http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5 #include "tag.h"
   6 #include "blob.h"
   7 #include "http.h"
   8 #include "refs.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "exec_cmd.h"
  12
  13 #include <expat.h>
  14
  15 static const char http_push_usage[] =
  16 "git-http-push [--all] [--force] [--verbose] <remote> [<head>...]\n";
  17
  18 #ifndef XML_STATUS_OK
  19 enum XML_Status {
  20   XML_STATUS_OK = 1,
  21   XML_STATUS_ERROR = 0
  22 };
  23 #define XML_STATUS_OK    1
  24 #define XML_STATUS_ERROR 0
  25 #endif
  26
  27 #define PREV_BUF_SIZE 4096
  28 #define RANGE_HEADER_SIZE 30
  29
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #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>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #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>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing = 0;
  74 static int aborted = 0;
  75 static signed char remote_dir_exists[256];
  76
  77 static struct curl_slist *no_pragma_header;
  78 static struct curl_slist *default_headers;
  79
  80 static int push_verbosely = 0;
  81 static int push_all = 0;
  82 static int force_all = 0;
  83
  84 static struct object_list *objects = NULL;
  85
  86 struct repo
  87 {
  88         char *url;
  89         int path_len;
  90         int has_info_refs;
  91         int can_update_info_refs;
  92         int has_info_packs;
  93         struct packed_git *packs;
  94         struct remote_lock *locks;
  95 };
  96
  97 static struct repo *remote = NULL;
  98
  99 enum transfer_state {
 100         NEED_FETCH,
 101         RUN_FETCH_LOOSE,
 102         RUN_FETCH_PACKED,
 103         NEED_PUSH,
 104         RUN_MKCOL,
 105         RUN_PUT,
 106         RUN_MOVE,
 107         ABORTED,
 108         COMPLETE,
 109 };
 110
 111 struct transfer_request
 112 {
 113         struct object *obj;
 114         char *url;
 115         char *dest;
 116         struct remote_lock *lock;
 117         struct curl_slist *headers;
 118         struct buffer buffer;
 119         char filename[PATH_MAX];
 120         char tmpfile[PATH_MAX];
 121         int local_fileno;
 122         FILE *local_stream;
 123         enum transfer_state state;
 124         CURLcode curl_result;
 125         char errorstr[CURL_ERROR_SIZE];
 126         long http_code;
 127         unsigned char real_sha1[20];
 128         SHA_CTX c;
 129         z_stream stream;
 130         int zret;
 131         int rename;
 132         void *userData;
 133         struct active_request_slot *slot;
 134         struct transfer_request *next;
 135 };
 136
 137 static struct transfer_request *request_queue_head = NULL;
 138
 139 struct xml_ctx
 140 {
 141         char *name;
 142         int len;
 143         char *cdata;
 144         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 145         void *userData;
 146 };
 147
 148 struct remote_lock
 149 {
 150         char *url;
 151         char *owner;
 152         char *token;
 153         time_t start_time;
 154         long timeout;
 155         int refreshing;
 156         struct remote_lock *next;
 157 };
 158
 159 /* Flags that control remote_ls processing */
 160 #define PROCESS_FILES (1u << 0)
 161 #define PROCESS_DIRS  (1u << 1)
 162 #define RECURSIVE     (1u << 2)
 163
 164 /* Flags that remote_ls passes to callback functions */
 165 #define IS_DIR (1u << 0)
 166
 167 struct remote_ls_ctx
 168 {
 169         char *path;
 170         void (*userFunc)(struct remote_ls_ctx *ls);
 171         void *userData;
 172         int flags;
 173         char *dentry_name;
 174         int dentry_flags;
 175         struct remote_ls_ctx *parent;
 176 };
 177
 178 static void finish_request(struct transfer_request *request);
 179 static void release_request(struct transfer_request *request);
 180
 181 static void process_response(void *callback_data)
 182 {
 183         struct transfer_request *request =
 184                 (struct transfer_request *)callback_data;
 185
 186         finish_request(request);
 187 }
 188
 189 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 190                                void *data)
 191 {
 192         unsigned char expn[4096];
 193         size_t size = eltsize * nmemb;
 194         int posn = 0;
 195         struct transfer_request *request = (struct transfer_request *)data;
 196         do {
 197                 ssize_t retval = write(request->local_fileno,
 198                                        ptr + posn, size - posn);
 199                 if (retval < 0)
 200                         return posn;
 201                 posn += retval;
 202         } while (posn < size);
 203
 204         request->stream.avail_in = size;
 205         request->stream.next_in = ptr;
 206         do {
 207                 request->stream.next_out = expn;
 208                 request->stream.avail_out = sizeof(expn);
 209                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 210                 SHA1_Update(&request->c, expn,
 211                             sizeof(expn) - request->stream.avail_out);
 212         } while (request->stream.avail_in && request->zret == Z_OK);
 213         data_received++;
 214         return size;
 215 }
 216
 217 static void start_fetch_loose(struct transfer_request *request)
 218 {
 219         char *hex = sha1_to_hex(request->obj->sha1);
 220         char *filename;
 221         char prevfile[PATH_MAX];
 222         char *url;
 223         char *posn;
 224         int prevlocal;
 225         unsigned char prev_buf[PREV_BUF_SIZE];
 226         ssize_t prev_read = 0;
 227         long prev_posn = 0;
 228         char range[RANGE_HEADER_SIZE];
 229         struct curl_slist *range_header = NULL;
 230         struct active_request_slot *slot;
 231
 232         filename = sha1_file_name(request->obj->sha1);
 233         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 234         snprintf(request->tmpfile, sizeof(request->tmpfile),
 235                  "%s.temp", filename);
 236
 237         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 238         unlink(prevfile);
 239         rename(request->tmpfile, prevfile);
 240         unlink(request->tmpfile);
 241
 242         if (request->local_fileno != -1)
 243                 error("fd leakage in start: %d", request->local_fileno);
 244         request->local_fileno = open(request->tmpfile,
 245                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 246         /* This could have failed due to the "lazy directory creation";
 247          * try to mkdir the last path component.
 248          */
 249         if (request->local_fileno < 0 && errno == ENOENT) {
 250                 char *dir = strrchr(request->tmpfile, '/');
 251                 if (dir) {
 252                         *dir = 0;
 253                         mkdir(request->tmpfile, 0777);
 254                         *dir = '/';
 255                 }
 256                 request->local_fileno = open(request->tmpfile,
 257                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 258         }
 259
 260         if (request->local_fileno < 0) {
 261                 request->state = ABORTED;
 262                 error("Couldn't create temporary file %s for %s: %s",
 263                       request->tmpfile, request->filename, strerror(errno));
 264                 return;
 265         }
 266
 267         memset(&request->stream, 0, sizeof(request->stream));
 268
 269         inflateInit(&request->stream);
 270
 271         SHA1_Init(&request->c);
 272
 273         url = xmalloc(strlen(remote->url) + 50);
 274         request->url = xmalloc(strlen(remote->url) + 50);
 275         strcpy(url, remote->url);
 276         posn = url + strlen(remote->url);
 277         strcpy(posn, "objects/");
 278         posn += 8;
 279         memcpy(posn, hex, 2);
 280         posn += 2;
 281         *(posn++) = '/';
 282         strcpy(posn, hex + 2);
 283         strcpy(request->url, url);
 284
 285         /* If a previous temp file is present, process what was already
 286            fetched. */
 287         prevlocal = open(prevfile, O_RDONLY);
 288         if (prevlocal != -1) {
 289                 do {
 290                         prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
 291                         if (prev_read>0) {
 292                                 if (fwrite_sha1_file(prev_buf,
 293                                                      1,
 294                                                      prev_read,
 295                                                      request) == prev_read) {
 296                                         prev_posn += prev_read;
 297                                 } else {
 298                                         prev_read = -1;
 299                                 }
 300                         }
 301                 } while (prev_read > 0);
 302                 close(prevlocal);
 303         }
 304         unlink(prevfile);
 305
 306         /* Reset inflate/SHA1 if there was an error reading the previous temp
 307            file; also rewind to the beginning of the local file. */
 308         if (prev_read == -1) {
 309                 memset(&request->stream, 0, sizeof(request->stream));
 310                 inflateInit(&request->stream);
 311                 SHA1_Init(&request->c);
 312                 if (prev_posn>0) {
 313                         prev_posn = 0;
 314                         lseek(request->local_fileno, SEEK_SET, 0);
 315                         ftruncate(request->local_fileno, 0);
 316                 }
 317         }
 318
 319         slot = get_active_slot();
 320         slot->callback_func = process_response;
 321         slot->callback_data = request;
 322         request->slot = slot;
 323
 324         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 325         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 326         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 327         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 328         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 329
 330         /* If we have successfully processed data from a previous fetch
 331            attempt, only fetch the data we don't already have. */
 332         if (prev_posn>0) {
 333                 if (push_verbosely)
 334                         fprintf(stderr,
 335                                 "Resuming fetch of object %s at byte %ld\n",
 336                                 hex, prev_posn);
 337                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 338                 range_header = curl_slist_append(range_header, range);
 339                 curl_easy_setopt(slot->curl,
 340                                  CURLOPT_HTTPHEADER, range_header);
 341         }
 342
 343         /* Try to get the request started, abort the request on error */
 344         request->state = RUN_FETCH_LOOSE;
 345         if (!start_active_slot(slot)) {
 346                 fprintf(stderr, "Unable to start GET request\n");
 347                 remote->can_update_info_refs = 0;
 348                 release_request(request);
 349         }
 350 }
 351
 352 static void start_fetch_packed(struct transfer_request *request)
 353 {
 354         char *url;
 355         struct packed_git *target;
 356         FILE *packfile;
 357         char *filename;
 358         long prev_posn = 0;
 359         char range[RANGE_HEADER_SIZE];
 360         struct curl_slist *range_header = NULL;
 361
 362         struct transfer_request *check_request = request_queue_head;
 363         struct active_request_slot *slot;
 364
 365         target = find_sha1_pack(request->obj->sha1, remote->packs);
 366         if (!target) {
 367                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 368                 remote->can_update_info_refs = 0;
 369                 release_request(request);
 370                 return;
 371         }
 372
 373         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 374         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 375
 376         filename = sha1_pack_name(target->sha1);
 377         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 378         snprintf(request->tmpfile, sizeof(request->tmpfile),
 379                  "%s.temp", filename);
 380
 381         url = xmalloc(strlen(remote->url) + 64);
 382         sprintf(url, "%sobjects/pack/pack-%s.pack",
