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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14
  15 #include <expat.h>
  16
  17 static const char http_push_usage[] =
  18 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20 #ifndef XML_STATUS_OK
  21 enum XML_Status {
  22   XML_STATUS_OK = 1,
  23   XML_STATUS_ERROR = 0
  24 };
  25 #define XML_STATUS_OK    1
  26 #define XML_STATUS_ERROR 0
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 /* DAV methods */
  33 #define DAV_LOCK "LOCK"
  34 #define DAV_MKCOL "MKCOL"
  35 #define DAV_MOVE "MOVE"
  36 #define DAV_PROPFIND "PROPFIND"
  37 #define DAV_PUT "PUT"
  38 #define DAV_UNLOCK "UNLOCK"
  39 #define DAV_DELETE "DELETE"
  40
  41 /* DAV lock flags */
  42 #define DAV_PROP_LOCKWR (1u << 0)
  43 #define DAV_PROP_LOCKEX (1u << 1)
  44 #define DAV_LOCK_OK (1u << 2)
  45
  46 /* DAV XML properties */
  47 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53 #define DAV_PROPFIND_RESP ".multistatus.response"
  54 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  55 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57 /* DAV request body templates */
  58 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  59 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  61
  62 #define LOCK_TIME 600
  63 #define LOCK_REFRESH 30
  64
  65 /* bits #0-15 in revision.h */
  66
  67 #define LOCAL    (1u<<16)
  68 #define REMOTE   (1u<<17)
  69 #define FETCHING (1u<<18)
  70 #define PUSHING  (1u<<19)
  71
  72 /* We allow "recursive" symbolic refs. Only within reason, though */
  73 #define MAXDEPTH 5
  74
  75 static int pushing;
  76 static int aborted;
  77 static signed char remote_dir_exists[256];
  78
  79 static struct curl_slist *no_pragma_header;
  80
  81 static int push_verbosely;
  82 static int push_all = MATCH_REFS_NONE;
  83 static int force_all;
  84 static int dry_run;
  85
  86 static struct object_list *objects;
  87
  88 struct repo
  89 {
  90         char *url;
  91         char *path;
  92         int path_len;
  93         int has_info_refs;
  94         int can_update_info_refs;
  95         int has_info_packs;
  96         struct packed_git *packs;
  97         struct remote_lock *locks;
  98 };
  99
 100 static struct repo *remote;
 101
 102 enum transfer_state {
 103         NEED_FETCH,
 104         RUN_FETCH_LOOSE,
 105         RUN_FETCH_PACKED,
 106         NEED_PUSH,
 107         RUN_MKCOL,
 108         RUN_PUT,
 109         RUN_MOVE,
 110         ABORTED,
 111         COMPLETE,
 112 };
 113
 114 struct transfer_request
 115 {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         char filename[PATH_MAX];
 123         char tmpfile[PATH_MAX];
 124         int local_fileno;
 125         FILE *local_stream;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         unsigned char real_sha1[20];
 131         git_SHA_CTX c;
 132         z_stream stream;
 133         int zret;
 134         int rename;
 135         void *userData;
 136         struct active_request_slot *slot;
 137         struct transfer_request *next;
 138 };
 139
 140 static struct transfer_request *request_queue_head;
 141
 142 struct xml_ctx
 143 {
 144         char *name;
 145         int len;
 146         char *cdata;
 147         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148         void *userData;
 149 };
 150
 151 struct remote_lock
 152 {
 153         char *url;
 154         char *owner;
 155         char *token;
 156         char tmpfile_suffix[41];
 157         time_t start_time;
 158         long timeout;
 159         int refreshing;
 160         struct remote_lock *next;
 161 };
 162
 163 /* Flags that control remote_ls processing */
 164 #define PROCESS_FILES (1u << 0)
 165 #define PROCESS_DIRS  (1u << 1)
 166 #define RECURSIVE     (1u << 2)
 167
 168 /* Flags that remote_ls passes to callback functions */
 169 #define IS_DIR (1u << 0)
 170
 171 struct remote_ls_ctx
 172 {
 173         char *path;
 174         void (*userFunc)(struct remote_ls_ctx *ls);
 175         void *userData;
 176         int flags;
 177         char *dentry_name;
 178         int dentry_flags;
 179         struct remote_ls_ctx *parent;
 180 };
 181
 182 /* get_dav_token_headers options */
 183 enum dav_header_flag {
 184         DAV_HEADER_IF = (1u << 0),
 185         DAV_HEADER_LOCK = (1u << 1),
 186         DAV_HEADER_TIMEOUT = (1u << 2)
 187 };
 188
 189 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 190 {
 191         struct strbuf buf = STRBUF_INIT;
 192         struct curl_slist *dav_headers = NULL;
 193
 194         if (options & DAV_HEADER_IF) {
 195                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 196                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 197                 strbuf_reset(&buf);
 198         }
 199         if (options & DAV_HEADER_LOCK) {
 200                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 201                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 202                 strbuf_reset(&buf);
 203         }
 204         if (options & DAV_HEADER_TIMEOUT) {
 205                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 206                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 207                 strbuf_reset(&buf);
 208         }
 209         strbuf_release(&buf);
 210
 211         return dav_headers;
 212 }
 213
 214 static void append_remote_object_url(struct strbuf *buf, const char *url,
 215                                      const char *hex,
 216                                      int only_two_digit_prefix)
 217 {
 218         strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 219         if (!only_two_digit_prefix)
 220                 strbuf_addf(buf, "%s", hex+2);
 221 }
 222
 223 static void finish_request(struct transfer_request *request);
 224 static void release_request(struct transfer_request *request);
 225
 226 static void process_response(void *callback_data)
 227 {
 228         struct transfer_request *request =
 229                 (struct transfer_request *)callback_data;
 230
 231         finish_request(request);
 232 }
 233
 234 #ifdef USE_CURL_MULTI
 235
 236 static char *get_remote_object_url(const char *url, const char *hex,
 237                                    int only_two_digit_prefix)
 238 {
 239         struct strbuf buf = STRBUF_INIT;
 240         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 241         return strbuf_detach(&buf, NULL);
 242 }
 243
 244 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 245                                void *data)
 246 {
 247         unsigned char expn[4096];
 248         size_t size = eltsize * nmemb;
 249         int posn = 0;
 250         struct transfer_request *request = (struct transfer_request *)data;
 251         do {
 252                 ssize_t retval = xwrite(request->local_fileno,
 253                                        (char *) ptr + posn, size - posn);
 254                 if (retval < 0)
 255                         return posn;
 256                 posn += retval;
 257         } while (posn < size);
 258
 259         request->stream.avail_in = size;
 260         request->stream.next_in = ptr;
 261         do {
 262                 request->stream.next_out = expn;
 263                 request->stream.avail_out = sizeof(expn);
 264                 request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 265                 git_SHA1_Update(&request->c, expn,
 266                             sizeof(expn) - request->stream.avail_out);
 267         } while (request->stream.avail_in && request->zret == Z_OK);
 268         data_received++;
 269         return size;
 270 }
 271
 272 static void start_fetch_loose(struct transfer_request *request)
 273 {
 274         char *hex = sha1_to_hex(request->obj->sha1);
 275         char *filename;
 276         char prevfile[PATH_MAX];
 277         char *url;
 278         int prevlocal;
 279         unsigned char prev_buf[PREV_BUF_SIZE];
 280         ssize_t prev_read = 0;
 281         long prev_posn = 0;
 282         char range[RANGE_HEADER_SIZE];
 283         struct curl_slist *range_header = NULL;
 284         struct active_request_slot *slot;
 285
 286         filename = sha1_file_name(request->obj->sha1);
 287         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 288         snprintf(request->tmpfile, sizeof(request->tmpfile),
 289                  "%s.temp", filename);
 290
 291         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 292         unlink(prevfile);
 293         rename(request->tmpfile, prevfile);
 294         unlink(request->tmpfile);
 295
 296         if (request->local_fileno != -1)
 297                 error("fd leakage in start: %d", request->local_fileno);
 298         request->local_fileno = open(request->tmpfile,
 299                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 300         /* This could have failed due to the "lazy directory creation";
 301          * try to mkdir the last path component.
