Andrew's git / gitweb.git / http-push.c
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http-push.con commit Merge branch 'np/delta' into next (d2540f0)
   1#include "cache.h"
   2#include "commit.h"
   3#include "pack.h"
   4#include "fetch.h"
   5#include "tag.h"
   6#include "blob.h"
   7#include "http.h"
   8
   9#include <expat.h>
  10
  11static const char http_push_usage[] =
  12"git-http-push [--complete] [--force] [--verbose] <url> <ref> [<ref>...]\n";
  13
  14#ifndef XML_STATUS_OK
  15enum XML_Status {
  16  XML_STATUS_OK = 1,
  17  XML_STATUS_ERROR = 0
  18};
  19#define XML_STATUS_OK    1
  20#define XML_STATUS_ERROR 0
  21#endif
  22
  23#define RANGE_HEADER_SIZE 30
  24
  25/* DAV methods */
  26#define DAV_LOCK "LOCK"
  27#define DAV_MKCOL "MKCOL"
  28#define DAV_MOVE "MOVE"
  29#define DAV_PROPFIND "PROPFIND"
  30#define DAV_PUT "PUT"
  31#define DAV_UNLOCK "UNLOCK"
  32
  33/* DAV lock flags */
  34#define DAV_PROP_LOCKWR (1u << 0)
  35#define DAV_PROP_LOCKEX (1u << 1)
  36#define DAV_LOCK_OK (1u << 2)
  37
  38/* DAV XML properties */
  39#define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  40#define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  41#define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  42#define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  43#define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  44#define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  45
  46/* DAV request body templates */
  47#define PROPFIND_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>"
  48#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>"
  49
  50#define LOCK_TIME 600
  51#define LOCK_REFRESH 30
  52
  53static int pushing = 0;
  54static int aborted = 0;
  55static char remote_dir_exists[256];
  56
  57static struct curl_slist *no_pragma_header;
  58static struct curl_slist *default_headers;
  59
  60static int push_verbosely = 0;
  61static int push_all = 0;
  62static int force_all = 0;
  63
  64struct repo
  65{
  66        char *url;
  67        struct packed_git *packs;
  68};
  69
  70static struct repo *remote = NULL;
  71
  72enum transfer_state {
  73        NEED_CHECK,
  74        RUN_HEAD,
  75        NEED_PUSH,
  76        RUN_MKCOL,
  77        RUN_PUT,
  78        RUN_MOVE,
  79        ABORTED,
  80        COMPLETE,
  81};
  82
  83struct transfer_request
  84{
  85        unsigned char sha1[20];
  86        char *url;
  87        char *dest;
  88        struct active_lock *lock;
  89        struct curl_slist *headers;
  90        struct buffer buffer;
  91        char filename[PATH_MAX];
  92        char tmpfile[PATH_MAX];
  93        enum transfer_state state;
  94        CURLcode curl_result;
  95        char errorstr[CURL_ERROR_SIZE];
  96        long http_code;
  97        unsigned char real_sha1[20];
  98        SHA_CTX c;
  99        z_stream stream;
 100        int zret;
 101        int rename;
 102        struct active_request_slot *slot;
 103        struct transfer_request *next;
 104};
 105
 106static struct transfer_request *request_queue_head = NULL;
 107
 108struct xml_ctx
 109{
 110        char *name;
 111        int len;
 112        char *cdata;
 113        void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 114        void *userData;
 115};
 116
 117struct active_lock
 118{
 119        char *url;
 120        char *owner;
 121        char *token;
 122        time_t start_time;
 123        long timeout;
 124        int refreshing;
 125};
 126
 127static void finish_request(struct transfer_request *request);
 128
 129static void process_response(void *callback_data)
 130{
 131        struct transfer_request *request =
 132                (struct transfer_request *)callback_data;
 133
 134        finish_request(request);
 135}
 136
 137static void start_check(struct transfer_request *request)
 138{
 139        char *hex = sha1_to_hex(request->sha1);
 140        struct active_request_slot *slot;
 141        char *posn;
 142
 143        request->url = xmalloc(strlen(remote->url) + 55);
 144        strcpy(request->url, remote->url);
 145        posn = request->url + strlen(remote->url);
 146        strcpy(posn, "objects/");
 147        posn += 8;
 148        memcpy(posn, hex, 2);
 149        posn += 2;
 150        *(posn++) = '/';
 151        strcpy(posn, hex + 2);
 152
 153        slot = get_active_slot();
 154        slot->callback_func = process_response;
 155        slot->callback_data = request;
 156        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 157        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 158        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 159
 160        if (start_active_slot(slot)) {
 161                request->slot = slot;
 162                request->state = RUN_HEAD;
 163        } else {
 164                request->state = ABORTED;
 165                free(request->url);
 166                request->url = NULL;
 167        }
 168}
 169
 170static void start_mkcol(struct transfer_request *request)
 171{
 172        char *hex = sha1_to_hex(request->sha1);
 173        struct active_request_slot *slot;
 174        char *posn;
 175
 176        request->url = xmalloc(strlen(remote->url) + 13);
 177        strcpy(request->url, remote->url);
 178        posn = request->url + strlen(remote->url);
 179        strcpy(posn, "objects/");
 180        posn += 8;
 181        memcpy(posn, hex, 2);
 182        posn += 2;
 183        strcpy(posn, "/");
 184
 185        slot = get_active_slot();
 186        slot->callback_func = process_response;
 187        slot->callback_data = request;
 188        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 189        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 190        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 191        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 192        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 193
 194        if (start_active_slot(slot)) {
 195                request->slot = slot;
 196                request->state = RUN_MKCOL;
 197        } else {
 198                request->state = ABORTED;
 199                free(request->url);
 200                request->url = NULL;
 201        }
 202}
 203
 204static void start_put(struct transfer_request *request)
 205{
 206        char *hex = sha1_to_hex(request->sha1);
 207        struct active_request_slot *slot;
 208        char *posn;
 209        char type[20];
 210        char hdr[50];
 211        void *unpacked;
 212        unsigned long len;
 213        int hdrlen;
 214        ssize_t size;
 215        z_stream stream;
 216
 217        unpacked = read_sha1_file(request->sha1, type, &len);
 218        hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 219
 220        /* Set it up */
 221        memset(&stream, 0, sizeof(stream));
 222        deflateInit(&stream, Z_BEST_COMPRESSION);
 223        size = deflateBound(&stream, len + hdrlen);
