http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5 #include "tag.h"
   6 #include "blob.h"
   7
   8 #include <curl/curl.h>
   9 #include <curl/easy.h>
  10 #include <expat.h>
  11
  12 static const char http_push_usage[] =
  13 "git-http-push [--complete] [--force] [--verbose] <url> <ref> [<ref>...]\n";
  14
  15 #if LIBCURL_VERSION_NUM >= 0x070908
  16 #define USE_CURL_MULTI
  17 #define DEFAULT_MAX_REQUESTS 5
  18 #endif
  19
  20 #if LIBCURL_VERSION_NUM < 0x070704
  21 #define curl_global_cleanup() do { /* nothing */ } while(0)
  22 #endif
  23 #if LIBCURL_VERSION_NUM < 0x070800
  24 #define curl_global_init(a) do { /* nothing */ } while(0)
  25 #endif
  26
  27 #if LIBCURL_VERSION_NUM < 0x070c04
  28 #define NO_CURL_EASY_DUPHANDLE
  29 #endif
  30
  31 #define RANGE_HEADER_SIZE 30
  32
  33 /* DAV method names and request body templates */
  34 #define DAV_LOCK "LOCK"
  35 #define DAV_MKCOL "MKCOL"
  36 #define DAV_MOVE "MOVE"
  37 #define DAV_PROPFIND "PROPFIND"
  38 #define DAV_PUT "PUT"
  39 #define DAV_UNLOCK "UNLOCK"
  40 #define PROPFIND_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  41 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  42
  43 #define LOCK_TIME 600
  44 #define LOCK_REFRESH 30
  45
  46 static int active_requests = 0;
  47 static int data_received;
  48 static int pushing = 0;
  49 static int aborted = 0;
  50
  51 #ifdef USE_CURL_MULTI
  52 static int max_requests = -1;
  53 static CURLM *curlm;
  54 #endif
  55 #ifndef NO_CURL_EASY_DUPHANDLE
  56 static CURL *curl_default;
  57 #endif
  58 static struct curl_slist *no_pragma_header;
  59 static struct curl_slist *default_headers;
  60 static char curl_errorstr[CURL_ERROR_SIZE];
  61
  62 static int push_verbosely = 0;
  63 static int push_all = 0;
  64 static int force_all = 0;
  65
  66 struct buffer
  67 {
  68         size_t posn;
  69         size_t size;
  70         void *buffer;
  71 };
  72
  73 struct repo
  74 {
  75         char *url;
  76         struct packed_git *packs;
  77 };
  78
  79 static struct repo *remote = NULL;
  80
  81 enum transfer_state {
  82         NEED_CHECK,
  83         RUN_HEAD,
  84         NEED_PUSH,
  85         RUN_MKCOL,
  86         RUN_PUT,
  87         RUN_MOVE,
  88         ABORTED,
  89         COMPLETE,
  90 };
  91
  92 struct transfer_request
  93 {
  94         unsigned char sha1[20];
  95         char *url;
  96         char *dest;
  97         struct active_lock *lock;
  98         struct curl_slist *headers;
  99         struct buffer buffer;
 100         char filename[PATH_MAX];
 101         char tmpfile[PATH_MAX];
 102         enum transfer_state state;
 103         CURLcode curl_result;
 104         char errorstr[CURL_ERROR_SIZE];
 105         long http_code;
 106         unsigned char real_sha1[20];
 107         SHA_CTX c;
 108         z_stream stream;
 109         int zret;
 110         int rename;
 111         struct active_request_slot *slot;
 112         struct transfer_request *next;
 113 };
 114
 115 struct active_request_slot
 116 {
 117         CURL *curl;
 118         FILE *local;
 119         int in_use;
 120         int done;
 121         CURLcode curl_result;
 122         long http_code;
 123         struct active_request_slot *next;
 124 };
 125
 126 static struct transfer_request *request_queue_head = NULL;
 127 static struct active_request_slot *active_queue_head = NULL;
 128
 129 static int curl_ssl_verify = -1;
 130 static char *ssl_cert = NULL;
 131 #if LIBCURL_VERSION_NUM >= 0x070902
 132 static char *ssl_key = NULL;
 133 #endif
 134 #if LIBCURL_VERSION_NUM >= 0x070908
 135 static char *ssl_capath = NULL;
 136 #endif
 137 static char *ssl_cainfo = NULL;
 138 static long curl_low_speed_limit = -1;
 139 static long curl_low_speed_time = -1;
 140
 141 struct active_lock
 142 {
 143         int ctx_activelock;
 144         int ctx_owner;
 145         int ctx_owner_href;
 146         int ctx_timeout;
 147         int ctx_locktoken;
 148         int ctx_locktoken_href;
 149         char *url;
 150         char *owner;
 151         char *token;
 152         time_t start_time;
 153         long timeout;
 154         int refreshing;
 155 };
 156
 157 struct lockprop
 158 {
 159         int supported_lock;
 160         int lock_entry;
 161         int lock_scope;
 162         int lock_type;
 163         int lock_exclusive;
 164         int lock_exclusive_write;
 165 };
 166
 167 static int http_options(const char *var, const char *value)
 168 {
 169         if (!strcmp("http.sslverify", var)) {
 170                 if (curl_ssl_verify == -1) {
 171                         curl_ssl_verify = git_config_bool(var, value);
 172                 }
 173                 return 0;
 174         }
 175
 176         if (!strcmp("http.sslcert", var)) {
 177                 if (ssl_cert == NULL) {
 178                         ssl_cert = xmalloc(strlen(value)+1);
 179                         strcpy(ssl_cert, value);
 180                 }
 181                 return 0;
 182         }
 183 #if LIBCURL_VERSION_NUM >= 0x070902
 184         if (!strcmp("http.sslkey", var)) {
 185                 if (ssl_key == NULL) {
 186                         ssl_key = xmalloc(strlen(value)+1);
 187                         strcpy(ssl_key, value);
 188                 }
 189                 return 0;
 190         }
 191 #endif
 192 #if LIBCURL_VERSION_NUM >= 0x070908
 193         if (!strcmp("http.sslcapath", var)) {
 194                 if (ssl_capath == NULL) {
 195                         ssl_capath = xmalloc(strlen(value)+1);
 196                         strcpy(ssl_capath, value);
 197                 }
 198                 return 0;
 199         }
 200 #endif
 201         if (!strcmp("http.sslcainfo", var)) {
 202                 if (ssl_cainfo == NULL) {
 203                         ssl_cainfo = xmalloc(strlen(value)+1);
 204                         strcpy(ssl_cainfo, value);
 205                 }
 206                 return 0;
 207         }
 208
 209 #ifdef USE_CURL_MULTI
 210         if (!strcmp("http.maxrequests", var)) {
 211                 if (max_requests == -1)
 212                         max_requests = git_config_int(var, value);
 213                 return 0;
 214         }
 215 #endif
 216
 217         if (!strcmp("http.lowspeedlimit", var)) {
 218                 if (curl_low_speed_limit == -1)
 219                         curl_low_speed_limit = (long)git_config_int(var, value);
 220                 return 0;
 221         }
 222         if (!strcmp("http.lowspeedtime", var)) {
 223                 if (curl_low_speed_time == -1)
 224                         curl_low_speed_time = (long)git_config_int(var, value);
 225                 return 0;
 226         }
 227
 228         /* Fall back on the default ones */
 229         return git_default_config(var, value);
 230 }
 231
 232 static size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
 233                            struct buffer *buffer)
 234 {
 235         size_t size = eltsize * nmemb;
 236         if (size > buffer->size - buffer->posn)
 237                 size = buffer->size - buffer->posn;
 238         memcpy(ptr, buffer->buffer + buffer->posn, size);
 239         buffer->posn += size;
 240         return size;
 241 }
 242
 243 static size_t fwrite_buffer_dynamic(const void *ptr, size_t eltsize,
 244                                     size_t nmemb, struct buffer *buffer)
 245 {
 246         size_t size = eltsize * nmemb;
 247         if (size > buffer->size - buffer->posn) {
 248                 buffer->size = buffer->size * 3 / 2;
 249                 if (buffer->size < buffer->posn + size)
 250                         buffer->size = buffer->posn + size;
 251                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
 252         }
 253         memcpy(buffer->buffer + buffer->posn, ptr, size);
 254         buffer->posn += size;
 255         data_received++;
 256         return size;
 257 }
 258
 259 static size_t fwrite_null(const void *ptr, size_t eltsize,
 260                           size_t nmemb, struct buffer *buffer)
 261 {
 262         data_received++;
 263         return eltsize * nmemb;
 264 }
 265
 266 #ifdef USE_CURL_MULTI
 267 static void process_curl_messages(void);
 268 static void process_request_queue(void);
 269 #endif
 270
 271 static CURL* get_curl_handle(void)
 272 {
 273         CURL* result = curl_easy_init();
 274
 275         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 276 #if LIBCURL_VERSION_NUM >= 0x070907
 277         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 278 #endif
 279
 280         if (ssl_cert != NULL)
 281                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 282 #if LIBCURL_VERSION_NUM >= 0x070902
 283         if (ssl_key != NULL)
 284                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 285 #endif
