Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit remote-curl: store url as a strbuf (b227bbc)
   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;
  14/* always ends with a trailing slash */
  15static struct strbuf url = STRBUF_INIT;
  16
  17struct options {
  18        int verbosity;
  19        unsigned long depth;
  20        unsigned progress : 1,
  21                followtags : 1,
  22                dry_run : 1,
  23                thin : 1;
  24};
  25static struct options options;
  26
  27static int set_option(const char *name, const char *value)
  28{
  29        if (!strcmp(name, "verbosity")) {
  30                char *end;
  31                int v = strtol(value, &end, 10);
  32                if (value == end || *end)
  33                        return -1;
  34                options.verbosity = v;
  35                return 0;
  36        }
  37        else if (!strcmp(name, "progress")) {
  38                if (!strcmp(value, "true"))
  39                        options.progress = 1;
  40                else if (!strcmp(value, "false"))
  41                        options.progress = 0;
  42                else
  43                        return -1;
  44                return 0;
  45        }
  46        else if (!strcmp(name, "depth")) {
  47                char *end;
  48                unsigned long v = strtoul(value, &end, 10);
  49                if (value == end || *end)
  50                        return -1;
  51                options.depth = v;
  52                return 0;
  53        }
  54        else if (!strcmp(name, "followtags")) {
  55                if (!strcmp(value, "true"))
  56                        options.followtags = 1;
  57                else if (!strcmp(value, "false"))
  58                        options.followtags = 0;
  59                else
  60                        return -1;
  61                return 0;
  62        }
  63        else if (!strcmp(name, "dry-run")) {
  64                if (!strcmp(value, "true"))
  65                        options.dry_run = 1;
  66                else if (!strcmp(value, "false"))
  67                        options.dry_run = 0;
  68                else
  69                        return -1;
  70                return 0;
  71        }
  72        else {
  73                return 1 /* unsupported */;
  74        }
  75}
  76
  77struct discovery {
  78        const char *service;
  79        char *buf_alloc;
  80        char *buf;
  81        size_t len;
  82        struct ref *refs;
  83        unsigned proto_git : 1;
  84};
  85static struct discovery *last_discovery;
  86
  87static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  88{
  89        struct ref *list = NULL;
  90        get_remote_heads(-1, heads->buf, heads->len, &list,
  91                         for_push ? REF_NORMAL : 0, NULL);
  92        return list;
  93}
  94
  95static struct ref *parse_info_refs(struct discovery *heads)
  96{
  97        char *data, *start, *mid;
  98        char *ref_name;
  99        int i = 0;
 100
 101        struct ref *refs = NULL;
 102        struct ref *ref = NULL;
 103        struct ref *last_ref = NULL;
 104
 105        data = heads->buf;
 106        start = NULL;
 107        mid = data;
 108        while (i < heads->len) {
 109                if (!start) {
 110                        start = &data[i];
 111                }
 112                if (data[i] == '\t')
 113                        mid = &data[i];
 114                if (data[i] == '\n') {
 115                        if (mid - start != 40)
 116                                die("%sinfo/refs not valid: is this a git repository?",
 117                                    url.buf);
 118                        data[i] = 0;
 119                        ref_name = mid + 1;
 120                        ref = xmalloc(sizeof(struct ref) +
 121                                      strlen(ref_name) + 1);
 122                        memset(ref, 0, sizeof(struct ref));
 123                        strcpy(ref->name, ref_name);
 124                        get_sha1_hex(start, ref->old_sha1);
 125                        if (!refs)
 126                                refs = ref;
 127                        if (last_ref)
 128                                last_ref->next = ref;
 129                        last_ref = ref;
 130                        start = NULL;
 131                }
 132                i++;
 133        }
 134
 135        ref = alloc_ref("HEAD");
 136        if (!http_fetch_ref(url.buf, ref) &&
 137            !resolve_remote_symref(ref, refs)) {
 138                ref->next = refs;
 139                refs = ref;
 140        } else {
 141                free(ref);
 142        }
 143
 144        return refs;
 145}
 146
 147static void free_discovery(struct discovery *d)
 148{
 149        if (d) {
 150                if (d == last_discovery)
 151                        last_discovery = NULL;
 152                free(d->buf_alloc);
 153                free_refs(d->refs);
 154                free(d);
 155        }
 156}
 157
 158static int show_http_message(struct strbuf *type, struct strbuf *msg)
 159{
 160        const char *p, *eol;
 161
 162        /*
 163         * We only show text/plain parts, as other types are likely
 164         * to be ugly to look at on the user's terminal.
