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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14
  15 #include <expat.h>
  16
  17 static const char http_push_usage[] =
  18 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20 #ifndef XML_STATUS_OK
  21 enum XML_Status {
  22   XML_STATUS_OK = 1,
  23   XML_STATUS_ERROR = 0
  24 };
  25 #define XML_STATUS_OK    1
  26 #define XML_STATUS_ERROR 0
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 /* DAV methods */
  33 #define DAV_LOCK "LOCK"
  34 #define DAV_MKCOL "MKCOL"
  35 #define DAV_MOVE "MOVE"
  36 #define DAV_PROPFIND "PROPFIND"
  37 #define DAV_PUT "PUT"
  38 #define DAV_UNLOCK "UNLOCK"
  39 #define DAV_DELETE "DELETE"
  40
  41 /* DAV lock flags */
  42 #define DAV_PROP_LOCKWR (1u << 0)
  43 #define DAV_PROP_LOCKEX (1u << 1)
  44 #define DAV_LOCK_OK (1u << 2)
  45
  46 /* DAV XML properties */
  47 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53 #define DAV_PROPFIND_RESP ".multistatus.response"
  54 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  55 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57 /* DAV request body templates */
  58 #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>"
  59 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60 #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>"
  61
  62 #define LOCK_TIME 600
  63 #define LOCK_REFRESH 30
  64
  65 /* bits #0-15 in revision.h */
  66
  67 #define LOCAL    (1u<<16)
  68 #define REMOTE   (1u<<17)
  69 #define FETCHING (1u<<18)
  70 #define PUSHING  (1u<<19)
  71
  72 /* We allow "recursive" symbolic refs. Only within reason, though */
  73 #define MAXDEPTH 5
  74
  75 static int pushing;
  76 static int aborted;
  77 static signed char remote_dir_exists[256];
  78
  79 static struct curl_slist *no_pragma_header;
  80
  81 static int push_verbosely;
  82 static int push_all = MATCH_REFS_NONE;
  83 static int force_all;
  84 static int dry_run;
  85
  86 static struct object_list *objects;
  87
  88 struct repo
  89 {
  90         char *url;
  91         char *path;
  92         int path_len;
  93         int has_info_refs;
  94         int can_update_info_refs;
  95         int has_info_packs;
  96         struct packed_git *packs;
  97         struct remote_lock *locks;
  98 };
  99
 100 static struct repo *remote;
 101
 102 enum transfer_state {
 103         NEED_FETCH,
 104         RUN_FETCH_LOOSE,
 105         RUN_FETCH_PACKED,
 106         NEED_PUSH,
 107         RUN_MKCOL,
 108         RUN_PUT,
 109         RUN_MOVE,
 110         ABORTED,
 111         COMPLETE,
 112 };
 113
 114 struct transfer_request
 115 {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         char filename[PATH_MAX];
 123         char tmpfile[PATH_MAX];
 124         int local_fileno;
 125         FILE *local_stream;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         unsigned char real_sha1[20];
 131         git_SHA_CTX c;
 132         z_stream stream;
 133         int zret;
 134         int rename;
 135         void *userData;
 136         struct active_request_slot *slot;
 137         struct transfer_request *next;
 138 };
 139
 140 static struct transfer_request *request_queue_head;
 141
 142 struct xml_ctx
 143 {
 144         char *name;
 145         int len;
 146         char *cdata;
 147         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148         void *userData;
 149 };
 150
 151 struct remote_lock
 152 {
 153         char *url;
 154         char *owner;
 155         char *token;
 156         time_t start_time;
 157         long timeout;
 158         int refreshing;
 159         struct remote_lock *next;
 160 };
 161
 162 /* Flags that control remote_ls processing */
 163 #define PROCESS_FILES (1u << 0)
 164 #define PROCESS_DIRS  (1u << 1)
 165 #define RECURSIVE     (1u << 2)
 166
 167 /* Flags that remote_ls passes to callback functions */
 168 #define IS_DIR (1u << 0)
 169
 170 struct remote_ls_ctx
 171 {
 172         char *path;
 173         void (*userFunc)(struct remote_ls_ctx *ls);
 174         void *userData;
 175         int flags;
 176         char *dentry_name;
 177         int dentry_flags;
 178         struct remote_ls_ctx *parent;
 179 };
 180
 181 static void finish_request(struct transfer_request *request);
 182 static void release_request(struct transfer_request *request);
 183
 184 static void process_response(void *callback_data)
 185 {
 186         struct transfer_request *request =
 187                 (struct transfer_request *)callback_data;
 188
 189         finish_request(request);
 190 }
 191
 192 #ifdef USE_CURL_MULTI
 193 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 194                                void *data)
 195 {
 196         unsigned char expn[4096];
 197         size_t size = eltsize * nmemb;
 198         int posn = 0;
 199         struct transfer_request *request = (struct transfer_request *)data;
 200         do {
 201                 ssize_t retval = xwrite(request->local_fileno,
 202                                        (char *) ptr + posn, size - posn);
 203                 if (retval < 0)
 204                         return posn;
 205                 posn += retval;
 206         } while (posn < size);
 207
 208         request->stream.avail_in = size;
 209         request->stream.next_in = ptr;
 210         do {
 211                 request->stream.next_out = expn;
 212                 request->stream.avail_out = sizeof(expn);
 213                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 214                 git_SHA1_Update(&request->c, expn,
 215                             sizeof(expn) - request->stream.avail_out);
 216         } while (request->stream.avail_in && request->zret == Z_OK);
 217         data_received++;
 218         return size;
 219 }
 220
 221 static void start_fetch_loose(struct transfer_request *request)
 222 {
 223         char *hex = sha1_to_hex(request->obj->sha1);
 224         char *filename;
 225         char prevfile[PATH_MAX];
 226         char *url;
 227         char *posn;
 228         int prevlocal;
 229         unsigned char prev_buf[PREV_BUF_SIZE];
 230         ssize_t prev_read = 0;
 231         long prev_posn = 0;
 232         char range[RANGE_HEADER_SIZE];
 233         struct curl_slist *range_header = NULL;
 234         struct active_request_slot *slot;
 235
 236         filename = sha1_file_name(request->obj->sha1);
 237         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 238         snprintf(request->tmpfile, sizeof(request->tmpfile),
 239                  "%s.temp", filename);
 240
 241         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 242         unlink(prevfile);
 243         rename(request->tmpfile, prevfile);
 244         unlink(request->tmpfile);
 245
 246         if (request->local_fileno != -1)
 247                 error("fd leakage in start: %d", request->local_fileno);
 248         request->local_fileno = open(request->tmpfile,
 249                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 250         /* This could have failed due to the "lazy directory creation";
 251          * try to mkdir the last path component.
