git.oblomov.eu Git - git/blob - http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4 #include "run-command.h"
   5 #include "url.h"
   6
   7 int data_received;
   8 int active_requests;
   9 int http_is_verbose;
  10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  11
  12 #if LIBCURL_VERSION_NUM >= 0x070a06
  13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  14 #endif
  15
  16 static int min_curl_sessions = 1;
  17 static int curl_session_count;
  18 #ifdef USE_CURL_MULTI
  19 static int max_requests = -1;
  20 static CURLM *curlm;
  21 #endif
  22 #ifndef NO_CURL_EASY_DUPHANDLE
  23 static CURL *curl_default;
  24 #endif
  25
  26 #define PREV_BUF_SIZE 4096
  27 #define RANGE_HEADER_SIZE 30
  28
  29 char curl_errorstr[CURL_ERROR_SIZE];
  30
  31 static int curl_ssl_verify = -1;
  32 static const char *ssl_cert;
  33 #if LIBCURL_VERSION_NUM >= 0x070903
  34 static const char *ssl_key;
  35 #endif
  36 #if LIBCURL_VERSION_NUM >= 0x070908
  37 static const char *ssl_capath;
  38 #endif
  39 static const char *ssl_cainfo;
  40 static long curl_low_speed_limit = -1;
  41 static long curl_low_speed_time = -1;
  42 static int curl_ftp_no_epsv;
  43 static const char *curl_http_proxy;
  44 static const char *curl_cookie_file;
  45 static char *user_name, *user_pass, *description;
  46 static int http_proactive_auth;
  47 static const char *user_agent;
  48
  49 #if LIBCURL_VERSION_NUM >= 0x071700
  50 /* Use CURLOPT_KEYPASSWD as is */
  51 #elif LIBCURL_VERSION_NUM >= 0x070903
  52 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  53 #else
  54 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  55 #endif
  56
  57 static char *ssl_cert_password;
  58 static int ssl_cert_password_required;
  59
  60 static struct curl_slist *pragma_header;
  61 static struct curl_slist *no_pragma_header;
  62
  63 static struct active_request_slot *active_queue_head;
  64
  65 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  66 {
  67         size_t size = eltsize * nmemb;
  68         struct buffer *buffer = buffer_;
  69
  70         if (size > buffer->buf.len - buffer->posn)
  71                 size = buffer->buf.len - buffer->posn;
  72         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  73         buffer->posn += size;
  74
  75         return size;
  76 }
  77
  78 #ifndef NO_CURL_IOCTL
  79 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  80 {
  81         struct buffer *buffer = clientp;
  82
  83         switch (cmd) {
  84         case CURLIOCMD_NOP:
  85                 return CURLIOE_OK;
  86
  87         case CURLIOCMD_RESTARTREAD:
  88                 buffer->posn = 0;
  89                 return CURLIOE_OK;
  90
  91         default:
  92                 return CURLIOE_UNKNOWNCMD;
  93         }
  94 }
  95 #endif
  96
  97 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  98 {
  99         size_t size = eltsize * nmemb;
 100         struct strbuf *buffer = buffer_;
 101
 102         strbuf_add(buffer, ptr, size);
 103         data_received++;
 104         return size;
 105 }
 106
 107 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 108 {
 109         data_received++;
 110         return eltsize * nmemb;
 111 }
 112
 113 #ifdef USE_CURL_MULTI
 114 static void process_curl_messages(void)
 115 {
 116         int num_messages;
 117         struct active_request_slot *slot;
 118         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 119
 120         while (curl_message != NULL) {
 121                 if (curl_message->msg == CURLMSG_DONE) {
 122                         int curl_result = curl_message->data.result;
 123                         slot = active_queue_head;
 124                         while (slot != NULL &&
 125                                slot->curl != curl_message->easy_handle)
 126                                 slot = slot->next;
 127                         if (slot != NULL) {
 128                                 curl_multi_remove_handle(curlm, slot->curl);
 129                                 slot->curl_result = curl_result;
 130                                 finish_active_slot(slot);
 131                         } else {
 132                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 133                         }
 134                 } else {
 135                         fprintf(stderr, "Unknown CURL message received: %d\n",
 136                                 (int)curl_message->msg);
 137                 }
 138                 curl_message = curl_multi_info_read(curlm, &num_messages);
 139         }
 140 }
 141 #endif
 142
 143 static char *git_getpass_with_description(const char *what, const char *desc)
 144 {
 145         struct strbuf prompt = STRBUF_INIT;
 146         char *r;
 147
 148         if (desc)
 149                 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
 150         else
 151                 strbuf_addf(&prompt, "%s: ", what);
 152         /*
 153          * NEEDSWORK: for usernames, we should do something less magical that
 154          * actually echoes the characters. However, we need to read from
 155          * /dev/tty and not stdio, which is not portable (but getpass will do
 156          * it for us). http.c uses the same workaround.
