Andrew's git - gitweb.git/blob

256326afb5c720bf7451e227c838701d4fd75d0c
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "sideband.h"
  10
  11static struct remote *remote;
  12static const char *url;
  13static struct walker *walker;
  14
  15struct options {
  16        int verbosity;
  17        unsigned long depth;
  18        unsigned progress : 1,
  19                followtags : 1,
  20                dry_run : 1,
  21                thin : 1;
  22};
  23static struct options options;
  24
  25static void init_walker(void)
  26{
  27        if (!walker)
  28                walker = get_http_walker(url, remote);
  29}
  30
  31static int set_option(const char *name, const char *value)
  32{
  33        if (!strcmp(name, "verbosity")) {
  34                char *end;
  35                int v = strtol(value, &end, 10);
  36                if (value == end || *end)
  37                        return -1;
  38                options.verbosity = v;
  39                return 0;
  40        }
  41        else if (!strcmp(name, "progress")) {
  42                if (!strcmp(value, "true"))
  43                        options.progress = 1;
  44                else if (!strcmp(value, "false"))
  45                        options.progress = 0;
  46                else
  47                        return -1;
  48                return 0;
  49        }
  50        else if (!strcmp(name, "depth")) {
  51                char *end;
  52                unsigned long v = strtoul(value, &end, 10);
  53                if (value == end || *end)
  54                        return -1;
  55                options.depth = v;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "followtags")) {
  59                if (!strcmp(value, "true"))
  60                        options.followtags = 1;
  61                else if (!strcmp(value, "false"))
  62                        options.followtags = 0;
  63                else
  64                        return -1;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "dry-run")) {
  68                if (!strcmp(value, "true"))
  69                        options.dry_run = 1;
  70                else if (!strcmp(value, "false"))
  71                        options.dry_run = 0;
  72                else
  73                        return -1;
  74                return 0;
  75        }
  76        else {
  77                return 1 /* unsupported */;
  78        }
  79}
  80
  81struct discovery {
  82        const char *service;
  83        char *buf_alloc;
  84        char *buf;
  85        size_t len;
  86        unsigned proto_git : 1;
  87};
  88static struct discovery *last_discovery;
  89
  90static void free_discovery(struct discovery *d)
  91{
  92        if (d) {
  93                if (d == last_discovery)
  94                        last_discovery = NULL;
  95                free(d->buf_alloc);
  96                free(d);
  97        }
  98}
  99
 100static struct discovery* discover_refs(const char *service)
 101{
 102        struct strbuf buffer = STRBUF_INIT;
 103        struct discovery *last = last_discovery;
 104        char *refs_url;
 105        int http_ret, is_http = 0, proto_git_candidate = 1;
 106
 107        if (last && !strcmp(service, last->service))
 108                return last;
 109        free_discovery(last);
 110
 111        strbuf_addf(&buffer, "%s/info/refs", url);
 112        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                is_http = 1;
 114                if (!strchr(url, '?'))
 115                        strbuf_addch(&buffer, '?');
 116                else
 117                        strbuf_addch(&buffer, '&');
 118                strbuf_addf(&buffer, "service=%s", service);
 119        }
 120        refs_url = strbuf_detach(&buffer, NULL);
 121
 122        init_walker();
 123        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124
 125        /* try again with "plain" url (no ? or & appended) */
 126        if (http_ret != HTTP_OK) {
 127                free(refs_url);
 128                strbuf_reset(&buffer);
 129
 130                proto_git_candidate = 0;
 131                strbuf_addf(&buffer, "%s/info/refs", url);
 132                refs_url = strbuf_detach(&buffer, NULL);
 133
 134                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 135        }
 136
 137        switch (http_ret) {
 138        case HTTP_OK:
 139                break;
 140        case HTTP_MISSING_TARGET:
 141                die("%s not found: did you run git update-server-info on the"
 142                    " server?", refs_url);
 143        default:
 144                http_error(refs_url, http_ret);
 145                die("HTTP request failed");
 146        }
 147
 148        last= xcalloc(1, sizeof(*last_discovery));
 149        last->service = service;
 150        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 151        last->buf = last->buf_alloc;
 152
 153        if (is_http && proto_git_candidate
 154                && 5 <= last->len && last->buf[4] == '#') {
 155                /* smart HTTP response; validate that the service
 156                 * pkt-line matches our request.
