http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.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, 0, SEEK_SET);
 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         enum object_type type;
 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", typename(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 static int fill_active_slot(void *unused)
 798 {
 799         struct transfer_request *request = request_queue_head;
 800
 801         if (aborted)
 802                 return 0;
 803
 804         for (request = request_queue_head; request; request = request->next) {
 805                 if (request->state == NEED_FETCH) {
 806                         start_fetch_loose(request);
 807                         return 1;
 808                 } else if (pushing && request->state == NEED_PUSH) {
 809                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 810                                 start_put(request);
 811                         } else {
 812                                 start_mkcol(request);
 813                         }
 814                         return 1;
 815                 }
 816         }
 817         return 0;
 818 }
 819 #endif
 820
 821 static void get_remote_object_list(unsigned char parent);
 822
 823 static void add_fetch_request(struct object *obj)
 824 {
 825         struct transfer_request *request;
 826
 827         check_locks();
 828
 829         /*
 830          * Don't fetch the object if it's known to exist locally
 831          * or is already in the request queue
 832          */
 833         if (remote_dir_exists[obj->sha1[0]] == -1)
 834                 get_remote_object_list(obj->sha1[0]);
 835         if (obj->flags & (LOCAL | FETCHING))
 836                 return;
 837
 838         obj->flags |= FETCHING;
 839         request = xmalloc(sizeof(*request));
 840         request->obj = obj;
 841         request->url = NULL;
 842         request->lock = NULL;
 843         request->headers = NULL;
 844         request->local_fileno = -1;
 845         request->local_stream = NULL;
 846         request->state = NEED_FETCH;
 847         request->next = request_queue_head;
 848         request_queue_head = request;
 849
 850 #ifdef USE_CURL_MULTI
 851         fill_active_slots();
 852         step_active_slots();
 853 #endif
 854 }
 855
 856 static int add_send_request(struct object *obj, struct remote_lock *lock)
 857 {
 858         struct transfer_request *request = request_queue_head;
 859         struct packed_git *target;
 860
 861         /* Keep locks active */
 862         check_locks();
 863
 864         /*
 865          * Don't push the object if it's known to exist on the remote
 866          * or is already in the request queue
 867          */
 868         if (remote_dir_exists[obj->sha1[0]] == -1)
 869                 get_remote_object_list(obj->sha1[0]);
 870         if (obj->flags & (REMOTE | PUSHING))
 871                 return 0;
 872         target = find_sha1_pack(obj->sha1, remote->packs);
 873         if (target) {
 874                 obj->flags |= REMOTE;
 875                 return 0;
 876         }
 877
 878         obj->flags |= PUSHING;
 879         request = xmalloc(sizeof(*request));
 880         request->obj = obj;
 881         request->url = NULL;
 882         request->lock = lock;
 883         request->headers = NULL;
 884         request->local_fileno = -1;
 885         request->local_stream = NULL;
 886         request->state = NEED_PUSH;
 887         request->next = request_queue_head;
 888         request_queue_head = request;
 889
 890 #ifdef USE_CURL_MULTI
 891         fill_active_slots();
 892         step_active_slots();
 893 #endif
 894
 895         return 1;
 896 }
 897
 898 static int fetch_index(unsigned char *sha1)
 899 {
 900         char *hex = sha1_to_hex(sha1);
 901         char *filename;
 902         char *url;
 903         char tmpfile[PATH_MAX];
 904         long prev_posn = 0;
 905         char range[RANGE_HEADER_SIZE];
 906         struct curl_slist *range_header = NULL;
 907
 908         FILE *indexfile;
 909         struct active_request_slot *slot;
 910         struct slot_results results;
 911
 912         /* Don't use the index if the pack isn't there */
 913         url = xmalloc(strlen(remote->url) + 64);
 914         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 915         slot = get_active_slot();
 916         slot->results = &results;
 917         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 918         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 919         if (start_active_slot(slot)) {
 920                 run_active_slot(slot);
 921                 if (results.curl_result != CURLE_OK) {
 922                         free(url);
 923                         return error("Unable to verify pack %s is available",
 924                                      hex);
 925                 }
 926         } else {
 927                 return error("Unable to start request");
 928         }
 929
 930         if (has_pack_index(sha1))
 931                 return 0;
 932
 933         if (push_verbosely)
 934                 fprintf(stderr, "Getting index for pack %s\n", hex);
 935
 936         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 937
 938         filename = sha1_pack_index_name(sha1);
 939         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 940         indexfile = fopen(tmpfile, "a");
 941         if (!indexfile)
 942                 return error("Unable to open local file %s for pack index",
 943                              filename);
 944
 945         slot = get_active_slot();
 946         slot->results = &results;
 947         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 948         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 949         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 950         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 951         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 952         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 953         slot->local = indexfile;
 954
 955         /* If there is data present from a previous transfer attempt,
 956            resume where it left off */
 957         prev_posn = ftell(indexfile);
 958         if (prev_posn>0) {
 959                 if (push_verbosely)
 960                         fprintf(stderr,
 961                                 "Resuming fetch of index for pack %s at byte %ld\n",
 962                                 hex, prev_posn);
 963                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 964                 range_header = curl_slist_append(range_header, range);
 965                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 966         }
 967
 968         if (start_active_slot(slot)) {
 969                 run_active_slot(slot);
 970                 if (results.curl_result != CURLE_OK) {
 971                         free(url);
 972                         fclose(indexfile);
 973                         return error("Unable to get pack index %s\n%s", url,
 974                                      curl_errorstr);
 975                 }
 976         } else {
 977                 free(url);
 978                 fclose(indexfile);
 979                 return error("Unable to start request");
 980         }
 981
 982         free(url);
 983         fclose(indexfile);
 984
 985         return move_temp_to_file(tmpfile, filename);
 986 }
 987
 988 static int setup_index(unsigned char *sha1)
 989 {
 990         struct packed_git *new_pack;
 991
 992         if (fetch_index(sha1))
 993                 return -1;
 994
 995         new_pack = parse_pack_index(sha1);
 996         new_pack->next = remote->packs;
 997         remote->packs = new_pack;
 998         return 0;
 999 }
1000
1001 static int fetch_indices(void)
1002 {
1003         unsigned char sha1[20];
1004         char *url;
1005         struct buffer buffer;
1006         char *data;
1007         int i = 0;
1008
1009         struct active_request_slot *slot;
1010         struct slot_results results;
1011
1012         data = xcalloc(1, 4096);
1013         buffer.size = 4096;
1014         buffer.posn = 0;
1015         buffer.buffer = data;
1016
1017         if (push_verbosely)
1018                 fprintf(stderr, "Getting pack list\n");
1019
1020         url = xmalloc(strlen(remote->url) + 20);
1021         sprintf(url, "%sobjects/info/packs", remote->url);
1022
1023         slot = get_active_slot();
1024         slot->results = &results;
1025         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1026         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1028         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1029         if (start_active_slot(slot)) {
1030                 run_active_slot(slot);
1031                 if (results.curl_result != CURLE_OK) {
1032                         free(buffer.buffer);
1033                         free(url);
1034                         if (results.http_code == 404)
1035                                 return 0;
1036                         else
1037                                 return error("%s", curl_errorstr);
1038                 }
1039         } else {
1040                 free(buffer.buffer);
1041                 free(url);
1042                 return error("Unable to start request");
1043         }
1044         free(url);
1045
1046         data = buffer.buffer;
1047         while (i < buffer.posn) {
1048                 switch (data[i]) {
1049                 case 'P':
1050                         i++;
1051                         if (i + 52 < buffer.posn &&
1052                             !prefixcmp(data + i, " pack-") &&
1053                             !prefixcmp(data + i + 46, ".pack\n")) {
1054                                 get_sha1_hex(data + i + 6, sha1);
1055                                 setup_index(sha1);
1056                                 i += 51;
1057                                 break;
1058                         }
1059                 default:
1060                         while (data[i] != '\n')
1061                                 i++;
1062                 }
1063                 i++;
1064         }
1065
1066         free(buffer.buffer);
1067         return 0;
1068 }
1069
1070 static inline int needs_quote(int ch)
1071 {
1072         if (((ch >= 'A') && (ch <= 'Z'))
1073                         || ((ch >= 'a') && (ch <= 'z'))
1074                         || ((ch >= '0') && (ch <= '9'))
1075                         || (ch == '/')
1076                         || (ch == '-')
1077                         || (ch == '.'))
