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