Andrew's git - gitweb.git/blob

9ad347159e72af125cd553c7e77693207e80bfa5
   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#include "argv-array.h"
  11
  12static struct remote *remote;
  13static const char *url; /* always ends with a trailing slash */
  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 int set_option(const char *name, const char *value)
  26{
  27        if (!strcmp(name, "verbosity")) {
  28                char *end;
  29                int v = strtol(value, &end, 10);
  30                if (value == end || *end)
  31                        return -1;
  32                options.verbosity = v;
  33                return 0;
  34        }
  35        else if (!strcmp(name, "progress")) {
  36                if (!strcmp(value, "true"))
  37                        options.progress = 1;
  38                else if (!strcmp(value, "false"))
  39                        options.progress = 0;
  40                else
  41                        return -1;
  42                return 0;
  43        }
  44        else if (!strcmp(name, "depth")) {
  45                char *end;
  46                unsigned long v = strtoul(value, &end, 10);
  47                if (value == end || *end)
  48                        return -1;
  49                options.depth = v;
  50                return 0;
  51        }
  52        else if (!strcmp(name, "followtags")) {
  53                if (!strcmp(value, "true"))
  54                        options.followtags = 1;
  55                else if (!strcmp(value, "false"))
  56                        options.followtags = 0;
  57                else
  58                        return -1;
  59                return 0;
  60        }
  61        else if (!strcmp(name, "dry-run")) {
  62                if (!strcmp(value, "true"))
  63                        options.dry_run = 1;
  64                else if (!strcmp(value, "false"))
  65                        options.dry_run = 0;
  66                else
  67                        return -1;
  68                return 0;
  69        }
  70        else {
  71                return 1 /* unsupported */;
  72        }
  73}
  74
  75struct discovery {
  76        const char *service;
  77        char *buf_alloc;
  78        char *buf;
  79        size_t len;
  80        struct ref *refs;
  81        unsigned proto_git : 1;
  82};
  83static struct discovery *last_discovery;
  84
  85static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  86{
  87        struct ref *list = NULL;
  88        get_remote_heads(-1, heads->buf, heads->len, &list,
  89                         for_push ? REF_NORMAL : 0, NULL);
  90        return list;
  91}
  92
  93static struct ref *parse_info_refs(struct discovery *heads)
  94{
  95        char *data, *start, *mid;
  96        char *ref_name;
  97        int i = 0;
  98
  99        struct ref *refs = NULL;
 100        struct ref *ref = NULL;
 101        struct ref *last_ref = NULL;
 102
 103        data = heads->buf;
 104        start = NULL;
 105        mid = data;
 106        while (i < heads->len) {
 107                if (!start) {
 108                        start = &data[i];
 109                }
 110                if (data[i] == '\t')
 111                        mid = &data[i];
 112                if (data[i] == '\n') {
 113                        if (mid - start != 40)
 114                                die("%sinfo/refs not valid: is this a git repository?", url);
 115                        data[i] = 0;
 116                        ref_name = mid + 1;
 117                        ref = xmalloc(sizeof(struct ref) +
 118                                      strlen(ref_name) + 1);
 119                        memset(ref, 0, sizeof(struct ref));
 120                        strcpy(ref->name, ref_name);
 121                        get_sha1_hex(start, ref->old_sha1);
 122                        if (!refs)
 123                                refs = ref;
 124                        if (last_ref)
 125                                last_ref->next = ref;
 126                        last_ref = ref;
 127                        start = NULL;
 128                }
 129                i++;
 130        }
 131
 132        ref = alloc_ref("HEAD");
 133        if (!http_fetch_ref(url, ref) &&
 134            !resolve_remote_symref(ref, refs)) {
 135                ref->next = refs;
 136                refs = ref;
 137        } else {
 138                free(ref);
 139        }
 140
 141        return refs;
 142}
 143
 144static void free_discovery(struct discovery *d)
 145{
 146        if (d) {
 147                if (d == last_discovery)
 148                        last_discovery = NULL;
 149                free(d->buf_alloc);
 150                free_refs(d->refs);
 151                free(d);
 152        }
 153}
 154
 155static int show_http_message(struct strbuf *type, struct strbuf *msg)
 156{
 157        const char *p, *eol;
 158
 159        /*
 160         * We only show text/plain parts, as other types are likely
 161         * to be ugly to look at on the user's terminal.
