http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4 #include "run-command.h"
   5 #include "url.h"
   6 #include "credential.h"
   7 #include "version.h"
   8
   9 int active_requests;
  10 int http_is_verbose;
  11 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  12
  13 #if LIBCURL_VERSION_NUM >= 0x070a06
  14 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  15 #endif
  16
  17 static int min_curl_sessions = 1;
  18 static int curl_session_count;
  19 #ifdef USE_CURL_MULTI
  20 static int max_requests = -1;
  21 static CURLM *curlm;
  22 #endif
  23 #ifndef NO_CURL_EASY_DUPHANDLE
  24 static CURL *curl_default;
  25 #endif
  26
  27 #define PREV_BUF_SIZE 4096
  28 #define RANGE_HEADER_SIZE 30
  29
  30 char curl_errorstr[CURL_ERROR_SIZE];
  31
  32 static int curl_ssl_verify = -1;
  33 static const char *ssl_cert;
  34 #if LIBCURL_VERSION_NUM >= 0x070903
  35 static const char *ssl_key;
  36 #endif
  37 #if LIBCURL_VERSION_NUM >= 0x070908
  38 static const char *ssl_capath;
  39 #endif
  40 static const char *ssl_cainfo;
  41 static long curl_low_speed_limit = -1;
  42 static long curl_low_speed_time = -1;
  43 static int curl_ftp_no_epsv;
  44 static const char *curl_http_proxy;
  45 static const char *curl_cookie_file;
  46 static struct credential http_auth = CREDENTIAL_INIT;
  47 static int http_proactive_auth;
  48 static const char *user_agent;
  49
  50 #if LIBCURL_VERSION_NUM >= 0x071700
  51 /* Use CURLOPT_KEYPASSWD as is */
  52 #elif LIBCURL_VERSION_NUM >= 0x070903
  53 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  54 #else
  55 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  56 #endif
  57
  58 static struct credential cert_auth = CREDENTIAL_INIT;
  59 static int ssl_cert_password_required;
  60
  61 static struct curl_slist *pragma_header;
  62 static struct curl_slist *no_pragma_header;
  63
  64 static struct active_request_slot *active_queue_head;
  65
  66 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  67 {
  68         size_t size = eltsize * nmemb;
  69         struct buffer *buffer = buffer_;
  70
  71         if (size > buffer->buf.len - buffer->posn)
  72                 size = buffer->buf.len - buffer->posn;
  73         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  74         buffer->posn += size;
  75
  76         return size;
  77 }
  78
  79 #ifndef NO_CURL_IOCTL
  80 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  81 {
  82         struct buffer *buffer = clientp;
  83
  84         switch (cmd) {
  85         case CURLIOCMD_NOP:
  86                 return CURLIOE_OK;
  87
  88         case CURLIOCMD_RESTARTREAD:
  89                 buffer->posn = 0;
  90                 return CURLIOE_OK;
  91
  92         default:
  93                 return CURLIOE_UNKNOWNCMD;
  94         }
  95 }
  96 #endif
  97
  98 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  99 {
 100         size_t size = eltsize * nmemb;
 101         struct strbuf *buffer = buffer_;
 102
 103         strbuf_add(buffer, ptr, size);
 104         return size;
 105 }
 106
 107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 108 {
 109         return eltsize * nmemb;
 110 }
 111
 112 #ifdef USE_CURL_MULTI
 113 static void process_curl_messages(void)
 114 {
 115         int num_messages;
 116         struct active_request_slot *slot;
 117         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 118
 119         while (curl_message != NULL) {
 120                 if (curl_message->msg == CURLMSG_DONE) {
 121                         int curl_result = curl_message->data.result;
 122                         slot = active_queue_head;
 123                         while (slot != NULL &&
 124                                slot->curl != curl_message->easy_handle)
 125                                 slot = slot->next;
 126                         if (slot != NULL) {
 127                                 curl_multi_remove_handle(curlm, slot->curl);
 128                                 slot->curl_result = curl_result;
 129                                 finish_active_slot(slot);
 130                         } else {
 131                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 132                         }
 133                 } else {
 134                         fprintf(stderr, "Unknown CURL message received: %d\n",
 135                                 (int)curl_message->msg);
 136                 }
 137                 curl_message = curl_multi_info_read(curlm, &num_messages);
 138         }
 139 }
 140 #endif
 141
 142 static int http_options(const char *var, const char *value, void *cb)
 143 {
 144         if (!strcmp("http.sslverify", var)) {
 145                 curl_ssl_verify = git_config_bool(var, value);
 146                 return 0;
 147         }
 148         if (!strcmp("http.sslcert", var))
 149                 return git_config_string(&ssl_cert, var, value);
 150 #if LIBCURL_VERSION_NUM >= 0x070903
 151         if (!strcmp("http.sslkey", var))
 152                 return git_config_string(&ssl_key, var, value);
 153 #endif
 154 #if LIBCURL_VERSION_NUM >= 0x070908
 155         if (!strcmp("http.sslcapath", var))
 156                 return git_config_string(&ssl_capath, var, value);
 157 #endif
 158         if (!strcmp("http.sslcainfo", var))
 159                 return git_config_string(&ssl_cainfo, var, value);
 160         if (!strcmp("http.sslcertpasswordprotected", var)) {
 161                 if (git_config_bool(var, value))
 162                         ssl_cert_password_required = 1;
 163                 return 0;
 164         }
 165         if (!strcmp("http.minsessions", var)) {
 166                 min_curl_sessions = git_config_int(var, value);
 167 #ifndef USE_CURL_MULTI
 168                 if (min_curl_sessions > 1)
 169                         min_curl_sessions = 1;
 170 #endif
 171                 return 0;
 172         }
 173 #ifdef USE_CURL_MULTI
 174         if (!strcmp("http.maxrequests", var)) {
 175                 max_requests = git_config_int(var, value);
 176                 return 0;
 177         }
 178 #endif
 179         if (!strcmp("http.lowspeedlimit", var)) {
 180                 curl_low_speed_limit = (long)git_config_int(var, value);
 181                 return 0;
 182         }
 183         if (!strcmp("http.lowspeedtime", var)) {
