Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit push.default doc: explain simple after upstream (f4d80d2)
   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; /* always ends with a trailing slash */
  13
  14struct options {
  15        int verbosity;
  16        unsigned long depth;
  17        unsigned progress : 1,
  18                followtags : 1,
  19                dry_run : 1,
  20                thin : 1;
  21};
  22static struct options options;
  23
  24static int set_option(const char *name, const char *value)
  25{
  26        if (!strcmp(name, "verbosity")) {
  27                char *end;
  28                int v = strtol(value, &end, 10);
  29                if (value == end || *end)
  30                        return -1;
  31                options.verbosity = v;
  32                return 0;
  33        }
  34        else if (!strcmp(name, "progress")) {
  35                if (!strcmp(value, "true"))
  36                        options.progress = 1;
  37                else if (!strcmp(value, "false"))
  38                        options.progress = 0;
  39                else
  40                        return -1;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "depth")) {
  44                char *end;
  45                unsigned long v = strtoul(value, &end, 10);
  46                if (value == end || *end)
  47                        return -1;
  48                options.depth = v;
  49                return 0;
  50        }
  51        else if (!strcmp(name, "followtags")) {
  52                if (!strcmp(value, "true"))
  53                        options.followtags = 1;
  54                else if (!strcmp(value, "false"))
  55                        options.followtags = 0;
  56                else
  57                        return -1;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "dry-run")) {
  61                if (!strcmp(value, "true"))
  62                        options.dry_run = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.dry_run = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else {
  70                return 1 /* unsupported */;
  71        }
  72}
  73
  74struct discovery {
  75        const char *service;
  76        char *buf_alloc;
  77        char *buf;
  78        size_t len;
  79        unsigned proto_git : 1;
  80};
  81static struct discovery *last_discovery;
  82
  83static void free_discovery(struct discovery *d)
  84{
  85        if (d) {
  86                if (d == last_discovery)
  87                        last_discovery = NULL;
  88                free(d->buf_alloc);
  89                free(d);
  90        }
  91}
  92
  93static struct discovery* discover_refs(const char *service)
  94{
  95        struct strbuf buffer = STRBUF_INIT;
  96        struct discovery *last = last_discovery;
  97        char *refs_url;
  98        int http_ret, is_http = 0, proto_git_candidate = 1;
  99
 100        if (last && !strcmp(service, last->service))
 101                return last;
 102        free_discovery(last);
 103
 104        strbuf_addf(&buffer, "%sinfo/refs", url);
 105        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 106                is_http = 1;
 107                if (!strchr(url, '?'))
 108                        strbuf_addch(&buffer, '?');
 109                else
 110                        strbuf_addch(&buffer, '&');
 111                strbuf_addf(&buffer, "service=%s", service);
 112        }
 113        refs_url = strbuf_detach(&buffer, NULL);
 114
 115        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 116
 117        /* try again with "plain" url (no ? or & appended) */
 118        if (http_ret != HTTP_OK && http_ret != HTTP_NOAUTH) {
 119                free(refs_url);
 120                strbuf_reset(&buffer);
 121
 122                proto_git_candidate = 0;
 123                strbuf_addf(&buffer, "%sinfo/refs", url);
 124                refs_url = strbuf_detach(&buffer, NULL);
 125
 126                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 127        }
 128
 129        switch (http_ret) {
 130        case HTTP_OK:
 131                break;
 132        case HTTP_MISSING_TARGET:
 133                die("%s not found: did you run git update-server-info on the"
 134                    " server?", refs_url);
 135        case HTTP_NOAUTH:
 136                die("Authentication failed");
 137        default:
 138                http_error(refs_url, http_ret);
 139                die("HTTP request failed");
 140        }
 141
 142        last= xcalloc(1, sizeof(*last_discovery));
 143        last->service = service;
 144        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 145        last->buf = last->buf_alloc;
 146
 147        if (is_http && proto_git_candidate
 148                && 5 <= last->len && last->buf[4] == '#') {
 149                /* smart HTTP response; validate that the service
 150                 * pkt-line matches our request.
 151                 */
 152                struct strbuf exp = STRBUF_INIT;
 153
 154                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 155                        die("%s has invalid packet header", refs_url);
 156                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 157                        strbuf_setlen(&buffer, buffer.len - 1);
 158
 159                strbuf_addf(&exp, "# service=%s", service);
 160                if (strbuf_cmp(&exp, &buffer))
 161                        die("invalid server response; got '%s'", buffer.buf);
 162                strbuf_release(&exp);
 163
 164                /* The header can include additional metadata lines, up
 165                 * until a packet flush marker.  Ignore these now, but
 166                 * in the future we might start to scan them.
