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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5 #include "tag.h"
   6 #include "blob.h"
   7 #include "http.h"
   8 #include "refs.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "exec_cmd.h"
  12
  13 #include <expat.h>
  14
  15 static const char http_push_usage[] =
  16 "git-http-push [--all] [--force] [--verbose] <remote> [<head>...]\n";
  17
  18 #ifndef XML_STATUS_OK
  19 enum XML_Status {
  20   XML_STATUS_OK = 1,
  21   XML_STATUS_ERROR = 0
  22 };
  23 #define XML_STATUS_OK    1
  24 #define XML_STATUS_ERROR 0
  25 #endif
  26
  27 #define PREV_BUF_SIZE 4096
  28 #define RANGE_HEADER_SIZE 30
  29
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing = 0;
  74 static int aborted = 0;
  75 static signed char remote_dir_exists[256];
  76
  77 static struct curl_slist *no_pragma_header;
  78 static struct curl_slist *default_headers;
  79
  80 static int push_verbosely = 0;
  81 static int push_all = 0;
  82 static int force_all = 0;
  83
  84 static struct object_list *objects = NULL;
  85
  86 struct repo
  87 {
  88         char *url;
  89         int path_len;
  90         int has_info_refs;
  91         int can_update_info_refs;
  92         int has_info_packs;
  93         struct packed_git *packs;
  94         struct remote_lock *locks;
  95 };
  96
  97 static struct repo *remote = NULL;
  98
  99 enum transfer_state {
 100         NEED_FETCH,
 101         RUN_FETCH_LOOSE,
 102         RUN_FETCH_PACKED,
 103         NEED_PUSH,
 104         RUN_MKCOL,
 105         RUN_PUT,
 106         RUN_MOVE,
 107         ABORTED,
 108         COMPLETE,
 109 };
 110
 111 struct transfer_request
 112 {
 113         struct object *obj;
 114         char *url;
 115         char *dest;
 116         struct remote_lock *lock;
 117         struct curl_slist *headers;
 118         struct buffer buffer;
 119         char filename[PATH_MAX];
 120         char tmpfile[PATH_MAX];
 121         int local_fileno;
 122         FILE *local_stream;
 123         enum transfer_state state;
 124         CURLcode curl_result;
 125         char errorstr[CURL_ERROR_SIZE];
 126         long http_code;
 127         unsigned char real_sha1[20];
 128         SHA_CTX c;
 129         z_stream stream;
 130         int zret;
 131         int rename;
 132         void *userData;
 133         struct active_request_slot *slot;
 134         struct transfer_request *next;
 135 };
 136
 137 static struct transfer_request *request_queue_head = NULL;
 138
 139 struct xml_ctx
 140 {
 141         char *name;
 142         int len;
 143         char *cdata;
 144         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 145         void *userData;
 146 };
 147
 148 struct remote_lock
 149 {
 150         char *url;
 151         char *owner;
 152         char *token;
 153         time_t start_time;
 154         long timeout;
 155         int refreshing;
 156         struct remote_lock *next;
 157 };
 158
 159 /* Flags that control remote_ls processing */
 160 #define PROCESS_FILES (1u << 0)
 161 #define PROCESS_DIRS  (1u << 1)
 162 #define RECURSIVE     (1u << 2)
 163
 164 /* Flags that remote_ls passes to callback functions */
 165 #define IS_DIR (1u << 0)
 166
 167 struct remote_ls_ctx
 168 {
 169         char *path;
 170         void (*userFunc)(struct remote_ls_ctx *ls);
 171         void *userData;
 172         int flags;
 173         char *dentry_name;
 174         int dentry_flags;
 175         struct remote_ls_ctx *parent;
 176 };
 177
 178 static void finish_request(struct transfer_request *request);
 179 static void release_request(struct transfer_request *request);
 180
 181 static void process_response(void *callback_data)
 182 {
 183         struct transfer_request *request =
 184                 (struct transfer_request *)callback_data;
 185
 186         finish_request(request);
 187 }
 188
 189 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 190                                void *data)
 191 {
 192         unsigned char expn[4096];
 193         size_t size = eltsize * nmemb;
 194         int posn = 0;
 195         struct transfer_request *request = (struct transfer_request *)data;
 196         do {
 197                 ssize_t retval = write(request->local_fileno,
 198                                        ptr + posn, size - posn);
 199                 if (retval < 0)
 200                         return posn;
 201                 posn += retval;
 202         } while (posn < size);
 203
 204         request->stream.avail_in = size;
 205         request->stream.next_in = ptr;
 206         do {
 207                 request->stream.next_out = expn;
 208                 request->stream.avail_out = sizeof(expn);
 209                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 210                 SHA1_Update(&request->c, expn,
 211                             sizeof(expn) - request->stream.avail_out);
 212         } while (request->stream.avail_in && request->zret == Z_OK);
 213         data_received++;
 214         return size;
 215 }
 216
 217 static void start_fetch_loose(struct transfer_request *request)
 218 {
 219         char *hex = sha1_to_hex(request->obj->sha1);
 220         char *filename;
 221         char prevfile[PATH_MAX];
 222         char *url;
 223         char *posn;
 224         int prevlocal;
 225         unsigned char prev_buf[PREV_BUF_SIZE];
 226         ssize_t prev_read = 0;
 227         long prev_posn = 0;
 228         char range[RANGE_HEADER_SIZE];
 229         struct curl_slist *range_header = NULL;
 230         struct active_request_slot *slot;
 231
 232         filename = sha1_file_name(request->obj->sha1);
 233         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 234         snprintf(request->tmpfile, sizeof(request->tmpfile),
 235                  "%s.temp", filename);
 236
 237         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 238         unlink(prevfile);
 239         rename(request->tmpfile, prevfile);
 240         unlink(request->tmpfile);
 241
 242         if (request->local_fileno != -1)
 243                 error("fd leakage in start: %d", request->local_fileno);
 244         request->local_fileno = open(request->tmpfile,
 245                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 246         /* This could have failed due to the "lazy directory creation";
 247          * try to mkdir the last path component.
 248          */
 249         if (request->local_fileno < 0 && errno == ENOENT) {
 250                 char *dir = strrchr(request->tmpfile, '/');
 251                 if (dir) {
 252                         *dir = 0;
 253                         mkdir(request->tmpfile, 0777);
 254                         *dir = '/';
 255                 }
 256                 request->local_fileno = open(request->tmpfile,
 257                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 258         }
 259
 260         if (request->local_fileno < 0) {
 261                 request->state = ABORTED;
 262                 error("Couldn't create temporary file %s for %s: %s",
 263                       request->tmpfile, request->filename, strerror(errno));
 264                 return;
 265         }
 266
 267         memset(&request->stream, 0, sizeof(request->stream));
 268
 269         inflateInit(&request->stream);
 270
 271         SHA1_Init(&request->c);
 272
 273         url = xmalloc(strlen(remote->url) + 50);
 274         request->url = xmalloc(strlen(remote->url) + 50);
 275         strcpy(url, remote->url);
 276         posn = url + strlen(remote->url);
 277         strcpy(posn, "objects/");
 278         posn += 8;
 279         memcpy(posn, hex, 2);
 280         posn += 2;
 281         *(posn++) = '/';
 282         strcpy(posn, hex + 2);
 283         strcpy(request->url, url);
 284
 285         /* If a previous temp file is present, process what was already
 286            fetched. */
 287         prevlocal = open(prevfile, O_RDONLY);
 288         if (prevlocal != -1) {
 289                 do {
 290                         prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
 291                         if (prev_read>0) {
 292                                 if (fwrite_sha1_file(prev_buf,
 293                                                      1,
 294                                                      prev_read,
 295                                                      request) == prev_read) {
 296                                         prev_posn += prev_read;
 297                                 } else {
 298                                         prev_read = -1;
 299                                 }
 300                         }
 301                 } while (prev_read > 0);
 302                 close(prevlocal);
 303         }
 304         unlink(prevfile);
 305
 306         /* Reset inflate/SHA1 if there was an error reading the previous temp
 307            file; also rewind to the beginning of the local file. */
 308         if (prev_read == -1) {
 309                 memset(&request->stream, 0, sizeof(request->stream));
 310                 inflateInit(&request->stream);
 311                 SHA1_Init(&request->c);
 312                 if (prev_posn>0) {
 313                         prev_posn = 0;
 314                         lseek(request->local_fileno, SEEK_SET, 0);
 315                         ftruncate(request->local_fileno, 0);
 316                 }
 317         }
 318
 319         slot = get_active_slot();
 320         slot->callback_func = process_response;
 321         slot->callback_data = request;
 322         request->slot = slot;
 323
 324         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 325         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 326         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 327         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 328         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 329
 330         /* If we have successfully processed data from a previous fetch
 331            attempt, only fetch the data we don't already have. */
 332         if (prev_posn>0) {
 333                 if (push_verbosely)
 334                         fprintf(stderr,
 335                                 "Resuming fetch of object %s at byte %ld\n",
 336                                 hex, prev_posn);
 337                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 338                 range_header = curl_slist_append(range_header, range);
 339                 curl_easy_setopt(slot->curl,
 340                                  CURLOPT_HTTPHEADER, range_header);
 341         }
 342
 343         /* Try to get the request started, abort the request on error */
 344         request->state = RUN_FETCH_LOOSE;
 345         if (!start_active_slot(slot)) {
 346                 fprintf(stderr, "Unable to start GET request\n");
 347                 remote->can_update_info_refs = 0;
 348                 release_request(request);
 349         }
 350 }
 351
 352 static void start_fetch_packed(struct transfer_request *request)
 353 {
 354         char *url;
 355         struct packed_git *target;
 356         FILE *packfile;
 357         char *filename;
 358         long prev_posn = 0;
 359         char range[RANGE_HEADER_SIZE];
 360         struct curl_slist *range_header = NULL;
 361
 362         struct transfer_request *check_request = request_queue_head;
 363         struct active_request_slot *slot;
 364
 365         target = find_sha1_pack(request->obj->sha1, remote->packs);
 366         if (!target) {
 367                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 368                 remote->can_update_info_refs = 0;
 369                 release_request(request);
 370                 return;
 371         }
 372
 373         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 374         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 375
 376         filename = sha1_pack_name(target->sha1);
 377         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 378         snprintf(request->tmpfile, sizeof(request->tmpfile),