 184                 curl_low_speed_time = (long)git_config_int(var, value);
 185                 return 0;
 186         }
 187
 188         if (!strcmp("http.noepsv", var)) {
 189                 curl_ftp_no_epsv = git_config_bool(var, value);
 190                 return 0;
 191         }
 192         if (!strcmp("http.proxy", var))
 193                 return git_config_string(&curl_http_proxy, var, value);
 194
 195         if (!strcmp("http.cookiefile", var))
 196                 return git_config_string(&curl_cookie_file, var, value);
 197
 198         if (!strcmp("http.postbuffer", var)) {
 199                 http_post_buffer = git_config_int(var, value);
 200                 if (http_post_buffer < LARGE_PACKET_MAX)
 201                         http_post_buffer = LARGE_PACKET_MAX;
 202                 return 0;
 203         }
 204
 205         if (!strcmp("http.useragent", var))
 206                 return git_config_string(&user_agent, var, value);
 207
 208         /* Fall back on the default ones */
 209         return git_default_config(var, value, cb);
 210 }
 211
 212 static void init_curl_http_auth(CURL *result)
 213 {
 214         if (!http_auth.username)
 215                 return;
 216
 217         credential_fill(&http_auth);
 218
 219 #if LIBCURL_VERSION_NUM >= 0x071301
 220         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 221         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 222 #else
 223         {
 224                 static struct strbuf up = STRBUF_INIT;
 225                 strbuf_reset(&up);
 226                 strbuf_addf(&up, "%s:%s",
 227                             http_auth.username, http_auth.password);
 228                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 229         }
 230 #endif
 231 }
 232
 233 static int has_cert_password(void)
 234 {
 235         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 236                 return 0;
 237         if (!cert_auth.password) {
 238                 cert_auth.protocol = xstrdup("cert");
 239                 cert_auth.username = xstrdup("");
 240                 cert_auth.path = xstrdup(ssl_cert);
 241                 credential_fill(&cert_auth);
 242         }
 243         return 1;
 244 }
 245
 246 static CURL *get_curl_handle(void)
 247 {
 248         CURL *result = curl_easy_init();
 249
 250         if (!curl_ssl_verify) {
 251                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 252                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 253         } else {
 254                 /* Verify authenticity of the peer's certificate */
 255                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 256                 /* The name in the cert must match whom we tried to connect */
 257                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 258         }
 259
 260 #if LIBCURL_VERSION_NUM >= 0x070907
 261         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 262 #endif
 263 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 264         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 265 #endif
 266
 267         if (http_proactive_auth)
 268                 init_curl_http_auth(result);
 269
 270         if (ssl_cert != NULL)
 271                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 272         if (has_cert_password())
 273                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 274 #if LIBCURL_VERSION_NUM >= 0x070903
 275         if (ssl_key != NULL)
 276                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 277 #endif
 278 #if LIBCURL_VERSION_NUM >= 0x070908
 279         if (ssl_capath != NULL)
 280                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 281 #endif
 282         if (ssl_cainfo != NULL)
 283                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 284         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 285
 286         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 287                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 288                                  curl_low_speed_limit);
 289                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 290                                  curl_low_speed_time);
 291         }
 292
 293         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 294 #if LIBCURL_VERSION_NUM >= 0x071301
 295         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 296 #elif LIBCURL_VERSION_NUM >= 0x071101
 297         curl_easy_setopt(result, CURLOPT_POST301, 1);
 298 #endif
 299
 300         if (getenv("GIT_CURL_VERBOSE"))
 301                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 302
 303         curl_easy_setopt(result, CURLOPT_USERAGENT,
 304                 user_agent ? user_agent : git_user_agent());
 305
 306         if (curl_ftp_no_epsv)
 307                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 308
 309         if (curl_http_proxy) {
 310                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 311                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 312         }
 313
 314         return result;
 315 }
 316
 317 static void set_from_env(const char **var, const char *envname)
 318 {
 319         const char *val = getenv(envname);
 320         if (val)
 321                 *var = val;
 322 }
 323
 324 void http_init(struct remote *remote, const char *url, int proactive_auth)
 325 {
 326         char *low_speed_limit;
 327         char *low_speed_time;
 328
 329         http_is_verbose = 0;
 330
 331         git_config(http_options, NULL);
 332
 333         curl_global_init(CURL_GLOBAL_ALL);
 334
 335         http_proactive_auth = proactive_auth;
 336
 337         if (remote && remote->http_proxy)
 338                 curl_http_proxy = xstrdup(remote->http_proxy);
 339
 340         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 341         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 342
 343 #ifdef USE_CURL_MULTI
 344         {
 345                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 346                 if (http_max_requests != NULL)
 347                         max_requests = atoi(http_max_requests);
 348         }
 349
 350         curlm = curl_multi_init();
 351         if (curlm == NULL) {
