Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit glossary: improve description of SHA-1 related topics (3ab5012)
   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                /*
 142                 * smart HTTP response; validate that the service
 143                 * pkt-line matches our request.
 144                 */
 145                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 146                        die("%s has invalid packet header", refs_url);
 147                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 148                        strbuf_setlen(&buffer, buffer.len - 1);
 149
 150                strbuf_reset(&exp);
 151                strbuf_addf(&exp, "# service=%s", service);
 152                if (strbuf_cmp(&exp, &buffer))
 153                        die("invalid server response; got '%s'", buffer.buf);
 154                strbuf_release(&exp);
 155
 156                /* The header can include additional metadata lines, up
 157                 * until a packet flush marker.  Ignore these now, but
 158                 * in the future we might start to scan them.
 159                 */
 160                strbuf_reset(&buffer);
 161                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 162                        strbuf_reset(&buffer);
 163
 164                last->proto_git = 1;
 165        }
 166
 167        free(refs_url);
 168        strbuf_release(&exp);
 169        strbuf_release(&type);
 170        strbuf_release(&buffer);
 171        last_discovery = last;
 172        return last;
 173}
 174
 175static int write_discovery(int in, int out, void *data)
 176{
 177        struct discovery *heads = data;
 178        int err = 0;
 179        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 180                err = 1;
 181        close(out);
 182        return err;
 183}
 184
 185static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 186{
 187        struct ref *list = NULL;
 188        struct async async;
 189
 190        memset(&async, 0, sizeof(async));
 191        async.proc = write_discovery;
 192        async.data = heads;
 193        async.out = -1;
 194
 195        if (start_async(&async))
 196                die("cannot start thread to parse advertised refs");
 197        get_remote_heads(async.out, &list,
 198                        for_push ? REF_NORMAL : 0, NULL);
 199        close(async.out);
 200        if (finish_async(&async))
 201                die("ref parsing thread failed");
 202        return list;
 203}
 204
 205static struct ref *parse_info_refs(struct discovery *heads)
 206{
 207        char *data, *start, *mid;
 208        char *ref_name;
 209        int i = 0;
 210
 211        struct ref *refs = NULL;
 212        struct ref *ref = NULL;
 213        struct ref *last_ref = NULL;
 214
 215        data = heads->buf;
 216        start = NULL;
 217        mid = data;
 218        while (i < heads->len) {
 219                if (!start) {
 220                        start = &data[i];
 221                }
 222                if (data[i] == '\t')
 223                        mid = &data[i];
 224                if (data[i] == '\n') {
 225                        if (mid - start != 40)
 226                                die("%sinfo/refs not valid: is this a git repository?", url);
 227                        data[i] = 0;
 228                        ref_name = mid + 1;
 229                        ref = xmalloc(sizeof(struct ref) +
 230                                      strlen(ref_name) + 1);
 231                        memset(ref, 0, sizeof(struct ref));
 232                        strcpy(ref->name, ref_name);
 233                        get_sha1_hex(start, ref->old_sha1);
 234                        if (!refs)
 235                                refs = ref;
 236                        if (last_ref)
 237                                last_ref->next = ref;
 238                        last_ref = ref;
 239                        start = NULL;
 240                }
 241                i++;
 242        }
 243
 244        ref = alloc_ref("HEAD");
 245        if (!http_fetch_ref(url, ref) &&
 246            !resolve_remote_symref(ref, refs)) {
 247                ref->next = refs;
 248                refs = ref;
 249        } else {
 250                free(ref);
 251        }
 252
 253        return refs;
 254}
 255
 256static struct ref *get_refs(int for_push)
 257{
 258        struct discovery *heads;
 259
 260        if (for_push)
 261                heads = discover_refs("git-receive-pack");
 262        else
 263                heads = discover_refs("git-upload-pack");
 264
 265        if (heads->proto_git)
 266                return parse_git_refs(heads, for_push);
 267        return parse_info_refs(heads);
 268}
 269