 379                  "%s.temp", filename);
 380
 381         url = xmalloc(strlen(remote->url) + 64);
 382         sprintf(url, "%sobjects/pack/pack-%s.pack",
 383                 remote->url, sha1_to_hex(target->sha1));
 384
 385         /* Make sure there isn't another open request for this pack */
 386         while (check_request) {
 387                 if (check_request->state == RUN_FETCH_PACKED &&
 388                     !strcmp(check_request->url, url)) {
 389                         free(url);
 390                         release_request(request);
 391                         return;
 392                 }
 393                 check_request = check_request->next;
 394         }
 395
 396         packfile = fopen(request->tmpfile, "a");
 397         if (!packfile) {
 398                 fprintf(stderr, "Unable to open local file %s for pack",
 399                         filename);
 400                 remote->can_update_info_refs = 0;
 401                 free(url);
 402                 return;
 403         }
 404
 405         slot = get_active_slot();
 406         slot->callback_func = process_response;
 407         slot->callback_data = request;
 408         request->slot = slot;
 409         request->local_stream = packfile;
 410         request->userData = target;
 411
 412         request->url = url;
 413         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 414         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 415         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 416         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 417         slot->local = packfile;
 418
 419         /* If there is data present from a previous transfer attempt,
 420            resume where it left off */
 421         prev_posn = ftell(packfile);
 422         if (prev_posn>0) {
 423                 if (push_verbosely)
 424                         fprintf(stderr,
 425                                 "Resuming fetch of pack %s at byte %ld\n",
 426                                 sha1_to_hex(target->sha1), prev_posn);
 427                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 428                 range_header = curl_slist_append(range_header, range);
 429                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 430         }
 431
 432         /* Try to get the request started, abort the request on error */
 433         request->state = RUN_FETCH_PACKED;
 434         if (!start_active_slot(slot)) {
 435                 fprintf(stderr, "Unable to start GET request\n");
 436                 remote->can_update_info_refs = 0;
 437                 release_request(request);
 438         }
 439 }
 440
 441 static void start_mkcol(struct transfer_request *request)
 442 {
 443         char *hex = sha1_to_hex(request->obj->sha1);
 444         struct active_request_slot *slot;
 445         char *posn;
 446
 447         request->url = xmalloc(strlen(remote->url) + 13);
 448         strcpy(request->url, remote->url);
 449         posn = request->url + strlen(remote->url);
 450         strcpy(posn, "objects/");
 451         posn += 8;
 452         memcpy(posn, hex, 2);
 453         posn += 2;
 454         strcpy(posn, "/");
 455
 456         slot = get_active_slot();
 457         slot->callback_func = process_response;
 458         slot->callback_data = request;
 459         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 460         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 461         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 462         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 463         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 464
 465         if (start_active_slot(slot)) {
 466                 request->slot = slot;
 467                 request->state = RUN_MKCOL;
 468         } else {
 469                 request->state = ABORTED;
 470                 free(request->url);
 471                 request->url = NULL;
 472         }
 473 }
 474
 475 static void start_put(struct transfer_request *request)
 476 {
 477         char *hex = sha1_to_hex(request->obj->sha1);
 478         struct active_request_slot *slot;
 479         char *posn;
 480         char type[20];
 481         char hdr[50];
 482         void *unpacked;
 483         unsigned long len;
 484         int hdrlen;
 485         ssize_t size;
 486         z_stream stream;
 487
 488         unpacked = read_sha1_file(request->obj->sha1, type, &len);
 489         hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 490
 491         /* Set it up */
 492         memset(&stream, 0, sizeof(stream));
 493         deflateInit(&stream, Z_BEST_COMPRESSION);
 494         size = deflateBound(&stream, len + hdrlen);
 495         request->buffer.buffer = xmalloc(size);
 496
 497         /* Compress it */
 498         stream.next_out = request->buffer.buffer;
 499         stream.avail_out = size;
 500
 501         /* First header.. */
 502         stream.next_in = (void *)hdr;
 503         stream.avail_in = hdrlen;
 504         while (deflate(&stream, 0) == Z_OK)
 505                 /* nothing */;
 506
 507         /* Then the data itself.. */
 508         stream.next_in = unpacked;
 509         stream.avail_in = len;
 510         while (deflate(&stream, Z_FINISH) == Z_OK)
 511                 /* nothing */;
 512         deflateEnd(&stream);
 513         free(unpacked);
 514
 515         request->buffer.size = stream.total_out;
 516         request->buffer.posn = 0;
 517
 518         request->url = xmalloc(strlen(remote->url) +
 519                                strlen(request->lock->token) + 51);
 520         strcpy(request->url, remote->url);
 521         posn = request->url + strlen(remote->url);
 522         strcpy(posn, "objects/");
 523         posn += 8;
 524         memcpy(posn, hex, 2);
 525         posn += 2;
 526         *(posn++) = '/';
 527         strcpy(posn, hex + 2);
 528         request->dest = xmalloc(strlen(request->url) + 14);
 529         sprintf(request->dest, "Destination: %s", request->url);
 530         posn += 38;
 531         *(posn++) = '.';
 532         strcpy(posn, request->lock->token);
 533
 534         slot = get_active_slot();
 535         slot->callback_func = process_response;
 536         slot->callback_data = request;
 537         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 538         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 539         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 540         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 541         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 542         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 543         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 544         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 545         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 546
 547         if (start_active_slot(slot)) {
 548                 request->slot = slot;
 549                 request->state = RUN_PUT;
 550         } else {
 551                 request->state = ABORTED;
 552                 free(request->url);
 553                 request->url = NULL;
 554         }
 555 }
 556
 557 static void start_move(struct transfer_request *request)
 558 {
 559         struct active_request_slot *slot;
 560         struct curl_slist *dav_headers = NULL;
 561
 562         slot = get_active_slot();
 563         slot->callback_func = process_response;
 564         slot->callback_data = request;
 565         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 566         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 567         dav_headers = curl_slist_append(dav_headers, request->dest);
 568         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 569         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 571         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 572
 573         if (start_active_slot(slot)) {
 574                 request->slot = slot;
 575                 request->state = RUN_MOVE;
 576         } else {
 577                 request->state = ABORTED;
 578                 free(request->url);
 579                 request->url = NULL;
 580         }
 581 }
 582
 583 static int refresh_lock(struct remote_lock *lock)
 584 {
 585         struct active_request_slot *slot;
 586         struct slot_results results;
 587         char *if_header;
 588         char timeout_header[25];
 589         struct curl_slist *dav_headers = NULL;
 590         int rc = 0;
 591
 592         lock->refreshing = 1;
 593
 594         if_header = xmalloc(strlen(lock->token) + 25);
 595         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 596         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 597         dav_headers = curl_slist_append(dav_headers, if_header);
 598         dav_headers = curl_slist_append(dav_headers, timeout_header);
 599
 600         slot = get_active_slot();
 601         slot->results = &results;
 602         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 603         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 604         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 605         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 606         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 607
 608         if (start_active_slot(slot)) {
 609                 run_active_slot(slot);
 610                 if (results.curl_result != CURLE_OK) {
 611                         fprintf(stderr, "LOCK HTTP error %ld\n",
 612                                 results.http_code);
 613                 } else {
 614                         lock->start_time = time(NULL);
 615                         rc = 1;
 616                 }
 617         }
 618
 619         lock->refreshing = 0;
 620         curl_slist_free_all(dav_headers);
 621         free(if_header);
 622
 623         return rc;
 624 }
 625
 626 static void check_locks(void)
 627 {
 628         struct remote_lock *lock = remote->locks;
 629         time_t current_time = time(NULL);
 630         int time_remaining;
 631
 632         while (lock) {
 633                 time_remaining = lock->start_time + lock->timeout -
 634                         current_time;
 635                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 636                         if (!refresh_lock(lock)) {
 637                                 fprintf(stderr,
 638                                         "Unable to refresh lock for %s\n",
 639                                         lock->url);
 640                                 aborted = 1;
 641                                 return;
 642                         }
 643                 }
 644                 lock = lock->next;
 645         }
 646 }
 647
 648 static void release_request(struct transfer_request *request)
 649 {
 650         struct transfer_request *entry = request_queue_head;
 651
 652         if (request == request_queue_head) {
 653                 request_queue_head = request->next;
 654         } else {
 655                 while (entry->next != NULL && entry->next != request)
 656                         entry = entry->next;
 657                 if (entry->next == request)
 658                         entry->next = entry->next->next;
 659         }
 660
 661         if (request->local_fileno != -1)
 662                 close(request->local_fileno);
 663         if (request->local_stream)
 664                 fclose(request->local_stream);
 665         if (request->url != NULL)
 666                 free(request->url);
 667         free(request);
 668 }
 669
 670 static void finish_request(struct transfer_request *request)
 671 {
 672         struct stat st;
 673         struct packed_git *target;
 674         struct packed_git **lst;
 675
 676         request->curl_result = request->slot->curl_result;
 677         request->http_code = request->slot->http_code;
 678         request->slot = NULL;
 679
 680         /* Keep locks active */
 681         check_locks();
 682
 683         if (request->headers != NULL)
 684                 curl_slist_free_all(request->headers);
 685
 686         /* URL is reused for MOVE after PUT */
