Andrew's git / gitweb.git / remote-curl.c
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remote-curl.con commit http: refactor options to http_get_* (1bbcc22)
   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
  12static struct remote *remote;
  13static const char *url; /* always ends with a trailing slash */
  14
  15struct options {
  16        int verbosity;
  17        unsigned long depth;
  18        unsigned progress : 1,
  19                followtags : 1,
  20                dry_run : 1,
  21                thin : 1;
  22};
  23static struct options options;
  24
  25static int set_option(const char *name, const char *value)
  26{
  27        if (!strcmp(name, "verbosity")) {
  28                char *end;
  29                int v = strtol(value, &end, 10);
  30                if (value == end || *end)
  31                        return -1;
  32                options.verbosity = v;
  33                return 0;
  34        }
  35        else if (!strcmp(name, "progress")) {
  36                if (!strcmp(value, "true"))
  37                        options.progress = 1;
  38                else if (!strcmp(value, "false"))
  39                        options.progress = 0;
  40                else
  41                        return -1;
  42                return 0;
  43        }
  44        else if (!strcmp(name, "depth")) {
  45                char *end;
  46                unsigned long v = strtoul(value, &end, 10);
  47                if (value == end || *end)
  48                        return -1;
  49                options.depth = v;
  50                return 0;
  51        }
  52        else if (!strcmp(name, "followtags")) {
  53                if (!strcmp(value, "true"))
  54                        options.followtags = 1;
  55                else if (!strcmp(value, "false"))
  56                        options.followtags = 0;
  57                else
  58                        return -1;
  59                return 0;
  60        }
  61        else if (!strcmp(name, "dry-run")) {
  62                if (!strcmp(value, "true"))
  63                        options.dry_run = 1;
  64                else if (!strcmp(value, "false"))
  65                        options.dry_run = 0;
  66                else
  67                        return -1;
  68                return 0;
  69        }
  70        else {
  71                return 1 /* unsupported */;
  72        }
  73}
  74
  75struct discovery {
  76        const char *service;
  77        char *buf_alloc;
  78        char *buf;
  79        size_t len;
  80        struct ref *refs;
  81        unsigned proto_git : 1;
  82};
  83static struct discovery *last_discovery;
  84
  85static struct ref *parse_git_refs(struct discovery *heads, int for_push)
  86{
  87        struct ref *list = NULL;
  88        get_remote_heads(-1, heads->buf, heads->len, &list,
  89                         for_push ? REF_NORMAL : 0, NULL);
  90        return list;
  91}
  92
  93static struct ref *parse_info_refs(struct discovery *heads)
  94{
  95        char *data, *start, *mid;
  96        char *ref_name;
  97        int i = 0;
  98
  99        struct ref *refs = NULL;
 100        struct ref *ref = NULL;
 101        struct ref *last_ref = NULL;
 102
 103        data = heads->buf;
 104        start = NULL;
 105        mid = data;
 106        while (i < heads->len) {
 107                if (!start) {
 108                        start = &data[i];
 109                }
 110                if (data[i] == '\t')
 111                        mid = &data[i];
 112                if (data[i] == '\n') {
 113                        if (mid - start != 40)
 114                                die("%sinfo/refs not valid: is this a git repository?", url);
 115                        data[i] = 0;
 116                        ref_name = mid + 1;
 117                        ref = xmalloc(sizeof(struct ref) +
 118                                      strlen(ref_name) + 1);
 119                        memset(ref, 0, sizeof(struct ref));
 120                        strcpy(ref->name, ref_name);
 121                        get_sha1_hex(start, ref->old_sha1);
 122                        if (!refs)
 123                                refs = ref;
 124                        if (last_ref)
 125                                last_ref->next = ref;
 126                        last_ref = ref;
 127                        start = NULL;
 128                }
 129                i++;
 130        }
 131
 132        ref = alloc_ref("HEAD");
 133        if (!http_fetch_ref(url, ref) &&
 134            !resolve_remote_symref(ref, refs)) {
 135                ref->next = refs;
 136                refs = ref;
 137        } else {
 138                free(ref);
 139        }
 140
 141        return refs;
 142}
 143
 144static void free_discovery(struct discovery *d)
 145{
 146        if (d) {
 147                if (d == last_discovery)
 148                        last_discovery = NULL;
 149                free(d->buf_alloc);
 150                free_refs(d->refs);
 151                free(d);
 152        }
 153}
 154
 155static int show_http_message(struct strbuf *type, struct strbuf *msg)
 156{
 157        const char *p, *eol;
 158
 159        /*
 160         * We only show text/plain parts, as other types are likely
 161         * to be ugly to look at on the user's terminal.