 383                 remote->url, sha1_to_hex(target->sha1));
 384
 385         /* Make sure there isn't another open request for this pack */
 386         while (check_request) {
 387                 if (check_request->state == RUN_FETCH_PACKED &&
 388                     !strcmp(check_request->url, url)) {
 389                         free(url);
 390                         release_request(request);
 391                         return;
 392                 }
 393                 check_request = check_request->next;
 394         }
 395
 396         packfile = fopen(request->tmpfile, "a");
 397         if (!packfile) {
 398                 fprintf(stderr, "Unable to open local file %s for pack",
 399                         filename);
 400                 remote->can_update_info_refs = 0;
 401                 free(url);
 402                 return;
 403         }
 404
 405         slot = get_active_slot();
 406         slot->callback_func = process_response;
 407         slot->callback_data = request;
 408         request->slot = slot;
 409         request->local_stream = packfile;
 410         request->userData = target;
 411
 412         request->url = url;
 413         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 414         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 415         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 416         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 417         slot->local = packfile;
 418
 419         /* If there is data present from a previous transfer attempt,
 420            resume where it left off */
 421         prev_posn = ftell(packfile);
 422         if (prev_posn>0) {
 423                 if (push_verbosely)
 424                         fprintf(stderr,
 425                                 "Resuming fetch of pack %s at byte %ld\n",
 426                                 sha1_to_hex(target->sha1), prev_posn);
 427                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 428                 range_header = curl_slist_append(range_header, range);
 429                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 430         }
 431
 432         /* Try to get the request started, abort the request on error */
 433         request->state = RUN_FETCH_PACKED;
 434         if (!start_active_slot(slot)) {
 435                 fprintf(stderr, "Unable to start GET request\n");
 436                 remote->can_update_info_refs = 0;
 437                 release_request(request);
 438         }
 439 }
 440
 441 static void start_mkcol(struct transfer_request *request)
 442 {
 443         char *hex = sha1_to_hex(request->obj->sha1);
 444         struct active_request_slot *slot;
 445         char *posn;
 446
 447         request->url = xmalloc(strlen(remote->url) + 13);
 448         strcpy(request->url, remote->url);
 449         posn = request->url + strlen(remote->url);
 450         strcpy(posn, "objects/");
 451         posn += 8;
 452         memcpy(posn, hex, 2);
 453         posn += 2;
 454         strcpy(posn, "/");
 455
 456         slot = get_active_slot();
 457         slot->callback_func = process_response;
 458         slot->callback_data = request;
 459         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 460         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 461         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 462         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 463         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 464
 465         if (start_active_slot(slot)) {
 466                 request->slot = slot;
 467                 request->state = RUN_MKCOL;
 468         } else {
 469                 request->state = ABORTED;
 470                 free(request->url);
 471                 request->url = NULL;
 472         }
 473 }
 474
 475 static void start_put(struct transfer_request *request)
 476 {
 477         char *hex = sha1_to_hex(request->obj->sha1);
 478         struct active_request_slot *slot;
 479         char *posn;
 480         char type[20];
 481         char hdr[50];
 482         void *unpacked;
 483         unsigned long len;
 484         int hdrlen;
 485         ssize_t size;
 486         z_stream stream;
 487
 488         unpacked = read_sha1_file(request->obj->sha1, type, &len);
 489         hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 490
 491         /* Set it up */
 492         memset(&stream, 0, sizeof(stream));
 493         deflateInit(&stream, Z_BEST_COMPRESSION);
 494         size = deflateBound(&stream, len + hdrlen);
 495         request->buffer.buffer = xmalloc(size);
 496
 497         /* Compress it */
 498         stream.next_out = request->buffer.buffer;
 499         stream.avail_out = size;
 500
 501         /* First header.. */
 502         stream.next_in = (void *)hdr;
 503         stream.avail_in = hdrlen;
 504         while (deflate(&stream, 0) == Z_OK)
 505                 /* nothing */;
 506
 507         /* Then the data itself.. */
 508         stream.next_in = unpacked;
 509         stream.avail_in = len;
 510         while (deflate(&stream, Z_FINISH) == Z_OK)
 511                 /* nothing */;
 512         deflateEnd(&stream);
 513         free(unpacked);
 514
 515         request->buffer.size = stream.total_out;
 516         request->buffer.posn = 0;
 517
 518         request->url = xmalloc(strlen(remote->url) +
 519                                strlen(request->lock->token) + 51);
 520         strcpy(request->url, remote->url);
 521         posn = request->url + strlen(remote->url);
 522         strcpy(posn, "objects/");
 523         posn += 8;
 524         memcpy(posn, hex, 2);
 525         posn += 2;
 526         *(posn++) = '/';
 527         strcpy(posn, hex + 2);
 528         request->dest = xmalloc(strlen(request->url) + 14);
 529         sprintf(request->dest, "Destination: %s", request->url);
 530         posn += 38;
 531         *(posn++) = '.';
 532         strcpy(posn, request->lock->token);
 533
 534         slot = get_active_slot();
 535         slot->callback_func = process_response;
 536         slot->callback_data = request;
 537         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 538         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 539         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 540         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 541         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 542         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 543         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 544         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 545         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 546
 547         if (start_active_slot(slot)) {
 548                 request->slot = slot;
 549                 request->state = RUN_PUT;
 550         } else {
 551                 request->state = ABORTED;
 552                 free(request->url);
 553                 request->url = NULL;
 554         }
 555 }
 556
 557 static void start_move(struct transfer_request *request)
 558 {
 559         struct active_request_slot *slot;
 560         struct curl_slist *dav_headers = NULL;
 561
 562         slot = get_active_slot();
 563         slot->callback_func = process_response;
 564         slot->callback_data = request;
 565         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 566         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 567         dav_headers = curl_slist_append(dav_headers, request->dest);
 568         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 569         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 571         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 572
 573         if (start_active_slot(slot)) {
 574                 request->slot = slot;
 575                 request->state = RUN_MOVE;
 576         } else {
 577                 request->state = ABORTED;
 578                 free(request->url);
 579                 request->url = NULL;
 580         }
 581 }
 582
 583 static int refresh_lock(struct remote_lock *lock)
 584 {
 585         struct active_request_slot *slot;
 586         struct slot_results results;
 587         char *if_header;
 588         char timeout_header[25];
 589         struct curl_slist *dav_headers = NULL;
 590         int rc = 0;
 591
 592         lock->refreshing = 1;
 593
 594         if_header = xmalloc(strlen(lock->token) + 25);
 595         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 596         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 597         dav_headers = curl_slist_append(dav_headers, if_header);
 598         dav_headers = curl_slist_append(dav_headers, timeout_header);
 599
 600         slot = get_active_slot();
 601         slot->results = &results;
 602         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 603         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 604         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 605         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 606         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 607
 608         if (start_active_slot(slot)) {
 609                 run_active_slot(slot);
 610                 if (results.curl_result != CURLE_OK) {
 611                         fprintf(stderr, "LOCK HTTP error %ld\n",
 612                                 results.http_code);
 613                 } else {
 614                         lock->start_time = time(NULL);
 615                         rc = 1;
 616                 }
 617         }
 618
 619         lock->refreshing = 0;
 620         curl_slist_free_all(dav_headers);
 621         free(if_header);
 622
 623         return rc;
 624 }
 625
 626 static void check_locks(void)
 627 {
 628         struct remote_lock *lock = remote->locks;
 629         time_t current_time = time(NULL);
 630         int time_remaining;
 631
 632         while (lock) {
 633                 time_remaining = lock->start_time + lock->timeout -
 634                         current_time;
 635                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 636                         if (!refresh_lock(lock)) {
 637                                 fprintf(stderr,
 638                                         "Unable to refresh lock for %s\n",
 639                                         lock->url);
 640                                 aborted = 1;
 641                                 return;
 642                         }
 643                 }
 644                 lock = lock->next;
 645         }
 646 }
 647
 648 static void release_request(struct transfer_request *request)
 649 {
 650         struct transfer_request *entry = request_queue_head;
 651
 652         if (request == request_queue_head) {
 653                 request_queue_head = request->next;
 654         } else {
 655                 while (entry->next != NULL && entry->next != request)
 656                         entry = entry->next;
 657                 if (entry->next == request)
 658                         entry->next = entry->next->next;
 659         }
 660
 661         if (request->local_fileno != -1)
 662                 close(request->local_fileno);
 663         if (request->local_stream)
 664                 fclose(request->local_stream);
 665         if (request->url != NULL)
 666                 free(request->url);
 667         free(request);
 668 }
 669
 670 static void finish_request(struct transfer_request *request)
 671 {
 672         struct stat st;
 673         struct packed_git *target;
 674         struct packed_git **lst;
 675
 676         request->curl_result = request->slot->curl_result;
 677         request->http_code = request->slot->http_code;
 678         request->slot = NULL;
 679
 680         /* Keep locks active */
 681         check_locks();
 682
 683         if (request->headers != NULL)
 684                 curl_slist_free_all(request->headers);
 685
 686         /* URL is reused for MOVE after PUT */
 687         if (request->state != RUN_PUT) {
 688                 free(request->url);
 689                 request->url = NULL;
 690         }
 691
 692         if (request->state == RUN_MKCOL) {
 693                 if (request->curl_result == CURLE_OK ||
 694                     request->http_code == 405) {
 695                         remote_dir_exists[request->obj->sha1[0]] = 1;
