Andrew's git / gitweb.git / http-push.c
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http-push.con commit http*: add helper methods for fetching objects (loose) (5424bc5)
   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                }
 197                s++;
 198        }
 199        return strbuf_detach(&buf, NULL);
 200}
 201
 202static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 203{
 204        struct strbuf buf = STRBUF_INIT;
 205        struct curl_slist *dav_headers = NULL;
 206
 207        if (options & DAV_HEADER_IF) {
 208                strbuf_addf(&buf, "If: (<%s>)", lock->token);
 209                dav_headers = curl_slist_append(dav_headers, buf.buf);
 210                strbuf_reset(&buf);
 211        }
 212        if (options & DAV_HEADER_LOCK) {
 213                strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 214                dav_headers = curl_slist_append(dav_headers, buf.buf);
 215                strbuf_reset(&buf);
 216        }
 217        if (options & DAV_HEADER_TIMEOUT) {
 218                strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 219                dav_headers = curl_slist_append(dav_headers, buf.buf);
 220                strbuf_reset(&buf);
 221        }
 222        strbuf_release(&buf);
 223
 224        return dav_headers;
 225}
 226
 227static void finish_request(struct transfer_request *request);
 228static void release_request(struct transfer_request *request);
 229
 230static void process_response(void *callback_data)
 231{
 232        struct transfer_request *request =
 233                (struct transfer_request *)callback_data;
 234
 235        finish_request(request);
 236}
 237
 238#ifdef USE_CURL_MULTI
 239
 240static void start_fetch_loose(struct transfer_request *request)
 241{
 242        struct active_request_slot *slot;
 243        struct http_object_request *obj_req;
 244
 245        obj_req = new_http_object_request(repo->url, request->obj->sha1);
 246        if (obj_req == NULL) {
 247                request->state = ABORTED;
 248                return;
 249        }
 250
 251        slot = obj_req->slot;
 252        slot->callback_func = process_response;
 253        slot->callback_data = request;
 254        request->slot = slot;
 255        request->userData = obj_req;
 256
 257        /* Try to get the request started, abort the request on error */
 258        request->state = RUN_FETCH_LOOSE;
 259        if (!start_active_slot(slot)) {
 260                fprintf(stderr, "Unable to start GET request\n");
 261                repo->can_update_info_refs = 0;
 262                release_http_object_request(obj_req);
 263                release_request(request);
 264        }
 265}
 266
 267static void start_mkcol(struct transfer_request *request)
 268{
 269        char *hex = sha1_to_hex(request->obj->sha1);
 270        struct active_request_slot *slot;
 271
 272        request->url = get_remote_object_url(repo->url, hex, 1);
 273
 274        slot = get_active_slot();
 275        slot->callback_func = process_response;
 276        slot->callback_data = request;
 277        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 278        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 279        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 280        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 281        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 282
 283        if (start_active_slot(slot)) {
 284                request->slot = slot;
 285                request->state = RUN_MKCOL;
 286        } else {
 287                request->state = ABORTED;
 288                free(request->url);
 289                request->url = NULL;
 290        }
 291}
 292#endif
 293
 294static void start_fetch_packed(struct transfer_request *request)
 295{
 296        struct packed_git *target;
 297
 298        struct transfer_request *check_request = request_queue_head;
 299        struct http_pack_request *preq;
 300
 301        target = find_sha1_pack(request->obj->sha1, repo->packs);
 302        if (!target) {
 303                fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 304                repo->can_update_info_refs = 0;
 305                release_request(request);
 306                return;
 307        }
 308
 309        fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 310        fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 311
 312        preq = new_http_pack_request(target, repo->url);
 313        if (preq == NULL) {
 314                release_http_pack_request(preq);
 315                repo->can_update_info_refs = 0;
 316                return;
 317        }
 318        preq->lst = &repo->packs;
 319
 320        /* Make sure there isn't another open request for this pack */
 321        while (check_request) {
 322                if (check_request->state == RUN_FETCH_PACKED &&
 323                    !strcmp(check_request->url, preq->url)) {
 324                        release_http_pack_request(preq);
 325                        release_request(request);
 326                        return;
 327                }
 328                check_request = check_request->next;
 329        }
 330
 331        preq->slot->callback_func = process_response;
 332        preq->slot->callback_data = request;
 333        request->slot = preq->slot;
 334        request->userData = preq;
 335
 336        /* Try to get the request started, abort the request on error */
 337        request->state = RUN_FETCH_PACKED;
 338        if (!start_active_slot(preq->slot)) {
 339                fprintf(stderr, "Unable to start GET request\n");
 340                release_http_pack_request(preq);
 341                repo->can_update_info_refs = 0;
 342                release_request(request);
 343        }
 344}
 345
 346static void start_put(struct transfer_request *request)
 347{
 348        char *hex = sha1_to_hex(request->obj->sha1);
 349        struct active_request_slot *slot;
 350        struct strbuf buf = STRBUF_INIT;
 351        enum object_type type;
 352        char hdr[50];
 353        void *unpacked;
 354        unsigned long len;
 355        int hdrlen;
 356        ssize_t size;
 357        z_stream stream;
 358
 359        unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 360        hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 361
 362        /* Set it up */
 363        memset(&stream, 0, sizeof(stream));
 364        deflateInit(&stream, zlib_compression_level);
 365        size = deflateBound(&stream, len + hdrlen);
 366        strbuf_init(&request->buffer.buf, size);
 367        request->buffer.posn = 0;
 368
 369        /* Compress it */
 370        stream.next_out = (unsigned char *)request->buffer.buf.buf;
 371        stream.avail_out = size;
 372
 373        /* First header.. */
 374        stream.next_in = (void *)hdr;
 375        stream.avail_in = hdrlen;
 376        while (deflate(&stream, 0) == Z_OK)
 377                /* nothing */;
 378
 379        /* Then the data itself.. */
 380        stream.next_in = unpacked;
 381        stream.avail_in = len;
 382        while (deflate(&stream, Z_FINISH) == Z_OK)
 383                /* nothing */;
 384        deflateEnd(&stream);
 385        free(unpacked);
 386
 387        request->buffer.buf.len = stream.total_out;
 388
 389        strbuf_addstr(&buf, "Destination: ");
 390        append_remote_object_url(&buf, repo->url, hex, 0);
 391        request->dest = strbuf_detach(&buf, NULL);
 392
 393        append_remote_object_url(&buf, repo->url, hex, 0);
 394        strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 395        request->url = strbuf_detach(&buf, NULL);
 396
 397        slot = get_active_slot();
 398        slot->callback_func = process_response;
 399        slot->callback_data = request;
 400        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 401        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 402        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 403#ifndef NO_CURL_IOCTL
 404        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 405        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 406#endif
 407        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 408        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 409        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 410        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 411        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 412        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 413
 414        if (start_active_slot(slot)) {
 415                request->slot = slot;
 416                request->state = RUN_PUT;
 417        } else {
 418                request->state = ABORTED;
 419                free(request->url);
 420                request->url = NULL;
 421        }
 422}
 423
 424static void start_move(struct transfer_request *request)
 425{
 426        struct active_request_slot *slot;
