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                 close(request->local_fileno); request->local_fileno = -1;
 752
 753                 if (request->curl_result != CURLE_OK &&
 754                     request->http_code != 416) {
 755                         if (stat(request->tmpfile, &st) == 0) {
 756                                 if (st.st_size == 0)
 757                                         unlink(request->tmpfile);
 758                         }
 759                 } else {
 760                         if (request->http_code == 416)
 761                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 762
 763                         git_inflate_end(&request->stream);
 764                         git_SHA1_Final(request->real_sha1, &request->c);
 765                         if (request->zret != Z_STREAM_END) {
 766                                 unlink(request->tmpfile);
 767                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 768                                 unlink(request->tmpfile);
 769                         } else {
 770                                 request->rename =
 771                                         move_temp_to_file(
 772                                                 request->tmpfile,
 773                                                 request->filename);
 774                                 if (request->rename == 0) {
 775                                         request->obj->flags |= (LOCAL | REMOTE);
 776                                 }
 777                         }
 778                 }
 779
 780                 /* Try fetching packed if necessary */
 781                 if (request->obj->flags & LOCAL)
 782                         release_request(request);
 783                 else
 784                         start_fetch_packed(request);
 785
 786         } else if (request->state == RUN_FETCH_PACKED) {
 787                 if (request->curl_result != CURLE_OK) {
 788                         fprintf(stderr, "Unable to get pack file %s\n%s",
 789                                 request->url, curl_errorstr);
 790                         remote->can_update_info_refs = 0;
 791                 } else {
 792                         off_t pack_size = ftell(request->local_stream);
 793
 794                         fclose(request->local_stream);
 795                         request->local_stream = NULL;
 796                         if (!move_temp_to_file(request->tmpfile,
 797                                                request->filename)) {
 798                                 target = (struct packed_git *)request->userData;
 799                                 target->pack_size = pack_size;
 800                                 lst = &remote->packs;
 801                                 while (*lst != target)
 802                                         lst = &((*lst)->next);
 803                                 *lst = (*lst)->next;
 804
 805                                 if (!verify_pack(target))
 806                                         install_packed_git(target);
 807                                 else
 808                                         remote->can_update_info_refs = 0;
 809                         }
 810                 }
 811                 release_request(request);
 812         }
 813 }
 814
 815 #ifdef USE_CURL_MULTI
 816 static int fill_active_slot(void *unused)
 817 {
 818         struct transfer_request *request = request_queue_head;
 819
 820         if (aborted)
 821                 return 0;
 822
 823         for (request = request_queue_head; request; request = request->next) {
 824                 if (request->state == NEED_FETCH) {
 825                         start_fetch_loose(request);
 826                         return 1;
 827                 } else if (pushing && request->state == NEED_PUSH) {
 828                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 829                                 start_put(request);
 830                         } else {
 831                                 start_mkcol(request);
 832                         }
 833                         return 1;
 834                 }
 835         }
 836         return 0;
 837 }
 838 #endif
 839
 840 static void get_remote_object_list(unsigned char parent);
 841
 842 static void add_fetch_request(struct object *obj)
 843 {
 844         struct transfer_request *request;
 845
 846         check_locks();
 847
 848         /*
 849          * Don't fetch the object if it's known to exist locally
 850          * or is already in the request queue
 851          */
 852         if (remote_dir_exists[obj->sha1[0]] == -1)
 853                 get_remote_object_list(obj->sha1[0]);
 854         if (obj->flags & (LOCAL | FETCHING))
 855                 return;
 856
 857         obj->flags |= FETCHING;
 858         request = xmalloc(sizeof(*request));
 859         request->obj = obj;
 860         request->url = NULL;
 861         request->lock = NULL;
 862         request->headers = NULL;
 863         request->local_fileno = -1;
 864         request->local_stream = NULL;
 865         request->state = NEED_FETCH;
 866         request->next = request_queue_head;
 867         request_queue_head = request;
 868
 869 #ifdef USE_CURL_MULTI
 870         fill_active_slots();
 871         step_active_slots();
 872 #endif
 873 }
 874
 875 static int add_send_request(struct object *obj, struct remote_lock *lock)
 876 {
 877         struct transfer_request *request = request_queue_head;
 878         struct packed_git *target;
 879
 880         /* Keep locks active */
 881         check_locks();
 882
 883         /*
 884          * Don't push the object if it's known to exist on the remote
 885          * or is already in the request queue
 886          */
 887         if (remote_dir_exists[obj->sha1[0]] == -1)
 888                 get_remote_object_list(obj->sha1[0]);
 889         if (obj->flags & (REMOTE | PUSHING))
 890                 return 0;
 891         target = find_sha1_pack(obj->sha1, remote->packs);
 892         if (target) {
 893                 obj->flags |= REMOTE;
 894                 return 0;
 895         }
 896
 897         obj->flags |= PUSHING;
 898         request = xmalloc(sizeof(*request));
 899         request->obj = obj;
 900         request->url = NULL;
 901         request->lock = lock;
 902         request->headers = NULL;
 903         request->local_fileno = -1;
 904         request->local_stream = NULL;
 905         request->state = NEED_PUSH;
 906         request->next = request_queue_head;
 907         request_queue_head = request;
 908
 909 #ifdef USE_CURL_MULTI
 910         fill_active_slots();
 911         step_active_slots();
 912 #endif
 913
 914         return 1;
 915 }
 916
 917 static int fetch_index(unsigned char *sha1)
 918 {
 919         char *hex = sha1_to_hex(sha1);
 920         char *filename;
 921         char *url;
 922         char tmpfile[PATH_MAX];
 923         long prev_posn = 0;
 924         char range[RANGE_HEADER_SIZE];
 925         struct curl_slist *range_header = NULL;
 926
 927         FILE *indexfile;
 928         struct active_request_slot *slot;
 929         struct slot_results results;
 930
 931         /* Don't use the index if the pack isn't there */
 932         url = xmalloc(strlen(remote->url) + 64);
 933         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 934         slot = get_active_slot();
 935         slot->results = &results;
 936         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 937         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 938         if (start_active_slot(slot)) {
 939                 run_active_slot(slot);
 940                 if (results.curl_result != CURLE_OK) {
 941                         free(url);
 942                         return error("Unable to verify pack %s is available",
 943                                      hex);
 944                 }
 945         } else {
 946                 free(url);
 947                 return error("Unable to start request");
 948         }
 949
 950         if (has_pack_index(sha1)) {
 951                 free(url);
 952                 return 0;
 953         }
 954
 955         if (push_verbosely)
 956                 fprintf(stderr, "Getting index for pack %s\n", hex);
 957
 958         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 959
 960         filename = sha1_pack_index_name(sha1);
 961         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 962         indexfile = fopen(tmpfile, "a");
 963         if (!indexfile) {
 964                 free(url);
 965                 return error("Unable to open local file %s for pack index",
 966                              tmpfile);
 967         }
 968
 969         slot = get_active_slot();
 970         slot->results = &results;
 971         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 972         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 973         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 974         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 975         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 976         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 977         slot->local = indexfile;
 978
 979         /* If there is data present from a previous transfer attempt,
 980            resume where it left off */
 981         prev_posn = ftell(indexfile);
 982         if (prev_posn>0) {
 983                 if (push_verbosely)
 984                         fprintf(stderr,
 985                                 "Resuming fetch of index for pack %s at byte %ld\n",