 696                         start_put(request);
 697                 } else {
 698                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 699                                 sha1_to_hex(request->obj->sha1),
 700                                 request->curl_result, request->http_code);
 701                         request->state = ABORTED;
 702                         aborted = 1;
 703                 }
 704         } else if (request->state == RUN_PUT) {
 705                 if (request->curl_result == CURLE_OK) {
 706                         start_move(request);
 707                 } else {
 708                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 709                                 sha1_to_hex(request->obj->sha1),
 710                                 request->curl_result, request->http_code);
 711                         request->state = ABORTED;
 712                         aborted = 1;
 713                 }
 714         } else if (request->state == RUN_MOVE) {
 715                 if (request->curl_result == CURLE_OK) {
 716                         if (push_verbosely)
 717                                 fprintf(stderr, "    sent %s\n",
 718                                         sha1_to_hex(request->obj->sha1));
 719                         request->obj->flags |= REMOTE;
 720                         release_request(request);
 721                 } else {
 722                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 723                                 sha1_to_hex(request->obj->sha1),
 724                                 request->curl_result, request->http_code);
 725                         request->state = ABORTED;
 726                         aborted = 1;
 727                 }
 728         } else if (request->state == RUN_FETCH_LOOSE) {
 729                 fchmod(request->local_fileno, 0444);
 730                 close(request->local_fileno); request->local_fileno = -1;
 731
 732                 if (request->curl_result != CURLE_OK &&
 733                     request->http_code != 416) {
 734                         if (stat(request->tmpfile, &st) == 0) {
 735                                 if (st.st_size == 0)
 736                                         unlink(request->tmpfile);
 737                         }
 738                 } else {
 739                         if (request->http_code == 416)
 740                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 741
 742                         inflateEnd(&request->stream);
 743                         SHA1_Final(request->real_sha1, &request->c);
 744                         if (request->zret != Z_STREAM_END) {
 745                                 unlink(request->tmpfile);
 746                         } else if (memcmp(request->obj->sha1, request->real_sha1, 20)) {
 747                                 unlink(request->tmpfile);
 748                         } else {
 749                                 request->rename =
 750                                         move_temp_to_file(
 751                                                 request->tmpfile,
 752                                                 request->filename);
 753                                 if (request->rename == 0) {
 754                                         request->obj->flags |= (LOCAL | REMOTE);
 755                                 }
 756                         }
 757                 }
 758
 759                 /* Try fetching packed if necessary */
 760                 if (request->obj->flags & LOCAL)
 761                         release_request(request);
 762                 else
 763                         start_fetch_packed(request);
 764
 765         } else if (request->state == RUN_FETCH_PACKED) {
 766                 if (request->curl_result != CURLE_OK) {
 767                         fprintf(stderr, "Unable to get pack file %s\n%s",
 768                                 request->url, curl_errorstr);
 769                         remote->can_update_info_refs = 0;
 770                 } else {
 771                         fclose(request->local_stream);
 772                         request->local_stream = NULL;
 773                         if (!move_temp_to_file(request->tmpfile,
 774                                                request->filename)) {
 775                                 target = (struct packed_git *)request->userData;
 776                                 lst = &remote->packs;
 777                                 while (*lst != target)
 778                                         lst = &((*lst)->next);
 779                                 *lst = (*lst)->next;
 780
 781                                 if (!verify_pack(target, 0))
 782                                         install_packed_git(target);
 783                                 else
 784                                         remote->can_update_info_refs = 0;
 785                         }
 786                 }
 787                 release_request(request);
 788         }
 789 }
 790
 791 #ifdef USE_CURL_MULTI
 792 void fill_active_slots(void)
 793 {
 794         struct transfer_request *request = request_queue_head;
 795         struct transfer_request *next;
 796         struct active_request_slot *slot = active_queue_head;
 797         int num_transfers;
 798
 799         if (aborted)
 800                 return;
 801
 802         while (active_requests < max_requests && request != NULL) {
 803                 next = request->next;
 804                 if (request->state == NEED_FETCH) {
 805                         start_fetch_loose(request);
 806                 } else if (pushing && request->state == NEED_PUSH) {
 807                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 808                                 start_put(request);
 809                         } else {
 810                                 start_mkcol(request);
 811                         }
 812                         curl_multi_perform(curlm, &num_transfers);
 813                 }
 814                 request = next;
 815         }
 816
 817         while (slot != NULL) {
 818                 if (!slot->in_use && slot->curl != NULL) {
 819                         curl_easy_cleanup(slot->curl);
 820                         slot->curl = NULL;
 821                 }
 822                 slot = slot->next;
 823         }
 824 }
 825 #endif
 826
 827 static void get_remote_object_list(unsigned char parent);
 828
 829 static void add_fetch_request(struct object *obj)
 830 {
 831         struct transfer_request *request;
 832
 833         check_locks();
 834
 835         /*
 836          * Don't fetch the object if it's known to exist locally
 837          * or is already in the request queue
 838          */
 839         if (remote_dir_exists[obj->sha1[0]] == -1)
 840                 get_remote_object_list(obj->sha1[0]);
 841         if (obj->flags & (LOCAL | FETCHING))
 842                 return;
 843
 844         obj->flags |= FETCHING;
 845         request = xmalloc(sizeof(*request));
 846         request->obj = obj;
 847         request->url = NULL;
 848         request->lock = NULL;
 849         request->headers = NULL;
 850         request->local_fileno = -1;
 851         request->local_stream = NULL;
 852         request->state = NEED_FETCH;
 853         request->next = request_queue_head;
 854         request_queue_head = request;
 855
 856 #ifdef USE_CURL_MULTI
 857         fill_active_slots();
 858         step_active_slots();
 859 #endif
 860 }
 861
 862 static int add_send_request(struct object *obj, struct remote_lock *lock)
 863 {
 864         struct transfer_request *request = request_queue_head;
 865         struct packed_git *target;
 866
 867         /* Keep locks active */
 868         check_locks();
 869
 870         /*
 871          * Don't push the object if it's known to exist on the remote
 872          * or is already in the request queue
 873          */
 874         if (remote_dir_exists[obj->sha1[0]] == -1)
 875                 get_remote_object_list(obj->sha1[0]);
 876         if (obj->flags & (REMOTE | PUSHING))
 877                 return 0;
 878         target = find_sha1_pack(obj->sha1, remote->packs);
 879         if (target) {
 880                 obj->flags |= REMOTE;
 881                 return 0;
 882         }
 883
 884         obj->flags |= PUSHING;
 885         request = xmalloc(sizeof(*request));
 886         request->obj = obj;
 887         request->url = NULL;
 888         request->lock = lock;
 889         request->headers = NULL;
 890         request->local_fileno = -1;
 891         request->local_stream = NULL;
 892         request->state = NEED_PUSH;
 893         request->next = request_queue_head;
 894         request_queue_head = request;
 895
 896 #ifdef USE_CURL_MULTI
 897         fill_active_slots();
 898         step_active_slots();
 899 #endif
 900
 901         return 1;
 902 }
 903
 904 static int fetch_index(unsigned char *sha1)
 905 {
 906         char *hex = sha1_to_hex(sha1);
 907         char *filename;
 908         char *url;
 909         char tmpfile[PATH_MAX];
 910         long prev_posn = 0;
 911         char range[RANGE_HEADER_SIZE];
 912         struct curl_slist *range_header = NULL;
 913
 914         FILE *indexfile;
 915         struct active_request_slot *slot;
 916         struct slot_results results;
 917
 918         /* Don't use the index if the pack isn't there */
 919         url = xmalloc(strlen(remote->url) + 64);
 920         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 921         slot = get_active_slot();
 922         slot->results = &results;
 923         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 924         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 925         if (start_active_slot(slot)) {
 926                 run_active_slot(slot);
 927                 if (results.curl_result != CURLE_OK) {
 928                         free(url);
 929                         return error("Unable to verify pack %s is available",
 930                                      hex);
 931                 }
 932         } else {
 933                 return error("Unable to start request");
 934         }
 935
 936         if (has_pack_index(sha1))
 937                 return 0;
 938
 939         if (push_verbosely)
 940                 fprintf(stderr, "Getting index for pack %s\n", hex);
 941
 942         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 943
 944         filename = sha1_pack_index_name(sha1);
 945         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 946         indexfile = fopen(tmpfile, "a");
 947         if (!indexfile)
 948                 return error("Unable to open local file %s for pack index",
 949                              filename);
 950
 951         slot = get_active_slot();
 952         slot->results = &results;
 953         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 954         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 955         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 956         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 957         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 958         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 959         slot->local = indexfile;
 960
 961         /* If there is data present from a previous transfer attempt,
 962            resume where it left off */
 963         prev_posn = ftell(indexfile);
 964         if (prev_posn>0) {
 965                 if (push_verbosely)
 966                         fprintf(stderr,
 967                                 "Resuming fetch of index for pack %s at byte %ld\n",
 968                                 hex, prev_posn);
 969                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 970                 range_header = curl_slist_append(range_header, range);
 971                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 972         }
 973
 974         if (start_active_slot(slot)) {
 975                 run_active_slot(slot);
 976                 if (results.curl_result != CURLE_OK) {
 977                         free(url);
 978                         fclose(indexfile);
 979                         return error("Unable to get pack index %s\n%s", url,
 980                                      curl_errorstr);
 981                 }
 982         } else {
 983                 free(url);
