Andrew's git / gitweb.git / remote-curl.c
?
remote-curl.con commit work around an obnoxious bash "safety feature" on OpenBSD (3fa7c3d)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "sideband.h"
  10
  11static struct remote *remote;
  12static const char *url;
  13static struct walker *walker;
  14
  15struct options {
  16        int verbosity;
  17        unsigned long depth;
  18        unsigned progress : 1,
  19                followtags : 1,
  20                dry_run : 1,
  21                thin : 1;
  22};
  23static struct options options;
  24
  25static void init_walker(void)
  26{
  27        if (!walker)
  28                walker = get_http_walker(url, remote);
  29}
  30
  31static int set_option(const char *name, const char *value)
  32{
  33        if (!strcmp(name, "verbosity")) {
  34                char *end;
  35                int v = strtol(value, &end, 10);
  36                if (value == end || *end)
  37                        return -1;
  38                options.verbosity = v;
  39                return 0;
  40        }
  41        else if (!strcmp(name, "progress")) {
  42                if (!strcmp(value, "true"))
  43                        options.progress = 1;
  44                else if (!strcmp(value, "false"))
  45                        options.progress = 0;
  46                else
  47                        return -1;
  48                return 0;
  49        }
  50        else if (!strcmp(name, "depth")) {
  51                char *end;
  52                unsigned long v = strtoul(value, &end, 10);
  53                if (value == end || *end)
  54                        return -1;
  55                options.depth = v;
  56                return 0;
  57        }
  58        else if (!strcmp(name, "followtags")) {
  59                if (!strcmp(value, "true"))
  60                        options.followtags = 1;
  61                else if (!strcmp(value, "false"))
  62                        options.followtags = 0;
  63                else
  64                        return -1;
  65                return 0;
  66        }
  67        else if (!strcmp(name, "dry-run")) {
  68                if (!strcmp(value, "true"))
  69                        options.dry_run = 1;
  70                else if (!strcmp(value, "false"))
  71                        options.dry_run = 0;
  72                else
  73                        return -1;
  74                return 0;
  75        }
  76        else {
  77                return 1 /* unsupported */;
  78        }
  79}
  80
  81struct discovery {
  82        const char *service;
  83        char *buf_alloc;
  84        char *buf;
  85        size_t len;
  86        unsigned proto_git : 1;
  87};
  88static struct discovery *last_discovery;
  89
  90static void free_discovery(struct discovery *d)
  91{
  92        if (d) {
  93                if (d == last_discovery)
  94                        last_discovery = NULL;
  95                free(d->buf_alloc);
  96                free(d);
  97        }
  98}
  99
 100static struct discovery* discover_refs(const char *service)
 101{
 102        struct strbuf buffer = STRBUF_INIT;
 103        struct discovery *last = last_discovery;
 104        char *refs_url;
 105        int http_ret, is_http = 0, proto_git_candidate = 1;
 106
 107        if (last && !strcmp(service, last->service))
 108                return last;
 109        free_discovery(last);
 110
 111        strbuf_addf(&buffer, "%s/info/refs", url);
 112        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 113                is_http = 1;
 114                if (!strchr(url, '?'))
 115                        strbuf_addch(&buffer, '?');
 116                else
 117                        strbuf_addch(&buffer, '&');
 118                strbuf_addf(&buffer, "service=%s", service);
 119        }
 120        refs_url = strbuf_detach(&buffer, NULL);
 121
 122        init_walker();
 123        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 124
 125        /* try again with "plain" url (no ? or & appended) */
 126        if (http_ret != HTTP_OK) {
 127                free(refs_url);
 128                strbuf_reset(&buffer);
 129
 130                proto_git_candidate = 0;
 131                strbuf_addf(&buffer, "%s/info/refs", url);
 132                refs_url = strbuf_detach(&buffer, NULL);
 133
 134                http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 135        }
 136
 137        switch (http_ret) {
 138        case HTTP_OK:
 139                break;
 140        case HTTP_MISSING_TARGET:
 141                die("%s not found: did you run git update-server-info on the"
 142                    " server?", refs_url);
 143        default:
 144                http_error(refs_url, http_ret);
 145                die("HTTP request failed");
 146        }
 147
 148        last= xcalloc(1, sizeof(*last_discovery));
 149        last->service = service;
 150        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 151        last->buf = last->buf_alloc;
 152
 153        if (is_http && proto_git_candidate
 154                && 5 <= last->len && last->buf[4] == '#') {
 155                /* smart HTTP response; validate that the service
 156                 * pkt-line matches our request.