 302          */
 303         if (request->local_fileno < 0 && errno == ENOENT) {
 304                 char *dir = strrchr(request->tmpfile, '/');
 305                 if (dir) {
 306                         *dir = 0;
 307                         mkdir(request->tmpfile, 0777);
 308                         *dir = '/';
 309                 }
 310                 request->local_fileno = open(request->tmpfile,
 311                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 312         }
 313
 314         if (request->local_fileno < 0) {
 315                 request->state = ABORTED;
 316                 error("Couldn't create temporary file %s for %s: %s",
 317                       request->tmpfile, request->filename, strerror(errno));
 318                 return;
 319         }
 320
 321         memset(&request->stream, 0, sizeof(request->stream));
 322
 323         git_inflate_init(&request->stream);
 324
 325         git_SHA1_Init(&request->c);
 326
 327         url = get_remote_object_url(remote->url, hex, 0);
 328         request->url = xstrdup(url);
 329
 330         /* If a previous temp file is present, process what was already
 331            fetched. */
 332         prevlocal = open(prevfile, O_RDONLY);
 333         if (prevlocal != -1) {
 334                 do {
 335                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 336                         if (prev_read>0) {
 337                                 if (fwrite_sha1_file(prev_buf,
 338                                                      1,
 339                                                      prev_read,
 340                                                      request) == prev_read) {
 341                                         prev_posn += prev_read;
 342                                 } else {
 343                                         prev_read = -1;
 344                                 }
 345                         }
 346                 } while (prev_read > 0);
 347                 close(prevlocal);
 348         }
 349         unlink(prevfile);
 350
 351         /* Reset inflate/SHA1 if there was an error reading the previous temp
 352            file; also rewind to the beginning of the local file. */
 353         if (prev_read == -1) {
 354                 memset(&request->stream, 0, sizeof(request->stream));
 355                 git_inflate_init(&request->stream);
 356                 git_SHA1_Init(&request->c);
 357                 if (prev_posn>0) {
 358                         prev_posn = 0;
 359                         lseek(request->local_fileno, 0, SEEK_SET);
 360                         ftruncate(request->local_fileno, 0);
 361                 }
 362         }
 363
 364         slot = get_active_slot();
 365         slot->callback_func = process_response;
 366         slot->callback_data = request;
 367         request->slot = slot;
 368
 369         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 370         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 371         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 372         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 373         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 374
 375         /* If we have successfully processed data from a previous fetch
 376            attempt, only fetch the data we don't already have. */
 377         if (prev_posn>0) {
 378                 if (push_verbosely)
 379                         fprintf(stderr,
 380                                 "Resuming fetch of object %s at byte %ld\n",
 381                                 hex, prev_posn);
 382                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 383                 range_header = curl_slist_append(range_header, range);
 384                 curl_easy_setopt(slot->curl,
 385                                  CURLOPT_HTTPHEADER, range_header);
 386         }
 387
 388         /* Try to get the request started, abort the request on error */
 389         request->state = RUN_FETCH_LOOSE;
 390         if (!start_active_slot(slot)) {
 391                 fprintf(stderr, "Unable to start GET request\n");
 392                 remote->can_update_info_refs = 0;
 393                 release_request(request);
 394         }
 395 }
 396
 397 static void start_mkcol(struct transfer_request *request)
 398 {
 399         char *hex = sha1_to_hex(request->obj->sha1);
 400         struct active_request_slot *slot;
 401
 402         request->url = get_remote_object_url(remote->url, hex, 1);
 403
 404         slot = get_active_slot();
 405         slot->callback_func = process_response;
 406         slot->callback_data = request;
 407         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 408         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 409         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 410         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 411         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 412
 413         if (start_active_slot(slot)) {
 414                 request->slot = slot;
 415                 request->state = RUN_MKCOL;
 416         } else {
 417                 request->state = ABORTED;
 418                 free(request->url);
 419                 request->url = NULL;
 420         }
 421 }
 422 #endif
 423
 424 static void start_fetch_packed(struct transfer_request *request)
 425 {
 426         char *url;
 427         struct packed_git *target;
 428         FILE *packfile;
 429         char *filename;
 430         long prev_posn = 0;
 431         char range[RANGE_HEADER_SIZE];
 432         struct curl_slist *range_header = NULL;
 433
 434         struct transfer_request *check_request = request_queue_head;
 435         struct active_request_slot *slot;
 436
 437         target = find_sha1_pack(request->obj->sha1, remote->packs);
 438         if (!target) {
 439                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 440                 remote->can_update_info_refs = 0;
 441                 release_request(request);
 442                 return;
 443         }
 444
 445         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 446         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 447
 448         filename = sha1_pack_name(target->sha1);
 449         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 450         snprintf(request->tmpfile, sizeof(request->tmpfile),
 451                  "%s.temp", filename);
 452
 453         url = xmalloc(strlen(remote->url) + 64);
 454         sprintf(url, "%sobjects/pack/pack-%s.pack",
 455                 remote->url, sha1_to_hex(target->sha1));
 456
 457         /* Make sure there isn't another open request for this pack */
 458         while (check_request) {
 459                 if (check_request->state == RUN_FETCH_PACKED &&
 460                     !strcmp(check_request->url, url)) {
 461                         free(url);
 462                         release_request(request);
 463                         return;
 464                 }
 465                 check_request = check_request->next;
 466         }
 467
 468         packfile = fopen(request->tmpfile, "a");
 469         if (!packfile) {
 470                 fprintf(stderr, "Unable to open local file %s for pack",
 471                         request->tmpfile);
 472                 remote->can_update_info_refs = 0;
 473                 free(url);
 474                 return;
 475         }
 476
 477         slot = get_active_slot();
 478         slot->callback_func = process_response;
 479         slot->callback_data = request;
 480         request->slot = slot;
 481         request->local_stream = packfile;
 482         request->userData = target;
 483
 484         request->url = url;
 485         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 486         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 487         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 488         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 489         slot->local = packfile;
 490
 491         /* If there is data present from a previous transfer attempt,
 492            resume where it left off */
 493         prev_posn = ftell(packfile);
 494         if (prev_posn>0) {
 495                 if (push_verbosely)
 496                         fprintf(stderr,
 497                                 "Resuming fetch of pack %s at byte %ld\n",
 498                                 sha1_to_hex(target->sha1), prev_posn);
 499                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 500                 range_header = curl_slist_append(range_header, range);
 501                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 502         }
 503
 504         /* Try to get the request started, abort the request on error */
 505         request->state = RUN_FETCH_PACKED;
 506         if (!start_active_slot(slot)) {
 507                 fprintf(stderr, "Unable to start GET request\n");
 508                 remote->can_update_info_refs = 0;
 509                 release_request(request);
 510         }
 511 }
 512
 513 static void start_put(struct transfer_request *request)
 514 {
 515         char *hex = sha1_to_hex(request->obj->sha1);
 516         struct active_request_slot *slot;
 517         struct strbuf buf = STRBUF_INIT;
 518         enum object_type type;
 519         char hdr[50];
 520         void *unpacked;
 521         unsigned long len;
 522         int hdrlen;
 523         ssize_t size;
 524         z_stream stream;
 525
 526         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 527         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 528
 529         /* Set it up */
 530         memset(&stream, 0, sizeof(stream));
 531         deflateInit(&stream, zlib_compression_level);
 532         size = deflateBound(&stream, len + hdrlen);
 533         strbuf_init(&request->buffer.buf, size);
 534         request->buffer.posn = 0;
 535
 536         /* Compress it */
 537         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 538         stream.avail_out = size;
 539
 540         /* First header.. */
 541         stream.next_in = (void *)hdr;
 542         stream.avail_in = hdrlen;
 543         while (deflate(&stream, 0) == Z_OK)
 544                 /* nothing */;
 545
 546         /* Then the data itself.. */
 547         stream.next_in = unpacked;
 548         stream.avail_in = len;
 549         while (deflate(&stream, Z_FINISH) == Z_OK)
 550                 /* nothing */;
 551         deflateEnd(&stream);
 552         free(unpacked);
 553
 554         request->buffer.buf.len = stream.total_out;
 555
 556         strbuf_addstr(&buf, "Destination: ");
 557         append_remote_object_url(&buf, remote->url, hex, 0);
 558         request->dest = strbuf_detach(&buf, NULL);
 559
 560         append_remote_object_url(&buf, remote->url, hex, 0);
 561         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 562         request->url = strbuf_detach(&buf, NULL);
 563
 564         slot = get_active_slot();
 565         slot->callback_func = process_response;
 566         slot->callback_data = request;
 567         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 568         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 569         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 571         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 572         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 573         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 574         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 575         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 576
 577         if (start_active_slot(slot)) {
 578                 request->slot = slot;
 579                 request->state = RUN_PUT;
 580         } else {
 581                 request->state = ABORTED;
 582                 free(request->url);
 583                 request->url = NULL;
 584         }
 585 }
 586
 587 static void start_move(struct transfer_request *request)
 588 {
 589         struct active_request_slot *slot;
 590         struct curl_slist *dav_headers = NULL;
 591
 592         slot = get_active_slot();
 593         slot->callback_func = process_response;
 594         slot->callback_data = request;
 595         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 596         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 597         dav_headers = curl_slist_append(dav_headers, request->dest);
 598         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 599         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 600         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 601         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 602