 984                 fclose(indexfile);
 985                 return error("Unable to start request");
 986         }
 987
 988         free(url);
 989         fclose(indexfile);
 990
 991         return move_temp_to_file(tmpfile, filename);
 992 }
 993
 994 static int setup_index(unsigned char *sha1)
 995 {
 996         struct packed_git *new_pack;
 997
 998         if (fetch_index(sha1))
 999                 return -1;
1000
1001         new_pack = parse_pack_index(sha1);
1002         new_pack->next = remote->packs;
1003         remote->packs = new_pack;
1004         return 0;
1005 }
1006
1007 static int fetch_indices(void)
1008 {
1009         unsigned char sha1[20];
1010         char *url;
1011         struct buffer buffer;
1012         char *data;
1013         int i = 0;
1014
1015         struct active_request_slot *slot;
1016         struct slot_results results;
1017
1018         data = xcalloc(1, 4096);
1019         buffer.size = 4096;
1020         buffer.posn = 0;
1021         buffer.buffer = data;
1022
1023         if (push_verbosely)
1024                 fprintf(stderr, "Getting pack list\n");
1025
1026         url = xmalloc(strlen(remote->url) + 20);
1027         sprintf(url, "%sobjects/info/packs", remote->url);
1028
1029         slot = get_active_slot();
1030         slot->results = &results;
1031         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1032         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1033         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1034         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1035         if (start_active_slot(slot)) {
1036                 run_active_slot(slot);
1037                 if (results.curl_result != CURLE_OK) {
1038                         free(buffer.buffer);
1039                         free(url);
1040                         if (results.http_code == 404)
1041                                 return 0;
1042                         else
1043                                 return error("%s", curl_errorstr);
1044                 }
1045         } else {
1046                 free(buffer.buffer);
1047                 free(url);
1048                 return error("Unable to start request");
1049         }
1050         free(url);
1051
1052         data = buffer.buffer;
1053         while (i < buffer.posn) {
1054                 switch (data[i]) {
1055                 case 'P':
1056                         i++;
1057                         if (i + 52 < buffer.posn &&
1058                             !strncmp(data + i, " pack-", 6) &&
1059                             !strncmp(data + i + 46, ".pack\n", 6)) {
1060                                 get_sha1_hex(data + i + 6, sha1);
1061                                 setup_index(sha1);
1062                                 i += 51;
1063                                 break;
1064                         }
1065                 default:
1066                         while (data[i] != '\n')
1067                                 i++;
1068                 }
1069                 i++;
1070         }
1071
1072         free(buffer.buffer);
1073         return 0;
1074 }
1075
1076 static inline int needs_quote(int ch)
1077 {
1078         switch (ch) {
1079         case '/': case '-': case '.':
1080         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1081                 return 0;
1082         default:
1083                 return 1;
1084         }
1085 }
1086
1087 static inline int hex(int v)
1088 {
1089         if (v < 10) return '0' + v;
1090         else return 'A' + v - 10;
1091 }
1092
1093 static char *quote_ref_url(const char *base, const char *ref)
1094 {
1095         const char *cp;
1096         char *dp, *qref;
1097         int len, baselen, ch;
1098
1099         baselen = strlen(base);
1100         len = baselen + 1;
1101         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1102                 if (needs_quote(ch))
1103                         len += 2; /* extra two hex plus replacement % */
1104         qref = xmalloc(len);
1105         memcpy(qref, base, baselen);
1106         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1107                 if (needs_quote(ch)) {
1108                         *dp++ = '%';
1109                         *dp++ = hex((ch >> 4) & 0xF);
1110                         *dp++ = hex(ch & 0xF);
1111                 }
1112                 else
1113                         *dp++ = ch;
1114         }
1115         *dp = 0;
1116
1117         return qref;
1118 }
1119
1120 int fetch_ref(char *ref, unsigned char *sha1)
1121 {
1122         char *url;
1123         char hex[42];
1124         struct buffer buffer;
1125         char *base = remote->url;
1126         struct active_request_slot *slot;
1127         struct slot_results results;
1128         buffer.size = 41;
1129         buffer.posn = 0;
1130         buffer.buffer = hex;
1131         hex[41] = '\0';
1132
1133         url = quote_ref_url(base, ref);
1134         slot = get_active_slot();
1135         slot->results = &results;
1136         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1137         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1138         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1139         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1140         if (start_active_slot(slot)) {
1141                 run_active_slot(slot);
1142                 if (results.curl_result != CURLE_OK)
1143                         return error("Couldn't get %s for %s\n%s",
1144                                      url, ref, curl_errorstr);
1145         } else {
1146                 return error("Unable to start request");
1147         }
1148
1149         hex[40] = '\0';
1150         get_sha1_hex(hex, sha1);
1151         return 0;
1152 }
1153
1154 static void one_remote_object(const char *hex)
1155 {
1156         unsigned char sha1[20];
1157         struct object *obj;
1158
1159         if (get_sha1_hex(hex, sha1) != 0)
1160                 return;
1161
1162         obj = lookup_object(sha1);
1163         if (!obj)
1164                 obj = parse_object(sha1);
1165
1166         /* Ignore remote objects that don't exist locally */
1167         if (!obj)
1168                 return;
1169
1170         obj->flags |= REMOTE;
1171         if (!object_list_contains(objects, obj))
1172                 add_object(obj, &objects, NULL, "");
1173 }
1174
1175 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1176 {
1177         int *lock_flags = (int *)ctx->userData;
1178
1179         if (tag_closed) {
1180                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1181                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1182                             (*lock_flags & DAV_PROP_LOCKWR)) {
1183                                 *lock_flags |= DAV_LOCK_OK;
1184                         }
1185                         *lock_flags &= DAV_LOCK_OK;
1186                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1187                         *lock_flags |= DAV_PROP_LOCKWR;
1188                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1189                         *lock_flags |= DAV_PROP_LOCKEX;
1190                 }
1191         }
1192 }
1193
1194 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1195 {
1196         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1197
1198         if (tag_closed && ctx->cdata) {
1199                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1200                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1201                         strcpy(lock->owner, ctx->cdata);
1202                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1203                         if (!strncmp(ctx->cdata, "Second-", 7))
1204                                 lock->timeout =
1205                                         strtol(ctx->cdata + 7, NULL, 10);
1206                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1207                         if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
1208                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1209                                 strcpy(lock->token, ctx->cdata + 16);
1210                         }
1211                 }
1212         }
1213 }
1214
1215 static void one_remote_ref(char *refname);
1216
1217 static void
1218 xml_start_tag(void *userData, const char *name, const char **atts)
1219 {
1220         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1221         const char *c = strchr(name, ':');
1222         int new_len;
1223
1224         if (c == NULL)
1225                 c = name;
1226         else
1227                 c++;
1228
1229         new_len = strlen(ctx->name) + strlen(c) + 2;
1230
1231         if (new_len > ctx->len) {
1232                 ctx->name = xrealloc(ctx->name, new_len);
1233                 ctx->len = new_len;
1234         }
1235         strcat(ctx->name, ".");
1236         strcat(ctx->name, c);
1237
1238         if (ctx->cdata) {
1239                 free(ctx->cdata);
1240                 ctx->cdata = NULL;
1241         }
1242
1243         ctx->userFunc(ctx, 0);
1244 }
1245
1246 static void
1247 xml_end_tag(void *userData, const char *name)
1248 {
1249         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1250         const char *c = strchr(name, ':');
1251         char *ep;
1252
1253         ctx->userFunc(ctx, 1);
1254
1255         if (c == NULL)
1256                 c = name;
1257         else
1258                 c++;
1259
1260         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1261         *ep = 0;
1262 }
1263
1264 static void
1265 xml_cdata(void *userData, const XML_Char *s, int len)
1266 {
1267         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1268         if (ctx->cdata)
1269                 free(ctx->cdata);
1270         ctx->cdata = xcalloc(len+1, 1);
1271         strncpy(ctx->cdata, s, len);
1272 }
1273
1274 static struct remote_lock *lock_remote(char *path, long timeout)
1275 {
1276         struct active_request_slot *slot;
1277         struct slot_results results;
1278         struct buffer out_buffer;
1279         struct buffer in_buffer;
1280         char *out_data;
1281         char *in_data;
1282         char *url;
1283         char *ep;
1284         char timeout_header[25];
1285         struct remote_lock *lock = NULL;
1286         XML_Parser parser = XML_ParserCreate(NULL);
1287         enum XML_Status result;
1288         struct curl_slist *dav_headers = NULL;
1289         struct xml_ctx ctx;
1290
1291         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1292         sprintf(url, "%s%s", remote->url, path);
1293
1294         /* Make sure leading directories exist for the remote ref */
1295         ep = strchr(url + strlen(remote->url) + 11, '/');
1296         while (ep) {
1297                 *ep = 0;
1298                 slot = get_active_slot();
1299                 slot->results = &results;
1300                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1301                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1302                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1303                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1304                 if (start_active_slot(slot)) {
1305                         run_active_slot(slot);
1306                         if (results.curl_result != CURLE_OK &&
1307                             results.http_code != 405) {
1308                                 fprintf(stderr,
1309                                         "Unable to create branch path %s\n",
1310                                         url);
1311                                 free(url);
1312                                 return NULL;
1313                         }
1314                 } else {
1315                         fprintf(stderr, "Unable to start MKCOL request\n");
1316                         free(url);
1317                         return NULL;
1318                 }
1319                 *ep = '/';
1320                 ep = strchr(ep + 1, '/');
1321         }
1322
1323         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1324         out_data = xmalloc(out_buffer.size + 1);
1325         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1326         out_buffer.posn = 0;
1327         out_buffer.buffer = out_data;
1328
1329         in_buffer.size = 4096;
1330         in_data = xmalloc(in_buffer.size);
