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 = MATCH_REFS_NONE;
  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                         request->tmpfile);
 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                 free(url);
 929                 return error("Unable to start request");
 930         }
 931
 932         if (has_pack_index(sha1)) {
 933                 free(url);
 934                 return 0;
 935         }
 936
 937         if (push_verbosely)
 938                 fprintf(stderr, "Getting index for pack %s\n", hex);
 939
 940         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 941
 942         filename = sha1_pack_index_name(sha1);
 943         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 944         indexfile = fopen(tmpfile, "a");
 945         if (!indexfile) {
 946                 free(url);
 947                 return error("Unable to open local file %s for pack index",
 948                              tmpfile);
 949         }
 950
 951         slot = get_active_slot();
 952         slot->results = &results;
 953         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 954         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 955         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 956         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 957         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 958         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 959         slot->local = indexfile;
 960
 961         /* If there is data present from a previous transfer attempt,
 962            resume where it left off */
 963         prev_posn = ftell(indexfile);
 964         if (prev_posn>0) {
 965                 if (push_verbosely)
 966                         fprintf(stderr,
 967                                 "Resuming fetch of index for pack %s at byte %ld\n",
 968                                 hex, prev_posn);
 969                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 970                 range_header = curl_slist_append(range_header, range);
 971                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 972         }
 973
 974         if (start_active_slot(slot)) {
 975                 run_active_slot(slot);
 976                 if (results.curl_result != CURLE_OK) {
 977                         free(url);
 978                         fclose(indexfile);
 979                         return error("Unable to get pack index %s\n%s", url,
 980                                      curl_errorstr);
 981                 }
 982         } else {
 983                 free(url);
 984                 fclose(indexfile);
 985                 return error("Unable to start request");
 986         }
 987
 988         free(url);
 989         fclose(indexfile);
 990
 991         return move_temp_to_file(tmpfile, filename);
 992 }
 993
 994 static int setup_index(unsigned char *sha1)
 995 {
 996         struct packed_git *new_pack;
 997
 998         if (fetch_index(sha1))
 999                 return -1;
1000
1001         new_pack = parse_pack_index(sha1);
1002         new_pack->next = remote->packs;
1003         remote->packs = new_pack;
1004         return 0;
1005 }
1006
1007 static int fetch_indices(void)
1008 {
1009         unsigned char sha1[20];
1010         char *url;
1011         struct buffer buffer;
1012         char *data;
1013         int i = 0;
1014
1015         struct active_request_slot *slot;
1016         struct slot_results results;
1017
1018         data = xcalloc(1, 4096);
1019         buffer.size = 4096;
1020         buffer.posn = 0;
1021         buffer.buffer = data;
1022
1023         if (push_verbosely)
1024                 fprintf(stderr, "Getting pack list\n");
1025
1026         url = xmalloc(strlen(remote->url) + 20);
1027         sprintf(url, "%sobjects/info/packs", remote->url);
1028
1029         slot = get_active_slot();
1030         slot->results = &results;
1031         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1032         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1033         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1034         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1035         if (start_active_slot(slot)) {
1036                 run_active_slot(slot);
1037                 if (results.curl_result != CURLE_OK) {
1038                         free(buffer.buffer);
1039                         free(url);
1040                         if (results.http_code == 404)
1041                                 return 0;
1042                         else
1043                                 return error("%s", curl_errorstr);
1044                 }
1045         } else {
1046                 free(buffer.buffer);
1047                 free(url);
1048                 return error("Unable to start request");
1049         }
1050         free(url);
1051
1052         data = buffer.buffer;
1053         while (i < buffer.posn) {
1054                 switch (data[i]) {
1055                 case 'P':
1056                         i++;
1057                         if (i + 52 < buffer.posn &&
1058                             !prefixcmp(data + i, " pack-") &&
1059                             !prefixcmp(data + i + 46, ".pack\n")) {
1060                                 get_sha1_hex(data + i + 6, sha1);
1061                                 setup_index(sha1);
1062                                 i += 51;
1063                                 break;
1064                         }
1065                 default:
1066                         while (data[i] != '\n')
1067                                 i++;
1068                 }
1069                 i++;
1070         }
1071
1072         free(buffer.buffer);
1073         return 0;
1074 }
1075
1076 static inline int needs_quote(int ch)
1077 {
1078         if (((ch >= 'A') && (ch <= 'Z'))
1079                         || ((ch >= 'a') && (ch <= 'z'))
1080                         || ((ch >= '0') && (ch <= '9'))
1081                         || (ch == '/')
1082                         || (ch == '-')
1083                         || (ch == '.'))
