Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-curl: use http_fetch_ref() instead of walker wrapper (aec4975)
   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);
  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 fd, void *data)
 188{
 189        struct discovery *heads = data;
 190        int err = 0;
 191        if (write_in_full(fd, heads->buf, heads->len) != heads->len)
 192                err = 1;
 193        close(fd);
 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
 206        if (start_async(&async))
 207                die("cannot start thread to parse advertised refs");
 208        get_remote_heads(async.out, &list, 0, NULL, 0, NULL);
 209        close(async.out);
 210        if (finish_async(&async))
 211                die("ref parsing thread failed");
 212        return list;
 213}
 214
 215static struct ref *parse_info_refs(struct discovery *heads)
 216{
 217        char *data, *start, *mid;
 218        char *ref_name;
 219        int i = 0;
 220
 221        struct ref *refs = NULL;
 222        struct ref *ref = NULL;
 223        struct ref *last_ref = NULL;
 224
 225        data = heads->buf;
 226        start = NULL;
 227        mid = data;
 228        while (i < heads->len) {
 229                if (!start) {
 230                        start = &data[i];
 231                }
 232                if (data[i] == '\t')
 233                        mid = &data[i];
 234                if (data[i] == '\n') {
 235                        data[i] = 0;
 236                        ref_name = mid + 1;
 237                        ref = xmalloc(sizeof(struct ref) +
 238                                      strlen(ref_name) + 1);
 239                        memset(ref, 0, sizeof(struct ref));
 240                        strcpy(ref->name, ref_name);
 241                        get_sha1_hex(start, ref->old_sha1);
 242                        if (!refs)
 243                                refs = ref;
 244                        if (last_ref)
 245                                last_ref->next = ref;
 246                        last_ref = ref;
 247                        start = NULL;
 248                }
 249                i++;
 250        }
 251
 252        ref = alloc_ref("HEAD");
 253        if (!http_fetch_ref(url, ref) &&
 254            !resolve_remote_symref(ref, refs)) {
 255                ref->next = refs;
 256                refs = ref;
 257        } else {
 258                free(ref);
 259        }
 260
 261        return refs;
 262}
 263
 264static struct ref *get_refs(int for_push)
 265{
 266        struct discovery *heads;
 267
 268        if (for_push)
 269                heads = discover_refs("git-receive-pack");
 270        else
 271                heads = discover_refs("git-upload-pack");
 272
 273        if (heads->proto_git)
 274                return parse_git_refs(heads);
 275        return parse_info_refs(heads);
 276}
 277
 278static void output_refs(struct ref *refs)
 279{
 280        struct ref *posn;
 281        for (posn = refs; posn; posn = posn->next) {
 282                if (posn->symref)
 283                        printf("@%s %s\n", posn->symref, posn->name);
 284                else
 285                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 286        }
 287        printf("\n");
 288        fflush(stdout);
 289        free_refs(refs);
 290}
 291
 292struct rpc_state {
 293        const char *service_name;
 294        const char **argv;
 295        char *service_url;
 296        char *hdr_content_type;
 297        char *hdr_accept;
 298        char *buf;
 299        size_t alloc;
 300        size_t len;
 301        size_t pos;
 302        int in;
 303        int out;
 304        struct strbuf result;
 305        unsigned gzip_request : 1;
 306        unsigned initial_buffer : 1;
 307};
 308
 309static size_t rpc_out(void *ptr, size_t eltsize,
 310                size_t nmemb, void *buffer_)
 311{
 312        size_t max = eltsize * nmemb;
 313        struct rpc_state *rpc = buffer_;
 314        size_t avail = rpc->len - rpc->pos;
 315
 316        if (!avail) {
 317                rpc->initial_buffer = 0;
 318                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 319                if (!avail)
 320                        return 0;
 321                rpc->pos = 0;
 322                rpc->len = avail;
 323        }
 324
 325        if (max < avail)
 326                avail = max;
 327        memcpy(ptr, rpc->buf + rpc->pos, avail);
 328        rpc->pos += avail;
 329        return avail;
 330}
 331
 332#ifndef NO_CURL_IOCTL
 333static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 334{
 335        struct rpc_state *rpc = clientp;
 336
 337        switch (cmd) {
 338        case CURLIOCMD_NOP:
 339                return CURLIOE_OK;
 340
 341        case CURLIOCMD_RESTARTREAD:
 342                if (rpc->initial_buffer) {
 343                        rpc->pos = 0;
 344                        return CURLIOE_OK;
 345                }
 346                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 347                return CURLIOE_FAILRESTART;
