Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-hg: only update necessary revisions (d226945)
   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        struct ref *refs;
  80        unsigned proto_git : 1;
  81};
  82static struct discovery *last_discovery;
  83
  84static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  85{
  86        struct ref *list = NULL;
  87        get_remote_heads(-1, heads->buf, heads->len, &list,
  88                         for_push ? REF_NORMAL : 0, NULL);
  89        return list;
  90}
  91
  92static struct ref *parse_info_refs(struct discovery *heads)
  93{
  94        char *data, *start, *mid;
  95        char *ref_name;
  96        int i = 0;
  97
  98        struct ref *refs = NULL;
  99        struct ref *ref = NULL;
 100        struct ref *last_ref = NULL;
 101
 102        data = heads->buf;
 103        start = NULL;
 104        mid = data;
 105        while (i < heads->len) {
 106                if (!start) {
 107                        start = &data[i];
 108                }
 109                if (data[i] == '\t')
 110                        mid = &data[i];
 111                if (data[i] == '\n') {
 112                        if (mid - start != 40)
 113                                die("%sinfo/refs not valid: is this a git repository?", url);
 114                        data[i] = 0;
 115                        ref_name = mid + 1;
 116                        ref = xmalloc(sizeof(struct ref) +
 117                                      strlen(ref_name) + 1);
 118                        memset(ref, 0, sizeof(struct ref));
 119                        strcpy(ref->name, ref_name);
 120                        get_sha1_hex(start, ref->old_sha1);
 121                        if (!refs)
 122                                refs = ref;
 123                        if (last_ref)
 124                                last_ref->next = ref;
 125                        last_ref = ref;
 126                        start = NULL;
 127                }
 128                i++;
 129        }
 130
 131        ref = alloc_ref("HEAD");
 132        if (!http_fetch_ref(url, ref) &&
 133            !resolve_remote_symref(ref, refs)) {
 134                ref->next = refs;
 135                refs = ref;
 136        } else {
 137                free(ref);
 138        }
 139
 140        return refs;
 141}
 142
 143static void free_discovery(struct discovery *d)
 144{
 145        if (d) {
 146                if (d == last_discovery)
 147                        last_discovery = NULL;
 148                free(d->buf_alloc);
 149                free_refs(d->refs);
 150                free(d);
 151        }
 152}
 153
 154static int show_http_message(struct strbuf *type, struct strbuf *msg)
 155{
 156        const char *p, *eol;
 157
 158        /*
 159         * We only show text/plain parts, as other types are likely
 160         * to be ugly to look at on the user's terminal.
 161         *
 162         * TODO should handle "; charset=XXX", and re-encode into
 163         * logoutputencoding
 164         */
 165        if (strcasecmp(type->buf, "text/plain"))
 166                return -1;
 167
 168        strbuf_trim(msg);
 169        if (!msg->len)
 170                return -1;
 171
 172        p = msg->buf;
 173        do {
 174                eol = strchrnul(p, '\n');
 175                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 176                p = eol + 1;
 177        } while(*eol);
 178        return 0;
 179}
 180
 181static struct discovery* discover_refs(const char *service, int for_push)
 182{
 183        struct strbuf exp = STRBUF_INIT;
 184        struct strbuf type = STRBUF_INIT;
 185        struct strbuf buffer = STRBUF_INIT;
 186        struct discovery *last = last_discovery;
 187        char *refs_url;
 188        int http_ret, maybe_smart = 0;
 189
 190        if (last && !strcmp(service, last->service))
 191                return last;
 192        free_discovery(last);
 193
 194        strbuf_addf(&buffer, "%sinfo/refs", url);
 195        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 196             git_env_bool("GIT_SMART_HTTP", 1)) {
 197                maybe_smart = 1;
 198                if (!strchr(url, '?'))