 165         *
 166         * TODO should handle "; charset=XXX", and re-encode into
 167         * logoutputencoding
 168         */
 169        if (strcasecmp(type->buf, "text/plain"))
 170                return -1;
 171
 172        strbuf_trim(msg);
 173        if (!msg->len)
 174                return -1;
 175
 176        p = msg->buf;
 177        do {
 178                eol = strchrnul(p, '\n');
 179                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 180                p = eol + 1;
 181        } while(*eol);
 182        return 0;
 183}
 184
 185static struct discovery* discover_refs(const char *service, int for_push)
 186{
 187        struct strbuf exp = STRBUF_INIT;
 188        struct strbuf type = STRBUF_INIT;
 189        struct strbuf buffer = STRBUF_INIT;
 190        struct strbuf refs_url = STRBUF_INIT;
 191        struct discovery *last = last_discovery;
 192        int http_ret, maybe_smart = 0;
 193        struct http_get_options options;
 194
 195        if (last && !strcmp(service, last->service))
 196                return last;
 197        free_discovery(last);
 198
 199        strbuf_addf(&refs_url, "%sinfo/refs", url.buf);
 200        if ((!prefixcmp(url.buf, "http://") || !prefixcmp(url.buf, "https://")) &&
 201             git_env_bool("GIT_SMART_HTTP", 1)) {
 202                maybe_smart = 1;
 203                if (!strchr(url.buf, '?'))
 204                        strbuf_addch(&refs_url, '?');
 205                else
 206                        strbuf_addch(&refs_url, '&');
 207                strbuf_addf(&refs_url, "service=%s", service);
 208        }
 209
 210        memset(&options, 0, sizeof(options));
 211        options.content_type = &type;
 212        options.no_cache = 1;
 213        options.keep_error = 1;
 214
 215        http_ret = http_get_strbuf(refs_url.buf, &buffer, &options);
 216        switch (http_ret) {
 217        case HTTP_OK:
 218                break;
 219        case HTTP_MISSING_TARGET:
 220                show_http_message(&type, &buffer);
 221                die("repository '%s' not found", url.buf);
 222        case HTTP_NOAUTH:
 223                show_http_message(&type, &buffer);
 224                die("Authentication failed for '%s'", url.buf);
 225        default:
 226                show_http_message(&type, &buffer);
 227                die("unable to access '%s': %s", url.buf, curl_errorstr);
 228        }
 229
 230        last= xcalloc(1, sizeof(*last_discovery));
 231        last->service = service;
 232        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 233        last->buf = last->buf_alloc;
 234
 235        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 236        if (maybe_smart &&
 237            (5 <= last->len && last->buf[4] == '#') &&
 238            !strbuf_cmp(&exp, &type)) {
 239                char *line;
 240
 241                /*
 242                 * smart HTTP response; validate that the service
 243                 * pkt-line matches our request.
 244                 */
 245                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 246
 247                strbuf_reset(&exp);
 248                strbuf_addf(&exp, "# service=%s", service);
 249                if (strcmp(line, exp.buf))
 250                        die("invalid server response; got '%s'", line);
 251                strbuf_release(&exp);
 252
 253                /* The header can include additional metadata lines, up
 254                 * until a packet flush marker.  Ignore these now, but
 255                 * in the future we might start to scan them.