 157                 */
 158                struct strbuf exp = STRBUF_INIT;
 159
 160                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 161                        die("%s has invalid packet header", refs_url);
 162                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 163                        strbuf_setlen(&buffer, buffer.len - 1);
 164
 165                strbuf_addf(&exp, "# service=%s", service);
 166                if (strbuf_cmp(&exp, &buffer))
 167                        die("invalid server response; got '%s'", buffer.buf);
 168                strbuf_release(&exp);
 169
 170                /* The header can include additional metadata lines, up
 171                 * until a packet flush marker.  Ignore these now, but
 172                 * in the future we might start to scan them.
 173                 */
 174                strbuf_reset(&buffer);
 175                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 176                        strbuf_reset(&buffer);
 177
 178                last->proto_git = 1;
 179        }
 180
 181        free(refs_url);
 182        strbuf_release(&buffer);
 183        last_discovery = last;
 184        return last;
 185}
 186
 187static int write_discovery(int 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        init_walker();
 253        ref = alloc_ref("HEAD");
 254        if (!walker->fetch_ref(walker, ref) &&
 255            !resolve_remote_symref(ref, refs)) {
 256                ref->next = refs;
 257                refs = ref;
 258        } else {
 259                free(ref);
 260        }
 261
 262        return refs;
 263}
 264
 265static struct ref *get_refs(int for_push)
 266{
 267        struct discovery *heads;
 268
 269        if (for_push)
 270                heads = discover_refs("git-receive-pack");
 271        else
 272                heads = discover_refs("git-upload-pack");
 273
 274        if (heads->proto_git)
 275                return parse_git_refs(heads);
 276        return parse_info_refs(heads);
 277}
 278
 279static void output_refs(struct ref *refs)
 280{
 281        struct ref *posn;
 282        for (posn = refs; posn; posn = posn->next) {
 283                if (posn->symref)
 284                        printf("@%s %s\n", posn->symref, posn->name);
 285                else
 286                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 287        }
 288        printf("\n");
 289        fflush(stdout);
 290        free_refs(refs);
 291}
 292
 293struct rpc_state {
 294        const char *service_name;
 295        const char **argv;
 296        char *service_url;
 297        char *hdr_content_type;
 298        char *hdr_accept;
 299        char *buf;
 300        size_t alloc;
 301        size_t len;
 302        size_t pos;
 303        int in;
 304        int out;
 305        struct strbuf result;
 306        unsigned gzip_request : 1;
 307        unsigned initial_buffer : 1;
 308};
 309
 310static size_t rpc_out(void *ptr, size_t eltsize,
 311                size_t nmemb, void *buffer_)
 312{
 313        size_t max = eltsize * nmemb;
 314        struct rpc_state *rpc = buffer_;
 315        size_t avail = rpc->len - rpc->pos;
 316
 317        if (!avail) {
 318                rpc->initial_buffer = 0;
 319                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 320                if (!avail)
 321                        return 0;
 322                rpc->pos = 0;
 323                rpc->len = avail;
 324        }
 325
 326        if (max < avail)
 327                avail = max;
 328        memcpy(ptr, rpc->buf + rpc->pos, avail);
 329        rpc->pos += avail;
 330        return avail;
 331}
 332
 333#ifndef NO_CURL_IOCTL
 334static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 335{
 336        struct rpc_state *rpc = clientp;
 337
 338        switch (cmd) {
 339        case CURLIOCMD_NOP:
 340                return CURLIOE_OK;
 341
 342        case CURLIOCMD_RESTARTREAD:
 343                if (rpc->initial_buffer) {
 344                        rpc->pos = 0;
 345                        return CURLIOE_OK;
 346                }
 347                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 348                return CURLIOE_FAILRESTART;
 349
 350        default:
 351                return CURLIOE_UNKNOWNCMD;
 352        }
 353}
 354#endif
 355
 356static size_t rpc_in(const void *ptr, size_t eltsize,
 357                size_t nmemb, void *buffer_)
 358{
 359        size_t size = eltsize * nmemb;
 360        struct rpc_state *rpc = buffer_;
 361        write_or_die(rpc->in, ptr, size);
 362        return size;
 363}
 364
 365static int post_rpc(struct rpc_state *rpc)
 366{
 367        struct active_request_slot *slot;
 368        struct slot_results results;
 369        struct curl_slist *headers = NULL;
 370        int use_gzip = rpc->gzip_request;
 371        char *gzip_body = NULL;
 372        int err = 0, large_request = 0;
 373
 374        /* Try to load the entire request, if we can fit it into the
 375         * allocated buffer space we can use HTTP/1.0 and avoid the
 376         * chunked encoding mess.