 199                        strbuf_addch(&buffer, '?');
 200                else
 201                        strbuf_addch(&buffer, '&');
 202                strbuf_addf(&buffer, "service=%s", service);
 203        }
 204        refs_url = strbuf_detach(&buffer, NULL);
 205
 206        http_ret = http_get_strbuf(refs_url, &type, &buffer,
 207                                   HTTP_NO_CACHE | HTTP_KEEP_ERROR);
 208        switch (http_ret) {
 209        case HTTP_OK:
 210                break;
 211        case HTTP_MISSING_TARGET:
 212                show_http_message(&type, &buffer);
 213                die("repository '%s' not found", url);
 214        case HTTP_NOAUTH:
 215                show_http_message(&type, &buffer);
 216                die("Authentication failed for '%s'", url);
 217        default:
 218                show_http_message(&type, &buffer);
 219                die("unable to access '%s': %s", url, curl_errorstr);
 220        }
 221
 222        last= xcalloc(1, sizeof(*last_discovery));
 223        last->service = service;
 224        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 225        last->buf = last->buf_alloc;
 226
 227        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 228        if (maybe_smart &&
 229            (5 <= last->len && last->buf[4] == '#') &&
 230            !strbuf_cmp(&exp, &type)) {
 231                char *line;
 232
 233                /*
 234                 * smart HTTP response; validate that the service
 235                 * pkt-line matches our request.
 236                 */
 237                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 238
 239                strbuf_reset(&exp);
 240                strbuf_addf(&exp, "# service=%s", service);
 241                if (strcmp(line, exp.buf))
 242                        die("invalid server response; got '%s'", line);
 243                strbuf_release(&exp);
 244
 245                /* The header can include additional metadata lines, up
 246                 * until a packet flush marker.  Ignore these now, but
 247                 * in the future we might start to scan them.
 248                 */
 249                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 250                        ;
 251
 252                last->proto_git = 1;
 253        }
 254
 255        if (last->proto_git)
 256                last->refs = parse_git_refs(last, for_push);
 257        else
 258                last->refs = parse_info_refs(last);
 259
 260        free(refs_url);
 261        strbuf_release(&exp);
 262        strbuf_release(&type);
 263        strbuf_release(&buffer);
 264        last_discovery = last;
 265        return last;
 266}
 267
 268static struct ref *get_refs(int for_push)
 269{
 270        struct discovery *heads;
 271
 272        if (for_push)
 273                heads = discover_refs("git-receive-pack", for_push);
 274        else
 275                heads = discover_refs("git-upload-pack", for_push);
 276
 277        return heads->refs;
 278}
 279
 280static void output_refs(struct ref *refs)
 281{
 282        struct ref *posn;
 283        for (posn = refs; posn; posn = posn->next) {
 284                if (posn->symref)
 285                        printf("@%s %s\n", posn->symref, posn->name);
 286                else
 287                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 288        }
 289        printf("\n");
 290        fflush(stdout);
 291}
 292
 293struct rpc_state {
 294        const char *service_name;
 295        const char **argv;
 296        struct strbuf *stdin_preamble;
 297        char *service_url;
 298        char *hdr_content_type;
 299        char *hdr_accept;
 300        char *buf;
 301        size_t alloc;
 302        size_t len;
 303        size_t pos;
 304        int in;
 305        int out;
 306        struct strbuf result;
 307        unsigned gzip_request : 1;
 308        unsigned initial_buffer : 1;
 309};
 310
 311static size_t rpc_out(void *ptr, size_t eltsize,
 312                size_t nmemb, void *buffer_)
 313{
 314        size_t max = eltsize * nmemb;
 315        struct rpc_state *rpc = buffer_;
 316        size_t avail = rpc->len - rpc->pos;
 317
 318        if (!avail) {
 319                rpc->initial_buffer = 0;
 320                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 321                if (!avail)
 322                        return 0;
 323                rpc->pos = 0;
 324                rpc->len = avail;
 325        }
 326
 327        if (max < avail)
 328                avail = max;
 329        memcpy(ptr, rpc->buf + rpc->pos, avail);
 330        rpc->pos += avail;