 162         *
 163         * TODO should handle "; charset=XXX", and re-encode into
 164         * logoutputencoding
 165         */
 166        if (strcasecmp(type->buf, "text/plain"))
 167                return -1;
 168
 169        strbuf_trim(msg);
 170        if (!msg->len)
 171                return -1;
 172
 173        p = msg->buf;
 174        do {
 175                eol = strchrnul(p, '\n');
 176                fprintf(stderr, "remote: %.*s\n", (int)(eol - p), p);
 177                p = eol + 1;
 178        } while(*eol);
 179        return 0;
 180}
 181
 182static struct discovery* discover_refs(const char *service, int for_push)
 183{
 184        struct strbuf exp = STRBUF_INIT;
 185        struct strbuf type = STRBUF_INIT;
 186        struct strbuf buffer = STRBUF_INIT;
 187        struct discovery *last = last_discovery;
 188        char *refs_url;
 189        int http_ret, maybe_smart = 0;
 190        struct http_get_options options;
 191
 192        if (last && !strcmp(service, last->service))
 193                return last;
 194        free_discovery(last);
 195
 196        strbuf_addf(&buffer, "%sinfo/refs", url);
 197        if ((!prefixcmp(url, "http://") || !prefixcmp(url, "https://")) &&
 198             git_env_bool("GIT_SMART_HTTP", 1)) {
 199                maybe_smart = 1;
 200                if (!strchr(url, '?'))
 201                        strbuf_addch(&buffer, '?');
 202                else
 203                        strbuf_addch(&buffer, '&');
 204                strbuf_addf(&buffer, "service=%s", service);
 205        }
 206        refs_url = strbuf_detach(&buffer, NULL);
 207
 208        memset(&options, 0, sizeof(options));
 209        options.content_type = &type;
 210        options.no_cache = 1;
 211        options.keep_error = 1;
 212
 213        http_ret = http_get_strbuf(refs_url, &buffer, &options);
 214        switch (http_ret) {
 215        case HTTP_OK:
 216                break;
 217        case HTTP_MISSING_TARGET:
 218                show_http_message(&type, &buffer);
 219                die("repository '%s' not found", url);
 220        case HTTP_NOAUTH:
 221                show_http_message(&type, &buffer);
 222                die("Authentication failed for '%s'", url);
 223        default:
 224                show_http_message(&type, &buffer);
 225                die("unable to access '%s': %s", url, curl_errorstr);
 226        }
 227
 228        last= xcalloc(1, sizeof(*last_discovery));
 229        last->service = service;
 230        last->buf_alloc = strbuf_detach(&buffer, &last->len);
 231        last->buf = last->buf_alloc;
 232
 233        strbuf_addf(&exp, "application/x-%s-advertisement", service);
 234        if (maybe_smart &&
 235            (5 <= last->len && last->buf[4] == '#') &&
 236            !strbuf_cmp(&exp, &type)) {
 237                char *line;
 238
 239                /*
 240                 * smart HTTP response; validate that the service
 241                 * pkt-line matches our request.
 242                 */
 243                line = packet_read_line_buf(&last->buf, &last->len, NULL);
 244
 245                strbuf_reset(&exp);
 246                strbuf_addf(&exp, "# service=%s", service);
 247                if (strcmp(line, exp.buf))
 248                        die("invalid server response; got '%s'", line);
 249                strbuf_release(&exp);
 250
 251                /* The header can include additional metadata lines, up
 252                 * until a packet flush marker.  Ignore these now, but
 253                 * in the future we might start to scan them.