 352                 fprintf(stderr, "Error creating curl multi handle.\n");
 353                 exit(1);
 354         }
 355 #endif
 356
 357         if (getenv("GIT_SSL_NO_VERIFY"))
 358                 curl_ssl_verify = 0;
 359
 360         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 361 #if LIBCURL_VERSION_NUM >= 0x070903
 362         set_from_env(&ssl_key, "GIT_SSL_KEY");
 363 #endif
 364 #if LIBCURL_VERSION_NUM >= 0x070908
 365         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 366 #endif
 367         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 368
 369         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 370
 371         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 372         if (low_speed_limit != NULL)
 373                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 374         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 375         if (low_speed_time != NULL)
 376                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 377
 378         if (curl_ssl_verify == -1)
 379                 curl_ssl_verify = 1;
 380
 381         curl_session_count = 0;
 382 #ifdef USE_CURL_MULTI
 383         if (max_requests < 1)
 384                 max_requests = DEFAULT_MAX_REQUESTS;
 385 #endif
 386
 387         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 388                 curl_ftp_no_epsv = 1;
 389
 390         if (url) {
 391                 credential_from_url(&http_auth, url);
 392                 if (!ssl_cert_password_required &&
 393                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 394                     !prefixcmp(url, "https://"))
 395                         ssl_cert_password_required = 1;
 396         }
 397
 398 #ifndef NO_CURL_EASY_DUPHANDLE
 399         curl_default = get_curl_handle();
 400 #endif
 401 }
 402
 403 void http_cleanup(void)
 404 {
 405         struct active_request_slot *slot = active_queue_head;
 406
 407         while (slot != NULL) {
 408                 struct active_request_slot *next = slot->next;
 409                 if (slot->curl != NULL) {
 410 #ifdef USE_CURL_MULTI
 411                         curl_multi_remove_handle(curlm, slot->curl);
 412 #endif
 413                         curl_easy_cleanup(slot->curl);
 414                 }
 415                 free(slot);
 416                 slot = next;
 417         }
 418         active_queue_head = NULL;
 419
 420 #ifndef NO_CURL_EASY_DUPHANDLE
 421         curl_easy_cleanup(curl_default);
 422 #endif
 423
 424 #ifdef USE_CURL_MULTI
 425         curl_multi_cleanup(curlm);
 426 #endif
 427         curl_global_cleanup();
 428
 429         curl_slist_free_all(pragma_header);
 430         pragma_header = NULL;
 431
 432         curl_slist_free_all(no_pragma_header);
 433         no_pragma_header = NULL;
 434
 435         if (curl_http_proxy) {
 436                 free((void *)curl_http_proxy);
 437                 curl_http_proxy = NULL;
 438         }
 439
 440         if (cert_auth.password != NULL) {
 441                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 442                 free(cert_auth.password);
 443                 cert_auth.password = NULL;
 444         }
 445         ssl_cert_password_required = 0;
 446 }
 447
 448 struct active_request_slot *get_active_slot(void)
 449 {
 450         struct active_request_slot *slot = active_queue_head;
 451         struct active_request_slot *newslot;
 452
 453 #ifdef USE_CURL_MULTI
 454         int num_transfers;
 455
 456         /* Wait for a slot to open up if the queue is full */
 457         while (active_requests >= max_requests) {
 458                 curl_multi_perform(curlm, &num_transfers);
 459                 if (num_transfers < active_requests)
 460                         process_curl_messages();
 461         }
 462 #endif
 463
 464         while (slot != NULL && slot->in_use)
 465                 slot = slot->next;
 466
 467         if (slot == NULL) {
 468                 newslot = xmalloc(sizeof(*newslot));
 469                 newslot->curl = NULL;
 470                 newslot->in_use = 0;
 471                 newslot->next = NULL;
 472
 473                 slot = active_queue_head;
 474                 if (slot == NULL) {
 475                         active_queue_head = newslot;
 476                 } else {
 477                         while (slot->next != NULL)
 478                                 slot = slot->next;
 479                         slot->next = newslot;
 480                 }
 481                 slot = newslot;
 482         }
 483
 484         if (slot->curl == NULL) {
 485 #ifdef NO_CURL_EASY_DUPHANDLE
 486                 slot->curl = get_curl_handle();
 487 #else
 488                 slot->curl = curl_easy_duphandle(curl_default);
 489 #endif
 490                 curl_session_count++;
 491         }
 492
 493         active_requests++;
 494         slot->in_use = 1;
 495         slot->results = NULL;
 496         slot->finished = NULL;
 497         slot->callback_data = NULL;
 498         slot->callback_func = NULL;
 499         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 500         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 501         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 502         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 503         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 504         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 505         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 506         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 507         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 508         if (http_auth.password)
 509                 init_curl_http_auth(slot->curl);
 510
 511         return slot;
 512 }
 513
 514 int start_active_slot(struct active_request_slot *slot)
 515 {
 516 #ifdef USE_CURL_MULTI
 517         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 518         int num_transfers;
 519
 520         if (curlm_result != CURLM_OK &&
 521             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 522                 active_requests--;
 523                 slot->in_use = 0;
 524                 return 0;
 525         }
 526
 527         /*
 528          * We know there must be something to do, since we just added
 529          * something.
