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 #include "http.h"
   8 #include "refs.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "exec_cmd.h"
  12
  13 #include <expat.h>
  14
  15 static const char http_push_usage[] =
  16 "git-http-push [--all] [--force] [--verbose] <remote> [<head>...]\n";
  17
  18 #ifndef XML_STATUS_OK
  19 enum XML_Status {
  20   XML_STATUS_OK = 1,
  21   XML_STATUS_ERROR = 0
  22 };
  23 #define XML_STATUS_OK    1
  24 #define XML_STATUS_ERROR 0
  25 #endif
  26
  27 #define PREV_BUF_SIZE 4096
  28 #define RANGE_HEADER_SIZE 30
  29
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #define PROPFIND_SUPPORTEDLOCK_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>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #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>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing;
  74 static int aborted;
  75 static signed char remote_dir_exists[256];
  76
  77 static struct curl_slist *no_pragma_header;
  78 static struct curl_slist *default_headers;
  79
  80 static int push_verbosely;
  81 static int push_all;
  82 static int force_all;
  83
  84 static struct object_list *objects;
  85
  86 struct repo
  87 {
  88         char *url;
  89         int path_len;
  90         int has_info_refs;
  91         int can_update_info_refs;
  92         int has_info_packs;
  93         struct packed_git *packs;
  94         struct remote_lock *locks;
  95 };
  96
  97 static struct repo *remote;
  98
  99 enum transfer_state {
 100         NEED_FETCH,
 101         RUN_FETCH_LOOSE,
 102         RUN_FETCH_PACKED,
 103         NEED_PUSH,
 104         RUN_MKCOL,
 105         RUN_PUT,
 106         RUN_MOVE,
 107         ABORTED,
 108         COMPLETE,
 109 };
 110
 111 struct transfer_request
 112 {
 113         struct object *obj;
 114         char *url;
 115         char *dest;
 116         struct remote_lock *lock;
 117         struct curl_slist *headers;
 118         struct buffer buffer;
 119         char filename[PATH_MAX];
 120         char tmpfile[PATH_MAX];
 121         int local_fileno;
 122         FILE *local_stream;
 123         enum transfer_state state;
 124         CURLcode curl_result;
 125         char errorstr[CURL_ERROR_SIZE];
 126         long http_code;
 127         unsigned char real_sha1[20];
 128         SHA_CTX c;
 129         z_stream stream;
 130         int zret;
 131         int rename;
 132         void *userData;
 133         struct active_request_slot *slot;
 134         struct transfer_request *next;
 135 };
 136
 137 static struct transfer_request *request_queue_head;
 138
 139 struct xml_ctx
 140 {
 141         char *name;
 142         int len;
 143         char *cdata;
 144         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 145         void *userData;
 146 };
 147
 148 struct remote_lock
 149 {
 150         char *url;
 151         char *owner;
 152         char *token;
 153         time_t start_time;
 154         long timeout;
 155         int refreshing;
 156         struct remote_lock *next;
 157 };
 158
 159 /* Flags that control remote_ls processing */
 160 #define PROCESS_FILES (1u << 0)
 161 #define PROCESS_DIRS  (1u << 1)
 162 #define RECURSIVE     (1u << 2)
 163
 164 /* Flags that remote_ls passes to callback functions */
 165 #define IS_DIR (1u << 0)
 166
 167 struct remote_ls_ctx
 168 {
 169         char *path;
 170         void (*userFunc)(struct remote_ls_ctx *ls);
 171         void *userData;
 172         int flags;
 173         char *dentry_name;
 174         int dentry_flags;
 175         struct remote_ls_ctx *parent;
 176 };
 177
 178 static void finish_request(struct transfer_request *request);
 179 static void release_request(struct transfer_request *request);
 180
 181 static void process_response(void *callback_data)
 182 {
 183         struct transfer_request *request =
 184                 (struct transfer_request *)callback_data;
 185
 186         finish_request(request);
 187 }
 188
 189 #ifdef USE_CURL_MULTI
 190 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 191                                void *data)
 192 {
 193         unsigned char expn[4096];
 194         size_t size = eltsize * nmemb;
 195         int posn = 0;
 196         struct transfer_request *request = (struct transfer_request *)data;
 197         do {
 198                 ssize_t retval = xwrite(request->local_fileno,
 199                                        (char *) ptr + posn, size - posn);
 200                 if (retval < 0)
 201                         return posn;
 202                 posn += retval;
 203         } while (posn < size);
 204
 205         request->stream.avail_in = size;
 206         request->stream.next_in = ptr;
 207         do {
 208                 request->stream.next_out = expn;
 209                 request->stream.avail_out = sizeof(expn);
 210                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 211                 SHA1_Update(&request->c, expn,
 212                             sizeof(expn) - request->stream.avail_out);
 213         } while (request->stream.avail_in && request->zret == Z_OK);
 214         data_received++;
 215         return size;
 216 }
 217
 218 static void start_fetch_loose(struct transfer_request *request)
 219 {
 220         char *hex = sha1_to_hex(request->obj->sha1);
 221         char *filename;
 222         char prevfile[PATH_MAX];
 223         char *url;
 224         char *posn;
 225         int prevlocal;
 226         unsigned char prev_buf[PREV_BUF_SIZE];
 227         ssize_t prev_read = 0;
 228         long prev_posn = 0;
 229         char range[RANGE_HEADER_SIZE];
 230         struct curl_slist *range_header = NULL;
 231         struct active_request_slot *slot;
 232
 233         filename = sha1_file_name(request->obj->sha1);
 234         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 235         snprintf(request->tmpfile, sizeof(request->tmpfile),
 236                  "%s.temp", filename);
 237
 238         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 239         unlink(prevfile);
 240         rename(request->tmpfile, prevfile);
 241         unlink(request->tmpfile);
 242
 243         if (request->local_fileno != -1)
 244                 error("fd leakage in start: %d", request->local_fileno);
 245         request->local_fileno = open(request->tmpfile,
 246                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 247         /* This could have failed due to the "lazy directory creation";
 248          * try to mkdir the last path component.
 249          */
 250         if (request->local_fileno < 0 && errno == ENOENT) {
 251                 char *dir = strrchr(request->tmpfile, '/');
 252                 if (dir) {
 253                         *dir = 0;
 254                         mkdir(request->tmpfile, 0777);
 255                         *dir = '/';
 256                 }
 257                 request->local_fileno = open(request->tmpfile,
 258                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 259         }
 260
 261         if (request->local_fileno < 0) {
 262                 request->state = ABORTED;
 263                 error("Couldn't create temporary file %s for %s: %s",
 264                       request->tmpfile, request->filename, strerror(errno));
 265                 return;
 266         }
 267
 268         memset(&request->stream, 0, sizeof(request->stream));
 269
 270         inflateInit(&request->stream);
 271
 272         SHA1_Init(&request->c);
 273
 274         url = xmalloc(strlen(remote->url) + 50);
 275         request->url = xmalloc(strlen(remote->url) + 50);
 276         strcpy(url, remote->url);
 277         posn = url + strlen(remote->url);
 278         strcpy(posn, "objects/");
 279         posn += 8;
 280         memcpy(posn, hex, 2);
 281         posn += 2;
 282         *(posn++) = '/';
 283         strcpy(posn, hex + 2);
 284         strcpy(request->url, url);
 285
 286         /* If a previous temp file is present, process what was already
 287            fetched. */
 288         prevlocal = open(prevfile, O_RDONLY);
 289         if (prevlocal != -1) {
 290                 do {
 291                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 292                         if (prev_read>0) {
 293                                 if (fwrite_sha1_file(prev_buf,
 294                                                      1,
 295                                                      prev_read,
 296                                                      request) == prev_read) {
 297                                         prev_posn += prev_read;
 298                                 } else {
 299                                         prev_read = -1;
 300                                 }
 301                         }
 302                 } while (prev_read > 0);
 303                 close(prevlocal);
 304         }
 305         unlink(prevfile);
 306
 307         /* Reset inflate/SHA1 if there was an error reading the previous temp
 308            file; also rewind to the beginning of the local file. */
 309         if (prev_read == -1) {
 310                 memset(&request->stream, 0, sizeof(request->stream));
 311                 inflateInit(&request->stream);
 312                 SHA1_Init(&request->c);
 313                 if (prev_posn>0) {
 314                         prev_posn = 0;
 315                         lseek(request->local_fileno, SEEK_SET, 0);
 316                         ftruncate(request->local_fileno, 0);
 317                 }
 318         }
 319
 320         slot = get_active_slot();
 321         slot->callback_func = process_response;
 322         slot->callback_data = request;
 323         request->slot = slot;
 324
 325         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 326         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 327         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 328         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 329         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 330
 331         /* If we have successfully processed data from a previous fetch
 332            attempt, only fetch the data we don't already have. */
 333         if (prev_posn>0) {
 334                 if (push_verbosely)
 335                         fprintf(stderr,
 336                                 "Resuming fetch of object %s at byte %ld\n",
 337                                 hex, prev_posn);
 338                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 339                 range_header = curl_slist_append(range_header, range);
 340                 curl_easy_setopt(slot->curl,
 341                                  CURLOPT_HTTPHEADER, range_header);
 342         }
 343
 344         /* Try to get the request started, abort the request on error */
 345         request->state = RUN_FETCH_LOOSE;
 346         if (!start_active_slot(slot)) {
 347                 fprintf(stderr, "Unable to start GET request\n");
 348                 remote->can_update_info_refs = 0;
 349                 release_request(request);
 350         }
 351 }
 352
 353 static void start_mkcol(struct transfer_request *request)
 354 {
 355         char *hex = sha1_to_hex(request->obj->sha1);
 356         struct active_request_slot *slot;
 357         char *posn;
 358
 359         request->url = xmalloc(strlen(remote->url) + 13);
 360         strcpy(request->url, remote->url);
 361         posn = request->url + strlen(remote->url);
 362         strcpy(posn, "objects/");
 363         posn += 8;
 364         memcpy(posn, hex, 2);
 365         posn += 2;
 366         strcpy(posn, "/");
 367
 368         slot = get_active_slot();
 369         slot->callback_func = process_response;
 370         slot->callback_data = request;
 371         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 372         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 373         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 374         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 375         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 376
 377         if (start_active_slot(slot)) {
 378                 request->slot = slot;
 379                 request->state = RUN_MKCOL;
 380         } else {
 381                 request->state = ABORTED;
 382                 free(request->url);
 383                 request->url = NULL;
 384         }
 385 }
 386 #endif