 986                                 hex, prev_posn);
 987                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 988                 range_header = curl_slist_append(range_header, range);
 989                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 990         }
 991
 992         if (start_active_slot(slot)) {
 993                 run_active_slot(slot);
 994                 if (results.curl_result != CURLE_OK) {
 995                         free(url);
 996                         fclose(indexfile);
 997                         return error("Unable to get pack index %s\n%s", url,
 998                                      curl_errorstr);
 999                 }
1000         } else {
1001                 free(url);
1002                 fclose(indexfile);
1003                 return error("Unable to start request");
1004         }
1005
1006         free(url);
1007         fclose(indexfile);
1008
1009         return move_temp_to_file(tmpfile, filename);
1010 }
1011
1012 static int setup_index(unsigned char *sha1)
1013 {
1014         struct packed_git *new_pack;
1015
1016         if (fetch_index(sha1))
1017                 return -1;
1018
1019         new_pack = parse_pack_index(sha1);
1020         new_pack->next = remote->packs;
1021         remote->packs = new_pack;
1022         return 0;
1023 }
1024
1025 static int fetch_indices(void)
1026 {
1027         unsigned char sha1[20];
1028         char *url;
1029         struct strbuf buffer = STRBUF_INIT;
1030         char *data;
1031         int i = 0;
1032
1033         struct active_request_slot *slot;
1034         struct slot_results results;
1035
1036         if (push_verbosely)
1037                 fprintf(stderr, "Getting pack list\n");
1038
1039         url = xmalloc(strlen(remote->url) + 20);
1040         sprintf(url, "%sobjects/info/packs", remote->url);
1041
1042         slot = get_active_slot();
1043         slot->results = &results;
1044         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1045         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1046         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1047         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1048         if (start_active_slot(slot)) {
1049                 run_active_slot(slot);
1050                 if (results.curl_result != CURLE_OK) {
1051                         strbuf_release(&buffer);
1052                         free(url);
1053                         if (results.http_code == 404)
1054                                 return 0;
1055                         else
1056                                 return error("%s", curl_errorstr);
1057                 }
1058         } else {
1059                 strbuf_release(&buffer);
1060                 free(url);
1061                 return error("Unable to start request");
1062         }
1063         free(url);
1064
1065         data = buffer.buf;
1066         while (i < buffer.len) {
1067                 switch (data[i]) {
1068                 case 'P':
1069                         i++;
1070                         if (i + 52 < buffer.len &&
1071                             !prefixcmp(data + i, " pack-") &&
1072                             !prefixcmp(data + i + 46, ".pack\n")) {
1073                                 get_sha1_hex(data + i + 6, sha1);
1074                                 setup_index(sha1);
1075                                 i += 51;
1076                                 break;
1077                         }
1078                 default:
1079                         while (data[i] != '\n')
1080                                 i++;
1081                 }
1082                 i++;
1083         }
1084
1085         strbuf_release(&buffer);
1086         return 0;
1087 }
1088
1089 static void one_remote_object(const char *hex)
1090 {
1091         unsigned char sha1[20];
1092         struct object *obj;
1093
1094         if (get_sha1_hex(hex, sha1) != 0)
1095                 return;
1096
1097         obj = lookup_object(sha1);
1098         if (!obj)
1099                 obj = parse_object(sha1);
1100
1101         /* Ignore remote objects that don't exist locally */
1102         if (!obj)
1103                 return;
1104
1105         obj->flags |= REMOTE;
1106         if (!object_list_contains(objects, obj))
1107                 object_list_insert(obj, &objects);
1108 }
1109
1110 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1111 {
1112         int *lock_flags = (int *)ctx->userData;
1113
1114         if (tag_closed) {
1115                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1116                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1117                             (*lock_flags & DAV_PROP_LOCKWR)) {
1118                                 *lock_flags |= DAV_LOCK_OK;
1119                         }
1120                         *lock_flags &= DAV_LOCK_OK;
1121                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1122                         *lock_flags |= DAV_PROP_LOCKWR;
1123                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1124                         *lock_flags |= DAV_PROP_LOCKEX;
1125                 }
1126         }
1127 }
1128
1129 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1130 {
1131         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1132         git_SHA_CTX sha_ctx;
1133         unsigned char lock_token_sha1[20];
1134
1135         if (tag_closed && ctx->cdata) {
1136                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1137                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1138                         strcpy(lock->owner, ctx->cdata);
1139                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1140                         if (!prefixcmp(ctx->cdata, "Second-"))
1141                                 lock->timeout =
1142                                         strtol(ctx->cdata + 7, NULL, 10);
1143                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1144                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1145                         strcpy(lock->token, ctx->cdata);
1146
1147                         git_SHA1_Init(&sha_ctx);
1148                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1149                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
1150
1151                         lock->tmpfile_suffix[0] = '_';
1152                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1153                 }
1154         }
1155 }
1156
1157 static void one_remote_ref(char *refname);
1158
1159 static void
1160 xml_start_tag(void *userData, const char *name, const char **atts)
1161 {
1162         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1163         const char *c = strchr(name, ':');
1164         int new_len;
1165
1166         if (c == NULL)
1167                 c = name;
1168         else
1169                 c++;
1170
1171         new_len = strlen(ctx->name) + strlen(c) + 2;
1172
1173         if (new_len > ctx->len) {
1174                 ctx->name = xrealloc(ctx->name, new_len);
1175                 ctx->len = new_len;
1176         }
1177         strcat(ctx->name, ".");
1178         strcat(ctx->name, c);
1179
1180         free(ctx->cdata);
1181         ctx->cdata = NULL;
1182
1183         ctx->userFunc(ctx, 0);
1184 }
1185
1186 static void
1187 xml_end_tag(void *userData, const char *name)
1188 {
1189         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1190         const char *c = strchr(name, ':');
1191         char *ep;
1192
1193         ctx->userFunc(ctx, 1);
1194
1195         if (c == NULL)
1196                 c = name;
1197         else
1198                 c++;
1199
1200         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1201         *ep = 0;
1202 }
1203
1204 static void
1205 xml_cdata(void *userData, const XML_Char *s, int len)
1206 {
1207         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1208         free(ctx->cdata);
1209         ctx->cdata = xmemdupz(s, len);
1210 }
1211
1212 static struct remote_lock *lock_remote(const char *path, long timeout)
1213 {
1214         struct active_request_slot *slot;
1215         struct slot_results results;
1216         struct buffer out_buffer = { STRBUF_INIT, 0 };
1217         struct strbuf in_buffer = STRBUF_INIT;
1218         char *url;
1219         char *ep;
1220         char timeout_header[25];
1221         struct remote_lock *lock = NULL;
1222         struct curl_slist *dav_headers = NULL;
1223         struct xml_ctx ctx;
1224
1225         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1226         sprintf(url, "%s%s", remote->url, path);
1227
1228         /* Make sure leading directories exist for the remote ref */
1229         ep = strchr(url + strlen(remote->url) + 1, '/');
1230         while (ep) {
1231                 char saved_character = ep[1];
1232                 ep[1] = '\0';
1233                 slot = get_active_slot();
1234                 slot->results = &results;
1235                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1236                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1237                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1238                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1239                 if (start_active_slot(slot)) {
1240                         run_active_slot(slot);
1241                         if (results.curl_result != CURLE_OK &&
1242                             results.http_code != 405) {
1243                                 fprintf(stderr,
