http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "blob.h"
   5 #include "http.h"
   6 #include "refs.h"
   7 #include "diff.h"
   8 #include "revision.h"
   9 #include "exec_cmd.h"
  10 #include "remote.h"
  11 #include "list-objects.h"
  12 #include "sigchain.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
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing;
  74 static int aborted;
  75 static signed char remote_dir_exists[256];
  76
  77 static int push_verbosely;
  78 static int push_all = MATCH_REFS_NONE;
  79 static int force_all;
  80 static int dry_run;
  81 static int helper_status;
  82
  83 static struct object_list *objects;
  84
  85 struct repo
  86 {
  87         char *url;
  88         char *path;
  89         int path_len;
  90         int has_info_refs;
  91         int can_update_info_refs;
  92         int has_info_packs;
  93         struct packed_git *packs;
  94         struct remote_lock *locks;
  95 };
  96
  97 static struct repo *repo;
  98
  99 enum transfer_state {
 100         NEED_FETCH,
 101         RUN_FETCH_LOOSE,
 102         RUN_FETCH_PACKED,
 103         NEED_PUSH,
 104         RUN_MKCOL,
 105         RUN_PUT,
 106         RUN_MOVE,
 107         ABORTED,
 108         COMPLETE
 109 };
 110
 111 struct transfer_request
 112 {
 113         struct object *obj;
 114         char *url;
 115         char *dest;
 116         struct remote_lock *lock;
 117         struct curl_slist *headers;
 118         struct buffer buffer;
 119         enum transfer_state state;
 120         CURLcode curl_result;
 121         char errorstr[CURL_ERROR_SIZE];
 122         long http_code;
 123         void *userData;
 124         struct active_request_slot *slot;
 125         struct transfer_request *next;
 126 };
 127
 128 static struct transfer_request *request_queue_head;
 129
 130 struct xml_ctx
 131 {
 132         char *name;
 133         int len;
 134         char *cdata;
 135         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 136         void *userData;
 137 };
 138
 139 struct remote_lock
 140 {
 141         char *url;
 142         char *owner;
 143         char *token;
 144         char tmpfile_suffix[41];
 145         time_t start_time;
 146         long timeout;
 147         int refreshing;
 148         struct remote_lock *next;
 149 };
 150
 151 /* Flags that control remote_ls processing */
 152 #define PROCESS_FILES (1u << 0)
 153 #define PROCESS_DIRS  (1u << 1)
 154 #define RECURSIVE     (1u << 2)
 155
 156 /* Flags that remote_ls passes to callback functions */
 157 #define IS_DIR (1u << 0)
 158
 159 struct remote_ls_ctx
 160 {
 161         char *path;
 162         void (*userFunc)(struct remote_ls_ctx *ls);
 163         void *userData;
 164         int flags;
 165         char *dentry_name;
 166         int dentry_flags;
 167         struct remote_ls_ctx *parent;
 168 };
 169
 170 /* get_dav_token_headers options */
 171 enum dav_header_flag {
 172         DAV_HEADER_IF = (1u << 0),
 173         DAV_HEADER_LOCK = (1u << 1),
 174         DAV_HEADER_TIMEOUT = (1u << 2)
 175 };
 176
 177 static char *xml_entities(char *s)
 178 {
 179         struct strbuf buf = STRBUF_INIT;
 180         while (*s) {
 181                 size_t len = strcspn(s, "\"<>&");
 182                 strbuf_add(&buf, s, len);
 183                 s += len;
 184                 switch (*s) {
 185                 case '"':
 186                         strbuf_addstr(&buf, "&quot;");
 187                         break;
 188                 case '<':
 189                         strbuf_addstr(&buf, "&lt;");
 190                         break;
 191                 case '>':
 192                         strbuf_addstr(&buf, "&gt;");
 193                         break;
 194                 case '&':
 195                         strbuf_addstr(&buf, "&amp;");
 196                         break;
 197                 case 0:
 198                         return strbuf_detach(&buf, NULL);
 199                 }
 200                 s++;
 201         }
 202         return strbuf_detach(&buf, NULL);
 203 }
 204
 205 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 206 {
 207         struct strbuf buf = STRBUF_INIT;
 208         struct curl_slist *dav_headers = NULL;
 209
 210         if (options & DAV_HEADER_IF) {
 211                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 212                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 213                 strbuf_reset(&buf);
 214         }
 215         if (options & DAV_HEADER_LOCK) {
 216                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 217                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 218                 strbuf_reset(&buf);
 219         }
 220         if (options & DAV_HEADER_TIMEOUT) {
 221                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                 strbuf_reset(&buf);
 224         }
 225         strbuf_release(&buf);
 226
 227         return dav_headers;
 228 }
 229
 230 static void finish_request(struct transfer_request *request);
 231 static void release_request(struct transfer_request *request);
 232
 233 static void process_response(void *callback_data)
 234 {
 235         struct transfer_request *request =
 236                 (struct transfer_request *)callback_data;
 237
 238         finish_request(request);
 239 }
 240
 241 #ifdef USE_CURL_MULTI
 242
 243 static void start_fetch_loose(struct transfer_request *request)
 244 {
 245         struct active_request_slot *slot;
 246         struct http_object_request *obj_req;
 247
 248         obj_req = new_http_object_request(repo->url, request->obj->sha1);
 249         if (obj_req == NULL) {
 250                 request->state = ABORTED;
 251                 return;
 252         }
 253
 254         slot = obj_req->slot;
 255         slot->callback_func = process_response;
 256         slot->callback_data = request;
 257         request->slot = slot;
 258         request->userData = obj_req;
 259
 260         /* Try to get the request started, abort the request on error */
 261         request->state = RUN_FETCH_LOOSE;
 262         if (!start_active_slot(slot)) {
 263                 fprintf(stderr, "Unable to start GET request\n");
 264                 repo->can_update_info_refs = 0;
 265                 release_http_object_request(obj_req);
 266                 release_request(request);
 267         }
 268 }
 269
 270 static void start_mkcol(struct transfer_request *request)
 271 {
 272         char *hex = sha1_to_hex(request->obj->sha1);
 273         struct active_request_slot *slot;
 274
 275         request->url = get_remote_object_url(repo->url, hex, 1);
 276
 277         slot = get_active_slot();
 278         slot->callback_func = process_response;
 279         slot->callback_data = request;
 280         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 281         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 282         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 283         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 284         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 285
 286         if (start_active_slot(slot)) {
 287                 request->slot = slot;
 288                 request->state = RUN_MKCOL;
 289         } else {
 290                 request->state = ABORTED;
 291                 free(request->url);
 292                 request->url = NULL;
 293         }
 294 }
 295 #endif
 296
 297 static void start_fetch_packed(struct transfer_request *request)
 298 {
 299         struct packed_git *target;
 300
 301         struct transfer_request *check_request = request_queue_head;
 302         struct http_pack_request *preq;
 303
 304         target = find_sha1_pack(request->obj->sha1, repo->packs);
 305         if (!target) {
 306                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 307                 repo->can_update_info_refs = 0;
 308                 release_request(request);
 309                 return;
 310         }
 311
 312         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 313         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 314
 315         preq = new_http_pack_request(target, repo->url);
 316         if (preq == NULL) {
 317                 release_http_pack_request(preq);
 318                 repo->can_update_info_refs = 0;
 319                 return;
 320         }
 321         preq->lst = &repo->packs;
 322
 323         /* Make sure there isn't another open request for this pack */
 324         while (check_request) {
 325                 if (check_request->state == RUN_FETCH_PACKED &&
 326                     !strcmp(check_request->url, preq->url)) {
 327                         release_http_pack_request(preq);
 328                         release_request(request);
 329                         return;
 330                 }
 331                 check_request = check_request->next;
 332         }
 333
 334         preq->slot->callback_func = process_response;
 335         preq->slot->callback_data = request;
 336         request->slot = preq->slot;
 337         request->userData = preq;
 338
 339         /* Try to get the request started, abort the request on error */
 340         request->state = RUN_FETCH_PACKED;
 341         if (!start_active_slot(preq->slot)) {
 342                 fprintf(stderr, "Unable to start GET request\n");
 343                 release_http_pack_request(preq);
 344                 repo->can_update_info_refs = 0;
 345                 release_request(request);
 346         }
 347 }
 348
 349 static void start_put(struct transfer_request *request)
 350 {
 351         char *hex = sha1_to_hex(request->obj->sha1);
 352         struct active_request_slot *slot;
 353         struct strbuf buf = STRBUF_INIT;
 354         enum object_type type;
 355         char hdr[50];
 356         void *unpacked;
 357         unsigned long len;
 358         int hdrlen;
 359         ssize_t size;
 360         z_stream stream;
 361
 362         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 363         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 364
