git.oblomov.eu Git - git/blob - http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12
  13 #include <expat.h>
  14
  15 static const char http_push_usage[] =
  16 "git-http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  17
  18 #ifndef XML_STATUS_OK
  19 enum XML_Status {
  20   XML_STATUS_OK = 1,
  21   XML_STATUS_ERROR = 0
  22 };
  23 #define XML_STATUS_OK    1
  24 #define XML_STATUS_ERROR 0
  25 #endif
  26
  27 #define PREV_BUF_SIZE 4096
  28 #define RANGE_HEADER_SIZE 30
  29
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #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>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #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>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing;
  74 static int aborted;
  75 static signed char remote_dir_exists[256];
  76
  77 static struct curl_slist *no_pragma_header;
  78
  79 static int push_verbosely;
  80 static int push_all = MATCH_REFS_NONE;
  81 static int force_all;
  82 static int dry_run;
  83
  84 static struct object_list *objects;
  85
  86 struct repo
  87 {
  88         char *url;
  89         int path_len;
  90         int has_info_refs;
  91         int can_update_info_refs;
  92         int has_info_packs;
  93         struct packed_git *packs;
  94         struct remote_lock *locks;
  95 };
  96
  97 static struct repo *remote;
  98
  99 enum transfer_state {
 100         NEED_FETCH,
 101         RUN_FETCH_LOOSE,
 102         RUN_FETCH_PACKED,
 103         NEED_PUSH,
 104         RUN_MKCOL,
 105         RUN_PUT,
 106         RUN_MOVE,
 107         ABORTED,
 108         COMPLETE,
 109 };
 110
 111 struct transfer_request
 112 {
 113         struct object *obj;
 114         char *url;
 115         char *dest;
 116         struct remote_lock *lock;
 117         struct curl_slist *headers;
 118         struct buffer buffer;
 119         char filename[PATH_MAX];
 120         char tmpfile[PATH_MAX];
 121         int local_fileno;
 122         FILE *local_stream;
 123         enum transfer_state state;
 124         CURLcode curl_result;
 125         char errorstr[CURL_ERROR_SIZE];
 126         long http_code;
 127         unsigned char real_sha1[20];
 128         SHA_CTX c;
 129         z_stream stream;
 130         int zret;
 131         int rename;
 132         void *userData;
 133         struct active_request_slot *slot;
 134         struct transfer_request *next;
 135 };
 136
 137 static struct transfer_request *request_queue_head;
 138
 139 struct xml_ctx
 140 {
 141         char *name;
 142         int len;
 143         char *cdata;
 144         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 145         void *userData;
 146 };
 147
 148 struct remote_lock
 149 {
 150         char *url;
 151         char *owner;
 152         char *token;
 153         time_t start_time;
 154         long timeout;
 155         int refreshing;
 156         struct remote_lock *next;
 157 };
 158
 159 /* Flags that control remote_ls processing */
 160 #define PROCESS_FILES (1u << 0)
 161 #define PROCESS_DIRS  (1u << 1)
 162 #define RECURSIVE     (1u << 2)
 163
 164 /* Flags that remote_ls passes to callback functions */
 165 #define IS_DIR (1u << 0)
 166
 167 struct remote_ls_ctx
 168 {
 169         char *path;
 170         void (*userFunc)(struct remote_ls_ctx *ls);
 171         void *userData;
 172         int flags;
 173         char *dentry_name;
 174         int dentry_flags;
 175         struct remote_ls_ctx *parent;
 176 };
 177
 178 static void finish_request(struct transfer_request *request);
 179 static void release_request(struct transfer_request *request);
 180
 181 static void process_response(void *callback_data)
 182 {
 183         struct transfer_request *request =
 184                 (struct transfer_request *)callback_data;
 185
 186         finish_request(request);
 187 }
 188
 189 #ifdef USE_CURL_MULTI
 190 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 191                                void *data)
 192 {
 193         unsigned char expn[4096];
 194         size_t size = eltsize * nmemb;
 195         int posn = 0;
 196         struct transfer_request *request = (struct transfer_request *)data;
 197         do {
 198                 ssize_t retval = xwrite(request->local_fileno,
 199                                        (char *) ptr + posn, size - posn);
 200                 if (retval < 0)
 201                         return posn;
 202                 posn += retval;
 203         } while (posn < size);
 204
 205         request->stream.avail_in = size;
 206         request->stream.next_in = ptr;
 207         do {
 208                 request->stream.next_out = expn;
 209                 request->stream.avail_out = sizeof(expn);
 210                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 211                 SHA1_Update(&request->c, expn,
 212                             sizeof(expn) - request->stream.avail_out);
 213         } while (request->stream.avail_in && request->zret == Z_OK);
 214         data_received++;
 215         return size;
 216 }
 217
 218 static void start_fetch_loose(struct transfer_request *request)
 219 {
 220         char *hex = sha1_to_hex(request->obj->sha1);
 221         char *filename;
 222         char prevfile[PATH_MAX];
 223         char *url;
 224         char *posn;
 225         int prevlocal;
 226         unsigned char prev_buf[PREV_BUF_SIZE];
 227         ssize_t prev_read = 0;
 228         long prev_posn = 0;
 229         char range[RANGE_HEADER_SIZE];
 230         struct curl_slist *range_header = NULL;
 231         struct active_request_slot *slot;
 232
 233         filename = sha1_file_name(request->obj->sha1);
 234         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 235         snprintf(request->tmpfile, sizeof(request->tmpfile),
 236                  "%s.temp", filename);
 237
 238         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 239         unlink(prevfile);
 240         rename(request->tmpfile, prevfile);
 241         unlink(request->tmpfile);
 242
 243         if (request->local_fileno != -1)
 244                 error("fd leakage in start: %d", request->local_fileno);
 245         request->local_fileno = open(request->tmpfile,
 246                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 247         /* This could have failed due to the "lazy directory creation";
 248          * try to mkdir the last path component.