 167                 */
 168                strbuf_reset(&buffer);
 169                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 170                        strbuf_reset(&buffer);
 171
 172                last->proto_git = 1;
 173        }
 174
 175        free(refs_url);
 176        strbuf_release(&buffer);
 177        last_discovery = last;
 178        return last;
 179}
 180
 181static int write_discovery(int in, int out, void *data)
 182{
 183        struct discovery *heads = data;
 184        int err = 0;
 185        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 186                err = 1;
 187        close(out);
 188        return err;
 189}
 190
 191static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 192{
 193        struct ref *list = NULL;
 194        struct async async;
 195
 196        memset(&async, 0, sizeof(async));
 197        async.proc = write_discovery;
 198        async.data = heads;
 199        async.out = -1;
 200
 201        if (start_async(&async))
 202                die("cannot start thread to parse advertised refs");
 203        get_remote_heads(async.out, &list,
 204                        for_push ? REF_NORMAL : 0, NULL);
 205        close(async.out);
 206        if (finish_async(&async))
 207                die("ref parsing thread failed");
 208        return list;
 209}
 210
 211static struct ref *parse_info_refs(struct discovery *heads)
 212{
 213        char *data, *start, *mid;
 214        char *ref_name;
 215        int i = 0;
 216
 217        struct ref *refs = NULL;
 218        struct ref *ref = NULL;
 219        struct ref *last_ref = NULL;
 220
 221        data = heads->buf;
 222        start = NULL;
 223        mid = data;
 224        while (i < heads->len) {
 225                if (!start) {
 226                        start = &data[i];
 227                }
 228                if (data[i] == '\t')
 229                        mid = &data[i];
 230                if (data[i] == '\n') {
 231                        if (mid - start != 40)
 232                                die("%sinfo/refs not valid: is this a git repository?", url);
 233                        data[i] = 0;
 234                        ref_name = mid + 1;
 235                        ref = xmalloc(sizeof(struct ref) +
 236                                      strlen(ref_name) + 1);
 237                        memset(ref, 0, sizeof(struct ref));
 238                        strcpy(ref->name, ref_name);
 239                        get_sha1_hex(start, ref->old_sha1);
 240                        if (!refs)
 241                                refs = ref;
 242                        if (last_ref)
 243                                last_ref->next = ref;
 244                        last_ref = ref;
 245                        start = NULL;
 246                }
 247                i++;
 248        }
 249
 250        ref = alloc_ref("HEAD");
 251        if (!http_fetch_ref(url, ref) &&
 252            !resolve_remote_symref(ref, refs)) {
 253                ref->next = refs;
 254                refs = ref;
 255        } else {
 256                free(ref);
 257        }
 258
 259        return refs;
 260}
 261
 262static struct ref *get_refs(int for_push)
 263{
 264        struct discovery *heads;
 265
 266        if (for_push)
 267                heads = discover_refs("git-receive-pack");
 268        else
 269                heads = discover_refs("git-upload-pack");
 270
 271        if (heads->proto_git)
 272                return parse_git_refs(heads, for_push);
 273        return parse_info_refs(heads);
 274}
 275
 276static void output_refs(struct ref *refs)
 277{
 278        struct ref *posn;
 279        for (posn = refs; posn; posn = posn->next) {
 280                if (posn->symref)
 281                        printf("@%s %s\n", posn->symref, posn->name);
 282                else
 283                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 284        }
 285        printf("\n");
 286        fflush(stdout);
 287        free_refs(refs);
 288}
 289
 290struct rpc_state {
 291        const char *service_name;
 292        const char **argv;
 293        char *service_url;
 294        char *hdr_content_type;
 295        char *hdr_accept;
 296        char *buf;
 297        size_t alloc;
 298        size_t len;
 299        size_t pos;
 300        int in;
 301        int out;
 302        struct strbuf result;
 303        unsigned gzip_request : 1;
 304        unsigned initial_buffer : 1;
 305};
 306
 307static size_t rpc_out(void *ptr, size_t eltsize,
 308                size_t nmemb, void *buffer_)
 309{
 310        size_t max = eltsize * nmemb;
 311        struct rpc_state *rpc = buffer_;
 312        size_t avail = rpc->len - rpc->pos;
 313
 314        if (!avail) {
 315                rpc->initial_buffer = 0;
 316                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 317                if (!avail)
 318                        return 0;
 319                rpc->pos = 0;
 320                rpc->len = avail;
 321        }
 322
 323        if (max < avail)
 324                avail = max;
 325        memcpy(ptr, rpc->buf + rpc->pos, avail);
 326        rpc->pos += avail;
 327        return avail;
 328}
 329
 330#ifndef NO_CURL_IOCTL
 331static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 332{