 603         if (start_active_slot(slot)) {
 604                 request->slot = slot;
 605                 request->state = RUN_MOVE;
 606         } else {
 607                 request->state = ABORTED;
 608                 free(request->url);
 609                 request->url = NULL;
 610         }
 611 }
 612
 613 static int refresh_lock(struct remote_lock *lock)
 614 {
 615         struct active_request_slot *slot;
 616         struct slot_results results;
 617         struct curl_slist *dav_headers;
 618         int rc = 0;
 619
 620         lock->refreshing = 1;
 621
 622         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 623
 624         slot = get_active_slot();
 625         slot->results = &results;
 626         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 627         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 628         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 629         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 630         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 631
 632         if (start_active_slot(slot)) {
 633                 run_active_slot(slot);
 634                 if (results.curl_result != CURLE_OK) {
 635                         fprintf(stderr, "LOCK HTTP error %ld\n",
 636                                 results.http_code);
 637                 } else {
 638                         lock->start_time = time(NULL);
 639                         rc = 1;
 640                 }
 641         }
 642
 643         lock->refreshing = 0;
 644         curl_slist_free_all(dav_headers);
 645
 646         return rc;
 647 }
 648
 649 static void check_locks(void)
 650 {
 651         struct remote_lock *lock = remote->locks;
 652         time_t current_time = time(NULL);
 653         int time_remaining;
 654
 655         while (lock) {
 656                 time_remaining = lock->start_time + lock->timeout -
 657                         current_time;
 658                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 659                         if (!refresh_lock(lock)) {
 660                                 fprintf(stderr,
 661                                         "Unable to refresh lock for %s\n",
 662                                         lock->url);
 663                                 aborted = 1;
 664                                 return;
 665                         }
 666                 }
 667                 lock = lock->next;
 668         }
 669 }
 670
 671 static void release_request(struct transfer_request *request)
 672 {
 673         struct transfer_request *entry = request_queue_head;
 674
 675         if (request == request_queue_head) {
 676                 request_queue_head = request->next;
 677         } else {
 678                 while (entry->next != NULL && entry->next != request)
 679                         entry = entry->next;
 680                 if (entry->next == request)
 681                         entry->next = entry->next->next;
 682         }
 683
 684         if (request->local_fileno != -1)
 685                 close(request->local_fileno);
 686         if (request->local_stream)
 687                 fclose(request->local_stream);
 688         free(request->url);
 689         free(request);
 690 }
 691
 692 static void finish_request(struct transfer_request *request)
 693 {
 694         struct stat st;
 695         struct packed_git *target;
 696         struct packed_git **lst;
 697
 698         request->curl_result = request->slot->curl_result;
 699         request->http_code = request->slot->http_code;
 700         request->slot = NULL;
 701
 702         /* Keep locks active */
 703         check_locks();
 704
 705         if (request->headers != NULL)
 706                 curl_slist_free_all(request->headers);
 707
 708         /* URL is reused for MOVE after PUT */
 709         if (request->state != RUN_PUT) {
 710                 free(request->url);
 711                 request->url = NULL;
 712         }
 713
 714         if (request->state == RUN_MKCOL) {
 715                 if (request->curl_result == CURLE_OK ||
 716                     request->http_code == 405) {
 717                         remote_dir_exists[request->obj->sha1[0]] = 1;
 718                         start_put(request);
 719                 } else {
 720                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 721                                 sha1_to_hex(request->obj->sha1),
 722                                 request->curl_result, request->http_code);
 723                         request->state = ABORTED;
 724                         aborted = 1;
 725                 }
 726         } else if (request->state == RUN_PUT) {
 727                 if (request->curl_result == CURLE_OK) {
 728                         start_move(request);
 729                 } else {
 730                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 731                                 sha1_to_hex(request->obj->sha1),
 732                                 request->curl_result, request->http_code);
 733                         request->state = ABORTED;
 734                         aborted = 1;
 735                 }
 736         } else if (request->state == RUN_MOVE) {
 737                 if (request->curl_result == CURLE_OK) {
 738                         if (push_verbosely)
 739                                 fprintf(stderr, "    sent %s\n",
 740                                         sha1_to_hex(request->obj->sha1));
 741                         request->obj->flags |= REMOTE;
 742                         release_request(request);
 743                 } else {
 744                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 745                                 sha1_to_hex(request->obj->sha1),
 746                                 request->curl_result, request->http_code);
 747                         request->state = ABORTED;
 748                         aborted = 1;
 749                 }
 750         } else if (request->state == RUN_FETCH_LOOSE) {
 751                 fchmod(request->local_fileno, 0444);
 752                 close(request->local_fileno); request->local_fileno = -1;
 753
 754                 if (request->curl_result != CURLE_OK &&
 755                     request->http_code != 416) {
 756                         if (stat(request->tmpfile, &st) == 0) {
 757                                 if (st.st_size == 0)
 758                                         unlink(request->tmpfile);
 759                         }
 760                 } else {
 761                         if (request->http_code == 416)
 762                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 763
 764                         git_inflate_end(&request->stream);
 765                         git_SHA1_Final(request->real_sha1, &request->c);
 766                         if (request->zret != Z_STREAM_END) {
 767                                 unlink(request->tmpfile);
 768                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 769                                 unlink(request->tmpfile);
 770                         } else {
 771                                 request->rename =
 772                                         move_temp_to_file(
 773                                                 request->tmpfile,
 774                                                 request->filename);
 775                                 if (request->rename == 0) {
 776                                         request->obj->flags |= (LOCAL | REMOTE);
 777                                 }
 778                         }
 779                 }
 780
 781                 /* Try fetching packed if necessary */
 782                 if (request->obj->flags & LOCAL)
 783                         release_request(request);
 784                 else
 785                         start_fetch_packed(request);
 786
 787         } else if (request->state == RUN_FETCH_PACKED) {
 788                 if (request->curl_result != CURLE_OK) {
 789                         fprintf(stderr, "Unable to get pack file %s\n%s",
 790                                 request->url, curl_errorstr);
 791                         remote->can_update_info_refs = 0;
 792                 } else {
 793                         off_t pack_size = ftell(request->local_stream);
 794
 795                         fclose(request->local_stream);
 796                         request->local_stream = NULL;
 797                         if (!move_temp_to_file(request->tmpfile,
 798                                                request->filename)) {
 799                                 target = (struct packed_git *)request->userData;
 800                                 target->pack_size = pack_size;
 801                                 lst = &remote->packs;
 802                                 while (*lst != target)
 803                                         lst = &((*lst)->next);
 804                                 *lst = (*lst)->next;
 805
 806                                 if (!verify_pack(target))
 807                                         install_packed_git(target);
 808                                 else
 809                                         remote->can_update_info_refs = 0;
 810                         }
 811                 }
 812                 release_request(request);
 813         }
 814 }
 815
 816 #ifdef USE_CURL_MULTI
 817 static int fill_active_slot(void *unused)
 818 {
 819         struct transfer_request *request = request_queue_head;
 820
 821         if (aborted)
 822                 return 0;
 823
 824         for (request = request_queue_head; request; request = request->next) {
 825                 if (request->state == NEED_FETCH) {
 826                         start_fetch_loose(request);
 827                         return 1;
 828                 } else if (pushing && request->state == NEED_PUSH) {
 829                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 830                                 start_put(request);
 831                         } else {
 832                                 start_mkcol(request);
 833                         }
 834                         return 1;
 835                 }
 836         }
 837         return 0;
 838 }
 839 #endif
 840
 841 static void get_remote_object_list(unsigned char parent);
 842
 843 static void add_fetch_request(struct object *obj)
 844 {
 845         struct transfer_request *request;
 846
 847         check_locks();
 848
 849         /*
 850          * Don't fetch the object if it's known to exist locally
 851          * or is already in the request queue
 852          */
 853         if (remote_dir_exists[obj->sha1[0]] == -1)
 854                 get_remote_object_list(obj->sha1[0]);
 855         if (obj->flags & (LOCAL | FETCHING))
 856                 return;
 857
 858         obj->flags |= FETCHING;
 859         request = xmalloc(sizeof(*request));
 860         request->obj = obj;
 861         request->url = NULL;
 862         request->lock = NULL;
 863         request->headers = NULL;
 864         request->local_fileno = -1;
 865         request->local_stream = NULL;
 866         request->state = NEED_FETCH;
 867         request->next = request_queue_head;
 868         request_queue_head = request;
 869
 870 #ifdef USE_CURL_MULTI
 871         fill_active_slots();
 872         step_active_slots();
 873 #endif
 874 }
 875
 876 static int add_send_request(struct object *obj, struct remote_lock *lock)
 877 {
 878         struct transfer_request *request = request_queue_head;
 879         struct packed_git *target;
 880
 881         /* Keep locks active */
 882         check_locks();
 883
 884         /*
 885          * Don't push the object if it's known to exist on the remote
 886          * or is already in the request queue
 887          */
 888         if (remote_dir_exists[obj->sha1[0]] == -1)
 889                 get_remote_object_list(obj->sha1[0]);
 890         if (obj->flags & (REMOTE | PUSHING))
 891                 return 0;
 892         target = find_sha1_pack(obj->sha1, remote->packs);
 893         if (target) {
 894                 obj->flags |= REMOTE;
 895                 return 0;
 896         }
 897
 898         obj->flags |= PUSHING;
 899         request = xmalloc(sizeof(*request));
 900         request->obj = obj;
 901         request->url = NULL;
 902         request->lock = lock;
 903         request->headers = NULL;
 904         request->local_fileno = -1;
 905         request->local_stream = NULL;
 906         request->state = NEED_PUSH;
 907         request->next = request_queue_head;
 908         request_queue_head = request;
 909
 910 #ifdef USE_CURL_MULTI
 911         fill_active_slots();
 912         step_active_slots();