 687         if (request->state != RUN_PUT) {
 688                 free(request->url);
 689                 request->url = NULL;
 690         }
 691
 692         if (request->state == RUN_MKCOL) {
 693                 if (request->curl_result == CURLE_OK ||
 694                     request->http_code == 405) {
 695                         remote_dir_exists[request->obj->sha1[0]] = 1;
 696                         start_put(request);
 697                 } else {
 698                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 699                                 sha1_to_hex(request->obj->sha1),
 700                                 request->curl_result, request->http_code);
 701                         request->state = ABORTED;
 702                         aborted = 1;
 703                 }
 704         } else if (request->state == RUN_PUT) {
 705                 if (request->curl_result == CURLE_OK) {
 706                         start_move(request);
 707                 } else {
 708                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 709                                 sha1_to_hex(request->obj->sha1),
 710                                 request->curl_result, request->http_code);
 711                         request->state = ABORTED;
 712                         aborted = 1;
 713                 }
 714         } else if (request->state == RUN_MOVE) {
 715                 if (request->curl_result == CURLE_OK) {
 716                         if (push_verbosely)
 717                                 fprintf(stderr, "    sent %s\n",
 718                                         sha1_to_hex(request->obj->sha1));
 719                         request->obj->flags |= REMOTE;
 720                         release_request(request);
 721                 } else {
 722                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 723                                 sha1_to_hex(request->obj->sha1),
 724                                 request->curl_result, request->http_code);
 725                         request->state = ABORTED;
 726                         aborted = 1;
 727                 }
 728         } else if (request->state == RUN_FETCH_LOOSE) {
 729                 fchmod(request->local_fileno, 0444);
 730                 close(request->local_fileno); request->local_fileno = -1;
 731
 732                 if (request->curl_result != CURLE_OK &&
 733                     request->http_code != 416) {
 734                         if (stat(request->tmpfile, &st) == 0) {
 735                                 if (st.st_size == 0)
 736                                         unlink(request->tmpfile);
 737                         }
 738                 } else {
 739                         if (request->http_code == 416)
 740                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 741
 742                         inflateEnd(&request->stream);
 743                         SHA1_Final(request->real_sha1, &request->c);
 744                         if (request->zret != Z_STREAM_END) {
 745                                 unlink(request->tmpfile);
 746                         } else if (memcmp(request->obj->sha1, request->real_sha1, 20)) {
 747                                 unlink(request->tmpfile);
 748                         } else {
 749                                 request->rename =
 750                                         move_temp_to_file(
 751                                                 request->tmpfile,
 752                                                 request->filename);
 753                                 if (request->rename == 0) {
 754                                         request->obj->flags |= (LOCAL | REMOTE);
 755                                 }
 756                         }
 757                 }
 758
 759                 /* Try fetching packed if necessary */
 760                 if (request->obj->flags & LOCAL)
 761                         release_request(request);
 762                 else
 763                         start_fetch_packed(request);
 764
 765         } else if (request->state == RUN_FETCH_PACKED) {
 766                 if (request->curl_result != CURLE_OK) {
 767                         fprintf(stderr, "Unable to get pack file %s\n%s",
 768                                 request->url, curl_errorstr);
 769                         remote->can_update_info_refs = 0;
 770                 } else {
 771                         fclose(request->local_stream);
 772                         request->local_stream = NULL;
 773                         if (!move_temp_to_file(request->tmpfile,
 774                                                request->filename)) {
 775                                 target = (struct packed_git *)request->userData;
 776                                 lst = &remote->packs;
 777                                 while (*lst != target)
 778                                         lst = &((*lst)->next);
 779                                 *lst = (*lst)->next;
 780
 781                                 if (!verify_pack(target, 0))
 782                                         install_packed_git(target);
 783                                 else
 784                                         remote->can_update_info_refs = 0;
 785                         }
 786                 }
 787                 release_request(request);
 788         }
 789 }
 790
 791 void fill_active_slots(void)
 792 {
 793         struct transfer_request *request = request_queue_head;
 794         struct transfer_request *next;
 795         struct active_request_slot *slot = active_queue_head;
 796         int num_transfers;
 797
 798         if (aborted)
 799                 return;
 800
 801         while (active_requests < max_requests && request != NULL) {
 802                 next = request->next;
 803                 if (request->state == NEED_FETCH) {
 804                         start_fetch_loose(request);
 805                 } else if (pushing && request->state == NEED_PUSH) {
 806                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 807                                 start_put(request);
 808                         } else {
 809                                 start_mkcol(request);
 810                         }
 811                         curl_multi_perform(curlm, &num_transfers);
 812                 }
 813                 request = next;
 814         }
 815
 816         while (slot != NULL) {
 817                 if (!slot->in_use && slot->curl != NULL) {
 818                         curl_easy_cleanup(slot->curl);
 819                         slot->curl = NULL;
 820                 }
 821                 slot = slot->next;
 822         }
 823 }
 824
 825 static void get_remote_object_list(unsigned char parent);
 826
 827 static void add_fetch_request(struct object *obj)
 828 {
 829         struct transfer_request *request;
 830
 831         check_locks();
 832
 833         /*
 834          * Don't fetch the object if it's known to exist locally
 835          * or is already in the request queue
 836          */
 837         if (remote_dir_exists[obj->sha1[0]] == -1)
 838                 get_remote_object_list(obj->sha1[0]);
 839         if (obj->flags & (LOCAL | FETCHING))
 840                 return;
 841
 842         obj->flags |= FETCHING;
 843         request = xmalloc(sizeof(*request));
 844         request->obj = obj;
 845         request->url = NULL;
 846         request->lock = NULL;
 847         request->headers = NULL;
 848         request->local_fileno = -1;
 849         request->local_stream = NULL;
 850         request->state = NEED_FETCH;
 851         request->next = request_queue_head;
 852         request_queue_head = request;
 853
 854         fill_active_slots();
 855         step_active_slots();
 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         fill_active_slots();
 893         step_active_slots();
 894
 895         return 1;
 896 }
 897
 898 static int fetch_index(unsigned char *sha1)
 899 {
 900         char *hex = sha1_to_hex(sha1);
 901         char *filename;
 902         char *url;
 903         char tmpfile[PATH_MAX];
 904         long prev_posn = 0;
 905         char range[RANGE_HEADER_SIZE];
 906         struct curl_slist *range_header = NULL;
 907
 908         FILE *indexfile;
 909         struct active_request_slot *slot;
 910         struct slot_results results;
 911
 912         /* Don't use the index if the pack isn't there */
 913         url = xmalloc(strlen(remote->url) + 64);
 914         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 915         slot = get_active_slot();
 916         slot->results = &results;
 917         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 918         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 919         if (start_active_slot(slot)) {
 920                 run_active_slot(slot);
 921                 if (results.curl_result != CURLE_OK) {
 922                         free(url);
 923                         return error("Unable to verify pack %s is available",
 924                                      hex);
 925                 }
 926         } else {
 927                 return error("Unable to start request");
 928         }
 929
 930         if (has_pack_index(sha1))
 931                 return 0;
 932
 933         if (push_verbosely)
 934                 fprintf(stderr, "Getting index for pack %s\n", hex);
 935
 936         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 937
 938         filename = sha1_pack_index_name(sha1);
 939         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 940         indexfile = fopen(tmpfile, "a");
 941         if (!indexfile)
 942                 return error("Unable to open local file %s for pack index",
 943                              filename);
 944
 945         slot = get_active_slot();
 946         slot->results = &results;
 947         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 948         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 949         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 950         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 951         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 952         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 953         slot->local = indexfile;
 954
 955         /* If there is data present from a previous transfer attempt,
 956            resume where it left off */
 957         prev_posn = ftell(indexfile);
 958         if (prev_posn>0) {
 959                 if (push_verbosely)
 960                         fprintf(stderr,
 961                                 "Resuming fetch of index for pack %s at byte %ld\n",
 962                                 hex, prev_posn);
 963                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 964                 range_header = curl_slist_append(range_header, range);
 965                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 966         }
 967
 968         if (start_active_slot(slot)) {
 969                 run_active_slot(slot);
 970                 if (results.curl_result != CURLE_OK) {
 971                         free(url);
 972                         fclose(indexfile);
 973                         return error("Unable to get pack index %s\n%s", url,
 974                                      curl_errorstr);
 975                 }
 976         } else {
 977                 free(url);
 978                 fclose(indexfile);
 979                 return error("Unable to start request");
 980         }
 981
 982         free(url);
 983         fclose(indexfile);
 984
 985         return move_temp_to_file(tmpfile, filename);
 986 }
 987
 988 static int setup_index(unsigned char *sha1)
 989 {
 990         struct packed_git *new_pack;
 991
 992         if (fetch_index(sha1))
 993                 return -1;
 994
 995         new_pack = parse_pack_index(sha1);
 996         new_pack->next = remote->packs;
 997         remote->packs = new_pack;
 998         return 0;
 999 }
1000
1001 static int fetch_indices(void)
1002 {
1003         unsigned char sha1[20];
