http-backend.con commit Merge branch 'ds/include-exclude' (9755f70)
   1#include "cache.h"
   2#include "config.h"
   3#include "repository.h"
   4#include "refs.h"
   5#include "pkt-line.h"
   6#include "object.h"
   7#include "tag.h"
   8#include "exec-cmd.h"
   9#include "run-command.h"
  10#include "string-list.h"
  11#include "url.h"
  12#include "argv-array.h"
  13#include "packfile.h"
  14#include "object-store.h"
  15#include "protocol.h"
  16
  17static const char content_type[] = "Content-Type";
  18static const char content_length[] = "Content-Length";
  19static const char last_modified[] = "Last-Modified";
  20static int getanyfile = 1;
  21static unsigned long max_request_buffer = 10 * 1024 * 1024;
  22
  23static struct string_list *query_params;
  24
  25struct rpc_service {
  26        const char *name;
  27        const char *config_name;
  28        unsigned buffer_input : 1;
  29        signed enabled : 2;
  30};
  31
  32static struct rpc_service rpc_service[] = {
  33        { "upload-pack", "uploadpack", 1, 1 },
  34        { "receive-pack", "receivepack", 0, -1 },
  35};
  36
  37static struct string_list *get_parameters(void)
  38{
  39        if (!query_params) {
  40                const char *query = getenv("QUERY_STRING");
  41
  42                query_params = xcalloc(1, sizeof(*query_params));
  43                while (query && *query) {
  44                        char *name = url_decode_parameter_name(&query);
  45                        char *value = url_decode_parameter_value(&query);
  46                        struct string_list_item *i;
  47
  48                        i = string_list_lookup(query_params, name);
  49                        if (!i)
  50                                i = string_list_insert(query_params, name);
  51                        else
  52                                free(i->util);
  53                        i->util = value;
  54                }
  55        }
  56        return query_params;
  57}
  58
  59static const char *get_parameter(const char *name)
  60{
  61        struct string_list_item *i;
  62        i = string_list_lookup(get_parameters(), name);
  63        return i ? i->util : NULL;
  64}
  65
  66__attribute__((format (printf, 2, 3)))
  67static void format_write(int fd, const char *fmt, ...)
  68{
  69        static char buffer[1024];
  70
  71        va_list args;
  72        unsigned n;
  73
  74        va_start(args, fmt);
  75        n = vsnprintf(buffer, sizeof(buffer), fmt, args);
  76        va_end(args);
  77        if (n >= sizeof(buffer))
  78                die("protocol error: impossibly long line");
  79
  80        write_or_die(fd, buffer, n);
  81}
  82
  83static void http_status(struct strbuf *hdr, unsigned code, const char *msg)
  84{
  85        strbuf_addf(hdr, "Status: %u %s\r\n", code, msg);
  86}
  87
  88static void hdr_str(struct strbuf *hdr, const char *name, const char *value)
  89{
  90        strbuf_addf(hdr, "%s: %s\r\n", name, value);
  91}
  92
  93static void hdr_int(struct strbuf *hdr, const char *name, uintmax_t value)
  94{
  95        strbuf_addf(hdr, "%s: %" PRIuMAX "\r\n", name, value);
  96}
  97
  98static void hdr_date(struct strbuf *hdr, const char *name, timestamp_t when)
  99{
 100        const char *value = show_date(when, 0, DATE_MODE(RFC2822));
 101        hdr_str(hdr, name, value);
 102}
 103
 104static void hdr_nocache(struct strbuf *hdr)
 105{
 106        hdr_str(hdr, "Expires", "Fri, 01 Jan 1980 00:00:00 GMT");
 107        hdr_str(hdr, "Pragma", "no-cache");
 108        hdr_str(hdr, "Cache-Control", "no-cache, max-age=0, must-revalidate");
 109}
 110
 111static void hdr_cache_forever(struct strbuf *hdr)
 112{
 113        timestamp_t now = time(NULL);
 114        hdr_date(hdr, "Date", now);
 115        hdr_date(hdr, "Expires", now + 31536000);
 116        hdr_str(hdr, "Cache-Control", "public, max-age=31536000");
 117}
 118
 119static void end_headers(struct strbuf *hdr)
 120{
 121        strbuf_add(hdr, "\r\n", 2);
 122        write_or_die(1, hdr->buf, hdr->len);
 123        strbuf_release(hdr);
 124}
 125
 126__attribute__((format (printf, 2, 3)))
 127static NORETURN void not_found(struct strbuf *hdr, const char *err, ...)