1084                 return 0;
1085         return 1;
1086 }
1087
1088 static inline int hex(int v)
1089 {
1090         if (v < 10) return '0' + v;
1091         else return 'A' + v - 10;
1092 }
1093
1094 static char *quote_ref_url(const char *base, const char *ref)
1095 {
1096         const char *cp;
1097         char *dp, *qref;
1098         int len, baselen, ch;
1099
1100         baselen = strlen(base);
1101         len = baselen + 1;
1102         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1103                 if (needs_quote(ch))
1104                         len += 2; /* extra two hex plus replacement % */
1105         qref = xmalloc(len);
1106         memcpy(qref, base, baselen);
1107         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1108                 if (needs_quote(ch)) {
1109                         *dp++ = '%';
1110                         *dp++ = hex((ch >> 4) & 0xF);
1111                         *dp++ = hex(ch & 0xF);
1112                 }
1113                 else
1114                         *dp++ = ch;
1115         }
1116         *dp = 0;
1117
1118         return qref;
1119 }
1120
1121 int fetch_ref(char *ref, unsigned char *sha1)
1122 {
1123         char *url;
1124         char hex[42];
1125         struct buffer buffer;
1126         char *base = remote->url;
1127         struct active_request_slot *slot;
1128         struct slot_results results;
1129         buffer.size = 41;
1130         buffer.posn = 0;
1131         buffer.buffer = hex;
1132         hex[41] = '\0';
1133
1134         url = quote_ref_url(base, ref);
1135         slot = get_active_slot();
1136         slot->results = &results;
1137         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1138         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1139         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1140         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1141         if (start_active_slot(slot)) {
1142                 run_active_slot(slot);
1143                 free(url);
1144                 if (results.curl_result != CURLE_OK)
1145                         return error("Couldn't get %s for %s\n%s",
1146                                      url, ref, curl_errorstr);
1147         } else {
1148                 free(url);
1149                 return error("Unable to start request");
1150         }
1151
1152         if (buffer.posn != 41)
1153                 return 1;
1154         hex[40] = '\0';
1155         return get_sha1_hex(hex, sha1);
1156 }
1157
1158 static void one_remote_object(const char *hex)
1159 {
1160         unsigned char sha1[20];
1161         struct object *obj;
1162
1163         if (get_sha1_hex(hex, sha1) != 0)
1164                 return;
1165
1166         obj = lookup_object(sha1);
1167         if (!obj)
1168                 obj = parse_object(sha1);
1169
1170         /* Ignore remote objects that don't exist locally */
1171         if (!obj)
1172                 return;
1173
1174         obj->flags |= REMOTE;
1175         if (!object_list_contains(objects, obj))
1176                 object_list_insert(obj, &objects);
1177 }
1178
1179 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1180 {
1181         int *lock_flags = (int *)ctx->userData;
1182
1183         if (tag_closed) {
1184                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1185                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1186                             (*lock_flags & DAV_PROP_LOCKWR)) {
1187                                 *lock_flags |= DAV_LOCK_OK;
1188                         }
1189                         *lock_flags &= DAV_LOCK_OK;
1190                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1191                         *lock_flags |= DAV_PROP_LOCKWR;
1192                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1193                         *lock_flags |= DAV_PROP_LOCKEX;
1194                 }
1195         }
1196 }
1197
1198 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1199 {
1200         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1201
1202         if (tag_closed && ctx->cdata) {
1203                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1204                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1205                         strcpy(lock->owner, ctx->cdata);
1206                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1207                         if (!prefixcmp(ctx->cdata, "Second-"))
1208                                 lock->timeout =
1209                                         strtol(ctx->cdata + 7, NULL, 10);
1210                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1211                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1212                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1213                                 strcpy(lock->token, ctx->cdata + 16);
1214                         }
1215                 }
1216         }
1217 }
1218
1219 static void one_remote_ref(char *refname);
1220
1221 static void
1222 xml_start_tag(void *userData, const char *name, const char **atts)
1223 {
1224         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1225         const char *c = strchr(name, ':');
1226         int new_len;
1227
1228         if (c == NULL)
1229                 c = name;
1230         else
1231                 c++;
1232
1233         new_len = strlen(ctx->name) + strlen(c) + 2;
1234
1235         if (new_len > ctx->len) {
1236                 ctx->name = xrealloc(ctx->name, new_len);
1237                 ctx->len = new_len;
1238         }
1239         strcat(ctx->name, ".");
1240         strcat(ctx->name, c);
1241
1242         free(ctx->cdata);
1243         ctx->cdata = NULL;
1244
1245         ctx->userFunc(ctx, 0);
1246 }
1247
1248 static void
1249 xml_end_tag(void *userData, const char *name)
1250 {
1251         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1252         const char *c = strchr(name, ':');
1253         char *ep;
1254
1255         ctx->userFunc(ctx, 1);
1256
1257         if (c == NULL)
1258                 c = name;
1259         else
1260                 c++;
1261
1262         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1263         *ep = 0;
1264 }
1265
1266 static void
1267 xml_cdata(void *userData, const XML_Char *s, int len)
1268 {
1269         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1270         free(ctx->cdata);
1271         ctx->cdata = xmemdupz(s, len);
1272 }
1273
1274 static struct remote_lock *lock_remote(const char *path, long timeout)
1275 {
1276         struct active_request_slot *slot;
1277         struct slot_results results;
1278         struct buffer out_buffer;
1279         struct buffer in_buffer;
1280         char *out_data;
1281         char *in_data;
1282         char *url;
1283         char *ep;
1284         char timeout_header[25];
1285         struct remote_lock *lock = NULL;
1286         struct curl_slist *dav_headers = NULL;
1287         struct xml_ctx ctx;
1288
1289         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1290         sprintf(url, "%s%s", remote->url, path);
1291
1292         /* Make sure leading directories exist for the remote ref */
1293         ep = strchr(url + strlen(remote->url) + 1, '/');
1294         while (ep) {
1295                 *ep = 0;
1296                 slot = get_active_slot();
1297                 slot->results = &results;
1298                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1299                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1300                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1301                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1302                 if (start_active_slot(slot)) {
1303                         run_active_slot(slot);
1304                         if (results.curl_result != CURLE_OK &&
1305                             results.http_code != 405) {
1306                                 fprintf(stderr,
1307                                         "Unable to create branch path %s\n",
1308                                         url);
1309                                 free(url);
1310                                 return NULL;
1311                         }
1312                 } else {
1313                         fprintf(stderr, "Unable to start MKCOL request\n");
1314                         free(url);
1315                         return NULL;
1316                 }
1317                 *ep = '/';
1318                 ep = strchr(ep + 1, '/');