 286 #if LIBCURL_VERSION_NUM >= 0x070908
 287         if (ssl_capath != NULL)
 288                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 289 #endif
 290         if (ssl_cainfo != NULL)
 291                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 292         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 293
 294         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 295                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 296                                  curl_low_speed_limit);
 297                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 298                                  curl_low_speed_time);
 299         }
 300
 301         return result;
 302 }
 303
 304 static struct active_request_slot *get_active_slot(void)
 305 {
 306         struct active_request_slot *slot = active_queue_head;
 307         struct active_request_slot *newslot;
 308
 309 #ifdef USE_CURL_MULTI
 310         int num_transfers;
 311
 312         /* Wait for a slot to open up if the queue is full */
 313         while (active_requests >= max_requests) {
 314                 curl_multi_perform(curlm, &num_transfers);
 315                 if (num_transfers < active_requests) {
 316                         process_curl_messages();
 317                 }
 318         }
 319 #endif
 320
 321         while (slot != NULL && slot->in_use) {
 322                 slot = slot->next;
 323         }
 324         if (slot == NULL) {
 325                 newslot = xmalloc(sizeof(*newslot));
 326                 newslot->curl = NULL;
 327                 newslot->in_use = 0;
 328                 newslot->next = NULL;
 329
 330                 slot = active_queue_head;
 331                 if (slot == NULL) {
 332                         active_queue_head = newslot;
 333                 } else {
 334                         while (slot->next != NULL) {
 335                                 slot = slot->next;
 336                         }
 337                         slot->next = newslot;
 338                 }
 339                 slot = newslot;
 340         }
 341
 342         if (slot->curl == NULL) {
 343 #ifdef NO_CURL_EASY_DUPHANDLE
 344                 slot->curl = get_curl_handle();
 345 #else
 346                 slot->curl = curl_easy_duphandle(curl_default);
 347 #endif
 348         }
 349
 350         active_requests++;
 351         slot->in_use = 1;
 352         slot->done = 0;
 353         slot->local = NULL;
 354         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, default_headers);
 355         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 356
 357         return slot;
 358 }
 359
 360 static int start_active_slot(struct active_request_slot *slot)
 361 {
 362 #ifdef USE_CURL_MULTI
 363         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 364
 365         if (curlm_result != CURLM_OK &&
 366             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 367                 active_requests--;
 368                 slot->in_use = 0;
 369                 return 0;
 370         }
 371 #endif
 372         return 1;
 373 }
 374
 375 static void run_active_slot(struct active_request_slot *slot)
 376 {
 377 #ifdef USE_CURL_MULTI
 378         int num_transfers;
 379         long last_pos = 0;
 380         long current_pos;
 381         fd_set readfds;
 382         fd_set writefds;
 383         fd_set excfds;
 384         int max_fd;
 385         struct timeval select_timeout;
 386         CURLMcode curlm_result;
 387
 388         while (!slot->done) {
 389                 data_received = 0;
 390                 do {
 391                         curlm_result = curl_multi_perform(curlm,
 392                                                           &num_transfers);
 393                 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 394                 if (num_transfers < active_requests) {
 395                         process_curl_messages();
 396                         process_request_queue();
 397                 }
 398
 399                 if (!data_received && slot->local != NULL) {
 400                         current_pos = ftell(slot->local);
 401                         if (current_pos > last_pos)
 402                                 data_received++;
 403                         last_pos = current_pos;
 404                 }
 405
 406                 if (!slot->done && !data_received) {
 407                         max_fd = 0;
 408                         FD_ZERO(&readfds);
 409                         FD_ZERO(&writefds);
 410                         FD_ZERO(&excfds);
 411                         select_timeout.tv_sec = 0;
 412                         select_timeout.tv_usec = 50000;
 413                         select(max_fd, &readfds, &writefds,
 414                                &excfds, &select_timeout);
 415                 }
 416         }
 417 #else
 418         slot->curl_result = curl_easy_perform(slot->curl);
 419         active_requests--;
 420 #endif
 421 }
 422
 423 static void start_check(struct transfer_request *request)
 424 {
 425         char *hex = sha1_to_hex(request->sha1);
 426         struct active_request_slot *slot;
 427         char *posn;
 428
 429         request->url = xmalloc(strlen(remote->url) + 55);
 430         strcpy(request->url, remote->url);
 431         posn = request->url + strlen(remote->url);
 432         strcpy(posn, "objects/");
 433         posn += 8;
 434         memcpy(posn, hex, 2);
 435         posn += 2;
 436         *(posn++) = '/';
 437         strcpy(posn, hex + 2);
 438
 439         slot = get_active_slot();
 440         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 441         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 442         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 443
 444         if (start_active_slot(slot)) {
 445                 request->slot = slot;
 446                 request->state = RUN_HEAD;
 447         } else {
 448                 request->state = ABORTED;
 449                 free(request->url);
 450         }
 451 }
 452
 453 static void start_mkcol(struct transfer_request *request)
 454 {
 455         char *hex = sha1_to_hex(request->sha1);
 456         struct active_request_slot *slot;
 457         char *posn;
 458
 459         request->url = xmalloc(strlen(remote->url) + 13);
 460         strcpy(request->url, remote->url);
 461         posn = request->url + strlen(remote->url);
 462         strcpy(posn, "objects/");
 463         posn += 8;
 464         memcpy(posn, hex, 2);
 465         posn += 2;
 466         strcpy(posn, "/");
 467
 468         slot = get_active_slot();
 469         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 470         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 471         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 472         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 473         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 474
 475         if (start_active_slot(slot)) {
 476                 request->slot = slot;
 477                 request->state = RUN_MKCOL;
 478         } else {
 479                 request->state = ABORTED;
 480                 free(request->url);
 481         }
 482 }
 483
 484 static void start_put(struct transfer_request *request)
 485 {
 486         char *hex = sha1_to_hex(request->sha1);
 487         struct active_request_slot *slot;
 488         char *posn;
 489         char type[20];
 490         char hdr[50];
 491         void *unpacked;
 492         unsigned long len;
 493         int hdrlen;
 494         ssize_t size;
 495         z_stream stream;
 496
 497         unpacked = read_sha1_file(request->sha1, type, &len);
 498         hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 499
 500         /* Set it up */
 501         memset(&stream, 0, sizeof(stream));
 502         deflateInit(&stream, Z_BEST_COMPRESSION);
 503         size = deflateBound(&stream, len + hdrlen);
 504         request->buffer.buffer = xmalloc(size);
 505
 506         /* Compress it */
 507         stream.next_out = request->buffer.buffer;
 508         stream.avail_out = size;
 509
 510         /* First header.. */
 511         stream.next_in = (void *)hdr;
 512         stream.avail_in = hdrlen;
 513         while (deflate(&stream, 0) == Z_OK)
 514                 /* nothing */;
 515
 516         /* Then the data itself.. */
 517         stream.next_in = unpacked;
 518         stream.avail_in = len;
 519         while (deflate(&stream, Z_FINISH) == Z_OK)
 520                 /* nothing */;
 521         deflateEnd(&stream);
 522         free(unpacked);
 523
 524         request->buffer.size = stream.total_out;
 525         request->buffer.posn = 0;
 526
 527         if (request->url != NULL)
