http-push.c

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