 224        request->buffer.buffer = xmalloc(size);
 225
 226        /* Compress it */
 227        stream.next_out = request->buffer.buffer;
 228        stream.avail_out = size;
 229
 230        /* First header.. */
 231        stream.next_in = (void *)hdr;
 232        stream.avail_in = hdrlen;
 233        while (deflate(&stream, 0) == Z_OK)
 234                /* nothing */;
 235
 236        /* Then the data itself.. */
 237        stream.next_in = unpacked;
 238        stream.avail_in = len;
 239        while (deflate(&stream, Z_FINISH) == Z_OK)
 240                /* nothing */;
 241        deflateEnd(&stream);
 242        free(unpacked);
 243
 244        request->buffer.size = stream.total_out;
 245        request->buffer.posn = 0;
 246
 247        request->url = xmalloc(strlen(remote->url) + 
 248                               strlen(request->lock->token) + 51);
 249        strcpy(request->url, remote->url);
 250        posn = request->url + strlen(remote->url);
 251        strcpy(posn, "objects/");
 252        posn += 8;
 253        memcpy(posn, hex, 2);
 254        posn += 2;
 255        *(posn++) = '/';
 256        strcpy(posn, hex + 2);
 257        request->dest = xmalloc(strlen(request->url) + 14);
 258        sprintf(request->dest, "Destination: %s", request->url);
 259        posn += 38;
 260        *(posn++) = '.';
 261        strcpy(posn, request->lock->token);
 262
 263        slot = get_active_slot();
 264        slot->callback_func = process_response;
 265        slot->callback_data = request;
 266        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 267        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 268        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 269        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 270        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 271        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 272        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 273        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 274        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 275
 276        if (start_active_slot(slot)) {
 277                request->slot = slot;
 278                request->state = RUN_PUT;
 279        } else {
 280                request->state = ABORTED;
 281                free(request->url);
 282                request->url = NULL;
 283        }
 284}
 285
 286static void start_move(struct transfer_request *request)
 287{
 288        struct active_request_slot *slot;
 289        struct curl_slist *dav_headers = NULL;
 290
 291        slot = get_active_slot();
 292        slot->callback_func = process_response;
 293        slot->callback_data = request;
 294        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 295        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 296        dav_headers = curl_slist_append(dav_headers, request->dest);
 297        dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 298        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 299        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 300        curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 301
 302        if (start_active_slot(slot)) {
 303                request->slot = slot;
 304                request->state = RUN_MOVE;
 305        } else {
 306                request->state = ABORTED;
 307                free(request->url);
 308                request->url = NULL;
 309        }
 310}
 311
 312static int refresh_lock(struct active_lock *lock)
 313{
 314        struct active_request_slot *slot;
 315        char *if_header;
 316        char timeout_header[25];
 317        struct curl_slist *dav_headers = NULL;
 318        int rc = 0;
 319
 320        lock->refreshing = 1;
 321
 322        if_header = xmalloc(strlen(lock->token) + 25);
 323        sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 324        sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 325        dav_headers = curl_slist_append(dav_headers, if_header);
 326        dav_headers = curl_slist_append(dav_headers, timeout_header);
 327
 328        slot = get_active_slot();
 329        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 330        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 331        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 332        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 333        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 334
 335        if (start_active_slot(slot)) {
 336                run_active_slot(slot);
 337                if (slot->curl_result != CURLE_OK) {
 338                        fprintf(stderr, "Got HTTP error %ld\n", slot->http_code);
 339                } else {
 340                        lock->start_time = time(NULL);
 341                        rc = 1;
 342                }
 343        }
 344
 345        lock->refreshing = 0;
 346        curl_slist_free_all(dav_headers);
 347        free(if_header);
 348
 349        return rc;
 350}
 351
 352static void finish_request(struct transfer_request *request)
 353{
 354        time_t current_time = time(NULL);
 355        int time_remaining;
 356
 357        request->curl_result =  request->slot->curl_result;
 358        request->http_code = request->slot->http_code;
 359        request->slot = NULL;
 360
 361        /* Refresh the lock if it is close to timing out */
 362        time_remaining = request->lock->start_time + request->lock->timeout
 363                - current_time;
 364        if (time_remaining < LOCK_REFRESH && !request->lock->refreshing) {
 365                if (!refresh_lock(request->lock)) {
 366                        fprintf(stderr, "Unable to refresh remote lock\n");
 367                        aborted = 1;
 368                }
 369        }
 370
 371        if (request->headers != NULL)
 372                curl_slist_free_all(request->headers);
 373
 374        /* URL is reused for MOVE after PUT */
 375        if (request->state != RUN_PUT) {
 376                free(request->url);
 377                request->url = NULL;
 378        }               
 379
 380        if (request->state == RUN_HEAD) {
 381                if (request->http_code == 404) {
 382                        request->state = NEED_PUSH;
 383                } else if (request->curl_result == CURLE_OK) {
 384                        remote_dir_exists[request->sha1[0]] = 1;
 385                        request->state = COMPLETE;
 386                } else {
 387                        fprintf(stderr, "HEAD %s failed, aborting (%d/%ld)\n",
 388                                sha1_to_hex(request->sha1),
 389                                request->curl_result, request->http_code);
 390                        request->state = ABORTED;
 391                        aborted = 1;
 392                }
 393        } else if (request->state == RUN_MKCOL) {
