Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit pkt-line: share buffer/descriptor reading implementation (4981fe7)
   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 exp = STRBUF_INIT;
  96        struct strbuf type = STRBUF_INIT;
  97        struct strbuf buffer = STRBUF_INIT;
  98        struct discovery *last = last_discovery;
  99        char *refs_url;
 100        int http_ret, maybe_smart = 0;
 101
 102        if (last && !strcmp(service, last->service))
 103                return last;
 104        free_discovery(last);
 105
 106        strbuf_addf(&buffer, "%sinfo/refs", url);
 107        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 108             git_env_bool("GIT_SMART_HTTP", 1)) {
 109                maybe_smart = 1;
 110                if (!strchr(url, '?'))
 111                        strbuf_addch(&buffer, '?');
 112                else
 113                        strbuf_addch(&buffer, '&');
 114                strbuf_addf(&buffer, "service=%s", service);
 115        }
 116        refs_url = strbuf_detach(&buffer, NULL);
 117
 118        http_ret = http_get_strbuf(refs_url, &type, &buffer, HTTP_NO_CACHE);
 119        switch (http_ret) {
 120        case HTTP_OK:
 121                break;
 122        case HTTP_MISSING_TARGET:
 123                die("%s not found: did you run git update-server-info on the"
 124                    " server?", refs_url);
 125        case HTTP_NOAUTH:
 126                die("Authentication failed");
 127        default:
 128                http_error(refs_url, http_ret);
 129                die("HTTP request failed");
 130        }
 131
 132        last= xcalloc(1, sizeof(*last_discovery));
 133        last->service = service;
 134        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 135        last->buf = last->buf_alloc;
 136
 137        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 138        if (maybe_smart &&
 139            (5 <= last->len && last->buf[4] == '#') &&
 140            !strbuf_cmp(&exp, &type)) {
 141                char *line;
 142
 143                /*
 144                 * smart HTTP response; validate that the service
 145                 * pkt-line matches our request.
 146                 */
 147                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 148
 149                strbuf_reset(&exp);
 150                strbuf_addf(&exp, "# service=%s", service);
 151                if (strcmp(line, exp.buf))
 152                        die("invalid server response; got '%s'", line);
 153                strbuf_release(&exp);
 154
 155                /* The header can include additional metadata lines, up
 156                 * until a packet flush marker.  Ignore these now, but
 157                 * in the future we might start to scan them.
 158                 */
 159                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 160                        ;
 161
 162                last->proto_git = 1;
 163        }
 164
 165        free(refs_url);
 166        strbuf_release(&exp);
 167        strbuf_release(&type);
 168        strbuf_release(&buffer);
 169        last_discovery = last;
 170        return last;
 171}
 172
 173static int write_discovery(int in, int out, void *data)
 174{
 175        struct discovery *heads = data;
 176        int err = 0;
 177        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 178                err = 1;
 179        close(out);
 180        return err;
 181}
 182
 183static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 184{
 185        struct ref *list = NULL;
 186        struct async async;
 187
 188        memset(&async, 0, sizeof(async));
 189        async.proc = write_discovery;
 190        async.data = heads;
 191        async.out = -1;
 192
 193        if (start_async(&async))
 194                die("cannot start thread to parse advertised refs");
 195        get_remote_heads(async.out, &list,
 196                        for_push ? REF_NORMAL : 0, NULL);
 197        close(async.out);
 198        if (finish_async(&async))
 199                die("ref parsing thread failed");
 200        return list;
 201}
 202
 203static struct ref *parse_info_refs(struct discovery *heads)
 204{
 205        char *data, *start, *mid;
 206        char *ref_name;
 207        int i = 0;
 208
 209        struct ref *refs = NULL;
 210        struct ref *ref = NULL;
 211        struct ref *last_ref = NULL;
 212
 213        data = heads->buf;
 214        start = NULL;
 215        mid = data;
 216        while (i < heads->len) {
 217                if (!start) {
 218                        start = &data[i];
 219                }
 220                if (data[i] == '\t')
 221                        mid = &data[i];
 222                if (data[i] == '\n') {
 223                        if (mid - start != 40)
 224                                die("%sinfo/refs not valid: is this a git repository?", url);
 225                        data[i] = 0;
 226                        ref_name = mid + 1;
 227                        ref = xmalloc(sizeof(struct ref) +
 228                                      strlen(ref_name) + 1);
 229                        memset(ref, 0, sizeof(struct ref));
 230                        strcpy(ref->name, ref_name);
 231                        get_sha1_hex(start, ref->old_sha1);
 232                        if (!refs)
 233                                refs = ref;
 234                        if (last_ref)
 235                                last_ref->next = ref;
 236                        last_ref = ref;
 237                        start = NULL;