 427        struct curl_slist *dav_headers = NULL;
 428
 429        slot = get_active_slot();
 430        slot->callback_func = process_response;
 431        slot->callback_data = request;
 432        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 433        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 434        dav_headers = curl_slist_append(dav_headers, request->dest);
 435        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 436        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 437        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 438        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 439
 440        if (start_active_slot(slot)) {
 441                request->slot = slot;
 442                request->state = RUN_MOVE;
 443        } else {
 444                request->state = ABORTED;
 445                free(request->url);
 446                request->url = NULL;
 447        }
 448}
 449
 450static int refresh_lock(struct remote_lock *lock)
 451{
 452        struct active_request_slot *slot;
 453        struct slot_results results;
 454        struct curl_slist *dav_headers;
 455        int rc = 0;
 456
 457        lock->refreshing = 1;
 458
 459        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 460
 461        slot = get_active_slot();
 462        slot->results = &results;
 463        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 464        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 465        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 466        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 467        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 468
 469        if (start_active_slot(slot)) {
 470                run_active_slot(slot);
 471                if (results.curl_result != CURLE_OK) {
 472                        fprintf(stderr, "LOCK HTTP error %ld\n",
 473                                results.http_code);
 474                } else {
 475                        lock->start_time = time(NULL);
 476                        rc = 1;
 477                }
 478        }
 479
 480        lock->refreshing = 0;
 481        curl_slist_free_all(dav_headers);
 482
 483        return rc;
 484}
 485
 486static void check_locks(void)
 487{
 488        struct remote_lock *lock = repo->locks;
 489        time_t current_time = time(NULL);
 490        int time_remaining;
 491
 492        while (lock) {
 493                time_remaining = lock->start_time + lock->timeout -
 494                        current_time;
 495                if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 496                        if (!refresh_lock(lock)) {
 497                                fprintf(stderr,
 498                                        "Unable to refresh lock for %s\n",
 499                                        lock->url);
 500                                aborted = 1;
 501                                return;
 502                        }
 503                }
 504                lock = lock->next;
 505        }
 506}
 507
 508static void release_request(struct transfer_request *request)
 509{
 510        struct transfer_request *entry = request_queue_head;
 511
 512        if (request == request_queue_head) {
 513                request_queue_head = request->next;
 514        } else {
 515                while (entry->next != NULL && entry->next != request)
 516                        entry = entry->next;
 517                if (entry->next == request)
 518                        entry->next = entry->next->next;
 519        }
 520
 521        free(request->url);
 522        free(request);
 523}
 524
 525static void finish_request(struct transfer_request *request)
 526{
 527        struct http_pack_request *preq;
 528        struct http_object_request *obj_req;
 529
 530        request->curl_result = request->slot->curl_result;
 531        request->http_code = request->slot->http_code;
 532        request->slot = NULL;
 533
 534        /* Keep locks active */
 535        check_locks();
 536
 537        if (request->headers != NULL)
 538                curl_slist_free_all(request->headers);
 539
 540        /* URL is reused for MOVE after PUT */
 541        if (request->state != RUN_PUT) {
 542                free(request->url);
 543                request->url = NULL;
 544        }
 545
 546        if (request->state == RUN_MKCOL) {
 547                if (request->curl_result == CURLE_OK ||
 548                    request->http_code == 405) {
 549                        remote_dir_exists[request->obj->sha1[0]] = 1;
 550                        start_put(request);
 551                } else {
 552                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 553                                sha1_to_hex(request->obj->sha1),
 554                                request->curl_result, request->http_code);
 555                        request->state = ABORTED;
 556                        aborted = 1;
 557                }
 558        } else if (request->state == RUN_PUT) {
 559                if (request->curl_result == CURLE_OK) {
 560                        start_move(request);
 561                } else {
 562                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 563                                sha1_to_hex(request->obj->sha1),
 564                                request->curl_result, request->http_code);
 565                        request->state = ABORTED;
 566                        aborted = 1;
 567                }
 568        } else if (request->state == RUN_MOVE) {
 569                if (request->curl_result == CURLE_OK) {
 570                        if (push_verbosely)
 571                                fprintf(stderr, "    sent %s\n",
 572                                        sha1_to_hex(request->obj->sha1));
 573                        request->obj->flags |= REMOTE;
 574                        release_request(request);
 575                } else {
 576                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 577                                sha1_to_hex(request->obj->sha1),
 578                                request->curl_result, request->http_code);
 579                        request->state = ABORTED;
 580                        aborted = 1;
 581                }
 582        } else if (request->state == RUN_FETCH_LOOSE) {
 583                obj_req = (struct http_object_request *)request->userData;
 584
 585                if (finish_http_object_request(obj_req) == 0)
 586                        if (obj_req->rename == 0)
 587                                request->obj->flags |= (LOCAL | REMOTE);
 588
 589                /* Try fetching packed if necessary */
 590                if (request->obj->flags & LOCAL) {
 591                        release_http_object_request(obj_req);
 592                        release_request(request);
 593                } else
 594                        start_fetch_packed(request);
 595
 596        } else if (request->state == RUN_FETCH_PACKED) {
 597                int fail = 1;
 598                if (request->curl_result != CURLE_OK) {
 599                        fprintf(stderr, "Unable to get pack file %s\n%s",
 600                                request->url, curl_errorstr);
 601                } else {
 602                        preq = (struct http_pack_request *)request->userData;
 603
 604                        if (preq) {
 605                                if (finish_http_pack_request(preq) > 0)
 606                                        fail = 0;
 607                                release_http_pack_request(preq);
 608                        }
 609                }
 610                if (fail)
 611                        repo->can_update_info_refs = 0;
 612                release_request(request);
 613        }
 614}
 615
 616#ifdef USE_CURL_MULTI
 617static int is_running_queue;
 618static int fill_active_slot(void *unused)
 619{
 620        struct transfer_request *request;
 621
 622        if (aborted || !is_running_queue)
 623                return 0;
 624
 625        for (request = request_queue_head; request; request = request->next) {
 626                if (request->state == NEED_FETCH) {
 627                        start_fetch_loose(request);
 628                        return 1;
 629                } else if (pushing && request->state == NEED_PUSH) {
 630                        if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 631                                start_put(request);
 632                        } else {
 633                                start_mkcol(request);
 634                        }
 635                        return 1;
 636                }
 637        }
 638        return 0;
 639}
 640#endif
 641
 642static void get_remote_object_list(unsigned char parent);
 643
 644static void add_fetch_request(struct object *obj)
 645{
 646        struct transfer_request *request;
 647
 648        check_locks();
 649