 377         */
 378        while (1) {
 379                size_t left = rpc->alloc - rpc->len;
 380                char *buf = rpc->buf + rpc->len;
 381                int n;
 382
 383                if (left < LARGE_PACKET_MAX) {
 384                        large_request = 1;
 385                        use_gzip = 0;
 386                        break;
 387                }
 388
 389                n = packet_read_line(rpc->out, buf, left);
 390                if (!n)
 391                        break;
 392                rpc->len += n;
 393        }
 394
 395        slot = get_active_slot();
 396        slot->results = &results;
 397
 398        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 399        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 400        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 401        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
 402
 403        headers = curl_slist_append(headers, rpc->hdr_content_type);
 404        headers = curl_slist_append(headers, rpc->hdr_accept);
 405
 406        if (large_request) {
 407                /* The request body is large and the size cannot be predicted.
 408                 * We must use chunked encoding to send it.
 409                 */
 410                headers = curl_slist_append(headers, "Expect: 100-continue");
 411                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 412                rpc->initial_buffer = 1;
 413                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 414                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 415#ifndef NO_CURL_IOCTL
 416                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 417                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 418#endif
 419                if (options.verbosity > 1) {
 420                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 421                        fflush(stderr);
 422                }
 423
 424        } else if (use_gzip && 1024 < rpc->len) {
 425                /* The client backend isn't giving us compressed data so
 426                 * we can try to deflate it ourselves, this may save on.
 427                 * the transfer time.
 428                 */
 429                size_t size;
 430                z_stream stream;
 431                int ret;
 432
 433                memset(&stream, 0, sizeof(stream));
 434                ret = deflateInit2(&stream, Z_BEST_COMPRESSION,
 435                                Z_DEFLATED, (15 + 16),
 436                                8, Z_DEFAULT_STRATEGY);
 437                if (ret != Z_OK)
 438                        die("cannot deflate request; zlib init error %d", ret);
 439                size = deflateBound(&stream, rpc->len);
 440                gzip_body = xmalloc(size);
 441
 442                stream.next_in = (unsigned char *)rpc->buf;
 443                stream.avail_in = rpc->len;
 444                stream.next_out = (unsigned char *)gzip_body;
 445                stream.avail_out = size;
 446
 447                ret = deflate(&stream, Z_FINISH);
 448                if (ret != Z_STREAM_END)
 449                        die("cannot deflate request; zlib deflate error %d", ret);
 450
 451                ret = deflateEnd(&stream);
 452                if (ret != Z_OK)
 453                        die("cannot deflate request; zlib end error %d", ret);
 454
 455                size = stream.total_out;
 456
 457                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 458                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 459                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 460
 461                if (options.verbosity > 1) {
 462                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 463                                rpc->service_name,
 464                                (unsigned long)rpc->len, (unsigned long)size);
 465                        fflush(stderr);
 466                }
 467        } else {
 468                /* We know the complete request size in advance, use the
 469                 * more normal Content-Length approach.