 157                 */
 158                struct strbuf exp = STRBUF_INIT;
 159
 160                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 161                        die("%s has invalid packet header", refs_url);
 162                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 163                        strbuf_setlen(&buffer, buffer.len - 1);
 164
 165                strbuf_addf(&exp, "# service=%s", service);
 166                if (strbuf_cmp(&exp, &buffer))
 167                        die("invalid server response; got '%s'", buffer.buf);
 168                strbuf_release(&exp);
 169
 170                /* The header can include additional metadata lines, up
 171                 * until a packet flush marker.  Ignore these now, but
 172                 * in the future we might start to scan them.
 173                 */
 174                strbuf_reset(&buffer);
 175                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 176                        strbuf_reset(&buffer);
 177
 178                last->proto_git = 1;
 179        }
 180
 181        free(refs_url);
 182        strbuf_release(&buffer);
 183        last_discovery = last;
 184        return last;
 185}
 186
 187static int write_discovery(int in, int out, void *data)
 188{
 189        struct discovery *heads = data;
 190        int err = 0;
 191        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 192                err = 1;
 193        close(out);
 194        return err;
 195}
 196
 197static struct ref *parse_git_refs(struct discovery *heads)
 198{
 199        struct ref *list = NULL;
 200        struct async async;
 201
 202        memset(&async, 0, sizeof(async));
 203        async.proc = write_discovery;
 204        async.data = heads;
 205        async.out = -1;
 206
 207        if (start_async(&async))
 208                die("cannot start thread to parse advertised refs");
 209        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 210        close(async.out);
 211        if (finish_async(&async))
 212                die("ref parsing thread failed");
 213        return list;
 214}
 215
 216static struct ref *parse_info_refs(struct discovery *heads)
 217{
 218        char *data, *start, *mid;
 219        char *ref_name;
 220        int i = 0;
 221
 222        struct ref *refs = NULL;
 223        struct ref *ref = NULL;
 224        struct ref *last_ref = NULL;
 225
 226        data = heads->buf;
 227        start = NULL;
 228        mid = data;
 229        while (i < heads->len) {
 230                if (!start) {
 231                        start = &data[i];
 232                }
 233                if (data[i] == '\t')
 234                        mid = &data[i];
 235                if (data[i] == '\n') {
 236                        data[i] = 0;
 237                        ref_name = mid + 1;
 238                        ref = xmalloc(sizeof(struct ref) +
 239                                      strlen(ref_name) + 1);
 240                        memset(ref, 0, sizeof(struct ref));
 241                        strcpy(ref->name, ref_name);
 242                        get_sha1_hex(start, ref->old_sha1);
 243                        if (!refs)
 244                                refs = ref;
 245                        if (last_ref)
 246                                last_ref->next = ref;
 247                        last_ref = ref;
 248                        start = NULL;
 249                }
 250                i++;
 251        }
 252
 253        init_walker();
 254        ref = alloc_ref("HEAD");
 255        if (!walker->fetch_ref(walker, ref) &&
 256            !resolve_remote_symref(ref, refs)) {
 257                ref->next = refs;
 258                refs = ref;
 259        } else {
 260                free(ref);
 261        }
 262
 263        return refs;
 264}
 265
 266static struct ref *get_refs(int for_push)
 267{
 268        struct discovery *heads;
 269
 270        if (for_push)
 271                heads = discover_refs("git-receive-pack");
 272        else
 273                heads = discover_refs("git-upload-pack");
 274
 275        if (heads->proto_git)
 276                return parse_git_refs(heads);
 277        return parse_info_refs(heads);
 278}
 279
 280static void output_refs(struct ref *refs)
 281{
 282        struct ref *posn;
 283        for (posn = refs; posn; posn = posn->next) {
 284                if (posn->symref)
 285                        printf("@%s %s\n", posn->symref, posn->name);
 286                else
 287                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 288        }
 289        printf("\n");
 290        fflush(stdout);
 291        free_refs(refs);
 292}
 293
 294struct rpc_state {
 295        const char *service_name;
 296        const char **argv;
 297        char *service_url;
 298        char *hdr_content_type;
 299        char *hdr_accept;
 300        char *buf;
 301        size_t alloc;
 302        size_t len;
 303        size_t pos;
 304        int in;
 305        int out;
 306        struct strbuf result;
 307        unsigned gzip_request : 1;
 308        unsigned initial_buffer : 1;
 309};
 310
 311static size_t rpc_out(void *ptr, size_t eltsize,
 312                size_t nmemb, void *buffer_)
 313{
 314        size_t max = eltsize * nmemb;
 315        struct rpc_state *rpc = buffer_;
 316        size_t avail = rpc->len - rpc->pos;
 317
 318        if (!avail) {
 319                rpc->initial_buffer = 0;
 320                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 321                if (!avail)
 322                        return 0;