 333        struct rpc_state *rpc = clientp;
 334
 335        switch (cmd) {
 336        case CURLIOCMD_NOP:
 337                return CURLIOE_OK;
 338
 339        case CURLIOCMD_RESTARTREAD:
 340                if (rpc->initial_buffer) {
 341                        rpc->pos = 0;
 342                        return CURLIOE_OK;
 343                }
 344                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 345                return CURLIOE_FAILRESTART;
 346
 347        default:
 348                return CURLIOE_UNKNOWNCMD;
 349        }
 350}
 351#endif
 352
 353static size_t rpc_in(char *ptr, size_t eltsize,
 354                size_t nmemb, void *buffer_)
 355{
 356        size_t size = eltsize * nmemb;
 357        struct rpc_state *rpc = buffer_;
 358        write_or_die(rpc->in, ptr, size);
 359        return size;
 360}
 361
 362static int run_slot(struct active_request_slot *slot)
 363{
 364        int err = 0;
 365        struct slot_results results;
 366
 367        slot->results = &results;
 368        slot->curl_result = curl_easy_perform(slot->curl);
 369        finish_active_slot(slot);
 370
 371        if (results.curl_result != CURLE_OK) {
 372                err |= error("RPC failed; result=%d, HTTP code = %ld",
 373                        results.curl_result, results.http_code);
 374        }
 375
 376        return err;
 377}
 378
 379static int probe_rpc(struct rpc_state *rpc)
 380{
 381        struct active_request_slot *slot;
 382        struct curl_slist *headers = NULL;
 383        struct strbuf buf = STRBUF_INIT;
 384        int err;
 385
 386        slot = get_active_slot();
 387
 388        headers = curl_slist_append(headers, rpc->hdr_content_type);
 389        headers = curl_slist_append(headers, rpc->hdr_accept);
 390
 391        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 392        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 393        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 394        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 395        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 396        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 397        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 398        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 399        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 400
 401        err = run_slot(slot);
 402
 403        curl_slist_free_all(headers);
 404        strbuf_release(&buf);
 405        return err;
 406}
 407
 408static int post_rpc(struct rpc_state *rpc)
 409{
 410        struct active_request_slot *slot;
 411        struct curl_slist *headers = NULL;
 412        int use_gzip = rpc->gzip_request;
 413        char *gzip_body = NULL;
 414        int err, large_request = 0;
 415
 416        /* Try to load the entire request, if we can fit it into the
 417         * allocated buffer space we can use HTTP/1.0 and avoid the
 418         * chunked encoding mess.
 419         */
 420        while (1) {
 421                size_t left = rpc->alloc - rpc->len;
 422                char *buf = rpc->buf + rpc->len;
 423                int n;
 424
 425                if (left < LARGE_PACKET_MAX) {
 426                        large_request = 1;
 427                        use_gzip = 0;
 428                        break;
 429                }
 430
 431                n = packet_read_line(rpc->out, buf, left);
 432                if (!n)
 433                        break;
 434                rpc->len += n;
 435        }
 436
 437        if (large_request) {
 438                err = probe_rpc(rpc);
 439                if (err)
 440                        return err;
 441        }
 442
 443        slot = get_active_slot();
 444
 445        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 446        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 447        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 448        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 449
 450        headers = curl_slist_append(headers, rpc->hdr_content_type);
 451        headers = curl_slist_append(headers, rpc->hdr_accept);
 452        headers = curl_slist_append(headers, "Expect:");
 453
 454        if (large_request) {
 455                /* The request body is large and the size cannot be predicted.
 456                 * We must use chunked encoding to send it.
 457                 */
 458                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 459                rpc->initial_buffer = 1;
 460                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 461                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 462#ifndef NO_CURL_IOCTL
 463                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 464                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 465#endif
 466                if (options.verbosity > 1) {
 467                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 468                        fflush(stderr);
 469                }
 470
 471        } else if (use_gzip && 1024 < rpc->len) {
 472                /* The client backend isn't giving us compressed data so
 473                 * we can try to deflate it ourselves, this may save on.
 474                 * the transfer time.