1319         }
1320
1321         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1322         out_data = xmalloc(out_buffer.size + 1);
1323         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1324         out_buffer.posn = 0;
1325         out_buffer.buffer = out_data;
1326
1327         in_buffer.size = 4096;
1328         in_data = xmalloc(in_buffer.size);
1329         in_buffer.posn = 0;
1330         in_buffer.buffer = in_data;
1331
1332         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1333         dav_headers = curl_slist_append(dav_headers, timeout_header);
1334         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1335
1336         slot = get_active_slot();
1337         slot->results = &results;
1338         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1339         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1340         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1341         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1342         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1343         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1344         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1345         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1346         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1347
1348         lock = xcalloc(1, sizeof(*lock));
1349         lock->timeout = -1;
1350
1351         if (start_active_slot(slot)) {
1352                 run_active_slot(slot);
1353                 if (results.curl_result == CURLE_OK) {
1354                         XML_Parser parser = XML_ParserCreate(NULL);
1355                         enum XML_Status result;
1356                         ctx.name = xcalloc(10, 1);
1357                         ctx.len = 0;
1358                         ctx.cdata = NULL;
1359                         ctx.userFunc = handle_new_lock_ctx;
1360                         ctx.userData = lock;
1361                         XML_SetUserData(parser, &ctx);
1362                         XML_SetElementHandler(parser, xml_start_tag,
1363                                               xml_end_tag);
1364                         XML_SetCharacterDataHandler(parser, xml_cdata);
1365                         result = XML_Parse(parser, in_buffer.buffer,
1366                                            in_buffer.posn, 1);
1367                         free(ctx.name);
1368                         if (result != XML_STATUS_OK) {
1369                                 fprintf(stderr, "XML error: %s\n",
1370                                         XML_ErrorString(
1371                                                 XML_GetErrorCode(parser)));
1372                                 lock->timeout = -1;
1373                         }
1374                         XML_ParserFree(parser);
1375                 }
1376         } else {
1377                 fprintf(stderr, "Unable to start LOCK request\n");
1378         }
1379
1380         curl_slist_free_all(dav_headers);
1381         free(out_data);
1382         free(in_data);
1383
1384         if (lock->token == NULL || lock->timeout <= 0) {
1385                 if (lock->token != NULL)
1386                         free(lock->token);
1387                 if (lock->owner != NULL)
1388                         free(lock->owner);
1389                 free(url);
1390                 free(lock);
1391                 lock = NULL;
1392         } else {
1393                 lock->url = url;
1394                 lock->start_time = time(NULL);
1395                 lock->next = remote->locks;
1396                 remote->locks = lock;
1397         }
1398
1399         return lock;
1400 }
1401
1402 static int unlock_remote(struct remote_lock *lock)
1403 {
1404         struct active_request_slot *slot;
1405         struct slot_results results;
1406         struct remote_lock *prev = remote->locks;
1407         char *lock_token_header;
1408         struct curl_slist *dav_headers = NULL;
1409         int rc = 0;
1410
1411         lock_token_header = xmalloc(strlen(lock->token) + 31);
1412         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1413                 lock->token);
1414         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1415
1416         slot = get_active_slot();
1417         slot->results = &results;
1418         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1419         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1420         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1421         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1422
1423         if (start_active_slot(slot)) {
1424                 run_active_slot(slot);
1425                 if (results.curl_result == CURLE_OK)
1426                         rc = 1;
1427                 else
1428                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1429                                 results.http_code);
1430         } else {
1431                 fprintf(stderr, "Unable to start UNLOCK request\n");
1432         }
1433
1434         curl_slist_free_all(dav_headers);
1435         free(lock_token_header);
1436
1437         if (remote->locks == lock) {
1438                 remote->locks = lock->next;
1439         } else {
1440                 while (prev && prev->next != lock)
1441                         prev = prev->next;
1442                 if (prev)
1443                         prev->next = prev->next->next;
1444         }
1445
1446         if (lock->owner != NULL)
1447                 free(lock->owner);
1448         free(lock->url);
1449         free(lock->token);
1450         free(lock);
1451
1452         return rc;
1453 }
1454
1455 static void remote_ls(const char *path, int flags,
1456                       void (*userFunc)(struct remote_ls_ctx *ls),
1457                       void *userData);
1458
1459 static void process_ls_object(struct remote_ls_ctx *ls)
1460 {
1461         unsigned int *parent = (unsigned int *)ls->userData;
1462         char *path = ls->dentry_name;
1463         char *obj_hex;
1464
1465         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1466                 remote_dir_exists[*parent] = 1;
1467                 return;
1468         }
1469
1470         if (strlen(path) != 49)
1471                 return;
1472         path += 8;
1473         obj_hex = xmalloc(strlen(path));
1474         /* NB: path is not null-terminated, can not use strlcpy here */
1475         memcpy(obj_hex, path, 2);
1476         strcpy(obj_hex + 2, path + 3);
1477         one_remote_object(obj_hex);
1478         free(obj_hex);
1479 }
1480
1481 static void process_ls_ref(struct remote_ls_ctx *ls)
1482 {
1483         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1484                 fprintf(stderr, "  %s\n", ls->dentry_name);
1485                 return;
1486         }
1487
1488         if (!(ls->dentry_flags & IS_DIR))
1489                 one_remote_ref(ls->dentry_name);
1490 }
1491
1492 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1493 {
1494         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1495
1496         if (tag_closed) {
1497                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1498                         if (ls->dentry_flags & IS_DIR) {
1499                                 if (ls->flags & PROCESS_DIRS) {
1500                                         ls->userFunc(ls);
1501                                 }
1502                                 if (strcmp(ls->dentry_name, ls->path) &&
1503                                     ls->flags & RECURSIVE) {
1504                                         remote_ls(ls->dentry_name,
1505                                                   ls->flags,
1506                                                   ls->userFunc,
1507                                                   ls->userData);
1508                                 }
1509                         } else if (ls->flags & PROCESS_FILES) {
1510                                 ls->userFunc(ls);
1511                         }
1512                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1513                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1514                                                   remote->path_len + 1);
1515                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1516                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1517                         ls->dentry_flags |= IS_DIR;
1518                 }
1519         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1520                 free(ls->dentry_name);