1004         char *url;
1005         struct buffer buffer;
1006         char *data;
1007         int i = 0;
1008
1009         struct active_request_slot *slot;
1010         struct slot_results results;
1011
1012         data = xcalloc(1, 4096);
1013         buffer.size = 4096;
1014         buffer.posn = 0;
1015         buffer.buffer = data;
1016
1017         if (push_verbosely)
1018                 fprintf(stderr, "Getting pack list\n");
1019
1020         url = xmalloc(strlen(remote->url) + 20);
1021         sprintf(url, "%sobjects/info/packs", remote->url);
1022
1023         slot = get_active_slot();
1024         slot->results = &results;
1025         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1026         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1028         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1029         if (start_active_slot(slot)) {
1030                 run_active_slot(slot);
1031                 if (results.curl_result != CURLE_OK) {
1032                         free(buffer.buffer);
1033                         free(url);
1034                         if (results.http_code == 404)
1035                                 return 0;
1036                         else
1037                                 return error("%s", curl_errorstr);
1038                 }
1039         } else {
1040                 free(buffer.buffer);
1041                 free(url);
1042                 return error("Unable to start request");
1043         }
1044         free(url);
1045
1046         data = buffer.buffer;
1047         while (i < buffer.posn) {
1048                 switch (data[i]) {
1049                 case 'P':
1050                         i++;
1051                         if (i + 52 < buffer.posn &&
1052                             !strncmp(data + i, " pack-", 6) &&
1053                             !strncmp(data + i + 46, ".pack\n", 6)) {
1054                                 get_sha1_hex(data + i + 6, sha1);
1055                                 setup_index(sha1);
1056                                 i += 51;
1057                                 break;
1058                         }
1059                 default:
1060                         while (data[i] != '\n')
1061                                 i++;
1062                 }
1063                 i++;
1064         }
1065
1066         free(buffer.buffer);
1067         return 0;
1068 }
1069
1070 static inline int needs_quote(int ch)
1071 {
1072         switch (ch) {
1073         case '/': case '-': case '.':
1074         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1075                 return 0;
1076         default:
1077                 return 1;
1078         }
1079 }
1080
1081 static inline int hex(int v)
1082 {
1083         if (v < 10) return '0' + v;
1084         else return 'A' + v - 10;
1085 }
1086
1087 static char *quote_ref_url(const char *base, const char *ref)
1088 {
1089         const char *cp;
1090         char *dp, *qref;
1091         int len, baselen, ch;
1092
1093         baselen = strlen(base);
1094         len = baselen + 1;
1095         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1096                 if (needs_quote(ch))
1097                         len += 2; /* extra two hex plus replacement % */
1098         qref = xmalloc(len);
1099         memcpy(qref, base, baselen);
1100         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1101                 if (needs_quote(ch)) {
1102                         *dp++ = '%';
1103                         *dp++ = hex((ch >> 4) & 0xF);
1104                         *dp++ = hex(ch & 0xF);
1105                 }
1106                 else
1107                         *dp++ = ch;
1108         }
1109         *dp = 0;
1110
1111         return qref;
1112 }
1113
1114 int fetch_ref(char *ref, unsigned char *sha1)
1115 {
1116         char *url;
1117         char hex[42];
1118         struct buffer buffer;
1119         char *base = remote->url;
1120         struct active_request_slot *slot;
1121         struct slot_results results;
1122         buffer.size = 41;
1123         buffer.posn = 0;
1124         buffer.buffer = hex;
1125         hex[41] = '\0';
1126
1127         url = quote_ref_url(base, ref);
1128         slot = get_active_slot();
1129         slot->results = &results;
1130         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1131         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1132         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1133         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1134         if (start_active_slot(slot)) {
1135                 run_active_slot(slot);
1136                 if (results.curl_result != CURLE_OK)
1137                         return error("Couldn't get %s for %s\n%s",
1138                                      url, ref, curl_errorstr);
1139         } else {
1140                 return error("Unable to start request");
1141         }
1142
1143         hex[40] = '\0';
1144         get_sha1_hex(hex, sha1);
1145         return 0;
1146 }
1147
1148 static void one_remote_object(const char *hex)
1149 {
1150         unsigned char sha1[20];
1151         struct object *obj;
1152
1153         if (get_sha1_hex(hex, sha1) != 0)
1154                 return;
1155
1156         obj = lookup_object(sha1);
1157         if (!obj)
1158                 obj = parse_object(sha1);
1159
1160         /* Ignore remote objects that don't exist locally */
1161         if (!obj)
1162                 return;
1163
1164         obj->flags |= REMOTE;
1165         if (!object_list_contains(objects, obj))
1166                 add_object(obj, &objects, NULL, "");
1167 }
1168
1169 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1170 {
1171         int *lock_flags = (int *)ctx->userData;
1172
1173         if (tag_closed) {
1174                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1175                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1176                             (*lock_flags & DAV_PROP_LOCKWR)) {
1177                                 *lock_flags |= DAV_LOCK_OK;
1178                         }
1179                         *lock_flags &= DAV_LOCK_OK;
1180                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1181                         *lock_flags |= DAV_PROP_LOCKWR;
1182                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1183                         *lock_flags |= DAV_PROP_LOCKEX;
1184                 }
1185         }
1186 }
1187
1188 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1189 {
1190         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1191
1192         if (tag_closed && ctx->cdata) {
1193                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1194                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1195                         strcpy(lock->owner, ctx->cdata);
1196                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1197                         if (!strncmp(ctx->cdata, "Second-", 7))
1198                                 lock->timeout =
1199                                         strtol(ctx->cdata + 7, NULL, 10);
1200                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1201                         if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
1202                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1203                                 strcpy(lock->token, ctx->cdata + 16);
1204                         }
1205                 }
1206         }
1207 }
1208
1209 static void one_remote_ref(char *refname);
1210
1211 static void
1212 xml_start_tag(void *userData, const char *name, const char **atts)
1213 {
1214         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1215         const char *c = strchr(name, ':');
1216         int new_len;
1217
1218         if (c == NULL)
1219                 c = name;
1220         else
1221                 c++;
1222
1223         new_len = strlen(ctx->name) + strlen(c) + 2;
1224
1225         if (new_len > ctx->len) {
1226                 ctx->name = xrealloc(ctx->name, new_len);
1227                 ctx->len = new_len;
1228         }
1229         strcat(ctx->name, ".");
1230         strcat(ctx->name, c);
1231
1232         if (ctx->cdata) {
1233                 free(ctx->cdata);
1234                 ctx->cdata = NULL;
1235         }
1236
1237         ctx->userFunc(ctx, 0);
1238 }
1239
1240 static void
1241 xml_end_tag(void *userData, const char *name)
1242 {
1243         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1244         const char *c = strchr(name, ':');
1245         char *ep;
1246
1247         ctx->userFunc(ctx, 1);
1248
1249         if (c == NULL)
1250                 c = name;
1251         else
1252                 c++;
1253
1254         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1255         *ep = 0;
1256 }
1257
1258 static void
1259 xml_cdata(void *userData, const XML_Char *s, int len)
1260 {
1261         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1262         if (ctx->cdata)
1263                 free(ctx->cdata);
1264         ctx->cdata = xcalloc(len+1, 1);
1265         strncpy(ctx->cdata, s, len);
1266 }
1267
1268 static struct remote_lock *lock_remote(char *path, long timeout)
1269 {
1270         struct active_request_slot *slot;
1271         struct slot_results results;
1272         struct buffer out_buffer;
1273         struct buffer in_buffer;
1274         char *out_data;
1275         char *in_data;
1276         char *url;
1277         char *ep;
1278         char timeout_header[25];
1279         struct remote_lock *lock = NULL;
1280         XML_Parser parser = XML_ParserCreate(NULL);
1281         enum XML_Status result;
1282         struct curl_slist *dav_headers = NULL;
1283         struct xml_ctx ctx;
1284
1285         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1286         sprintf(url, "%s%s", remote->url, path);
1287
1288         /* Make sure leading directories exist for the remote ref */
1289         ep = strchr(url + strlen(remote->url) + 11, '/');
1290         while (ep) {
1291                 *ep = 0;
1292                 slot = get_active_slot();
1293                 slot->results = &results;
1294                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1295                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1296                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1297                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1298                 if (start_active_slot(slot)) {
1299                         run_active_slot(slot);
1300                         if (results.curl_result != CURLE_OK &&
1301                             results.http_code != 405) {
1302                                 fprintf(stderr,
1303                                         "Unable to create branch path %s\n",
1304                                         url);
1305                                 free(url);
1306                                 return NULL;
1307                         }
1308                 } else {
1309                         fprintf(stderr, "Unable to start MKCOL request\n");
1310                         free(url);
1311                         return NULL;
1312                 }
1313                 *ep = '/';
1314                 ep = strchr(ep + 1, '/');
1315         }
1316
1317         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1318         out_data = xmalloc(out_buffer.size + 1);
1319         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1320         out_buffer.posn = 0;
1321         out_buffer.buffer = out_data;
1322
1323         in_buffer.size = 4096;
1324         in_data = xmalloc(in_buffer.size);
1325         in_buffer.posn = 0;
1326         in_buffer.buffer = in_data;
1327
1328         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1329         dav_headers = curl_slist_append(dav_headers, timeout_header);
1330         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1331
1332         slot = get_active_slot();
1333         slot->results = &results;