1244                                         "Unable to create branch path %s\n",
1245                                         url);
1246                                 free(url);
1247                                 return NULL;
1248                         }
1249                 } else {
1250                         fprintf(stderr, "Unable to start MKCOL request\n");
1251                         free(url);
1252                         return NULL;
1253                 }
1254                 ep[1] = saved_character;
1255                 ep = strchr(ep + 1, '/');
1256         }
1257
1258         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1259
1260         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1261         dav_headers = curl_slist_append(dav_headers, timeout_header);
1262         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1263
1264         slot = get_active_slot();
1265         slot->results = &results;
1266         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1267         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1268         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1269         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1270         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1271         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1272         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1273         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1274         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1275
1276         lock = xcalloc(1, sizeof(*lock));
1277         lock->timeout = -1;
1278
1279         if (start_active_slot(slot)) {
1280                 run_active_slot(slot);
1281                 if (results.curl_result == CURLE_OK) {
1282                         XML_Parser parser = XML_ParserCreate(NULL);
1283                         enum XML_Status result;
1284                         ctx.name = xcalloc(10, 1);
1285                         ctx.len = 0;
1286                         ctx.cdata = NULL;
1287                         ctx.userFunc = handle_new_lock_ctx;
1288                         ctx.userData = lock;
1289                         XML_SetUserData(parser, &ctx);
1290                         XML_SetElementHandler(parser, xml_start_tag,
1291                                               xml_end_tag);
1292                         XML_SetCharacterDataHandler(parser, xml_cdata);
1293                         result = XML_Parse(parser, in_buffer.buf,
1294                                            in_buffer.len, 1);
1295                         free(ctx.name);
1296                         if (result != XML_STATUS_OK) {
1297                                 fprintf(stderr, "XML error: %s\n",
1298                                         XML_ErrorString(
1299                                                 XML_GetErrorCode(parser)));
1300                                 lock->timeout = -1;
1301                         }
1302                         XML_ParserFree(parser);
1303                 }
1304         } else {
1305                 fprintf(stderr, "Unable to start LOCK request\n");
1306         }
1307
1308         curl_slist_free_all(dav_headers);
1309         strbuf_release(&out_buffer.buf);
1310         strbuf_release(&in_buffer);
1311
1312         if (lock->token == NULL || lock->timeout <= 0) {
1313                 free(lock->token);
1314                 free(lock->owner);
1315                 free(url);
1316                 free(lock);
1317                 lock = NULL;
1318         } else {
1319                 lock->url = url;
1320                 lock->start_time = time(NULL);
1321                 lock->next = remote->locks;
1322                 remote->locks = lock;
1323         }
1324
1325         return lock;
1326 }
1327
1328 static int unlock_remote(struct remote_lock *lock)
1329 {
1330         struct active_request_slot *slot;
1331         struct slot_results results;
1332         struct remote_lock *prev = remote->locks;
1333         struct curl_slist *dav_headers;
1334         int rc = 0;
1335
1336         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1337
1338         slot = get_active_slot();
1339         slot->results = &results;
1340         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1341         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1342         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1343         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1344
1345         if (start_active_slot(slot)) {
1346                 run_active_slot(slot);
1347                 if (results.curl_result == CURLE_OK)
1348                         rc = 1;
1349                 else
1350                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1351                                 results.http_code);
1352         } else {
1353                 fprintf(stderr, "Unable to start UNLOCK request\n");
1354         }
1355
1356         curl_slist_free_all(dav_headers);
1357
1358         if (remote->locks == lock) {
1359                 remote->locks = lock->next;
1360         } else {
1361                 while (prev && prev->next != lock)
1362                         prev = prev->next;
1363                 if (prev)
1364                         prev->next = prev->next->next;
1365         }
1366
1367         free(lock->owner);
1368         free(lock->url);
1369         free(lock->token);
1370         free(lock);
1371
1372         return rc;
1373 }
1374
1375 static void remove_locks(void)
1376 {
1377         struct remote_lock *lock = remote->locks;
1378
1379         fprintf(stderr, "Removing remote locks...\n");
1380         while (lock) {
1381                 unlock_remote(lock);
1382                 lock = lock->next;
1383         }
1384 }
1385
1386 static void remove_locks_on_signal(int signo)
1387 {
1388         remove_locks();
1389         sigchain_pop(signo);
1390         raise(signo);
1391 }
1392
1393 static void remote_ls(const char *path, int flags,
1394                       void (*userFunc)(struct remote_ls_ctx *ls),
1395                       void *userData);
1396
1397 static void process_ls_object(struct remote_ls_ctx *ls)
1398 {
1399         unsigned int *parent = (unsigned int *)ls->userData;
1400         char *path = ls->dentry_name;
1401         char *obj_hex;
1402
1403         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1404                 remote_dir_exists[*parent] = 1;
1405                 return;
1406         }
1407
1408         if (strlen(path) != 49)
1409                 return;
1410         path += 8;
1411         obj_hex = xmalloc(strlen(path));
1412         /* NB: path is not null-terminated, can not use strlcpy here */
1413         memcpy(obj_hex, path, 2);
1414         strcpy(obj_hex + 2, path + 3);
1415         one_remote_object(obj_hex);
1416         free(obj_hex);
1417 }
1418
1419 static void process_ls_ref(struct remote_ls_ctx *ls)
1420 {
1421         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1422                 fprintf(stderr, "  %s\n", ls->dentry_name);
1423                 return;
1424         }
1425
1426         if (!(ls->dentry_flags & IS_DIR))
1427                 one_remote_ref(ls->dentry_name);
1428 }
1429
1430 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1431 {
1432         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1433
1434         if (tag_closed) {
1435                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1436                         if (ls->dentry_flags & IS_DIR) {
1437                                 if (ls->flags & PROCESS_DIRS) {
1438                                         ls->userFunc(ls);
1439                                 }
1440                                 if (strcmp(ls->dentry_name, ls->path) &&
1441                                     ls->flags & RECURSIVE) {
1442                                         remote_ls(ls->dentry_name,
1443                                                   ls->flags,
1444                                                   ls->userFunc,
1445                                                   ls->userData);
1446                                 }
1447                         } else if (ls->flags & PROCESS_FILES) {
1448                                 ls->userFunc(ls);
1449                         }
1450                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1451                         char *path = ctx->cdata;
1452                         if (*ctx->cdata == 'h') {
1453                                 path = strstr(path, "//");
1454                                 if (path) {
1455                                         path = strchr(path+2, '/');
1456                                 }
1457                         }
1458                         if (path) {
1459                                 path += remote->path_len;
1460                                 ls->dentry_name = xstrdup(path);
1461                         }
1462                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1463                         ls->dentry_flags |= IS_DIR;
1464                 }
1465         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1466                 free(ls->dentry_name);
1467                 ls->dentry_name = NULL;
1468                 ls->dentry_flags = 0;
1469         }
1470 }
1471
1472 /*
1473  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1474  * should _only_ heed the information from that file, instead of trying to
1475  * determine the refs from the remote file system (badly: it does not even
1476  * know about packed-refs).