 128{
 129        va_list params;
 130
 131        http_status(hdr, 404, "Not Found");
 132        hdr_nocache(hdr);
 133        end_headers(hdr);
 134
 135        va_start(params, err);
 136        if (err && *err)
 137                vfprintf(stderr, err, params);
 138        va_end(params);
 139        exit(0);
 140}
 141
 142__attribute__((format (printf, 2, 3)))
 143static NORETURN void forbidden(struct strbuf *hdr, const char *err, ...)
 144{
 145        va_list params;
 146
 147        http_status(hdr, 403, "Forbidden");
 148        hdr_nocache(hdr);
 149        end_headers(hdr);
 150
 151        va_start(params, err);
 152        if (err && *err)
 153                vfprintf(stderr, err, params);
 154        va_end(params);
 155        exit(0);
 156}
 157
 158static void select_getanyfile(struct strbuf *hdr)
 159{
 160        if (!getanyfile)
 161                forbidden(hdr, "Unsupported service: getanyfile");
 162}
 163
 164static void send_strbuf(struct strbuf *hdr,
 165                        const char *type, struct strbuf *buf)
 166{
 167        hdr_int(hdr, content_length, buf->len);
 168        hdr_str(hdr, content_type, type);
 169        end_headers(hdr);
 170        write_or_die(1, buf->buf, buf->len);
 171}
 172
 173static void send_local_file(struct strbuf *hdr, const char *the_type,
 174                                const char *name)
 175{
 176        char *p = git_pathdup("%s", name);
 177        size_t buf_alloc = 8192;
 178        char *buf = xmalloc(buf_alloc);
 179        int fd;
 180        struct stat sb;
 181
 182        fd = open(p, O_RDONLY);
 183        if (fd < 0)
 184                not_found(hdr, "Cannot open '%s': %s", p, strerror(errno));
 185        if (fstat(fd, &sb) < 0)
 186                die_errno("Cannot stat '%s'", p);
 187
 188        hdr_int(hdr, content_length, sb.st_size);
 189        hdr_str(hdr, content_type, the_type);
 190        hdr_date(hdr, last_modified, sb.st_mtime);
 191        end_headers(hdr);
 192
 193        for (;;) {
 194                ssize_t n = xread(fd, buf, buf_alloc);
 195                if (n < 0)
 196                        die_errno("Cannot read '%s'", p);
 197                if (!n)
 198                        break;
 199                write_or_die(1, buf, n);
 200        }
 201        close(fd);
 202        free(buf);
 203        free(p);
 204}
 205
 206static void get_text_file(struct strbuf *hdr, char *name)
 207{
 208        select_getanyfile(hdr);
 209        hdr_nocache(hdr);
 210        send_local_file(hdr, "text/plain", name);
 211}
 212
 213static void get_loose_object(struct strbuf *hdr, char *name)
 214{
 215        select_getanyfile(hdr);
 216        hdr_cache_forever(hdr);
 217        send_local_file(hdr, "application/x-git-loose-object", name);
 218}
 219
 220static void get_pack_file(struct strbuf *hdr, char *name)
 221{
 222        select_getanyfile(hdr);
 223        hdr_cache_forever(hdr);
 224        send_local_file(hdr, "application/x-git-packed-objects", name);
 225}
 226
 227static void get_idx_file(struct strbuf *hdr, char *name)
 228{
 229        select_getanyfile(hdr);
 230        hdr_cache_forever(hdr);
 231        send_local_file(hdr, "application/x-git-packed-objects-toc", name);
 232}
 233
 234static void http_config(void)
 235{
 236        int i, value = 0;
 237        struct strbuf var = STRBUF_INIT;
 238
 239        git_config_get_bool("http.getanyfile", &getanyfile);
 240        git_config_get_ulong("http.maxrequestbuffer", &max_request_buffer);
 241
 242        for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 243                struct rpc_service *svc = &rpc_service[i];
 244                strbuf_addf(&var, "http.%s", svc->config_name);
 245                if (!git_config_get_bool(var.buf, &value))
 246                        svc->enabled = value;
 247                strbuf_reset(&var);
 248        }
 249
 250        strbuf_release(&var);
 251}
 252
 253static struct rpc_service *select_service(struct strbuf *hdr, const char *name)
 254{