 323                rpc->pos = 0;
 324                rpc->len = avail;
 325        }
 326
 327        if (max < avail)
 328                avail = max;
 329        memcpy(ptr, rpc->buf + rpc->pos, avail);
 330        rpc->pos += avail;
 331        return avail;
 332}
 333
 334#ifndef NO_CURL_IOCTL
 335static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 336{
 337        struct rpc_state *rpc = clientp;
 338
 339        switch (cmd) {
 340        case CURLIOCMD_NOP:
 341                return CURLIOE_OK;
 342
 343        case CURLIOCMD_RESTARTREAD:
 344                if (rpc->initial_buffer) {
 345                        rpc->pos = 0;
 346                        return CURLIOE_OK;
 347                }
 348                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 349                return CURLIOE_FAILRESTART;
 350
 351        default:
 352                return CURLIOE_UNKNOWNCMD;
 353        }
 354}
 355#endif
 356
 357static size_t rpc_in(const void *ptr, size_t eltsize,
 358                size_t nmemb, void *buffer_)
 359{
 360        size_t size = eltsize * nmemb;
 361        struct rpc_state *rpc = buffer_;
 362        write_or_die(rpc->in, ptr, size);
 363        return size;
 364}
 365
 366static int run_slot(struct active_request_slot *slot)
 367{
 368        int err = 0;
 369        struct slot_results results;
 370
 371        slot->results = &results;
 372        slot->curl_result = curl_easy_perform(slot->curl);
 373        finish_active_slot(slot);
 374
 375        if (results.curl_result != CURLE_OK) {
 376                err |= error("RPC failed; result=%d, HTTP code = %ld",
 377                        results.curl_result, results.http_code);
 378        }
 379
 380        return err;
 381}
 382
 383static int probe_rpc(struct rpc_state *rpc)
 384{
 385        struct active_request_slot *slot;
 386        struct curl_slist *headers = NULL;
 387        struct strbuf buf = STRBUF_INIT;
 388        int err;
 389
 390        slot = get_active_slot();
 391
 392        headers = curl_slist_append(headers, rpc->hdr_content_type);
 393        headers = curl_slist_append(headers, rpc->hdr_accept);
 394
 395        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 396        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 397        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 398        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 399        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 400        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 401        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 402        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 403        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 404
 405        err = run_slot(slot);
 406
 407        curl_slist_free_all(headers);
 408        strbuf_release(&buf);
 409        return err;
 410}
 411
 412static int post_rpc(struct rpc_state *rpc)
 413{
 414        struct active_request_slot *slot;
 415        struct curl_slist *headers = NULL;
 416        int use_gzip = rpc->gzip_request;
 417        char *gzip_body = NULL;
 418        int err, large_request = 0;
 419
 420        /* Try to load the entire request, if we can fit it into the
 421         * allocated buffer space we can use HTTP/1.0 and avoid the
 422         * chunked encoding mess.
 423         */
 424        while (1) {
 425                size_t left = rpc->alloc - rpc->len;
 426                char *buf = rpc->buf + rpc->len;
 427                int n;
 428
 429                if (left < LARGE_PACKET_MAX) {
 430                        large_request = 1;
 431                        use_gzip = 0;
 432                        break;
 433                }
 434
 435                n = packet_read_line(rpc->out, buf, left);
 436                if (!n)
 437                        break;
 438                rpc->len += n;
 439        }
 440
 441        if (large_request) {
 442                err = probe_rpc(rpc);
 443                if (err)
 444                        return err;
 445        }
 446
 447        slot = get_active_slot();
 448
 449        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 450        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 451        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 452        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 453
 454        headers = curl_slist_append(headers, rpc->hdr_content_type);
 455        headers = curl_slist_append(headers, rpc->hdr_accept);
 456
 457        if (large_request) {
 458                /* The request body is large and the size cannot be predicted.
 459                 * We must use chunked encoding to send it.
 460                 */
 461                headers = curl_slist_append(headers, "Expect:");
 462                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 463                rpc->initial_buffer = 1;
 464                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 465                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 466#ifndef NO_CURL_IOCTL
 467                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 468                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 469#endif
 470                if (options.verbosity > 1) {
 471                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 472                        fflush(stderr);
 473                }
 474
 475        } else if (use_gzip && 1024 < rpc->len) {
 476                /* The client backend isn't giving us compressed data so
 477                 * we can try to deflate it ourselves, this may save on.