 387
 388 static void start_fetch_packed(struct transfer_request *request)
 389 {
 390         char *url;
 391         struct packed_git *target;
 392         FILE *packfile;
 393         char *filename;
 394         long prev_posn = 0;
 395         char range[RANGE_HEADER_SIZE];
 396         struct curl_slist *range_header = NULL;
 397
 398         struct transfer_request *check_request = request_queue_head;
 399         struct active_request_slot *slot;
 400
 401         target = find_sha1_pack(request->obj->sha1, remote->packs);
 402         if (!target) {
 403                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 404                 remote->can_update_info_refs = 0;
 405                 release_request(request);
 406                 return;
 407         }
 408
 409         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 410         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 411
 412         filename = sha1_pack_name(target->sha1);
 413         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 414         snprintf(request->tmpfile, sizeof(request->tmpfile),
 415                  "%s.temp", filename);
 416
 417         url = xmalloc(strlen(remote->url) + 64);
 418         sprintf(url, "%sobjects/pack/pack-%s.pack",
 419                 remote->url, sha1_to_hex(target->sha1));
 420
 421         /* Make sure there isn't another open request for this pack */
 422         while (check_request) {
 423                 if (check_request->state == RUN_FETCH_PACKED &&
 424                     !strcmp(check_request->url, url)) {
 425                         free(url);
 426                         release_request(request);
 427                         return;
 428                 }
 429                 check_request = check_request->next;
 430         }
 431
 432         packfile = fopen(request->tmpfile, "a");
 433         if (!packfile) {
 434                 fprintf(stderr, "Unable to open local file %s for pack",
 435                         filename);
 436                 remote->can_update_info_refs = 0;
 437                 free(url);
 438                 return;
 439         }
 440
 441         slot = get_active_slot();
 442         slot->callback_func = process_response;
 443         slot->callback_data = request;
 444         request->slot = slot;
 445         request->local_stream = packfile;
 446         request->userData = target;
 447
 448         request->url = url;
 449         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 450         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 451         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 452         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 453         slot->local = packfile;
 454
 455         /* If there is data present from a previous transfer attempt,
 456            resume where it left off */
 457         prev_posn = ftell(packfile);
 458         if (prev_posn>0) {
 459                 if (push_verbosely)
 460                         fprintf(stderr,
 461                                 "Resuming fetch of pack %s at byte %ld\n",
 462                                 sha1_to_hex(target->sha1), prev_posn);
 463                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 464                 range_header = curl_slist_append(range_header, range);
 465                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 466         }
 467
 468         /* Try to get the request started, abort the request on error */
 469         request->state = RUN_FETCH_PACKED;
 470         if (!start_active_slot(slot)) {
 471                 fprintf(stderr, "Unable to start GET request\n");
 472                 remote->can_update_info_refs = 0;
 473                 release_request(request);
 474         }
 475 }
 476
 477 static void start_put(struct transfer_request *request)
 478 {
 479         char *hex = sha1_to_hex(request->obj->sha1);
 480         struct active_request_slot *slot;
 481         char *posn;
 482         char type[20];
 483         char hdr[50];
 484         void *unpacked;
 485         unsigned long len;
 486         int hdrlen;
 487         ssize_t size;
 488         z_stream stream;
 489
 490         unpacked = read_sha1_file(request->obj->sha1, type, &len);
 491         hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 492
 493         /* Set it up */
 494         memset(&stream, 0, sizeof(stream));
 495         deflateInit(&stream, zlib_compression_level);
 496         size = deflateBound(&stream, len + hdrlen);
 497         request->buffer.buffer = xmalloc(size);
 498
 499         /* Compress it */
 500         stream.next_out = request->buffer.buffer;
 501         stream.avail_out = size;
 502
 503         /* First header.. */
 504         stream.next_in = (void *)hdr;
 505         stream.avail_in = hdrlen;
 506         while (deflate(&stream, 0) == Z_OK)
 507                 /* nothing */;
 508
 509         /* Then the data itself.. */
 510         stream.next_in = unpacked;
 511         stream.avail_in = len;
 512         while (deflate(&stream, Z_FINISH) == Z_OK)
 513                 /* nothing */;
 514         deflateEnd(&stream);
 515         free(unpacked);
 516
 517         request->buffer.size = stream.total_out;
 518         request->buffer.posn = 0;
 519
 520         request->url = xmalloc(strlen(remote->url) +
 521                                strlen(request->lock->token) + 51);
 522         strcpy(request->url, remote->url);
 523         posn = request->url + strlen(remote->url);
 524         strcpy(posn, "objects/");
 525         posn += 8;
 526         memcpy(posn, hex, 2);
 527         posn += 2;
 528         *(posn++) = '/';
 529         strcpy(posn, hex + 2);
 530         request->dest = xmalloc(strlen(request->url) + 14);
 531         sprintf(request->dest, "Destination: %s", request->url);
 532         posn += 38;
 533         *(posn++) = '_';
 534         strcpy(posn, request->lock->token);
 535
 536         slot = get_active_slot();
 537         slot->callback_func = process_response;
 538         slot->callback_data = request;
 539         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 540         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 541         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 542         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 543         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 544         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 545         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 546         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 547         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 548
 549         if (start_active_slot(slot)) {
 550                 request->slot = slot;
 551                 request->state = RUN_PUT;
 552         } else {
 553                 request->state = ABORTED;
 554                 free(request->url);
 555                 request->url = NULL;
 556         }
 557 }
 558
 559 static void start_move(struct transfer_request *request)
 560 {
 561         struct active_request_slot *slot;
 562         struct curl_slist *dav_headers = NULL;
 563
 564         slot = get_active_slot();
 565         slot->callback_func = process_response;
 566         slot->callback_data = request;
 567         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 568         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 569         dav_headers = curl_slist_append(dav_headers, request->dest);
 570         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 571         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 572         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 573         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 574
 575         if (start_active_slot(slot)) {
 576                 request->slot = slot;
 577                 request->state = RUN_MOVE;
 578         } else {
 579                 request->state = ABORTED;
 580                 free(request->url);
 581                 request->url = NULL;
 582         }
 583 }
 584
 585 static int refresh_lock(struct remote_lock *lock)
 586 {
 587         struct active_request_slot *slot;
 588         struct slot_results results;
 589         char *if_header;
 590         char timeout_header[25];
 591         struct curl_slist *dav_headers = NULL;
 592         int rc = 0;
 593
 594         lock->refreshing = 1;
 595
 596         if_header = xmalloc(strlen(lock->token) + 25);
 597         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 598         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 599         dav_headers = curl_slist_append(dav_headers, if_header);
 600         dav_headers = curl_slist_append(dav_headers, timeout_header);
 601
 602         slot = get_active_slot();
 603         slot->results = &results;
 604         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 605         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 606         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 607         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 608         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 609
 610         if (start_active_slot(slot)) {
 611                 run_active_slot(slot);
 612                 if (results.curl_result != CURLE_OK) {
 613                         fprintf(stderr, "LOCK HTTP error %ld\n",
 614                                 results.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 check_locks(void)
 629 {
 630         struct remote_lock *lock = remote->locks;
 631         time_t current_time = time(NULL);
 632         int time_remaining;
 633
 634         while (lock) {
 635                 time_remaining = lock->start_time + lock->timeout -
 636                         current_time;
 637                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 638                         if (!refresh_lock(lock)) {
 639                                 fprintf(stderr,
 640                                         "Unable to refresh lock for %s\n",
 641                                         lock->url);
 642                                 aborted = 1;
 643                                 return;
 644                         }
 645                 }
 646                 lock = lock->next;
 647         }
 648 }
 649
 650 static void release_request(struct transfer_request *request)
 651 {
 652         struct transfer_request *entry = request_queue_head;
 653
 654         if (request == request_queue_head) {
 655                 request_queue_head = request->next;
 656         } else {
 657                 while (entry->next != NULL && entry->next != request)
 658                         entry = entry->next;
 659                 if (entry->next == request)
 660                         entry->next = entry->next->next;
 661         }
 662
 663         if (request->local_fileno != -1)
 664                 close(request->local_fileno);
 665         if (request->local_stream)
 666                 fclose(request->local_stream);
 667         if (request->url != NULL)
 668                 free(request->url);
 669         free(request);
 670 }
 671
 672 static void finish_request(struct transfer_request *request)
 673 {
 674         struct stat st;
 675         struct packed_git *target;
 676         struct packed_git **lst;
 677
 678         request->curl_result = request->slot->curl_result;
 679         request->http_code = request->slot->http_code;
 680         request->slot = NULL;
 681
 682         /* Keep locks active */
 683         check_locks();
 684
 685         if (request->headers != NULL)
 686                 curl_slist_free_all(request->headers);
 687
 688         /* URL is reused for MOVE after PUT */
 689         if (request->state != RUN_PUT) {
 690                 free(request->url);
 691                 request->url = NULL;
 692         }
 693
 694         if (request->state == RUN_MKCOL) {
 695                 if (request->curl_result == CURLE_OK ||
 696                     request->http_code == 405) {
 697                         remote_dir_exists[request->obj->sha1[0]] = 1;
 698                         start_put(request);
 699                 } else {
 700                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 701                                 sha1_to_hex(request->obj->sha1),
 702                                 request->curl_result, request->http_code);
 703                         request->state = ABORTED;