 255        const char *svc_name;
 256        struct rpc_service *svc = NULL;
 257        int i;
 258
 259        if (!skip_prefix(name, "git-", &svc_name))
 260                forbidden(hdr, "Unsupported service: '%s'", name);
 261
 262        for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
 263                struct rpc_service *s = &rpc_service[i];
 264                if (!strcmp(s->name, svc_name)) {
 265                        svc = s;
 266                        break;
 267                }
 268        }
 269
 270        if (!svc)
 271                forbidden(hdr, "Unsupported service: '%s'", name);
 272
 273        if (svc->enabled < 0) {
 274                const char *user = getenv("REMOTE_USER");
 275                svc->enabled = (user && *user) ? 1 : 0;
 276        }
 277        if (!svc->enabled)
 278                forbidden(hdr, "Service not enabled: '%s'", svc->name);
 279        return svc;
 280}
 281
 282static void write_to_child(int out, const unsigned char *buf, ssize_t len, const char *prog_name)
 283{
 284        if (write_in_full(out, buf, len) < 0)
 285                die("unable to write to '%s'", prog_name);
 286}
 287
 288/*
 289 * This is basically strbuf_read(), except that if we
 290 * hit max_request_buffer we die (we'd rather reject a
 291 * maliciously large request than chew up infinite memory).
 292 */
 293static ssize_t read_request_eof(int fd, unsigned char **out)
 294{
 295        size_t len = 0, alloc = 8192;
 296        unsigned char *buf = xmalloc(alloc);
 297
 298        if (max_request_buffer < alloc)
 299                max_request_buffer = alloc;
 300
 301        while (1) {
 302                ssize_t cnt;
 303
 304                cnt = read_in_full(fd, buf + len, alloc - len);
 305                if (cnt < 0) {
 306                        free(buf);
 307                        return -1;
 308                }
 309
 310                /* partial read from read_in_full means we hit EOF */
 311                len += cnt;
 312                if (len < alloc) {
 313                        *out = buf;
 314                        return len;
 315                }
 316
 317                /* otherwise, grow and try again (if we can) */
 318                if (alloc == max_request_buffer)
 319                        die("request was larger than our maximum size (%lu);"
 320                            " try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 321                            max_request_buffer);
 322
 323                alloc = alloc_nr(alloc);
 324                if (alloc > max_request_buffer)
 325                        alloc = max_request_buffer;
 326                REALLOC_ARRAY(buf, alloc);
 327        }
 328}
 329
 330static ssize_t read_request_fixed_len(int fd, ssize_t req_len, unsigned char **out)
 331{
 332        unsigned char *buf = NULL;
 333        ssize_t cnt = 0;
 334
 335        if (max_request_buffer < req_len) {
 336                die("request was larger than our maximum size (%lu): "
 337                    "%" PRIuMAX "; try setting GIT_HTTP_MAX_REQUEST_BUFFER",
 338                    max_request_buffer, (uintmax_t)req_len);
 339        }
 340
 341        buf = xmalloc(req_len);
 342        cnt = read_in_full(fd, buf, req_len);
 343        if (cnt < 0) {
 344                free(buf);
 345                return -1;
 346        }
 347        *out = buf;
 348        return cnt;
 349}
 350
 351static ssize_t get_content_length(void)
 352{
 353        ssize_t val = -1;
 354        const char *str = getenv("CONTENT_LENGTH");
 355
 356        if (str && *str && !git_parse_ssize_t(str, &val))
 357                die("failed to parse CONTENT_LENGTH: %s", str);
 358        return val;
 359}
 360
 361static ssize_t read_request(int fd, unsigned char **out, ssize_t req_len)
 362{
 363        if (req_len < 0)
 364                return read_request_eof(fd, out);
 365        else
 366                return read_request_fixed_len(fd, req_len, out);
 367}
 368