1477  */
1478 static void remote_ls(const char *path, int flags,
1479                       void (*userFunc)(struct remote_ls_ctx *ls),
1480                       void *userData)
1481 {
1482         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1483         struct active_request_slot *slot;
1484         struct slot_results results;
1485         struct strbuf in_buffer = STRBUF_INIT;
1486         struct buffer out_buffer = { STRBUF_INIT, 0 };
1487         struct curl_slist *dav_headers = NULL;
1488         struct xml_ctx ctx;
1489         struct remote_ls_ctx ls;
1490
1491         ls.flags = flags;
1492         ls.path = xstrdup(path);
1493         ls.dentry_name = NULL;
1494         ls.dentry_flags = 0;
1495         ls.userData = userData;
1496         ls.userFunc = userFunc;
1497
1498         sprintf(url, "%s%s", remote->url, path);
1499
1500         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1501
1502         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1503         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1504
1505         slot = get_active_slot();
1506         slot->results = &results;
1507         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1508         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1509         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1510         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1511         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1512         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1513         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1514         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1515         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1516
1517         if (start_active_slot(slot)) {
1518                 run_active_slot(slot);
1519                 if (results.curl_result == CURLE_OK) {
1520                         XML_Parser parser = XML_ParserCreate(NULL);
1521                         enum XML_Status result;
1522                         ctx.name = xcalloc(10, 1);
1523                         ctx.len = 0;
1524                         ctx.cdata = NULL;
1525                         ctx.userFunc = handle_remote_ls_ctx;
1526                         ctx.userData = &ls;
1527                         XML_SetUserData(parser, &ctx);
1528                         XML_SetElementHandler(parser, xml_start_tag,
1529                                               xml_end_tag);
1530                         XML_SetCharacterDataHandler(parser, xml_cdata);
1531                         result = XML_Parse(parser, in_buffer.buf,
1532                                            in_buffer.len, 1);
1533                         free(ctx.name);
1534
1535                         if (result != XML_STATUS_OK) {
1536                                 fprintf(stderr, "XML error: %s\n",
1537                                         XML_ErrorString(
1538                                                 XML_GetErrorCode(parser)));
1539                         }
1540                         XML_ParserFree(parser);
1541                 }
1542         } else {
1543                 fprintf(stderr, "Unable to start PROPFIND request\n");
1544         }
1545
1546         free(ls.path);
1547         free(url);
1548         strbuf_release(&out_buffer.buf);
1549         strbuf_release(&in_buffer);
1550         curl_slist_free_all(dav_headers);
1551 }
1552
1553 static void get_remote_object_list(unsigned char parent)
1554 {
1555         char path[] = "objects/XX/";
1556         static const char hex[] = "0123456789abcdef";
1557         unsigned int val = parent;
1558
1559         path[8] = hex[val >> 4];
1560         path[9] = hex[val & 0xf];
1561         remote_dir_exists[val] = 0;
1562         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1563                   process_ls_object, &val);
1564 }
1565
1566 static int locking_available(void)
1567 {
1568         struct active_request_slot *slot;
1569         struct slot_results results;
1570         struct strbuf in_buffer = STRBUF_INIT;
1571         struct buffer out_buffer = { STRBUF_INIT, 0 };
1572         struct curl_slist *dav_headers = NULL;
1573         struct xml_ctx ctx;
1574         int lock_flags = 0;
1575
1576         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1577
1578         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1579         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1580
1581         slot = get_active_slot();
1582         slot->results = &results;
1583         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1584         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1585         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1586         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1587         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1588         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1589         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1590         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1591         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1592
1593         if (start_active_slot(slot)) {
1594                 run_active_slot(slot);
1595                 if (results.curl_result == CURLE_OK) {
1596                         XML_Parser parser = XML_ParserCreate(NULL);
1597                         enum XML_Status result;
1598                         ctx.name = xcalloc(10, 1);
1599                         ctx.len = 0;
1600                         ctx.cdata = NULL;
1601                         ctx.userFunc = handle_lockprop_ctx;
1602                         ctx.userData = &lock_flags;
1603                         XML_SetUserData(parser, &ctx);
1604                         XML_SetElementHandler(parser, xml_start_tag,
1605                                               xml_end_tag);
1606                         result = XML_Parse(parser, in_buffer.buf,
1607                                            in_buffer.len, 1);
1608                         free(ctx.name);
1609
1610                         if (result != XML_STATUS_OK) {
1611                                 fprintf(stderr, "XML error: %s\n",
1612                                         XML_ErrorString(
1613                                                 XML_GetErrorCode(parser)));
1614                                 lock_flags = 0;
1615                         }
1616                         XML_ParserFree(parser);
1617                         if (!lock_flags)
1618                                 error("Error: no DAV locking support on %s",
1619                                       remote->url);
1620
1621                 } else {
1622                         error("Cannot access URL %s, return code %d",
1623                               remote->url, results.curl_result);
1624                         lock_flags = 0;
1625                 }
1626         } else {
1627                 error("Unable to start PROPFIND request on %s", remote->url);
1628         }
1629
1630         strbuf_release(&out_buffer.buf);
1631         strbuf_release(&in_buffer);
1632         curl_slist_free_all(dav_headers);
1633
1634         return lock_flags;
1635 }
1636