 256                 */
 257                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 258                        ;
 259
 260                last->proto_git = 1;
 261        }
 262
 263        if (last->proto_git)
 264                last->refs = parse_git_refs(last, for_push);
 265        else
 266                last->refs = parse_info_refs(last);
 267
 268        strbuf_release(&refs_url);
 269        strbuf_release(&exp);
 270        strbuf_release(&type);
 271        strbuf_release(&buffer);
 272        last_discovery = last;
 273        return last;
 274}
 275
 276static struct ref *get_refs(int for_push)
 277{
 278        struct discovery *heads;
 279
 280        if (for_push)
 281                heads = discover_refs("git-receive-pack", for_push);
 282        else
 283                heads = discover_refs("git-upload-pack", for_push);
 284
 285        return heads->refs;
 286}
 287
 288static void output_refs(struct ref *refs)
 289{
 290        struct ref *posn;
 291        for (posn = refs; posn; posn = posn->next) {
 292                if (posn->symref)
 293                        printf("@%s %s\n", posn->symref, posn->name);
 294                else
 295                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 296        }
 297        printf("\n");
 298        fflush(stdout);
 299}
 300
 301struct rpc_state {
 302        const char *service_name;
 303        const char **argv;
 304        struct strbuf *stdin_preamble;
 305        char *service_url;
 306        char *hdr_content_type;
 307        char *hdr_accept;
 308        char *buf;
 309        size_t alloc;
 310        size_t len;
 311        size_t pos;
 312        int in;
 313        int out;
 314        struct strbuf result;
 315        unsigned gzip_request : 1;
 316        unsigned initial_buffer : 1;
 317};
 318
 319static size_t rpc_out(void *ptr, size_t eltsize,
 320                size_t nmemb, void *buffer_)
 321{
 322        size_t max = eltsize * nmemb;
 323        struct rpc_state *rpc = buffer_;
 324        size_t avail = rpc->len - rpc->pos;
 325
 326        if (!avail) {
 327                rpc->initial_buffer = 0;
 328                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 329                if (!avail)
 330                        return 0;
 331                rpc->pos = 0;
 332                rpc->len = avail;
 333        }
 334
 335        if (max < avail)
 336                avail = max;
 337        memcpy(ptr, rpc->buf + rpc->pos, avail);
 338        rpc->pos += avail;
 339        return avail;
 340}
 341
 342#ifndef NO_CURL_IOCTL
 343static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 344{
 345        struct rpc_state *rpc = clientp;
 346
 347        switch (cmd) {
 348        case CURLIOCMD_NOP:
 349                return CURLIOE_OK;
 350
 351        case CURLIOCMD_RESTARTREAD:
 352                if (rpc->initial_buffer) {
 353                        rpc->pos = 0;
 354                        return CURLIOE_OK;
 355                }
 356                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 357                return CURLIOE_FAILRESTART;
 358
 359        default:
 360                return CURLIOE_UNKNOWNCMD;
 361        }
 362}
 363#endif
 364
 365static size_t rpc_in(char *ptr, size_t eltsize,
 366                size_t nmemb, void *buffer_)
 367{
 368        size_t size = eltsize * nmemb;
 369        struct rpc_state *rpc = buffer_;
 370        write_or_die(rpc->in, ptr, size);
 371        return size;
 372}
 373
 374static int run_slot(struct active_request_slot *slot)
 375{
 376        int err;
 377        struct slot_results results;
 378
 379        slot->results = &results;
 380        slot->curl_result = curl_easy_perform(slot->curl);
 381        finish_active_slot(slot);
 382
 383        err = handle_curl_result(&results);
 384        if (err != HTTP_OK && err != HTTP_REAUTH) {
 385                error("RPC failed; result=%d, HTTP code = %ld",
 386                      results.curl_result, results.http_code);
 387        }
 388
 389        return err;
 390}
 391
 392static int probe_rpc(struct rpc_state *rpc)
 393{
 394        struct active_request_slot *slot;
 395        struct curl_slist *headers = NULL;
 396        struct strbuf buf = STRBUF_INIT;
 397        int err;
 398
 399        slot = get_active_slot();
 400
 401        headers = curl_slist_append(headers, rpc->hdr_content_type);
 402        headers = curl_slist_append(headers, rpc->hdr_accept);
 403
 404        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 405        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 406        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 407        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 408        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 409        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 410        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 411        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 412        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 413
 414        err = run_slot(slot);
 415
 416        curl_slist_free_all(headers);
 417        strbuf_release(&buf);
 418        return err;
 419}
 420
 421static int post_rpc(struct rpc_state *rpc)
 422{
 423        struct active_request_slot *slot;
 424        struct curl_slist *headers = NULL;
 425        int use_gzip = rpc->gzip_request;
 426        char *gzip_body = NULL;
 427        size_t gzip_size = 0;
 428        int err, large_request = 0;
 429
 430        /* Try to load the entire request, if we can fit it into the
 431         * allocated buffer space we can use HTTP/1.0 and avoid the
 432         * chunked encoding mess.