 157          */
 158         r = git_getpass(prompt.buf);
 159
 160         strbuf_release(&prompt);
 161         return xstrdup(r);
 162 }
 163
 164 static int http_options(const char *var, const char *value, void *cb)
 165 {
 166         if (!strcmp("http.sslverify", var)) {
 167                 curl_ssl_verify = git_config_bool(var, value);
 168                 return 0;
 169         }
 170         if (!strcmp("http.sslcert", var))
 171                 return git_config_string(&ssl_cert, var, value);
 172 #if LIBCURL_VERSION_NUM >= 0x070903
 173         if (!strcmp("http.sslkey", var))
 174                 return git_config_string(&ssl_key, var, value);
 175 #endif
 176 #if LIBCURL_VERSION_NUM >= 0x070908
 177         if (!strcmp("http.sslcapath", var))
 178                 return git_config_string(&ssl_capath, var, value);
 179 #endif
 180         if (!strcmp("http.sslcainfo", var))
 181                 return git_config_string(&ssl_cainfo, var, value);
 182         if (!strcmp("http.sslcertpasswordprotected", var)) {
 183                 if (git_config_bool(var, value))
 184                         ssl_cert_password_required = 1;
 185                 return 0;
 186         }
 187         if (!strcmp("http.minsessions", var)) {
 188                 min_curl_sessions = git_config_int(var, value);
 189 #ifndef USE_CURL_MULTI
 190                 if (min_curl_sessions > 1)
 191                         min_curl_sessions = 1;
 192 #endif
 193                 return 0;
 194         }
 195 #ifdef USE_CURL_MULTI
 196         if (!strcmp("http.maxrequests", var)) {
 197                 max_requests = git_config_int(var, value);
 198                 return 0;
 199         }
 200 #endif
 201         if (!strcmp("http.lowspeedlimit", var)) {
 202                 curl_low_speed_limit = (long)git_config_int(var, value);
 203                 return 0;
 204         }
 205         if (!strcmp("http.lowspeedtime", var)) {
 206                 curl_low_speed_time = (long)git_config_int(var, value);
 207                 return 0;
 208         }
 209
 210         if (!strcmp("http.noepsv", var)) {
 211                 curl_ftp_no_epsv = git_config_bool(var, value);
 212                 return 0;
 213         }
 214         if (!strcmp("http.proxy", var))
 215                 return git_config_string(&curl_http_proxy, var, value);
 216
 217         if (!strcmp("http.cookiefile", var))
 218                 return git_config_string(&curl_cookie_file, var, value);
 219
 220         if (!strcmp("http.postbuffer", var)) {
 221                 http_post_buffer = git_config_int(var, value);
 222                 if (http_post_buffer < LARGE_PACKET_MAX)
 223                         http_post_buffer = LARGE_PACKET_MAX;
 224                 return 0;
 225         }
 226
 227         if (!strcmp("http.useragent", var))
 228                 return git_config_string(&user_agent, var, value);
 229
 230         /* Fall back on the default ones */
 231         return git_default_config(var, value, cb);
 232 }
 233
 234 static void init_curl_http_auth(CURL *result)
 235 {
 236         if (user_name) {
 237                 struct strbuf up = STRBUF_INIT;
 238                 if (!user_pass)
 239                         user_pass = xstrdup(git_getpass_with_description("Password", description));
 240                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 241                 curl_easy_setopt(result, CURLOPT_USERPWD,
 242                                  strbuf_detach(&up, NULL));
 243         }
 244 }
 245
 246 static int has_cert_password(void)
 247 {
 248         if (ssl_cert_password != NULL)
 249                 return 1;
 250         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 251                 return 0;
 252         /* Only prompt the user once. */
 253         ssl_cert_password_required = -1;
 254         ssl_cert_password = git_getpass_with_description("Certificate Password", description);
 255         if (ssl_cert_password != NULL) {
 256                 ssl_cert_password = xstrdup(ssl_cert_password);
 257                 return 1;
 258         } else
 259                 return 0;
 260 }
 261
 262 static CURL *get_curl_handle(void)
 263 {
 264         CURL *result = curl_easy_init();
 265
 266         if (!curl_ssl_verify) {
 267                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 268                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 269         } else {
 270                 /* Verify authenticity of the peer's certificate */
 271                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 272                 /* The name in the cert must match whom we tried to connect */
 273                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 274         }
 275
 276 #if LIBCURL_VERSION_NUM >= 0x070907
 277         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 278 #endif
 279 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 280         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 281 #endif
 282
 283         if (http_proactive_auth)
 284                 init_curl_http_auth(result);
 285
 286         if (ssl_cert != NULL)
 287                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 288         if (has_cert_password())
 289                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 290 #if LIBCURL_VERSION_NUM >= 0x070903
 291         if (ssl_key != NULL)
 292                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 293 #endif
 294 #if LIBCURL_VERSION_NUM >= 0x070908
 295         if (ssl_capath != NULL)
 296                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 297 #endif
 298         if (ssl_cainfo != NULL)
 299                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 300         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 301
 302         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 303                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 304                                  curl_low_speed_limit);
 305                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 306                                  curl_low_speed_time);
 307         }
 308
 309         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 310 #if LIBCURL_VERSION_NUM >= 0x071301
 311         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 312 #elif LIBCURL_VERSION_NUM >= 0x071101
 313         curl_easy_setopt(result, CURLOPT_POST301, 1);
 314 #endif
 315
 316         if (getenv("GIT_CURL_VERBOSE"))
 317                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 318
 319         curl_easy_setopt(result, CURLOPT_USERAGENT,
 320                 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
 321
 322         if (curl_ftp_no_epsv)
 323                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 324
 325         if (curl_http_proxy)
 326                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 327
 328         return result;
 329 }
 330
 331 static void http_auth_init(const char *url)
 332 {
 333         const char *at, *colon, *cp, *slash, *host;
 334
 335         cp = strstr(url, "://");
 336         if (!cp)
 337                 return;
 338
 339         /*
 340          * Ok, the URL looks like "proto://something".  Which one?
 341          * "proto://<user>:<pass>@<host>/...",
 342          * "proto://<user>@<host>/...", or just
 343          * "proto://<host>/..."?