1334         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1335         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1336         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1337         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1338         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1339         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1340         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1341         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1342         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1343
1344         lock = xcalloc(1, sizeof(*lock));
1345         lock->timeout = -1;
1346
1347         if (start_active_slot(slot)) {
1348                 run_active_slot(slot);
1349                 if (results.curl_result == CURLE_OK) {
1350                         ctx.name = xcalloc(10, 1);
1351                         ctx.len = 0;
1352                         ctx.cdata = NULL;
1353                         ctx.userFunc = handle_new_lock_ctx;
1354                         ctx.userData = lock;
1355                         XML_SetUserData(parser, &ctx);
1356                         XML_SetElementHandler(parser, xml_start_tag,
1357                                               xml_end_tag);
1358                         XML_SetCharacterDataHandler(parser, xml_cdata);
1359                         result = XML_Parse(parser, in_buffer.buffer,
1360                                            in_buffer.posn, 1);
1361                         free(ctx.name);
1362                         if (result != XML_STATUS_OK) {
1363                                 fprintf(stderr, "XML error: %s\n",
1364                                         XML_ErrorString(
1365                                                 XML_GetErrorCode(parser)));
1366                                 lock->timeout = -1;
1367                         }
1368                 }
1369         } else {
1370                 fprintf(stderr, "Unable to start LOCK request\n");
1371         }
1372
1373         curl_slist_free_all(dav_headers);
1374         free(out_data);
1375         free(in_data);
1376
1377         if (lock->token == NULL || lock->timeout <= 0) {
1378                 if (lock->token != NULL)
1379                         free(lock->token);
1380                 if (lock->owner != NULL)
1381                         free(lock->owner);
1382                 free(url);
1383                 free(lock);
1384                 lock = NULL;
1385         } else {
1386                 lock->url = url;
1387                 lock->start_time = time(NULL);
1388                 lock->next = remote->locks;
1389                 remote->locks = lock;
1390         }
1391
1392         return lock;
1393 }
1394
1395 static int unlock_remote(struct remote_lock *lock)
1396 {
1397         struct active_request_slot *slot;
1398         struct slot_results results;
1399         struct remote_lock *prev = remote->locks;
1400         char *lock_token_header;
1401         struct curl_slist *dav_headers = NULL;
1402         int rc = 0;
1403
1404         lock_token_header = xmalloc(strlen(lock->token) + 31);
1405         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1406                 lock->token);
1407         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1408
1409         slot = get_active_slot();
1410         slot->results = &results;
1411         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1412         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1413         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1414         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1415
1416         if (start_active_slot(slot)) {
1417                 run_active_slot(slot);
1418                 if (results.curl_result == CURLE_OK)
1419                         rc = 1;
1420                 else
1421                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1422                                 results.http_code);
1423         } else {
1424                 fprintf(stderr, "Unable to start UNLOCK request\n");
1425         }
1426
1427         curl_slist_free_all(dav_headers);
1428         free(lock_token_header);
1429
1430         if (remote->locks == lock) {
1431                 remote->locks = lock->next;
1432         } else {
1433                 while (prev && prev->next != lock)
1434                         prev = prev->next;
1435                 if (prev)
1436                         prev->next = prev->next->next;
1437         }
1438
1439         if (lock->owner != NULL)
1440                 free(lock->owner);
1441         free(lock->url);
1442         free(lock->token);
1443         free(lock);
1444
1445         return rc;
1446 }
1447
1448 static void remote_ls(const char *path, int flags,
1449                       void (*userFunc)(struct remote_ls_ctx *ls),
1450                       void *userData);
1451
1452 static void process_ls_object(struct remote_ls_ctx *ls)
1453 {
1454         unsigned int *parent = (unsigned int *)ls->userData;
1455         char *path = ls->dentry_name;
1456         char *obj_hex;
1457
1458         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1459                 remote_dir_exists[*parent] = 1;
1460                 return;
1461         }
1462
1463         if (strlen(path) != 49)
1464                 return;
1465         path += 8;
1466         obj_hex = xmalloc(strlen(path));
1467         strncpy(obj_hex, path, 2);
1468         strcpy(obj_hex + 2, path + 3);
1469         one_remote_object(obj_hex);
1470         free(obj_hex);
1471 }
1472
1473 static void process_ls_ref(struct remote_ls_ctx *ls)
1474 {
1475         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1476                 fprintf(stderr, "  %s\n", ls->dentry_name);
1477                 return;
1478         }
1479
1480         if (!(ls->dentry_flags & IS_DIR))
1481                 one_remote_ref(ls->dentry_name);
1482 }
1483
1484 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1485 {
1486         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1487
1488         if (tag_closed) {
1489                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1490                         if (ls->dentry_flags & IS_DIR) {
1491                                 if (ls->flags & PROCESS_DIRS) {
1492                                         ls->userFunc(ls);
1493                                 }
1494                                 if (strcmp(ls->dentry_name, ls->path) &&
1495                                     ls->flags & RECURSIVE) {
1496                                         remote_ls(ls->dentry_name,
1497                                                   ls->flags,
1498                                                   ls->userFunc,
1499                                                   ls->userData);
1500                                 }
1501                         } else if (ls->flags & PROCESS_FILES) {
1502                                 ls->userFunc(ls);
1503                         }
1504                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1505                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1506                                                   remote->path_len + 1);
1507                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1508                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1509                         ls->dentry_flags |= IS_DIR;
1510                 }
1511         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1512                 if (ls->dentry_name) {
1513                         free(ls->dentry_name);
1514                 }
1515                 ls->dentry_name = NULL;
1516                 ls->dentry_flags = 0;
1517         }
1518 }
1519
1520 static void remote_ls(const char *path, int flags,
1521                       void (*userFunc)(struct remote_ls_ctx *ls),
1522                       void *userData)
1523 {
1524         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1525         struct active_request_slot *slot;
1526         struct slot_results results;
1527         struct buffer in_buffer;
1528         struct buffer out_buffer;
1529         char *in_data;
1530         char *out_data;
1531         XML_Parser parser = XML_ParserCreate(NULL);
1532         enum XML_Status result;
1533         struct curl_slist *dav_headers = NULL;
1534         struct xml_ctx ctx;
1535         struct remote_ls_ctx ls;
1536
1537         ls.flags = flags;
1538         ls.path = strdup(path);
1539         ls.dentry_name = NULL;
1540         ls.dentry_flags = 0;
1541         ls.userData = userData;
1542         ls.userFunc = userFunc;
1543
1544         sprintf(url, "%s%s", remote->url, path);
1545
1546         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1547         out_data = xmalloc(out_buffer.size + 1);
1548         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1549         out_buffer.posn = 0;
1550         out_buffer.buffer = out_data;
1551
1552         in_buffer.size = 4096;
1553         in_data = xmalloc(in_buffer.size);
1554         in_buffer.posn = 0;
1555         in_buffer.buffer = in_data;
1556
1557         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1558         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1559
1560         slot = get_active_slot();
1561         slot->results = &results;
1562         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1563         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1564         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1565         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1566         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1567         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1568         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1569         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1570         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1571
1572         if (start_active_slot(slot)) {
1573                 run_active_slot(slot);
1574                 if (results.curl_result == CURLE_OK) {
1575                         ctx.name = xcalloc(10, 1);
1576                         ctx.len = 0;
1577                         ctx.cdata = NULL;
1578                         ctx.userFunc = handle_remote_ls_ctx;
1579                         ctx.userData = &ls;
1580                         XML_SetUserData(parser, &ctx);
1581                         XML_SetElementHandler(parser, xml_start_tag,
1582                                               xml_end_tag);
1583                         XML_SetCharacterDataHandler(parser, xml_cdata);
1584                         result = XML_Parse(parser, in_buffer.buffer,
1585                                            in_buffer.posn, 1);
1586                         free(ctx.name);
1587
1588                         if (result != XML_STATUS_OK) {
1589                                 fprintf(stderr, "XML error: %s\n",
1590                                         XML_ErrorString(
1591                                                 XML_GetErrorCode(parser)));
1592                         }
1593                 }
1594         } else {
1595                 fprintf(stderr, "Unable to start PROPFIND request\n");
1596         }
1597
1598         free(ls.path);
1599         free(url);
1600         free(out_data);
1601         free(in_buffer.buffer);
1602         curl_slist_free_all(dav_headers);
1603 }
1604
1605 static void get_remote_object_list(unsigned char parent)
1606 {
1607         char path[] = "objects/XX/";
1608         static const char hex[] = "0123456789abcdef";
1609         unsigned int val = parent;
1610
1611         path[8] = hex[val >> 4];
1612         path[9] = hex[val & 0xf];
1613         remote_dir_exists[val] = 0;
1614         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1615                   process_ls_object, &val);
1616 }
1617
1618 static int locking_available(void)
1619 {
1620         struct active_request_slot *slot;
1621         struct slot_results results;
1622         struct buffer in_buffer;
1623         struct buffer out_buffer;
1624         char *in_data;
1625         char *out_data;