 365         /* Set it up */
 366         memset(&stream, 0, sizeof(stream));
 367         deflateInit(&stream, zlib_compression_level);
 368         size = deflateBound(&stream, len + hdrlen);
 369         strbuf_init(&request->buffer.buf, size);
 370         request->buffer.posn = 0;
 371
 372         /* Compress it */
 373         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 374         stream.avail_out = size;
 375
 376         /* First header.. */
 377         stream.next_in = (void *)hdr;
 378         stream.avail_in = hdrlen;
 379         while (deflate(&stream, 0) == Z_OK)
 380                 /* nothing */;
 381
 382         /* Then the data itself.. */
 383         stream.next_in = unpacked;
 384         stream.avail_in = len;
 385         while (deflate(&stream, Z_FINISH) == Z_OK)
 386                 /* nothing */;
 387         deflateEnd(&stream);
 388         free(unpacked);
 389
 390         request->buffer.buf.len = stream.total_out;
 391
 392         strbuf_addstr(&buf, "Destination: ");
 393         append_remote_object_url(&buf, repo->url, hex, 0);
 394         request->dest = strbuf_detach(&buf, NULL);
 395
 396         append_remote_object_url(&buf, repo->url, hex, 0);
 397         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 398         request->url = strbuf_detach(&buf, NULL);
 399
 400         slot = get_active_slot();
 401         slot->callback_func = process_response;
 402         slot->callback_data = request;
 403         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 404         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 405         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 406 #ifndef NO_CURL_IOCTL
 407         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 408         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 409 #endif
 410         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 411         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 412         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 413         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 414         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 415         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 416
 417         if (start_active_slot(slot)) {
 418                 request->slot = slot;
 419                 request->state = RUN_PUT;
 420         } else {
 421                 request->state = ABORTED;
 422                 free(request->url);
 423                 request->url = NULL;
 424         }
 425 }
 426
 427 static void start_move(struct transfer_request *request)
 428 {
 429         struct active_request_slot *slot;
 430         struct curl_slist *dav_headers = NULL;
 431
 432         slot = get_active_slot();
 433         slot->callback_func = process_response;
 434         slot->callback_data = request;
 435         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 436         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 437         dav_headers = curl_slist_append(dav_headers, request->dest);
 438         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 439         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 440         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 441         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 442
 443         if (start_active_slot(slot)) {
 444                 request->slot = slot;
 445                 request->state = RUN_MOVE;
 446         } else {
 447                 request->state = ABORTED;
 448                 free(request->url);
 449                 request->url = NULL;
 450         }
 451 }
 452
 453 static int refresh_lock(struct remote_lock *lock)
 454 {
 455         struct active_request_slot *slot;
 456         struct slot_results results;
 457         struct curl_slist *dav_headers;
 458         int rc = 0;
 459
 460         lock->refreshing = 1;
 461
 462         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 463
 464         slot = get_active_slot();
 465         slot->results = &results;
 466         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 467         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 468         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 469         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 470         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 471
 472         if (start_active_slot(slot)) {
 473                 run_active_slot(slot);
 474                 if (results.curl_result != CURLE_OK) {
 475                         fprintf(stderr, "LOCK HTTP error %ld\n",
 476                                 results.http_code);
 477                 } else {
 478                         lock->start_time = time(NULL);
 479                         rc = 1;
 480                 }
 481         }
 482
 483         lock->refreshing = 0;
 484         curl_slist_free_all(dav_headers);
 485
 486         return rc;
 487 }
 488
 489 static void check_locks(void)
 490 {
 491         struct remote_lock *lock = repo->locks;
 492         time_t current_time = time(NULL);
 493         int time_remaining;
 494
 495         while (lock) {
 496                 time_remaining = lock->start_time + lock->timeout -
 497                         current_time;
 498                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 499                         if (!refresh_lock(lock)) {
 500                                 fprintf(stderr,
 501                                         "Unable to refresh lock for %s\n",
 502                                         lock->url);
 503                                 aborted = 1;
 504                                 return;
 505                         }
 506                 }
 507                 lock = lock->next;
 508         }
 509 }
 510
 511 static void release_request(struct transfer_request *request)
 512 {
 513         struct transfer_request *entry = request_queue_head;
 514
 515         if (request == request_queue_head) {
 516                 request_queue_head = request->next;
 517         } else {
 518                 while (entry->next != NULL && entry->next != request)
 519                         entry = entry->next;
 520                 if (entry->next == request)
 521                         entry->next = entry->next->next;
 522         }
 523
 524         free(request->url);
 525         free(request);
 526 }
 527
 528 static void finish_request(struct transfer_request *request)
 529 {
 530         struct http_pack_request *preq;
 531         struct http_object_request *obj_req;
 532
 533         request->curl_result = request->slot->curl_result;
 534         request->http_code = request->slot->http_code;
 535         request->slot = NULL;
 536
 537         /* Keep locks active */
 538         check_locks();
 539
 540         if (request->headers != NULL)
 541                 curl_slist_free_all(request->headers);
 542
 543         /* URL is reused for MOVE after PUT */
 544         if (request->state != RUN_PUT) {
 545                 free(request->url);
 546                 request->url = NULL;
 547         }
 548
 549         if (request->state == RUN_MKCOL) {
 550                 if (request->curl_result == CURLE_OK ||
 551                     request->http_code == 405) {
 552                         remote_dir_exists[request->obj->sha1[0]] = 1;
 553                         start_put(request);
 554                 } else {
 555                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 556                                 sha1_to_hex(request->obj->sha1),
 557                                 request->curl_result, request->http_code);
 558                         request->state = ABORTED;
 559                         aborted = 1;
 560                 }
 561         } else if (request->state == RUN_PUT) {
 562                 if (request->curl_result == CURLE_OK) {
 563                         start_move(request);
 564                 } else {
 565                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 566                                 sha1_to_hex(request->obj->sha1),
 567                                 request->curl_result, request->http_code);
 568                         request->state = ABORTED;
 569                         aborted = 1;
 570                 }
 571         } else if (request->state == RUN_MOVE) {
 572                 if (request->curl_result == CURLE_OK) {
 573                         if (push_verbosely)
 574                                 fprintf(stderr, "    sent %s\n",
 575                                         sha1_to_hex(request->obj->sha1));
 576                         request->obj->flags |= REMOTE;
 577                         release_request(request);
 578                 } else {
 579                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 580                                 sha1_to_hex(request->obj->sha1),
 581                                 request->curl_result, request->http_code);
 582                         request->state = ABORTED;
 583                         aborted = 1;
 584                 }
 585         } else if (request->state == RUN_FETCH_LOOSE) {
 586                 obj_req = (struct http_object_request *)request->userData;
 587
 588                 if (finish_http_object_request(obj_req) == 0)
 589                         if (obj_req->rename == 0)
 590                                 request->obj->flags |= (LOCAL | REMOTE);
 591
 592                 /* Try fetching packed if necessary */
 593                 if (request->obj->flags & LOCAL) {
 594                         release_http_object_request(obj_req);
 595                         release_request(request);
 596                 } else
 597                         start_fetch_packed(request);
 598
 599         } else if (request->state == RUN_FETCH_PACKED) {
 600                 int fail = 1;
 601                 if (request->curl_result != CURLE_OK) {
 602                         fprintf(stderr, "Unable to get pack file %s\n%s",
 603                                 request->url, curl_errorstr);
 604                 } else {