 344          */
 345         cp += 3;
 346         at = strchr(cp, '@');
 347         colon = strchr(cp, ':');
 348         slash = strchrnul(cp, '/');
 349         if (!at || slash <= at) {
 350                 /* No credentials, but we may have to ask for some later */
 351                 host = cp;
 352         }
 353         else if (!colon || at <= colon) {
 354                 /* Only username */
 355                 user_name = url_decode_mem(cp, at - cp);
 356                 user_pass = NULL;
 357                 host = at + 1;
 358         } else {
 359                 user_name = url_decode_mem(cp, colon - cp);
 360                 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
 361                 host = at + 1;
 362         }
 363
 364         description = url_decode_mem(host, slash - host);
 365 }
 366
 367 static void set_from_env(const char **var, const char *envname)
 368 {
 369         const char *val = getenv(envname);
 370         if (val)
 371                 *var = val;
 372 }
 373
 374 void http_init(struct remote *remote, const char *url, int proactive_auth)
 375 {
 376         char *low_speed_limit;
 377         char *low_speed_time;
 378
 379         http_is_verbose = 0;
 380
 381         git_config(http_options, NULL);
 382
 383         curl_global_init(CURL_GLOBAL_ALL);
 384
 385         http_proactive_auth = proactive_auth;
 386
 387         if (remote && remote->http_proxy)
 388                 curl_http_proxy = xstrdup(remote->http_proxy);
 389
 390         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 391         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 392
 393 #ifdef USE_CURL_MULTI
 394         {
 395                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 396                 if (http_max_requests != NULL)
 397                         max_requests = atoi(http_max_requests);
 398         }
 399
 400         curlm = curl_multi_init();
 401         if (curlm == NULL) {
 402                 fprintf(stderr, "Error creating curl multi handle.\n");
 403                 exit(1);
 404         }
 405 #endif
 406
 407         if (getenv("GIT_SSL_NO_VERIFY"))
 408                 curl_ssl_verify = 0;
 409
 410         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 411 #if LIBCURL_VERSION_NUM >= 0x070903
 412         set_from_env(&ssl_key, "GIT_SSL_KEY");
 413 #endif
 414 #if LIBCURL_VERSION_NUM >= 0x070908
 415         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 416 #endif
 417         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 418
 419         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 420
 421         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 422         if (low_speed_limit != NULL)
 423                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 424         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 425         if (low_speed_time != NULL)
 426                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 427
 428         if (curl_ssl_verify == -1)
 429                 curl_ssl_verify = 1;
 430
 431         curl_session_count = 0;
 432 #ifdef USE_CURL_MULTI
 433         if (max_requests < 1)
 434                 max_requests = DEFAULT_MAX_REQUESTS;
 435 #endif
 436
 437         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 438                 curl_ftp_no_epsv = 1;
 439
 440         if (url) {
 441                 http_auth_init(url);
 442                 if (!ssl_cert_password_required &&
 443                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 444                     !prefixcmp(url, "https://"))
 445                         ssl_cert_password_required = 1;
 446         }
 447
 448 #ifndef NO_CURL_EASY_DUPHANDLE
 449         curl_default = get_curl_handle();
 450 #endif
 451 }
 452
 453 void http_cleanup(void)
 454 {
 455         struct active_request_slot *slot = active_queue_head;
 456
 457         while (slot != NULL) {
 458                 struct active_request_slot *next = slot->next;
 459                 if (slot->curl != NULL) {
 460 #ifdef USE_CURL_MULTI
 461                         curl_multi_remove_handle(curlm, slot->curl);
 462 #endif
 463                         curl_easy_cleanup(slot->curl);
 464                 }
 465                 free(slot);
 466                 slot = next;
 467         }
 468         active_queue_head = NULL;
 469
 470 #ifndef NO_CURL_EASY_DUPHANDLE
 471         curl_easy_cleanup(curl_default);
 472 #endif
 473
 474 #ifdef USE_CURL_MULTI
 475         curl_multi_cleanup(curlm);
 476 #endif
 477         curl_global_cleanup();
 478
 479         curl_slist_free_all(pragma_header);
 480         pragma_header = NULL;
 481
 482         curl_slist_free_all(no_pragma_header);
 483         no_pragma_header = NULL;
 484
 485         if (curl_http_proxy) {
 486                 free((void *)curl_http_proxy);
 487                 curl_http_proxy = NULL;
 488         }
 489
 490         if (ssl_cert_password != NULL) {
 491                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 492                 free(ssl_cert_password);
 493                 ssl_cert_password = NULL;
 494         }
 495         ssl_cert_password_required = 0;
 496 }
 497
 498 struct active_request_slot *get_active_slot(void)
 499 {
 500         struct active_request_slot *slot = active_queue_head;
 501         struct active_request_slot *newslot;
 502
 503 #ifdef USE_CURL_MULTI
 504         int num_transfers;
 505
 506         /* Wait for a slot to open up if the queue is full */
 507         while (active_requests >= max_requests) {
 508                 curl_multi_perform(curlm, &num_transfers);
 509                 if (num_transfers < active_requests)
 510                         process_curl_messages();
 511         }
 512 #endif
 513
 514         while (slot != NULL && slot->in_use)
 515                 slot = slot->next;
 516
 517         if (slot == NULL) {
 518                 newslot = xmalloc(sizeof(*newslot));
 519                 newslot->curl = NULL;
 520                 newslot->in_use = 0;
 521                 newslot->next = NULL;
 522
 523                 slot = active_queue_head;
 524                 if (slot == NULL) {
 525                         active_queue_head = newslot;
 526                 } else {
 527                         while (slot->next != NULL)
 528                                 slot = slot->next;
 529                         slot->next = newslot;
 530                 }
 531                 slot = newslot;
 532         }
 533
 534         if (slot->curl == NULL) {
 535 #ifdef NO_CURL_EASY_DUPHANDLE
 536                 slot->curl = get_curl_handle();
 537 #else
 538                 slot->curl = curl_easy_duphandle(curl_default);
 539 #endif
 540                 curl_session_count++;
 541         }
 542
 543         active_requests++;
 544         slot->in_use = 1;
 545         slot->local = NULL;
 546         slot->results = NULL;
 547         slot->finished = NULL;
 548         slot->callback_data = NULL;
 549         slot->callback_func = NULL;
 550         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 551         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 552         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 553         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 554         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 555         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 556         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 557         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 558         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 559
 560         return slot;
 561 }
 562
 563 int start_active_slot(struct active_request_slot *slot)
 564 {
 565 #ifdef USE_CURL_MULTI
 566         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 567         int num_transfers;
 568
 569         if (curlm_result != CURLM_OK &&
 570             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 571                 active_requests--;
 572                 slot->in_use = 0;
 573                 return 0;
 574         }
 575
 576         /*
 577          * We know there must be something to do, since we just added
 578          * something.