 254                 */
 255                while (packet_read_line_buf(&last->buf, &last->len, NULL))
 256                        ;
 257
 258                last->proto_git = 1;
 259        }
 260
 261        if (last->proto_git)
 262                last->refs = parse_git_refs(last, for_push);
 263        else
 264                last->refs = parse_info_refs(last);
 265
 266        free(refs_url);
 267        strbuf_release(&exp);
 268        strbuf_release(&type);
 269        strbuf_release(&buffer);
 270        last_discovery = last;
 271        return last;
 272}
 273
 274static struct ref *get_refs(int for_push)
 275{
 276        struct discovery *heads;
 277
 278        if (for_push)
 279                heads = discover_refs("git-receive-pack", for_push);
 280        else
 281                heads = discover_refs("git-upload-pack", for_push);
 282
 283        return heads->refs;
 284}
 285
 286static void output_refs(struct ref *refs)
 287{
 288        struct ref *posn;
 289        for (posn = refs; posn; posn = posn->next) {
 290                if (posn->symref)
 291                        printf("@%s %s\n", posn->symref, posn->name);
 292                else
 293                        printf("%s %s\n", sha1_to_hex(posn->old_sha1), posn->name);
 294        }
 295        printf("\n");
 296        fflush(stdout);
 297}
 298
 299struct rpc_state {
 300        const char *service_name;
 301        const char **argv;
 302        struct strbuf *stdin_preamble;
 303        char *service_url;
 304        char *hdr_content_type;
 305        char *hdr_accept;
 306        char *buf;
 307        size_t alloc;
 308        size_t len;
 309        size_t pos;
 310        int in;
 311        int out;
 312        struct strbuf result;
 313        unsigned gzip_request : 1;
 314        unsigned initial_buffer : 1;
 315};
 316
 317static size_t rpc_out(void *ptr, size_t eltsize,
 318                size_t nmemb, void *buffer_)
 319{
 320        size_t max = eltsize * nmemb;
 321        struct rpc_state *rpc = buffer_;
 322        size_t avail = rpc->len - rpc->pos;
 323
 324        if (!avail) {
 325                rpc->initial_buffer = 0;
 326                avail = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 327                if (!avail)
 328                        return 0;
 329                rpc->pos = 0;
 330                rpc->len = avail;
 331        }
 332
 333        if (max < avail)
 334                avail = max;
 335        memcpy(ptr, rpc->buf + rpc->pos, avail);
 336        rpc->pos += avail;
 337        return avail;
 338}
 339
 340#ifndef NO_CURL_IOCTL
 341static curlioerr rpc_ioctl(CURL *handle, int cmd, void *clientp)
 342{
 343        struct rpc_state *rpc = clientp;
 344
 345        switch (cmd) {
 346        case CURLIOCMD_NOP:
 347                return CURLIOE_OK;
 348
 349        case CURLIOCMD_RESTARTREAD:
 350                if (rpc->initial_buffer) {
 351                        rpc->pos = 0;
 352                        return CURLIOE_OK;
 353                }
 354                fprintf(stderr, "Unable to rewind rpc post data - try increasing http.postBuffer\n");
 355                return CURLIOE_FAILRESTART;
 356
 357        default:
 358                return CURLIOE_UNKNOWNCMD;
 359        }
 360}
 361#endif
 362
 363static size_t rpc_in(char *ptr, size_t eltsize,
 364                size_t nmemb, void *buffer_)
 365{
 366        size_t size = eltsize * nmemb;
 367        struct rpc_state *rpc = buffer_;
 368        write_or_die(rpc->in, ptr, size);
 369        return size;
 370}
 371
 372static int run_slot(struct active_request_slot *slot)
 373{
 374        int err;
 375        struct slot_results results;
 376
 377        slot->results = &results;
 378        slot->curl_result = curl_easy_perform(slot->curl);
 379        finish_active_slot(slot);
 380
 381        err = handle_curl_result(&results);
 382        if (err != HTTP_OK && err != HTTP_REAUTH) {
 383                error("RPC failed; result=%d, HTTP code = %ld",
 384                      results.curl_result, results.http_code);
 385        }
 386
 387        return err;
 388}
 389
 390static int probe_rpc(struct rpc_state *rpc)
 391{
 392        struct active_request_slot *slot;
 393        struct curl_slist *headers = NULL;
 394        struct strbuf buf = STRBUF_INIT;
 395        int err;
 396
 397        slot = get_active_slot();