 650        /*
 651         * Don't fetch the object if it's known to exist locally
 652         * or is already in the request queue
 653         */
 654        if (remote_dir_exists[obj->sha1[0]] == -1)
 655                get_remote_object_list(obj->sha1[0]);
 656        if (obj->flags & (LOCAL | FETCHING))
 657                return;
 658
 659        obj->flags |= FETCHING;
 660        request = xmalloc(sizeof(*request));
 661        request->obj = obj;
 662        request->url = NULL;
 663        request->lock = NULL;
 664        request->headers = NULL;
 665        request->state = NEED_FETCH;
 666        request->next = request_queue_head;
 667        request_queue_head = request;
 668
 669#ifdef USE_CURL_MULTI
 670        fill_active_slots();
 671        step_active_slots();
 672#endif
 673}
 674
 675static int add_send_request(struct object *obj, struct remote_lock *lock)
 676{
 677        struct transfer_request *request = request_queue_head;
 678        struct packed_git *target;
 679
 680        /* Keep locks active */
 681        check_locks();
 682
 683        /*
 684         * Don't push the object if it's known to exist on the remote
 685         * or is already in the request queue
 686         */
 687        if (remote_dir_exists[obj->sha1[0]] == -1)
 688                get_remote_object_list(obj->sha1[0]);
 689        if (obj->flags & (REMOTE | PUSHING))
 690                return 0;
 691        target = find_sha1_pack(obj->sha1, repo->packs);
 692        if (target) {
 693                obj->flags |= REMOTE;
 694                return 0;
 695        }
 696
 697        obj->flags |= PUSHING;
 698        request = xmalloc(sizeof(*request));
 699        request->obj = obj;
 700        request->url = NULL;
 701        request->lock = lock;
 702        request->headers = NULL;
 703        request->state = NEED_PUSH;
 704        request->next = request_queue_head;
 705        request_queue_head = request;
 706
 707#ifdef USE_CURL_MULTI
 708        fill_active_slots();
 709        step_active_slots();
 710#endif
 711
 712        return 1;
 713}
 714
 715static int fetch_indices(void)
 716{
 717        int ret;
 718
 719        if (push_verbosely)
 720                fprintf(stderr, "Getting pack list\n");
 721
 722        switch (http_get_info_packs(repo->url, &repo->packs)) {
 723        case HTTP_OK:
 724        case HTTP_MISSING_TARGET:
 725                ret = 0;
 726                break;
 727        default:
 728                ret = -1;
 729        }
 730
 731        return ret;
 732}
 733
 734static void one_remote_object(const char *hex)
 735{
 736        unsigned char sha1[20];
 737        struct object *obj;
 738
 739        if (get_sha1_hex(hex, sha1) != 0)
 740                return;
 741
 742        obj = lookup_object(sha1);
 743        if (!obj)
 744                obj = parse_object(sha1);
 745
 746        /* Ignore remote objects that don't exist locally */
 747        if (!obj)
 748                return;
 749
 750        obj->flags |= REMOTE;
 751        if (!object_list_contains(objects, obj))
 752                object_list_insert(obj, &objects);
 753}
 754
 755static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 756{
 757        int *lock_flags = (int *)ctx->userData;
 758
 759        if (tag_closed) {
 760                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 761                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
 762                            (*lock_flags & DAV_PROP_LOCKWR)) {
 763                                *lock_flags |= DAV_LOCK_OK;
 764                        }
 765                        *lock_flags &= DAV_LOCK_OK;
 766                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 767                        *lock_flags |= DAV_PROP_LOCKWR;
 768                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 769                        *lock_flags |= DAV_PROP_LOCKEX;
 770                }
 771        }
 772}
 773
 774static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 775{
 776        struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 777        git_SHA_CTX sha_ctx;
 778        unsigned char lock_token_sha1[20];
 779
 780        if (tag_closed && ctx->cdata) {
 781                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 782                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 783                        strcpy(lock->owner, ctx->cdata);
 784                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 785                        if (!prefixcmp(ctx->cdata, "Second-"))
 786                                lock->timeout =
 787                                        strtol(ctx->cdata + 7, NULL, 10);
 788                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 789                        lock->token = xmalloc(strlen(ctx->cdata) + 1);
 790                        strcpy(lock->token, ctx->cdata);
 791
 792                        git_SHA1_Init(&sha_ctx);
 793                        git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 794                        git_SHA1_Final(lock_token_sha1, &sha_ctx);
 795
 796                        lock->tmpfile_suffix[0] = '_';
 797                        memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 798                }
 799        }
 800}
 801
 802static void one_remote_ref(char *refname);
 803
 804static void
 805xml_start_tag(void *userData, const char *name, const char **atts)
 806{
 807        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 808        const char *c = strchr(name, ':');
 809        int new_len;
 810
 811        if (c == NULL)
 812                c = name;
 813        else
 814                c++;
 815
 816        new_len = strlen(ctx->name) + strlen(c) + 2;
 817
 818        if (new_len > ctx->len) {
 819                ctx->name = xrealloc(ctx->name, new_len);
 820                ctx->len = new_len;
 821        }
 822        strcat(ctx->name, ".");
 823        strcat(ctx->name, c);
 824
 825        free(ctx->cdata);
 826        ctx->cdata = NULL;
 827
 828        ctx->userFunc(ctx, 0);
 829}
 830
 831static void
 832xml_end_tag(void *userData, const char *name)
 833{
 834        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 835        const char *c = strchr(name, ':');
 836        char *ep;
 837
 838        ctx->userFunc(ctx, 1);
 839
 840        if (c == NULL)
 841                c = name;
 842        else
 843                c++;
 844
 845        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 846        *ep = 0;
 847}
 848
 849static void
 850xml_cdata(void *userData, const XML_Char *s, int len)
 851{
 852        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 853        free(ctx->cdata);
 854        ctx->cdata = xmemdupz(s, len);
 855}
 856
 857static struct remote_lock *lock_remote(const char *path, long timeout)
 858{
 859        struct active_request_slot *slot;
 860        struct slot_results results;
 861        struct buffer out_buffer = { STRBUF_INIT, 0 };
 862        struct strbuf in_buffer = STRBUF_INIT;
 863        char *url;
 864        char *ep;
 865        char timeout_header[25];
 866        struct remote_lock *lock = NULL;
 867        struct curl_slist *dav_headers = NULL;
 868        struct xml_ctx ctx;
 869        char *escaped;
 870
 871        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
 872        sprintf(url, "%s%s", repo->url, path);
 873
 874        /* Make sure leading directories exist for the remote ref */
 875        ep = strchr(url + strlen(repo->url) + 1, '/');
 876        while (ep) {
 877                char saved_character = ep[1];
 878                ep[1] = '\0';
 879                slot = get_active_slot();
 880                slot->results = &results;
 881                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 882                curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 883                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 884                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 885                if (start_active_slot(slot)) {
 886                        run_active_slot(slot);
 887                        if (results.curl_result != CURLE_OK &&
 888                            results.http_code != 405) {
 889                                fprintf(stderr,
 890                                        "Unable to create branch path %s\n",
 891                                        url);
 892                                free(url);
 893                                return NULL;
 894                        }
 895                } else {
 896                        fprintf(stderr, "Unable to start MKCOL request\n");
 897                        free(url);
 898                        return NULL;
 899                }
 900                ep[1] = saved_character;
 901                ep = strchr(ep + 1, '/');
 902        }
 903
 904        escaped = xml_entities(git_default_email);