 528                 free(request->url);
 529         request->url = xmalloc(strlen(remote->url) +
 530                                strlen(request->lock->token) + 51);
 531         strcpy(request->url, remote->url);
 532         posn = request->url + strlen(remote->url);
 533         strcpy(posn, "objects/");
 534         posn += 8;
 535         memcpy(posn, hex, 2);
 536         posn += 2;
 537         *(posn++) = '/';
 538         strcpy(posn, hex + 2);
 539         request->dest = xmalloc(strlen(request->url) + 14);
 540         sprintf(request->dest, "Destination: %s", request->url);
 541         posn += 38;
 542         *(posn++) = '.';
 543         strcpy(posn, request->lock->token);
 544
 545         slot = get_active_slot();
 546         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 547         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 548         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 549         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 550         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 551         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 552         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 553         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 554         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 555
 556         if (start_active_slot(slot)) {
 557                 request->slot = slot;
 558                 request->state = RUN_PUT;
 559         } else {
 560                 request->state = ABORTED;
 561                 free(request->url);
 562         }
 563 }
 564
 565 static void start_move(struct transfer_request *request)
 566 {
 567         struct active_request_slot *slot;
 568         struct curl_slist *dav_headers = NULL;
 569
 570         slot = get_active_slot();
 571         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 572         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 573         dav_headers = curl_slist_append(dav_headers, request->dest);
 574         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 575         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 576         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 577         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 578
 579         if (start_active_slot(slot)) {
 580                 request->slot = slot;
 581                 request->state = RUN_MOVE;
 582         } else {
 583                 request->state = ABORTED;
 584                 free(request->url);
 585         }
 586 }
 587
 588 int refresh_lock(struct active_lock *lock)
 589 {
 590         struct active_request_slot *slot;
 591         char *if_header;
 592         char timeout_header[25];
 593         struct curl_slist *dav_headers = NULL;
 594         int rc = 0;
 595
 596         lock->refreshing = 1;
 597
 598         if_header = xmalloc(strlen(lock->token) + 25);
 599         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 600         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 601         dav_headers = curl_slist_append(dav_headers, if_header);
 602         dav_headers = curl_slist_append(dav_headers, timeout_header);
 603
 604         slot = get_active_slot();
 605         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 606         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 607         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 608         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 609         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 610
 611         if (start_active_slot(slot)) {
 612                 run_active_slot(slot);
 613                 if (slot->curl_result != CURLE_OK) {
 614                         fprintf(stderr, "Got HTTP error %ld\n", slot->http_code);
 615                 } else {
 616                         lock->start_time = time(NULL);
 617                         rc = 1;
 618                 }
 619         }
 620
 621         lock->refreshing = 0;
 622         curl_slist_free_all(dav_headers);
 623         free(if_header);
 624
 625         return rc;
 626 }
 627
 628 static void finish_request(struct transfer_request *request)
 629 {
 630         time_t current_time = time(NULL);
 631         int time_remaining;
 632
 633         request->curl_result =  request->slot->curl_result;
 634         request->http_code = request->slot->http_code;
 635         request->slot = NULL;
 636
 637         /* Refresh the lock if it is close to timing out */
 638         time_remaining = request->lock->start_time + request->lock->timeout
 639                 - current_time;
 640         if (time_remaining < LOCK_REFRESH && !request->lock->refreshing) {
 641                 if (!refresh_lock(request->lock)) {
 642                         fprintf(stderr, "Unable to refresh remote lock\n");
 643                         aborted = 1;
 644                 }
 645         }
 646
 647         if (request->headers != NULL)
 648                 curl_slist_free_all(request->headers);
 649         if (request->state == RUN_HEAD) {
 650                 if (request->http_code == 404) {
 651                         request->state = NEED_PUSH;
 652                 } else if (request->curl_result == CURLE_OK) {
 653                         request->state = COMPLETE;
 654                 } else {
 655                         fprintf(stderr, "HEAD %s failed, aborting (%d/%ld)\n",
 656                                 sha1_to_hex(request->sha1),
 657                                 request->curl_result, request->http_code);
 658                         request->state = ABORTED;
 659                         aborted = 1;
 660                 }
 661         } else if (request->state == RUN_MKCOL) {
 662                 if (request->curl_result == CURLE_OK ||
 663                     request->http_code == 405) {
 664                         start_put(request);
 665                 } else {
 666                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 667                                 sha1_to_hex(request->sha1),
 668                                 request->curl_result, request->http_code);
 669                         request->state = ABORTED;
 670                         aborted = 1;
 671                 }
 672         } else if (request->state == RUN_PUT) {
 673                 if (request->curl_result == CURLE_OK) {
 674                         start_move(request);
 675                 } else {
 676                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 677                                 sha1_to_hex(request->sha1),
 678                                 request->curl_result, request->http_code);
 679                         request->state = ABORTED;
 680                         aborted = 1;
 681                 }
 682         } else if (request->state == RUN_MOVE) {
 683                 if (request->curl_result == CURLE_OK) {
 684                         if (push_verbosely)
 685                                 fprintf(stderr,
 686                                         "sent %s\n",
 687                                         sha1_to_hex(request->sha1));
 688                         request->state = COMPLETE;
 689                 } else {
 690                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 691                                 sha1_to_hex(request->sha1),
 692                                 request->curl_result, request->http_code);
 693                         request->state = ABORTED;
 694                         aborted = 1;
 695                 }
 696         }
 697 }
 698
 699 static void release_request(struct transfer_request *request)
 700 {
 701         struct transfer_request *entry = request_queue_head;
 702
 703         if (request == request_queue_head) {
 704                 request_queue_head = request->next;
 705         } else {
 706                 while (entry->next != NULL && entry->next != request)
 707                         entry = entry->next;
 708                 if (entry->next == request)
 709                         entry->next = entry->next->next;
 710         }
 711
 712         free(request->url);
 713         free(request);
 714 }
 715
 716 #ifdef USE_CURL_MULTI
 717 void process_curl_messages(void)
 718 {
 719         int num_messages;
 720         struct active_request_slot *slot;
 721         struct transfer_request *request = NULL;
 722         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 723
 724         while (curl_message != NULL) {
 725                 if (curl_message->msg == CURLMSG_DONE) {
 726                         slot = active_queue_head;
 727                         while (slot != NULL &&
 728                                slot->curl != curl_message->easy_handle)
 729                                 slot = slot->next;
