git.oblomov.eu Git - git/blob - http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5 #include "tag.h"
   6 #include "blob.h"
   7 #include "http.h"
   8 #include "refs.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "exec_cmd.h"
  12 #include "remote.h"
  13
  14 #include <expat.h>
  15
  16 static const char http_push_usage[] =
  17 "git-http-push [--all] [--force] [--verbose] <remote> [<head>...]\n";
  18
  19 #ifndef XML_STATUS_OK
  20 enum XML_Status {
  21   XML_STATUS_OK = 1,
  22   XML_STATUS_ERROR = 0
  23 };
  24 #define XML_STATUS_OK    1
  25 #define XML_STATUS_ERROR 0
  26 #endif
  27
  28 #define PREV_BUF_SIZE 4096
  29 #define RANGE_HEADER_SIZE 30
  30
  31 /* DAV methods */
  32 #define DAV_LOCK "LOCK"
  33 #define DAV_MKCOL "MKCOL"
  34 #define DAV_MOVE "MOVE"
  35 #define DAV_PROPFIND "PROPFIND"
  36 #define DAV_PUT "PUT"
  37 #define DAV_UNLOCK "UNLOCK"
  38 #define DAV_DELETE "DELETE"
  39
  40 /* DAV lock flags */
  41 #define DAV_PROP_LOCKWR (1u << 0)
  42 #define DAV_PROP_LOCKEX (1u << 1)
  43 #define DAV_LOCK_OK (1u << 2)
  44
  45 /* DAV XML properties */
  46 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  47 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  48 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  49 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  50 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  51 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  52 #define DAV_PROPFIND_RESP ".multistatus.response"
  53 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  54 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  55
  56 /* DAV request body templates */
  57 #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>"
  58 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  59 #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>"
  60
  61 #define LOCK_TIME 600
  62 #define LOCK_REFRESH 30
  63
  64 /* bits #0-15 in revision.h */
  65
  66 #define LOCAL    (1u<<16)
  67 #define REMOTE   (1u<<17)
  68 #define FETCHING (1u<<18)
  69 #define PUSHING  (1u<<19)
  70
  71 /* We allow "recursive" symbolic refs. Only within reason, though */
  72 #define MAXDEPTH 5
  73
  74 static int pushing;
  75 static int aborted;
  76 static signed char remote_dir_exists[256];
  77
  78 static struct curl_slist *no_pragma_header;
  79 static struct curl_slist *default_headers;
  80
  81 static int push_verbosely;
  82 static int push_all;
  83 static int force_all;
  84
  85 static struct object_list *objects;
  86
  87 struct repo
  88 {
  89         char *url;
  90         int path_len;
  91         int has_info_refs;
  92         int can_update_info_refs;
  93         int has_info_packs;
  94         struct packed_git *packs;
  95         struct remote_lock *locks;
  96 };
  97
  98 static struct repo *remote;
  99
 100 enum transfer_state {
 101         NEED_FETCH,
 102         RUN_FETCH_LOOSE,
 103         RUN_FETCH_PACKED,
 104         NEED_PUSH,
 105         RUN_MKCOL,
 106         RUN_PUT,
 107         RUN_MOVE,
 108         ABORTED,
 109         COMPLETE,
 110 };
 111
 112 struct transfer_request
 113 {
 114         struct object *obj;
 115         char *url;
 116         char *dest;
 117         struct remote_lock *lock;
 118         struct curl_slist *headers;
 119         struct buffer buffer;
 120         char filename[PATH_MAX];
 121         char tmpfile[PATH_MAX];
 122         int local_fileno;
 123         FILE *local_stream;
 124         enum transfer_state state;
 125         CURLcode curl_result;
 126         char errorstr[CURL_ERROR_SIZE];
 127         long http_code;
 128         unsigned char real_sha1[20];
 129         SHA_CTX c;
 130         z_stream stream;
 131         int zret;
 132         int rename;
 133         void *userData;
 134         struct active_request_slot *slot;
 135         struct transfer_request *next;
 136 };
 137
 138 static struct transfer_request *request_queue_head;
 139
 140 struct xml_ctx
 141 {
 142         char *name;
 143         int len;
 144         char *cdata;
 145         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 146         void *userData;
 147 };
 148
 149 struct remote_lock
 150 {
 151         char *url;
 152         char *owner;
 153         char *token;
 154         time_t start_time;
 155         long timeout;
 156         int refreshing;
 157         struct remote_lock *next;
 158 };
 159
 160 /* Flags that control remote_ls processing */
 161 #define PROCESS_FILES (1u << 0)
 162 #define PROCESS_DIRS  (1u << 1)
 163 #define RECURSIVE     (1u << 2)
 164
 165 /* Flags that remote_ls passes to callback functions */
 166 #define IS_DIR (1u << 0)
 167
 168 struct remote_ls_ctx
 169 {
 170         char *path;
 171         void (*userFunc)(struct remote_ls_ctx *ls);
 172         void *userData;
 173         int flags;
 174         char *dentry_name;
 175         int dentry_flags;
 176         struct remote_ls_ctx *parent;
 177 };
 178
 179 static void finish_request(struct transfer_request *request);
 180 static void release_request(struct transfer_request *request);
 181
 182 static void process_response(void *callback_data)
 183 {
 184         struct transfer_request *request =
 185                 (struct transfer_request *)callback_data;
 186
 187         finish_request(request);
 188 }
 189
 190 #ifdef USE_CURL_MULTI
 191 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 192                                void *data)
 193 {
 194         unsigned char expn[4096];
 195         size_t size = eltsize * nmemb;
 196         int posn = 0;
 197         struct transfer_request *request = (struct transfer_request *)data;
 198         do {
 199                 ssize_t retval = xwrite(request->local_fileno,
 200                                        (char *) ptr + posn, size - posn);
 201                 if (retval < 0)
 202                         return posn;
 203                 posn += retval;
 204         } while (posn < size);
 205
 206         request->stream.avail_in = size;
 207         request->stream.next_in = ptr;
 208         do {
 209                 request->stream.next_out = expn;
 210                 request->stream.avail_out = sizeof(expn);
 211                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 212                 SHA1_Update(&request->c, expn,
 213                             sizeof(expn) - request->stream.avail_out);
 214         } while (request->stream.avail_in && request->zret == Z_OK);
 215         data_received++;
 216         return size;
 217 }
 218
 219 static void start_fetch_loose(struct transfer_request *request)
 220 {
 221         char *hex = sha1_to_hex(request->obj->sha1);
 222         char *filename;
 223         char prevfile[PATH_MAX];
 224         char *url;
 225         char *posn;
 226         int prevlocal;
 227         unsigned char prev_buf[PREV_BUF_SIZE];
 228         ssize_t prev_read = 0;
 229         long prev_posn = 0;
 230         char range[RANGE_HEADER_SIZE];
 231         struct curl_slist *range_header = NULL;
 232         struct active_request_slot *slot;
 233
 234         filename = sha1_file_name(request->obj->sha1);
 235         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 236         snprintf(request->tmpfile, sizeof(request->tmpfile),
 237                  "%s.temp", filename);
 238
 239         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 240         unlink(prevfile);
 241         rename(request->tmpfile, prevfile);
 242         unlink(request->tmpfile);
 243
 244         if (request->local_fileno != -1)
 245                 error("fd leakage in start: %d", request->local_fileno);
 246         request->local_fileno = open(request->tmpfile,
 247                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 248         /* This could have failed due to the "lazy directory creation";
 249          * try to mkdir the last path component.