 394                if (request->curl_result == CURLE_OK ||
 395                    request->http_code == 405) {
 396                        remote_dir_exists[request->sha1[0]] = 1;
 397                        start_put(request);
 398                } else {
 399                        fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 400                                sha1_to_hex(request->sha1),
 401                                request->curl_result, request->http_code);
 402                        request->state = ABORTED;
 403                        aborted = 1;
 404                }
 405        } else if (request->state == RUN_PUT) {
 406                if (request->curl_result == CURLE_OK) {
 407                        start_move(request);
 408                } else {
 409                        fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 410                                sha1_to_hex(request->sha1),
 411                                request->curl_result, request->http_code);
 412                        request->state = ABORTED;
 413                        aborted = 1;
 414                }
 415        } else if (request->state == RUN_MOVE) {
 416                if (request->curl_result == CURLE_OK) {
 417                        if (push_verbosely)
 418                                fprintf(stderr,
 419                                        "sent %s\n",
 420                                        sha1_to_hex(request->sha1));
 421                        request->state = COMPLETE;
 422                } else {
 423                        fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 424                                sha1_to_hex(request->sha1),
 425                                request->curl_result, request->http_code);
 426                        request->state = ABORTED;
 427                        aborted = 1;
 428                }
 429        }
 430}
 431
 432static void release_request(struct transfer_request *request)
 433{
 434        struct transfer_request *entry = request_queue_head;
 435
 436        if (request == request_queue_head) {
 437                request_queue_head = request->next;
 438        } else {
 439                while (entry->next != NULL && entry->next != request)
 440                        entry = entry->next;
 441                if (entry->next == request)
 442                        entry->next = entry->next->next;
 443        }
 444
 445        if (request->url != NULL)
 446                free(request->url);
 447        free(request);
 448}
 449
 450void fill_active_slots(void)
 451{
 452        struct transfer_request *request = request_queue_head;
 453        struct active_request_slot *slot = active_queue_head;
 454        int num_transfers;
 455
 456        if (aborted)
 457                return;
 458
 459        while (active_requests < max_requests && request != NULL) {
 460                if (!pushing && request->state == NEED_CHECK) {
 461                        start_check(request);
 462                        curl_multi_perform(curlm, &num_transfers);
 463                } else if (pushing && request->state == NEED_PUSH) {
 464                        if (remote_dir_exists[request->sha1[0]])
 465                                start_put(request);
 466                        else
 467                                start_mkcol(request);
 468                        curl_multi_perform(curlm, &num_transfers);
 469                }
 470                request = request->next;
 471        }
 472
 473        while (slot != NULL) {
 474                if (!slot->in_use && slot->curl != NULL) {
 475                        curl_easy_cleanup(slot->curl);
 476                        slot->curl = NULL;
 477                }
 478                slot = slot->next;
 479        }                               
 480}
 481
 482static void add_request(unsigned char *sha1, struct active_lock *lock)
 483{
 484        struct transfer_request *request = request_queue_head;
 485        struct packed_git *target;
 486        
 487        while (request != NULL && memcmp(request->sha1, sha1, 20))
 488                request = request->next;
 489        if (request != NULL)
 490                return;
 491
 492        target = find_sha1_pack(sha1, remote->packs);
 493        if (target)
 494                return;
 495
 496        request = xmalloc(sizeof(*request));
 497        memcpy(request->sha1, sha1, 20);
 498        request->url = NULL;
 499        request->lock = lock;
 500        request->headers = NULL;
 501        request->state = NEED_CHECK;
 502        request->next = request_queue_head;
 503        request_queue_head = request;
 504
 505        fill_active_slots();
 506        step_active_slots();
 507}
 508
 509static int fetch_index(unsigned char *sha1)
 510{
 511        char *hex = sha1_to_hex(sha1);
 512        char *filename;
 513        char *url;
 514        char tmpfile[PATH_MAX];
 515        long prev_posn = 0;
 516        char range[RANGE_HEADER_SIZE];
 517        struct curl_slist *range_header = NULL;
 518
 519        FILE *indexfile;
 520        struct active_request_slot *slot;
 521
 522        /* Don't use the index if the pack isn't there */
 523        url = xmalloc(strlen(remote->url) + 65);
 524        sprintf(url, "%s/objects/pack/pack-%s.pack", remote->url, hex);
 525        slot = get_active_slot();
 526        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 527        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 528        if (start_active_slot(slot)) {
 529                run_active_slot(slot);
 530                if (slot->curl_result != CURLE_OK) {
 531                        free(url);
 532                        return error("Unable to verify pack %s is available",
 533                                     hex);
 534                }
 535        } else {
 536                return error("Unable to start request");
 537        }
 538
 539        if (has_pack_index(sha1))
 540                return 0;
 541
 542        if (push_verbosely)
 543                fprintf(stderr, "Getting index for pack %s\n", hex);
 544        
 545        sprintf(url, "%s/objects/pack/pack-%s.idx", remote->url, hex);
 546        
 547        filename = sha1_pack_index_name(sha1);
 548        snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 549        indexfile = fopen(tmpfile, "a");
 550        if (!indexfile)
 551                return error("Unable to open local file %s for pack index",
 552                             filename);
 553
 554        slot = get_active_slot();
 555        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 556        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 557        curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 558        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 559        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 560        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 561        slot->local = indexfile;
