref(repo->url, ref) != 0) {
1429                 fprintf(stderr,
1430                         "Unable to fetch ref %s from %s\n",
1431                         refname, repo->url);
1432                 free(ref);
1433                 return;
1434         }
1435
1436         /*
1437          * Fetch a copy of the object if it doesn't exist locally - it
1438          * may be required for updating server info later.
1439          */
1440         if (repo->can_update_info_refs && !has_object_file(&ref->old_oid)) {
1441                 obj = lookup_unknown_object(the_repository, &ref->old_oid);
1442                 fprintf(stderr, "  fetch %s for %s\n",
1443                         oid_to_hex(&ref->old_oid), refname);
1444                 add_fetch_request(obj);
1445         }
1446
1447         ref->next = remote_refs;
1448         remote_refs = ref;
1449 }
1450
1451 static void get_dav_remote_heads(void)
1452 {
1453         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1454 }
1455
1456 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1457 {
1458         struct strbuf *buf = (struct strbuf *)ls->userData;
1459         struct object *o;
1460         struct ref *ref;
1461
1462         ref = alloc_ref(ls->dentry_name);
1463
1464         if (http_fetch_ref(repo->url, ref) != 0) {
1465                 fprintf(stderr,
1466                         "Unable to fetch ref %s from %s\n",
1467                         ls->dentry_name, repo->url);
1468                 aborted = 1;
1469                 free(ref);
1470                 return;
1471         }
1472
1473         o = parse_object(the_repository, &ref->old_oid);
1474         if (!o) {
1475                 fprintf(stderr,
1476                         "Unable to parse object %s for remote ref %s\n",
1477                         oid_to_hex(&ref->old_oid), ls->dentry_name);
1478                 aborted = 1;
1479                 free(ref);
1480                 return;
1481         }
1482
1483         strbuf_addf(buf, "%s\t%s\n",
1484                     oid_to_hex(&ref->old_oid), ls->dentry_name);
1485
1486         if (o->type == OBJ_TAG) {
1487                 o = deref_tag(the_repository, o, ls->dentry_name, 0);
1488                 if (o)
1489                         strbuf_addf(buf, "%s\t%s^{}\n",
1490                                     oid_to_hex(&o->oid), ls->dentry_name);
1491         }
1492         free(ref);
1493 }
1494
1495 static void update_remote_info_refs(struct remote_lock *lock)
1496 {
1497         struct buffer buffer = { STRBUF_INIT, 0 };
1498         struct active_request_slot *slot;
1499         struct slot_results results;
1500         struct curl_slist *dav_headers;
1501
1502         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1503                   add_remote_info_ref, &buffer.buf);
1504         if (!aborted) {
1505                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1506
1507                 slot = get_active_slot();
1508                 slot->results = &results;
1509                 curl_setup_http(slot->curl, lock->url, DAV_PUT,
1510                                 &buffer, fwrite_null);
1511                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1512
1513                 if (start_active_slot(slot)) {
1514                         run_active_slot(slot);
1515                         if (results.curl_result != CURLE_OK) {
1516                                 fprintf(stderr,
1517                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1518                                         results.curl_result, results.http_code);
1519                         }
1520                 }
1521         }
1522         strbuf_release(&buffer.buf);
1523 }
1524
1525 static int remote_exists(const char *path)
1526 {
1527         char *url = xstrfmt("%s%s", repo->url, path);
1528         int ret;
1529
1530
1531         switch (http_get_strbuf(url, NULL, NULL)) {
1532         case HTTP_OK:
1533                 ret = 1;
1534                 break;
1535         case HTTP_MISSING_TARGET:
1536                 ret = 0;
1537                 break;
1538         case HTTP_ERROR:
1539                 error("unable to access '%s': %s", url, curl_errorstr);
1540                 /* fallthrough */
1541         default:
1542                 ret = -1;
1543         }
1544         free(url);
1545         return ret;
1546 }
1547
1548 static void fetch_symref(const char *path, char **symref, struct object_id *oid)
1549 {
1550         char *url = xstrfmt("%s%s", repo->url, path);
1551         struct strbuf buffer = STRBUF_INIT;
1552         const char *name;
1553
1554         if (http_get_strbuf(url, &buffer, NULL) != HTTP_OK)