1626         XML_Parser parser = XML_ParserCreate(NULL);
1627         enum XML_Status result;
1628         struct curl_slist *dav_headers = NULL;
1629         struct xml_ctx ctx;
1630         int lock_flags = 0;
1631
1632         out_buffer.size =
1633                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1634                 strlen(remote->url) - 2;
1635         out_data = xmalloc(out_buffer.size + 1);
1636         snprintf(out_data, out_buffer.size + 1,
1637                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1638         out_buffer.posn = 0;
1639         out_buffer.buffer = out_data;
1640
1641         in_buffer.size = 4096;
1642         in_data = xmalloc(in_buffer.size);
1643         in_buffer.posn = 0;
1644         in_buffer.buffer = in_data;
1645
1646         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1647         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1648
1649         slot = get_active_slot();
1650         slot->results = &results;
1651         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1653         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1654         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1655         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1656         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1657         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1658         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1659         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1660
1661         if (start_active_slot(slot)) {
1662                 run_active_slot(slot);
1663                 if (results.curl_result == CURLE_OK) {
1664                         ctx.name = xcalloc(10, 1);
1665                         ctx.len = 0;
1666                         ctx.cdata = NULL;
1667                         ctx.userFunc = handle_lockprop_ctx;
1668                         ctx.userData = &lock_flags;
1669                         XML_SetUserData(parser, &ctx);
1670                         XML_SetElementHandler(parser, xml_start_tag,
1671                                               xml_end_tag);
1672                         result = XML_Parse(parser, in_buffer.buffer,
1673                                            in_buffer.posn, 1);
1674                         free(ctx.name);
1675
1676                         if (result != XML_STATUS_OK) {
1677                                 fprintf(stderr, "XML error: %s\n",
1678                                         XML_ErrorString(
1679                                                 XML_GetErrorCode(parser)));
1680                                 lock_flags = 0;
1681                         }
1682                 }
1683         } else {
1684                 fprintf(stderr, "Unable to start PROPFIND request\n");
1685         }
1686
1687         free(out_data);
1688         free(in_buffer.buffer);
1689         curl_slist_free_all(dav_headers);
1690
1691         return lock_flags;
1692 }
1693
1694 static struct object_list **process_blob(struct blob *blob,
1695                                          struct object_list **p,
1696                                          struct name_path *path,
1697                                          const char *name)
1698 {
1699         struct object *obj = &blob->object;
1700
1701         obj->flags |= LOCAL;
1702
1703         if (obj->flags & (UNINTERESTING | SEEN))
1704                 return p;
1705
1706         obj->flags |= SEEN;
1707         return add_object(obj, p, path, name);
1708 }
1709
1710 static struct object_list **process_tree(struct tree *tree,
1711                                          struct object_list **p,
1712                                          struct name_path *path,
1713                                          const char *name)
1714 {
1715         struct object *obj = &tree->object;
1716         struct tree_entry_list *entry;
1717         struct name_path me;
1718
1719         obj->flags |= LOCAL;
1720
1721         if (obj->flags & (UNINTERESTING | SEEN))
1722                 return p;
1723         if (parse_tree(tree) < 0)
1724                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1725
1726         obj->flags |= SEEN;
1727         p = add_object(obj, p, NULL, name);
1728         me.up = path;
1729         me.elem = name;
1730         me.elem_len = strlen(name);
1731         entry = tree->entries;
1732         tree->entries = NULL;
1733         while (entry) {
1734                 struct tree_entry_list *next = entry->next;
1735                 if (entry->directory)
1736                         p = process_tree(entry->item.tree, p, &me, entry->name);
1737                 else
1738                         p = process_blob(entry->item.blob, p, &me, entry->name);
1739                 free(entry);
1740                 entry = next;
1741         }
1742         return p;
1743 }
1744
1745 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1746 {
1747         struct commit *commit;
1748         struct object_list **p = &objects, *pending;
1749         int count = 0;
1750
1751         while ((commit = get_revision(revs)) != NULL) {
1752                 p = process_tree(commit->tree, p, NULL, "");
1753                 commit->object.flags |= LOCAL;
1754                 if (!(commit->object.flags & UNINTERESTING))
1755                         count += add_send_request(&commit->object, lock);
1756         }
1757
1758         for (pending = revs->pending_objects; pending; pending = pending->next) {
1759                 struct object *obj = pending->item;
1760                 const char *name = pending->name;
1761
1762                 if (obj->flags & (UNINTERESTING | SEEN))
1763                         continue;
1764                 if (obj->type == tag_type) {
1765                         obj->flags |= SEEN;
1766                         p = add_object(obj, p, NULL, name);
1767                         continue;
1768                 }
1769                 if (obj->type == tree_type) {
1770                         p = process_tree((struct tree *)obj, p, NULL, name);
1771                         continue;
1772                 }
1773                 if (obj->type == blob_type) {
1774                         p = process_blob((struct blob *)obj, p, NULL, name);
1775                         continue;
1776                 }
1777                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1778         }
1779
1780         while (objects) {
1781                 if (!(objects->item->flags & UNINTERESTING))
1782                         count += add_send_request(objects->item, lock);
1783                 objects = objects->next;
1784         }
1785
1786         return count;
1787 }
1788
1789 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1790 {
1791         struct active_request_slot *slot;
1792         struct slot_results results;
1793         char *out_data;
1794         char *if_header;
1795         struct buffer out_buffer;
1796         struct curl_slist *dav_headers = NULL;
1797         int i;
1798
1799         if_header = xmalloc(strlen(lock->token) + 25);
1800         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1801         dav_headers = curl_slist_append(dav_headers, if_header);
1802
1803         out_buffer.size = 41;
1804         out_data = xmalloc(out_buffer.size + 1);
1805         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1806         if (i != out_buffer.size) {
1807                 fprintf(stderr, "Unable to initialize PUT request body\n");
1808                 return 0;
1809         }
1810         out_buffer.posn = 0;
1811         out_buffer.buffer = out_data;
1812
1813         slot = get_active_slot();
1814         slot->results = &results;
1815         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1816         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1817         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1818         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1819         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1820         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1821         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1822         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1823         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1824
1825         if (start_active_slot(slot)) {
1826                 run_active_slot(slot);
1827                 free(out_data);
1828                 free(if_header);
1829                 if (results.curl_result != CURLE_OK) {
1830                         fprintf(stderr,
1831                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1832                                 results.curl_result, results.http_code);
1833                         /* We should attempt recovery? */
1834                         return 0;
1835                 }
1836         } else {
1837                 free(out_data);
1838                 free(if_header);
1839                 fprintf(stderr, "Unable to start PUT request\n");
1840                 return 0;
1841         }
1842
1843         return 1;
1844 }
1845
1846 static struct ref *local_refs, **local_tail;
1847 static struct ref *remote_refs, **remote_tail;
1848
1849 static int one_local_ref(const char *refname, const unsigned char *sha1)
1850 {
1851         struct ref *ref;
1852         int len = strlen(refname) + 1;
1853         ref = xcalloc(1, sizeof(*ref) + len);
1854         memcpy(ref->new_sha1, sha1, 20);
1855         memcpy(ref->name, refname, len);
1856         *local_tail = ref;
1857         local_tail = &ref->next;
1858         return 0;
1859 }
1860
1861 static void one_remote_ref(char *refname)
1862 {
1863         struct ref *ref;
1864         unsigned char remote_sha1[20];
1865         struct object *obj;
1866         int len = strlen(refname) + 1;
1867
1868         if (fetch_ref(refname, remote_sha1) != 0) {
1869                 fprintf(stderr,
1870                         "Unable to fetch ref %s from %s\n",
1871                         refname, remote->url);
1872                 return;
1873         }
1874
1875         /*
1876          * Fetch a copy of the object if it doesn't exist locally - it
1877          * may be required for updating server info later.
1878          */
1879         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1880                 obj = lookup_unknown_object(remote_sha1);
1881                 if (obj) {
1882                         fprintf(stderr, "  fetch %s for %s\n",
1883                                 sha1_to_hex(remote_sha1), refname);
1884                         add_fetch_request(obj);
1885                 }
1886         }
1887
1888         ref = xcalloc(1, sizeof(*ref) + len);
1889         memcpy(ref->old_sha1, remote_sha1, 20);
1890         memcpy(ref->name, refname, len);
1891         *remote_tail = ref;
1892         remote_tail = &ref->next;
1893 }
1894
1895 static void get_local_heads(void)
1896 {
1897         local_tail = &local_refs;
1898         for_each_ref(one_local_ref);
1899 }
1900
1901 static void get_dav_remote_heads(void)
1902 {
1903         remote_tail = &remote_refs;
1904         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1905 }
1906
1907 static int is_zero_sha1(const unsigned char *sha1)
1908 {
1909         int i;
1910
1911         for (i = 0; i < 20; i++) {
1912                 if (*sha1++)
1913                         return 0;
1914         }
1915         return 1;
1916 }
1917
1918 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1919 {
1920         while (list) {
1921                 struct commit_list *temp = list;
1922                 temp->item->object.flags &= ~mark;
1923                 list = temp->next;
1924                 free(temp);
1925         }
1926 }
1927
1928 static int ref_newer(const unsigned char *new_sha1,
1929                      const unsigned char *old_sha1)
1930 {
1931         struct object *o;
1932         struct commit *old, *new;
1933         struct commit_list *list, *used;
1934         int found = 0;
1935
1936         /* Both new and old must be commit-ish and new is descendant of
1937          * old.  Otherwise we require --force.