 433         */
 434        while (1) {
 435                size_t left = rpc->alloc - rpc->len;
 436                char *buf = rpc->buf + rpc->len;
 437                int n;
 438
 439                if (left < LARGE_PACKET_MAX) {
 440                        large_request = 1;
 441                        use_gzip = 0;
 442                        break;
 443                }
 444
 445                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 446                if (!n)
 447                        break;
 448                rpc->len += n;
 449        }
 450
 451        if (large_request) {
 452                do {
 453                        err = probe_rpc(rpc);
 454                        if (err == HTTP_REAUTH)
 455                                credential_fill(&http_auth);
 456                } while (err == HTTP_REAUTH);
 457                if (err != HTTP_OK)
 458                        return -1;
 459        }
 460
 461        headers = curl_slist_append(headers, rpc->hdr_content_type);
 462        headers = curl_slist_append(headers, rpc->hdr_accept);
 463        headers = curl_slist_append(headers, "Expect:");
 464
 465retry:
 466        slot = get_active_slot();
 467
 468        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 469        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 470        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 471        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 472
 473        if (large_request) {
 474                /* The request body is large and the size cannot be predicted.
 475                 * We must use chunked encoding to send it.
 476                 */
 477                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 478                rpc->initial_buffer = 1;
 479                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 480                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 481#ifndef NO_CURL_IOCTL
 482                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 483                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 484#endif
 485                if (options.verbosity > 1) {
 486                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 487                        fflush(stderr);
 488                }
 489
 490        } else if (gzip_body) {
 491                /*
 492                 * If we are looping to retry authentication, then the previous
 493                 * run will have set up the headers and gzip buffer already,
 494                 * and we just need to send it.
 495                 */
 496                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 497                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 498
 499        } else if (use_gzip && 1024 < rpc->len) {
 500                /* The client backend isn't giving us compressed data so
 501                 * we can try to deflate it ourselves, this may save on.
 502                 * the transfer time.
 503                 */
 504                git_zstream stream;
 505                int ret;
 506
 507                memset(&stream, 0, sizeof(stream));
 508                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 509                gzip_size = git_deflate_bound(&stream, rpc->len);
 510                gzip_body = xmalloc(gzip_size);
 511
 512                stream.next_in = (unsigned char *)rpc->buf;
 513                stream.avail_in = rpc->len;
 514                stream.next_out = (unsigned char *)gzip_body;
 515                stream.avail_out = gzip_size;
 516
 517                ret = git_deflate(&stream, Z_FINISH);
 518                if (ret != Z_STREAM_END)
 519                        die("cannot deflate request; zlib deflate error %d", ret);
 520
 521                ret = git_deflate_end_gently(&stream);
 522                if (ret != Z_OK)
 523                        die("cannot deflate request; zlib end error %d", ret);
 524
 525                gzip_size = stream.total_out;
 526
 527                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 528                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 529                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 530
 531                if (options.verbosity > 1) {
 532                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 533                                rpc->service_name,
 534                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 535                        fflush(stderr);
 536                }
 537        } else {
 538                /* We know the complete request size in advance, use the
 539                 * more normal Content-Length approach.