 478                 * the transfer time.
 479                 */
 480                size_t size;
 481                z_stream stream;
 482                int ret;
 483
 484                memset(&stream, 0, sizeof(stream));
 485                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 486                                Z_DEFLATED, (15 + 16),
 487                                8, Z_DEFAULT_STRATEGY);
 488                if (ret != Z_OK)
 489                        die("cannot deflate request; zlib init error %d", ret);
 490                size = deflateBound(&stream, rpc->len);
 491                gzip_body = xmalloc(size);
 492
 493                stream.next_in = (unsigned char *)rpc->buf;
 494                stream.avail_in = rpc->len;
 495                stream.next_out = (unsigned char *)gzip_body;
 496                stream.avail_out = size;
 497
 498                ret = deflate(&stream, Z_FINISH);
 499                if (ret != Z_STREAM_END)
 500                        die("cannot deflate request; zlib deflate error %d", ret);
 501
 502                ret = deflateEnd(&stream);
 503                if (ret != Z_OK)
 504                        die("cannot deflate request; zlib end error %d", ret);
 505
 506                size = stream.total_out;
 507
 508                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 509                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 510                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 511
 512                if (options.verbosity > 1) {
 513                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 514                                rpc->service_name,
 515                                (unsigned long)rpc->len, (unsigned long)size);
 516                        fflush(stderr);
 517                }
 518        } else {
 519                /* We know the complete request size in advance, use the
 520                 * more normal Content-Length approach.
 521                 */
 522                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 523                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 524                if (options.verbosity > 1) {
 525                        fprintf(stderr, "POST %s (%lu bytes)\n",
 526                                rpc->service_name, (unsigned long)rpc->len);
 527                        fflush(stderr);
 528                }
 529        }
 530
 531        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 532        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 533        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 534
 535        err = run_slot(slot);
 536
 537        curl_slist_free_all(headers);
 538        free(gzip_body);
 539        return err;
 540}
 541
 542static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 543{
 544        const char *svc = rpc->service_name;
 545        struct strbuf buf = STRBUF_INIT;
 546        struct child_process client;
 547        int err = 0;
 548
 549        init_walker();
 550        memset(&client, 0, sizeof(client));
 551        client.in = -1;
 552        client.out = -1;
 553        client.git_cmd = 1;
 554        client.argv = rpc->argv;
 555        if (start_command(&client))
 556                exit(1);
 557        if (heads)
 558                write_or_die(client.in, heads->buf, heads->len);
 559
 560        rpc->alloc = http_post_buffer;
 561        rpc->buf = xmalloc(rpc->alloc);
 562        rpc->in = client.in;
 563        rpc->out = client.out;
 564        strbuf_init(&rpc->result, 0);
 565
 566        strbuf_addf(&buf, "%s/%s", url, svc);
 567        rpc->service_url = strbuf_detach(&buf, NULL);
 568
 569        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 570        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 571
 572        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 573        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 574
 575        while (!err) {
 576                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 577                if (!n)
 578                        break;
 579                rpc->pos = 0;
 580                rpc->len = n;
 581                err |= post_rpc(rpc);
 582        }
 583        strbuf_read(&rpc->result, client.out, 0);
 584
 585        close(client.in);
 586        close(client.out);
 587        client.in = -1;
 588        client.out = -1;
 589
 590        err |= finish_command(&client);
 591        free(rpc->service_url);
 592        free(rpc->hdr_content_type);
 593        free(rpc->hdr_accept);
 594        free(rpc->buf);
 595        strbuf_release(&buf);
 596        return err;
 597}
 598
 599static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 600{
 601        char **targets = xmalloc(nr_heads * sizeof(char*));
 602        int ret, i;
 603
 604        if (options.depth)
 605                die("dumb http transport does not support --depth");
 606        for (i = 0; i < nr_heads; i++)
 607                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 608
 609        init_walker();
 610        walker->get_all = 1;
 611        walker->get_tree = 1;
 612        walker->get_history = 1;
