Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit http: update base URLs when we see redirects (c93c92f)
   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#include "argv-array.h"
  11#include "credential.h"
  12
  13static struct remote *remote;
  14static const char *url; /* always ends with a trailing slash */
  15
  16struct options {
  17        int verbosity;
  18        unsigned long depth;
  19        unsigned progress : 1,
  20                followtags : 1,
  21                dry_run : 1,
  22                thin : 1;
  23};
  24static struct options options;
  25
  26static int set_option(const char *name, const char *value)
  27{
  28        if (!strcmp(name, "verbosity")) {
  29                char *end;
  30                int v = strtol(value, &end, 10);
  31                if (value == end || *end)
  32                        return -1;
  33                options.verbosity = v;
  34                return 0;
  35        }
  36        else if (!strcmp(name, "progress")) {
  37                if (!strcmp(value, "true"))
  38                        options.progress = 1;
  39                else if (!strcmp(value, "false"))
  40                        options.progress = 0;
  41                else
  42                        return -1;
  43                return 0;
  44        }
  45        else if (!strcmp(name, "depth")) {
  46                char *end;
  47                unsigned long v = strtoul(value, &end, 10);
  48                if (value == end || *end)
  49                        return -1;
  50                options.depth = v;
  51                return 0;
  52        }
  53        else if (!strcmp(name, "followtags")) {
  54                if (!strcmp(value, "true"))
  55                        options.followtags = 1;
  56                else if (!strcmp(value, "false"))
  57                        options.followtags = 0;
  58                else
  59                        return -1;
  60                return 0;
  61        }
  62        else if (!strcmp(name, "dry-run")) {
  63                if (!strcmp(value, "true"))
  64                        options.dry_run = 1;
  65                else if (!strcmp(value, "false"))
  66                        options.dry_run = 0;
  67                else
  68                        return -1;
  69                return 0;
  70        }
  71        else {
  72                return 1 /* unsupported */;
  73        }
  74}
  75
  76struct discovery {
  77        const char *service;
  78        char *buf_alloc;
  79        char *buf;
  80        size_t len;
  81        struct ref *refs;
  82        unsigned proto_git : 1;
  83};
  84static struct discovery *last_discovery;
  85
  86static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  87{
  88        struct ref *list = NULL;
  89        get_remote_heads(-1, heads->buf, heads->len, &list,
  90                         for_push ? REF_NORMAL : 0, NULL);
  91        return list;
  92}
  93
  94static struct ref *parse_info_refs(struct discovery *heads)
  95{
  96        char *data, *start, *mid;
  97        char *ref_name;
  98        int i = 0;
  99
 100        struct ref *refs = NULL;
 101        struct ref *ref = NULL;
 102        struct ref *last_ref = NULL;
 103
 104        data = heads->buf;
 105        start = NULL;
 106        mid = data;
 107        while (i < heads->len) {
 108                if (!start) {
 109                        start = &data[i];
 110                }
 111                if (data[i] == '\t')
 112                        mid = &data[i];
 113                if (data[i] == '\n') {
 114                        if (mid - start != 40)
 115                                die("%sinfo/refs not valid: is this a git repository?", url);
 116                        data[i] = 0;
 117                        ref_name = mid + 1;
 118                        ref = xmalloc(sizeof(struct ref) +
 119                                      strlen(ref_name) + 1);
 120                        memset(ref, 0, sizeof(struct ref));
 121                        strcpy(ref->name, ref_name);
 122                        get_sha1_hex(start, ref->old_sha1);
 123                        if (!refs)
 124                                refs = ref;
 125                        if (last_ref)
 126                                last_ref->next = ref;
 127                        last_ref = ref;
 128                        start = NULL;
 129                }
 130                i++;
 131        }
 132
 133        ref = alloc_ref("HEAD");
 134        if (!http_fetch_ref(url, ref) &&
 135            !resolve_remote_symref(ref, refs)) {
 136                ref->next = refs;
 137                refs = ref;
 138        } else {
 139                free(ref);
 140        }
 141
 142        return refs;
 143}
 144
 145static void free_discovery(struct discovery *d)
 146{
 147        if (d) {
 148                if (d == last_discovery)
 149                        last_discovery = NULL;
 150                free(d->buf_alloc);
 151                free_refs(d->refs);
 152                free(d);
 153        }
 154}
 155
 156static int show_http_message(struct strbuf *type, struct strbuf *msg)
 157{
 158        const char *p, *eol;
 159
 160        /*
 161         * We only show text/plain parts, as other types are likely
 162         * to be ugly to look at on the user's terminal.