1637 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1638 {
1639         struct object_list *entry = xmalloc(sizeof(struct object_list));
1640         entry->item = obj;
1641         entry->next = *p;
1642         *p = entry;
1643         return &entry->next;
1644 }
1645
1646 static struct object_list **process_blob(struct blob *blob,
1647                                          struct object_list **p,
1648                                          struct name_path *path,
1649                                          const char *name)
1650 {
1651         struct object *obj = &blob->object;
1652
1653         obj->flags |= LOCAL;
1654
1655         if (obj->flags & (UNINTERESTING | SEEN))
1656                 return p;
1657
1658         obj->flags |= SEEN;
1659         return add_one_object(obj, p);
1660 }
1661
1662 static struct object_list **process_tree(struct tree *tree,
1663                                          struct object_list **p,
1664                                          struct name_path *path,
1665                                          const char *name)
1666 {
1667         struct object *obj = &tree->object;
1668         struct tree_desc desc;
1669         struct name_entry entry;
1670         struct name_path me;
1671
1672         obj->flags |= LOCAL;
1673
1674         if (obj->flags & (UNINTERESTING | SEEN))
1675                 return p;
1676         if (parse_tree(tree) < 0)
1677                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1678
1679         obj->flags |= SEEN;
1680         name = xstrdup(name);
1681         p = add_one_object(obj, p);
1682         me.up = path;
1683         me.elem = name;
1684         me.elem_len = strlen(name);
1685
1686         init_tree_desc(&desc, tree->buffer, tree->size);
1687
1688         while (tree_entry(&desc, &entry))
1689                 switch (object_type(entry.mode)) {
1690                 case OBJ_TREE:
1691                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1692                         break;
1693                 case OBJ_BLOB:
1694                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1695                         break;
1696                 default:
1697                         /* Subproject commit - not in this repository */
1698                         break;
1699                 }
1700
1701         free(tree->buffer);
1702         tree->buffer = NULL;
1703         return p;
1704 }
1705
1706 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1707 {
1708         int i;
1709         struct commit *commit;
1710         struct object_list **p = &objects;
1711         int count = 0;
1712
1713         while ((commit = get_revision(revs)) != NULL) {
1714                 p = process_tree(commit->tree, p, NULL, "");
1715                 commit->object.flags |= LOCAL;
1716                 if (!(commit->object.flags & UNINTERESTING))
1717                         count += add_send_request(&commit->object, lock);
1718         }
1719
1720         for (i = 0; i < revs->pending.nr; i++) {
1721                 struct object_array_entry *entry = revs->pending.objects + i;
1722                 struct object *obj = entry->item;
1723                 const char *name = entry->name;
1724
1725                 if (obj->flags & (UNINTERESTING | SEEN))
1726                         continue;
1727                 if (obj->type == OBJ_TAG) {
1728                         obj->flags |= SEEN;
1729                         p = add_one_object(obj, p);
1730                         continue;
1731                 }
1732                 if (obj->type == OBJ_TREE) {
1733                         p = process_tree((struct tree *)obj, p, NULL, name);
1734                         continue;
1735                 }
1736                 if (obj->type == OBJ_BLOB) {
1737                         p = process_blob((struct blob *)obj, p, NULL, name);
1738                         continue;
1739                 }
1740                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1741         }
1742
1743         while (objects) {
1744                 if (!(objects->item->flags & UNINTERESTING))
1745                         count += add_send_request(objects->item, lock);
1746                 objects = objects->next;
1747         }
1748
1749         return count;
1750 }
1751
1752 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1753 {
1754         struct active_request_slot *slot;
1755         struct slot_results results;
1756         struct buffer out_buffer = { STRBUF_INIT, 0 };
1757         struct curl_slist *dav_headers;
1758
1759         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1760
1761         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1762
1763         slot = get_active_slot();
1764         slot->results = &results;
1765         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1766         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1767         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1768         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1769         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1770         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1771         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1772         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1773         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1774
1775         if (start_active_slot(slot)) {
1776                 run_active_slot(slot);
1777                 strbuf_release(&out_buffer.buf);
1778                 if (results.curl_result != CURLE_OK) {
1779                         fprintf(stderr,
1780                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1781                                 results.curl_result, results.http_code);
1782                         /* We should attempt recovery? */
1783                         return 0;
1784                 }
1785         } else {
1786                 strbuf_release(&out_buffer.buf);
1787                 fprintf(stderr, "Unable to start PUT request\n");
1788                 return 0;
1789         }
1790
1791         return 1;
1792 }
1793
1794 static struct ref *local_refs, **local_tail;
1795 static struct ref *remote_refs, **remote_tail;
1796
1797 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1798 {
1799         struct ref *ref;
1800         int len = strlen(refname) + 1;
1801         ref = xcalloc(1, sizeof(*ref) + len);
1802         hashcpy(ref->new_sha1, sha1);
1803         memcpy(ref->name, refname, len);
1804         *local_tail = ref;
1805         local_tail = &ref->next;
1806         return 0;
1807 }
1808
1809 static void one_remote_ref(char *refname)
1810 {
1811         struct ref *ref;
1812         struct object *obj;
1813
1814         ref = alloc_ref(refname);
1815
1816         if (http_fetch_ref(remote->url, ref) != 0) {
1817                 fprintf(stderr,
1818                         "Unable to fetch ref %s from %s\n",
1819                         refname, remote->url);
1820                 free(ref);
1821                 return;
1822         }
1823
1824         /*
1825          * Fetch a copy of the object if it doesn't exist locally - it
1826          * may be required for updating server info later.