 613        walker->get_verbosely = options.verbosity >= 3;
 614        walker->get_recover = 0;
 615        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 616
 617        for (i = 0; i < nr_heads; i++)
 618                free(targets[i]);
 619        free(targets);
 620
 621        return ret ? error("Fetch failed.") : 0;
 622}
 623
 624static int fetch_git(struct discovery *heads,
 625        int nr_heads, struct ref **to_fetch)
 626{
 627        struct rpc_state rpc;
 628        char *depth_arg = NULL;
 629        const char **argv;
 630        int argc = 0, i, err;
 631
 632        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 633        argv[argc++] = "fetch-pack";
 634        argv[argc++] = "--stateless-rpc";
 635        argv[argc++] = "--lock-pack";
 636        if (options.followtags)
 637                argv[argc++] = "--include-tag";
 638        if (options.thin)
 639                argv[argc++] = "--thin";
 640        if (options.verbosity >= 3) {
 641                argv[argc++] = "-v";
 642                argv[argc++] = "-v";
 643        }
 644        if (!options.progress)
 645                argv[argc++] = "--no-progress";
 646        if (options.depth) {
 647                struct strbuf buf = STRBUF_INIT;
 648                strbuf_addf(&buf, "--depth=%lu", options.depth);
 649                depth_arg = strbuf_detach(&buf, NULL);
 650                argv[argc++] = depth_arg;
 651        }
 652        argv[argc++] = url;
 653        for (i = 0; i < nr_heads; i++) {
 654                struct ref *ref = to_fetch[i];
 655                if (!ref->name || !*ref->name)
 656                        die("cannot fetch by sha1 over smart http");
 657                argv[argc++] = ref->name;
 658        }
 659        argv[argc++] = NULL;
 660
 661        memset(&rpc, 0, sizeof(rpc));
 662        rpc.service_name = "git-upload-pack",
 663        rpc.argv = argv;
 664        rpc.gzip_request = 1;
 665
 666        err = rpc_service(&rpc, heads);
 667        if (rpc.result.len)
 668                safe_write(1, rpc.result.buf, rpc.result.len);
 669        strbuf_release(&rpc.result);
 670        free(argv);
 671        free(depth_arg);
 672        return err;
 673}
 674
 675static int fetch(int nr_heads, struct ref **to_fetch)
 676{
 677        struct discovery *d = discover_refs("git-upload-pack");
 678        if (d->proto_git)
 679                return fetch_git(d, nr_heads, to_fetch);
 680        else
 681                return fetch_dumb(nr_heads, to_fetch);
 682}
 683
 684static void parse_fetch(struct strbuf *buf)
 685{
 686        struct ref **to_fetch = NULL;
 687        struct ref *list_head = NULL;
 688        struct ref **list = &list_head;
 689        int alloc_heads = 0, nr_heads = 0;
 690
 691        do {
 692                if (!prefixcmp(buf->buf, "fetch ")) {
 693                        char *p = buf->buf + strlen("fetch ");
 694                        char *name;
 695                        struct ref *ref;
 696                        unsigned char old_sha1[20];
 697
 698                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 699                                die("protocol error: expected sha/ref, got %s'", p);
 700                        if (p[40] == ' ')
 701                                name = p + 41;
 702                        else if (!p[40])
 703                                name = "";
 704                        else
 705                                die("protocol error: expected sha/ref, got %s'", p);
 706
 707                        ref = alloc_ref(name);
 708                        hashcpy(ref->old_sha1, old_sha1);
 709
 710                        *list = ref;
 711                        list = &ref->next;
 712
 713                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 714                        to_fetch[nr_heads++] = ref;
 715                }
 716                else
 717                        die("http transport does not support %s", buf->buf);
 718
 719                strbuf_reset(buf);
 720                if (strbuf_getline(buf, stdin, '\n') == EOF)
 721                        return;
 722                if (!*buf->buf)
 723                        break;
 724        } while (1);
 725
 726        if (fetch(nr_heads, to_fetch))
 727                exit(128); /* error already reported */
 728        free_refs(list_head);
 729        free(to_fetch);
 730
 731        printf("\n");
 732        fflush(stdout);
 733        strbuf_reset(buf);
 734}
 735
 736static int push_dav(int nr_spec, char **specs)
 737{
 738        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 739        int argc = 0, i;
 740
 741        argv[argc++] = "http-push";
 742        argv[argc++] = "--helper-status";
 743        if (options.dry_run)
 744                argv[argc++] = "--dry-run";
 745        if (options.verbosity > 1)
 746                argv[argc++] = "--verbose";
 747        argv[argc++] = url;
 748        for (i = 0; i < nr_spec; i++)
 749                argv[argc++] = specs[i];
 750        argv[argc++] = NULL;
 751
 752        if (run_command_v_opt(argv, RUN_GIT_CMD))
 753                die("git-%s failed", argv[0]);
 754        free(argv);
