git.oblomov.eu Git - git/blob - 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] [--dry-run] [--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 static int dry_run;
  84
  85 static struct object_list *objects;
  86
  87 struct repo
  88 {
  89         char *url;
  90         int path_len;
  91         int has_info_refs;
  92         int can_update_info_refs;
  93         int has_info_packs;
  94         struct packed_git *packs;
  95         struct remote_lock *locks;
  96 };
  97
  98 static struct repo *remote;
  99
 100 enum transfer_state {
 101         NEED_FETCH,
 102         RUN_FETCH_LOOSE,
 103         RUN_FETCH_PACKED,
 104         NEED_PUSH,
 105         RUN_MKCOL,
 106         RUN_PUT,
 107         RUN_MOVE,
 108         ABORTED,
 109         COMPLETE,
 110 };
 111
 112 struct transfer_request
 113 {
 114         struct object *obj;
 115         char *url;
 116         char *dest;
 117         struct remote_lock *lock;
 118         struct curl_slist *headers;
 119         struct buffer buffer;
 120         char filename[PATH_MAX];
 121         char tmpfile[PATH_MAX];
 122         int local_fileno;
 123         FILE *local_stream;
 124         enum transfer_state state;
 125         CURLcode curl_result;
 126         char errorstr[CURL_ERROR_SIZE];
 127         long http_code;
 128         unsigned char real_sha1[20];
 129         SHA_CTX c;
 130         z_stream stream;
 131         int zret;
 132         int rename;
 133         void *userData;
 134         struct active_request_slot *slot;
 135         struct transfer_request *next;
 136 };
 137
 138 static struct transfer_request *request_queue_head;
 139
 140 struct xml_ctx
 141 {
 142         char *name;
 143         int len;
 144         char *cdata;
 145         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 146         void *userData;
 147 };
 148
 149 struct remote_lock
 150 {
 151         char *url;
 152         char *owner;
 153         char *token;
 154         time_t start_time;
 155         long timeout;
 156         int refreshing;
 157         struct remote_lock *next;
 158 };
 159
 160 /* Flags that control remote_ls processing */
 161 #define PROCESS_FILES (1u << 0)
 162 #define PROCESS_DIRS  (1u << 1)
 163 #define RECURSIVE     (1u << 2)
 164
 165 /* Flags that remote_ls passes to callback functions */
 166 #define IS_DIR (1u << 0)
 167
 168 struct remote_ls_ctx
 169 {
 170         char *path;
 171         void (*userFunc)(struct remote_ls_ctx *ls);
 172         void *userData;
 173         int flags;
 174         char *dentry_name;
 175         int dentry_flags;
 176         struct remote_ls_ctx *parent;
 177 };
 178
 179 static void finish_request(struct transfer_request *request);
 180 static void release_request(struct transfer_request *request);
 181
 182 static void process_response(void *callback_data)
 183 {
 184         struct transfer_request *request =
 185                 (struct transfer_request *)callback_data;
 186
 187         finish_request(request);
 188 }
 189
 190 #ifdef USE_CURL_MULTI
 191 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 192                                void *data)
 193 {
 194         unsigned char expn[4096];
 195         size_t size = eltsize * nmemb;
 196         int posn = 0;
 197         struct transfer_request *request = (struct transfer_request *)data;
 198         do {
 199                 ssize_t retval = xwrite(request->local_fileno,
 200                                        (char *) ptr + posn, size - posn);
 201                 if (retval < 0)
 202                         return posn;
 203                 posn += retval;
 204         } while (posn < size);
 205
 206         request->stream.avail_in = size;
 207         request->stream.next_in = ptr;
 208         do {
 209                 request->stream.next_out = expn;
 210                 request->stream.avail_out = sizeof(expn);
 211                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 212                 SHA1_Update(&request->c, expn,
 213                             sizeof(expn) - request->stream.avail_out);
 214         } while (request->stream.avail_in && request->zret == Z_OK);
 215         data_received++;
 216         return size;
 217 }
 218
 219 static void start_fetch_loose(struct transfer_request *request)
 220 {
 221         char *hex = sha1_to_hex(request->obj->sha1);
 222         char *filename;
 223         char prevfile[PATH_MAX];
 224         char *url;
 225         char *posn;
 226         int prevlocal;
 227         unsigned char prev_buf[PREV_BUF_SIZE];
 228         ssize_t prev_read = 0;
 229         long prev_posn = 0;
 230         char range[RANGE_HEADER_SIZE];
 231         struct curl_slist *range_header = NULL;
 232         struct active_request_slot *slot;
 233
 234         filename = sha1_file_name(request->obj->sha1);
 235         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 236         snprintf(request->tmpfile, sizeof(request->tmpfile),
 237                  "%s.temp", filename);
 238
 239         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 240         unlink(prevfile);
 241         rename(request->tmpfile, prevfile);
 242         unlink(request->tmpfile);
 243
 244         if (request->local_fileno != -1)
 245                 error("fd leakage in start: %d", request->local_fileno);
 246         request->local_fileno = open(request->tmpfile,
 247                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 248         /* This could have failed due to the "lazy directory creation";
 249          * try to mkdir the last path component.
 250          */
 251         if (request->local_fileno < 0 && errno == ENOENT) {
 252                 char *dir = strrchr(request->tmpfile, '/');
 253                 if (dir) {
 254                         *dir = 0;
 255                         mkdir(request->tmpfile, 0777);
 256                         *dir = '/';
 257                 }
 258                 request->local_fileno = open(request->tmpfile,
 259                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 260         }
 261
 262         if (request->local_fileno < 0) {
 263                 request->state = ABORTED;
 264                 error("Couldn't create temporary file %s for %s: %s",
 265                       request->tmpfile, request->filename, strerror(errno));
 266                 return;
 267         }
 268
 269         memset(&request->stream, 0, sizeof(request->stream));
 270
 271         inflateInit(&request->stream);
 272
 273         SHA1_Init(&request->c);
 274
 275         url = xmalloc(strlen(remote->url) + 50);
 276         request->url = xmalloc(strlen(remote->url) + 50);
 277         strcpy(url, remote->url);
 278         posn = url + strlen(remote->url);
 279         strcpy(posn, "objects/");
 280         posn += 8;
 281         memcpy(posn, hex, 2);
 282         posn += 2;
 283         *(posn++) = '/';
 284         strcpy(posn, hex + 2);
 285         strcpy(request->url, url);
 286
 287         /* If a previous temp file is present, process what was already
 288            fetched. */
 289         prevlocal = open(prevfile, O_RDONLY);
 290         if (prevlocal != -1) {
 291                 do {
 292                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 293                         if (prev_read>0) {
 294                                 if (fwrite_sha1_file(prev_buf,
 295                                                      1,
 296                                                      prev_read,
 297                                                      request) == prev_read) {
 298                                         prev_posn += prev_read;
 299                                 } else {
 300                                         prev_read = -1;
 301                                 }
 302                         }
 303                 } while (prev_read > 0);
 304                 close(prevlocal);
 305         }
 306         unlink(prevfile);
 307
 308         /* Reset inflate/SHA1 if there was an error reading the previous temp
 309            file; also rewind to the beginning of the local file. */
 310         if (prev_read == -1) {
 311                 memset(&request->stream, 0, sizeof(request->stream));
 312                 inflateInit(&request->stream);
 313                 SHA1_Init(&request->c);
 314                 if (prev_posn>0) {
 315                         prev_posn = 0;
 316                         lseek(request->local_fileno, 0, SEEK_SET);
 317                         ftruncate(request->local_fileno, 0);
 318                 }
 319         }
 320
 321         slot = get_active_slot();
 322         slot->callback_func = process_response;
 323         slot->callback_data = request;
 324         request->slot = slot;
 325
 326         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 327         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 328         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 329         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 330         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 331
 332         /* If we have successfully processed data from a previous fetch
 333            attempt, only fetch the data we don't already have. */
 334         if (prev_posn>0) {
 335                 if (push_verbosely)
 336                         fprintf(stderr,
 337                                 "Resuming fetch of object %s at byte %ld\n",
 338                                 hex, prev_posn);
 339                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 340                 range_header = curl_slist_append(range_header, range);
 341                 curl_easy_setopt(slot->curl,
 342                                  CURLOPT_HTTPHEADER, range_header);
 343         }
 344
 345         /* Try to get the request started, abort the request on error */
 346         request->state = RUN_FETCH_LOOSE;
 347         if (!start_active_slot(slot)) {
 348                 fprintf(stderr, "Unable to start GET request\n");
 349                 remote->can_update_info_refs = 0;
 350                 release_request(request);
 351         }
 352 }
 353
 354 static void start_mkcol(struct transfer_request *request)
 355 {
 356         char *hex = sha1_to_hex(request->obj->sha1);
 357         struct active_request_slot *slot;
 358         char *posn;
 359
 360         request->url = xmalloc(strlen(remote->url) + 13);
 361         strcpy(request->url, remote->url);
 362         posn = request->url + strlen(remote->url);
 363         strcpy(posn, "objects/");
 364         posn += 8;
 365         memcpy(posn, hex, 2);
 366         posn += 2;
 367         strcpy(posn, "/");
 368
 369         slot = get_active_slot();
 370         slot->callback_func = process_response;
 371         slot->callback_data = request;
 372         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 373         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 374         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 375         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 376         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 377
 378         if (start_active_slot(slot)) {
 379                 request->slot = slot;
 380                 request->state = RUN_MKCOL;
 381         } else {
 382                 request->state = ABORTED;
 383                 free(request->url);
 384                 request->url = NULL;
 385         }
 386 }
 387 #endif
 388
 389 static void start_fetch_packed(struct transfer_request *request)
 390 {
 391         char *url;
 392         struct packed_git *target;
 393         FILE *packfile;
 394         char *filename;
 395         long prev_posn = 0;
 396         char range[RANGE_HEADER_SIZE];
 397         struct curl_slist *range_header = NULL;
 398
 399         struct transfer_request *check_request = request_queue_head;
 400         struct active_request_slot *slot;
 401
 402         target = find_sha1_pack(request->obj->sha1, remote->packs);
 403         if (!target) {
 404                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 405                 remote->can_update_info_refs = 0;
 406                 release_request(request);
 407                 return;
 408         }
 409
 410         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 411         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 412
 413         filename = sha1_pack_name(target->sha1);
 414         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 415         snprintf(request->tmpfile, sizeof(request->tmpfile),
 416                  "%s.temp", filename);
 417
 418         url = xmalloc(strlen(remote->url) + 64);
 419         sprintf(url, "%sobjects/pack/pack-%s.pack",
 420                 remote->url, sha1_to_hex(target->sha1));
 421
 422         /* Make sure there isn't another open request for this pack */
 423         while (check_request) {
 424                 if (check_request->state == RUN_FETCH_PACKED &&
 425                     !strcmp(check_request->url, url)) {
 426                         free(url);
 427                         release_request(request);