 348
 349        default:
 350                return CURLIOE_UNKNOWNCMD;
 351        }
 352}
 353#endif
 354
 355static size_t rpc_in(const void *ptr, size_t eltsize,
 356                size_t nmemb, void *buffer_)
 357{
 358        size_t size = eltsize * nmemb;
 359        struct rpc_state *rpc = buffer_;
 360        write_or_die(rpc->in, ptr, size);
 361        return size;
 362}
 363
 364static int post_rpc(struct rpc_state *rpc)
 365{
 366        struct active_request_slot *slot;
 367        struct slot_results results;
 368        struct curl_slist *headers = NULL;
 369        int use_gzip = rpc->gzip_request;
 370        char *gzip_body = NULL;
 371        int err = 0, large_request = 0;
 372
 373        /* Try to load the entire request, if we can fit it into the
 374         * allocated buffer space we can use HTTP/1.0 and avoid the
 375         * chunked encoding mess.
 376         */
 377        while (1) {
 378                size_t left = rpc->alloc - rpc->len;
 379                char *buf = rpc->buf + rpc->len;
 380                int n;
 381
 382                if (left < LARGE_PACKET_MAX) {
 383                        large_request = 1;
 384                        use_gzip = 0;
 385                        break;
 386                }
 387
 388                n = packet_read_line(rpc->out, buf, left);
 389                if (!n)
 390                        break;
 391                rpc->len += n;
 392        }
 393
 394        slot = get_active_slot();
 395        slot->results = &results;
 396
 397        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 398        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 399        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 400        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 401
 402        headers = curl_slist_append(headers, rpc->hdr_content_type);
 403        headers = curl_slist_append(headers, rpc->hdr_accept);
 404
 405        if (large_request) {
 406                /* The request body is large and the size cannot be predicted.
 407                 * We must use chunked encoding to send it.
 408                 */
 409                headers = curl_slist_append(headers, "Expect: 100-continue");
 410                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 411                rpc->initial_buffer = 1;
 412                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 413                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 414#ifndef NO_CURL_IOCTL
 415                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 416                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 417#endif
 418                if (options.verbosity > 1) {
 419                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 420                        fflush(stderr);
 421                }
 422
 423        } else if (use_gzip && 1024 < rpc->len) {
 424                /* The client backend isn't giving us compressed data so
 425                 * we can try to deflate it ourselves, this may save on.
 426                 * the transfer time.
 427                 */
 428                size_t size;
 429                z_stream stream;
 430                int ret;
 431
 432                memset(&stream, 0, sizeof(stream));
 433                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 434                                Z_DEFLATED, (15 + 16),
 435                                8, Z_DEFAULT_STRATEGY);
 436                if (ret != Z_OK)
 437                        die("cannot deflate request; zlib init error %d", ret);
 438                size = deflateBound(&stream, rpc->len);
 439                gzip_body = xmalloc(size);
 440
 441                stream.next_in = (unsigned char *)rpc->buf;
 442                stream.avail_in = rpc->len;
 443                stream.next_out = (unsigned char *)gzip_body;
 444                stream.avail_out = size;
 445
 446                ret = deflate(&stream, Z_FINISH);
 447                if (ret != Z_STREAM_END)
 448                        die("cannot deflate request; zlib deflate error %d", ret);
 449
 450                ret = deflateEnd(&stream);
 451                if (ret != Z_OK)
 452                        die("cannot deflate request; zlib end error %d", ret);
 453
 454                size = stream.total_out;
 455
 456                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 457                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 458                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 459
 460                if (options.verbosity > 1) {
 461                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 462                                rpc->service_name,
 463                                (unsigned long)rpc->len, (unsigned long)size);
 464                        fflush(stderr);
 465                }
 466        } else {
 467                /* We know the complete request size in advance, use the
 468                 * more normal Content-Length approach.