 562
 563        /* If there is data present from a previous transfer attempt,
 564           resume where it left off */
 565        prev_posn = ftell(indexfile);
 566        if (prev_posn>0) {
 567                if (push_verbosely)
 568                        fprintf(stderr,
 569                                "Resuming fetch of index for pack %s at byte %ld\n",
 570                                hex, prev_posn);
 571                sprintf(range, "Range: bytes=%ld-", prev_posn);
 572                range_header = curl_slist_append(range_header, range);
 573                curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 574        }
 575
 576        if (start_active_slot(slot)) {
 577                run_active_slot(slot);
 578                if (slot->curl_result != CURLE_OK) {
 579                        free(url);
 580                        fclose(indexfile);
 581                        return error("Unable to get pack index %s\n%s", url,
 582                                     curl_errorstr);
 583                }
 584        } else {
 585                free(url);
 586                fclose(indexfile);
 587                return error("Unable to start request");
 588        }
 589
 590        free(url);
 591        fclose(indexfile);
 592
 593        return move_temp_to_file(tmpfile, filename);
 594}
 595
 596static int setup_index(unsigned char *sha1)
 597{
 598        struct packed_git *new_pack;
 599
 600        if (fetch_index(sha1))
 601                return -1;
 602
 603        new_pack = parse_pack_index(sha1);
 604        new_pack->next = remote->packs;
 605        remote->packs = new_pack;
 606        return 0;
 607}
 608
 609static int fetch_indices(void)
 610{
 611        unsigned char sha1[20];
 612        char *url;
 613        struct buffer buffer;
 614        char *data;
 615        int i = 0;
 616
 617        struct active_request_slot *slot;
 618
 619        data = xmalloc(4096);
 620        memset(data, 0, 4096);
 621        buffer.size = 4096;
 622        buffer.posn = 0;
 623        buffer.buffer = data;
 624
 625        if (push_verbosely)
 626                fprintf(stderr, "Getting pack list\n");
 627        
 628        url = xmalloc(strlen(remote->url) + 21);
 629        sprintf(url, "%s/objects/info/packs", remote->url);
 630
 631        slot = get_active_slot();
 632        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 633        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 634        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 635        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 636        if (start_active_slot(slot)) {
 637                run_active_slot(slot);
 638                if (slot->curl_result != CURLE_OK) {
 639                        free(buffer.buffer);
 640                        free(url);
 641                        if (slot->http_code == 404)
 642                                return 0;
 643                        else
 644                                return error("%s", curl_errorstr);
 645                }
 646        } else {
 647                free(buffer.buffer);
 648                free(url);
 649                return error("Unable to start request");
 650        }
 651        free(url);
 652
 653        data = buffer.buffer;
 654        while (i < buffer.posn) {
 655                switch (data[i]) {
 656                case 'P':
 657                        i++;
 658                        if (i + 52 < buffer.posn &&
 659                            !strncmp(data + i, " pack-", 6) &&
 660                            !strncmp(data + i + 46, ".pack\n", 6)) {
 661                                get_sha1_hex(data + i + 6, sha1);
 662                                setup_index(sha1);
 663                                i += 51;
 664                                break;
 665                        }
 666                default:
 667                        while (data[i] != '\n')
 668                                i++;
 669                }
 670                i++;
 671        }
 672
 673        free(buffer.buffer);
 674        return 0;
 675}
 676
 677static inline int needs_quote(int ch)
 678{
 679        switch (ch) {
 680        case '/': case '-': case '.':
 681        case 'A'...'Z': case 'a'...'z': case '0'...'9':
 682                return 0;
 683        default:
 684                return 1;
 685        }
 686}
 687
 688static inline int hex(int v)
 689{
 690        if (v < 10) return '0' + v;
 691        else return 'A' + v - 10;
 692}
 693
 694static char *quote_ref_url(const char *base, const char *ref)
 695{
 696        const char *cp;
 697        char *dp, *qref;
 698        int len, baselen, ch;
 699
 700        baselen = strlen(base);
 701        len = baselen + 12; /* "refs/heads/" + NUL */
 702        for (cp = ref; (ch = *cp) != 0; cp++, len++)
 703                if (needs_quote(ch))
 704                        len += 2; /* extra two hex plus replacement % */
 705        qref = xmalloc(len);
 706        memcpy(qref, base, baselen);
 707        memcpy(qref + baselen, "refs/heads/", 11);
 708        for (cp = ref, dp = qref + baselen + 11; (ch = *cp) != 0; cp++) {
 709                if (needs_quote(ch)) {
 710                        *dp++ = '%';
 711                        *dp++ = hex((ch >> 4) & 0xF);
 712                        *dp++ = hex(ch & 0xF);
 713                }
 714                else
 715                        *dp++ = ch;
 716        }
 717        *dp = 0;
 718
 719        return qref;
 720}
 721
 722int fetch_ref(char *ref, unsigned char *sha1)
 723{
 724        char *url;
 725        char hex[42];
 726        struct buffer buffer;
 727        char *base = remote->url;
 728        struct active_request_slot *slot;
 729        buffer.size = 41;
 730        buffer.posn = 0;
 731        buffer.buffer = hex;
 732        hex[41] = '\0';
 733        
 734        url = quote_ref_url(base, ref);
 735        slot = get_active_slot();
 736        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 737        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 738        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 739        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 740        if (start_active_slot(slot)) {
 741                run_active_slot(slot);
 742                if (slot->curl_result != CURLE_OK)
 743                        return error("Couldn't get %s for %s\n%s",
 744                                     url, ref, curl_errorstr);
 745        } else {
 746                return error("Unable to start request");
 747        }
 748
 749        hex[40] = '\0';
 750        get_sha1_hex(hex, sha1);
 751        return 0;
 752}
 753
 754static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 755{
 756        int *lock_flags = (int *)ctx->userData;
 757
 758        if (tag_closed) {