1555                 die("Couldn't get %s for remote symref\n%s", url,
1556                     curl_errorstr);
1557         free(url);
1558
1559         FREE_AND_NULL(*symref);
1560         oidclr(oid);
1561
1562         if (buffer.len == 0)
1563                 return;
1564
1565         /* Cut off trailing newline. */
1566         strbuf_rtrim(&buffer);
1567
1568         /* If it's a symref, set the refname; otherwise try for a sha1 */
1569         if (skip_prefix(buffer.buf, "ref: ", &name)) {
1570                 *symref = xmemdupz(name, buffer.len - (name - buffer.buf));
1571         } else {
1572                 get_oid_hex(buffer.buf, oid);
1573         }
1574
1575         strbuf_release(&buffer);
1576 }
1577
1578 static int verify_merge_base(struct object_id *head_oid, struct ref *remote)
1579 {
1580         struct commit *head = lookup_commit_or_die(head_oid, "HEAD");
1581         struct commit *branch = lookup_commit_or_die(&remote->old_oid,
1582                                                      remote->name);
1583
1584         return in_merge_bases(branch, head);
1585 }
1586
1587 static int delete_remote_branch(const char *pattern, int force)
1588 {
1589         struct ref *refs = remote_refs;
1590         struct ref *remote_ref = NULL;
1591         struct object_id head_oid;
1592         char *symref = NULL;
1593         int match;
1594         int patlen = strlen(pattern);
1595         int i;
1596         struct active_request_slot *slot;
1597         struct slot_results results;
1598         char *url;
1599
1600         /* Find the remote branch(es) matching the specified branch name */
1601         for (match = 0; refs; refs = refs->next) {
1602                 char *name = refs->name;
1603                 int namelen = strlen(name);
1604                 if (namelen < patlen ||
1605                     memcmp(name + namelen - patlen, pattern, patlen))
1606                         continue;
1607                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1608                         continue;
1609                 match++;
1610                 remote_ref = refs;
1611         }
1612         if (match == 0)
1613                 return error("No remote branch matches %s", pattern);
1614         if (match != 1)
1615                 return error("More than one remote branch matches %s",
1616                              pattern);
1617
1618         /*
1619          * Remote HEAD must be a symref (not exactly foolproof; a remote
1620          * symlink to a symref will look like a symref)
1621          */
1622         fetch_symref("HEAD", &symref, &head_oid);
1623         if (!symref)
1624                 return error("Remote HEAD is not a symref");
1625
1626         /* Remote branch must not be the remote HEAD */
1627         for (i = 0; symref && i < MAXDEPTH; i++) {
1628                 if (!strcmp(remote_ref->name, symref))
1629                         return error("Remote branch %s is the current HEAD",
1630                                      remote_ref->name);
1631                 fetch_symref(symref, &symref, &head_oid);
1632         }
1633
1634         /* Run extra sanity checks if delete is not forced */
1635         if (!force) {
1636                 /* Remote HEAD must resolve to a known object */
1637                 if (symref)
1638                         return error("Remote HEAD symrefs too deep");
1639                 if (is_null_oid(&head_oid))
1640                         return error("Unable to resolve remote HEAD");
1641                 if (!has_object_file(&head_oid))
1642                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", oid_to_hex(&head_oid));
1643
1644                 /* Remote branch must resolve to a known object */
1645                 if (is_null_oid(&remote_ref->old_oid))
1646                         return error("Unable to resolve remote branch %s",
1647                                      remote_ref->name);
1648                 if (!has_object_file(&remote_ref->old_oid))
1649                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, oid_to_hex(&remote_ref->old_oid));
1650
1651                 /* Remote branch must be an ancestor of remote HEAD */
1652                 if (!verify_merge_base(&head_oid, remote_ref)) {
1653                         return error("The branch '%s' is not an ancestor "
1654                                      "of your current HEAD.\n"
1655                                      "If you are sure you want to delete it,"
1656                                      " run:\n\t'git http-push -D %s %s'",
1657                                      remote_ref->name, repo->url, pattern);
1658                 }
1659         }
1660
1661         /* Send delete request */