 252          */
 253         if (request->local_fileno < 0 && errno == ENOENT) {
 254                 char *dir = strrchr(request->tmpfile, '/');
 255                 if (dir) {
 256                         *dir = 0;
 257                         mkdir(request->tmpfile, 0777);
 258                         *dir = '/';
 259                 }
 260                 request->local_fileno = open(request->tmpfile,
 261                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 262         }
 263
 264         if (request->local_fileno < 0) {
 265                 request->state = ABORTED;
 266                 error("Couldn't create temporary file %s for %s: %s",
 267                       request->tmpfile, request->filename, strerror(errno));
 268                 return;
 269         }
 270
 271         memset(&request->stream, 0, sizeof(request->stream));
 272
 273         inflateInit(&request->stream);
 274
 275         git_SHA1_Init(&request->c);
 276
 277         url = xmalloc(strlen(remote->url) + 50);
 278         request->url = xmalloc(strlen(remote->url) + 50);
 279         strcpy(url, remote->url);
 280         posn = url + strlen(remote->url);
 281         strcpy(posn, "objects/");
 282         posn += 8;
 283         memcpy(posn, hex, 2);
 284         posn += 2;
 285         *(posn++) = '/';
 286         strcpy(posn, hex + 2);
 287         strcpy(request->url, url);
 288
 289         /* If a previous temp file is present, process what was already
 290            fetched. */
 291         prevlocal = open(prevfile, O_RDONLY);
 292         if (prevlocal != -1) {
 293                 do {
 294                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 295                         if (prev_read>0) {
 296                                 if (fwrite_sha1_file(prev_buf,
 297                                                      1,
 298                                                      prev_read,
 299                                                      request) == prev_read) {
 300                                         prev_posn += prev_read;
 301                                 } else {
 302                                         prev_read = -1;
 303                                 }
 304                         }
 305                 } while (prev_read > 0);
 306                 close(prevlocal);
 307         }
 308         unlink(prevfile);
 309
 310         /* Reset inflate/SHA1 if there was an error reading the previous temp
 311            file; also rewind to the beginning of the local file. */
 312         if (prev_read == -1) {
 313                 memset(&request->stream, 0, sizeof(request->stream));
 314                 inflateInit(&request->stream);
 315                 git_SHA1_Init(&request->c);
 316                 if (prev_posn>0) {
 317                         prev_posn = 0;
 318                         lseek(request->local_fileno, 0, SEEK_SET);
 319                         ftruncate(request->local_fileno, 0);
 320                 }
 321         }
 322
 323         slot = get_active_slot();
 324         slot->callback_func = process_response;
 325         slot->callback_data = request;
 326         request->slot = slot;
 327
 328         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 329         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 330         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 331         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 332         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 333
 334         /* If we have successfully processed data from a previous fetch
 335            attempt, only fetch the data we don't already have. */
 336         if (prev_posn>0) {
 337                 if (push_verbosely)
 338                         fprintf(stderr,
 339                                 "Resuming fetch of object %s at byte %ld\n",
 340                                 hex, prev_posn);
 341                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 342                 range_header = curl_slist_append(range_header, range);
 343                 curl_easy_setopt(slot->curl,
 344                                  CURLOPT_HTTPHEADER, range_header);
 345         }
 346
 347         /* Try to get the request started, abort the request on error */
 348         request->state = RUN_FETCH_LOOSE;
 349         if (!start_active_slot(slot)) {
 350                 fprintf(stderr, "Unable to start GET request\n");
 351                 remote->can_update_info_refs = 0;
 352                 release_request(request);
 353         }
 354 }
 355
 356 static void start_mkcol(struct transfer_request *request)
 357 {
 358         char *hex = sha1_to_hex(request->obj->sha1);
 359         struct active_request_slot *slot;
 360         char *posn;
 361
 362         request->url = xmalloc(strlen(remote->url) + 13);
 363         strcpy(request->url, remote->url);
 364         posn = request->url + strlen(remote->url);
 365         strcpy(posn, "objects/");
 366         posn += 8;
 367         memcpy(posn, hex, 2);
 368         posn += 2;
 369         strcpy(posn, "/");
 370
 371         slot = get_active_slot();
 372         slot->callback_func = process_response;
 373         slot->callback_data = request;
 374         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 375         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 376         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 377         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 378         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 379
 380         if (start_active_slot(slot)) {
 381                 request->slot = slot;
 382                 request->state = RUN_MKCOL;
 383         } else {
 384                 request->state = ABORTED;
 385                 free(request->url);
 386                 request->url = NULL;
 387         }
 388 }
 389 #endif
 390
 391 static void start_fetch_packed(struct transfer_request *request)
 392 {
 393         char *url;
 394         struct packed_git *target;
 395         FILE *packfile;
 396         char *filename;
 397         long prev_posn = 0;
 398         char range[RANGE_HEADER_SIZE];
 399         struct curl_slist *range_header = NULL;
 400
 401         struct transfer_request *check_request = request_queue_head;
 402         struct active_request_slot *slot;
 403
 404         target = find_sha1_pack(request->obj->sha1, remote->packs);
 405         if (!target) {
 406                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 407                 remote->can_update_info_refs = 0;
 408                 release_request(request);
 409                 return;
 410         }
 411
 412         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 413         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 414
 415         filename = sha1_pack_name(target->sha1);
 416         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 417         snprintf(request->tmpfile, sizeof(request->tmpfile),
 418                  "%s.temp", filename);
 419
 420         url = xmalloc(strlen(remote->url) + 64);
 421         sprintf(url, "%sobjects/pack/pack-%s.pack",
 422                 remote->url, sha1_to_hex(target->sha1));
 423
 424         /* Make sure there isn't another open request for this pack */
 425         while (check_request) {
 426                 if (check_request->state == RUN_FETCH_PACKED &&
 427                     !strcmp(check_request->url, url)) {
 428                         free(url);
 429                         release_request(request);
 430                         return;
 431                 }
 432                 check_request = check_request->next;
 433         }
 434
 435         packfile = fopen(request->tmpfile, "a");
 436         if (!packfile) {
 437                 fprintf(stderr, "Unable to open local file %s for pack",
 438                         request->tmpfile);
 439                 remote->can_update_info_refs = 0;
 440                 free(url);
 441                 return;
 442         }
 443
 444         slot = get_active_slot();
 445         slot->callback_func = process_response;
 446         slot->callback_data = request;
 447         request->slot = slot;
 448         request->local_stream = packfile;
 449         request->userData = target;
 450
 451         request->url = url;
 452         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 453         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 454         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 455         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 456         slot->local = packfile;
 457
 458         /* If there is data present from a previous transfer attempt,
 459            resume where it left off */
 460         prev_posn = ftell(packfile);
 461         if (prev_posn>0) {
 462                 if (push_verbosely)
 463                         fprintf(stderr,
 464                                 "Resuming fetch of pack %s at byte %ld\n",
 465                                 sha1_to_hex(target->sha1), prev_posn);
 466                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 467                 range_header = curl_slist_append(range_header, range);
 468                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 469         }
 470
 471         /* Try to get the request started, abort the request on error */
 472         request->state = RUN_FETCH_PACKED;
 473         if (!start_active_slot(slot)) {
 474                 fprintf(stderr, "Unable to start GET request\n");
 475                 remote->can_update_info_refs = 0;
 476                 release_request(request);
 477         }
 478 }
 479
 480 static void start_put(struct transfer_request *request)
 481 {
 482         char *hex = sha1_to_hex(request->obj->sha1);
 483         struct active_request_slot *slot;
 484         char *posn;
 485         enum object_type type;
 486         char hdr[50];
 487         void *unpacked;
 488         unsigned long len;
 489         int hdrlen;
 490         ssize_t size;
 491         z_stream stream;
 492
 493         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 494         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 495
 496         /* Set it up */
 497         memset(&stream, 0, sizeof(stream));
 498         deflateInit(&stream, zlib_compression_level);
 499         size = deflateBound(&stream, len + hdrlen);
 500         strbuf_init(&request->buffer.buf, size);
 501         request->buffer.posn = 0;
 502
 503         /* Compress it */
 504         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 505         stream.avail_out = size;
 506
 507         /* First header.. */
 508         stream.next_in = (void *)hdr;
 509         stream.avail_in = hdrlen;
 510         while (deflate(&stream, 0) == Z_OK)
 511                 /* nothing */;
 512
 513         /* Then the data itself.. */
 514         stream.next_in = unpacked;
 515         stream.avail_in = len;
 516         while (deflate(&stream, Z_FINISH) == Z_OK)
 517                 /* nothing */;
 518         deflateEnd(&stream);
 519         free(unpacked);
 520
 521         request->buffer.buf.len = stream.total_out;
 522
 523         request->url = xmalloc(strlen(remote->url) +
 524                                strlen(request->lock->token) + 51);
 525         strcpy(request->url, remote->url);
 526         posn = request->url + strlen(remote->url);
 527         strcpy(posn, "objects/");
 528         posn += 8;
 529         memcpy(posn, hex, 2);
 530         posn += 2;
 531         *(posn++) = '/';
 532         strcpy(posn, hex + 2);
 533         request->dest = xmalloc(strlen(request->url) + 14);
 534         sprintf(request->dest, "Destination: %s", request->url);
 535         posn += 38;
 536         *(posn++) = '_';
 537         strcpy(posn, request->lock->token);
 538
 539         slot = get_active_slot();
 540         slot->callback_func = process_response;
 541         slot->callback_data = request;
 542         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 543         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 544         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 545         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 546         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 547         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 548         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 549         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 550         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 551
 552         if (start_active_slot(slot)) {
 553                 request->slot = slot;
 554                 request->state = RUN_PUT;
 555         } else {
 556                 request->state = ABORTED;
 557                 free(request->url);
 558                 request->url = NULL;
 559         }
 560 }
 561
 562 static void start_move(struct transfer_request *request)
 563 {
