Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit Submodules: Use "ignore" settings from .gitmodules too for diff and status (302ad7a)
   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) {
 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)
 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, 0, NULL, 0, NULL);
 204        close(async.out);
 205        if (finish_async(&async))
 206                die("ref parsing thread failed");
 207        return list;
 208}
 209
 210static struct ref *parse_info_refs(struct discovery *heads)
 211{
 212        char *data, *start, *mid;
 213        char *ref_name;
 214        int i = 0;
 215
 216        struct ref *refs = NULL;
 217        struct ref *ref = NULL;
 218        struct ref *last_ref = NULL;
 219
 220        data = heads->buf;
 221        start = NULL;
 222        mid = data;
 223        while (i < heads->len) {
 224                if (!start) {
 225                        start = &data[i];
 226                }
 227                if (data[i] == '\t')
 228                        mid = &data[i];
 229                if (data[i] == '\n') {
 230                        data[i] = 0;
 231                        ref_name = mid + 1;
 232                        ref = xmalloc(sizeof(struct ref) +
 233                                      strlen(ref_name) + 1);
 234                        memset(ref, 0, sizeof(struct ref));
 235                        strcpy(ref->name, ref_name);
 236                        get_sha1_hex(start, ref->old_sha1);
 237                        if (!refs)
 238                                refs = ref;
 239                        if (last_ref)
 240                                last_ref->next = ref;
 241                        last_ref = ref;
 242                        start = NULL;
 243                }
 244                i++;
 245        }
 246
 247        ref = alloc_ref("HEAD");
 248        if (!http_fetch_ref(url, ref) &&
 249            !resolve_remote_symref(ref, refs)) {
 250                ref->next = refs;
 251                refs = ref;
 252        } else {
 253                free(ref);
 254        }
 255
 256        return refs;
 257}
 258
 259static struct ref *get_refs(int for_push)
 260{
 261        struct discovery *heads;
 262
 263        if (for_push)
 264                heads = discover_refs("git-receive-pack");
 265        else
 266                heads = discover_refs("git-upload-pack");
 267
 268        if (heads->proto_git)
 269                return parse_git_refs(heads);
 270        return parse_info_refs(heads);
 271}
 272
 273static void output_refs(struct ref *refs)
 274{
 275        struct ref *posn;
 276        for (posn = refs; posn; posn = posn->next) {
 277                if (posn->symref)
 278                        printf("@%s %s\n", posn->symref, posn->name);
 279                else
 280                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 281        }
 282        printf("\n");
 283        fflush(stdout);
 284        free_refs(refs);
 285}
 286
 287struct rpc_state {
 288        const char *service_name;
 289        const char **argv;
 290        char *service_url;
 291        char *hdr_content_type;
 292        char *hdr_accept;
 293        char *buf;
 294        size_t alloc;
 295        size_t len;
 296        size_t pos;
 297        int in;
 298        int out;
 299        struct strbuf result;
 300        unsigned gzip_request : 1;
 301        unsigned initial_buffer : 1;
 302};
 303
 304static size_t rpc_out(void *ptr, size_t eltsize,
 305                size_t nmemb, void *buffer_)
 306{
 307        size_t max = eltsize * nmemb;
 308        struct rpc_state *rpc = buffer_;
 309        size_t avail = rpc->len - rpc->pos;
 310
 311        if (!avail) {
 312                rpc->initial_buffer = 0;
 313                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 314                if (!avail)
 315                        return 0;
 316                rpc->pos = 0;
 317                rpc->len = avail;
 318        }
 319
 320        if (max < avail)
 321                avail = max;
 322        memcpy(ptr, rpc->buf + rpc->pos, avail);
 323        rpc->pos += avail;
 324        return avail;
 325}
 326
 327#ifndef NO_CURL_IOCTL
 328static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 329{
 330        struct rpc_state *rpc = clientp;
 331
 332        switch (cmd) {
 333        case CURLIOCMD_NOP:
 334                return CURLIOE_OK;
 335
 336        case CURLIOCMD_RESTARTREAD:
 337                if (rpc->initial_buffer) {
 338                        rpc->pos = 0;
 339                        return CURLIOE_OK;
 340                }
 341                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 342                return CURLIOE_FAILRESTART;
 343
 344        default:
 345                return CURLIOE_UNKNOWNCMD;
 346        }
 347}
 348#endif
 349
 350static size_t rpc_in(const void *ptr, size_t eltsize,
 351                size_t nmemb, void *buffer_)
 352{
 353        size_t size = eltsize * nmemb;
 354        struct rpc_state *rpc = buffer_;
 355        write_or_die(rpc->in, ptr, size);
 356        return size;
 357}
 358
 359static int post_rpc(struct rpc_state *rpc)
 360{
 361        struct active_request_slot *slot;
 362        struct slot_results results;
 363        struct curl_slist *headers = NULL;
 364        int use_gzip = rpc->gzip_request;
 365        char *gzip_body = NULL;
 366        int err = 0, large_request = 0;
 367
 368        /* Try to load the entire request, if we can fit it into the
 369         * allocated buffer space we can use HTTP/1.0 and avoid the
 370         * chunked encoding mess.