 579          */
 580         curl_multi_perform(curlm, &num_transfers);
 581 #endif
 582         return 1;
 583 }
 584
 585 #ifdef USE_CURL_MULTI
 586 struct fill_chain {
 587         void *data;
 588         int (*fill)(void *);
 589         struct fill_chain *next;
 590 };
 591
 592 static struct fill_chain *fill_cfg;
 593
 594 void add_fill_function(void *data, int (*fill)(void *))
 595 {
 596         struct fill_chain *new = xmalloc(sizeof(*new));
 597         struct fill_chain **linkp = &fill_cfg;
 598         new->data = data;
 599         new->fill = fill;
 600         new->next = NULL;
 601         while (*linkp)
 602                 linkp = &(*linkp)->next;
 603         *linkp = new;
 604 }
 605
 606 void fill_active_slots(void)
 607 {
 608         struct active_request_slot *slot = active_queue_head;
 609
 610         while (active_requests < max_requests) {
 611                 struct fill_chain *fill;
 612                 for (fill = fill_cfg; fill; fill = fill->next)
 613                         if (fill->fill(fill->data))
 614                                 break;
 615
 616                 if (!fill)
 617                         break;
 618         }
 619
 620         while (slot != NULL) {
 621                 if (!slot->in_use && slot->curl != NULL
 622                         && curl_session_count > min_curl_sessions) {
 623                         curl_easy_cleanup(slot->curl);
 624                         slot->curl = NULL;
 625                         curl_session_count--;
 626                 }
 627                 slot = slot->next;
 628         }
 629 }
 630
 631 void step_active_slots(void)
 632 {
 633         int num_transfers;
 634         CURLMcode curlm_result;
 635
 636         do {
 637                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 638         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 639         if (num_transfers < active_requests) {
 640                 process_curl_messages();
 641                 fill_active_slots();
 642         }
 643 }
 644 #endif
 645
 646 void run_active_slot(struct active_request_slot *slot)
 647 {
 648 #ifdef USE_CURL_MULTI
 649         long last_pos = 0;
 650         long current_pos;
 651         fd_set readfds;
 652         fd_set writefds;
 653         fd_set excfds;
 654         int max_fd;
 655         struct timeval select_timeout;
 656         int finished = 0;
 657
 658         slot->finished = &finished;
 659         while (!finished) {
 660                 data_received = 0;
 661                 step_active_slots();
 662
 663                 if (!data_received && slot->local != NULL) {
 664                         current_pos = ftell(slot->local);
 665                         if (current_pos > last_pos)
 666                                 data_received++;
 667                         last_pos = current_pos;
 668                 }
 669
 670                 if (slot->in_use && !data_received) {
 671                         max_fd = 0;
 672                         FD_ZERO(&readfds);
 673                         FD_ZERO(&writefds);
 674                         FD_ZERO(&excfds);
 675                         select_timeout.tv_sec = 0;
 676                         select_timeout.tv_usec = 50000;
 677                         select(max_fd, &readfds, &writefds,
 678                                &excfds, &select_timeout);
 679                 }
 680         }
 681 #else
 682         while (slot->in_use) {
 683                 slot->curl_result = curl_easy_perform(slot->curl);
 684                 finish_active_slot(slot);
 685         }
 686 #endif
 687 }
 688
 689 static void closedown_active_slot(struct active_request_slot *slot)
 690 {
 691         active_requests--;
 692         slot->in_use = 0;
 693 }
 694
 695 static void release_active_slot(struct active_request_slot *slot)
 696 {
 697         closedown_active_slot(slot);
 698         if (slot->curl && curl_session_count > min_curl_sessions) {
 699 #ifdef USE_CURL_MULTI
 700                 curl_multi_remove_handle(curlm, slot->curl);
 701 #endif
 702                 curl_easy_cleanup(slot->curl);
 703                 slot->curl = NULL;
 704                 curl_session_count--;
 705         }
 706 #ifdef USE_CURL_MULTI
 707         fill_active_slots();
 708 #endif
 709 }
 710
 711 void finish_active_slot(struct active_request_slot *slot)
 712 {
 713         closedown_active_slot(slot);
 714         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 715
 716         if (slot->finished != NULL)
 717                 (*slot->finished) = 1;
 718
 719         /* Store slot results so they can be read after the slot is reused */
 720         if (slot->results != NULL) {
 721                 slot->results->curl_result = slot->curl_result;
 722                 slot->results->http_code = slot->http_code;
 723         }
 724
 725         /* Run callback if appropriate */
 726         if (slot->callback_func != NULL)
 727                 slot->callback_func(slot->callback_data);
 728 }
 729
 730 void finish_all_active_slots(void)
 731 {
 732         struct active_request_slot *slot = active_queue_head;
 733
 734         while (slot != NULL)
 735                 if (slot->in_use) {
 736                         run_active_slot(slot);
 737                         slot = active_queue_head;
 738                 } else {
 739                         slot = slot->next;
 740                 }
 741 }
 742
 743 /* Helpers for modifying and creating URLs */
 744 static inline int needs_quote(int ch)
 745 {
 746         if (((ch >= 'A') && (ch <= 'Z'))
 747                         || ((ch >= 'a') && (ch <= 'z'))
 748                         || ((ch >= '0') && (ch <= '9'))
 749                         || (ch == '/')
 750                         || (ch == '-')
 751                         || (ch == '.'))