 564         struct active_request_slot *slot;
 565         struct curl_slist *dav_headers = NULL;
 566
 567         slot = get_active_slot();
 568         slot->callback_func = process_response;
 569         slot->callback_data = request;
 570         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 571         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 572         dav_headers = curl_slist_append(dav_headers, request->dest);
 573         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 574         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 575         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 576         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 577
 578         if (start_active_slot(slot)) {
 579                 request->slot = slot;
 580                 request->state = RUN_MOVE;
 581         } else {
 582                 request->state = ABORTED;
 583                 free(request->url);
 584                 request->url = NULL;
 585         }
 586 }
 587
 588 static int refresh_lock(struct remote_lock *lock)
 589 {
 590         struct active_request_slot *slot;
 591         struct slot_results results;
 592         char *if_header;
 593         char timeout_header[25];
 594         struct curl_slist *dav_headers = NULL;
 595         int rc = 0;
 596
 597         lock->refreshing = 1;
 598
 599         if_header = xmalloc(strlen(lock->token) + 25);
 600         sprintf(if_header, "If: (<%s>)", lock->token);
 601         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 602         dav_headers = curl_slist_append(dav_headers, if_header);
 603         dav_headers = curl_slist_append(dav_headers, timeout_header);
 604
 605         slot = get_active_slot();
 606         slot->results = &results;
 607         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 608         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 609         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 610         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 611         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 612
 613         if (start_active_slot(slot)) {
 614                 run_active_slot(slot);
 615                 if (results.curl_result != CURLE_OK) {
 616                         fprintf(stderr, "LOCK HTTP error %ld\n",
 617                                 results.http_code);
 618                 } else {
 619                         lock->start_time = time(NULL);
 620                         rc = 1;
 621                 }
 622         }
 623
 624         lock->refreshing = 0;
 625         curl_slist_free_all(dav_headers);
 626         free(if_header);
 627
 628         return rc;
 629 }
 630
 631 static void check_locks(void)
 632 {
 633         struct remote_lock *lock = remote->locks;
 634         time_t current_time = time(NULL);
 635         int time_remaining;
 636
 637         while (lock) {
 638                 time_remaining = lock->start_time + lock->timeout -
 639                         current_time;
 640                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 641                         if (!refresh_lock(lock)) {
 642                                 fprintf(stderr,
 643                                         "Unable to refresh lock for %s\n",
 644                                         lock->url);
 645                                 aborted = 1;
 646                                 return;
 647                         }
 648                 }
 649                 lock = lock->next;
 650         }
 651 }
 652
 653 static void release_request(struct transfer_request *request)
 654 {
 655         struct transfer_request *entry = request_queue_head;
 656
 657         if (request == request_queue_head) {
 658                 request_queue_head = request->next;
 659         } else {
 660                 while (entry->next != NULL && entry->next != request)
 661                         entry = entry->next;
 662                 if (entry->next == request)
 663                         entry->next = entry->next->next;
 664         }
 665
 666         if (request->local_fileno != -1)
 667                 close(request->local_fileno);
 668         if (request->local_stream)
 669                 fclose(request->local_stream);
 670         free(request->url);
 671         free(request);
 672 }
 673
 674 static void finish_request(struct transfer_request *request)
 675 {
 676         struct stat st;
 677         struct packed_git *target;
 678         struct packed_git **lst;
 679
 680         request->curl_result = request->slot->curl_result;
 681         request->http_code = request->slot->http_code;
 682         request->slot = NULL;
 683
 684         /* Keep locks active */
 685         check_locks();
 686
 687         if (request->headers != NULL)
 688                 curl_slist_free_all(request->headers);
 689
 690         /* URL is reused for MOVE after PUT */
 691         if (request->state != RUN_PUT) {
 692                 free(request->url);
 693                 request->url = NULL;
 694         }
 695
 696         if (request->state == RUN_MKCOL) {
 697                 if (request->curl_result == CURLE_OK ||
 698                     request->http_code == 405) {
 699                         remote_dir_exists[request->obj->sha1[0]] = 1;
 700                         start_put(request);
 701                 } else {
 702                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 703                                 sha1_to_hex(request->obj->sha1),
 704                                 request->curl_result, request->http_code);
 705                         request->state = ABORTED;
 706                         aborted = 1;
 707                 }
 708         } else if (request->state == RUN_PUT) {
 709                 if (request->curl_result == CURLE_OK) {
 710                         start_move(request);
 711                 } else {
 712                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 713                                 sha1_to_hex(request->obj->sha1),
 714                                 request->curl_result, request->http_code);
 715                         request->state = ABORTED;
 716                         aborted = 1;
 717                 }
 718         } else if (request->state == RUN_MOVE) {
 719                 if (request->curl_result == CURLE_OK) {
 720                         if (push_verbosely)
 721                                 fprintf(stderr, "    sent %s\n",
 722                                         sha1_to_hex(request->obj->sha1));
 723                         request->obj->flags |= REMOTE;
 724                         release_request(request);
 725                 } else {
 726                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 727                                 sha1_to_hex(request->obj->sha1),
 728                                 request->curl_result, request->http_code);
 729                         request->state = ABORTED;
 730                         aborted = 1;
 731                 }
 732         } else if (request->state == RUN_FETCH_LOOSE) {
 733                 fchmod(request->local_fileno, 0444);
 734                 close(request->local_fileno); request->local_fileno = -1;
 735
 736                 if (request->curl_result != CURLE_OK &&
 737                     request->http_code != 416) {
 738                         if (stat(request->tmpfile, &st) == 0) {
 739                                 if (st.st_size == 0)
 740                                         unlink(request->tmpfile);
 741                         }
 742                 } else {
 743                         if (request->http_code == 416)
 744                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 745
 746                         inflateEnd(&request->stream);
 747                         git_SHA1_Final(request->real_sha1, &request->c);
 748                         if (request->zret != Z_STREAM_END) {
 749                                 unlink(request->tmpfile);
 750                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 751                                 unlink(request->tmpfile);
 752                         } else {
 753                                 request->rename =
 754                                         move_temp_to_file(
 755                                                 request->tmpfile,
 756                                                 request->filename);
 757                                 if (request->rename == 0) {
 758                                         request->obj->flags |= (LOCAL | REMOTE);
 759                                 }
 760                         }
 761                 }
 762
 763                 /* Try fetching packed if necessary */
 764                 if (request->obj->flags & LOCAL)
 765                         release_request(request);
 766                 else
 767                         start_fetch_packed(request);
 768
 769         } else if (request->state == RUN_FETCH_PACKED) {
 770                 if (request->curl_result != CURLE_OK) {
 771                         fprintf(stderr, "Unable to get pack file %s\n%s",
 772                                 request->url, curl_errorstr);
 773                         remote->can_update_info_refs = 0;
 774                 } else {
 775                         off_t pack_size = ftell(request->local_stream);
 776
 777                         fclose(request->local_stream);
 778                         request->local_stream = NULL;
 779                         if (!move_temp_to_file(request->tmpfile,
 780                                                request->filename)) {
 781                                 target = (struct packed_git *)request->userData;
 782                                 target->pack_size = pack_size;
 783                                 lst = &remote->packs;
 784                                 while (*lst != target)
 785                                         lst = &((*lst)->next);
 786                                 *lst = (*lst)->next;
 787
 788                                 if (!verify_pack(target))
 789                                         install_packed_git(target);
 790                                 else
 791                                         remote->can_update_info_refs = 0;
 792                         }
 793                 }
 794                 release_request(request);
 795         }
 796 }
 797
 798 #ifdef USE_CURL_MULTI
 799 static int fill_active_slot(void *unused)
 800 {
 801         struct transfer_request *request = request_queue_head;
 802
 803         if (aborted)
 804                 return 0;
 805
 806         for (request = request_queue_head; request; request = request->next) {
 807                 if (request->state == NEED_FETCH) {
 808                         start_fetch_loose(request);
 809                         return 1;
 810                 } else if (pushing && request->state == NEED_PUSH) {
 811                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 812                                 start_put(request);
 813                         } else {
 814                                 start_mkcol(request);
 815                         }
 816                         return 1;
 817                 }
 818         }
 819         return 0;
 820 }
 821 #endif
 822
 823 static void get_remote_object_list(unsigned char parent);
 824
 825 static void add_fetch_request(struct object *obj)
 826 {
 827         struct transfer_request *request;
 828
 829         check_locks();
 830
 831         /*
 832          * Don't fetch the object if it's known to exist locally
 833          * or is already in the request queue
 834          */
 835         if (remote_dir_exists[obj->sha1[0]] == -1)
 836                 get_remote_object_list(obj->sha1[0]);
 837         if (obj->flags & (LOCAL | FETCHING))
 838                 return;
 839
 840         obj->flags |= FETCHING;
 841         request = xmalloc(sizeof(*request));
 842         request->obj = obj;
 843         request->url = NULL;
 844         request->lock = NULL;
 845         request->headers = NULL;
 846         request->local_fileno = -1;
 847         request->local_stream = NULL;
 848         request->state = NEED_FETCH;
 849         request->next = request_queue_head;
 850         request_queue_head = request;
 851
 852 #ifdef USE_CURL_MULTI
 853         fill_active_slots();
 854         step_active_slots();
 855 #endif
 856 }
 857
 858 static int add_send_request(struct object *obj, struct remote_lock *lock)
 859 {
 860         struct transfer_request *request = request_queue_head;
 861         struct packed_git *target;
 862
 863         /* Keep locks active */
 864         check_locks();
 865
 866         /*
 867          * Don't push the object if it's known to exist on the remote
 868          * or is already in the request queue
 869          */
 870         if (remote_dir_exists[obj->sha1[0]] == -1)
 871                 get_remote_object_list(obj->sha1[0]);