 163         *
 164         * TODO should handle "; charset=XXX", and re-encode into
 165         * logoutputencoding
 166         */
 167        if (strcasecmp(type->buf, "text/plain"))
 168                return -1;
 169
 170        strbuf_trim(msg);
 171        if (!msg->len)
 172                return -1;
 173
 174        p = msg->buf;
 175        do {
 176                eol = strchrnul(p, '\n');
 177                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 178                p = eol + 1;
 179        } while(*eol);
 180        return 0;
 181}
 182
 183static struct discovery* discover_refs(const char *service, int for_push)
 184{
 185        struct strbuf exp = STRBUF_INIT;
 186        struct strbuf type = STRBUF_INIT;
 187        struct strbuf buffer = STRBUF_INIT;
 188        struct discovery *last = last_discovery;
 189        char *refs_url;
 190        int http_ret, maybe_smart = 0;
 191        struct http_get_options options;
 192
 193        if (last && !strcmp(service, last->service))
 194                return last;
 195        free_discovery(last);
 196
 197        strbuf_addf(&buffer, "%sinfo/refs", url);
 198        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 199             git_env_bool("GIT_SMART_HTTP", 1)) {
 200                maybe_smart = 1;
 201                if (!strchr(url, '?'))
 202                        strbuf_addch(&buffer, '?');
 203                else
 204                        strbuf_addch(&buffer, '&');
 205                strbuf_addf(&buffer, "service=%s", service);
 206        }
 207        refs_url = strbuf_detach(&buffer, NULL);
 208
 209        memset(&options, 0, sizeof(options));
 210        options.content_type = &type;
 211        options.no_cache = 1;
 212        options.keep_error = 1;
 213
 214        http_ret = http_get_strbuf(refs_url, &buffer, &options);
 215        switch (http_ret) {
 216        case HTTP_OK:
 217                break;
 218        case HTTP_MISSING_TARGET:
 219                show_http_message(&type, &buffer);
 220                die("repository '%s' not found", url);
 221        case HTTP_NOAUTH:
 222                show_http_message(&type, &buffer);
 223                die("Authentication failed for '%s'", url);
 224        default:
 225                show_http_message(&type, &buffer);
 226                die("unable to access '%s': %s", url, curl_errorstr);
 227        }
 228
 229        last= xcalloc(1, sizeof(*last_discovery));
 230        last->service = service;
 231        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 232        last->buf = last->buf_alloc;
 233
 234        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 235        if (maybe_smart &&
 236            (5 <= last->len && last->buf[4] == '#') &&
 237            !strbuf_cmp(&exp, &type)) {
 238                char *line;
 239
 240                /*
 241                 * smart HTTP response; validate that the service
 242                 * pkt-line matches our request.
 243                 */
 244                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 245
 246                strbuf_reset(&exp);
 247                strbuf_addf(&exp, "# service=%s", service);
 248                if (strcmp(line, exp.buf))
 249                        die("invalid server response; got '%s'", line);
 250                strbuf_release(&exp);
 251
 252                /* The header can include additional metadata lines, up
 253                 * until a packet flush marker.  Ignore these now, but
 254                 * in the future we might start to scan them.