 371         */
 372        while (1) {
 373                size_t left = rpc->alloc - rpc->len;
 374                char *buf = rpc->buf + rpc->len;
 375                int n;
 376
 377                if (left < LARGE_PACKET_MAX) {
 378                        large_request = 1;
 379                        use_gzip = 0;
 380                        break;
 381                }
 382
 383                n = packet_read_line(rpc->out, buf, left);
 384                if (!n)
 385                        break;
 386                rpc->len += n;
 387        }
 388
 389        slot = get_active_slot();
 390        slot->results = &results;
 391
 392        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 393        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 394        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 395        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 396
 397        headers = curl_slist_append(headers, rpc->hdr_content_type);
 398        headers = curl_slist_append(headers, rpc->hdr_accept);
 399
 400        if (large_request) {
 401                /* The request body is large and the size cannot be predicted.
 402                 * We must use chunked encoding to send it.
 403                 */
 404                headers = curl_slist_append(headers, "Expect: 100-continue");
 405                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 406                rpc->initial_buffer = 1;
 407                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 408                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 409#ifndef NO_CURL_IOCTL
 410                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 411                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 412#endif
 413                if (options.verbosity > 1) {
 414                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 415                        fflush(stderr);
 416                }
 417
 418        } else if (use_gzip && 1024 < rpc->len) {
 419                /* The client backend isn't giving us compressed data so
 420                 * we can try to deflate it ourselves, this may save on.
 421                 * the transfer time.
 422                 */
 423                size_t size;
 424                z_stream stream;
 425                int ret;
 426
 427                memset(&stream, 0, sizeof(stream));
 428                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 429                                Z_DEFLATED, (15 + 16),
 430                                8, Z_DEFAULT_STRATEGY);
 431                if (ret != Z_OK)
 432                        die("cannot deflate request; zlib init error %d", ret);
 433                size = deflateBound(&stream, rpc->len);
 434                gzip_body = xmalloc(size);
 435
 436                stream.next_in = (unsigned char *)rpc->buf;
 437                stream.avail_in = rpc->len;
 438                stream.next_out = (unsigned char *)gzip_body;
 439                stream.avail_out = size;
 440
 441                ret = deflate(&stream, Z_FINISH);
 442                if (ret != Z_STREAM_END)
 443                        die("cannot deflate request; zlib deflate error %d", ret);
 444
 445                ret = deflateEnd(&stream);
 446                if (ret != Z_OK)
 447                        die("cannot deflate request; zlib end error %d", ret);
 448
 449                size = stream.total_out;
 450
 451                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 452                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 453                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 454
 455                if (options.verbosity > 1) {
 456                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 457                                rpc->service_name,
 458                                (unsigned long)rpc->len, (unsigned long)size);
 459                        fflush(stderr);
 460                }
 461        } else {
 462                /* We know the complete request size in advance, use the
 463                 * more normal Content-Length approach.