 162         *
 163         * TODO should handle "; charset=XXX", and re-encode into
 164         * logoutputencoding
 165         */
 166        if (strcasecmp(type->buf, "text/plain"))
 167                return -1;
 168
 169        strbuf_trim(msg);
 170        if (!msg->len)
 171                return -1;
 172
 173        p = msg->buf;
 174        do {
 175                eol = strchrnul(p, '\n');
 176                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 177                p = eol + 1;
 178        } while(*eol);
 179        return 0;
 180}
 181
 182static struct discovery* discover_refs(const char *service, int for_push)
 183{
 184        struct strbuf exp = STRBUF_INIT;
 185        struct strbuf type = STRBUF_INIT;
 186        struct strbuf buffer = STRBUF_INIT;
 187        struct discovery *last = last_discovery;
 188        char *refs_url;
 189        int http_ret, maybe_smart = 0;
 190
 191        if (last && !strcmp(service, last->service))
 192                return last;
 193        free_discovery(last);
 194
 195        strbuf_addf(&buffer, "%sinfo/refs", url);
 196        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 197             git_env_bool("GIT_SMART_HTTP", 1)) {
 198                maybe_smart = 1;
 199                if (!strchr(url, '?'))
 200                        strbuf_addch(&buffer, '?');
 201                else
 202                        strbuf_addch(&buffer, '&');
 203                strbuf_addf(&buffer, "service=%s", service);
 204        }
 205        refs_url = strbuf_detach(&buffer, NULL);
 206
 207        http_ret = http_get_strbuf(refs_url, &type, &buffer,
 208                                   HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 209        switch (http_ret) {
 210        case HTTP_OK:
 211                break;
 212        case HTTP_MISSING_TARGET:
 213                show_http_message(&type, &buffer);
 214                die("repository '%s' not found", url);
 215        case HTTP_NOAUTH:
 216                show_http_message(&type, &buffer);
 217                die("Authentication failed for '%s'", url);
 218        default:
 219                show_http_message(&type, &buffer);
 220                die("unable to access '%s': %s", url, curl_errorstr);
 221        }
 222
 223        last= xcalloc(1, sizeof(*last_discovery));
 224        last->service = service;
 225        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 226        last->buf = last->buf_alloc;
 227
 228        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 229        if (maybe_smart &&
 230            (5 <= last->len && last->buf[4] == '#') &&
 231            !strbuf_cmp(&exp, &type)) {
 232                char *line;
 233
 234                /*
 235                 * smart HTTP response; validate that the service
 236                 * pkt-line matches our request.
 237                 */
 238                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 239
 240                strbuf_reset(&exp);
 241                strbuf_addf(&exp, "# service=%s", service);
 242                if (strcmp(line, exp.buf))
 243                        die("invalid server response; got '%s'", line);
 244                strbuf_release(&exp);
 245
 246                /* The header can include additional metadata lines, up
 247                 * until a packet flush marker.  Ignore these now, but
 248                 * in the future we might start to scan them.