 913 #endif
 914
 915         return 1;
 916 }
 917
 918 static int fetch_index(unsigned char *sha1)
 919 {
 920         char *hex = sha1_to_hex(sha1);
 921         char *filename;
 922         char *url;
 923         char tmpfile[PATH_MAX];
 924         long prev_posn = 0;
 925         char range[RANGE_HEADER_SIZE];
 926         struct curl_slist *range_header = NULL;
 927
 928         FILE *indexfile;
 929         struct active_request_slot *slot;
 930         struct slot_results results;
 931
 932         /* Don't use the index if the pack isn't there */
 933         url = xmalloc(strlen(remote->url) + 64);
 934         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 935         slot = get_active_slot();
 936         slot->results = &results;
 937         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 938         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 939         if (start_active_slot(slot)) {
 940                 run_active_slot(slot);
 941                 if (results.curl_result != CURLE_OK) {
 942                         free(url);
 943                         return error("Unable to verify pack %s is available",
 944                                      hex);
 945                 }
 946         } else {
 947                 free(url);
 948                 return error("Unable to start request");
 949         }
 950
 951         if (has_pack_index(sha1)) {
 952                 free(url);
 953                 return 0;
 954         }
 955
 956         if (push_verbosely)
 957                 fprintf(stderr, "Getting index for pack %s\n", hex);
 958
 959         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 960
 961         filename = sha1_pack_index_name(sha1);
 962         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 963         indexfile = fopen(tmpfile, "a");
 964         if (!indexfile) {
 965                 free(url);
 966                 return error("Unable to open local file %s for pack index",
 967                              tmpfile);
 968         }
 969
 970         slot = get_active_slot();
 971         slot->results = &results;
 972         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 973         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 974         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 975         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 976         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 977         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 978         slot->local = indexfile;
 979
 980         /* If there is data present from a previous transfer attempt,
 981            resume where it left off */
 982         prev_posn = ftell(indexfile);
 983         if (prev_posn>0) {
 984                 if (push_verbosely)
 985                         fprintf(stderr,
 986                                 "Resuming fetch of index for pack %s at byte %ld\n",
 987                                 hex, prev_posn);
 988                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 989                 range_header = curl_slist_append(range_header, range);
 990                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 991         }
 992
 993         if (start_active_slot(slot)) {
 994                 run_active_slot(slot);
 995                 if (results.curl_result != CURLE_OK) {
 996                         free(url);
 997                         fclose(indexfile);
 998                         return error("Unable to get pack index %s\n%s", url,
 999                                      curl_errorstr);
1000                 }
1001         } else {
1002                 free(url);
1003                 fclose(indexfile);
1004                 return error("Unable to start request");
1005         }
1006
1007         free(url);
1008         fclose(indexfile);
1009
1010         return move_temp_to_file(tmpfile, filename);
1011 }
1012
1013 static int setup_index(unsigned char *sha1)
1014 {
1015         struct packed_git *new_pack;
1016
1017         if (fetch_index(sha1))
1018                 return -1;
1019
1020         new_pack = parse_pack_index(sha1);
1021         new_pack->next = remote->packs;
1022         remote->packs = new_pack;
1023         return 0;
1024 }
1025
1026 static int fetch_indices(void)
1027 {
1028         unsigned char sha1[20];
1029         char *url;
1030         struct strbuf buffer = STRBUF_INIT;
1031         char *data;
1032         int i = 0;
1033
1034         struct active_request_slot *slot;
1035         struct slot_results results;
1036
1037         if (push_verbosely)
1038                 fprintf(stderr, "Getting pack list\n");
1039
1040         url = xmalloc(strlen(remote->url) + 20);
1041         sprintf(url, "%sobjects/info/packs", remote->url);
1042
1043         slot = get_active_slot();
1044         slot->results = &results;
1045         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1046         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1047         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1048         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1049         if (start_active_slot(slot)) {
1050                 run_active_slot(slot);
1051                 if (results.curl_result != CURLE_OK) {
1052                         strbuf_release(&buffer);
1053                         free(url);
1054                         if (results.http_code == 404)
1055                                 return 0;
1056                         else
1057                                 return error("%s", curl_errorstr);
1058                 }
1059         } else {
1060                 strbuf_release(&buffer);
1061                 free(url);
1062                 return error("Unable to start request");
1063         }
1064         free(url);
1065
1066         data = buffer.buf;
1067         while (i < buffer.len) {
1068                 switch (data[i]) {
1069                 case 'P':
1070                         i++;
1071                         if (i + 52 < buffer.len &&
1072                             !prefixcmp(data + i, " pack-") &&
1073                             !prefixcmp(data + i + 46, ".pack\n")) {
1074                                 get_sha1_hex(data + i + 6, sha1);
1075                                 setup_index(sha1);
1076                                 i += 51;
1077                                 break;
1078                         }
1079                 default:
1080                         while (data[i] != '\n')
1081                                 i++;
1082                 }
1083                 i++;
1084         }
1085
1086         strbuf_release(&buffer);
1087         return 0;
1088 }
1089
1090 static void one_remote_object(const char *hex)
1091 {
1092         unsigned char sha1[20];
1093         struct object *obj;
1094
1095         if (get_sha1_hex(hex, sha1) != 0)
1096                 return;
1097
1098         obj = lookup_object(sha1);
1099         if (!obj)
1100                 obj = parse_object(sha1);
1101
1102         /* Ignore remote objects that don't exist locally */
1103         if (!obj)
1104                 return;
1105
1106         obj->flags |= REMOTE;
1107         if (!object_list_contains(objects, obj))
1108                 object_list_insert(obj, &objects);
1109 }
1110
1111 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1112 {
1113         int *lock_flags = (int *)ctx->userData;
1114
1115         if (tag_closed) {
1116                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1117                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1118                             (*lock_flags & DAV_PROP_LOCKWR)) {
1119                                 *lock_flags |= DAV_LOCK_OK;
1120                         }
1121                         *lock_flags &= DAV_LOCK_OK;
1122                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1123                         *lock_flags |= DAV_PROP_LOCKWR;
1124                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1125                         *lock_flags |= DAV_PROP_LOCKEX;
1126                 }
1127         }
1128 }
1129
1130 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1131 {
1132         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1133         git_SHA_CTX sha_ctx;
1134         unsigned char lock_token_sha1[20];
1135
1136         if (tag_closed && ctx->cdata) {
1137                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1138                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1139                         strcpy(lock->owner, ctx->cdata);
1140                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1141                         if (!prefixcmp(ctx->cdata, "Second-"))
1142                                 lock->timeout =
1143                                         strtol(ctx->cdata + 7, NULL, 10);
1144                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1145                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1146                         strcpy(lock->token, ctx->cdata);
1147
1148                         git_SHA1_Init(&sha_ctx);
1149                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1150                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
1151
1152                         lock->tmpfile_suffix[0] = '_';
1153                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1154                 }
1155         }
1156 }
1157
1158 static void one_remote_ref(char *refname);
1159
1160 static void
1161 xml_start_tag(void *userData, const char *name, const char **atts)
1162 {
1163         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1164         const char *c = strchr(name, ':');
1165         int new_len;
1166
1167         if (c == NULL)
1168                 c = name;
1169         else
1170                 c++;
1171
1172         new_len = strlen(ctx->name) + strlen(c) + 2;
1173
1174         if (new_len > ctx->len) {
1175                 ctx->name = xrealloc(ctx->name, new_len);
1176                 ctx->len = new_len;
1177         }
1178         strcat(ctx->name, ".");
1179         strcat(ctx->name, c);
1180
1181         free(ctx->cdata);
1182         ctx->cdata = NULL;
1183
1184         ctx->userFunc(ctx, 0);
1185 }
1186
1187 static void
1188 xml_end_tag(void *userData, const char *name)
1189 {
1190         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1191         const char *c = strchr(name, ':');
1192         char *ep;
1193
1194         ctx->userFunc(ctx, 1);
1195
1196         if (c == NULL)
1197                 c = name;
1198         else
1199                 c++;
1200
1201         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1202         *ep = 0;
1203 }
1204
1205 static void
1206 xml_cdata(void *userData, const XML_Char *s, int len)
1207 {
1208         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1209         free(ctx->cdata);
1210         ctx->cdata = xmemdupz(s, len);
1211 }
1212
1213 static struct remote_lock *lock_remote(const char *path, long timeout)
1214 {
1215         struct active_request_slot *slot;
1216         struct slot_results results;
1217         struct buffer out_buffer = { STRBUF_INIT, 0 };
1218         struct strbuf in_buffer = STRBUF_INIT;
1219         char *url;
1220         char *ep;
1221         char timeout_header[25];
1222         struct remote_lock *lock = NULL;
1223         struct curl_slist *dav_headers = NULL;
1224         struct xml_ctx ctx;
1225
1226         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1227         sprintf(url, "%s%s", remote->url, path);
1228
1229         /* Make sure leading directories exist for the remote ref */
1230         ep = strchr(url + strlen(remote->url) + 1, '/');
1231         while (ep) {
1232                 char saved_character = ep[1];
1233                 ep[1] = '\0';
1234                 slot = get_active_slot();
1235                 slot->results = &results;
1236                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1237                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1238                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1239                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1240                 if (start_active_slot(slot)) {
1241                         run_active_slot(slot);
1242                         if (results.curl_result != CURLE_OK &&
1243                             results.http_code != 405) {
1244                                 fprintf(stderr,
1245                                         "Unable to create branch path %s\n",
1246                                         url);
1247                                 free(url);
1248                                 return NULL;