1827          */
1828         if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1829                 obj = lookup_unknown_object(ref->old_sha1);
1830                 if (obj) {
1831                         fprintf(stderr, "  fetch %s for %s\n",
1832                                 sha1_to_hex(ref->old_sha1), refname);
1833                         add_fetch_request(obj);
1834                 }
1835         }
1836
1837         *remote_tail = ref;
1838         remote_tail = &ref->next;
1839 }
1840
1841 static void get_local_heads(void)
1842 {
1843         local_tail = &local_refs;
1844         for_each_ref(one_local_ref, NULL);
1845 }
1846
1847 static void get_dav_remote_heads(void)
1848 {
1849         remote_tail = &remote_refs;
1850         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1851 }
1852
1853 static int is_zero_sha1(const unsigned char *sha1)
1854 {
1855         int i;
1856
1857         for (i = 0; i < 20; i++) {
1858                 if (*sha1++)
1859                         return 0;
1860         }
1861         return 1;
1862 }
1863
1864 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1865 {
1866         while (list) {
1867                 struct commit_list *temp = list;
1868                 temp->item->object.flags &= ~mark;
1869                 list = temp->next;
1870                 free(temp);
1871         }
1872 }
1873
1874 static int ref_newer(const unsigned char *new_sha1,
1875                      const unsigned char *old_sha1)
1876 {
1877         struct object *o;
1878         struct commit *old, *new;
1879         struct commit_list *list, *used;
1880         int found = 0;
1881
1882         /* Both new and old must be commit-ish and new is descendant of
1883          * old.  Otherwise we require --force.
1884          */
1885         o = deref_tag(parse_object(old_sha1), NULL, 0);
1886         if (!o || o->type != OBJ_COMMIT)
1887                 return 0;
1888         old = (struct commit *) o;
1889
1890         o = deref_tag(parse_object(new_sha1), NULL, 0);
1891         if (!o || o->type != OBJ_COMMIT)
1892                 return 0;
1893         new = (struct commit *) o;
1894
1895         if (parse_commit(new) < 0)
1896                 return 0;
1897
1898         used = list = NULL;
1899         commit_list_insert(new, &list);
1900         while (list) {
1901                 new = pop_most_recent_commit(&list, TMP_MARK);
1902                 commit_list_insert(new, &used);
1903                 if (new == old) {
1904                         found = 1;
1905                         break;
1906                 }
1907         }
1908         unmark_and_free(list, TMP_MARK);
1909         unmark_and_free(used, TMP_MARK);
1910         return found;
1911 }
1912
1913 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1914 {
1915         struct strbuf *buf = (struct strbuf *)ls->userData;
1916         struct object *o;
1917         int len;
1918         char *ref_info;
1919         struct ref *ref;
1920
1921         ref = alloc_ref(ls->dentry_name);
1922
1923         if (http_fetch_ref(remote->url, ref) != 0) {
1924                 fprintf(stderr,
1925                         "Unable to fetch ref %s from %s\n",
1926                         ls->dentry_name, remote->url);
1927                 aborted = 1;
1928                 free(ref);
1929                 return;
1930         }
1931
1932         o = parse_object(ref->old_sha1);
1933         if (!o) {
1934                 fprintf(stderr,
1935                         "Unable to parse object %s for remote ref %s\n",
1936                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1937                 aborted = 1;
1938                 free(ref);
1939                 return;
1940         }
1941
1942         len = strlen(ls->dentry_name) + 42;
1943         ref_info = xcalloc(len + 1, 1);
1944         sprintf(ref_info, "%s   %s\n",
1945                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1946         fwrite_buffer(ref_info, 1, len, buf);
1947         free(ref_info);
1948
1949         if (o->type == OBJ_TAG) {
1950                 o = deref_tag(o, ls->dentry_name, 0);
1951                 if (o) {
1952                         len = strlen(ls->dentry_name) + 45;
1953                         ref_info = xcalloc(len + 1, 1);
1954                         sprintf(ref_info, "%s   %s^{}\n",
1955                                 sha1_to_hex(o->sha1), ls->dentry_name);
1956                         fwrite_buffer(ref_info, 1, len, buf);
1957                         free(ref_info);
1958                 }
1959         }
1960         free(ref);
1961 }
1962
1963 static void update_remote_info_refs(struct remote_lock *lock)
1964 {
1965         struct buffer buffer = { STRBUF_INIT, 0 };
1966         struct active_request_slot *slot;
1967         struct slot_results results;
1968         struct curl_slist *dav_headers;
1969
1970         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1971                   add_remote_info_ref, &buffer.buf);
1972         if (!aborted) {
1973                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1974
1975                 slot = get_active_slot();
1976                 slot->results = &results;
1977                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1978                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1979                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1980                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1981                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1982                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1983                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1984                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1985                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1986
1987                 if (start_active_slot(slot)) {
1988                         run_active_slot(slot);
1989                         if (results.curl_result != CURLE_OK) {
1990                                 fprintf(stderr,
1991                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1992                                         results.curl_result, results.http_code);
1993                         }
1994                 }
1995         }
1996         strbuf_release(&buffer.buf);
1997 }
1998
1999 static int remote_exists(const char *path)
2000 {
2001         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2002         struct active_request_slot *slot;
2003         struct slot_results results;
2004         int ret = -1;
2005
2006         sprintf(url, "%s%s", remote->url, path);
2007
2008         slot = get_active_slot();
2009         slot->results = &results;
2010         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2011         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2012
2013         if (start_active_slot(slot)) {
2014                 run_active_slot(slot);
2015                 if (results.http_code == 404)
2016                         ret = 0;
2017                 else if (results.curl_result == CURLE_OK)
2018                         ret = 1;
2019                 else
2020                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2021         } else {
2022                 fprintf(stderr, "Unable to start HEAD request\n");
2023         }
2024
2025         free(url);
2026         return ret;
2027 }
2028
2029 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2030 {
2031         char *url;
2032         struct strbuf buffer = STRBUF_INIT;
2033         struct active_request_slot *slot;
2034         struct slot_results results;
2035
2036         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2037         sprintf(url, "%s%s", remote->url, path);
2038
2039         slot = get_active_slot();
2040         slot->results = &results;
2041         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2042         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2043         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2044         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2045         if (start_active_slot(slot)) {
2046                 run_active_slot(slot);
2047                 if (results.curl_result != CURLE_OK) {
2048                         die("Couldn't get %s for remote symref\n%s",
2049                             url, curl_errorstr);
2050                 }
2051         } else {
2052                 die("Unable to start remote symref request");
2053         }
2054         free(url);
2055
2056         free(*symref);
2057         *symref = NULL;
2058         hashclr(sha1);
2059
2060         if (buffer.len == 0)
2061                 return;
2062
2063         /* If it's a symref, set the refname; otherwise try for a sha1 */
2064         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2065                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2066         } else {
2067                 get_sha1_hex(buffer.buf, sha1);
2068         }
2069
2070         strbuf_release(&buffer);
