Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit oneway_merge(): only lstat() when told to update worktree (686b2de)
   1#include "cache.h"
   2#include "remote.h"
   3#include "strbuf.h"
   4#include "walker.h"
   5#include "http.h"
   6#include "exec_cmd.h"
   7#include "run-command.h"
   8#include "pkt-line.h"
   9#include "sideband.h"
  10
  11static struct remote *remote;
  12static const char *url; /* always ends with a trailing slash */
  13
  14struct options {
  15        int verbosity;
  16        unsigned long depth;
  17        unsigned progress : 1,
  18                followtags : 1,
  19                dry_run : 1,
  20                thin : 1;
  21};
  22static struct options options;
  23
  24static int set_option(const char *name, const char *value)
  25{
  26        if (!strcmp(name, "verbosity")) {
  27                char *end;
  28                int v = strtol(value, &end, 10);
  29                if (value == end || *end)
  30                        return -1;
  31                options.verbosity = v;
  32                return 0;
  33        }
  34        else if (!strcmp(name, "progress")) {
  35                if (!strcmp(value, "true"))
  36                        options.progress = 1;
  37                else if (!strcmp(value, "false"))
  38                        options.progress = 0;
  39                else
  40                        return -1;
  41                return 0;
  42        }
  43        else if (!strcmp(name, "depth")) {
  44                char *end;
  45                unsigned long v = strtoul(value, &end, 10);
  46                if (value == end || *end)
  47                        return -1;
  48                options.depth = v;
  49                return 0;
  50        }
  51        else if (!strcmp(name, "followtags")) {
  52                if (!strcmp(value, "true"))
  53                        options.followtags = 1;
  54                else if (!strcmp(value, "false"))
  55                        options.followtags = 0;
  56                else
  57                        return -1;
  58                return 0;
  59        }
  60        else if (!strcmp(name, "dry-run")) {
  61                if (!strcmp(value, "true"))
  62                        options.dry_run = 1;
  63                else if (!strcmp(value, "false"))
  64                        options.dry_run = 0;
  65                else
  66                        return -1;
  67                return 0;
  68        }
  69        else {
  70                return 1 /* unsupported */;
  71        }
  72}
  73
  74struct discovery {
  75        const char *service;
  76        char *buf_alloc;
  77        char *buf;
  78        size_t len;
  79        unsigned proto_git : 1;
  80};
  81static struct discovery *last_discovery;
  82
  83static void free_discovery(struct discovery *d)
  84{
  85        if (d) {
  86                if (d == last_discovery)
  87                        last_discovery = NULL;
  88                free(d->buf_alloc);
  89                free(d);
  90        }
  91}
  92
  93static struct discovery* discover_refs(const char *service)
  94{
  95        struct strbuf buffer = STRBUF_INIT;
  96        struct discovery *last = last_discovery;
  97        char *refs_url;
  98        int http_ret, is_http = 0;
  99
 100        if (last && !strcmp(service, last->service))
 101                return last;
 102        free_discovery(last);
 103
 104        strbuf_addf(&buffer, "%sinfo/refs", url);
 105        if (!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) {
 106                is_http = 1;
 107                if (!strchr(url, '?'))
 108                        strbuf_addch(&buffer, '?');
 109                else
 110                        strbuf_addch(&buffer, '&');
 111                strbuf_addf(&buffer, "service=%s", service);
 112        }
 113        refs_url = strbuf_detach(&buffer, NULL);
 114
 115        http_ret = http_get_strbuf(refs_url, &buffer, HTTP_NO_CACHE);
 116        switch (http_ret) {
 117        case HTTP_OK:
 118                break;
 119        case HTTP_MISSING_TARGET:
 120                die("%s not found: did you run git update-server-info on the"
 121                    " server?", refs_url);
 122        case HTTP_NOAUTH:
 123                die("Authentication failed");
 124        default:
 125                http_error(refs_url, http_ret);
 126                die("HTTP request failed");
 127        }
 128
 129        last= xcalloc(1, sizeof(*last_discovery));
 130        last->service = service;
 131        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 132        last->buf = last->buf_alloc;
 133
 134        if (is_http && 5 <= last->len && last->buf[4] == '#') {
 135                /* smart HTTP response; validate that the service
 136                 * pkt-line matches our request.
