Andrew's git / gitweb.git / http.c
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http.con commit http.c::http_fetch_ref(): use the new http API (0d5896e)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests;
   5int http_is_verbose;
   6
   7#ifdef USE_CURL_MULTI
   8static int max_requests = -1;
   9static CURLM *curlm;
  10#endif
  11#ifndef NO_CURL_EASY_DUPHANDLE
  12static CURL *curl_default;
  13#endif
  14char curl_errorstr[CURL_ERROR_SIZE];
  15
  16static int curl_ssl_verify = -1;
  17static const char *ssl_cert;
  18#if LIBCURL_VERSION_NUM >= 0x070902
  19static const char *ssl_key;
  20#endif
  21#if LIBCURL_VERSION_NUM >= 0x070908
  22static const char *ssl_capath;
  23#endif
  24static const char *ssl_cainfo;
  25static long curl_low_speed_limit = -1;
  26static long curl_low_speed_time = -1;
  27static int curl_ftp_no_epsv;
  28static const char *curl_http_proxy;
  29static char *user_name, *user_pass;
  30
  31static struct curl_slist *pragma_header;
  32
  33struct curl_slist *no_pragma_header;
  34
  35static struct active_request_slot *active_queue_head;
  36
  37size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  38{
  39        size_t size = eltsize * nmemb;
  40        struct buffer *buffer = buffer_;
  41
  42        if (size > buffer->buf.len - buffer->posn)
  43                size = buffer->buf.len - buffer->posn;
  44        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  45        buffer->posn += size;
  46
  47        return size;
  48}
  49
  50#ifndef NO_CURL_IOCTL
  51curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  52{
  53        struct buffer *buffer = clientp;
  54
  55        switch (cmd) {
  56        case CURLIOCMD_NOP:
  57                return CURLIOE_OK;
  58
  59        case CURLIOCMD_RESTARTREAD:
  60                buffer->posn = 0;
  61                return CURLIOE_OK;
  62
  63        default:
  64                return CURLIOE_UNKNOWNCMD;
  65        }
  66}
  67#endif
  68
  69size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  70{
  71        size_t size = eltsize * nmemb;
  72        struct strbuf *buffer = buffer_;
  73
  74        strbuf_add(buffer, ptr, size);
  75        data_received++;
  76        return size;
  77}
  78
  79size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  80{
  81        data_received++;
  82        return eltsize * nmemb;
  83}
  84
  85static void finish_active_slot(struct active_request_slot *slot);
  86
  87#ifdef USE_CURL_MULTI
  88static void process_curl_messages(void)
  89{
  90        int num_messages;
  91        struct active_request_slot *slot;
  92        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  93
  94        while (curl_message != NULL) {
  95                if (curl_message->msg == CURLMSG_DONE) {
  96                        int curl_result = curl_message->data.result;
  97                        slot = active_queue_head;
  98                        while (slot != NULL &&
  99                               slot->curl != curl_message->easy_handle)
 100                                slot = slot->next;
 101                        if (slot != NULL) {
 102                                curl_multi_remove_handle(curlm, slot->curl);
 103                                slot->curl_result = curl_result;
 104                                finish_active_slot(slot);
 105                        } else {
 106                                fprintf(stderr, "Received DONE message for unknown request!\n");
 107                        }
 108                } else {
 109                        fprintf(stderr, "Unknown CURL message received: %d\n",
 110                                (int)curl_message->msg);
 111                }
 112                curl_message = curl_multi_info_read(curlm, &num_messages);
 113        }
 114}
 115#endif
 116
 117static int http_options(const char *var, const char *value, void *cb)
 118{
 119        if (!strcmp("http.sslverify", var)) {
 120                curl_ssl_verify = git_config_bool(var, value);
 121                return 0;
 122        }
 123        if (!strcmp("http.sslcert", var))
 124                return git_config_string(&ssl_cert, var, value);
 125#if LIBCURL_VERSION_NUM >= 0x070902
 126        if (!strcmp("http.sslkey", var))
 127                return git_config_string(&ssl_key, var, value);
 128#endif