 475                 */
 476                size_t size;
 477                git_zstream stream;
 478                int ret;
 479
 480                memset(&stream, 0, sizeof(stream));
 481                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 482                size = git_deflate_bound(&stream, rpc->len);
 483                gzip_body = xmalloc(size);
 484
 485                stream.next_in = (unsigned char *)rpc->buf;
 486                stream.avail_in = rpc->len;
 487                stream.next_out = (unsigned char *)gzip_body;
 488                stream.avail_out = size;
 489
 490                ret = git_deflate(&stream, Z_FINISH);
 491                if (ret != Z_STREAM_END)
 492                        die("cannot deflate request; zlib deflate error %d", ret);
 493
 494                ret = git_deflate_end_gently(&stream);
 495                if (ret != Z_OK)
 496                        die("cannot deflate request; zlib end error %d", ret);
 497
 498                size = stream.total_out;
 499
 500                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 501                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 502                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 503
 504                if (options.verbosity > 1) {
 505                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 506                                rpc->service_name,
 507                                (unsigned long)rpc->len, (unsigned long)size);
 508                        fflush(stderr);
 509                }
 510        } else {
 511                /* We know the complete request size in advance, use the
 512                 * more normal Content-Length approach.
 513                 */
 514                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 515                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 516                if (options.verbosity > 1) {
 517                        fprintf(stderr, "POST %s (%lu bytes)\n",
 518                                rpc->service_name, (unsigned long)rpc->len);
 519                        fflush(stderr);
 520                }
 521        }
 522
 523        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 524        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 525        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 526
 527        err = run_slot(slot);
 528
 529        curl_slist_free_all(headers);
 530        free(gzip_body);
 531        return err;
 532}
 533
 534static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 535{
 536        const char *svc = rpc->service_name;
 537        struct strbuf buf = STRBUF_INIT;
 538        struct child_process client;
 539        int err = 0;
 540
 541        memset(&client, 0, sizeof(client));
 542        client.in = -1;
 543        client.out = -1;
 544        client.git_cmd = 1;
 545        client.argv = rpc->argv;
 546        if (start_command(&client))
 547                exit(1);
 548        if (heads)
 549                write_or_die(client.in, heads->buf, heads->len);
 550
 551        rpc->alloc = http_post_buffer;
 552        rpc->buf = xmalloc(rpc->alloc);
 553        rpc->in = client.in;
 554        rpc->out = client.out;
 555        strbuf_init(&rpc->result, 0);
 556
 557        strbuf_addf(&buf, "%s%s", url, svc);
 558        rpc->service_url = strbuf_detach(&buf, NULL);
 559
 560        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 561        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 562
 563        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 564        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 565
 566        while (!err) {
 567                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 568                if (!n)
 569                        break;
 570                rpc->pos = 0;
 571                rpc->len = n;
 572                err |= post_rpc(rpc);
 573        }
 574
 575        close(client.in);
 576        client.in = -1;
 577        if (!err) {
 578                strbuf_read(&rpc->result, client.out, 0);
 579        } else {
 580                char buf[4096];
 581                for (;;)
 582                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 583                                break;
 584        }
 585
 586        close(client.out);
 587        client.out = -1;
 588
 589        err |= finish_command(&client);
 590        free(rpc->service_url);
 591        free(rpc->hdr_content_type);
 592        free(rpc->hdr_accept);
 593        free(rpc->buf);
 594        strbuf_release(&buf);
 595        return err;
 596}
 597
 598static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 599{
 600        struct walker *walker;
 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        walker = get_http_walker(url);
 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        walker_free(walker);
 617
 618        for (i = 0; i < nr_heads; i++)
 619                free(targets[i]);
 620        free(targets);
 621
 622        return ret ? error("Fetch failed.") : 0;
 623}
 624
 625static int fetch_git(struct discovery *heads,
 626        int nr_heads, struct ref **to_fetch)
 627{
 628        struct rpc_state rpc;
 629        char *depth_arg = NULL;
 630        const char **argv;