1521                 ls->dentry_name = NULL;
1522                 ls->dentry_flags = 0;
1523         }
1524 }
1525
1526 static void remote_ls(const char *path, int flags,
1527                       void (*userFunc)(struct remote_ls_ctx *ls),
1528                       void *userData)
1529 {
1530         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1531         struct active_request_slot *slot;
1532         struct slot_results results;
1533         struct buffer in_buffer;
1534         struct buffer out_buffer;
1535         char *in_data;
1536         char *out_data;
1537         struct curl_slist *dav_headers = NULL;
1538         struct xml_ctx ctx;
1539         struct remote_ls_ctx ls;
1540
1541         ls.flags = flags;
1542         ls.path = xstrdup(path);
1543         ls.dentry_name = NULL;
1544         ls.dentry_flags = 0;
1545         ls.userData = userData;
1546         ls.userFunc = userFunc;
1547
1548         sprintf(url, "%s%s", remote->url, path);
1549
1550         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1551         out_data = xmalloc(out_buffer.size + 1);
1552         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1553         out_buffer.posn = 0;
1554         out_buffer.buffer = out_data;
1555
1556         in_buffer.size = 4096;
1557         in_data = xmalloc(in_buffer.size);
1558         in_buffer.posn = 0;
1559         in_buffer.buffer = in_data;
1560
1561         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1562         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1563
1564         slot = get_active_slot();
1565         slot->results = &results;
1566         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1567         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1568         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1569         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1571         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1572         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1573         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1574         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1575
1576         if (start_active_slot(slot)) {
1577                 run_active_slot(slot);
1578                 if (results.curl_result == CURLE_OK) {
1579                         XML_Parser parser = XML_ParserCreate(NULL);
1580                         enum XML_Status result;
1581                         ctx.name = xcalloc(10, 1);
1582                         ctx.len = 0;
1583                         ctx.cdata = NULL;
1584                         ctx.userFunc = handle_remote_ls_ctx;
1585                         ctx.userData = &ls;
1586                         XML_SetUserData(parser, &ctx);
1587                         XML_SetElementHandler(parser, xml_start_tag,
1588                                               xml_end_tag);
1589                         XML_SetCharacterDataHandler(parser, xml_cdata);
1590                         result = XML_Parse(parser, in_buffer.buffer,
1591                                            in_buffer.posn, 1);
1592                         free(ctx.name);
1593
1594                         if (result != XML_STATUS_OK) {
1595                                 fprintf(stderr, "XML error: %s\n",
1596                                         XML_ErrorString(
1597                                                 XML_GetErrorCode(parser)));
1598                         }
1599                         XML_ParserFree(parser);
1600                 }
1601         } else {
1602                 fprintf(stderr, "Unable to start PROPFIND request\n");
1603         }
1604
1605         free(ls.path);
1606         free(url);
1607         free(out_data);
1608         free(in_buffer.buffer);
1609         curl_slist_free_all(dav_headers);
1610 }
1611
1612 static void get_remote_object_list(unsigned char parent)
1613 {
1614         char path[] = "objects/XX/";
1615         static const char hex[] = "0123456789abcdef";
1616         unsigned int val = parent;
1617
1618         path[8] = hex[val >> 4];
1619         path[9] = hex[val & 0xf];
1620         remote_dir_exists[val] = 0;
1621         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1622                   process_ls_object, &val);
1623 }
1624
1625 static int locking_available(void)
1626 {
1627         struct active_request_slot *slot;
1628         struct slot_results results;
1629         struct buffer in_buffer;
1630         struct buffer out_buffer;
1631         char *in_data;
1632         char *out_data;
1633         struct curl_slist *dav_headers = NULL;
1634         struct xml_ctx ctx;
1635         int lock_flags = 0;
1636
1637         out_buffer.size =
1638                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1639                 strlen(remote->url) - 2;
1640         out_data = xmalloc(out_buffer.size + 1);
1641         snprintf(out_data, out_buffer.size + 1,
1642                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1643         out_buffer.posn = 0;
1644         out_buffer.buffer = out_data;
1645
1646         in_buffer.size = 4096;
1647         in_data = xmalloc(in_buffer.size);
1648         in_buffer.posn = 0;
1649         in_buffer.buffer = in_data;
1650
1651         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1652         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1653
1654         slot = get_active_slot();
1655         slot->results = &results;
1656         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1657         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1658         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1659         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1660         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1661         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1662         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1663         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1664         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1665
1666         if (start_active_slot(slot)) {
1667                 run_active_slot(slot);
1668                 if (results.curl_result == CURLE_OK) {
1669                         XML_Parser parser = XML_ParserCreate(NULL);
1670                         enum XML_Status result;
1671                         ctx.name = xcalloc(10, 1);
1672                         ctx.len = 0;
1673                         ctx.cdata = NULL;
1674                         ctx.userFunc = handle_lockprop_ctx;
1675                         ctx.userData = &lock_flags;
1676                         XML_SetUserData(parser, &ctx);
1677                         XML_SetElementHandler(parser, xml_start_tag,
1678                                               xml_end_tag);
1679                         result = XML_Parse(parser, in_buffer.buffer,
1680                                            in_buffer.posn, 1);
1681                         free(ctx.name);
1682
1683                         if (result != XML_STATUS_OK) {
1684                                 fprintf(stderr, "XML error: %s\n",
1685                                         XML_ErrorString(
1686                                                 XML_GetErrorCode(parser)));
1687                                 lock_flags = 0;
1688                         }
1689                         XML_ParserFree(parser);
1690                 }
1691         } else {
1692                 fprintf(stderr, "Unable to start PROPFIND request\n");
1693         }
1694
1695         free(out_data);
1696         free(in_buffer.buffer);
1697         curl_slist_free_all(dav_headers);
1698
1699         return lock_flags;
1700 }
1701
1702 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1703 {
1704         struct object_list *entry = xmalloc(sizeof(struct object_list));
1705         entry->item = obj;
1706         entry->next = *p;
1707         *p = entry;
1708         return &entry->next;
1709 }
1710
1711 static struct object_list **process_blob(struct blob *blob,
1712                                          struct object_list **p,
1713                                          struct name_path *path,
1714                                          const char *name)
1715 {
1716         struct object *obj = &blob->object;
1717
1718         obj->flags |= LOCAL;
1719
1720         if (obj->flags & (UNINTERESTING | SEEN))
1721                 return p;
1722
1723         obj->flags |= SEEN;
1724         return add_one_object(obj, p);
1725 }
1726
1727 static struct object_list **process_tree(struct tree *tree,
