Andrew's git - gitweb.git/blob

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