 469                 */
 470                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 471                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 472                if (options.verbosity > 1) {
 473                        fprintf(stderr, "POST %s (%lu bytes)\n",
 474                                rpc->service_name, (unsigned long)rpc->len);
 475                        fflush(stderr);
 476                }
 477        }
 478
 479        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 480        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 481        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 482
 483        slot->curl_result = curl_easy_perform(slot->curl);
 484        finish_active_slot(slot);
 485
 486        if (results.curl_result != CURLE_OK) {
 487                err |= error("RPC failed; result=%d, HTTP code = %ld",
 488                        results.curl_result, results.http_code);
 489        }
 490
 491        curl_slist_free_all(headers);
 492        free(gzip_body);
 493        return err;
 494}
 495
 496static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 497{
 498        const char *svc = rpc->service_name;
 499        struct strbuf buf = STRBUF_INIT;
 500        struct child_process client;
 501        int err = 0;
 502
 503        init_walker();
 504        memset(&client, 0, sizeof(client));
 505        client.in = -1;
 506        client.out = -1;
 507        client.git_cmd = 1;
 508        client.argv = rpc->argv;
 509        if (start_command(&client))
 510                exit(1);
 511        if (heads)
 512                write_or_die(client.in, heads->buf, heads->len);
 513
 514        rpc->alloc = http_post_buffer;
 515        rpc->buf = xmalloc(rpc->alloc);
 516        rpc->in = client.in;
 517        rpc->out = client.out;
 518        strbuf_init(&rpc->result, 0);
 519
 520        strbuf_addf(&buf, "%s/%s", url, svc);
 521        rpc->service_url = strbuf_detach(&buf, NULL);
 522
 523        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 524        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 525
 526        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 527        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 528
 529        while (!err) {
 530                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 531                if (!n)
 532                        break;
 533                rpc->pos = 0;
 534                rpc->len = n;
 535                err |= post_rpc(rpc);
 536        }
 537        strbuf_read(&rpc->result, client.out, 0);
 538
 539        close(client.in);
 540        close(client.out);
 541        client.in = -1;
 542        client.out = -1;
 543
 544        err |= finish_command(&client);
 545        free(rpc->service_url);
 546        free(rpc->hdr_content_type);
 547        free(rpc->hdr_accept);
 548        free(rpc->buf);
 549        strbuf_release(&buf);
 550        return err;
 551}
 552
 553static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 554{
 555        char **targets = xmalloc(nr_heads * sizeof(char*));
 556        int ret, i;
 557
 558        if (options.depth)
 559                die("dumb http transport does not support --depth");
 560        for (i = 0; i < nr_heads; i++)
 561                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 562
 563        init_walker();
 564        walker->get_all = 1;
 565        walker->get_tree = 1;
 566        walker->get_history = 1;
 567        walker->get_verbosely = options.verbosity >= 3;
 568        walker->get_recover = 0;
 569        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 570
 571        for (i = 0; i < nr_heads; i++)
 572                free(targets[i]);
 573        free(targets);
 574
 575        return ret ? error("Fetch failed.") : 0;
 576}
 577
 578static int fetch_git(struct discovery *heads,
 579        int nr_heads, struct ref **to_fetch)
 580{
 581        struct rpc_state rpc;
 582        char *depth_arg = NULL;
 583        const char **argv;
 584        int argc = 0, i, err;
 585
 586        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 587        argv[argc++] = "fetch-pack";
 588        argv[argc++] = "--stateless-rpc";
 589        argv[argc++] = "--lock-pack";
 590        if (options.followtags)
 591                argv[argc++] = "--include-tag";
 592        if (options.thin)
 593                argv[argc++] = "--thin";
 594        if (options.verbosity >= 3) {
 595                argv[argc++] = "-v";
 596                argv[argc++] = "-v";
 597        }
 598        if (!options.progress)
 599                argv[argc++] = "--no-progress";
