0eb6fc48fbb8f9c599386381539bd2fa4d23e40e
   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;
 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        switch (http_ret) {
 125        case HTTP_OK:
 126                break;
 127        case HTTP_MISSING_TARGET:
 128                die("%s not found: did you run git update-server-info on the"
 129                    " server?", refs_url);
 130        default:
 131                http_error(refs_url, http_ret);
 132                die("HTTP request failed");
 133        }
 134
 135        last= xcalloc(1, sizeof(*last_discovery));
 136        last->service = service;
 137        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 138        last->buf = last->buf_alloc;
 139
 140        if (is_http && 5 <= last->len && last->buf[4] == '#') {
 141                /* smart HTTP response; validate that the service
 142                 * pkt-line matches our request.
 143                 */
 144                struct strbuf exp = STRBUF_INIT;
 145
 146                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 147                        die("%s has invalid packet header", refs_url);
 148                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 149                        strbuf_setlen(&buffer, buffer.len - 1);
 150
 151                strbuf_addf(&exp, "# service=%s", service);
 152                if (strbuf_cmp(&exp, &buffer))
 153                        die("invalid server response; got '%s'", buffer.buf);
 154                strbuf_release(&exp);
 155
 156                /* The header can include additional metadata lines, up
 157                 * until a packet flush marker.  Ignore these now, but
 158                 * in the future we might start to scan them.
 159                 */
 160                strbuf_reset(&buffer);
 161                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 162                        strbuf_reset(&buffer);
 163
 164                last->proto_git = 1;
 165        }
 166
 167        free(refs_url);
 168        strbuf_release(&buffer);
 169        last_discovery = last;
 170        return last;
 171}
 172
 173static int write_discovery(int fd, void *data)
 174{
 175        struct discovery *heads = data;
 176        int err = 0;
 177        if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 178                err = 1;
 179        close(fd);
 180        return err;
 181}
 182
 183static struct ref *parse_git_refs(struct discovery *heads)
 184{
 185        struct ref *list = NULL;
 186        struct async async;
 187
 188        memset(&async, 0, sizeof(async));
 189        async.proc = write_discovery;
 190        async.data = heads;
 191
 192        if (start_async(&async))
 193                die("cannot start thread to parse advertised refs");
 194        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 195        close(async.out);
 196        if (finish_async(&async))
 197                die("ref parsing thread failed");
 198        return list;
 199}
 200
 201static struct ref *parse_info_refs(struct discovery *heads)
 202{
 203        char *data, *start, *mid;
 204        char *ref_name;
 205        int i = 0;
 206
 207        struct ref *refs = NULL;
 208        struct ref *ref = NULL;
 209        struct ref *last_ref = NULL;
 210
 211        data = heads->buf;
 212        start = NULL;
 213        mid = data;
 214        while (i < heads->len) {
 215                if (!start) {
 216                        start = &data[i];
 217                }
 218                if (data[i] == '\t')
 219                        mid = &data[i];
 220                if (data[i] == '\n') {
 221                        data[i] = 0;
 222                        ref_name = mid + 1;
 223                        ref = xmalloc(sizeof(struct ref) +
 224                                      strlen(ref_name) + 1);
 225                        memset(ref, 0, sizeof(struct ref));
 226                        strcpy(ref->name, ref_name);
 227                        get_sha1_hex(start, ref->old_sha1);
 228                        if (!refs)
 229                                refs = ref;
 230                        if (last_ref)
 231                                last_ref->next = ref;
 232                        last_ref = ref;
 233                        start = NULL;
 234                }
 235                i++;
 236        }
 237
 238        init_walker();
 239        ref = alloc_ref("HEAD");
 240        if (!walker->fetch_ref(walker, ref) &&
 241            !resolve_remote_symref(ref, refs)) {