 470                 */
 471                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 472                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 473                if (options.verbosity > 1) {
 474                        fprintf(stderr, "POST %s (%lu bytes)\n",
 475                                rpc->service_name, (unsigned long)rpc->len);
 476                        fflush(stderr);
 477                }
 478        }
 479
 480        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 481        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 482        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 483
 484        slot->curl_result = curl_easy_perform(slot->curl);
 485        finish_active_slot(slot);
 486
 487        if (results.curl_result != CURLE_OK) {
 488                err |= error("RPC failed; result=%d, HTTP code = %ld",
 489                        results.curl_result, results.http_code);
 490        }
 491
 492        curl_slist_free_all(headers);
 493        free(gzip_body);
 494        return err;
 495}
 496
 497static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 498{
 499        const char *svc = rpc->service_name;
 500        struct strbuf buf = STRBUF_INIT;
 501        struct child_process client;
 502        int err = 0;
 503
 504        init_walker();
 505        memset(&client, 0, sizeof(client));
 506        client.in = -1;
 507        client.out = -1;
 508        client.git_cmd = 1;
 509        client.argv = rpc->argv;
 510        if (start_command(&client))
 511                exit(1);
 512        if (heads)
 513                write_or_die(client.in, heads->buf, heads->len);
 514
 515        rpc->alloc = http_post_buffer;
 516        rpc->buf = xmalloc(rpc->alloc);
 517        rpc->in = client.in;
 518        rpc->out = client.out;
 519        strbuf_init(&rpc->result, 0);
 520
 521        strbuf_addf(&buf, "%s/%s", url, svc);
 522        rpc->service_url = strbuf_detach(&buf, NULL);
 523
 524        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 525        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 526
 527        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 528        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 529
 530        while (!err) {
 531                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 532                if (!n)
 533                        break;
 534                rpc->pos = 0;
 535                rpc->len = n;
 536                err |= post_rpc(rpc);
 537        }
 538        strbuf_read(&rpc->result, client.out, 0);
 539
 540        close(client.in);
 541        close(client.out);
 542        client.in = -1;
 543        client.out = -1;
 544
 545        err |= finish_command(&client);
 546        free(rpc->service_url);
 547        free(rpc->hdr_content_type);
 548        free(rpc->hdr_accept);
 549        free(rpc->buf);
 550        strbuf_release(&buf);
 551        return err;
 552}
 553
 554static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 555{
 556        char **targets = xmalloc(nr_heads * sizeof(char*));
 557        int ret, i;
 558
 559        if (options.depth)
 560                die("dumb http transport does not support --depth");
 561        for (i = 0; i < nr_heads; i++)
 562                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 563
 564        init_walker();
 565        walker->get_all = 1;
 566        walker->get_tree = 1;
 567        walker->get_history = 1;
 568        walker->get_verbosely = options.verbosity >= 3;
 569        walker->get_recover = 0;
 570        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 571
 572        for (i = 0; i < nr_heads; i++)
 573                free(targets[i]);
 574        free(targets);
 575
 576        return ret ? error("Fetch failed.") : 0;
 577}
 578
 579static int fetch_git(struct discovery *heads,
 580        int nr_heads, struct ref **to_fetch)
 581{
 582        struct rpc_state rpc;
 583        char *depth_arg = NULL;
 584        const char **argv;
 585        int argc = 0, i, err;
 586
 587        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 588        argv[argc++] = "fetch-pack";
 589        argv[argc++] = "--stateless-rpc";
 590        argv[argc++] = "--lock-pack";
 591        if (options.followtags)
 592                argv[argc++] = "--include-tag";
 593        if (options.thin)
 594                argv[argc++] = "--thin";
 595        if (options.verbosity >= 3) {
 596                argv[argc++] = "-v";
 597                argv[argc++] = "-v";
 598        }
 599        if (!options.progress)