1078                 return 0;
1079         return 1;
1080 }
1081
1082 static inline int hex(int v)
1083 {
1084         if (v < 10) return '0' + v;
1085         else return 'A' + v - 10;
1086 }
1087
1088 static char *quote_ref_url(const char *base, const char *ref)
1089 {
1090         const char *cp;
1091         char *dp, *qref;
1092         int len, baselen, ch;
1093
1094         baselen = strlen(base);
1095         len = baselen + 1;
1096         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1097                 if (needs_quote(ch))
1098                         len += 2; /* extra two hex plus replacement % */
1099         qref = xmalloc(len);
1100         memcpy(qref, base, baselen);
1101         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1102                 if (needs_quote(ch)) {
1103                         *dp++ = '%';
1104                         *dp++ = hex((ch >> 4) & 0xF);
1105                         *dp++ = hex(ch & 0xF);
1106                 }
1107                 else
1108                         *dp++ = ch;
1109         }
1110         *dp = 0;
1111
1112         return qref;
1113 }
1114
1115 int fetch_ref(char *ref, unsigned char *sha1)
1116 {
1117         char *url;
1118         char hex[42];
1119         struct buffer buffer;
1120         char *base = remote->url;
1121         struct active_request_slot *slot;
1122         struct slot_results results;
1123         buffer.size = 41;
1124         buffer.posn = 0;
1125         buffer.buffer = hex;
1126         hex[41] = '\0';
1127
1128         url = quote_ref_url(base, ref);
1129         slot = get_active_slot();
1130         slot->results = &results;
1131         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1132         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1133         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1134         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1135         if (start_active_slot(slot)) {
1136                 run_active_slot(slot);
1137                 if (results.curl_result != CURLE_OK)
1138                         return error("Couldn't get %s for %s\n%s",
1139                                      url, ref, curl_errorstr);
1140         } else {
1141                 return error("Unable to start request");
1142         }
1143
1144         hex[40] = '\0';
1145         get_sha1_hex(hex, sha1);
1146         return 0;
1147 }
1148
1149 static void one_remote_object(const char *hex)
1150 {
1151         unsigned char sha1[20];
1152         struct object *obj;
1153
1154         if (get_sha1_hex(hex, sha1) != 0)
1155                 return;
1156
1157         obj = lookup_object(sha1);
1158         if (!obj)
1159                 obj = parse_object(sha1);
1160
1161         /* Ignore remote objects that don't exist locally */
1162         if (!obj)
1163                 return;
1164
1165         obj->flags |= REMOTE;
1166         if (!object_list_contains(objects, obj))
1167                 object_list_insert(obj, &objects);
1168 }
1169
1170 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1171 {
1172         int *lock_flags = (int *)ctx->userData;
1173
1174         if (tag_closed) {
1175                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1176                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1177                             (*lock_flags & DAV_PROP_LOCKWR)) {
1178                                 *lock_flags |= DAV_LOCK_OK;
1179                         }
1180                         *lock_flags &= DAV_LOCK_OK;
1181                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1182                         *lock_flags |= DAV_PROP_LOCKWR;
1183                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1184                         *lock_flags |= DAV_PROP_LOCKEX;
1185                 }
1186         }
1187 }
1188
1189 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1190 {
1191         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1192
1193         if (tag_closed && ctx->cdata) {
1194                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1195                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1196                         strcpy(lock->owner, ctx->cdata);
1197                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1198                         if (!prefixcmp(ctx->cdata, "Second-"))
1199                                 lock->timeout =
1200                                         strtol(ctx->cdata + 7, NULL, 10);
1201                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1202                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1203                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1204                                 strcpy(lock->token, ctx->cdata + 16);
1205                         }
1206                 }
1207         }
1208 }
1209
1210 static void one_remote_ref(char *refname);
1211
1212 static void
1213 xml_start_tag(void *userData, const char *name, const char **atts)
1214 {
1215         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1216         const char *c = strchr(name, ':');
1217         int new_len;
1218
1219         if (c == NULL)
1220                 c = name;
1221         else
1222                 c++;
1223
1224         new_len = strlen(ctx->name) + strlen(c) + 2;
1225
1226         if (new_len > ctx->len) {
1227                 ctx->name = xrealloc(ctx->name, new_len);
1228                 ctx->len = new_len;
1229         }
1230         strcat(ctx->name, ".");
1231         strcat(ctx->name, c);
1232
1233         free(ctx->cdata);
1234         ctx->cdata = NULL;
1235
1236         ctx->userFunc(ctx, 0);
1237 }
1238
1239 static void
1240 xml_end_tag(void *userData, const char *name)
1241 {
1242         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1243         const char *c = strchr(name, ':');
1244         char *ep;
1245
1246         ctx->userFunc(ctx, 1);
1247
1248         if (c == NULL)
1249                 c = name;
1250         else
1251                 c++;
1252
1253         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1254         *ep = 0;
1255 }
1256
1257 static void
1258 xml_cdata(void *userData, const XML_Char *s, int len)
1259 {
1260         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1261         free(ctx->cdata);
1262         ctx->cdata = xmemdupz(s, len);
1263 }
1264
1265 static struct remote_lock *lock_remote(const char *path, long timeout)
1266 {
1267         struct active_request_slot *slot;
1268         struct slot_results results;
1269         struct buffer out_buffer;
1270         struct buffer in_buffer;
1271         char *out_data;
1272         char *in_data;
1273         char *url;
1274         char *ep;
1275         char timeout_header[25];
1276         struct remote_lock *lock = NULL;
1277         XML_Parser parser = XML_ParserCreate(NULL);
1278         enum XML_Status result;
1279         struct curl_slist *dav_headers = NULL;
1280         struct xml_ctx ctx;
1281
1282         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1283         sprintf(url, "%s%s", remote->url, path);
1284
1285         /* Make sure leading directories exist for the remote ref */
1286         ep = strchr(url + strlen(remote->url) + 1, '/');
1287         while (ep) {
1288                 *ep = 0;
1289                 slot = get_active_slot();
1290                 slot->results = &results;
1291                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1292                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1293                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1294                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1295                 if (start_active_slot(slot)) {
1296                         run_active_slot(slot);
1297                         if (results.curl_result != CURLE_OK &&
1298                             results.http_code != 405) {
1299                                 fprintf(stderr,