 137                 */
 138                struct strbuf exp = STRBUF_INIT;
 139
 140                if (packet_get_line(&buffer, &last->buf, &last->len) <= 0)
 141                        die("%s has invalid packet header", refs_url);
 142                if (buffer.len && buffer.buf[buffer.len - 1] == '\n')
 143                        strbuf_setlen(&buffer, buffer.len - 1);
 144
 145                strbuf_addf(&exp, "# service=%s", service);
 146                if (strbuf_cmp(&exp, &buffer))
 147                        die("invalid server response; got '%s'", buffer.buf);
 148                strbuf_release(&exp);
 149
 150                /* The header can include additional metadata lines, up
 151                 * until a packet flush marker.  Ignore these now, but
 152                 * in the future we might start to scan them.
 153                 */
 154                strbuf_reset(&buffer);
 155                while (packet_get_line(&buffer, &last->buf, &last->len) > 0)
 156                        strbuf_reset(&buffer);
 157
 158                last->proto_git = 1;
 159        }
 160
 161        free(refs_url);
 162        strbuf_release(&buffer);
 163        last_discovery = last;
 164        return last;
 165}
 166
 167static int write_discovery(int in, int out, void *data)
 168{
 169        struct discovery *heads = data;
 170        int err = 0;
 171        if (write_in_full(out, heads->buf, heads->len) != heads->len)
 172                err = 1;
 173        close(out);
 174        return err;
 175}
 176
 177static struct ref *parse_git_refs(struct discovery *heads, int for_push)
 178{
 179        struct ref *list = NULL;
 180        struct async async;
 181
 182        memset(&async, 0, sizeof(async));
 183        async.proc = write_discovery;
 184        async.data = heads;
 185        async.out = -1;
 186
 187        if (start_async(&async))
 188                die("cannot start thread to parse advertised refs");
 189        get_remote_heads(async.out, &list,
 190                        for_push ? REF_NORMAL : 0, NULL);
 191        close(async.out);
 192        if (finish_async(&async))
 193                die("ref parsing thread failed");
 194        return list;
 195}
 196
 197static struct ref *parse_info_refs(struct discovery *heads)
 198{
 199        char *data, *start, *mid;
 200        char *ref_name;
 201        int i = 0;
 202
 203        struct ref *refs = NULL;
 204        struct ref *ref = NULL;
 205        struct ref *last_ref = NULL;
 206
 207        data = heads->buf;
 208        start = NULL;
 209        mid = data;
 210        while (i < heads->len) {
 211                if (!start) {
 212                        start = &data[i];
 213                }
 214                if (data[i] == '\t')
 215                        mid = &data[i];
 216                if (data[i] == '\n') {
 217                        if (mid - start != 40)
 218                                die("%sinfo/refs not valid: is this a git repository?", url);
 219                        data[i] = 0;
 220                        ref_name = mid + 1;
 221                        ref = xmalloc(sizeof(struct ref) +
 222                                      strlen(ref_name) + 1);
 223                        memset(ref, 0, sizeof(struct ref));
 224                        strcpy(ref->name, ref_name);
 225                        get_sha1_hex(start, ref->old_sha1);
 226                        if (!refs)
 227                                refs = ref;
 228                        if (last_ref)
 229                                last_ref->next = ref;
 230                        last_ref = ref;
 231                        start = NULL;
 232                }
 233                i++;
 234        }
 235
 236        ref = alloc_ref("HEAD");
 237        if (!http_fetch_ref(url, ref) &&
 238            !resolve_remote_symref(ref, refs)) {
 239                ref->next = refs;
 240                refs = ref;
 241        } else {
 242                free(ref);
 243        }
 244
 245        return refs;
 246}
 247
 248static struct ref *get_refs(int for_push)
 249{
 250        struct discovery *heads;
 251
 252        if (for_push)
 253                heads = discover_refs("git-receive-pack");
 254        else
 255                heads = discover_refs("git-upload-pack");
 256
 257        if (heads->proto_git)
 258                return parse_git_refs(heads, for_push);
 259        return parse_info_refs(heads);
 260}
 261
 262static void output_refs(struct ref *refs)
 263{
 264        struct ref *posn;
 265        for (posn = refs; posn; posn = posn->next) {
 266                if (posn->symref)