 752                 return 0;
 753         return 1;
 754 }
 755
 756 static char *quote_ref_url(const char *base, const char *ref)
 757 {
 758         struct strbuf buf = STRBUF_INIT;
 759         const char *cp;
 760         int ch;
 761
 762         end_url_with_slash(&buf, base);
 763
 764         for (cp = ref; (ch = *cp) != 0; cp++)
 765                 if (needs_quote(ch))
 766                         strbuf_addf(&buf, "%%%02x", ch);
 767                 else
 768                         strbuf_addch(&buf, *cp);
 769
 770         return strbuf_detach(&buf, NULL);
 771 }
 772
 773 void append_remote_object_url(struct strbuf *buf, const char *url,
 774                               const char *hex,
 775                               int only_two_digit_prefix)
 776 {
 777         end_url_with_slash(buf, url);
 778
 779         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 780         if (!only_two_digit_prefix)
 781                 strbuf_addf(buf, "%s", hex+2);
 782 }
 783
 784 char *get_remote_object_url(const char *url, const char *hex,
 785                             int only_two_digit_prefix)
 786 {
 787         struct strbuf buf = STRBUF_INIT;
 788         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 789         return strbuf_detach(&buf, NULL);
 790 }
 791
 792 /* http_request() targets */
 793 #define HTTP_REQUEST_STRBUF     0
 794 #define HTTP_REQUEST_FILE       1
 795
 796 static int http_request(const char *url, void *result, int target, int options)
 797 {
 798         struct active_request_slot *slot;
 799         struct slot_results results;
 800         struct curl_slist *headers = NULL;
 801         struct strbuf buf = STRBUF_INIT;
 802         int ret;
 803
 804         slot = get_active_slot();
 805         slot->results = &results;
 806         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 807
 808         if (result == NULL) {
 809                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 810         } else {
 811                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 812                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 813
 814                 if (target == HTTP_REQUEST_FILE) {
 815                         long posn = ftell(result);
 816                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 817                                          fwrite);
 818                         if (posn > 0) {
 819                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 820                                 headers = curl_slist_append(headers, buf.buf);
 821                                 strbuf_reset(&buf);
 822                         }
 823                         slot->local = result;
 824                 } else
 825                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 826                                          fwrite_buffer);
 827         }
 828
 829         strbuf_addstr(&buf, "Pragma:");
 830         if (options & HTTP_NO_CACHE)
 831                 strbuf_addstr(&buf, " no-cache");
 832
 833         headers = curl_slist_append(headers, buf.buf);
 834
 835         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 836         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 837
 838         if (start_active_slot(slot)) {
 839                 run_active_slot(slot);
 840                 if (results.curl_result == CURLE_OK)
 841                         ret = HTTP_OK;
 842                 else if (missing_target(&results))
 843                         ret = HTTP_MISSING_TARGET;
 844                 else if (results.http_code == 401) {
 845                         if (user_name && user_pass) {
 846                                 ret = HTTP_NOAUTH;
 847                         } else {
 848                                 /*
 849                                  * git_getpass is needed here because its very likely stdin/stdout are
 850                                  * pipes to our parent process.  So we instead need to use /dev/tty,
 851                                  * but that is non-portable.  Using git_getpass() can at least be stubbed
 852                                  * on other platforms with a different implementation if/when necessary.
 853                                  */
 854                                 if (!user_name)
 855                                         user_name = xstrdup(git_getpass_with_description("Username", description));
 856                                 init_curl_http_auth(slot->curl);
 857                                 ret = HTTP_REAUTH;
 858                         }
 859                 } else {
 860                         if (!curl_errorstr[0])
 861                                 strlcpy(curl_errorstr,
 862                                         curl_easy_strerror(results.curl_result),
 863                                         sizeof(curl_errorstr));
 864                         ret = HTTP_ERROR;
 865                 }
 866         } else {
 867                 error("Unable to start HTTP request for %s", url);
 868                 ret = HTTP_START_FAILED;
 869         }
 870
 871         slot->local = NULL;
 872         curl_slist_free_all(headers);
 873         strbuf_release(&buf);
 874
 875         return ret;
 876 }
 877
 878 static int http_request_reauth(const char *url, void *result, int target,
 879                                int options)
 880 {
 881         int ret = http_request(url, result, target, options);
 882         if (ret != HTTP_REAUTH)
 883                 return ret;
 884         return http_request(url, result, target, options);
 885 }
 886
 887 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 888 {
 889         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
 890 }
 891
 892 /*
 893  * Downloads an url and stores the result in the given file.