 905        strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
 906        free(escaped);
 907
 908        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
 909        dav_headers = curl_slist_append(dav_headers, timeout_header);
 910        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 911
 912        slot = get_active_slot();
 913        slot->results = &results;
 914        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
 915        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
 916        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 917#ifndef NO_CURL_IOCTL
 918        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 919        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
 920#endif
 921        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 922        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 923        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 924        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 925        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 926        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 927
 928        lock = xcalloc(1, sizeof(*lock));
 929        lock->timeout = -1;
 930
 931        if (start_active_slot(slot)) {
 932                run_active_slot(slot);
 933                if (results.curl_result == CURLE_OK) {
 934                        XML_Parser parser = XML_ParserCreate(NULL);
 935                        enum XML_Status result;
 936                        ctx.name = xcalloc(10, 1);
 937                        ctx.len = 0;
 938                        ctx.cdata = NULL;
 939                        ctx.userFunc = handle_new_lock_ctx;
 940                        ctx.userData = lock;
 941                        XML_SetUserData(parser, &ctx);
 942                        XML_SetElementHandler(parser, xml_start_tag,
 943                                              xml_end_tag);
 944                        XML_SetCharacterDataHandler(parser, xml_cdata);
 945                        result = XML_Parse(parser, in_buffer.buf,
 946                                           in_buffer.len, 1);
 947                        free(ctx.name);
 948                        if (result != XML_STATUS_OK) {
 949                                fprintf(stderr, "XML error: %s\n",
 950                                        XML_ErrorString(
 951                                                XML_GetErrorCode(parser)));
 952                                lock->timeout = -1;
 953                        }
 954                        XML_ParserFree(parser);
 955                }
 956        } else {
 957                fprintf(stderr, "Unable to start LOCK request\n");
 958        }
 959
 960        curl_slist_free_all(dav_headers);
 961        strbuf_release(&out_buffer.buf);
 962        strbuf_release(&in_buffer);
 963
 964        if (lock->token == NULL || lock->timeout <= 0) {
 965                free(lock->token);
 966                free(lock->owner);
 967                free(url);
 968                free(lock);
 969                lock = NULL;
 970        } else {
 971                lock->url = url;
 972                lock->start_time = time(NULL);
 973                lock->next = repo->locks;
 974                repo->locks = lock;
 975        }
 976
 977        return lock;
 978}
 979
 980static int unlock_remote(struct remote_lock *lock)
 981{
 982        struct active_request_slot *slot;
 983        struct slot_results results;
 984        struct remote_lock *prev = repo->locks;
 985        struct curl_slist *dav_headers;
 986        int rc = 0;
 987
 988        dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
 989
 990        slot = get_active_slot();
 991        slot->results = &results;
 992        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 993        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 994        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
 995        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 996
 997        if (start_active_slot(slot)) {
 998                run_active_slot(slot);
 999                if (results.curl_result == CURLE_OK)
1000                        rc = 1;
1001                else
1002                        fprintf(stderr, "UNLOCK HTTP error %ld\n",
1003                                results.http_code);
1004        } else {
1005                fprintf(stderr, "Unable to start UNLOCK request\n");
1006        }
1007
1008        curl_slist_free_all(dav_headers);
1009
1010        if (repo->locks == lock) {
1011                repo->locks = lock->next;
1012        } else {
1013                while (prev && prev->next != lock)
1014                        prev = prev->next;
1015                if (prev)
1016                        prev->next = prev->next->next;
1017        }
1018
1019        free(lock->owner);
1020        free(lock->url);
1021        free(lock->token);
1022        free(lock);
1023
1024        return rc;
1025}
1026
1027static void remove_locks(void)
1028{
1029        struct remote_lock *lock = repo->locks;
1030
1031        fprintf(stderr, "Removing remote locks...\n");
1032        while (lock) {
1033                unlock_remote(lock);
1034                lock = lock->next;
1035        }
1036}
1037
1038static void remove_locks_on_signal(int signo)
1039{
1040        remove_locks();
1041        sigchain_pop(signo);
1042        raise(signo);
1043}
1044
1045static void remote_ls(const char *path, int flags,
1046                      void (*userFunc)(struct remote_ls_ctx *ls),
1047                      void *userData);
1048
1049static void process_ls_object(struct remote_ls_ctx *ls)
1050{
1051        unsigned int *parent = (unsigned int *)ls->userData;
1052        char *path = ls->dentry_name;
1053        char *obj_hex;
1054
1055        if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1056                remote_dir_exists[*parent] = 1;
1057                return;
1058        }
1059
1060        if (strlen(path) != 49)
1061                return;
1062        path += 8;
1063        obj_hex = xmalloc(strlen(path));
1064        /* NB: path is not null-terminated, can not use strlcpy here */
1065        memcpy(obj_hex, path, 2);
1066        strcpy(obj_hex + 2, path + 3);
1067        one_remote_object(obj_hex);
1068        free(obj_hex);
1069}
1070
1071static void process_ls_ref(struct remote_ls_ctx *ls)
1072{
1073        if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1074                fprintf(stderr, "  %s\n", ls->dentry_name);
1075                return;
1076        }
1077
1078        if (!(ls->dentry_flags & IS_DIR))
1079                one_remote_ref(ls->dentry_name);
1080}
1081
1082static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1083{
1084        struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1085
1086        if (tag_closed) {
1087                if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1088                        if (ls->dentry_flags & IS_DIR) {
1089                                if (ls->flags & PROCESS_DIRS) {
1090                                        ls->userFunc(ls);
1091                                }
1092                                if (strcmp(ls->dentry_name, ls->path) &&
1093                                    ls->flags & RECURSIVE) {
1094                                        remote_ls(ls->dentry_name,
1095                                                  ls->flags,
1096                                                  ls->userFunc,
1097                                                  ls->userData);
1098                                }
1099                        } else if (ls->flags & PROCESS_FILES) {
1100                                ls->userFunc(ls);
1101                        }
1102                } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1103                        char *path = ctx->cdata;
1104                        if (*ctx->cdata == 'h') {
1105                                path = strstr(path, "//");
1106                                if (path) {
1107                                        path = strchr(path+2, '/');
1108                                }
1109                        }
1110                        if (path) {
1111                                path += repo->path_len;
1112                                ls->dentry_name = xstrdup(path);
1113                        }
1114                } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1115                        ls->dentry_flags |= IS_DIR;
1116                }
1117        } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1118                free(ls->dentry_name);
1119                ls->dentry_name = NULL;
1120                ls->dentry_flags = 0;
1121        }
1122}
1123
1124/*
1125 * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1126 * should _only_ heed the information from that file, instead of trying to
1127 * determine the refs from the remote file system (badly: it does not even
1128 * know about packed-refs).