 250          */
 251         if (request->local_fileno < 0 && errno == ENOENT) {
 252                 char *dir = strrchr(request->tmpfile, '/');
 253                 if (dir) {
 254                         *dir = 0;
 255                         mkdir(request->tmpfile, 0777);
 256                         *dir = '/';
 257                 }
 258                 request->local_fileno = open(request->tmpfile,
 259                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 260         }
 261
 262         if (request->local_fileno < 0) {
 263                 request->state = ABORTED;
 264                 error("Couldn't create temporary file %s for %s: %s",
 265                       request->tmpfile, request->filename, strerror(errno));
 266                 return;
 267         }
 268
 269         memset(&request->stream, 0, sizeof(request->stream));
 270
 271         inflateInit(&request->stream);
 272
 273         SHA1_Init(&request->c);
 274
 275         url = xmalloc(strlen(remote->url) + 50);
 276         request->url = xmalloc(strlen(remote->url) + 50);
 277         strcpy(url, remote->url);
 278         posn = url + strlen(remote->url);
 279         strcpy(posn, "objects/");
 280         posn += 8;
 281         memcpy(posn, hex, 2);
 282         posn += 2;
 283         *(posn++) = '/';
 284         strcpy(posn, hex + 2);
 285         strcpy(request->url, url);
 286
 287         /* If a previous temp file is present, process what was already
 288            fetched. */
 289         prevlocal = open(prevfile, O_RDONLY);
 290         if (prevlocal != -1) {
 291                 do {
 292                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 293                         if (prev_read>0) {
 294                                 if (fwrite_sha1_file(prev_buf,
 295                                                      1,
 296                                                      prev_read,
 297                                                      request) == prev_read) {
 298                                         prev_posn += prev_read;
 299                                 } else {
 300                                         prev_read = -1;
 301                                 }
 302                         }
 303                 } while (prev_read > 0);
 304                 close(prevlocal);
 305         }
 306         unlink(prevfile);
 307
 308         /* Reset inflate/SHA1 if there was an error reading the previous temp
 309            file; also rewind to the beginning of the local file. */
 310         if (prev_read == -1) {
 311                 memset(&request->stream, 0, sizeof(request->stream));
 312                 inflateInit(&request->stream);
 313                 SHA1_Init(&request->c);
 314                 if (prev_posn>0) {
 315                         prev_posn = 0;
 316                         lseek(request->local_fileno, 0, SEEK_SET);
 317                         ftruncate(request->local_fileno, 0);
 318                 }
 319         }
 320
 321         slot = get_active_slot();
 322         slot->callback_func = process_response;
 323         slot->callback_data = request;
 324         request->slot = slot;
 325
 326         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 327         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 328         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 329         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 330         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 331
 332         /* If we have successfully processed data from a previous fetch
 333            attempt, only fetch the data we don't already have. */
 334         if (prev_posn>0) {
 335                 if (push_verbosely)
 336                         fprintf(stderr,
 337                                 "Resuming fetch of object %s at byte %ld\n",
 338                                 hex, prev_posn);
 339                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 340                 range_header = curl_slist_append(range_header, range);
 341                 curl_easy_setopt(slot->curl,
 342                                  CURLOPT_HTTPHEADER, range_header);
 343         }
 344
 345         /* Try to get the request started, abort the request on error */
 346         request->state = RUN_FETCH_LOOSE;
 347         if (!start_active_slot(slot)) {
 348                 fprintf(stderr, "Unable to start GET request\n");
 349                 remote->can_update_info_refs = 0;
 350                 release_request(request);
 351         }
 352 }
 353
 354 static void start_mkcol(struct transfer_request *request)
 355 {
 356         char *hex = sha1_to_hex(request->obj->sha1);
 357         struct active_request_slot *slot;
 358         char *posn;
 359
 360         request->url = xmalloc(strlen(remote->url) + 13);
 361         strcpy(request->url, remote->url);
 362         posn = request->url + strlen(remote->url);
 363         strcpy(posn, "objects/");
 364         posn += 8;
 365         memcpy(posn, hex, 2);
 366         posn += 2;
 367         strcpy(posn, "/");
 368
 369         slot = get_active_slot();
 370         slot->callback_func = process_response;
 371         slot->callback_data = request;
 372         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 373         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 374         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 375         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 376         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 377
 378         if (start_active_slot(slot)) {
 379                 request->slot = slot;
 380                 request->state = RUN_MKCOL;
 381         } else {
 382                 request->state = ABORTED;
 383                 free(request->url);
 384                 request->url = NULL;
 385         }
 386 }
 387 #endif
 388
 389 static void start_fetch_packed(struct transfer_request *request)
 390 {
 391         char *url;
 392         struct packed_git *target;
 393         FILE *packfile;
 394         char *filename;
 395         long prev_posn = 0;
 396         char range[RANGE_HEADER_SIZE];
 397         struct curl_slist *range_header = NULL;
 398
 399         struct transfer_request *check_request = request_queue_head;
 400         struct active_request_slot *slot;
 401
 402         target = find_sha1_pack(request->obj->sha1, remote->packs);
 403         if (!target) {
 404                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 405                 remote->can_update_info_refs = 0;
 406                 release_request(request);
 407                 return;
 408         }
 409
 410         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 411         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 412
 413         filename = sha1_pack_name(target->sha1);
 414         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 415         snprintf(request->tmpfile, sizeof(request->tmpfile),
 416                  "%s.temp", filename);
 417
 418         url = xmalloc(strlen(remote->url) + 64);
 419         sprintf(url, "%sobjects/pack/pack-%s.pack",
 420                 remote->url, sha1_to_hex(target->sha1));
 421
 422         /* Make sure there isn't another open request for this pack */
 423         while (check_request) {
 424                 if (check_request->state == RUN_FETCH_PACKED &&
 425                     !strcmp(check_request->url, url)) {
 426                         free(url);
 427                         release_request(request);
 428                         return;
 429                 }
 430                 check_request = check_request->next;
 431         }
 432
 433         packfile = fopen(request->tmpfile, "a");
 434         if (!packfile) {
 435                 fprintf(stderr, "Unable to open local file %s for pack",
 436                         filename);
 437                 remote->can_update_info_refs = 0;
 438                 free(url);
 439                 return;
 440         }
 441
 442         slot = get_active_slot();
 443         slot->callback_func = process_response;
 444         slot->callback_data = request;
 445         request->slot = slot;
 446         request->local_stream = packfile;
 447         request->userData = target;
 448
 449         request->url = url;
 450         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 451         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 452         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 453         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 454         slot->local = packfile;
 455
 456         /* If there is data present from a previous transfer attempt,
 457            resume where it left off */
 458         prev_posn = ftell(packfile);
 459         if (prev_posn>0) {
 460                 if (push_verbosely)
 461                         fprintf(stderr,
 462                                 "Resuming fetch of pack %s at byte %ld\n",
 463                                 sha1_to_hex(target->sha1), prev_posn);
 464                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 465                 range_header = curl_slist_append(range_header, range);
 466                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 467         }
 468
 469         /* Try to get the request started, abort the request on error */
 470         request->state = RUN_FETCH_PACKED;
 471         if (!start_active_slot(slot)) {
 472                 fprintf(stderr, "Unable to start GET request\n");
 473                 remote->can_update_info_refs = 0;
 474                 release_request(request);
 475         }
 476 }
 477
 478 static void start_put(struct transfer_request *request)
 479 {
 480         char *hex = sha1_to_hex(request->obj->sha1);
 481         struct active_request_slot *slot;
 482         char *posn;
 483         enum object_type type;
 484         char hdr[50];
 485         void *unpacked;
 486         unsigned long len;
 487         int hdrlen;
 488         ssize_t size;
 489         z_stream stream;
 490
 491         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 492         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 493
 494         /* Set it up */
 495         memset(&stream, 0, sizeof(stream));
 496         deflateInit(&stream, zlib_compression_level);
 497         size = deflateBound(&stream, len + hdrlen);
 498         request->buffer.buffer = xmalloc(size);
 499
 500         /* Compress it */
 501         stream.next_out = request->buffer.buffer;
 502         stream.avail_out = size;
 503
 504         /* First header.. */
 505         stream.next_in = (void *)hdr;
 506         stream.avail_in = hdrlen;
 507         while (deflate(&stream, 0) == Z_OK)
 508                 /* nothing */;
 509
 510         /* Then the data itself.. */
 511         stream.next_in = unpacked;
 512         stream.avail_in = len;
 513         while (deflate(&stream, Z_FINISH) == Z_OK)
 514                 /* nothing */;
 515         deflateEnd(&stream);
 516         free(unpacked);
 517
 518         request->buffer.size = stream.total_out;
 519         request->buffer.posn = 0;
 520
 521         request->url = xmalloc(strlen(remote->url) +
 522                                strlen(request->lock->token) + 51);
 523         strcpy(request->url, remote->url);
 524         posn = request->url + strlen(remote->url);
 525         strcpy(posn, "objects/");
 526         posn += 8;
 527         memcpy(posn, hex, 2);
 528         posn += 2;
 529         *(posn++) = '/';
 530         strcpy(posn, hex + 2);
 531         request->dest = xmalloc(strlen(request->url) + 14);
 532         sprintf(request->dest, "Destination: %s", request->url);
 533         posn += 38;
 534         *(posn++) = '_';
 535         strcpy(posn, request->lock->token);
 536
 537         slot = get_active_slot();
 538         slot->callback_func = process_response;
 539         slot->callback_data = request;
 540         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 541         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 542         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 543         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 544         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 545         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 546         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 547         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 548         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 549
 550         if (start_active_slot(slot)) {
 551                 request->slot = slot;
 552                 request->state = RUN_PUT;
 553         } else {
 554                 request->state = ABORTED;
 555                 free(request->url);
 556                 request->url = NULL;
 557         }
 558 }
 559
 560 static void start_move(struct transfer_request *request)
 561 {
 562         struct active_request_slot *slot;
 563         struct curl_slist *dav_headers = NULL;
 564
 565         slot = get_active_slot();
 566         slot->callback_func = process_response;
 567         slot->callback_data = request;
 568         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 569         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 570         dav_headers = curl_slist_append(dav_headers, request->dest);
 571         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 572         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 573         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 574         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 575