 331        return avail;
 332}
 333
 334#ifndef NO_CURL_IOCTL
 335static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 336{
 337        struct rpc_state *rpc = clientp;
 338
 339        switch (cmd) {
 340        case CURLIOCMD_NOP:
 341                return CURLIOE_OK;
 342
 343        case CURLIOCMD_RESTARTREAD:
 344                if (rpc->initial_buffer) {
 345                        rpc->pos = 0;
 346                        return CURLIOE_OK;
 347                }
 348                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 349                return CURLIOE_FAILRESTART;
 350
 351        default:
 352                return CURLIOE_UNKNOWNCMD;
 353        }
 354}
 355#endif
 356
 357static size_t rpc_in(char *ptr, size_t eltsize,
 358                size_t nmemb, void *buffer_)
 359{
 360        size_t size = eltsize * nmemb;
 361        struct rpc_state *rpc = buffer_;
 362        write_or_die(rpc->in, ptr, size);
 363        return size;
 364}
 365
 366static int run_slot(struct active_request_slot *slot)
 367{
 368        int err;
 369        struct slot_results results;
 370
 371        slot->results = &results;
 372        slot->curl_result = curl_easy_perform(slot->curl);
 373        finish_active_slot(slot);
 374
 375        err = handle_curl_result(&results);
 376        if (err != HTTP_OK && err != HTTP_REAUTH) {
 377                error("RPC failed; result=%d, HTTP code = %ld",
 378                      results.curl_result, results.http_code);
 379        }
 380
 381        return err;
 382}
 383
 384static int probe_rpc(struct rpc_state *rpc)
 385{
 386        struct active_request_slot *slot;
 387        struct curl_slist *headers = NULL;
 388        struct strbuf buf = STRBUF_INIT;
 389        int err;
 390
 391        slot = get_active_slot();
 392
 393        headers = curl_slist_append(headers, rpc->hdr_content_type);
 394        headers = curl_slist_append(headers, rpc->hdr_accept);
 395
 396        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 397        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 398        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 399        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 400        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 401        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 402        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 403        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 404        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 405
 406        err = run_slot(slot);
 407
 408        curl_slist_free_all(headers);
 409        strbuf_release(&buf);
 410        return err;
 411}
 412
 413static int post_rpc(struct rpc_state *rpc)
 414{
 415        struct active_request_slot *slot;
 416        struct curl_slist *headers = NULL;
 417        int use_gzip = rpc->gzip_request;
 418        char *gzip_body = NULL;
 419        size_t gzip_size = 0;
 420        int err, large_request = 0;
 421
 422        /* Try to load the entire request, if we can fit it into the
 423         * allocated buffer space we can use HTTP/1.0 and avoid the
 424         * chunked encoding mess.
 425         */
 426        while (1) {
 427                size_t left = rpc->alloc - rpc->len;
 428                char *buf = rpc->buf + rpc->len;
 429                int n;
 430
 431                if (left < LARGE_PACKET_MAX) {
 432                        large_request = 1;
 433                        use_gzip = 0;
 434                        break;
 435                }
 436
 437                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 438                if (!n)
 439                        break;
 440                rpc->len += n;
 441        }
 442
 443        if (large_request) {
 444                do {
 445                        err = probe_rpc(rpc);
 446                } while (err == HTTP_REAUTH);
 447                if (err != HTTP_OK)
 448                        return -1;
 449        }
 450
 451        headers = curl_slist_append(headers, rpc->hdr_content_type);
 452        headers = curl_slist_append(headers, rpc->hdr_accept);
 453        headers = curl_slist_append(headers, "Expect:");
 454
 455retry:
 456        slot = get_active_slot();
 457
 458        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 459        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 460        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 461        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 462
 463        if (large_request) {
 464                /* The request body is large and the size cannot be predicted.