 631        int argc = 0, i, err;
 632
 633        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 634        argv[argc++] = "fetch-pack";
 635        argv[argc++] = "--stateless-rpc";
 636        argv[argc++] = "--lock-pack";
 637        if (options.followtags)
 638                argv[argc++] = "--include-tag";
 639        if (options.thin)
 640                argv[argc++] = "--thin";
 641        if (options.verbosity >= 3) {
 642                argv[argc++] = "-v";
 643                argv[argc++] = "-v";
 644        }
 645        if (!options.progress)
 646                argv[argc++] = "--no-progress";
 647        if (options.depth) {
 648                struct strbuf buf = STRBUF_INIT;
 649                strbuf_addf(&buf, "--depth=%lu", options.depth);
 650                depth_arg = strbuf_detach(&buf, NULL);
 651                argv[argc++] = depth_arg;
 652        }
 653        argv[argc++] = url;
 654        for (i = 0; i < nr_heads; i++) {
 655                struct ref *ref = to_fetch[i];
 656                if (!ref->name || !*ref->name)
 657                        die("cannot fetch by sha1 over smart http");
 658                argv[argc++] = ref->name;
 659        }
 660        argv[argc++] = NULL;
 661
 662        memset(&rpc, 0, sizeof(rpc));
 663        rpc.service_name = "git-upload-pack",
 664        rpc.argv = argv;
 665        rpc.gzip_request = 1;
 666
 667        err = rpc_service(&rpc, heads);
 668        if (rpc.result.len)
 669                safe_write(1, rpc.result.buf, rpc.result.len);
 670        strbuf_release(&rpc.result);
 671        free(argv);
 672        free(depth_arg);
 673        return err;
 674}
 675
 676static int fetch(int nr_heads, struct ref **to_fetch)
 677{
 678        struct discovery *d = discover_refs("git-upload-pack");
 679        if (d->proto_git)
 680                return fetch_git(d, nr_heads, to_fetch);
 681        else
 682                return fetch_dumb(nr_heads, to_fetch);
 683}
 684
 685static void parse_fetch(struct strbuf *buf)
 686{
 687        struct ref **to_fetch = NULL;
 688        struct ref *list_head = NULL;
 689        struct ref **list = &list_head;
 690        int alloc_heads = 0, nr_heads = 0;
 691
 692        do {
 693                if (!prefixcmp(buf->buf, "fetch ")) {
 694                        char *p = buf->buf + strlen("fetch ");
 695                        char *name;
 696                        struct ref *ref;
 697                        unsigned char old_sha1[20];
 698
 699                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 700                                die("protocol error: expected sha/ref, got %s'", p);
 701                        if (p[40] == ' ')
 702                                name = p + 41;
 703                        else if (!p[40])
 704                                name = "";
 705                        else
 706                                die("protocol error: expected sha/ref, got %s'", p);
 707
 708                        ref = alloc_ref(name);
 709                        hashcpy(ref->old_sha1, old_sha1);
 710
 711                        *list = ref;
 712                        list = &ref->next;
 713
 714                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 715                        to_fetch[nr_heads++] = ref;
 716                }
 717                else
 718                        die("http transport does not support %s", buf->buf);
 719
 720                strbuf_reset(buf);
 721                if (strbuf_getline(buf, stdin, '\n') == EOF)
 722                        return;
 723                if (!*buf->buf)
 724                        break;
 725        } while (1);
 726
 727        if (fetch(nr_heads, to_fetch))
 728                exit(128); /* error already reported */
 729        free_refs(list_head);
 730        free(to_fetch);
 731
 732        printf("\n");
 733        fflush(stdout);
 734        strbuf_reset(buf);
 735}
 736
 737static int push_dav(int nr_spec, char **specs)
 738{
 739        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 740        int argc = 0, i;
 741
 742        argv[argc++] = "http-push";
 743        argv[argc++] = "--helper-status";
 744        if (options.dry_run)
 745                argv[argc++] = "--dry-run";
 746        if (options.verbosity > 1)
 747                argv[argc++] = "--verbose";
 748        argv[argc++] = url;
 749        for (i = 0; i < nr_spec; i++)
 750                argv[argc++] = specs[i];
 751        argv[argc++] = NULL;
 752
 753        if (run_command_v_opt(argv, RUN_GIT_CMD))
 754                die("git-%s failed", argv[0]);
 755        free(argv);
 756        return 0;
 757}
 758
 759static int push_git(struct discovery *heads, int nr_spec, char **specs)
 760{
 761        struct rpc_state rpc;
 762        const char **argv;
 763        int argc = 0, i, err;
 764
 765        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 766        argv[argc++] = "send-pack";
 767        argv[argc++] = "--stateless-rpc";
 768        argv[argc++] = "--helper-status";
 769        if (options.thin)
 770                argv[argc++] = "--thin";
 771        if (options.dry_run)
 772                argv[argc++] = "--dry-run";
 773        if (options.verbosity == 0)
 774                argv[argc++] = "--quiet";