 894  *
 895  * If a previous interrupted download is detected (i.e. a previous temporary
 896  * file is still around) the download is resumed.
 897  */
 898 static int http_get_file(const char *url, const char *filename, int options)
 899 {
 900         int ret;
 901         struct strbuf tmpfile = STRBUF_INIT;
 902         FILE *result;
 903
 904         strbuf_addf(&tmpfile, "%s.temp", filename);
 905         result = fopen(tmpfile.buf, "a");
 906         if (! result) {
 907                 error("Unable to open local file %s", tmpfile.buf);
 908                 ret = HTTP_ERROR;
 909                 goto cleanup;
 910         }
 911
 912         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
 913         fclose(result);
 914
 915         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 916                 ret = HTTP_ERROR;
 917 cleanup:
 918         strbuf_release(&tmpfile);
 919         return ret;
 920 }
 921
 922 int http_error(const char *url, int ret)
 923 {
 924         /* http_request has already handled HTTP_START_FAILED. */
 925         if (ret != HTTP_START_FAILED)
 926                 error("%s while accessing %s", curl_errorstr, url);
 927
 928         return ret;
 929 }
 930
 931 int http_fetch_ref(const char *base, struct ref *ref)
 932 {
 933         char *url;
 934         struct strbuf buffer = STRBUF_INIT;
 935         int ret = -1;
 936
 937         url = quote_ref_url(base, ref->name);
 938         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 939                 strbuf_rtrim(&buffer);
 940                 if (buffer.len == 40)
 941                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 942                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 943                         ref->symref = xstrdup(buffer.buf + 5);
 944                         ret = 0;
 945                 }
 946         }
 947
 948         strbuf_release(&buffer);
 949         free(url);
 950         return ret;
 951 }
 952
 953 /* Helpers for fetching packs */
 954 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
 955 {
 956         char *url, *tmp;
 957         struct strbuf buf = STRBUF_INIT;
 958
 959         if (http_is_verbose)
 960                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
 961
 962         end_url_with_slash(&buf, base_url);
 963         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
 964         url = strbuf_detach(&buf, NULL);
 965
 966         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
 967         tmp = strbuf_detach(&buf, NULL);
 968
 969         if (http_get_file(url, tmp, 0) != HTTP_OK) {
 970                 error("Unable to get pack index %s\n", url);
 971                 free(tmp);
 972                 tmp = NULL;
 973         }
 974
 975         free(url);
 976         return tmp;
 977 }
 978
 979 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 980         unsigned char *sha1, const char *base_url)
 981 {
 982         struct packed_git *new_pack;
 983         char *tmp_idx = NULL;
 984         int ret;
 985
 986         if (has_pack_index(sha1)) {
 987                 new_pack = parse_pack_index(sha1, NULL);
 988                 if (!new_pack)
 989                         return -1; /* parse_pack_index() already issued error message */
 990                 goto add_pack;
 991         }
 992
 993         tmp_idx = fetch_pack_index(sha1, base_url);
 994         if (!tmp_idx)
 995                 return -1;
 996
 997         new_pack = parse_pack_index(sha1, tmp_idx);
 998         if (!new_pack) {
 999                 unlink(tmp_idx);
1000                 free(tmp_idx);
1001
1002                 return -1; /* parse_pack_index() already issued error message */
1003         }
1004
1005         ret = verify_pack_index(new_pack);
1006         if (!ret) {
1007                 close_pack_index(new_pack);
1008                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1009         }
1010         free(tmp_idx);
1011         if (ret)
1012                 return -1;
1013
1014 add_pack:
1015         new_pack->next = *packs_head;
1016         *packs_head = new_pack;
1017         return 0;
1018 }
1019
1020 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1021 {
1022         int ret = 0, i = 0;
1023         char *url, *data;
1024         struct strbuf buf = STRBUF_INIT;
1025         unsigned char sha1[20];
1026
1027         end_url_with_slash(&buf, base_url);
1028         strbuf_addstr(&buf, "objects/info/packs");
1029         url = strbuf_detach(&buf, NULL);
1030
1031         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1032         if (ret != HTTP_OK)
1033                 goto cleanup;
1034
1035         data = buf.buf;
1036         while (i < buf.len) {
1037                 switch (data[i]) {
1038                 case 'P':
1039                         i++;
1040                         if (i + 52 <= buf.len &&
1041                             !prefixcmp(data + i, " pack-") &&
1042                             !prefixcmp(data + i + 46, ".pack\n")) {
1043                                 get_sha1_hex(data + i + 6, sha1);
1044                                 fetch_and_setup_pack_index(packs_head, sha1,
1045                                                       base_url);
1046                                 i += 51;
1047                                 break;
1048                         }
1049                 default:
1050                         while (i < buf.len && data[i] != '\n')
1051                                 i++;
1052                 }
1053                 i++;
1054         }
1055
1056 cleanup:
1057         free(url);
1058         return ret;
1059 }
1060
1061 void release_http_pack_request(struct http_pack_request *preq)
1062 {
1063         if (preq->packfile != NULL) {
1064                 fclose(preq->packfile);
1065                 preq->packfile = NULL;
1066                 preq->slot->local = NULL;
1067         }
1068         if (preq->range_header != NULL) {
1069                 curl_slist_free_all(preq->range_header);
1070                 preq->range_header = NULL;
1071         }
1072         preq->slot = NULL;
1073         free(preq->url);
1074 }
1075
1076 int finish_http_pack_request(struct http_pack_request *preq)
1077 {
1078         struct packed_git **lst;
1079         struct packed_git *p = preq->target;
1080         char *tmp_idx;