 428                         return;
 429                 }
 430                 check_request = check_request->next;
 431         }
 432
 433         packfile = fopen(request->tmpfile, "a");
 434         if (!packfile) {
 435                 fprintf(stderr, "Unable to open local file %s for pack",
 436                         filename);
 437                 remote->can_update_info_refs = 0;
 438                 free(url);
 439                 return;
 440         }
 441
 442         slot = get_active_slot();
 443         slot->callback_func = process_response;
 444         slot->callback_data = request;
 445         request->slot = slot;
 446         request->local_stream = packfile;
 447         request->userData = target;
 448
 449         request->url = url;
 450         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 451         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 452         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 453         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 454         slot->local = packfile;
 455
 456         /* If there is data present from a previous transfer attempt,
 457            resume where it left off */
 458         prev_posn = ftell(packfile);
 459         if (prev_posn>0) {
 460                 if (push_verbosely)
 461                         fprintf(stderr,
 462                                 "Resuming fetch of pack %s at byte %ld\n",
 463                                 sha1_to_hex(target->sha1), prev_posn);
 464                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 465                 range_header = curl_slist_append(range_header, range);
 466                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 467         }
 468
 469         /* Try to get the request started, abort the request on error */
 470         request->state = RUN_FETCH_PACKED;
 471         if (!start_active_slot(slot)) {
 472                 fprintf(stderr, "Unable to start GET request\n");
 473                 remote->can_update_info_refs = 0;
 474                 release_request(request);
 475         }
 476 }
 477
 478 static void start_put(struct transfer_request *request)
 479 {
 480         char *hex = sha1_to_hex(request->obj->sha1);
 481         struct active_request_slot *slot;
 482         char *posn;
 483         enum object_type type;
 484         char hdr[50];
 485         void *unpacked;
 486         unsigned long len;
 487         int hdrlen;
 488         ssize_t size;
 489         z_stream stream;
 490
 491         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 492         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 493
 494         /* Set it up */
 495         memset(&stream, 0, sizeof(stream));
 496         deflateInit(&stream, zlib_compression_level);
 497         size = deflateBound(&stream, len + hdrlen);
 498         request->buffer.buffer = xmalloc(size);
 499
 500         /* Compress it */
 501         stream.next_out = request->buffer.buffer;
 502         stream.avail_out = size;
 503
 504         /* First header.. */
 505         stream.next_in = (void *)hdr;
 506         stream.avail_in = hdrlen;
 507         while (deflate(&stream, 0) == Z_OK)
 508                 /* nothing */;
 509
 510         /* Then the data itself.. */
 511         stream.next_in = unpacked;
 512         stream.avail_in = len;
 513         while (deflate(&stream, Z_FINISH) == Z_OK)
 514                 /* nothing */;
 515         deflateEnd(&stream);
 516         free(unpacked);
 517
 518         request->buffer.size = stream.total_out;
 519         request->buffer.posn = 0;
 520
 521         request->url = xmalloc(strlen(remote->url) +
 522                                strlen(request->lock->token) + 51);
 523         strcpy(request->url, remote->url);
 524         posn = request->url + strlen(remote->url);
 525         strcpy(posn, "objects/");
 526         posn += 8;
 527         memcpy(posn, hex, 2);
 528         posn += 2;
 529         *(posn++) = '/';
 530         strcpy(posn, hex + 2);
 531         request->dest = xmalloc(strlen(request->url) + 14);
 532         sprintf(request->dest, "Destination: %s", request->url);
 533         posn += 38;
 534         *(posn++) = '_';
 535         strcpy(posn, request->lock->token);
 536
 537         slot = get_active_slot();
 538         slot->callback_func = process_response;
 539         slot->callback_data = request;
 540         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 541         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 542         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 543         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 544         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 545         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 546         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 547         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 548         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 549
 550         if (start_active_slot(slot)) {
 551                 request->slot = slot;
 552                 request->state = RUN_PUT;
 553         } else {
 554                 request->state = ABORTED;
 555                 free(request->url);
 556                 request->url = NULL;
 557         }
 558 }
 559
 560 static void start_move(struct transfer_request *request)
 561 {
 562         struct active_request_slot *slot;
 563         struct curl_slist *dav_headers = NULL;
 564
 565         slot = get_active_slot();
 566         slot->callback_func = process_response;
 567         slot->callback_data = request;
 568         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 569         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 570         dav_headers = curl_slist_append(dav_headers, request->dest);
 571         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 572         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 573         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 574         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 575
 576         if (start_active_slot(slot)) {
 577                 request->slot = slot;
 578                 request->state = RUN_MOVE;
 579         } else {
 580                 request->state = ABORTED;
 581                 free(request->url);
 582                 request->url = NULL;
 583         }
 584 }
 585
 586 static int refresh_lock(struct remote_lock *lock)
 587 {
 588         struct active_request_slot *slot;
 589         struct slot_results results;
 590         char *if_header;
 591         char timeout_header[25];
 592         struct curl_slist *dav_headers = NULL;
 593         int rc = 0;
 594
 595         lock->refreshing = 1;
 596
 597         if_header = xmalloc(strlen(lock->token) + 25);
 598         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 599         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 600         dav_headers = curl_slist_append(dav_headers, if_header);
 601         dav_headers = curl_slist_append(dav_headers, timeout_header);
 602
 603         slot = get_active_slot();
 604         slot->results = &results;
 605         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 606         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 607         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 608         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 609         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 610
 611         if (start_active_slot(slot)) {
 612                 run_active_slot(slot);
 613                 if (results.curl_result != CURLE_OK) {
 614                         fprintf(stderr, "LOCK HTTP error %ld\n",
 615                                 results.http_code);
 616                 } else {
 617                         lock->start_time = time(NULL);
 618                         rc = 1;
 619                 }
 620         }
 621
 622         lock->refreshing = 0;
 623         curl_slist_free_all(dav_headers);
 624         free(if_header);
 625
 626         return rc;
 627 }
 628
 629 static void check_locks(void)
 630 {
 631         struct remote_lock *lock = remote->locks;
 632         time_t current_time = time(NULL);
 633         int time_remaining;
 634
 635         while (lock) {
 636                 time_remaining = lock->start_time + lock->timeout -
 637                         current_time;
 638                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 639                         if (!refresh_lock(lock)) {
 640                                 fprintf(stderr,
 641                                         "Unable to refresh lock for %s\n",
 642                                         lock->url);
 643                                 aborted = 1;
 644                                 return;
 645                         }
 646                 }
 647                 lock = lock->next;
 648         }
 649 }
 650
 651 static void release_request(struct transfer_request *request)
 652 {
 653         struct transfer_request *entry = request_queue_head;
 654
 655         if (request == request_queue_head) {
 656                 request_queue_head = request->next;
 657         } else {
 658                 while (entry->next != NULL && entry->next != request)
 659                         entry = entry->next;
 660                 if (entry->next == request)
 661                         entry->next = entry->next->next;
 662         }
 663
 664         if (request->local_fileno != -1)
 665                 close(request->local_fileno);
 666         if (request->local_stream)
 667                 fclose(request->local_stream);
 668         if (request->url != NULL)
 669                 free(request->url);
 670         free(request);
 671 }
 672
 673 static void finish_request(struct transfer_request *request)
 674 {
 675         struct stat st;
 676         struct packed_git *target;
 677         struct packed_git **lst;
 678
 679         request->curl_result = request->slot->curl_result;
 680         request->http_code = request->slot->http_code;
 681         request->slot = NULL;
 682
 683         /* Keep locks active */
 684         check_locks();
 685
 686         if (request->headers != NULL)
 687                 curl_slist_free_all(request->headers);
 688
 689         /* URL is reused for MOVE after PUT */
 690         if (request->state != RUN_PUT) {
 691                 free(request->url);
 692                 request->url = NULL;
 693         }
 694
 695         if (request->state == RUN_MKCOL) {
 696                 if (request->curl_result == CURLE_OK ||
 697                     request->http_code == 405) {
 698                         remote_dir_exists[request->obj->sha1[0]] = 1;
 699                         start_put(request);
 700                 } else {
 701                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 702                                 sha1_to_hex(request->obj->sha1),
 703                                 request->curl_result, request->http_code);
 704                         request->state = ABORTED;
 705                         aborted = 1;
 706                 }
 707         } else if (request->state == RUN_PUT) {
 708                 if (request->curl_result == CURLE_OK) {
 709                         start_move(request);
 710                 } else {
 711                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 712                                 sha1_to_hex(request->obj->sha1),
 713                                 request->curl_result, request->http_code);
 714                         request->state = ABORTED;
 715                         aborted = 1;
 716                 }
 717         } else if (request->state == RUN_MOVE) {
 718                 if (request->curl_result == CURLE_OK) {
 719                         if (push_verbosely)
 720                                 fprintf(stderr, "    sent %s\n",
 721                                         sha1_to_hex(request->obj->sha1));
 722                         request->obj->flags |= REMOTE;
 723                         release_request(request);
 724                 } else {
 725                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 726                                 sha1_to_hex(request->obj->sha1),
 727                                 request->curl_result, request->http_code);
 728                         request->state = ABORTED;
 729                         aborted = 1;
 730                 }
 731         } else if (request->state == RUN_FETCH_LOOSE) {
 732                 fchmod(request->local_fileno, 0444);
 733                 close(request->local_fileno); request->local_fileno = -1;
 734
 735                 if (request->curl_result != CURLE_OK &&
 736                     request->http_code != 416) {
 737                         if (stat(request->tmpfile, &st) == 0) {
 738                                 if (st.st_size == 0)
 739                                         unlink(request->tmpfile);
 740                         }
 741                 } else {
 742                         if (request->http_code == 416)