 704                         aborted = 1;
 705                 }
 706         } else if (request->state == RUN_PUT) {
 707                 if (request->curl_result == CURLE_OK) {
 708                         start_move(request);
 709                 } else {
 710                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 711                                 sha1_to_hex(request->obj->sha1),
 712                                 request->curl_result, request->http_code);
 713                         request->state = ABORTED;
 714                         aborted = 1;
 715                 }
 716         } else if (request->state == RUN_MOVE) {
 717                 if (request->curl_result == CURLE_OK) {
 718                         if (push_verbosely)
 719                                 fprintf(stderr, "    sent %s\n",
 720                                         sha1_to_hex(request->obj->sha1));
 721                         request->obj->flags |= REMOTE;
 722                         release_request(request);
 723                 } else {
 724                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 725                                 sha1_to_hex(request->obj->sha1),
 726                                 request->curl_result, request->http_code);
 727                         request->state = ABORTED;
 728                         aborted = 1;
 729                 }
 730         } else if (request->state == RUN_FETCH_LOOSE) {
 731                 fchmod(request->local_fileno, 0444);
 732                 close(request->local_fileno); request->local_fileno = -1;
 733
 734                 if (request->curl_result != CURLE_OK &&
 735                     request->http_code != 416) {
 736                         if (stat(request->tmpfile, &st) == 0) {
 737                                 if (st.st_size == 0)
 738                                         unlink(request->tmpfile);
 739                         }
 740                 } else {
 741                         if (request->http_code == 416)
 742                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 743
 744                         inflateEnd(&request->stream);
 745                         SHA1_Final(request->real_sha1, &request->c);
 746                         if (request->zret != Z_STREAM_END) {
 747                                 unlink(request->tmpfile);
 748                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 749                                 unlink(request->tmpfile);
 750                         } else {
 751                                 request->rename =
 752                                         move_temp_to_file(
 753                                                 request->tmpfile,
 754                                                 request->filename);
 755                                 if (request->rename == 0) {
 756                                         request->obj->flags |= (LOCAL | REMOTE);
 757                                 }
 758                         }
 759                 }
 760
 761                 /* Try fetching packed if necessary */
 762                 if (request->obj->flags & LOCAL)
 763                         release_request(request);
 764                 else
 765                         start_fetch_packed(request);
 766
 767         } else if (request->state == RUN_FETCH_PACKED) {
 768                 if (request->curl_result != CURLE_OK) {
 769                         fprintf(stderr, "Unable to get pack file %s\n%s",
 770                                 request->url, curl_errorstr);
 771                         remote->can_update_info_refs = 0;
 772                 } else {
 773                         off_t pack_size = ftell(request->local_stream);
 774
 775                         fclose(request->local_stream);
 776                         request->local_stream = NULL;
 777                         if (!move_temp_to_file(request->tmpfile,
 778                                                request->filename)) {
 779                                 target = (struct packed_git *)request->userData;
 780                                 target->pack_size = pack_size;
 781                                 lst = &remote->packs;
 782                                 while (*lst != target)
 783                                         lst = &((*lst)->next);
 784                                 *lst = (*lst)->next;
 785
 786                                 if (!verify_pack(target, 0))
 787                                         install_packed_git(target);
 788                                 else
 789                                         remote->can_update_info_refs = 0;
 790                         }
 791                 }
 792                 release_request(request);
 793         }
 794 }
 795
 796 #ifdef USE_CURL_MULTI
 797 void fill_active_slots(void)
 798 {
 799         struct transfer_request *request = request_queue_head;
 800         struct transfer_request *next;
 801         struct active_request_slot *slot = active_queue_head;
 802         int num_transfers;
 803
 804         if (aborted)
 805                 return;
 806
 807         while (active_requests < max_requests && request != NULL) {
 808                 next = request->next;
 809                 if (request->state == NEED_FETCH) {
 810                         start_fetch_loose(request);
 811                 } else if (pushing && request->state == NEED_PUSH) {
 812                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 813                                 start_put(request);
 814                         } else {
 815                                 start_mkcol(request);
 816                         }
 817                         curl_multi_perform(curlm, &num_transfers);
 818                 }
 819                 request = next;
 820         }
 821
 822         while (slot != NULL) {
 823                 if (!slot->in_use && slot->curl != NULL) {
 824                         curl_easy_cleanup(slot->curl);
 825                         slot->curl = NULL;
 826                 }
 827                 slot = slot->next;
 828         }
 829 }
 830 #endif
 831
 832 static void get_remote_object_list(unsigned char parent);
 833
 834 static void add_fetch_request(struct object *obj)
 835 {
 836         struct transfer_request *request;
 837
 838         check_locks();
 839
 840         /*
 841          * Don't fetch the object if it's known to exist locally
 842          * or is already in the request queue
 843          */
 844         if (remote_dir_exists[obj->sha1[0]] == -1)
 845                 get_remote_object_list(obj->sha1[0]);
 846         if (obj->flags & (LOCAL | FETCHING))
 847                 return;
 848
 849         obj->flags |= FETCHING;
 850         request = xmalloc(sizeof(*request));
 851         request->obj = obj;
 852         request->url = NULL;
 853         request->lock = NULL;
 854         request->headers = NULL;
 855         request->local_fileno = -1;
 856         request->local_stream = NULL;
 857         request->state = NEED_FETCH;
 858         request->next = request_queue_head;
 859         request_queue_head = request;
 860
 861 #ifdef USE_CURL_MULTI
 862         fill_active_slots();
 863         step_active_slots();
 864 #endif
 865 }
 866
 867 static int add_send_request(struct object *obj, struct remote_lock *lock)
 868 {
 869         struct transfer_request *request = request_queue_head;
 870         struct packed_git *target;
 871
 872         /* Keep locks active */
 873         check_locks();
 874
 875         /*
 876          * Don't push the object if it's known to exist on the remote
 877          * or is already in the request queue
 878          */
 879         if (remote_dir_exists[obj->sha1[0]] == -1)
 880                 get_remote_object_list(obj->sha1[0]);
 881         if (obj->flags & (REMOTE | PUSHING))
 882                 return 0;
 883         target = find_sha1_pack(obj->sha1, remote->packs);
 884         if (target) {
 885                 obj->flags |= REMOTE;
 886                 return 0;
 887         }
 888
 889         obj->flags |= PUSHING;
 890         request = xmalloc(sizeof(*request));
 891         request->obj = obj;
 892         request->url = NULL;
 893         request->lock = lock;
 894         request->headers = NULL;
 895         request->local_fileno = -1;
 896         request->local_stream = NULL;
 897         request->state = NEED_PUSH;
 898         request->next = request_queue_head;
 899         request_queue_head = request;
 900
 901 #ifdef USE_CURL_MULTI
 902         fill_active_slots();
 903         step_active_slots();
 904 #endif
 905
 906         return 1;
 907 }
 908
 909 static int fetch_index(unsigned char *sha1)
 910 {
 911         char *hex = sha1_to_hex(sha1);
 912         char *filename;
 913         char *url;
 914         char tmpfile[PATH_MAX];
 915         long prev_posn = 0;
 916         char range[RANGE_HEADER_SIZE];
 917         struct curl_slist *range_header = NULL;
 918
 919         FILE *indexfile;
 920         struct active_request_slot *slot;
 921         struct slot_results results;
 922
 923         /* Don't use the index if the pack isn't there */
 924         url = xmalloc(strlen(remote->url) + 64);
 925         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 926         slot = get_active_slot();
 927         slot->results = &results;
 928         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 929         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 930         if (start_active_slot(slot)) {
 931                 run_active_slot(slot);
 932                 if (results.curl_result != CURLE_OK) {
 933                         free(url);
 934                         return error("Unable to verify pack %s is available",
 935                                      hex);
 936                 }
 937         } else {
 938                 return error("Unable to start request");
 939         }
 940
 941         if (has_pack_index(sha1))
 942                 return 0;
 943
 944         if (push_verbosely)
 945                 fprintf(stderr, "Getting index for pack %s\n", hex);
 946
 947         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 948
 949         filename = sha1_pack_index_name(sha1);
 950         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 951         indexfile = fopen(tmpfile, "a");
 952         if (!indexfile)
 953                 return error("Unable to open local file %s for pack index",
 954                              filename);
 955
 956         slot = get_active_slot();
 957         slot->results = &results;
 958         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 959         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 960         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 961         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 962         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 963         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 964         slot->local = indexfile;
 965
 966         /* If there is data present from a previous transfer attempt,
 967            resume where it left off */
 968         prev_posn = ftell(indexfile);
 969         if (prev_posn>0) {
 970                 if (push_verbosely)
 971                         fprintf(stderr,
 972                                 "Resuming fetch of index for pack %s at byte %ld\n",
 973                                 hex, prev_posn);
 974                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 975                 range_header = curl_slist_append(range_header, range);
 976                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 977         }
 978
 979         if (start_active_slot(slot)) {
 980                 run_active_slot(slot);
 981                 if (results.curl_result != CURLE_OK) {
 982                         free(url);
 983                         fclose(indexfile);
 984                         return error("Unable to get pack index %s\n%s", url,
 985                                      curl_errorstr);
 986                 }
 987         } else {
 988                 free(url);
 989                 fclose(indexfile);
 990                 return error("Unable to start request");
 991         }
 992
 993         free(url);
 994         fclose(indexfile);
 995
 996         return move_temp_to_file(tmpfile, filename);
 997 }
 998