 249          */
 250         if (request->local_fileno < 0 && errno == ENOENT) {
 251                 char *dir = strrchr(request->tmpfile, '/');
 252                 if (dir) {
 253                         *dir = 0;
 254                         mkdir(request->tmpfile, 0777);
 255                         *dir = '/';
 256                 }
 257                 request->local_fileno = open(request->tmpfile,
 258                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 259         }
 260
 261         if (request->local_fileno < 0) {
 262                 request->state = ABORTED;
 263                 error("Couldn't create temporary file %s for %s: %s",
 264                       request->tmpfile, request->filename, strerror(errno));
 265                 return;
 266         }
 267
 268         memset(&request->stream, 0, sizeof(request->stream));
 269
 270         inflateInit(&request->stream);
 271
 272         SHA1_Init(&request->c);
 273
 274         url = xmalloc(strlen(remote->url) + 50);
 275         request->url = xmalloc(strlen(remote->url) + 50);
 276         strcpy(url, remote->url);
 277         posn = url + strlen(remote->url);
 278         strcpy(posn, "objects/");
 279         posn += 8;
 280         memcpy(posn, hex, 2);
 281         posn += 2;
 282         *(posn++) = '/';
 283         strcpy(posn, hex + 2);
 284         strcpy(request->url, url);
 285
 286         /* If a previous temp file is present, process what was already
 287            fetched. */
 288         prevlocal = open(prevfile, O_RDONLY);
 289         if (prevlocal != -1) {
 290                 do {
 291                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 292                         if (prev_read>0) {
 293                                 if (fwrite_sha1_file(prev_buf,
 294                                                      1,
 295                                                      prev_read,
 296                                                      request) == prev_read) {
 297                                         prev_posn += prev_read;
 298                                 } else {
 299                                         prev_read = -1;
 300                                 }
 301                         }
 302                 } while (prev_read > 0);
 303                 close(prevlocal);
 304         }
 305         unlink(prevfile);
 306
 307         /* Reset inflate/SHA1 if there was an error reading the previous temp
 308            file; also rewind to the beginning of the local file. */
 309         if (prev_read == -1) {
 310                 memset(&request->stream, 0, sizeof(request->stream));
 311                 inflateInit(&request->stream);
 312                 SHA1_Init(&request->c);
 313                 if (prev_posn>0) {
 314                         prev_posn = 0;
 315                         lseek(request->local_fileno, 0, SEEK_SET);
 316                         ftruncate(request->local_fileno, 0);
 317                 }
 318         }
 319
 320         slot = get_active_slot();
 321         slot->callback_func = process_response;
 322         slot->callback_data = request;
 323         request->slot = slot;
 324
 325         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 326         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 327         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 328         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 329         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 330
 331         /* If we have successfully processed data from a previous fetch
 332            attempt, only fetch the data we don't already have. */
 333         if (prev_posn>0) {
 334                 if (push_verbosely)
 335                         fprintf(stderr,
 336                                 "Resuming fetch of object %s at byte %ld\n",
 337                                 hex, prev_posn);
 338                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 339                 range_header = curl_slist_append(range_header, range);
 340                 curl_easy_setopt(slot->curl,
 341                                  CURLOPT_HTTPHEADER, range_header);
 342         }
 343
 344         /* Try to get the request started, abort the request on error */
 345         request->state = RUN_FETCH_LOOSE;
 346         if (!start_active_slot(slot)) {
 347                 fprintf(stderr, "Unable to start GET request\n");
 348                 remote->can_update_info_refs = 0;
 349                 release_request(request);
 350         }
 351 }
 352
 353 static void start_mkcol(struct transfer_request *request)
 354 {
 355         char *hex = sha1_to_hex(request->obj->sha1);
 356         struct active_request_slot *slot;
 357         char *posn;
 358
 359         request->url = xmalloc(strlen(remote->url) + 13);
 360         strcpy(request->url, remote->url);
 361         posn = request->url + strlen(remote->url);
 362         strcpy(posn, "objects/");
 363         posn += 8;
 364         memcpy(posn, hex, 2);
 365         posn += 2;
 366         strcpy(posn, "/");
 367
 368         slot = get_active_slot();
 369         slot->callback_func = process_response;
 370         slot->callback_data = request;
 371         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 372         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 373         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 374         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 375         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 376