 743                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 744
 745                         inflateEnd(&request->stream);
 746                         SHA1_Final(request->real_sha1, &request->c);
 747                         if (request->zret != Z_STREAM_END) {
 748                                 unlink(request->tmpfile);
 749                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 750                                 unlink(request->tmpfile);
 751                         } else {
 752                                 request->rename =
 753                                         move_temp_to_file(
 754                                                 request->tmpfile,
 755                                                 request->filename);
 756                                 if (request->rename == 0) {
 757                                         request->obj->flags |= (LOCAL | REMOTE);
 758                                 }
 759                         }
 760                 }
 761
 762                 /* Try fetching packed if necessary */
 763                 if (request->obj->flags & LOCAL)
 764                         release_request(request);
 765                 else
 766                         start_fetch_packed(request);
 767
 768         } else if (request->state == RUN_FETCH_PACKED) {
 769                 if (request->curl_result != CURLE_OK) {
 770                         fprintf(stderr, "Unable to get pack file %s\n%s",
 771                                 request->url, curl_errorstr);
 772                         remote->can_update_info_refs = 0;
 773                 } else {
 774                         off_t pack_size = ftell(request->local_stream);
 775
 776                         fclose(request->local_stream);
 777                         request->local_stream = NULL;
 778                         if (!move_temp_to_file(request->tmpfile,
 779                                                request->filename)) {
 780                                 target = (struct packed_git *)request->userData;
 781                                 target->pack_size = pack_size;
 782                                 lst = &remote->packs;
 783                                 while (*lst != target)
 784                                         lst = &((*lst)->next);
 785                                 *lst = (*lst)->next;
 786
 787                                 if (!verify_pack(target, 0))
 788                                         install_packed_git(target);
 789                                 else
 790                                         remote->can_update_info_refs = 0;
 791                         }
 792                 }
 793                 release_request(request);
 794         }
 795 }
 796
 797 #ifdef USE_CURL_MULTI
 798 static int fill_active_slot(void *unused)
 799 {
 800         struct transfer_request *request = request_queue_head;
 801
 802         if (aborted)
 803                 return 0;
 804
 805         for (request = request_queue_head; request; request = request->next) {
 806                 if (request->state == NEED_FETCH) {
 807                         start_fetch_loose(request);
 808                         return 1;
 809                 } else if (pushing && request->state == NEED_PUSH) {
 810                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 811                                 start_put(request);
 812                         } else {
 813                                 start_mkcol(request);
 814                         }
 815                         return 1;
 816                 }
 817         }
 818         return 0;
 819 }
 820 #endif
 821
 822 static void get_remote_object_list(unsigned char parent);
 823
 824 static void add_fetch_request(struct object *obj)
 825 {
 826         struct transfer_request *request;
 827
 828         check_locks();
 829
 830         /*
 831          * Don't fetch the object if it's known to exist locally
 832          * or is already in the request queue
 833          */
 834         if (remote_dir_exists[obj->sha1[0]] == -1)
 835                 get_remote_object_list(obj->sha1[0]);
 836         if (obj->flags & (LOCAL | FETCHING))
 837                 return;
 838
 839         obj->flags |= FETCHING;
 840         request = xmalloc(sizeof(*request));
 841         request->obj = obj;
 842         request->url = NULL;
 843         request->lock = NULL;
 844         request->headers = NULL;
 845         request->local_fileno = -1;
 846         request->local_stream = NULL;
 847         request->state = NEED_FETCH;
 848         request->next = request_queue_head;
 849         request_queue_head = request;
 850
 851 #ifdef USE_CURL_MULTI
 852         fill_active_slots();
 853         step_active_slots();
 854 #endif
 855 }
 856
 857 static int add_send_request(struct object *obj, struct remote_lock *lock)
 858 {
 859         struct transfer_request *request = request_queue_head;
 860         struct packed_git *target;
 861
 862         /* Keep locks active */
 863         check_locks();
 864
 865         /*
 866          * Don't push the object if it's known to exist on the remote
 867          * or is already in the request queue
 868          */
 869         if (remote_dir_exists[obj->sha1[0]] == -1)
 870                 get_remote_object_list(obj->sha1[0]);
 871         if (obj->flags & (REMOTE | PUSHING))
 872                 return 0;
 873         target = find_sha1_pack(obj->sha1, remote->packs);
 874         if (target) {
 875                 obj->flags |= REMOTE;
 876                 return 0;
 877         }
 878
 879         obj->flags |= PUSHING;
 880         request = xmalloc(sizeof(*request));
 881         request->obj = obj;
 882         request->url = NULL;
 883         request->lock = lock;
 884         request->headers = NULL;
 885         request->local_fileno = -1;
 886         request->local_stream = NULL;
 887         request->state = NEED_PUSH;
 888         request->next = request_queue_head;
 889         request_queue_head = request;
 890
 891 #ifdef USE_CURL_MULTI
 892         fill_active_slots();
 893         step_active_slots();
 894 #endif
 895
 896         return 1;
 897 }
 898
 899 static int fetch_index(unsigned char *sha1)
 900 {
 901         char *hex = sha1_to_hex(sha1);
 902         char *filename;
 903         char *url;
 904         char tmpfile[PATH_MAX];
 905         long prev_posn = 0;
 906         char range[RANGE_HEADER_SIZE];
 907         struct curl_slist *range_header = NULL;
 908
 909         FILE *indexfile;
 910         struct active_request_slot *slot;
 911         struct slot_results results;
 912
 913         /* Don't use the index if the pack isn't there */
 914         url = xmalloc(strlen(remote->url) + 64);
 915         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 916         slot = get_active_slot();
 917         slot->results = &results;
 918         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 919         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 920         if (start_active_slot(slot)) {
 921                 run_active_slot(slot);
 922                 if (results.curl_result != CURLE_OK) {
 923                         free(url);
 924                         return error("Unable to verify pack %s is available",
 925                                      hex);
 926                 }
 927         } else {
 928                 return error("Unable to start request");
 929         }
 930
 931         if (has_pack_index(sha1))
 932                 return 0;
 933
 934         if (push_verbosely)
 935                 fprintf(stderr, "Getting index for pack %s\n", hex);
 936
 937         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 938
 939         filename = sha1_pack_index_name(sha1);
 940         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 941         indexfile = fopen(tmpfile, "a");
 942         if (!indexfile)
 943                 return error("Unable to open local file %s for pack index",
 944                              filename);
 945
 946         slot = get_active_slot();
 947         slot->results = &results;
 948         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 949         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 950         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 951         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 952         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 953         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 954         slot->local = indexfile;
 955
 956         /* If there is data present from a previous transfer attempt,
 957            resume where it left off */
 958         prev_posn = ftell(indexfile);
 959         if (prev_posn>0) {
 960                 if (push_verbosely)
 961                         fprintf(stderr,
 962                                 "Resuming fetch of index for pack %s at byte %ld\n",
 963                                 hex, prev_posn);
 964                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 965                 range_header = curl_slist_append(range_header, range);
 966                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 967         }
 968
 969         if (start_active_slot(slot)) {
 970                 run_active_slot(slot);
 971                 if (results.curl_result != CURLE_OK) {
 972                         free(url);
 973                         fclose(indexfile);
 974                         return error("Unable to get pack index %s\n%s", url,
 975                                      curl_errorstr);
 976                 }
 977         } else {
 978                 free(url);
 979                 fclose(indexfile);
 980                 return error("Unable to start request");
 981         }
 982
 983         free(url);
 984         fclose(indexfile);
 985
 986         return move_temp_to_file(tmpfile, filename);
 987 }
 988
 989 static int setup_index(unsigned char *sha1)
 990 {
 991         struct packed_git *new_pack;
 992
 993         if (fetch_index(sha1))
 994                 return -1;
 995
 996         new_pack = parse_pack_index(sha1);
 997         new_pack->next = remote->packs;
 998         remote->packs = new_pack;
 999         return 0;
1000 }
1001
1002 static int fetch_indices(void)
1003 {
1004         unsigned char sha1[20];
1005         char *url;
1006         struct buffer buffer;
1007         char *data;
1008         int i = 0;
1009
1010         struct active_request_slot *slot;
1011         struct slot_results results;
1012
1013         data = xcalloc(1, 4096);
1014         buffer.size = 4096;
1015         buffer.posn = 0;
1016         buffer.buffer = data;
1017
1018         if (push_verbosely)
1019                 fprintf(stderr, "Getting pack list\n");
1020
1021         url = xmalloc(strlen(remote->url) + 20);
1022         sprintf(url, "%sobjects/info/packs", remote->url);
1023
1024         slot = get_active_slot();
1025         slot->results = &results;
1026         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1028         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1029         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1030         if (start_active_slot(slot)) {
1031                 run_active_slot(slot);
1032                 if (results.curl_result != CURLE_OK) {
1033                         free(buffer.buffer);
1034                         free(url);
1035                         if (results.http_code == 404)
1036                                 return 0;
1037                         else
1038                                 return error("%s", curl_errorstr);
1039                 }
1040         } else {
1041                 free(buffer.buffer);
1042                 free(url);
1043                 return error("Unable to start request");
1044         }
1045         free(url);
1046
1047         data = buffer.buffer;
1048         while (i < buffer.posn) {
1049                 switch (data[i]) {
1050                 case 'P':
1051                         i++;
1052                         if (i + 52 < buffer.posn &&
1053                             !prefixcmp(data + i, " pack-") &&
1054                             !prefixcmp(data + i + 46, ".pack\n")) {
1055                                 get_sha1_hex(data + i + 6, sha1);
1056                                 setup_index(sha1);
1057                                 i += 51;
1058                                 break;
1059                         }
1060                 default:
1061                         while (data[i] != '\n')
1062                                 i++;
1063                 }
1064                 i++;
1065         }
1066
1067         free(buffer.buffer);
1068         return 0;
1069 }
1070
1071 static inline int needs_quote(int ch)
1072 {
1073         if (((ch >= 'A') && (ch <= 'Z'))
1074                         || ((ch >= 'a') && (ch <= 'z'))
1075                         || ((ch >= '0') && (ch <= '9'))
1076                         || (ch == '/')
1077                         || (ch == '-')
1078                         || (ch == '.'))