1300                                         "Unable to create branch path %s\n",
1301                                         url);
1302                                 free(url);
1303                                 return NULL;
1304                         }
1305                 } else {
1306                         fprintf(stderr, "Unable to start MKCOL request\n");
1307                         free(url);
1308                         return NULL;
1309                 }
1310                 *ep = '/';
1311                 ep = strchr(ep + 1, '/');
1312         }
1313
1314         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1315         out_data = xmalloc(out_buffer.size + 1);
1316         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1317         out_buffer.posn = 0;
1318         out_buffer.buffer = out_data;
1319
1320         in_buffer.size = 4096;
1321         in_data = xmalloc(in_buffer.size);
1322         in_buffer.posn = 0;
1323         in_buffer.buffer = in_data;
1324
1325         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1326         dav_headers = curl_slist_append(dav_headers, timeout_header);
1327         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1328
1329         slot = get_active_slot();
1330         slot->results = &results;
1331         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1332         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1333         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1334         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1335         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1336         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1337         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1338         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1339         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1340
1341         lock = xcalloc(1, sizeof(*lock));
1342         lock->timeout = -1;
1343
1344         if (start_active_slot(slot)) {
1345                 run_active_slot(slot);
1346                 if (results.curl_result == CURLE_OK) {
1347                         ctx.name = xcalloc(10, 1);
1348                         ctx.len = 0;
1349                         ctx.cdata = NULL;
1350                         ctx.userFunc = handle_new_lock_ctx;
1351                         ctx.userData = lock;
1352                         XML_SetUserData(parser, &ctx);
1353                         XML_SetElementHandler(parser, xml_start_tag,
1354                                               xml_end_tag);
1355                         XML_SetCharacterDataHandler(parser, xml_cdata);
1356                         result = XML_Parse(parser, in_buffer.buffer,
1357                                            in_buffer.posn, 1);
1358                         free(ctx.name);
1359                         if (result != XML_STATUS_OK) {
1360                                 fprintf(stderr, "XML error: %s\n",
1361                                         XML_ErrorString(
1362                                                 XML_GetErrorCode(parser)));
1363                                 lock->timeout = -1;
1364                         }
1365                 }
1366         } else {
1367                 fprintf(stderr, "Unable to start LOCK request\n");
1368         }
1369
1370         curl_slist_free_all(dav_headers);
1371         free(out_data);
1372         free(in_data);
1373
1374         if (lock->token == NULL || lock->timeout <= 0) {
1375                 if (lock->token != NULL)
1376                         free(lock->token);
1377                 if (lock->owner != NULL)
1378                         free(lock->owner);
1379                 free(url);
1380                 free(lock);
1381                 lock = NULL;
1382         } else {
1383                 lock->url = url;
1384                 lock->start_time = time(NULL);
1385                 lock->next = remote->locks;
1386                 remote->locks = lock;
1387         }
1388
1389         return lock;
1390 }
1391
1392 static int unlock_remote(struct remote_lock *lock)
1393 {
1394         struct active_request_slot *slot;
1395         struct slot_results results;
1396         struct remote_lock *prev = remote->locks;
1397         char *lock_token_header;
1398         struct curl_slist *dav_headers = NULL;
1399         int rc = 0;
1400
1401         lock_token_header = xmalloc(strlen(lock->token) + 31);
1402         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1403                 lock->token);
1404         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1405
1406         slot = get_active_slot();
1407         slot->results = &results;
1408         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1409         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1410         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1411         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1412
1413         if (start_active_slot(slot)) {
1414                 run_active_slot(slot);
1415                 if (results.curl_result == CURLE_OK)
1416                         rc = 1;
1417                 else
1418                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1419                                 results.http_code);
1420         } else {
1421                 fprintf(stderr, "Unable to start UNLOCK request\n");
1422         }
1423
1424         curl_slist_free_all(dav_headers);
1425         free(lock_token_header);
1426
1427         if (remote->locks == lock) {
1428                 remote->locks = lock->next;
1429         } else {
1430                 while (prev && prev->next != lock)
1431                         prev = prev->next;
1432                 if (prev)
1433                         prev->next = prev->next->next;
1434         }
1435
1436         if (lock->owner != NULL)
1437                 free(lock->owner);
1438         free(lock->url);
1439         free(lock->token);
1440         free(lock);
1441
1442         return rc;
1443 }
1444
1445 static void remote_ls(const char *path, int flags,
1446                       void (*userFunc)(struct remote_ls_ctx *ls),
1447                       void *userData);
1448
1449 static void process_ls_object(struct remote_ls_ctx *ls)
1450 {
1451         unsigned int *parent = (unsigned int *)ls->userData;
1452         char *path = ls->dentry_name;
1453         char *obj_hex;
1454
1455         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1456                 remote_dir_exists[*parent] = 1;
1457                 return;
1458         }
1459
1460         if (strlen(path) != 49)
1461                 return;
1462         path += 8;
1463         obj_hex = xmalloc(strlen(path));
1464         /* NB: path is not null-terminated, can not use strlcpy here */
1465         memcpy(obj_hex, path, 2);
1466         strcpy(obj_hex + 2, path + 3);
1467         one_remote_object(obj_hex);
1468         free(obj_hex);
1469 }
1470
1471 static void process_ls_ref(struct remote_ls_ctx *ls)
1472 {
1473         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1474                 fprintf(stderr, "  %s\n", ls->dentry_name);
1475                 return;
1476         }
1477
1478         if (!(ls->dentry_flags & IS_DIR))
1479                 one_remote_ref(ls->dentry_name);
1480 }
1481
1482 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1483 {
1484         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1485
1486         if (tag_closed) {
1487                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1488                         if (ls->dentry_flags & IS_DIR) {
1489                                 if (ls->flags & PROCESS_DIRS) {
1490                                         ls->userFunc(ls);
1491                                 }
1492                                 if (strcmp(ls->dentry_name, ls->path) &&
1493                                     ls->flags & RECURSIVE) {
1494                                         remote_ls(ls->dentry_name,