 249                 */
 250                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 251                        ;
 252
 253                last->proto_git = 1;
 254        }
 255
 256        if (last->proto_git)
 257                last->refs = parse_git_refs(last, for_push);
 258        else
 259                last->refs = parse_info_refs(last);
 260
 261        free(refs_url);
 262        strbuf_release(&exp);
 263        strbuf_release(&type);
 264        strbuf_release(&buffer);
 265        last_discovery = last;
 266        return last;
 267}
 268
 269static struct ref *get_refs(int for_push)
 270{
 271        struct discovery *heads;
 272
 273        if (for_push)
 274                heads = discover_refs("git-receive-pack", for_push);
 275        else
 276                heads = discover_refs("git-upload-pack", for_push);
 277
 278        return heads->refs;
 279}
 280
 281static void output_refs(struct ref *refs)
 282{
 283        struct ref *posn;
 284        for (posn = refs; posn; posn = posn->next) {
 285                if (posn->symref)
 286                        printf("@%s %s\n", posn->symref, posn->name);
 287                else
 288                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 289        }
 290        printf("\n");
 291        fflush(stdout);
 292}
 293
 294struct rpc_state {
 295        const char *service_name;
 296        const char **argv;
 297        struct strbuf *stdin_preamble;
 298        char *service_url;
 299        char *hdr_content_type;
 300        char *hdr_accept;
 301        char *buf;
 302        size_t alloc;
 303        size_t len;
 304        size_t pos;
 305        int in;
 306        int out;
 307        struct strbuf result;
 308        unsigned gzip_request : 1;
 309        unsigned initial_buffer : 1;
 310};
 311
 312static size_t rpc_out(void *ptr, size_t eltsize,
 313                size_t nmemb, void *buffer_)
 314{
 315        size_t max = eltsize * nmemb;
 316        struct rpc_state *rpc = buffer_;
 317        size_t avail = rpc->len - rpc->pos;
 318
 319        if (!avail) {
 320                rpc->initial_buffer = 0;
 321                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 322                if (!avail)
 323                        return 0;
 324                rpc->pos = 0;
 325                rpc->len = avail;
 326        }
 327
 328        if (max < avail)
 329                avail = max;
 330        memcpy(ptr, rpc->buf + rpc->pos, avail);
 331        rpc->pos += avail;
 332        return avail;
 333}
 334
 335#ifndef NO_CURL_IOCTL
 336static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 337{
 338        struct rpc_state *rpc = clientp;
 339
 340        switch (cmd) {
 341        case CURLIOCMD_NOP:
 342                return CURLIOE_OK;
 343
 344        case CURLIOCMD_RESTARTREAD:
 345                if (rpc->initial_buffer) {
 346                        rpc->pos = 0;
 347                        return CURLIOE_OK;
 348                }
 349                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 350                return CURLIOE_FAILRESTART;
 351
 352        default:
 353                return CURLIOE_UNKNOWNCMD;
 354        }
 355}
 356#endif
 357
 358static size_t rpc_in(char *ptr, size_t eltsize,
 359                size_t nmemb, void *buffer_)
 360{
 361        size_t size = eltsize * nmemb;
 362        struct rpc_state *rpc = buffer_;
 363        write_or_die(rpc->in, ptr, size);
 364        return size;
 365}
 366
 367static int run_slot(struct active_request_slot *slot,
 368                    struct slot_results *results)
 369{
 370        int err;
 371        struct slot_results results_buf;
 372
 373        if (!results)
 374                results = &results_buf;
 375
 376        slot->results = results;
 377        slot->curl_result = curl_easy_perform(slot->curl);
 378        finish_active_slot(slot);
 379
 380        err = handle_curl_result(results);
 381        if (err != HTTP_OK && err != HTTP_REAUTH) {
 382                error("RPC failed; result=%d, HTTP code = %ld",
 383                      results->curl_result, results->http_code);
 384        }
 385
 386        return err;
 387}
 388
 389static int probe_rpc(struct rpc_state *rpc, struct slot_results *results)
 390{
 391        struct active_request_slot *slot;
 392        struct curl_slist *headers = NULL;
 393        struct strbuf buf = STRBUF_INIT;
 394        int err;
 395
 396        slot = get_active_slot();
 397
 398        headers = curl_slist_append(headers, rpc->hdr_content_type);
 399        headers = curl_slist_append(headers, rpc->hdr_accept);
 400
 401        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 402        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 403        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 404        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 405        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 406        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 407        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 408        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 409        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 410
 411        err = run_slot(slot, results);
 412
 413        curl_slist_free_all(headers);
 414        strbuf_release(&buf);
 415        return err;
 416}
 417
 418static int post_rpc(struct rpc_state *rpc)
 419{
 420        struct active_request_slot *slot;
 421        struct curl_slist *headers = NULL;
 422        int use_gzip = rpc->gzip_request;
 423        char *gzip_body = NULL;
 424        size_t gzip_size = 0;
 425        int err, large_request = 0;
 426
 427        /* Try to load the entire request, if we can fit it into the
 428         * allocated buffer space we can use HTTP/1.0 and avoid the
 429         * chunked encoding mess.