 398
 399        headers = curl_slist_append(headers, rpc->hdr_content_type);
 400        headers = curl_slist_append(headers, rpc->hdr_accept);
 401
 402        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 403        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 404        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 405        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, NULL);
 406        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, "0000");
 407        curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, 4);
 408        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 409        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 410        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buf);
 411
 412        err = run_slot(slot);
 413
 414        curl_slist_free_all(headers);
 415        strbuf_release(&buf);
 416        return err;
 417}
 418
 419static int post_rpc(struct rpc_state *rpc)
 420{
 421        struct active_request_slot *slot;
 422        struct curl_slist *headers = NULL;
 423        int use_gzip = rpc->gzip_request;
 424        char *gzip_body = NULL;
 425        size_t gzip_size = 0;
 426        int err, large_request = 0;
 427
 428        /* Try to load the entire request, if we can fit it into the
 429         * allocated buffer space we can use HTTP/1.0 and avoid the
 430         * chunked encoding mess.
 431         */
 432        while (1) {
 433                size_t left = rpc->alloc - rpc->len;
 434                char *buf = rpc->buf + rpc->len;
 435                int n;
 436
 437                if (left < LARGE_PACKET_MAX) {
 438                        large_request = 1;
 439                        use_gzip = 0;
 440                        break;
 441                }
 442
 443                n = packet_read(rpc->out, NULL, NULL, buf, left, 0);
 444                if (!n)
 445                        break;
 446                rpc->len += n;
 447        }
 448
 449        if (large_request) {
 450                do {
 451                        err = probe_rpc(rpc);
 452                } while (err == HTTP_REAUTH);
 453                if (err != HTTP_OK)
 454                        return -1;
 455        }
 456
 457        headers = curl_slist_append(headers, rpc->hdr_content_type);
 458        headers = curl_slist_append(headers, rpc->hdr_accept);
 459        headers = curl_slist_append(headers, "Expect:");
 460
 461retry:
 462        slot = get_active_slot();
 463
 464        curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 465        curl_easy_setopt(slot->curl, CURLOPT_POST, 1);
 466        curl_easy_setopt(slot->curl, CURLOPT_URL, rpc->service_url);
 467        curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 468
 469        if (large_request) {
 470                /* The request body is large and the size cannot be predicted.
 471                 * We must use chunked encoding to send it.
 472                 */
 473                headers = curl_slist_append(headers, "Transfer-Encoding: chunked");
 474                rpc->initial_buffer = 1;
 475                curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, rpc_out);
 476                curl_easy_setopt(slot->curl, CURLOPT_INFILE, rpc);
 477#ifndef NO_CURL_IOCTL
 478                curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, rpc_ioctl);
 479                curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, rpc);
 480#endif
 481                if (options.verbosity > 1) {
 482                        fprintf(stderr, "POST %s (chunked)\n", rpc->service_name);
 483                        fflush(stderr);
 484                }
 485
 486        } else if (gzip_body) {
 487                /*
 488                 * If we are looping to retry authentication, then the previous
 489                 * run will have set up the headers and gzip buffer already,
 490                 * and we just need to send it.
 491                 */
 492                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 493                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 494
 495        } else if (use_gzip && 1024 < rpc->len) {
 496                /* The client backend isn't giving us compressed data so
 497                 * we can try to deflate it ourselves, this may save on.
 498                 * the transfer time.