 605                         preq = (struct http_pack_request *)request->userData;
 606
 607                         if (preq) {
 608                                 if (finish_http_pack_request(preq) == 0)
 609                                         fail = 0;
 610                                 release_http_pack_request(preq);
 611                         }
 612                 }
 613                 if (fail)
 614                         repo->can_update_info_refs = 0;
 615                 release_request(request);
 616         }
 617 }
 618
 619 #ifdef USE_CURL_MULTI
 620 static int is_running_queue;
 621 static int fill_active_slot(void *unused)
 622 {
 623         struct transfer_request *request;
 624
 625         if (aborted || !is_running_queue)
 626                 return 0;
 627
 628         for (request = request_queue_head; request; request = request->next) {
 629                 if (request->state == NEED_FETCH) {
 630                         start_fetch_loose(request);
 631                         return 1;
 632                 } else if (pushing && request->state == NEED_PUSH) {
 633                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 634                                 start_put(request);
 635                         } else {
 636                                 start_mkcol(request);
 637                         }
 638                         return 1;
 639                 }
 640         }
 641         return 0;
 642 }
 643 #endif
 644
 645 static void get_remote_object_list(unsigned char parent);
 646
 647 static void add_fetch_request(struct object *obj)
 648 {
 649         struct transfer_request *request;
 650
 651         check_locks();
 652
 653         /*
 654          * Don't fetch the object if it's known to exist locally
 655          * or is already in the request queue
 656          */
 657         if (remote_dir_exists[obj->sha1[0]] == -1)
 658                 get_remote_object_list(obj->sha1[0]);
 659         if (obj->flags & (LOCAL | FETCHING))
 660                 return;
 661
 662         obj->flags |= FETCHING;
 663         request = xmalloc(sizeof(*request));
 664         request->obj = obj;
 665         request->url = NULL;
 666         request->lock = NULL;
 667         request->headers = NULL;
 668         request->state = NEED_FETCH;
 669         request->next = request_queue_head;
 670         request_queue_head = request;
 671
 672 #ifdef USE_CURL_MULTI
 673         fill_active_slots();
 674         step_active_slots();
 675 #endif
 676 }
 677
 678 static int add_send_request(struct object *obj, struct remote_lock *lock)
 679 {
 680         struct transfer_request *request = request_queue_head;
 681         struct packed_git *target;
 682
 683         /* Keep locks active */
 684         check_locks();
 685
 686         /*
 687          * Don't push the object if it's known to exist on the remote
 688          * or is already in the request queue
 689          */
 690         if (remote_dir_exists[obj->sha1[0]] == -1)
 691                 get_remote_object_list(obj->sha1[0]);
 692         if (obj->flags & (REMOTE | PUSHING))
 693                 return 0;
 694         target = find_sha1_pack(obj->sha1, repo->packs);
 695         if (target) {
 696                 obj->flags |= REMOTE;
 697                 return 0;
 698         }
 699
 700         obj->flags |= PUSHING;
 701         request = xmalloc(sizeof(*request));
 702         request->obj = obj;
 703         request->url = NULL;
 704         request->lock = lock;
 705         request->headers = NULL;
 706         request->state = NEED_PUSH;
 707         request->next = request_queue_head;
 708         request_queue_head = request;
 709
 710 #ifdef USE_CURL_MULTI
 711         fill_active_slots();
 712         step_active_slots();
 713 #endif
 714
 715         return 1;
 716 }
 717
 718 static int fetch_indices(void)
 719 {
 720         int ret;
 721
 722         if (push_verbosely)
 723                 fprintf(stderr, "Getting pack list\n");
 724
 725         switch (http_get_info_packs(repo->url, &repo->packs)) {
 726         case HTTP_OK:
 727         case HTTP_MISSING_TARGET:
 728                 ret = 0;
 729                 break;
 730         default:
 731                 ret = -1;
 732         }
 733
 734         return ret;
 735 }
 736
 737 static void one_remote_object(const char *hex)
 738 {
 739         unsigned char sha1[20];
 740         struct object *obj;
 741
 742         if (get_sha1_hex(hex, sha1) != 0)
 743                 return;
 744
 745         obj = lookup_object(sha1);
 746         if (!obj)
 747                 obj = parse_object(sha1);
 748
 749         /* Ignore remote objects that don't exist locally */
 750         if (!obj)
 751                 return;
 752
 753         obj->flags |= REMOTE;
 754         if (!object_list_contains(objects, obj))
 755                 object_list_insert(obj, &objects);
 756 }
 757
 758 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 759 {
 760         int *lock_flags = (int *)ctx->userData;
 761
 762         if (tag_closed) {
 763                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 764                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 765                             (*lock_flags & DAV_PROP_LOCKWR)) {
 766                                 *lock_flags |= DAV_LOCK_OK;
 767                         }
 768                         *lock_flags &= DAV_LOCK_OK;
 769                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 770                         *lock_flags |= DAV_PROP_LOCKWR;
 771                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 772                         *lock_flags |= DAV_PROP_LOCKEX;
 773                 }
 774         }
 775 }
 776
 777 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 778 {
 779         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 780         git_SHA_CTX sha_ctx;
 781         unsigned char lock_token_sha1[20];
 782
 783         if (tag_closed && ctx->cdata) {
 784                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 785                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 786                         strcpy(lock->owner, ctx->cdata);
 787                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 788                         if (!prefixcmp(ctx->cdata, "Second-"))
 789                                 lock->timeout =
 790                                         strtol(ctx->cdata + 7, NULL, 10);
 791                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 792                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
 793                         strcpy(lock->token, ctx->cdata);
 794
 795                         git_SHA1_Init(&sha_ctx);
 796                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 797                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
 798
 799                         lock->tmpfile_suffix[0] = '_';
 800                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 801                 }
 802         }
 803 }
 804
 805 static void one_remote_ref(char *refname);
 806
 807 static void
 808 xml_start_tag(void *userData, const char *name, const char **atts)
 809 {
 810         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 811         const char *c = strchr(name, ':');
 812         int new_len;
 813
 814         if (c == NULL)
 815                 c = name;
 816         else
 817                 c++;
 818
 819         new_len = strlen(ctx->name) + strlen(c) + 2;
 820
 821         if (new_len > ctx->len) {
 822                 ctx->name = xrealloc(ctx->name, new_len);
 823                 ctx->len = new_len;
 824         }
 825         strcat(ctx->name, ".");
 826         strcat(ctx->name, c);
 827
 828         free(ctx->cdata);
 829         ctx->cdata = NULL;
 830
 831         ctx->userFunc(ctx, 0);
 832 }
 833
 834 static void
 835 xml_end_tag(void *userData, const char *name)
 836 {
 837         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 838         const char *c = strchr(name, ':');
 839         char *ep;
 840
 841         ctx->userFunc(ctx, 1);
 842
 843         if (c == NULL)
 844                 c = name;
 845         else
 846                 c++;
 847
 848         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 849         *ep = 0;
 850 }
 851
 852 static void
 853 xml_cdata(void *userData, const XML_Char *s, int len)
 854 {
 855         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 856         free(ctx->cdata);
 857         ctx->cdata = xmemdupz(s, len);
 858 }
 859
 860 static struct remote_lock *lock_remote(const char *path, long timeout)
 861 {
 862         struct active_request_slot *slot;
 863         struct slot_results results;
 864         struct buffer out_buffer = { STRBUF_INIT, 0 };
 865         struct strbuf in_buffer = STRBUF_INIT;
 866         char *url;
 867         char *ep;
 868         char timeout_header[25];
 869         struct remote_lock *lock = NULL;
 870         struct curl_slist *dav_headers = NULL;
 871         struct xml_ctx ctx;
 872         char *escaped;
 873
 874         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
 875         sprintf(url, "%s%s", repo->url, path);
 876
 877         /* Make sure leading directories exist for the remote ref */
 878         ep = strchr(url + strlen(repo->url) + 1, '/');
 879         while (ep) {
 880                 char saved_character = ep[1];
 881                 ep[1] = '\0';
 882                 slot = get_active_slot();
 883                 slot->results = &results;
 884                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 885                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 886                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 887                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 888                 if (start_active_slot(slot)) {
 889                         run_active_slot(slot);
 890                         if (results.curl_result != CURLE_OK &&
 891                             results.http_code != 405) {