 129#if LIBCURL_VERSION_NUM >= 0x070908
 130        if (!strcmp("http.sslcapath", var))
 131                return git_config_string(&ssl_capath, var, value);
 132#endif
 133        if (!strcmp("http.sslcainfo", var))
 134                return git_config_string(&ssl_cainfo, var, value);
 135#ifdef USE_CURL_MULTI
 136        if (!strcmp("http.maxrequests", var)) {
 137                max_requests = git_config_int(var, value);
 138                return 0;
 139        }
 140#endif
 141        if (!strcmp("http.lowspeedlimit", var)) {
 142                curl_low_speed_limit = (long)git_config_int(var, value);
 143                return 0;
 144        }
 145        if (!strcmp("http.lowspeedtime", var)) {
 146                curl_low_speed_time = (long)git_config_int(var, value);
 147                return 0;
 148        }
 149
 150        if (!strcmp("http.noepsv", var)) {
 151                curl_ftp_no_epsv = git_config_bool(var, value);
 152                return 0;
 153        }
 154        if (!strcmp("http.proxy", var))
 155                return git_config_string(&curl_http_proxy, var, value);
 156
 157        /* Fall back on the default ones */
 158        return git_default_config(var, value, cb);
 159}
 160
 161static void init_curl_http_auth(CURL *result)
 162{
 163        if (user_name) {
 164                struct strbuf up = STRBUF_INIT;
 165                if (!user_pass)
 166                        user_pass = xstrdup(getpass("Password: "));
 167                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 168                curl_easy_setopt(result, CURLOPT_USERPWD,
 169                                 strbuf_detach(&up, NULL));
 170        }
 171}
 172
 173static CURL *get_curl_handle(void)
 174{
 175        CURL *result = curl_easy_init();
 176
 177        if (!curl_ssl_verify) {
 178                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 179                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 180        } else {
 181                /* Verify authenticity of the peer's certificate */
 182                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 183                /* The name in the cert must match whom we tried to connect */
 184                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 185        }
 186
 187#if LIBCURL_VERSION_NUM >= 0x070907
 188        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 189#endif
 190
 191        init_curl_http_auth(result);
 192
 193        if (ssl_cert != NULL)
 194                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 195#if LIBCURL_VERSION_NUM >= 0x070902
 196        if (ssl_key != NULL)
 197                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 198#endif
 199#if LIBCURL_VERSION_NUM >= 0x070908
 200        if (ssl_capath != NULL)
 201                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 202#endif
 203        if (ssl_cainfo != NULL)
 204                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 205        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 206
 207        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 208                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 209                                 curl_low_speed_limit);
 210                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 211                                 curl_low_speed_time);
 212        }
 213
 214        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 215
 216        if (getenv("GIT_CURL_VERBOSE"))
 217                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 218
 219        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 220
 221        if (curl_ftp_no_epsv)
 222                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 223
 224        if (curl_http_proxy)
 225                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 226
 227        return result;
 228}
 229
 230static void http_auth_init(const char *url)
 231{
 232        char *at, *colon, *cp, *slash;
 233        int len;
 234
 235        cp = strstr(url, "://");
 236        if (!cp)
 237                return;
 238
 239        /*
 240         * Ok, the URL looks like "proto://something".  Which one?
 241         * "proto://<user>:<pass>@<host>/...",
 242         * "proto://<user>@<host>/...", or just
 243         * "proto://<host>/..."?