 530          */
 531         curl_multi_perform(curlm, &num_transfers);
 532 #endif
 533         return 1;
 534 }
 535
 536 #ifdef USE_CURL_MULTI
 537 struct fill_chain {
 538         void *data;
 539         int (*fill)(void *);
 540         struct fill_chain *next;
 541 };
 542
 543 static struct fill_chain *fill_cfg;
 544
 545 void add_fill_function(void *data, int (*fill)(void *))
 546 {
 547         struct fill_chain *new = xmalloc(sizeof(*new));
 548         struct fill_chain **linkp = &fill_cfg;
 549         new->data = data;
 550         new->fill = fill;
 551         new->next = NULL;
 552         while (*linkp)
 553                 linkp = &(*linkp)->next;
 554         *linkp = new;
 555 }
 556
 557 void fill_active_slots(void)
 558 {
 559         struct active_request_slot *slot = active_queue_head;
 560
 561         while (active_requests < max_requests) {
 562                 struct fill_chain *fill;
 563                 for (fill = fill_cfg; fill; fill = fill->next)
 564                         if (fill->fill(fill->data))
 565                                 break;
 566
 567                 if (!fill)
 568                         break;
 569         }
 570
 571         while (slot != NULL) {
 572                 if (!slot->in_use && slot->curl != NULL
 573                         && curl_session_count > min_curl_sessions) {
 574                         curl_easy_cleanup(slot->curl);
 575                         slot->curl = NULL;
 576                         curl_session_count--;
 577                 }
 578                 slot = slot->next;
 579         }
 580 }
 581
 582 void step_active_slots(void)
 583 {
 584         int num_transfers;
 585         CURLMcode curlm_result;
 586
 587         do {
 588                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 589         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 590         if (num_transfers < active_requests) {
 591                 process_curl_messages();
 592                 fill_active_slots();
 593         }
 594 }
 595 #endif
 596
 597 void run_active_slot(struct active_request_slot *slot)
 598 {
 599 #ifdef USE_CURL_MULTI
 600         fd_set readfds;
 601         fd_set writefds;
 602         fd_set excfds;
 603         int max_fd;
 604         struct timeval select_timeout;
 605         int finished = 0;
 606
 607         slot->finished = &finished;
 608         while (!finished) {
 609                 step_active_slots();
 610
 611                 if (slot->in_use) {
 612 #if LIBCURL_VERSION_NUM >= 0x070f04
 613                         long curl_timeout;
 614                         curl_multi_timeout(curlm, &curl_timeout);
 615                         if (curl_timeout == 0) {
 616                                 continue;
 617                         } else if (curl_timeout == -1) {
 618                                 select_timeout.tv_sec  = 0;
 619                                 select_timeout.tv_usec = 50000;
 620                         } else {
 621                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 622                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 623                         }
 624 #else
 625                         select_timeout.tv_sec  = 0;
 626                         select_timeout.tv_usec = 50000;
 627 #endif
 628
 629                         max_fd = -1;
 630                         FD_ZERO(&readfds);
 631                         FD_ZERO(&writefds);
 632                         FD_ZERO(&excfds);
 633                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 634
 635                         /*
 636                          * It can happen that curl_multi_timeout returns a pathologically
 637                          * long timeout when curl_multi_fdset returns no file descriptors
 638                          * to read.  See commit message for more details.
 639                          */
 640                         if (max_fd < 0 &&
 641                             (select_timeout.tv_sec > 0 ||
 642                              select_timeout.tv_usec > 50000)) {
 643                                 select_timeout.tv_sec  = 0;
 644                                 select_timeout.tv_usec = 50000;
 645                         }
 646
 647                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 648                 }
 649         }
 650 #else
 651         while (slot->in_use) {
 652                 slot->curl_result = curl_easy_perform(slot->curl);
 653                 finish_active_slot(slot);
 654         }
 655 #endif
 656 }
 657
 658 static void closedown_active_slot(struct active_request_slot *slot)
 659 {
 660         active_requests--;
 661         slot->in_use = 0;
 662 }
 663
 664 static void release_active_slot(struct active_request_slot *slot)
 665 {
 666         closedown_active_slot(slot);
 667         if (slot->curl && curl_session_count > min_curl_sessions) {
 668 #ifdef USE_CURL_MULTI
 669                 curl_multi_remove_handle(curlm, slot->curl);
 670 #endif
 671                 curl_easy_cleanup(slot->curl);
 672                 slot->curl = NULL;
 673                 curl_session_count--;
 674         }
 675 #ifdef USE_CURL_MULTI
 676         fill_active_slots();
 677 #endif
 678 }
 679
 680 void finish_active_slot(struct active_request_slot *slot)
 681 {
 682         closedown_active_slot(slot);
 683         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 684
 685         if (slot->finished != NULL)
 686                 (*slot->finished) = 1;
 687
 688         /* Store slot results so they can be read after the slot is reused */
 689         if (slot->results != NULL) {
 690                 slot->results->curl_result = slot->curl_result;
 691                 slot->results->http_code = slot->http_code;
 692         }
 693
 694         /* Run callback if appropriate */
 695         if (slot->callback_func != NULL)
 696                 slot->callback_func(slot->callback_data);
 697 }
 698
 699 void finish_all_active_slots(void)
 700 {
 701         struct active_request_slot *slot = active_queue_head;
 702
 703         while (slot != NULL)
 704                 if (slot->in_use) {
 705                         run_active_slot(slot);
 706                         slot = active_queue_head;
 707                 } else {
 708                         slot = slot->next;
 709                 }
 710 }
 711
 712 /* Helpers for modifying and creating URLs */
 713 static inline int needs_quote(int ch)
 714 {
 715         if (((ch >= 'A') && (ch <= 'Z'))
 716                         || ((ch >= 'a') && (ch <= 'z'))
 717                         || ((ch >= '0') && (ch <= '9'))
 718                         || (ch == '/')
 719                         || (ch == '-')
 720                         || (ch == '.'))
