Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit tests: factor out terminal handling from t7006 (cc4e48f)
   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
 532        close(client.in);
 533        client.in = -1;
 534        strbuf_read(&rpc->result, client.out, 0);
 535
 536        close(client.out);
 537        client.out = -1;
 538
 539        err |= finish_command(&client);
 540        free(rpc->service_url);
 541        free(rpc->hdr_content_type);
 542        free(rpc->hdr_accept);
 543        free(rpc->buf);
 544        strbuf_release(&buf);
 545        return err;
 546}
 547
 548static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 549{
 550        struct walker *walker;
 551        char **targets = xmalloc(nr_heads * sizeof(char*));
 552        int ret, i;
 553
 554        if (options.depth)
 555                die("dumb http transport does not support --depth");
 556        for (i = 0; i < nr_heads; i++)
 557                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 558
 559        walker = get_http_walker(url);
 560        walker->get_all = 1;
 561        walker->get_tree = 1;
 562        walker->get_history = 1;
 563        walker->get_verbosely = options.verbosity >= 3;
 564        walker->get_recover = 0;
 565        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 566        walker_free(walker);
 567
 568        for (i = 0; i < nr_heads; i++)
 569                free(targets[i]);
 570        free(targets);
 571
 572        return ret ? error("Fetch failed.") : 0;
 573}
 574
 575static int fetch_git(struct discovery *heads,
 576        int nr_heads, struct ref **to_fetch)
 577{
 578        struct rpc_state rpc;
 579        char *depth_arg = NULL;
 580        const char **argv;
 581        int argc = 0, i, err;
 582
 583        argv = xmalloc((15 + nr_heads) * sizeof(char*));
 584        argv[argc++] = "fetch-pack";
 585        argv[argc++] = "--stateless-rpc";
 586        argv[argc++] = "--lock-pack";
 587        if (options.followtags)
 588                argv[argc++] = "--include-tag";
 589        if (options.thin)
 590                argv[argc++] = "--thin";
 591        if (options.verbosity >= 3) {
 592                argv[argc++] = "-v";
 593                argv[argc++] = "-v";
 594        }
 595        if (!options.progress)
 596                argv[argc++] = "--no-progress";
 597        if (options.depth) {
 598                struct strbuf buf = STRBUF_INIT;
 599                strbuf_addf(&buf, "--depth=%lu", options.depth);
 600                depth_arg = strbuf_detach(&buf, NULL);
 601                argv[argc++] = depth_arg;
 602        }
 603        argv[argc++] = url;
 604        for (i = 0; i < nr_heads; i++) {
 605                struct ref *ref = to_fetch[i];
 606                if (!ref->name || !*ref->name)
 607                        die("cannot fetch by sha1 over smart http");
 608                argv[argc++] = ref->name;
 609        }
 610        argv[argc++] = NULL;
 611
 612        memset(&rpc, 0, sizeof(rpc));
 613        rpc.service_name = "git-upload-pack",
 614        rpc.argv = argv;
 615        rpc.gzip_request = 1;
 616
 617        err = rpc_service(&rpc, heads);
 618        if (rpc.result.len)
 619                safe_write(1, rpc.result.buf, rpc.result.len);
 620        strbuf_release(&rpc.result);
 621        free(argv);
 622        free(depth_arg);
 623        return err;
 624}
 625
 626static int fetch(int nr_heads, struct ref **to_fetch)
 627{
 628        struct discovery *d = discover_refs("git-upload-pack");
 629        if (d->proto_git)
 630                return fetch_git(d, nr_heads, to_fetch);
 631        else
 632                return fetch_dumb(nr_heads, to_fetch);
 633}
 634
 635static void parse_fetch(struct strbuf *buf)
 636{
 637        struct ref **to_fetch = NULL;
 638        struct ref *list_head = NULL;
 639        struct ref **list = &list_head;
 640        int alloc_heads = 0, nr_heads = 0;
 641
 642        do {
 643                if (!prefixcmp(buf->buf, "fetch ")) {
 644                        char *p = buf->buf + strlen("fetch ");
 645                        char *name;
 646                        struct ref *ref;
 647                        unsigned char old_sha1[20];
 648
 649                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 650                                die("protocol error: expected sha/ref, got %s'", p);
 651                        if (p[40] == ' ')
 652                                name = p + 41;
 653                        else if (!p[40])
 654                                name = "";
 655                        else
 656                                die("protocol error: expected sha/ref, got %s'", p);
 657
 658                        ref = alloc_ref(name);
 659                        hashcpy(ref->old_sha1, old_sha1);
 660
 661                        *list = ref;
 662                        list = &ref->next;