2071 }
2072
2073 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2074 {
2075         struct commit *head = lookup_commit(head_sha1);
2076         struct commit *branch = lookup_commit(branch_sha1);
2077         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2078
2079         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2080 }
2081
2082 static int delete_remote_branch(char *pattern, int force)
2083 {
2084         struct ref *refs = remote_refs;
2085         struct ref *remote_ref = NULL;
2086         unsigned char head_sha1[20];
2087         char *symref = NULL;
2088         int match;
2089         int patlen = strlen(pattern);
2090         int i;
2091         struct active_request_slot *slot;
2092         struct slot_results results;
2093         char *url;
2094
2095         /* Find the remote branch(es) matching the specified branch name */
2096         for (match = 0; refs; refs = refs->next) {
2097                 char *name = refs->name;
2098                 int namelen = strlen(name);
2099                 if (namelen < patlen ||
2100                     memcmp(name + namelen - patlen, pattern, patlen))
2101                         continue;
2102                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2103                         continue;
2104                 match++;
2105                 remote_ref = refs;
2106         }
2107         if (match == 0)
2108                 return error("No remote branch matches %s", pattern);
2109         if (match != 1)
2110                 return error("More than one remote branch matches %s",
2111                              pattern);
2112
2113         /*
2114          * Remote HEAD must be a symref (not exactly foolproof; a remote
2115          * symlink to a symref will look like a symref)
2116          */
2117         fetch_symref("HEAD", &symref, head_sha1);
2118         if (!symref)
2119                 return error("Remote HEAD is not a symref");
2120
2121         /* Remote branch must not be the remote HEAD */
2122         for (i=0; symref && i<MAXDEPTH; i++) {
2123                 if (!strcmp(remote_ref->name, symref))
2124                         return error("Remote branch %s is the current HEAD",
2125                                      remote_ref->name);
2126                 fetch_symref(symref, &symref, head_sha1);
2127         }
2128
2129         /* Run extra sanity checks if delete is not forced */
2130         if (!force) {
2131                 /* Remote HEAD must resolve to a known object */
2132                 if (symref)
2133                         return error("Remote HEAD symrefs too deep");
2134                 if (is_zero_sha1(head_sha1))
2135                         return error("Unable to resolve remote HEAD");
2136                 if (!has_sha1_file(head_sha1))
2137                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2138
2139                 /* Remote branch must resolve to a known object */
2140                 if (is_zero_sha1(remote_ref->old_sha1))
2141                         return error("Unable to resolve remote branch %s",
2142                                      remote_ref->name);
2143                 if (!has_sha1_file(remote_ref->old_sha1))
2144                         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));
2145
2146                 /* Remote branch must be an ancestor of remote HEAD */
2147                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2148                         return error("The branch '%s' is not an ancestor "
2149                                      "of your current HEAD.\n"
2150                                      "If you are sure you want to delete it,"
2151                                      " run:\n\t'git http-push -D %s %s'",
2152                                      remote_ref->name, remote->url, pattern);
2153                 }
2154         }
2155
2156         /* Send delete request */
2157         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2158         if (dry_run)
2159                 return 0;
2160         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2161         sprintf(url, "%s%s", remote->url, remote_ref->name);
2162         slot = get_active_slot();
2163         slot->results = &results;
2164         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2165         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2166         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2167         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2168         if (start_active_slot(slot)) {
2169                 run_active_slot(slot);
2170                 free(url);
2171                 if (results.curl_result != CURLE_OK)
2172                         return error("DELETE request failed (%d/%ld)\n",
2173                                      results.curl_result, results.http_code);
2174         } else {
2175                 free(url);
2176                 return error("Unable to start DELETE request");
2177         }
2178
2179         return 0;
2180 }
2181
2182 int main(int argc, char **argv)
2183 {
2184         struct transfer_request *request;
2185         struct transfer_request *next_request;
2186         int nr_refspec = 0;
2187         char **refspec = NULL;
2188         struct remote_lock *ref_lock = NULL;
2189         struct remote_lock *info_ref_lock = NULL;
2190         struct rev_info revs;
2191         int delete_branch = 0;
2192         int force_delete = 0;
2193         int objects_to_send;
2194         int rc = 0;
2195         int i;
2196         int new_refs;
2197         struct ref *ref;
2198         char *rewritten_url = NULL;
2199
2200         git_extract_argv0_path(argv[0]);
2201
2202         setup_git_directory();
2203
2204         remote = xcalloc(sizeof(*remote), 1);
2205
2206         argv++;
2207         for (i = 1; i < argc; i++, argv++) {
2208                 char *arg = *argv;
2209
2210                 if (*arg == '-') {
2211                         if (!strcmp(arg, "--all")) {
2212                                 push_all = MATCH_REFS_ALL;
2213                                 continue;
2214                         }
2215                         if (!strcmp(arg, "--force")) {
2216                                 force_all = 1;
2217                                 continue;
2218                         }
2219                         if (!strcmp(arg, "--dry-run")) {
2220                                 dry_run = 1;
2221                                 continue;
2222                         }
2223                         if (!strcmp(arg, "--verbose")) {
2224                                 push_verbosely = 1;
2225                                 continue;
2226                         }
2227                         if (!strcmp(arg, "-d")) {
2228                                 delete_branch = 1;
2229                                 continue;
2230                         }
2231                         if (!strcmp(arg, "-D")) {
2232                                 delete_branch = 1;
2233                                 force_delete = 1;
2234                                 continue;
2235                         }
2236                 }
2237                 if (!remote->url) {
2238                         char *path = strstr(arg, "//");
2239                         remote->url = arg;
2240                         remote->path_len = strlen(arg);
2241                         if (path) {
2242                                 remote->path = strchr(path+2, '/');
2243                                 if (remote->path)
2244                                         remote->path_len = strlen(remote->path);
2245                         }
2246                         continue;
2247                 }
2248                 refspec = argv;
2249                 nr_refspec = argc - i;
2250                 break;
2251         }
2252
2253 #ifndef USE_CURL_MULTI
2254         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2255 #endif
2256
2257         if (!remote->url)
2258                 usage(http_push_usage);
2259
2260         if (delete_branch && nr_refspec != 1)
2261                 die("You must specify only one branch name when deleting a remote branch");
2262
2263         memset(remote_dir_exists, -1, 256);
2264
2265         http_init(NULL);
2266
2267         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2268
2269         if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2270                 rewritten_url = xmalloc(strlen(remote->url)+2);
2271                 strcpy(rewritten_url, remote->url);
2272                 strcat(rewritten_url, "/");
2273                 remote->path = rewritten_url + (remote->path - remote->url);
2274                 remote->path_len++;
2275                 remote->url = rewritten_url;
2276         }
2277
2278         /* Verify DAV compliance/lock support */
2279         if (!locking_available()) {
2280                 rc = 1;
2281                 goto cleanup;
2282         }
2283
2284         sigchain_push_common(remove_locks_on_signal);
2285