1728                                          struct object_list **p,
1729                                          struct name_path *path,
1730                                          const char *name)
1731 {
1732         struct object *obj = &tree->object;
1733         struct tree_desc desc;
1734         struct name_entry entry;
1735         struct name_path me;
1736
1737         obj->flags |= LOCAL;
1738
1739         if (obj->flags & (UNINTERESTING | SEEN))
1740                 return p;
1741         if (parse_tree(tree) < 0)
1742                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1743
1744         obj->flags |= SEEN;
1745         name = xstrdup(name);
1746         p = add_one_object(obj, p);
1747         me.up = path;
1748         me.elem = name;
1749         me.elem_len = strlen(name);
1750
1751         init_tree_desc(&desc, tree->buffer, tree->size);
1752
1753         while (tree_entry(&desc, &entry)) {
1754                 if (S_ISDIR(entry.mode))
1755                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1756                 else
1757                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1758         }
1759         free(tree->buffer);
1760         tree->buffer = NULL;
1761         return p;
1762 }
1763
1764 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1765 {
1766         int i;
1767         struct commit *commit;
1768         struct object_list **p = &objects;
1769         int count = 0;
1770
1771         while ((commit = get_revision(revs)) != NULL) {
1772                 p = process_tree(commit->tree, p, NULL, "");
1773                 commit->object.flags |= LOCAL;
1774                 if (!(commit->object.flags & UNINTERESTING))
1775                         count += add_send_request(&commit->object, lock);
1776         }
1777
1778         for (i = 0; i < revs->pending.nr; i++) {
1779                 struct object_array_entry *entry = revs->pending.objects + i;
1780                 struct object *obj = entry->item;
1781                 const char *name = entry->name;
1782
1783                 if (obj->flags & (UNINTERESTING | SEEN))
1784                         continue;
1785                 if (obj->type == OBJ_TAG) {
1786                         obj->flags |= SEEN;
1787                         p = add_one_object(obj, p);
1788                         continue;
1789                 }
1790                 if (obj->type == OBJ_TREE) {
1791                         p = process_tree((struct tree *)obj, p, NULL, name);
1792                         continue;
1793                 }
1794                 if (obj->type == OBJ_BLOB) {
1795                         p = process_blob((struct blob *)obj, p, NULL, name);
1796                         continue;
1797                 }
1798                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1799         }
1800
1801         while (objects) {
1802                 if (!(objects->item->flags & UNINTERESTING))
1803                         count += add_send_request(objects->item, lock);
1804                 objects = objects->next;
1805         }
1806
1807         return count;
1808 }
1809
1810 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1811 {
1812         struct active_request_slot *slot;
1813         struct slot_results results;
1814         char *out_data;
1815         char *if_header;
1816         struct buffer out_buffer;
1817         struct curl_slist *dav_headers = NULL;
1818         int i;
1819
1820         if_header = xmalloc(strlen(lock->token) + 25);
1821         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1822         dav_headers = curl_slist_append(dav_headers, if_header);
1823
1824         out_buffer.size = 41;
1825         out_data = xmalloc(out_buffer.size + 1);
1826         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1827         if (i != out_buffer.size) {
1828                 fprintf(stderr, "Unable to initialize PUT request body\n");
1829                 return 0;
1830         }
1831         out_buffer.posn = 0;
1832         out_buffer.buffer = out_data;
1833
1834         slot = get_active_slot();
1835         slot->results = &results;
1836         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1837         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1838         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1839         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1840         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1841         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1842         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1843         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1844         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1845
1846         if (start_active_slot(slot)) {
1847                 run_active_slot(slot);
1848                 free(out_data);
1849                 free(if_header);
1850                 if (results.curl_result != CURLE_OK) {
1851                         fprintf(stderr,
1852                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1853                                 results.curl_result, results.http_code);
1854                         /* We should attempt recovery? */
1855                         return 0;
1856                 }
1857         } else {
1858                 free(out_data);
1859                 free(if_header);
1860                 fprintf(stderr, "Unable to start PUT request\n");
1861                 return 0;
1862         }
1863
1864         return 1;
1865 }
1866
1867 static struct ref *local_refs, **local_tail;
1868 static struct ref *remote_refs, **remote_tail;
1869
1870 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1871 {
1872         struct ref *ref;
1873         int len = strlen(refname) + 1;
1874         ref = xcalloc(1, sizeof(*ref) + len);
1875         hashcpy(ref->new_sha1, sha1);
1876         memcpy(ref->name, refname, len);
1877         *local_tail = ref;
1878         local_tail = &ref->next;
1879         return 0;
1880 }
1881
1882 static void one_remote_ref(char *refname)
1883 {
1884         struct ref *ref;
1885         unsigned char remote_sha1[20];
1886         struct object *obj;
1887         int len = strlen(refname) + 1;
1888
1889         if (fetch_ref(refname, remote_sha1) != 0) {
1890                 fprintf(stderr,
1891                         "Unable to fetch ref %s from %s\n",
1892                         refname, remote->url);
1893                 return;
1894         }
1895
1896         /*
1897          * Fetch a copy of the object if it doesn't exist locally - it
1898          * may be required for updating server info later.
1899          */
1900         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1901                 obj = lookup_unknown_object(remote_sha1);
1902                 if (obj) {
1903                         fprintf(stderr, "  fetch %s for %s\n",
1904                                 sha1_to_hex(remote_sha1), refname);
1905                         add_fetch_request(obj);
1906                 }
1907         }
1908
1909         ref = xcalloc(1, sizeof(*ref) + len);
1910         hashcpy(ref->old_sha1, remote_sha1);
1911         memcpy(ref->name, refname, len);
1912         *remote_tail = ref;
1913         remote_tail = &ref->next;
1914 }
1915
1916 static void get_local_heads(void)
1917 {
1918         local_tail = &local_refs;
1919         for_each_ref(one_local_ref, NULL);
1920 }
1921
1922 static void get_dav_remote_heads(void)
1923 {
1924         remote_tail = &remote_refs;
1925         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1926 }
1927
1928 static int is_zero_sha1(const unsigned char *sha1)
1929 {
1930         int i;
1931
1932         for (i = 0; i < 20; i++) {
1933                 if (*sha1++)
1934                         return 0;
1935         }
1936         return 1;
1937 }
1938
1939 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1940 {
1941         while (list) {
1942                 struct commit_list *temp = list;
1943                 temp->item->object.flags &= ~mark;
1944                 list = temp->next;
1945                 free(temp);
1946         }
1947 }
1948
1949 static int ref_newer(const unsigned char *new_sha1,
1950                      const unsigned char *old_sha1)
1951 {
1952         struct object *o;
1953         struct commit *old, *new;
1954         struct commit_list *list, *used;
1955         int found = 0;
1956
1957         /* Both new and old must be commit-ish and new is descendant of
1958          * old.  Otherwise we require --force.