1331         in_buffer.posn = 0;
1332         in_buffer.buffer = in_data;
1333
1334         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1335         dav_headers = curl_slist_append(dav_headers, timeout_header);
1336         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1337
1338         slot = get_active_slot();
1339         slot->results = &results;
1340         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1341         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1342         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1343         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1344         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1345         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1346         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1347         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1348         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1349
1350         lock = xcalloc(1, sizeof(*lock));
1351         lock->timeout = -1;
1352
1353         if (start_active_slot(slot)) {
1354                 run_active_slot(slot);
1355                 if (results.curl_result == CURLE_OK) {
1356                         ctx.name = xcalloc(10, 1);
1357                         ctx.len = 0;
1358                         ctx.cdata = NULL;
1359                         ctx.userFunc = handle_new_lock_ctx;
1360                         ctx.userData = lock;
1361                         XML_SetUserData(parser, &ctx);
1362                         XML_SetElementHandler(parser, xml_start_tag,
1363                                               xml_end_tag);
1364                         XML_SetCharacterDataHandler(parser, xml_cdata);
1365                         result = XML_Parse(parser, in_buffer.buffer,
1366                                            in_buffer.posn, 1);
1367                         free(ctx.name);
1368                         if (result != XML_STATUS_OK) {
1369                                 fprintf(stderr, "XML error: %s\n",
1370                                         XML_ErrorString(
1371                                                 XML_GetErrorCode(parser)));
1372                                 lock->timeout = -1;
1373                         }
1374                 }
1375         } else {
1376                 fprintf(stderr, "Unable to start LOCK request\n");
1377         }
1378
1379         curl_slist_free_all(dav_headers);
1380         free(out_data);
1381         free(in_data);
1382
1383         if (lock->token == NULL || lock->timeout <= 0) {
1384                 if (lock->token != NULL)
1385                         free(lock->token);
1386                 if (lock->owner != NULL)
1387                         free(lock->owner);
1388                 free(url);
1389                 free(lock);
1390                 lock = NULL;
1391         } else {
1392                 lock->url = url;
1393                 lock->start_time = time(NULL);
1394                 lock->next = remote->locks;
1395                 remote->locks = lock;
1396         }
1397
1398         return lock;
1399 }
1400
1401 static int unlock_remote(struct remote_lock *lock)
1402 {
1403         struct active_request_slot *slot;
1404         struct slot_results results;
1405         struct remote_lock *prev = remote->locks;
1406         char *lock_token_header;
1407         struct curl_slist *dav_headers = NULL;
1408         int rc = 0;
1409
1410         lock_token_header = xmalloc(strlen(lock->token) + 31);
1411         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1412                 lock->token);
1413         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1414
1415         slot = get_active_slot();
1416         slot->results = &results;
1417         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1418         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1419         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1420         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1421
1422         if (start_active_slot(slot)) {
1423                 run_active_slot(slot);
1424                 if (results.curl_result == CURLE_OK)
1425                         rc = 1;
1426                 else
1427                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1428                                 results.http_code);
1429         } else {
1430                 fprintf(stderr, "Unable to start UNLOCK request\n");
1431         }
1432
1433         curl_slist_free_all(dav_headers);
1434         free(lock_token_header);
1435
1436         if (remote->locks == lock) {
1437                 remote->locks = lock->next;
1438         } else {
1439                 while (prev && prev->next != lock)
1440                         prev = prev->next;
1441                 if (prev)
1442                         prev->next = prev->next->next;
1443         }
1444
1445         if (lock->owner != NULL)
1446                 free(lock->owner);
1447         free(lock->url);
1448         free(lock->token);
1449         free(lock);
1450
1451         return rc;
1452 }
1453
1454 static void remote_ls(const char *path, int flags,
1455                       void (*userFunc)(struct remote_ls_ctx *ls),
1456                       void *userData);
1457
1458 static void process_ls_object(struct remote_ls_ctx *ls)
1459 {
1460         unsigned int *parent = (unsigned int *)ls->userData;
1461         char *path = ls->dentry_name;
1462         char *obj_hex;
1463
1464         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1465                 remote_dir_exists[*parent] = 1;
1466                 return;
1467         }
1468
1469         if (strlen(path) != 49)
1470                 return;
1471         path += 8;
1472         obj_hex = xmalloc(strlen(path));
1473         strncpy(obj_hex, path, 2);
1474         strcpy(obj_hex + 2, path + 3);
1475         one_remote_object(obj_hex);
1476         free(obj_hex);
1477 }
1478
1479 static void process_ls_ref(struct remote_ls_ctx *ls)
1480 {
1481         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1482                 fprintf(stderr, "  %s\n", ls->dentry_name);
1483                 return;
1484         }
1485
1486         if (!(ls->dentry_flags & IS_DIR))
1487                 one_remote_ref(ls->dentry_name);
1488 }
1489
1490 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1491 {
1492         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1493
1494         if (tag_closed) {
1495                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1496                         if (ls->dentry_flags & IS_DIR) {
1497                                 if (ls->flags & PROCESS_DIRS) {
1498                                         ls->userFunc(ls);
1499                                 }
1500                                 if (strcmp(ls->dentry_name, ls->path) &&
1501                                     ls->flags & RECURSIVE) {
1502                                         remote_ls(ls->dentry_name,
1503                                                   ls->flags,
1504                                                   ls->userFunc,
1505                                                   ls->userData);
1506                                 }
1507                         } else if (ls->flags & PROCESS_FILES) {
1508                                 ls->userFunc(ls);
1509                         }
1510                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1511                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1512                                                   remote->path_len + 1);
1513                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1514                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1515                         ls->dentry_flags |= IS_DIR;
1516                 }
1517         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1518                 if (ls->dentry_name) {
1519                         free(ls->dentry_name);
1520                 }
1521                 ls->dentry_name = NULL;
1522                 ls->dentry_flags = 0;
1523         }
1524 }
1525
1526 static void remote_ls(const char *path, int flags,
1527                       void (*userFunc)(struct remote_ls_ctx *ls),
1528                       void *userData)
1529 {
1530         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1531         struct active_request_slot *slot;
1532         struct slot_results results;
1533         struct buffer in_buffer;
1534         struct buffer out_buffer;
1535         char *in_data;
1536         char *out_data;
1537         XML_Parser parser = XML_ParserCreate(NULL);
1538         enum XML_Status result;
1539         struct curl_slist *dav_headers = NULL;
1540         struct xml_ctx ctx;
1541         struct remote_ls_ctx ls;
1542
1543         ls.flags = flags;
1544         ls.path = strdup(path);
1545         ls.dentry_name = NULL;
1546         ls.dentry_flags = 0;
1547         ls.userData = userData;
1548         ls.userFunc = userFunc;
1549
1550         sprintf(url, "%s%s", remote->url, path);
1551
1552         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1553         out_data = xmalloc(out_buffer.size + 1);
1554         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1555         out_buffer.posn = 0;
1556         out_buffer.buffer = out_data;
1557
1558         in_buffer.size = 4096;
1559         in_data = xmalloc(in_buffer.size);
1560         in_buffer.posn = 0;
1561         in_buffer.buffer = in_data;
1562
1563         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1564         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1565
1566         slot = get_active_slot();
1567         slot->results = &results;
1568         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1569         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1570         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1571         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1572         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1573         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1574         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1575         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1576         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1577
1578         if (start_active_slot(slot)) {
1579                 run_active_slot(slot);
1580                 if (results.curl_result == CURLE_OK) {
1581                         ctx.name = xcalloc(10, 1);
1582                         ctx.len = 0;
1583                         ctx.cdata = NULL;
1584                         ctx.userFunc = handle_remote_ls_ctx;
1585                         ctx.userData = &ls;
1586                         XML_SetUserData(parser, &ctx);
1587                         XML_SetElementHandler(parser, xml_start_tag,
1588                                               xml_end_tag);
1589                         XML_SetCharacterDataHandler(parser, xml_cdata);
1590                         result = XML_Parse(parser, in_buffer.buffer,
1591                                            in_buffer.posn, 1);
1592                         free(ctx.name);
1593
1594                         if (result != XML_STATUS_OK) {
1595                                 fprintf(stderr, "XML error: %s\n",
1596                                         XML_ErrorString(
1597                                                 XML_GetErrorCode(parser)));
1598                         }
1599                 }
1600         } else {
1601                 fprintf(stderr, "Unable to start PROPFIND request\n");
1602         }
1603
1604         free(ls.path);
1605         free(url);
1606         free(out_data);
1607         free(in_buffer.buffer);
1608         curl_slist_free_all(dav_headers);
1609 }
1610
1611 static void get_remote_object_list(unsigned char parent)
1612 {
1613         char path[] = "objects/XX/";
1614         static const char hex[] = "0123456789abcdef";
1615         unsigned int val = parent;
1616
1617         path[8] = hex[val >> 4];
1618         path[9] = hex[val & 0xf];
1619         remote_dir_exists[val] = 0;
1620         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1621                   process_ls_object, &val);
1622 }
1623
1624 static int locking_available(void)
1625 {
1626         struct active_request_slot *slot;