 600        if (options.depth) {
 601                struct strbuf buf = STRBUF_INIT;
 602                strbuf_addf(&buf, "--depth=%lu", options.depth);
 603                depth_arg = strbuf_detach(&buf, NULL);
 604                argv[argc++] = depth_arg;
 605        }
 606        argv[argc++] = url;
 607        for (i = 0; i < nr_heads; i++) {
 608                struct ref *ref = to_fetch[i];
 609                if (!ref->name || !*ref->name)
 610                        die("cannot fetch by sha1 over smart http");
 611                argv[argc++] = ref->name;
 612        }
 613        argv[argc++] = NULL;
 614
 615        memset(&rpc, 0, sizeof(rpc));
 616        rpc.service_name = "git-upload-pack",
 617        rpc.argv = argv;
 618        rpc.gzip_request = 1;
 619
 620        err = rpc_service(&rpc, heads);
 621        if (rpc.result.len)
 622                safe_write(1, rpc.result.buf, rpc.result.len);
 623        strbuf_release(&rpc.result);
 624        free(argv);
 625        free(depth_arg);
 626        return err;
 627}
 628
 629static int fetch(int nr_heads, struct ref **to_fetch)
 630{
 631        struct discovery *d = discover_refs("git-upload-pack");
 632        if (d->proto_git)
 633                return fetch_git(d, nr_heads, to_fetch);
 634        else
 635                return fetch_dumb(nr_heads, to_fetch);
 636}
 637
 638static void parse_fetch(struct strbuf *buf)
 639{
 640        struct ref **to_fetch = NULL;
 641        struct ref *list_head = NULL;
 642        struct ref **list = &list_head;
 643        int alloc_heads = 0, nr_heads = 0;
 644
 645        do {
 646                if (!prefixcmp(buf->buf, "fetch ")) {
 647                        char *p = buf->buf + strlen("fetch ");
 648                        char *name;
 649                        struct ref *ref;
 650                        unsigned char old_sha1[20];
 651
 652                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 653                                die("protocol error: expected sha/ref, got %s'", p);
 654                        if (p[40] == ' ')
 655                                name = p + 41;
 656                        else if (!p[40])
 657                                name = "";
 658                        else
 659                                die("protocol error: expected sha/ref, got %s'", p);
 660
 661                        ref = alloc_ref(name);
 662                        hashcpy(ref->old_sha1, old_sha1);
 663
 664                        *list = ref;
 665                        list = &ref->next;
 666
 667                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 668                        to_fetch[nr_heads++] = ref;
 669                }
 670                else
 671                        die("http transport does not support %s", buf->buf);
 672
 673                strbuf_reset(buf);
 674                if (strbuf_getline(buf, stdin, '\n') == EOF)
 675                        return;
 676                if (!*buf->buf)
 677                        break;
 678        } while (1);
 679
 680        if (fetch(nr_heads, to_fetch))
 681                exit(128); /* error already reported */
 682        free_refs(list_head);
 683        free(to_fetch);
 684
 685        printf("\n");
 686        fflush(stdout);
 687        strbuf_reset(buf);
 688}
 689
 690static int push_dav(int nr_spec, char **specs)
 691{
 692        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 693        int argc = 0, i;
 694
 695        argv[argc++] = "http-push";
 696        argv[argc++] = "--helper-status";
 697        if (options.dry_run)
 698                argv[argc++] = "--dry-run";
 699        if (options.verbosity > 1)
 700                argv[argc++] = "--verbose";
 701        argv[argc++] = url;
 702        for (i = 0; i < nr_spec; i++)
 703                argv[argc++] = specs[i];
 704        argv[argc++] = NULL;
 705
 706        if (run_command_v_opt(argv, RUN_GIT_CMD))
 707                die("git-%s failed", argv[0]);
 708        free(argv);
 709        return 0;
 710}
 711
 712static int push_git(struct discovery *heads, int nr_spec, char **specs)
 713{
 714        struct rpc_state rpc;
 715        const char **argv;
 716        int argc = 0, i, err;
 717
 718        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 719        argv[argc++] = "send-pack";
 720        argv[argc++] = "--stateless-rpc";
 721        argv[argc++] = "--helper-status";
 722        if (options.thin)
 723                argv[argc++] = "--thin";
 724        if (options.dry_run)
 725                argv[argc++] = "--dry-run";
 726        if (options.verbosity > 1)