 730                         if (slot != NULL) {
 731                                 curl_multi_remove_handle(curlm, slot->curl);
 732                                 active_requests--;
 733                                 slot->done = 1;
 734                                 slot->in_use = 0;
 735                                 slot->curl_result = curl_message->data.result;
 736                                 curl_easy_getinfo(slot->curl,
 737                                                   CURLINFO_HTTP_CODE,
 738                                                   &slot->http_code);
 739                                 request = request_queue_head;
 740                                 while (request != NULL &&
 741                                        request->slot != slot)
 742                                         request = request->next;
 743                                 if (request != NULL)
 744                                         finish_request(request);
 745                         } else {
 746                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 747                         }
 748                 } else {
 749                         fprintf(stderr, "Unknown CURL message received: %d\n",
 750                                 (int)curl_message->msg);
 751                 }
 752                 curl_message = curl_multi_info_read(curlm, &num_messages);
 753         }
 754 }
 755
 756 void process_request_queue(void)
 757 {
 758         struct transfer_request *request = request_queue_head;
 759         struct active_request_slot *slot = active_queue_head;
 760         int num_transfers;
 761
 762         if (aborted)
 763                 return;
 764
 765         while (active_requests < max_requests && request != NULL) {
 766                 if (!pushing && request->state == NEED_CHECK) {
 767                         start_check(request);
 768                         curl_multi_perform(curlm, &num_transfers);
 769                 } else if (pushing && request->state == NEED_PUSH) {
 770                         start_mkcol(request);
 771                         curl_multi_perform(curlm, &num_transfers);
 772                 }
 773                 request = request->next;
 774         }
 775
 776         while (slot != NULL) {
 777                 if (!slot->in_use && slot->curl != NULL) {
 778                         curl_easy_cleanup(slot->curl);
 779                         slot->curl = NULL;
 780                 }
 781                 slot = slot->next;
 782         }
 783 }
 784 #endif
 785
 786 void process_waiting_requests(void)
 787 {
 788         struct active_request_slot *slot = active_queue_head;
 789
 790         while (slot != NULL)
 791                 if (slot->in_use) {
 792                         run_active_slot(slot);
 793                         slot = active_queue_head;
 794                 } else {
 795                         slot = slot->next;
 796                 }
 797 }
 798
 799 void add_request(unsigned char *sha1, struct active_lock *lock)
 800 {
 801         struct transfer_request *request = request_queue_head;
 802         struct packed_git *target;
 803
 804         while (request != NULL && memcmp(request->sha1, sha1, 20))
 805                 request = request->next;
 806         if (request != NULL)
 807                 return;
 808
 809         target = find_sha1_pack(sha1, remote->packs);
 810         if (target)
 811                 return;
 812
 813         request = xmalloc(sizeof(*request));
 814         memcpy(request->sha1, sha1, 20);
 815         request->url = NULL;
 816         request->lock = lock;
 817         request->headers = NULL;
 818         request->state = NEED_CHECK;
 819         request->next = request_queue_head;
 820         request_queue_head = request;
 821 #ifdef USE_CURL_MULTI
 822         process_request_queue();
 823         process_curl_messages();
 824 #endif
 825 }
 826
 827 static int fetch_index(unsigned char *sha1)
 828 {
 829         char *hex = sha1_to_hex(sha1);
 830         char *filename;
 831         char *url;
 832         char tmpfile[PATH_MAX];
 833         long prev_posn = 0;
 834         char range[RANGE_HEADER_SIZE];
 835         struct curl_slist *range_header = NULL;
 836
 837         FILE *indexfile;
 838         struct active_request_slot *slot;
 839
 840         /* Don't use the index if the pack isn't there */
 841         url = xmalloc(strlen(remote->url) + 65);
 842         sprintf(url, "%s/objects/pack/pack-%s.pack", remote->url, hex);
 843         slot = get_active_slot();
 844         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 845         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 846         if (start_active_slot(slot)) {
 847                 run_active_slot(slot);
 848                 if (slot->curl_result != CURLE_OK) {
 849                         free(url);
 850                         return error("Unable to verify pack %s is available",
 851                                      hex);
 852                 }
 853         } else {
 854                 return error("Unable to start request");
 855         }
 856
 857         if (has_pack_index(sha1))
 858                 return 0;
 859
 860         if (push_verbosely)
 861                 fprintf(stderr, "Getting index for pack %s\n", hex);
 862
 863         sprintf(url, "%s/objects/pack/pack-%s.idx", remote->url, hex);
 864
 865         filename = sha1_pack_index_name(sha1);
 866         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 867         indexfile = fopen(tmpfile, "a");
 868         if (!indexfile)
 869                 return error("Unable to open local file %s for pack index",
 870                              filename);
 871
 872         slot = get_active_slot();
 873         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 874         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 875         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 876         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 877         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 878         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 879         slot->local = indexfile;
 880
 881         /* If there is data present from a previous transfer attempt,
 882            resume where it left off */
 883         prev_posn = ftell(indexfile);
 884         if (prev_posn>0) {
 885                 if (push_verbosely)
 886                         fprintf(stderr,
 887                                 "Resuming fetch of index for pack %s at byte %ld\n",
 888                                 hex, prev_posn);
 889                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 890                 range_header = curl_slist_append(range_header, range);
 891                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 892         }
 893
 894         if (start_active_slot(slot)) {
 895                 run_active_slot(slot);
 896                 if (slot->curl_result != CURLE_OK) {
 897                         free(url);
 898                         fclose(indexfile);
 899                         return error("Unable to get pack index %s\n%s", url,
 900                                      curl_errorstr);
 901                 }
 902         } else {
 903                 free(url);
 904                 return error("Unable to start request");
 905         }
 906
 907         free(url);
 908         fclose(indexfile);
 909
 910         return move_temp_to_file(tmpfile, filename);
 911 }
 912
 913 static int setup_index(unsigned char *sha1)
 914 {
 915         struct packed_git *new_pack;
 916
 917         if (fetch_index(sha1))
 918                 return -1;
 919
 920         new_pack = parse_pack_index(sha1);
 921         new_pack->next = remote->packs;
 922         remote->packs = new_pack;
 923         return 0;
 924 }
 925
 926 static int fetch_indices()
 927 {
 928         unsigned char sha1[20];
 929         char *url;
 930         struct buffer buffer;
 931         char *data;
 932         int i = 0;
 933
 934         struct active_request_slot *slot;
 935
 936         data = xmalloc(4096);
 937         memset(data, 0, 4096);
 938         buffer.size = 4096;
 939         buffer.posn = 0;
 940         buffer.buffer = data;
 941
 942         if (push_verbosely)
 943                 fprintf(stderr, "Getting pack list\n");
 944
 945         url = xmalloc(strlen(remote->url) + 21);
 946         sprintf(url, "%s/objects/info/packs", remote->url);
 947
 948         slot = get_active_slot();
 949         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 950         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 951                          fwrite_buffer_dynamic);