1079                 return 0;
1080         return 1;
1081 }
1082
1083 static inline int hex(int v)
1084 {
1085         if (v < 10) return '0' + v;
1086         else return 'A' + v - 10;
1087 }
1088
1089 static char *quote_ref_url(const char *base, const char *ref)
1090 {
1091         const char *cp;
1092         char *dp, *qref;
1093         int len, baselen, ch;
1094
1095         baselen = strlen(base);
1096         len = baselen + 1;
1097         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1098                 if (needs_quote(ch))
1099                         len += 2; /* extra two hex plus replacement % */
1100         qref = xmalloc(len);
1101         memcpy(qref, base, baselen);
1102         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1103                 if (needs_quote(ch)) {
1104                         *dp++ = '%';
1105                         *dp++ = hex((ch >> 4) & 0xF);
1106                         *dp++ = hex(ch & 0xF);
1107                 }
1108                 else
1109                         *dp++ = ch;
1110         }
1111         *dp = 0;
1112
1113         return qref;
1114 }
1115
1116 int fetch_ref(char *ref, unsigned char *sha1)
1117 {
1118         char *url;
1119         char hex[42];
1120         struct buffer buffer;
1121         char *base = remote->url;
1122         struct active_request_slot *slot;
1123         struct slot_results results;
1124         buffer.size = 41;
1125         buffer.posn = 0;
1126         buffer.buffer = hex;
1127         hex[41] = '\0';
1128
1129         url = quote_ref_url(base, ref);
1130         slot = get_active_slot();
1131         slot->results = &results;
1132         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1133         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1134         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1135         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1136         if (start_active_slot(slot)) {
1137                 run_active_slot(slot);
1138                 if (results.curl_result != CURLE_OK)
1139                         return error("Couldn't get %s for %s\n%s",
1140                                      url, ref, curl_errorstr);
1141         } else {
1142                 return error("Unable to start request");
1143         }
1144
1145         hex[40] = '\0';
1146         get_sha1_hex(hex, sha1);
1147         return 0;
1148 }
1149
1150 static void one_remote_object(const char *hex)
1151 {
1152         unsigned char sha1[20];
1153         struct object *obj;
1154
1155         if (get_sha1_hex(hex, sha1) != 0)
1156                 return;
1157
1158         obj = lookup_object(sha1);
1159         if (!obj)
1160                 obj = parse_object(sha1);
1161
1162         /* Ignore remote objects that don't exist locally */
1163         if (!obj)
1164                 return;
1165
1166         obj->flags |= REMOTE;
1167         if (!object_list_contains(objects, obj))
1168                 object_list_insert(obj, &objects);
1169 }
1170
1171 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1172 {
1173         int *lock_flags = (int *)ctx->userData;
1174
1175         if (tag_closed) {
1176                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1177                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1178                             (*lock_flags & DAV_PROP_LOCKWR)) {
1179                                 *lock_flags |= DAV_LOCK_OK;
1180                         }
1181                         *lock_flags &= DAV_LOCK_OK;
1182                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1183                         *lock_flags |= DAV_PROP_LOCKWR;
1184                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1185                         *lock_flags |= DAV_PROP_LOCKEX;
1186                 }
1187         }
1188 }
1189
1190 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1191 {
1192         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1193
1194         if (tag_closed && ctx->cdata) {
1195                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1196                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1197                         strcpy(lock->owner, ctx->cdata);
1198                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1199                         if (!prefixcmp(ctx->cdata, "Second-"))
1200                                 lock->timeout =
1201                                         strtol(ctx->cdata + 7, NULL, 10);
1202                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1203                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1204                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1205                                 strcpy(lock->token, ctx->cdata + 16);
1206                         }
1207                 }
1208         }
1209 }
1210
1211 static void one_remote_ref(char *refname);
1212
1213 static void
1214 xml_start_tag(void *userData, const char *name, const char **atts)
1215 {
1216         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1217         const char *c = strchr(name, ':');
1218         int new_len;
1219
1220         if (c == NULL)
1221                 c = name;
1222         else
1223                 c++;
1224
1225         new_len = strlen(ctx->name) + strlen(c) + 2;
1226
1227         if (new_len > ctx->len) {
1228                 ctx->name = xrealloc(ctx->name, new_len);
1229                 ctx->len = new_len;
1230         }
1231         strcat(ctx->name, ".");
1232         strcat(ctx->name, c);
1233
1234         free(ctx->cdata);
1235         ctx->cdata = NULL;
1236
1237         ctx->userFunc(ctx, 0);
1238 }
1239
1240 static void
1241 xml_end_tag(void *userData, const char *name)
1242 {
1243         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1244         const char *c = strchr(name, ':');
1245         char *ep;
1246
1247         ctx->userFunc(ctx, 1);
1248
1249         if (c == NULL)
1250                 c = name;
1251         else
1252                 c++;
1253
1254         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1255         *ep = 0;
1256 }
1257
1258 static void
1259 xml_cdata(void *userData, const XML_Char *s, int len)
1260 {
1261         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1262         free(ctx->cdata);
1263         ctx->cdata = xmemdupz(s, len);
1264 }
1265
1266 static struct remote_lock *lock_remote(const char *path, long timeout)
1267 {
1268         struct active_request_slot *slot;
1269         struct slot_results results;
1270         struct buffer out_buffer;
1271         struct buffer in_buffer;
1272         char *out_data;
1273         char *in_data;
1274         char *url;
1275         char *ep;
1276         char timeout_header[25];
1277         struct remote_lock *lock = NULL;
1278         XML_Parser parser = XML_ParserCreate(NULL);
1279         enum XML_Status result;
1280         struct curl_slist *dav_headers = NULL;
1281         struct xml_ctx ctx;
1282
1283         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1284         sprintf(url, "%s%s", remote->url, path);
1285
1286         /* Make sure leading directories exist for the remote ref */
1287         ep = strchr(url + strlen(remote->url) + 1, '/');
1288         while (ep) {
1289                 *ep = 0;
1290                 slot = get_active_slot();
1291                 slot->results = &results;
1292                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1293                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1294                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1295                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1296                 if (start_active_slot(slot)) {
1297                         run_active_slot(slot);
1298                         if (results.curl_result != CURLE_OK &&
1299                             results.http_code != 405) {
1300                                 fprintf(stderr,
1301                                         "Unable to create branch path %s\n",
1302                                         url);
1303                                 free(url);
1304                                 return NULL;
1305                         }
1306                 } else {
1307                         fprintf(stderr, "Unable to start MKCOL request\n");
1308                         free(url);
1309                         return NULL;
1310                 }
1311                 *ep = '/';
1312                 ep = strchr(ep + 1, '/');
1313         }
1314
1315         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1316         out_data = xmalloc(out_buffer.size + 1);
1317         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1318         out_buffer.posn = 0;
1319         out_buffer.buffer = out_data;
1320
1321         in_buffer.size = 4096;
1322         in_data = xmalloc(in_buffer.size);
1323         in_buffer.posn = 0;
1324         in_buffer.buffer = in_data;
1325
1326         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1327         dav_headers = curl_slist_append(dav_headers, timeout_header);
1328         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1329
1330         slot = get_active_slot();
1331         slot->results = &results;
1332         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1333         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1334         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1335         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1336         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1337         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1338         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1339         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1340         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1341
1342         lock = xcalloc(1, sizeof(*lock));
1343         lock->timeout = -1;
1344
1345         if (start_active_slot(slot)) {
1346                 run_active_slot(slot);
1347                 if (results.curl_result == CURLE_OK) {
1348                         ctx.name = xcalloc(10, 1);
1349                         ctx.len = 0;
1350                         ctx.cdata = NULL;
1351                         ctx.userFunc = handle_new_lock_ctx;
1352                         ctx.userData = lock;
1353                         XML_SetUserData(parser, &ctx);
1354                         XML_SetElementHandler(parser, xml_start_tag,
1355                                               xml_end_tag);
1356                         XML_SetCharacterDataHandler(parser, xml_cdata);
1357                         result = XML_Parse(parser, in_buffer.buffer,
1358                                            in_buffer.posn, 1);
1359                         free(ctx.name);
1360                         if (result != XML_STATUS_OK) {
1361                                 fprintf(stderr, "XML error: %s\n",
1362                                         XML_ErrorString(
1363                                                 XML_GetErrorCode(parser)));
1364                                 lock->timeout = -1;
1365                         }
1366                 }
1367         } else {
1368                 fprintf(stderr, "Unable to start LOCK request\n");