 369static void inflate_request(const char *prog_name, int out, int buffer_input, ssize_t req_len)
 370{
 371        git_zstream stream;
 372        unsigned char *full_request = NULL;
 373        unsigned char in_buf[8192];
 374        unsigned char out_buf[8192];
 375        unsigned long cnt = 0;
 376        int req_len_defined = req_len >= 0;
 377        size_t req_remaining_len = req_len;
 378
 379        memset(&stream, 0, sizeof(stream));
 380        git_inflate_init_gzip_only(&stream);
 381
 382        while (1) {
 383                ssize_t n;
 384
 385                if (buffer_input) {
 386                        if (full_request)
 387                                n = 0; /* nothing left to read */
 388                        else
 389                                n = read_request(0, &full_request, req_len);
 390                        stream.next_in = full_request;
 391                } else {
 392                        ssize_t buffer_len;
 393                        if (req_len_defined && req_remaining_len <= sizeof(in_buf))
 394                                buffer_len = req_remaining_len;
 395                        else
 396                                buffer_len = sizeof(in_buf);
 397                        n = xread(0, in_buf, buffer_len);
 398                        stream.next_in = in_buf;
 399                        if (req_len_defined && n > 0)
 400                                req_remaining_len -= n;
 401                }
 402
 403                if (n <= 0)
 404                        die("request ended in the middle of the gzip stream");
 405                stream.avail_in = n;
 406
 407                while (0 < stream.avail_in) {
 408                        int ret;
 409
 410                        stream.next_out = out_buf;
 411                        stream.avail_out = sizeof(out_buf);
 412
 413                        ret = git_inflate(&stream, Z_NO_FLUSH);
 414                        if (ret != Z_OK && ret != Z_STREAM_END)
 415                                die("zlib error inflating request, result %d", ret);
 416
 417                        n = stream.total_out - cnt;
 418                        write_to_child(out, out_buf, stream.total_out - cnt, prog_name);
 419                        cnt = stream.total_out;
 420
 421                        if (ret == Z_STREAM_END)
 422                                goto done;
 423                }
 424        }
 425
 426done:
 427        git_inflate_end(&stream);
 428        close(out);
 429        free(full_request);
 430}
 431
 432static void copy_request(const char *prog_name, int out, ssize_t req_len)
 433{
 434        unsigned char *buf;
 435        ssize_t n = read_request(0, &buf, req_len);
 436        if (n < 0)
 437                die_errno("error reading request body");
 438        write_to_child(out, buf, n, prog_name);
 439        close(out);
 440        free(buf);
 441}
 442
 443static void pipe_fixed_length(const char *prog_name, int out, size_t req_len)
 444{
 445        unsigned char buf[8192];
 446        size_t remaining_len = req_len;
 447
 448        while (remaining_len > 0) {
 449                size_t chunk_length = remaining_len > sizeof(buf) ? sizeof(buf) : remaining_len;
 450                ssize_t n = xread(0, buf, chunk_length);
 451                if (n < 0)
 452                        die_errno("Reading request failed");
 453                write_to_child(out, buf, n, prog_name);
 454                remaining_len -= n;
 455        }
 456
 457        close(out);
 458}
 459
 460static void run_service(const char **argv, int buffer_input)
 461{
 462        const char *encoding = getenv("HTTP_CONTENT_ENCODING");
 463        const char *user = getenv("REMOTE_USER");
 464        const char *host = getenv("REMOTE_ADDR");
 465        int gzipped_request = 0;
 466        struct child_process cld = CHILD_PROCESS_INIT;
 467        ssize_t req_len = get_content_length();
 468
 469        if (encoding && !strcmp(encoding, "gzip"))
 470                gzipped_request = 1;