 576         if (start_active_slot(slot)) {
 577                 request->slot = slot;
 578                 request->state = RUN_MOVE;
 579         } else {
 580                 request->state = ABORTED;
 581                 free(request->url);
 582                 request->url = NULL;
 583         }
 584 }
 585
 586 static int refresh_lock(struct remote_lock *lock)
 587 {
 588         struct active_request_slot *slot;
 589         struct slot_results results;
 590         char *if_header;
 591         char timeout_header[25];
 592         struct curl_slist *dav_headers = NULL;
 593         int rc = 0;
 594
 595         lock->refreshing = 1;
 596
 597         if_header = xmalloc(strlen(lock->token) + 25);
 598         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 599         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 600         dav_headers = curl_slist_append(dav_headers, if_header);
 601         dav_headers = curl_slist_append(dav_headers, timeout_header);
 602
 603         slot = get_active_slot();
 604         slot->results = &results;
 605         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 606         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 607         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 608         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 609         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 610
 611         if (start_active_slot(slot)) {
 612                 run_active_slot(slot);
 613                 if (results.curl_result != CURLE_OK) {
 614                         fprintf(stderr, "LOCK HTTP error %ld\n",
 615                                 results.http_code);
 616                 } else {
 617                         lock->start_time = time(NULL);
 618                         rc = 1;
 619                 }
 620         }
 621
 622         lock->refreshing = 0;
 623         curl_slist_free_all(dav_headers);
 624         free(if_header);
 625
 626         return rc;
 627 }
 628
 629 static void check_locks(void)
 630 {
 631         struct remote_lock *lock = remote->locks;
 632         time_t current_time = time(NULL);
 633         int time_remaining;
 634
 635         while (lock) {
 636                 time_remaining = lock->start_time + lock->timeout -
 637                         current_time;
 638                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 639                         if (!refresh_lock(lock)) {
 640                                 fprintf(stderr,
 641                                         "Unable to refresh lock for %s\n",
 642                                         lock->url);
 643                                 aborted = 1;
 644                                 return;
 645                         }
 646                 }
 647                 lock = lock->next;
 648         }
 649 }
 650
 651 static void release_request(struct transfer_request *request)
 652 {
 653         struct transfer_request *entry = request_queue_head;
 654
 655         if (request == request_queue_head) {
 656                 request_queue_head = request->next;
 657         } else {
 658                 while (entry->next != NULL && entry->next != request)
 659                         entry = entry->next;
 660                 if (entry->next == request)
 661                         entry->next = entry->next->next;
 662         }
 663
 664         if (request->local_fileno != -1)
 665                 close(request->local_fileno);
 666         if (request->local_stream)
 667                 fclose(request->local_stream);
 668         if (request->url != NULL)
 669                 free(request->url);
 670         free(request);
 671 }
 672
 673 static void finish_request(struct transfer_request *request)
 674 {
 675         struct stat st;
 676         struct packed_git *target;
 677         struct packed_git **lst;
 678
 679         request->curl_result = request->slot->curl_result;
 680         request->http_code = request->slot->http_code;
 681         request->slot = NULL;
 682
 683         /* Keep locks active */
 684         check_locks();
 685
 686         if (request->headers != NULL)
 687                 curl_slist_free_all(request->headers);
 688
 689         /* URL is reused for MOVE after PUT */
 690         if (request->state != RUN_PUT) {
 691                 free(request->url);
 692                 request->url = NULL;
 693         }
 694
 695         if (request->state == RUN_MKCOL) {
 696                 if (request->curl_result == CURLE_OK ||
 697                     request->http_code == 405) {
 698                         remote_dir_exists[request->obj->sha1[0]] = 1;
 699                         start_put(request);
 700                 } else {
 701                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 702                                 sha1_to_hex(request->obj->sha1),
 703                                 request->curl_result, request->http_code);
 704                         request->state = ABORTED;
 705                         aborted = 1;
 706                 }
 707         } else if (request->state == RUN_PUT) {
 708                 if (request->curl_result == CURLE_OK) {
 709                         start_move(request);
 710                 } else {
 711                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 712                                 sha1_to_hex(request->obj->sha1),
 713                                 request->curl_result, request->http_code);
 714                         request->state = ABORTED;
 715                         aborted = 1;
 716                 }
 717         } else if (request->state == RUN_MOVE) {
 718                 if (request->curl_result == CURLE_OK) {
 719                         if (push_verbosely)
 720                                 fprintf(stderr, "    sent %s\n",
 721                                         sha1_to_hex(request->obj->sha1));
 722                         request->obj->flags |= REMOTE;
 723                         release_request(request);
 724                 } else {
 725                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 726                                 sha1_to_hex(request->obj->sha1),
 727                                 request->curl_result, request->http_code);
 728                         request->state = ABORTED;
 729                         aborted = 1;
 730                 }
 731         } else if (request->state == RUN_FETCH_LOOSE) {
 732                 fchmod(request->local_fileno, 0444);
 733                 close(request->local_fileno); request->local_fileno = -1;
 734
 735                 if (request->curl_result != CURLE_OK &&
 736                     request->http_code != 416) {
 737                         if (stat(request->tmpfile, &st) == 0) {
 738                                 if (st.st_size == 0)
 739                                         unlink(request->tmpfile);
 740                         }
 741                 } else {
 742                         if (request->http_code == 416)
 743                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 744
 745                         inflateEnd(&request->stream);
 746                         SHA1_Final(request->real_sha1, &request->c);
 747                         if (request->zret != Z_STREAM_END) {
 748                                 unlink(request->tmpfile);
 749                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 750                                 unlink(request->tmpfile);
 751                         } else {
 752                                 request->rename =
 753                                         move_temp_to_file(
 754                                                 request->tmpfile,
 755                                                 request->filename);
 756                                 if (request->rename == 0) {
 757                                         request->obj->flags |= (LOCAL | REMOTE);
 758                                 }
 759                         }
 760                 }
 761
 762                 /* Try fetching packed if necessary */
 763                 if (request->obj->flags & LOCAL)
 764                         release_request(request);
 765                 else
 766                         start_fetch_packed(request);
 767
 768         } else if (request->state == RUN_FETCH_PACKED) {
 769                 if (request->curl_result != CURLE_OK) {
 770                         fprintf(stderr, "Unable to get pack file %s\n%s",
 771                                 request->url, curl_errorstr);
 772                         remote->can_update_info_refs = 0;
 773                 } else {
 774                         off_t pack_size = ftell(request->local_stream);
 775
 776                         fclose(request->local_stream);
 777                         request->local_stream = NULL;
 778                         if (!move_temp_to_file(request->tmpfile,
 779                                                request->filename)) {
 780                                 target = (struct packed_git *)request->userData;
 781                                 target->pack_size = pack_size;
 782                                 lst = &remote->packs;
 783                                 while (*lst != target)
 784                                         lst = &((*lst)->next);
 785                                 *lst = (*lst)->next;
 786
 787                                 if (!verify_pack(target, 0))
 788                                         install_packed_git(target);
 789                                 else
 790                                         remote->can_update_info_refs = 0;
 791                         }
 792                 }
 793                 release_request(request);
 794         }
 795 }
 796
 797 #ifdef USE_CURL_MULTI
 798 void fill_active_slots(void)
 799 {
 800         struct transfer_request *request = request_queue_head;
 801         struct transfer_request *next;
 802         struct active_request_slot *slot = active_queue_head;
 803         int num_transfers;
 804
 805         if (aborted)
 806                 return;
 807
 808         while (active_requests < max_requests && request != NULL) {
 809                 next = request->next;
 810                 if (request->state == NEED_FETCH) {
 811                         start_fetch_loose(request);
 812                 } else if (pushing && request->state == NEED_PUSH) {
 813                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 814                                 start_put(request);
 815                         } else {
 816                                 start_mkcol(request);
 817                         }
 818                         curl_multi_perform(curlm, &num_transfers);
 819                 }
 820                 request = next;
 821         }
 822
 823         while (slot != NULL) {
 824                 if (!slot->in_use && slot->curl != NULL) {
 825                         curl_easy_cleanup(slot->curl);
 826                         slot->curl = NULL;
 827                 }
 828                 slot = slot->next;
 829         }
 830 }
 831 #endif
 832
 833 static void get_remote_object_list(unsigned char parent);
 834
 835 static void add_fetch_request(struct object *obj)
 836 {
 837         struct transfer_request *request;
 838
 839         check_locks();
 840
 841         /*
 842          * Don't fetch the object if it's known to exist locally
 843          * or is already in the request queue
 844          */
 845         if (remote_dir_exists[obj->sha1[0]] == -1)
 846                 get_remote_object_list(obj->sha1[0]);
 847         if (obj->flags & (LOCAL | FETCHING))
 848                 return;
 849
 850         obj->flags |= FETCHING;
 851         request = xmalloc(sizeof(*request));
 852         request->obj = obj;
 853         request->url = NULL;
 854         request->lock = NULL;
 855         request->headers = NULL;
 856         request->local_fileno = -1;
 857         request->local_stream = NULL;
 858         request->state = NEED_FETCH;
 859         request->next = request_queue_head;
 860         request_queue_head = request;
 861
 862 #ifdef USE_CURL_MULTI
 863         fill_active_slots();
 864         step_active_slots();
 865 #endif
 866 }
 867
 868 static int add_send_request(struct object *obj, struct remote_lock *lock)
 869 {
 870         struct transfer_request *request = request_queue_head;
 871         struct packed_git *target;
 872
 873         /* Keep locks active */
 874         check_locks();
 875
 876         /*
 877          * Don't push the object if it's known to exist on the remote
 878          * or is already in the request queue
 879          */
 880         if (remote_dir_exists[obj->sha1[0]] == -1)
 881                 get_remote_object_list(obj->sha1[0]);
 882         if (obj->flags & (REMOTE | PUSHING))
 883                 return 0;
 884         target = find_sha1_pack(obj->sha1, remote->packs);
 885         if (target) {
 886                 obj->flags |= REMOTE;
 887                 return 0;
 888         }
 889
 890         obj->flags |= PUSHING;
 891         request = xmalloc(sizeof(*request));
 892         request->obj = obj;
 893         request->url = NULL;
 894         request->lock = lock;
 895         request->headers = NULL;
 896         request->local_fileno = -1;
 897         request->local_stream = NULL;
 898         request->state = NEED_PUSH;
 899         request->next = request_queue_head;
 900         request_queue_head = request;
 901
 902 #ifdef USE_CURL_MULTI
 903         fill_active_slots();
 904         step_active_slots();
 905 #endif
 906
 907         return 1;
 908 }
 909