 242                ref->next = refs;
 243                refs = ref;
 244        } else {
 245                free(ref);
 246        }
 247
 248        return refs;
 249}
 250
 251static struct ref *get_refs(int for_push)
 252{
 253        struct discovery *heads;
 254
 255        if (for_push)
 256                heads = discover_refs("git-receive-pack");
 257        else
 258                heads = discover_refs("git-upload-pack");
 259
 260        if (heads->proto_git)
 261                return parse_git_refs(heads);
 262        return parse_info_refs(heads);
 263}
 264
 265static void output_refs(struct ref *refs)
 266{
 267        struct ref *posn;
 268        for (posn = refs; posn; posn = posn->next) {
 269                if (posn->symref)
 270                        printf("@%s %s\n", posn->symref, posn->name);
 271                else
 272                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 273        }
 274        printf("\n");
 275        fflush(stdout);
 276        free_refs(refs);
 277}
 278
 279struct rpc_state {
 280        const char *service_name;
 281        const char **argv;
 282        char *service_url;
 283        char *hdr_content_type;
 284        char *hdr_accept;
 285        char *buf;
 286        size_t alloc;
 287        size_t len;
 288        size_t pos;
 289        int in;
 290        int out;
 291        struct strbuf result;
 292};
 293
 294static size_t rpc_out(void *ptr, size_t eltsize,
 295                size_t nmemb, void *buffer_)
 296{
 297        size_t max = eltsize * nmemb;
 298        struct rpc_state *rpc = buffer_;
 299        size_t avail = rpc->len - rpc->pos;
 300
 301        if (!avail) {
 302                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 303                if (!avail)
 304                        return 0;
 305                rpc->pos = 0;
 306                rpc->len = avail;
 307        }
 308
 309        if (max < avail);
 310                avail = max;
 311        memcpy(ptr, rpc->buf + rpc->pos, avail);
 312        rpc->pos += avail;
 313        return avail;
 314}
 315
 316static size_t rpc_in(const void *ptr, size_t eltsize,
 317                size_t nmemb, void *buffer_)
 318{
 319        size_t size = eltsize * nmemb;
 320        struct rpc_state *rpc = buffer_;
 321        write_or_die(rpc->in, ptr, size);
 322        return size;
 323}
 324
 325static int post_rpc(struct rpc_state *rpc)
 326{
 327        struct active_request_slot *slot;
 328        struct slot_results results;
 329        struct curl_slist *headers = NULL;
 330        int err = 0, large_request = 0;
 331
 332        /* Try to load the entire request, if we can fit it into the
 333         * allocated buffer space we can use HTTP/1.0 and avoid the
 334         * chunked encoding mess.
 335         */
 336        while (1) {
 337                size_t left = rpc->alloc - rpc->len;
 338                char *buf = rpc->buf + rpc->len;
 339                int n;
 340
 341                if (left < LARGE_PACKET_MAX) {
 342                        large_request = 1;
 343                        break;
 344                }
 345
 346                n = packet_read_line(rpc->out, buf, left);
 347                if (!n)
 348                        break;
 349                rpc->len += n;
 350        }
 351
 352        slot = get_active_slot();
 353        slot->results = &results;
 354
 355        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 356        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 357        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 358
 359        headers = curl_slist_append(headers, rpc->hdr_content_type);
 360        headers = curl_slist_append(headers, rpc->hdr_accept);
 361
 362        if (large_request) {
 363                /* The request body is large and the size cannot be predicted.
 364                 * We must use chunked encoding to send it.
 365                 */
 366                headers = curl_slist_append(headers, "Expect: 100-continue");
 367                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 368                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 369                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 370                if (options.verbosity > 1) {
 371                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 372                        fflush(stderr);
 373                }
 374
 375        } else {
 376                /* We know the complete request size in advance, use the
 377                 * more normal Content-Length approach.