 721                 return 0;
 722         return 1;
 723 }
 724
 725 static char *quote_ref_url(const char *base, const char *ref)
 726 {
 727         struct strbuf buf = STRBUF_INIT;
 728         const char *cp;
 729         int ch;
 730
 731         end_url_with_slash(&buf, base);
 732
 733         for (cp = ref; (ch = *cp) != 0; cp++)
 734                 if (needs_quote(ch))
 735                         strbuf_addf(&buf, "%%%02x", ch);
 736                 else
 737                         strbuf_addch(&buf, *cp);
 738
 739         return strbuf_detach(&buf, NULL);
 740 }
 741
 742 void append_remote_object_url(struct strbuf *buf, const char *url,
 743                               const char *hex,
 744                               int only_two_digit_prefix)
 745 {
 746         end_url_with_slash(buf, url);
 747
 748         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 749         if (!only_two_digit_prefix)
 750                 strbuf_addf(buf, "%s", hex+2);
 751 }
 752
 753 char *get_remote_object_url(const char *url, const char *hex,
 754                             int only_two_digit_prefix)
 755 {
 756         struct strbuf buf = STRBUF_INIT;
 757         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 758         return strbuf_detach(&buf, NULL);
 759 }
 760
 761 int handle_curl_result(struct slot_results *results)
 762 {
 763         if (results->curl_result == CURLE_OK) {
 764                 credential_approve(&http_auth);
 765                 return HTTP_OK;
 766         } else if (missing_target(results))
 767                 return HTTP_MISSING_TARGET;
 768         else if (results->http_code == 401) {
 769                 if (http_auth.username && http_auth.password) {
 770                         credential_reject(&http_auth);
 771                         return HTTP_NOAUTH;
 772                 } else {
 773                         credential_fill(&http_auth);
 774                         return HTTP_REAUTH;
 775                 }
 776         } else {
 777 #if LIBCURL_VERSION_NUM >= 0x070c00
 778                 if (!curl_errorstr[0])
 779                         strlcpy(curl_errorstr,
 780                                 curl_easy_strerror(results->curl_result),
 781                                 sizeof(curl_errorstr));
 782 #endif
 783                 return HTTP_ERROR;
 784         }
 785 }
 786
 787 /* http_request() targets */
 788 #define HTTP_REQUEST_STRBUF     0
 789 #define HTTP_REQUEST_FILE       1
 790
 791 static int http_request(const char *url, void *result, int target, int options)
 792 {
 793         struct active_request_slot *slot;
 794         struct slot_results results;
 795         struct curl_slist *headers = NULL;
 796         struct strbuf buf = STRBUF_INIT;
 797         int ret;
 798
 799         slot = get_active_slot();
 800         slot->results = &results;
 801         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 802
 803         if (result == NULL) {
 804                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 805         } else {
 806                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 807                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 808
 809                 if (target == HTTP_REQUEST_FILE) {
 810                         long posn = ftell(result);
 811                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 812                                          fwrite);
 813                         if (posn > 0) {
 814                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 815                                 headers = curl_slist_append(headers, buf.buf);
 816                                 strbuf_reset(&buf);
 817                         }
 818                 } else
 819                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 820                                          fwrite_buffer);
 821         }
 822
 823         strbuf_addstr(&buf, "Pragma:");
 824         if (options & HTTP_NO_CACHE)
 825                 strbuf_addstr(&buf, " no-cache");
 826
 827         headers = curl_slist_append(headers, buf.buf);
 828
 829         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 830         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 831         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
 832
 833         if (start_active_slot(slot)) {
 834                 run_active_slot(slot);
 835                 ret = handle_curl_result(&results);
 836         } else {
 837                 error("Unable to start HTTP request for %s", url);
 838                 ret = HTTP_START_FAILED;
 839         }
 840
 841         curl_slist_free_all(headers);
 842         strbuf_release(&buf);
 843
 844         return ret;
 845 }
 846
 847 static int http_request_reauth(const char *url, void *result, int target,
 848                                int options)
 849 {
 850         int ret = http_request(url, result, target, options);
 851         if (ret != HTTP_REAUTH)
 852                 return ret;
 853         return http_request(url, result, target, options);
 854 }
 855
 856 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 857 {
 858         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 859 }
 860
 861 /*
 862  * Downloads a URL and stores the result in the given file.
 863  *
 864  * If a previous interrupted download is detected (i.e. a previous temporary
 865  * file is still around) the download is resumed.