1495                                                   ls->flags,
1496                                                   ls->userFunc,
1497                                                   ls->userData);
1498                                 }
1499                         } else if (ls->flags & PROCESS_FILES) {
1500                                 ls->userFunc(ls);
1501                         }
1502                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1503                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1504                                                   remote->path_len + 1);
1505                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1506                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1507                         ls->dentry_flags |= IS_DIR;
1508                 }
1509         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1510                 free(ls->dentry_name);
1511                 ls->dentry_name = NULL;
1512                 ls->dentry_flags = 0;
1513         }
1514 }
1515
1516 static void remote_ls(const char *path, int flags,
1517                       void (*userFunc)(struct remote_ls_ctx *ls),
1518                       void *userData)
1519 {
1520         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1521         struct active_request_slot *slot;
1522         struct slot_results results;
1523         struct buffer in_buffer;
1524         struct buffer out_buffer;
1525         char *in_data;
1526         char *out_data;
1527         XML_Parser parser = XML_ParserCreate(NULL);
1528         enum XML_Status result;
1529         struct curl_slist *dav_headers = NULL;
1530         struct xml_ctx ctx;
1531         struct remote_ls_ctx ls;
1532
1533         ls.flags = flags;
1534         ls.path = xstrdup(path);
1535         ls.dentry_name = NULL;
1536         ls.dentry_flags = 0;
1537         ls.userData = userData;
1538         ls.userFunc = userFunc;
1539
1540         sprintf(url, "%s%s", remote->url, path);
1541
1542         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1543         out_data = xmalloc(out_buffer.size + 1);
1544         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1545         out_buffer.posn = 0;
1546         out_buffer.buffer = out_data;
1547
1548         in_buffer.size = 4096;
1549         in_data = xmalloc(in_buffer.size);
1550         in_buffer.posn = 0;
1551         in_buffer.buffer = in_data;
1552
1553         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1554         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1555
1556         slot = get_active_slot();
1557         slot->results = &results;
1558         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1559         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1560         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1561         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1562         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1563         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1564         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1565         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1566         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1567
1568         if (start_active_slot(slot)) {
1569                 run_active_slot(slot);
1570                 if (results.curl_result == CURLE_OK) {
1571                         ctx.name = xcalloc(10, 1);
1572                         ctx.len = 0;
1573                         ctx.cdata = NULL;
1574                         ctx.userFunc = handle_remote_ls_ctx;
1575                         ctx.userData = &ls;
1576                         XML_SetUserData(parser, &ctx);
1577                         XML_SetElementHandler(parser, xml_start_tag,
1578                                               xml_end_tag);
1579                         XML_SetCharacterDataHandler(parser, xml_cdata);
1580                         result = XML_Parse(parser, in_buffer.buffer,
1581                                            in_buffer.posn, 1);
1582                         free(ctx.name);
1583
1584                         if (result != XML_STATUS_OK) {
1585                                 fprintf(stderr, "XML error: %s\n",
1586                                         XML_ErrorString(
1587                                                 XML_GetErrorCode(parser)));
1588                         }
1589                 }
1590         } else {
1591                 fprintf(stderr, "Unable to start PROPFIND request\n");
1592         }
1593
1594         free(ls.path);
1595         free(url);
1596         free(out_data);
1597         free(in_buffer.buffer);
1598         curl_slist_free_all(dav_headers);
1599 }
1600
1601 static void get_remote_object_list(unsigned char parent)
1602 {
1603         char path[] = "objects/XX/";
1604         static const char hex[] = "0123456789abcdef";
1605         unsigned int val = parent;
1606
1607         path[8] = hex[val >> 4];
1608         path[9] = hex[val & 0xf];
1609         remote_dir_exists[val] = 0;
1610         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1611                   process_ls_object, &val);
1612 }
1613
1614 static int locking_available(void)
1615 {
1616         struct active_request_slot *slot;
1617         struct slot_results results;
1618         struct buffer in_buffer;
1619         struct buffer out_buffer;
1620         char *in_data;
1621         char *out_data;
1622         XML_Parser parser = XML_ParserCreate(NULL);
1623         enum XML_Status result;
1624         struct curl_slist *dav_headers = NULL;
1625         struct xml_ctx ctx;
1626         int lock_flags = 0;
1627
1628         out_buffer.size =
1629                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1630                 strlen(remote->url) - 2;
1631         out_data = xmalloc(out_buffer.size + 1);
1632         snprintf(out_data, out_buffer.size + 1,
1633                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1634         out_buffer.posn = 0;
1635         out_buffer.buffer = out_data;
1636
1637         in_buffer.size = 4096;
1638         in_data = xmalloc(in_buffer.size);
1639         in_buffer.posn = 0;
1640         in_buffer.buffer = in_data;
1641
1642         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1643         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1644
1645         slot = get_active_slot();
1646         slot->results = &results;
1647         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1648         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1649         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1650         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1651         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1653         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1654         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1655         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1656
1657         if (start_active_slot(slot)) {
1658                 run_active_slot(slot);
1659                 if (results.curl_result == CURLE_OK) {
1660                         ctx.name = xcalloc(10, 1);
1661                         ctx.len = 0;
1662                         ctx.cdata = NULL;
1663                         ctx.userFunc = handle_lockprop_ctx;
1664                         ctx.userData = &lock_flags;
1665                         XML_SetUserData(parser, &ctx);
1666                         XML_SetElementHandler(parser, xml_start_tag,
1667                                               xml_end_tag);
1668                         result = XML_Parse(parser, in_buffer.buffer,
1669                                            in_buffer.posn, 1);
1670                         free(ctx.name);
1671
1672                         if (result != XML_STATUS_OK) {
1673                                 fprintf(stderr, "XML error: %s\n",
1674                                         XML_ErrorString(