 910 static int fetch_index(unsigned char *sha1)
 911 {
 912         char *hex = sha1_to_hex(sha1);
 913         char *filename;
 914         char *url;
 915         char tmpfile[PATH_MAX];
 916         long prev_posn = 0;
 917         char range[RANGE_HEADER_SIZE];
 918         struct curl_slist *range_header = NULL;
 919
 920         FILE *indexfile;
 921         struct active_request_slot *slot;
 922         struct slot_results results;
 923
 924         /* Don't use the index if the pack isn't there */
 925         url = xmalloc(strlen(remote->url) + 64);
 926         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 927         slot = get_active_slot();
 928         slot->results = &results;
 929         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 930         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 931         if (start_active_slot(slot)) {
 932                 run_active_slot(slot);
 933                 if (results.curl_result != CURLE_OK) {
 934                         free(url);
 935                         return error("Unable to verify pack %s is available",
 936                                      hex);
 937                 }
 938         } else {
 939                 return error("Unable to start request");
 940         }
 941
 942         if (has_pack_index(sha1))
 943                 return 0;
 944
 945         if (push_verbosely)
 946                 fprintf(stderr, "Getting index for pack %s\n", hex);
 947
 948         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 949
 950         filename = sha1_pack_index_name(sha1);
 951         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 952         indexfile = fopen(tmpfile, "a");
 953         if (!indexfile)
 954                 return error("Unable to open local file %s for pack index",
 955                              filename);
 956
 957         slot = get_active_slot();
 958         slot->results = &results;
 959         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 960         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 961         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 962         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 963         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 964         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 965         slot->local = indexfile;
 966
 967         /* If there is data present from a previous transfer attempt,
 968            resume where it left off */
 969         prev_posn = ftell(indexfile);
 970         if (prev_posn>0) {
 971                 if (push_verbosely)
 972                         fprintf(stderr,
 973                                 "Resuming fetch of index for pack %s at byte %ld\n",
 974                                 hex, prev_posn);
 975                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 976                 range_header = curl_slist_append(range_header, range);
 977                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 978         }
 979
 980         if (start_active_slot(slot)) {
 981                 run_active_slot(slot);
 982                 if (results.curl_result != CURLE_OK) {
 983                         free(url);
 984                         fclose(indexfile);
 985                         return error("Unable to get pack index %s\n%s", url,
 986                                      curl_errorstr);
 987                 }
 988         } else {
 989                 free(url);
 990                 fclose(indexfile);
 991                 return error("Unable to start request");
 992         }
 993
 994         free(url);
 995         fclose(indexfile);
 996
 997         return move_temp_to_file(tmpfile, filename);
 998 }
 999
1000 static int setup_index(unsigned char *sha1)
1001 {
1002         struct packed_git *new_pack;
1003
1004         if (fetch_index(sha1))
1005                 return -1;
1006
1007         new_pack = parse_pack_index(sha1);
1008         new_pack->next = remote->packs;
1009         remote->packs = new_pack;
1010         return 0;
1011 }
1012
1013 static int fetch_indices(void)
1014 {
1015         unsigned char sha1[20];
1016         char *url;
1017         struct buffer buffer;
1018         char *data;
1019         int i = 0;
1020
1021         struct active_request_slot *slot;
1022         struct slot_results results;
1023
1024         data = xcalloc(1, 4096);
1025         buffer.size = 4096;
1026         buffer.posn = 0;
1027         buffer.buffer = data;
1028
1029         if (push_verbosely)
1030                 fprintf(stderr, "Getting pack list\n");
1031
1032         url = xmalloc(strlen(remote->url) + 20);
1033         sprintf(url, "%sobjects/info/packs", remote->url);
1034
1035         slot = get_active_slot();
1036         slot->results = &results;
1037         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1038         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1039         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1040         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1041         if (start_active_slot(slot)) {
1042                 run_active_slot(slot);
1043                 if (results.curl_result != CURLE_OK) {
1044                         free(buffer.buffer);
1045                         free(url);
1046                         if (results.http_code == 404)
1047                                 return 0;
1048                         else
1049                                 return error("%s", curl_errorstr);
1050                 }
1051         } else {
1052                 free(buffer.buffer);
1053                 free(url);
1054                 return error("Unable to start request");
1055         }
1056         free(url);
1057
1058         data = buffer.buffer;
1059         while (i < buffer.posn) {
1060                 switch (data[i]) {
1061                 case 'P':
1062                         i++;
1063                         if (i + 52 < buffer.posn &&
1064                             !prefixcmp(data + i, " pack-") &&
1065                             !prefixcmp(data + i + 46, ".pack\n")) {
1066                                 get_sha1_hex(data + i + 6, sha1);
1067                                 setup_index(sha1);
1068                                 i += 51;
1069                                 break;
1070                         }
1071                 default:
1072                         while (data[i] != '\n')
1073                                 i++;
1074                 }
1075                 i++;
1076         }
1077
1078         free(buffer.buffer);
1079         return 0;
1080 }
1081
1082 static inline int needs_quote(int ch)
1083 {
1084         if (((ch >= 'A') && (ch <= 'Z'))
1085                         || ((ch >= 'a') && (ch <= 'z'))
1086                         || ((ch >= '0') && (ch <= '9'))
1087                         || (ch == '/')
1088                         || (ch == '-')
1089                         || (ch == '.'))
1090                 return 0;
1091         return 1;
1092 }
1093
1094 static inline int hex(int v)
1095 {
1096         if (v < 10) return '0' + v;
1097         else return 'A' + v - 10;
1098 }
1099
1100 static char *quote_ref_url(const char *base, const char *ref)
1101 {
1102         const char *cp;
1103         char *dp, *qref;
1104         int len, baselen, ch;
1105
1106         baselen = strlen(base);
1107         len = baselen + 1;
1108         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1109                 if (needs_quote(ch))
1110                         len += 2; /* extra two hex plus replacement % */
1111         qref = xmalloc(len);
1112         memcpy(qref, base, baselen);
1113         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1114                 if (needs_quote(ch)) {
1115                         *dp++ = '%';
1116                         *dp++ = hex((ch >> 4) & 0xF);
1117                         *dp++ = hex(ch & 0xF);
1118                 }
1119                 else
1120                         *dp++ = ch;
1121         }
1122         *dp = 0;
1123
1124         return qref;
1125 }
1126
1127 int fetch_ref(char *ref, unsigned char *sha1)
1128 {
1129         char *url;
1130         char hex[42];
1131         struct buffer buffer;
1132         char *base = remote->url;
1133         struct active_request_slot *slot;
1134         struct slot_results results;
1135         buffer.size = 41;
1136         buffer.posn = 0;
1137         buffer.buffer = hex;
1138         hex[41] = '\0';
1139
1140         url = quote_ref_url(base, ref);
1141         slot = get_active_slot();
1142         slot->results = &results;
1143         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1144         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1145         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1146         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1147         if (start_active_slot(slot)) {
1148                 run_active_slot(slot);
1149                 if (results.curl_result != CURLE_OK)
1150                         return error("Couldn't get %s for %s\n%s",
1151                                      url, ref, curl_errorstr);
1152         } else {
1153                 return error("Unable to start request");
1154         }
1155
1156         hex[40] = '\0';
1157         get_sha1_hex(hex, sha1);
1158         return 0;
1159 }
1160
1161 static void one_remote_object(const char *hex)
1162 {
1163         unsigned char sha1[20];
1164         struct object *obj;
1165
1166         if (get_sha1_hex(hex, sha1) != 0)
1167                 return;
1168
1169         obj = lookup_object(sha1);
1170         if (!obj)
1171                 obj = parse_object(sha1);
1172
1173         /* Ignore remote objects that don't exist locally */
1174         if (!obj)
1175                 return;
1176
1177         obj->flags |= REMOTE;
1178         if (!object_list_contains(objects, obj))
1179                 object_list_insert(obj, &objects);
1180 }
1181
1182 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1183 {
1184         int *lock_flags = (int *)ctx->userData;
1185
1186         if (tag_closed) {
1187                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1188                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1189                             (*lock_flags & DAV_PROP_LOCKWR)) {
1190                                 *lock_flags |= DAV_LOCK_OK;
1191                         }
1192                         *lock_flags &= DAV_LOCK_OK;
1193                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1194                         *lock_flags |= DAV_PROP_LOCKWR;
1195                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1196                         *lock_flags |= DAV_PROP_LOCKEX;
1197                 }
1198         }
1199 }
1200
1201 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1202 {
1203         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1204
1205         if (tag_closed && ctx->cdata) {
1206                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1207                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1208                         strcpy(lock->owner, ctx->cdata);
1209                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1210                         if (!prefixcmp(ctx->cdata, "Second-"))
1211                                 lock->timeout =
1212                                         strtol(ctx->cdata + 7, NULL, 10);
1213                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1214                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1215                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1216                                 strcpy(lock->token, ctx->cdata + 16);
1217                         }
1218                 }
1219         }
1220 }
1221
1222 static void one_remote_ref(char *refname);
1223
1224 static void
1225 xml_start_tag(void *userData, const char *name, const char **atts)
1226 {
1227         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1228         const char *c = strchr(name, ':');
1229         int new_len;
1230
1231         if (c == NULL)
1232                 c = name;
1233         else
1234                 c++;
1235
1236         new_len = strlen(ctx->name) + strlen(c) + 2;
1237
1238         if (new_len > ctx->len) {
1239                 ctx->name = xrealloc(ctx->name, new_len);
1240                 ctx->len = new_len;
1241         }
1242         strcat(ctx->name, ".");
1243         strcat(ctx->name, c);
1244
1245         free(ctx->cdata);
1246         ctx->cdata = NULL;
1247
1248         ctx->userFunc(ctx, 0);
1249 }
1250
1251 static void
1252 xml_end_tag(void *userData, const char *name)
1253 {
1254         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1255         const char *c = strchr(name, ':');
1256         char *ep;
1257
1258         ctx->userFunc(ctx, 1);
1259
1260         if (c == NULL)
1261                 c = name;
1262         else
1263                 c++;
1264
1265         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1266         *ep = 0;
1267 }
1268
1269 static void
1270 xml_cdata(void *userData, const XML_Char *s, int len)
1271 {
1272         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1273         free(ctx->cdata);
1274         ctx->cdata = xmalloc(len + 1);
1275         /* NB: 's' is not null-terminated, can not use strlcpy here */
1276         memcpy(ctx->cdata, s, len);
1277         ctx->cdata[len] = '\0';
1278 }
1279
1280 static struct remote_lock *lock_remote(const char *path, long timeout)
1281 {
1282         struct active_request_slot *slot;
1283         struct slot_results results;
1284         struct buffer out_buffer;