1369         }
1370
1371         curl_slist_free_all(dav_headers);
1372         free(out_data);
1373         free(in_data);
1374
1375         if (lock->token == NULL || lock->timeout <= 0) {
1376                 if (lock->token != NULL)
1377                         free(lock->token);
1378                 if (lock->owner != NULL)
1379                         free(lock->owner);
1380                 free(url);
1381                 free(lock);
1382                 lock = NULL;
1383         } else {
1384                 lock->url = url;
1385                 lock->start_time = time(NULL);
1386                 lock->next = remote->locks;
1387                 remote->locks = lock;
1388         }
1389
1390         return lock;
1391 }
1392
1393 static int unlock_remote(struct remote_lock *lock)
1394 {
1395         struct active_request_slot *slot;
1396         struct slot_results results;
1397         struct remote_lock *prev = remote->locks;
1398         char *lock_token_header;
1399         struct curl_slist *dav_headers = NULL;
1400         int rc = 0;
1401
1402         lock_token_header = xmalloc(strlen(lock->token) + 31);
1403         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1404                 lock->token);
1405         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1406
1407         slot = get_active_slot();
1408         slot->results = &results;
1409         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1410         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1411         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1412         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1413
1414         if (start_active_slot(slot)) {
1415                 run_active_slot(slot);
1416                 if (results.curl_result == CURLE_OK)
1417                         rc = 1;
1418                 else
1419                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1420                                 results.http_code);
1421         } else {
1422                 fprintf(stderr, "Unable to start UNLOCK request\n");
1423         }
1424
1425         curl_slist_free_all(dav_headers);
1426         free(lock_token_header);
1427
1428         if (remote->locks == lock) {
1429                 remote->locks = lock->next;
1430         } else {
1431                 while (prev && prev->next != lock)
1432                         prev = prev->next;
1433                 if (prev)
1434                         prev->next = prev->next->next;
1435         }
1436
1437         if (lock->owner != NULL)
1438                 free(lock->owner);
1439         free(lock->url);
1440         free(lock->token);
1441         free(lock);
1442
1443         return rc;
1444 }
1445
1446 static void remote_ls(const char *path, int flags,
1447                       void (*userFunc)(struct remote_ls_ctx *ls),
1448                       void *userData);
1449
1450 static void process_ls_object(struct remote_ls_ctx *ls)
1451 {
1452         unsigned int *parent = (unsigned int *)ls->userData;
1453         char *path = ls->dentry_name;
1454         char *obj_hex;
1455
1456         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1457                 remote_dir_exists[*parent] = 1;
1458                 return;
1459         }
1460
1461         if (strlen(path) != 49)
1462                 return;
1463         path += 8;
1464         obj_hex = xmalloc(strlen(path));
1465         /* NB: path is not null-terminated, can not use strlcpy here */
1466         memcpy(obj_hex, path, 2);
1467         strcpy(obj_hex + 2, path + 3);
1468         one_remote_object(obj_hex);
1469         free(obj_hex);
1470 }
1471
1472 static void process_ls_ref(struct remote_ls_ctx *ls)
1473 {
1474         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1475                 fprintf(stderr, "  %s\n", ls->dentry_name);
1476                 return;
1477         }
1478
1479         if (!(ls->dentry_flags & IS_DIR))
1480                 one_remote_ref(ls->dentry_name);
1481 }
1482
1483 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1484 {
1485         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1486
1487         if (tag_closed) {
1488                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1489                         if (ls->dentry_flags & IS_DIR) {
1490                                 if (ls->flags & PROCESS_DIRS) {
1491                                         ls->userFunc(ls);
1492                                 }
1493                                 if (strcmp(ls->dentry_name, ls->path) &&
1494                                     ls->flags & RECURSIVE) {
1495                                         remote_ls(ls->dentry_name,
1496                                                   ls->flags,
1497                                                   ls->userFunc,
1498                                                   ls->userData);
1499                                 }
1500                         } else if (ls->flags & PROCESS_FILES) {
1501                                 ls->userFunc(ls);
1502                         }
1503                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1504                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1505                                                   remote->path_len + 1);
1506                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1507                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1508                         ls->dentry_flags |= IS_DIR;
1509                 }
1510         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1511                 free(ls->dentry_name);
1512                 ls->dentry_name = NULL;
1513                 ls->dentry_flags = 0;
1514         }
1515 }
1516
1517 static void remote_ls(const char *path, int flags,
1518                       void (*userFunc)(struct remote_ls_ctx *ls),
1519                       void *userData)
1520 {
1521         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1522         struct active_request_slot *slot;
1523         struct slot_results results;
1524         struct buffer in_buffer;
1525         struct buffer out_buffer;
1526         char *in_data;
1527         char *out_data;
1528         XML_Parser parser = XML_ParserCreate(NULL);
1529         enum XML_Status result;
1530         struct curl_slist *dav_headers = NULL;
1531         struct xml_ctx ctx;
1532         struct remote_ls_ctx ls;
1533
1534         ls.flags = flags;
1535         ls.path = xstrdup(path);
1536         ls.dentry_name = NULL;
1537         ls.dentry_flags = 0;
1538         ls.userData = userData;
1539         ls.userFunc = userFunc;
1540
1541         sprintf(url, "%s%s", remote->url, path);
1542
1543         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1544         out_data = xmalloc(out_buffer.size + 1);
1545         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1546         out_buffer.posn = 0;
1547         out_buffer.buffer = out_data;
1548
1549         in_buffer.size = 4096;
1550         in_data = xmalloc(in_buffer.size);
1551         in_buffer.posn = 0;
1552         in_buffer.buffer = in_data;
1553
1554         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1555         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1556
1557         slot = get_active_slot();
1558         slot->results = &results;
1559         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1560         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1561         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1562         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1563         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1564         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1565         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1566         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1567         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1568
1569         if (start_active_slot(slot)) {
1570                 run_active_slot(slot);
1571                 if (results.curl_result == CURLE_OK) {
1572                         ctx.name = xcalloc(10, 1);
1573                         ctx.len = 0;
1574                         ctx.cdata = NULL;
1575                         ctx.userFunc = handle_remote_ls_ctx;
1576                         ctx.userData = &ls;
1577                         XML_SetUserData(parser, &ctx);
1578                         XML_SetElementHandler(parser, xml_start_tag,
1579                                               xml_end_tag);
1580                         XML_SetCharacterDataHandler(parser, xml_cdata);
1581                         result = XML_Parse(parser, in_buffer.buffer,
1582                                            in_buffer.posn, 1);
1583                         free(ctx.name);
1584
1585                         if (result != XML_STATUS_OK) {
1586                                 fprintf(stderr, "XML error: %s\n",
1587                                         XML_ErrorString(
1588                                                 XML_GetErrorCode(parser)));
1589                         }
1590                 }
1591         } else {
1592                 fprintf(stderr, "Unable to start PROPFIND request\n");
1593         }
1594
1595         free(ls.path);
1596         free(url);
1597         free(out_data);
1598         free(in_buffer.buffer);
1599         curl_slist_free_all(dav_headers);
1600 }
1601
1602 static void get_remote_object_list(unsigned char parent)
1603 {
1604         char path[] = "objects/XX/";
1605         static const char hex[] = "0123456789abcdef";
1606         unsigned int val = parent;
1607
1608         path[8] = hex[val >> 4];
1609         path[9] = hex[val & 0xf];
1610         remote_dir_exists[val] = 0;
1611         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1612                   process_ls_object, &val);
1613 }
1614
1615 static int locking_available(void)
1616 {
1617         struct active_request_slot *slot;
1618         struct slot_results results;
1619         struct buffer in_buffer;
1620         struct buffer out_buffer;
1621         char *in_data;
1622         char *out_data;
1623         XML_Parser parser = XML_ParserCreate(NULL);
1624         enum XML_Status result;
1625         struct curl_slist *dav_headers = NULL;
1626         struct xml_ctx ctx;
1627         int lock_flags = 0;
1628
1629         out_buffer.size =
1630                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1631                 strlen(remote->url) - 2;
1632         out_data = xmalloc(out_buffer.size + 1);
1633         snprintf(out_data, out_buffer.size + 1,
1634                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1635         out_buffer.posn = 0;
1636         out_buffer.buffer = out_data;
1637
1638         in_buffer.size = 4096;
1639         in_data = xmalloc(in_buffer.size);
1640         in_buffer.posn = 0;
1641         in_buffer.buffer = in_data;
1642
1643         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1644         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1645
1646         slot = get_active_slot();
1647         slot->results = &results;