 663
 664                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 665                        to_fetch[nr_heads++] = ref;
 666                }
 667                else
 668                        die("http transport does not support %s", buf->buf);
 669
 670                strbuf_reset(buf);
 671                if (strbuf_getline(buf, stdin, '\n') == EOF)
 672                        return;
 673                if (!*buf->buf)
 674                        break;
 675        } while (1);
 676
 677        if (fetch(nr_heads, to_fetch))
 678                exit(128); /* error already reported */
 679        free_refs(list_head);
 680        free(to_fetch);
 681
 682        printf("\n");
 683        fflush(stdout);
 684        strbuf_reset(buf);
 685}
 686
 687static int push_dav(int nr_spec, char **specs)
 688{
 689        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 690        int argc = 0, i;
 691
 692        argv[argc++] = "http-push";
 693        argv[argc++] = "--helper-status";
 694        if (options.dry_run)
 695                argv[argc++] = "--dry-run";
 696        if (options.verbosity > 1)
 697                argv[argc++] = "--verbose";
 698        argv[argc++] = url;
 699        for (i = 0; i < nr_spec; i++)
 700                argv[argc++] = specs[i];
 701        argv[argc++] = NULL;
 702
 703        if (run_command_v_opt(argv, RUN_GIT_CMD))
 704                die("git-%s failed", argv[0]);
 705        free(argv);
 706        return 0;
 707}
 708
 709static int push_git(struct discovery *heads, int nr_spec, char **specs)
 710{
 711        struct rpc_state rpc;
 712        const char **argv;
 713        int argc = 0, i, err;
 714
 715        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 716        argv[argc++] = "send-pack";
 717        argv[argc++] = "--stateless-rpc";
 718        argv[argc++] = "--helper-status";
 719        if (options.thin)
 720                argv[argc++] = "--thin";
 721        if (options.dry_run)
 722                argv[argc++] = "--dry-run";
 723        if (options.verbosity > 1)
 724                argv[argc++] = "--verbose";
 725        argv[argc++] = url;
 726        for (i = 0; i < nr_spec; i++)
 727                argv[argc++] = specs[i];
 728        argv[argc++] = NULL;
 729
 730        memset(&rpc, 0, sizeof(rpc));
 731        rpc.service_name = "git-receive-pack",
 732        rpc.argv = argv;
 733
 734        err = rpc_service(&rpc, heads);
 735        if (rpc.result.len)
 736                safe_write(1, rpc.result.buf, rpc.result.len);
 737        strbuf_release(&rpc.result);
 738        free(argv);
 739        return err;
 740}
 741
 742static int push(int nr_spec, char **specs)
 743{
 744        struct discovery *heads = discover_refs("git-receive-pack");
 745        int ret;
 746
 747        if (heads->proto_git)
 748                ret = push_git(heads, nr_spec, specs);
 749        else
 750                ret = push_dav(nr_spec, specs);
 751        free_discovery(heads);
 752        return ret;
 753}
 754
 755static void parse_push(struct strbuf *buf)
 756{
 757        char **specs = NULL;
 758        int alloc_spec = 0, nr_spec = 0, i;
 759
 760        do {
 761                if (!prefixcmp(buf->buf, "push ")) {
 762                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 763                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 764                }
 765                else
 766                        die("http transport does not support %s", buf->buf);
 767
 768                strbuf_reset(buf);
 769                if (strbuf_getline(buf, stdin, '\n') == EOF)
 770                        return;
 771                if (!*buf->buf)
 772                        break;
 773        } while (1);
 774
 775        if (push(nr_spec, specs))
 776                exit(128); /* error already reported */
 777        for (i = 0; i < nr_spec; i++)
 778                free(specs[i]);
 779        free(specs);
 780
 781        printf("\n");
 782        fflush(stdout);
 783}
 784
 785int main(int argc, const char **argv)
 786{
 787        struct strbuf buf = STRBUF_INIT;
 788        int nongit;
 789
 790        git_extract_argv0_path(argv[0]);
 791        setup_git_directory_gently(&nongit);
 792        if (argc < 2) {
 793                fprintf(stderr, "Remote needed\n");
 794                return 1;
 795        }
 796
 797        options.verbosity = 1;
 798        options.progress = !!isatty(2);
 799        options.thin = 1;
 800
 801        remote = remote_get(argv[1]);
 802
 803        if (argc > 2) {
 804                end_url_with_slash(&buf, argv[2]);
 805        } else {
 806                end_url_with_slash(&buf, remote->url[0]);
 807        }
 808
 809        url = strbuf_detach(&buf, NULL);
 810
 811        http_init(remote);
 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
 859        http_cleanup();
 860
 861        return 0;
 862}