 499                 */
 500                git_zstream stream;
 501                int ret;
 502
 503                memset(&stream, 0, sizeof(stream));
 504                git_deflate_init_gzip(&stream, Z_BEST_COMPRESSION);
 505                gzip_size = git_deflate_bound(&stream, rpc->len);
 506                gzip_body = xmalloc(gzip_size);
 507
 508                stream.next_in = (unsigned char *)rpc->buf;
 509                stream.avail_in = rpc->len;
 510                stream.next_out = (unsigned char *)gzip_body;
 511                stream.avail_out = gzip_size;
 512
 513                ret = git_deflate(&stream, Z_FINISH);
 514                if (ret != Z_STREAM_END)
 515                        die("cannot deflate request; zlib deflate error %d", ret);
 516
 517                ret = git_deflate_end_gently(&stream);
 518                if (ret != Z_OK)
 519                        die("cannot deflate request; zlib end error %d", ret);
 520
 521                gzip_size = stream.total_out;
 522
 523                headers = curl_slist_append(headers, "Content-Encoding: gzip");
 524                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, gzip_body);
 525                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, gzip_size);
 526
 527                if (options.verbosity > 1) {
 528                        fprintf(stderr, "POST %s (gzip %lu to %lu bytes)\n",
 529                                rpc->service_name,
 530                                (unsigned long)rpc->len, (unsigned long)gzip_size);
 531                        fflush(stderr);
 532                }
 533        } else {
 534                /* We know the complete request size in advance, use the
 535                 * more normal Content-Length approach.
 536                 */
 537                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, rpc->buf);
 538                curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDSIZE, rpc->len);
 539                if (options.verbosity > 1) {
 540                        fprintf(stderr, "POST %s (%lu bytes)\n",
 541                                rpc->service_name, (unsigned long)rpc->len);
 542                        fflush(stderr);
 543                }
 544        }
 545
 546        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 547        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, rpc_in);
 548        curl_easy_setopt(slot->curl, CURLOPT_FILE, rpc);
 549
 550        err = run_slot(slot);
 551        if (err == HTTP_REAUTH && !large_request)
 552                goto retry;
 553        if (err != HTTP_OK)
 554                err = -1;
 555
 556        curl_slist_free_all(headers);
 557        free(gzip_body);
 558        return err;
 559}
 560
 561static int rpc_service(struct rpc_state *rpc, struct discovery *heads)
 562{
 563        const char *svc = rpc->service_name;
 564        struct strbuf buf = STRBUF_INIT;
 565        struct strbuf *preamble = rpc->stdin_preamble;
 566        struct child_process client;
 567        int err = 0;
 568
 569        memset(&client, 0, sizeof(client));
 570        client.in = -1;
 571        client.out = -1;
 572        client.git_cmd = 1;
 573        client.argv = rpc->argv;
 574        if (start_command(&client))
 575                exit(1);
 576        if (preamble)
 577                write_or_die(client.in, preamble->buf, preamble->len);
 578        if (heads)
 579                write_or_die(client.in, heads->buf, heads->len);
 580
 581        rpc->alloc = http_post_buffer;
 582        rpc->buf = xmalloc(rpc->alloc);
 583        rpc->in = client.in;
 584        rpc->out = client.out;
 585        strbuf_init(&rpc->result, 0);
 586
 587        strbuf_addf(&buf, "%s%s", url, svc);
 588        rpc->service_url = strbuf_detach(&buf, NULL);
 589
 590        strbuf_addf(&buf, "Content-Type: application/x-%s-request", svc);
 591        rpc->hdr_content_type = strbuf_detach(&buf, NULL);
 592
 593        strbuf_addf(&buf, "Accept: application/x-%s-result", svc);
 594        rpc->hdr_accept = strbuf_detach(&buf, NULL);
 595
 596        while (!err) {
 597                int n = packet_read(rpc->out, NULL, NULL, rpc->buf, rpc->alloc, 0);
 598                if (!n)
 599                        break;