 244         */
 245        cp += 3;
 246        at = strchr(cp, '@');
 247        colon = strchr(cp, ':');
 248        slash = strchrnul(cp, '/');
 249        if (!at || slash <= at)
 250                return; /* No credentials */
 251        if (!colon || at <= colon) {
 252                /* Only username */
 253                len = at - cp;
 254                user_name = xmalloc(len + 1);
 255                memcpy(user_name, cp, len);
 256                user_name[len] = '\0';
 257                user_pass = NULL;
 258        } else {
 259                len = colon - cp;
 260                user_name = xmalloc(len + 1);
 261                memcpy(user_name, cp, len);
 262                user_name[len] = '\0';
 263                len = at - (colon + 1);
 264                user_pass = xmalloc(len + 1);
 265                memcpy(user_pass, colon + 1, len);
 266                user_pass[len] = '\0';
 267        }
 268}
 269
 270static void set_from_env(const char **var, const char *envname)
 271{
 272        const char *val = getenv(envname);
 273        if (val)
 274                *var = val;
 275}
 276
 277void http_init(struct remote *remote)
 278{
 279        char *low_speed_limit;
 280        char *low_speed_time;
 281
 282        http_is_verbose = 0;
 283
 284        git_config(http_options, NULL);
 285
 286        curl_global_init(CURL_GLOBAL_ALL);
 287
 288        if (remote && remote->http_proxy)
 289                curl_http_proxy = xstrdup(remote->http_proxy);
 290
 291        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 292        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 293
 294#ifdef USE_CURL_MULTI
 295        {
 296                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 297                if (http_max_requests != NULL)
 298                        max_requests = atoi(http_max_requests);
 299        }
 300
 301        curlm = curl_multi_init();
 302        if (curlm == NULL) {
 303                fprintf(stderr, "Error creating curl multi handle.\n");
 304                exit(1);
 305        }
 306#endif
 307
 308        if (getenv("GIT_SSL_NO_VERIFY"))
 309                curl_ssl_verify = 0;
 310
 311        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 312#if LIBCURL_VERSION_NUM >= 0x070902
 313        set_from_env(&ssl_key, "GIT_SSL_KEY");
 314#endif
 315#if LIBCURL_VERSION_NUM >= 0x070908
 316        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 317#endif
 318        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 319
 320        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 321        if (low_speed_limit != NULL)
 322                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 323        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 324        if (low_speed_time != NULL)
 325                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 326
 327        if (curl_ssl_verify == -1)
 328                curl_ssl_verify = 1;
 329
 330#ifdef USE_CURL_MULTI
 331        if (max_requests < 1)
 332                max_requests = DEFAULT_MAX_REQUESTS;
 333#endif
 334
 335        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 336                curl_ftp_no_epsv = 1;
 337
 338        if (remote && remote->url && remote->url[0])
 339                http_auth_init(remote->url[0]);
 340
 341#ifndef NO_CURL_EASY_DUPHANDLE
 342        curl_default = get_curl_handle();
 343#endif
 344}
 345
 346void http_cleanup(void)
 347{
 348        struct active_request_slot *slot = active_queue_head;
 349
 350        while (slot != NULL) {
 351                struct active_request_slot *next = slot->next;
 352                if (slot->curl != NULL) {
 353#ifdef USE_CURL_MULTI
 354                        curl_multi_remove_handle(curlm, slot->curl);
 355#endif
 356                        curl_easy_cleanup(slot->curl);
 357                }
 358                free(slot);
 359                slot = next;
 360        }
 361        active_queue_head = NULL;
 362
 363#ifndef NO_CURL_EASY_DUPHANDLE
 364        curl_easy_cleanup(curl_default);
 365#endif
 366
 367#ifdef USE_CURL_MULTI
 368        curl_multi_cleanup(curlm);
 369#endif
 370        curl_global_cleanup();
 371
 372        curl_slist_free_all(pragma_header);