 464                 */
 465                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 466                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 467                if (options.verbosity > 1) {
 468                        fprintf(stderr, "POST %s (%lu bytes)\n",
 469                                rpc->service_name, (unsigned long)rpc->len);
 470                        fflush(stderr);
 471                }
 472        }
 473
 474        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 475        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 476        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 477
 478        slot->curl_result = curl_easy_perform(slot->curl);
 479        finish_active_slot(slot);
 480
 481        if (results.curl_result != CURLE_OK) {
 482                err |= error("RPC failed; result=%d, HTTP code = %ld",
 483                        results.curl_result, results.http_code);
 484        }
 485
 486        curl_slist_free_all(headers);
 487        free(gzip_body);
 488        return err;
 489}
 490
 491static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 492{
 493        const char *svc = rpc->service_name;
 494        struct strbuf buf = STRBUF_INIT;
 495        struct child_process client;
 496        int err = 0;
 497
 498        memset(&client, 0, sizeof(client));
 499        client.in = -1;
 500        client.out = -1;
 501        client.git_cmd = 1;
 502        client.argv = rpc->argv;
 503        if (start_command(&client))
 504                exit(1);
 505        if (heads)
 506                write_or_die(client.in, heads->buf, heads->len);
 507
 508        rpc->alloc = http_post_buffer;
 509        rpc->buf = xmalloc(rpc->alloc);
 510        rpc->in = client.in;
 511        rpc->out = client.out;
 512        strbuf_init(&rpc->result, 0);
 513
 514        strbuf_addf(&buf, "%s%s", url, svc);
 515        rpc->service_url = strbuf_detach(&buf, NULL);
 516
 517        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 518        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 519
 520        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 521        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 522
 523        while (!err) {
 524                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 525                if (!n)
 526                        break;
 527                rpc->pos = 0;
 528                rpc->len = n;
 529                err |= post_rpc(rpc);
 530        }
 531        strbuf_read(&rpc->result, client.out, 0);
 532
 533        close(client.in);
 534        close(client.out);
 535        client.in = -1;
 536        client.out = -1;
 537
 538        err |= finish_command(&client);
 539        free(rpc->service_url);
 540        free(rpc->hdr_content_type);
 541        free(rpc->hdr_accept);
 542        free(rpc->buf);
 543        strbuf_release(&buf);
 544        return err;
 545}
 546
 547static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 548{
 549        struct walker *walker;
 550        char **targets = xmalloc(nr_heads * sizeof(char*));
 551        int ret, i;
 552
 553        if (options.depth)
 554                die("dumb http transport does not support --depth");
 555        for (i = 0; i < nr_heads; i++)
 556                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 557
 558        walker = get_http_walker(url);
 559        walker->get_all = 1;
 560        walker->get_tree = 1;
 561        walker->get_history = 1;
 562        walker->get_verbosely = options.verbosity >= 3;
 563        walker->get_recover = 0;
 564        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 565        walker_free(walker);
 566
 567        for (i = 0; i < nr_heads; i++)
 568                free(targets[i]);
 569        free(targets);
 570
 571        return ret ? error("Fetch failed.") : 0;
 572}
 573
 574static int fetch_git(struct discovery *heads,
 575        int nr_heads, struct ref **to_fetch)
 576{
 577        struct rpc_state rpc;
 578        char *depth_arg = NULL;
 579        const char **argv;
 580        int argc = 0, i, err;
 581
 582        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 583        argv[argc++] = "fetch-pack";
 584        argv[argc++] = "--stateless-rpc";
 585        argv[argc++] = "--lock-pack";
 586        if (options.followtags)
 587                argv[argc++] = "--include-tag";
 588        if (options.thin)
 589                argv[argc++] = "--thin";
 590        if (options.verbosity >= 3) {
 591                argv[argc++] = "-v";
 592                argv[argc++] = "-v";
 593        }
 594        if (!options.progress)
 595                argv[argc++] = "--no-progress";