 465                 * We must use chunked encoding to send it.
 466                 */
 467                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 468                rpc->initial_buffer = 1;
 469                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 470                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 471#ifndef NO_CURL_IOCTL
 472                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 473                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 474#endif
 475                if (options.verbosity > 1) {
 476                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 477                        fflush(stderr);
 478                }
 479
 480        } else if (gzip_body) {
 481                /*
 482                 * If we are looping to retry authentication, then the previous
 483                 * run will have set up the headers and gzip buffer already,
 484                 * and we just need to send it.
 485                 */
 486                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 487                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 488
 489        } else if (use_gzip && 1024 < rpc->len) {
 490                /* The client backend isn't giving us compressed data so
 491                 * we can try to deflate it ourselves, this may save on.
 492                 * the transfer time.
 493                 */
 494                git_zstream stream;
 495                int ret;
 496
 497                memset(&stream, 0, sizeof(stream));
 498                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 499                gzip_size = git_deflate_bound(&stream, rpc->len);
 500                gzip_body = xmalloc(gzip_size);
 501
 502                stream.next_in = (unsigned char *)rpc->buf;
 503                stream.avail_in = rpc->len;
 504                stream.next_out = (unsigned char *)gzip_body;
 505                stream.avail_out = gzip_size;
 506
 507                ret = git_deflate(&stream, Z_FINISH);
 508                if (ret != Z_STREAM_END)
 509                        die("cannot deflate request; zlib deflate error %d", ret);
 510
 511                ret = git_deflate_end_gently(&stream);
 512                if (ret != Z_OK)
 513                        die("cannot deflate request; zlib end error %d", ret);
 514
 515                gzip_size = stream.total_out;
 516
 517                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 518                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 519                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 520
 521                if (options.verbosity > 1) {
 522                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 523                                rpc->service_name,
 524                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 525                        fflush(stderr);
 526                }
 527        } else {
 528                /* We know the complete request size in advance, use the
 529                 * more normal Content-Length approach.
 530                 */
 531                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 532                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 533                if (options.verbosity > 1) {
 534                        fprintf(stderr, "POST %s (%lu bytes)\n",
 535                                rpc->service_name, (unsigned long)rpc->len);
 536                        fflush(stderr);
 537                }
 538        }
 539
 540        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 541        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 542        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 543
 544        err = run_slot(slot);
 545        if (err == HTTP_REAUTH && !large_request)
 546                goto retry;
 547        if (err != HTTP_OK)
 548                err = -1;
 549
 550        curl_slist_free_all(headers);
 551        free(gzip_body);
 552        return err;
 553}
 554
 555static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 556{
 557        const char *svc = rpc->service_name;
 558        struct strbuf buf = STRBUF_INIT;
 559        struct strbuf *preamble = rpc->stdin_preamble;
 560        struct child_process client;
 561        int err = 0;
 562
 563        memset(&client, 0, sizeof(client));
 564        client.in = -1;
 565        client.out = -1;
 566        client.git_cmd = 1;
 567        client.argv = rpc->argv;
 568        if (start_command(&client))