 759                if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 760                        if ((*lock_flags & DAV_PROP_LOCKEX) &&
 761                            (*lock_flags & DAV_PROP_LOCKWR)) {
 762                                *lock_flags |= DAV_LOCK_OK;
 763                        }
 764                        *lock_flags &= DAV_LOCK_OK;
 765                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 766                        *lock_flags |= DAV_PROP_LOCKWR;
 767                } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 768                        *lock_flags |= DAV_PROP_LOCKEX;
 769                }
 770        }
 771}
 772
 773static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 774{
 775        struct active_lock *lock = (struct active_lock *)ctx->userData;
 776
 777        if (tag_closed && ctx->cdata) {
 778                if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 779                        lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 780                        strcpy(lock->owner, ctx->cdata);
 781                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 782                        if (!strncmp(ctx->cdata, "Second-", 7))
 783                                lock->timeout =
 784                                        strtol(ctx->cdata + 7, NULL, 10);
 785                } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 786                        if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
 787                                lock->token = xmalloc(strlen(ctx->cdata) - 15);
 788                                strcpy(lock->token, ctx->cdata + 16);
 789                        }
 790                }
 791        }
 792}
 793
 794static void
 795xml_start_tag(void *userData, const char *name, const char **atts)
 796{
 797        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 798        const char *c = index(name, ':');
 799        int new_len;
 800
 801        if (c == NULL)
 802                c = name;
 803        else
 804                c++;
 805
 806        new_len = strlen(ctx->name) + strlen(c) + 2;
 807
 808        if (new_len > ctx->len) {
 809                ctx->name = xrealloc(ctx->name, new_len);
 810                ctx->len = new_len;
 811        }
 812        strcat(ctx->name, ".");
 813        strcat(ctx->name, c);
 814
 815        if (ctx->cdata) {
 816                free(ctx->cdata);
 817                ctx->cdata = NULL;
 818        }
 819
 820        ctx->userFunc(ctx, 0);
 821}
 822
 823static void
 824xml_end_tag(void *userData, const char *name)
 825{
 826        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 827        const char *c = index(name, ':');
 828        char *ep;
 829
 830        ctx->userFunc(ctx, 1);
 831
 832        if (c == NULL)
 833                c = name;
 834        else
 835                c++;
 836
 837        ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
 838        *ep = 0;
 839}
 840
 841static void
 842xml_cdata(void *userData, const XML_Char *s, int len)
 843{
 844        struct xml_ctx *ctx = (struct xml_ctx *)userData;
 845        if (ctx->cdata)
 846                free(ctx->cdata);
 847        ctx->cdata = xcalloc(len+1, 1);
 848        strncpy(ctx->cdata, s, len);
 849}
 850
 851static struct active_lock *lock_remote(char *file, long timeout)
 852{
 853        struct active_request_slot *slot;
 854        struct buffer out_buffer;
 855        struct buffer in_buffer;
 856        char *out_data;
 857        char *in_data;
 858        char *url;
 859        char *ep;
 860        char timeout_header[25];
 861        struct active_lock *new_lock = NULL;
 862        XML_Parser parser = XML_ParserCreate(NULL);
 863        enum XML_Status result;
 864        struct curl_slist *dav_headers = NULL;
 865        struct xml_ctx ctx;
 866
 867        url = xmalloc(strlen(remote->url) + strlen(file) + 1);
 868        sprintf(url, "%s%s", remote->url, file);
 869
 870        /* Make sure leading directories exist for the remote ref */
 871        ep = strchr(url + strlen(remote->url) + 11, '/');
 872        while (ep) {
 873                *ep = 0;
 874                slot = get_active_slot();
 875                curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 876                curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 877                curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 878                curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 879                if (start_active_slot(slot)) {
 880                        run_active_slot(slot);
 881                        if (slot->curl_result != CURLE_OK &&
 882                            slot->http_code != 405) {
 883                                fprintf(stderr,
 884                                        "Unable to create branch path %s\n",
 885                                        url);
 886                                free(url);
 887                                return NULL;
 888                        }
 889                } else {
 890                        fprintf(stderr, "Unable to start request\n");
 891                        free(url);
 892                        return NULL;
 893                }
 894                *ep = '/';
 895                ep = strchr(ep + 1, '/');
 896        }
 897
 898        out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
 899        out_data = xmalloc(out_buffer.size + 1);
 900        snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
 901        out_buffer.posn = 0;
 902        out_buffer.buffer = out_data;
 903
 904        in_buffer.size = 4096;
 905        in_data = xmalloc(in_buffer.size);
 906        in_buffer.posn = 0;
 907        in_buffer.buffer = in_data;
 908
 909        sprintf(timeout_header, "Timeout: Second-%ld", timeout);
 910        dav_headers = curl_slist_append(dav_headers, timeout_header);
 911        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
 912
 913        slot = get_active_slot();
 914        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
 915        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
 916        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 917        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
 918        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 919        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 920        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 921        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 922        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 923
 924        new_lock = xcalloc(1, sizeof(*new_lock));
 925        new_lock->owner = NULL;
 926        new_lock->token = NULL;
 927        new_lock->timeout = -1;
 928        new_lock->refreshing = 0;
 929
 930        if (start_active_slot(slot)) {
 931                run_active_slot(slot);
 932                if (slot->curl_result == CURLE_OK) {
 933                        ctx.name = xcalloc(10, 1);