 892                                 fprintf(stderr,
 893                                         "Unable to create branch path %s\n",
 894                                         url);
 895                                 free(url);
 896                                 return NULL;
 897                         }
 898                 } else {
 899                         fprintf(stderr, "Unable to start MKCOL request\n");
 900                         free(url);
 901                         return NULL;
 902                 }
 903                 ep[1] = saved_character;
 904                 ep = strchr(ep + 1, '/');
 905         }
 906
 907         escaped = xml_entities(git_default_email);
 908         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 909         free(escaped);
 910
 911         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
 912         dav_headers = curl_slist_append(dav_headers, timeout_header);
 913         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 914
 915         slot = get_active_slot();
 916         slot->results = &results;
 917         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
 918         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
 919         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 920 #ifndef NO_CURL_IOCTL
 921         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 922         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
 923 #endif
 924         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 925         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 926         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 927         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 928         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 929         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 930
 931         lock = xcalloc(1, sizeof(*lock));
 932         lock->timeout = -1;
 933
 934         if (start_active_slot(slot)) {
 935                 run_active_slot(slot);
 936                 if (results.curl_result == CURLE_OK) {
 937                         XML_Parser parser = XML_ParserCreate(NULL);
 938                         enum XML_Status result;
 939                         ctx.name = xcalloc(10, 1);
 940                         ctx.len = 0;
 941                         ctx.cdata = NULL;
 942                         ctx.userFunc = handle_new_lock_ctx;
 943                         ctx.userData = lock;
 944                         XML_SetUserData(parser, &ctx);
 945                         XML_SetElementHandler(parser, xml_start_tag,
 946                                               xml_end_tag);
 947                         XML_SetCharacterDataHandler(parser, xml_cdata);
 948                         result = XML_Parse(parser, in_buffer.buf,
 949                                            in_buffer.len, 1);
 950                         free(ctx.name);
 951                         if (result != XML_STATUS_OK) {
 952                                 fprintf(stderr, "XML error: %s\n",
 953                                         XML_ErrorString(
 954                                                 XML_GetErrorCode(parser)));
 955                                 lock->timeout = -1;
 956                         }
 957                         XML_ParserFree(parser);
 958                 }
 959         } else {
 960                 fprintf(stderr, "Unable to start LOCK request\n");
 961         }
 962
 963         curl_slist_free_all(dav_headers);
 964         strbuf_release(&out_buffer.buf);
 965         strbuf_release(&in_buffer);
 966
 967         if (lock->token == NULL || lock->timeout <= 0) {
 968                 free(lock->token);
 969                 free(lock->owner);
 970                 free(url);
 971                 free(lock);
 972                 lock = NULL;
 973         } else {
 974                 lock->url = url;
 975                 lock->start_time = time(NULL);
 976                 lock->next = repo->locks;
 977                 repo->locks = lock;
 978         }
 979
 980         return lock;
 981 }
 982
 983 static int unlock_remote(struct remote_lock *lock)
 984 {
 985         struct active_request_slot *slot;
 986         struct slot_results results;
 987         struct remote_lock *prev = repo->locks;
 988         struct curl_slist *dav_headers;
 989         int rc = 0;
 990
 991         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 992
 993         slot = get_active_slot();
 994         slot->results = &results;
 995         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 996         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 997         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
 998         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 999
1000         if (start_active_slot(slot)) {
1001                 run_active_slot(slot);
1002                 if (results.curl_result == CURLE_OK)
1003                         rc = 1;
1004                 else
1005                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1006                                 results.http_code);
1007         } else {
1008                 fprintf(stderr, "Unable to start UNLOCK request\n");
1009         }
1010
1011         curl_slist_free_all(dav_headers);
1012
1013         if (repo->locks == lock) {
1014                 repo->locks = lock->next;
1015         } else {
1016                 while (prev && prev->next != lock)
1017                         prev = prev->next;
1018                 if (prev)
1019                         prev->next = prev->next->next;
1020         }
1021
1022         free(lock->owner);
1023         free(lock->url);
1024         free(lock->token);
1025         free(lock);
1026
1027         return rc;
1028 }
1029
1030 static void remove_locks(void)
1031 {
1032         struct remote_lock *lock = repo->locks;
1033
1034         fprintf(stderr, "Removing remote locks...\n");
1035         while (lock) {
1036                 struct remote_lock *next = lock->next;
1037                 unlock_remote(lock);
1038                 lock = next;
1039         }
1040 }
1041
1042 static void remove_locks_on_signal(int signo)
1043 {
1044         remove_locks();
1045         sigchain_pop(signo);
1046         raise(signo);
1047 }
1048
1049 static void remote_ls(const char *path, int flags,
1050                       void (*userFunc)(struct remote_ls_ctx *ls),
1051                       void *userData);
1052
1053 static void process_ls_object(struct remote_ls_ctx *ls)
1054 {
1055         unsigned int *parent = (unsigned int *)ls->userData;
1056         char *path = ls->dentry_name;
1057         char *obj_hex;
1058
1059         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1060                 remote_dir_exists[*parent] = 1;
1061                 return;
1062         }
1063
1064         if (strlen(path) != 49)
1065                 return;
1066         path += 8;
1067         obj_hex = xmalloc(strlen(path));
1068         /* NB: path is not null-terminated, can not use strlcpy here */
1069         memcpy(obj_hex, path, 2);
1070         strcpy(obj_hex + 2, path + 3);
1071         one_remote_object(obj_hex);
1072         free(obj_hex);
1073 }
1074
1075 static void process_ls_ref(struct remote_ls_ctx *ls)
1076 {
1077         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1078                 fprintf(stderr, "  %s\n", ls->dentry_name);
1079                 return;
1080         }
1081
1082         if (!(ls->dentry_flags & IS_DIR))
1083                 one_remote_ref(ls->dentry_name);
1084 }
1085
1086 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1087 {
1088         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1089
1090         if (tag_closed) {
1091                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1092                         if (ls->dentry_flags & IS_DIR) {
1093
1094                                 /* ensure collection names end with slash */
1095                                 str_end_url_with_slash(ls->dentry_name, &ls->dentry_name);
1096
1097                                 if (ls->flags & PROCESS_DIRS) {
1098                                         ls->userFunc(ls);
1099                                 }
1100                                 if (strcmp(ls->dentry_name, ls->path) &&
1101                                     ls->flags & RECURSIVE) {
1102                                         remote_ls(ls->dentry_name,
1103                                                   ls->flags,
1104                                                   ls->userFunc,
1105                                                   ls->userData);
1106                                 }
1107                         } else if (ls->flags & PROCESS_FILES) {
1108                                 ls->userFunc(ls);
1109                         }
1110                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1111                         char *path = ctx->cdata;
1112                         if (*ctx->cdata == 'h') {
1113                                 path = strstr(path, "//");
1114                                 if (path) {
1115                                         path = strchr(path+2, '/');
1116                                 }
1117                         }
1118                         if (path) {
1119                                 path += repo->path_len;
1120                                 ls->dentry_name = xstrdup(path);
1121                         }
1122                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1123                         ls->dentry_flags |= IS_DIR;
1124                 }
1125         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1126                 free(ls->dentry_name);
1127                 ls->dentry_name = NULL;
1128                 ls->dentry_flags = 0;
1129         }
1130 }
1131
1132 /*
1133  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1134  * should _only_ heed the information from that file, instead of trying to
1135  * determine the refs from the remote file system (badly: it does not even
1136  * know about packed-refs).