 872         if (obj->flags & (REMOTE | PUSHING))
 873                 return 0;
 874         target = find_sha1_pack(obj->sha1, remote->packs);
 875         if (target) {
 876                 obj->flags |= REMOTE;
 877                 return 0;
 878         }
 879
 880         obj->flags |= PUSHING;
 881         request = xmalloc(sizeof(*request));
 882         request->obj = obj;
 883         request->url = NULL;
 884         request->lock = lock;
 885         request->headers = NULL;
 886         request->local_fileno = -1;
 887         request->local_stream = NULL;
 888         request->state = NEED_PUSH;
 889         request->next = request_queue_head;
 890         request_queue_head = request;
 891
 892 #ifdef USE_CURL_MULTI
 893         fill_active_slots();
 894         step_active_slots();
 895 #endif
 896
 897         return 1;
 898 }
 899
 900 static int fetch_index(unsigned char *sha1)
 901 {
 902         char *hex = sha1_to_hex(sha1);
 903         char *filename;
 904         char *url;
 905         char tmpfile[PATH_MAX];
 906         long prev_posn = 0;
 907         char range[RANGE_HEADER_SIZE];
 908         struct curl_slist *range_header = NULL;
 909
 910         FILE *indexfile;
 911         struct active_request_slot *slot;
 912         struct slot_results results;
 913
 914         /* Don't use the index if the pack isn't there */
 915         url = xmalloc(strlen(remote->url) + 64);
 916         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 917         slot = get_active_slot();
 918         slot->results = &results;
 919         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 920         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 921         if (start_active_slot(slot)) {
 922                 run_active_slot(slot);
 923                 if (results.curl_result != CURLE_OK) {
 924                         free(url);
 925                         return error("Unable to verify pack %s is available",
 926                                      hex);
 927                 }
 928         } else {
 929                 free(url);
 930                 return error("Unable to start request");
 931         }
 932
 933         if (has_pack_index(sha1)) {
 934                 free(url);
 935                 return 0;
 936         }
 937
 938         if (push_verbosely)
 939                 fprintf(stderr, "Getting index for pack %s\n", hex);
 940
 941         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 942
 943         filename = sha1_pack_index_name(sha1);
 944         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 945         indexfile = fopen(tmpfile, "a");
 946         if (!indexfile) {
 947                 free(url);
 948                 return error("Unable to open local file %s for pack index",
 949                              tmpfile);
 950         }
 951
 952         slot = get_active_slot();
 953         slot->results = &results;
 954         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 955         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 956         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 957         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 958         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 959         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 960         slot->local = indexfile;
 961
 962         /* If there is data present from a previous transfer attempt,
 963            resume where it left off */
 964         prev_posn = ftell(indexfile);
 965         if (prev_posn>0) {
 966                 if (push_verbosely)
 967                         fprintf(stderr,
 968                                 "Resuming fetch of index for pack %s at byte %ld\n",
 969                                 hex, prev_posn);
 970                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 971                 range_header = curl_slist_append(range_header, range);
 972                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 973         }
 974
 975         if (start_active_slot(slot)) {
 976                 run_active_slot(slot);
 977                 if (results.curl_result != CURLE_OK) {
 978                         free(url);
 979                         fclose(indexfile);
 980                         return error("Unable to get pack index %s\n%s", url,
 981                                      curl_errorstr);
 982                 }
 983         } else {
 984                 free(url);
 985                 fclose(indexfile);
 986                 return error("Unable to start request");
 987         }
 988
 989         free(url);
 990         fclose(indexfile);
 991
 992         return move_temp_to_file(tmpfile, filename);
 993 }
 994
 995 static int setup_index(unsigned char *sha1)
 996 {
 997         struct packed_git *new_pack;
 998
 999         if (fetch_index(sha1))
1000                 return -1;
1001
1002         new_pack = parse_pack_index(sha1);
1003         new_pack->next = remote->packs;
1004         remote->packs = new_pack;
1005         return 0;
1006 }
1007
1008 static int fetch_indices(void)
1009 {
1010         unsigned char sha1[20];
1011         char *url;
1012         struct strbuf buffer = STRBUF_INIT;
1013         char *data;
1014         int i = 0;
1015
1016         struct active_request_slot *slot;
1017         struct slot_results results;
1018
1019         if (push_verbosely)
1020                 fprintf(stderr, "Getting pack list\n");
1021
1022         url = xmalloc(strlen(remote->url) + 20);
1023         sprintf(url, "%sobjects/info/packs", remote->url);
1024
1025         slot = get_active_slot();
1026         slot->results = &results;
1027         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1028         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1029         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1030         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1031         if (start_active_slot(slot)) {
1032                 run_active_slot(slot);
1033                 if (results.curl_result != CURLE_OK) {
1034                         strbuf_release(&buffer);
1035                         free(url);
1036                         if (results.http_code == 404)
1037                                 return 0;
1038                         else
1039                                 return error("%s", curl_errorstr);
1040                 }
1041         } else {
1042                 strbuf_release(&buffer);
1043                 free(url);
1044                 return error("Unable to start request");
1045         }
1046         free(url);
1047
1048         data = buffer.buf;
1049         while (i < buffer.len) {
1050                 switch (data[i]) {
1051                 case 'P':
1052                         i++;
1053                         if (i + 52 < buffer.len &&
1054                             !prefixcmp(data + i, " pack-") &&
1055                             !prefixcmp(data + i + 46, ".pack\n")) {
1056                                 get_sha1_hex(data + i + 6, sha1);
1057                                 setup_index(sha1);
1058                                 i += 51;
1059                                 break;
1060                         }
1061                 default:
1062                         while (data[i] != '\n')
1063                                 i++;
1064                 }
1065                 i++;
1066         }
1067
1068         strbuf_release(&buffer);
1069         return 0;
1070 }
1071
1072 static void one_remote_object(const char *hex)
1073 {
1074         unsigned char sha1[20];
1075         struct object *obj;
1076
1077         if (get_sha1_hex(hex, sha1) != 0)
1078                 return;
1079
1080         obj = lookup_object(sha1);
1081         if (!obj)
1082                 obj = parse_object(sha1);
1083
1084         /* Ignore remote objects that don't exist locally */
1085         if (!obj)
1086                 return;
1087
1088         obj->flags |= REMOTE;
1089         if (!object_list_contains(objects, obj))
1090                 object_list_insert(obj, &objects);
1091 }
1092
1093 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1094 {
1095         int *lock_flags = (int *)ctx->userData;
1096
1097         if (tag_closed) {
1098                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1099                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1100                             (*lock_flags & DAV_PROP_LOCKWR)) {
1101                                 *lock_flags |= DAV_LOCK_OK;
1102                         }
1103                         *lock_flags &= DAV_LOCK_OK;
1104                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1105                         *lock_flags |= DAV_PROP_LOCKWR;
1106                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1107                         *lock_flags |= DAV_PROP_LOCKEX;
1108                 }
1109         }
1110 }
1111
1112 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1113 {
1114         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1115
1116         if (tag_closed && ctx->cdata) {
1117                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1118                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1119                         strcpy(lock->owner, ctx->cdata);
1120                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1121                         if (!prefixcmp(ctx->cdata, "Second-"))
1122                                 lock->timeout =
1123                                         strtol(ctx->cdata + 7, NULL, 10);
1124                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1125                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1126                         strcpy(lock->token, ctx->cdata);
1127                 }
1128         }
1129 }
1130
1131 static void one_remote_ref(char *refname);
1132
1133 static void
1134 xml_start_tag(void *userData, const char *name, const char **atts)
1135 {
1136         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1137         const char *c = strchr(name, ':');
1138         int new_len;
1139
1140         if (c == NULL)
1141                 c = name;
1142         else
1143                 c++;
1144
1145         new_len = strlen(ctx->name) + strlen(c) + 2;
1146
1147         if (new_len > ctx->len) {
1148                 ctx->name = xrealloc(ctx->name, new_len);
1149                 ctx->len = new_len;
1150         }
1151         strcat(ctx->name, ".");
1152         strcat(ctx->name, c);
1153
1154         free(ctx->cdata);
1155         ctx->cdata = NULL;
1156
1157         ctx->userFunc(ctx, 0);
1158 }
1159
1160 static void
1161 xml_end_tag(void *userData, const char *name)
1162 {
1163         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1164         const char *c = strchr(name, ':');
1165         char *ep;
1166
1167         ctx->userFunc(ctx, 1);
1168
1169         if (c == NULL)
1170                 c = name;
1171         else
1172                 c++;
1173
1174         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1175         *ep = 0;
1176 }
1177
1178 static void
1179 xml_cdata(void *userData, const XML_Char *s, int len)
1180 {
1181         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1182         free(ctx->cdata);
1183         ctx->cdata = xmemdupz(s, len);
1184 }
1185
1186 static struct remote_lock *lock_remote(const char *path, long timeout)
1187 {
1188         struct active_request_slot *slot;
1189         struct slot_results results;
1190         struct buffer out_buffer = { STRBUF_INIT, 0 };
1191         struct strbuf in_buffer = STRBUF_INIT;
1192         char *url;
1193         char *ep;
1194         char timeout_header[25];
1195         struct remote_lock *lock = NULL;
1196         struct curl_slist *dav_headers = NULL;
1197         struct xml_ctx ctx;
1198
1199         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1200         sprintf(url, "%s%s", remote->url, path);
1201
1202         /* Make sure leading directories exist for the remote ref */
1203         ep = strchr(url + strlen(remote->url) + 1, '/');
1204         while (ep) {
1205                 *ep = 0;
1206                 slot = get_active_slot();
1207                 slot->results = &results;
1208                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1209                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1210                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1211                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1212                 if (start_active_slot(slot)) {
1213                         run_active_slot(slot);
1214                         if (results.curl_result != CURLE_OK &&
1215                             results.http_code != 405) {
1216                                 fprintf(stderr,
1217                                         "Unable to create branch path %s\n",
1218                                         url);