1285         struct buffer in_buffer;
1286         char *out_data;
1287         char *in_data;
1288         char *url;
1289         char *ep;
1290         char timeout_header[25];
1291         struct remote_lock *lock = NULL;
1292         XML_Parser parser = XML_ParserCreate(NULL);
1293         enum XML_Status result;
1294         struct curl_slist *dav_headers = NULL;
1295         struct xml_ctx ctx;
1296
1297         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1298         sprintf(url, "%s%s", remote->url, path);
1299
1300         /* Make sure leading directories exist for the remote ref */
1301         ep = strchr(url + strlen(remote->url) + 1, '/');
1302         while (ep) {
1303                 *ep = 0;
1304                 slot = get_active_slot();
1305                 slot->results = &results;
1306                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1307                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1308                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1309                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1310                 if (start_active_slot(slot)) {
1311                         run_active_slot(slot);
1312                         if (results.curl_result != CURLE_OK &&
1313                             results.http_code != 405) {
1314                                 fprintf(stderr,
1315                                         "Unable to create branch path %s\n",
1316                                         url);
1317                                 free(url);
1318                                 return NULL;
1319                         }
1320                 } else {
1321                         fprintf(stderr, "Unable to start MKCOL request\n");
1322                         free(url);
1323                         return NULL;
1324                 }
1325                 *ep = '/';
1326                 ep = strchr(ep + 1, '/');
1327         }
1328
1329         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1330         out_data = xmalloc(out_buffer.size + 1);
1331         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1332         out_buffer.posn = 0;
1333         out_buffer.buffer = out_data;
1334
1335         in_buffer.size = 4096;
1336         in_data = xmalloc(in_buffer.size);
1337         in_buffer.posn = 0;
1338         in_buffer.buffer = in_data;
1339
1340         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1341         dav_headers = curl_slist_append(dav_headers, timeout_header);
1342         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1343
1344         slot = get_active_slot();
1345         slot->results = &results;
1346         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1347         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1348         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1349         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1350         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1351         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1352         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1353         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1354         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1355
1356         lock = xcalloc(1, sizeof(*lock));
1357         lock->timeout = -1;
1358
1359         if (start_active_slot(slot)) {
1360                 run_active_slot(slot);
1361                 if (results.curl_result == CURLE_OK) {
1362                         ctx.name = xcalloc(10, 1);
1363                         ctx.len = 0;
1364                         ctx.cdata = NULL;
1365                         ctx.userFunc = handle_new_lock_ctx;
1366                         ctx.userData = lock;
1367                         XML_SetUserData(parser, &ctx);
1368                         XML_SetElementHandler(parser, xml_start_tag,
1369                                               xml_end_tag);
1370                         XML_SetCharacterDataHandler(parser, xml_cdata);
1371                         result = XML_Parse(parser, in_buffer.buffer,
1372                                            in_buffer.posn, 1);
1373                         free(ctx.name);
1374                         if (result != XML_STATUS_OK) {
1375                                 fprintf(stderr, "XML error: %s\n",
1376                                         XML_ErrorString(
1377                                                 XML_GetErrorCode(parser)));
1378                                 lock->timeout = -1;
1379                         }
1380                 }
1381         } else {
1382                 fprintf(stderr, "Unable to start LOCK request\n");
1383         }
1384
1385         curl_slist_free_all(dav_headers);
1386         free(out_data);
1387         free(in_data);
1388
1389         if (lock->token == NULL || lock->timeout <= 0) {
1390                 if (lock->token != NULL)
1391                         free(lock->token);
1392                 if (lock->owner != NULL)
1393                         free(lock->owner);
1394                 free(url);
1395                 free(lock);
1396                 lock = NULL;
1397         } else {
1398                 lock->url = url;
1399                 lock->start_time = time(NULL);
1400                 lock->next = remote->locks;
1401                 remote->locks = lock;
1402         }
1403
1404         return lock;
1405 }
1406
1407 static int unlock_remote(struct remote_lock *lock)
1408 {
1409         struct active_request_slot *slot;
1410         struct slot_results results;
1411         struct remote_lock *prev = remote->locks;
1412         char *lock_token_header;
1413         struct curl_slist *dav_headers = NULL;
1414         int rc = 0;
1415
1416         lock_token_header = xmalloc(strlen(lock->token) + 31);
1417         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1418                 lock->token);
1419         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1420
1421         slot = get_active_slot();
1422         slot->results = &results;
1423         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1424         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1425         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1426         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1427
1428         if (start_active_slot(slot)) {
1429                 run_active_slot(slot);
1430                 if (results.curl_result == CURLE_OK)
1431                         rc = 1;
1432                 else
1433                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1434                                 results.http_code);
1435         } else {
1436                 fprintf(stderr, "Unable to start UNLOCK request\n");
1437         }
1438
1439         curl_slist_free_all(dav_headers);
1440         free(lock_token_header);
1441
1442         if (remote->locks == lock) {
1443                 remote->locks = lock->next;
1444         } else {
1445                 while (prev && prev->next != lock)
1446                         prev = prev->next;
1447                 if (prev)
1448                         prev->next = prev->next->next;
1449         }
1450
1451         if (lock->owner != NULL)
1452                 free(lock->owner);
1453         free(lock->url);
1454         free(lock->token);
1455         free(lock);
1456
1457         return rc;
1458 }
1459
1460 static void remote_ls(const char *path, int flags,
1461                       void (*userFunc)(struct remote_ls_ctx *ls),
1462                       void *userData);
1463
1464 static void process_ls_object(struct remote_ls_ctx *ls)
1465 {
1466         unsigned int *parent = (unsigned int *)ls->userData;
1467         char *path = ls->dentry_name;
1468         char *obj_hex;
1469
1470         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1471                 remote_dir_exists[*parent] = 1;
1472                 return;
1473         }
1474
1475         if (strlen(path) != 49)
1476                 return;
1477         path += 8;
1478         obj_hex = xmalloc(strlen(path));
1479         /* NB: path is not null-terminated, can not use strlcpy here */
1480         memcpy(obj_hex, path, 2);
1481         strcpy(obj_hex + 2, path + 3);
1482         one_remote_object(obj_hex);
1483         free(obj_hex);
1484 }
1485
1486 static void process_ls_ref(struct remote_ls_ctx *ls)
1487 {
1488         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1489                 fprintf(stderr, "  %s\n", ls->dentry_name);
1490                 return;
1491         }
1492
1493         if (!(ls->dentry_flags & IS_DIR))
1494                 one_remote_ref(ls->dentry_name);
1495 }
1496
1497 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1498 {
1499         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1500
1501         if (tag_closed) {
1502                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1503                         if (ls->dentry_flags & IS_DIR) {
1504                                 if (ls->flags & PROCESS_DIRS) {
1505                                         ls->userFunc(ls);
1506                                 }
1507                                 if (strcmp(ls->dentry_name, ls->path) &&
1508                                     ls->flags & RECURSIVE) {
1509                                         remote_ls(ls->dentry_name,
1510                                                   ls->flags,
1511                                                   ls->userFunc,
1512                                                   ls->userData);
1513                                 }
1514                         } else if (ls->flags & PROCESS_FILES) {
1515                                 ls->userFunc(ls);
1516                         }
1517                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1518                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1519                                                   remote->path_len + 1);
1520                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1521                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1522                         ls->dentry_flags |= IS_DIR;
1523                 }
1524         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1525                 free(ls->dentry_name);
1526                 ls->dentry_name = NULL;
1527                 ls->dentry_flags = 0;
1528         }
1529 }
1530
1531 static void remote_ls(const char *path, int flags,
1532                       void (*userFunc)(struct remote_ls_ctx *ls),
1533                       void *userData)
1534 {
1535         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1536         struct active_request_slot *slot;
1537         struct slot_results results;
1538         struct buffer in_buffer;
1539         struct buffer out_buffer;
1540         char *in_data;
1541         char *out_data;
1542         XML_Parser parser = XML_ParserCreate(NULL);
1543         enum XML_Status result;
1544         struct curl_slist *dav_headers = NULL;
1545         struct xml_ctx ctx;
1546         struct remote_ls_ctx ls;
1547
1548         ls.flags = flags;
1549         ls.path = xstrdup(path);
1550         ls.dentry_name = NULL;
1551         ls.dentry_flags = 0;
1552         ls.userData = userData;
1553         ls.userFunc = userFunc;
1554
1555         sprintf(url, "%s%s", remote->url, path);
1556
1557         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1558         out_data = xmalloc(out_buffer.size + 1);
1559         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1560         out_buffer.posn = 0;
1561         out_buffer.buffer = out_data;
1562
1563         in_buffer.size = 4096;
1564         in_data = xmalloc(in_buffer.size);
1565         in_buffer.posn = 0;
1566         in_buffer.buffer = in_data;
1567
1568         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1569         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1570
1571         slot = get_active_slot();
1572         slot->results = &results;
1573         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1574         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1575         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1576         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1577         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1578         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1579         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1580         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1581         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1582
1583         if (start_active_slot(slot)) {
1584                 run_active_slot(slot);
1585                 if (results.curl_result == CURLE_OK) {
1586                         ctx.name = xcalloc(10, 1);
1587                         ctx.len = 0;
1588                         ctx.cdata = NULL;
1589                         ctx.userFunc = handle_remote_ls_ctx;
1590                         ctx.userData = &ls;
1591                         XML_SetUserData(parser, &ctx);
1592                         XML_SetElementHandler(parser, xml_start_tag,
1593                                               xml_end_tag);
1594                         XML_SetCharacterDataHandler(parser, xml_cdata);
1595                         result = XML_Parse(parser, in_buffer.buffer,
1596                                            in_buffer.posn, 1);
1597                         free(ctx.name);
1598
1599                         if (result != XML_STATUS_OK) {
1600                                 fprintf(stderr, "XML error: %s\n",