1137  */
1138 static void remote_ls(const char *path, int flags,
1139                       void (*userFunc)(struct remote_ls_ctx *ls),
1140                       void *userData)
1141 {
1142         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1143         struct active_request_slot *slot;
1144         struct slot_results results;
1145         struct strbuf in_buffer = STRBUF_INIT;
1146         struct buffer out_buffer = { STRBUF_INIT, 0 };
1147         struct curl_slist *dav_headers = NULL;
1148         struct xml_ctx ctx;
1149         struct remote_ls_ctx ls;
1150
1151         ls.flags = flags;
1152         ls.path = xstrdup(path);
1153         ls.dentry_name = NULL;
1154         ls.dentry_flags = 0;
1155         ls.userData = userData;
1156         ls.userFunc = userFunc;
1157
1158         sprintf(url, "%s%s", repo->url, path);
1159
1160         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1161
1162         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1163         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1164
1165         slot = get_active_slot();
1166         slot->results = &results;
1167         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1168         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1169         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1170 #ifndef NO_CURL_IOCTL
1171         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1172         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1173 #endif
1174         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1175         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1176         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1177         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1178         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1179         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1180
1181         if (start_active_slot(slot)) {
1182                 run_active_slot(slot);
1183                 if (results.curl_result == CURLE_OK) {
1184                         XML_Parser parser = XML_ParserCreate(NULL);
1185                         enum XML_Status result;
1186                         ctx.name = xcalloc(10, 1);
1187                         ctx.len = 0;
1188                         ctx.cdata = NULL;
1189                         ctx.userFunc = handle_remote_ls_ctx;
1190                         ctx.userData = &ls;
1191                         XML_SetUserData(parser, &ctx);
1192                         XML_SetElementHandler(parser, xml_start_tag,
1193                                               xml_end_tag);
1194                         XML_SetCharacterDataHandler(parser, xml_cdata);
1195                         result = XML_Parse(parser, in_buffer.buf,
1196                                            in_buffer.len, 1);
1197                         free(ctx.name);
1198
1199                         if (result != XML_STATUS_OK) {
1200                                 fprintf(stderr, "XML error: %s\n",
1201                                         XML_ErrorString(
1202                                                 XML_GetErrorCode(parser)));
1203                         }
1204                         XML_ParserFree(parser);
1205                 }
1206         } else {
1207                 fprintf(stderr, "Unable to start PROPFIND request\n");
1208         }
1209
1210         free(ls.path);
1211         free(url);
1212         strbuf_release(&out_buffer.buf);
1213         strbuf_release(&in_buffer);
1214         curl_slist_free_all(dav_headers);
1215 }
1216
1217 static void get_remote_object_list(unsigned char parent)
1218 {
1219         char path[] = "objects/XX/";
1220         static const char hex[] = "0123456789abcdef";
1221         unsigned int val = parent;
1222
1223         path[8] = hex[val >> 4];
1224         path[9] = hex[val & 0xf];
1225         remote_dir_exists[val] = 0;
1226         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1227                   process_ls_object, &val);
1228 }
1229
1230 static int locking_available(void)
1231 {
1232         struct active_request_slot *slot;
1233         struct slot_results results;
1234         struct strbuf in_buffer = STRBUF_INIT;
1235         struct buffer out_buffer = { STRBUF_INIT, 0 };
1236         struct curl_slist *dav_headers = NULL;
1237         struct xml_ctx ctx;
1238         int lock_flags = 0;
1239         char *escaped;
1240
1241         escaped = xml_entities(repo->url);
1242         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1243         free(escaped);
1244
1245         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1246         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1247
1248         slot = get_active_slot();
1249         slot->results = &results;
1250         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1251         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1252         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1253 #ifndef NO_CURL_IOCTL
1254         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1255         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1256 #endif
1257         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1258         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1259         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1260         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1261         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1262         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1263
1264         if (start_active_slot(slot)) {
1265                 run_active_slot(slot);
1266                 if (results.curl_result == CURLE_OK) {
1267                         XML_Parser parser = XML_ParserCreate(NULL);
1268                         enum XML_Status result;
1269                         ctx.name = xcalloc(10, 1);
1270                         ctx.len = 0;
1271                         ctx.cdata = NULL;
1272                         ctx.userFunc = handle_lockprop_ctx;
1273                         ctx.userData = &lock_flags;
1274                         XML_SetUserData(parser, &ctx);
1275                         XML_SetElementHandler(parser, xml_start_tag,
1276                                               xml_end_tag);
1277                         result = XML_Parse(parser, in_buffer.buf,
1278                                            in_buffer.len, 1);
1279                         free(ctx.name);
1280
1281                         if (result != XML_STATUS_OK) {
1282                                 fprintf(stderr, "XML error: %s\n",
1283                                         XML_ErrorString(
1284                                                 XML_GetErrorCode(parser)));
1285                                 lock_flags = 0;
1286                         }
1287                         XML_ParserFree(parser);
1288                         if (!lock_flags)
1289                                 error("no DAV locking support on %s",
1290                                       repo->url);
1291
1292                 } else {
1293                         error("Cannot access URL %s, return code %d",
1294                               repo->url, results.curl_result);
1295                         lock_flags = 0;
1296                 }
1297         } else {
1298                 error("Unable to start PROPFIND request on %s", repo->url);
1299         }
1300
1301         strbuf_release(&out_buffer.buf);
1302         strbuf_release(&in_buffer);
1303         curl_slist_free_all(dav_headers);
1304
1305         return lock_flags;
1306 }
1307
1308 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1309 {
1310         struct object_list *entry = xmalloc(sizeof(struct object_list));
1311         entry->item = obj;
1312         entry->next = *p;
1313         *p = entry;
1314         return &entry->next;
1315 }
1316
1317 static struct object_list **process_blob(struct blob *blob,
1318                                          struct object_list **p,
1319                                          struct name_path *path,
1320                                          const char *name)
1321 {
1322         struct object *obj = &blob->object;
1323
1324         obj->flags |= LOCAL;
1325
1326         if (obj->flags & (UNINTERESTING | SEEN))
1327                 return p;
1328
1329         obj->flags |= SEEN;
1330         return add_one_object(obj, p);
1331 }
1332
1333 static struct object_list **process_tree(struct tree *tree,
1334                                          struct object_list **p,
1335                                          struct name_path *path,
1336                                          const char *name)
1337 {
1338         struct object *obj = &tree->object;
1339         struct tree_desc desc;
1340         struct name_entry entry;
1341         struct name_path me;
1342
1343         obj->flags |= LOCAL;
1344
1345         if (obj->flags & (UNINTERESTING | SEEN))
1346                 return p;
1347         if (parse_tree(tree) < 0)
1348                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1349
1350         obj->flags |= SEEN;
1351         name = xstrdup(name);
1352         p = add_one_object(obj, p);
1353         me.up = path;
1354         me.elem = name;
1355         me.elem_len = strlen(name);
1356
1357         init_tree_desc(&desc, tree->buffer, tree->size);
1358
1359         while (tree_entry(&desc, &entry))
1360                 switch (object_type(entry.mode)) {
1361                 case OBJ_TREE:
1362                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1363                         break;
1364                 case OBJ_BLOB:
1365                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1366                         break;
1367                 default:
1368                         /* Subproject commit - not in this repository */
1369                         break;
1370                 }
1371