 270static void output_refs(struct ref *refs)
 271{
 272        struct ref *posn;
 273        for (posn = refs; posn; posn = posn->next) {
 274                if (posn->symref)
 275                        printf("@%s %s\n", posn->symref, posn->name);
 276                else
 277                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 278        }
 279        printf("\n");
 280        fflush(stdout);
 281        free_refs(refs);
 282}
 283
 284struct rpc_state {
 285        const char *service_name;
 286        const char **argv;
 287        struct strbuf *stdin_preamble;
 288        char *service_url;
 289        char *hdr_content_type;
 290        char *hdr_accept;
 291        char *buf;
 292        size_t alloc;
 293        size_t len;
 294        size_t pos;
 295        int in;
 296        int out;
 297        struct strbuf result;
 298        unsigned gzip_request : 1;
 299        unsigned initial_buffer : 1;
 300};
 301
 302static size_t rpc_out(void *ptr, size_t eltsize,
 303                size_t nmemb, void *buffer_)
 304{
 305        size_t max = eltsize * nmemb;
 306        struct rpc_state *rpc = buffer_;
 307        size_t avail = rpc->len - rpc->pos;
 308
 309        if (!avail) {
 310                rpc->initial_buffer = 0;
 311                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 312                if (!avail)
 313                        return 0;
 314                rpc->pos = 0;
 315                rpc->len = avail;
 316        }
 317
 318        if (max < avail)
 319                avail = max;
 320        memcpy(ptr, rpc->buf + rpc->pos, avail);
 321        rpc->pos += avail;
 322        return avail;
 323}
 324
 325#ifndef NO_CURL_IOCTL
 326static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 327{
 328        struct rpc_state *rpc = clientp;
 329
 330        switch (cmd) {
 331        case CURLIOCMD_NOP:
 332                return CURLIOE_OK;
 333
 334        case CURLIOCMD_RESTARTREAD:
 335                if (rpc->initial_buffer) {
 336                        rpc->pos = 0;
 337                        return CURLIOE_OK;
 338                }
 339                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 340                return CURLIOE_FAILRESTART;
 341
 342        default:
 343                return CURLIOE_UNKNOWNCMD;
 344        }
 345}
 346#endif
 347
 348static size_t rpc_in(char *ptr, size_t eltsize,
 349                size_t nmemb, void *buffer_)
 350{
 351        size_t size = eltsize * nmemb;
 352        struct rpc_state *rpc = buffer_;
 353        write_or_die(rpc->in, ptr, size);
 354        return size;
 355}
 356
 357static int run_slot(struct active_request_slot *slot)
 358{
 359        int err;
 360        struct slot_results results;
 361
 362        slot->results = &results;
 363        slot->curl_result = curl_easy_perform(slot->curl);
 364        finish_active_slot(slot);
 365
 366        err = handle_curl_result(&results);
 367        if (err != HTTP_OK && err != HTTP_REAUTH) {
 368                error("RPC failed; result=%d, HTTP code = %ld",
 369                      results.curl_result, results.http_code);
 370        }
 371
 372        return err;
 373}
 374
 375static int probe_rpc(struct rpc_state *rpc)
 376{
 377        struct active_request_slot *slot;
 378        struct curl_slist *headers = NULL;
 379        struct strbuf buf = STRBUF_INIT;
 380        int err;
 381
 382        slot = get_active_slot();
 383
 384        headers = curl_slist_append(headers, rpc->hdr_content_type);
 385        headers = curl_slist_append(headers, rpc->hdr_accept);
 386
 387        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 388        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 389        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 390        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 391        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 392        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 393        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 394        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 395        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 396
 397        err = run_slot(slot);
 398
 399        curl_slist_free_all(headers);
 400        strbuf_release(&buf);
 401        return err;
 402}
 403
 404static int post_rpc(struct rpc_state *rpc)
 405{
 406        struct active_request_slot *slot;
 407        struct curl_slist *headers = NULL;
 408        int use_gzip = rpc->gzip_request;
 409        char *gzip_body = NULL;
 410        size_t gzip_size = 0;
 411        int err, large_request = 0;
 412
 413        /* Try to load the entire request, if we can fit it into the
 414         * allocated buffer space we can use HTTP/1.0 and avoid the
 415         * chunked encoding mess.