 540                 */
 541                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 542                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 543                if (options.verbosity > 1) {
 544                        fprintf(stderr, "POST %s (%lu bytes)\n",
 545                                rpc->service_name, (unsigned long)rpc->len);
 546                        fflush(stderr);
 547                }
 548        }
 549
 550        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 551        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 552        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 553
 554        err = run_slot(slot);
 555        if (err == HTTP_REAUTH && !large_request) {
 556                credential_fill(&http_auth);
 557                goto retry;
 558        }
 559        if (err != HTTP_OK)
 560                err = -1;
 561
 562        curl_slist_free_all(headers);
 563        free(gzip_body);
 564        return err;
 565}
 566
 567static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 568{
 569        const char *svc = rpc->service_name;
 570        struct strbuf buf = STRBUF_INIT;
 571        struct strbuf *preamble = rpc->stdin_preamble;
 572        struct child_process client;
 573        int err = 0;
 574
 575        memset(&client, 0, sizeof(client));
 576        client.in = -1;
 577        client.out = -1;
 578        client.git_cmd = 1;
 579        client.argv = rpc->argv;
 580        if (start_command(&client))
 581                exit(1);
 582        if (preamble)
 583                write_or_die(client.in, preamble->buf, preamble->len);
 584        if (heads)
 585                write_or_die(client.in, heads->buf, heads->len);
 586
 587        rpc->alloc = http_post_buffer;
 588        rpc->buf = xmalloc(rpc->alloc);
 589        rpc->in = client.in;
 590        rpc->out = client.out;
 591        strbuf_init(&rpc->result, 0);
 592
 593        strbuf_addf(&buf, "%s%s", url.buf, svc);
 594        rpc->service_url = strbuf_detach(&buf, NULL);
 595
 596        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 597        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 598
 599        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 600        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 601
 602        while (!err) {
 603                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 604                if (!n)
 605                        break;
 606                rpc->pos = 0;
 607                rpc->len = n;
 608                err |= post_rpc(rpc);
 609        }
 610
 611        close(client.in);
 612        client.in = -1;
 613        if (!err) {
 614                strbuf_read(&rpc->result, client.out, 0);
 615        } else {
 616                char buf[4096];
 617                for (;;)
 618                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 619                                break;
 620        }
 621
 622        close(client.out);
 623        client.out = -1;
 624
 625        err |= finish_command(&client);
 626        free(rpc->service_url);
 627        free(rpc->hdr_content_type);
 628        free(rpc->hdr_accept);
 629        free(rpc->buf);
 630        strbuf_release(&buf);
 631        return err;
 632}
 633
 634static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 635{
 636        struct walker *walker;
 637        char **targets = xmalloc(nr_heads * sizeof(char*));
 638        int ret, i;
 639
 640        if (options.depth)
 641                die("dumb http transport does not support --depth");
 642        for (i = 0; i < nr_heads; i++)
 643                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 644
 645        walker = get_http_walker(url.buf);
 646        walker->get_all = 1;
 647        walker->get_tree = 1;
 648        walker->get_history = 1;
 649        walker->get_verbosely = options.verbosity >= 3;
 650        walker->get_recover = 0;
 651        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 652        walker_free(walker);
 653
 654        for (i = 0; i < nr_heads; i++)
 655                free(targets[i]);
 656        free(targets);
 657
 658        return ret ? error("Fetch failed.") : 0;
 659}
 660
 661static int fetch_git(struct discovery *heads,
 662        int nr_heads, struct ref **to_fetch)
 663{
 664        struct rpc_state rpc;
 665        struct strbuf preamble = STRBUF_INIT;
 666        char *depth_arg = NULL;
 667        int argc = 0, i, err;
 668        const char *argv[15];
 669
 670        argv[argc++] = "fetch-pack";
 671        argv[argc++] = "--stateless-rpc";
 672        argv[argc++] = "--stdin";
 673        argv[argc++] = "--lock-pack";
 674        if (options.followtags)
 675                argv[argc++] = "--include-tag";
 676        if (options.thin)
 677                argv[argc++] = "--thin";
 678        if (options.verbosity >= 3) {
 679                argv[argc++] = "-v";
 680                argv[argc++] = "-v";
 681        }
 682        if (!options.progress)
 683                argv[argc++] = "--no-progress";