 238                }
 239                i++;
 240        }
 241
 242        ref = alloc_ref("HEAD");
 243        if (!http_fetch_ref(url, ref) &&
 244            !resolve_remote_symref(ref, refs)) {
 245                ref->next = refs;
 246                refs = ref;
 247        } else {
 248                free(ref);
 249        }
 250
 251        return refs;
 252}
 253
 254static struct ref *get_refs(int for_push)
 255{
 256        struct discovery *heads;
 257
 258        if (for_push)
 259                heads = discover_refs("git-receive-pack");
 260        else
 261                heads = discover_refs("git-upload-pack");
 262
 263        if (heads->proto_git)
 264                return parse_git_refs(heads, for_push);
 265        return parse_info_refs(heads);
 266}
 267
 268static void output_refs(struct ref *refs)
 269{
 270        struct ref *posn;
 271        for (posn = refs; posn; posn = posn->next) {
 272                if (posn->symref)
 273                        printf("@%s %s\n", posn->symref, posn->name);
 274                else
 275                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 276        }
 277        printf("\n");
 278        fflush(stdout);
 279        free_refs(refs);
 280}
 281
 282struct rpc_state {
 283        const char *service_name;
 284        const char **argv;
 285        struct strbuf *stdin_preamble;
 286        char *service_url;
 287        char *hdr_content_type;
 288        char *hdr_accept;
 289        char *buf;
 290        size_t alloc;
 291        size_t len;
 292        size_t pos;
 293        int in;
 294        int out;
 295        struct strbuf result;
 296        unsigned gzip_request : 1;
 297        unsigned initial_buffer : 1;
 298};
 299
 300static size_t rpc_out(void *ptr, size_t eltsize,
 301                size_t nmemb, void *buffer_)
 302{
 303        size_t max = eltsize * nmemb;
 304        struct rpc_state *rpc = buffer_;
 305        size_t avail = rpc->len - rpc->pos;
 306
 307        if (!avail) {
 308                rpc->initial_buffer = 0;
 309                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 310                if (!avail)
 311                        return 0;
 312                rpc->pos = 0;
 313                rpc->len = avail;
 314        }
 315
 316        if (max < avail)
 317                avail = max;
 318        memcpy(ptr, rpc->buf + rpc->pos, avail);
 319        rpc->pos += avail;
 320        return avail;
 321}
 322
 323#ifndef NO_CURL_IOCTL
 324static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 325{
 326        struct rpc_state *rpc = clientp;
 327
 328        switch (cmd) {
 329        case CURLIOCMD_NOP:
 330                return CURLIOE_OK;
 331
 332        case CURLIOCMD_RESTARTREAD:
 333                if (rpc->initial_buffer) {
 334                        rpc->pos = 0;
 335                        return CURLIOE_OK;
 336                }
 337                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 338                return CURLIOE_FAILRESTART;
 339
 340        default:
 341                return CURLIOE_UNKNOWNCMD;
 342        }
 343}
 344#endif
 345
 346static size_t rpc_in(char *ptr, size_t eltsize,
 347                size_t nmemb, void *buffer_)
 348{
 349        size_t size = eltsize * nmemb;
 350        struct rpc_state *rpc = buffer_;
 351        write_or_die(rpc->in, ptr, size);
 352        return size;
 353}
 354
 355static int run_slot(struct active_request_slot *slot)
 356{
 357        int err;
 358        struct slot_results results;
 359
 360        slot->results = &results;
 361        slot->curl_result = curl_easy_perform(slot->curl);
 362        finish_active_slot(slot);
 363
 364        err = handle_curl_result(&results);
 365        if (err != HTTP_OK && err != HTTP_REAUTH) {
 366                error("RPC failed; result=%d, HTTP code = %ld",
 367                      results.curl_result, results.http_code);
 368        }
 369
 370        return err;
 371}
 372
 373static int probe_rpc(struct rpc_state *rpc)
 374{
 375        struct active_request_slot *slot;
 376        struct curl_slist *headers = NULL;
 377        struct strbuf buf = STRBUF_INIT;
 378        int err;
 379
 380        slot = get_active_slot();
 381
 382        headers = curl_slist_append(headers, rpc->hdr_content_type);
 383        headers = curl_slist_append(headers, rpc->hdr_accept);
 384
 385        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 386        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 387        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 388        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 389        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 390        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 391        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 392        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 393        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 394
 395        err = run_slot(slot);
 396
 397        curl_slist_free_all(headers);
 398        strbuf_release(&buf);
 399        return err;
 400}
 401
 402static int post_rpc(struct rpc_state *rpc)
 403{
 404        struct active_request_slot *slot;
 405        struct curl_slist *headers = NULL;
 406        int use_gzip = rpc->gzip_request;
 407        char *gzip_body = NULL;
 408        size_t gzip_size = 0;
 409        int err, large_request = 0;
 410
 411        /* Try to load the entire request, if we can fit it into the
 412         * allocated buffer space we can use HTTP/1.0 and avoid the
 413         * chunked encoding mess.