 471        else if (encoding && !strcmp(encoding, "x-gzip"))
 472                gzipped_request = 1;
 473
 474        if (!user || !*user)
 475                user = "anonymous";
 476        if (!host || !*host)
 477                host = "(none)";
 478
 479        if (!getenv("GIT_COMMITTER_NAME"))
 480                argv_array_pushf(&cld.env_array, "GIT_COMMITTER_NAME=%s", user);
 481        if (!getenv("GIT_COMMITTER_EMAIL"))
 482                argv_array_pushf(&cld.env_array,
 483                                 "GIT_COMMITTER_EMAIL=%s@http.%s", user, host);
 484
 485        cld.argv = argv;
 486        if (buffer_input || gzipped_request || req_len >= 0)
 487                cld.in = -1;
 488        cld.git_cmd = 1;
 489        cld.clean_on_exit = 1;
 490        cld.wait_after_clean = 1;
 491        if (start_command(&cld))
 492                exit(1);
 493
 494        close(1);
 495        if (gzipped_request)
 496                inflate_request(argv[0], cld.in, buffer_input, req_len);
 497        else if (buffer_input)
 498                copy_request(argv[0], cld.in, req_len);
 499        else if (req_len >= 0)
 500                pipe_fixed_length(argv[0], cld.in, req_len);
 501        else
 502                close(0);
 503
 504        if (finish_command(&cld))
 505                exit(1);
 506}
 507
 508static int show_text_ref(const char *name, const struct object_id *oid,
 509                         int flag, void *cb_data)
 510{
 511        const char *name_nons = strip_namespace(name);
 512        struct strbuf *buf = cb_data;
 513        struct object *o = parse_object(the_repository, oid);
 514        if (!o)
 515                return 0;
 516
 517        strbuf_addf(buf, "%s\t%s\n", oid_to_hex(oid), name_nons);
 518        if (o->type == OBJ_TAG) {
 519                o = deref_tag(the_repository, o, name, 0);
 520                if (!o)
 521                        return 0;
 522                strbuf_addf(buf, "%s\t%s^{}\n", oid_to_hex(&o->oid),
 523                            name_nons);
 524        }
 525        return 0;
 526}
 527
 528static void get_info_refs(struct strbuf *hdr, char *arg)
 529{
 530        const char *service_name = get_parameter("service");
 531        struct strbuf buf = STRBUF_INIT;
 532
 533        hdr_nocache(hdr);
 534
 535        if (service_name) {
 536                const char *argv[] = {NULL /* service name */,
 537                        "--stateless-rpc", "--advertise-refs",
 538                        ".", NULL};
 539                struct rpc_service *svc = select_service(hdr, service_name);
 540
 541                strbuf_addf(&buf, "application/x-git-%s-advertisement",
 542                        svc->name);
 543                hdr_str(hdr, content_type, buf.buf);
 544                end_headers(hdr);
 545
 546
 547                if (determine_protocol_version_server() != protocol_v2) {
 548                        packet_write_fmt(1, "# service=git-%s\n", svc->name);
 549                        packet_flush(1);
 550                }
 551
 552                argv[0] = svc->name;
 553                run_service(argv, 0);
 554
 555        } else {
 556                select_getanyfile(hdr);
 557                for_each_namespaced_ref(show_text_ref, &buf);
 558                send_strbuf(hdr, "text/plain", &buf);
 559        }
 560        strbuf_release(&buf);
 561}
 562
 563static int show_head_ref(const char *refname, const struct object_id *oid,
 564                         int flag, void *cb_data)
 565{
 566        struct strbuf *buf = cb_data;
 567
 568        if (flag & REF_ISSYMREF) {
 569                const char *target = resolve_ref_unsafe(refname,
 570                                                        RESOLVE_REF_READING,
 571                                                        NULL, NULL);
 572
 573                if (target)
 574                        strbuf_addf(buf, "ref: %s\n", strip_namespace(target));
 575        } else {
 576                strbuf_addf(buf, "%s\n", oid_to_hex(oid));