 255                 */
 256                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 257                        ;
 258
 259                last->proto_git = 1;
 260        }
 261
 262        if (last->proto_git)
 263                last->refs = parse_git_refs(last, for_push);
 264        else
 265                last->refs = parse_info_refs(last);
 266
 267        free(refs_url);
 268        strbuf_release(&exp);
 269        strbuf_release(&type);
 270        strbuf_release(&buffer);
 271        last_discovery = last;
 272        return last;
 273}
 274
 275static struct ref *get_refs(int for_push)
 276{
 277        struct discovery *heads;
 278
 279        if (for_push)
 280                heads = discover_refs("git-receive-pack", for_push);
 281        else
 282                heads = discover_refs("git-upload-pack", for_push);
 283
 284        return heads->refs;
 285}
 286
 287static void output_refs(struct ref *refs)
 288{
 289        struct ref *posn;
 290        for (posn = refs; posn; posn = posn->next) {
 291                if (posn->symref)
 292                        printf("@%s %s\n", posn->symref, posn->name);
 293                else
 294                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 295        }
 296        printf("\n");
 297        fflush(stdout);
 298}
 299
 300struct rpc_state {
 301        const char *service_name;
 302        const char **argv;
 303        struct strbuf *stdin_preamble;
 304        char *service_url;
 305        char *hdr_content_type;
 306        char *hdr_accept;
 307        char *buf;
 308        size_t alloc;
 309        size_t len;
 310        size_t pos;
 311        int in;
 312        int out;
 313        struct strbuf result;
 314        unsigned gzip_request : 1;
 315        unsigned initial_buffer : 1;
 316};
 317
 318static size_t rpc_out(void *ptr, size_t eltsize,
 319                size_t nmemb, void *buffer_)
 320{
 321        size_t max = eltsize * nmemb;
 322        struct rpc_state *rpc = buffer_;
 323        size_t avail = rpc->len - rpc->pos;
 324
 325        if (!avail) {
 326                rpc->initial_buffer = 0;
 327                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 328                if (!avail)
 329                        return 0;
 330                rpc->pos = 0;
 331                rpc->len = avail;
 332        }
 333
 334        if (max < avail)
 335                avail = max;
 336        memcpy(ptr, rpc->buf + rpc->pos, avail);
 337        rpc->pos += avail;
 338        return avail;
 339}
 340
 341#ifndef NO_CURL_IOCTL
 342static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 343{
 344        struct rpc_state *rpc = clientp;
 345
 346        switch (cmd) {
 347        case CURLIOCMD_NOP:
 348                return CURLIOE_OK;
 349
 350        case CURLIOCMD_RESTARTREAD:
 351                if (rpc->initial_buffer) {
 352                        rpc->pos = 0;
 353                        return CURLIOE_OK;
 354                }
 355                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 356                return CURLIOE_FAILRESTART;
 357
 358        default:
 359                return CURLIOE_UNKNOWNCMD;
 360        }
 361}
 362#endif
 363
 364static size_t rpc_in(char *ptr, size_t eltsize,
 365                size_t nmemb, void *buffer_)
 366{
 367        size_t size = eltsize * nmemb;
 368        struct rpc_state *rpc = buffer_;
 369        write_or_die(rpc->in, ptr, size);
 370        return size;
 371}
 372
 373static int run_slot(struct active_request_slot *slot)
 374{
 375        int err;
 376        struct slot_results results;
 377
 378        slot->results = &results;
 379        slot->curl_result = curl_easy_perform(slot->curl);
 380        finish_active_slot(slot);
 381
 382        err = handle_curl_result(&results);
 383        if (err != HTTP_OK && err != HTTP_REAUTH) {
 384                error("RPC failed; result=%d, HTTP code = %ld",
 385                      results.curl_result, results.http_code);
 386        }
 387
 388        return err;
 389}
 390
 391static int probe_rpc(struct rpc_state *rpc)
 392{
 393        struct active_request_slot *slot;
 394        struct curl_slist *headers = NULL;
 395        struct strbuf buf = STRBUF_INIT;
 396        int err;
 397
 398        slot = get_active_slot();
 399
 400        headers = curl_slist_append(headers, rpc->hdr_content_type);
 401        headers = curl_slist_append(headers, rpc->hdr_accept);
 402
 403        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 404        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 405        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 406        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 407        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 408        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 409        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 410        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 411        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 412
 413        err = run_slot(slot);
 414
 415        curl_slist_free_all(headers);
 416        strbuf_release(&buf);
 417        return err;
 418}
 419
 420static int post_rpc(struct rpc_state *rpc)
 421{
 422        struct active_request_slot *slot;
 423        struct curl_slist *headers = NULL;
 424        int use_gzip = rpc->gzip_request;
 425        char *gzip_body = NULL;
 426        size_t gzip_size = 0;
 427        int err, large_request = 0;
 428
 429        /* Try to load the entire request, if we can fit it into the
 430         * allocated buffer space we can use HTTP/1.0 and avoid the
 431         * chunked encoding mess.