 999 static int setup_index(unsigned char *sha1)
1000 {
1001         struct packed_git *new_pack;
1002
1003         if (fetch_index(sha1))
1004                 return -1;
1005
1006         new_pack = parse_pack_index(sha1);
1007         new_pack->next = remote->packs;
1008         remote->packs = new_pack;
1009         return 0;
1010 }
1011
1012 static int fetch_indices(void)
1013 {
1014         unsigned char sha1[20];
1015         char *url;
1016         struct buffer buffer;
1017         char *data;
1018         int i = 0;
1019
1020         struct active_request_slot *slot;
1021         struct slot_results results;
1022
1023         data = xcalloc(1, 4096);
1024         buffer.size = 4096;
1025         buffer.posn = 0;
1026         buffer.buffer = data;
1027
1028         if (push_verbosely)
1029                 fprintf(stderr, "Getting pack list\n");
1030
1031         url = xmalloc(strlen(remote->url) + 20);
1032         sprintf(url, "%sobjects/info/packs", remote->url);
1033
1034         slot = get_active_slot();
1035         slot->results = &results;
1036         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1037         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1038         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1039         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1040         if (start_active_slot(slot)) {
1041                 run_active_slot(slot);
1042                 if (results.curl_result != CURLE_OK) {
1043                         free(buffer.buffer);
1044                         free(url);
1045                         if (results.http_code == 404)
1046                                 return 0;
1047                         else
1048                                 return error("%s", curl_errorstr);
1049                 }
1050         } else {
1051                 free(buffer.buffer);
1052                 free(url);
1053                 return error("Unable to start request");
1054         }
1055         free(url);
1056
1057         data = buffer.buffer;
1058         while (i < buffer.posn) {
1059                 switch (data[i]) {
1060                 case 'P':
1061                         i++;
1062                         if (i + 52 < buffer.posn &&
1063                             !strncmp(data + i, " pack-", 6) &&
1064                             !strncmp(data + i + 46, ".pack\n", 6)) {
1065                                 get_sha1_hex(data + i + 6, sha1);
1066                                 setup_index(sha1);
1067                                 i += 51;
1068                                 break;
1069                         }
1070                 default:
1071                         while (data[i] != '\n')
1072                                 i++;
1073                 }
1074                 i++;
1075         }
1076
1077         free(buffer.buffer);
1078         return 0;
1079 }
1080
1081 static inline int needs_quote(int ch)
1082 {
1083         if (((ch >= 'A') && (ch <= 'Z'))
1084                         || ((ch >= 'a') && (ch <= 'z'))
1085                         || ((ch >= '0') && (ch <= '9'))
1086                         || (ch == '/')
1087                         || (ch == '-')
1088                         || (ch == '.'))
1089                 return 0;
1090         return 1;
1091 }
1092
1093 static inline int hex(int v)
1094 {
1095         if (v < 10) return '0' + v;
1096         else return 'A' + v - 10;
1097 }
1098
1099 static char *quote_ref_url(const char *base, const char *ref)
1100 {
1101         const char *cp;
1102         char *dp, *qref;
1103         int len, baselen, ch;
1104
1105         baselen = strlen(base);
1106         len = baselen + 1;
1107         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1108                 if (needs_quote(ch))
1109                         len += 2; /* extra two hex plus replacement % */
1110         qref = xmalloc(len);
1111         memcpy(qref, base, baselen);
1112         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1113                 if (needs_quote(ch)) {
1114                         *dp++ = '%';
1115                         *dp++ = hex((ch >> 4) & 0xF);
1116                         *dp++ = hex(ch & 0xF);
1117                 }
1118                 else
1119                         *dp++ = ch;
1120         }
1121         *dp = 0;
1122
1123         return qref;
1124 }
1125
1126 int fetch_ref(char *ref, unsigned char *sha1)
1127 {
1128         char *url;
1129         char hex[42];
1130         struct buffer buffer;
1131         char *base = remote->url;
1132         struct active_request_slot *slot;
1133         struct slot_results results;
1134         buffer.size = 41;
1135         buffer.posn = 0;
1136         buffer.buffer = hex;
1137         hex[41] = '\0';
1138
1139         url = quote_ref_url(base, ref);
1140         slot = get_active_slot();
1141         slot->results = &results;
1142         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1143         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1144         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1145         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1146         if (start_active_slot(slot)) {
1147                 run_active_slot(slot);
1148                 if (results.curl_result != CURLE_OK)
1149                         return error("Couldn't get %s for %s\n%s",
1150                                      url, ref, curl_errorstr);
1151         } else {
1152                 return error("Unable to start request");
1153         }
1154
1155         hex[40] = '\0';
1156         get_sha1_hex(hex, sha1);
1157         return 0;
1158 }
1159
1160 static void one_remote_object(const char *hex)
1161 {
1162         unsigned char sha1[20];
1163         struct object *obj;
1164
1165         if (get_sha1_hex(hex, sha1) != 0)
1166                 return;
1167
1168         obj = lookup_object(sha1);
1169         if (!obj)
1170                 obj = parse_object(sha1);
1171
1172         /* Ignore remote objects that don't exist locally */
1173         if (!obj)
1174                 return;
1175
1176         obj->flags |= REMOTE;
1177         if (!object_list_contains(objects, obj))
1178                 object_list_insert(obj, &objects);
1179 }
1180
1181 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1182 {
1183         int *lock_flags = (int *)ctx->userData;
1184
1185         if (tag_closed) {
1186                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1187                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1188                             (*lock_flags & DAV_PROP_LOCKWR)) {
1189                                 *lock_flags |= DAV_LOCK_OK;
1190                         }
1191                         *lock_flags &= DAV_LOCK_OK;
1192                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1193                         *lock_flags |= DAV_PROP_LOCKWR;
1194                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1195                         *lock_flags |= DAV_PROP_LOCKEX;
1196                 }
1197         }
1198 }
1199
1200 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1201 {
1202         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1203
1204         if (tag_closed && ctx->cdata) {
1205                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1206                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1207                         strcpy(lock->owner, ctx->cdata);
1208                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1209                         if (!strncmp(ctx->cdata, "Second-", 7))
1210                                 lock->timeout =
1211                                         strtol(ctx->cdata + 7, NULL, 10);
1212                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1213                         if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
1214                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1215                                 strcpy(lock->token, ctx->cdata + 16);
1216                         }
1217                 }
1218         }
1219 }
1220
1221 static void one_remote_ref(char *refname);
1222
1223 static void
1224 xml_start_tag(void *userData, const char *name, const char **atts)
1225 {
1226         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1227         const char *c = strchr(name, ':');
1228         int new_len;
1229
1230         if (c == NULL)
1231                 c = name;
1232         else
1233                 c++;
1234
1235         new_len = strlen(ctx->name) + strlen(c) + 2;
1236
1237         if (new_len > ctx->len) {
1238                 ctx->name = xrealloc(ctx->name, new_len);
1239                 ctx->len = new_len;
1240         }
1241         strcat(ctx->name, ".");
1242         strcat(ctx->name, c);
1243
1244         free(ctx->cdata);
1245         ctx->cdata = NULL;
1246
1247         ctx->userFunc(ctx, 0);
1248 }
1249
1250 static void
1251 xml_end_tag(void *userData, const char *name)
1252 {
1253         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1254         const char *c = strchr(name, ':');
1255         char *ep;
1256
1257         ctx->userFunc(ctx, 1);
1258
1259         if (c == NULL)
1260                 c = name;
1261         else
1262                 c++;
1263
1264         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1265         *ep = 0;
1266 }
1267
1268 static void
1269 xml_cdata(void *userData, const XML_Char *s, int len)
1270 {
1271         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1272         free(ctx->cdata);
1273         ctx->cdata = xmalloc(len + 1);
1274         /* NB: 's' is not null-terminated, can not use strlcpy here */
1275         memcpy(ctx->cdata, s, len);
1276         ctx->cdata[len] = '\0';
1277 }
1278
1279 static struct remote_lock *lock_remote(const char *path, long timeout)
1280 {
1281         struct active_request_slot *slot;
1282         struct slot_results results;
1283         struct buffer out_buffer;
1284         struct buffer in_buffer;
1285         char *out_data;
1286         char *in_data;
1287         char *url;
1288         char *ep;
1289         char timeout_header[25];
1290         struct remote_lock *lock = NULL;
1291         XML_Parser parser = XML_ParserCreate(NULL);
1292         enum XML_Status result;
1293         struct curl_slist *dav_headers = NULL;
1294         struct xml_ctx ctx;
1295
1296         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1297         sprintf(url, "%s%s", remote->url, path);
1298
1299         /* Make sure leading directories exist for the remote ref */
1300         ep = strchr(url + strlen(remote->url) + 1, '/');
1301         while (ep) {
1302                 *ep = 0;
1303                 slot = get_active_slot();
1304                 slot->results = &results;
1305                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1306                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1307                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1308                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1309                 if (start_active_slot(slot)) {
1310                         run_active_slot(slot);
1311                         if (results.curl_result != CURLE_OK &&
1312                             results.http_code != 405) {
1313                                 fprintf(stderr,
1314                                         "Unable to create branch path %s\n",
1315                                         url);
1316                                 free(url);
1317                                 return NULL;
1318                         }
1319                 } else {
1320                         fprintf(stderr, "Unable to start MKCOL request\n");
1321                         free(url);
1322                         return NULL;
1323                 }
1324                 *ep = '/';
1325                 ep = strchr(ep + 1, '/');
1326         }
1327
1328         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1329         out_data = xmalloc(out_buffer.size + 1);
1330         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1331         out_buffer.posn = 0;
1332         out_buffer.buffer = out_data;
1333
1334         in_buffer.size = 4096;
1335         in_data = xmalloc(in_buffer.size);
1336         in_buffer.posn = 0;
1337         in_buffer.buffer = in_data;
1338
1339         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1340         dav_headers = curl_slist_append(dav_headers, timeout_header);