 378                 */
 379                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 380                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 381                if (options.verbosity > 1) {
 382                        fprintf(stderr, "POST %s (%lu bytes)\n",
 383                                rpc->service_name, (unsigned long)rpc->len);
 384                        fflush(stderr);
 385                }
 386        }
 387
 388        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 389        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 390        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 391
 392        slot->curl_result = curl_easy_perform(slot->curl);
 393        finish_active_slot(slot);
 394
 395        if (results.curl_result != CURLE_OK) {
 396                err |= error("RPC failed; result=%d, HTTP code = %ld",
 397                        results.curl_result, results.http_code);
 398        }
 399
 400        curl_slist_free_all(headers);
 401        return err;
 402}
 403
 404static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 405{
 406        const char *svc = rpc->service_name;
 407        struct strbuf buf = STRBUF_INIT;
 408        struct child_process client;
 409        int err = 0;
 410
 411        init_walker();
 412        memset(&client, 0, sizeof(client));
 413        client.in = -1;
 414        client.out = -1;
 415        client.git_cmd = 1;
 416        client.argv = rpc->argv;
 417        if (start_command(&client))
 418                exit(1);
 419        if (heads)
 420                write_or_die(client.in, heads->buf, heads->len);
 421
 422        rpc->alloc = http_post_buffer;
 423        rpc->buf = xmalloc(rpc->alloc);
 424        rpc->in = client.in;
 425        rpc->out = client.out;
 426        strbuf_init(&rpc->result, 0);
 427
 428        strbuf_addf(&buf, "%s/%s", url, svc);
 429        rpc->service_url = strbuf_detach(&buf, NULL);
 430
 431        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 432        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 433
 434        strbuf_addf(&buf, "Accept: application/x-%s-response", svc);
 435        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 436
 437        while (!err) {
 438                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 439                if (!n)
 440                        break;
 441                rpc->pos = 0;
 442                rpc->len = n;
 443                err |= post_rpc(rpc);
 444        }
 445        strbuf_read(&rpc->result, client.out, 0);
 446
 447        close(client.in);
 448        close(client.out);
 449        client.in = -1;
 450        client.out = -1;
 451
 452        err |= finish_command(&client);
 453        free(rpc->service_url);
 454        free(rpc->hdr_content_type);
 455        free(rpc->hdr_accept);
 456        free(rpc->buf);
 457        strbuf_release(&buf);
 458        return err;
 459}
 460
 461static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 462{
 463        char **targets = xmalloc(nr_heads * sizeof(char*));
 464        int ret, i;
 465
 466        if (options.depth)
 467                die("dumb http transport does not support --depth");
 468        for (i = 0; i < nr_heads; i++)
 469                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 470
 471        init_walker();
 472        walker->get_all = 1;
 473        walker->get_tree = 1;
 474        walker->get_history = 1;
 475        walker->get_verbosely = options.verbosity >= 3;
 476        walker->get_recover = 0;
 477        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 478
 479        for (i = 0; i < nr_heads; i++)
 480                free(targets[i]);
 481        free(targets);
 482
 483        return ret ? error("Fetch failed.") : 0;
 484}
 485
 486static int fetch_git(struct discovery *heads,
 487        int nr_heads, struct ref **to_fetch)
 488{
 489        struct rpc_state rpc;
 490        char *depth_arg = NULL;
 491        const char **argv;
 492        int argc = 0, i, err;
 493
 494        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 495        argv[argc++] = "fetch-pack";
 496        argv[argc++] = "--stateless-rpc";
 497        argv[argc++] = "--lock-pack";
 498        if (options.followtags)
 499                argv[argc++] = "--include-tag";
 500        if (options.thin)
 501                argv[argc++] = "--thin";
 502        if (options.verbosity >= 3) {
 503                argv[argc++] = "-v";
 504                argv[argc++] = "-v";
 505        }