1249                         }
1250                 } else {
1251                         fprintf(stderr, "Unable to start MKCOL request\n");
1252                         free(url);
1253                         return NULL;
1254                 }
1255                 ep[1] = saved_character;
1256                 ep = strchr(ep + 1, '/');
1257         }
1258
1259         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1260
1261         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1262         dav_headers = curl_slist_append(dav_headers, timeout_header);
1263         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1264
1265         slot = get_active_slot();
1266         slot->results = &results;
1267         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1268         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1269         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1270         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1271         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1272         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1273         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1274         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1275         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1276
1277         lock = xcalloc(1, sizeof(*lock));
1278         lock->timeout = -1;
1279
1280         if (start_active_slot(slot)) {
1281                 run_active_slot(slot);
1282                 if (results.curl_result == CURLE_OK) {
1283                         XML_Parser parser = XML_ParserCreate(NULL);
1284                         enum XML_Status result;
1285                         ctx.name = xcalloc(10, 1);
1286                         ctx.len = 0;
1287                         ctx.cdata = NULL;
1288                         ctx.userFunc = handle_new_lock_ctx;
1289                         ctx.userData = lock;
1290                         XML_SetUserData(parser, &ctx);
1291                         XML_SetElementHandler(parser, xml_start_tag,
1292                                               xml_end_tag);
1293                         XML_SetCharacterDataHandler(parser, xml_cdata);
1294                         result = XML_Parse(parser, in_buffer.buf,
1295                                            in_buffer.len, 1);
1296                         free(ctx.name);
1297                         if (result != XML_STATUS_OK) {
1298                                 fprintf(stderr, "XML error: %s\n",
1299                                         XML_ErrorString(
1300                                                 XML_GetErrorCode(parser)));
1301                                 lock->timeout = -1;
1302                         }
1303                         XML_ParserFree(parser);
1304                 }
1305         } else {
1306                 fprintf(stderr, "Unable to start LOCK request\n");
1307         }
1308
1309         curl_slist_free_all(dav_headers);
1310         strbuf_release(&out_buffer.buf);
1311         strbuf_release(&in_buffer);
1312
1313         if (lock->token == NULL || lock->timeout <= 0) {
1314                 free(lock->token);
1315                 free(lock->owner);
1316                 free(url);
1317                 free(lock);
1318                 lock = NULL;
1319         } else {
1320                 lock->url = url;
1321                 lock->start_time = time(NULL);
1322                 lock->next = remote->locks;
1323                 remote->locks = lock;
1324         }
1325
1326         return lock;
1327 }
1328
1329 static int unlock_remote(struct remote_lock *lock)
1330 {
1331         struct active_request_slot *slot;
1332         struct slot_results results;
1333         struct remote_lock *prev = remote->locks;
1334         struct curl_slist *dav_headers;
1335         int rc = 0;
1336
1337         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1338
1339         slot = get_active_slot();
1340         slot->results = &results;
1341         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1342         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1343         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1344         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1345
1346         if (start_active_slot(slot)) {
1347                 run_active_slot(slot);
1348                 if (results.curl_result == CURLE_OK)
1349                         rc = 1;
1350                 else
1351                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1352                                 results.http_code);
1353         } else {
1354                 fprintf(stderr, "Unable to start UNLOCK request\n");
1355         }
1356
1357         curl_slist_free_all(dav_headers);
1358
1359         if (remote->locks == lock) {
1360                 remote->locks = lock->next;
1361         } else {
1362                 while (prev && prev->next != lock)
1363                         prev = prev->next;
1364                 if (prev)
1365                         prev->next = prev->next->next;
1366         }
1367
1368         free(lock->owner);
1369         free(lock->url);
1370         free(lock->token);
1371         free(lock);
1372
1373         return rc;
1374 }
1375
1376 static void remove_locks(void)
1377 {
1378         struct remote_lock *lock = remote->locks;
1379
1380         fprintf(stderr, "Removing remote locks...\n");
1381         while (lock) {
1382                 unlock_remote(lock);
1383                 lock = lock->next;
1384         }
1385 }
1386
1387 static void remove_locks_on_signal(int signo)
1388 {
1389         remove_locks();
1390         sigchain_pop(signo);
1391         raise(signo);
1392 }
1393
1394 static void remote_ls(const char *path, int flags,
1395                       void (*userFunc)(struct remote_ls_ctx *ls),
1396                       void *userData);
1397
1398 static void process_ls_object(struct remote_ls_ctx *ls)
1399 {
1400         unsigned int *parent = (unsigned int *)ls->userData;
1401         char *path = ls->dentry_name;
1402         char *obj_hex;
1403
1404         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1405                 remote_dir_exists[*parent] = 1;
1406                 return;
1407         }
1408
1409         if (strlen(path) != 49)
1410                 return;
1411         path += 8;
1412         obj_hex = xmalloc(strlen(path));
1413         /* NB: path is not null-terminated, can not use strlcpy here */
1414         memcpy(obj_hex, path, 2);
1415         strcpy(obj_hex + 2, path + 3);
1416         one_remote_object(obj_hex);
1417         free(obj_hex);
1418 }
1419
1420 static void process_ls_ref(struct remote_ls_ctx *ls)
1421 {
1422         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1423                 fprintf(stderr, "  %s\n", ls->dentry_name);
1424                 return;
1425         }
1426
1427         if (!(ls->dentry_flags & IS_DIR))
1428                 one_remote_ref(ls->dentry_name);
1429 }
1430
1431 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1432 {
1433         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1434
1435         if (tag_closed) {
1436                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1437                         if (ls->dentry_flags & IS_DIR) {
1438                                 if (ls->flags & PROCESS_DIRS) {
1439                                         ls->userFunc(ls);
1440                                 }
1441                                 if (strcmp(ls->dentry_name, ls->path) &&
1442                                     ls->flags & RECURSIVE) {
1443                                         remote_ls(ls->dentry_name,
1444                                                   ls->flags,
1445                                                   ls->userFunc,
1446                                                   ls->userData);
1447                                 }
1448                         } else if (ls->flags & PROCESS_FILES) {
1449                                 ls->userFunc(ls);
1450                         }
1451                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1452                         char *path = ctx->cdata;
1453                         if (*ctx->cdata == 'h') {
1454                                 path = strstr(path, "//");
1455                                 if (path) {
1456                                         path = strchr(path+2, '/');
1457                                 }
1458                         }
1459                         if (path) {
1460                                 path += remote->path_len;
1461                                 ls->dentry_name = xstrdup(path);
1462                         }
1463                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1464                         ls->dentry_flags |= IS_DIR;
1465                 }
1466         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1467                 free(ls->dentry_name);
1468                 ls->dentry_name = NULL;
1469                 ls->dentry_flags = 0;
1470         }
1471 }
1472
1473 /*
1474  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1475  * should _only_ heed the information from that file, instead of trying to
1476  * determine the refs from the remote file system (badly: it does not even
1477  * know about packed-refs).
1478  */
1479 static void remote_ls(const char *path, int flags,
1480                       void (*userFunc)(struct remote_ls_ctx *ls),
1481                       void *userData)
1482 {
1483         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1484         struct active_request_slot *slot;
1485         struct slot_results results;
1486         struct strbuf in_buffer = STRBUF_INIT;
1487         struct buffer out_buffer = { STRBUF_INIT, 0 };
1488         struct curl_slist *dav_headers = NULL;
1489         struct xml_ctx ctx;
1490         struct remote_ls_ctx ls;
1491
1492         ls.flags = flags;
1493         ls.path = xstrdup(path);
1494         ls.dentry_name = NULL;
1495         ls.dentry_flags = 0;
1496         ls.userData = userData;
1497         ls.userFunc = userFunc;
1498
1499         sprintf(url, "%s%s", remote->url, path);
1500
1501         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1502
1503         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1504         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1505
1506         slot = get_active_slot();
1507         slot->results = &results;
1508         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1509         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1510         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1511         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1512         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1513         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1514         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1515         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1516         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1517
1518         if (start_active_slot(slot)) {
1519                 run_active_slot(slot);
1520                 if (results.curl_result == CURLE_OK) {
1521                         XML_Parser parser = XML_ParserCreate(NULL);
1522                         enum XML_Status result;
1523                         ctx.name = xcalloc(10, 1);
1524                         ctx.len = 0;
1525                         ctx.cdata = NULL;
1526                         ctx.userFunc = handle_remote_ls_ctx;
1527                         ctx.userData = &ls;
1528                         XML_SetUserData(parser, &ctx);
1529                         XML_SetElementHandler(parser, xml_start_tag,
1530                                               xml_end_tag);
1531                         XML_SetCharacterDataHandler(parser, xml_cdata);
1532                         result = XML_Parse(parser, in_buffer.buf,
1533                                            in_buffer.len, 1);
1534                         free(ctx.name);
1535
1536                         if (result != XML_STATUS_OK) {
1537                                 fprintf(stderr, "XML error: %s\n",
1538                                         XML_ErrorString(
1539                                                 XML_GetErrorCode(parser)));
1540                         }
1541                         XML_ParserFree(parser);
1542                 }
1543         } else {
1544                 fprintf(stderr, "Unable to start PROPFIND request\n");
1545         }
1546
1547         free(ls.path);
1548         free(url);
1549         strbuf_release(&out_buffer.buf);
1550         strbuf_release(&in_buffer);
1551         curl_slist_free_all(dav_headers);
1552 }
1553