 373        pragma_header = NULL;
 374
 375        curl_slist_free_all(no_pragma_header);
 376        no_pragma_header = NULL;
 377
 378        if (curl_http_proxy) {
 379                free((void *)curl_http_proxy);
 380                curl_http_proxy = NULL;
 381        }
 382}
 383
 384struct active_request_slot *get_active_slot(void)
 385{
 386        struct active_request_slot *slot = active_queue_head;
 387        struct active_request_slot *newslot;
 388
 389#ifdef USE_CURL_MULTI
 390        int num_transfers;
 391
 392        /* Wait for a slot to open up if the queue is full */
 393        while (active_requests >= max_requests) {
 394                curl_multi_perform(curlm, &num_transfers);
 395                if (num_transfers < active_requests)
 396                        process_curl_messages();
 397        }
 398#endif
 399
 400        while (slot != NULL && slot->in_use)
 401                slot = slot->next;
 402
 403        if (slot == NULL) {
 404                newslot = xmalloc(sizeof(*newslot));
 405                newslot->curl = NULL;
 406                newslot->in_use = 0;
 407                newslot->next = NULL;
 408
 409                slot = active_queue_head;
 410                if (slot == NULL) {
 411                        active_queue_head = newslot;
 412                } else {
 413                        while (slot->next != NULL)
 414                                slot = slot->next;
 415                        slot->next = newslot;
 416                }
 417                slot = newslot;
 418        }
 419
 420        if (slot->curl == NULL) {
 421#ifdef NO_CURL_EASY_DUPHANDLE
 422                slot->curl = get_curl_handle();
 423#else
 424                slot->curl = curl_easy_duphandle(curl_default);
 425#endif
 426        }
 427
 428        active_requests++;
 429        slot->in_use = 1;
 430        slot->local = NULL;
 431        slot->results = NULL;
 432        slot->finished = NULL;
 433        slot->callback_data = NULL;
 434        slot->callback_func = NULL;
 435        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 436        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 437        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 438        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 439        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 440        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 441        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 442
 443        return slot;
 444}
 445
 446int start_active_slot(struct active_request_slot *slot)
 447{
 448#ifdef USE_CURL_MULTI
 449        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 450        int num_transfers;
 451
 452        if (curlm_result != CURLM_OK &&
 453            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 454                active_requests--;
 455                slot->in_use = 0;
 456                return 0;
 457        }
 458
 459        /*
 460         * We know there must be something to do, since we just added
 461         * something.
 462         */
 463        curl_multi_perform(curlm, &num_transfers);
 464#endif
 465        return 1;
 466}
 467
 468#ifdef USE_CURL_MULTI
 469struct fill_chain {
 470        void *data;
 471        int (*fill)(void *);
 472        struct fill_chain *next;
 473};
 474
 475static struct fill_chain *fill_cfg;
 476
 477void add_fill_function(void *data, int (*fill)(void *))
 478{
 479        struct fill_chain *new = xmalloc(sizeof(*new));
 480        struct fill_chain **linkp = &fill_cfg;
 481        new->data = data;
 482        new->fill = fill;
 483        new->next = NULL;
 484        while (*linkp)
 485                linkp = &(*linkp)->next;
 486        *linkp = new;
 487}
 488
 489void fill_active_slots(void)
 490{
 491        struct active_request_slot *slot = active_queue_head;
 492
 493        while (active_requests < max_requests) {
 494                struct fill_chain *fill;
 495                for (fill = fill_cfg; fill; fill = fill->next)
 496                        if (fill->fill(fill->data))
 497                                break;
 498
 499                if (!fill)
 500                        break;
 501        }
 502
 503        while (slot != NULL) {