1662         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1663         if (dry_run)
1664                 return 0;
1665         url = xstrfmt("%s%s", repo->url, remote_ref->name);
1666         slot = get_active_slot();
1667         slot->results = &results;
1668         curl_setup_http_get(slot->curl, url, DAV_DELETE);
1669         if (start_active_slot(slot)) {
1670                 run_active_slot(slot);
1671                 free(url);
1672                 if (results.curl_result != CURLE_OK)
1673                         return error("DELETE request failed (%d/%ld)",
1674                                      results.curl_result, results.http_code);
1675         } else {
1676                 free(url);
1677                 return error("Unable to start DELETE request");
1678         }
1679
1680         return 0;
1681 }
1682
1683 static void run_request_queue(void)
1684 {
1685 #ifdef USE_CURL_MULTI
1686         is_running_queue = 1;
1687         fill_active_slots();
1688         add_fill_function(NULL, fill_active_slot);
1689 #endif
1690         do {
1691                 finish_all_active_slots();
1692 #ifdef USE_CURL_MULTI
1693                 fill_active_slots();
1694 #endif
1695         } while (request_queue_head && !aborted);
1696
1697 #ifdef USE_CURL_MULTI
1698         is_running_queue = 0;
1699 #endif
1700 }
1701
1702 int cmd_main(int argc, const char **argv)
1703 {
1704         struct transfer_request *request;
1705         struct transfer_request *next_request;
1706         struct refspec rs = REFSPEC_INIT_PUSH;
1707         struct remote_lock *ref_lock = NULL;
1708         struct remote_lock *info_ref_lock = NULL;
1709         struct rev_info revs;
1710         int delete_branch = 0;
1711         int force_delete = 0;
1712         int objects_to_send;
1713         int rc = 0;
1714         int i;
1715         int new_refs;
1716         struct ref *ref, *local_refs;
1717
1718         CALLOC_ARRAY(repo, 1);
1719
1720         argv++;
1721         for (i = 1; i < argc; i++, argv++) {
1722                 const char *arg = *argv;
1723
1724                 if (*arg == '-') {
1725                         if (!strcmp(arg, "--all")) {
1726                                 push_all = MATCH_REFS_ALL;
1727                                 continue;
1728                         }
1729                         if (!strcmp(arg, "--force")) {
1730                                 force_all = 1;
1731                                 continue;
1732                         }
1733                         if (!strcmp(arg, "--dry-run")) {
1734                                 dry_run = 1;
1735                                 continue;
1736                         }
1737                         if (!strcmp(arg, "--helper-status")) {
1738                                 helper_status = 1;
1739                                 continue;
1740                         }
1741                         if (!strcmp(arg, "--verbose")) {
1742                                 push_verbosely = 1;
1743                                 http_is_verbose = 1;
1744                                 continue;
1745                         }
1746                         if (!strcmp(arg, "-d")) {
1747                                 delete_branch = 1;
1748                                 continue;
1749                         }
1750                         if (!strcmp(arg, "-D")) {
1751                                 delete_branch = 1;
1752                                 force_delete = 1;
1753                                 continue;
1754                         }
1755                         if (!strcmp(arg, "-h"))
1756                                 usage(http_push_usage);
1757                 }
1758                 if (!repo->url) {
1759                         char *path = strstr(arg, "//");
1760                         str_end_url_with_slash(arg, &repo->url);
1761                         repo->path_len = strlen(repo->url);
1762                         if (path) {
1763                                 repo->path = strchr(path+2, '/');
1764                                 if (repo->path)
1765                                         repo->path_len = strlen(repo->path);
1766                         }
1767                         continue;
1768                 }
1769                 refspec_appendn(&rs, argv, argc - i);
1770                 break;
1771         }
1772
1773 #ifndef USE_CURL_MULTI
1774         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1775 #endif
1776
1777         if (!repo->url)
1778                 usage(http_push_usage);
1779
1780         if (delete_branch && rs.nr != 1)
1781                 die("You must specify only one branch name when deleting a remote branch");