 600                argv[argc++] = "--no-progress";
 601        if (options.depth) {
 602                struct strbuf buf = STRBUF_INIT;
 603                strbuf_addf(&buf, "--depth=%lu", options.depth);
 604                depth_arg = strbuf_detach(&buf, NULL);
 605                argv[argc++] = depth_arg;
 606        }
 607        argv[argc++] = url;
 608        for (i = 0; i < nr_heads; i++) {
 609                struct ref *ref = to_fetch[i];
 610                if (!ref->name || !*ref->name)
 611                        die("cannot fetch by sha1 over smart http");
 612                argv[argc++] = ref->name;
 613        }
 614        argv[argc++] = NULL;
 615
 616        memset(&rpc, 0, sizeof(rpc));
 617        rpc.service_name = "git-upload-pack",
 618        rpc.argv = argv;
 619        rpc.gzip_request = 1;
 620
 621        err = rpc_service(&rpc, heads);
 622        if (rpc.result.len)
 623                safe_write(1, rpc.result.buf, rpc.result.len);
 624        strbuf_release(&rpc.result);
 625        free(argv);
 626        free(depth_arg);
 627        return err;
 628}
 629
 630static int fetch(int nr_heads, struct ref **to_fetch)
 631{
 632        struct discovery *d = discover_refs("git-upload-pack");
 633        if (d->proto_git)
 634                return fetch_git(d, nr_heads, to_fetch);
 635        else
 636                return fetch_dumb(nr_heads, to_fetch);
 637}
 638
 639static void parse_fetch(struct strbuf *buf)
 640{
 641        struct ref **to_fetch = NULL;
 642        struct ref *list_head = NULL;
 643        struct ref **list = &list_head;
 644        int alloc_heads = 0, nr_heads = 0;
 645
 646        do {
 647                if (!prefixcmp(buf->buf, "fetch ")) {
 648                        char *p = buf->buf + strlen("fetch ");
 649                        char *name;
 650                        struct ref *ref;
 651                        unsigned char old_sha1[20];
 652
 653                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 654                                die("protocol error: expected sha/ref, got %s'", p);
 655                        if (p[40] == ' ')
 656                                name = p + 41;
 657                        else if (!p[40])
 658                                name = "";
 659                        else
 660                                die("protocol error: expected sha/ref, got %s'", p);
 661
 662                        ref = alloc_ref(name);
 663                        hashcpy(ref->old_sha1, old_sha1);
 664
 665                        *list = ref;
 666                        list = &ref->next;
 667
 668                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 669                        to_fetch[nr_heads++] = ref;
 670                }
 671                else
 672                        die("http transport does not support %s", buf->buf);
 673
 674                strbuf_reset(buf);
 675                if (strbuf_getline(buf, stdin, '\n') == EOF)
 676                        return;
 677                if (!*buf->buf)
 678                        break;
 679        } while (1);
 680
 681        if (fetch(nr_heads, to_fetch))
 682                exit(128); /* error already reported */
 683        free_refs(list_head);
 684        free(to_fetch);
 685
 686        printf("\n");
 687        fflush(stdout);
 688        strbuf_reset(buf);
 689}
 690
 691static int push_dav(int nr_spec, char **specs)
 692{
 693        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 694        int argc = 0, i;
 695
 696        argv[argc++] = "http-push";
 697        argv[argc++] = "--helper-status";
 698        if (options.dry_run)
 699                argv[argc++] = "--dry-run";
 700        if (options.verbosity > 1)
 701                argv[argc++] = "--verbose";
 702        argv[argc++] = url;
 703        for (i = 0; i < nr_spec; i++)
 704                argv[argc++] = specs[i];
 705        argv[argc++] = NULL;
 706
 707        if (run_command_v_opt(argv, RUN_GIT_CMD))
 708                die("git-%s failed", argv[0]);
 709        free(argv);
 710        return 0;
 711}
 712
 713static int push_git(struct discovery *heads, int nr_spec, char **specs)
 714{
 715        struct rpc_state rpc;
 716        const char **argv;
 717        int argc = 0, i, err;
 718
 719        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 720        argv[argc++] = "send-pack";
 721        argv[argc++] = "--stateless-rpc";
 722        argv[argc++] = "--helper-status";
 723        if (options.thin)
 724                argv[argc++] = "--thin";
 725        if (options.dry_run)
 726                argv[argc++] = "--dry-run";