1675                                                 XML_GetErrorCode(parser)));
1676                                 lock_flags = 0;
1677                         }
1678                 }
1679         } else {
1680                 fprintf(stderr, "Unable to start PROPFIND request\n");
1681         }
1682
1683         free(out_data);
1684         free(in_buffer.buffer);
1685         curl_slist_free_all(dav_headers);
1686
1687         return lock_flags;
1688 }
1689
1690 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1691 {
1692         struct object_list *entry = xmalloc(sizeof(struct object_list));
1693         entry->item = obj;
1694         entry->next = *p;
1695         *p = entry;
1696         return &entry->next;
1697 }
1698
1699 static struct object_list **process_blob(struct blob *blob,
1700                                          struct object_list **p,
1701                                          struct name_path *path,
1702                                          const char *name)
1703 {
1704         struct object *obj = &blob->object;
1705
1706         obj->flags |= LOCAL;
1707
1708         if (obj->flags & (UNINTERESTING | SEEN))
1709                 return p;
1710
1711         obj->flags |= SEEN;
1712         return add_one_object(obj, p);
1713 }
1714
1715 static struct object_list **process_tree(struct tree *tree,
1716                                          struct object_list **p,
1717                                          struct name_path *path,
1718                                          const char *name)
1719 {
1720         struct object *obj = &tree->object;
1721         struct tree_desc desc;
1722         struct name_entry entry;
1723         struct name_path me;
1724
1725         obj->flags |= LOCAL;
1726
1727         if (obj->flags & (UNINTERESTING | SEEN))
1728                 return p;
1729         if (parse_tree(tree) < 0)
1730                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1731
1732         obj->flags |= SEEN;
1733         name = xstrdup(name);
1734         p = add_one_object(obj, p);
1735         me.up = path;
1736         me.elem = name;
1737         me.elem_len = strlen(name);
1738
1739         init_tree_desc(&desc, tree->buffer, tree->size);
1740
1741         while (tree_entry(&desc, &entry)) {
1742                 if (S_ISDIR(entry.mode))
1743                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1744                 else
1745                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1746         }
1747         free(tree->buffer);
1748         tree->buffer = NULL;
1749         return p;
1750 }
1751
1752 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1753 {
1754         int i;
1755         struct commit *commit;
1756         struct object_list **p = &objects;
1757         int count = 0;
1758
1759         while ((commit = get_revision(revs)) != NULL) {
1760                 p = process_tree(commit->tree, p, NULL, "");
1761                 commit->object.flags |= LOCAL;
1762                 if (!(commit->object.flags & UNINTERESTING))
1763                         count += add_send_request(&commit->object, lock);
1764         }
1765
1766         for (i = 0; i < revs->pending.nr; i++) {
1767                 struct object_array_entry *entry = revs->pending.objects + i;
1768                 struct object *obj = entry->item;
1769                 const char *name = entry->name;
1770
1771                 if (obj->flags & (UNINTERESTING | SEEN))
1772                         continue;
1773                 if (obj->type == OBJ_TAG) {
1774                         obj->flags |= SEEN;
1775                         p = add_one_object(obj, p);
1776                         continue;
1777                 }
1778                 if (obj->type == OBJ_TREE) {
1779                         p = process_tree((struct tree *)obj, p, NULL, name);
1780                         continue;
1781                 }
1782                 if (obj->type == OBJ_BLOB) {
1783                         p = process_blob((struct blob *)obj, p, NULL, name);
1784                         continue;
1785                 }
1786                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1787         }
1788
1789         while (objects) {
1790                 if (!(objects->item->flags & UNINTERESTING))
1791                         count += add_send_request(objects->item, lock);
1792                 objects = objects->next;
1793         }
1794
1795         return count;
1796 }
1797
1798 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1799 {
1800         struct active_request_slot *slot;
1801         struct slot_results results;
1802         char *out_data;
1803         char *if_header;
1804         struct buffer out_buffer;
1805         struct curl_slist *dav_headers = NULL;
1806         int i;
1807
1808         if_header = xmalloc(strlen(lock->token) + 25);
1809         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1810         dav_headers = curl_slist_append(dav_headers, if_header);
1811
1812         out_buffer.size = 41;
1813         out_data = xmalloc(out_buffer.size + 1);
1814         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1815         if (i != out_buffer.size) {
1816                 fprintf(stderr, "Unable to initialize PUT request body\n");
1817                 return 0;
1818         }
1819         out_buffer.posn = 0;
1820         out_buffer.buffer = out_data;
1821
1822         slot = get_active_slot();
1823         slot->results = &results;
1824         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1825         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1826         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1827         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1828         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1829         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1830         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1831         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1832         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1833
1834         if (start_active_slot(slot)) {
1835                 run_active_slot(slot);
1836                 free(out_data);
1837                 free(if_header);
1838                 if (results.curl_result != CURLE_OK) {
1839                         fprintf(stderr,
1840                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1841                                 results.curl_result, results.http_code);
1842                         /* We should attempt recovery? */
1843                         return 0;
1844                 }
1845         } else {
1846                 free(out_data);
1847                 free(if_header);
1848                 fprintf(stderr, "Unable to start PUT request\n");
1849                 return 0;
1850         }
1851
1852         return 1;
1853 }
1854
1855 static struct ref *local_refs, **local_tail;
1856 static struct ref *remote_refs, **remote_tail;
1857
1858 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1859 {
1860         struct ref *ref;
1861         int len = strlen(refname) + 1;
1862         ref = xcalloc(1, sizeof(*ref) + len);
1863         hashcpy(ref->new_sha1, sha1);
1864         memcpy(ref->name, refname, len);
1865         *local_tail = ref;
1866         local_tail = &ref->next;
1867         return 0;
1868 }
1869
1870 static void one_remote_ref(char *refname)
1871 {
1872         struct ref *ref;
1873         unsigned char remote_sha1[20];
1874         struct object *obj;
1875         int len = strlen(refname) + 1;
1876
1877         if (fetch_ref(refname, remote_sha1) != 0) {
1878                 fprintf(stderr,
1879                         "Unable to fetch ref %s from %s\n",
1880                         refname, remote->url);
1881                 return;
1882         }
1883
1884         /*
1885          * Fetch a copy of the object if it doesn't exist locally - it
1886          * may be required for updating server info later.