1648         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1649         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1650         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1651         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1653         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1654         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1655         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1656         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1657
1658         if (start_active_slot(slot)) {
1659                 run_active_slot(slot);
1660                 if (results.curl_result == CURLE_OK) {
1661                         ctx.name = xcalloc(10, 1);
1662                         ctx.len = 0;
1663                         ctx.cdata = NULL;
1664                         ctx.userFunc = handle_lockprop_ctx;
1665                         ctx.userData = &lock_flags;
1666                         XML_SetUserData(parser, &ctx);
1667                         XML_SetElementHandler(parser, xml_start_tag,
1668                                               xml_end_tag);
1669                         result = XML_Parse(parser, in_buffer.buffer,
1670                                            in_buffer.posn, 1);
1671                         free(ctx.name);
1672
1673                         if (result != XML_STATUS_OK) {
1674                                 fprintf(stderr, "XML error: %s\n",
1675                                         XML_ErrorString(
1676                                                 XML_GetErrorCode(parser)));
1677                                 lock_flags = 0;
1678                         }
1679                 }
1680         } else {
1681                 fprintf(stderr, "Unable to start PROPFIND request\n");
1682         }
1683
1684         free(out_data);
1685         free(in_buffer.buffer);
1686         curl_slist_free_all(dav_headers);
1687
1688         return lock_flags;
1689 }
1690
1691 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1692 {
1693         struct object_list *entry = xmalloc(sizeof(struct object_list));
1694         entry->item = obj;
1695         entry->next = *p;
1696         *p = entry;
1697         return &entry->next;
1698 }
1699
1700 static struct object_list **process_blob(struct blob *blob,
1701                                          struct object_list **p,
1702                                          struct name_path *path,
1703                                          const char *name)
1704 {
1705         struct object *obj = &blob->object;
1706
1707         obj->flags |= LOCAL;
1708
1709         if (obj->flags & (UNINTERESTING | SEEN))
1710                 return p;
1711
1712         obj->flags |= SEEN;
1713         return add_one_object(obj, p);
1714 }
1715
1716 static struct object_list **process_tree(struct tree *tree,
1717                                          struct object_list **p,
1718                                          struct name_path *path,
1719                                          const char *name)
1720 {
1721         struct object *obj = &tree->object;
1722         struct tree_desc desc;
1723         struct name_entry entry;
1724         struct name_path me;
1725
1726         obj->flags |= LOCAL;
1727
1728         if (obj->flags & (UNINTERESTING | SEEN))
1729                 return p;
1730         if (parse_tree(tree) < 0)
1731                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1732
1733         obj->flags |= SEEN;
1734         name = xstrdup(name);
1735         p = add_one_object(obj, p);
1736         me.up = path;
1737         me.elem = name;
1738         me.elem_len = strlen(name);
1739
1740         init_tree_desc(&desc, tree->buffer, tree->size);
1741
1742         while (tree_entry(&desc, &entry)) {
1743                 if (S_ISDIR(entry.mode))
1744                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1745                 else
1746                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1747         }
1748         free(tree->buffer);
1749         tree->buffer = NULL;
1750         return p;
1751 }
1752
1753 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1754 {
1755         int i;
1756         struct commit *commit;
1757         struct object_list **p = &objects;
1758         int count = 0;
1759
1760         while ((commit = get_revision(revs)) != NULL) {
1761                 p = process_tree(commit->tree, p, NULL, "");
1762                 commit->object.flags |= LOCAL;
1763                 if (!(commit->object.flags & UNINTERESTING))
1764                         count += add_send_request(&commit->object, lock);
1765         }
1766
1767         for (i = 0; i < revs->pending.nr; i++) {
1768                 struct object_array_entry *entry = revs->pending.objects + i;
1769                 struct object *obj = entry->item;
1770                 const char *name = entry->name;
1771
1772                 if (obj->flags & (UNINTERESTING | SEEN))
1773                         continue;
1774                 if (obj->type == OBJ_TAG) {
1775                         obj->flags |= SEEN;
1776                         p = add_one_object(obj, p);
1777                         continue;
1778                 }
1779                 if (obj->type == OBJ_TREE) {
1780                         p = process_tree((struct tree *)obj, p, NULL, name);
1781                         continue;
1782                 }
1783                 if (obj->type == OBJ_BLOB) {
1784                         p = process_blob((struct blob *)obj, p, NULL, name);
1785                         continue;
1786                 }
1787                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1788         }
1789
1790         while (objects) {
1791                 if (!(objects->item->flags & UNINTERESTING))
1792                         count += add_send_request(objects->item, lock);
1793                 objects = objects->next;
1794         }
1795
1796         return count;
1797 }
1798
1799 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1800 {
1801         struct active_request_slot *slot;
1802         struct slot_results results;
1803         char *out_data;
1804         char *if_header;
1805         struct buffer out_buffer;
1806         struct curl_slist *dav_headers = NULL;
1807         int i;
1808
1809         if_header = xmalloc(strlen(lock->token) + 25);
1810         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1811         dav_headers = curl_slist_append(dav_headers, if_header);
1812
1813         out_buffer.size = 41;
1814         out_data = xmalloc(out_buffer.size + 1);
1815         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1816         if (i != out_buffer.size) {
1817                 fprintf(stderr, "Unable to initialize PUT request body\n");
1818                 return 0;
1819         }
1820         out_buffer.posn = 0;
1821         out_buffer.buffer = out_data;
1822
1823         slot = get_active_slot();
1824         slot->results = &results;
1825         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1826         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1827         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1828         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1829         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1830         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1831         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1832         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1833         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1834
1835         if (start_active_slot(slot)) {
1836                 run_active_slot(slot);
1837                 free(out_data);
1838                 free(if_header);
1839                 if (results.curl_result != CURLE_OK) {
1840                         fprintf(stderr,
1841                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1842                                 results.curl_result, results.http_code);
1843                         /* We should attempt recovery? */
1844                         return 0;
1845                 }
1846         } else {
1847                 free(out_data);
1848                 free(if_header);
1849                 fprintf(stderr, "Unable to start PUT request\n");
1850                 return 0;
1851         }
1852
1853         return 1;
1854 }
1855
1856 static struct ref *local_refs, **local_tail;
1857 static struct ref *remote_refs, **remote_tail;
1858
1859 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1860 {
1861         struct ref *ref;
1862         int len = strlen(refname) + 1;
1863         ref = xcalloc(1, sizeof(*ref) + len);
1864         hashcpy(ref->new_sha1, sha1);
1865         memcpy(ref->name, refname, len);
1866         *local_tail = ref;
1867         local_tail = &ref->next;
1868         return 0;
1869 }
1870
1871 static void one_remote_ref(char *refname)
1872 {
1873         struct ref *ref;
1874         unsigned char remote_sha1[20];
1875         struct object *obj;
1876         int len = strlen(refname) + 1;
1877
1878         if (fetch_ref(refname, remote_sha1) != 0) {
1879                 fprintf(stderr,
1880                         "Unable to fetch ref %s from %s\n",
1881                         refname, remote->url);
1882                 return;
1883         }
1884
1885         /*
1886          * Fetch a copy of the object if it doesn't exist locally - it
1887          * may be required for updating server info later.
1888          */
1889         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1890                 obj = lookup_unknown_object(remote_sha1);
1891                 if (obj) {
1892                         fprintf(stderr, "  fetch %s for %s\n",
1893                                 sha1_to_hex(remote_sha1), refname);
1894                         add_fetch_request(obj);
1895                 }
1896         }
1897
1898         ref = xcalloc(1, sizeof(*ref) + len);
1899         hashcpy(ref->old_sha1, remote_sha1);
1900         memcpy(ref->name, refname, len);
1901         *remote_tail = ref;
1902         remote_tail = &ref->next;
1903 }
1904
1905 static void get_local_heads(void)
1906 {
1907         local_tail = &local_refs;
1908         for_each_ref(one_local_ref, NULL);
1909 }
1910
1911 static void get_dav_remote_heads(void)
1912 {
1913         remote_tail = &remote_refs;
1914         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1915 }
1916
1917 static int is_zero_sha1(const unsigned char *sha1)
1918 {
1919         int i;
1920
1921         for (i = 0; i < 20; i++) {
1922                 if (*sha1++)
1923                         return 0;
1924         }
1925         return 1;
1926 }
1927
1928 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1929 {
1930         while (list) {
1931                 struct commit_list *temp = list;
1932                 temp->item->object.flags &= ~mark;
1933                 list = temp->next;
1934                 free(temp);
1935         }
1936 }
1937
1938 static int ref_newer(const unsigned char *new_sha1,
1939                      const unsigned char *old_sha1)
1940 {
1941         struct object *o;
1942         struct commit *old, *new;
1943         struct commit_list *list, *used;
1944         int found = 0;
1945
1946         /* Both new and old must be commit-ish and new is descendant of
1947          * old.  Otherwise we require --force.