 432         */
 433        while (1) {
 434                size_t left = rpc->alloc - rpc->len;
 435                char *buf = rpc->buf + rpc->len;
 436                int n;
 437
 438                if (left < LARGE_PACKET_MAX) {
 439                        large_request = 1;
 440                        use_gzip = 0;
 441                        break;
 442                }
 443
 444                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 445                if (!n)
 446                        break;
 447                rpc->len += n;
 448        }
 449
 450        if (large_request) {
 451                do {
 452                        err = probe_rpc(rpc);
 453                        if (err == HTTP_REAUTH)
 454                                credential_fill(&http_auth);
 455                } while (err == HTTP_REAUTH);
 456                if (err != HTTP_OK)
 457                        return -1;
 458        }
 459
 460        headers = curl_slist_append(headers, rpc->hdr_content_type);
 461        headers = curl_slist_append(headers, rpc->hdr_accept);
 462        headers = curl_slist_append(headers, "Expect:");
 463
 464retry:
 465        slot = get_active_slot();
 466
 467        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 468        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 469        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 470        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 471
 472        if (large_request) {
 473                /* The request body is large and the size cannot be predicted.
 474                 * We must use chunked encoding to send it.
 475                 */
 476                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 477                rpc->initial_buffer = 1;
 478                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 479                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 480#ifndef NO_CURL_IOCTL
 481                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 482                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 483#endif
 484                if (options.verbosity > 1) {
 485                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 486                        fflush(stderr);
 487                }
 488
 489        } else if (gzip_body) {
 490                /*
 491                 * If we are looping to retry authentication, then the previous
 492                 * run will have set up the headers and gzip buffer already,
 493                 * and we just need to send it.
 494                 */
 495                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 496                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 497
 498        } else if (use_gzip && 1024 < rpc->len) {
 499                /* The client backend isn't giving us compressed data so
 500                 * we can try to deflate it ourselves, this may save on.
 501                 * the transfer time.
 502                 */
 503                git_zstream stream;
 504                int ret;
 505
 506                memset(&stream, 0, sizeof(stream));
 507                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 508                gzip_size = git_deflate_bound(&stream, rpc->len);
 509                gzip_body = xmalloc(gzip_size);
 510
 511                stream.next_in = (unsigned char *)rpc->buf;
 512                stream.avail_in = rpc->len;
 513                stream.next_out = (unsigned char *)gzip_body;
 514                stream.avail_out = gzip_size;
 515
 516                ret = git_deflate(&stream, Z_FINISH);
 517                if (ret != Z_STREAM_END)
 518                        die("cannot deflate request; zlib deflate error %d", ret);
 519
 520                ret = git_deflate_end_gently(&stream);
 521                if (ret != Z_OK)
 522                        die("cannot deflate request; zlib end error %d", ret);
 523
 524                gzip_size = stream.total_out;
 525
 526                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 527                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 528                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 529
 530                if (options.verbosity > 1) {
 531                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 532                                rpc->service_name,
 533                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 534                        fflush(stderr);
 535                }
 536        } else {
 537                /* We know the complete request size in advance, use the
 538                 * more normal Content-Length approach.