1887          */
1888         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1889                 obj = lookup_unknown_object(remote_sha1);
1890                 if (obj) {
1891                         fprintf(stderr, "  fetch %s for %s\n",
1892                                 sha1_to_hex(remote_sha1), refname);
1893                         add_fetch_request(obj);
1894                 }
1895         }
1896
1897         ref = xcalloc(1, sizeof(*ref) + len);
1898         hashcpy(ref->old_sha1, remote_sha1);
1899         memcpy(ref->name, refname, len);
1900         *remote_tail = ref;
1901         remote_tail = &ref->next;
1902 }
1903
1904 static void get_local_heads(void)
1905 {
1906         local_tail = &local_refs;
1907         for_each_ref(one_local_ref, NULL);
1908 }
1909
1910 static void get_dav_remote_heads(void)
1911 {
1912         remote_tail = &remote_refs;
1913         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1914 }
1915
1916 static int is_zero_sha1(const unsigned char *sha1)
1917 {
1918         int i;
1919
1920         for (i = 0; i < 20; i++) {
1921                 if (*sha1++)
1922                         return 0;
1923         }
1924         return 1;
1925 }
1926
1927 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1928 {
1929         while (list) {
1930                 struct commit_list *temp = list;
1931                 temp->item->object.flags &= ~mark;
1932                 list = temp->next;
1933                 free(temp);
1934         }
1935 }
1936
1937 static int ref_newer(const unsigned char *new_sha1,
1938                      const unsigned char *old_sha1)
1939 {
1940         struct object *o;
1941         struct commit *old, *new;
1942         struct commit_list *list, *used;
1943         int found = 0;
1944
1945         /* Both new and old must be commit-ish and new is descendant of
1946          * old.  Otherwise we require --force.
1947          */
1948         o = deref_tag(parse_object(old_sha1), NULL, 0);
1949         if (!o || o->type != OBJ_COMMIT)
1950                 return 0;
1951         old = (struct commit *) o;
1952
1953         o = deref_tag(parse_object(new_sha1), NULL, 0);
1954         if (!o || o->type != OBJ_COMMIT)
1955                 return 0;
1956         new = (struct commit *) o;
1957
1958         if (parse_commit(new) < 0)
1959                 return 0;
1960
1961         used = list = NULL;
1962         commit_list_insert(new, &list);
1963         while (list) {
1964                 new = pop_most_recent_commit(&list, TMP_MARK);
1965                 commit_list_insert(new, &used);
1966                 if (new == old) {
1967                         found = 1;
1968                         break;
1969                 }
1970         }
1971         unmark_and_free(list, TMP_MARK);
1972         unmark_and_free(used, TMP_MARK);
1973         return found;
1974 }
1975
1976 static void mark_edge_parents_uninteresting(struct commit *commit)
1977 {
1978         struct commit_list *parents;
1979
1980         for (parents = commit->parents; parents; parents = parents->next) {
1981                 struct commit *parent = parents->item;
1982                 if (!(parent->object.flags & UNINTERESTING))
1983                         continue;
1984                 mark_tree_uninteresting(parent->tree);
1985         }
1986 }
1987
1988 static void mark_edges_uninteresting(struct commit_list *list)
1989 {
1990         for ( ; list; list = list->next) {
1991                 struct commit *commit = list->item;
1992
1993                 if (commit->object.flags & UNINTERESTING) {
1994                         mark_tree_uninteresting(commit->tree);
1995                         continue;
1996                 }
1997                 mark_edge_parents_uninteresting(commit);
1998         }
1999 }
2000
2001 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2002 {
2003         struct buffer *buf = (struct buffer *)ls->userData;
2004         unsigned char remote_sha1[20];
2005         struct object *o;
2006         int len;
2007         char *ref_info;
2008
2009         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2010                 fprintf(stderr,
2011                         "Unable to fetch ref %s from %s\n",
2012                         ls->dentry_name, remote->url);
2013                 aborted = 1;
2014                 return;
2015         }
2016
2017         o = parse_object(remote_sha1);
2018         if (!o) {
2019                 fprintf(stderr,
2020                         "Unable to parse object %s for remote ref %s\n",
2021                         sha1_to_hex(remote_sha1), ls->dentry_name);
2022                 aborted = 1;
2023                 return;
2024         }
2025
2026         len = strlen(ls->dentry_name) + 42;
2027         ref_info = xcalloc(len + 1, 1);
2028         sprintf(ref_info, "%s   %s\n",
2029                 sha1_to_hex(remote_sha1), ls->dentry_name);
2030         fwrite_buffer(ref_info, 1, len, buf);
2031         free(ref_info);
2032
2033         if (o->type == OBJ_TAG) {
2034                 o = deref_tag(o, ls->dentry_name, 0);
2035                 if (o) {
2036                         len = strlen(ls->dentry_name) + 45;
2037                         ref_info = xcalloc(len + 1, 1);
2038                         sprintf(ref_info, "%s   %s^{}\n",
2039                                 sha1_to_hex(o->sha1), ls->dentry_name);
2040                         fwrite_buffer(ref_info, 1, len, buf);
2041                         free(ref_info);
2042                 }
2043         }
2044 }
2045
2046 static void update_remote_info_refs(struct remote_lock *lock)
2047 {
2048         struct buffer buffer;
2049         struct active_request_slot *slot;
2050         struct slot_results results;
2051         char *if_header;
2052         struct curl_slist *dav_headers = NULL;
2053
2054         buffer.buffer = xcalloc(1, 4096);
2055         buffer.size = 4096;
2056         buffer.posn = 0;
2057         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2058                   add_remote_info_ref, &buffer);
2059         if (!aborted) {
2060                 if_header = xmalloc(strlen(lock->token) + 25);
2061                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2062                 dav_headers = curl_slist_append(dav_headers, if_header);
2063
2064                 slot = get_active_slot();
2065                 slot->results = &results;
2066                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2067                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2068                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2069                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2070                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2071                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2072                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2073                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2074                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2075
2076                 buffer.posn = 0;
2077
2078                 if (start_active_slot(slot)) {
2079                         run_active_slot(slot);
2080                         if (results.curl_result != CURLE_OK) {
2081                                 fprintf(stderr,
2082                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2083                                         results.curl_result, results.http_code);
2084                         }
2085                 }
2086                 free(if_header);
2087         }
2088         free(buffer.buffer);
2089 }
2090
2091 static int remote_exists(const char *path)
2092 {
2093         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2094         struct active_request_slot *slot;
2095         struct slot_results results;
2096
2097         sprintf(url, "%s%s", remote->url, path);
2098
2099         slot = get_active_slot();
2100         slot->results = &results;
2101         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2102         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2103
2104         if (start_active_slot(slot)) {
2105                 run_active_slot(slot);
2106                 if (results.http_code == 404)
2107                         return 0;
2108                 else if (results.curl_result == CURLE_OK)
2109                         return 1;
2110                 else
2111                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2112         } else {
2113                 fprintf(stderr, "Unable to start HEAD request\n");
2114         }
2115
2116         return -1;
2117 }
2118
2119 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2120 {
2121         char *url;
2122         struct buffer buffer;
2123         struct active_request_slot *slot;
2124         struct slot_results results;
2125