 430         */
 431        while (1) {
 432                size_t left = rpc->alloc - rpc->len;
 433                char *buf = rpc->buf + rpc->len;
 434                int n;
 435
 436                if (left < LARGE_PACKET_MAX) {
 437                        large_request = 1;
 438                        use_gzip = 0;
 439                        break;
 440                }
 441
 442                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 443                if (!n)
 444                        break;
 445                rpc->len += n;
 446        }
 447
 448        if (large_request) {
 449                do {
 450                        err = probe_rpc(rpc, NULL);
 451                } while (err == HTTP_REAUTH);
 452                if (err != HTTP_OK)
 453                        return -1;
 454        }
 455
 456        headers = curl_slist_append(headers, rpc->hdr_content_type);
 457        headers = curl_slist_append(headers, rpc->hdr_accept);
 458        headers = curl_slist_append(headers, "Expect:");
 459
 460retry:
 461        slot = get_active_slot();
 462
 463        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 464        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 465        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 466        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 467
 468        if (large_request) {
 469                /* The request body is large and the size cannot be predicted.
 470                 * We must use chunked encoding to send it.
 471                 */
 472                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 473                rpc->initial_buffer = 1;
 474                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 475                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 476#ifndef NO_CURL_IOCTL
 477                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 478                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 479#endif
 480                if (options.verbosity > 1) {
 481                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 482                        fflush(stderr);
 483                }
 484
 485        } else if (gzip_body) {
 486                /*
 487                 * If we are looping to retry authentication, then the previous
 488                 * run will have set up the headers and gzip buffer already,
 489                 * and we just need to send it.
 490                 */
 491                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 492                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 493
 494        } else if (use_gzip && 1024 < rpc->len) {
 495                /* The client backend isn't giving us compressed data so
 496                 * we can try to deflate it ourselves, this may save on.
 497                 * the transfer time.
 498                 */
 499                git_zstream stream;
 500                int ret;
 501
 502                memset(&stream, 0, sizeof(stream));
 503                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 504                gzip_size = git_deflate_bound(&stream, rpc->len);
 505                gzip_body = xmalloc(gzip_size);
 506
 507                stream.next_in = (unsigned char *)rpc->buf;
 508                stream.avail_in = rpc->len;
 509                stream.next_out = (unsigned char *)gzip_body;
 510                stream.avail_out = gzip_size;
 511
 512                ret = git_deflate(&stream, Z_FINISH);
 513                if (ret != Z_STREAM_END)
 514                        die("cannot deflate request; zlib deflate error %d", ret);
 515
 516                ret = git_deflate_end_gently(&stream);
 517                if (ret != Z_OK)
 518                        die("cannot deflate request; zlib end error %d", ret);
 519
 520                gzip_size = stream.total_out;
 521
 522                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 523                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 524                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 525
 526                if (options.verbosity > 1) {
 527                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 528                                rpc->service_name,
 529                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 530                        fflush(stderr);
 531                }
 532        } else {
 533                /* We know the complete request size in advance, use the
 534                 * more normal Content-Length approach.