 414         */
 415        while (1) {
 416                size_t left = rpc->alloc - rpc->len;
 417                char *buf = rpc->buf + rpc->len;
 418                int n;
 419
 420                if (left < LARGE_PACKET_MAX) {
 421                        large_request = 1;
 422                        use_gzip = 0;
 423                        break;
 424                }
 425
 426                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 427                if (!n)
 428                        break;
 429                rpc->len += n;
 430        }
 431
 432        if (large_request) {
 433                do {
 434                        err = probe_rpc(rpc);
 435                } while (err == HTTP_REAUTH);
 436                if (err != HTTP_OK)
 437                        return -1;
 438        }
 439
 440        headers = curl_slist_append(headers, rpc->hdr_content_type);
 441        headers = curl_slist_append(headers, rpc->hdr_accept);
 442        headers = curl_slist_append(headers, "Expect:");
 443
 444retry:
 445        slot = get_active_slot();
 446
 447        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 448        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 449        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 450        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 451
 452        if (large_request) {
 453                /* The request body is large and the size cannot be predicted.
 454                 * We must use chunked encoding to send it.
 455                 */
 456                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 457                rpc->initial_buffer = 1;
 458                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 459                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 460#ifndef NO_CURL_IOCTL
 461                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 462                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 463#endif
 464                if (options.verbosity > 1) {
 465                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 466                        fflush(stderr);
 467                }
 468
 469        } else if (gzip_body) {
 470                /*
 471                 * If we are looping to retry authentication, then the previous
 472                 * run will have set up the headers and gzip buffer already,
 473                 * and we just need to send it.
 474                 */
 475                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 476                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 477
 478        } else if (use_gzip && 1024 < rpc->len) {
 479                /* The client backend isn't giving us compressed data so
 480                 * we can try to deflate it ourselves, this may save on.
 481                 * the transfer time.
 482                 */
 483                git_zstream stream;
 484                int ret;
 485
 486                memset(&stream, 0, sizeof(stream));
 487                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 488                gzip_size = git_deflate_bound(&stream, rpc->len);
 489                gzip_body = xmalloc(gzip_size);
 490
 491                stream.next_in = (unsigned char *)rpc->buf;
 492                stream.avail_in = rpc->len;
 493                stream.next_out = (unsigned char *)gzip_body;
 494                stream.avail_out = gzip_size;
 495
 496                ret = git_deflate(&stream, Z_FINISH);
 497                if (ret != Z_STREAM_END)
 498                        die("cannot deflate request; zlib deflate error %d", ret);
 499
 500                ret = git_deflate_end_gently(&stream);
 501                if (ret != Z_OK)
 502                        die("cannot deflate request; zlib end error %d", ret);
 503
 504                gzip_size = stream.total_out;
 505
 506                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 507                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 508                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 509
 510                if (options.verbosity > 1) {
 511                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 512                                rpc->service_name,
 513                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 514                        fflush(stderr);
 515                }
 516        } else {
 517                /* We know the complete request size in advance, use the
 518                 * more normal Content-Length approach.