1627         struct slot_results results;
1628         struct buffer in_buffer;
1629         struct buffer out_buffer;
1630         char *in_data;
1631         char *out_data;
1632         XML_Parser parser = XML_ParserCreate(NULL);
1633         enum XML_Status result;
1634         struct curl_slist *dav_headers = NULL;
1635         struct xml_ctx ctx;
1636         int lock_flags = 0;
1637
1638         out_buffer.size =
1639                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1640                 strlen(remote->url) - 2;
1641         out_data = xmalloc(out_buffer.size + 1);
1642         snprintf(out_data, out_buffer.size + 1,
1643                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1644         out_buffer.posn = 0;
1645         out_buffer.buffer = out_data;
1646
1647         in_buffer.size = 4096;
1648         in_data = xmalloc(in_buffer.size);
1649         in_buffer.posn = 0;
1650         in_buffer.buffer = in_data;
1651
1652         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1653         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1654
1655         slot = get_active_slot();
1656         slot->results = &results;
1657         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1658         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1659         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1660         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1661         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1662         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1663         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1664         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1665         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1666
1667         if (start_active_slot(slot)) {
1668                 run_active_slot(slot);
1669                 if (results.curl_result == CURLE_OK) {
1670                         ctx.name = xcalloc(10, 1);
1671                         ctx.len = 0;
1672                         ctx.cdata = NULL;
1673                         ctx.userFunc = handle_lockprop_ctx;
1674                         ctx.userData = &lock_flags;
1675                         XML_SetUserData(parser, &ctx);
1676                         XML_SetElementHandler(parser, xml_start_tag,
1677                                               xml_end_tag);
1678                         result = XML_Parse(parser, in_buffer.buffer,
1679                                            in_buffer.posn, 1);
1680                         free(ctx.name);
1681
1682                         if (result != XML_STATUS_OK) {
1683                                 fprintf(stderr, "XML error: %s\n",
1684                                         XML_ErrorString(
1685                                                 XML_GetErrorCode(parser)));
1686                                 lock_flags = 0;
1687                         }
1688                 }
1689         } else {
1690                 fprintf(stderr, "Unable to start PROPFIND request\n");
1691         }
1692
1693         free(out_data);
1694         free(in_buffer.buffer);
1695         curl_slist_free_all(dav_headers);
1696
1697         return lock_flags;
1698 }
1699
1700 static struct object_list **process_blob(struct blob *blob,
1701                                          struct object_list **p,
1702                                          struct name_path *path,
1703                                          const char *name)
1704 {
1705         struct object *obj = &blob->object;
1706
1707         obj->flags |= LOCAL;
1708
1709         if (obj->flags & (UNINTERESTING | SEEN))
1710                 return p;
1711
1712         obj->flags |= SEEN;
1713         name = strdup(name);
1714         return add_object(obj, p, path, name);
1715 }
1716
1717 static struct object_list **process_tree(struct tree *tree,
1718                                          struct object_list **p,
1719                                          struct name_path *path,
1720                                          const char *name)
1721 {
1722         struct object *obj = &tree->object;
1723         struct tree_desc desc;
1724         struct name_entry entry;
1725         struct name_path me;
1726
1727         obj->flags |= LOCAL;
1728
1729         if (obj->flags & (UNINTERESTING | SEEN))
1730                 return p;
1731         if (parse_tree(tree) < 0)
1732                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1733
1734         obj->flags |= SEEN;
1735         name = strdup(name);
1736         p = add_object(obj, p, NULL, name);
1737         me.up = path;
1738         me.elem = name;
1739         me.elem_len = strlen(name);
1740
1741         desc.buf = tree->buffer;
1742         desc.size = tree->size;
1743
1744         while (tree_entry(&desc, &entry)) {
1745                 if (S_ISDIR(entry.mode))
1746                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1747                 else
1748                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1749         }
1750         free(tree->buffer);
1751         tree->buffer = NULL;
1752         return p;
1753 }
1754
1755 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1756 {
1757         struct commit *commit;
1758         struct object_list **p = &objects, *pending;
1759         int count = 0;
1760
1761         while ((commit = get_revision(revs)) != NULL) {
1762                 p = process_tree(commit->tree, p, NULL, "");
1763                 commit->object.flags |= LOCAL;
1764                 if (!(commit->object.flags & UNINTERESTING))
1765                         count += add_send_request(&commit->object, lock);
1766         }
1767
1768         for (pending = revs->pending_objects; pending; pending = pending->next) {
1769                 struct object *obj = pending->item;
1770                 const char *name = pending->name;
1771
1772                 if (obj->flags & (UNINTERESTING | SEEN))
1773                         continue;
1774                 if (obj->type == tag_type) {
1775                         obj->flags |= SEEN;
1776                         p = add_object(obj, p, NULL, name);
1777                         continue;
1778                 }
1779                 if (obj->type == tree_type) {
1780                         p = process_tree((struct tree *)obj, p, NULL, name);
1781                         continue;
1782                 }
1783                 if (obj->type == blob_type) {
1784                         p = process_blob((struct blob *)obj, p, NULL, name);
1785                         continue;
1786                 }
1787                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1788         }
1789
1790         while (objects) {
1791                 if (!(objects->item->flags & UNINTERESTING))
1792                         count += add_send_request(objects->item, lock);
1793                 objects = objects->next;
1794         }
1795
1796         return count;
1797 }
1798
1799 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1800 {
1801         struct active_request_slot *slot;
1802         struct slot_results results;
1803         char *out_data;
1804         char *if_header;
1805         struct buffer out_buffer;
1806         struct curl_slist *dav_headers = NULL;
1807         int i;
1808
1809         if_header = xmalloc(strlen(lock->token) + 25);
1810         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1811         dav_headers = curl_slist_append(dav_headers, if_header);
1812
1813         out_buffer.size = 41;
1814         out_data = xmalloc(out_buffer.size + 1);
1815         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1816         if (i != out_buffer.size) {
1817                 fprintf(stderr, "Unable to initialize PUT request body\n");
1818                 return 0;
1819         }
1820         out_buffer.posn = 0;
1821         out_buffer.buffer = out_data;
1822
1823         slot = get_active_slot();
1824         slot->results = &results;
1825         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1826         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1827         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1828         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1829         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1830         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1831         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1832         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1833         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1834
1835         if (start_active_slot(slot)) {
1836                 run_active_slot(slot);
1837                 free(out_data);
1838                 free(if_header);
1839                 if (results.curl_result != CURLE_OK) {
1840                         fprintf(stderr,
1841                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1842                                 results.curl_result, results.http_code);
1843                         /* We should attempt recovery? */
1844                         return 0;
1845                 }
1846         } else {
1847                 free(out_data);
1848                 free(if_header);
1849                 fprintf(stderr, "Unable to start PUT request\n");
1850                 return 0;
1851         }
1852
1853         return 1;
1854 }
1855
1856 static struct ref *local_refs, **local_tail;
1857 static struct ref *remote_refs, **remote_tail;
1858
1859 static int one_local_ref(const char *refname, const unsigned char *sha1)
1860 {
1861         struct ref *ref;
1862         int len = strlen(refname) + 1;
1863         ref = xcalloc(1, sizeof(*ref) + len);
1864         memcpy(ref->new_sha1, sha1, 20);
1865         memcpy(ref->name, refname, len);
1866         *local_tail = ref;
1867         local_tail = &ref->next;
1868         return 0;
1869 }
1870
1871 static void one_remote_ref(char *refname)
1872 {
1873         struct ref *ref;
1874         unsigned char remote_sha1[20];
1875         struct object *obj;
1876         int len = strlen(refname) + 1;
1877
1878         if (fetch_ref(refname, remote_sha1) != 0) {
1879                 fprintf(stderr,
1880                         "Unable to fetch ref %s from %s\n",
1881                         refname, remote->url);
1882                 return;
1883         }
1884
1885         /*
1886          * Fetch a copy of the object if it doesn't exist locally - it
1887          * may be required for updating server info later.
1888          */
1889         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1890                 obj = lookup_unknown_object(remote_sha1);
1891                 if (obj) {
1892                         fprintf(stderr, "  fetch %s for %s\n",
1893                                 sha1_to_hex(remote_sha1), refname);
1894                         add_fetch_request(obj);
1895                 }
1896         }
1897
1898         ref = xcalloc(1, sizeof(*ref) + len);
1899         memcpy(ref->old_sha1, remote_sha1, 20);
1900         memcpy(ref->name, refname, len);
1901         *remote_tail = ref;
1902         remote_tail = &ref->next;
1903 }
1904
1905 static void get_local_heads(void)
1906 {
1907         local_tail = &local_refs;
1908         for_each_ref(one_local_ref);
1909 }
1910
1911 static void get_dav_remote_heads(void)
1912 {
1913         remote_tail = &remote_refs;
1914         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1915 }
1916
1917 static int is_zero_sha1(const unsigned char *sha1)
1918 {
1919         int i;
1920
1921         for (i = 0; i < 20; i++) {
1922                 if (*sha1++)
1923                         return 0;
1924         }
1925         return 1;
1926 }
1927
1928 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1929 {
1930         while (list) {
1931                 struct commit_list *temp = list;
1932                 temp->item->object.flags &= ~mark;
1933                 list = temp->next;
1934                 free(temp);
1935         }
1936 }
1937
1938 static int ref_newer(const unsigned char *new_sha1,
1939                      const unsigned char *old_sha1)
1940 {
1941         struct object *o;
1942         struct commit *old, *new;
1943         struct commit_list *list, *used;
1944         int found = 0;
1945
1946         /* Both new and old must be commit-ish and new is descendant of
1947          * old.  Otherwise we require --force.