1219                                 free(url);
1220                                 return NULL;
1221                         }
1222                 } else {
1223                         fprintf(stderr, "Unable to start MKCOL request\n");
1224                         free(url);
1225                         return NULL;
1226                 }
1227                 *ep = '/';
1228                 ep = strchr(ep + 1, '/');
1229         }
1230
1231         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1232
1233         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1234         dav_headers = curl_slist_append(dav_headers, timeout_header);
1235         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1236
1237         slot = get_active_slot();
1238         slot->results = &results;
1239         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1240         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1241         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1242         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1243         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1244         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1245         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1246         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1247         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1248
1249         lock = xcalloc(1, sizeof(*lock));
1250         lock->timeout = -1;
1251
1252         if (start_active_slot(slot)) {
1253                 run_active_slot(slot);
1254                 if (results.curl_result == CURLE_OK) {
1255                         XML_Parser parser = XML_ParserCreate(NULL);
1256                         enum XML_Status result;
1257                         ctx.name = xcalloc(10, 1);
1258                         ctx.len = 0;
1259                         ctx.cdata = NULL;
1260                         ctx.userFunc = handle_new_lock_ctx;
1261                         ctx.userData = lock;
1262                         XML_SetUserData(parser, &ctx);
1263                         XML_SetElementHandler(parser, xml_start_tag,
1264                                               xml_end_tag);
1265                         XML_SetCharacterDataHandler(parser, xml_cdata);
1266                         result = XML_Parse(parser, in_buffer.buf,
1267                                            in_buffer.len, 1);
1268                         free(ctx.name);
1269                         if (result != XML_STATUS_OK) {
1270                                 fprintf(stderr, "XML error: %s\n",
1271                                         XML_ErrorString(
1272                                                 XML_GetErrorCode(parser)));
1273                                 lock->timeout = -1;
1274                         }
1275                         XML_ParserFree(parser);
1276                 }
1277         } else {
1278                 fprintf(stderr, "Unable to start LOCK request\n");
1279         }
1280
1281         curl_slist_free_all(dav_headers);
1282         strbuf_release(&out_buffer.buf);
1283         strbuf_release(&in_buffer);
1284
1285         if (lock->token == NULL || lock->timeout <= 0) {
1286                 free(lock->token);
1287                 free(lock->owner);
1288                 free(url);
1289                 free(lock);
1290                 lock = NULL;
1291         } else {
1292                 lock->url = url;
1293                 lock->start_time = time(NULL);
1294                 lock->next = remote->locks;
1295                 remote->locks = lock;
1296         }
1297
1298         return lock;
1299 }
1300
1301 static int unlock_remote(struct remote_lock *lock)
1302 {
1303         struct active_request_slot *slot;
1304         struct slot_results results;
1305         struct remote_lock *prev = remote->locks;
1306         char *lock_token_header;
1307         struct curl_slist *dav_headers = NULL;
1308         int rc = 0;
1309
1310         lock_token_header = xmalloc(strlen(lock->token) + 31);
1311         sprintf(lock_token_header, "Lock-Token: <%s>",
1312                 lock->token);
1313         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1314
1315         slot = get_active_slot();
1316         slot->results = &results;
1317         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1318         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1319         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1320         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1321
1322         if (start_active_slot(slot)) {
1323                 run_active_slot(slot);
1324                 if (results.curl_result == CURLE_OK)
1325                         rc = 1;
1326                 else
1327                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1328                                 results.http_code);
1329         } else {
1330                 fprintf(stderr, "Unable to start UNLOCK request\n");
1331         }
1332
1333         curl_slist_free_all(dav_headers);
1334         free(lock_token_header);
1335
1336         if (remote->locks == lock) {
1337                 remote->locks = lock->next;
1338         } else {
1339                 while (prev && prev->next != lock)
1340                         prev = prev->next;
1341                 if (prev)
1342                         prev->next = prev->next->next;
1343         }
1344
1345         free(lock->owner);
1346         free(lock->url);
1347         free(lock->token);
1348         free(lock);
1349
1350         return rc;
1351 }
1352
1353 static void remove_locks(void)
1354 {
1355         struct remote_lock *lock = remote->locks;
1356
1357         fprintf(stderr, "Removing remote locks...\n");
1358         while (lock) {
1359                 unlock_remote(lock);
1360                 lock = lock->next;
1361         }
1362 }
1363
1364 static void remove_locks_on_signal(int signo)
1365 {
1366         remove_locks();
1367         sigchain_pop(signo);
1368         raise(signo);
1369 }
1370
1371 static void remote_ls(const char *path, int flags,
1372                       void (*userFunc)(struct remote_ls_ctx *ls),
1373                       void *userData);
1374
1375 static void process_ls_object(struct remote_ls_ctx *ls)
1376 {
1377         unsigned int *parent = (unsigned int *)ls->userData;
1378         char *path = ls->dentry_name;
1379         char *obj_hex;
1380
1381         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1382                 remote_dir_exists[*parent] = 1;
1383                 return;
1384         }
1385
1386         if (strlen(path) != 49)
1387                 return;
1388         path += 8;
1389         obj_hex = xmalloc(strlen(path));
1390         /* NB: path is not null-terminated, can not use strlcpy here */
1391         memcpy(obj_hex, path, 2);
1392         strcpy(obj_hex + 2, path + 3);
1393         one_remote_object(obj_hex);
1394         free(obj_hex);
1395 }
1396
1397 static void process_ls_ref(struct remote_ls_ctx *ls)
1398 {
1399         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1400                 fprintf(stderr, "  %s\n", ls->dentry_name);
1401                 return;
1402         }
1403
1404         if (!(ls->dentry_flags & IS_DIR))
1405                 one_remote_ref(ls->dentry_name);
1406 }
1407
1408 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1409 {
1410         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1411
1412         if (tag_closed) {
1413                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1414                         if (ls->dentry_flags & IS_DIR) {
1415                                 if (ls->flags & PROCESS_DIRS) {
1416                                         ls->userFunc(ls);
1417                                 }
1418                                 if (strcmp(ls->dentry_name, ls->path) &&
1419                                     ls->flags & RECURSIVE) {
1420                                         remote_ls(ls->dentry_name,
1421                                                   ls->flags,
1422                                                   ls->userFunc,
1423                                                   ls->userData);
1424                                 }
1425                         } else if (ls->flags & PROCESS_FILES) {
1426                                 ls->userFunc(ls);
1427                         }
1428                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1429                         char *path = ctx->cdata;
1430                         if (*ctx->cdata == 'h') {
1431                                 path = strstr(path, "//");
1432                                 if (path) {
1433                                         path = strchr(path+2, '/');
1434                                 }
1435                         }
1436                         if (path) {
1437                                 path += remote->path_len;
1438                         }
1439                         ls->dentry_name = xmalloc(strlen(path) -
1440                                                   remote->path_len + 1);
1441                         strcpy(ls->dentry_name, path + remote->path_len);
1442                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1443                         ls->dentry_flags |= IS_DIR;
1444                 }
1445         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1446                 free(ls->dentry_name);
1447                 ls->dentry_name = NULL;
1448                 ls->dentry_flags = 0;
1449         }
1450 }
1451
1452 static void remote_ls(const char *path, int flags,
1453                       void (*userFunc)(struct remote_ls_ctx *ls),
1454                       void *userData)
1455 {
1456         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1457         struct active_request_slot *slot;
1458         struct slot_results results;
1459         struct strbuf in_buffer = STRBUF_INIT;
1460         struct buffer out_buffer = { STRBUF_INIT, 0 };
1461         struct curl_slist *dav_headers = NULL;
1462         struct xml_ctx ctx;
1463         struct remote_ls_ctx ls;
1464
1465         ls.flags = flags;
1466         ls.path = xstrdup(path);
1467         ls.dentry_name = NULL;
1468         ls.dentry_flags = 0;
1469         ls.userData = userData;
1470         ls.userFunc = userFunc;
1471
1472         sprintf(url, "%s%s", remote->url, path);
1473
1474         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1475
1476         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1477         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1478
1479         slot = get_active_slot();
1480         slot->results = &results;
1481         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1482         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1483         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1484         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1485         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1486         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1487         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1488         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1489         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1490
1491         if (start_active_slot(slot)) {
1492                 run_active_slot(slot);
1493                 if (results.curl_result == CURLE_OK) {
1494                         XML_Parser parser = XML_ParserCreate(NULL);
1495                         enum XML_Status result;
1496                         ctx.name = xcalloc(10, 1);
1497                         ctx.len = 0;
1498                         ctx.cdata = NULL;
1499                         ctx.userFunc = handle_remote_ls_ctx;
1500                         ctx.userData = &ls;
1501                         XML_SetUserData(parser, &ctx);
1502                         XML_SetElementHandler(parser, xml_start_tag,
1503                                               xml_end_tag);
1504                         XML_SetCharacterDataHandler(parser, xml_cdata);
1505                         result = XML_Parse(parser, in_buffer.buf,
1506                                            in_buffer.len, 1);
1507                         free(ctx.name);
1508
1509                         if (result != XML_STATUS_OK) {
1510                                 fprintf(stderr, "XML error: %s\n",
1511                                         XML_ErrorString(
1512                                                 XML_GetErrorCode(parser)));
1513                         }
1514                         XML_ParserFree(parser);
1515                 }
1516         } else {
1517                 fprintf(stderr, "Unable to start PROPFIND request\n");
1518         }
1519
1520         free(ls.path);
1521         free(url);
1522         strbuf_release(&out_buffer.buf);
1523         strbuf_release(&in_buffer);
1524         curl_slist_free_all(dav_headers);
1525 }
1526