 535                 */
 536                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 537                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 538                if (options.verbosity > 1) {
 539                        fprintf(stderr, "POST %s (%lu bytes)\n",
 540                                rpc->service_name, (unsigned long)rpc->len);
 541                        fflush(stderr);
 542                }
 543        }
 544
 545        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 546        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 547        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 548
 549        err = run_slot(slot, NULL);
 550        if (err == HTTP_REAUTH && !large_request)
 551                goto retry;
 552        if (err != HTTP_OK)
 553                err = -1;
 554
 555        curl_slist_free_all(headers);
 556        free(gzip_body);
 557        return err;
 558}
 559
 560static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 561{
 562        const char *svc = rpc->service_name;
 563        struct strbuf buf = STRBUF_INIT;
 564        struct strbuf *preamble = rpc->stdin_preamble;
 565        struct child_process client;
 566        int err = 0;
 567
 568        memset(&client, 0, sizeof(client));
 569        client.in = -1;
 570        client.out = -1;
 571        client.git_cmd = 1;
 572        client.argv = rpc->argv;
 573        if (start_command(&client))
 574                exit(1);
 575        if (preamble)
 576                write_or_die(client.in, preamble->buf, preamble->len);
 577        if (heads)
 578                write_or_die(client.in, heads->buf, heads->len);
 579
 580        rpc->alloc = http_post_buffer;
 581        rpc->buf = xmalloc(rpc->alloc);
 582        rpc->in = client.in;
 583        rpc->out = client.out;
 584        strbuf_init(&rpc->result, 0);
 585
 586        strbuf_addf(&buf, "%s%s", url, svc);
 587        rpc->service_url = strbuf_detach(&buf, NULL);
 588
 589        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 590        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 591
 592        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 593        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 594
 595        while (!err) {
 596                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 597                if (!n)
 598                        break;
 599                rpc->pos = 0;
 600                rpc->len = n;
 601                err |= post_rpc(rpc);
 602        }
 603
 604        close(client.in);
 605        client.in = -1;
 606        if (!err) {
 607                strbuf_read(&rpc->result, client.out, 0);
 608        } else {
 609                char buf[4096];
 610                for (;;)
 611                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 612                                break;
 613        }
 614
 615        close(client.out);
 616        client.out = -1;
 617
 618        err |= finish_command(&client);
 619        free(rpc->service_url);
 620        free(rpc->hdr_content_type);
 621        free(rpc->hdr_accept);
 622        free(rpc->buf);
 623        strbuf_release(&buf);
 624        return err;
 625}
 626
 627static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 628{
 629        struct walker *walker;
 630        char **targets = xmalloc(nr_heads * sizeof(char*));
 631        int ret, i;
 632
 633        if (options.depth)
 634                die("dumb http transport does not support --depth");
 635        for (i = 0; i < nr_heads; i++)
 636                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 637
 638        walker = get_http_walker(url);
 639        walker->get_all = 1;
 640        walker->get_tree = 1;
 641        walker->get_history = 1;
 642        walker->get_verbosely = options.verbosity >= 3;
 643        walker->get_recover = 0;
 644        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 645        walker_free(walker);
 646
 647        for (i = 0; i < nr_heads; i++)
 648                free(targets[i]);
 649        free(targets);
 650
 651        return ret ? error("Fetch failed.") : 0;
 652}
 653
 654static int fetch_git(struct discovery *heads,
 655        int nr_heads, struct ref **to_fetch)
 656{
 657        struct rpc_state rpc;
 658        struct strbuf preamble = STRBUF_INIT;
 659        char *depth_arg = NULL;
 660        int argc = 0, i, err;
 661        const char *argv[15];
 662
 663        argv[argc++] = "fetch-pack";
 664        argv[argc++] = "--stateless-rpc";
 665        argv[argc++] = "--stdin";
 666        argv[argc++] = "--lock-pack";
 667        if (options.followtags)
 668                argv[argc++] = "--include-tag";
 669        if (options.thin)
 670                argv[argc++] = "--thin";
 671        if (options.verbosity >= 3) {
 672                argv[argc++] = "-v";
 673                argv[argc++] = "-v";
 674        }
 675        if (!options.progress)
 676                argv[argc++] = "--no-progress";
 677        if (options.depth) {