1341         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1342
1343         slot = get_active_slot();
1344         slot->results = &results;
1345         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1346         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1347         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1348         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1349         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1350         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1351         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1352         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1353         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1354
1355         lock = xcalloc(1, sizeof(*lock));
1356         lock->timeout = -1;
1357
1358         if (start_active_slot(slot)) {
1359                 run_active_slot(slot);
1360                 if (results.curl_result == CURLE_OK) {
1361                         ctx.name = xcalloc(10, 1);
1362                         ctx.len = 0;
1363                         ctx.cdata = NULL;
1364                         ctx.userFunc = handle_new_lock_ctx;
1365                         ctx.userData = lock;
1366                         XML_SetUserData(parser, &ctx);
1367                         XML_SetElementHandler(parser, xml_start_tag,
1368                                               xml_end_tag);
1369                         XML_SetCharacterDataHandler(parser, xml_cdata);
1370                         result = XML_Parse(parser, in_buffer.buffer,
1371                                            in_buffer.posn, 1);
1372                         free(ctx.name);
1373                         if (result != XML_STATUS_OK) {
1374                                 fprintf(stderr, "XML error: %s\n",
1375                                         XML_ErrorString(
1376                                                 XML_GetErrorCode(parser)));
1377                                 lock->timeout = -1;
1378                         }
1379                 }
1380         } else {
1381                 fprintf(stderr, "Unable to start LOCK request\n");
1382         }
1383
1384         curl_slist_free_all(dav_headers);
1385         free(out_data);
1386         free(in_data);
1387
1388         if (lock->token == NULL || lock->timeout <= 0) {
1389                 if (lock->token != NULL)
1390                         free(lock->token);
1391                 if (lock->owner != NULL)
1392                         free(lock->owner);
1393                 free(url);
1394                 free(lock);
1395                 lock = NULL;
1396         } else {
1397                 lock->url = url;
1398                 lock->start_time = time(NULL);
1399                 lock->next = remote->locks;
1400                 remote->locks = lock;
1401         }
1402
1403         return lock;
1404 }
1405
1406 static int unlock_remote(struct remote_lock *lock)
1407 {
1408         struct active_request_slot *slot;
1409         struct slot_results results;
1410         struct remote_lock *prev = remote->locks;
1411         char *lock_token_header;
1412         struct curl_slist *dav_headers = NULL;
1413         int rc = 0;
1414
1415         lock_token_header = xmalloc(strlen(lock->token) + 31);
1416         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1417                 lock->token);
1418         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1419
1420         slot = get_active_slot();
1421         slot->results = &results;
1422         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1423         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1424         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1425         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1426
1427         if (start_active_slot(slot)) {
1428                 run_active_slot(slot);
1429                 if (results.curl_result == CURLE_OK)
1430                         rc = 1;
1431                 else
1432                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1433                                 results.http_code);
1434         } else {
1435                 fprintf(stderr, "Unable to start UNLOCK request\n");
1436         }
1437
1438         curl_slist_free_all(dav_headers);
1439         free(lock_token_header);
1440
1441         if (remote->locks == lock) {
1442                 remote->locks = lock->next;
1443         } else {
1444                 while (prev && prev->next != lock)
1445                         prev = prev->next;
1446                 if (prev)
1447                         prev->next = prev->next->next;
1448         }
1449
1450         if (lock->owner != NULL)
1451                 free(lock->owner);
1452         free(lock->url);
1453         free(lock->token);
1454         free(lock);
1455
1456         return rc;
1457 }
1458
1459 static void remote_ls(const char *path, int flags,
1460                       void (*userFunc)(struct remote_ls_ctx *ls),
1461                       void *userData);
1462
1463 static void process_ls_object(struct remote_ls_ctx *ls)
1464 {
1465         unsigned int *parent = (unsigned int *)ls->userData;
1466         char *path = ls->dentry_name;
1467         char *obj_hex;
1468
1469         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1470                 remote_dir_exists[*parent] = 1;
1471                 return;
1472         }
1473
1474         if (strlen(path) != 49)
1475                 return;
1476         path += 8;
1477         obj_hex = xmalloc(strlen(path));
1478         /* NB: path is not null-terminated, can not use strlcpy here */
1479         memcpy(obj_hex, path, 2);
1480         strcpy(obj_hex + 2, path + 3);
1481         one_remote_object(obj_hex);
1482         free(obj_hex);
1483 }
1484
1485 static void process_ls_ref(struct remote_ls_ctx *ls)
1486 {
1487         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1488                 fprintf(stderr, "  %s\n", ls->dentry_name);
1489                 return;
1490         }
1491
1492         if (!(ls->dentry_flags & IS_DIR))
1493                 one_remote_ref(ls->dentry_name);
1494 }
1495
1496 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1497 {
1498         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1499
1500         if (tag_closed) {
1501                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1502                         if (ls->dentry_flags & IS_DIR) {
1503                                 if (ls->flags & PROCESS_DIRS) {
1504                                         ls->userFunc(ls);
1505                                 }
1506                                 if (strcmp(ls->dentry_name, ls->path) &&
1507                                     ls->flags & RECURSIVE) {
1508                                         remote_ls(ls->dentry_name,
1509                                                   ls->flags,
1510                                                   ls->userFunc,
1511                                                   ls->userData);
1512                                 }
1513                         } else if (ls->flags & PROCESS_FILES) {
1514                                 ls->userFunc(ls);
1515                         }
1516                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1517                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1518                                                   remote->path_len + 1);
1519                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1520                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1521                         ls->dentry_flags |= IS_DIR;
1522                 }
1523         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1524                 free(ls->dentry_name);
1525                 ls->dentry_name = NULL;
1526                 ls->dentry_flags = 0;
1527         }
1528 }
1529
1530 static void remote_ls(const char *path, int flags,
1531                       void (*userFunc)(struct remote_ls_ctx *ls),
1532                       void *userData)
1533 {
1534         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1535         struct active_request_slot *slot;
1536         struct slot_results results;
1537         struct buffer in_buffer;
1538         struct buffer out_buffer;
1539         char *in_data;
1540         char *out_data;
1541         XML_Parser parser = XML_ParserCreate(NULL);
1542         enum XML_Status result;
1543         struct curl_slist *dav_headers = NULL;
1544         struct xml_ctx ctx;
1545         struct remote_ls_ctx ls;
1546
1547         ls.flags = flags;
1548         ls.path = xstrdup(path);
1549         ls.dentry_name = NULL;
1550         ls.dentry_flags = 0;
1551         ls.userData = userData;
1552         ls.userFunc = userFunc;
1553
1554         sprintf(url, "%s%s", remote->url, path);
1555
1556         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1557         out_data = xmalloc(out_buffer.size + 1);
1558         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1559         out_buffer.posn = 0;
1560         out_buffer.buffer = out_data;
1561
1562         in_buffer.size = 4096;
1563         in_data = xmalloc(in_buffer.size);
1564         in_buffer.posn = 0;
1565         in_buffer.buffer = in_data;
1566
1567         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1568         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1569
1570         slot = get_active_slot();
1571         slot->results = &results;
1572         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1573         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1574         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1575         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1576         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1577         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1578         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1579         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1580         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1581
1582         if (start_active_slot(slot)) {
1583                 run_active_slot(slot);
1584                 if (results.curl_result == CURLE_OK) {
1585                         ctx.name = xcalloc(10, 1);
1586                         ctx.len = 0;
1587                         ctx.cdata = NULL;
1588                         ctx.userFunc = handle_remote_ls_ctx;
1589                         ctx.userData = &ls;
1590                         XML_SetUserData(parser, &ctx);
1591                         XML_SetElementHandler(parser, xml_start_tag,
1592                                               xml_end_tag);
1593                         XML_SetCharacterDataHandler(parser, xml_cdata);
1594                         result = XML_Parse(parser, in_buffer.buffer,
1595                                            in_buffer.posn, 1);
1596                         free(ctx.name);
1597
1598                         if (result != XML_STATUS_OK) {
1599                                 fprintf(stderr, "XML error: %s\n",
1600                                         XML_ErrorString(
1601                                                 XML_GetErrorCode(parser)));
1602                         }
1603                 }
1604         } else {
1605                 fprintf(stderr, "Unable to start PROPFIND request\n");
1606         }
1607
1608         free(ls.path);
1609         free(url);
1610         free(out_data);
1611         free(in_buffer.buffer);
1612         curl_slist_free_all(dav_headers);
1613 }
1614
1615 static void get_remote_object_list(unsigned char parent)
1616 {
1617         char path[] = "objects/XX/";
1618         static const char hex[] = "0123456789abcdef";
1619         unsigned int val = parent;
1620
1621         path[8] = hex[val >> 4];
1622         path[9] = hex[val & 0xf];
1623         remote_dir_exists[val] = 0;
1624         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1625                   process_ls_object, &val);
1626 }
1627
1628 static int locking_available(void)
1629 {
1630         struct active_request_slot *slot;
1631         struct slot_results results;
1632         struct buffer in_buffer;
1633         struct buffer out_buffer;
1634         char *in_data;
1635         char *out_data;
1636         XML_Parser parser = XML_ParserCreate(NULL);