1527 static void get_remote_object_list(unsigned char parent)
1528 {
1529         char path[] = "objects/XX/";
1530         static const char hex[] = "0123456789abcdef";
1531         unsigned int val = parent;
1532
1533         path[8] = hex[val >> 4];
1534         path[9] = hex[val & 0xf];
1535         remote_dir_exists[val] = 0;
1536         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1537                   process_ls_object, &val);
1538 }
1539
1540 static int locking_available(void)
1541 {
1542         struct active_request_slot *slot;
1543         struct slot_results results;
1544         struct strbuf in_buffer = STRBUF_INIT;
1545         struct buffer out_buffer = { STRBUF_INIT, 0 };
1546         struct curl_slist *dav_headers = NULL;
1547         struct xml_ctx ctx;
1548         int lock_flags = 0;
1549
1550         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1551
1552         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1553         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1554
1555         slot = get_active_slot();
1556         slot->results = &results;
1557         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1558         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1559         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1560         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1561         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1562         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1563         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1564         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1565         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1566
1567         if (start_active_slot(slot)) {
1568                 run_active_slot(slot);
1569                 if (results.curl_result == CURLE_OK) {
1570                         XML_Parser parser = XML_ParserCreate(NULL);
1571                         enum XML_Status result;
1572                         ctx.name = xcalloc(10, 1);
1573                         ctx.len = 0;
1574                         ctx.cdata = NULL;
1575                         ctx.userFunc = handle_lockprop_ctx;
1576                         ctx.userData = &lock_flags;
1577                         XML_SetUserData(parser, &ctx);
1578                         XML_SetElementHandler(parser, xml_start_tag,
1579                                               xml_end_tag);
1580                         result = XML_Parse(parser, in_buffer.buf,
1581                                            in_buffer.len, 1);
1582                         free(ctx.name);
1583
1584                         if (result != XML_STATUS_OK) {
1585                                 fprintf(stderr, "XML error: %s\n",
1586                                         XML_ErrorString(
1587                                                 XML_GetErrorCode(parser)));
1588                                 lock_flags = 0;
1589                         }
1590                         XML_ParserFree(parser);
1591                         if (!lock_flags)
1592                                 error("Error: no DAV locking support on %s",
1593                                       remote->url);
1594
1595                 } else {
1596                         error("Cannot access URL %s, return code %d",
1597                               remote->url, results.curl_result);
1598                         lock_flags = 0;
1599                 }
1600         } else {
1601                 error("Unable to start PROPFIND request on %s", remote->url);
1602         }
1603
1604         strbuf_release(&out_buffer.buf);
1605         strbuf_release(&in_buffer);
1606         curl_slist_free_all(dav_headers);
1607
1608         return lock_flags;
1609 }
1610
1611 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1612 {
1613         struct object_list *entry = xmalloc(sizeof(struct object_list));
1614         entry->item = obj;
1615         entry->next = *p;
1616         *p = entry;
1617         return &entry->next;
1618 }
1619
1620 static struct object_list **process_blob(struct blob *blob,
1621                                          struct object_list **p,
1622                                          struct name_path *path,
1623                                          const char *name)
1624 {
1625         struct object *obj = &blob->object;
1626
1627         obj->flags |= LOCAL;
1628
1629         if (obj->flags & (UNINTERESTING | SEEN))
1630                 return p;
1631
1632         obj->flags |= SEEN;
1633         return add_one_object(obj, p);
1634 }
1635
1636 static struct object_list **process_tree(struct tree *tree,
1637                                          struct object_list **p,
1638                                          struct name_path *path,
1639                                          const char *name)
1640 {
1641         struct object *obj = &tree->object;
1642         struct tree_desc desc;
1643         struct name_entry entry;
1644         struct name_path me;
1645
1646         obj->flags |= LOCAL;
1647
1648         if (obj->flags & (UNINTERESTING | SEEN))
1649                 return p;
1650         if (parse_tree(tree) < 0)
1651                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1652
1653         obj->flags |= SEEN;
1654         name = xstrdup(name);
1655         p = add_one_object(obj, p);
1656         me.up = path;
1657         me.elem = name;
1658         me.elem_len = strlen(name);
1659
1660         init_tree_desc(&desc, tree->buffer, tree->size);
1661
1662         while (tree_entry(&desc, &entry))
1663                 switch (object_type(entry.mode)) {
1664                 case OBJ_TREE:
1665                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1666                         break;
1667                 case OBJ_BLOB:
1668                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1669                         break;
1670                 default:
1671                         /* Subproject commit - not in this repository */
1672                         break;
1673                 }
1674
1675         free(tree->buffer);
1676         tree->buffer = NULL;
1677         return p;
1678 }
1679
1680 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1681 {
1682         int i;
1683         struct commit *commit;
1684         struct object_list **p = &objects;
1685         int count = 0;
1686
1687         while ((commit = get_revision(revs)) != NULL) {
1688                 p = process_tree(commit->tree, p, NULL, "");
1689                 commit->object.flags |= LOCAL;
1690                 if (!(commit->object.flags & UNINTERESTING))
1691                         count += add_send_request(&commit->object, lock);
1692         }
1693
1694         for (i = 0; i < revs->pending.nr; i++) {
1695                 struct object_array_entry *entry = revs->pending.objects + i;
1696                 struct object *obj = entry->item;
1697                 const char *name = entry->name;
1698
1699                 if (obj->flags & (UNINTERESTING | SEEN))
1700                         continue;
1701                 if (obj->type == OBJ_TAG) {
1702                         obj->flags |= SEEN;
1703                         p = add_one_object(obj, p);
1704                         continue;
1705                 }
1706                 if (obj->type == OBJ_TREE) {
1707                         p = process_tree((struct tree *)obj, p, NULL, name);
1708                         continue;
1709                 }
1710                 if (obj->type == OBJ_BLOB) {
1711                         p = process_blob((struct blob *)obj, p, NULL, name);
1712                         continue;
1713                 }
1714                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1715         }
1716
1717         while (objects) {
1718                 if (!(objects->item->flags & UNINTERESTING))
1719                         count += add_send_request(objects->item, lock);
1720                 objects = objects->next;
1721         }
1722
1723         return count;
1724 }
1725
1726 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1727 {
1728         struct active_request_slot *slot;
1729         struct slot_results results;
1730         char *if_header;
1731         struct buffer out_buffer = { STRBUF_INIT, 0 };
1732         struct curl_slist *dav_headers = NULL;
1733
1734         if_header = xmalloc(strlen(lock->token) + 25);
1735         sprintf(if_header, "If: (<%s>)", lock->token);
1736         dav_headers = curl_slist_append(dav_headers, if_header);
1737
1738         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1739
1740         slot = get_active_slot();
1741         slot->results = &results;
1742         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1743         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1744         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1745         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1746         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1747         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1748         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1749         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1750         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1751
1752         if (start_active_slot(slot)) {
1753                 run_active_slot(slot);
1754                 strbuf_release(&out_buffer.buf);
1755                 free(if_header);
1756                 if (results.curl_result != CURLE_OK) {
1757                         fprintf(stderr,
1758                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1759                                 results.curl_result, results.http_code);
1760                         /* We should attempt recovery? */
1761                         return 0;
1762                 }
1763         } else {
1764                 strbuf_release(&out_buffer.buf);
1765                 free(if_header);
1766                 fprintf(stderr, "Unable to start PUT request\n");
1767                 return 0;
1768         }
1769
1770         return 1;
1771 }
1772
1773 static struct ref *local_refs, **local_tail;
1774 static struct ref *remote_refs, **remote_tail;
1775
1776 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1777 {
1778         struct ref *ref;
1779         int len = strlen(refname) + 1;
1780         ref = xcalloc(1, sizeof(*ref) + len);
1781         hashcpy(ref->new_sha1, sha1);
1782         memcpy(ref->name, refname, len);
1783         *local_tail = ref;
1784         local_tail = &ref->next;
1785         return 0;
1786 }
1787
1788 static void one_remote_ref(char *refname)
1789 {
1790         struct ref *ref;
1791         struct object *obj;
1792
1793         ref = alloc_ref(refname);
1794
1795         if (http_fetch_ref(remote->url, ref) != 0) {
1796                 fprintf(stderr,
1797                         "Unable to fetch ref %s from %s\n",
1798                         refname, remote->url);
1799                 free(ref);
1800                 return;
1801         }
1802
1803         /*
1804          * Fetch a copy of the object if it doesn't exist locally - it
1805          * may be required for updating server info later.
1806          */
1807         if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1808                 obj = lookup_unknown_object(ref->old_sha1);
1809                 if (obj) {
1810                         fprintf(stderr, "  fetch %s for %s\n",
1811                                 sha1_to_hex(ref->old_sha1), refname);
1812                         add_fetch_request(obj);
1813                 }
1814         }
1815
1816         *remote_tail = ref;
1817         remote_tail = &ref->next;
1818 }
1819
1820 static void get_local_heads(void)
1821 {
1822         local_tail = &local_refs;
1823         for_each_ref(one_local_ref, NULL);
1824 }
1825
1826 static void get_dav_remote_heads(void)
1827 {
1828         remote_tail = &remote_refs;
1829         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1830 }
1831
1832 static int is_zero_sha1(const unsigned char *sha1)
1833 {
1834         int i;
1835
1836         for (i = 0; i < 20; i++) {
1837                 if (*sha1++)
1838                         return 0;
1839         }
1840         return 1;
1841 }
1842
1843 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1844 {
1845         while (list) {
1846                 struct commit_list *temp = list;
1847                 temp->item->object.flags &= ~mark;
1848                 list = temp->next;
1849                 free(temp);
1850         }
1851 }
1852
1853 static int ref_newer(const unsigned char *new_sha1,
1854                      const unsigned char *old_sha1)
1855 {
1856         struct object *o;
1857         struct commit *old, *new;
1858         struct commit_list *list, *used;
1859         int found = 0;
1860
1861         /* Both new and old must be commit-ish and new is descendant of
1862          * old.  Otherwise we require --force.