 775        else if (options.verbosity > 1)
 776                argv[argc++] = "--verbose";
 777        argv[argc++] = url;
 778        for (i = 0; i < nr_spec; i++)
 779                argv[argc++] = specs[i];
 780        argv[argc++] = NULL;
 781
 782        memset(&rpc, 0, sizeof(rpc));
 783        rpc.service_name = "git-receive-pack",
 784        rpc.argv = argv;
 785
 786        err = rpc_service(&rpc, heads);
 787        if (rpc.result.len)
 788                safe_write(1, rpc.result.buf, rpc.result.len);
 789        strbuf_release(&rpc.result);
 790        free(argv);
 791        return err;
 792}
 793
 794static int push(int nr_spec, char **specs)
 795{
 796        struct discovery *heads = discover_refs("git-receive-pack");
 797        int ret;
 798
 799        if (heads->proto_git)
 800                ret = push_git(heads, nr_spec, specs);
 801        else
 802                ret = push_dav(nr_spec, specs);
 803        free_discovery(heads);
 804        return ret;
 805}
 806
 807static void parse_push(struct strbuf *buf)
 808{
 809        char **specs = NULL;
 810        int alloc_spec = 0, nr_spec = 0, i, ret;
 811
 812        do {
 813                if (!prefixcmp(buf->buf, "push ")) {
 814                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 815                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 816                }
 817                else
 818                        die("http transport does not support %s", buf->buf);
 819
 820                strbuf_reset(buf);
 821                if (strbuf_getline(buf, stdin, '\n') == EOF)
 822                        goto free_specs;
 823                if (!*buf->buf)
 824                        break;
 825        } while (1);
 826
 827        ret = push(nr_spec, specs);
 828        printf("\n");
 829        fflush(stdout);
 830
 831        if (ret)
 832                exit(128); /* error already reported */
 833
 834 free_specs:
 835        for (i = 0; i < nr_spec; i++)
 836                free(specs[i]);
 837        free(specs);
 838}
 839
 840int main(int argc, const char **argv)
 841{
 842        struct strbuf buf = STRBUF_INIT;
 843        int nongit;
 844
 845        git_extract_argv0_path(argv[0]);
 846        setup_git_directory_gently(&nongit);
 847        if (argc < 2) {
 848                fprintf(stderr, "Remote needed\n");
 849                return 1;
 850        }
 851
 852        options.verbosity = 1;
 853        options.progress = !!isatty(2);
 854        options.thin = 1;
 855
 856        remote = remote_get(argv[1]);
 857
 858        if (argc > 2) {
 859                end_url_with_slash(&buf, argv[2]);
 860        } else {
 861                end_url_with_slash(&buf, remote->url[0]);
 862        }
 863
 864        url = strbuf_detach(&buf, NULL);
 865
 866        http_init(remote, url, 0);
 867
 868        do {
 869                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 870                        if (ferror(stdin))
 871                                fprintf(stderr, "Error reading command stream\n");
 872                        else
 873                                fprintf(stderr, "Unexpected end of command stream\n");
 874                        return 1;
 875                }
 876                if (buf.len == 0)
 877                        break;
 878                if (!prefixcmp(buf.buf, "fetch ")) {
 879                        if (nongit)
 880                                die("Fetch attempted without a local repo");
 881                        parse_fetch(&buf);
 882
 883                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 884                        int for_push = !!strstr(buf.buf + 4, "for-push");
 885                        output_refs(get_refs(for_push));
 886
 887                } else if (!prefixcmp(buf.buf, "push ")) {
 888                        parse_push(&buf);
 889
 890                } else if (!prefixcmp(buf.buf, "option ")) {
 891                        char *name = buf.buf + strlen("option ");
 892                        char *value = strchr(name, ' ');
 893                        int result;
 894
 895                        if (value)
 896                                *value++ = '\0';
 897                        else
 898                                value = "true";
 899
 900                        result = set_option(name, value);
 901                        if (!result)
 902                                printf("ok\n");
 903                        else if (result < 0)
 904                                printf("error invalid value\n");
 905                        else
 906                                printf("unsupported\n");
 907                        fflush(stdout);
 908
 909                } else if (!strcmp(buf.buf, "capabilities")) {
 910                        printf("fetch\n");
 911                        printf("option\n");
 912                        printf("push\n");
 913                        printf("\n");
 914                        fflush(stdout);
 915                } else {
 916                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 917                        return 1;
 918                }
 919                strbuf_reset(&buf);
 920        } while (1);
 921
 922        http_cleanup();
 923
 924        return 0;
 925}