 416         */
 417        while (1) {
 418                size_t left = rpc->alloc - rpc->len;
 419                char *buf = rpc->buf + rpc->len;
 420                int n;
 421
 422                if (left < LARGE_PACKET_MAX) {
 423                        large_request = 1;
 424                        use_gzip = 0;
 425                        break;
 426                }
 427
 428                n = packet_read_line(rpc->out, buf, left);
 429                if (!n)
 430                        break;
 431                rpc->len += n;
 432        }
 433
 434        if (large_request) {
 435                do {
 436                        err = probe_rpc(rpc);
 437                } while (err == HTTP_REAUTH);
 438                if (err != HTTP_OK)
 439                        return -1;
 440        }
 441
 442        headers = curl_slist_append(headers, rpc->hdr_content_type);
 443        headers = curl_slist_append(headers, rpc->hdr_accept);
 444        headers = curl_slist_append(headers, "Expect:");
 445
 446retry:
 447        slot = get_active_slot();
 448
 449        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 450        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 451        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 452        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 453
 454        if (large_request) {
 455                /* The request body is large and the size cannot be predicted.
 456                 * We must use chunked encoding to send it.
 457                 */
 458                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 459                rpc->initial_buffer = 1;
 460                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 461                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 462#ifndef NO_CURL_IOCTL
 463                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 464                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 465#endif
 466                if (options.verbosity > 1) {
 467                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 468                        fflush(stderr);
 469                }
 470
 471        } else if (gzip_body) {
 472                /*
 473                 * If we are looping to retry authentication, then the previous
 474                 * run will have set up the headers and gzip buffer already,
 475                 * and we just need to send it.
 476                 */
 477                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 478                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 479
 480        } else if (use_gzip && 1024 < rpc->len) {
 481                /* The client backend isn't giving us compressed data so
 482                 * we can try to deflate it ourselves, this may save on.
 483                 * the transfer time.
 484                 */
 485                git_zstream stream;
 486                int ret;
 487
 488                memset(&stream, 0, sizeof(stream));
 489                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 490                gzip_size = git_deflate_bound(&stream, rpc->len);
 491                gzip_body = xmalloc(gzip_size);
 492
 493                stream.next_in = (unsigned char *)rpc->buf;
 494                stream.avail_in = rpc->len;
 495                stream.next_out = (unsigned char *)gzip_body;
 496                stream.avail_out = gzip_size;
 497
 498                ret = git_deflate(&stream, Z_FINISH);
 499                if (ret != Z_STREAM_END)
 500                        die("cannot deflate request; zlib deflate error %d", ret);
 501
 502                ret = git_deflate_end_gently(&stream);
 503                if (ret != Z_OK)
 504                        die("cannot deflate request; zlib end error %d", ret);
 505
 506                gzip_size = stream.total_out;
 507
 508                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 509                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 510                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 511
 512                if (options.verbosity > 1) {
 513                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 514                                rpc->service_name,
 515                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 516                        fflush(stderr);
 517                }
 518        } else {
 519                /* We know the complete request size in advance, use the
 520                 * more normal Content-Length approach.
