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

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