1554 static void get_remote_object_list(unsigned char parent)
1555 {
1556         char path[] = "objects/XX/";
1557         static const char hex[] = "0123456789abcdef";
1558         unsigned int val = parent;
1559
1560         path[8] = hex[val >> 4];
1561         path[9] = hex[val & 0xf];
1562         remote_dir_exists[val] = 0;
1563         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1564                   process_ls_object, &val);
1565 }
1566
1567 static int locking_available(void)
1568 {
1569         struct active_request_slot *slot;
1570         struct slot_results results;
1571         struct strbuf in_buffer = STRBUF_INIT;
1572         struct buffer out_buffer = { STRBUF_INIT, 0 };
1573         struct curl_slist *dav_headers = NULL;
1574         struct xml_ctx ctx;
1575         int lock_flags = 0;
1576
1577         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1578
1579         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1580         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1581
1582         slot = get_active_slot();
1583         slot->results = &results;
1584         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1585         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1586         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1587         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1588         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1589         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1590         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1591         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1592         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1593
1594         if (start_active_slot(slot)) {
1595                 run_active_slot(slot);
1596                 if (results.curl_result == CURLE_OK) {
1597                         XML_Parser parser = XML_ParserCreate(NULL);
1598                         enum XML_Status result;
1599                         ctx.name = xcalloc(10, 1);
1600                         ctx.len = 0;
1601                         ctx.cdata = NULL;
1602                         ctx.userFunc = handle_lockprop_ctx;
1603                         ctx.userData = &lock_flags;
1604                         XML_SetUserData(parser, &ctx);
1605                         XML_SetElementHandler(parser, xml_start_tag,
1606                                               xml_end_tag);
1607                         result = XML_Parse(parser, in_buffer.buf,
1608                                            in_buffer.len, 1);
1609                         free(ctx.name);
1610
1611                         if (result != XML_STATUS_OK) {
1612                                 fprintf(stderr, "XML error: %s\n",
1613                                         XML_ErrorString(
1614                                                 XML_GetErrorCode(parser)));
1615                                 lock_flags = 0;
1616                         }
1617                         XML_ParserFree(parser);
1618                         if (!lock_flags)
1619                                 error("Error: no DAV locking support on %s",
1620                                       remote->url);
1621
1622                 } else {
1623                         error("Cannot access URL %s, return code %d",
1624                               remote->url, results.curl_result);
1625                         lock_flags = 0;
1626                 }
1627         } else {
1628                 error("Unable to start PROPFIND request on %s", remote->url);
1629         }
1630
1631         strbuf_release(&out_buffer.buf);
1632         strbuf_release(&in_buffer);
1633         curl_slist_free_all(dav_headers);
1634
1635         return lock_flags;
1636 }
1637
1638 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1639 {
1640         struct object_list *entry = xmalloc(sizeof(struct object_list));
1641         entry->item = obj;
1642         entry->next = *p;
1643         *p = entry;
1644         return &entry->next;
1645 }
1646
1647 static struct object_list **process_blob(struct blob *blob,
1648                                          struct object_list **p,
1649                                          struct name_path *path,
1650                                          const char *name)
1651 {
1652         struct object *obj = &blob->object;
1653
1654         obj->flags |= LOCAL;
1655
1656         if (obj->flags & (UNINTERESTING | SEEN))
1657                 return p;
1658
1659         obj->flags |= SEEN;
1660         return add_one_object(obj, p);
1661 }
1662
1663 static struct object_list **process_tree(struct tree *tree,
1664                                          struct object_list **p,
1665                                          struct name_path *path,
1666                                          const char *name)
1667 {
1668         struct object *obj = &tree->object;
1669         struct tree_desc desc;
1670         struct name_entry entry;
1671         struct name_path me;
1672
1673         obj->flags |= LOCAL;
1674
1675         if (obj->flags & (UNINTERESTING | SEEN))
1676                 return p;
1677         if (parse_tree(tree) < 0)
1678                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1679
1680         obj->flags |= SEEN;
1681         name = xstrdup(name);
1682         p = add_one_object(obj, p);
1683         me.up = path;
1684         me.elem = name;
1685         me.elem_len = strlen(name);
1686
1687         init_tree_desc(&desc, tree->buffer, tree->size);
1688
1689         while (tree_entry(&desc, &entry))
1690                 switch (object_type(entry.mode)) {
1691                 case OBJ_TREE:
1692                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1693                         break;
1694                 case OBJ_BLOB:
1695                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1696                         break;
1697                 default:
1698                         /* Subproject commit - not in this repository */
1699                         break;
1700                 }
1701
1702         free(tree->buffer);
1703         tree->buffer = NULL;
1704         return p;
1705 }
1706
1707 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1708 {
1709         int i;
1710         struct commit *commit;
1711         struct object_list **p = &objects;
1712         int count = 0;
1713
1714         while ((commit = get_revision(revs)) != NULL) {
1715                 p = process_tree(commit->tree, p, NULL, "");
1716                 commit->object.flags |= LOCAL;
1717                 if (!(commit->object.flags & UNINTERESTING))
1718                         count += add_send_request(&commit->object, lock);
1719         }
1720
1721         for (i = 0; i < revs->pending.nr; i++) {
1722                 struct object_array_entry *entry = revs->pending.objects + i;
1723                 struct object *obj = entry->item;
1724                 const char *name = entry->name;
1725
1726                 if (obj->flags & (UNINTERESTING | SEEN))
1727                         continue;
1728                 if (obj->type == OBJ_TAG) {
1729                         obj->flags |= SEEN;
1730                         p = add_one_object(obj, p);
1731                         continue;
1732                 }
1733                 if (obj->type == OBJ_TREE) {
1734                         p = process_tree((struct tree *)obj, p, NULL, name);
1735                         continue;
1736                 }
1737                 if (obj->type == OBJ_BLOB) {
1738                         p = process_blob((struct blob *)obj, p, NULL, name);
1739                         continue;
1740                 }
1741                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1742         }
1743
1744         while (objects) {
1745                 if (!(objects->item->flags & UNINTERESTING))
1746                         count += add_send_request(objects->item, lock);
1747                 objects = objects->next;
1748         }
1749
1750         return count;
1751 }
1752
1753 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1754 {
1755         struct active_request_slot *slot;
1756         struct slot_results results;
1757         struct buffer out_buffer = { STRBUF_INIT, 0 };
1758         struct curl_slist *dav_headers;
1759
1760         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1761
1762         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1763
1764         slot = get_active_slot();
1765         slot->results = &results;
1766         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1767         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1768         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1769         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1770         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1771         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1772         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1773         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1774         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1775
1776         if (start_active_slot(slot)) {
1777                 run_active_slot(slot);
1778                 strbuf_release(&out_buffer.buf);
1779                 if (results.curl_result != CURLE_OK) {
1780                         fprintf(stderr,
1781                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1782                                 results.curl_result, results.http_code);
1783                         /* We should attempt recovery? */
1784                         return 0;
1785                 }
1786         } else {
1787                 strbuf_release(&out_buffer.buf);
1788                 fprintf(stderr, "Unable to start PUT request\n");
1789                 return 0;
1790         }
1791
1792         return 1;
1793 }
1794
1795 static struct ref *local_refs, **local_tail;
1796 static struct ref *remote_refs, **remote_tail;
1797
1798 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1799 {
1800         struct ref *ref;
1801         int len = strlen(refname) + 1;
1802         ref = xcalloc(1, sizeof(*ref) + len);
1803         hashcpy(ref->new_sha1, sha1);
1804         memcpy(ref->name, refname, len);
1805         *local_tail = ref;
1806         local_tail = &ref->next;
1807         return 0;
1808 }
1809
1810 static void one_remote_ref(char *refname)
1811 {
1812         struct ref *ref;
1813         struct object *obj;
1814
1815         ref = alloc_ref(refname);
1816
1817         if (http_fetch_ref(remote->url, ref) != 0) {
1818                 fprintf(stderr,
1819                         "Unable to fetch ref %s from %s\n",
1820                         refname, remote->url);
1821                 free(ref);
1822                 return;
1823         }
1824
1825         /*
1826          * Fetch a copy of the object if it doesn't exist locally - it
1827          * may be required for updating server info later.
1828          */
1829         if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1830                 obj = lookup_unknown_object(ref->old_sha1);
1831                 if (obj) {
1832                         fprintf(stderr, "  fetch %s for %s\n",
1833                                 sha1_to_hex(ref->old_sha1), refname);
1834                         add_fetch_request(obj);
1835                 }
1836         }
1837
1838         *remote_tail = ref;
1839         remote_tail = &ref->next;
1840 }
1841
1842 static void get_local_heads(void)
1843 {
1844         local_tail = &local_refs;
1845         for_each_ref(one_local_ref, NULL);
1846 }
1847
1848 static void get_dav_remote_heads(void)
1849 {
1850         remote_tail = &remote_refs;
1851         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1852 }
1853
1854 static int is_zero_sha1(const unsigned char *sha1)
1855 {
1856         int i;
1857
1858         for (i = 0; i < 20; i++) {
1859                 if (*sha1++)
1860                         return 0;
1861         }
1862         return 1;
1863 }
1864
1865 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1866 {
1867         while (list) {
1868                 struct commit_list *temp = list;
1869                 temp->item->object.flags &= ~mark;
1870                 list = temp->next;
1871                 free(temp);
1872         }
1873 }
1874
1875 static int ref_newer(const unsigned char *new_sha1,
1876                      const unsigned char *old_sha1)
1877 {
1878         struct object *o;
1879         struct commit *old, *new;
1880         struct commit_list *list, *used;
1881         int found = 0;
1882
1883         /* Both new and old must be commit-ish and new is descendant of
1884          * old.  Otherwise we require --force.