 866  */
 867 static int http_get_file(const char *url, const char *filename, int options)
 868 {
 869         int ret;
 870         struct strbuf tmpfile = STRBUF_INIT;
 871         FILE *result;
 872
 873         strbuf_addf(&tmpfile, "%s.temp", filename);
 874         result = fopen(tmpfile.buf, "a");
 875         if (! result) {
 876                 error("Unable to open local file %s", tmpfile.buf);
 877                 ret = HTTP_ERROR;
 878                 goto cleanup;
 879         }
 880
 881         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 882         fclose(result);
 883
 884         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 885                 ret = HTTP_ERROR;
 886 cleanup:
 887         strbuf_release(&tmpfile);
 888         return ret;
 889 }
 890
 891 int http_error(const char *url, int ret)
 892 {
 893         /* http_request has already handled HTTP_START_FAILED. */
 894         if (ret != HTTP_START_FAILED)
 895                 error("%s while accessing %s", curl_errorstr, url);
 896
 897         return ret;
 898 }
 899
 900 int http_fetch_ref(const char *base, struct ref *ref)
 901 {
 902         char *url;
 903         struct strbuf buffer = STRBUF_INIT;
 904         int ret = -1;
 905
 906         url = quote_ref_url(base, ref->name);
 907         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 908                 strbuf_rtrim(&buffer);
 909                 if (buffer.len == 40)
 910                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 911                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 912                         ref->symref = xstrdup(buffer.buf + 5);
 913                         ret = 0;
 914                 }
 915         }
 916
 917         strbuf_release(&buffer);
 918         free(url);
 919         return ret;
 920 }
 921
 922 /* Helpers for fetching packs */
 923 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 924 {
 925         char *url, *tmp;
 926         struct strbuf buf = STRBUF_INIT;
 927
 928         if (http_is_verbose)
 929                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 930
 931         end_url_with_slash(&buf, base_url);
 932         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 933         url = strbuf_detach(&buf, NULL);
 934
 935         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 936         tmp = strbuf_detach(&buf, NULL);
 937
 938         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 939                 error("Unable to get pack index %s", url);
 940                 free(tmp);
 941                 tmp = NULL;
 942         }
 943
 944         free(url);
 945         return tmp;
 946 }
 947
 948 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 949         unsigned char *sha1, const char *base_url)
 950 {
 951         struct packed_git *new_pack;
 952         char *tmp_idx = NULL;
 953         int ret;
 954
 955         if (has_pack_index(sha1)) {
 956                 new_pack = parse_pack_index(sha1, NULL);
 957                 if (!new_pack)
 958                         return -1; /* parse_pack_index() already issued error message */
 959                 goto add_pack;
 960         }
 961
 962         tmp_idx = fetch_pack_index(sha1, base_url);
 963         if (!tmp_idx)
 964                 return -1;
 965
 966         new_pack = parse_pack_index(sha1, tmp_idx);
 967         if (!new_pack) {
 968                 unlink(tmp_idx);
 969                 free(tmp_idx);
 970
 971                 return -1; /* parse_pack_index() already issued error message */
 972         }
 973
 974         ret = verify_pack_index(new_pack);
 975         if (!ret) {
 976                 close_pack_index(new_pack);
 977                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
 978         }
 979         free(tmp_idx);
 980         if (ret)
 981                 return -1;
 982
 983 add_pack:
 984         new_pack->next = *packs_head;
 985         *packs_head = new_pack;
 986         return 0;
 987 }
 988
 989 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 990 {
 991         int ret = 0, i = 0;
 992         char *url, *data;
 993         struct strbuf buf = STRBUF_INIT;
 994         unsigned char sha1[20];
 995
 996         end_url_with_slash(&buf, base_url);
 997         strbuf_addstr(&buf, "objects/info/packs");
 998         url = strbuf_detach(&buf, NULL);
 999
1000         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1001         if (ret != HTTP_OK)
1002                 goto cleanup;
1003
1004         data = buf.buf;
1005         while (i < buf.len) {
1006                 switch (data[i]) {
1007                 case 'P':
1008                         i++;
1009                         if (i + 52 <= buf.len &&
1010                             !prefixcmp(data + i, " pack-") &&
1011                             !prefixcmp(data + i + 46, ".pack\n")) {
1012                                 get_sha1_hex(data + i + 6, sha1);
1013                                 fetch_and_setup_pack_index(packs_head, sha1,
1014                                                       base_url);
1015                                 i += 51;
1016                                 break;
1017                         }
1018                 default:
1019                         while (i < buf.len && data[i] != '\n')
1020                                 i++;
1021                 }
1022                 i++;
1023         }
1024
1025 cleanup:
1026         free(url);
1027         return ret;
1028 }
1029
1030 void release_http_pack_request(struct http_pack_request *preq)
1031 {
1032         if (preq->packfile != NULL) {
1033                 fclose(preq->packfile);
1034                 preq->packfile = NULL;
1035         }
1036         if (preq->range_header != NULL) {
1037                 curl_slist_free_all(preq->range_header);
1038                 preq->range_header = NULL;
1039         }
1040         preq->slot = NULL;
1041         free(preq->url);
1042 }
1043
1044 int finish_http_pack_request(struct http_pack_request *preq)
1045 {
1046         struct packed_git **lst;
1047         struct packed_git *p = preq->target;
1048         char *tmp_idx;
1049         struct child_process ip;