1959          */
1960         o = deref_tag(parse_object(old_sha1), NULL, 0);
1961         if (!o || o->type != OBJ_COMMIT)
1962                 return 0;
1963         old = (struct commit *) o;
1964
1965         o = deref_tag(parse_object(new_sha1), NULL, 0);
1966         if (!o || o->type != OBJ_COMMIT)
1967                 return 0;
1968         new = (struct commit *) o;
1969
1970         if (parse_commit(new) < 0)
1971                 return 0;
1972
1973         used = list = NULL;
1974         commit_list_insert(new, &list);
1975         while (list) {
1976                 new = pop_most_recent_commit(&list, TMP_MARK);
1977                 commit_list_insert(new, &used);
1978                 if (new == old) {
1979                         found = 1;
1980                         break;
1981                 }
1982         }
1983         unmark_and_free(list, TMP_MARK);
1984         unmark_and_free(used, TMP_MARK);
1985         return found;
1986 }
1987
1988 static void mark_edge_parents_uninteresting(struct commit *commit)
1989 {
1990         struct commit_list *parents;
1991
1992         for (parents = commit->parents; parents; parents = parents->next) {
1993                 struct commit *parent = parents->item;
1994                 if (!(parent->object.flags & UNINTERESTING))
1995                         continue;
1996                 mark_tree_uninteresting(parent->tree);
1997         }
1998 }
1999
2000 static void mark_edges_uninteresting(struct commit_list *list)
2001 {
2002         for ( ; list; list = list->next) {
2003                 struct commit *commit = list->item;
2004
2005                 if (commit->object.flags & UNINTERESTING) {
2006                         mark_tree_uninteresting(commit->tree);
2007                         continue;
2008                 }
2009                 mark_edge_parents_uninteresting(commit);
2010         }
2011 }
2012
2013 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2014 {
2015         struct buffer *buf = (struct buffer *)ls->userData;
2016         unsigned char remote_sha1[20];
2017         struct object *o;
2018         int len;
2019         char *ref_info;
2020
2021         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2022                 fprintf(stderr,
2023                         "Unable to fetch ref %s from %s\n",
2024                         ls->dentry_name, remote->url);
2025                 aborted = 1;
2026                 return;
2027         }
2028
2029         o = parse_object(remote_sha1);
2030         if (!o) {
2031                 fprintf(stderr,
2032                         "Unable to parse object %s for remote ref %s\n",
2033                         sha1_to_hex(remote_sha1), ls->dentry_name);
2034                 aborted = 1;
2035                 return;
2036         }
2037
2038         len = strlen(ls->dentry_name) + 42;
2039         ref_info = xcalloc(len + 1, 1);
2040         sprintf(ref_info, "%s   %s\n",
2041                 sha1_to_hex(remote_sha1), ls->dentry_name);
2042         fwrite_buffer(ref_info, 1, len, buf);
2043         free(ref_info);
2044
2045         if (o->type == OBJ_TAG) {
2046                 o = deref_tag(o, ls->dentry_name, 0);
2047                 if (o) {
2048                         len = strlen(ls->dentry_name) + 45;
2049                         ref_info = xcalloc(len + 1, 1);
2050                         sprintf(ref_info, "%s   %s^{}\n",
2051                                 sha1_to_hex(o->sha1), ls->dentry_name);
2052                         fwrite_buffer(ref_info, 1, len, buf);
2053                         free(ref_info);
2054                 }
2055         }
2056 }
2057
2058 static void update_remote_info_refs(struct remote_lock *lock)
2059 {
2060         struct buffer buffer;
2061         struct active_request_slot *slot;
2062         struct slot_results results;
2063         char *if_header;
2064         struct curl_slist *dav_headers = NULL;
2065
2066         buffer.buffer = xcalloc(1, 4096);
2067         buffer.size = 4096;
2068         buffer.posn = 0;
2069         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2070                   add_remote_info_ref, &buffer);
2071         if (!aborted) {
2072                 if_header = xmalloc(strlen(lock->token) + 25);
2073                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2074                 dav_headers = curl_slist_append(dav_headers, if_header);
2075
2076                 slot = get_active_slot();
2077                 slot->results = &results;
2078                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2079                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2080                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2081                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2082                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2083                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2084                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2085                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2086                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2087
2088                 buffer.posn = 0;
2089
2090                 if (start_active_slot(slot)) {
2091                         run_active_slot(slot);
2092                         if (results.curl_result != CURLE_OK) {
2093                                 fprintf(stderr,
2094                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2095                                         results.curl_result, results.http_code);
2096                         }
2097                 }
2098                 free(if_header);
2099         }
2100         free(buffer.buffer);
2101 }
2102
2103 static int remote_exists(const char *path)
2104 {
2105         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2106         struct active_request_slot *slot;
2107         struct slot_results results;
2108
2109         sprintf(url, "%s%s", remote->url, path);
2110
2111         slot = get_active_slot();
2112         slot->results = &results;
2113         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2114         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2115
2116         if (start_active_slot(slot)) {
2117                 run_active_slot(slot);
2118                 free(url);
2119                 if (results.http_code == 404)
2120                         return 0;
2121                 else if (results.curl_result == CURLE_OK)
2122                         return 1;
2123                 else
2124                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2125         } else {
2126                 free(url);
2127                 fprintf(stderr, "Unable to start HEAD request\n");
2128         }
2129
2130         return -1;
2131 }
2132
2133 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2134 {
2135         char *url;
2136         struct buffer buffer;
2137         struct active_request_slot *slot;
2138         struct slot_results results;
2139
2140         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2141         sprintf(url, "%s%s", remote->url, path);
2142
2143         buffer.size = 4096;
2144         buffer.posn = 0;
2145         buffer.buffer = xmalloc(buffer.size);
2146
2147         slot = get_active_slot();
2148         slot->results = &results;
2149         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2150         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2151         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2152         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2153         if (start_active_slot(slot)) {
2154                 run_active_slot(slot);
2155                 if (results.curl_result != CURLE_OK) {
2156                         die("Couldn't get %s for remote symref\n%s",
2157                             url, curl_errorstr);
2158                 }
2159         } else {
2160                 die("Unable to start remote symref request");
2161         }
2162         free(url);
2163
2164         if (*symref != NULL)
2165                 free(*symref);
2166         *symref = NULL;
2167         hashclr(sha1);
2168
2169         if (buffer.posn == 0)
2170                 return;
2171
2172         /* If it's a symref, set the refname; otherwise try for a sha1 */
2173         if (!prefixcmp((char *)buffer.buffer, "ref: ")) {
2174                 *symref = xmemdupz((char *)buffer.buffer + 5, buffer.posn - 6);
2175         } else {
2176                 get_sha1_hex(buffer.buffer, sha1);