 934                        ctx.len = 0;
 935                        ctx.cdata = NULL;
 936                        ctx.userFunc = handle_new_lock_ctx;
 937                        ctx.userData = new_lock;
 938                        XML_SetUserData(parser, &ctx);
 939                        XML_SetElementHandler(parser, xml_start_tag,
 940                                              xml_end_tag);
 941                        XML_SetCharacterDataHandler(parser, xml_cdata);
 942                        result = XML_Parse(parser, in_buffer.buffer,
 943                                           in_buffer.posn, 1);
 944                        free(ctx.name);
 945                        if (result != XML_STATUS_OK) {
 946                                fprintf(stderr, "XML error: %s\n",
 947                                        XML_ErrorString(
 948                                                XML_GetErrorCode(parser)));
 949                                new_lock->timeout = -1;
 950                        }
 951                }
 952        } else {
 953                fprintf(stderr, "Unable to start request\n");
 954        }
 955
 956        curl_slist_free_all(dav_headers);
 957        free(out_data);
 958        free(in_data);
 959
 960        if (new_lock->token == NULL || new_lock->timeout <= 0) {
 961                if (new_lock->token != NULL)
 962                        free(new_lock->token);
 963                if (new_lock->owner != NULL)
 964                        free(new_lock->owner);
 965                free(url);
 966                free(new_lock);
 967                new_lock = NULL;
 968        } else {
 969                new_lock->url = url;
 970                new_lock->start_time = time(NULL);
 971        }
 972
 973        return new_lock;
 974}
 975
 976static int unlock_remote(struct active_lock *lock)
 977{
 978        struct active_request_slot *slot;
 979        char *lock_token_header;
 980        struct curl_slist *dav_headers = NULL;
 981        int rc = 0;
 982
 983        lock_token_header = xmalloc(strlen(lock->token) + 31);
 984        sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
 985                lock->token);
 986        dav_headers = curl_slist_append(dav_headers, lock_token_header);
 987
 988        slot = get_active_slot();
 989        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 990        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 991        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
 992        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 993
 994        if (start_active_slot(slot)) {
 995                run_active_slot(slot);
 996                if (slot->curl_result == CURLE_OK)
 997                        rc = 1;
 998                else
 999                        fprintf(stderr, "Got HTTP error %ld\n",
1000                                slot->http_code);
1001        } else {
1002                fprintf(stderr, "Unable to start request\n");
1003        }
1004
1005        curl_slist_free_all(dav_headers);
1006        free(lock_token_header);
1007
1008        if (lock->owner != NULL)
1009                free(lock->owner);
1010        free(lock->url);
1011        free(lock->token);
1012        free(lock);
1013
1014        return rc;
1015}
1016
1017static int locking_available(void)
1018{
1019        struct active_request_slot *slot;
1020        struct buffer in_buffer;
1021        struct buffer out_buffer;
1022        char *in_data;
1023        char *out_data;
1024        XML_Parser parser = XML_ParserCreate(NULL);
1025        enum XML_Status result;
1026        struct curl_slist *dav_headers = NULL;
1027        struct xml_ctx ctx;
1028        int lock_flags = 0;
1029
1030        out_buffer.size = strlen(PROPFIND_REQUEST) + strlen(remote->url) - 2;
1031        out_data = xmalloc(out_buffer.size + 1);
1032        snprintf(out_data, out_buffer.size + 1, PROPFIND_REQUEST, remote->url);
1033        out_buffer.posn = 0;
1034        out_buffer.buffer = out_data;
1035
1036        in_buffer.size = 4096;
1037        in_data = xmalloc(in_buffer.size);
1038        in_buffer.posn = 0;
1039        in_buffer.buffer = in_data;
1040
1041        dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1042        dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1043        
1044        slot = get_active_slot();
1045        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1046        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1047        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1048        curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1049        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1050        curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1051        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1052        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1053        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1054
1055        if (start_active_slot(slot)) {
1056                run_active_slot(slot);
1057                if (slot->curl_result == CURLE_OK) {
1058                        ctx.name = xcalloc(10, 1);
1059                        ctx.len = 0;
1060                        ctx.cdata = NULL;
1061                        ctx.userFunc = handle_lockprop_ctx;
1062                        ctx.userData = &lock_flags;
1063                        XML_SetUserData(parser, &ctx);
1064                        XML_SetElementHandler(parser, xml_start_tag,
1065                                              xml_end_tag);
1066                        result = XML_Parse(parser, in_buffer.buffer,
1067                                           in_buffer.posn, 1);
1068                        free(ctx.name);
1069
1070                        if (result != XML_STATUS_OK) {
1071                                fprintf(stderr, "XML error: %s\n",
1072                                        XML_ErrorString(
1073                                                XML_GetErrorCode(parser)));
1074                                lock_flags = 0;
1075                        }
1076                }
1077        } else {
1078                fprintf(stderr, "Unable to start request\n");
1079        }
1080
1081        free(out_data);
1082        free(in_buffer.buffer);
1083        curl_slist_free_all(dav_headers);
1084
1085        return lock_flags;
1086}
1087
1088static int is_ancestor(unsigned char *sha1, struct commit *commit)
1089{
1090        struct commit_list *parents;
1091
1092        if (parse_commit(commit))
1093                return 0;
1094        parents = commit->parents;
1095        for (; parents; parents = parents->next) {
1096                if (!memcmp(sha1, parents->item->object.sha1, 20)) {
1097                        return 1;
1098                } else if (parents->item->object.type == commit_type) {
1099                        if (is_ancestor(
1100                                    sha1,