 600                rpc->pos = 0;
 601                rpc->len = n;
 602                err |= post_rpc(rpc);
 603        }
 604
 605        close(client.in);
 606        client.in = -1;
 607        if (!err) {
 608                strbuf_read(&rpc->result, client.out, 0);
 609        } else {
 610                char buf[4096];
 611                for (;;)
 612                        if (xread(client.out, buf, sizeof(buf)) <= 0)
 613                                break;
 614        }
 615
 616        close(client.out);
 617        client.out = -1;
 618
 619        err |= finish_command(&client);
 620        free(rpc->service_url);
 621        free(rpc->hdr_content_type);
 622        free(rpc->hdr_accept);
 623        free(rpc->buf);
 624        strbuf_release(&buf);
 625        return err;
 626}
 627
 628static int fetch_dumb(int nr_heads, struct ref **to_fetch)
 629{
 630        struct walker *walker;
 631        char **targets = xmalloc(nr_heads * sizeof(char*));
 632        int ret, i;
 633
 634        if (options.depth)
 635                die("dumb http transport does not support --depth");
 636        for (i = 0; i < nr_heads; i++)
 637                targets[i] = xstrdup(sha1_to_hex(to_fetch[i]->old_sha1));
 638
 639        walker = get_http_walker(url);
 640        walker->get_all = 1;
 641        walker->get_tree = 1;
 642        walker->get_history = 1;
 643        walker->get_verbosely = options.verbosity >= 3;
 644        walker->get_recover = 0;
 645        ret = walker_fetch(walker, nr_heads, targets, NULL, NULL);
 646        walker_free(walker);
 647
 648        for (i = 0; i < nr_heads; i++)
 649                free(targets[i]);
 650        free(targets);
 651
 652        return ret ? error("Fetch failed.") : 0;
 653}
 654
 655static int fetch_git(struct discovery *heads,
 656        int nr_heads, struct ref **to_fetch)
 657{
 658        struct rpc_state rpc;
 659        struct strbuf preamble = STRBUF_INIT;
 660        char *depth_arg = NULL;
 661        int argc = 0, i, err;
 662        const char *argv[15];
 663
 664        argv[argc++] = "fetch-pack";
 665        argv[argc++] = "--stateless-rpc";
 666        argv[argc++] = "--stdin";
 667        argv[argc++] = "--lock-pack";
 668        if (options.followtags)
 669                argv[argc++] = "--include-tag";
 670        if (options.thin)
 671                argv[argc++] = "--thin";
 672        if (options.verbosity >= 3) {
 673                argv[argc++] = "-v";
 674                argv[argc++] = "-v";
 675        }
 676        if (!options.progress)
 677                argv[argc++] = "--no-progress";
 678        if (options.depth) {
 679                struct strbuf buf = STRBUF_INIT;
 680                strbuf_addf(&buf, "--depth=%lu", options.depth);
 681                depth_arg = strbuf_detach(&buf, NULL);
 682                argv[argc++] = depth_arg;
 683        }
 684        argv[argc++] = url;
 685        argv[argc++] = NULL;
 686
 687        for (i = 0; i < nr_heads; i++) {
 688                struct ref *ref = to_fetch[i];
 689                if (!ref->name || !*ref->name)
 690                        die("cannot fetch by sha1 over smart http");
 691                packet_buf_write(&preamble, "%s\n", ref->name);
 692        }
 693        packet_buf_flush(&preamble);
 694
 695        memset(&rpc, 0, sizeof(rpc));
 696        rpc.service_name = "git-upload-pack",
 697        rpc.argv = argv;
 698        rpc.stdin_preamble = &preamble;
 699        rpc.gzip_request = 1;
 700
 701        err = rpc_service(&rpc, heads);
 702        if (rpc.result.len)
 703                write_or_die(1, rpc.result.buf, rpc.result.len);
 704        strbuf_release(&rpc.result);
 705        strbuf_release(&preamble);
 706        free(depth_arg);
 707        return err;
 708}
 709
 710static int fetch(int nr_heads, struct ref **to_fetch)
 711{
 712        struct discovery *d = discover_refs("git-upload-pack", 0);
 713        if (d->proto_git)
 714                return fetch_git(d, nr_heads, to_fetch);
 715        else
 716                return fetch_dumb(nr_heads, to_fetch);
 717}
 718
 719static void parse_fetch(struct strbuf *buf)
 720{
 721        struct ref **to_fetch = NULL;
 722        struct ref *list_head = NULL;
 723        struct ref **list = &list_head;