1948          */
1949         o = deref_tag(parse_object(old_sha1), NULL, 0);
1950         if (!o || o->type != OBJ_COMMIT)
1951                 return 0;
1952         old = (struct commit *) o;
1953
1954         o = deref_tag(parse_object(new_sha1), NULL, 0);
1955         if (!o || o->type != OBJ_COMMIT)
1956                 return 0;
1957         new = (struct commit *) o;
1958
1959         if (parse_commit(new) < 0)
1960                 return 0;
1961
1962         used = list = NULL;
1963         commit_list_insert(new, &list);
1964         while (list) {
1965                 new = pop_most_recent_commit(&list, TMP_MARK);
1966                 commit_list_insert(new, &used);
1967                 if (new == old) {
1968                         found = 1;
1969                         break;
1970                 }
1971         }
1972         unmark_and_free(list, TMP_MARK);
1973         unmark_and_free(used, TMP_MARK);
1974         return found;
1975 }
1976
1977 static void mark_edge_parents_uninteresting(struct commit *commit)
1978 {
1979         struct commit_list *parents;
1980
1981         for (parents = commit->parents; parents; parents = parents->next) {
1982                 struct commit *parent = parents->item;
1983                 if (!(parent->object.flags & UNINTERESTING))
1984                         continue;
1985                 mark_tree_uninteresting(parent->tree);
1986         }
1987 }
1988
1989 static void mark_edges_uninteresting(struct commit_list *list)
1990 {
1991         for ( ; list; list = list->next) {
1992                 struct commit *commit = list->item;
1993
1994                 if (commit->object.flags & UNINTERESTING) {
1995                         mark_tree_uninteresting(commit->tree);
1996                         continue;
1997                 }
1998                 mark_edge_parents_uninteresting(commit);
1999         }
2000 }
2001
2002 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2003 {
2004         struct buffer *buf = (struct buffer *)ls->userData;
2005         unsigned char remote_sha1[20];
2006         struct object *o;
2007         int len;
2008         char *ref_info;
2009
2010         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2011                 fprintf(stderr,
2012                         "Unable to fetch ref %s from %s\n",
2013                         ls->dentry_name, remote->url);
2014                 aborted = 1;
2015                 return;
2016         }
2017
2018         o = parse_object(remote_sha1);
2019         if (!o) {
2020                 fprintf(stderr,
2021                         "Unable to parse object %s for remote ref %s\n",
2022                         sha1_to_hex(remote_sha1), ls->dentry_name);
2023                 aborted = 1;
2024                 return;
2025         }
2026
2027         len = strlen(ls->dentry_name) + 42;
2028         ref_info = xcalloc(len + 1, 1);
2029         sprintf(ref_info, "%s   %s\n",
2030                 sha1_to_hex(remote_sha1), ls->dentry_name);
2031         fwrite_buffer(ref_info, 1, len, buf);
2032         free(ref_info);
2033
2034         if (o->type == OBJ_TAG) {
2035                 o = deref_tag(o, ls->dentry_name, 0);
2036                 if (o) {
2037                         len = strlen(ls->dentry_name) + 45;
2038                         ref_info = xcalloc(len + 1, 1);
2039                         sprintf(ref_info, "%s   %s^{}\n",
2040                                 sha1_to_hex(o->sha1), ls->dentry_name);
2041                         fwrite_buffer(ref_info, 1, len, buf);
2042                         free(ref_info);
2043                 }
2044         }
2045 }
2046
2047 static void update_remote_info_refs(struct remote_lock *lock)
2048 {
2049         struct buffer buffer;
2050         struct active_request_slot *slot;
2051         struct slot_results results;
2052         char *if_header;
2053         struct curl_slist *dav_headers = NULL;
2054
2055         buffer.buffer = xcalloc(1, 4096);
2056         buffer.size = 4096;
2057         buffer.posn = 0;
2058         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2059                   add_remote_info_ref, &buffer);
2060         if (!aborted) {
2061                 if_header = xmalloc(strlen(lock->token) + 25);
2062                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2063                 dav_headers = curl_slist_append(dav_headers, if_header);
2064
2065                 slot = get_active_slot();
2066                 slot->results = &results;
2067                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2068                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2069                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2070                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2071                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2072                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2073                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2074                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2075                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2076
2077                 buffer.posn = 0;
2078
2079                 if (start_active_slot(slot)) {
2080                         run_active_slot(slot);
2081                         if (results.curl_result != CURLE_OK) {
2082                                 fprintf(stderr,
2083                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2084                                         results.curl_result, results.http_code);
2085                         }
2086                 }
2087                 free(if_header);
2088         }
2089         free(buffer.buffer);
2090 }
2091
2092 static int remote_exists(const char *path)
2093 {
2094         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2095         struct active_request_slot *slot;
2096         struct slot_results results;
2097
2098         sprintf(url, "%s%s", remote->url, path);
2099
2100         slot = get_active_slot();
2101         slot->results = &results;
2102         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2103         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2104
2105         if (start_active_slot(slot)) {
2106                 run_active_slot(slot);
2107                 if (results.http_code == 404)
2108                         return 0;
2109                 else if (results.curl_result == CURLE_OK)
2110                         return 1;
2111                 else
2112                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2113         } else {
2114                 fprintf(stderr, "Unable to start HEAD request\n");
2115         }
2116
2117         return -1;
2118 }
2119
2120 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2121 {
2122         char *url;
2123         struct buffer buffer;
2124         struct active_request_slot *slot;
2125         struct slot_results results;
2126
2127         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2128         sprintf(url, "%s%s", remote->url, path);
2129
2130         buffer.size = 4096;
2131         buffer.posn = 0;
2132         buffer.buffer = xmalloc(buffer.size);
2133
2134         slot = get_active_slot();
2135         slot->results = &results;
2136         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2137         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2138         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2139         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2140         if (start_active_slot(slot)) {
2141                 run_active_slot(slot);
2142                 if (results.curl_result != CURLE_OK) {
2143                         die("Couldn't get %s for remote symref\n%s",
2144                             url, curl_errorstr);
2145                 }
2146         } else {
2147                 die("Unable to start remote symref request");
2148         }
2149         free(url);
2150
2151         if (*symref != NULL)
2152                 free(*symref);
2153         *symref = NULL;
2154         hashclr(sha1);
2155
2156         if (buffer.posn == 0)
2157                 return;
2158
2159         /* If it's a symref, set the refname; otherwise try for a sha1 */
2160         if (!prefixcmp((char *)buffer.buffer, "ref: ")) {
2161                 *symref = xmemdupz((char *)buffer.buffer + 5, buffer.posn - 6);
2162         } else {
2163                 get_sha1_hex(buffer.buffer, sha1);
2164         }
2165
2166         free(buffer.buffer);
2167 }
2168
2169 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2170 {
2171         struct commit *head = lookup_commit(head_sha1);
2172         struct commit *branch = lookup_commit(branch_sha1);
2173         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2174
2175         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2176 }
2177
2178 static int delete_remote_branch(char *pattern, int force)
2179 {
2180         struct ref *refs = remote_refs;
2181         struct ref *remote_ref = NULL;
2182         unsigned char head_sha1[20];
2183         char *symref = NULL;
2184         int match;
2185         int patlen = strlen(pattern);
2186         int i;
2187         struct active_request_slot *slot;
2188         struct slot_results results;
2189         char *url;
2190
2191         /* Find the remote branch(es) matching the specified branch name */
2192         for (match = 0; refs; refs = refs->next) {
2193                 char *name = refs->name;
2194                 int namelen = strlen(name);
2195                 if (namelen < patlen ||
2196                     memcmp(name + namelen - patlen, pattern, patlen))
2197                         continue;
2198                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2199                         continue;
2200                 match++;
2201                 remote_ref = refs;
2202         }
2203         if (match == 0)
2204                 return error("No remote branch matches %s", pattern);
2205         if (match != 1)
2206                 return error("More than one remote branch matches %s",
2207                              pattern);
2208
2209         /*
2210          * Remote HEAD must be a symref (not exactly foolproof; a remote
2211          * symlink to a symref will look like a symref)
2212          */
2213         fetch_symref("HEAD", &symref, head_sha1);
2214         if (!symref)
2215                 return error("Remote HEAD is not a symref");
2216
2217         /* Remote branch must not be the remote HEAD */
2218         for (i=0; symref && i<MAXDEPTH; i++) {
2219                 if (!strcmp(remote_ref->name, symref))
2220                         return error("Remote branch %s is the current HEAD",
2221                                      remote_ref->name);
2222                 fetch_symref(symref, &symref, head_sha1);
2223         }
2224
2225         /* Run extra sanity checks if delete is not forced */
2226         if (!force) {
2227                 /* Remote HEAD must resolve to a known object */
2228                 if (symref)
2229                         return error("Remote HEAD symrefs too deep");
2230                 if (is_zero_sha1(head_sha1))
2231                         return error("Unable to resolve remote HEAD");
2232                 if (!has_sha1_file(head_sha1))
2233                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2234
2235                 /* Remote branch must resolve to a known object */
2236                 if (is_zero_sha1(remote_ref->old_sha1))
2237                         return error("Unable to resolve remote branch %s",
2238                                      remote_ref->name);
2239                 if (!has_sha1_file(remote_ref->old_sha1))
2240                         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));
2241
2242                 /* Remote branch must be an ancestor of remote HEAD */
2243                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2244                         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);
2245                 }
2246         }
2247
2248         /* Send delete request */
2249         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2250         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2251         sprintf(url, "%s%s", remote->url, remote_ref->name);
2252         slot = get_active_slot();
2253         slot->results = &results;