1372         free(tree->buffer);
1373         tree->buffer = NULL;
1374         return p;
1375 }
1376
1377 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1378 {
1379         int i;
1380         struct commit *commit;
1381         struct object_list **p = &objects;
1382         int count = 0;
1383
1384         while ((commit = get_revision(revs)) != NULL) {
1385                 p = process_tree(commit->tree, p, NULL, "");
1386                 commit->object.flags |= LOCAL;
1387                 if (!(commit->object.flags & UNINTERESTING))
1388                         count += add_send_request(&commit->object, lock);
1389         }
1390
1391         for (i = 0; i < revs->pending.nr; i++) {
1392                 struct object_array_entry *entry = revs->pending.objects + i;
1393                 struct object *obj = entry->item;
1394                 const char *name = entry->name;
1395
1396                 if (obj->flags & (UNINTERESTING | SEEN))
1397                         continue;
1398                 if (obj->type == OBJ_TAG) {
1399                         obj->flags |= SEEN;
1400                         p = add_one_object(obj, p);
1401                         continue;
1402                 }
1403                 if (obj->type == OBJ_TREE) {
1404                         p = process_tree((struct tree *)obj, p, NULL, name);
1405                         continue;
1406                 }
1407                 if (obj->type == OBJ_BLOB) {
1408                         p = process_blob((struct blob *)obj, p, NULL, name);
1409                         continue;
1410                 }
1411                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1412         }
1413
1414         while (objects) {
1415                 if (!(objects->item->flags & UNINTERESTING))
1416                         count += add_send_request(objects->item, lock);
1417                 objects = objects->next;
1418         }
1419
1420         return count;
1421 }
1422
1423 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1424 {
1425         struct active_request_slot *slot;
1426         struct slot_results results;
1427         struct buffer out_buffer = { STRBUF_INIT, 0 };
1428         struct curl_slist *dav_headers;
1429
1430         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1431
1432         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1433
1434         slot = get_active_slot();
1435         slot->results = &results;
1436         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1437         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1438         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1439 #ifndef NO_CURL_IOCTL
1440         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1441         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1442 #endif
1443         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1444         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1445         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1446         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1447         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1448         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1449
1450         if (start_active_slot(slot)) {
1451                 run_active_slot(slot);
1452                 strbuf_release(&out_buffer.buf);
1453                 if (results.curl_result != CURLE_OK) {
1454                         fprintf(stderr,
1455                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1456                                 results.curl_result, results.http_code);
1457                         /* We should attempt recovery? */
1458                         return 0;
1459                 }
1460         } else {
1461                 strbuf_release(&out_buffer.buf);
1462                 fprintf(stderr, "Unable to start PUT request\n");
1463                 return 0;
1464         }
1465
1466         return 1;
1467 }
1468
1469 static struct ref *remote_refs;
1470
1471 static void one_remote_ref(char *refname)
1472 {
1473         struct ref *ref;
1474         struct object *obj;
1475
1476         ref = alloc_ref(refname);
1477
1478         if (http_fetch_ref(repo->url, ref) != 0) {
1479                 fprintf(stderr,
1480                         "Unable to fetch ref %s from %s\n",
1481                         refname, repo->url);
1482                 free(ref);
1483                 return;
1484         }
1485
1486         /*
1487          * Fetch a copy of the object if it doesn't exist locally - it
1488          * may be required for updating server info later.
1489          */
1490         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1491                 obj = lookup_unknown_object(ref->old_sha1);
1492                 if (obj) {
1493                         fprintf(stderr, "  fetch %s for %s\n",
1494                                 sha1_to_hex(ref->old_sha1), refname);
1495                         add_fetch_request(obj);
1496                 }
1497         }
1498
1499         ref->next = remote_refs;
1500         remote_refs = ref;
1501 }
1502
1503 static void get_dav_remote_heads(void)
1504 {
1505         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1506 }
1507
1508 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1509 {
1510         struct strbuf *buf = (struct strbuf *)ls->userData;
1511         struct object *o;
1512         int len;
1513         char *ref_info;
1514         struct ref *ref;
1515
1516         ref = alloc_ref(ls->dentry_name);
1517
1518         if (http_fetch_ref(repo->url, ref) != 0) {
1519                 fprintf(stderr,
1520                         "Unable to fetch ref %s from %s\n",
1521                         ls->dentry_name, repo->url);
1522                 aborted = 1;
1523                 free(ref);
1524                 return;
1525         }
1526
1527         o = parse_object(ref->old_sha1);
1528         if (!o) {
1529                 fprintf(stderr,
1530                         "Unable to parse object %s for remote ref %s\n",
1531                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1532                 aborted = 1;
1533                 free(ref);
1534                 return;
1535         }
1536
1537         len = strlen(ls->dentry_name) + 42;
1538         ref_info = xcalloc(len + 1, 1);
1539         sprintf(ref_info, "%s   %s\n",
1540                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1541         fwrite_buffer(ref_info, 1, len, buf);
1542         free(ref_info);
1543
1544         if (o->type == OBJ_TAG) {
1545                 o = deref_tag(o, ls->dentry_name, 0);
1546                 if (o) {
1547                         len = strlen(ls->dentry_name) + 45;
1548                         ref_info = xcalloc(len + 1, 1);
1549                         sprintf(ref_info, "%s   %s^{}\n",
1550                                 sha1_to_hex(o->sha1), ls->dentry_name);
1551                         fwrite_buffer(ref_info, 1, len, buf);
1552                         free(ref_info);
1553                 }
1554         }
1555         free(ref);
1556 }
1557
1558 static void update_remote_info_refs(struct remote_lock *lock)
1559 {
1560         struct buffer buffer = { STRBUF_INIT, 0 };
1561         struct active_request_slot *slot;
1562         struct slot_results results;
1563         struct curl_slist *dav_headers;
1564
1565         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1566                   add_remote_info_ref, &buffer.buf);
1567         if (!aborted) {
1568                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1569
1570                 slot = get_active_slot();
1571                 slot->results = &results;
1572                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1573                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1574                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1575 #ifndef NO_CURL_IOCTL
1576                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1577                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1578 #endif
1579                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1580                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1581                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1582                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1583                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1584                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1585
1586                 if (start_active_slot(slot)) {
1587                         run_active_slot(slot);
1588                         if (results.curl_result != CURLE_OK) {
1589                                 fprintf(stderr,
1590                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1591                                         results.curl_result, results.http_code);
1592                         }
1593                 }
1594         }
1595         strbuf_release(&buffer.buf);
1596 }
1597
1598 static int remote_exists(const char *path)
1599 {
1600         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1601         int ret;
1602
1603         sprintf(url, "%s%s", repo->url, path);
1604
1605         switch (http_get_strbuf(url, NULL, 0)) {
1606         case HTTP_OK:
1607                 ret = 1;
1608                 break;
1609         case HTTP_MISSING_TARGET:
1610                 ret = 0;
1611                 break;
1612         case HTTP_ERROR:
1613                 http_error(url, HTTP_ERROR);
1614         default:
1615                 ret = -1;
1616         }
1617         free(url);
1618         return ret;
1619 }
1620
1621 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1622 {
1623         char *url;
1624         struct strbuf buffer = STRBUF_INIT;
1625
1626         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1627         sprintf(url, "%s%s", repo->url, path);
1628