1782
1783         setup_git_directory();
1784
1785         memset(remote_dir_exists, -1, 256);
1786
1787         http_init(NULL, repo->url, 1);
1788
1789 #ifdef USE_CURL_MULTI
1790         is_running_queue = 0;
1791 #endif
1792
1793         /* Verify DAV compliance/lock support */
1794         if (!locking_available()) {
1795                 rc = 1;
1796                 goto cleanup;
1797         }
1798
1799         sigchain_push_common(remove_locks_on_signal);
1800
1801         /* Check whether the remote has server info files */
1802         repo->can_update_info_refs = 0;
1803         repo->has_info_refs = remote_exists("info/refs");
1804         repo->has_info_packs = remote_exists("objects/info/packs");
1805         if (repo->has_info_refs) {
1806                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1807                 if (info_ref_lock)
1808                         repo->can_update_info_refs = 1;
1809                 else {
1810                         error("cannot lock existing info/refs");
1811                         rc = 1;
1812                         goto cleanup;
1813                 }
1814         }
1815         if (repo->has_info_packs)
1816                 fetch_indices();
1817
1818         /* Get a list of all local and remote heads to validate refspecs */
1819         local_refs = get_local_heads();
1820         fprintf(stderr, "Fetching remote heads...\n");
1821         get_dav_remote_heads();
1822         run_request_queue();
1823
1824         /* Remove a remote branch if -d or -D was specified */
1825         if (delete_branch) {
1826                 const char *branch = rs.items[i].src;
1827                 if (delete_remote_branch(branch, force_delete) == -1) {
1828                         fprintf(stderr, "Unable to delete remote branch %s\n",
1829                                 branch);
1830                         if (helper_status)
1831                                 printf("error %s cannot remove\n", branch);
1832                 }
1833                 goto cleanup;
1834         }
1835
1836         /* match them up */
1837         if (match_push_refs(local_refs, &remote_refs, &rs, push_all)) {
1838                 rc = -1;
1839                 goto cleanup;
1840         }
1841         if (!remote_refs) {
1842                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1843                 if (helper_status)
1844                         printf("error null no match\n");
1845                 rc = 0;
1846                 goto cleanup;
1847         }
1848
1849         new_refs = 0;
1850         for (ref = remote_refs; ref; ref = ref->next) {
1851                 struct strvec commit_argv = STRVEC_INIT;
1852
1853                 if (!ref->peer_ref)
1854                         continue;
1855
1856                 if (is_null_oid(&ref->peer_ref->new_oid)) {
1857                         if (delete_remote_branch(ref->name, 1) == -1) {
1858                                 error("Could not remove %s", ref->name);
1859                                 if (helper_status)
1860                                         printf("error %s cannot remove\n", ref->name);
1861                                 rc = -4;
1862                         }
1863                         else if (helper_status)
1864                                 printf("ok %s\n", ref->name);
1865                         new_refs++;
1866                         continue;
1867                 }
1868
1869                 if (oideq(&ref->old_oid, &ref->peer_ref->new_oid)) {
1870                         if (push_verbosely)
1871                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1872                         if (helper_status)
1873                                 printf("ok %s up to date\n", ref->name);
1874                         continue;
1875                 }
1876
1877                 if (!force_all &&
1878                     !is_null_oid(&ref->old_oid) &&
1879                     !ref->force) {
1880                         if (!has_object_file(&ref->old_oid) ||
1881                             !ref_newer(&ref->peer_ref->new_oid,
1882                                        &ref->old_oid)) {
1883                                 /*
1884                                  * We do not have the remote ref, or
1885                                  * we know that the remote ref is not
1886                                  * an ancestor of what we are trying to
1887                                  * push.  Either way this can be losing
1888                                  * commits at the remote end and likely
1889                                  * we were not up to date to begin with.