 569                exit(1);
 570        if (preamble)
 571                write_or_die(client.in, preamble->buf, preamble->len);
 572        if (heads)
 573                write_or_die(client.in, heads->buf, heads->len);
 574
 575        rpc->alloc = http_post_buffer;
 576        rpc->buf = xmalloc(rpc->alloc);
 577        rpc->in = client.in;
 578        rpc->out = client.out;
 579        strbuf_init(&rpc->result, 0);
 580
 581        strbuf_addf(&buf, "%s%s", url, svc);
 582        rpc->service_url = strbuf_detach(&buf, NULL);
 583
 584        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 585        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 586
 587        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 588        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 589
 590        while (!err) {
 591                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 592                if (!n)
 593                        break;
 594                rpc->pos = 0;
 595                rpc->len = n;
 596                err |= post_rpc(rpc);
 597        }
 598
 599        close(client.in);
 600        client.in = -1;
 601        if (!err) {
 602                strbuf_read(&rpc->result, client.out, 0);
 603        } else {
 604                char buf[4096];
 605                for (;;)
 606                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 607                                break;
 608        }
 609
 610        close(client.out);
 611        client.out = -1;
 612
 613        err |= finish_command(&client);
 614        free(rpc->service_url);
 615        free(rpc->hdr_content_type);
 616        free(rpc->hdr_accept);
 617        free(rpc->buf);
 618        strbuf_release(&buf);
 619        return err;
 620}
 621
 622static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 623{
 624        struct walker *walker;
 625        char **targets = xmalloc(nr_heads * sizeof(char*));
 626        int ret, i;
 627
 628        if (options.depth)
 629                die("dumb http transport does not support --depth");
 630        for (i = 0; i < nr_heads; i++)
 631                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 632
 633        walker = get_http_walker(url);
 634        walker->get_all = 1;
 635        walker->get_tree = 1;
 636        walker->get_history = 1;
 637        walker->get_verbosely = options.verbosity >= 3;
 638        walker->get_recover = 0;
 639        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 640        walker_free(walker);
 641
 642        for (i = 0; i < nr_heads; i++)
 643                free(targets[i]);
 644        free(targets);
 645
 646        return ret ? error("Fetch failed.") : 0;
 647}
 648
 649static int fetch_git(struct discovery *heads,
 650        int nr_heads, struct ref **to_fetch)
 651{
 652        struct rpc_state rpc;
 653        struct strbuf preamble = STRBUF_INIT;
 654        char *depth_arg = NULL;
 655        int argc = 0, i, err;
 656        const char *argv[15];
 657
 658        argv[argc++] = "fetch-pack";
 659        argv[argc++] = "--stateless-rpc";
 660        argv[argc++] = "--stdin";
 661        argv[argc++] = "--lock-pack";
 662        if (options.followtags)
 663                argv[argc++] = "--include-tag";
 664        if (options.thin)
 665                argv[argc++] = "--thin";
 666        if (options.verbosity >= 3) {
 667                argv[argc++] = "-v";
 668                argv[argc++] = "-v";
 669        }
 670        if (!options.progress)
 671                argv[argc++] = "--no-progress";
 672        if (options.depth) {
 673                struct strbuf buf = STRBUF_INIT;
 674                strbuf_addf(&buf, "--depth=%lu", options.depth);
 675                depth_arg = strbuf_detach(&buf, NULL);
 676                argv[argc++] = depth_arg;
 677        }
 678        argv[argc++] = url;
 679        argv[argc++] = NULL;
 680
 681        for (i = 0; i < nr_heads; i++) {
 682                struct ref *ref = to_fetch[i];
 683                if (!ref->name || !*ref->name)
 684                        die("cannot fetch by sha1 over smart http");
 685                packet_buf_write(&preamble, "%s\n", ref->name);
 686        }
 687        packet_buf_flush(&preamble);
 688
 689        memset(&rpc, 0, sizeof(rpc));
 690        rpc.service_name = "git-upload-pack",
 691        rpc.argv = argv;
 692        rpc.stdin_preamble = &preamble;
 693        rpc.gzip_request = 1;
 694
 695        err = rpc_service(&rpc, heads);
 696        if (rpc.result.len)
 697                write_or_die(1, rpc.result.buf, rpc.result.len);