 727                argv[argc++] = "--verbose";
 728        argv[argc++] = url;
 729        for (i = 0; i < nr_spec; i++)
 730                argv[argc++] = specs[i];
 731        argv[argc++] = NULL;
 732
 733        memset(&rpc, 0, sizeof(rpc));
 734        rpc.service_name = "git-receive-pack",
 735        rpc.argv = argv;
 736
 737        err = rpc_service(&rpc, heads);
 738        if (rpc.result.len)
 739                safe_write(1, rpc.result.buf, rpc.result.len);
 740        strbuf_release(&rpc.result);
 741        free(argv);
 742        return err;
 743}
 744
 745static int push(int nr_spec, char **specs)
 746{
 747        struct discovery *heads = discover_refs("git-receive-pack");
 748        int ret;
 749
 750        if (heads->proto_git)
 751                ret = push_git(heads, nr_spec, specs);
 752        else
 753                ret = push_dav(nr_spec, specs);
 754        free_discovery(heads);
 755        return ret;
 756}
 757
 758static void parse_push(struct strbuf *buf)
 759{
 760        char **specs = NULL;
 761        int alloc_spec = 0, nr_spec = 0, i;
 762
 763        do {
 764                if (!prefixcmp(buf->buf, "push ")) {
 765                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 766                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 767                }
 768                else
 769                        die("http transport does not support %s", buf->buf);
 770
 771                strbuf_reset(buf);
 772                if (strbuf_getline(buf, stdin, '\n') == EOF)
 773                        return;
 774                if (!*buf->buf)
 775                        break;
 776        } while (1);
 777
 778        if (push(nr_spec, specs))
 779                exit(128); /* error already reported */
 780        for (i = 0; i < nr_spec; i++)
 781                free(specs[i]);
 782        free(specs);
 783
 784        printf("\n");
 785        fflush(stdout);
 786}
 787
 788int main(int argc, const char **argv)
 789{
 790        struct strbuf buf = STRBUF_INIT;
 791        int nongit;
 792
 793        git_extract_argv0_path(argv[0]);
 794        setup_git_directory_gently(&nongit);
 795        if (argc < 2) {
 796                fprintf(stderr, "Remote needed\n");
 797                return 1;
 798        }
 799
 800        options.verbosity = 1;
 801        options.progress = !!isatty(2);
 802        options.thin = 1;
 803
 804        remote = remote_get(argv[1]);
 805
 806        if (argc > 2) {
 807                url = argv[2];
 808        } else {
 809                url = remote->url[0];
 810        }
 811
 812        http_init(remote);
 813
 814        do {
 815                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 816                        break;
 817                if (!prefixcmp(buf.buf, "fetch ")) {
 818                        if (nongit)
 819                                die("Fetch attempted without a local repo");
 820                        parse_fetch(&buf);
 821
 822                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 823                        int for_push = !!strstr(buf.buf + 4, "for-push");
 824                        output_refs(get_refs(for_push));
 825
 826                } else if (!prefixcmp(buf.buf, "push ")) {
 827                        parse_push(&buf);
 828
 829                } else if (!prefixcmp(buf.buf, "option ")) {
 830                        char *name = buf.buf + strlen("option ");
 831                        char *value = strchr(name, ' ');
 832                        int result;
 833
 834                        if (value)
 835                                *value++ = '\0';
 836                        else
 837                                value = "true";
 838
 839                        result = set_option(name, value);
 840                        if (!result)
 841                                printf("ok\n");
 842                        else if (result < 0)
 843                                printf("error invalid value\n");
 844                        else
 845                                printf("unsupported\n");
 846                        fflush(stdout);
 847
 848                } else if (!strcmp(buf.buf, "capabilities")) {
 849                        printf("fetch\n");
 850                        printf("option\n");
 851                        printf("push\n");
 852                        printf("\n");
 853                        fflush(stdout);
 854                } else {
 855                        return 1;
 856                }
 857                strbuf_reset(&buf);
 858        } while (1);
 859
 860        http_cleanup();
 861
 862        return 0;
 863}