 952         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 953         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 954         if (start_active_slot(slot)) {
 955                 run_active_slot(slot);
 956                 if (slot->curl_result != CURLE_OK) {
 957                         free(buffer.buffer);
 958                         free(url);
 959                         if (slot->http_code == 404)
 960                                 return 0;
 961                         else
 962                                 return error("%s", curl_errorstr);
 963                 }
 964         } else {
 965                 free(buffer.buffer);
 966                 free(url);
 967                 return error("Unable to start request");
 968         }
 969         free(url);
 970
 971         data = buffer.buffer;
 972         while (i < buffer.posn) {
 973                 switch (data[i]) {
 974                 case 'P':
 975                         i++;
 976                         if (i + 52 < buffer.posn &&
 977                             !strncmp(data + i, " pack-", 6) &&
 978                             !strncmp(data + i + 46, ".pack\n", 6)) {
 979                                 get_sha1_hex(data + i + 6, sha1);
 980                                 setup_index(sha1);
 981                                 i += 51;
 982                                 break;
 983                         }
 984                 default:
 985                         while (data[i] != '\n')
 986                                 i++;
 987                 }
 988                 i++;
 989         }
 990
 991         free(buffer.buffer);
 992         return 0;
 993 }
 994
 995 static inline int needs_quote(int ch)
 996 {
 997         switch (ch) {
 998         case '/': case '-': case '.':
 999         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1000                 return 0;
1001         default:
1002                 return 1;
1003         }
1004 }
1005
1006 static inline int hex(int v)
1007 {
1008         if (v < 10) return '0' + v;
1009         else return 'A' + v - 10;
1010 }
1011
1012 static char *quote_ref_url(const char *base, const char *ref)
1013 {
1014         const char *cp;
1015         char *dp, *qref;
1016         int len, baselen, ch;
1017
1018         baselen = strlen(base);
1019         len = baselen + 12; /* "refs/heads/" + NUL */
1020         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1021                 if (needs_quote(ch))
1022                         len += 2; /* extra two hex plus replacement % */
1023         qref = xmalloc(len);
1024         memcpy(qref, base, baselen);
1025         memcpy(qref + baselen, "refs/heads/", 11);
1026         for (cp = ref, dp = qref + baselen + 11; (ch = *cp) != 0; cp++) {
1027                 if (needs_quote(ch)) {
1028                         *dp++ = '%';
1029                         *dp++ = hex((ch >> 4) & 0xF);
1030                         *dp++ = hex(ch & 0xF);
1031                 }
1032                 else
1033                         *dp++ = ch;
1034         }
1035         *dp = 0;
1036
1037         return qref;
1038 }
1039
1040 int fetch_ref(char *ref, unsigned char *sha1)
1041 {
1042         char *url;
1043         char hex[42];
1044         struct buffer buffer;
1045         char *base = remote->url;
1046         struct active_request_slot *slot;
1047         buffer.size = 41;
1048         buffer.posn = 0;
1049         buffer.buffer = hex;
1050         hex[41] = '\0';
1051
1052         url = quote_ref_url(base, ref);
1053         slot = get_active_slot();
1054         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1055         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1056                          fwrite_buffer_dynamic);
1057         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1058         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1059         if (start_active_slot(slot)) {
1060                 run_active_slot(slot);
1061                 if (slot->curl_result != CURLE_OK)
1062                         return error("Couldn't get %s for %s\n%s",
1063                                      url, ref, curl_errorstr);
1064         } else {
1065                 return error("Unable to start request");
1066         }
1067
1068         hex[40] = '\0';
1069         get_sha1_hex(hex, sha1);
1070         return 0;
1071 }
1072
1073 static void
1074 start_activelock_element(void *userData, const char *name, const char **atts)
1075 {
1076         struct active_lock *lock = (struct active_lock *)userData;
1077
1078         if (lock->ctx_activelock && !strcmp(name, "D:timeout"))
1079                 lock->ctx_timeout = 1;
1080         else if (lock->ctx_owner && strstr(name, "href"))
1081                 lock->ctx_owner_href = 1;
1082         else if (lock->ctx_activelock && strstr(name, "owner"))
1083                 lock->ctx_owner = 1;
1084         else if (lock->ctx_locktoken && !strcmp(name, "D:href"))
1085                 lock->ctx_locktoken_href = 1;
1086         else if (lock->ctx_activelock && !strcmp(name, "D:locktoken"))
1087                 lock->ctx_locktoken = 1;
1088         else if (!strcmp(name, "D:activelock"))
1089                 lock->ctx_activelock = 1;
1090 }
1091
1092 static void
1093 end_activelock_element(void *userData, const char *name)
1094 {
1095         struct active_lock *lock = (struct active_lock *)userData;
1096
1097         if (lock->ctx_timeout && !strcmp(name, "D:timeout")) {
1098                 lock->ctx_timeout = 0;
1099         } else if (lock->ctx_owner_href && strstr(name, "href")) {
1100                 lock->ctx_owner_href = 0;
1101         } else if (lock->ctx_owner && strstr(name, "owner")) {
1102                 lock->ctx_owner = 0;
1103         } else if (lock->ctx_locktoken_href && !strcmp(name, "D:href")) {
1104                 lock->ctx_locktoken_href = 0;
1105         } else if (lock->ctx_locktoken && !strcmp(name, "D:locktoken")) {
1106                 lock->ctx_locktoken = 0;
1107         } else if (lock->ctx_activelock && !strcmp(name, "D:activelock")) {
1108                 lock->ctx_activelock = 0;
1109         }
1110 }
1111
1112 static void
1113 activelock_cdata(void *userData, const XML_Char *s, int len)
1114 {
1115         struct active_lock *lock = (struct active_lock *)userData;
1116         char *this = malloc(len+1);
1117         strncpy(this, s, len);
1118
1119         if (lock->ctx_owner_href) {
1120                 lock->owner = malloc(len+1);
1121                 strcpy(lock->owner, this);
1122         } else if (lock->ctx_locktoken_href) {
1123                 if (!strncmp(this, "opaquelocktoken:", 16)) {
1124                         lock->token = malloc(len-15);
1125                         strcpy(lock->token, this+16);
1126                 }
1127         } else if (lock->ctx_timeout) {
1128                 if (!strncmp(this, "Second-", 7))
1129                         lock->timeout = strtol(this+7, NULL, 10);
1130         }
1131
1132         free(this);
1133 }
1134
1135 static void
1136 start_lockprop_element(void *userData, const char *name, const char **atts)
1137 {
1138         struct lockprop *prop = (struct lockprop *)userData;
1139
1140         if (prop->lock_type && !strcmp(name, "D:write")) {
1141                 if (prop->lock_exclusive) {
1142                         prop->lock_exclusive_write = 1;
1143                 }
1144         } else if (prop->lock_scope && !strcmp(name, "D:exclusive")) {
1145                 prop->lock_exclusive = 1;
1146         } else if (prop->lock_entry) {
1147                 if (!strcmp(name, "D:lockscope")) {
1148                         prop->lock_scope = 1;
1149                 } else if (!strcmp(name, "D:locktype")) {
1150                         prop->lock_type = 1;
1151                 }
1152         } else if (prop->supported_lock) {
1153                 if (!strcmp(name, "D:lockentry")) {
1154                         prop->lock_entry = 1;
1155                 }
1156         } else if (!strcmp(name, "D:supportedlock")) {
1157                 prop->supported_lock = 1;
1158         }
1159 }
1160
1161 static void
1162 end_lockprop_element(void *userData, const char *name)
1163 {
1164         struct lockprop *prop = (struct lockprop *)userData;
1165
1166         if (!strcmp(name, "D:lockentry")) {
1167                 prop->lock_entry = 0;
1168                 prop->lock_scope = 0;
1169                 prop->lock_type = 0;
1170                 prop->lock_exclusive = 0;
1171         } else if (!strcmp(name, "D:supportedlock")) {
1172                 prop->supported_lock = 0;
1173         }
1174 }
1175
1176 struct active_lock *lock_remote(char *file, long timeout)
1177 {
1178         struct active_request_slot *slot;
1179         struct buffer out_buffer;
1180         struct buffer in_buffer;
1181         char *out_data;
1182         char *in_data;
