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