1101                                    (struct commit *)&parents->item->object
1102                                    ))
1103                                return 1;
1104                }
1105        }
1106        return 0;
1107}
1108
1109static void get_delta(unsigned char *sha1, struct object *obj,
1110                      struct active_lock *lock)
1111{
1112        struct commit *commit;
1113        struct commit_list *parents;
1114        struct tree *tree;
1115        struct tree_entry_list *entry;
1116
1117        if (sha1 && !memcmp(sha1, obj->sha1, 20))
1118                return;
1119
1120        if (aborted)
1121                return;
1122
1123        if (obj->type == commit_type) {
1124                if (push_verbosely)
1125                        fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
1126                add_request(obj->sha1, lock);
1127                commit = (struct commit *)obj;
1128                if (parse_commit(commit)) {
1129                        fprintf(stderr, "Error parsing commit %s\n",
1130                                sha1_to_hex(obj->sha1));
1131                        aborted = 1;
1132                        return;
1133                }
1134                parents = commit->parents;
1135                for (; parents; parents = parents->next)
1136                        if (sha1 == NULL ||
1137                            memcmp(sha1, parents->item->object.sha1, 20))
1138                                get_delta(sha1, &parents->item->object,
1139                                          lock);
1140                get_delta(sha1, &commit->tree->object, lock);
1141        } else if (obj->type == tree_type) {
1142                if (push_verbosely)
1143                        fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
1144                add_request(obj->sha1, lock);
1145                tree = (struct tree *)obj;
1146                if (parse_tree(tree)) {
1147                        fprintf(stderr, "Error parsing tree %s\n",
1148                                sha1_to_hex(obj->sha1));
1149                        aborted = 1;
1150                        return;
1151                }
1152                entry = tree->entries;
1153                tree->entries = NULL;
1154                while (entry) {
1155                        struct tree_entry_list *next = entry->next;
1156                        get_delta(sha1, entry->item.any, lock);
1157                        free(entry->name);
1158                        free(entry);
1159                        entry = next;
1160                }
1161        } else if (obj->type == blob_type || obj->type == tag_type) {
1162                add_request(obj->sha1, lock);
1163        }
1164}
1165
1166static int update_remote(unsigned char *sha1, struct active_lock *lock)
1167{
1168        struct active_request_slot *slot;
1169        char *out_data;
1170        char *if_header;
1171        struct buffer out_buffer;
1172        struct curl_slist *dav_headers = NULL;
1173        int i;
1174
1175        if_header = xmalloc(strlen(lock->token) + 25);
1176        sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1177        dav_headers = curl_slist_append(dav_headers, if_header);
1178
1179        out_buffer.size = 41;
1180        out_data = xmalloc(out_buffer.size + 1);
1181        i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1182        if (i != out_buffer.size) {
1183                fprintf(stderr, "Unable to initialize PUT request body\n");
1184                return 0;
1185        }
1186        out_buffer.posn = 0;
1187        out_buffer.buffer = out_data;
1188
1189        slot = get_active_slot();
1190        curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1191        curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1192        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1193        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1194        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1195        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1196        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1197        curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1198        curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1199
1200        if (start_active_slot(slot)) {
1201                run_active_slot(slot);
1202                free(out_data);
1203                free(if_header);
1204                if (slot->curl_result != CURLE_OK) {
1205                        fprintf(stderr,
1206                                "PUT error: curl result=%d, HTTP code=%ld\n",
1207                                slot->curl_result, slot->http_code);
1208                        /* We should attempt recovery? */
1209                        return 0;
1210                }
1211        } else {
1212                free(out_data);
1213                free(if_header);
1214                fprintf(stderr, "Unable to start PUT request\n");
1215                return 0;
1216        }
1217
1218        return 1;
1219}
1220
1221int main(int argc, char **argv)
1222{
1223        struct transfer_request *request;
1224        struct transfer_request *next_request;
1225        int nr_refspec = 0;
1226        char **refspec = NULL;
1227        int do_remote_update;
1228        int new_branch;
1229        int force_this;
1230        char *local_ref;
1231        unsigned char local_sha1[20];
1232        struct object *local_object = NULL;
1233        char *remote_ref = NULL;
1234        unsigned char remote_sha1[20];
1235        struct active_lock *remote_lock;
1236        char *remote_path = NULL;
1237        int rc = 0;
1238        int i;
1239
1240        setup_git_directory();
1241        setup_ident();
1242
1243        remote = xmalloc(sizeof(*remote));
1244        remote->url = NULL;
1245        remote->packs = NULL;
1246
1247        argv++;
1248        for (i = 1; i < argc; i++, argv++) {
1249                char *arg = *argv;
1250
1251                if (*arg == '-') {
1252                        if (!strcmp(arg, "--complete")) {
1253                                push_all = 1;
1254                                continue;
1255                        }
1256                        if (!strcmp(arg, "--force")) {
1257                                force_all = 1;
1258                                continue;
1259                        }
1260                        if (!strcmp(arg, "--verbose")) {
1261                                push_verbosely = 1;
1262                                continue;
1263                        }
1264                        usage(http_push_usage);
1265                }
1266                if (!remote->url) {
1267                        remote->url = arg;
1268                        continue;
1269                }
1270                refspec = argv;
1271                nr_refspec = argc - i;
1272                break;
1273        }
1274
1275        if (!remote->url)