 596        if (options.depth) {
 597                struct strbuf buf = STRBUF_INIT;
 598                strbuf_addf(&buf, "--depth=%lu", options.depth);
 599                depth_arg = strbuf_detach(&buf, NULL);
 600                argv[argc++] = depth_arg;
 601        }
 602        argv[argc++] = url;
 603        for (i = 0; i < nr_heads; i++) {
 604                struct ref *ref = to_fetch[i];
 605                if (!ref->name || !*ref->name)
 606                        die("cannot fetch by sha1 over smart http");
 607                argv[argc++] = ref->name;
 608        }
 609        argv[argc++] = NULL;
 610
 611        memset(&rpc, 0, sizeof(rpc));
 612        rpc.service_name = "git-upload-pack",
 613        rpc.argv = argv;
 614        rpc.gzip_request = 1;
 615
 616        err = rpc_service(&rpc, heads);
 617        if (rpc.result.len)
 618                safe_write(1, rpc.result.buf, rpc.result.len);
 619        strbuf_release(&rpc.result);
 620        free(argv);
 621        free(depth_arg);
 622        return err;
 623}
 624
 625static int fetch(int nr_heads, struct ref **to_fetch)
 626{
 627        struct discovery *d = discover_refs("git-upload-pack");
 628        if (d->proto_git)
 629                return fetch_git(d, nr_heads, to_fetch);
 630        else
 631                return fetch_dumb(nr_heads, to_fetch);
 632}
 633
 634static void parse_fetch(struct strbuf *buf)
 635{
 636        struct ref **to_fetch = NULL;
 637        struct ref *list_head = NULL;
 638        struct ref **list = &list_head;
 639        int alloc_heads = 0, nr_heads = 0;
 640
 641        do {
 642                if (!prefixcmp(buf->buf, "fetch ")) {
 643                        char *p = buf->buf + strlen("fetch ");
 644                        char *name;
 645                        struct ref *ref;
 646                        unsigned char old_sha1[20];
 647
 648                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 649                                die("protocol error: expected sha/ref, got %s'", p);
 650                        if (p[40] == ' ')
 651                                name = p + 41;
 652                        else if (!p[40])
 653                                name = "";
 654                        else
 655                                die("protocol error: expected sha/ref, got %s'", p);
 656
 657                        ref = alloc_ref(name);
 658                        hashcpy(ref->old_sha1, old_sha1);
 659
 660                        *list = ref;
 661                        list = &ref->next;
 662
 663                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 664                        to_fetch[nr_heads++] = ref;
 665                }
 666                else
 667                        die("http transport does not support %s", buf->buf);
 668
 669                strbuf_reset(buf);
 670                if (strbuf_getline(buf, stdin, '\n') == EOF)
 671                        return;
 672                if (!*buf->buf)
 673                        break;
 674        } while (1);
 675
 676        if (fetch(nr_heads, to_fetch))
 677                exit(128); /* error already reported */
 678        free_refs(list_head);
 679        free(to_fetch);
 680
 681        printf("\n");
 682        fflush(stdout);
 683        strbuf_reset(buf);
 684}
 685
 686static int push_dav(int nr_spec, char **specs)
 687{
 688        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 689        int argc = 0, i;
 690
 691        argv[argc++] = "http-push";
 692        argv[argc++] = "--helper-status";
 693        if (options.dry_run)
 694                argv[argc++] = "--dry-run";
 695        if (options.verbosity > 1)
 696                argv[argc++] = "--verbose";
 697        argv[argc++] = url;
 698        for (i = 0; i < nr_spec; i++)
 699                argv[argc++] = specs[i];
 700        argv[argc++] = NULL;
 701
 702        if (run_command_v_opt(argv, RUN_GIT_CMD))
 703                die("git-%s failed", argv[0]);
 704        free(argv);
 705        return 0;
 706}
 707
 708static int push_git(struct discovery *heads, int nr_spec, char **specs)
 709{
 710        struct rpc_state rpc;
 711        const char **argv;
 712        int argc = 0, i, err;
 713
 714        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 715        argv[argc++] = "send-pack";
 716        argv[argc++] = "--stateless-rpc";
 717        argv[argc++] = "--helper-status";
 718        if (options.thin)
 719                argv[argc++] = "--thin";
 720        if (options.dry_run)
 721                argv[argc++] = "--dry-run";
 722        if (options.verbosity > 1)
 723                argv[argc++] = "--verbose";