 506        if (!options.progress)
 507                argv[argc++] = "--no-progress";
 508        if (options.depth) {
 509                struct strbuf buf = STRBUF_INIT;
 510                strbuf_addf(&buf, "--depth=%lu", options.depth);
 511                depth_arg = strbuf_detach(&buf, NULL);
 512                argv[argc++] = depth_arg;
 513        }
 514        argv[argc++] = url;
 515        for (i = 0; i < nr_heads; i++) {
 516                struct ref *ref = to_fetch[i];
 517                if (!ref->name || !*ref->name)
 518                        die("cannot fetch by sha1 over smart http");
 519                argv[argc++] = ref->name;
 520        }
 521        argv[argc++] = NULL;
 522
 523        memset(&rpc, 0, sizeof(rpc));
 524        rpc.service_name = "git-upload-pack",
 525        rpc.argv = argv;
 526
 527        err = rpc_service(&rpc, heads);
 528        if (rpc.result.len)
 529                safe_write(1, rpc.result.buf, rpc.result.len);
 530        strbuf_release(&rpc.result);
 531        free(argv);
 532        free(depth_arg);
 533        return err;
 534}
 535
 536static int fetch(int nr_heads, struct ref **to_fetch)
 537{
 538        struct discovery *d = discover_refs("git-upload-pack");
 539        if (d->proto_git)
 540                return fetch_git(d, nr_heads, to_fetch);
 541        else
 542                return fetch_dumb(nr_heads, to_fetch);
 543}
 544
 545static void parse_fetch(struct strbuf *buf)
 546{
 547        struct ref **to_fetch = NULL;
 548        struct ref *list_head = NULL;
 549        struct ref **list = &list_head;
 550        int alloc_heads = 0, nr_heads = 0;
 551
 552        do {
 553                if (!prefixcmp(buf->buf, "fetch ")) {
 554                        char *p = buf->buf + strlen("fetch ");
 555                        char *name;
 556                        struct ref *ref;
 557                        unsigned char old_sha1[20];
 558
 559                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 560                                die("protocol error: expected sha/ref, got %s'", p);
 561                        if (p[40] == ' ')
 562                                name = p + 41;
 563                        else if (!p[40])
 564                                name = "";
 565                        else
 566                                die("protocol error: expected sha/ref, got %s'", p);
 567
 568                        ref = alloc_ref(name);
 569                        hashcpy(ref->old_sha1, old_sha1);
 570
 571                        *list = ref;
 572                        list = &ref->next;
 573
 574                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 575                        to_fetch[nr_heads++] = ref;
 576                }
 577                else
 578                        die("http transport does not support %s", buf->buf);
 579
 580                strbuf_reset(buf);
 581                if (strbuf_getline(buf, stdin, '\n') == EOF)
 582                        return;
 583                if (!*buf->buf)
 584                        break;
 585        } while (1);
 586
 587        if (fetch(nr_heads, to_fetch))
 588                exit(128); /* error already reported */
 589        free_refs(list_head);
 590        free(to_fetch);
 591
 592        printf("\n");
 593        fflush(stdout);
 594        strbuf_reset(buf);
 595}
 596
 597static int push_dav(int nr_spec, char **specs)
 598{
 599        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 600        int argc = 0, i;
 601
 602        argv[argc++] = "http-push";
 603        argv[argc++] = "--helper-status";
 604        if (options.dry_run)
 605                argv[argc++] = "--dry-run";
 606        if (options.verbosity > 1)
 607                argv[argc++] = "--verbose";
 608        argv[argc++] = url;
 609        for (i = 0; i < nr_spec; i++)
 610                argv[argc++] = specs[i];
 611        argv[argc++] = NULL;
 612
 613        if (run_command_v_opt(argv, RUN_GIT_CMD))
 614                die("git-%s failed", argv[0]);
 615        free(argv);
 616        return 0;
 617}
 618
 619static int push_git(struct discovery *heads, int nr_spec, char **specs)
 620{
 621        struct rpc_state rpc;
 622        const char **argv;
 623        int argc = 0, i, err;
 624
 625        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 626        argv[argc++] = "send-pack";
 627        argv[argc++] = "--stateless-rpc";
 628        argv[argc++] = "--helper-status";
 629        if (options.thin)
 630                argv[argc++] = "--thin";