 521                 */
 522                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 523                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 524                if (options.verbosity > 1) {
 525                        fprintf(stderr, "POST %s (%lu bytes)\n",
 526                                rpc->service_name, (unsigned long)rpc->len);
 527                        fflush(stderr);
 528                }
 529        }
 530
 531        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 532        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 533        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 534
 535        err = run_slot(slot);
 536        if (err == HTTP_REAUTH && !large_request)
 537                goto retry;
 538        if (err != HTTP_OK)
 539                err = -1;
 540
 541        curl_slist_free_all(headers);
 542        free(gzip_body);
 543        return err;
 544}
 545
 546static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 547{
 548        const char *svc = rpc->service_name;
 549        struct strbuf buf = STRBUF_INIT;
 550        struct strbuf *preamble = rpc->stdin_preamble;
 551        struct child_process client;
 552        int err = 0;
 553
 554        memset(&client, 0, sizeof(client));
 555        client.in = -1;
 556        client.out = -1;
 557        client.git_cmd = 1;
 558        client.argv = rpc->argv;
 559        if (start_command(&client))
 560                exit(1);
 561        if (preamble)
 562                write_or_die(client.in, preamble->buf, preamble->len);
 563        if (heads)
 564                write_or_die(client.in, heads->buf, heads->len);
 565
 566        rpc->alloc = http_post_buffer;
 567        rpc->buf = xmalloc(rpc->alloc);
 568        rpc->in = client.in;
 569        rpc->out = client.out;
 570        strbuf_init(&rpc->result, 0);
 571
 572        strbuf_addf(&buf, "%s%s", url, svc);
 573        rpc->service_url = strbuf_detach(&buf, NULL);
 574
 575        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 576        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 577
 578        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 579        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 580
 581        while (!err) {
 582                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 583                if (!n)
 584                        break;
 585                rpc->pos = 0;
 586                rpc->len = n;
 587                err |= post_rpc(rpc);
 588        }
 589
 590        close(client.in);
 591        client.in = -1;
 592        if (!err) {
 593                strbuf_read(&rpc->result, client.out, 0);
 594        } else {
 595                char buf[4096];
 596                for (;;)
 597                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 598                                break;
 599        }
 600
 601        close(client.out);
 602        client.out = -1;
 603
 604        err |= finish_command(&client);
 605        free(rpc->service_url);
 606        free(rpc->hdr_content_type);
 607        free(rpc->hdr_accept);
 608        free(rpc->buf);
 609        strbuf_release(&buf);
 610        return err;
 611}
 612
 613static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 614{
 615        struct walker *walker;
 616        char **targets = xmalloc(nr_heads * sizeof(char*));
 617        int ret, i;
 618
 619        if (options.depth)
 620                die("dumb http transport does not support --depth");
 621        for (i = 0; i < nr_heads; i++)
 622                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 623
 624        walker = get_http_walker(url);
 625        walker->get_all = 1;
 626        walker->get_tree = 1;
 627        walker->get_history = 1;
 628        walker->get_verbosely = options.verbosity >= 3;
 629        walker->get_recover = 0;
 630        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 631        walker_free(walker);
 632
 633        for (i = 0; i < nr_heads; i++)
 634                free(targets[i]);
 635        free(targets);
 636
 637        return ret ? error("Fetch failed.") : 0;
 638}
 639
 640static int fetch_git(struct discovery *heads,
 641        int nr_heads, struct ref **to_fetch)
 642{
 643        struct rpc_state rpc;
 644        struct strbuf preamble = STRBUF_INIT;
 645        char *depth_arg = NULL;
 646        int argc = 0, i, err;
 647        const char *argv[15];
 648
 649        argv[argc++] = "fetch-pack";
 650        argv[argc++] = "--stateless-rpc";
 651        argv[argc++] = "--stdin";
 652        argv[argc++] = "--lock-pack";
 653        if (options.followtags)
 654                argv[argc++] = "--include-tag";
 655        if (options.thin)
 656                argv[argc++] = "--thin";
 657        if (options.verbosity >= 3) {
 658                argv[argc++] = "-v";
 659                argv[argc++] = "-v";
 660        }
 661        if (!options.progress)
 662                argv[argc++] = "--no-progress";
 663        if (options.depth) {