 267                        printf("@%s %s\n", posn->symref, posn->name);
 268                else
 269                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 270        }
 271        printf("\n");
 272        fflush(stdout);
 273        free_refs(refs);
 274}
 275
 276struct rpc_state {
 277        const char *service_name;
 278        const char **argv;
 279        struct strbuf *stdin_preamble;
 280        char *service_url;
 281        char *hdr_content_type;
 282        char *hdr_accept;
 283        char *buf;
 284        size_t alloc;
 285        size_t len;
 286        size_t pos;
 287        int in;
 288        int out;
 289        struct strbuf result;
 290        unsigned gzip_request : 1;
 291        unsigned initial_buffer : 1;
 292};
 293
 294static size_t rpc_out(void *ptr, size_t eltsize,
 295                size_t nmemb, void *buffer_)
 296{
 297        size_t max = eltsize * nmemb;
 298        struct rpc_state *rpc = buffer_;
 299        size_t avail = rpc->len - rpc->pos;
 300
 301        if (!avail) {
 302                rpc->initial_buffer = 0;
 303                avail = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 304                if (!avail)
 305                        return 0;
 306                rpc->pos = 0;
 307                rpc->len = avail;
 308        }
 309
 310        if (max < avail)
 311                avail = max;
 312        memcpy(ptr, rpc->buf + rpc->pos, avail);
 313        rpc->pos += avail;
 314        return avail;
 315}
 316
 317#ifndef NO_CURL_IOCTL
 318static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 319{
 320        struct rpc_state *rpc = clientp;
 321
 322        switch (cmd) {
 323        case CURLIOCMD_NOP:
 324                return CURLIOE_OK;
 325
 326        case CURLIOCMD_RESTARTREAD:
 327                if (rpc->initial_buffer) {
 328                        rpc->pos = 0;
 329                        return CURLIOE_OK;
 330                }
 331                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 332                return CURLIOE_FAILRESTART;
 333
 334        default:
 335                return CURLIOE_UNKNOWNCMD;
 336        }
 337}
 338#endif
 339
 340static size_t rpc_in(char *ptr, size_t eltsize,
 341                size_t nmemb, void *buffer_)
 342{
 343        size_t size = eltsize * nmemb;
 344        struct rpc_state *rpc = buffer_;
 345        write_or_die(rpc->in, ptr, size);
 346        return size;
 347}
 348
 349static int run_slot(struct active_request_slot *slot)
 350{
 351        int err;
 352        struct slot_results results;
 353
 354        slot->results = &results;
 355        slot->curl_result = curl_easy_perform(slot->curl);
 356        finish_active_slot(slot);
 357
 358        err = handle_curl_result(slot, &results);
 359        if (err != HTTP_OK && err != HTTP_REAUTH) {
 360                error("RPC failed; result=%d, HTTP code = %ld",
 361                      results.curl_result, results.http_code);
 362        }
 363
 364        return err;
 365}
 366
 367static int probe_rpc(struct rpc_state *rpc)
 368{
 369        struct active_request_slot *slot;
 370        struct curl_slist *headers = NULL;
 371        struct strbuf buf = STRBUF_INIT;
 372        int err;
 373
 374        slot = get_active_slot();
 375
 376        headers = curl_slist_append(headers, rpc->hdr_content_type);
 377        headers = curl_slist_append(headers, rpc->hdr_accept);
 378
 379        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 380        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 381        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 382        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 383        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 384        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 385        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 386        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 387        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 388
 389        err = run_slot(slot);
 390
 391        curl_slist_free_all(headers);
 392        strbuf_release(&buf);
 393        return err;
 394}
 395
 396static int post_rpc(struct rpc_state *rpc)
 397{
 398        struct active_request_slot *slot;
 399        struct curl_slist *headers = NULL;
 400        int use_gzip = rpc->gzip_request;
 401        char *gzip_body = NULL;
 402        int err, large_request = 0;
 403
 404        /* Try to load the entire request, if we can fit it into the
 405         * allocated buffer space we can use HTTP/1.0 and avoid the
 406         * chunked encoding mess.