1050         const char *ip_argv[8];
1051
1052         close_pack_index(p);
1053
1054         fclose(preq->packfile);
1055         preq->packfile = NULL;
1056
1057         lst = preq->lst;
1058         while (*lst != p)
1059                 lst = &((*lst)->next);
1060         *lst = (*lst)->next;
1061
1062         tmp_idx = xstrdup(preq->tmpfile);
1063         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1064                ".idx.temp");
1065
1066         ip_argv[0] = "index-pack";
1067         ip_argv[1] = "-o";
1068         ip_argv[2] = tmp_idx;
1069         ip_argv[3] = preq->tmpfile;
1070         ip_argv[4] = NULL;
1071
1072         memset(&ip, 0, sizeof(ip));
1073         ip.argv = ip_argv;
1074         ip.git_cmd = 1;
1075         ip.no_stdin = 1;
1076         ip.no_stdout = 1;
1077
1078         if (run_command(&ip)) {
1079                 unlink(preq->tmpfile);
1080                 unlink(tmp_idx);
1081                 free(tmp_idx);
1082                 return -1;
1083         }
1084
1085         unlink(sha1_pack_index_name(p->sha1));
1086
1087         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1088          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1089                 free(tmp_idx);
1090                 return -1;
1091         }
1092
1093         install_packed_git(p);
1094         free(tmp_idx);
1095         return 0;
1096 }
1097
1098 struct http_pack_request *new_http_pack_request(
1099         struct packed_git *target, const char *base_url)
1100 {
1101         long prev_posn = 0;
1102         char range[RANGE_HEADER_SIZE];
1103         struct strbuf buf = STRBUF_INIT;
1104         struct http_pack_request *preq;
1105
1106         preq = xcalloc(1, sizeof(*preq));
1107         preq->target = target;
1108
1109         end_url_with_slash(&buf, base_url);
1110         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1111                 sha1_to_hex(target->sha1));
1112         preq->url = strbuf_detach(&buf, NULL);
1113
1114         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1115                 sha1_pack_name(target->sha1));
1116         preq->packfile = fopen(preq->tmpfile, "a");
1117         if (!preq->packfile) {
1118                 error("Unable to open local file %s for pack",
1119                       preq->tmpfile);
1120                 goto abort;
1121         }
1122
1123         preq->slot = get_active_slot();
1124         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1125         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1126         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1127         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1128                 no_pragma_header);
1129
1130         /*
1131          * If there is data present from a previous transfer attempt,
1132          * resume where it left off
1133          */
1134         prev_posn = ftell(preq->packfile);
1135         if (prev_posn>0) {
1136                 if (http_is_verbose)
1137                         fprintf(stderr,
1138                                 "Resuming fetch of pack %s at byte %ld\n",
1139                                 sha1_to_hex(target->sha1), prev_posn);
1140                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1141                 preq->range_header = curl_slist_append(NULL, range);
1142                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1143                         preq->range_header);
1144         }
1145
1146         return preq;
1147
1148 abort:
1149         free(preq->url);
1150         free(preq);
1151         return NULL;
1152 }
1153
1154 /* Helpers for fetching objects (loose) */
1155 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1156                                void *data)
1157 {
1158         unsigned char expn[4096];
1159         size_t size = eltsize * nmemb;
1160         int posn = 0;
1161         struct http_object_request *freq =
1162                 (struct http_object_request *)data;
1163         do {
1164                 ssize_t retval = xwrite(freq->localfile,
1165                                         (char *) ptr + posn, size - posn);
1166                 if (retval < 0)
1167                         return posn;
1168                 posn += retval;
1169         } while (posn < size);
1170
1171         freq->stream.avail_in = size;
1172         freq->stream.next_in = (void *)ptr;
1173         do {
1174                 freq->stream.next_out = expn;
1175                 freq->stream.avail_out = sizeof(expn);
1176                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1177                 git_SHA1_Update(&freq->c, expn,
1178                                 sizeof(expn) - freq->stream.avail_out);
1179         } while (freq->stream.avail_in && freq->zret == Z_OK);
1180         return size;
1181 }
1182
1183 struct http_object_request *new_http_object_request(const char *base_url,
1184         unsigned char *sha1)
1185 {
1186         char *hex = sha1_to_hex(sha1);
1187         char *filename;
1188         char prevfile[PATH_MAX];
1189         int prevlocal;
1190         char prev_buf[PREV_BUF_SIZE];
1191         ssize_t prev_read = 0;
1192         long prev_posn = 0;
1193         char range[RANGE_HEADER_SIZE];
1194         struct curl_slist *range_header = NULL;
1195         struct http_object_request *freq;
1196
1197         freq = xcalloc(1, sizeof(*freq));
1198         hashcpy(freq->sha1, sha1);
1199         freq->localfile = -1;
1200
1201         filename = sha1_file_name(sha1);
1202         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1203                  "%s.temp", filename);
1204
1205         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1206         unlink_or_warn(prevfile);
1207         rename(freq->tmpfile, prevfile);
1208         unlink_or_warn(freq->tmpfile);
1209
1210         if (freq->localfile != -1)
1211                 error("fd leakage in start: %d", freq->localfile);
1212         freq->localfile = open(freq->tmpfile,
1213                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1214         /*
1215          * This could have failed due to the "lazy directory creation";
1216          * try to mkdir the last path component.