 698        strbuf_release(&rpc.result);
 699        strbuf_release(&preamble);
 700        free(depth_arg);
 701        return err;
 702}
 703
 704static int fetch(int nr_heads, struct ref **to_fetch)
 705{
 706        struct discovery *d = discover_refs("git-upload-pack", 0);
 707        if (d->proto_git)
 708                return fetch_git(d, nr_heads, to_fetch);
 709        else
 710                return fetch_dumb(nr_heads, to_fetch);
 711}
 712
 713static void parse_fetch(struct strbuf *buf)
 714{
 715        struct ref **to_fetch = NULL;
 716        struct ref *list_head = NULL;
 717        struct ref **list = &list_head;
 718        int alloc_heads = 0, nr_heads = 0;
 719
 720        do {
 721                if (!prefixcmp(buf->buf, "fetch ")) {
 722                        char *p = buf->buf + strlen("fetch ");
 723                        char *name;
 724                        struct ref *ref;
 725                        unsigned char old_sha1[20];
 726
 727                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 728                                die("protocol error: expected sha/ref, got %s'", p);
 729                        if (p[40] == ' ')
 730                                name = p + 41;
 731                        else if (!p[40])
 732                                name = "";
 733                        else
 734                                die("protocol error: expected sha/ref, got %s'", p);
 735
 736                        ref = alloc_ref(name);
 737                        hashcpy(ref->old_sha1, old_sha1);
 738
 739                        *list = ref;
 740                        list = &ref->next;
 741
 742                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 743                        to_fetch[nr_heads++] = ref;
 744                }
 745                else
 746                        die("http transport does not support %s", buf->buf);
 747
 748                strbuf_reset(buf);
 749                if (strbuf_getline(buf, stdin, '\n') == EOF)
 750                        return;
 751                if (!*buf->buf)
 752                        break;
 753        } while (1);
 754
 755        if (fetch(nr_heads, to_fetch))
 756                exit(128); /* error already reported */
 757        free_refs(list_head);
 758        free(to_fetch);
 759
 760        printf("\n");
 761        fflush(stdout);
 762        strbuf_reset(buf);
 763}
 764
 765static int push_dav(int nr_spec, char **specs)
 766{
 767        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 768        int argc = 0, i;
 769
 770        argv[argc++] = "http-push";
 771        argv[argc++] = "--helper-status";
 772        if (options.dry_run)
 773                argv[argc++] = "--dry-run";
 774        if (options.verbosity > 1)
 775                argv[argc++] = "--verbose";
 776        argv[argc++] = url;
 777        for (i = 0; i < nr_spec; i++)
 778                argv[argc++] = specs[i];
 779        argv[argc++] = NULL;
 780
 781        if (run_command_v_opt(argv, RUN_GIT_CMD))
 782                die("git-%s failed", argv[0]);
 783        free(argv);
 784        return 0;
 785}
 786
 787static int push_git(struct discovery *heads, int nr_spec, char **specs)
 788{
 789        struct rpc_state rpc;
 790        const char **argv;
 791        int argc = 0, i, err;
 792
 793        argv = xmalloc((10 + nr_spec) * sizeof(char*));
 794        argv[argc++] = "send-pack";
 795        argv[argc++] = "--stateless-rpc";
 796        argv[argc++] = "--helper-status";
 797        if (options.thin)
 798                argv[argc++] = "--thin";
 799        if (options.dry_run)
 800                argv[argc++] = "--dry-run";
 801        if (options.verbosity == 0)
 802                argv[argc++] = "--quiet";
 803        else if (options.verbosity > 1)
 804                argv[argc++] = "--verbose";
 805        argv[argc++] = options.progress ? "--progress" : "--no-progress";
 806        argv[argc++] = url;
 807        for (i = 0; i < nr_spec; i++)
 808                argv[argc++] = specs[i];
 809        argv[argc++] = NULL;
 810
 811        memset(&rpc, 0, sizeof(rpc));
 812        rpc.service_name = "git-receive-pack",
 813        rpc.argv = argv;
 814
 815        err = rpc_service(&rpc, heads);
 816        if (rpc.result.len)
 817                write_or_die(1, rpc.result.buf, rpc.result.len);
 818        strbuf_release(&rpc.result);
 819        free(argv);
 820        return err;
 821}
 822
 823static int push(int nr_spec, char **specs)
 824{
 825        struct discovery *heads = discover_refs("git-receive-pack", 1);