 577        }
 578
 579        return 0;
 580}
 581
 582static void get_head(struct strbuf *hdr, char *arg)
 583{
 584        struct strbuf buf = STRBUF_INIT;
 585
 586        select_getanyfile(hdr);
 587        head_ref_namespaced(show_head_ref, &buf);
 588        send_strbuf(hdr, "text/plain", &buf);
 589        strbuf_release(&buf);
 590}
 591
 592static void get_info_packs(struct strbuf *hdr, char *arg)
 593{
 594        size_t objdirlen = strlen(get_object_directory());
 595        struct strbuf buf = STRBUF_INIT;
 596        struct packed_git *p;
 597        size_t cnt = 0;
 598
 599        select_getanyfile(hdr);
 600        for (p = get_all_packs(the_repository); p; p = p->next) {
 601                if (p->pack_local)
 602                        cnt++;
 603        }
 604
 605        strbuf_grow(&buf, cnt * 53 + 2);
 606        for (p = get_all_packs(the_repository); p; p = p->next) {
 607                if (p->pack_local)
 608                        strbuf_addf(&buf, "P %s\n", p->pack_name + objdirlen + 6);
 609        }
 610        strbuf_addch(&buf, '\n');
 611
 612        hdr_nocache(hdr);
 613        send_strbuf(hdr, "text/plain; charset=utf-8", &buf);
 614        strbuf_release(&buf);
 615}
 616
 617static void check_content_type(struct strbuf *hdr, const char *accepted_type)
 618{
 619        const char *actual_type = getenv("CONTENT_TYPE");
 620
 621        if (!actual_type)
 622                actual_type = "";
 623
 624        if (strcmp(actual_type, accepted_type)) {
 625                http_status(hdr, 415, "Unsupported Media Type");
 626                hdr_nocache(hdr);
 627                end_headers(hdr);
 628                format_write(1,
 629                        "Expected POST with Content-Type '%s',"
 630                        " but received '%s' instead.\n",
 631                        accepted_type, actual_type);
 632                exit(0);
 633        }
 634}
 635
 636static void service_rpc(struct strbuf *hdr, char *service_name)
 637{
 638        const char *argv[] = {NULL, "--stateless-rpc", ".", NULL};
 639        struct rpc_service *svc = select_service(hdr, service_name);
 640        struct strbuf buf = STRBUF_INIT;
 641
 642        strbuf_reset(&buf);
 643        strbuf_addf(&buf, "application/x-git-%s-request", svc->name);
 644        check_content_type(hdr, buf.buf);
 645
 646        hdr_nocache(hdr);
 647
 648        strbuf_reset(&buf);
 649        strbuf_addf(&buf, "application/x-git-%s-result", svc->name);
 650        hdr_str(hdr, content_type, buf.buf);
 651
 652        end_headers(hdr);
 653
 654        argv[0] = svc->name;
 655        run_service(argv, svc->buffer_input);
 656        strbuf_release(&buf);
 657}
 658
 659static int dead;
 660static NORETURN void die_webcgi(const char *err, va_list params)
 661{
 662        if (dead <= 1) {
 663                struct strbuf hdr = STRBUF_INIT;
 664
 665                vreportf("fatal: ", err, params);
 666
 667                http_status(&hdr, 500, "Internal Server Error");
 668                hdr_nocache(&hdr);
 669                end_headers(&hdr);
 670        }
 671        exit(0); /* we successfully reported a failure ;-) */
 672}
 673
 674static int die_webcgi_recursing(void)
 675{
 676        return dead++ > 1;
 677}
 678
 679static char* getdir(void)
 680{
 681        struct strbuf buf = STRBUF_INIT;
 682        char *pathinfo = getenv("PATH_INFO");
 683        char *root = getenv("GIT_PROJECT_ROOT");
 684        char *path = getenv("PATH_TRANSLATED");
 685
 686        if (root && *root) {
 687                if (!pathinfo || !*pathinfo)
 688                        die("GIT_PROJECT_ROOT is set but PATH_INFO is not");
 689                if (daemon_avoid_alias(pathinfo))
 690                        die("'%s': aliased", pathinfo);
 691                end_url_with_slash(&buf, root);
 692                if (pathinfo[0] == '/')
 693                        pathinfo++;
 694                strbuf_addstr(&buf, pathinfo);
 695                return strbuf_detach(&buf, NULL);