1629         if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1630                 die("Couldn't get %s for remote symref\n%s", url,
1631                     curl_errorstr);
1632         free(url);
1633
1634         free(*symref);
1635         *symref = NULL;
1636         hashclr(sha1);
1637
1638         if (buffer.len == 0)
1639                 return;
1640
1641         /* If it's a symref, set the refname; otherwise try for a sha1 */
1642         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1643                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1644         } else {
1645                 get_sha1_hex(buffer.buf, sha1);
1646         }
1647
1648         strbuf_release(&buffer);
1649 }
1650
1651 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
1652 {
1653         struct commit *head = lookup_commit(head_sha1);
1654         struct commit *branch = lookup_commit(branch_sha1);
1655         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
1656
1657         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
1658 }
1659
1660 static int delete_remote_branch(char *pattern, int force)
1661 {
1662         struct ref *refs = remote_refs;
1663         struct ref *remote_ref = NULL;
1664         unsigned char head_sha1[20];
1665         char *symref = NULL;
1666         int match;
1667         int patlen = strlen(pattern);
1668         int i;
1669         struct active_request_slot *slot;
1670         struct slot_results results;
1671         char *url;
1672
1673         /* Find the remote branch(es) matching the specified branch name */
1674         for (match = 0; refs; refs = refs->next) {
1675                 char *name = refs->name;
1676                 int namelen = strlen(name);
1677                 if (namelen < patlen ||
1678                     memcmp(name + namelen - patlen, pattern, patlen))
1679                         continue;
1680                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1681                         continue;
1682                 match++;
1683                 remote_ref = refs;
1684         }
1685         if (match == 0)
1686                 return error("No remote branch matches %s", pattern);
1687         if (match != 1)
1688                 return error("More than one remote branch matches %s",
1689                              pattern);
1690
1691         /*
1692          * Remote HEAD must be a symref (not exactly foolproof; a remote
1693          * symlink to a symref will look like a symref)
1694          */
1695         fetch_symref("HEAD", &symref, head_sha1);
1696         if (!symref)
1697                 return error("Remote HEAD is not a symref");
1698
1699         /* Remote branch must not be the remote HEAD */
1700         for (i=0; symref && i<MAXDEPTH; i++) {
1701                 if (!strcmp(remote_ref->name, symref))
1702                         return error("Remote branch %s is the current HEAD",
1703                                      remote_ref->name);
1704                 fetch_symref(symref, &symref, head_sha1);
1705         }
1706
1707         /* Run extra sanity checks if delete is not forced */
1708         if (!force) {
1709                 /* Remote HEAD must resolve to a known object */
1710                 if (symref)
1711                         return error("Remote HEAD symrefs too deep");
1712                 if (is_null_sha1(head_sha1))
1713                         return error("Unable to resolve remote HEAD");
1714                 if (!has_sha1_file(head_sha1))
1715                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1716
1717                 /* Remote branch must resolve to a known object */
1718                 if (is_null_sha1(remote_ref->old_sha1))
1719                         return error("Unable to resolve remote branch %s",
1720                                      remote_ref->name);
1721                 if (!has_sha1_file(remote_ref->old_sha1))
1722                         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));
1723
1724                 /* Remote branch must be an ancestor of remote HEAD */
1725                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
1726                         return error("The branch '%s' is not an ancestor "
1727                                      "of your current HEAD.\n"
1728                                      "If you are sure you want to delete it,"
1729                                      " run:\n\t'git http-push -D %s %s'",
1730                                      remote_ref->name, repo->url, pattern);
1731                 }
1732         }
1733
1734         /* Send delete request */
1735         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1736         if (dry_run)
1737                 return 0;
1738         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1739         sprintf(url, "%s%s", repo->url, remote_ref->name);
1740         slot = get_active_slot();
1741         slot->results = &results;
1742         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1743         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1744         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1745         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
1746         if (start_active_slot(slot)) {
1747                 run_active_slot(slot);
1748                 free(url);
1749                 if (results.curl_result != CURLE_OK)
1750                         return error("DELETE request failed (%d/%ld)\n",
1751                                      results.curl_result, results.http_code);
1752         } else {
1753                 free(url);
1754                 return error("Unable to start DELETE request");
1755         }
1756
1757         return 0;
1758 }
1759
1760 static void run_request_queue(void)
1761 {
1762 #ifdef USE_CURL_MULTI
1763         is_running_queue = 1;
1764         fill_active_slots();
1765         add_fill_function(NULL, fill_active_slot);
1766 #endif
1767         do {
1768                 finish_all_active_slots();
1769 #ifdef USE_CURL_MULTI
1770                 fill_active_slots();
1771 #endif
1772         } while (request_queue_head && !aborted);
1773
1774 #ifdef USE_CURL_MULTI
1775         is_running_queue = 0;
1776 #endif
1777 }
1778
1779 int main(int argc, char **argv)
1780 {
1781         struct transfer_request *request;
1782         struct transfer_request *next_request;
1783         int nr_refspec = 0;
1784         char **refspec = NULL;
1785         struct remote_lock *ref_lock = NULL;
1786         struct remote_lock *info_ref_lock = NULL;
1787         struct rev_info revs;
1788         int delete_branch = 0;
1789         int force_delete = 0;
1790         int objects_to_send;
1791         int rc = 0;
1792         int i;
1793         int new_refs;
1794         struct ref *ref, *local_refs;
1795         struct remote *remote;
1796         char *rewritten_url = NULL;
1797
1798         git_extract_argv0_path(argv[0]);
1799
1800         repo = xcalloc(sizeof(*repo), 1);
1801
1802         argv++;
1803         for (i = 1; i < argc; i++, argv++) {
1804                 char *arg = *argv;
1805
1806                 if (*arg == '-') {
1807                         if (!strcmp(arg, "--all")) {
1808                                 push_all = MATCH_REFS_ALL;
1809                                 continue;
1810                         }
1811                         if (!strcmp(arg, "--force")) {
1812                                 force_all = 1;
1813                                 continue;
1814                         }
1815                         if (!strcmp(arg, "--dry-run")) {
1816                                 dry_run = 1;
1817                                 continue;
1818                         }
1819                         if (!strcmp(arg, "--helper-status")) {
1820                                 helper_status = 1;
1821                                 continue;
1822                         }
1823                         if (!strcmp(arg, "--verbose")) {
1824                                 push_verbosely = 1;
1825                                 http_is_verbose = 1;
1826                                 continue;
1827                         }
1828                         if (!strcmp(arg, "-d")) {
1829                                 delete_branch = 1;
1830                                 continue;
1831                         }
1832                         if (!strcmp(arg, "-D")) {
1833                                 delete_branch = 1;
1834                                 force_delete = 1;
1835                                 continue;
1836                         }
1837                         if (!strcmp(arg, "-h"))
1838                                 usage(http_push_usage);
1839                 }
1840                 if (!repo->url) {
1841                         char *path = strstr(arg, "//");
1842                         repo->url = arg;
1843                         repo->path_len = strlen(arg);
1844                         if (path) {
1845                                 repo->path = strchr(path+2, '/');
1846                                 if (repo->path)
1847                                         repo->path_len = strlen(repo->path);
1848                         }
1849                         continue;
1850                 }
1851                 refspec = argv;
1852                 nr_refspec = argc - i;
1853                 break;
1854         }
1855
1856 #ifndef USE_CURL_MULTI
1857         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1858 #endif
1859
1860         if (!repo->url)
1861                 usage(http_push_usage);
1862
1863         if (delete_branch && nr_refspec != 1)
1864                 die("You must specify only one branch name when deleting a remote branch");
1865
1866         setup_git_directory();
1867
1868         memset(remote_dir_exists, -1, 256);
1869
1870         /*
1871          * Create a minimum remote by hand to give to http_init(),
1872          * primarily to allow it to look at the URL.