1948          */
1949         o = deref_tag(parse_object(old_sha1), NULL, 0);
1950         if (!o || o->type != commit_type)
1951                 return 0;
1952         old = (struct commit *) o;
1953
1954         o = deref_tag(parse_object(new_sha1), NULL, 0);
1955         if (!o || o->type != commit_type)
1956                 return 0;
1957         new = (struct commit *) o;
1958
1959         if (parse_commit(new) < 0)
1960                 return 0;
1961
1962         used = list = NULL;
1963         commit_list_insert(new, &list);
1964         while (list) {
1965                 new = pop_most_recent_commit(&list, TMP_MARK);
1966                 commit_list_insert(new, &used);
1967                 if (new == old) {
1968                         found = 1;
1969                         break;
1970                 }
1971         }
1972         unmark_and_free(list, TMP_MARK);
1973         unmark_and_free(used, TMP_MARK);
1974         return found;
1975 }
1976
1977 static void mark_edge_parents_uninteresting(struct commit *commit)
1978 {
1979         struct commit_list *parents;
1980
1981         for (parents = commit->parents; parents; parents = parents->next) {
1982                 struct commit *parent = parents->item;
1983                 if (!(parent->object.flags & UNINTERESTING))
1984                         continue;
1985                 mark_tree_uninteresting(parent->tree);
1986         }
1987 }
1988
1989 static void mark_edges_uninteresting(struct commit_list *list)
1990 {
1991         for ( ; list; list = list->next) {
1992                 struct commit *commit = list->item;
1993
1994                 if (commit->object.flags & UNINTERESTING) {
1995                         mark_tree_uninteresting(commit->tree);
1996                         continue;
1997                 }
1998                 mark_edge_parents_uninteresting(commit);
1999         }
2000 }
2001
2002 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2003 {
2004         struct buffer *buf = (struct buffer *)ls->userData;
2005         unsigned char remote_sha1[20];
2006         struct object *o;
2007         int len;
2008         char *ref_info;
2009
2010         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2011                 fprintf(stderr,
2012                         "Unable to fetch ref %s from %s\n",
2013                         ls->dentry_name, remote->url);
2014                 aborted = 1;
2015                 return;
2016         }
2017
2018         o = parse_object(remote_sha1);
2019         if (!o) {
2020                 fprintf(stderr,
2021                         "Unable to parse object %s for remote ref %s\n",
2022                         sha1_to_hex(remote_sha1), ls->dentry_name);
2023                 aborted = 1;
2024                 return;
2025         }
2026
2027         len = strlen(ls->dentry_name) + 42;
2028         ref_info = xcalloc(len + 1, 1);
2029         sprintf(ref_info, "%s   %s\n",
2030                 sha1_to_hex(remote_sha1), ls->dentry_name);
2031         fwrite_buffer(ref_info, 1, len, buf);
2032         free(ref_info);
2033
2034         if (o->type == tag_type) {
2035                 o = deref_tag(o, ls->dentry_name, 0);
2036                 if (o) {
2037                         len = strlen(ls->dentry_name) + 45;
2038                         ref_info = xcalloc(len + 1, 1);
2039                         sprintf(ref_info, "%s   %s^{}\n",
2040                                 sha1_to_hex(o->sha1), ls->dentry_name);
2041                         fwrite_buffer(ref_info, 1, len, buf);
2042                         free(ref_info);
2043                 }
2044         }
2045 }
2046
2047 static void update_remote_info_refs(struct remote_lock *lock)
2048 {
2049         struct buffer buffer;
2050         struct active_request_slot *slot;
2051         struct slot_results results;
2052         char *if_header;
2053         struct curl_slist *dav_headers = NULL;
2054
2055         buffer.buffer = xcalloc(1, 4096);
2056         buffer.size = 4096;
2057         buffer.posn = 0;
2058         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2059                   add_remote_info_ref, &buffer);
2060         if (!aborted) {
2061                 if_header = xmalloc(strlen(lock->token) + 25);
2062                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2063                 dav_headers = curl_slist_append(dav_headers, if_header);
2064
2065                 slot = get_active_slot();
2066                 slot->results = &results;
2067                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2068                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2069                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2070                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2071                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2072                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2073                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2074                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2075                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2076
2077                 buffer.posn = 0;
2078
2079                 if (start_active_slot(slot)) {
2080                         run_active_slot(slot);
2081                         if (results.curl_result != CURLE_OK) {
2082                                 fprintf(stderr,
2083                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2084                                         results.curl_result, results.http_code);
2085                         }
2086                 }
2087                 free(if_header);
2088         }
2089         free(buffer.buffer);
2090 }
2091
2092 static int remote_exists(const char *path)
2093 {
2094         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2095         struct active_request_slot *slot;
2096         struct slot_results results;
2097
2098         sprintf(url, "%s%s", remote->url, path);
2099
2100         slot = get_active_slot();
2101         slot->results = &results;
2102         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2103         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2104
2105         if (start_active_slot(slot)) {
2106                 run_active_slot(slot);
2107                 if (results.http_code == 404)
2108                         return 0;
2109                 else if (results.curl_result == CURLE_OK)
2110                         return 1;
2111                 else
2112                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2113         } else {
2114                 fprintf(stderr, "Unable to start HEAD request\n");
2115         }
2116
2117         return -1;
2118 }
2119
2120 static void fetch_symref(char *path, char **symref, unsigned char *sha1)
2121 {
2122         char *url;
2123         struct buffer buffer;
2124         struct active_request_slot *slot;
2125         struct slot_results results;
2126
2127         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2128         sprintf(url, "%s%s", remote->url, path);
2129
2130         buffer.size = 4096;
2131         buffer.posn = 0;
2132         buffer.buffer = xmalloc(buffer.size);
2133
2134         slot = get_active_slot();
2135         slot->results = &results;
2136         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2137         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2138         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2139         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2140         if (start_active_slot(slot)) {
2141                 run_active_slot(slot);
2142                 if (results.curl_result != CURLE_OK) {
2143                         die("Couldn't get %s for remote symref\n%s",
2144                             url, curl_errorstr);
2145                 }
2146         } else {
2147                 die("Unable to start remote symref request");
2148         }
2149         free(url);
2150
2151         if (*symref != NULL)
2152                 free(*symref);
2153         *symref = NULL;
2154         memset(sha1, 0, 20);
2155
2156         if (buffer.posn == 0)
2157                 return;
2158
2159         /* If it's a symref, set the refname; otherwise try for a sha1 */
2160         if (!strncmp((char *)buffer.buffer, "ref: ", 5)) {
2161                 *symref = xcalloc(buffer.posn - 5, 1);
2162                 strncpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6);
2163         } else {
2164                 get_sha1_hex(buffer.buffer, sha1);
2165         }
2166
2167         free(buffer.buffer);
2168 }
2169
2170 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2171 {
2172         int pipe_fd[2];
2173         pid_t merge_base_pid;
2174         char line[PATH_MAX + 20];
2175         unsigned char merge_sha1[20];
2176         int verified = 0;
2177
2178         if (pipe(pipe_fd) < 0)
2179                 die("Verify merge base: pipe failed");
2180
2181         merge_base_pid = fork();
2182         if (!merge_base_pid) {
2183                 static const char *args[] = {
2184                         "merge-base",
2185                         "-a",
2186                         NULL,
2187                         NULL,
2188                         NULL
2189                 };
2190                 args[2] = strdup(sha1_to_hex(head_sha1));
2191                 args[3] = sha1_to_hex(branch_sha1);
2192
2193                 dup2(pipe_fd[1], 1);
2194                 close(pipe_fd[0]);
2195                 close(pipe_fd[1]);
2196                 execv_git_cmd(args);
2197                 die("merge-base setup failed");
2198         }
2199         if (merge_base_pid < 0)
2200                 die("merge-base fork failed");
2201
2202         dup2(pipe_fd[0], 0);
2203         close(pipe_fd[0]);
2204         close(pipe_fd[1]);
2205         while (fgets(line, sizeof(line), stdin) != NULL) {
2206                 if (get_sha1_hex(line, merge_sha1))
2207                         die("expected sha1, got garbage:\n %s", line);
2208                 if (!memcmp(branch_sha1, merge_sha1, 20)) {
2209                         verified = 1;
2210                         break;
2211                 }
2212         }
2213
2214         return verified;
2215 }
2216
2217 static int delete_remote_branch(char *pattern, int force)
2218 {
2219         struct ref *refs = remote_refs;
2220         struct ref *remote_ref = NULL;
2221         unsigned char head_sha1[20];
2222         char *symref = NULL;
2223         int match;
2224         int patlen = strlen(pattern);
2225         int i;
2226         struct active_request_slot *slot;
2227         struct slot_results results;
2228         char *url;
2229
2230         /* Find the remote branch(es) matching the specified branch name */
2231         for (match = 0; refs; refs = refs->next) {
2232                 char *name = refs->name;
2233                 int namelen = strlen(name);
2234                 if (namelen < patlen ||
2235                     memcmp(name + namelen - patlen, pattern, patlen))
2236                         continue;
2237                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2238                         continue;
2239                 match++;
2240                 remote_ref = refs;
2241         }
2242         if (match == 0)
2243                 return error("No remote branch matches %s", pattern);
2244         if (match != 1)
2245                 return error("More than one remote branch matches %s",
2246                              pattern);
2247
2248         /*
2249          * Remote HEAD must be a symref (not exactly foolproof; a remote
2250          * symlink to a symref will look like a symref)
2251          */
2252         fetch_symref("HEAD", &symref, head_sha1);
2253         if (!symref)
2254                 return error("Remote HEAD is not a symref");
2255
2256         /* Remote branch must not be the remote HEAD */
2257         for (i=0; symref && i<MAXDEPTH; i++) {
2258                 if (!strcmp(remote_ref->name, symref))
2259                         return error("Remote branch %s is the current HEAD",
2260                                      remote_ref->name);
2261                 fetch_symref(symref, &symref, head_sha1);
2262         }
2263
2264         /* Run extra sanity checks if delete is not forced */
2265         if (!force) {
2266                 /* Remote HEAD must resolve to a known object */
2267                 if (symref)
2268                         return error("Remote HEAD symrefs too deep");
2269                 if (is_zero_sha1(head_sha1))
2270                         return error("Unable to resolve remote HEAD");
2271                 if (!has_sha1_file(head_sha1))
2272                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2273
2274                 /* Remote branch must resolve to a known object */
2275                 if (is_zero_sha1(remote_ref->old_sha1))
2276                         return error("Unable to resolve remote branch %s",
2277                                      remote_ref->name);