 684        if (options.depth) {
 685                struct strbuf buf = STRBUF_INIT;
 686                strbuf_addf(&buf, "--depth=%lu", options.depth);
 687                depth_arg = strbuf_detach(&buf, NULL);
 688                argv[argc++] = depth_arg;
 689        }
 690        argv[argc++] = url.buf;
 691        argv[argc++] = NULL;
 692
 693        for (i = 0; i < nr_heads; i++) {
 694                struct ref *ref = to_fetch[i];
 695                if (!ref->name || !*ref->name)
 696                        die("cannot fetch by sha1 over smart http");
 697                packet_buf_write(&preamble, "%s\n", ref->name);
 698        }
 699        packet_buf_flush(&preamble);
 700
 701        memset(&rpc, 0, sizeof(rpc));
 702        rpc.service_name = "git-upload-pack",
 703        rpc.argv = argv;
 704        rpc.stdin_preamble = &preamble;
 705        rpc.gzip_request = 1;
 706
 707        err = rpc_service(&rpc, heads);
 708        if (rpc.result.len)
 709                write_or_die(1, rpc.result.buf, rpc.result.len);
 710        strbuf_release(&rpc.result);
 711        strbuf_release(&preamble);
 712        free(depth_arg);
 713        return err;
 714}
 715
 716static int fetch(int nr_heads, struct ref **to_fetch)
 717{
 718        struct discovery *d = discover_refs("git-upload-pack", 0);
 719        if (d->proto_git)
 720                return fetch_git(d, nr_heads, to_fetch);
 721        else
 722                return fetch_dumb(nr_heads, to_fetch);
 723}
 724
 725static void parse_fetch(struct strbuf *buf)
 726{
 727        struct ref **to_fetch = NULL;
 728        struct ref *list_head = NULL;
 729        struct ref **list = &list_head;
 730        int alloc_heads = 0, nr_heads = 0;
 731
 732        do {
 733                if (!prefixcmp(buf->buf, "fetch ")) {
 734                        char *p = buf->buf + strlen("fetch ");
 735                        char *name;
 736                        struct ref *ref;
 737                        unsigned char old_sha1[20];
 738
 739                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 740                                die("protocol error: expected sha/ref, got %s'", p);
 741                        if (p[40] == ' ')
 742                                name = p + 41;
 743                        else if (!p[40])
 744                                name = "";
 745                        else
 746                                die("protocol error: expected sha/ref, got %s'", p);
 747
 748                        ref = alloc_ref(name);
 749                        hashcpy(ref->old_sha1, old_sha1);
 750
 751                        *list = ref;
 752                        list = &ref->next;
 753
 754                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 755                        to_fetch[nr_heads++] = ref;
 756                }
 757                else
 758                        die("http transport does not support %s", buf->buf);
 759
 760                strbuf_reset(buf);
 761                if (strbuf_getline(buf, stdin, '\n') == EOF)
 762                        return;
 763                if (!*buf->buf)
 764                        break;
 765        } while (1);
 766
 767        if (fetch(nr_heads, to_fetch))
 768                exit(128); /* error already reported */
 769        free_refs(list_head);
 770        free(to_fetch);
 771
 772        printf("\n");
 773        fflush(stdout);
 774        strbuf_reset(buf);
 775}
 776
 777static int push_dav(int nr_spec, char **specs)
 778{
 779        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 780        int argc = 0, i;
 781
 782        argv[argc++] = "http-push";
 783        argv[argc++] = "--helper-status";
 784        if (options.dry_run)
 785                argv[argc++] = "--dry-run";
 786        if (options.verbosity > 1)
 787                argv[argc++] = "--verbose";
 788        argv[argc++] = url.buf;
 789        for (i = 0; i < nr_spec; i++)
 790                argv[argc++] = specs[i];
 791        argv[argc++] = NULL;
 792
 793        if (run_command_v_opt(argv, RUN_GIT_CMD))
 794                die("git-%s failed", argv[0]);
 795        free(argv);
 796        return 0;
 797}
 798
 799static int push_git(struct discovery *heads, int nr_spec, char **specs)
 800{
 801        struct rpc_state rpc;
 802        int i, err;
 803        struct argv_array args;
 804
 805        argv_array_init(&args);
 806        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 807                         NULL);
 808
 809        if (options.thin)
 810                argv_array_push(&args, "--thin");
 811        if (options.dry_run)
 812                argv_array_push(&args, "--dry-run");
 813        if (options.verbosity == 0)
 814                argv_array_push(&args, "--quiet");
 815        else if (options.verbosity > 1)
 816                argv_array_push(&args, "--verbose");
 817        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 818        argv_array_push(&args, url.buf);
 819        for (i = 0; i < nr_spec; i++)