1873          */
1874         remote = xcalloc(sizeof(*remote), 1);
1875         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
1876         remote->url[remote->url_nr++] = repo->url;
1877         http_init(remote);
1878
1879         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
1880                 rewritten_url = xmalloc(strlen(repo->url)+2);
1881                 strcpy(rewritten_url, repo->url);
1882                 strcat(rewritten_url, "/");
1883                 repo->path = rewritten_url + (repo->path - repo->url);
1884                 repo->path_len++;
1885                 repo->url = rewritten_url;
1886         }
1887
1888 #ifdef USE_CURL_MULTI
1889         is_running_queue = 0;
1890 #endif
1891
1892         /* Verify DAV compliance/lock support */
1893         if (!locking_available()) {
1894                 rc = 1;
1895                 goto cleanup;
1896         }
1897
1898         sigchain_push_common(remove_locks_on_signal);
1899
1900         /* Check whether the remote has server info files */
1901         repo->can_update_info_refs = 0;
1902         repo->has_info_refs = remote_exists("info/refs");
1903         repo->has_info_packs = remote_exists("objects/info/packs");
1904         if (repo->has_info_refs) {
1905                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1906                 if (info_ref_lock)
1907                         repo->can_update_info_refs = 1;
1908                 else {
1909                         error("cannot lock existing info/refs");
1910                         rc = 1;
1911                         goto cleanup;
1912                 }
1913         }
1914         if (repo->has_info_packs)
1915                 fetch_indices();
1916
1917         /* Get a list of all local and remote heads to validate refspecs */
1918         local_refs = get_local_heads();
1919         fprintf(stderr, "Fetching remote heads...\n");
1920         get_dav_remote_heads();
1921         run_request_queue();
1922
1923         /* Remove a remote branch if -d or -D was specified */
1924         if (delete_branch) {
1925                 if (delete_remote_branch(refspec[0], force_delete) == -1) {
1926                         fprintf(stderr, "Unable to delete remote branch %s\n",
1927                                 refspec[0]);
1928                         if (helper_status)
1929                                 printf("error %s cannot remove\n", refspec[0]);
1930                 }
1931                 goto cleanup;
1932         }
1933
1934         /* match them up */
1935         if (match_refs(local_refs, &remote_refs,
1936                        nr_refspec, (const char **) refspec, push_all)) {
1937                 rc = -1;
1938                 goto cleanup;
1939         }
1940         if (!remote_refs) {
1941                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1942                 if (helper_status)
1943                         printf("error null no match\n");
1944                 rc = 0;
1945                 goto cleanup;
1946         }
1947
1948         new_refs = 0;
1949         for (ref = remote_refs; ref; ref = ref->next) {
1950                 char old_hex[60], *new_hex;
1951                 const char *commit_argv[5];
1952                 int commit_argc;
1953                 char *new_sha1_hex, *old_sha1_hex;
1954
1955                 if (!ref->peer_ref)
1956                         continue;
1957
1958                 if (is_null_sha1(ref->peer_ref->new_sha1)) {
1959                         if (delete_remote_branch(ref->name, 1) == -1) {
1960                                 error("Could not remove %s", ref->name);
1961                                 if (helper_status)
1962                                         printf("error %s cannot remove\n", ref->name);
1963                                 rc = -4;
1964                         }
1965                         else if (helper_status)
1966                                 printf("ok %s\n", ref->name);
1967                         new_refs++;
1968                         continue;
1969                 }
1970
1971                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1972                         if (push_verbosely)
1973                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
1974                         if (helper_status)
1975                                 printf("ok %s up to date\n", ref->name);
1976                         continue;
1977                 }
1978
1979                 if (!force_all &&
1980                     !is_null_sha1(ref->old_sha1) &&
1981                     !ref->force) {
1982                         if (!has_sha1_file(ref->old_sha1) ||
1983                             !ref_newer(ref->peer_ref->new_sha1,
1984                                        ref->old_sha1)) {
1985                                 /*
1986                                  * We do not have the remote ref, or
1987                                  * we know that the remote ref is not
1988                                  * an ancestor of what we are trying to
1989                                  * push.  Either way this can be losing
1990                                  * commits at the remote end and likely
1991                                  * we were not up to date to begin with.
1992                                  */
1993                                 error("remote '%s' is not an ancestor of\n"
1994                                       "local '%s'.\n"
1995                                       "Maybe you are not up-to-date and "
1996                                       "need to pull first?",
1997                                       ref->name,
1998                                       ref->peer_ref->name);
1999                                 if (helper_status)
2000                                         printf("error %s non-fast forward\n", ref->name);
2001                                 rc = -2;
2002                                 continue;
2003                         }
2004                 }
2005                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2006                 new_refs++;
2007                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2008                 new_hex = sha1_to_hex(ref->new_sha1);
2009
2010                 fprintf(stderr, "updating '%s'", ref->name);
2011                 if (strcmp(ref->name, ref->peer_ref->name))
2012                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2013                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2014                 if (dry_run) {
2015                         if (helper_status)
2016                                 printf("ok %s\n", ref->name);
2017                         continue;
2018                 }
2019
2020                 /* Lock remote branch ref */
2021                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2022                 if (ref_lock == NULL) {
2023                         fprintf(stderr, "Unable to lock remote branch %s\n",
2024                                 ref->name);
2025                         if (helper_status)
2026                                 printf("error %s lock error\n", ref->name);
2027                         rc = 1;
2028                         continue;
2029                 }
2030
2031                 /* Set up revision info for this refspec */
2032                 commit_argc = 3;
2033                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2034                 old_sha1_hex = NULL;
2035                 commit_argv[1] = "--objects";
2036                 commit_argv[2] = new_sha1_hex;
2037                 if (!push_all && !is_null_sha1(ref->old_sha1)) {
2038                         old_sha1_hex = xmalloc(42);
2039                         sprintf(old_sha1_hex, "^%s",
2040                                 sha1_to_hex(ref->old_sha1));
2041                         commit_argv[3] = old_sha1_hex;
2042                         commit_argc++;
2043                 }
2044                 commit_argv[commit_argc] = NULL;
2045                 init_revisions(&revs, setup_git_directory());
2046                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2047                 revs.edge_hint = 0; /* just in case */
2048                 free(new_sha1_hex);
2049                 if (old_sha1_hex) {
2050                         free(old_sha1_hex);
2051                         commit_argv[1] = NULL;
2052                 }
2053
2054                 /* Generate a list of objects that need to be pushed */
2055                 pushing = 0;
2056                 if (prepare_revision_walk(&revs))
2057                         die("revision walk setup failed");
2058                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2059                 objects_to_send = get_delta(&revs, ref_lock);
2060                 finish_all_active_slots();
2061
2062                 /* Push missing objects to remote, this would be a
2063                    convenient time to pack them first if appropriate. */
2064                 pushing = 1;
2065                 if (objects_to_send)
2066                         fprintf(stderr, "    sending %d objects\n",
2067                                 objects_to_send);
2068
2069                 run_request_queue();
2070
2071                 /* Update the remote branch if all went well */
2072                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2073                         rc = 1;
2074
2075                 if (!rc)
2076                         fprintf(stderr, "    done\n");
2077                 if (helper_status)
2078                         printf("%s %s\n", !rc ? "ok" : "error", ref->name);
2079                 unlock_remote(ref_lock);
2080                 check_locks();
2081         }
2082
2083         /* Update remote server info if appropriate */
2084         if (repo->has_info_refs && new_refs) {
2085                 if (info_ref_lock && repo->can_update_info_refs) {
2086                         fprintf(stderr, "Updating remote server info\n");
2087                         if (!dry_run)
2088                                 update_remote_info_refs(info_ref_lock);
2089                 } else {
2090                         fprintf(stderr, "Unable to update server info\n");
2091                 }
2092         }
2093
2094  cleanup:
2095         free(rewritten_url);
2096         if (info_ref_lock)
2097                 unlock_remote(info_ref_lock);
2098         free(repo);
2099
2100         http_cleanup();
2101
2102         request = request_queue_head;
2103         while (request != NULL) {
2104                 next_request = request->next;
2105                 release_request(request);
2106                 request = next_request;
2107         }
2108
2109         return rc;
2110 }