2254         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2255         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2256         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2257         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2258         if (start_active_slot(slot)) {
2259                 run_active_slot(slot);
2260                 free(url);
2261                 if (results.curl_result != CURLE_OK)
2262                         return error("DELETE request failed (%d/%ld)\n",
2263                                      results.curl_result, results.http_code);
2264         } else {
2265                 free(url);
2266                 return error("Unable to start DELETE request");
2267         }
2268
2269         return 0;
2270 }
2271
2272 int main(int argc, char **argv)
2273 {
2274         struct transfer_request *request;
2275         struct transfer_request *next_request;
2276         int nr_refspec = 0;
2277         char **refspec = NULL;
2278         struct remote_lock *ref_lock = NULL;
2279         struct remote_lock *info_ref_lock = NULL;
2280         struct rev_info revs;
2281         int delete_branch = 0;
2282         int force_delete = 0;
2283         int objects_to_send;
2284         int rc = 0;
2285         int i;
2286         int new_refs;
2287         struct ref *ref;
2288
2289         setup_git_directory();
2290
2291         remote = xcalloc(sizeof(*remote), 1);
2292
2293         argv++;
2294         for (i = 1; i < argc; i++, argv++) {
2295                 char *arg = *argv;
2296
2297                 if (*arg == '-') {
2298                         if (!strcmp(arg, "--all")) {
2299                                 push_all = 1;
2300                                 continue;
2301                         }
2302                         if (!strcmp(arg, "--force")) {
2303                                 force_all = 1;
2304                                 continue;
2305                         }
2306                         if (!strcmp(arg, "--dry-run")) {
2307                                 dry_run = 1;
2308                                 continue;
2309                         }
2310                         if (!strcmp(arg, "--verbose")) {
2311                                 push_verbosely = 1;
2312                                 continue;
2313                         }
2314                         if (!strcmp(arg, "-d")) {
2315                                 delete_branch = 1;
2316                                 continue;
2317                         }
2318                         if (!strcmp(arg, "-D")) {
2319                                 delete_branch = 1;
2320                                 force_delete = 1;
2321                                 continue;
2322                         }
2323                 }
2324                 if (!remote->url) {
2325                         char *path = strstr(arg, "//");
2326                         remote->url = arg;
2327                         if (path) {
2328                                 path = strchr(path+2, '/');
2329                                 if (path)
2330                                         remote->path_len = strlen(path);
2331                         }
2332                         continue;
2333                 }
2334                 refspec = argv;
2335                 nr_refspec = argc - i;
2336                 break;
2337         }
2338
2339         if (!remote->url)
2340                 usage(http_push_usage);
2341
2342         if (delete_branch && nr_refspec != 1)
2343                 die("You must specify only one branch name when deleting a remote branch");
2344
2345         memset(remote_dir_exists, -1, 256);
2346
2347         http_init();
2348
2349         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2350         default_headers = curl_slist_append(default_headers, "Range:");
2351         default_headers = curl_slist_append(default_headers, "Destination:");
2352         default_headers = curl_slist_append(default_headers, "If:");
2353         default_headers = curl_slist_append(default_headers,
2354                                             "Pragma: no-cache");
2355
2356         /* Verify DAV compliance/lock support */
2357         if (!locking_available()) {
2358                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2359                 rc = 1;
2360                 goto cleanup;
2361         }
2362
2363         /* Check whether the remote has server info files */
2364         remote->can_update_info_refs = 0;
2365         remote->has_info_refs = remote_exists("info/refs");
2366         remote->has_info_packs = remote_exists("objects/info/packs");
2367         if (remote->has_info_refs) {
2368                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2369                 if (info_ref_lock)
2370                         remote->can_update_info_refs = 1;
2371         }
2372         if (remote->has_info_packs)
2373                 fetch_indices();
2374
2375         /* Get a list of all local and remote heads to validate refspecs */
2376         get_local_heads();
2377         fprintf(stderr, "Fetching remote heads...\n");
2378         get_dav_remote_heads();
2379
2380         /* Remove a remote branch if -d or -D was specified */
2381         if (delete_branch) {
2382                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2383                         fprintf(stderr, "Unable to delete remote branch %s\n",
2384                                 refspec[0]);
2385                 goto cleanup;
2386         }
2387
2388         /* match them up */
2389         if (!remote_tail)
2390                 remote_tail = &remote_refs;
2391         if (match_refs(local_refs, remote_refs, &remote_tail,
2392                        nr_refspec, refspec, push_all))
2393                 return -1;
2394         if (!remote_refs) {
2395                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2396                 return 0;
2397         }
2398
2399         new_refs = 0;
2400         for (ref = remote_refs; ref; ref = ref->next) {
2401                 char old_hex[60], *new_hex;
2402                 const char *commit_argv[4];
2403                 int commit_argc;
2404                 char *new_sha1_hex, *old_sha1_hex;
2405
2406                 if (!ref->peer_ref)
2407                         continue;
2408                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2409                         if (push_verbosely || 1)
2410                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2411                         continue;
2412                 }
2413
2414                 if (!force_all &&
2415                     !is_zero_sha1(ref->old_sha1) &&
2416                     !ref->force) {
2417                         if (!has_sha1_file(ref->old_sha1) ||
2418                             !ref_newer(ref->peer_ref->new_sha1,
2419                                        ref->old_sha1)) {
2420                                 /* We do not have the remote ref, or
2421                                  * we know that the remote ref is not
2422                                  * an ancestor of what we are trying to
2423                                  * push.  Either way this can be losing
2424                                  * commits at the remote end and likely
2425                                  * we were not up to date to begin with.
2426                                  */
2427                                 error("remote '%s' is not a strict "
2428                                       "subset of local ref '%s'. "
2429                                       "maybe you are not up-to-date and "
2430                                       "need to pull first?",
2431                                       ref->name,
2432                                       ref->peer_ref->name);
2433                                 rc = -2;
2434                                 continue;
2435                         }
2436                 }
2437                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2438                 if (is_zero_sha1(ref->new_sha1)) {
2439                         error("cannot happen anymore");
2440                         rc = -3;
2441                         continue;
2442                 }
2443                 new_refs++;
2444                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2445                 new_hex = sha1_to_hex(ref->new_sha1);
2446
2447                 fprintf(stderr, "updating '%s'", ref->name);
2448                 if (strcmp(ref->name, ref->peer_ref->name))
2449                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2450                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2451                 if (dry_run)
2452                         continue;
2453
2454                 /* Lock remote branch ref */
2455                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2456                 if (ref_lock == NULL) {
2457                         fprintf(stderr, "Unable to lock remote branch %s\n",
2458                                 ref->name);
2459                         rc = 1;
2460                         continue;
2461                 }
2462
2463                 /* Set up revision info for this refspec */
2464                 commit_argc = 3;
2465                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2466                 old_sha1_hex = NULL;
2467                 commit_argv[1] = "--objects";
2468                 commit_argv[2] = new_sha1_hex;
2469                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2470                         old_sha1_hex = xmalloc(42);
2471                         sprintf(old_sha1_hex, "^%s",
2472                                 sha1_to_hex(ref->old_sha1));
2473                         commit_argv[3] = old_sha1_hex;
2474                         commit_argc++;
2475                 }
2476                 init_revisions(&revs, setup_git_directory());
2477                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2478                 free(new_sha1_hex);
2479                 if (old_sha1_hex) {
2480                         free(old_sha1_hex);
2481                         commit_argv[1] = NULL;
2482                 }
2483
2484                 /* Generate a list of objects that need to be pushed */
2485                 pushing = 0;
2486                 prepare_revision_walk(&revs);
2487                 mark_edges_uninteresting(revs.commits);
2488                 objects_to_send = get_delta(&revs, ref_lock);
2489                 finish_all_active_slots();
2490
2491                 /* Push missing objects to remote, this would be a
2492                    convenient time to pack them first if appropriate. */
2493                 pushing = 1;
2494                 if (objects_to_send)
2495                         fprintf(stderr, "    sending %d objects\n",
2496                                 objects_to_send);
2497 #ifdef USE_CURL_MULTI
2498                 fill_active_slots();
2499                 add_fill_function(NULL, fill_active_slot);
2500 #endif
2501                 finish_all_active_slots();
2502
2503                 /* Update the remote branch if all went well */
2504                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2505                         rc = 1;
2506                         goto unlock;
2507                 }
2508
2509         unlock:
2510                 if (!rc)
2511                         fprintf(stderr, "    done\n");
2512                 unlock_remote(ref_lock);
2513                 check_locks();
2514         }
2515
2516         /* Update remote server info if appropriate */
2517         if (remote->has_info_refs && new_refs) {
2518                 if (info_ref_lock && remote->can_update_info_refs) {
2519                         fprintf(stderr, "Updating remote server info\n");
2520                         if (!dry_run)
2521                                 update_remote_info_refs(info_ref_lock);
2522                 } else {
2523                         fprintf(stderr, "Unable to update server info\n");
2524                 }
2525         }
2526         if (info_ref_lock)
2527                 unlock_remote(info_ref_lock);
2528
2529  cleanup:
2530         free(remote);
2531
2532         curl_slist_free_all(no_pragma_header);
2533         curl_slist_free_all(default_headers);
2534
2535         http_cleanup();
2536
2537         request = request_queue_head;
2538         while (request != NULL) {
2539                 next_request = request->next;
2540                 release_request(request);
2541                 request = next_request;
2542         }
2543
2544         return rc;
2545 }