1885          */
1886         o = deref_tag(parse_object(old_sha1), NULL, 0);
1887         if (!o || o->type != OBJ_COMMIT)
1888                 return 0;
1889         old = (struct commit *) o;
1890
1891         o = deref_tag(parse_object(new_sha1), NULL, 0);
1892         if (!o || o->type != OBJ_COMMIT)
1893                 return 0;
1894         new = (struct commit *) o;
1895
1896         if (parse_commit(new) < 0)
1897                 return 0;
1898
1899         used = list = NULL;
1900         commit_list_insert(new, &list);
1901         while (list) {
1902                 new = pop_most_recent_commit(&list, TMP_MARK);
1903                 commit_list_insert(new, &used);
1904                 if (new == old) {
1905                         found = 1;
1906                         break;
1907                 }
1908         }
1909         unmark_and_free(list, TMP_MARK);
1910         unmark_and_free(used, TMP_MARK);
1911         return found;
1912 }
1913
1914 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1915 {
1916         struct strbuf *buf = (struct strbuf *)ls->userData;
1917         struct object *o;
1918         int len;
1919         char *ref_info;
1920         struct ref *ref;
1921
1922         ref = alloc_ref(ls->dentry_name);
1923
1924         if (http_fetch_ref(remote->url, ref) != 0) {
1925                 fprintf(stderr,
1926                         "Unable to fetch ref %s from %s\n",
1927                         ls->dentry_name, remote->url);
1928                 aborted = 1;
1929                 free(ref);
1930                 return;
1931         }
1932
1933         o = parse_object(ref->old_sha1);
1934         if (!o) {
1935                 fprintf(stderr,
1936                         "Unable to parse object %s for remote ref %s\n",
1937                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1938                 aborted = 1;
1939                 free(ref);
1940                 return;
1941         }
1942
1943         len = strlen(ls->dentry_name) + 42;
1944         ref_info = xcalloc(len + 1, 1);
1945         sprintf(ref_info, "%s   %s\n",
1946                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1947         fwrite_buffer(ref_info, 1, len, buf);
1948         free(ref_info);
1949
1950         if (o->type == OBJ_TAG) {
1951                 o = deref_tag(o, ls->dentry_name, 0);
1952                 if (o) {
1953                         len = strlen(ls->dentry_name) + 45;
1954                         ref_info = xcalloc(len + 1, 1);
1955                         sprintf(ref_info, "%s   %s^{}\n",
1956                                 sha1_to_hex(o->sha1), ls->dentry_name);
1957                         fwrite_buffer(ref_info, 1, len, buf);
1958                         free(ref_info);
1959                 }
1960         }
1961         free(ref);
1962 }
1963
1964 static void update_remote_info_refs(struct remote_lock *lock)
1965 {
1966         struct buffer buffer = { STRBUF_INIT, 0 };
1967         struct active_request_slot *slot;
1968         struct slot_results results;
1969         struct curl_slist *dav_headers;
1970
1971         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1972                   add_remote_info_ref, &buffer.buf);
1973         if (!aborted) {
1974                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1975
1976                 slot = get_active_slot();
1977                 slot->results = &results;
1978                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1979                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1980                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1981                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1982                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1983                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1984                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1985                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1986                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1987
1988                 if (start_active_slot(slot)) {
1989                         run_active_slot(slot);
1990                         if (results.curl_result != CURLE_OK) {
1991                                 fprintf(stderr,
1992                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1993                                         results.curl_result, results.http_code);
1994                         }
1995                 }
1996         }
1997         strbuf_release(&buffer.buf);
1998 }
1999
2000 static int remote_exists(const char *path)
2001 {
2002         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2003         struct active_request_slot *slot;
2004         struct slot_results results;
2005         int ret = -1;
2006
2007         sprintf(url, "%s%s", remote->url, path);
2008
2009         slot = get_active_slot();
2010         slot->results = &results;
2011         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2012         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2013
2014         if (start_active_slot(slot)) {
2015                 run_active_slot(slot);
2016                 if (results.http_code == 404)
2017                         ret = 0;
2018                 else if (results.curl_result == CURLE_OK)
2019                         ret = 1;
2020                 else
2021                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2022         } else {
2023                 fprintf(stderr, "Unable to start HEAD request\n");
2024         }
2025
2026         free(url);
2027         return ret;
2028 }
2029
2030 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2031 {
2032         char *url;
2033         struct strbuf buffer = STRBUF_INIT;
2034         struct active_request_slot *slot;
2035         struct slot_results results;
2036
2037         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2038         sprintf(url, "%s%s", remote->url, path);
2039
2040         slot = get_active_slot();
2041         slot->results = &results;
2042         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2043         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2044         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2045         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2046         if (start_active_slot(slot)) {
2047                 run_active_slot(slot);
2048                 if (results.curl_result != CURLE_OK) {
2049                         die("Couldn't get %s for remote symref\n%s",
2050                             url, curl_errorstr);
2051                 }
2052         } else {
2053                 die("Unable to start remote symref request");
2054         }
2055         free(url);
2056
2057         free(*symref);
2058         *symref = NULL;
2059         hashclr(sha1);
2060
2061         if (buffer.len == 0)
2062                 return;
2063
2064         /* If it's a symref, set the refname; otherwise try for a sha1 */
2065         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2066                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2067         } else {
2068                 get_sha1_hex(buffer.buf, sha1);
2069         }
2070
2071         strbuf_release(&buffer);
2072 }
2073
2074 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2075 {
2076         struct commit *head = lookup_commit(head_sha1);
2077         struct commit *branch = lookup_commit(branch_sha1);
2078         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2079
2080         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2081 }
2082
2083 static int delete_remote_branch(char *pattern, int force)
2084 {
2085         struct ref *refs = remote_refs;
2086         struct ref *remote_ref = NULL;
2087         unsigned char head_sha1[20];
2088         char *symref = NULL;
2089         int match;
2090         int patlen = strlen(pattern);
2091         int i;
2092         struct active_request_slot *slot;
2093         struct slot_results results;
2094         char *url;
2095
2096         /* Find the remote branch(es) matching the specified branch name */
2097         for (match = 0; refs; refs = refs->next) {
2098                 char *name = refs->name;
2099                 int namelen = strlen(name);
2100                 if (namelen < patlen ||
2101                     memcmp(name + namelen - patlen, pattern, patlen))
2102                         continue;
2103                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2104                         continue;
2105                 match++;
2106                 remote_ref = refs;
2107         }
2108         if (match == 0)
2109                 return error("No remote branch matches %s", pattern);
2110         if (match != 1)
2111                 return error("More than one remote branch matches %s",
2112                              pattern);
2113
2114         /*
2115          * Remote HEAD must be a symref (not exactly foolproof; a remote
2116          * symlink to a symref will look like a symref)
2117          */
2118         fetch_symref("HEAD", &symref, head_sha1);
2119         if (!symref)
2120                 return error("Remote HEAD is not a symref");
2121
2122         /* Remote branch must not be the remote HEAD */
2123         for (i=0; symref && i<MAXDEPTH; i++) {
2124                 if (!strcmp(remote_ref->name, symref))
2125                         return error("Remote branch %s is the current HEAD",
2126                                      remote_ref->name);
2127                 fetch_symref(symref, &symref, head_sha1);
2128         }
2129
2130         /* Run extra sanity checks if delete is not forced */
2131         if (!force) {
2132                 /* Remote HEAD must resolve to a known object */
2133                 if (symref)
2134                         return error("Remote HEAD symrefs too deep");
2135                 if (is_zero_sha1(head_sha1))
2136                         return error("Unable to resolve remote HEAD");
2137                 if (!has_sha1_file(head_sha1))
2138                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2139
2140                 /* Remote branch must resolve to a known object */
2141                 if (is_zero_sha1(remote_ref->old_sha1))
2142                         return error("Unable to resolve remote branch %s",
2143                                      remote_ref->name);
2144                 if (!has_sha1_file(remote_ref->old_sha1))
2145                         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));
2146
2147                 /* Remote branch must be an ancestor of remote HEAD */
2148                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2149                         return error("The branch '%s' is not an ancestor "
2150                                      "of your current HEAD.\n"
2151                                      "If you are sure you want to delete it,"
2152                                      " run:\n\t'git http-push -D %s %s'",
2153                                      remote_ref->name, remote->url, pattern);
2154                 }
2155         }
2156
2157         /* Send delete request */
2158         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2159         if (dry_run)
2160                 return 0;
2161         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2162         sprintf(url, "%s%s", remote->url, remote_ref->name);
2163         slot = get_active_slot();
2164         slot->results = &results;
2165         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2166         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2167         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2168         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2169         if (start_active_slot(slot)) {
2170                 run_active_slot(slot);
2171                 free(url);
2172                 if (results.curl_result != CURLE_OK)
2173                         return error("DELETE request failed (%d/%ld)\n",
2174                                      results.curl_result, results.http_code);
2175         } else {
2176                 free(url);
2177                 return error("Unable to start DELETE request");
2178         }
2179
2180         return 0;
2181 }
2182
2183 int main(int argc, char **argv)
2184 {
2185         struct transfer_request *request;
2186         struct transfer_request *next_request;
2187         int nr_refspec = 0;
2188         char **refspec = NULL;
2189         struct remote_lock *ref_lock = NULL;
2190         struct remote_lock *info_ref_lock = NULL;
2191         struct rev_info revs;