1601                                         XML_ErrorString(
1602                                                 XML_GetErrorCode(parser)));
1603                         }
1604                 }
1605         } else {
1606                 fprintf(stderr, "Unable to start PROPFIND request\n");
1607         }
1608
1609         free(ls.path);
1610         free(url);
1611         free(out_data);
1612         free(in_buffer.buffer);
1613         curl_slist_free_all(dav_headers);
1614 }
1615
1616 static void get_remote_object_list(unsigned char parent)
1617 {
1618         char path[] = "objects/XX/";
1619         static const char hex[] = "0123456789abcdef";
1620         unsigned int val = parent;
1621
1622         path[8] = hex[val >> 4];
1623         path[9] = hex[val & 0xf];
1624         remote_dir_exists[val] = 0;
1625         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1626                   process_ls_object, &val);
1627 }
1628
1629 static int locking_available(void)
1630 {
1631         struct active_request_slot *slot;
1632         struct slot_results results;
1633         struct buffer in_buffer;
1634         struct buffer out_buffer;
1635         char *in_data;
1636         char *out_data;
1637         XML_Parser parser = XML_ParserCreate(NULL);
1638         enum XML_Status result;
1639         struct curl_slist *dav_headers = NULL;
1640         struct xml_ctx ctx;
1641         int lock_flags = 0;
1642
1643         out_buffer.size =
1644                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1645                 strlen(remote->url) - 2;
1646         out_data = xmalloc(out_buffer.size + 1);
1647         snprintf(out_data, out_buffer.size + 1,
1648                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1649         out_buffer.posn = 0;
1650         out_buffer.buffer = out_data;
1651
1652         in_buffer.size = 4096;
1653         in_data = xmalloc(in_buffer.size);
1654         in_buffer.posn = 0;
1655         in_buffer.buffer = in_data;
1656
1657         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1658         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1659
1660         slot = get_active_slot();
1661         slot->results = &results;
1662         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1663         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1664         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1665         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1666         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1667         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1668         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1669         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1670         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1671
1672         if (start_active_slot(slot)) {
1673                 run_active_slot(slot);
1674                 if (results.curl_result == CURLE_OK) {
1675                         ctx.name = xcalloc(10, 1);
1676                         ctx.len = 0;
1677                         ctx.cdata = NULL;
1678                         ctx.userFunc = handle_lockprop_ctx;
1679                         ctx.userData = &lock_flags;
1680                         XML_SetUserData(parser, &ctx);
1681                         XML_SetElementHandler(parser, xml_start_tag,
1682                                               xml_end_tag);
1683                         result = XML_Parse(parser, in_buffer.buffer,
1684                                            in_buffer.posn, 1);
1685                         free(ctx.name);
1686
1687                         if (result != XML_STATUS_OK) {
1688                                 fprintf(stderr, "XML error: %s\n",
1689                                         XML_ErrorString(
1690                                                 XML_GetErrorCode(parser)));
1691                                 lock_flags = 0;
1692                         }
1693                 }
1694         } else {
1695                 fprintf(stderr, "Unable to start PROPFIND request\n");
1696         }
1697
1698         free(out_data);
1699         free(in_buffer.buffer);
1700         curl_slist_free_all(dav_headers);
1701
1702         return lock_flags;
1703 }
1704
1705 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1706 {
1707         struct object_list *entry = xmalloc(sizeof(struct object_list));
1708         entry->item = obj;
1709         entry->next = *p;
1710         *p = entry;
1711         return &entry->next;
1712 }
1713
1714 static struct object_list **process_blob(struct blob *blob,
1715                                          struct object_list **p,
1716                                          struct name_path *path,
1717                                          const char *name)
1718 {
1719         struct object *obj = &blob->object;
1720
1721         obj->flags |= LOCAL;
1722
1723         if (obj->flags & (UNINTERESTING | SEEN))
1724                 return p;
1725
1726         obj->flags |= SEEN;
1727         return add_one_object(obj, p);
1728 }
1729
1730 static struct object_list **process_tree(struct tree *tree,
1731                                          struct object_list **p,
1732                                          struct name_path *path,
1733                                          const char *name)
1734 {
1735         struct object *obj = &tree->object;
1736         struct tree_desc desc;
1737         struct name_entry entry;
1738         struct name_path me;
1739
1740         obj->flags |= LOCAL;
1741
1742         if (obj->flags & (UNINTERESTING | SEEN))
1743                 return p;
1744         if (parse_tree(tree) < 0)
1745                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1746
1747         obj->flags |= SEEN;
1748         name = xstrdup(name);
1749         p = add_one_object(obj, p);
1750         me.up = path;
1751         me.elem = name;
1752         me.elem_len = strlen(name);
1753
1754         init_tree_desc(&desc, tree->buffer, tree->size);
1755
1756         while (tree_entry(&desc, &entry)) {
1757                 if (S_ISDIR(entry.mode))
1758                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1759                 else
1760                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1761         }
1762         free(tree->buffer);
1763         tree->buffer = NULL;
1764         return p;
1765 }
1766
1767 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1768 {
1769         int i;
1770         struct commit *commit;
1771         struct object_list **p = &objects;
1772         int count = 0;
1773
1774         while ((commit = get_revision(revs)) != NULL) {
1775                 p = process_tree(commit->tree, p, NULL, "");
1776                 commit->object.flags |= LOCAL;
1777                 if (!(commit->object.flags & UNINTERESTING))
1778                         count += add_send_request(&commit->object, lock);
1779         }
1780
1781         for (i = 0; i < revs->pending.nr; i++) {
1782                 struct object_array_entry *entry = revs->pending.objects + i;
1783                 struct object *obj = entry->item;
1784                 const char *name = entry->name;
1785
1786                 if (obj->flags & (UNINTERESTING | SEEN))
1787                         continue;
1788                 if (obj->type == OBJ_TAG) {
1789                         obj->flags |= SEEN;
1790                         p = add_one_object(obj, p);
1791                         continue;
1792                 }
1793                 if (obj->type == OBJ_TREE) {
1794                         p = process_tree((struct tree *)obj, p, NULL, name);
1795                         continue;
1796                 }
1797                 if (obj->type == OBJ_BLOB) {
1798                         p = process_blob((struct blob *)obj, p, NULL, name);
1799                         continue;
1800                 }
1801                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1802         }
1803
1804         while (objects) {
1805                 if (!(objects->item->flags & UNINTERESTING))
1806                         count += add_send_request(objects->item, lock);
1807                 objects = objects->next;
1808         }
1809
1810         return count;
1811 }
1812
1813 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1814 {
1815         struct active_request_slot *slot;
1816         struct slot_results results;
1817         char *out_data;
1818         char *if_header;
1819         struct buffer out_buffer;
1820         struct curl_slist *dav_headers = NULL;
1821         int i;
1822
1823         if_header = xmalloc(strlen(lock->token) + 25);
1824         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1825         dav_headers = curl_slist_append(dav_headers, if_header);
1826
1827         out_buffer.size = 41;
1828         out_data = xmalloc(out_buffer.size + 1);
1829         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1830         if (i != out_buffer.size) {
1831                 fprintf(stderr, "Unable to initialize PUT request body\n");
1832                 return 0;
1833         }
1834         out_buffer.posn = 0;
1835         out_buffer.buffer = out_data;
1836
1837         slot = get_active_slot();
1838         slot->results = &results;
1839         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1840         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1841         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1842         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1843         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1844         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1845         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1846         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1847         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1848
1849         if (start_active_slot(slot)) {
1850                 run_active_slot(slot);
1851                 free(out_data);
1852                 free(if_header);
1853                 if (results.curl_result != CURLE_OK) {
1854                         fprintf(stderr,
1855                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1856                                 results.curl_result, results.http_code);
1857                         /* We should attempt recovery? */
1858                         return 0;
1859                 }
1860         } else {
1861                 free(out_data);
1862                 free(if_header);
1863                 fprintf(stderr, "Unable to start PUT request\n");
1864                 return 0;
1865         }
1866
1867         return 1;
1868 }
1869
1870 static struct ref *local_refs, **local_tail;
1871 static struct ref *remote_refs, **remote_tail;
1872
1873 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1874 {
1875         struct ref *ref;
1876         int len = strlen(refname) + 1;
1877         ref = xcalloc(1, sizeof(*ref) + len);
1878         hashcpy(ref->new_sha1, sha1);
1879         memcpy(ref->name, refname, len);
1880         *local_tail = ref;
1881         local_tail = &ref->next;
1882         return 0;
1883 }
1884
1885 static void one_remote_ref(char *refname)
1886 {
1887         struct ref *ref;
1888         unsigned char remote_sha1[20];
1889         struct object *obj;
1890         int len = strlen(refname) + 1;
1891
1892         if (fetch_ref(refname, remote_sha1) != 0) {
1893                 fprintf(stderr,
1894                         "Unable to fetch ref %s from %s\n",
1895                         refname, remote->url);
1896                 return;
1897         }
1898
1899         /*
1900          * Fetch a copy of the object if it doesn't exist locally - it
1901          * may be required for updating server info later.
1902          */
1903         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1904                 obj = lookup_unknown_object(remote_sha1);
1905                 if (obj) {
1906                         fprintf(stderr, "  fetch %s for %s\n",
1907                                 sha1_to_hex(remote_sha1), refname);
1908                         add_fetch_request(obj);
1909                 }
1910         }
1911
1912         ref = xcalloc(1, sizeof(*ref) + len);
1913         hashcpy(ref->old_sha1, remote_sha1);
1914         memcpy(ref->name, refname, len);
1915         *remote_tail = ref;
1916         remote_tail = &ref->next;
1917 }
1918
1919 static void get_local_heads(void)
1920 {
1921         local_tail = &local_refs;
1922         for_each_ref(one_local_ref, NULL);
1923 }
1924
1925 static void get_dav_remote_heads(void)
1926 {
1927         remote_tail = &remote_refs;
1928         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1929 }
1930
1931 static int is_zero_sha1(const unsigned char *sha1)
1932 {
1933         int i;
1934
1935         for (i = 0; i < 20; i++) {
1936                 if (*sha1++)
1937                         return 0;
1938         }
1939         return 1;
1940 }
1941
1942 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1943 {
1944         while (list) {
1945                 struct commit_list *temp = list;
1946                 temp->item->object.flags &= ~mark;
1947                 list = temp->next;
1948                 free(temp);
1949         }
1950 }
1951
1952 static int ref_newer(const unsigned char *new_sha1,
1953                      const unsigned char *old_sha1)
1954 {
1955         struct object *o;
1956         struct commit *old, *new;
1957         struct commit_list *list, *used;
1958         int found = 0;
1959
1960         /* Both new and old must be commit-ish and new is descendant of
1961          * old.  Otherwise we require --force.