 727        if (options.verbosity > 1)
 728                argv[argc++] = "--verbose";
 729        argv[argc++] = url;
 730        for (i = 0; i < nr_spec; i++)
 731                argv[argc++] = specs[i];
 732        argv[argc++] = NULL;
 733
 734        memset(&rpc, 0, sizeof(rpc));
 735        rpc.service_name = "git-receive-pack",
 736        rpc.argv = argv;
 737
 738        err = rpc_service(&rpc, heads);
 739        if (rpc.result.len)
 740                safe_write(1, rpc.result.buf, rpc.result.len);
 741        strbuf_release(&rpc.result);
 742        free(argv);
 743        return err;
 744}
 745
 746static int push(int nr_spec, char **specs)
 747{
 748        struct discovery *heads = discover_refs("git-receive-pack");
 749        int ret;
 750
 751        if (heads->proto_git)
 752                ret = push_git(heads, nr_spec, specs);
 753        else
 754                ret = push_dav(nr_spec, specs);
 755        free_discovery(heads);
 756        return ret;
 757}
 758
 759static void parse_push(struct strbuf *buf)
 760{
 761        char **specs = NULL;
 762        int alloc_spec = 0, nr_spec = 0, i;
 763
 764        do {
 765                if (!prefixcmp(buf->buf, "push ")) {
 766                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 767                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 768                }
 769                else
 770                        die("http transport does not support %s", buf->buf);
 771
 772                strbuf_reset(buf);
 773                if (strbuf_getline(buf, stdin, '\n') == EOF)
 774                        return;
 775                if (!*buf->buf)
 776                        break;
 777        } while (1);
 778
 779        if (push(nr_spec, specs))
 780                exit(128); /* error already reported */
 781        for (i = 0; i < nr_spec; i++)
 782                free(specs[i]);
 783        free(specs);
 784
 785        printf("\n");
 786        fflush(stdout);
 787}
 788
 789int main(int argc, const char **argv)
 790{
 791        struct strbuf buf = STRBUF_INIT;
 792        int nongit;
 793
 794        git_extract_argv0_path(argv[0]);
 795        setup_git_directory_gently(&nongit);
 796        if (argc < 2) {
 797                fprintf(stderr, "Remote needed\n");
 798                return 1;
 799        }
 800
 801        options.verbosity = 1;
 802        options.progress = !!isatty(2);
 803        options.thin = 1;
 804
 805        remote = remote_get(argv[1]);
 806
 807        if (argc > 2) {
 808                url = argv[2];
 809        } else {
 810                url = remote->url[0];
 811        }
 812
 813        do {
 814                if (strbuf_getline(&buf, stdin, '\n') == EOF)
 815                        break;
 816                if (!prefixcmp(buf.buf, "fetch ")) {
 817                        if (nongit)
 818                                die("Fetch attempted without a local repo");
 819                        parse_fetch(&buf);
 820
 821                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 822                        int for_push = !!strstr(buf.buf + 4, "for-push");
 823                        output_refs(get_refs(for_push));
 824
 825                } else if (!prefixcmp(buf.buf, "push ")) {
 826                        parse_push(&buf);
 827
 828                } else if (!prefixcmp(buf.buf, "option ")) {
 829                        char *name = buf.buf + strlen("option ");
 830                        char *value = strchr(name, ' ');
 831                        int result;
 832
 833                        if (value)
 834                                *value++ = '\0';
 835                        else
 836                                value = "true";
 837
 838                        result = set_option(name, value);
 839                        if (!result)
 840                                printf("ok\n");
 841                        else if (result < 0)
 842                                printf("error invalid value\n");
 843                        else
 844                                printf("unsupported\n");
 845                        fflush(stdout);
 846
 847                } else if (!strcmp(buf.buf, "capabilities")) {
 848                        printf("fetch\n");
 849                        printf("option\n");
 850                        printf("push\n");
 851                        printf("\n");
 852                        fflush(stdout);
 853                } else {
 854                        return 1;
 855                }
 856                strbuf_reset(&buf);
 857        } while (1);
 858        return 0;
 859}