1129 */
1130static void remote_ls(const char *path, int flags,
1131                      void (*userFunc)(struct remote_ls_ctx *ls),
1132                      void *userData)
1133{
1134        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1135        struct active_request_slot *slot;
1136        struct slot_results results;
1137        struct strbuf in_buffer = STRBUF_INIT;
1138        struct buffer out_buffer = { STRBUF_INIT, 0 };
1139        struct curl_slist *dav_headers = NULL;
1140        struct xml_ctx ctx;
1141        struct remote_ls_ctx ls;
1142
1143        ls.flags = flags;
1144        ls.path = xstrdup(path);
1145        ls.dentry_name = NULL;
1146        ls.dentry_flags = 0;
1147        ls.userData = userData;
1148        ls.userFunc = userFunc;
1149
1150        sprintf(url, "%s%s", repo->url, path);
1151
1152        strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1153
1154        dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1155        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1156
1157        slot = get_active_slot();
1158        slot->results = &results;
1159        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1160        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1161        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1162#ifndef NO_CURL_IOCTL
1163        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1164        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1165#endif
1166        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1167        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1168        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1169        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1170        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1171        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1172
1173        if (start_active_slot(slot)) {
1174                run_active_slot(slot);
1175                if (results.curl_result == CURLE_OK) {
1176                        XML_Parser parser = XML_ParserCreate(NULL);
1177                        enum XML_Status result;
1178                        ctx.name = xcalloc(10, 1);
1179                        ctx.len = 0;
1180                        ctx.cdata = NULL;
1181                        ctx.userFunc = handle_remote_ls_ctx;
1182                        ctx.userData = &ls;
1183                        XML_SetUserData(parser, &ctx);
1184                        XML_SetElementHandler(parser, xml_start_tag,
1185                                              xml_end_tag);
1186                        XML_SetCharacterDataHandler(parser, xml_cdata);
1187                        result = XML_Parse(parser, in_buffer.buf,
1188                                           in_buffer.len, 1);
1189                        free(ctx.name);
1190
1191                        if (result != XML_STATUS_OK) {
1192                                fprintf(stderr, "XML error: %s\n",
1193                                        XML_ErrorString(
1194                                                XML_GetErrorCode(parser)));
1195                        }
1196                        XML_ParserFree(parser);
1197                }
1198        } else {
1199                fprintf(stderr, "Unable to start PROPFIND request\n");
1200        }
1201
1202        free(ls.path);
1203        free(url);
1204        strbuf_release(&out_buffer.buf);
1205        strbuf_release(&in_buffer);
1206        curl_slist_free_all(dav_headers);
1207}
1208
1209static void get_remote_object_list(unsigned char parent)
1210{
1211        char path[] = "objects/XX/";
1212        static const char hex[] = "0123456789abcdef";
1213        unsigned int val = parent;
1214
1215        path[8] = hex[val >> 4];
1216        path[9] = hex[val & 0xf];
1217        remote_dir_exists[val] = 0;
1218        remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1219                  process_ls_object, &val);
1220}
1221
1222static int locking_available(void)
1223{
1224        struct active_request_slot *slot;
1225        struct slot_results results;
1226        struct strbuf in_buffer = STRBUF_INIT;
1227        struct buffer out_buffer = { STRBUF_INIT, 0 };
1228        struct curl_slist *dav_headers = NULL;
1229        struct xml_ctx ctx;
1230        int lock_flags = 0;
1231        char *escaped;
1232
1233        escaped = xml_entities(repo->url);
1234        strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1235        free(escaped);
1236
1237        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1238        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1239
1240        slot = get_active_slot();
1241        slot->results = &results;
1242        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1243        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1244        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1245#ifndef NO_CURL_IOCTL
1246        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1247        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1248#endif
1249        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1250        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1251        curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1252        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1253        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1254        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1255
1256        if (start_active_slot(slot)) {
1257                run_active_slot(slot);
1258                if (results.curl_result == CURLE_OK) {
1259                        XML_Parser parser = XML_ParserCreate(NULL);
1260                        enum XML_Status result;
1261                        ctx.name = xcalloc(10, 1);
1262                        ctx.len = 0;
1263                        ctx.cdata = NULL;
1264                        ctx.userFunc = handle_lockprop_ctx;
1265                        ctx.userData = &lock_flags;
1266                        XML_SetUserData(parser, &ctx);
1267                        XML_SetElementHandler(parser, xml_start_tag,
1268                                              xml_end_tag);
1269                        result = XML_Parse(parser, in_buffer.buf,
1270                                           in_buffer.len, 1);
1271                        free(ctx.name);
1272
1273                        if (result != XML_STATUS_OK) {
1274                                fprintf(stderr, "XML error: %s\n",
1275                                        XML_ErrorString(
1276                                                XML_GetErrorCode(parser)));
1277                                lock_flags = 0;
1278                        }
1279                        XML_ParserFree(parser);
1280                        if (!lock_flags)
1281                                error("no DAV locking support on %s",
1282                                      repo->url);
1283
1284                } else {
1285                        error("Cannot access URL %s, return code %d",
1286                              repo->url, results.curl_result);
1287                        lock_flags = 0;
1288                }
1289        } else {
1290                error("Unable to start PROPFIND request on %s", repo->url);
1291        }
1292
1293        strbuf_release(&out_buffer.buf);
1294        strbuf_release(&in_buffer);
1295        curl_slist_free_all(dav_headers);
1296
1297        return lock_flags;
1298}
1299
1300static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1301{
1302        struct object_list *entry = xmalloc(sizeof(struct object_list));
1303        entry->item = obj;
1304        entry->next = *p;
1305        *p = entry;
1306        return &entry->next;
1307}
1308
1309static struct object_list **process_blob(struct blob *blob,
1310                                         struct object_list **p,
1311                                         struct name_path *path,
1312                                         const char *name)
1313{
1314        struct object *obj = &blob->object;
1315
1316        obj->flags |= LOCAL;
1317
1318        if (obj->flags & (UNINTERESTING | SEEN))
1319                return p;
1320
1321        obj->flags |= SEEN;
1322        return add_one_object(obj, p);
1323}
1324
1325static struct object_list **process_tree(struct tree *tree,
1326                                         struct object_list **p,
1327                                         struct name_path *path,
1328                                         const char *name)
1329{
1330        struct object *obj = &tree->object;
1331        struct tree_desc desc;
1332        struct name_entry entry;
1333        struct name_path me;
1334
1335        obj->flags |= LOCAL;
1336
1337        if (obj->flags & (UNINTERESTING | SEEN))
1338                return p;
1339        if (parse_tree(tree) < 0)
1340                die("bad tree object %s", sha1_to_hex(obj->sha1));
1341
1342        obj->flags |= SEEN;
1343        name = xstrdup(name);
1344        p = add_one_object(obj, p);
1345        me.up = path;
1346        me.elem = name;
1347        me.elem_len = strlen(name);
1348
1349        init_tree_desc(&desc, tree->buffer, tree->size);
1350
1351        while (tree_entry(&desc, &entry))
1352                switch (object_type(entry.mode)) {
1353                case OBJ_TREE:
1354                        p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1355                        break;
1356                case OBJ_BLOB:
1357                        p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1358                        break;
1359                default:
1360                        /* Subproject commit - not in this repository */
1361                        break;
1362                }
1363
1364        free(tree->buffer);
1365        tree->buffer = NULL;
1366        return p;
1367}
1368
1369static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1370{
1371        int i;
1372        struct commit *commit;
1373        struct object_list **p = &objects;
1374        int count = 0;
1375
1376        while ((commit = get_revision(revs)) != NULL) {
1377                p = process_tree(commit->tree, p, NULL, "");
1378                commit->object.flags |= LOCAL;
1379                if (!(commit->object.flags & UNINTERESTING))
1380                        count += add_send_request(&commit->object, lock);
1381        }
1382
1383        for (i = 0; i < revs->pending.nr; i++) {
1384                struct object_array_entry *entry = revs->pending.objects + i;
1385                struct object *obj = entry->item;
1386                const char *name = entry->name;
1387
1388                if (obj->flags & (UNINTERESTING | SEEN))
1389                        continue;
1390                if (obj->type == OBJ_TAG) {
1391                        obj->flags |= SEEN;
1392                        p = add_one_object(obj, p);
1393                        continue;
1394                }
1395                if (obj->type == OBJ_TREE) {
1396                        p = process_tree((struct tree *)obj, p, NULL, name);
1397                        continue;
1398                }
1399                if (obj->type == OBJ_BLOB) {
1400                        p = process_blob((struct blob *)obj, p, NULL, name);
1401                        continue;
1402                }
1403                die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1404        }
1405
1406        while (objects) {
1407                if (!(objects->item->flags & UNINTERESTING))
1408                        count += add_send_request(objects->item, lock);
1409                objects = objects->next;
1410        }
1411
1412        return count;
1413}
1414
1415static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1416{
1417        struct active_request_slot *slot;
1418        struct slot_results results;
1419        struct buffer out_buffer = { STRBUF_INIT, 0 };
1420        struct curl_slist *dav_headers;
1421
1422        dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1423
1424        strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1425
1426        slot = get_active_slot();
1427        slot->results = &results;
1428        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1429        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1430        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1431#ifndef NO_CURL_IOCTL
1432        curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1433        curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1434#endif
1435        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1436        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1437        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1438        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1439        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1440        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1441
1442        if (start_active_slot(slot)) {
1443                run_active_slot(slot);
1444                strbuf_release(&out_buffer.buf);
1445                if (results.curl_result != CURLE_OK) {
1446                        fprintf(stderr,
1447                                "PUT error: curl result=%d, HTTP code=%ld\n",
1448                                results.curl_result, results.http_code);
1449                        /* We should attempt recovery? */
1450                        return 0;
1451                }
1452        } else {
1453                strbuf_release(&out_buffer.buf);
1454                fprintf(stderr, "Unable to start PUT request\n");
1455                return 0;
1456        }
1457
1458        return 1;
1459}
1460
1461static struct ref *remote_refs, **remote_tail;
1462
1463static void one_remote_ref(char *refname)
1464{
1465        struct ref *ref;
1466        struct object *obj;
1467
1468        ref = alloc_ref(refname);
1469
1470        if (http_fetch_ref(repo->url, ref) != 0) {
1471                fprintf(stderr,
1472                        "Unable to fetch ref %s from %s\n",
1473                        refname, repo->url);
1474                free(ref);
1475                return;
1476        }
1477
1478        /*
1479         * Fetch a copy of the object if it doesn't exist locally - it
1480         * may be required for updating server info later.