1962          */
1963         o = deref_tag(parse_object(old_sha1), NULL, 0);
1964         if (!o || o->type != OBJ_COMMIT)
1965                 return 0;
1966         old = (struct commit *) o;
1967
1968         o = deref_tag(parse_object(new_sha1), NULL, 0);
1969         if (!o || o->type != OBJ_COMMIT)
1970                 return 0;
1971         new = (struct commit *) o;
1972
1973         if (parse_commit(new) < 0)
1974                 return 0;
1975
1976         used = list = NULL;
1977         commit_list_insert(new, &list);
1978         while (list) {
1979                 new = pop_most_recent_commit(&list, TMP_MARK);
1980                 commit_list_insert(new, &used);
1981                 if (new == old) {
1982                         found = 1;
1983                         break;
1984                 }
1985         }
1986         unmark_and_free(list, TMP_MARK);
1987         unmark_and_free(used, TMP_MARK);
1988         return found;
1989 }
1990
1991 static void mark_edge_parents_uninteresting(struct commit *commit)
1992 {
1993         struct commit_list *parents;
1994
1995         for (parents = commit->parents; parents; parents = parents->next) {
1996                 struct commit *parent = parents->item;
1997                 if (!(parent->object.flags & UNINTERESTING))
1998                         continue;
1999                 mark_tree_uninteresting(parent->tree);
2000         }
2001 }
2002
2003 static void mark_edges_uninteresting(struct commit_list *list)
2004 {
2005         for ( ; list; list = list->next) {
2006                 struct commit *commit = list->item;
2007
2008                 if (commit->object.flags & UNINTERESTING) {
2009                         mark_tree_uninteresting(commit->tree);
2010                         continue;
2011                 }
2012                 mark_edge_parents_uninteresting(commit);
2013         }
2014 }
2015
2016 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2017 {
2018         struct buffer *buf = (struct buffer *)ls->userData;
2019         unsigned char remote_sha1[20];
2020         struct object *o;
2021         int len;
2022         char *ref_info;
2023
2024         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2025                 fprintf(stderr,
2026                         "Unable to fetch ref %s from %s\n",
2027                         ls->dentry_name, remote->url);
2028                 aborted = 1;
2029                 return;
2030         }
2031
2032         o = parse_object(remote_sha1);
2033         if (!o) {
2034                 fprintf(stderr,
2035                         "Unable to parse object %s for remote ref %s\n",
2036                         sha1_to_hex(remote_sha1), ls->dentry_name);
2037                 aborted = 1;
2038                 return;
2039         }
2040
2041         len = strlen(ls->dentry_name) + 42;
2042         ref_info = xcalloc(len + 1, 1);
2043         sprintf(ref_info, "%s   %s\n",
2044                 sha1_to_hex(remote_sha1), ls->dentry_name);
2045         fwrite_buffer(ref_info, 1, len, buf);
2046         free(ref_info);
2047
2048         if (o->type == OBJ_TAG) {
2049                 o = deref_tag(o, ls->dentry_name, 0);
2050                 if (o) {
2051                         len = strlen(ls->dentry_name) + 45;
2052                         ref_info = xcalloc(len + 1, 1);
2053                         sprintf(ref_info, "%s   %s^{}\n",
2054                                 sha1_to_hex(o->sha1), ls->dentry_name);
2055                         fwrite_buffer(ref_info, 1, len, buf);
2056                         free(ref_info);
2057                 }
2058         }
2059 }
2060
2061 static void update_remote_info_refs(struct remote_lock *lock)
2062 {
2063         struct buffer buffer;
2064         struct active_request_slot *slot;
2065         struct slot_results results;
2066         char *if_header;
2067         struct curl_slist *dav_headers = NULL;
2068
2069         buffer.buffer = xcalloc(1, 4096);
2070         buffer.size = 4096;
2071         buffer.posn = 0;
2072         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2073                   add_remote_info_ref, &buffer);
2074         if (!aborted) {
2075                 if_header = xmalloc(strlen(lock->token) + 25);
2076                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2077                 dav_headers = curl_slist_append(dav_headers, if_header);
2078
2079                 slot = get_active_slot();
2080                 slot->results = &results;
2081                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2082                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2083                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2084                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2085                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2086                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2087                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2088                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2089                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2090
2091                 buffer.posn = 0;
2092
2093                 if (start_active_slot(slot)) {
2094                         run_active_slot(slot);
2095                         if (results.curl_result != CURLE_OK) {
2096                                 fprintf(stderr,
2097                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2098                                         results.curl_result, results.http_code);
2099                         }
2100                 }
2101                 free(if_header);
2102         }
2103         free(buffer.buffer);
2104 }
2105
2106 static int remote_exists(const char *path)
2107 {
2108         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2109         struct active_request_slot *slot;
2110         struct slot_results results;
2111
2112         sprintf(url, "%s%s", remote->url, path);
2113
2114         slot = get_active_slot();
2115         slot->results = &results;
2116         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2117         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2118
2119         if (start_active_slot(slot)) {
2120                 run_active_slot(slot);
2121                 if (results.http_code == 404)
2122                         return 0;
2123                 else if (results.curl_result == CURLE_OK)
2124                         return 1;
2125                 else
2126                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2127         } else {
2128                 fprintf(stderr, "Unable to start HEAD request\n");
2129         }
2130
2131         return -1;
2132 }
2133
2134 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2135 {
2136         char *url;
2137         struct buffer buffer;
2138         struct active_request_slot *slot;
2139         struct slot_results results;
2140
2141         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2142         sprintf(url, "%s%s", remote->url, path);
2143
2144         buffer.size = 4096;
2145         buffer.posn = 0;
2146         buffer.buffer = xmalloc(buffer.size);
2147
2148         slot = get_active_slot();
2149         slot->results = &results;
2150         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2151         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2152         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2153         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2154         if (start_active_slot(slot)) {
2155                 run_active_slot(slot);
2156                 if (results.curl_result != CURLE_OK) {
2157                         die("Couldn't get %s for remote symref\n%s",
2158                             url, curl_errorstr);
2159                 }
2160         } else {
2161                 die("Unable to start remote symref request");
2162         }
2163         free(url);
2164
2165         if (*symref != NULL)
2166                 free(*symref);
2167         *symref = NULL;
2168         hashclr(sha1);
2169
2170         if (buffer.posn == 0)
2171                 return;
2172
2173         /* If it's a symref, set the refname; otherwise try for a sha1 */
2174         if (!prefixcmp((char *)buffer.buffer, "ref: ")) {
2175                 *symref = xmalloc(buffer.posn - 5);
2176                 memcpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6);
2177                 (*symref)[buffer.posn - 6] = '\0';
2178         } else {
2179                 get_sha1_hex(buffer.buffer, sha1);
2180         }
2181
2182         free(buffer.buffer);
2183 }
2184
2185 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2186 {
2187         struct commit *head = lookup_commit(head_sha1);
2188         struct commit *branch = lookup_commit(branch_sha1);
2189         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2190
2191         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2192 }
2193
2194 static int delete_remote_branch(char *pattern, int force)
2195 {
2196         struct ref *refs = remote_refs;
2197         struct ref *remote_ref = NULL;
2198         unsigned char head_sha1[20];
2199         char *symref = NULL;
2200         int match;
2201         int patlen = strlen(pattern);
2202         int i;
2203         struct active_request_slot *slot;
2204         struct slot_results results;
2205         char *url;
2206
2207         /* Find the remote branch(es) matching the specified branch name */
2208         for (match = 0; refs; refs = refs->next) {
2209                 char *name = refs->name;
2210                 int namelen = strlen(name);
2211                 if (namelen < patlen ||
2212                     memcmp(name + namelen - patlen, pattern, patlen))
2213                         continue;
2214                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2215                         continue;
2216                 match++;
2217                 remote_ref = refs;
2218         }
2219         if (match == 0)
2220                 return error("No remote branch matches %s", pattern);
2221         if (match != 1)
2222                 return error("More than one remote branch matches %s",
2223                              pattern);
2224
2225         /*
2226          * Remote HEAD must be a symref (not exactly foolproof; a remote
2227          * symlink to a symref will look like a symref)
2228          */
2229         fetch_symref("HEAD", &symref, head_sha1);
2230         if (!symref)
2231                 return error("Remote HEAD is not a symref");
2232
2233         /* Remote branch must not be the remote HEAD */
2234         for (i=0; symref && i<MAXDEPTH; i++) {
2235                 if (!strcmp(remote_ref->name, symref))
2236                         return error("Remote branch %s is the current HEAD",
2237                                      remote_ref->name);
2238                 fetch_symref(symref, &symref, head_sha1);
2239         }
2240
2241         /* Run extra sanity checks if delete is not forced */
2242         if (!force) {
2243                 /* Remote HEAD must resolve to a known object */
2244                 if (symref)
2245                         return error("Remote HEAD symrefs too deep");
2246                 if (is_zero_sha1(head_sha1))
2247                         return error("Unable to resolve remote HEAD");
2248                 if (!has_sha1_file(head_sha1))
2249                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2250
2251                 /* Remote branch must resolve to a known object */
2252                 if (is_zero_sha1(remote_ref->old_sha1))
2253                         return error("Unable to resolve remote branch %s",
2254                                      remote_ref->name);
2255                 if (!has_sha1_file(remote_ref->old_sha1))
2256                         return error("Remote branch %s resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", remote_ref->name, sha1_to_hex(remote_ref->old_sha1));
2257
2258                 /* Remote branch must be an ancestor of remote HEAD */
2259                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2260                         return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern);
2261                 }
2262         }
2263
2264         /* Send delete request */
2265         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2266         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2267         sprintf(url, "%s%s", remote->url, remote_ref->name);