1081         struct child_process ip;
1082         const char *ip_argv[8];
1083
1084         close_pack_index(p);
1085
1086         fclose(preq->packfile);
1087         preq->packfile = NULL;
1088         preq->slot->local = NULL;
1089
1090         lst = preq->lst;
1091         while (*lst != p)
1092                 lst = &((*lst)->next);
1093         *lst = (*lst)->next;
1094
1095         tmp_idx = xstrdup(preq->tmpfile);
1096         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1097                ".idx.temp");
1098
1099         ip_argv[0] = "index-pack";
1100         ip_argv[1] = "-o";
1101         ip_argv[2] = tmp_idx;
1102         ip_argv[3] = preq->tmpfile;
1103         ip_argv[4] = NULL;
1104
1105         memset(&ip, 0, sizeof(ip));
1106         ip.argv = ip_argv;
1107         ip.git_cmd = 1;
1108         ip.no_stdin = 1;
1109         ip.no_stdout = 1;
1110
1111         if (run_command(&ip)) {
1112                 unlink(preq->tmpfile);
1113                 unlink(tmp_idx);
1114                 free(tmp_idx);
1115                 return -1;
1116         }
1117
1118         unlink(sha1_pack_index_name(p->sha1));
1119
1120         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1121          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1122                 free(tmp_idx);
1123                 return -1;
1124         }
1125
1126         install_packed_git(p);
1127         free(tmp_idx);
1128         return 0;
1129 }
1130
1131 struct http_pack_request *new_http_pack_request(
1132         struct packed_git *target, const char *base_url)
1133 {
1134         long prev_posn = 0;
1135         char range[RANGE_HEADER_SIZE];
1136         struct strbuf buf = STRBUF_INIT;
1137         struct http_pack_request *preq;
1138
1139         preq = xcalloc(1, sizeof(*preq));
1140         preq->target = target;
1141
1142         end_url_with_slash(&buf, base_url);
1143         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1144                 sha1_to_hex(target->sha1));
1145         preq->url = strbuf_detach(&buf, NULL);
1146
1147         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1148                 sha1_pack_name(target->sha1));
1149         preq->packfile = fopen(preq->tmpfile, "a");
1150         if (!preq->packfile) {
1151                 error("Unable to open local file %s for pack",
1152                       preq->tmpfile);
1153                 goto abort;
1154         }
1155
1156         preq->slot = get_active_slot();
1157         preq->slot->local = preq->packfile;
1158         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1159         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1160         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1161         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1162                 no_pragma_header);
1163
1164         /*
1165          * If there is data present from a previous transfer attempt,
1166          * resume where it left off
1167          */
1168         prev_posn = ftell(preq->packfile);
1169         if (prev_posn>0) {
1170                 if (http_is_verbose)
1171                         fprintf(stderr,
1172                                 "Resuming fetch of pack %s at byte %ld\n",
1173                                 sha1_to_hex(target->sha1), prev_posn);
1174                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1175                 preq->range_header = curl_slist_append(NULL, range);
1176                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1177                         preq->range_header);
1178         }
1179
1180         return preq;
1181
1182 abort:
1183         free(preq->url);
1184         free(preq);
1185         return NULL;
1186 }
1187
1188 /* Helpers for fetching objects (loose) */
1189 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1190                                void *data)
1191 {
1192         unsigned char expn[4096];
1193         size_t size = eltsize * nmemb;
1194         int posn = 0;
1195         struct http_object_request *freq =
1196                 (struct http_object_request *)data;
1197         do {
1198                 ssize_t retval = xwrite(freq->localfile,
1199                                         (char *) ptr + posn, size - posn);
1200                 if (retval < 0)
1201                         return posn;
1202                 posn += retval;
1203         } while (posn < size);
1204
1205         freq->stream.avail_in = size;
1206         freq->stream.next_in = (void *)ptr;
1207         do {
1208                 freq->stream.next_out = expn;
1209                 freq->stream.avail_out = sizeof(expn);
1210                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1211                 git_SHA1_Update(&freq->c, expn,
1212                                 sizeof(expn) - freq->stream.avail_out);
1213         } while (freq->stream.avail_in && freq->zret == Z_OK);
1214         data_received++;
1215         return size;
1216 }
1217
1218 struct http_object_request *new_http_object_request(const char *base_url,
1219         unsigned char *sha1)
1220 {
1221         char *hex = sha1_to_hex(sha1);
1222         char *filename;
1223         char prevfile[PATH_MAX];
1224         int prevlocal;
1225         char prev_buf[PREV_BUF_SIZE];
1226         ssize_t prev_read = 0;
1227         long prev_posn = 0;
1228         char range[RANGE_HEADER_SIZE];
1229         struct curl_slist *range_header = NULL;
1230         struct http_object_request *freq;
1231
1232         freq = xcalloc(1, sizeof(*freq));
1233         hashcpy(freq->sha1, sha1);
1234         freq->localfile = -1;
1235
1236         filename = sha1_file_name(sha1);
1237         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1238                  "%s.temp", filename);
1239
1240         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1241         unlink_or_warn(prevfile);
1242         rename(freq->tmpfile, prevfile);
1243         unlink_or_warn(freq->tmpfile);
1244
1245         if (freq->localfile != -1)
1246                 error("fd leakage in start: %d", freq->localfile);
1247         freq->localfile = open(freq->tmpfile,
1248                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1249         /*
1250          * This could have failed due to the "lazy directory creation";
1251          * try to mkdir the last path component.