 664                struct strbuf buf = STRBUF_INIT;
 665                strbuf_addf(&buf, "--depth=%lu", options.depth);
 666                depth_arg = strbuf_detach(&buf, NULL);
 667                argv[argc++] = depth_arg;
 668        }
 669        argv[argc++] = url;
 670        argv[argc++] = NULL;
 671
 672        for (i = 0; i < nr_heads; i++) {
 673                struct ref *ref = to_fetch[i];
 674                if (!ref->name || !*ref->name)
 675                        die("cannot fetch by sha1 over smart http");
 676                packet_buf_write(&preamble, "%s\n", ref->name);
 677        }
 678        packet_buf_flush(&preamble);
 679
 680        memset(&rpc, 0, sizeof(rpc));
 681        rpc.service_name = "git-upload-pack",
 682        rpc.argv = argv;
 683        rpc.stdin_preamble = &preamble;
 684        rpc.gzip_request = 1;
 685
 686        err = rpc_service(&rpc, heads);
 687        if (rpc.result.len)
 688                safe_write(1, rpc.result.buf, rpc.result.len);
 689        strbuf_release(&rpc.result);
 690        strbuf_release(&preamble);
 691        free(depth_arg);
 692        return err;
 693}
 694
 695static int fetch(int nr_heads, struct ref **to_fetch)
 696{
 697        struct discovery *d = discover_refs("git-upload-pack");
 698        if (d->proto_git)
 699                return fetch_git(d, nr_heads, to_fetch);
 700        else
 701                return fetch_dumb(nr_heads, to_fetch);
 702}
 703
 704static void parse_fetch(struct strbuf *buf)
 705{
 706        struct ref **to_fetch = NULL;
 707        struct ref *list_head = NULL;
 708        struct ref **list = &list_head;
 709        int alloc_heads = 0, nr_heads = 0;
 710
 711        do {
 712                if (!prefixcmp(buf->buf, "fetch ")) {
 713                        char *p = buf->buf + strlen("fetch ");
 714                        char *name;
 715                        struct ref *ref;
 716                        unsigned char old_sha1[20];
 717
 718                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 719                                die("protocol error: expected sha/ref, got %s'", p);
 720                        if (p[40] == ' ')
 721                                name = p + 41;
 722                        else if (!p[40])
 723                                name = "";
 724                        else
 725                                die("protocol error: expected sha/ref, got %s'", p);
 726
 727                        ref = alloc_ref(name);
 728                        hashcpy(ref->old_sha1, old_sha1);
 729
 730                        *list = ref;
 731                        list = &ref->next;
 732
 733                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 734                        to_fetch[nr_heads++] = ref;
 735                }
 736                else
 737                        die("http transport does not support %s", buf->buf);
 738
 739                strbuf_reset(buf);
 740                if (strbuf_getline(buf, stdin, '\n') == EOF)
 741                        return;
 742                if (!*buf->buf)
 743                        break;
 744        } while (1);
 745
 746        if (fetch(nr_heads, to_fetch))
 747                exit(128); /* error already reported */
 748        free_refs(list_head);
 749        free(to_fetch);
 750
 751        printf("\n");
 752        fflush(stdout);
 753        strbuf_reset(buf);
 754}
 755
 756static int push_dav(int nr_spec, char **specs)
 757{
 758        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 759        int argc = 0, i;
 760
 761        argv[argc++] = "http-push";
 762        argv[argc++] = "--helper-status";
 763        if (options.dry_run)
 764                argv[argc++] = "--dry-run";
 765        if (options.verbosity > 1)
 766                argv[argc++] = "--verbose";
 767        argv[argc++] = url;
 768        for (i = 0; i < nr_spec; i++)
 769                argv[argc++] = specs[i];
 770        argv[argc++] = NULL;
 771
 772        if (run_command_v_opt(argv, RUN_GIT_CMD))
 773                die("git-%s failed", argv[0]);
 774        free(argv);
 775        return 0;
 776}
 777
 778static int push_git(struct discovery *heads, int nr_spec, char **specs)
 779{
 780        struct rpc_state rpc;
 781        const char **argv;
 782        int argc = 0, i, err;
 783
 784        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 785        argv[argc++] = "send-pack";
 786        argv[argc++] = "--stateless-rpc";
 787        argv[argc++] = "--helper-status";
 788        if (options.thin)
 789                argv[argc++] = "--thin";
 790        if (options.dry_run)
 791                argv[argc++] = "--dry-run";
 792        if (options.verbosity == 0)
 793                argv[argc++] = "--quiet";
 794        else if (options.verbosity > 1)
 795                argv[argc++] = "--verbose";
 796        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 797        argv[argc++] = url;
 798        for (i = 0; i < nr_spec; i++)
 799                argv[argc++] = specs[i];
 800        argv[argc++] = NULL;