1217          */
1218         if (freq->localfile < 0 && errno == ENOENT) {
1219                 char *dir = strrchr(freq->tmpfile, '/');
1220                 if (dir) {
1221                         *dir = 0;
1222                         mkdir(freq->tmpfile, 0777);
1223                         *dir = '/';
1224                 }
1225                 freq->localfile = open(freq->tmpfile,
1226                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1227         }
1228
1229         if (freq->localfile < 0) {
1230                 error("Couldn't create temporary file %s: %s",
1231                       freq->tmpfile, strerror(errno));
1232                 goto abort;
1233         }
1234
1235         git_inflate_init(&freq->stream);
1236
1237         git_SHA1_Init(&freq->c);
1238
1239         freq->url = get_remote_object_url(base_url, hex, 0);
1240
1241         /*
1242          * If a previous temp file is present, process what was already
1243          * fetched.
1244          */
1245         prevlocal = open(prevfile, O_RDONLY);
1246         if (prevlocal != -1) {
1247                 do {
1248                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1249                         if (prev_read>0) {
1250                                 if (fwrite_sha1_file(prev_buf,
1251                                                      1,
1252                                                      prev_read,
1253                                                      freq) == prev_read) {
1254                                         prev_posn += prev_read;
1255                                 } else {
1256                                         prev_read = -1;
1257                                 }
1258                         }
1259                 } while (prev_read > 0);
1260                 close(prevlocal);
1261         }
1262         unlink_or_warn(prevfile);
1263
1264         /*
1265          * Reset inflate/SHA1 if there was an error reading the previous temp
1266          * file; also rewind to the beginning of the local file.
1267          */
1268         if (prev_read == -1) {
1269                 memset(&freq->stream, 0, sizeof(freq->stream));
1270                 git_inflate_init(&freq->stream);
1271                 git_SHA1_Init(&freq->c);
1272                 if (prev_posn>0) {
1273                         prev_posn = 0;
1274                         lseek(freq->localfile, 0, SEEK_SET);
1275                         if (ftruncate(freq->localfile, 0) < 0) {
1276                                 error("Couldn't truncate temporary file %s: %s",
1277                                           freq->tmpfile, strerror(errno));
1278                                 goto abort;
1279                         }
1280                 }
1281         }
1282
1283         freq->slot = get_active_slot();
1284
1285         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1286         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1287         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1288         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1289         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1290
1291         /*
1292          * If we have successfully processed data from a previous fetch
1293          * attempt, only fetch the data we don't already have.
1294          */
1295         if (prev_posn>0) {
1296                 if (http_is_verbose)
1297                         fprintf(stderr,
1298                                 "Resuming fetch of object %s at byte %ld\n",
1299                                 hex, prev_posn);
1300                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1301                 range_header = curl_slist_append(range_header, range);
1302                 curl_easy_setopt(freq->slot->curl,
1303                                  CURLOPT_HTTPHEADER, range_header);
1304         }
1305
1306         return freq;
1307
1308 abort:
1309         free(freq->url);
1310         free(freq);
1311         return NULL;
1312 }
1313
1314 void process_http_object_request(struct http_object_request *freq)
1315 {
1316         if (freq->slot == NULL)
1317                 return;
1318         freq->curl_result = freq->slot->curl_result;
1319         freq->http_code = freq->slot->http_code;
1320         freq->slot = NULL;
1321 }
1322
1323 int finish_http_object_request(struct http_object_request *freq)
1324 {
1325         struct stat st;
1326
1327         close(freq->localfile);
1328         freq->localfile = -1;
1329
1330         process_http_object_request(freq);
1331
1332         if (freq->http_code == 416) {
1333                 warning("requested range invalid; we may already have all the data.");
1334         } else if (freq->curl_result != CURLE_OK) {
1335                 if (stat(freq->tmpfile, &st) == 0)
1336                         if (st.st_size == 0)
1337                                 unlink_or_warn(freq->tmpfile);
1338                 return -1;
1339         }
1340
1341         git_inflate_end(&freq->stream);
1342         git_SHA1_Final(freq->real_sha1, &freq->c);
1343         if (freq->zret != Z_STREAM_END) {
1344                 unlink_or_warn(freq->tmpfile);
1345                 return -1;
1346         }
1347         if (hashcmp(freq->sha1, freq->real_sha1)) {
1348                 unlink_or_warn(freq->tmpfile);
1349                 return -1;
1350         }
1351         freq->rename =
1352                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1353
1354         return freq->rename;
1355 }
1356
1357 void abort_http_object_request(struct http_object_request *freq)
1358 {
1359         unlink_or_warn(freq->tmpfile);
1360
1361         release_http_object_request(freq);
1362 }
1363
1364 void release_http_object_request(struct http_object_request *freq)
1365 {
1366         if (freq->localfile != -1) {
1367                 close(freq->localfile);
1368                 freq->localfile = -1;
1369         }
1370         if (freq->url != NULL) {
1371                 free(freq->url);
1372                 freq->url = NULL;
1373         }
1374         if (freq->slot != NULL) {
1375                 freq->slot->callback_func = NULL;
1376                 freq->slot->callback_data = NULL;
1377                 release_active_slot(freq->slot);
1378                 freq->slot = NULL;
1379         }
1380 }