1863          */
1864         o = deref_tag(parse_object(old_sha1), NULL, 0);
1865         if (!o || o->type != OBJ_COMMIT)
1866                 return 0;
1867         old = (struct commit *) o;
1868
1869         o = deref_tag(parse_object(new_sha1), NULL, 0);
1870         if (!o || o->type != OBJ_COMMIT)
1871                 return 0;
1872         new = (struct commit *) o;
1873
1874         if (parse_commit(new) < 0)
1875                 return 0;
1876
1877         used = list = NULL;
1878         commit_list_insert(new, &list);
1879         while (list) {
1880                 new = pop_most_recent_commit(&list, TMP_MARK);
1881                 commit_list_insert(new, &used);
1882                 if (new == old) {
1883                         found = 1;
1884                         break;
1885                 }
1886         }
1887         unmark_and_free(list, TMP_MARK);
1888         unmark_and_free(used, TMP_MARK);
1889         return found;
1890 }
1891
1892 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1893 {
1894         struct strbuf *buf = (struct strbuf *)ls->userData;
1895         struct object *o;
1896         int len;
1897         char *ref_info;
1898         struct ref *ref;
1899
1900         ref = alloc_ref(ls->dentry_name);
1901
1902         if (http_fetch_ref(remote->url, ref) != 0) {
1903                 fprintf(stderr,
1904                         "Unable to fetch ref %s from %s\n",
1905                         ls->dentry_name, remote->url);
1906                 aborted = 1;
1907                 free(ref);
1908                 return;
1909         }
1910
1911         o = parse_object(ref->old_sha1);
1912         if (!o) {
1913                 fprintf(stderr,
1914                         "Unable to parse object %s for remote ref %s\n",
1915                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1916                 aborted = 1;
1917                 free(ref);
1918                 return;
1919         }
1920
1921         len = strlen(ls->dentry_name) + 42;
1922         ref_info = xcalloc(len + 1, 1);
1923         sprintf(ref_info, "%s   %s\n",
1924                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1925         fwrite_buffer(ref_info, 1, len, buf);
1926         free(ref_info);
1927
1928         if (o->type == OBJ_TAG) {
1929                 o = deref_tag(o, ls->dentry_name, 0);
1930                 if (o) {
1931                         len = strlen(ls->dentry_name) + 45;
1932                         ref_info = xcalloc(len + 1, 1);
1933                         sprintf(ref_info, "%s   %s^{}\n",
1934                                 sha1_to_hex(o->sha1), ls->dentry_name);
1935                         fwrite_buffer(ref_info, 1, len, buf);
1936                         free(ref_info);
1937                 }
1938         }
1939         free(ref);
1940 }
1941
1942 static void update_remote_info_refs(struct remote_lock *lock)
1943 {
1944         struct buffer buffer = { STRBUF_INIT, 0 };
1945         struct active_request_slot *slot;
1946         struct slot_results results;
1947         char *if_header;
1948         struct curl_slist *dav_headers = NULL;
1949
1950         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1951                   add_remote_info_ref, &buffer.buf);
1952         if (!aborted) {
1953                 if_header = xmalloc(strlen(lock->token) + 25);
1954                 sprintf(if_header, "If: (<%s>)", lock->token);
1955                 dav_headers = curl_slist_append(dav_headers, if_header);
1956
1957                 slot = get_active_slot();
1958                 slot->results = &results;
1959                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1960                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1961                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1962                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1963                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1964                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1965                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1966                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1967                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1968
1969                 if (start_active_slot(slot)) {
1970                         run_active_slot(slot);
1971                         if (results.curl_result != CURLE_OK) {
1972                                 fprintf(stderr,
1973                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1974                                         results.curl_result, results.http_code);
1975                         }
1976                 }
1977                 free(if_header);
1978         }
1979         strbuf_release(&buffer.buf);
1980 }
1981
1982 static int remote_exists(const char *path)
1983 {
1984         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1985         struct active_request_slot *slot;
1986         struct slot_results results;
1987         int ret = -1;
1988
1989         sprintf(url, "%s%s", remote->url, path);
1990
1991         slot = get_active_slot();
1992         slot->results = &results;
1993         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1994         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1995
1996         if (start_active_slot(slot)) {
1997                 run_active_slot(slot);
1998                 if (results.http_code == 404)
1999                         ret = 0;
2000                 else if (results.curl_result == CURLE_OK)
2001                         ret = 1;
2002                 else
2003                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2004         } else {
2005                 fprintf(stderr, "Unable to start HEAD request\n");
2006         }
2007
2008         free(url);
2009         return ret;
2010 }
2011
2012 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2013 {
2014         char *url;
2015         struct strbuf buffer = STRBUF_INIT;
2016         struct active_request_slot *slot;
2017         struct slot_results results;
2018
2019         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2020         sprintf(url, "%s%s", remote->url, path);
2021
2022         slot = get_active_slot();
2023         slot->results = &results;
2024         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2025         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2026         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2028         if (start_active_slot(slot)) {
2029                 run_active_slot(slot);
2030                 if (results.curl_result != CURLE_OK) {
2031                         die("Couldn't get %s for remote symref\n%s",
2032                             url, curl_errorstr);
2033                 }
2034         } else {
2035                 die("Unable to start remote symref request");
2036         }
2037         free(url);
2038
2039         free(*symref);
2040         *symref = NULL;
2041         hashclr(sha1);
2042
2043         if (buffer.len == 0)
2044                 return;
2045
2046         /* If it's a symref, set the refname; otherwise try for a sha1 */
2047         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2048                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2049         } else {
2050                 get_sha1_hex(buffer.buf, sha1);
2051         }
2052
2053         strbuf_release(&buffer);
2054 }
2055
2056 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2057 {
2058         struct commit *head = lookup_commit(head_sha1);
2059         struct commit *branch = lookup_commit(branch_sha1);
2060         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2061
2062         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2063 }
2064
2065 static int delete_remote_branch(char *pattern, int force)
2066 {
2067         struct ref *refs = remote_refs;
2068         struct ref *remote_ref = NULL;
2069         unsigned char head_sha1[20];
2070         char *symref = NULL;
2071         int match;
2072         int patlen = strlen(pattern);
2073         int i;
2074         struct active_request_slot *slot;
2075         struct slot_results results;
2076         char *url;
2077
2078         /* Find the remote branch(es) matching the specified branch name */
2079         for (match = 0; refs; refs = refs->next) {
2080                 char *name = refs->name;
2081                 int namelen = strlen(name);
2082                 if (namelen < patlen ||
2083                     memcmp(name + namelen - patlen, pattern, patlen))
2084                         continue;
2085                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2086                         continue;
2087                 match++;
2088                 remote_ref = refs;
2089         }
2090         if (match == 0)
2091                 return error("No remote branch matches %s", pattern);
2092         if (match != 1)
2093                 return error("More than one remote branch matches %s",
2094                              pattern);
2095
2096         /*
2097          * Remote HEAD must be a symref (not exactly foolproof; a remote
2098          * symlink to a symref will look like a symref)
2099          */
2100         fetch_symref("HEAD", &symref, head_sha1);
2101         if (!symref)
2102                 return error("Remote HEAD is not a symref");
2103
2104         /* Remote branch must not be the remote HEAD */
2105         for (i=0; symref && i<MAXDEPTH; i++) {
2106                 if (!strcmp(remote_ref->name, symref))
2107                         return error("Remote branch %s is the current HEAD",
2108                                      remote_ref->name);
2109                 fetch_symref(symref, &symref, head_sha1);
2110         }
2111
2112         /* Run extra sanity checks if delete is not forced */
2113         if (!force) {
2114                 /* Remote HEAD must resolve to a known object */
2115                 if (symref)
2116                         return error("Remote HEAD symrefs too deep");
2117                 if (is_zero_sha1(head_sha1))
2118                         return error("Unable to resolve remote HEAD");
2119                 if (!has_sha1_file(head_sha1))
2120                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2121
2122                 /* Remote branch must resolve to a known object */
2123                 if (is_zero_sha1(remote_ref->old_sha1))
2124                         return error("Unable to resolve remote branch %s",
2125                                      remote_ref->name);
2126                 if (!has_sha1_file(remote_ref->old_sha1))
2127                         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));
2128
2129                 /* Remote branch must be an ancestor of remote HEAD */
2130                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2131                         return error("The branch '%s' is not an ancestor "
2132                                      "of your current HEAD.\n"
2133                                      "If you are sure you want to delete it,"
2134                                      " run:\n\t'git http-push -D %s %s'",
2135                                      remote_ref->name, remote->url, pattern);
2136                 }
2137         }
2138
2139         /* Send delete request */
2140         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2141         if (dry_run)
2142                 return 0;
2143         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2144         sprintf(url, "%s%s", remote->url, remote_ref->name);
2145         slot = get_active_slot();
2146         slot->results = &results;
2147         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2148         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2149         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2150         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2151         if (start_active_slot(slot)) {
2152                 run_active_slot(slot);
2153                 free(url);
2154                 if (results.curl_result != CURLE_OK)
2155                         return error("DELETE request failed (%d/%ld)\n",
2156                                      results.curl_result, results.http_code);
2157         } else {
2158                 free(url);
2159                 return error("Unable to start DELETE request");
2160         }
2161
2162         return 0;
2163 }
2164
2165 int main(int argc, char **argv)
2166 {
2167         struct transfer_request *request;
2168         struct transfer_request *next_request;
2169         int nr_refspec = 0;
2170         char **refspec = NULL;
2171         struct remote_lock *ref_lock = NULL;
2172         struct remote_lock *info_ref_lock = NULL;
2173         struct rev_info revs;
