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