 696        } else if (path && *path) {
 697                return xstrdup(path);
 698        } else
 699                die("No GIT_PROJECT_ROOT or PATH_TRANSLATED from server");
 700        return NULL;
 701}
 702
 703static struct service_cmd {
 704        const char *method;
 705        const char *pattern;
 706        void (*imp)(struct strbuf *, char *);
 707} services[] = {
 708        {"GET", "/HEAD$", get_head},
 709        {"GET", "/info/refs$", get_info_refs},
 710        {"GET", "/objects/info/alternates$", get_text_file},
 711        {"GET", "/objects/info/http-alternates$", get_text_file},
 712        {"GET", "/objects/info/packs$", get_info_packs},
 713        {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{38}$", get_loose_object},
 714        {"GET", "/objects/[0-9a-f]{2}/[0-9a-f]{62}$", get_loose_object},
 715        {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.pack$", get_pack_file},
 716        {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.pack$", get_pack_file},
 717        {"GET", "/objects/pack/pack-[0-9a-f]{40}\\.idx$", get_idx_file},
 718        {"GET", "/objects/pack/pack-[0-9a-f]{64}\\.idx$", get_idx_file},
 719
 720        {"POST", "/git-upload-pack$", service_rpc},
 721        {"POST", "/git-receive-pack$", service_rpc}
 722};
 723
 724static int bad_request(struct strbuf *hdr, const struct service_cmd *c)
 725{
 726        const char *proto = getenv("SERVER_PROTOCOL");
 727
 728        if (proto && !strcmp(proto, "HTTP/1.1")) {
 729                http_status(hdr, 405, "Method Not Allowed");
 730                hdr_str(hdr, "Allow",
 731                        !strcmp(c->method, "GET") ? "GET, HEAD" : c->method);
 732        } else
 733                http_status(hdr, 400, "Bad Request");
 734        hdr_nocache(hdr);
 735        end_headers(hdr);
 736        return 0;
 737}
 738
 739int cmd_main(int argc, const char **argv)
 740{
 741        char *method = getenv("REQUEST_METHOD");
 742        char *dir;
 743        struct service_cmd *cmd = NULL;
 744        char *cmd_arg = NULL;
 745        int i;
 746        struct strbuf hdr = STRBUF_INIT;
 747
 748        set_die_routine(die_webcgi);
 749        set_die_is_recursing_routine(die_webcgi_recursing);
 750
 751        if (!method)
 752                die("No REQUEST_METHOD from server");
 753        if (!strcmp(method, "HEAD"))
 754                method = "GET";
 755        dir = getdir();
 756
 757        for (i = 0; i < ARRAY_SIZE(services); i++) {
 758                struct service_cmd *c = &services[i];
 759                regex_t re;
 760                regmatch_t out[1];
 761
 762                if (regcomp(&re, c->pattern, REG_EXTENDED))
 763                        die("Bogus regex in service table: %s", c->pattern);
 764                if (!regexec(&re, dir, 1, out, 0)) {
 765                        size_t n;
 766
 767                        if (strcmp(method, c->method))
 768                                return bad_request(&hdr, c);
 769
 770                        cmd = c;
 771                        n = out[0].rm_eo - out[0].rm_so;
 772                        cmd_arg = xmemdupz(dir + out[0].rm_so + 1, n - 1);
 773                        dir[out[0].rm_so] = 0;
 774                        break;
 775                }
 776                regfree(&re);
 777        }
 778
 779        if (!cmd)
 780                not_found(&hdr, "Request not supported: '%s'", dir);
 781
 782        setup_path();
 783        if (!enter_repo(dir, 0))
 784                not_found(&hdr, "Not a git repository: '%s'", dir);
 785        if (!getenv("GIT_HTTP_EXPORT_ALL") &&
 786            access("git-daemon-export-ok", F_OK) )
 787                not_found(&hdr, "Repository not exported: '%s'", dir);
 788
 789        http_config();
 790        max_request_buffer = git_env_ulong("GIT_HTTP_MAX_REQUEST_BUFFER",
 791                                           max_request_buffer);
 792
 793        cmd->imp(&hdr, cmd_arg);
 794        return 0;
 795}