 519                 */
 520                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 521                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 522                if (options.verbosity > 1) {
 523                        fprintf(stderr, "POST %s (%lu bytes)\n",
 524                                rpc->service_name, (unsigned long)rpc->len);
 525                        fflush(stderr);
 526                }
 527        }
 528
 529        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 530        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 531        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 532
 533        err = run_slot(slot);
 534        if (err == HTTP_REAUTH && !large_request)
 535                goto retry;
 536        if (err != HTTP_OK)
 537                err = -1;
 538
 539        curl_slist_free_all(headers);
 540        free(gzip_body);
 541        return err;
 542}
 543
 544static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 545{
 546        const char *svc = rpc->service_name;
 547        struct strbuf buf = STRBUF_INIT;
 548        struct strbuf *preamble = rpc->stdin_preamble;
 549        struct child_process client;
 550        int err = 0;
 551
 552        memset(&client, 0, sizeof(client));
 553        client.in = -1;
 554        client.out = -1;
 555        client.git_cmd = 1;
 556        client.argv = rpc->argv;
 557        if (start_command(&client))
 558                exit(1);
 559        if (preamble)
 560                write_or_die(client.in, preamble->buf, preamble->len);
 561        if (heads)
 562                write_or_die(client.in, heads->buf, heads->len);
 563
 564        rpc->alloc = http_post_buffer;
 565        rpc->buf = xmalloc(rpc->alloc);
 566        rpc->in = client.in;
 567        rpc->out = client.out;
 568        strbuf_init(&rpc->result, 0);
 569
 570        strbuf_addf(&buf, "%s%s", url, svc);
 571        rpc->service_url = strbuf_detach(&buf, NULL);
 572
 573        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 574        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 575
 576        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 577        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 578
 579        while (!err) {
 580                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 581                if (!n)
 582                        break;
 583                rpc->pos = 0;
 584                rpc->len = n;
 585                err |= post_rpc(rpc);
 586        }
 587
 588        close(client.in);
 589        client.in = -1;
 590        if (!err) {
 591                strbuf_read(&rpc->result, client.out, 0);
 592        } else {
 593                char buf[4096];
 594                for (;;)
 595                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 596                                break;
 597        }
 598
 599        close(client.out);
 600        client.out = -1;
 601
 602        err |= finish_command(&client);
 603        free(rpc->service_url);
 604        free(rpc->hdr_content_type);
 605        free(rpc->hdr_accept);
 606        free(rpc->buf);
 607        strbuf_release(&buf);
 608        return err;
 609}
 610
 611static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 612{
 613        struct walker *walker;
 614        char **targets = xmalloc(nr_heads * sizeof(char*));
 615        int ret, i;
 616
 617        if (options.depth)
 618                die("dumb http transport does not support --depth");
 619        for (i = 0; i < nr_heads; i++)
 620                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 621
 622        walker = get_http_walker(url);
 623        walker->get_all = 1;
 624        walker->get_tree = 1;
 625        walker->get_history = 1;
 626        walker->get_verbosely = options.verbosity >= 3;
 627        walker->get_recover = 0;
 628        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 629        walker_free(walker);
 630
 631        for (i = 0; i < nr_heads; i++)
 632                free(targets[i]);
 633        free(targets);
 634
 635        return ret ? error("Fetch failed.") : 0;
 636}
 637
 638static int fetch_git(struct discovery *heads,
 639        int nr_heads, struct ref **to_fetch)
 640{
 641        struct rpc_state rpc;
 642        struct strbuf preamble = STRBUF_INIT;
 643        char *depth_arg = NULL;
 644        int argc = 0, i, err;
 645        const char *argv[15];
 646
 647        argv[argc++] = "fetch-pack";
 648        argv[argc++] = "--stateless-rpc";
 649        argv[argc++] = "--stdin";
 650        argv[argc++] = "--lock-pack";
 651        if (options.followtags)
 652                argv[argc++] = "--include-tag";
 653        if (options.thin)
 654                argv[argc++] = "--thin";
 655        if (options.verbosity >= 3) {
 656                argv[argc++] = "-v";
 657                argv[argc++] = "-v";
 658        }
 659        if (!options.progress)
 660                argv[argc++] = "--no-progress";
 661        if (options.depth) {