 820                argv_array_push(&args, specs[i]);
 821
 822        memset(&rpc, 0, sizeof(rpc));
 823        rpc.service_name = "git-receive-pack",
 824        rpc.argv = args.argv;
 825
 826        err = rpc_service(&rpc, heads);
 827        if (rpc.result.len)
 828                write_or_die(1, rpc.result.buf, rpc.result.len);
 829        strbuf_release(&rpc.result);
 830        argv_array_clear(&args);
 831        return err;
 832}
 833
 834static int push(int nr_spec, char **specs)
 835{
 836        struct discovery *heads = discover_refs("git-receive-pack", 1);
 837        int ret;
 838
 839        if (heads->proto_git)
 840                ret = push_git(heads, nr_spec, specs);
 841        else
 842                ret = push_dav(nr_spec, specs);
 843        free_discovery(heads);
 844        return ret;
 845}
 846
 847static void parse_push(struct strbuf *buf)
 848{
 849        char **specs = NULL;
 850        int alloc_spec = 0, nr_spec = 0, i, ret;
 851
 852        do {
 853                if (!prefixcmp(buf->buf, "push ")) {
 854                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 855                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 856                }
 857                else
 858                        die("http transport does not support %s", buf->buf);
 859
 860                strbuf_reset(buf);
 861                if (strbuf_getline(buf, stdin, '\n') == EOF)
 862                        goto free_specs;
 863                if (!*buf->buf)
 864                        break;
 865        } while (1);
 866
 867        ret = push(nr_spec, specs);
 868        printf("\n");
 869        fflush(stdout);
 870
 871        if (ret)
 872                exit(128); /* error already reported */
 873
 874 free_specs:
 875        for (i = 0; i < nr_spec; i++)
 876                free(specs[i]);
 877        free(specs);
 878}
 879
 880int main(int argc, const char **argv)
 881{
 882        struct strbuf buf = STRBUF_INIT;
 883        int nongit;
 884
 885        git_extract_argv0_path(argv[0]);
 886        setup_git_directory_gently(&nongit);
 887        if (argc < 2) {
 888                fprintf(stderr, "Remote needed\n");
 889                return 1;
 890        }
 891
 892        options.verbosity = 1;
 893        options.progress = !!isatty(2);
 894        options.thin = 1;
 895
 896        remote = remote_get(argv[1]);
 897
 898        if (argc > 2) {
 899                end_url_with_slash(&url, argv[2]);
 900        } else {
 901                end_url_with_slash(&url, remote->url[0]);
 902        }
 903
 904        http_init(remote, url.buf, 0);
 905
 906        do {
 907                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 908                        if (ferror(stdin))
 909                                fprintf(stderr, "Error reading command stream\n");
 910                        else
 911                                fprintf(stderr, "Unexpected end of command stream\n");
 912                        return 1;
 913                }
 914                if (buf.len == 0)
 915                        break;
 916                if (!prefixcmp(buf.buf, "fetch ")) {
 917                        if (nongit)
 918                                die("Fetch attempted without a local repo");
 919                        parse_fetch(&buf);
 920
 921                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 922                        int for_push = !!strstr(buf.buf + 4, "for-push");
 923                        output_refs(get_refs(for_push));
 924
 925                } else if (!prefixcmp(buf.buf, "push ")) {
 926                        parse_push(&buf);
 927
 928                } else if (!prefixcmp(buf.buf, "option ")) {
 929                        char *name = buf.buf + strlen("option ");
 930                        char *value = strchr(name, ' ');
 931                        int result;
 932
 933                        if (value)
 934                                *value++ = '\0';
 935                        else
 936                                value = "true";
 937
 938                        result = set_option(name, value);
 939                        if (!result)
 940                                printf("ok\n");
 941                        else if (result < 0)
 942                                printf("error invalid value\n");
 943                        else
 944                                printf("unsupported\n");
 945                        fflush(stdout);
 946
 947                } else if (!strcmp(buf.buf, "capabilities")) {
 948                        printf("fetch\n");
 949                        printf("option\n");
 950                        printf("push\n");
 951                        printf("\n");
 952                        fflush(stdout);
 953                } else {
 954                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 955                        return 1;
 956                }
 957                strbuf_reset(&buf);
 958        } while (1);
 959
 960        http_cleanup();
 961
 962        return 0;
 963}