2126         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2127         sprintf(url, "%s%s", remote->url, path);
2128
2129         buffer.size = 4096;
2130         buffer.posn = 0;
2131         buffer.buffer = xmalloc(buffer.size);
2132
2133         slot = get_active_slot();
2134         slot->results = &results;
2135         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2136         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2137         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2138         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2139         if (start_active_slot(slot)) {
2140                 run_active_slot(slot);
2141                 if (results.curl_result != CURLE_OK) {
2142                         die("Couldn't get %s for remote symref\n%s",
2143                             url, curl_errorstr);
2144                 }
2145         } else {
2146                 die("Unable to start remote symref request");
2147         }
2148         free(url);
2149
2150         if (*symref != NULL)
2151                 free(*symref);
2152         *symref = NULL;
2153         hashclr(sha1);
2154
2155         if (buffer.posn == 0)
2156                 return;
2157
2158         /* If it's a symref, set the refname; otherwise try for a sha1 */
2159         if (!prefixcmp((char *)buffer.buffer, "ref: ")) {
2160                 *symref = xmemdupz((char *)buffer.buffer + 5, buffer.posn - 6);
2161         } else {
2162                 get_sha1_hex(buffer.buffer, sha1);
2163         }
2164
2165         free(buffer.buffer);
2166 }
2167
2168 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2169 {
2170         struct commit *head = lookup_commit(head_sha1);
2171         struct commit *branch = lookup_commit(branch_sha1);
2172         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2173
2174         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2175 }
2176
2177 static int delete_remote_branch(char *pattern, int force)
2178 {
2179         struct ref *refs = remote_refs;
2180         struct ref *remote_ref = NULL;
2181         unsigned char head_sha1[20];
2182         char *symref = NULL;
2183         int match;
2184         int patlen = strlen(pattern);
2185         int i;
2186         struct active_request_slot *slot;
2187         struct slot_results results;
2188         char *url;
2189
2190         /* Find the remote branch(es) matching the specified branch name */
2191         for (match = 0; refs; refs = refs->next) {
2192                 char *name = refs->name;
2193                 int namelen = strlen(name);
2194                 if (namelen < patlen ||
2195                     memcmp(name + namelen - patlen, pattern, patlen))
2196                         continue;
2197                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2198                         continue;
2199                 match++;
2200                 remote_ref = refs;
2201         }
2202         if (match == 0)
2203                 return error("No remote branch matches %s", pattern);
2204         if (match != 1)
2205                 return error("More than one remote branch matches %s",
2206                              pattern);
2207
2208         /*
2209          * Remote HEAD must be a symref (not exactly foolproof; a remote
2210          * symlink to a symref will look like a symref)
2211          */
2212         fetch_symref("HEAD", &symref, head_sha1);
2213         if (!symref)
2214                 return error("Remote HEAD is not a symref");
2215
2216         /* Remote branch must not be the remote HEAD */
2217         for (i=0; symref && i<MAXDEPTH; i++) {
2218                 if (!strcmp(remote_ref->name, symref))
2219                         return error("Remote branch %s is the current HEAD",
2220                                      remote_ref->name);
2221                 fetch_symref(symref, &symref, head_sha1);
2222         }
2223
2224         /* Run extra sanity checks if delete is not forced */
2225         if (!force) {
2226                 /* Remote HEAD must resolve to a known object */
2227                 if (symref)
2228                         return error("Remote HEAD symrefs too deep");
2229                 if (is_zero_sha1(head_sha1))
2230                         return error("Unable to resolve remote HEAD");
2231                 if (!has_sha1_file(head_sha1))
2232                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2233
2234                 /* Remote branch must resolve to a known object */
2235                 if (is_zero_sha1(remote_ref->old_sha1))
2236                         return error("Unable to resolve remote branch %s",
2237                                      remote_ref->name);
2238                 if (!has_sha1_file(remote_ref->old_sha1))
2239                         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));
2240
2241                 /* Remote branch must be an ancestor of remote HEAD */
2242                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2243                         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);
2244                 }
2245         }
2246
2247         /* Send delete request */
2248         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2249         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2250         sprintf(url, "%s%s", remote->url, remote_ref->name);
2251         slot = get_active_slot();
2252         slot->results = &results;
2253         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2254         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2255         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2256         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2257         if (start_active_slot(slot)) {
2258                 run_active_slot(slot);
2259                 free(url);
2260                 if (results.curl_result != CURLE_OK)
2261                         return error("DELETE request failed (%d/%ld)\n",
2262                                      results.curl_result, results.http_code);
2263         } else {
2264                 free(url);
2265                 return error("Unable to start DELETE request");
2266         }
2267
2268         return 0;
2269 }
2270
2271 int main(int argc, char **argv)
2272 {
2273         struct transfer_request *request;
2274         struct transfer_request *next_request;
2275         int nr_refspec = 0;
2276         char **refspec = NULL;
2277         struct remote_lock *ref_lock = NULL;
2278         struct remote_lock *info_ref_lock = NULL;
2279         struct rev_info revs;
2280         int delete_branch = 0;
2281         int force_delete = 0;
2282         int objects_to_send;
2283         int rc = 0;
2284         int i;
2285         int new_refs;
2286         struct ref *ref;
2287
2288         setup_git_directory();
2289
2290         remote = xcalloc(sizeof(*remote), 1);
2291
2292         argv++;
2293         for (i = 1; i < argc; i++, argv++) {
2294                 char *arg = *argv;
2295
2296                 if (*arg == '-') {
2297                         if (!strcmp(arg, "--all")) {
2298                                 push_all = 1;
2299                                 continue;
2300                         }
2301                         if (!strcmp(arg, "--force")) {
2302                                 force_all = 1;
2303                                 continue;
2304                         }
2305                         if (!strcmp(arg, "--verbose")) {
2306                                 push_verbosely = 1;
2307                                 continue;
2308                         }
2309                         if (!strcmp(arg, "-d")) {
2310                                 delete_branch = 1;
2311                                 continue;
2312                         }
2313                         if (!strcmp(arg, "-D")) {
2314                                 delete_branch = 1;
2315                                 force_delete = 1;
2316                                 continue;
2317                         }
2318                 }
2319                 if (!remote->url) {
2320                         char *path = strstr(arg, "//");
2321                         remote->url = arg;
2322                         if (path) {
2323                                 path = strchr(path+2, '/');
2324                                 if (path)
2325                                         remote->path_len = strlen(path);
2326                         }
2327                         continue;
2328                 }
2329                 refspec = argv;
2330                 nr_refspec = argc - i;
2331                 break;
2332         }
2333
2334         if (!remote->url)
2335                 usage(http_push_usage);
2336
2337         if (delete_branch && nr_refspec != 1)
2338                 die("You must specify only one branch name when deleting a remote branch");
2339
2340         memset(remote_dir_exists, -1, 256);