2177         }
2178
2179         free(buffer.buffer);
2180 }
2181
2182 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2183 {
2184         struct commit *head = lookup_commit(head_sha1);
2185         struct commit *branch = lookup_commit(branch_sha1);
2186         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2187
2188         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2189 }
2190
2191 static int delete_remote_branch(char *pattern, int force)
2192 {
2193         struct ref *refs = remote_refs;
2194         struct ref *remote_ref = NULL;
2195         unsigned char head_sha1[20];
2196         char *symref = NULL;
2197         int match;
2198         int patlen = strlen(pattern);
2199         int i;
2200         struct active_request_slot *slot;
2201         struct slot_results results;
2202         char *url;
2203
2204         /* Find the remote branch(es) matching the specified branch name */
2205         for (match = 0; refs; refs = refs->next) {
2206                 char *name = refs->name;
2207                 int namelen = strlen(name);
2208                 if (namelen < patlen ||
2209                     memcmp(name + namelen - patlen, pattern, patlen))
2210                         continue;
2211                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2212                         continue;
2213                 match++;
2214                 remote_ref = refs;
2215         }
2216         if (match == 0)
2217                 return error("No remote branch matches %s", pattern);
2218         if (match != 1)
2219                 return error("More than one remote branch matches %s",
2220                              pattern);
2221
2222         /*
2223          * Remote HEAD must be a symref (not exactly foolproof; a remote
2224          * symlink to a symref will look like a symref)
2225          */
2226         fetch_symref("HEAD", &symref, head_sha1);
2227         if (!symref)
2228                 return error("Remote HEAD is not a symref");
2229
2230         /* Remote branch must not be the remote HEAD */
2231         for (i=0; symref && i<MAXDEPTH; i++) {
2232                 if (!strcmp(remote_ref->name, symref))
2233                         return error("Remote branch %s is the current HEAD",
2234                                      remote_ref->name);
2235                 fetch_symref(symref, &symref, head_sha1);
2236         }
2237
2238         /* Run extra sanity checks if delete is not forced */
2239         if (!force) {
2240                 /* Remote HEAD must resolve to a known object */
2241                 if (symref)
2242                         return error("Remote HEAD symrefs too deep");
2243                 if (is_zero_sha1(head_sha1))
2244                         return error("Unable to resolve remote HEAD");
2245                 if (!has_sha1_file(head_sha1))
2246                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2247
2248                 /* Remote branch must resolve to a known object */
2249                 if (is_zero_sha1(remote_ref->old_sha1))
2250                         return error("Unable to resolve remote branch %s",
2251                                      remote_ref->name);
2252                 if (!has_sha1_file(remote_ref->old_sha1))
2253                         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));
2254
2255                 /* Remote branch must be an ancestor of remote HEAD */
2256                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2257                         return error("The branch '%s' is not an ancestor "
2258                                      "of your current HEAD.\n"
2259                                      "If you are sure you want to delete it,"
2260                                      " run:\n\t'git http-push -D %s %s'",
2261                                      remote_ref->name, remote->url, pattern);
2262                 }
2263         }
2264
2265         /* Send delete request */
2266         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2267         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2268         sprintf(url, "%s%s", remote->url, remote_ref->name);
2269         slot = get_active_slot();
2270         slot->results = &results;
2271         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2272         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2273         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2274         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2275         if (start_active_slot(slot)) {
2276                 run_active_slot(slot);
2277                 free(url);
2278                 if (results.curl_result != CURLE_OK)
2279                         return error("DELETE request failed (%d/%ld)\n",
2280                                      results.curl_result, results.http_code);
2281         } else {
2282                 free(url);
2283                 return error("Unable to start DELETE request");
2284         }
2285
2286         return 0;
2287 }
2288
2289 int main(int argc, char **argv)
2290 {
2291         struct transfer_request *request;
2292         struct transfer_request *next_request;
2293         int nr_refspec = 0;
2294         char **refspec = NULL;
2295         struct remote_lock *ref_lock = NULL;
2296         struct remote_lock *info_ref_lock = NULL;
2297         struct rev_info revs;
2298         int delete_branch = 0;
2299         int force_delete = 0;
2300         int objects_to_send;
2301         int rc = 0;
2302         int i;
2303         int new_refs;
2304         struct ref *ref;
2305
2306         setup_git_directory();
2307
2308         remote = xcalloc(sizeof(*remote), 1);
2309
2310         argv++;
2311         for (i = 1; i < argc; i++, argv++) {
2312                 char *arg = *argv;
2313
2314                 if (*arg == '-') {
2315                         if (!strcmp(arg, "--all")) {
2316                                 push_all = MATCH_REFS_ALL;
2317                                 continue;
2318                         }
2319                         if (!strcmp(arg, "--force")) {
2320                                 force_all = 1;
2321                                 continue;
2322                         }
2323                         if (!strcmp(arg, "--dry-run")) {
2324                                 dry_run = 1;
2325                                 continue;
2326                         }
2327                         if (!strcmp(arg, "--verbose")) {
2328                                 push_verbosely = 1;
2329                                 continue;
2330                         }
2331                         if (!strcmp(arg, "-d")) {
2332                                 delete_branch = 1;
2333                                 continue;
2334                         }
2335                         if (!strcmp(arg, "-D")) {
2336                                 delete_branch = 1;
2337                                 force_delete = 1;
2338                                 continue;
2339                         }
2340                 }
2341                 if (!remote->url) {
2342                         char *path = strstr(arg, "//");
2343                         remote->url = arg;
2344                         if (path) {
2345                                 path = strchr(path+2, '/');
2346                                 if (path)
2347                                         remote->path_len = strlen(path);
2348                         }
2349                         continue;
2350                 }
2351                 refspec = argv;
2352                 nr_refspec = argc - i;
2353                 break;
2354         }
2355
2356         if (!remote->url)
2357                 usage(http_push_usage);
2358
2359         if (delete_branch && nr_refspec != 1)
2360                 die("You must specify only one branch name when deleting a remote branch");
2361
2362         memset(remote_dir_exists, -1, 256);
2363
2364         http_init();
2365
2366         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2367         default_headers = curl_slist_append(default_headers, "Range:");
2368         default_headers = curl_slist_append(default_headers, "Destination:");
2369         default_headers = curl_slist_append(default_headers, "If:");
2370         default_headers = curl_slist_append(default_headers,
2371                                             "Pragma: no-cache");
2372
2373         /* Verify DAV compliance/lock support */