1938          */
1939         o = deref_tag(parse_object(old_sha1), NULL, 0);
1940         if (!o || o->type != commit_type)
1941                 return 0;
1942         old = (struct commit *) o;
1943
1944         o = deref_tag(parse_object(new_sha1), NULL, 0);
1945         if (!o || o->type != commit_type)
1946                 return 0;
1947         new = (struct commit *) o;
1948
1949         if (parse_commit(new) < 0)
1950                 return 0;
1951
1952         used = list = NULL;
1953         commit_list_insert(new, &list);
1954         while (list) {
1955                 new = pop_most_recent_commit(&list, TMP_MARK);
1956                 commit_list_insert(new, &used);
1957                 if (new == old) {
1958                         found = 1;
1959                         break;
1960                 }
1961         }
1962         unmark_and_free(list, TMP_MARK);
1963         unmark_and_free(used, TMP_MARK);
1964         return found;
1965 }
1966
1967 static void mark_edge_parents_uninteresting(struct commit *commit)
1968 {
1969         struct commit_list *parents;
1970
1971         for (parents = commit->parents; parents; parents = parents->next) {
1972                 struct commit *parent = parents->item;
1973                 if (!(parent->object.flags & UNINTERESTING))
1974                         continue;
1975                 mark_tree_uninteresting(parent->tree);
1976         }
1977 }
1978
1979 static void mark_edges_uninteresting(struct commit_list *list)
1980 {
1981         for ( ; list; list = list->next) {
1982                 struct commit *commit = list->item;
1983
1984                 if (commit->object.flags & UNINTERESTING) {
1985                         mark_tree_uninteresting(commit->tree);
1986                         continue;
1987                 }
1988                 mark_edge_parents_uninteresting(commit);
1989         }
1990 }
1991
1992 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1993 {
1994         struct buffer *buf = (struct buffer *)ls->userData;
1995         unsigned char remote_sha1[20];
1996         struct object *o;
1997         int len;
1998         char *ref_info;
1999
2000         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2001                 fprintf(stderr,
2002                         "Unable to fetch ref %s from %s\n",
2003                         ls->dentry_name, remote->url);
2004                 aborted = 1;
2005                 return;
2006         }
2007
2008         o = parse_object(remote_sha1);
2009         if (!o) {
2010                 fprintf(stderr,
2011                         "Unable to parse object %s for remote ref %s\n",
2012                         sha1_to_hex(remote_sha1), ls->dentry_name);
2013                 aborted = 1;
2014                 return;
2015         }
2016
2017         len = strlen(ls->dentry_name) + 42;
2018         ref_info = xcalloc(len + 1, 1);
2019         sprintf(ref_info, "%s   %s\n",
2020                 sha1_to_hex(remote_sha1), ls->dentry_name);
2021         fwrite_buffer(ref_info, 1, len, buf);
2022         free(ref_info);
2023
2024         if (o->type == tag_type) {
2025                 o = deref_tag(o, ls->dentry_name, 0);
2026                 if (o) {
2027                         len = strlen(ls->dentry_name) + 45;
2028                         ref_info = xcalloc(len + 1, 1);
2029                         sprintf(ref_info, "%s   %s^{}\n",
2030                                 sha1_to_hex(o->sha1), ls->dentry_name);
2031                         fwrite_buffer(ref_info, 1, len, buf);
2032                         free(ref_info);
2033                 }
2034         }
2035 }
2036
2037 static void update_remote_info_refs(struct remote_lock *lock)
2038 {
2039         struct buffer buffer;
2040         struct active_request_slot *slot;
2041         struct slot_results results;
2042         char *if_header;
2043         struct curl_slist *dav_headers = NULL;
2044
2045         buffer.buffer = xcalloc(1, 4096);
2046         buffer.size = 4096;
2047         buffer.posn = 0;
2048         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2049                   add_remote_info_ref, &buffer);
2050         if (!aborted) {
2051                 if_header = xmalloc(strlen(lock->token) + 25);
2052                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2053                 dav_headers = curl_slist_append(dav_headers, if_header);
2054
2055                 slot = get_active_slot();
2056                 slot->results = &results;
2057                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2058                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2059                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2060                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2061                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2062                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2063                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2064                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2065                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2066
2067                 buffer.posn = 0;
2068
2069                 if (start_active_slot(slot)) {
2070                         run_active_slot(slot);
2071                         if (results.curl_result != CURLE_OK) {
2072                                 fprintf(stderr,
2073                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2074                                         results.curl_result, results.http_code);
2075                         }
2076                 }
2077                 free(if_header);
2078         }
2079         free(buffer.buffer);
2080 }
2081
2082 static int remote_exists(const char *path)
2083 {
2084         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2085         struct active_request_slot *slot;
2086         struct slot_results results;
2087
2088         sprintf(url, "%s%s", remote->url, path);
2089
2090         slot = get_active_slot();
2091         slot->results = &results;
2092         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2093         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2094
2095         if (start_active_slot(slot)) {
2096                 run_active_slot(slot);
2097                 if (results.http_code == 404)
2098                         return 0;
2099                 else if (results.curl_result == CURLE_OK)
2100                         return 1;
2101                 else
2102                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2103         } else {
2104                 fprintf(stderr, "Unable to start HEAD request\n");
2105         }
2106
2107         return -1;
2108 }
2109
2110 static void fetch_symref(char *path, char **symref, unsigned char *sha1)
2111 {
2112         char *url;
2113         struct buffer buffer;
2114         struct active_request_slot *slot;
2115         struct slot_results results;
2116
2117         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2118         sprintf(url, "%s%s", remote->url, path);
2119
2120         buffer.size = 4096;
2121         buffer.posn = 0;
2122         buffer.buffer = xmalloc(buffer.size);
2123
2124         slot = get_active_slot();
2125         slot->results = &results;
2126         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2127         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2128         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2129         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2130         if (start_active_slot(slot)) {
2131                 run_active_slot(slot);
2132                 if (results.curl_result != CURLE_OK) {
2133                         die("Couldn't get %s for remote symref\n%s",
2134                             url, curl_errorstr);
2135                 }
2136         } else {
2137                 die("Unable to start remote symref request");
2138         }
2139         free(url);
2140
2141         if (*symref != NULL)
2142                 free(*symref);
2143         *symref = NULL;
2144         memset(sha1, 0, 20);
2145
2146         if (buffer.posn == 0)
2147                 return;
2148
2149         /* If it's a symref, set the refname; otherwise try for a sha1 */
2150         if (!strncmp((char *)buffer.buffer, "ref: ", 5)) {
2151                 *symref = xcalloc(buffer.posn - 5, 1);
2152                 strncpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6);
2153         } else {
2154                 get_sha1_hex(buffer.buffer, sha1);
2155         }
2156
2157         free(buffer.buffer);
2158 }
2159
2160 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2161 {
2162         int pipe_fd[2];
2163         pid_t merge_base_pid;
2164         char line[PATH_MAX + 20];
2165         unsigned char merge_sha1[20];
2166         int verified = 0;
2167
2168         if (pipe(pipe_fd) < 0)
2169                 die("Verify merge base: pipe failed");
2170
2171         merge_base_pid = fork();
2172         if (!merge_base_pid) {
2173                 static const char *args[] = {
2174                         "merge-base",
2175                         "-a",
2176                         NULL,
2177                         NULL,
2178                         NULL
2179                 };
2180                 args[2] = strdup(sha1_to_hex(head_sha1));
2181                 args[3] = sha1_to_hex(branch_sha1);
2182
2183                 dup2(pipe_fd[1], 1);
2184                 close(pipe_fd[0]);
2185                 close(pipe_fd[1]);
2186                 execv_git_cmd(args);
2187                 die("merge-base setup failed");
2188         }
2189         if (merge_base_pid < 0)
2190                 die("merge-base fork failed");
2191
2192         dup2(pipe_fd[0], 0);
2193         close(pipe_fd[0]);
2194         close(pipe_fd[1]);
2195         while (fgets(line, sizeof(line), stdin) != NULL) {
2196                 if (get_sha1_hex(line, merge_sha1))
2197                         die("expected sha1, got garbage:\n %s", line);
2198                 if (!memcmp(branch_sha1, merge_sha1, 20)) {
2199                         verified = 1;
2200                         break;
2201                 }
2202         }
2203
2204         return verified;
2205 }
2206
2207 static int delete_remote_branch(char *pattern, int force)
2208 {
2209         struct ref *refs = remote_refs;
2210         struct ref *remote_ref = NULL;
2211         unsigned char head_sha1[20];
2212         char *symref = NULL;
2213         int match;
2214         int patlen = strlen(pattern);
2215         int i;
2216         struct active_request_slot *slot;
2217         struct slot_results results;
2218         char *url;
2219
2220         /* Find the remote branch(es) matching the specified branch name */
2221         for (match = 0; refs; refs = refs->next) {
2222                 char *name = refs->name;
2223                 int namelen = strlen(name);
2224                 if (namelen < patlen ||
2225                     memcmp(name + namelen - patlen, pattern, patlen))
2226                         continue;
2227                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2228                         continue;
2229                 match++;
2230                 remote_ref = refs;
2231         }
2232         if (match == 0)
2233                 return error("No remote branch matches %s", pattern);
2234         if (match != 1)
2235                 return error("More than one remote branch matches %s",
2236                              pattern);
2237
2238         /*
2239          * Remote HEAD must be a symref (not exactly foolproof; a remote
2240          * symlink to a symref will look like a symref)
2241          */
2242         fetch_symref("HEAD", &symref, head_sha1);
2243         if (!symref)
2244                 return error("Remote HEAD is not a symref");
2245
2246         /* Remote branch must not be the remote HEAD */
2247         for (i=0; symref && i<MAXDEPTH; i++) {
2248                 if (!strcmp(remote_ref->name, symref))
2249                         return error("Remote branch %s is the current HEAD",
2250                                      remote_ref->name);
2251                 fetch_symref(symref, &symref, head_sha1);
2252         }
2253
2254         /* Run extra sanity checks if delete is not forced */
2255         if (!force) {
2256                 /* Remote HEAD must resolve to a known object */
2257                 if (symref)
2258                         return error("Remote HEAD symrefs too deep");
2259                 if (is_zero_sha1(head_sha1))
2260                         return error("Unable to resolve remote HEAD");
2261                 if (!has_sha1_file(head_sha1))
2262                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2263
2264                 /* Remote branch must resolve to a known object */
2265                 if (is_zero_sha1(remote_ref->old_sha1))
2266                         return error("Unable to resolve remote branch %s",
2267                                      remote_ref->name);