2278                 if (!has_sha1_file(remote_ref->old_sha1))
2279                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2280
2281                 /* Remote branch must be an ancestor of remote HEAD */
2282                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2283                         return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern);
2284                 }
2285         }
2286
2287         /* Send delete request */
2288         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2289         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2290         sprintf(url, "%s%s", remote->url, remote_ref->name);
2291         slot = get_active_slot();
2292         slot->results = &results;
2293         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2294         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2295         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2296         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2297         if (start_active_slot(slot)) {
2298                 run_active_slot(slot);
2299                 free(url);
2300                 if (results.curl_result != CURLE_OK)
2301                         return error("DELETE request failed (%d/%ld)\n",
2302                                      results.curl_result, results.http_code);
2303         } else {
2304                 free(url);
2305                 return error("Unable to start DELETE request");
2306         }
2307
2308         return 0;
2309 }
2310
2311 int main(int argc, char **argv)
2312 {
2313         struct transfer_request *request;
2314         struct transfer_request *next_request;
2315         int nr_refspec = 0;
2316         char **refspec = NULL;
2317         struct remote_lock *ref_lock = NULL;
2318         struct remote_lock *info_ref_lock = NULL;
2319         struct rev_info revs;
2320         int delete_branch = 0;
2321         int force_delete = 0;
2322         int objects_to_send;
2323         int rc = 0;
2324         int i;
2325         int new_refs;
2326         struct ref *ref;
2327
2328         setup_git_directory();
2329         setup_ident();
2330
2331         remote = xcalloc(sizeof(*remote), 1);
2332
2333         argv++;
2334         for (i = 1; i < argc; i++, argv++) {
2335                 char *arg = *argv;
2336
2337                 if (*arg == '-') {
2338                         if (!strcmp(arg, "--all")) {
2339                                 push_all = 1;
2340                                 continue;
2341                         }
2342                         if (!strcmp(arg, "--force")) {
2343                                 force_all = 1;
2344                                 continue;
2345                         }
2346                         if (!strcmp(arg, "--verbose")) {
2347                                 push_verbosely = 1;
2348                                 continue;
2349                         }
2350                         if (!strcmp(arg, "-d")) {
2351                                 delete_branch = 1;
2352                                 continue;
2353                         }
2354                         if (!strcmp(arg, "-D")) {
2355                                 delete_branch = 1;
2356                                 force_delete = 1;
2357                                 continue;
2358                         }
2359                 }
2360                 if (!remote->url) {
2361                         char *path = strstr(arg, "//");
2362                         remote->url = arg;
2363                         if (path) {
2364                                 path = strchr(path+2, '/');
2365                                 if (path)
2366                                         remote->path_len = strlen(path);
2367                         }
2368                         continue;
2369                 }
2370                 refspec = argv;
2371                 nr_refspec = argc - i;
2372                 break;
2373         }
2374
2375         if (!remote->url)
2376                 usage(http_push_usage);
2377
2378         if (delete_branch && nr_refspec != 1)
2379                 die("You must specify only one branch name when deleting a remote branch");
2380
2381         memset(remote_dir_exists, -1, 256);
2382
2383         http_init();
2384
2385         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2386         default_headers = curl_slist_append(default_headers, "Range:");
2387         default_headers = curl_slist_append(default_headers, "Destination:");
2388         default_headers = curl_slist_append(default_headers, "If:");
2389         default_headers = curl_slist_append(default_headers,
2390                                             "Pragma: no-cache");
2391
2392         /* Verify DAV compliance/lock support */
2393         if (!locking_available()) {
2394                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2395                 rc = 1;
2396                 goto cleanup;
2397         }
2398
2399         /* Check whether the remote has server info files */
2400         remote->can_update_info_refs = 0;
2401         remote->has_info_refs = remote_exists("info/refs");
2402         remote->has_info_packs = remote_exists("objects/info/packs");
2403         if (remote->has_info_refs) {
2404                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2405                 if (info_ref_lock)
2406                         remote->can_update_info_refs = 1;
2407         }
2408         if (remote->has_info_packs)
2409                 fetch_indices();
2410
2411         /* Get a list of all local and remote heads to validate refspecs */
2412         get_local_heads();
2413         fprintf(stderr, "Fetching remote heads...\n");
2414         get_dav_remote_heads();
2415
2416         /* Remove a remote branch if -d or -D was specified */
2417         if (delete_branch) {
2418                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2419                         fprintf(stderr, "Unable to delete remote branch %s\n",
2420                                 refspec[0]);
2421                 goto cleanup;
2422         }
2423
2424         /* match them up */
2425         if (!remote_tail)
2426                 remote_tail = &remote_refs;
2427         if (match_refs(local_refs, remote_refs, &remote_tail,
2428                        nr_refspec, refspec, push_all))
2429                 return -1;
2430         if (!remote_refs) {
2431                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2432                 return 0;
2433         }
2434
2435         new_refs = 0;
2436         for (ref = remote_refs; ref; ref = ref->next) {
2437                 char old_hex[60], *new_hex;
2438                 const char *commit_argv[4];
2439                 int commit_argc;
2440                 char *new_sha1_hex, *old_sha1_hex;
2441
2442                 if (!ref->peer_ref)
2443                         continue;
2444                 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
2445                         if (push_verbosely || 1)
2446                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2447                         continue;
2448                 }
2449
2450                 if (!force_all &&
2451                     !is_zero_sha1(ref->old_sha1) &&
2452                     !ref->force) {
2453                         if (!has_sha1_file(ref->old_sha1) ||
2454                             !ref_newer(ref->peer_ref->new_sha1,
2455                                        ref->old_sha1)) {
2456                                 /* We do not have the remote ref, or
2457                                  * we know that the remote ref is not
2458                                  * an ancestor of what we are trying to
2459                                  * push.  Either way this can be losing
2460                                  * commits at the remote end and likely
2461                                  * we were not up to date to begin with.
2462                                  */
2463                                 error("remote '%s' is not a strict "
2464                                       "subset of local ref '%s'. "
2465                                       "maybe you are not up-to-date and "
2466                                       "need to pull first?",
2467                                       ref->name,
2468                                       ref->peer_ref->name);
2469                                 rc = -2;
2470                                 continue;
2471                         }
2472                 }
2473                 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
2474                 if (is_zero_sha1(ref->new_sha1)) {
2475                         error("cannot happen anymore");
2476                         rc = -3;
2477                         continue;
2478                 }
2479                 new_refs++;
2480                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2481                 new_hex = sha1_to_hex(ref->new_sha1);
2482
2483                 fprintf(stderr, "updating '%s'", ref->name);
2484                 if (strcmp(ref->name, ref->peer_ref->name))
2485                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2486                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2487
2488
2489                 /* Lock remote branch ref */
2490                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2491                 if (ref_lock == NULL) {
2492                         fprintf(stderr, "Unable to lock remote branch %s\n",
2493                                 ref->name);
2494                         rc = 1;
2495                         continue;
2496                 }
2497
2498                 /* Set up revision info for this refspec */
2499                 commit_argc = 3;
2500                 new_sha1_hex = strdup(sha1_to_hex(ref->new_sha1));
2501                 old_sha1_hex = NULL;
2502                 commit_argv[1] = "--objects";
2503                 commit_argv[2] = new_sha1_hex;
2504                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2505                         old_sha1_hex = xmalloc(42);
2506                         sprintf(old_sha1_hex, "^%s",
2507                                 sha1_to_hex(ref->old_sha1));
2508                         commit_argv[3] = old_sha1_hex;
2509                         commit_argc++;
2510                 }
2511                 init_revisions(&revs);
2512                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2513                 free(new_sha1_hex);
2514                 if (old_sha1_hex) {
2515                         free(old_sha1_hex);
2516                         commit_argv[1] = NULL;
2517                 }
2518
2519                 /* Generate a list of objects that need to be pushed */
2520                 pushing = 0;
2521                 prepare_revision_walk(&revs);
2522                 mark_edges_uninteresting(revs.commits);
2523                 objects_to_send = get_delta(&revs, ref_lock);
2524                 finish_all_active_slots();
2525
2526                 /* Push missing objects to remote, this would be a
2527                    convenient time to pack them first if appropriate. */
2528                 pushing = 1;
2529                 if (objects_to_send)
2530                         fprintf(stderr, "    sending %d objects\n",
2531                                 objects_to_send);
2532 #ifdef USE_CURL_MULTI
2533                 fill_active_slots();
2534 #endif
2535                 finish_all_active_slots();
2536
2537                 /* Update the remote branch if all went well */
2538                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2539                         rc = 1;
2540                         goto unlock;
2541                 }
2542
2543         unlock:
2544                 if (!rc)
2545                         fprintf(stderr, "    done\n");
2546                 unlock_remote(ref_lock);
2547                 check_locks();
2548         }
2549
2550         /* Update remote server info if appropriate */
2551         if (remote->has_info_refs && new_refs) {
2552                 if (info_ref_lock && remote->can_update_info_refs) {
2553                         fprintf(stderr, "Updating remote server info\n");
2554                         update_remote_info_refs(info_ref_lock);
2555                 } else {
2556                         fprintf(stderr, "Unable to update server info\n");
2557                 }
2558         }
2559         if (info_ref_lock)
2560                 unlock_remote(info_ref_lock);
2561
2562  cleanup:
2563         free(remote);
2564
2565         curl_slist_free_all(no_pragma_header);
2566         curl_slist_free_all(default_headers);
2567
2568         http_cleanup();
2569
2570         request = request_queue_head;
2571         while (request != NULL) {
2572                 next_request = request->next;
2573                 release_request(request);
2574                 request = next_request;
2575         }
2576
2577         return rc;
2578 }