1183         char *url;
1184         char *ep;
1185         char timeout_header[25];
1186         struct active_lock *new_lock;
1187         XML_Parser parser = XML_ParserCreate(NULL);
1188         enum XML_Status result;
1189         struct curl_slist *dav_headers = NULL;
1190
1191         url = xmalloc(strlen(remote->url) + strlen(file) + 1);
1192         sprintf(url, "%s%s", remote->url, file);
1193
1194         /* Make sure leading directories exist for the remote ref */
1195         ep = strchr(url + strlen(remote->url) + 11, '/');
1196         while (ep) {
1197                 *ep = 0;
1198                 slot = get_active_slot();
1199                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1200                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1201                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1202                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1203                 if (start_active_slot(slot)) {
1204                         run_active_slot(slot);
1205                         if (slot->curl_result != CURLE_OK &&
1206                             slot->http_code != 405) {
1207                                 fprintf(stderr,
1208                                         "Unable to create branch path %s\n",
1209                                         url);
1210                                 free(url);
1211                                 return NULL;
1212                         }
1213                 } else {
1214                         fprintf(stderr, "Unable to start request\n");
1215                         free(url);
1216                         return NULL;
1217                 }
1218                 *ep = '/';
1219                 ep = strchr(ep + 1, '/');
1220         }
1221
1222         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1223         out_data = xmalloc(out_buffer.size + 1);
1224         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1225         out_buffer.posn = 0;
1226         out_buffer.buffer = out_data;
1227
1228         in_buffer.size = 4096;
1229         in_data = xmalloc(in_buffer.size);
1230         in_buffer.posn = 0;
1231         in_buffer.buffer = in_data;
1232
1233         new_lock = xmalloc(sizeof(*new_lock));
1234         new_lock->owner = NULL;
1235         new_lock->token = NULL;
1236         new_lock->timeout = -1;
1237         new_lock->refreshing = 0;
1238
1239         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1240         dav_headers = curl_slist_append(dav_headers, timeout_header);
1241         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1242
1243         slot = get_active_slot();
1244         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1245         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1246         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1247         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1248         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1249                          fwrite_buffer_dynamic);
1250         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1251         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1252         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1253         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1254
1255         if (start_active_slot(slot)) {
1256                 run_active_slot(slot);
1257                 if (slot->curl_result != CURLE_OK) {
1258                         fprintf(stderr, "Got HTTP error %ld\n", slot->http_code);
1259                         free(new_lock);
1260                         free(url);
1261                         free(out_data);
1262                         free(in_data);
1263                         return NULL;
1264                 }
1265         } else {
1266                 free(new_lock);
1267                 free(url);
1268                 free(out_data);
1269                 free(in_data);
1270                 fprintf(stderr, "Unable to start request\n");
1271                 return NULL;
1272         }
1273
1274         free(out_data);
1275
1276         XML_SetUserData(parser, new_lock);
1277         XML_SetElementHandler(parser, start_activelock_element,
1278                                       end_activelock_element);
1279         XML_SetCharacterDataHandler(parser, activelock_cdata);
1280         result = XML_Parse(parser, in_buffer.buffer, in_buffer.posn, 1);
1281         free(in_data);
1282         if (result != XML_STATUS_OK) {
1283                 fprintf(stderr, "%s", XML_ErrorString(
1284                                 XML_GetErrorCode(parser)));
1285                 free(url);
1286                 free(new_lock);
1287                 return NULL;
1288         }
1289
1290         if (new_lock->token == NULL || new_lock->timeout <= 0) {
1291                 if (new_lock->token != NULL)
1292                         free(new_lock->token);
1293                 if (new_lock->owner != NULL)
1294                         free(new_lock->owner);
1295                 free(url);
1296                 free(new_lock);
1297                 return NULL;
1298         }
1299
1300         new_lock->url = url;
1301         new_lock->start_time = time(NULL);
1302         return new_lock;
1303 }
1304
1305 int unlock_remote(struct active_lock *lock)
1306 {
1307         struct active_request_slot *slot;
1308         char *lock_token_header;
1309         struct curl_slist *dav_headers = NULL;
1310         int rc = 0;
1311
1312         lock_token_header = xmalloc(strlen(lock->token) + 31);
1313         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1314                 lock->token);
1315         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1316
1317         slot = get_active_slot();
1318         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1319         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1320         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1321         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1322
1323         if (start_active_slot(slot)) {
1324                 run_active_slot(slot);
1325                 if (slot->curl_result == CURLE_OK)
1326                         rc = 1;
1327                 else
1328                         fprintf(stderr, "Got HTTP error %ld\n",
1329                                 slot->http_code);
1330         } else {
1331                 fprintf(stderr, "Unable to start request\n");
1332         }
1333
1334         curl_slist_free_all(dav_headers);
1335         free(lock_token_header);
1336
1337         if (lock->owner != NULL)
1338                 free(lock->owner);
1339         free(lock->url);
1340         free(lock->token);
1341         free(lock);
1342
1343         return rc;
1344 }
1345
1346 int check_locking()
1347 {
1348         struct active_request_slot *slot;
1349         struct buffer in_buffer;
1350         struct buffer out_buffer;
1351         char *in_data;
1352         char *out_data;
1353         XML_Parser parser = XML_ParserCreate(NULL);
1354         enum XML_Status result;
1355         struct lockprop supported_lock;
1356         struct curl_slist *dav_headers = NULL;
1357
1358         out_buffer.size = strlen(PROPFIND_REQUEST) + strlen(remote->url) - 2;
1359         out_data = xmalloc(out_buffer.size + 1);
1360         snprintf(out_data, out_buffer.size + 1, PROPFIND_REQUEST, remote->url);
1361         out_buffer.posn = 0;
1362         out_buffer.buffer = out_data;
1363
1364         in_buffer.size = 4096;
1365         in_data = xmalloc(in_buffer.size);
1366         in_buffer.posn = 0;
1367         in_buffer.buffer = in_data;
1368
1369         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1370         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1371
1372         slot = get_active_slot();
1373         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1374         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1375         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1376         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1377         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1378                          fwrite_buffer_dynamic);
1379         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1380         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1381         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1382         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1383
1384         if (start_active_slot(slot)) {
1385                 run_active_slot(slot);
1386                 free(out_data);
1387                 if (slot->curl_result != CURLE_OK) {
1388                         free(in_buffer.buffer);
1389                         return -1;
1390                 }
1391
1392                 XML_SetUserData(parser, &supported_lock);
