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