 407         */
 408        while (1) {
 409                size_t left = rpc->alloc - rpc->len;
 410                char *buf = rpc->buf + rpc->len;
 411                int n;
 412
 413                if (left < LARGE_PACKET_MAX) {
 414                        large_request = 1;
 415                        use_gzip = 0;
 416                        break;
 417                }
 418
 419                n = packet_read_line(rpc->out, buf, left);
 420                if (!n)
 421                        break;
 422                rpc->len += n;
 423        }
 424
 425        if (large_request) {
 426                do {
 427                        err = probe_rpc(rpc);
 428                } while (err == HTTP_REAUTH);
 429                if (err != HTTP_OK)
 430                        return -1;
 431        }
 432
 433        slot = get_active_slot();
 434
 435        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 436        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 437        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 438        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 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
 444        if (large_request) {
 445                /* The request body is large and the size cannot be predicted.
 446                 * We must use chunked encoding to send it.
 447                 */
 448                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 449                rpc->initial_buffer = 1;
 450                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 451                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 452#ifndef NO_CURL_IOCTL
 453                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 454                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 455#endif
 456                if (options.verbosity > 1) {
 457                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 458                        fflush(stderr);
 459                }
 460
 461        } else if (use_gzip && 1024 < rpc->len) {
 462                /* The client backend isn't giving us compressed data so
 463                 * we can try to deflate it ourselves, this may save on.
 464                 * the transfer time.
 465                 */
 466                size_t size;
 467                git_zstream stream;
 468                int ret;
 469
 470                memset(&stream, 0, sizeof(stream));
 471                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 472                size = git_deflate_bound(&stream, rpc->len);
 473                gzip_body = xmalloc(size);
 474
 475                stream.next_in = (unsigned char *)rpc->buf;
 476                stream.avail_in = rpc->len;
 477                stream.next_out = (unsigned char *)gzip_body;
 478                stream.avail_out = size;
 479
 480                ret = git_deflate(&stream, Z_FINISH);
 481                if (ret != Z_STREAM_END)
 482                        die("cannot deflate request; zlib deflate error %d", ret);
 483
 484                ret = git_deflate_end_gently(&stream);
 485                if (ret != Z_OK)
 486                        die("cannot deflate request; zlib end error %d", ret);
 487
 488                size = stream.total_out;
 489
 490                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 491                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 492                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, size);
 493
 494                if (options.verbosity > 1) {
 495                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 496                                rpc->service_name,
 497                                (unsigned long)rpc->len, (unsigned long)size);
 498                        fflush(stderr);
 499                }
 500        } else {
 501                /* We know the complete request size in advance, use the
 502                 * more normal Content-Length approach.