2341
2342         http_init();
2343
2344         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2345         default_headers = curl_slist_append(default_headers, "Range:");
2346         default_headers = curl_slist_append(default_headers, "Destination:");
2347         default_headers = curl_slist_append(default_headers, "If:");
2348         default_headers = curl_slist_append(default_headers,
2349                                             "Pragma: no-cache");
2350
2351         /* Verify DAV compliance/lock support */
2352         if (!locking_available()) {
2353                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2354                 rc = 1;
2355                 goto cleanup;
2356         }
2357
2358         /* Check whether the remote has server info files */
2359         remote->can_update_info_refs = 0;
2360         remote->has_info_refs = remote_exists("info/refs");
2361         remote->has_info_packs = remote_exists("objects/info/packs");
2362         if (remote->has_info_refs) {
2363                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2364                 if (info_ref_lock)
2365                         remote->can_update_info_refs = 1;
2366         }
2367         if (remote->has_info_packs)
2368                 fetch_indices();
2369
2370         /* Get a list of all local and remote heads to validate refspecs */
2371         get_local_heads();
2372         fprintf(stderr, "Fetching remote heads...\n");
2373         get_dav_remote_heads();
2374
2375         /* Remove a remote branch if -d or -D was specified */
2376         if (delete_branch) {
2377                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2378                         fprintf(stderr, "Unable to delete remote branch %s\n",
2379                                 refspec[0]);
2380                 goto cleanup;
2381         }
2382
2383         /* match them up */
2384         if (!remote_tail)
2385                 remote_tail = &remote_refs;
2386         if (match_refs(local_refs, remote_refs, &remote_tail,
2387                        nr_refspec, refspec, push_all))
2388                 return -1;
2389         if (!remote_refs) {
2390                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2391                 return 0;
2392         }
2393
2394         new_refs = 0;
2395         for (ref = remote_refs; ref; ref = ref->next) {
2396                 char old_hex[60], *new_hex;
2397                 const char *commit_argv[4];
2398                 int commit_argc;
2399                 char *new_sha1_hex, *old_sha1_hex;
2400
2401                 if (!ref->peer_ref)
2402                         continue;
2403                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2404                         if (push_verbosely || 1)
2405                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2406                         continue;
2407                 }
2408
2409                 if (!force_all &&
2410                     !is_zero_sha1(ref->old_sha1) &&
2411                     !ref->force) {
2412                         if (!has_sha1_file(ref->old_sha1) ||
2413                             !ref_newer(ref->peer_ref->new_sha1,
2414                                        ref->old_sha1)) {
2415                                 /* We do not have the remote ref, or
2416                                  * we know that the remote ref is not
2417                                  * an ancestor of what we are trying to
2418                                  * push.  Either way this can be losing
2419                                  * commits at the remote end and likely
2420                                  * we were not up to date to begin with.
2421                                  */
2422                                 error("remote '%s' is not a strict "
2423                                       "subset of local ref '%s'. "
2424                                       "maybe you are not up-to-date and "
2425                                       "need to pull first?",
2426                                       ref->name,
2427                                       ref->peer_ref->name);
2428                                 rc = -2;
2429                                 continue;
2430                         }
2431                 }
2432                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2433                 if (is_zero_sha1(ref->new_sha1)) {
2434                         error("cannot happen anymore");
2435                         rc = -3;
2436                         continue;
2437                 }
2438                 new_refs++;
2439                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2440                 new_hex = sha1_to_hex(ref->new_sha1);
2441
2442                 fprintf(stderr, "updating '%s'", ref->name);
2443                 if (strcmp(ref->name, ref->peer_ref->name))
2444                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2445                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2446
2447
2448                 /* Lock remote branch ref */
2449                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2450                 if (ref_lock == NULL) {
2451                         fprintf(stderr, "Unable to lock remote branch %s\n",
2452                                 ref->name);
2453                         rc = 1;
2454                         continue;
2455                 }
2456
2457                 /* Set up revision info for this refspec */
2458                 commit_argc = 3;
2459                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2460                 old_sha1_hex = NULL;
2461                 commit_argv[1] = "--objects";
2462                 commit_argv[2] = new_sha1_hex;
2463                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2464                         old_sha1_hex = xmalloc(42);
2465                         sprintf(old_sha1_hex, "^%s",
2466                                 sha1_to_hex(ref->old_sha1));
2467                         commit_argv[3] = old_sha1_hex;
2468                         commit_argc++;
2469                 }
2470                 init_revisions(&revs, setup_git_directory());
2471                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2472                 free(new_sha1_hex);
2473                 if (old_sha1_hex) {
2474                         free(old_sha1_hex);
2475                         commit_argv[1] = NULL;
2476                 }
2477
2478                 /* Generate a list of objects that need to be pushed */
2479                 pushing = 0;
2480                 prepare_revision_walk(&revs);
2481                 mark_edges_uninteresting(revs.commits);
2482                 objects_to_send = get_delta(&revs, ref_lock);
2483                 finish_all_active_slots();
2484
2485                 /* Push missing objects to remote, this would be a
2486                    convenient time to pack them first if appropriate. */
2487                 pushing = 1;
2488                 if (objects_to_send)
2489                         fprintf(stderr, "    sending %d objects\n",
2490                                 objects_to_send);
2491 #ifdef USE_CURL_MULTI
2492                 fill_active_slots();
2493                 add_fill_function(NULL, fill_active_slot);
2494 #endif
2495                 finish_all_active_slots();
2496
2497                 /* Update the remote branch if all went well */
2498                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2499                         rc = 1;
2500                         goto unlock;
2501                 }
2502
2503         unlock:
2504                 if (!rc)
2505                         fprintf(stderr, "    done\n");
2506                 unlock_remote(ref_lock);
2507                 check_locks();
2508         }
2509
2510         /* Update remote server info if appropriate */
2511         if (remote->has_info_refs && new_refs) {
2512                 if (info_ref_lock && remote->can_update_info_refs) {
2513                         fprintf(stderr, "Updating remote server info\n");
2514                         update_remote_info_refs(info_ref_lock);
2515                 } else {
2516                         fprintf(stderr, "Unable to update server info\n");
2517                 }
2518         }
2519         if (info_ref_lock)
2520                 unlock_remote(info_ref_lock);
2521
2522  cleanup:
2523         free(remote);
2524
2525         curl_slist_free_all(no_pragma_header);
2526         curl_slist_free_all(default_headers);
2527
2528         http_cleanup();
2529
2530         request = request_queue_head;
2531         while (request != NULL) {
2532                 next_request = request->next;
2533                 release_request(request);
2534                 request = next_request;
2535         }
2536
2537         return rc;
2538 }