2174         int delete_branch = 0;
2175         int force_delete = 0;
2176         int objects_to_send;
2177         int rc = 0;
2178         int i;
2179         int new_refs;
2180         struct ref *ref;
2181         char *rewritten_url = NULL;
2182
2183         setup_git_directory();
2184
2185         remote = xcalloc(sizeof(*remote), 1);
2186
2187         argv++;
2188         for (i = 1; i < argc; i++, argv++) {
2189                 char *arg = *argv;
2190
2191                 if (*arg == '-') {
2192                         if (!strcmp(arg, "--all")) {
2193                                 push_all = MATCH_REFS_ALL;
2194                                 continue;
2195                         }
2196                         if (!strcmp(arg, "--force")) {
2197                                 force_all = 1;
2198                                 continue;
2199                         }
2200                         if (!strcmp(arg, "--dry-run")) {
2201                                 dry_run = 1;
2202                                 continue;
2203                         }
2204                         if (!strcmp(arg, "--verbose")) {
2205                                 push_verbosely = 1;
2206                                 continue;
2207                         }
2208                         if (!strcmp(arg, "-d")) {
2209                                 delete_branch = 1;
2210                                 continue;
2211                         }
2212                         if (!strcmp(arg, "-D")) {
2213                                 delete_branch = 1;
2214                                 force_delete = 1;
2215                                 continue;
2216                         }
2217                 }
2218                 if (!remote->url) {
2219                         char *path = strstr(arg, "//");
2220                         remote->url = arg;
2221                         remote->path_len = strlen(arg);
2222                         if (path) {
2223                                 remote->path = strchr(path+2, '/');
2224                                 if (remote->path)
2225                                         remote->path_len = strlen(remote->path);
2226                         }
2227                         continue;
2228                 }
2229                 refspec = argv;
2230                 nr_refspec = argc - i;
2231                 break;
2232         }
2233
2234 #ifndef USE_CURL_MULTI
2235         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2236 #endif
2237
2238         if (!remote->url)
2239                 usage(http_push_usage);
2240
2241         if (delete_branch && nr_refspec != 1)
2242                 die("You must specify only one branch name when deleting a remote branch");
2243
2244         memset(remote_dir_exists, -1, 256);
2245
2246         http_init(NULL);
2247
2248         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2249
2250         if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2251                 rewritten_url = xmalloc(strlen(remote->url)+2);
2252                 strcpy(rewritten_url, remote->url);
2253                 strcat(rewritten_url, "/");
2254                 remote->path = rewritten_url + (remote->path - remote->url);
2255                 remote->path_len++;
2256                 remote->url = rewritten_url;
2257         }
2258
2259         /* Verify DAV compliance/lock support */
2260         if (!locking_available()) {
2261                 rc = 1;
2262                 goto cleanup;
2263         }
2264
2265         sigchain_push(SIGINT, remove_locks_on_signal);
2266         sigchain_push(SIGHUP, remove_locks_on_signal);
2267         sigchain_push(SIGQUIT, remove_locks_on_signal);
2268         sigchain_push(SIGTERM, remove_locks_on_signal);
2269
2270         /* Check whether the remote has server info files */
2271         remote->can_update_info_refs = 0;
2272         remote->has_info_refs = remote_exists("info/refs");
2273         remote->has_info_packs = remote_exists("objects/info/packs");
2274         if (remote->has_info_refs) {
2275                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2276                 if (info_ref_lock)
2277                         remote->can_update_info_refs = 1;
2278                 else {
2279                         fprintf(stderr, "Error: cannot lock existing info/refs\n");
2280                         rc = 1;
2281                         goto cleanup;
2282                 }
2283         }
2284         if (remote->has_info_packs)
2285                 fetch_indices();
2286
2287         /* Get a list of all local and remote heads to validate refspecs */
2288         get_local_heads();
2289         fprintf(stderr, "Fetching remote heads...\n");
2290         get_dav_remote_heads();
2291
2292         /* Remove a remote branch if -d or -D was specified */
2293         if (delete_branch) {
2294                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2295                         fprintf(stderr, "Unable to delete remote branch %s\n",
2296                                 refspec[0]);
2297                 goto cleanup;
2298         }
2299
2300         /* match them up */
2301         if (!remote_tail)
2302                 remote_tail = &remote_refs;
2303         if (match_refs(local_refs, remote_refs, &remote_tail,
2304                        nr_refspec, (const char **) refspec, push_all)) {
2305                 rc = -1;
2306                 goto cleanup;
2307         }
2308         if (!remote_refs) {
2309                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2310                 rc = 0;
2311                 goto cleanup;
2312         }
2313
2314         new_refs = 0;
2315         for (ref = remote_refs; ref; ref = ref->next) {
2316                 char old_hex[60], *new_hex;
2317                 const char *commit_argv[4];
2318                 int commit_argc;
2319                 char *new_sha1_hex, *old_sha1_hex;
2320
2321                 if (!ref->peer_ref)
2322                         continue;
2323
2324                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2325                         if (delete_remote_branch(ref->name, 1) == -1) {
2326                                 error("Could not remove %s", ref->name);
2327                                 rc = -4;
2328                         }
2329                         new_refs++;
2330                         continue;
2331                 }
2332
2333                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2334                         if (push_verbosely || 1)
2335                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2336                         continue;
2337                 }
2338
2339                 if (!force_all &&
2340                     !is_zero_sha1(ref->old_sha1) &&
2341                     !ref->force) {
2342                         if (!has_sha1_file(ref->old_sha1) ||
2343                             !ref_newer(ref->peer_ref->new_sha1,
2344                                        ref->old_sha1)) {
2345                                 /*
2346                                  * We do not have the remote ref, or
2347                                  * we know that the remote ref is not
2348                                  * an ancestor of what we are trying to
2349                                  * push.  Either way this can be losing
2350                                  * commits at the remote end and likely
2351                                  * we were not up to date to begin with.
2352                                  */
2353                                 error("remote '%s' is not an ancestor of\n"
2354                                       "local '%s'.\n"
2355                                       "Maybe you are not up-to-date and "
2356                                       "need to pull first?",
2357                                       ref->name,
2358                                       ref->peer_ref->name);
2359                                 rc = -2;
2360                                 continue;
2361                         }
2362                 }
2363                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2364                 new_refs++;
2365                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2366                 new_hex = sha1_to_hex(ref->new_sha1);
2367
2368                 fprintf(stderr, "updating '%s'", ref->name);
2369                 if (strcmp(ref->name, ref->peer_ref->name))
2370                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2371                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2372                 if (dry_run)
2373                         continue;
2374
2375                 /* Lock remote branch ref */
2376                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2377                 if (ref_lock == NULL) {
2378                         fprintf(stderr, "Unable to lock remote branch %s\n",
2379                                 ref->name);
2380                         rc = 1;
2381                         continue;
2382                 }
2383
2384                 /* Set up revision info for this refspec */
2385                 commit_argc = 3;
2386                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2387                 old_sha1_hex = NULL;
2388                 commit_argv[1] = "--objects";
2389                 commit_argv[2] = new_sha1_hex;
2390                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2391                         old_sha1_hex = xmalloc(42);
2392                         sprintf(old_sha1_hex, "^%s",
2393                                 sha1_to_hex(ref->old_sha1));
2394                         commit_argv[3] = old_sha1_hex;
2395                         commit_argc++;
2396                 }
2397                 init_revisions(&revs, setup_git_directory());
2398                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2399                 revs.edge_hint = 0; /* just in case */
2400                 free(new_sha1_hex);
2401                 if (old_sha1_hex) {
2402                         free(old_sha1_hex);
2403                         commit_argv[1] = NULL;
2404                 }
2405
2406                 /* Generate a list of objects that need to be pushed */
2407                 pushing = 0;
2408                 if (prepare_revision_walk(&revs))
2409                         die("revision walk setup failed");
2410                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2411                 objects_to_send = get_delta(&revs, ref_lock);
2412                 finish_all_active_slots();
2413
2414                 /* Push missing objects to remote, this would be a
2415                    convenient time to pack them first if appropriate. */
2416                 pushing = 1;
2417                 if (objects_to_send)
2418                         fprintf(stderr, "    sending %d objects\n",
2419                                 objects_to_send);
2420 #ifdef USE_CURL_MULTI
2421                 fill_active_slots();
2422                 add_fill_function(NULL, fill_active_slot);
2423 #endif
2424                 do {
2425                         finish_all_active_slots();
2426 #ifdef USE_CURL_MULTI
2427                         fill_active_slots();
2428 #endif
2429                 } while (request_queue_head && !aborted);
2430
2431                 /* Update the remote branch if all went well */
2432                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2433                         rc = 1;
2434
2435                 if (!rc)
2436                         fprintf(stderr, "    done\n");
2437                 unlock_remote(ref_lock);
2438                 check_locks();
2439         }
2440
2441         /* Update remote server info if appropriate */
2442         if (remote->has_info_refs && new_refs) {
2443                 if (info_ref_lock && remote->can_update_info_refs) {
2444                         fprintf(stderr, "Updating remote server info\n");
2445                         if (!dry_run)
2446                                 update_remote_info_refs(info_ref_lock);
2447                 } else {
2448                         fprintf(stderr, "Unable to update server info\n");
2449                 }
2450         }
2451
2452  cleanup:
2453         free(rewritten_url);
2454         if (info_ref_lock)
2455                 unlock_remote(info_ref_lock);
2456         free(remote);
2457
2458         curl_slist_free_all(no_pragma_header);
2459
2460         http_cleanup();
2461
2462         request = request_queue_head;
2463         while (request != NULL) {
2464                 next_request = request->next;
2465                 release_request(request);
2466                 request = next_request;
2467         }
2468
2469         return rc;
2470 }