 755        return 0;
 756}
 757
 758static int push_git(struct discovery *heads, int nr_spec, char **specs)
 759{
 760        struct rpc_state rpc;
 761        const char **argv;
 762        int argc = 0, i, err;
 763
 764        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 765        argv[argc++] = "send-pack";
 766        argv[argc++] = "--stateless-rpc";
 767        argv[argc++] = "--helper-status";
 768        if (options.thin)
 769                argv[argc++] = "--thin";
 770        if (options.dry_run)
 771                argv[argc++] = "--dry-run";
 772        if (options.verbosity > 1)
 773                argv[argc++] = "--verbose";
 774        argv[argc++] = url;
 775        for (i = 0; i < nr_spec; i++)
 776                argv[argc++] = specs[i];
 777        argv[argc++] = NULL;
 778
 779        memset(&rpc, 0, sizeof(rpc));
 780        rpc.service_name = "git-receive-pack",
 781        rpc.argv = argv;
 782
 783        err = rpc_service(&rpc, heads);
 784        if (rpc.result.len)
 785                safe_write(1, rpc.result.buf, rpc.result.len);
 786        strbuf_release(&rpc.result);
 787        free(argv);
 788        return err;
 789}
 790
 791static int push(int nr_spec, char **specs)
 792{
 793        struct discovery *heads = discover_refs("git-receive-pack");
 794        int ret;
 795
 796        if (heads->proto_git)
 797                ret = push_git(heads, nr_spec, specs);
 798        else
 799                ret = push_dav(nr_spec, specs);
 800        free_discovery(heads);
 801        return ret;
 802}
 803
 804static void parse_push(struct strbuf *buf)
 805{
 806        char **specs = NULL;
 807        int alloc_spec = 0, nr_spec = 0, i;
 808
 809        do {
 810                if (!prefixcmp(buf->buf, "push ")) {
 811                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 812                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 813                }
 814                else
 815                        die("http transport does not support %s", buf->buf);
 816
 817                strbuf_reset(buf);
 818                if (strbuf_getline(buf, stdin, '\n') == EOF)
 819                        return;
 820                if (!*buf->buf)
 821                        break;
 822        } while (1);
 823
 824        if (push(nr_spec, specs))
 825                exit(128); /* error already reported */
 826        for (i = 0; i < nr_spec; i++)
 827                free(specs[i]);
 828        free(specs);
 829
 830        printf("\n");
 831        fflush(stdout);
 832}
 833
 834int main(int argc, const char **argv)
 835{
 836        struct strbuf buf = STRBUF_INIT;
 837        int nongit;
 838
 839        git_extract_argv0_path(argv[0]);
 840        setup_git_directory_gently(&nongit);
 841        if (argc < 2) {
 842                fprintf(stderr, "Remote needed\n");
 843                return 1;
 844        }
 845
 846        options.verbosity = 1;
 847        options.progress = !!isatty(2);
 848        options.thin = 1;
 849
 850        remote = remote_get(argv[1]);
 851
 852        if (argc > 2) {
 853                url = argv[2];
 854        } else {
 855                url = remote->url[0];
 856        }
 857
 858        do {
 859                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 860                        break;
 861                if (!prefixcmp(buf.buf, "fetch ")) {
 862                        if (nongit)
 863                                die("Fetch attempted without a local repo");
 864                        parse_fetch(&buf);
 865
 866                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 867                        int for_push = !!strstr(buf.buf + 4, "for-push");
 868                        output_refs(get_refs(for_push));
 869
 870                } else if (!prefixcmp(buf.buf, "push ")) {
 871                        parse_push(&buf);
 872
 873                } else if (!prefixcmp(buf.buf, "option ")) {
 874                        char *name = buf.buf + strlen("option ");
 875                        char *value = strchr(name, ' ');
 876                        int result;
 877
 878                        if (value)
 879                                *value++ = '\0';
 880                        else
 881                                value = "true";
 882
 883                        result = set_option(name, value);
 884                        if (!result)
 885                                printf("ok\n");
 886                        else if (result < 0)
 887                                printf("error invalid value\n");
 888                        else
 889                                printf("unsupported\n");
 890                        fflush(stdout);
 891
 892                } else if (!strcmp(buf.buf, "capabilities")) {
 893                        printf("fetch\n");
 894                        printf("option\n");
 895                        printf("push\n");
 896                        printf("\n");
 897                        fflush(stdout);
 898                } else {
 899                        return 1;
 900                }
 901                strbuf_reset(&buf);
 902        } while (1);
 903        return 0;
 904}