1481         */
1482        if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1483                obj = lookup_unknown_object(ref->old_sha1);
1484                if (obj) {
1485                        fprintf(stderr, "  fetch %s for %s\n",
1486                                sha1_to_hex(ref->old_sha1), refname);
1487                        add_fetch_request(obj);
1488                }
1489        }
1490
1491        *remote_tail = ref;
1492        remote_tail = &ref->next;
1493}
1494
1495static void get_dav_remote_heads(void)
1496{
1497        remote_tail = &remote_refs;
1498        remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1499}
1500
1501static int is_zero_sha1(const unsigned char *sha1)
1502{
1503        int i;
1504
1505        for (i = 0; i < 20; i++) {
1506                if (*sha1++)
1507                        return 0;
1508        }
1509        return 1;
1510}
1511
1512static void add_remote_info_ref(struct remote_ls_ctx *ls)
1513{
1514        struct strbuf *buf = (struct strbuf *)ls->userData;
1515        struct object *o;
1516        int len;
1517        char *ref_info;
1518        struct ref *ref;
1519
1520        ref = alloc_ref(ls->dentry_name);
1521
1522        if (http_fetch_ref(repo->url, ref) != 0) {
1523                fprintf(stderr,
1524                        "Unable to fetch ref %s from %s\n",
1525                        ls->dentry_name, repo->url);
1526                aborted = 1;
1527                free(ref);
1528                return;
1529        }
1530
1531        o = parse_object(ref->old_sha1);
1532        if (!o) {
1533                fprintf(stderr,
1534                        "Unable to parse object %s for remote ref %s\n",
1535                        sha1_to_hex(ref->old_sha1), ls->dentry_name);
1536                aborted = 1;
1537                free(ref);
1538                return;
1539        }
1540
1541        len = strlen(ls->dentry_name) + 42;
1542        ref_info = xcalloc(len + 1, 1);
1543        sprintf(ref_info, "%s   %s\n",
1544                sha1_to_hex(ref->old_sha1), ls->dentry_name);
1545        fwrite_buffer(ref_info, 1, len, buf);
1546        free(ref_info);
1547
1548        if (o->type == OBJ_TAG) {
1549                o = deref_tag(o, ls->dentry_name, 0);
1550                if (o) {
1551                        len = strlen(ls->dentry_name) + 45;
1552                        ref_info = xcalloc(len + 1, 1);
1553                        sprintf(ref_info, "%s   %s^{}\n",
1554                                sha1_to_hex(o->sha1), ls->dentry_name);
1555                        fwrite_buffer(ref_info, 1, len, buf);
1556                        free(ref_info);
1557                }
1558        }
1559        free(ref);
1560}
1561
1562static void update_remote_info_refs(struct remote_lock *lock)
1563{
1564        struct buffer buffer = { STRBUF_INIT, 0 };
1565        struct active_request_slot *slot;
1566        struct slot_results results;
1567        struct curl_slist *dav_headers;
1568
1569        remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1570                  add_remote_info_ref, &buffer.buf);
1571        if (!aborted) {
1572                dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1573
1574                slot = get_active_slot();
1575                slot->results = &results;
1576                curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1577                curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1578                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1579#ifndef NO_CURL_IOCTL
1580                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1581                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1582#endif
1583                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1584                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1585                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1586                curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1587                curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1588                curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1589
1590                if (start_active_slot(slot)) {
1591                        run_active_slot(slot);
1592                        if (results.curl_result != CURLE_OK) {
1593                                fprintf(stderr,
1594                                        "PUT error: curl result=%d, HTTP code=%ld\n",
1595                                        results.curl_result, results.http_code);
1596                        }
1597                }
1598        }
1599        strbuf_release(&buffer.buf);
1600}
1601
1602static int remote_exists(const char *path)
1603{
1604        char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1605        int ret;
1606
1607        sprintf(url, "%s%s", repo->url, path);
1608
1609        switch (http_get_strbuf(url, NULL, 0)) {
1610        case HTTP_OK:
1611                ret = 1;
1612                break;
1613        case HTTP_MISSING_TARGET:
1614                ret = 0;
1615                break;
1616        case HTTP_ERROR:
1617                http_error(url, HTTP_ERROR);
1618        default:
1619                ret = -1;
1620        }
1621        free(url);
1622        return ret;
1623}
1624
1625static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1626{
1627        char *url;
1628        struct strbuf buffer = STRBUF_INIT;
1629
1630        url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1631        sprintf(url, "%s%s", repo->url, path);
1632
1633        if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1634                die("Couldn't get %s for remote symref\n%s", url,
1635                    curl_errorstr);
1636        free(url);
1637
1638        free(*symref);
1639        *symref = NULL;
1640        hashclr(sha1);
1641
1642        if (buffer.len == 0)
1643                return;
1644
1645        /* If it's a symref, set the refname; otherwise try for a sha1 */
1646        if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1647                *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1648        } else {
1649                get_sha1_hex(buffer.buf, sha1);
1650        }
1651
1652        strbuf_release(&buffer);
1653}
1654
1655static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
1656{
1657        struct commit *head = lookup_commit(head_sha1);
1658        struct commit *branch = lookup_commit(branch_sha1);
1659        struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
1660
1661        return (merge_bases && !merge_bases->next && merge_bases->item == branch);
1662}
1663
1664static int delete_remote_branch(char *pattern, int force)
1665{
1666        struct ref *refs = remote_refs;
1667        struct ref *remote_ref = NULL;
1668        unsigned char head_sha1[20];
1669        char *symref = NULL;
1670        int match;
1671        int patlen = strlen(pattern);
1672        int i;
1673        struct active_request_slot *slot;
1674        struct slot_results results;
1675        char *url;
1676
1677        /* Find the remote branch(es) matching the specified branch name */
1678        for (match = 0; refs; refs = refs->next) {
1679                char *name = refs->name;
1680                int namelen = strlen(name);
1681                if (namelen < patlen ||
1682                    memcmp(name + namelen - patlen, pattern, patlen))
1683                        continue;
1684                if (namelen != patlen && name[namelen - patlen - 1] != '/')
1685                        continue;