1637         enum XML_Status result;
1638         struct curl_slist *dav_headers = NULL;
1639         struct xml_ctx ctx;
1640         int lock_flags = 0;
1641
1642         out_buffer.size =
1643                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1644                 strlen(remote->url) - 2;
1645         out_data = xmalloc(out_buffer.size + 1);
1646         snprintf(out_data, out_buffer.size + 1,
1647                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1648         out_buffer.posn = 0;
1649         out_buffer.buffer = out_data;
1650
1651         in_buffer.size = 4096;
1652         in_data = xmalloc(in_buffer.size);
1653         in_buffer.posn = 0;
1654         in_buffer.buffer = in_data;
1655
1656         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1657         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1658
1659         slot = get_active_slot();
1660         slot->results = &results;
1661         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1662         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1663         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1664         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1665         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1666         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1667         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1668         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1669         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1670
1671         if (start_active_slot(slot)) {
1672                 run_active_slot(slot);
1673                 if (results.curl_result == CURLE_OK) {
1674                         ctx.name = xcalloc(10, 1);
1675                         ctx.len = 0;
1676                         ctx.cdata = NULL;
1677                         ctx.userFunc = handle_lockprop_ctx;
1678                         ctx.userData = &lock_flags;
1679                         XML_SetUserData(parser, &ctx);
1680                         XML_SetElementHandler(parser, xml_start_tag,
1681                                               xml_end_tag);
1682                         result = XML_Parse(parser, in_buffer.buffer,
1683                                            in_buffer.posn, 1);
1684                         free(ctx.name);
1685
1686                         if (result != XML_STATUS_OK) {
1687                                 fprintf(stderr, "XML error: %s\n",
1688                                         XML_ErrorString(
1689                                                 XML_GetErrorCode(parser)));
1690                                 lock_flags = 0;
1691                         }
1692                 }
1693         } else {
1694                 fprintf(stderr, "Unable to start PROPFIND request\n");
1695         }
1696
1697         free(out_data);
1698         free(in_buffer.buffer);
1699         curl_slist_free_all(dav_headers);
1700
1701         return lock_flags;
1702 }
1703
1704 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1705 {
1706         struct object_list *entry = xmalloc(sizeof(struct object_list));
1707         entry->item = obj;
1708         entry->next = *p;
1709         *p = entry;
1710         return &entry->next;
1711 }
1712
1713 static struct object_list **process_blob(struct blob *blob,
1714                                          struct object_list **p,
1715                                          struct name_path *path,
1716                                          const char *name)
1717 {
1718         struct object *obj = &blob->object;
1719
1720         obj->flags |= LOCAL;
1721
1722         if (obj->flags & (UNINTERESTING | SEEN))
1723                 return p;
1724
1725         obj->flags |= SEEN;
1726         return add_one_object(obj, p);
1727 }
1728
1729 static struct object_list **process_tree(struct tree *tree,
1730                                          struct object_list **p,
1731                                          struct name_path *path,
1732                                          const char *name)
1733 {
1734         struct object *obj = &tree->object;
1735         struct tree_desc desc;
1736         struct name_entry entry;
1737         struct name_path me;
1738
1739         obj->flags |= LOCAL;
1740
1741         if (obj->flags & (UNINTERESTING | SEEN))
1742                 return p;
1743         if (parse_tree(tree) < 0)
1744                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1745
1746         obj->flags |= SEEN;
1747         name = xstrdup(name);
1748         p = add_one_object(obj, p);
1749         me.up = path;
1750         me.elem = name;
1751         me.elem_len = strlen(name);
1752
1753         desc.buf = tree->buffer;
1754         desc.size = tree->size;
1755
1756         while (tree_entry(&desc, &entry)) {
1757                 if (S_ISDIR(entry.mode))
1758                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1759                 else
1760                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1761         }
1762         free(tree->buffer);
1763         tree->buffer = NULL;
1764         return p;
1765 }
1766
1767 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1768 {
1769         int i;
1770         struct commit *commit;
1771         struct object_list **p = &objects;
1772         int count = 0;
1773
1774         while ((commit = get_revision(revs)) != NULL) {
1775                 p = process_tree(commit->tree, p, NULL, "");
1776                 commit->object.flags |= LOCAL;
1777                 if (!(commit->object.flags & UNINTERESTING))
1778                         count += add_send_request(&commit->object, lock);
1779         }
1780
1781         for (i = 0; i < revs->pending.nr; i++) {
1782                 struct object_array_entry *entry = revs->pending.objects + i;
1783                 struct object *obj = entry->item;
1784                 const char *name = entry->name;
1785
1786                 if (obj->flags & (UNINTERESTING | SEEN))
1787                         continue;
1788                 if (obj->type == OBJ_TAG) {
1789                         obj->flags |= SEEN;
1790                         p = add_one_object(obj, p);
1791                         continue;
1792                 }
1793                 if (obj->type == OBJ_TREE) {
1794                         p = process_tree((struct tree *)obj, p, NULL, name);
1795                         continue;
1796                 }
1797                 if (obj->type == OBJ_BLOB) {
1798                         p = process_blob((struct blob *)obj, p, NULL, name);
1799                         continue;
1800                 }
1801                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1802         }
1803
1804         while (objects) {
1805                 if (!(objects->item->flags & UNINTERESTING))
1806                         count += add_send_request(objects->item, lock);
1807                 objects = objects->next;
1808         }
1809
1810         return count;
1811 }
1812
1813 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1814 {
1815         struct active_request_slot *slot;
1816         struct slot_results results;
1817         char *out_data;
1818         char *if_header;
1819         struct buffer out_buffer;
1820         struct curl_slist *dav_headers = NULL;
1821         int i;
1822
1823         if_header = xmalloc(strlen(lock->token) + 25);
1824         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1825         dav_headers = curl_slist_append(dav_headers, if_header);
1826
1827         out_buffer.size = 41;
1828         out_data = xmalloc(out_buffer.size + 1);
1829         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1830         if (i != out_buffer.size) {
1831                 fprintf(stderr, "Unable to initialize PUT request body\n");
1832                 return 0;
1833         }
1834         out_buffer.posn = 0;
1835         out_buffer.buffer = out_data;
1836
1837         slot = get_active_slot();
1838         slot->results = &results;
1839         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1840         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1841         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1842         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1843         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1844         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1845         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1846         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1847         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1848
1849         if (start_active_slot(slot)) {
1850                 run_active_slot(slot);
1851                 free(out_data);
1852                 free(if_header);
1853                 if (results.curl_result != CURLE_OK) {
1854                         fprintf(stderr,
1855                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1856                                 results.curl_result, results.http_code);
1857                         /* We should attempt recovery? */
1858                         return 0;
1859                 }
1860         } else {
1861                 free(out_data);
1862                 free(if_header);
1863                 fprintf(stderr, "Unable to start PUT request\n");
1864                 return 0;
1865         }
1866
1867         return 1;
1868 }
1869
1870 static struct ref *local_refs, **local_tail;
1871 static struct ref *remote_refs, **remote_tail;
1872
1873 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1874 {
1875         struct ref *ref;
1876         int len = strlen(refname) + 1;
1877         ref = xcalloc(1, sizeof(*ref) + len);
1878         hashcpy(ref->new_sha1, sha1);
1879         memcpy(ref->name, refname, len);
1880         *local_tail = ref;
1881         local_tail = &ref->next;
1882         return 0;
1883 }
1884
1885 static void one_remote_ref(char *refname)
1886 {
1887         struct ref *ref;
1888         unsigned char remote_sha1[20];
1889         struct object *obj;
1890         int len = strlen(refname) + 1;
1891
1892         if (fetch_ref(refname, remote_sha1) != 0) {
1893                 fprintf(stderr,
1894                         "Unable to fetch ref %s from %s\n",
1895                         refname, remote->url);
1896                 return;
1897         }
1898
1899         /*
1900          * Fetch a copy of the object if it doesn't exist locally - it
1901          * may be required for updating server info later.
1902          */
1903         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1904                 obj = lookup_unknown_object(remote_sha1);
1905                 if (obj) {
1906                         fprintf(stderr, "  fetch %s for %s\n",
1907                                 sha1_to_hex(remote_sha1), refname);
1908                         add_fetch_request(obj);
1909                 }
1910         }
1911
1912         ref = xcalloc(1, sizeof(*ref) + len);
1913         hashcpy(ref->old_sha1, remote_sha1);
1914         memcpy(ref->name, refname, len);
1915         *remote_tail = ref;
1916         remote_tail = &ref->next;
1917 }
1918
1919 static void get_local_heads(void)
1920 {
1921         local_tail = &local_refs;
1922         for_each_ref(one_local_ref, NULL);
1923 }
1924
1925 static void get_dav_remote_heads(void)
1926 {
1927         remote_tail = &remote_refs;
1928         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1929 }
1930
1931 static int is_zero_sha1(const unsigned char *sha1)
1932 {
1933         int i;
1934
1935         for (i = 0; i < 20; i++) {
1936                 if (*sha1++)
1937                         return 0;
1938         }
1939         return 1;
1940 }
1941
1942 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1943 {
1944         while (list) {
1945                 struct commit_list *temp = list;
1946                 temp->item->object.flags &= ~mark;
1947                 list = temp->next;
1948                 free(temp);
1949         }
1950 }
1951
1952 static int ref_newer(const unsigned char *new_sha1,
1953                      const unsigned char *old_sha1)
1954 {
1955         struct object *o;
1956         struct commit *old, *new;
1957         struct commit_list *list, *used;
1958         int found = 0;
1959
1960         /* Both new and old must be commit-ish and new is descendant of
1961          * old.  Otherwise we require --force.