 724        int alloc_heads = 0, nr_heads = 0;
 725
 726        do {
 727                if (!prefixcmp(buf->buf, "fetch ")) {
 728                        char *p = buf->buf + strlen("fetch ");
 729                        char *name;
 730                        struct ref *ref;
 731                        unsigned char old_sha1[20];
 732
 733                        if (strlen(p) < 40 || get_sha1_hex(p, old_sha1))
 734                                die("protocol error: expected sha/ref, got %s'", p);
 735                        if (p[40] == ' ')
 736                                name = p + 41;
 737                        else if (!p[40])
 738                                name = "";
 739                        else
 740                                die("protocol error: expected sha/ref, got %s'", p);
 741
 742                        ref = alloc_ref(name);
 743                        hashcpy(ref->old_sha1, old_sha1);
 744
 745                        *list = ref;
 746                        list = &ref->next;
 747
 748                        ALLOC_GROW(to_fetch, nr_heads + 1, alloc_heads);
 749                        to_fetch[nr_heads++] = ref;
 750                }
 751                else
 752                        die("http transport does not support %s", buf->buf);
 753
 754                strbuf_reset(buf);
 755                if (strbuf_getline(buf, stdin, '\n') == EOF)
 756                        return;
 757                if (!*buf->buf)
 758                        break;
 759        } while (1);
 760
 761        if (fetch(nr_heads, to_fetch))
 762                exit(128); /* error already reported */
 763        free_refs(list_head);
 764        free(to_fetch);
 765
 766        printf("\n");
 767        fflush(stdout);
 768        strbuf_reset(buf);
 769}
 770
 771static int push_dav(int nr_spec, char **specs)
 772{
 773        const char **argv = xmalloc((10 + nr_spec) * sizeof(char*));
 774        int argc = 0, i;
 775
 776        argv[argc++] = "http-push";
 777        argv[argc++] = "--helper-status";
 778        if (options.dry_run)
 779                argv[argc++] = "--dry-run";
 780        if (options.verbosity > 1)
 781                argv[argc++] = "--verbose";
 782        argv[argc++] = url;
 783        for (i = 0; i < nr_spec; i++)
 784                argv[argc++] = specs[i];
 785        argv[argc++] = NULL;
 786
 787        if (run_command_v_opt(argv, RUN_GIT_CMD))
 788                die("git-%s failed", argv[0]);
 789        free(argv);
 790        return 0;
 791}
 792
 793static int push_git(struct discovery *heads, int nr_spec, char **specs)
 794{
 795        struct rpc_state rpc;
 796        int i, err;
 797        struct argv_array args;
 798
 799        argv_array_init(&args);
 800        argv_array_pushl(&args, "send-pack", "--stateless-rpc", "--helper-status",
 801                         NULL);
 802
 803        if (options.thin)
 804                argv_array_push(&args, "--thin");
 805        if (options.dry_run)
 806                argv_array_push(&args, "--dry-run");
 807        if (options.verbosity == 0)
 808                argv_array_push(&args, "--quiet");
 809        else if (options.verbosity > 1)
 810                argv_array_push(&args, "--verbose");
 811        argv_array_push(&args, options.progress ? "--progress" : "--no-progress");
 812        argv_array_push(&args, url);
 813        for (i = 0; i < nr_spec; i++)
 814                argv_array_push(&args, specs[i]);
 815
 816        memset(&rpc, 0, sizeof(rpc));
 817        rpc.service_name = "git-receive-pack",
 818        rpc.argv = args.argv;
 819
 820        err = rpc_service(&rpc, heads);
 821        if (rpc.result.len)
 822                write_or_die(1, rpc.result.buf, rpc.result.len);
 823        strbuf_release(&rpc.result);
 824        argv_array_clear(&args);
 825        return err;
 826}
 827
 828static int push(int nr_spec, char **specs)
 829{
 830        struct discovery *heads = discover_refs("git-receive-pack", 1);
 831        int ret;
 832
 833        if (heads->proto_git)
 834                ret = push_git(heads, nr_spec, specs);
 835        else
 836                ret = push_dav(nr_spec, specs);
 837        free_discovery(heads);
 838        return ret;
 839}
 840
 841static void parse_push(struct strbuf *buf)