 539                 */
 540                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 541                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 542                if (options.verbosity > 1) {
 543                        fprintf(stderr, "POST %s (%lu bytes)\n",
 544                                rpc->service_name, (unsigned long)rpc->len);
 545                        fflush(stderr);
 546                }
 547        }
 548
 549        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 550        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 551        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 552
 553        err = run_slot(slot);
 554        if (err == HTTP_REAUTH && !large_request) {
 555                credential_fill(&http_auth);
 556                goto retry;
 557        }
 558        if (err != HTTP_OK)
 559                err = -1;
 560
 561        curl_slist_free_all(headers);
 562        free(gzip_body);
 563        return err;
 564}
 565
 566static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 567{
 568        const char *svc = rpc->service_name;
 569        struct strbuf buf = STRBUF_INIT;
 570        struct strbuf *preamble = rpc->stdin_preamble;
 571        struct child_process client;
 572        int err = 0;
 573
 574        memset(&client, 0, sizeof(client));
 575        client.in = -1;
 576        client.out = -1;
 577        client.git_cmd = 1;
 578        client.argv = rpc->argv;
 579        if (start_command(&client))
 580                exit(1);
 581        if (preamble)
 582                write_or_die(client.in, preamble->buf, preamble->len);
 583        if (heads)
 584                write_or_die(client.in, heads->buf, heads->len);
 585
 586        rpc->alloc = http_post_buffer;
 587        rpc->buf = xmalloc(rpc->alloc);
 588        rpc->in = client.in;
 589        rpc->out = client.out;
 590        strbuf_init(&rpc->result, 0);
 591
 592        strbuf_addf(&buf, "%s%s", url, svc);
 593        rpc->service_url = strbuf_detach(&buf, NULL);
 594
 595        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 596        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 597
 598        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 599        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 600
 601        while (!err) {
 602                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 603                if (!n)
 604                        break;
 605                rpc->pos = 0;
 606                rpc->len = n;
 607                err |= post_rpc(rpc);
 608        }
 609
 610        close(client.in);
 611        client.in = -1;
 612        if (!err) {
 613                strbuf_read(&rpc->result, client.out, 0);
 614        } else {
 615                char buf[4096];
 616                for (;;)
 617                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 618                                break;
 619        }
 620
 621        close(client.out);
 622        client.out = -1;
 623
 624        err |= finish_command(&client);
 625        free(rpc->service_url);
 626        free(rpc->hdr_content_type);
 627        free(rpc->hdr_accept);
 628        free(rpc->buf);
 629        strbuf_release(&buf);
 630        return err;
 631}
 632
 633static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 634{
 635        struct walker *walker;
 636        char **targets = xmalloc(nr_heads * sizeof(char*));
 637        int ret, i;
 638
 639        if (options.depth)
 640                die("dumb http transport does not support --depth");
 641        for (i = 0; i < nr_heads; i++)
 642                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 643
 644        walker = get_http_walker(url);
 645        walker->get_all = 1;
 646        walker->get_tree = 1;
 647        walker->get_history = 1;
 648        walker->get_verbosely = options.verbosity >= 3;
 649        walker->get_recover = 0;
 650        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 651        walker_free(walker);
 652
 653        for (i = 0; i < nr_heads; i++)
 654                free(targets[i]);
 655        free(targets);
 656
 657        return ret ? error("Fetch failed.") : 0;
 658}
 659
 660static int fetch_git(struct discovery *heads,
 661        int nr_heads, struct ref **to_fetch)
 662{
 663        struct rpc_state rpc;
 664        struct strbuf preamble = STRBUF_INIT;
 665        char *depth_arg = NULL;
 666        int argc = 0, i, err;
 667        const char *argv[15];
 668
 669        argv[argc++] = "fetch-pack";
 670        argv[argc++] = "--stateless-rpc";
 671        argv[argc++] = "--stdin";
 672        argv[argc++] = "--lock-pack";
 673        if (options.followtags)
 674                argv[argc++] = "--include-tag";
 675        if (options.thin)
 676                argv[argc++] = "--thin";
 677        if (options.verbosity >= 3) {
 678                argv[argc++] = "-v";
 679                argv[argc++] = "-v";
 680        }
 681        if (!options.progress)
 682                argv[argc++] = "--no-progress";