1962          */
1963         o = deref_tag(parse_object(old_sha1), NULL, 0);
1964         if (!o || o->type != OBJ_COMMIT)
1965                 return 0;
1966         old = (struct commit *) o;
1967
1968         o = deref_tag(parse_object(new_sha1), NULL, 0);
1969         if (!o || o->type != OBJ_COMMIT)
1970                 return 0;
1971         new = (struct commit *) o;
1972
1973         if (parse_commit(new) < 0)
1974                 return 0;
1975
1976         used = list = NULL;
1977         commit_list_insert(new, &list);
1978         while (list) {
1979                 new = pop_most_recent_commit(&list, TMP_MARK);
1980                 commit_list_insert(new, &used);
1981                 if (new == old) {
1982                         found = 1;
1983                         break;
1984                 }
1985         }
1986         unmark_and_free(list, TMP_MARK);
1987         unmark_and_free(used, TMP_MARK);
1988         return found;
1989 }
1990
1991 static void mark_edge_parents_uninteresting(struct commit *commit)
1992 {
1993         struct commit_list *parents;
1994
1995         for (parents = commit->parents; parents; parents = parents->next) {
1996                 struct commit *parent = parents->item;
1997                 if (!(parent->object.flags & UNINTERESTING))
1998                         continue;
1999                 mark_tree_uninteresting(parent->tree);
2000         }
2001 }
2002
2003 static void mark_edges_uninteresting(struct commit_list *list)
2004 {
2005         for ( ; list; list = list->next) {
2006                 struct commit *commit = list->item;
2007
2008                 if (commit->object.flags & UNINTERESTING) {
2009                         mark_tree_uninteresting(commit->tree);
2010                         continue;
2011                 }
2012                 mark_edge_parents_uninteresting(commit);
2013         }
2014 }
2015
2016 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2017 {
2018         struct buffer *buf = (struct buffer *)ls->userData;
2019         unsigned char remote_sha1[20];
2020         struct object *o;
2021         int len;
2022         char *ref_info;
2023
2024         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2025                 fprintf(stderr,
2026                         "Unable to fetch ref %s from %s\n",
2027                         ls->dentry_name, remote->url);
2028                 aborted = 1;
2029                 return;
2030         }
2031
2032         o = parse_object(remote_sha1);
2033         if (!o) {
2034                 fprintf(stderr,
2035                         "Unable to parse object %s for remote ref %s\n",
2036                         sha1_to_hex(remote_sha1), ls->dentry_name);
2037                 aborted = 1;
2038                 return;
2039         }
2040
2041         len = strlen(ls->dentry_name) + 42;
2042         ref_info = xcalloc(len + 1, 1);
2043         sprintf(ref_info, "%s   %s\n",
2044                 sha1_to_hex(remote_sha1), ls->dentry_name);
2045         fwrite_buffer(ref_info, 1, len, buf);
2046         free(ref_info);
2047
2048         if (o->type == OBJ_TAG) {
2049                 o = deref_tag(o, ls->dentry_name, 0);
2050                 if (o) {
2051                         len = strlen(ls->dentry_name) + 45;
2052                         ref_info = xcalloc(len + 1, 1);
2053                         sprintf(ref_info, "%s   %s^{}\n",
2054                                 sha1_to_hex(o->sha1), ls->dentry_name);
2055                         fwrite_buffer(ref_info, 1, len, buf);
2056                         free(ref_info);
2057                 }
2058         }
2059 }
2060
2061 static void update_remote_info_refs(struct remote_lock *lock)
2062 {
2063         struct buffer buffer;
2064         struct active_request_slot *slot;
2065         struct slot_results results;
2066         char *if_header;
2067         struct curl_slist *dav_headers = NULL;
2068
2069         buffer.buffer = xcalloc(1, 4096);
2070         buffer.size = 4096;
2071         buffer.posn = 0;
2072         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2073                   add_remote_info_ref, &buffer);
2074         if (!aborted) {
2075                 if_header = xmalloc(strlen(lock->token) + 25);
2076                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2077                 dav_headers = curl_slist_append(dav_headers, if_header);
2078
2079                 slot = get_active_slot();
2080                 slot->results = &results;
2081                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2082                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2083                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2084                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2085                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2086                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2087                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2088                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2089                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2090
2091                 buffer.posn = 0;
2092
2093                 if (start_active_slot(slot)) {
2094                         run_active_slot(slot);
2095                         if (results.curl_result != CURLE_OK) {
2096                                 fprintf(stderr,
2097                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2098                                         results.curl_result, results.http_code);
2099                         }
2100                 }
2101                 free(if_header);
2102         }
2103         free(buffer.buffer);
2104 }
2105
2106 static int remote_exists(const char *path)
2107 {
2108         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2109         struct active_request_slot *slot;
2110         struct slot_results results;
2111
2112         sprintf(url, "%s%s", remote->url, path);
2113
2114         slot = get_active_slot();
2115         slot->results = &results;
2116         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2117         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2118
2119         if (start_active_slot(slot)) {
2120                 run_active_slot(slot);
2121                 if (results.http_code == 404)
2122                         return 0;
2123                 else if (results.curl_result == CURLE_OK)
2124                         return 1;
2125                 else
2126                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2127         } else {
2128                 fprintf(stderr, "Unable to start HEAD request\n");
2129         }
2130
2131         return -1;
2132 }
2133
2134 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2135 {
2136         char *url;
2137         struct buffer buffer;
2138         struct active_request_slot *slot;
2139         struct slot_results results;
2140
2141         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2142         sprintf(url, "%s%s", remote->url, path);
2143
2144         buffer.size = 4096;
2145         buffer.posn = 0;
2146         buffer.buffer = xmalloc(buffer.size);
2147
2148         slot = get_active_slot();
2149         slot->results = &results;
2150         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2151         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2152         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2153         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2154         if (start_active_slot(slot)) {
2155                 run_active_slot(slot);
2156                 if (results.curl_result != CURLE_OK) {
2157                         die("Couldn't get %s for remote symref\n%s",
2158                             url, curl_errorstr);
2159                 }
2160         } else {
2161                 die("Unable to start remote symref request");
2162         }
2163         free(url);
2164
2165         if (*symref != NULL)
2166                 free(*symref);
2167         *symref = NULL;
2168         hashclr(sha1);
2169
2170         if (buffer.posn == 0)
2171                 return;
2172
2173         /* If it's a symref, set the refname; otherwise try for a sha1 */
2174         if (!strncmp((char *)buffer.buffer, "ref: ", 5)) {
2175                 *symref = xmalloc(buffer.posn - 5);
2176                 memcpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6);
2177                 (*symref)[buffer.posn - 6] = '\0';
2178         } else {
2179                 get_sha1_hex(buffer.buffer, sha1);
2180         }
2181
2182         free(buffer.buffer);
2183 }
2184
2185 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2186 {
2187         struct commit *head = lookup_commit(head_sha1);
2188         struct commit *branch = lookup_commit(branch_sha1);
2189         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2190
2191         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2192 }
2193
2194 static int delete_remote_branch(char *pattern, int force)
2195 {
2196         struct ref *refs = remote_refs;
2197         struct ref *remote_ref = NULL;
2198         unsigned char head_sha1[20];
2199         char *symref = NULL;
2200         int match;
2201         int patlen = strlen(pattern);
2202         int i;
2203         struct active_request_slot *slot;
2204         struct slot_results results;
2205         char *url;
2206
2207         /* Find the remote branch(es) matching the specified branch name */
2208         for (match = 0; refs; refs = refs->next) {
2209                 char *name = refs->name;
2210                 int namelen = strlen(name);
2211                 if (namelen < patlen ||
2212                     memcmp(name + namelen - patlen, pattern, patlen))
2213                         continue;
2214                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2215                         continue;
2216                 match++;
2217                 remote_ref = refs;
2218         }
2219         if (match == 0)
2220                 return error("No remote branch matches %s", pattern);
2221         if (match != 1)
2222                 return error("More than one remote branch matches %s",
2223                              pattern);
2224
2225         /*
2226          * Remote HEAD must be a symref (not exactly foolproof; a remote
2227          * symlink to a symref will look like a symref)
2228          */
2229         fetch_symref("HEAD", &symref, head_sha1);
2230         if (!symref)
2231                 return error("Remote HEAD is not a symref");
2232
2233         /* Remote branch must not be the remote HEAD */
2234         for (i=0; symref && i<MAXDEPTH; i++) {
2235                 if (!strcmp(remote_ref->name, symref))
2236                         return error("Remote branch %s is the current HEAD",
2237                                      remote_ref->name);
2238                 fetch_symref(symref, &symref, head_sha1);
2239         }
2240
2241         /* Run extra sanity checks if delete is not forced */
2242         if (!force) {
2243                 /* Remote HEAD must resolve to a known object */
2244                 if (symref)
2245                         return error("Remote HEAD symrefs too deep");
2246                 if (is_zero_sha1(head_sha1))
2247                         return error("Unable to resolve remote HEAD");
2248                 if (!has_sha1_file(head_sha1))
2249                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2250
2251                 /* Remote branch must resolve to a known object */
2252                 if (is_zero_sha1(remote_ref->old_sha1))
2253                         return error("Unable to resolve remote branch %s",
2254                                      remote_ref->name);
2255                 if (!has_sha1_file(remote_ref->old_sha1))
2256                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2257
2258                 /* Remote branch must be an ancestor of remote HEAD */
2259                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2260                         return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern);
2261                 }
2262         }
2263
2264         /* Send delete request */
2265         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2266         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2267         sprintf(url, "%s%s", remote->url, remote_ref->name);