 678                struct strbuf buf = STRBUF_INIT;
 679                strbuf_addf(&buf, "--depth=%lu", options.depth);
 680                depth_arg = strbuf_detach(&buf, NULL);
 681                argv[argc++] = depth_arg;
 682        }
 683        argv[argc++] = url;
 684        argv[argc++] = NULL;
 685
 686        for (i = 0; i < nr_heads; i++) {
 687                struct ref *ref = to_fetch[i];
 688                if (!ref->name || !*ref->name)
 689                        die("cannot fetch by sha1 over smart http");
 690                packet_buf_write(&preamble, "%s\n", ref->name);
 691        }
 692        packet_buf_flush(&preamble);
 693
 694        memset(&rpc, 0, sizeof(rpc));
 695        rpc.service_name = "git-upload-pack",
 696        rpc.argv = argv;
 697        rpc.stdin_preamble = &preamble;
 698        rpc.gzip_request = 1;
 699
 700        err = rpc_service(&rpc, heads);
 701        if (rpc.result.len)
 702                write_or_die(1, rpc.result.buf, rpc.result.len);
 703        strbuf_release(&rpc.result);
 704        strbuf_release(&preamble);
 705        free(depth_arg);
 706        return err;
 707}
 708
 709static int fetch(int nr_heads, struct ref **to_fetch)
 710{
 711        struct discovery *d = discover_refs("git-upload-pack", 0);
 712        if (d->proto_git)
 713                return fetch_git(d, nr_heads, to_fetch);
 714        else
 715                return fetch_dumb(nr_heads, to_fetch);
 716}
 717
 718static void parse_fetch(struct strbuf *buf)
 719{
 720        struct ref **to_fetch = NULL;
 721        struct ref *list_head = NULL;
 722        struct ref **list = &list_head;
 723        int alloc_heads = 0, nr_heads = 0;
 724
 725        do {
 726                if (!prefixcmp(buf->buf, "fetch ")) {
 727                        char *p = buf->buf + strlen("fetch ");
 728                        char *name;
 729                        struct ref *ref;
 730                        unsigned char old_sha1[20];
 731
 732                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 733                                die("protocol error: expected sha/ref, got %s'", p);
 734                        if (p[40] == ' ')
 735                                name = p + 41;
 736                        else if (!p[40])
 737                                name = "";
 738                        else
 739                                die("protocol error: expected sha/ref, got %s'", p);
 740
 741                        ref = alloc_ref(name);
 742                        hashcpy(ref->old_sha1, old_sha1);
 743
 744                        *list = ref;
 745                        list = &ref->next;
 746
 747                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 748                        to_fetch[nr_heads++] = ref;
 749                }
 750                else
 751                        die("http transport does not support %s", buf->buf);
 752
 753                strbuf_reset(buf);
 754                if (strbuf_getline(buf, stdin, '\n') == EOF)
 755                        return;
 756                if (!*buf->buf)
 757                        break;
 758        } while (1);
 759
 760        if (fetch(nr_heads, to_fetch))
 761                exit(128); /* error already reported */
 762        free_refs(list_head);
 763        free(to_fetch);
 764
 765        printf("\n");
 766        fflush(stdout);
 767        strbuf_reset(buf);
 768}
 769
 770static int push_dav(int nr_spec, char **specs)
 771{
 772        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 773        int argc = 0, i;
 774
 775        argv[argc++] = "http-push";
 776        argv[argc++] = "--helper-status";
 777        if (options.dry_run)
 778                argv[argc++] = "--dry-run";
 779        if (options.verbosity > 1)
 780                argv[argc++] = "--verbose";
 781        argv[argc++] = url;
 782        for (i = 0; i < nr_spec; i++)
 783                argv[argc++] = specs[i];
 784        argv[argc++] = NULL;
 785
 786        if (run_command_v_opt(argv, RUN_GIT_CMD))
 787                die("git-%s failed", argv[0]);
 788        free(argv);
 789        return 0;
 790}
 791
 792static int push_git(struct discovery *heads, int nr_spec, char **specs)
 793{
 794        struct rpc_state rpc;
 795        int i, err;
 796        struct argv_array args;
 797
 798        argv_array_init(&args);
 799        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 800                         NULL);
 801
 802        if (options.thin)
 803                argv_array_push(&args, "--thin");
 804        if (options.dry_run)
 805                argv_array_push(&args, "--dry-run");
 806        if (options.verbosity == 0)
 807                argv_array_push(&args, "--quiet");
 808        else if (options.verbosity > 1)
 809                argv_array_push(&args, "--verbose");
 810        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 811        argv_array_push(&args, url);
 812        for (i = 0; i < nr_spec; i++)
 813                argv_array_push(&args, specs[i]);
 814