 683        if (options.depth) {
 684                struct strbuf buf = STRBUF_INIT;
 685                strbuf_addf(&buf, "--depth=%lu", options.depth);
 686                depth_arg = strbuf_detach(&buf, NULL);
 687                argv[argc++] = depth_arg;
 688        }
 689        argv[argc++] = url;
 690        argv[argc++] = NULL;
 691
 692        for (i = 0; i < nr_heads; i++) {
 693                struct ref *ref = to_fetch[i];
 694                if (!ref->name || !*ref->name)
 695                        die("cannot fetch by sha1 over smart http");
 696                packet_buf_write(&preamble, "%s\n", ref->name);
 697        }
 698        packet_buf_flush(&preamble);
 699
 700        memset(&rpc, 0, sizeof(rpc));
 701        rpc.service_name = "git-upload-pack",
 702        rpc.argv = argv;
 703        rpc.stdin_preamble = &preamble;
 704        rpc.gzip_request = 1;
 705
 706        err = rpc_service(&rpc, heads);
 707        if (rpc.result.len)
 708                write_or_die(1, rpc.result.buf, rpc.result.len);
 709        strbuf_release(&rpc.result);
 710        strbuf_release(&preamble);
 711        free(depth_arg);
 712        return err;
 713}
 714
 715static int fetch(int nr_heads, struct ref **to_fetch)
 716{
 717        struct discovery *d = discover_refs("git-upload-pack", 0);
 718        if (d->proto_git)
 719                return fetch_git(d, nr_heads, to_fetch);
 720        else
 721                return fetch_dumb(nr_heads, to_fetch);
 722}
 723
 724static void parse_fetch(struct strbuf *buf)
 725{
 726        struct ref **to_fetch = NULL;
 727        struct ref *list_head = NULL;
 728        struct ref **list = &list_head;
 729        int alloc_heads = 0, nr_heads = 0;
 730
 731        do {
 732                if (!prefixcmp(buf->buf, "fetch ")) {
 733                        char *p = buf->buf + strlen("fetch ");
 734                        char *name;
 735                        struct ref *ref;
 736                        unsigned char old_sha1[20];
 737
 738                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 739                                die("protocol error: expected sha/ref, got %s'", p);
 740                        if (p[40] == ' ')
 741                                name = p + 41;
 742                        else if (!p[40])
 743                                name = "";
 744                        else
 745                                die("protocol error: expected sha/ref, got %s'", p);
 746
 747                        ref = alloc_ref(name);
 748                        hashcpy(ref->old_sha1, old_sha1);
 749
 750                        *list = ref;
 751                        list = &ref->next;
 752
 753                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 754                        to_fetch[nr_heads++] = ref;
 755                }
 756                else
 757                        die("http transport does not support %s", buf->buf);
 758
 759                strbuf_reset(buf);
 760                if (strbuf_getline(buf, stdin, '\n') == EOF)
 761                        return;
 762                if (!*buf->buf)
 763                        break;
 764        } while (1);
 765
 766        if (fetch(nr_heads, to_fetch))
 767                exit(128); /* error already reported */
 768        free_refs(list_head);
 769        free(to_fetch);
 770
 771        printf("\n");
 772        fflush(stdout);
 773        strbuf_reset(buf);
 774}
 775
 776static int push_dav(int nr_spec, char **specs)
 777{
 778        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 779        int argc = 0, i;
 780
 781        argv[argc++] = "http-push";
 782        argv[argc++] = "--helper-status";
 783        if (options.dry_run)
 784                argv[argc++] = "--dry-run";
 785        if (options.verbosity > 1)
 786                argv[argc++] = "--verbose";
 787        argv[argc++] = url;
 788        for (i = 0; i < nr_spec; i++)
 789                argv[argc++] = specs[i];
 790        argv[argc++] = NULL;
 791
 792        if (run_command_v_opt(argv, RUN_GIT_CMD))
 793                die("git-%s failed", argv[0]);
 794        free(argv);
 795        return 0;
 796}
 797
 798static int push_git(struct discovery *heads, int nr_spec, char **specs)
 799{
 800        struct rpc_state rpc;
 801        int i, err;
 802        struct argv_array args;
 803
 804        argv_array_init(&args);
 805        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 806                         NULL);
 807
 808        if (options.thin)
 809                argv_array_push(&args, "--thin");
 810        if (options.dry_run)
 811                argv_array_push(&args, "--dry-run");
 812        if (options.verbosity == 0)
 813                argv_array_push(&args, "--quiet");
 814        else if (options.verbosity > 1)
 815                argv_array_push(&args, "--verbose");
 816        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 817        argv_array_push(&args, url);
 818        for (i = 0; i < nr_spec; i++)
 819                argv_array_push(&args, specs[i]);