 662                struct strbuf buf = STRBUF_INIT;
 663                strbuf_addf(&buf, "--depth=%lu", options.depth);
 664                depth_arg = strbuf_detach(&buf, NULL);
 665                argv[argc++] = depth_arg;
 666        }
 667        argv[argc++] = url;
 668        argv[argc++] = NULL;
 669
 670        for (i = 0; i < nr_heads; i++) {
 671                struct ref *ref = to_fetch[i];
 672                if (!ref->name || !*ref->name)
 673                        die("cannot fetch by sha1 over smart http");
 674                packet_buf_write(&preamble, "%s\n", ref->name);
 675        }
 676        packet_buf_flush(&preamble);
 677
 678        memset(&rpc, 0, sizeof(rpc));
 679        rpc.service_name = "git-upload-pack",
 680        rpc.argv = argv;
 681        rpc.stdin_preamble = &preamble;
 682        rpc.gzip_request = 1;
 683
 684        err = rpc_service(&rpc, heads);
 685        if (rpc.result.len)
 686                write_or_die(1, rpc.result.buf, rpc.result.len);
 687        strbuf_release(&rpc.result);
 688        strbuf_release(&preamble);
 689        free(depth_arg);
 690        return err;
 691}
 692
 693static int fetch(int nr_heads, struct ref **to_fetch)
 694{
 695        struct discovery *d = discover_refs("git-upload-pack");
 696        if (d->proto_git)
 697                return fetch_git(d, nr_heads, to_fetch);
 698        else
 699                return fetch_dumb(nr_heads, to_fetch);
 700}
 701
 702static void parse_fetch(struct strbuf *buf)
 703{
 704        struct ref **to_fetch = NULL;
 705        struct ref *list_head = NULL;
 706        struct ref **list = &list_head;
 707        int alloc_heads = 0, nr_heads = 0;
 708
 709        do {
 710                if (!prefixcmp(buf->buf, "fetch ")) {
 711                        char *p = buf->buf + strlen("fetch ");
 712                        char *name;
 713                        struct ref *ref;
 714                        unsigned char old_sha1[20];
 715
 716                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 717                                die("protocol error: expected sha/ref, got %s'", p);
 718                        if (p[40] == ' ')
 719                                name = p + 41;
 720                        else if (!p[40])
 721                                name = "";
 722                        else
 723                                die("protocol error: expected sha/ref, got %s'", p);
 724
 725                        ref = alloc_ref(name);
 726                        hashcpy(ref->old_sha1, old_sha1);
 727
 728                        *list = ref;
 729                        list = &ref->next;
 730
 731                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 732                        to_fetch[nr_heads++] = ref;
 733                }
 734                else
 735                        die("http transport does not support %s", buf->buf);
 736
 737                strbuf_reset(buf);
 738                if (strbuf_getline(buf, stdin, '\n') == EOF)
 739                        return;
 740                if (!*buf->buf)
 741                        break;
 742        } while (1);
 743
 744        if (fetch(nr_heads, to_fetch))
 745                exit(128); /* error already reported */
 746        free_refs(list_head);
 747        free(to_fetch);
 748
 749        printf("\n");
 750        fflush(stdout);
 751        strbuf_reset(buf);
 752}
 753
 754static int push_dav(int nr_spec, char **specs)
 755{
 756        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 757        int argc = 0, i;
 758
 759        argv[argc++] = "http-push";
 760        argv[argc++] = "--helper-status";
 761        if (options.dry_run)
 762                argv[argc++] = "--dry-run";
 763        if (options.verbosity > 1)
 764                argv[argc++] = "--verbose";
 765        argv[argc++] = url;
 766        for (i = 0; i < nr_spec; i++)
 767                argv[argc++] = specs[i];
 768        argv[argc++] = NULL;
 769
 770        if (run_command_v_opt(argv, RUN_GIT_CMD))
 771                die("git-%s failed", argv[0]);
 772        free(argv);
 773        return 0;
 774}
 775
 776static int push_git(struct discovery *heads, int nr_spec, char **specs)
 777{
 778        struct rpc_state rpc;
 779        const char **argv;
 780        int argc = 0, i, err;
 781
 782        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 783        argv[argc++] = "send-pack";
 784        argv[argc++] = "--stateless-rpc";
 785        argv[argc++] = "--helper-status";
 786        if (options.thin)
 787                argv[argc++] = "--thin";
 788        if (options.dry_run)
 789                argv[argc++] = "--dry-run";
 790        if (options.verbosity == 0)
 791                argv[argc++] = "--quiet";
 792        else if (options.verbosity > 1)
 793                argv[argc++] = "--verbose";
 794        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 795        argv[argc++] = url;
 796        for (i = 0; i < nr_spec; i++)
 797                argv[argc++] = specs[i];
 798        argv[argc++] = NULL;