 503                 */
 504                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 505                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 506                if (options.verbosity > 1) {
 507                        fprintf(stderr, "POST %s (%lu bytes)\n",
 508                                rpc->service_name, (unsigned long)rpc->len);
 509                        fflush(stderr);
 510                }
 511        }
 512
 513        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 514        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 515        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 516
 517        do {
 518                err = run_slot(slot);
 519        } while (err == HTTP_REAUTH && !large_request && !use_gzip);
 520        if (err != HTTP_OK)
 521                err = -1;
 522
 523        curl_slist_free_all(headers);
 524        free(gzip_body);
 525        return err;
 526}
 527
 528static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 529{
 530        const char *svc = rpc->service_name;
 531        struct strbuf buf = STRBUF_INIT;
 532        struct strbuf *preamble = rpc->stdin_preamble;
 533        struct child_process client;
 534        int err = 0;
 535
 536        memset(&client, 0, sizeof(client));
 537        client.in = -1;
 538        client.out = -1;
 539        client.git_cmd = 1;
 540        client.argv = rpc->argv;
 541        if (start_command(&client))
 542                exit(1);
 543        if (preamble)
 544                write_or_die(client.in, preamble->buf, preamble->len);
 545        if (heads)
 546                write_or_die(client.in, heads->buf, heads->len);
 547
 548        rpc->alloc = http_post_buffer;
 549        rpc->buf = xmalloc(rpc->alloc);
 550        rpc->in = client.in;
 551        rpc->out = client.out;
 552        strbuf_init(&rpc->result, 0);
 553
 554        strbuf_addf(&buf, "%s%s", url, svc);
 555        rpc->service_url = strbuf_detach(&buf, NULL);
 556
 557        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 558        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 559
 560        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 561        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 562
 563        while (!err) {
 564                int n = packet_read_line(rpc->out, rpc->buf, rpc->alloc);
 565                if (!n)
 566                        break;
 567                rpc->pos = 0;
 568                rpc->len = n;
 569                err |= post_rpc(rpc);
 570        }
 571
 572        close(client.in);
 573        client.in = -1;
 574        if (!err) {
 575                strbuf_read(&rpc->result, client.out, 0);
 576        } else {
 577                char buf[4096];
 578                for (;;)
 579                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 580                                break;
 581        }
 582
 583        close(client.out);
 584        client.out = -1;
 585
 586        err |= finish_command(&client);
 587        free(rpc->service_url);
 588        free(rpc->hdr_content_type);
 589        free(rpc->hdr_accept);
 590        free(rpc->buf);
 591        strbuf_release(&buf);
 592        return err;
 593}
 594
 595static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 596{
 597        struct walker *walker;
 598        char **targets = xmalloc(nr_heads * sizeof(char*));
 599        int ret, i;
 600
 601        if (options.depth)
 602                die("dumb http transport does not support --depth");
 603        for (i = 0; i < nr_heads; i++)
 604                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 605
 606        walker = get_http_walker(url);
 607        walker->get_all = 1;
 608        walker->get_tree = 1;
 609        walker->get_history = 1;
 610        walker->get_verbosely = options.verbosity >= 3;
 611        walker->get_recover = 0;
 612        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 613        walker_free(walker);
 614
 615        for (i = 0; i < nr_heads; i++)
 616                free(targets[i]);
 617        free(targets);
 618
 619        return ret ? error("Fetch failed.") : 0;
 620}
 621
 622static int fetch_git(struct discovery *heads,
 623        int nr_heads, struct ref **to_fetch)
 624{
 625        struct rpc_state rpc;
 626        struct strbuf preamble = STRBUF_INIT;
 627        char *depth_arg = NULL;
 628        int argc = 0, i, err;
 629        const char *argv[15];
 630
 631        argv[argc++] = "fetch-pack";
 632        argv[argc++] = "--stateless-rpc";
 633        argv[argc++] = "--stdin";
 634        argv[argc++] = "--lock-pack";
 635        if (options.followtags)
 636                argv[argc++] = "--include-tag";
 637        if (options.thin)
 638                argv[argc++] = "--thin";
 639        if (options.verbosity >= 3) {
 640                argv[argc++] = "-v";
 641                argv[argc++] = "-v";
 642        }
 643        if (!options.progress)
 644                argv[argc++] = "--no-progress";
 645        if (options.depth) {