1686                match++;
1687                remote_ref = refs;
1688        }
1689        if (match == 0)
1690                return error("No remote branch matches %s", pattern);
1691        if (match != 1)
1692                return error("More than one remote branch matches %s",
1693                             pattern);
1694
1695        /*
1696         * Remote HEAD must be a symref (not exactly foolproof; a remote
1697         * symlink to a symref will look like a symref)
1698         */
1699        fetch_symref("HEAD", &symref, head_sha1);
1700        if (!symref)
1701                return error("Remote HEAD is not a symref");
1702
1703        /* Remote branch must not be the remote HEAD */
1704        for (i=0; symref && i<MAXDEPTH; i++) {
1705                if (!strcmp(remote_ref->name, symref))
1706                        return error("Remote branch %s is the current HEAD",
1707                                     remote_ref->name);
1708                fetch_symref(symref, &symref, head_sha1);
1709        }
1710
1711        /* Run extra sanity checks if delete is not forced */
1712        if (!force) {
1713                /* Remote HEAD must resolve to a known object */
1714                if (symref)
1715                        return error("Remote HEAD symrefs too deep");
1716                if (is_zero_sha1(head_sha1))
1717                        return error("Unable to resolve remote HEAD");
1718                if (!has_sha1_file(head_sha1))
1719                        return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1720
1721                /* Remote branch must resolve to a known object */
1722                if (is_zero_sha1(remote_ref->old_sha1))
1723                        return error("Unable to resolve remote branch %s",
1724                                     remote_ref->name);
1725                if (!has_sha1_file(remote_ref->old_sha1))
1726                        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));
1727
1728                /* Remote branch must be an ancestor of remote HEAD */
1729                if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
1730                        return error("The branch '%s' is not an ancestor "
1731                                     "of your current HEAD.\n"
1732                                     "If you are sure you want to delete it,"
1733                                     " run:\n\t'git http-push -D %s %s'",
1734                                     remote_ref->name, repo->url, pattern);
1735                }
1736        }
1737
1738        /* Send delete request */
1739        fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1740        if (dry_run)
1741                return 0;
1742        url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1743        sprintf(url, "%s%s", repo->url, remote_ref->name);
1744        slot = get_active_slot();
1745        slot->results = &results;
1746        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1747        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1748        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1749        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
1750        if (start_active_slot(slot)) {
1751                run_active_slot(slot);
1752                free(url);
1753                if (results.curl_result != CURLE_OK)
1754                        return error("DELETE request failed (%d/%ld)\n",
1755                                     results.curl_result, results.http_code);
1756        } else {
1757                free(url);
1758                return error("Unable to start DELETE request");
1759        }
1760
1761        return 0;
1762}
1763
1764void run_request_queue(void)
1765{
1766#ifdef USE_CURL_MULTI
1767        is_running_queue = 1;
1768        fill_active_slots();
1769        add_fill_function(NULL, fill_active_slot);
1770#endif
1771        do {
1772                finish_all_active_slots();
1773#ifdef USE_CURL_MULTI
1774                fill_active_slots();
1775#endif
1776        } while (request_queue_head && !aborted);
1777
1778#ifdef USE_CURL_MULTI
1779        is_running_queue = 0;
1780#endif
1781}
1782
1783int main(int argc, char **argv)
1784{
1785        struct transfer_request *request;
1786        struct transfer_request *next_request;
1787        int nr_refspec = 0;
1788        char **refspec = NULL;
1789        struct remote_lock *ref_lock = NULL;
1790        struct remote_lock *info_ref_lock = NULL;
1791        struct rev_info revs;
1792        int delete_branch = 0;
1793        int force_delete = 0;
1794        int objects_to_send;
1795        int rc = 0;
1796        int i;
1797        int new_refs;
1798        struct ref *ref, *local_refs;
1799        struct remote *remote;
1800        char *rewritten_url = NULL;
1801
1802        git_extract_argv0_path(argv[0]);
1803
1804        setup_git_directory();
1805
1806        repo = xcalloc(sizeof(*repo), 1);
1807
1808        argv++;
1809        for (i = 1; i < argc; i++, argv++) {
1810                char *arg = *argv;
1811
1812                if (*arg == '-') {
1813                        if (!strcmp(arg, "--all")) {
1814                                push_all = MATCH_REFS_ALL;
1815                                continue;
1816                        }
1817                        if (!strcmp(arg, "--force")) {
1818                                force_all = 1;
1819                                continue;
1820                        }
1821                        if (!strcmp(arg, "--dry-run")) {
1822                                dry_run = 1;
1823                                continue;
1824                        }
1825                        if (!strcmp(arg, "--verbose")) {
1826                                push_verbosely = 1;
1827                                http_is_verbose = 1;
1828                                continue;
1829                        }
1830                        if (!strcmp(arg, "-d")) {
1831                                delete_branch = 1;
1832                                continue;
1833                        }
1834                        if (!strcmp(arg, "-D")) {
1835                                delete_branch = 1;
1836                                force_delete = 1;
1837                                continue;
1838                        }
1839                }
1840                if (!repo->url) {
1841                        char *path = strstr(arg, "//");
1842                        repo->url = arg;
1843                        repo->path_len = strlen(arg);
1844                        if (path) {
1845                                repo->path = strchr(path+2, '/');
1846                                if (repo->path)
1847                                        repo->path_len = strlen(repo->path);
1848                        }
1849                        continue;
1850                }
1851                refspec = argv;
1852                nr_refspec = argc - i;
1853                break;
1854        }
1855
1856#ifndef USE_CURL_MULTI
1857        die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
1858#endif
1859
1860        if (!repo->url)
1861                usage(http_push_usage);
1862
1863        if (delete_branch && nr_refspec != 1)
1864                die("You must specify only one branch name when deleting a remote branch");
1865
1866        memset(remote_dir_exists, -1, 256);
1867
1868        /*
1869         * Create a minimum remote by hand to give to http_init(),
1870         * primarily to allow it to look at the URL.