 820
 821        memset(&rpc, 0, sizeof(rpc));
 822        rpc.service_name = "git-receive-pack",
 823        rpc.argv = args.argv;
 824
 825        err = rpc_service(&rpc, heads);
 826        if (rpc.result.len)
 827                write_or_die(1, rpc.result.buf, rpc.result.len);
 828        strbuf_release(&rpc.result);
 829        argv_array_clear(&args);
 830        return err;
 831}
 832
 833static int push(int nr_spec, char **specs)
 834{
 835        struct discovery *heads = discover_refs("git-receive-pack", 1);
 836        int ret;
 837
 838        if (heads->proto_git)
 839                ret = push_git(heads, nr_spec, specs);
 840        else
 841                ret = push_dav(nr_spec, specs);
 842        free_discovery(heads);
 843        return ret;
 844}
 845
 846static void parse_push(struct strbuf *buf)
 847{
 848        char **specs = NULL;
 849        int alloc_spec = 0, nr_spec = 0, i, ret;
 850
 851        do {
 852                if (!prefixcmp(buf->buf, "push ")) {
 853                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 854                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 855                }
 856                else
 857                        die("http transport does not support %s", buf->buf);
 858
 859                strbuf_reset(buf);
 860                if (strbuf_getline(buf, stdin, '\n') == EOF)
 861                        goto free_specs;
 862                if (!*buf->buf)
 863                        break;
 864        } while (1);
 865
 866        ret = push(nr_spec, specs);
 867        printf("\n");
 868        fflush(stdout);
 869
 870        if (ret)
 871                exit(128); /* error already reported */
 872
 873 free_specs:
 874        for (i = 0; i < nr_spec; i++)
 875                free(specs[i]);
 876        free(specs);
 877}
 878
 879int main(int argc, const char **argv)
 880{
 881        struct strbuf buf = STRBUF_INIT;
 882        int nongit;
 883
 884        git_extract_argv0_path(argv[0]);
 885        setup_git_directory_gently(&nongit);
 886        if (argc < 2) {
 887                fprintf(stderr, "Remote needed\n");
 888                return 1;
 889        }
 890
 891        options.verbosity = 1;
 892        options.progress = !!isatty(2);
 893        options.thin = 1;
 894
 895        remote = remote_get(argv[1]);
 896
 897        if (argc > 2) {
 898                end_url_with_slash(&buf, argv[2]);
 899        } else {
 900                end_url_with_slash(&buf, remote->url[0]);
 901        }
 902
 903        url = strbuf_detach(&buf, NULL);
 904
 905        http_init(remote, url, 0);
 906
 907        do {
 908                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 909                        if (ferror(stdin))
 910                                fprintf(stderr, "Error reading command stream\n");
 911                        else
 912                                fprintf(stderr, "Unexpected end of command stream\n");
 913                        return 1;
 914                }
 915                if (buf.len == 0)
 916                        break;
 917                if (!prefixcmp(buf.buf, "fetch ")) {
 918                        if (nongit)
 919                                die("Fetch attempted without a local repo");
 920                        parse_fetch(&buf);
 921
 922                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 923                        int for_push = !!strstr(buf.buf + 4, "for-push");
 924                        output_refs(get_refs(for_push));
 925
 926                } else if (!prefixcmp(buf.buf, "push ")) {
 927                        parse_push(&buf);
 928
 929                } else if (!prefixcmp(buf.buf, "option ")) {
 930                        char *name = buf.buf + strlen("option ");
 931                        char *value = strchr(name, ' ');
 932                        int result;
 933
 934                        if (value)
 935                                *value++ = '\0';
 936                        else
 937                                value = "true";
 938
 939                        result = set_option(name, value);
 940                        if (!result)
 941                                printf("ok\n");
 942                        else if (result < 0)
 943                                printf("error invalid value\n");
 944                        else
 945                                printf("unsupported\n");
 946                        fflush(stdout);
 947
 948                } else if (!strcmp(buf.buf, "capabilities")) {
 949                        printf("fetch\n");
 950                        printf("option\n");
 951                        printf("push\n");
 952                        printf("\n");
 953                        fflush(stdout);
 954                } else {
 955                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 956                        return 1;
 957                }
 958                strbuf_reset(&buf);
 959        } while (1);
 960
 961        http_cleanup();
 962
 963        return 0;
 964}