 504                if (!slot->in_use && slot->curl != NULL) {
 505                        curl_easy_cleanup(slot->curl);
 506                        slot->curl = NULL;
 507                }
 508                slot = slot->next;
 509        }
 510}
 511
 512void step_active_slots(void)
 513{
 514        int num_transfers;
 515        CURLMcode curlm_result;
 516
 517        do {
 518                curlm_result = curl_multi_perform(curlm, &num_transfers);
 519        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 520        if (num_transfers < active_requests) {
 521                process_curl_messages();
 522                fill_active_slots();
 523        }
 524}
 525#endif
 526
 527void run_active_slot(struct active_request_slot *slot)
 528{
 529#ifdef USE_CURL_MULTI
 530        long last_pos = 0;
 531        long current_pos;
 532        fd_set readfds;
 533        fd_set writefds;
 534        fd_set excfds;
 535        int max_fd;
 536        struct timeval select_timeout;
 537        int finished = 0;
 538
 539        slot->finished = &finished;
 540        while (!finished) {
 541                data_received = 0;
 542                step_active_slots();
 543
 544                if (!data_received && slot->local != NULL) {
 545                        current_pos = ftell(slot->local);
 546                        if (current_pos > last_pos)
 547                                data_received++;
 548                        last_pos = current_pos;
 549                }
 550
 551                if (slot->in_use && !data_received) {
 552                        max_fd = 0;
 553                        FD_ZERO(&readfds);
 554                        FD_ZERO(&writefds);
 555                        FD_ZERO(&excfds);
 556                        select_timeout.tv_sec = 0;
 557                        select_timeout.tv_usec = 50000;
 558                        select(max_fd, &readfds, &writefds,
 559                               &excfds, &select_timeout);
 560                }
 561        }
 562#else
 563        while (slot->in_use) {
 564                slot->curl_result = curl_easy_perform(slot->curl);
 565                finish_active_slot(slot);
 566        }
 567#endif
 568}
 569
 570static void closedown_active_slot(struct active_request_slot *slot)
 571{
 572        active_requests--;
 573        slot->in_use = 0;
 574}
 575
 576void release_active_slot(struct active_request_slot *slot)
 577{
 578        closedown_active_slot(slot);
 579        if (slot->curl) {
 580#ifdef USE_CURL_MULTI
 581                curl_multi_remove_handle(curlm, slot->curl);
 582#endif
 583                curl_easy_cleanup(slot->curl);
 584                slot->curl = NULL;
 585        }
 586#ifdef USE_CURL_MULTI
 587        fill_active_slots();
 588#endif
 589}
 590
 591static void finish_active_slot(struct active_request_slot *slot)
 592{
 593        closedown_active_slot(slot);
 594        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 595
 596        if (slot->finished != NULL)
 597                (*slot->finished) = 1;
 598
 599        /* Store slot results so they can be read after the slot is reused */
 600        if (slot->results != NULL) {
 601                slot->results->curl_result = slot->curl_result;
 602                slot->results->http_code = slot->http_code;
 603        }
 604
 605        /* Run callback if appropriate */
 606        if (slot->callback_func != NULL)
 607                slot->callback_func(slot->callback_data);
 608}
 609
 610void finish_all_active_slots(void)
 611{
 612        struct active_request_slot *slot = active_queue_head;
 613
 614        while (slot != NULL)
 615                if (slot->in_use) {
 616                        run_active_slot(slot);
 617                        slot = active_queue_head;
 618                } else {
 619                        slot = slot->next;
 620                }
 621}
 622
 623/* Helpers for modifying and creating URLs */
 624static inline int needs_quote(int ch)
 625{
 626        if (((ch >= 'A') && (ch <= 'Z'))
 627                        || ((ch >= 'a') && (ch <= 'z'))
 628                        || ((ch >= '0') && (ch <= '9'))
 629                        || (ch == '/')
 630                        || (ch == '-')
 631                        || (ch == '.'))