1871         */
1872        remote = xcalloc(sizeof(*remote), 1);
1873        ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
1874        remote->url[remote->url_nr++] = repo->url;
1875        http_init(remote);
1876
1877        if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
1878                rewritten_url = xmalloc(strlen(repo->url)+2);
1879                strcpy(rewritten_url, repo->url);
1880                strcat(rewritten_url, "/");
1881                repo->path = rewritten_url + (repo->path - repo->url);
1882                repo->path_len++;
1883                repo->url = rewritten_url;
1884        }
1885
1886#ifdef USE_CURL_MULTI
1887        is_running_queue = 0;
1888#endif
1889
1890        /* Verify DAV compliance/lock support */
1891        if (!locking_available()) {
1892                rc = 1;
1893                goto cleanup;
1894        }
1895
1896        sigchain_push_common(remove_locks_on_signal);
1897
1898        /* Check whether the remote has server info files */
1899        repo->can_update_info_refs = 0;
1900        repo->has_info_refs = remote_exists("info/refs");
1901        repo->has_info_packs = remote_exists("objects/info/packs");
1902        if (repo->has_info_refs) {
1903                info_ref_lock = lock_remote("info/refs", LOCK_TIME);
1904                if (info_ref_lock)
1905                        repo->can_update_info_refs = 1;
1906                else {
1907                        error("cannot lock existing info/refs");
1908                        rc = 1;
1909                        goto cleanup;
1910                }
1911        }
1912        if (repo->has_info_packs)
1913                fetch_indices();
1914
1915        /* Get a list of all local and remote heads to validate refspecs */
1916        local_refs = get_local_heads();
1917        fprintf(stderr, "Fetching remote heads...\n");
1918        get_dav_remote_heads();
1919        run_request_queue();
1920
1921        /* Remove a remote branch if -d or -D was specified */
1922        if (delete_branch) {
1923                if (delete_remote_branch(refspec[0], force_delete) == -1)
1924                        fprintf(stderr, "Unable to delete remote branch %s\n",
1925                                refspec[0]);
1926                goto cleanup;
1927        }
1928
1929        /* match them up */
1930        if (!remote_tail)
1931                remote_tail = &remote_refs;
1932        if (match_refs(local_refs, remote_refs, &remote_tail,
1933                       nr_refspec, (const char **) refspec, push_all)) {
1934                rc = -1;
1935                goto cleanup;
1936        }
1937        if (!remote_refs) {
1938                fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
1939                rc = 0;
1940                goto cleanup;
1941        }
1942
1943        new_refs = 0;
1944        for (ref = remote_refs; ref; ref = ref->next) {
1945                char old_hex[60], *new_hex;
1946                const char *commit_argv[4];
1947                int commit_argc;
1948                char *new_sha1_hex, *old_sha1_hex;
1949
1950                if (!ref->peer_ref)
1951                        continue;
1952
1953                if (is_zero_sha1(ref->peer_ref->new_sha1)) {
1954                        if (delete_remote_branch(ref->name, 1) == -1) {
1955                                error("Could not remove %s", ref->name);
1956                                rc = -4;
1957                        }
1958                        new_refs++;
1959                        continue;
1960                }
1961
1962                if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
1963                        if (push_verbosely || 1)
1964                                fprintf(stderr, "'%s': up-to-date\n", ref->name);
1965                        continue;
1966                }
1967
1968                if (!force_all &&
1969                    !is_zero_sha1(ref->old_sha1) &&
1970                    !ref->force) {
1971                        if (!has_sha1_file(ref->old_sha1) ||
1972                            !ref_newer(ref->peer_ref->new_sha1,
1973                                       ref->old_sha1)) {
1974                                /*
1975                                 * We do not have the remote ref, or
1976                                 * we know that the remote ref is not
1977                                 * an ancestor of what we are trying to
1978                                 * push.  Either way this can be losing
1979                                 * commits at the remote end and likely
1980                                 * we were not up to date to begin with.
1981                                 */
1982                                error("remote '%s' is not an ancestor of\n"
1983                                      "local '%s'.\n"
1984                                      "Maybe you are not up-to-date and "
1985                                      "need to pull first?",
1986                                      ref->name,
1987                                      ref->peer_ref->name);
1988                                rc = -2;
1989                                continue;
1990                        }
1991                }
1992                hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
1993                new_refs++;
1994                strcpy(old_hex, sha1_to_hex(ref->old_sha1));
1995                new_hex = sha1_to_hex(ref->new_sha1);
1996
1997                fprintf(stderr, "updating '%s'", ref->name);
1998                if (strcmp(ref->name, ref->peer_ref->name))
1999                        fprintf(stderr, " using '%s'", ref->peer_ref->name);
2000                fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2001                if (dry_run)
2002                        continue;
2003
2004                /* Lock remote branch ref */
2005                ref_lock = lock_remote(ref->name, LOCK_TIME);
2006                if (ref_lock == NULL) {
2007                        fprintf(stderr, "Unable to lock remote branch %s\n",
2008                                ref->name);
2009                        rc = 1;
2010                        continue;
2011                }
2012
2013                /* Set up revision info for this refspec */
2014                commit_argc = 3;
2015                new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2016                old_sha1_hex = NULL;
2017                commit_argv[1] = "--objects";
2018                commit_argv[2] = new_sha1_hex;
2019                if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2020                        old_sha1_hex = xmalloc(42);
2021                        sprintf(old_sha1_hex, "^%s",
2022                                sha1_to_hex(ref->old_sha1));
2023                        commit_argv[3] = old_sha1_hex;
2024                        commit_argc++;
2025                }
2026                init_revisions(&revs, setup_git_directory());
2027                setup_revisions(commit_argc, commit_argv, &revs, NULL);
2028                revs.edge_hint = 0; /* just in case */
2029                free(new_sha1_hex);
2030                if (old_sha1_hex) {
2031                        free(old_sha1_hex);
2032                        commit_argv[1] = NULL;
2033                }
2034
2035                /* Generate a list of objects that need to be pushed */
2036                pushing = 0;
2037                if (prepare_revision_walk(&revs))
2038                        die("revision walk setup failed");
2039                mark_edges_uninteresting(revs.commits, &revs, NULL);
2040                objects_to_send = get_delta(&revs, ref_lock);
2041                finish_all_active_slots();
2042
2043                /* Push missing objects to remote, this would be a
2044                   convenient time to pack them first if appropriate. */
2045                pushing = 1;
2046                if (objects_to_send)
2047                        fprintf(stderr, "    sending %d objects\n",
2048                                objects_to_send);
2049
2050                run_request_queue();
2051
2052                /* Update the remote branch if all went well */
2053                if (aborted || !update_remote(ref->new_sha1, ref_lock))
2054                        rc = 1;
2055
2056                if (!rc)
2057                        fprintf(stderr, "    done\n");
2058                unlock_remote(ref_lock);
2059                check_locks();
2060        }
2061
2062        /* Update remote server info if appropriate */
2063        if (repo->has_info_refs && new_refs) {
2064                if (info_ref_lock && repo->can_update_info_refs) {
2065                        fprintf(stderr, "Updating remote server info\n");
2066                        if (!dry_run)
2067                                update_remote_info_refs(info_ref_lock);
2068                } else {
2069                        fprintf(stderr, "Unable to update server info\n");
2070                }
2071        }
2072
2073 cleanup:
2074        free(rewritten_url);
2075        if (info_ref_lock)
2076                unlock_remote(info_ref_lock);
2077        free(repo);
2078
2079        http_cleanup();
2080
2081        request = request_queue_head;
2082        while (request != NULL) {
2083                next_request = request->next;
2084                release_request(request);
2085                request = next_request;
2086        }
2087
2088        return rc;
2089}