 646                struct strbuf buf = STRBUF_INIT;
 647                strbuf_addf(&buf, "--depth=%lu", options.depth);
 648                depth_arg = strbuf_detach(&buf, NULL);
 649                argv[argc++] = depth_arg;
 650        }
 651        argv[argc++] = url;
 652        argv[argc++] = NULL;
 653
 654        for (i = 0; i < nr_heads; i++) {
 655                struct ref *ref = to_fetch[i];
 656                if (!ref->name || !*ref->name)
 657                        die("cannot fetch by sha1 over smart http");
 658                packet_buf_write(&preamble, "%s\n", ref->name);
 659        }
 660        packet_buf_flush(&preamble);
 661
 662        memset(&rpc, 0, sizeof(rpc));
 663        rpc.service_name = "git-upload-pack",
 664        rpc.argv = argv;
 665        rpc.stdin_preamble = &preamble;
 666        rpc.gzip_request = 1;
 667
 668        err = rpc_service(&rpc, heads);
 669        if (rpc.result.len)
 670                safe_write(1, rpc.result.buf, rpc.result.len);
 671        strbuf_release(&rpc.result);
 672        strbuf_release(&preamble);
 673        free(depth_arg);
 674        return err;
 675}
 676
 677static int fetch(int nr_heads, struct ref **to_fetch)
 678{
 679        struct discovery *d = discover_refs("git-upload-pack");
 680        if (d->proto_git)
 681                return fetch_git(d, nr_heads, to_fetch);
 682        else
 683                return fetch_dumb(nr_heads, to_fetch);
 684}
 685
 686static void parse_fetch(struct strbuf *buf)
 687{
 688        struct ref **to_fetch = NULL;
 689        struct ref *list_head = NULL;
 690        struct ref **list = &list_head;
 691        int alloc_heads = 0, nr_heads = 0;
 692
 693        do {
 694                if (!prefixcmp(buf->buf, "fetch ")) {
 695                        char *p = buf->buf + strlen("fetch ");
 696                        char *name;
 697                        struct ref *ref;
 698                        unsigned char old_sha1[20];
 699
 700                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 701                                die("protocol error: expected sha/ref, got %s'", p);
 702                        if (p[40] == ' ')
 703                                name = p + 41;
 704                        else if (!p[40])
 705                                name = "";
 706                        else
 707                                die("protocol error: expected sha/ref, got %s'", p);
 708
 709                        ref = alloc_ref(name);
 710                        hashcpy(ref->old_sha1, old_sha1);
 711
 712                        *list = ref;
 713                        list = &ref->next;
 714
 715                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 716                        to_fetch[nr_heads++] = ref;
 717                }
 718                else
 719                        die("http transport does not support %s", buf->buf);
 720
 721                strbuf_reset(buf);
 722                if (strbuf_getline(buf, stdin, '\n') == EOF)
 723                        return;
 724                if (!*buf->buf)
 725                        break;
 726        } while (1);
 727
 728        if (fetch(nr_heads, to_fetch))
 729                exit(128); /* error already reported */
 730        free_refs(list_head);
 731        free(to_fetch);
 732
 733        printf("\n");
 734        fflush(stdout);
 735        strbuf_reset(buf);
 736}
 737
 738static int push_dav(int nr_spec, char **specs)
 739{
 740        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 741        int argc = 0, i;
 742
 743        argv[argc++] = "http-push";
 744        argv[argc++] = "--helper-status";
 745        if (options.dry_run)
 746                argv[argc++] = "--dry-run";
 747        if (options.verbosity > 1)
 748                argv[argc++] = "--verbose";
 749        argv[argc++] = url;
 750        for (i = 0; i < nr_spec; i++)
 751                argv[argc++] = specs[i];
 752        argv[argc++] = NULL;
 753
 754        if (run_command_v_opt(argv, RUN_GIT_CMD))
 755                die("git-%s failed", argv[0]);
 756        free(argv);
 757        return 0;
 758}
 759
 760static int push_git(struct discovery *heads, int nr_spec, char **specs)
 761{
 762        struct rpc_state rpc;
 763        const char **argv;
 764        int argc = 0, i, err;
 765
 766        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 767        argv[argc++] = "send-pack";
 768        argv[argc++] = "--stateless-rpc";
 769        argv[argc++] = "--helper-status";
 770        if (options.thin)
 771                argv[argc++] = "--thin";
 772        if (options.dry_run)
 773                argv[argc++] = "--dry-run";
 774        if (options.verbosity == 0)
 775                argv[argc++] = "--quiet";
 776        else if (options.verbosity > 1)
 777                argv[argc++] = "--verbose";
 778        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 779        argv[argc++] = url;
 780        for (i = 0; i < nr_spec; i++)
 781                argv[argc++] = specs[i];
 782        argv[argc++] = NULL;