 632                return 0;
 633        return 1;
 634}
 635
 636static inline int hex(int v)
 637{
 638        if (v < 10)
 639                return '0' + v;
 640        else
 641                return 'A' + v - 10;
 642}
 643
 644static void end_url_with_slash(struct strbuf *buf, const char *url)
 645{
 646        strbuf_addstr(buf, url);
 647        if (buf->len && buf->buf[buf->len - 1] != '/')
 648                strbuf_addstr(buf, "/");
 649}
 650
 651static char *quote_ref_url(const char *base, const char *ref)
 652{
 653        struct strbuf buf = STRBUF_INIT;
 654        const char *cp;
 655        int ch;
 656
 657        end_url_with_slash(&buf, base);
 658
 659        for (cp = ref; (ch = *cp) != 0; cp++)
 660                if (needs_quote(ch))
 661                        strbuf_addf(&buf, "%%%02x", ch);
 662                else
 663                        strbuf_addch(&buf, *cp);
 664
 665        return strbuf_detach(&buf, NULL);
 666}
 667
 668/* http_request() targets */
 669#define HTTP_REQUEST_STRBUF     0
 670#define HTTP_REQUEST_FILE       1
 671
 672static int http_request(const char *url, void *result, int target, int options)
 673{
 674        struct active_request_slot *slot;
 675        struct slot_results results;
 676        struct curl_slist *headers = NULL;
 677        struct strbuf buf = STRBUF_INIT;
 678        int ret;
 679
 680        slot = get_active_slot();
 681        slot->results = &results;
 682        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 683
 684        if (result == NULL) {
 685                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 686        } else {
 687                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 688                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 689
 690                if (target == HTTP_REQUEST_FILE) {
 691                        long posn = ftell(result);
 692                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 693                                         fwrite);
 694                        if (posn > 0) {
 695                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 696                                headers = curl_slist_append(headers, buf.buf);
 697                                strbuf_reset(&buf);
 698                        }
 699                        slot->local = result;
 700                } else
 701                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 702                                         fwrite_buffer);
 703        }
 704
 705        strbuf_addstr(&buf, "Pragma:");
 706        if (options & HTTP_NO_CACHE)
 707                strbuf_addstr(&buf, " no-cache");
 708
 709        headers = curl_slist_append(headers, buf.buf);
 710
 711        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 712        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 713
 714        if (start_active_slot(slot)) {
 715                run_active_slot(slot);
 716                if (results.curl_result == CURLE_OK)
 717                        ret = HTTP_OK;
 718                else if (missing_target(&results))
 719                        ret = HTTP_MISSING_TARGET;
 720                else
 721                        ret = HTTP_ERROR;
 722        } else {
 723                error("Unable to start HTTP request for %s", url);
 724                ret = HTTP_START_FAILED;
 725        }
 726
 727        slot->local = NULL;
 728        curl_slist_free_all(headers);
 729        strbuf_release(&buf);
 730
 731        return ret;
 732}
 733
 734int http_get_strbuf(const char *url, struct strbuf *result, int options)
 735{
 736        return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 737}
 738
 739int http_get_file(const char *url, const char *filename, int options)
 740{
 741        int ret;
 742        struct strbuf tmpfile = STRBUF_INIT;
 743        FILE *result;
 744
 745        strbuf_addf(&tmpfile, "%s.temp", filename);
 746        result = fopen(tmpfile.buf, "a");
 747        if (! result) {
 748                error("Unable to open local file %s", tmpfile.buf);
 749                ret = HTTP_ERROR;
 750                goto cleanup;
 751        }
 752
 753        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 754        fclose(result);
 755
 756        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 757                ret = HTTP_ERROR;
 758cleanup:
 759        strbuf_release(&tmpfile);
 760        return ret;
 761}
 762
 763int http_error(const char *url, int ret)
 764{
 765        /* http_request has already handled HTTP_START_FAILED. */
 766        if (ret != HTTP_START_FAILED)
 767                error("%s while accessing %s\n", curl_errorstr, url);
 768
 769        return ret;
 770}
 771
 772int http_fetch_ref(const char *base, struct ref *ref)
 773{
 774        char *url;
 775        struct strbuf buffer = STRBUF_INIT;
 776        int ret = -1;
 777
 778        url = quote_ref_url(base, ref->name);
 779        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 780                strbuf_rtrim(&buffer);
 781                if (buffer.len == 40)
 782                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 783                else if (!prefixcmp(buffer.buf, "ref: ")) {
 784                        ref->symref = xstrdup(buffer.buf + 5);
 785                        ret = 0;
 786                }
 787        }
 788
 789        strbuf_release(&buffer);
 790        free(url);
 791        return ret;
 792}