1393                 XML_SetElementHandler(parser, start_lockprop_element,
1394                                       end_lockprop_element);
1395                 result = XML_Parse(parser, in_buffer.buffer, in_buffer.posn, 1);
1396                 free(in_buffer.buffer);
1397                 if (result != XML_STATUS_OK)
1398                         return error("%s", XML_ErrorString(
1399                                              XML_GetErrorCode(parser)));
1400         } else {
1401                 free(out_data);
1402                 free(in_buffer.buffer);
1403                 return error("Unable to start request");
1404         }
1405
1406         if (supported_lock.lock_exclusive_write)
1407                 return 0;
1408         else
1409                 return 1;
1410 }
1411
1412 int is_ancestor(unsigned char *sha1, struct commit *commit)
1413 {
1414         struct commit_list *parents;
1415
1416         if (parse_commit(commit))
1417                 return 0;
1418         parents = commit->parents;
1419         for (; parents; parents = parents->next) {
1420                 if (!memcmp(sha1, parents->item->object.sha1, 20)) {
1421                         return 1;
1422                 } else if (parents->item->object.type == commit_type) {
1423                         if (is_ancestor(
1424                                     sha1,
1425                                     (struct commit *)&parents->item->object
1426                                     ))
1427                                 return 1;
1428                 }
1429         }
1430         return 0;
1431 }
1432
1433 void get_delta(unsigned char *sha1, struct object *obj,
1434                struct active_lock *lock)
1435 {
1436         struct commit *commit;
1437         struct commit_list *parents;
1438         struct tree *tree;
1439         struct tree_entry_list *entry;
1440
1441         if (sha1 && !memcmp(sha1, obj->sha1, 20))
1442                 return;
1443
1444         if (aborted)
1445                 return;
1446
1447         if (obj->type == commit_type) {
1448                 if (push_verbosely)
1449                         fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
1450                 add_request(obj->sha1, lock);
1451                 commit = (struct commit *)obj;
1452                 if (parse_commit(commit)) {
1453                         fprintf(stderr, "Error parsing commit %s\n",
1454                                 sha1_to_hex(obj->sha1));
1455                         aborted = 1;
1456                         return;
1457                 }
1458                 parents = commit->parents;
1459                 for (; parents; parents = parents->next)
1460                         if (sha1 == NULL ||
1461                             memcmp(sha1, parents->item->object.sha1, 20))
1462                                 get_delta(sha1, &parents->item->object,
1463                                           lock);
1464                 get_delta(sha1, &commit->tree->object, lock);
1465         } else if (obj->type == tree_type) {
1466                 if (push_verbosely)
1467                         fprintf(stderr, "walk %s\n", sha1_to_hex(obj->sha1));
1468                 add_request(obj->sha1, lock);
1469                 tree = (struct tree *)obj;
1470                 if (parse_tree(tree)) {
1471                         fprintf(stderr, "Error parsing tree %s\n",
1472                                 sha1_to_hex(obj->sha1));
1473                         aborted = 1;
1474                         return;
1475                 }
1476                 entry = tree->entries;
1477                 tree->entries = NULL;
1478                 while (entry) {
1479                         struct tree_entry_list *next = entry->next;
1480                         get_delta(sha1, entry->item.any, lock);
1481                         free(entry->name);
1482                         free(entry);
1483                         entry = next;
1484                 }
1485         } else if (obj->type == blob_type || obj->type == tag_type) {
1486                 add_request(obj->sha1, lock);
1487         }
1488 }
1489
1490 int update_remote(unsigned char *sha1, struct active_lock *lock)
1491 {
1492         struct active_request_slot *slot;
1493         char *out_data;
1494         char *if_header;
1495         struct buffer out_buffer;
1496         struct curl_slist *dav_headers = NULL;
1497         int i;
1498
1499         if_header = xmalloc(strlen(lock->token) + 25);
1500         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1501         dav_headers = curl_slist_append(dav_headers, if_header);
1502
1503         out_buffer.size = 41;
1504         out_data = xmalloc(out_buffer.size + 1);
1505         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1506         if (i != out_buffer.size) {
1507                 fprintf(stderr, "Unable to initialize PUT request body\n");
1508                 return 0;
1509         }
1510         out_buffer.posn = 0;
1511         out_buffer.buffer = out_data;
1512
1513         slot = get_active_slot();
1514         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1515         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1516         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1517         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1518         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1519         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1520         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1521         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1522         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1523
1524         if (start_active_slot(slot)) {
1525                 run_active_slot(slot);
1526                 free(out_data);
1527                 free(if_header);
1528                 if (slot->curl_result != CURLE_OK) {
1529                         fprintf(stderr,
1530                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1531                                 slot->curl_result, slot->http_code);
1532                         /* We should attempt recovery? */
1533                         return 0;
1534                 }
1535         } else {
1536                 free(out_data);
1537                 free(if_header);
1538                 fprintf(stderr, "Unable to start PUT request\n");
1539                 return 0;
1540         }
1541
1542         return 1;
1543 }
1544
1545 int main(int argc, char **argv)
1546 {
1547         struct active_request_slot *slot;
1548         struct active_request_slot *next_slot;
1549         struct transfer_request *request;
1550         struct transfer_request *next_request;
1551         int nr_refspec = 0;
1552         char **refspec = NULL;
1553         int do_remote_update;
1554         int new_branch;
1555         int force_this;
1556         char *local_ref;
1557         unsigned char local_sha1[20];
1558         struct object *local_object = NULL;
1559         char *remote_ref = NULL;
1560         unsigned char remote_sha1[20];
1561         struct active_lock *remote_lock;
1562         char *remote_path = NULL;
1563         char *low_speed_limit;
1564         char *low_speed_time;
1565         int rc = 0;
1566         int i;
1567
1568         setup_ident();
1569
1570         remote = xmalloc(sizeof(*remote));
1571         remote->url = NULL;
1572         remote->packs = NULL;
1573
1574         argv++;
1575         for (i = 1; i < argc; i++, argv++) {
1576                 char *arg = *argv;
1577
1578                 if (*arg == '-') {
1579                         if (!strcmp(arg, "--complete")) {
1580                                 push_all = 1;
1581                                 continue;
1582                         }
1583                         if (!strcmp(arg, "--force")) {
1584                                 force_all = 1;
1585                                 continue;
1586                         }
1587                         if (!strcmp(arg, "--verbose")) {
1588                                 push_verbosely = 1;
1589                                 continue;
1590                         }
1591                         usage(http_push_usage);
1592                 }
1593                 if (!remote->url) {
1594                         remote->url = arg;
1595                         continue;
1596                 }
1597                 refspec = argv;
1598                 nr_refspec = argc - i;
1599                 break;
1600         }
1601
1602         curl_global_init(CURL_GLOBAL_ALL);
1603
1604 #ifdef USE_CURL_MULTI
1605         {
1606                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1607                 if (http_max_requests != NULL)
1608                         max_requests = atoi(http_max_requests);