 631        if (options.dry_run)
 632                argv[argc++] = "--dry-run";
 633        if (options.verbosity > 1)
 634                argv[argc++] = "--verbose";
 635        argv[argc++] = url;
 636        for (i = 0; i < nr_spec; i++)
 637                argv[argc++] = specs[i];
 638        argv[argc++] = NULL;
 639
 640        memset(&rpc, 0, sizeof(rpc));
 641        rpc.service_name = "git-receive-pack",
 642        rpc.argv = argv;
 643
 644        err = rpc_service(&rpc, heads);
 645        if (rpc.result.len)
 646                safe_write(1, rpc.result.buf, rpc.result.len);
 647        strbuf_release(&rpc.result);
 648        free(argv);
 649        return err;
 650}
 651
 652static int push(int nr_spec, char **specs)
 653{
 654        struct discovery *heads = discover_refs("git-receive-pack");
 655        int ret;
 656
 657        if (heads->proto_git)
 658                ret = push_git(heads, nr_spec, specs);
 659        else
 660                ret = push_dav(nr_spec, specs);
 661        free_discovery(heads);
 662        return ret;
 663}
 664
 665static void parse_push(struct strbuf *buf)
 666{
 667        char **specs = NULL;
 668        int alloc_spec = 0, nr_spec = 0, i;
 669
 670        do {
 671                if (!prefixcmp(buf->buf, "push ")) {
 672                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 673                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 674                }
 675                else
 676                        die("http transport does not support %s", buf->buf);
 677
 678                strbuf_reset(buf);
 679                if (strbuf_getline(buf, stdin, '\n') == EOF)
 680                        return;
 681                if (!*buf->buf)
 682                        break;
 683        } while (1);
 684
 685        if (push(nr_spec, specs))
 686                exit(128); /* error already reported */
 687        for (i = 0; i < nr_spec; i++)
 688                free(specs[i]);
 689        free(specs);
 690
 691        printf("\n");
 692        fflush(stdout);
 693}
 694
 695int main(int argc, const char **argv)
 696{
 697        struct strbuf buf = STRBUF_INIT;
 698
 699        git_extract_argv0_path(argv[0]);
 700        setup_git_directory();
 701        if (argc < 2) {
 702                fprintf(stderr, "Remote needed\n");
 703                return 1;
 704        }
 705
 706        options.verbosity = 1;
 707        options.progress = !!isatty(2);
 708        options.thin = 1;
 709
 710        remote = remote_get(argv[1]);
 711
 712        if (argc > 2) {
 713                url = argv[2];
 714        } else {
 715                url = remote->url[0];
 716        }
 717
 718        do {
 719                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 720                        break;
 721                if (!prefixcmp(buf.buf, "fetch ")) {
 722                        parse_fetch(&buf);
 723
 724                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 725                        int for_push = !!strstr(buf.buf + 4, "for-push");
 726                        output_refs(get_refs(for_push));
 727
 728                } else if (!prefixcmp(buf.buf, "push ")) {
 729                        parse_push(&buf);
 730
 731                } else if (!prefixcmp(buf.buf, "option ")) {
 732                        char *name = buf.buf + strlen("option ");
 733                        char *value = strchr(name, ' ');
 734                        int result;
 735
 736                        if (value)
 737                                *value++ = '\0';
 738                        else
 739                                value = "true";
 740
 741                        result = set_option(name, value);
 742                        if (!result)
 743                                printf("ok\n");
 744                        else if (result < 0)
 745                                printf("error invalid value\n");
 746                        else
 747                                printf("unsupported\n");
 748                        fflush(stdout);
 749
 750                } else if (!strcmp(buf.buf, "capabilities")) {
 751                        printf("fetch\n");
 752                        printf("option\n");
 753                        printf("push\n");
 754                        printf("\n");
 755                        fflush(stdout);
 756                } else {
 757                        return 1;
 758                }
 759                strbuf_reset(&buf);
 760        } while (1);
 761        return 0;
 762}