2374         if (!locking_available()) {
2375                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2376                 rc = 1;
2377                 goto cleanup;
2378         }
2379
2380         /* Check whether the remote has server info files */
2381         remote->can_update_info_refs = 0;
2382         remote->has_info_refs = remote_exists("info/refs");
2383         remote->has_info_packs = remote_exists("objects/info/packs");
2384         if (remote->has_info_refs) {
2385                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2386                 if (info_ref_lock)
2387                         remote->can_update_info_refs = 1;
2388         }
2389         if (remote->has_info_packs)
2390                 fetch_indices();
2391
2392         /* Get a list of all local and remote heads to validate refspecs */
2393         get_local_heads();
2394         fprintf(stderr, "Fetching remote heads...\n");
2395         get_dav_remote_heads();
2396
2397         /* Remove a remote branch if -d or -D was specified */
2398         if (delete_branch) {
2399                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2400                         fprintf(stderr, "Unable to delete remote branch %s\n",
2401                                 refspec[0]);
2402                 goto cleanup;
2403         }
2404
2405         /* match them up */
2406         if (!remote_tail)
2407                 remote_tail = &remote_refs;
2408         if (match_refs(local_refs, remote_refs, &remote_tail,
2409                        nr_refspec, (const char **) refspec, push_all))
2410                 return -1;
2411         if (!remote_refs) {
2412                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2413                 return 0;
2414         }
2415
2416         new_refs = 0;
2417         for (ref = remote_refs; ref; ref = ref->next) {
2418                 char old_hex[60], *new_hex;
2419                 const char *commit_argv[4];
2420                 int commit_argc;
2421                 char *new_sha1_hex, *old_sha1_hex;
2422
2423                 if (!ref->peer_ref)
2424                         continue;
2425                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2426                         if (push_verbosely || 1)
2427                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2428                         continue;
2429                 }
2430
2431                 if (!force_all &&
2432                     !is_zero_sha1(ref->old_sha1) &&
2433                     !ref->force) {
2434                         if (!has_sha1_file(ref->old_sha1) ||
2435                             !ref_newer(ref->peer_ref->new_sha1,
2436                                        ref->old_sha1)) {
2437                                 /*
2438                                  * We do not have the remote ref, or
2439                                  * we know that the remote ref is not
2440                                  * an ancestor of what we are trying to
2441                                  * push.  Either way this can be losing
2442                                  * commits at the remote end and likely
2443                                  * we were not up to date to begin with.
2444                                  */
2445                                 error("remote '%s' is not an ancestor of\n"
2446                                       "local '%s'.\n"
2447                                       "Maybe you are not up-to-date and "
2448                                       "need to pull first?",
2449                                       ref->name,
2450                                       ref->peer_ref->name);
2451                                 rc = -2;
2452                                 continue;
2453                         }
2454                 }
2455                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2456                 if (is_zero_sha1(ref->new_sha1)) {
2457                         error("cannot happen anymore");
2458                         rc = -3;
2459                         continue;
2460                 }
2461                 new_refs++;
2462                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2463                 new_hex = sha1_to_hex(ref->new_sha1);
2464
2465                 fprintf(stderr, "updating '%s'", ref->name);
2466                 if (strcmp(ref->name, ref->peer_ref->name))
2467                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2468                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2469                 if (dry_run)
2470                         continue;
2471
2472                 /* Lock remote branch ref */
2473                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2474                 if (ref_lock == NULL) {
2475                         fprintf(stderr, "Unable to lock remote branch %s\n",
2476                                 ref->name);
2477                         rc = 1;
2478                         continue;
2479                 }
2480
2481                 /* Set up revision info for this refspec */
2482                 commit_argc = 3;
2483                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2484                 old_sha1_hex = NULL;
2485                 commit_argv[1] = "--objects";
2486                 commit_argv[2] = new_sha1_hex;
2487                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2488                         old_sha1_hex = xmalloc(42);
2489                         sprintf(old_sha1_hex, "^%s",
2490                                 sha1_to_hex(ref->old_sha1));
2491                         commit_argv[3] = old_sha1_hex;
2492                         commit_argc++;
2493                 }
2494                 init_revisions(&revs, setup_git_directory());
2495                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2496                 free(new_sha1_hex);
2497                 if (old_sha1_hex) {
2498                         free(old_sha1_hex);
2499                         commit_argv[1] = NULL;
2500                 }
2501
2502                 /* Generate a list of objects that need to be pushed */
2503                 pushing = 0;
2504                 prepare_revision_walk(&revs);
2505                 mark_edges_uninteresting(revs.commits);
2506                 objects_to_send = get_delta(&revs, ref_lock);
2507                 finish_all_active_slots();
2508
2509                 /* Push missing objects to remote, this would be a
2510                    convenient time to pack them first if appropriate. */
2511                 pushing = 1;
2512                 if (objects_to_send)
2513                         fprintf(stderr, "    sending %d objects\n",
2514                                 objects_to_send);
2515 #ifdef USE_CURL_MULTI
2516                 fill_active_slots();
2517                 add_fill_function(NULL, fill_active_slot);
2518 #endif
2519                 finish_all_active_slots();
2520
2521                 /* Update the remote branch if all went well */
2522                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2523                         rc = 1;
2524                         goto unlock;
2525                 }
2526
2527         unlock:
2528                 if (!rc)
2529                         fprintf(stderr, "    done\n");
2530                 unlock_remote(ref_lock);
2531                 check_locks();
2532         }
2533
2534         /* Update remote server info if appropriate */
2535         if (remote->has_info_refs && new_refs) {
2536                 if (info_ref_lock && remote->can_update_info_refs) {
2537                         fprintf(stderr, "Updating remote server info\n");
2538                         if (!dry_run)
2539                                 update_remote_info_refs(info_ref_lock);
2540                 } else {
2541                         fprintf(stderr, "Unable to update server info\n");
2542                 }
2543         }
2544         if (info_ref_lock)
2545                 unlock_remote(info_ref_lock);
2546
2547  cleanup:
2548         free(remote);
2549
2550         curl_slist_free_all(no_pragma_header);
2551         curl_slist_free_all(default_headers);
2552
2553         http_cleanup();
2554
2555         request = request_queue_head;
2556         while (request != NULL) {
2557                 next_request = request->next;
2558                 release_request(request);
2559                 request = next_request;
2560         }
2561
2562         return rc;
2563 }