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