1609         }
1610
1611         curlm = curl_multi_init();
1612         if (curlm == NULL) {
1613                 fprintf(stderr, "Error creating curl multi handle.\n");
1614                 return 1;
1615         }
1616 #endif
1617
1618         if (getenv("GIT_SSL_NO_VERIFY"))
1619                 curl_ssl_verify = 0;
1620
1621         ssl_cert = getenv("GIT_SSL_CERT");
1622 #if LIBCURL_VERSION_NUM >= 0x070902
1623         ssl_key = getenv("GIT_SSL_KEY");
1624 #endif
1625 #if LIBCURL_VERSION_NUM >= 0x070908
1626         ssl_capath = getenv("GIT_SSL_CAPATH");
1627 #endif
1628         ssl_cainfo = getenv("GIT_SSL_CAINFO");
1629
1630         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1631         if (low_speed_limit != NULL)
1632                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1633         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1634         if (low_speed_time != NULL)
1635                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1636
1637         git_config(http_options);
1638
1639         if (curl_ssl_verify == -1)
1640                 curl_ssl_verify = 1;
1641
1642 #ifdef USE_CURL_MULTI
1643         if (max_requests < 1)
1644                 max_requests = DEFAULT_MAX_REQUESTS;
1645 #endif
1646
1647         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
1648         default_headers = curl_slist_append(default_headers, "Range:");
1649         default_headers = curl_slist_append(default_headers, "Destination:");
1650         default_headers = curl_slist_append(default_headers, "If:");
1651         default_headers = curl_slist_append(default_headers,
1652                                             "Pragma: no-cache");
1653
1654 #ifndef NO_CURL_EASY_DUPHANDLE
1655         curl_default = get_curl_handle();
1656 #endif
1657
1658         /* Verify DAV compliance/lock support */
1659         if (check_locking() != 0) {
1660                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
1661                 rc = 1;
1662                 goto cleanup;
1663         }
1664
1665         /* Process each refspec */
1666         for (i = 0; i < nr_refspec; i++) {
1667                 char *ep;
1668                 force_this = 0;
1669                 do_remote_update = 0;
1670                 new_branch = 0;
1671                 local_ref = refspec[i];
1672                 if (*local_ref == '+') {
1673                         force_this = 1;
1674                         local_ref++;
1675                 }
1676                 ep = strchr(local_ref, ':');
1677                 if (ep) {
1678                         remote_ref = ep + 1;
1679                         *ep = 0;
1680                 }
1681                 else
1682                         remote_ref = local_ref;
1683
1684                 /* Lock remote branch ref */
1685                 if (remote_path)
1686                         free(remote_path);
1687                 remote_path = xmalloc(strlen(remote_ref) + 12);
1688                 sprintf(remote_path, "refs/heads/%s", remote_ref);
1689                 remote_lock = lock_remote(remote_path, LOCK_TIME);
1690                 if (remote_lock == NULL) {
1691                         fprintf(stderr, "Unable to lock remote branch %s\n",
1692                                 remote_ref);
1693                         rc = 1;
1694                         continue;
1695                 }
1696
1697                 /* Resolve local and remote refs */
1698                 if (fetch_ref(remote_ref, remote_sha1) != 0) {
1699                         fprintf(stderr,
1700                                 "Remote branch %s does not exist on %s\n",
1701                                 remote_ref, remote->url);
1702                         new_branch = 1;
1703                 }
1704                 if (get_sha1(local_ref, local_sha1) != 0) {
1705                         fprintf(stderr, "Error resolving local branch %s\n",
1706                                 local_ref);
1707                         rc = 1;
1708                         goto unlock;
1709                 }
1710
1711                 /* Find relationship between local and remote */
1712                 local_object = parse_object(local_sha1);
1713                 if (!local_object) {
1714                         fprintf(stderr, "Unable to parse local object %s\n",
1715                                 sha1_to_hex(local_sha1));
1716                         rc = 1;
1717                         goto unlock;
1718                 } else if (new_branch) {
1719                         do_remote_update = 1;
1720                 } else {
1721                         if (!memcmp(local_sha1, remote_sha1, 20)) {
1722                                 fprintf(stderr,
1723                                         "* %s: same as branch '%s' of %s\n",
1724                                         local_ref, remote_ref, remote->url);
1725                         } else if (is_ancestor(remote_sha1,
1726                                                (struct commit *)local_object)) {
1727                                 fprintf(stderr,
1728                                         "Remote %s will fast-forward to local %s\n",
1729                                         remote_ref, local_ref);
1730                                 do_remote_update = 1;
1731                         } else if (force_all || force_this) {
1732                                 fprintf(stderr,
1733                                         "* %s on %s does not fast forward to local branch '%s', overwriting\n",
1734                                         remote_ref, remote->url, local_ref);
1735                                 do_remote_update = 1;
1736                         } else {
1737                                 fprintf(stderr,
1738                                         "* %s on %s does not fast forward to local branch '%s'\n",
1739                                         remote_ref, remote->url, local_ref);
1740                                 rc = 1;
1741                                 goto unlock;
1742                         }
1743                 }
1744
1745                 /* Generate and check list of required objects */
1746                 pushing = 0;
1747                 if (do_remote_update || push_all)
1748                         fetch_indices();
1749                 get_delta(push_all ? NULL : remote_sha1,
1750                           local_object, remote_lock);
1751                 process_waiting_requests();
1752
1753                 /* Push missing objects to remote, this would be a
1754                    convenient time to pack them first if appropriate. */
1755                 pushing = 1;
1756                 process_request_queue();
1757                 process_waiting_requests();
1758
1759                 /* Update the remote branch if all went well */
1760                 if (do_remote_update) {
1761                         if (!aborted && update_remote(local_sha1,
1762                                                       remote_lock)) {
1763                                 fprintf(stderr, "%s remote branch %s\n",
1764                                         new_branch ? "Created" : "Updated",
1765                                         remote_ref);
1766                         } else {
1767                                 fprintf(stderr,
1768                                         "Unable to %s remote branch %s\n",
1769                                         new_branch ? "create" : "update",
1770                                         remote_ref);
1771                                 rc = 1;
1772                                 goto unlock;
1773                         }
1774                 }
1775
1776         unlock:
1777                 unlock_remote(remote_lock);
1778                 free(remote_path);
1779         }
1780
1781  cleanup:
1782         free(remote);
1783
1784         curl_slist_free_all(no_pragma_header);
1785         curl_slist_free_all(default_headers);
1786
1787         slot = active_queue_head;
1788         while (slot != NULL) {
1789                 next_slot = slot->next;
1790                 if (slot->curl != NULL)
1791                         curl_easy_cleanup(slot->curl);
1792                 free(slot);
1793                 slot = next_slot;
1794         }
1795
1796         request = request_queue_head;
1797         while (request != NULL) {
1798                 next_request = request->next;
1799                 release_request(request);
1800                 request = next_request;
1801         }
1802
1803 #ifndef NO_CURL_EASY_DUPHANDLE
1804         curl_easy_cleanup(curl_default);
1805 #endif
1806 #ifdef USE_CURL_MULTI
1807         curl_multi_cleanup(curlm);
1808 #endif
1809         curl_global_cleanup();
1810         return rc;
1811 }