2192         int delete_branch = 0;
2193         int force_delete = 0;
2194         int objects_to_send;
2195         int rc = 0;
2196         int i;
2197         int new_refs;
2198         struct ref *ref;
2199         char *rewritten_url = NULL;
2200
2201         git_extract_argv0_path(argv[0]);
2202
2203         setup_git_directory();
2204
2205         remote = xcalloc(sizeof(*remote), 1);
2206
2207         argv++;
2208         for (i = 1; i < argc; i++, argv++) {
2209                 char *arg = *argv;
2210
2211                 if (*arg == '-') {
2212                         if (!strcmp(arg, "--all")) {
2213                                 push_all = MATCH_REFS_ALL;
2214                                 continue;
2215                         }
2216                         if (!strcmp(arg, "--force")) {
2217                                 force_all = 1;
2218                                 continue;
2219                         }
2220                         if (!strcmp(arg, "--dry-run")) {
2221                                 dry_run = 1;
2222                                 continue;
2223                         }
2224                         if (!strcmp(arg, "--verbose")) {
2225                                 push_verbosely = 1;
2226                                 continue;
2227                         }
2228                         if (!strcmp(arg, "-d")) {
2229                                 delete_branch = 1;
2230                                 continue;
2231                         }
2232                         if (!strcmp(arg, "-D")) {
2233                                 delete_branch = 1;
2234                                 force_delete = 1;
2235                                 continue;
2236                         }
2237                 }
2238                 if (!remote->url) {
2239                         char *path = strstr(arg, "//");
2240                         remote->url = arg;
2241                         remote->path_len = strlen(arg);
2242                         if (path) {
2243                                 remote->path = strchr(path+2, '/');
2244                                 if (remote->path)
2245                                         remote->path_len = strlen(remote->path);
2246                         }
2247                         continue;
2248                 }
2249                 refspec = argv;
2250                 nr_refspec = argc - i;
2251                 break;
2252         }
2253
2254 #ifndef USE_CURL_MULTI
2255         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2256 #endif
2257
2258         if (!remote->url)
2259                 usage(http_push_usage);
2260
2261         if (delete_branch && nr_refspec != 1)
2262                 die("You must specify only one branch name when deleting a remote branch");
2263
2264         memset(remote_dir_exists, -1, 256);
2265
2266         http_init(NULL);
2267
2268         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2269
2270         if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2271                 rewritten_url = xmalloc(strlen(remote->url)+2);
2272                 strcpy(rewritten_url, remote->url);
2273                 strcat(rewritten_url, "/");
2274                 remote->path = rewritten_url + (remote->path - remote->url);
2275                 remote->path_len++;
2276                 remote->url = rewritten_url;
2277         }
2278
2279         /* Verify DAV compliance/lock support */
2280         if (!locking_available()) {
2281                 rc = 1;
2282                 goto cleanup;
2283         }
2284
2285         sigchain_push_common(remove_locks_on_signal);
2286
2287         /* Check whether the remote has server info files */
2288         remote->can_update_info_refs = 0;
2289         remote->has_info_refs = remote_exists("info/refs");
2290         remote->has_info_packs = remote_exists("objects/info/packs");
2291         if (remote->has_info_refs) {
2292                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2293                 if (info_ref_lock)
2294                         remote->can_update_info_refs = 1;
2295                 else {
2296                         fprintf(stderr, "Error: cannot lock existing info/refs\n");
2297                         rc = 1;
2298                         goto cleanup;
2299                 }
2300         }
2301         if (remote->has_info_packs)
2302                 fetch_indices();
2303
2304         /* Get a list of all local and remote heads to validate refspecs */
2305         get_local_heads();
2306         fprintf(stderr, "Fetching remote heads...\n");
2307         get_dav_remote_heads();
2308
2309         /* Remove a remote branch if -d or -D was specified */
2310         if (delete_branch) {
2311                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2312                         fprintf(stderr, "Unable to delete remote branch %s\n",
2313                                 refspec[0]);
2314                 goto cleanup;
2315         }
2316
2317         /* match them up */
2318         if (!remote_tail)
2319                 remote_tail = &remote_refs;
2320         if (match_refs(local_refs, remote_refs, &remote_tail,
2321                        nr_refspec, (const char **) refspec, push_all)) {
2322                 rc = -1;
2323                 goto cleanup;
2324         }
2325         if (!remote_refs) {
2326                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2327                 rc = 0;
2328                 goto cleanup;
2329         }
2330
2331         new_refs = 0;
2332         for (ref = remote_refs; ref; ref = ref->next) {
2333                 char old_hex[60], *new_hex;
2334                 const char *commit_argv[4];
2335                 int commit_argc;
2336                 char *new_sha1_hex, *old_sha1_hex;
2337
2338                 if (!ref->peer_ref)
2339                         continue;
2340
2341                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2342                         if (delete_remote_branch(ref->name, 1) == -1) {
2343                                 error("Could not remove %s", ref->name);
2344                                 rc = -4;
2345                         }
2346                         new_refs++;
2347                         continue;
2348                 }
2349
2350                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2351                         if (push_verbosely || 1)
2352                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2353                         continue;
2354                 }
2355
2356                 if (!force_all &&
2357                     !is_zero_sha1(ref->old_sha1) &&
2358                     !ref->force) {
2359                         if (!has_sha1_file(ref->old_sha1) ||
2360                             !ref_newer(ref->peer_ref->new_sha1,
2361                                        ref->old_sha1)) {
2362                                 /*
2363                                  * We do not have the remote ref, or
2364                                  * we know that the remote ref is not
2365                                  * an ancestor of what we are trying to
2366                                  * push.  Either way this can be losing
2367                                  * commits at the remote end and likely
2368                                  * we were not up to date to begin with.
2369                                  */
2370                                 error("remote '%s' is not an ancestor of\n"
2371                                       "local '%s'.\n"
2372                                       "Maybe you are not up-to-date and "
2373                                       "need to pull first?",
2374                                       ref->name,
2375                                       ref->peer_ref->name);
2376                                 rc = -2;
2377                                 continue;
2378                         }
2379                 }
2380                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2381                 new_refs++;
2382                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2383                 new_hex = sha1_to_hex(ref->new_sha1);
2384
2385                 fprintf(stderr, "updating '%s'", ref->name);
2386                 if (strcmp(ref->name, ref->peer_ref->name))
2387                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2388                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2389                 if (dry_run)
2390                         continue;
2391
2392                 /* Lock remote branch ref */
2393                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2394                 if (ref_lock == NULL) {
2395                         fprintf(stderr, "Unable to lock remote branch %s\n",
2396                                 ref->name);
2397                         rc = 1;
2398                         continue;
2399                 }
2400
2401                 /* Set up revision info for this refspec */
2402                 commit_argc = 3;
2403                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2404                 old_sha1_hex = NULL;
2405                 commit_argv[1] = "--objects";
2406                 commit_argv[2] = new_sha1_hex;
2407                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2408                         old_sha1_hex = xmalloc(42);
2409                         sprintf(old_sha1_hex, "^%s",
2410                                 sha1_to_hex(ref->old_sha1));
2411                         commit_argv[3] = old_sha1_hex;
2412                         commit_argc++;
2413                 }
2414                 init_revisions(&revs, setup_git_directory());
2415                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2416                 revs.edge_hint = 0; /* just in case */
2417                 free(new_sha1_hex);
2418                 if (old_sha1_hex) {
2419                         free(old_sha1_hex);
2420                         commit_argv[1] = NULL;
2421                 }
2422
2423                 /* Generate a list of objects that need to be pushed */
2424                 pushing = 0;
2425                 if (prepare_revision_walk(&revs))
2426                         die("revision walk setup failed");
2427                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2428                 objects_to_send = get_delta(&revs, ref_lock);
2429                 finish_all_active_slots();
2430
2431                 /* Push missing objects to remote, this would be a
2432                    convenient time to pack them first if appropriate. */
2433                 pushing = 1;
2434                 if (objects_to_send)
2435                         fprintf(stderr, "    sending %d objects\n",
2436                                 objects_to_send);
2437 #ifdef USE_CURL_MULTI
2438                 fill_active_slots();
2439                 add_fill_function(NULL, fill_active_slot);
2440 #endif
2441                 do {
2442                         finish_all_active_slots();
2443 #ifdef USE_CURL_MULTI
2444                         fill_active_slots();
2445 #endif
2446                 } while (request_queue_head && !aborted);
2447
2448                 /* Update the remote branch if all went well */
2449                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2450                         rc = 1;
2451
2452                 if (!rc)
2453                         fprintf(stderr, "    done\n");
2454                 unlock_remote(ref_lock);
2455                 check_locks();
2456         }
2457
2458         /* Update remote server info if appropriate */
2459         if (remote->has_info_refs && new_refs) {
2460                 if (info_ref_lock && remote->can_update_info_refs) {
2461                         fprintf(stderr, "Updating remote server info\n");
2462                         if (!dry_run)
2463                                 update_remote_info_refs(info_ref_lock);
2464                 } else {
2465                         fprintf(stderr, "Unable to update server info\n");
2466                 }
2467         }
2468
2469  cleanup:
2470         free(rewritten_url);
2471         if (info_ref_lock)
2472                 unlock_remote(info_ref_lock);
2473         free(remote);
2474
2475         curl_slist_free_all(no_pragma_header);
2476
2477         http_cleanup();
2478
2479         request = request_queue_head;
2480         while (request != NULL) {
2481                 next_request = request->next;
2482                 release_request(request);
2483                 request = next_request;
2484         }
2485
2486         return rc;
2487 }