 724        argv[argc++] = url;
 725        for (i = 0; i < nr_spec; i++)
 726                argv[argc++] = specs[i];
 727        argv[argc++] = NULL;
 728
 729        memset(&rpc, 0, sizeof(rpc));
 730        rpc.service_name = "git-receive-pack",
 731        rpc.argv = argv;
 732
 733        err = rpc_service(&rpc, heads);
 734        if (rpc.result.len)
 735                safe_write(1, rpc.result.buf, rpc.result.len);
 736        strbuf_release(&rpc.result);
 737        free(argv);
 738        return err;
 739}
 740
 741static int push(int nr_spec, char **specs)
 742{
 743        struct discovery *heads = discover_refs("git-receive-pack");
 744        int ret;
 745
 746        if (heads->proto_git)
 747                ret = push_git(heads, nr_spec, specs);
 748        else
 749                ret = push_dav(nr_spec, specs);
 750        free_discovery(heads);
 751        return ret;
 752}
 753
 754static void parse_push(struct strbuf *buf)
 755{
 756        char **specs = NULL;
 757        int alloc_spec = 0, nr_spec = 0, i;
 758
 759        do {
 760                if (!prefixcmp(buf->buf, "push ")) {
 761                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 762                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 763                }
 764                else
 765                        die("http transport does not support %s", buf->buf);
 766
 767                strbuf_reset(buf);
 768                if (strbuf_getline(buf, stdin, '\n') == EOF)
 769                        return;
 770                if (!*buf->buf)
 771                        break;
 772        } while (1);
 773
 774        if (push(nr_spec, specs))
 775                exit(128); /* error already reported */
 776        for (i = 0; i < nr_spec; i++)
 777                free(specs[i]);
 778        free(specs);
 779
 780        printf("\n");
 781        fflush(stdout);
 782}
 783
 784int main(int argc, const char **argv)
 785{
 786        struct strbuf buf = STRBUF_INIT;
 787        int nongit;
 788
 789        git_extract_argv0_path(argv[0]);
 790        setup_git_directory_gently(&nongit);
 791        if (argc < 2) {
 792                fprintf(stderr, "Remote needed\n");
 793                return 1;
 794        }
 795
 796        options.verbosity = 1;
 797        options.progress = !!isatty(2);
 798        options.thin = 1;
 799
 800        remote = remote_get(argv[1]);
 801
 802        if (argc > 2) {
 803                end_url_with_slash(&buf, argv[2]);
 804        } else {
 805                end_url_with_slash(&buf, remote->url[0]);
 806        }
 807
 808        url = strbuf_detach(&buf, NULL);
 809
 810        http_init(remote);
 811
 812        do {
 813                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 814                        break;
 815                if (!prefixcmp(buf.buf, "fetch ")) {
 816                        if (nongit)
 817                                die("Fetch attempted without a local repo");
 818                        parse_fetch(&buf);
 819
 820                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 821                        int for_push = !!strstr(buf.buf + 4, "for-push");
 822                        output_refs(get_refs(for_push));
 823
 824                } else if (!prefixcmp(buf.buf, "push ")) {
 825                        parse_push(&buf);
 826
 827                } else if (!prefixcmp(buf.buf, "option ")) {
 828                        char *name = buf.buf + strlen("option ");
 829                        char *value = strchr(name, ' ');
 830                        int result;
 831
 832                        if (value)
 833                                *value++ = '\0';
 834                        else
 835                                value = "true";
 836
 837                        result = set_option(name, value);
 838                        if (!result)
 839                                printf("ok\n");
 840                        else if (result < 0)
 841                                printf("error invalid value\n");
 842                        else
 843                                printf("unsupported\n");
 844                        fflush(stdout);
 845
 846                } else if (!strcmp(buf.buf, "capabilities")) {
 847                        printf("fetch\n");
 848                        printf("option\n");
 849                        printf("push\n");
 850                        printf("\n");
 851                        fflush(stdout);
 852                } else {
 853                        return 1;
 854                }
 855                strbuf_reset(&buf);
 856        } while (1);
 857
 858        http_cleanup();
 859
 860        return 0;
 861}