2268         slot = get_active_slot();
2269         slot->results = &results;
2270         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2271         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2272         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2273         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2274         if (start_active_slot(slot)) {
2275                 run_active_slot(slot);
2276                 free(url);
2277                 if (results.curl_result != CURLE_OK)
2278                         return error("DELETE request failed (%d/%ld)\n",
2279                                      results.curl_result, results.http_code);
2280         } else {
2281                 free(url);
2282                 return error("Unable to start DELETE request");
2283         }
2284
2285         return 0;
2286 }
2287
2288 int main(int argc, char **argv)
2289 {
2290         struct transfer_request *request;
2291         struct transfer_request *next_request;
2292         int nr_refspec = 0;
2293         char **refspec = NULL;
2294         struct remote_lock *ref_lock = NULL;
2295         struct remote_lock *info_ref_lock = NULL;
2296         struct rev_info revs;
2297         int delete_branch = 0;
2298         int force_delete = 0;
2299         int objects_to_send;
2300         int rc = 0;
2301         int i;
2302         int new_refs;
2303         struct ref *ref;
2304
2305         setup_git_directory();
2306
2307         remote = xcalloc(sizeof(*remote), 1);
2308
2309         argv++;
2310         for (i = 1; i < argc; i++, argv++) {
2311                 char *arg = *argv;
2312
2313                 if (*arg == '-') {
2314                         if (!strcmp(arg, "--all")) {
2315                                 push_all = 1;
2316                                 continue;
2317                         }
2318                         if (!strcmp(arg, "--force")) {
2319                                 force_all = 1;
2320                                 continue;
2321                         }
2322                         if (!strcmp(arg, "--verbose")) {
2323                                 push_verbosely = 1;
2324                                 continue;
2325                         }
2326                         if (!strcmp(arg, "-d")) {
2327                                 delete_branch = 1;
2328                                 continue;
2329                         }
2330                         if (!strcmp(arg, "-D")) {
2331                                 delete_branch = 1;
2332                                 force_delete = 1;
2333                                 continue;
2334                         }
2335                 }
2336                 if (!remote->url) {
2337                         char *path = strstr(arg, "//");
2338                         remote->url = arg;
2339                         if (path) {
2340                                 path = strchr(path+2, '/');
2341                                 if (path)
2342                                         remote->path_len = strlen(path);
2343                         }
2344                         continue;
2345                 }
2346                 refspec = argv;
2347                 nr_refspec = argc - i;
2348                 break;
2349         }
2350
2351         if (!remote->url)
2352                 usage(http_push_usage);
2353
2354         if (delete_branch && nr_refspec != 1)
2355                 die("You must specify only one branch name when deleting a remote branch");
2356
2357         memset(remote_dir_exists, -1, 256);
2358
2359         http_init();
2360
2361         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2362         default_headers = curl_slist_append(default_headers, "Range:");
2363         default_headers = curl_slist_append(default_headers, "Destination:");
2364         default_headers = curl_slist_append(default_headers, "If:");
2365         default_headers = curl_slist_append(default_headers,
2366                                             "Pragma: no-cache");
2367
2368         /* Verify DAV compliance/lock support */
2369         if (!locking_available()) {
2370                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2371                 rc = 1;
2372                 goto cleanup;
2373         }
2374
2375         /* Check whether the remote has server info files */
2376         remote->can_update_info_refs = 0;
2377         remote->has_info_refs = remote_exists("info/refs");
2378         remote->has_info_packs = remote_exists("objects/info/packs");
2379         if (remote->has_info_refs) {
2380                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2381                 if (info_ref_lock)
2382                         remote->can_update_info_refs = 1;
2383         }
2384         if (remote->has_info_packs)
2385                 fetch_indices();
2386
2387         /* Get a list of all local and remote heads to validate refspecs */
2388         get_local_heads();
2389         fprintf(stderr, "Fetching remote heads...\n");
2390         get_dav_remote_heads();
2391
2392         /* Remove a remote branch if -d or -D was specified */
2393         if (delete_branch) {
2394                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2395                         fprintf(stderr, "Unable to delete remote branch %s\n",
2396                                 refspec[0]);
2397                 goto cleanup;
2398         }
2399
2400         /* match them up */
2401         if (!remote_tail)
2402                 remote_tail = &remote_refs;
2403         if (match_refs(local_refs, remote_refs, &remote_tail,
2404                        nr_refspec, refspec, push_all))
2405                 return -1;
2406         if (!remote_refs) {
2407                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2408                 return 0;
2409         }
2410
2411         new_refs = 0;
2412         for (ref = remote_refs; ref; ref = ref->next) {
2413                 char old_hex[60], *new_hex;
2414                 const char *commit_argv[4];
2415                 int commit_argc;
2416                 char *new_sha1_hex, *old_sha1_hex;
2417
2418                 if (!ref->peer_ref)
2419                         continue;
2420                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2421                         if (push_verbosely || 1)
2422                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2423                         continue;
2424                 }
2425
2426                 if (!force_all &&
2427                     !is_zero_sha1(ref->old_sha1) &&
2428                     !ref->force) {
2429                         if (!has_sha1_file(ref->old_sha1) ||
2430                             !ref_newer(ref->peer_ref->new_sha1,
2431                                        ref->old_sha1)) {
2432                                 /* We do not have the remote ref, or
2433                                  * we know that the remote ref is not
2434                                  * an ancestor of what we are trying to
2435                                  * push.  Either way this can be losing
2436                                  * commits at the remote end and likely
2437                                  * we were not up to date to begin with.
2438                                  */
2439                                 error("remote '%s' is not a strict "
2440                                       "subset of local ref '%s'. "
2441                                       "maybe you are not up-to-date and "
2442                                       "need to pull first?",
2443                                       ref->name,
2444                                       ref->peer_ref->name);
2445                                 rc = -2;
2446                                 continue;
2447                         }
2448                 }
2449                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2450                 if (is_zero_sha1(ref->new_sha1)) {
2451                         error("cannot happen anymore");
2452                         rc = -3;
2453                         continue;
2454                 }
2455                 new_refs++;
2456                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2457                 new_hex = sha1_to_hex(ref->new_sha1);
2458
2459                 fprintf(stderr, "updating '%s'", ref->name);
2460                 if (strcmp(ref->name, ref->peer_ref->name))
2461                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2462                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2463
2464
2465                 /* Lock remote branch ref */
2466                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2467                 if (ref_lock == NULL) {
2468                         fprintf(stderr, "Unable to lock remote branch %s\n",
2469                                 ref->name);
2470                         rc = 1;
2471                         continue;
2472                 }
2473
2474                 /* Set up revision info for this refspec */
2475                 commit_argc = 3;
2476                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2477                 old_sha1_hex = NULL;
2478                 commit_argv[1] = "--objects";
2479                 commit_argv[2] = new_sha1_hex;
2480                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2481                         old_sha1_hex = xmalloc(42);
2482                         sprintf(old_sha1_hex, "^%s",
2483                                 sha1_to_hex(ref->old_sha1));
2484                         commit_argv[3] = old_sha1_hex;
2485                         commit_argc++;
2486                 }
2487                 init_revisions(&revs, setup_git_directory());
2488                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2489                 free(new_sha1_hex);
2490                 if (old_sha1_hex) {
2491                         free(old_sha1_hex);
2492                         commit_argv[1] = NULL;
2493                 }
2494
2495                 /* Generate a list of objects that need to be pushed */
2496                 pushing = 0;
2497                 prepare_revision_walk(&revs);
2498                 mark_edges_uninteresting(revs.commits);
2499                 objects_to_send = get_delta(&revs, ref_lock);
2500                 finish_all_active_slots();
2501
2502                 /* Push missing objects to remote, this would be a
2503                    convenient time to pack them first if appropriate. */
2504                 pushing = 1;
2505                 if (objects_to_send)
2506                         fprintf(stderr, "    sending %d objects\n",
2507                                 objects_to_send);
2508 #ifdef USE_CURL_MULTI
2509                 fill_active_slots();
2510 #endif
2511                 finish_all_active_slots();
2512
2513                 /* Update the remote branch if all went well */
2514                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2515                         rc = 1;
2516                         goto unlock;
2517                 }
2518
2519         unlock:
2520                 if (!rc)
2521                         fprintf(stderr, "    done\n");
2522                 unlock_remote(ref_lock);
2523                 check_locks();
2524         }
2525
2526         /* Update remote server info if appropriate */
2527         if (remote->has_info_refs && new_refs) {
2528                 if (info_ref_lock && remote->can_update_info_refs) {
2529                         fprintf(stderr, "Updating remote server info\n");
2530                         update_remote_info_refs(info_ref_lock);
2531                 } else {
2532                         fprintf(stderr, "Unable to update server info\n");
2533                 }
2534         }
2535         if (info_ref_lock)
2536                 unlock_remote(info_ref_lock);
2537
2538  cleanup:
2539         free(remote);
2540
2541         curl_slist_free_all(no_pragma_header);
2542         curl_slist_free_all(default_headers);
2543
2544         http_cleanup();
2545
2546         request = request_queue_head;
2547         while (request != NULL) {
2548                 next_request = request->next;
2549                 release_request(request);
2550                 request = next_request;
2551         }
2552
2553         return rc;
2554 }