1276                usage(http_push_usage);
1277
1278        memset(remote_dir_exists, 0, 256);
1279
1280        http_init();
1281
1282        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
1283        default_headers = curl_slist_append(default_headers, "Range:");
1284        default_headers = curl_slist_append(default_headers, "Destination:");
1285        default_headers = curl_slist_append(default_headers, "If:");
1286        default_headers = curl_slist_append(default_headers,
1287                                            "Pragma: no-cache");
1288
1289        /* Verify DAV compliance/lock support */
1290        if (!locking_available()) {
1291                fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
1292                rc = 1;
1293                goto cleanup;
1294        }
1295
1296        /* Process each refspec */
1297        for (i = 0; i < nr_refspec; i++) {
1298                char *ep;
1299                force_this = 0;
1300                do_remote_update = 0;
1301                new_branch = 0;
1302                local_ref = refspec[i];
1303                if (*local_ref == '+') {
1304                        force_this = 1;
1305                        local_ref++;
1306                }
1307                ep = strchr(local_ref, ':');
1308                if (ep) {
1309                        remote_ref = ep + 1;
1310                        *ep = 0;
1311                }
1312                else
1313                        remote_ref = local_ref;
1314
1315                /* Lock remote branch ref */
1316                if (remote_path)
1317                        free(remote_path);
1318                remote_path = xmalloc(strlen(remote_ref) + 12);
1319                sprintf(remote_path, "refs/heads/%s", remote_ref);
1320                remote_lock = lock_remote(remote_path, LOCK_TIME);
1321                if (remote_lock == NULL) {
1322                        fprintf(stderr, "Unable to lock remote branch %s\n",
1323                                remote_ref);
1324                        rc = 1;
1325                        continue;
1326                }
1327
1328                /* Resolve local and remote refs */
1329                if (fetch_ref(remote_ref, remote_sha1) != 0) {
1330                        fprintf(stderr,
1331                                "Remote branch %s does not exist on %s\n",
1332                                remote_ref, remote->url);
1333                        new_branch = 1;
1334                }
1335                if (get_sha1(local_ref, local_sha1) != 0) {
1336                        fprintf(stderr, "Error resolving local branch %s\n",
1337                                local_ref);
1338                        rc = 1;
1339                        goto unlock;
1340                }
1341        
1342                /* Find relationship between local and remote */
1343                local_object = parse_object(local_sha1);
1344                if (!local_object) {
1345                        fprintf(stderr, "Unable to parse local object %s\n",
1346                                sha1_to_hex(local_sha1));
1347                        rc = 1;
1348                        goto unlock;
1349                } else if (new_branch) {
1350                        do_remote_update = 1;
1351                } else {
1352                        if (!memcmp(local_sha1, remote_sha1, 20)) {
1353                                fprintf(stderr,
1354                                        "* %s: same as branch '%s' of %s\n",
1355                                        local_ref, remote_ref, remote->url);
1356                        } else if (is_ancestor(remote_sha1,
1357                                               (struct commit *)local_object)) {
1358                                fprintf(stderr,
1359                                        "Remote %s will fast-forward to local %s\n",
1360                                        remote_ref, local_ref);
1361                                do_remote_update = 1;
1362                        } else if (force_all || force_this) {
1363                                fprintf(stderr,
1364                                        "* %s on %s does not fast forward to local branch '%s', overwriting\n",
1365                                        remote_ref, remote->url, local_ref);
1366                                do_remote_update = 1;
1367                        } else {
1368                                fprintf(stderr,
1369                                        "* %s on %s does not fast forward to local branch '%s'\n",
1370                                        remote_ref, remote->url, local_ref);
1371                                rc = 1;
1372                                goto unlock;
1373                        }
1374                }
1375
1376                /* Generate and check list of required objects */
1377                pushing = 0;
1378                if (do_remote_update || push_all)
1379                        fetch_indices();
1380                get_delta(push_all ? NULL : remote_sha1,
1381                          local_object, remote_lock);
1382                finish_all_active_slots();
1383
1384                /* Push missing objects to remote, this would be a
1385                   convenient time to pack them first if appropriate. */
1386                pushing = 1;
1387                fill_active_slots();
1388                finish_all_active_slots();
1389
1390                /* Update the remote branch if all went well */
1391                if (do_remote_update) {
1392                        if (!aborted && update_remote(local_sha1,
1393                                                      remote_lock)) {
1394                                fprintf(stderr, "%s remote branch %s\n",
1395                                        new_branch ? "Created" : "Updated",
1396                                        remote_ref);
1397                        } else {
1398                                fprintf(stderr,
1399                                        "Unable to %s remote branch %s\n",
1400                                        new_branch ? "create" : "update",
1401                                        remote_ref);
1402                                rc = 1;
1403                                goto unlock;
1404                        }
1405                }
1406
1407        unlock:
1408                unlock_remote(remote_lock);
1409                free(remote_path);
1410        }
1411
1412 cleanup:
1413        free(remote);
1414
1415        curl_slist_free_all(no_pragma_header);
1416        curl_slist_free_all(default_headers);
1417
1418        http_cleanup();
1419
1420        request = request_queue_head;
1421        while (request != NULL) {
1422                next_request = request->next;
1423                release_request(request);
1424                request = next_request;
1425        }
1426
1427        return rc;
1428}