 801
 802        memset(&rpc, 0, sizeof(rpc));
 803        rpc.service_name = "git-receive-pack",
 804        rpc.argv = argv;
 805
 806        err = rpc_service(&rpc, heads);
 807        if (rpc.result.len)
 808                safe_write(1, rpc.result.buf, rpc.result.len);
 809        strbuf_release(&rpc.result);
 810        free(argv);
 811        return err;
 812}
 813
 814static int push(int nr_spec, char **specs)
 815{
 816        struct discovery *heads = discover_refs("git-receive-pack");
 817        int ret;
 818
 819        if (heads->proto_git)
 820                ret = push_git(heads, nr_spec, specs);
 821        else
 822                ret = push_dav(nr_spec, specs);
 823        free_discovery(heads);
 824        return ret;
 825}
 826
 827static void parse_push(struct strbuf *buf)
 828{
 829        char **specs = NULL;
 830        int alloc_spec = 0, nr_spec = 0, i, ret;
 831
 832        do {
 833                if (!prefixcmp(buf->buf, "push ")) {
 834                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 835                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 836                }
 837                else
 838                        die("http transport does not support %s", buf->buf);
 839
 840                strbuf_reset(buf);
 841                if (strbuf_getline(buf, stdin, '\n') == EOF)
 842                        goto free_specs;
 843                if (!*buf->buf)
 844                        break;
 845        } while (1);
 846
 847        ret = push(nr_spec, specs);
 848        printf("\n");
 849        fflush(stdout);
 850
 851        if (ret)
 852                exit(128); /* error already reported */
 853
 854 free_specs:
 855        for (i = 0; i < nr_spec; i++)
 856                free(specs[i]);
 857        free(specs);
 858}
 859
 860int main(int argc, const char **argv)
 861{
 862        struct strbuf buf = STRBUF_INIT;
 863        int nongit;
 864
 865        git_extract_argv0_path(argv[0]);
 866        setup_git_directory_gently(&nongit);
 867        if (argc < 2) {
 868                fprintf(stderr, "Remote needed\n");
 869                return 1;
 870        }
 871
 872        options.verbosity = 1;
 873        options.progress = !!isatty(2);
 874        options.thin = 1;
 875
 876        remote = remote_get(argv[1]);
 877
 878        if (argc > 2) {
 879                end_url_with_slash(&buf, argv[2]);
 880        } else {
 881                end_url_with_slash(&buf, remote->url[0]);
 882        }
 883
 884        url = strbuf_detach(&buf, NULL);
 885
 886        http_init(remote, url, 0);
 887
 888        do {
 889                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 890                        if (ferror(stdin))
 891                                fprintf(stderr, "Error reading command stream\n");
 892                        else
 893                                fprintf(stderr, "Unexpected end of command stream\n");
 894                        return 1;
 895                }
 896                if (buf.len == 0)
 897                        break;
 898                if (!prefixcmp(buf.buf, "fetch ")) {
 899                        if (nongit)
 900                                die("Fetch attempted without a local repo");
 901                        parse_fetch(&buf);
 902
 903                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 904                        int for_push = !!strstr(buf.buf + 4, "for-push");
 905                        output_refs(get_refs(for_push));
 906
 907                } else if (!prefixcmp(buf.buf, "push ")) {
 908                        parse_push(&buf);
 909
 910                } else if (!prefixcmp(buf.buf, "option ")) {
 911                        char *name = buf.buf + strlen("option ");
 912                        char *value = strchr(name, ' ');
 913                        int result;
 914
 915                        if (value)
 916                                *value++ = '\0';
 917                        else
 918                                value = "true";
 919
 920                        result = set_option(name, value);
 921                        if (!result)
 922                                printf("ok\n");
 923                        else if (result < 0)
 924                                printf("error invalid value\n");
 925                        else
 926                                printf("unsupported\n");
 927                        fflush(stdout);
 928
 929                } else if (!strcmp(buf.buf, "capabilities")) {
 930                        printf("fetch\n");
 931                        printf("option\n");
 932                        printf("push\n");
 933                        printf("\n");
 934                        fflush(stdout);
 935                } else {
 936                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 937                        return 1;
 938                }
 939                strbuf_reset(&buf);
 940        } while (1);
 941
 942        http_cleanup();
 943
 944        return 0;
 945}