 815        memset(&rpc, 0, sizeof(rpc));
 816        rpc.service_name = "git-receive-pack",
 817        rpc.argv = args.argv;
 818
 819        err = rpc_service(&rpc, heads);
 820        if (rpc.result.len)
 821                write_or_die(1, rpc.result.buf, rpc.result.len);
 822        strbuf_release(&rpc.result);
 823        argv_array_clear(&args);
 824        return err;
 825}
 826
 827static int push(int nr_spec, char **specs)
 828{
 829        struct discovery *heads = discover_refs("git-receive-pack", 1);
 830        int ret;
 831
 832        if (heads->proto_git)
 833                ret = push_git(heads, nr_spec, specs);
 834        else
 835                ret = push_dav(nr_spec, specs);
 836        free_discovery(heads);
 837        return ret;
 838}
 839
 840static void parse_push(struct strbuf *buf)
 841{
 842        char **specs = NULL;
 843        int alloc_spec = 0, nr_spec = 0, i, ret;
 844
 845        do {
 846                if (!prefixcmp(buf->buf, "push ")) {
 847                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 848                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 849                }
 850                else
 851                        die("http transport does not support %s", buf->buf);
 852
 853                strbuf_reset(buf);
 854                if (strbuf_getline(buf, stdin, '\n') == EOF)
 855                        goto free_specs;
 856                if (!*buf->buf)
 857                        break;
 858        } while (1);
 859
 860        ret = push(nr_spec, specs);
 861        printf("\n");
 862        fflush(stdout);
 863
 864        if (ret)
 865                exit(128); /* error already reported */
 866
 867 free_specs:
 868        for (i = 0; i < nr_spec; i++)
 869                free(specs[i]);
 870        free(specs);
 871}
 872
 873int main(int argc, const char **argv)
 874{
 875        struct strbuf buf = STRBUF_INIT;
 876        int nongit;
 877
 878        git_extract_argv0_path(argv[0]);
 879        setup_git_directory_gently(&nongit);
 880        if (argc < 2) {
 881                fprintf(stderr, "Remote needed\n");
 882                return 1;
 883        }
 884
 885        options.verbosity = 1;
 886        options.progress = !!isatty(2);
 887        options.thin = 1;
 888
 889        remote = remote_get(argv[1]);
 890
 891        if (argc > 2) {
 892                end_url_with_slash(&buf, argv[2]);
 893        } else {
 894                end_url_with_slash(&buf, remote->url[0]);
 895        }
 896
 897        url = strbuf_detach(&buf, NULL);
 898
 899        http_init(remote, url, 0);
 900
 901        do {
 902                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 903                        if (ferror(stdin))
 904                                fprintf(stderr, "Error reading command stream\n");
 905                        else
 906                                fprintf(stderr, "Unexpected end of command stream\n");
 907                        return 1;
 908                }
 909                if (buf.len == 0)
 910                        break;
 911                if (!prefixcmp(buf.buf, "fetch ")) {
 912                        if (nongit)
 913                                die("Fetch attempted without a local repo");
 914                        parse_fetch(&buf);
 915
 916                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 917                        int for_push = !!strstr(buf.buf + 4, "for-push");
 918                        output_refs(get_refs(for_push));
 919
 920                } else if (!prefixcmp(buf.buf, "push ")) {
 921                        parse_push(&buf);
 922
 923                } else if (!prefixcmp(buf.buf, "option ")) {
 924                        char *name = buf.buf + strlen("option ");
 925                        char *value = strchr(name, ' ');
 926                        int result;
 927
 928                        if (value)
 929                                *value++ = '\0';
 930                        else
 931                                value = "true";
 932
 933                        result = set_option(name, value);
 934                        if (!result)
 935                                printf("ok\n");
 936                        else if (result < 0)
 937                                printf("error invalid value\n");
 938                        else
 939                                printf("unsupported\n");
 940                        fflush(stdout);
 941
 942                } else if (!strcmp(buf.buf, "capabilities")) {
 943                        printf("fetch\n");
 944                        printf("option\n");
 945                        printf("push\n");
 946                        printf("\n");
 947                        fflush(stdout);
 948                } else {
 949                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 950                        return 1;
 951                }
 952                strbuf_reset(&buf);
 953        } while (1);
 954
 955        http_cleanup();
 956
 957        return 0;
 958}