 826        int ret;
 827
 828        if (heads->proto_git)
 829                ret = push_git(heads, nr_spec, specs);
 830        else
 831                ret = push_dav(nr_spec, specs);
 832        free_discovery(heads);
 833        return ret;
 834}
 835
 836static void parse_push(struct strbuf *buf)
 837{
 838        char **specs = NULL;
 839        int alloc_spec = 0, nr_spec = 0, i, ret;
 840
 841        do {
 842                if (!prefixcmp(buf->buf, "push ")) {
 843                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 844                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 845                }
 846                else
 847                        die("http transport does not support %s", buf->buf);
 848
 849                strbuf_reset(buf);
 850                if (strbuf_getline(buf, stdin, '\n') == EOF)
 851                        goto free_specs;
 852                if (!*buf->buf)
 853                        break;
 854        } while (1);
 855
 856        ret = push(nr_spec, specs);
 857        printf("\n");
 858        fflush(stdout);
 859
 860        if (ret)
 861                exit(128); /* error already reported */
 862
 863 free_specs:
 864        for (i = 0; i < nr_spec; i++)
 865                free(specs[i]);
 866        free(specs);
 867}
 868
 869int main(int argc, const char **argv)
 870{
 871        struct strbuf buf = STRBUF_INIT;
 872        int nongit;
 873
 874        git_extract_argv0_path(argv[0]);
 875        setup_git_directory_gently(&nongit);
 876        if (argc < 2) {
 877                fprintf(stderr, "Remote needed\n");
 878                return 1;
 879        }
 880
 881        options.verbosity = 1;
 882        options.progress = !!isatty(2);
 883        options.thin = 1;
 884
 885        remote = remote_get(argv[1]);
 886
 887        if (argc > 2) {
 888                end_url_with_slash(&buf, argv[2]);
 889        } else {
 890                end_url_with_slash(&buf, remote->url[0]);
 891        }
 892
 893        url = strbuf_detach(&buf, NULL);
 894
 895        http_init(remote, url, 0);
 896
 897        do {
 898                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 899                        if (ferror(stdin))
 900                                fprintf(stderr, "Error reading command stream\n");
 901                        else
 902                                fprintf(stderr, "Unexpected end of command stream\n");
 903                        return 1;
 904                }
 905                if (buf.len == 0)
 906                        break;
 907                if (!prefixcmp(buf.buf, "fetch ")) {
 908                        if (nongit)
 909                                die("Fetch attempted without a local repo");
 910                        parse_fetch(&buf);
 911
 912                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 913                        int for_push = !!strstr(buf.buf + 4, "for-push");
 914                        output_refs(get_refs(for_push));
 915
 916                } else if (!prefixcmp(buf.buf, "push ")) {
 917                        parse_push(&buf);
 918
 919                } else if (!prefixcmp(buf.buf, "option ")) {
 920                        char *name = buf.buf + strlen("option ");
 921                        char *value = strchr(name, ' ');
 922                        int result;
 923
 924                        if (value)
 925                                *value++ = '\0';
 926                        else
 927                                value = "true";
 928
 929                        result = set_option(name, value);
 930                        if (!result)
 931                                printf("ok\n");
 932                        else if (result < 0)
 933                                printf("error invalid value\n");
 934                        else
 935                                printf("unsupported\n");
 936                        fflush(stdout);
 937
 938                } else if (!strcmp(buf.buf, "capabilities")) {
 939                        printf("fetch\n");
 940                        printf("option\n");
 941                        printf("push\n");
 942                        printf("\n");
 943                        fflush(stdout);
 944                } else {
 945                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 946                        return 1;
 947                }
 948                strbuf_reset(&buf);
 949        } while (1);
 950
 951        http_cleanup();
 952
 953        return 0;
 954}