1890                                  */
1891                                 error("remote '%s' is not an ancestor of\n"
1892                                       "local '%s'.\n"
1893                                       "Maybe you are not up-to-date and "
1894                                       "need to pull first?",
1895                                       ref->name,
1896                                       ref->peer_ref->name);
1897                                 if (helper_status)
1898                                         printf("error %s non-fast forward\n", ref->name);
1899                                 rc = -2;
1900                                 continue;
1901                         }
1902                 }
1903                 oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
1904                 new_refs++;
1905
1906                 fprintf(stderr, "updating '%s'", ref->name);
1907                 if (strcmp(ref->name, ref->peer_ref->name))
1908                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
1909                 fprintf(stderr, "\n  from %s\n  to   %s\n",
1910                         oid_to_hex(&ref->old_oid), oid_to_hex(&ref->new_oid));
1911                 if (dry_run) {
1912                         if (helper_status)
1913                                 printf("ok %s\n", ref->name);
1914                         continue;
1915                 }
1916
1917                 /* Lock remote branch ref */
1918                 ref_lock = lock_remote(ref->name, LOCK_TIME);
1919                 if (ref_lock == NULL) {
1920                         fprintf(stderr, "Unable to lock remote branch %s\n",
1921                                 ref->name);
1922                         if (helper_status)
1923                                 printf("error %s lock error\n", ref->name);
1924                         rc = 1;
1925                         continue;
1926                 }
1927
1928                 /* Set up revision info for this refspec */
1929                 strvec_push(&commit_argv, ""); /* ignored */
1930                 strvec_push(&commit_argv, "--objects");
1931                 strvec_push(&commit_argv, oid_to_hex(&ref->new_oid));
1932                 if (!push_all && !is_null_oid(&ref->old_oid))
1933                         strvec_pushf(&commit_argv, "^%s",
1934                                      oid_to_hex(&ref->old_oid));
1935                 repo_init_revisions(the_repository, &revs, setup_git_directory());
1936                 setup_revisions(commit_argv.nr, commit_argv.v, &revs, NULL);
1937                 revs.edge_hint = 0; /* just in case */
1938
1939                 /* Generate a list of objects that need to be pushed */
1940                 pushing = 0;
1941                 if (prepare_revision_walk(&revs))
1942                         die("revision walk setup failed");
1943                 mark_edges_uninteresting(&revs, NULL, 0);
1944                 objects_to_send = get_delta(&revs, ref_lock);
1945                 finish_all_active_slots();
1946
1947                 /* Push missing objects to remote, this would be a
1948                    convenient time to pack them first if appropriate. */
1949                 pushing = 1;
1950                 if (objects_to_send)
1951                         fprintf(stderr, "    sending %d objects\n",
1952                                 objects_to_send);
1953
1954                 run_request_queue();
1955
1956                 /* Update the remote branch if all went well */
1957                 if (aborted || !update_remote(&ref->new_oid, ref_lock))
1958                         rc = 1;
1959
1960                 if (!rc)
1961                         fprintf(stderr, "    done\n");
1962                 if (helper_status)
1963                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
1964                 unlock_remote(ref_lock);
1965                 check_locks();
1966                 strvec_clear(&commit_argv);
1967         }
1968
1969         /* Update remote server info if appropriate */
1970         if (repo->has_info_refs && new_refs) {
1971                 if (info_ref_lock && repo->can_update_info_refs) {
1972                         fprintf(stderr, "Updating remote server info\n");
1973                         if (!dry_run)
1974                                 update_remote_info_refs(info_ref_lock);
1975                 } else {
1976                         fprintf(stderr, "Unable to update server info\n");
1977                 }
1978         }
1979
1980  cleanup:
1981         if (info_ref_lock)
1982                 unlock_remote(info_ref_lock);
1983         free(repo);
1984
1985         http_cleanup();
1986
1987         request = request_queue_head;
1988         while (request != NULL) {
1989                 next_request = request->next;
1990                 release_request(request);
1991                 request = next_request;
1992         }
1993
1994         return rc;
1995 }