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