 783
 784        memset(&rpc, 0, sizeof(rpc));
 785        rpc.service_name = "git-receive-pack",
 786        rpc.argv = argv;
 787
 788        err = rpc_service(&rpc, heads);
 789        if (rpc.result.len)
 790                safe_write(1, rpc.result.buf, rpc.result.len);
 791        strbuf_release(&rpc.result);
 792        free(argv);
 793        return err;
 794}
 795
 796static int push(int nr_spec, char **specs)
 797{
 798        struct discovery *heads = discover_refs("git-receive-pack");
 799        int ret;
 800
 801        if (heads->proto_git)
 802                ret = push_git(heads, nr_spec, specs);
 803        else
 804                ret = push_dav(nr_spec, specs);
 805        free_discovery(heads);
 806        return ret;
 807}
 808
 809static void parse_push(struct strbuf *buf)
 810{
 811        char **specs = NULL;
 812        int alloc_spec = 0, nr_spec = 0, i, ret;
 813
 814        do {
 815                if (!prefixcmp(buf->buf, "push ")) {
 816                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 817                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 818                }
 819                else
 820                        die("http transport does not support %s", buf->buf);
 821
 822                strbuf_reset(buf);
 823                if (strbuf_getline(buf, stdin, '\n') == EOF)
 824                        goto free_specs;
 825                if (!*buf->buf)
 826                        break;
 827        } while (1);
 828
 829        ret = push(nr_spec, specs);
 830        printf("\n");
 831        fflush(stdout);
 832
 833        if (ret)
 834                exit(128); /* error already reported */
 835
 836 free_specs:
 837        for (i = 0; i < nr_spec; i++)
 838                free(specs[i]);
 839        free(specs);
 840}
 841
 842int main(int argc, const char **argv)
 843{
 844        struct strbuf buf = STRBUF_INIT;
 845        int nongit;
 846
 847        git_extract_argv0_path(argv[0]);
 848        setup_git_directory_gently(&nongit);
 849        if (argc < 2) {
 850                fprintf(stderr, "Remote needed\n");
 851                return 1;
 852        }
 853
 854        options.verbosity = 1;
 855        options.progress = !!isatty(2);
 856        options.thin = 1;
 857
 858        remote = remote_get(argv[1]);
 859
 860        if (argc > 2) {
 861                end_url_with_slash(&buf, argv[2]);
 862        } else {
 863                end_url_with_slash(&buf, remote->url[0]);
 864        }
 865
 866        url = strbuf_detach(&buf, NULL);
 867
 868        http_init(remote, url, 0);
 869
 870        do {
 871                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 872                        if (ferror(stdin))
 873                                fprintf(stderr, "Error reading command stream\n");
 874                        else
 875                                fprintf(stderr, "Unexpected end of command stream\n");
 876                        return 1;
 877                }
 878                if (buf.len == 0)
 879                        break;
 880                if (!prefixcmp(buf.buf, "fetch ")) {
 881                        if (nongit)
 882                                die("Fetch attempted without a local repo");
 883                        parse_fetch(&buf);
 884
 885                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 886                        int for_push = !!strstr(buf.buf + 4, "for-push");
 887                        output_refs(get_refs(for_push));
 888
 889                } else if (!prefixcmp(buf.buf, "push ")) {
 890                        parse_push(&buf);
 891
 892                } else if (!prefixcmp(buf.buf, "option ")) {
 893                        char *name = buf.buf + strlen("option ");
 894                        char *value = strchr(name, ' ');
 895                        int result;
 896
 897                        if (value)
 898                                *value++ = '\0';
 899                        else
 900                                value = "true";
 901
 902                        result = set_option(name, value);
 903                        if (!result)
 904                                printf("ok\n");
 905                        else if (result < 0)
 906                                printf("error invalid value\n");
 907                        else
 908                                printf("unsupported\n");
 909                        fflush(stdout);
 910
 911                } else if (!strcmp(buf.buf, "capabilities")) {
 912                        printf("fetch\n");
 913                        printf("option\n");
 914                        printf("push\n");
 915                        printf("\n");
 916                        fflush(stdout);
 917                } else {
 918                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 919                        return 1;
 920                }
 921                strbuf_reset(&buf);
 922        } while (1);
 923
 924        http_cleanup();
 925
 926        return 0;
 927}