1252          */
1253         if (freq->localfile < 0 && errno == ENOENT) {
1254                 char *dir = strrchr(freq->tmpfile, '/');
1255                 if (dir) {
1256                         *dir = 0;
1257                         mkdir(freq->tmpfile, 0777);
1258                         *dir = '/';
1259                 }
1260                 freq->localfile = open(freq->tmpfile,
1261                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1262         }
1263
1264         if (freq->localfile < 0) {
1265                 error("Couldn't create temporary file %s: %s",
1266                       freq->tmpfile, strerror(errno));
1267                 goto abort;
1268         }
1269
1270         git_inflate_init(&freq->stream);
1271
1272         git_SHA1_Init(&freq->c);
1273
1274         freq->url = get_remote_object_url(base_url, hex, 0);
1275
1276         /*
1277          * If a previous temp file is present, process what was already
1278          * fetched.
1279          */
1280         prevlocal = open(prevfile, O_RDONLY);
1281         if (prevlocal != -1) {
1282                 do {
1283                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1284                         if (prev_read>0) {
1285                                 if (fwrite_sha1_file(prev_buf,
1286                                                      1,
1287                                                      prev_read,
1288                                                      freq) == prev_read) {
1289                                         prev_posn += prev_read;
1290                                 } else {
1291                                         prev_read = -1;
1292                                 }
1293                         }
1294                 } while (prev_read > 0);
1295                 close(prevlocal);
1296         }
1297         unlink_or_warn(prevfile);
1298
1299         /*
1300          * Reset inflate/SHA1 if there was an error reading the previous temp
1301          * file; also rewind to the beginning of the local file.
1302          */
1303         if (prev_read == -1) {
1304                 memset(&freq->stream, 0, sizeof(freq->stream));
1305                 git_inflate_init(&freq->stream);
1306                 git_SHA1_Init(&freq->c);
1307                 if (prev_posn>0) {
1308                         prev_posn = 0;
1309                         lseek(freq->localfile, 0, SEEK_SET);
1310                         if (ftruncate(freq->localfile, 0) < 0) {
1311                                 error("Couldn't truncate temporary file %s: %s",
1312                                           freq->tmpfile, strerror(errno));
1313                                 goto abort;
1314                         }
1315                 }
1316         }
1317
1318         freq->slot = get_active_slot();
1319
1320         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1321         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1322         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1323         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1324         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1325
1326         /*
1327          * If we have successfully processed data from a previous fetch
1328          * attempt, only fetch the data we don't already have.
1329          */
1330         if (prev_posn>0) {
1331                 if (http_is_verbose)
1332                         fprintf(stderr,
1333                                 "Resuming fetch of object %s at byte %ld\n",
1334                                 hex, prev_posn);
1335                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1336                 range_header = curl_slist_append(range_header, range);
1337                 curl_easy_setopt(freq->slot->curl,
1338                                  CURLOPT_HTTPHEADER, range_header);
1339         }
1340
1341         return freq;
1342
1343 abort:
1344         free(freq->url);
1345         free(freq);
1346         return NULL;
1347 }
1348
1349 void process_http_object_request(struct http_object_request *freq)
1350 {
1351         if (freq->slot == NULL)
1352                 return;
1353         freq->curl_result = freq->slot->curl_result;
1354         freq->http_code = freq->slot->http_code;
1355         freq->slot = NULL;
1356 }
1357
1358 int finish_http_object_request(struct http_object_request *freq)
1359 {
1360         struct stat st;
1361
1362         close(freq->localfile);
1363         freq->localfile = -1;
1364
1365         process_http_object_request(freq);
1366
1367         if (freq->http_code == 416) {
1368                 warning("requested range invalid; we may already have all the data.");
1369         } else if (freq->curl_result != CURLE_OK) {
1370                 if (stat(freq->tmpfile, &st) == 0)
1371                         if (st.st_size == 0)
1372                                 unlink_or_warn(freq->tmpfile);
1373                 return -1;
1374         }
1375
1376         git_inflate_end(&freq->stream);
1377         git_SHA1_Final(freq->real_sha1, &freq->c);
1378         if (freq->zret != Z_STREAM_END) {
1379                 unlink_or_warn(freq->tmpfile);
1380                 return -1;
1381         }
1382         if (hashcmp(freq->sha1, freq->real_sha1)) {
1383                 unlink_or_warn(freq->tmpfile);
1384                 return -1;
1385         }
1386         freq->rename =
1387                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1388
1389         return freq->rename;
1390 }
1391
1392 void abort_http_object_request(struct http_object_request *freq)
1393 {
1394         unlink_or_warn(freq->tmpfile);
1395
1396         release_http_object_request(freq);
1397 }
1398
1399 void release_http_object_request(struct http_object_request *freq)
1400 {
1401         if (freq->localfile != -1) {
1402                 close(freq->localfile);
1403                 freq->localfile = -1;
1404         }
1405         if (freq->url != NULL) {
1406                 free(freq->url);
1407                 freq->url = NULL;
1408         }
1409         if (freq->slot != NULL) {
1410                 freq->slot->callback_func = NULL;
1411                 freq->slot->callback_data = NULL;
1412                 release_active_slot(freq->slot);
1413                 freq->slot = NULL;
1414         }
1415 }