 799
 800        memset(&rpc, 0, sizeof(rpc));
 801        rpc.service_name = "git-receive-pack",
 802        rpc.argv = argv;
 803
 804        err = rpc_service(&rpc, heads);
 805        if (rpc.result.len)
 806                write_or_die(1, rpc.result.buf, rpc.result.len);
 807        strbuf_release(&rpc.result);
 808        free(argv);
 809        return err;
 810}
 811
 812static int push(int nr_spec, char **specs)
 813{
 814        struct discovery *heads = discover_refs("git-receive-pack");
 815        int ret;
 816
 817        if (heads->proto_git)
 818                ret = push_git(heads, nr_spec, specs);
 819        else
 820                ret = push_dav(nr_spec, specs);
 821        free_discovery(heads);
 822        return ret;
 823}
 824
 825static void parse_push(struct strbuf *buf)
 826{
 827        char **specs = NULL;
 828        int alloc_spec = 0, nr_spec = 0, i, ret;
 829
 830        do {
 831                if (!prefixcmp(buf->buf, "push ")) {
 832                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 833                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 834                }
 835                else
 836                        die("http transport does not support %s", buf->buf);
 837
 838                strbuf_reset(buf);
 839                if (strbuf_getline(buf, stdin, '\n') == EOF)
 840                        goto free_specs;
 841                if (!*buf->buf)
 842                        break;
 843        } while (1);
 844
 845        ret = push(nr_spec, specs);
 846        printf("\n");
 847        fflush(stdout);
 848
 849        if (ret)
 850                exit(128); /* error already reported */
 851
 852 free_specs:
 853        for (i = 0; i < nr_spec; i++)
 854                free(specs[i]);
 855        free(specs);
 856}
 857
 858int main(int argc, const char **argv)
 859{
 860        struct strbuf buf = STRBUF_INIT;
 861        int nongit;
 862
 863        git_extract_argv0_path(argv[0]);
 864        setup_git_directory_gently(&nongit);
 865        if (argc < 2) {
 866                fprintf(stderr, "Remote needed\n");
 867                return 1;
 868        }
 869
 870        options.verbosity = 1;
 871        options.progress = !!isatty(2);
 872        options.thin = 1;
 873
 874        remote = remote_get(argv[1]);
 875
 876        if (argc > 2) {
 877                end_url_with_slash(&buf, argv[2]);
 878        } else {
 879                end_url_with_slash(&buf, remote->url[0]);
 880        }
 881
 882        url = strbuf_detach(&buf, NULL);
 883
 884        http_init(remote, url, 0);
 885
 886        do {
 887                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 888                        if (ferror(stdin))
 889                                fprintf(stderr, "Error reading command stream\n");
 890                        else
 891                                fprintf(stderr, "Unexpected end of command stream\n");
 892                        return 1;
 893                }
 894                if (buf.len == 0)
 895                        break;
 896                if (!prefixcmp(buf.buf, "fetch ")) {
 897                        if (nongit)
 898                                die("Fetch attempted without a local repo");
 899                        parse_fetch(&buf);
 900
 901                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 902                        int for_push = !!strstr(buf.buf + 4, "for-push");
 903                        output_refs(get_refs(for_push));
 904
 905                } else if (!prefixcmp(buf.buf, "push ")) {
 906                        parse_push(&buf);
 907
 908                } else if (!prefixcmp(buf.buf, "option ")) {
 909                        char *name = buf.buf + strlen("option ");
 910                        char *value = strchr(name, ' ');
 911                        int result;
 912
 913                        if (value)
 914                                *value++ = '\0';
 915                        else
 916                                value = "true";
 917
 918                        result = set_option(name, value);
 919                        if (!result)
 920                                printf("ok\n");
 921                        else if (result < 0)
 922                                printf("error invalid value\n");
 923                        else
 924                                printf("unsupported\n");
 925                        fflush(stdout);
 926
 927                } else if (!strcmp(buf.buf, "capabilities")) {
 928                        printf("fetch\n");
 929                        printf("option\n");
 930                        printf("push\n");
 931                        printf("\n");
 932                        fflush(stdout);
 933                } else {
 934                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 935                        return 1;
 936                }
 937                strbuf_reset(&buf);
 938        } while (1);
 939
 940        http_cleanup();
 941
 942        return 0;
 943}