2286         /* Check whether the remote has server info files */
2287         remote->can_update_info_refs = 0;
2288         remote->has_info_refs = remote_exists("info/refs");
2289         remote->has_info_packs = remote_exists("objects/info/packs");
2290         if (remote->has_info_refs) {
2291                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2292                 if (info_ref_lock)
2293                         remote->can_update_info_refs = 1;
2294                 else {
2295                         fprintf(stderr, "Error: cannot lock existing info/refs\n");
2296                         rc = 1;
2297                         goto cleanup;
2298                 }
2299         }
2300         if (remote->has_info_packs)
2301                 fetch_indices();
2302
2303         /* Get a list of all local and remote heads to validate refspecs */
2304         get_local_heads();
2305         fprintf(stderr, "Fetching remote heads...\n");
2306         get_dav_remote_heads();
2307
2308         /* Remove a remote branch if -d or -D was specified */
2309         if (delete_branch) {
2310                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2311                         fprintf(stderr, "Unable to delete remote branch %s\n",
2312                                 refspec[0]);
2313                 goto cleanup;
2314         }
2315
2316         /* match them up */
2317         if (!remote_tail)
2318                 remote_tail = &remote_refs;
2319         if (match_refs(local_refs, remote_refs, &remote_tail,
2320                        nr_refspec, (const char **) refspec, push_all)) {
2321                 rc = -1;
2322                 goto cleanup;
2323         }
2324         if (!remote_refs) {
2325                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2326                 rc = 0;
2327                 goto cleanup;
2328         }
2329
2330         new_refs = 0;
2331         for (ref = remote_refs; ref; ref = ref->next) {
2332                 char old_hex[60], *new_hex;
2333                 const char *commit_argv[4];
2334                 int commit_argc;
2335                 char *new_sha1_hex, *old_sha1_hex;
2336
2337                 if (!ref->peer_ref)
2338                         continue;
2339
2340                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2341                         if (delete_remote_branch(ref->name, 1) == -1) {
2342                                 error("Could not remove %s", ref->name);
2343                                 rc = -4;
2344                         }
2345                         new_refs++;
2346                         continue;
2347                 }
2348
2349                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2350                         if (push_verbosely || 1)
2351                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2352                         continue;
2353                 }
2354
2355                 if (!force_all &&
2356                     !is_zero_sha1(ref->old_sha1) &&
2357                     !ref->force) {
2358                         if (!has_sha1_file(ref->old_sha1) ||
2359                             !ref_newer(ref->peer_ref->new_sha1,
2360                                        ref->old_sha1)) {
2361                                 /*
2362                                  * We do not have the remote ref, or
2363                                  * we know that the remote ref is not
2364                                  * an ancestor of what we are trying to
2365                                  * push.  Either way this can be losing
2366                                  * commits at the remote end and likely
2367                                  * we were not up to date to begin with.
2368                                  */
2369                                 error("remote '%s' is not an ancestor of\n"
2370                                       "local '%s'.\n"
2371                                       "Maybe you are not up-to-date and "
2372                                       "need to pull first?",
2373                                       ref->name,
2374                                       ref->peer_ref->name);
2375                                 rc = -2;
2376                                 continue;
2377                         }
2378                 }
2379                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2380                 new_refs++;
2381                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2382                 new_hex = sha1_to_hex(ref->new_sha1);
2383
2384                 fprintf(stderr, "updating '%s'", ref->name);
2385                 if (strcmp(ref->name, ref->peer_ref->name))
2386                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2387                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2388                 if (dry_run)
2389                         continue;
2390
2391                 /* Lock remote branch ref */
2392                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2393                 if (ref_lock == NULL) {
2394                         fprintf(stderr, "Unable to lock remote branch %s\n",
2395                                 ref->name);
2396                         rc = 1;
2397                         continue;
2398                 }
2399
2400                 /* Set up revision info for this refspec */
2401                 commit_argc = 3;
2402                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2403                 old_sha1_hex = NULL;
2404                 commit_argv[1] = "--objects";
2405                 commit_argv[2] = new_sha1_hex;
2406                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2407                         old_sha1_hex = xmalloc(42);
2408                         sprintf(old_sha1_hex, "^%s",
2409                                 sha1_to_hex(ref->old_sha1));
2410                         commit_argv[3] = old_sha1_hex;
2411                         commit_argc++;
2412                 }
2413                 init_revisions(&revs, setup_git_directory());
2414                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2415                 revs.edge_hint = 0; /* just in case */
2416                 free(new_sha1_hex);
2417                 if (old_sha1_hex) {
2418                         free(old_sha1_hex);
2419                         commit_argv[1] = NULL;
2420                 }
2421
2422                 /* Generate a list of objects that need to be pushed */
2423                 pushing = 0;
2424                 if (prepare_revision_walk(&revs))
2425                         die("revision walk setup failed");
2426                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2427                 objects_to_send = get_delta(&revs, ref_lock);
2428                 finish_all_active_slots();
2429
2430                 /* Push missing objects to remote, this would be a
2431                    convenient time to pack them first if appropriate. */
2432                 pushing = 1;
2433                 if (objects_to_send)
2434                         fprintf(stderr, "    sending %d objects\n",
2435                                 objects_to_send);
2436 #ifdef USE_CURL_MULTI
2437                 fill_active_slots();
2438                 add_fill_function(NULL, fill_active_slot);
2439 #endif
2440                 do {
2441                         finish_all_active_slots();
2442 #ifdef USE_CURL_MULTI
2443                         fill_active_slots();
2444 #endif
2445                 } while (request_queue_head && !aborted);
2446
2447                 /* Update the remote branch if all went well */
2448                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2449                         rc = 1;
2450
2451                 if (!rc)
2452                         fprintf(stderr, "    done\n");
2453                 unlock_remote(ref_lock);
2454                 check_locks();
2455         }
2456
2457         /* Update remote server info if appropriate */
2458         if (remote->has_info_refs && new_refs) {
2459                 if (info_ref_lock && remote->can_update_info_refs) {
2460                         fprintf(stderr, "Updating remote server info\n");
2461                         if (!dry_run)
2462                                 update_remote_info_refs(info_ref_lock);
2463                 } else {
2464                         fprintf(stderr, "Unable to update server info\n");
2465                 }
2466         }
2467
2468  cleanup:
2469         free(rewritten_url);
2470         if (info_ref_lock)
2471                 unlock_remote(info_ref_lock);
2472         free(remote);
2473
2474         curl_slist_free_all(no_pragma_header);
2475
2476         http_cleanup();
2477
2478         request = request_queue_head;
2479         while (request != NULL) {
2480                 next_request = request->next;
2481                 release_request(request);
2482                 request = next_request;
2483         }
2484
2485         return rc;
2486 }