2268                 if (!has_sha1_file(remote_ref->old_sha1))
2269                         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));
2270
2271                 /* Remote branch must be an ancestor of remote HEAD */
2272                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2273                         return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern);
2274                 }
2275         }
2276
2277         /* Send delete request */
2278         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2279         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2280         sprintf(url, "%s%s", remote->url, remote_ref->name);
2281         slot = get_active_slot();
2282         slot->results = &results;
2283         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2284         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2285         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2286         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2287         if (start_active_slot(slot)) {
2288                 run_active_slot(slot);
2289                 free(url);
2290                 if (results.curl_result != CURLE_OK)
2291                         return error("DELETE request failed (%d/%ld)\n",
2292                                      results.curl_result, results.http_code);
2293         } else {
2294                 free(url);
2295                 return error("Unable to start DELETE request");
2296         }
2297
2298         return 0;
2299 }
2300
2301 int main(int argc, char **argv)
2302 {
2303         struct transfer_request *request;
2304         struct transfer_request *next_request;
2305         int nr_refspec = 0;
2306         char **refspec = NULL;
2307         struct remote_lock *ref_lock = NULL;
2308         struct remote_lock *info_ref_lock = NULL;
2309         struct rev_info revs;
2310         int delete_branch = 0;
2311         int force_delete = 0;
2312         int objects_to_send;
2313         int rc = 0;
2314         int i;
2315         int new_refs;
2316         struct ref *ref;
2317
2318         setup_git_directory();
2319         setup_ident();
2320
2321         remote = xcalloc(sizeof(*remote), 1);
2322
2323         argv++;
2324         for (i = 1; i < argc; i++, argv++) {
2325                 char *arg = *argv;
2326
2327                 if (*arg == '-') {
2328                         if (!strcmp(arg, "--all")) {
2329                                 push_all = 1;
2330                                 continue;
2331                         }
2332                         if (!strcmp(arg, "--force")) {
2333                                 force_all = 1;
2334                                 continue;
2335                         }
2336                         if (!strcmp(arg, "--verbose")) {
2337                                 push_verbosely = 1;
2338                                 continue;
2339                         }
2340                         if (!strcmp(arg, "-d")) {
2341                                 delete_branch = 1;
2342                                 continue;
2343                         }
2344                         if (!strcmp(arg, "-D")) {
2345                                 delete_branch = 1;
2346                                 force_delete = 1;
2347                                 continue;
2348                         }
2349                 }
2350                 if (!remote->url) {
2351                         char *path = strstr(arg, "//");
2352                         remote->url = arg;
2353                         if (path) {
2354                                 path = strchr(path+2, '/');
2355                                 if (path)
2356                                         remote->path_len = strlen(path);
2357                         }
2358                         continue;
2359                 }
2360                 refspec = argv;
2361                 nr_refspec = argc - i;
2362                 break;
2363         }
2364
2365         if (!remote->url)
2366                 usage(http_push_usage);
2367
2368         if (delete_branch && nr_refspec != 1)
2369                 die("You must specify only one branch name when deleting a remote branch");
2370
2371         memset(remote_dir_exists, -1, 256);
2372
2373         http_init();
2374
2375         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2376         default_headers = curl_slist_append(default_headers, "Range:");
2377         default_headers = curl_slist_append(default_headers, "Destination:");
2378         default_headers = curl_slist_append(default_headers, "If:");
2379         default_headers = curl_slist_append(default_headers,
2380                                             "Pragma: no-cache");
2381
2382         /* Verify DAV compliance/lock support */
2383         if (!locking_available()) {
2384                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2385                 rc = 1;
2386                 goto cleanup;
2387         }
2388
2389         /* Check whether the remote has server info files */
2390         remote->can_update_info_refs = 0;
2391         remote->has_info_refs = remote_exists("info/refs");
2392         remote->has_info_packs = remote_exists("objects/info/packs");
2393         if (remote->has_info_refs) {
2394                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2395                 if (info_ref_lock)
2396                         remote->can_update_info_refs = 1;
2397         }
2398         if (remote->has_info_packs)
2399                 fetch_indices();
2400
2401         /* Get a list of all local and remote heads to validate refspecs */
2402         get_local_heads();
2403         fprintf(stderr, "Fetching remote heads...\n");
2404         get_dav_remote_heads();
2405
2406         /* Remove a remote branch if -d or -D was specified */
2407         if (delete_branch) {
2408                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2409                         fprintf(stderr, "Unable to delete remote branch %s\n",
2410                                 refspec[0]);
2411                 goto cleanup;
2412         }
2413
2414         /* match them up */
2415         if (!remote_tail)
2416                 remote_tail = &remote_refs;
2417         if (match_refs(local_refs, remote_refs, &remote_tail,
2418                        nr_refspec, refspec, push_all))
2419                 return -1;
2420         if (!remote_refs) {
2421                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2422                 return 0;
2423         }
2424
2425         new_refs = 0;
2426         for (ref = remote_refs; ref; ref = ref->next) {
2427                 char old_hex[60], *new_hex;
2428                 const char *commit_argv[4];
2429                 int commit_argc;
2430                 char *new_sha1_hex, *old_sha1_hex;
2431
2432                 if (!ref->peer_ref)
2433                         continue;
2434                 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
2435                         if (push_verbosely || 1)
2436                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2437                         continue;
2438                 }
2439
2440                 if (!force_all &&
2441                     !is_zero_sha1(ref->old_sha1) &&
2442                     !ref->force) {
2443                         if (!has_sha1_file(ref->old_sha1) ||
2444                             !ref_newer(ref->peer_ref->new_sha1,
2445                                        ref->old_sha1)) {
2446                                 /* We do not have the remote ref, or
2447                                  * we know that the remote ref is not
2448                                  * an ancestor of what we are trying to
2449                                  * push.  Either way this can be losing
2450                                  * commits at the remote end and likely
2451                                  * we were not up to date to begin with.
2452                                  */
2453                                 error("remote '%s' is not a strict "
2454                                       "subset of local ref '%s'. "
2455                                       "maybe you are not up-to-date and "
2456                                       "need to pull first?",
2457                                       ref->name,
2458                                       ref->peer_ref->name);
2459                                 rc = -2;
2460                                 continue;
2461                         }
2462                 }
2463                 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
2464                 if (is_zero_sha1(ref->new_sha1)) {
2465                         error("cannot happen anymore");
2466                         rc = -3;
2467                         continue;
2468                 }
2469                 new_refs++;
2470                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2471                 new_hex = sha1_to_hex(ref->new_sha1);
2472
2473                 fprintf(stderr, "updating '%s'", ref->name);
2474                 if (strcmp(ref->name, ref->peer_ref->name))
2475                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2476                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2477
2478
2479                 /* Lock remote branch ref */
2480                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2481                 if (ref_lock == NULL) {
2482                         fprintf(stderr, "Unable to lock remote branch %s\n",
2483                                 ref->name);
2484                         rc = 1;
2485                         continue;
2486                 }
2487
2488                 /* Set up revision info for this refspec */
2489                 commit_argc = 3;
2490                 new_sha1_hex = strdup(sha1_to_hex(ref->new_sha1));
2491                 old_sha1_hex = NULL;
2492                 commit_argv[1] = "--objects";
2493                 commit_argv[2] = new_sha1_hex;
2494                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2495                         old_sha1_hex = xmalloc(42);
2496                         sprintf(old_sha1_hex, "^%s",
2497                                 sha1_to_hex(ref->old_sha1));
2498                         commit_argv[3] = old_sha1_hex;
2499                         commit_argc++;
2500                 }
2501                 init_revisions(&revs);
2502                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2503                 free(new_sha1_hex);
2504                 if (old_sha1_hex) {
2505                         free(old_sha1_hex);
2506                         commit_argv[1] = NULL;
2507                 }
2508
2509                 /* Generate a list of objects that need to be pushed */
2510                 pushing = 0;
2511                 prepare_revision_walk(&revs);
2512                 mark_edges_uninteresting(revs.commits);
2513                 objects_to_send = get_delta(&revs, ref_lock);
2514                 finish_all_active_slots();
2515
2516                 /* Push missing objects to remote, this would be a
2517                    convenient time to pack them first if appropriate. */
2518                 pushing = 1;
2519                 if (objects_to_send)
2520                         fprintf(stderr, "    sending %d objects\n",
2521                                 objects_to_send);
2522                 fill_active_slots();
2523                 finish_all_active_slots();
2524
2525                 /* Update the remote branch if all went well */
2526                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2527                         rc = 1;
2528                         goto unlock;
2529                 }
2530
2531         unlock:
2532                 if (!rc)
2533                         fprintf(stderr, "    done\n");
2534                 unlock_remote(ref_lock);
2535                 check_locks();
2536         }
2537
2538         /* Update remote server info if appropriate */
2539         if (remote->has_info_refs && new_refs) {
2540                 if (info_ref_lock && remote->can_update_info_refs) {
2541                         fprintf(stderr, "Updating remote server info\n");
2542                         update_remote_info_refs(info_ref_lock);
2543                 } else {
2544                         fprintf(stderr, "Unable to update server info\n");
2545                 }
2546         }
2547         if (info_ref_lock)
2548                 unlock_remote(info_ref_lock);
2549
2550  cleanup:
2551         free(remote);
2552
2553         curl_slist_free_all(no_pragma_header);
2554         curl_slist_free_all(default_headers);
2555
2556         http_cleanup();
2557
2558         request = request_queue_head;
2559         while (request != NULL) {
2560                 next_request = request->next;
2561                 release_request(request);
2562                 request = next_request;
2563         }
2564
2565         return rc;
2566 }