 842{
 843        char **specs = NULL;
 844        int alloc_spec = 0, nr_spec = 0, i, ret;
 845
 846        do {
 847                if (!prefixcmp(buf->buf, "push ")) {
 848                        ALLOC_GROW(specs, nr_spec + 1, alloc_spec);
 849                        specs[nr_spec++] = xstrdup(buf->buf + 5);
 850                }
 851                else
 852                        die("http transport does not support %s", buf->buf);
 853
 854                strbuf_reset(buf);
 855                if (strbuf_getline(buf, stdin, '\n') == EOF)
 856                        goto free_specs;
 857                if (!*buf->buf)
 858                        break;
 859        } while (1);
 860
 861        ret = push(nr_spec, specs);
 862        printf("\n");
 863        fflush(stdout);
 864
 865        if (ret)
 866                exit(128); /* error already reported */
 867
 868 free_specs:
 869        for (i = 0; i < nr_spec; i++)
 870                free(specs[i]);
 871        free(specs);
 872}
 873
 874int main(int argc, const char **argv)
 875{
 876        struct strbuf buf = STRBUF_INIT;
 877        int nongit;
 878
 879        git_extract_argv0_path(argv[0]);
 880        setup_git_directory_gently(&nongit);
 881        if (argc < 2) {
 882                fprintf(stderr, "Remote needed\n");
 883                return 1;
 884        }
 885
 886        options.verbosity = 1;
 887        options.progress = !!isatty(2);
 888        options.thin = 1;
 889
 890        remote = remote_get(argv[1]);
 891
 892        if (argc > 2) {
 893                end_url_with_slash(&buf, argv[2]);
 894        } else {
 895                end_url_with_slash(&buf, remote->url[0]);
 896        }
 897
 898        url = strbuf_detach(&buf, NULL);
 899
 900        http_init(remote, url, 0);
 901
 902        do {
 903                if (strbuf_getline(&buf, stdin, '\n') == EOF) {
 904                        if (ferror(stdin))
 905                                fprintf(stderr, "Error reading command stream\n");
 906                        else
 907                                fprintf(stderr, "Unexpected end of command stream\n");
 908                        return 1;
 909                }
 910                if (buf.len == 0)
 911                        break;
 912                if (!prefixcmp(buf.buf, "fetch ")) {
 913                        if (nongit)
 914                                die("Fetch attempted without a local repo");
 915                        parse_fetch(&buf);
 916
 917                } else if (!strcmp(buf.buf, "list") || !prefixcmp(buf.buf, "list ")) {
 918                        int for_push = !!strstr(buf.buf + 4, "for-push");
 919                        output_refs(get_refs(for_push));
 920
 921                } else if (!prefixcmp(buf.buf, "push ")) {
 922                        parse_push(&buf);
 923
 924                } else if (!prefixcmp(buf.buf, "option ")) {
 925                        char *name = buf.buf + strlen("option ");
 926                        char *value = strchr(name, ' ');
 927                        int result;
 928
 929                        if (value)
 930                                *value++ = '\0';
 931                        else
 932                                value = "true";
 933
 934                        result = set_option(name, value);
 935                        if (!result)
 936                                printf("ok\n");
 937                        else if (result < 0)
 938                                printf("error invalid value\n");
 939                        else
 940                                printf("unsupported\n");
 941                        fflush(stdout);
 942
 943                } else if (!strcmp(buf.buf, "capabilities")) {
 944                        printf("fetch\n");
 945                        printf("option\n");
 946                        printf("push\n");
 947                        printf("\n");
 948                        fflush(stdout);
 949                } else {
 950                        fprintf(stderr, "Unknown command '%s'\n", buf.buf);
 951                        return 1;
 952                }
 953                strbuf_reset(&buf);
 954        } while (1);
 955
 956        http_cleanup();
 957
 958        return 0;
 959}