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