2268         slot = get_active_slot();
2269         slot->results = &results;
2270         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2271         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2272         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2273         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2274         if (start_active_slot(slot)) {
2275                 run_active_slot(slot);
2276                 free(url);
2277                 if (results.curl_result != CURLE_OK)
2278                         return error("DELETE request failed (%d/%ld)\n",
2279                                      results.curl_result, results.http_code);
2280         } else {
2281                 free(url);
2282                 return error("Unable to start DELETE request");
2283         }
2284
2285         return 0;
2286 }
2287
2288 int main(int argc, char **argv)
2289 {
2290         struct transfer_request *request;
2291         struct transfer_request *next_request;
2292         int nr_refspec = 0;
2293         char **refspec = NULL;
2294         struct remote_lock *ref_lock = NULL;
2295         struct remote_lock *info_ref_lock = NULL;
2296         struct rev_info revs;
2297         int delete_branch = 0;
2298         int force_delete = 0;
2299         int objects_to_send;
2300         int rc = 0;
2301         int i;
2302         int new_refs;
2303         struct ref *ref;
2304
2305         setup_git_directory();
2306
2307         remote = xcalloc(sizeof(*remote), 1);
2308
2309         argv++;
2310         for (i = 1; i < argc; i++, argv++) {
2311                 char *arg = *argv;
2312
2313                 if (*arg == '-') {
2314                         if (!strcmp(arg, "--all")) {
2315                                 push_all = 1;
2316                                 continue;
2317                         }
2318                         if (!strcmp(arg, "--force")) {
2319                                 force_all = 1;
2320                                 continue;
2321                         }
2322                         if (!strcmp(arg, "--verbose")) {
2323                                 push_verbosely = 1;
2324                                 continue;
2325                         }
2326                         if (!strcmp(arg, "-d")) {
2327                                 delete_branch = 1;
2328                                 continue;
2329                         }
2330                         if (!strcmp(arg, "-D")) {
2331                                 delete_branch = 1;
2332                                 force_delete = 1;
2333                                 continue;
2334                         }
2335                 }
2336                 if (!remote->url) {
2337                         char *path = strstr(arg, "//");
2338                         remote->url = arg;
2339                         if (path) {
2340                                 path = strchr(path+2, '/');
2341                                 if (path)
2342                                         remote->path_len = strlen(path);
2343                         }
2344                         continue;
2345                 }
2346                 refspec = argv;
2347                 nr_refspec = argc - i;
2348                 break;
2349         }
2350
2351         if (!remote->url)
2352                 usage(http_push_usage);
2353
2354         if (delete_branch && nr_refspec != 1)
2355                 die("You must specify only one branch name when deleting a remote branch");
2356
2357         memset(remote_dir_exists, -1, 256);
2358
2359         http_init();
2360
2361         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2362         default_headers = curl_slist_append(default_headers, "Range:");
2363         default_headers = curl_slist_append(default_headers, "Destination:");
2364         default_headers = curl_slist_append(default_headers, "If:");
2365         default_headers = curl_slist_append(default_headers,
2366                                             "Pragma: no-cache");
2367
2368         /* Verify DAV compliance/lock support */
2369         if (!locking_available()) {
2370                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2371                 rc = 1;
2372                 goto cleanup;
2373         }
2374
2375         /* Check whether the remote has server info files */
2376         remote->can_update_info_refs = 0;
2377         remote->has_info_refs = remote_exists("info/refs");
2378         remote->has_info_packs = remote_exists("objects/info/packs");
2379         if (remote->has_info_refs) {
2380                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2381                 if (info_ref_lock)
2382                         remote->can_update_info_refs = 1;
2383         }
2384         if (remote->has_info_packs)
2385                 fetch_indices();
2386
2387         /* Get a list of all local and remote heads to validate refspecs */
2388         get_local_heads();
2389         fprintf(stderr, "Fetching remote heads...\n");
2390         get_dav_remote_heads();
2391
2392         /* Remove a remote branch if -d or -D was specified */
2393         if (delete_branch) {
2394                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2395                         fprintf(stderr, "Unable to delete remote branch %s\n",
2396                                 refspec[0]);
2397                 goto cleanup;
2398         }
2399
2400         /* match them up */
2401         if (!remote_tail)
2402                 remote_tail = &remote_refs;
2403         if (match_refs(local_refs, remote_refs, &remote_tail,
2404                        nr_refspec, refspec, push_all))
2405                 return -1;
2406         if (!remote_refs) {
2407                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2408                 return 0;
2409         }
2410
2411         new_refs = 0;
2412         for (ref = remote_refs; ref; ref = ref->next) {
2413                 char old_hex[60], *new_hex;
2414                 const char *commit_argv[4];
2415                 int commit_argc;
2416                 char *new_sha1_hex, *old_sha1_hex;
2417
2418                 if (!ref->peer_ref)
2419                         continue;
2420                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2421                         if (push_verbosely || 1)
2422                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2423                         continue;
2424                 }
2425
2426                 if (!force_all &&
2427                     !is_zero_sha1(ref->old_sha1) &&
2428                     !ref->force) {
2429                         if (!has_sha1_file(ref->old_sha1) ||
2430                             !ref_newer(ref->peer_ref->new_sha1,
2431                                        ref->old_sha1)) {
2432                                 /* We do not have the remote ref, or
2433                                  * we know that the remote ref is not
2434                                  * an ancestor of what we are trying to
2435                                  * push.  Either way this can be losing
2436                                  * commits at the remote end and likely
2437                                  * we were not up to date to begin with.
2438                                  */
2439                                 error("remote '%s' is not a strict "
2440                                       "subset of local ref '%s'. "
2441                                       "maybe you are not up-to-date and "
2442                                       "need to pull first?",
2443                                       ref->name,
2444                                       ref->peer_ref->name);
2445                                 rc = -2;
2446                                 continue;
2447                         }
2448                 }
2449                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2450                 if (is_zero_sha1(ref->new_sha1)) {
2451                         error("cannot happen anymore");
2452                         rc = -3;
2453                         continue;
2454                 }
2455                 new_refs++;
2456                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2457                 new_hex = sha1_to_hex(ref->new_sha1);
2458
2459                 fprintf(stderr, "updating '%s'", ref->name);
2460                 if (strcmp(ref->name, ref->peer_ref->name))
2461                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2462                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2463
2464
2465                 /* Lock remote branch ref */
2466                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2467                 if (ref_lock == NULL) {
2468                         fprintf(stderr, "Unable to lock remote branch %s\n",
2469                                 ref->name);
2470                         rc = 1;
2471                         continue;
2472                 }
2473
2474                 /* Set up revision info for this refspec */
2475                 commit_argc = 3;
2476                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2477                 old_sha1_hex = NULL;
2478                 commit_argv[1] = "--objects";
2479                 commit_argv[2] = new_sha1_hex;
2480                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2481                         old_sha1_hex = xmalloc(42);
2482                         sprintf(old_sha1_hex, "^%s",
2483                                 sha1_to_hex(ref->old_sha1));
2484                         commit_argv[3] = old_sha1_hex;
2485                         commit_argc++;
2486                 }
2487                 init_revisions(&revs, setup_git_directory());
2488                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2489                 free(new_sha1_hex);
2490                 if (old_sha1_hex) {
2491                         free(old_sha1_hex);
2492                         commit_argv[1] = NULL;
2493                 }
2494
2495                 /* Generate a list of objects that need to be pushed */
2496                 pushing = 0;
2497                 prepare_revision_walk(&revs);
2498                 mark_edges_uninteresting(revs.commits);
2499                 objects_to_send = get_delta(&revs, ref_lock);
2500                 finish_all_active_slots();
2501
2502                 /* Push missing objects to remote, this would be a
2503                    convenient time to pack them first if appropriate. */
2504                 pushing = 1;
2505                 if (objects_to_send)
2506                         fprintf(stderr, "    sending %d objects\n",
2507                                 objects_to_send);
2508 #ifdef USE_CURL_MULTI
2509                 fill_active_slots();
2510 #endif
2511                 finish_all_active_slots();
2512
2513                 /* Update the remote branch if all went well */
2514                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2515                         rc = 1;
2516                         goto unlock;
2517                 }
2518
2519         unlock:
2520                 if (!rc)
2521                         fprintf(stderr, "    done\n");
2522                 unlock_remote(ref_lock);
2523                 check_locks();
2524         }
2525
2526         /* Update remote server info if appropriate */
2527         if (remote->has_info_refs && new_refs) {
2528                 if (info_ref_lock && remote->can_update_info_refs) {
2529                         fprintf(stderr, "Updating remote server info\n");
2530                         update_remote_info_refs(info_ref_lock);
2531                 } else {
2532                         fprintf(stderr, "Unable to update server info\n");
2533                 }
2534         }
2535         if (info_ref_lock)
2536                 unlock_remote(info_ref_lock);
2537
2538  cleanup:
2539         free(remote);
2540
2541         curl_slist_free_all(no_pragma_header);
2542         curl_slist_free_all(default_headers);
2543
2544         http_cleanup();
2545
2546         request = request_queue_head;
2547         while (request != NULL) {
2548                 next_request = request->next;
2549                 release_request(request);
2550                 request = next_request;
2551         }
2552
2553         return rc;
2554 }