 377         if (start_active_slot(slot)) {
 378                 request->slot = slot;
 379                 request->state = RUN_MKCOL;
 380         } else {
 381                 request->state = ABORTED;
 382                 free(request->url);
 383                 request->url = NULL;
 384         }
 385 }
 386 #endif
 387
 388 static void start_fetch_packed(struct transfer_request *request)
 389 {
 390         char *url;
 391         struct packed_git *target;
 392         FILE *packfile;
 393         char *filename;
 394         long prev_posn = 0;
 395         char range[RANGE_HEADER_SIZE];
 396         struct curl_slist *range_header = NULL;
 397
 398         struct transfer_request *check_request = request_queue_head;
 399         struct active_request_slot *slot;
 400
 401         target = find_sha1_pack(request->obj->sha1, remote->packs);
 402         if (!target) {
 403                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 404                 remote->can_update_info_refs = 0;
 405                 release_request(request);
 406                 return;
 407         }
 408
 409         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 410         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 411
 412         filename = sha1_pack_name(target->sha1);
 413         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 414         snprintf(request->tmpfile, sizeof(request->tmpfile),
 415                  "%s.temp", filename);
 416
 417         url = xmalloc(strlen(remote->url) + 64);
 418         sprintf(url, "%sobjects/pack/pack-%s.pack",
 419                 remote->url, sha1_to_hex(target->sha1));
 420
 421         /* Make sure there isn't another open request for this pack */
 422         while (check_request) {
 423                 if (check_request->state == RUN_FETCH_PACKED &&
 424                     !strcmp(check_request->url, url)) {
 425                         free(url);
 426                         release_request(request);
 427                         return;
 428                 }
 429                 check_request = check_request->next;
 430         }
 431
 432         packfile = fopen(request->tmpfile, "a");
 433         if (!packfile) {
 434                 fprintf(stderr, "Unable to open local file %s for pack",
 435                         request->tmpfile);
 436                 remote->can_update_info_refs = 0;
 437                 free(url);
 438                 return;
 439         }
 440
 441         slot = get_active_slot();
 442         slot->callback_func = process_response;
 443         slot->callback_data = request;
 444         request->slot = slot;
 445         request->local_stream = packfile;
 446         request->userData = target;
 447
 448         request->url = url;
 449         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 450         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 451         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 452         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 453         slot->local = packfile;
 454
 455         /* If there is data present from a previous transfer attempt,
 456            resume where it left off */
 457         prev_posn = ftell(packfile);
 458         if (prev_posn>0) {
 459                 if (push_verbosely)
 460                         fprintf(stderr,
 461                                 "Resuming fetch of pack %s at byte %ld\n",
 462                                 sha1_to_hex(target->sha1), prev_posn);
 463                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 464                 range_header = curl_slist_append(range_header, range);
 465                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 466         }
 467
 468         /* Try to get the request started, abort the request on error */
 469         request->state = RUN_FETCH_PACKED;
 470         if (!start_active_slot(slot)) {
 471                 fprintf(stderr, "Unable to start GET request\n");
 472                 remote->can_update_info_refs = 0;
 473                 release_request(request);
 474         }
 475 }
 476
 477 static void start_put(struct transfer_request *request)
 478 {
 479         char *hex = sha1_to_hex(request->obj->sha1);
 480         struct active_request_slot *slot;
 481         char *posn;
 482         enum object_type type;
 483         char hdr[50];
 484         void *unpacked;
 485         unsigned long len;
 486         int hdrlen;
 487         ssize_t size;
 488         z_stream stream;
 489
 490         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 491         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 492
 493         /* Set it up */
 494         memset(&stream, 0, sizeof(stream));
 495         deflateInit(&stream, zlib_compression_level);
 496         size = deflateBound(&stream, len + hdrlen);
 497         strbuf_init(&request->buffer.buf, size);
 498         request->buffer.posn = 0;
 499
 500         /* Compress it */
 501         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 502         stream.avail_out = size;
 503
 504         /* First header.. */
 505         stream.next_in = (void *)hdr;
 506         stream.avail_in = hdrlen;
 507         while (deflate(&stream, 0) == Z_OK)
 508                 /* nothing */;
 509
 510         /* Then the data itself.. */
 511         stream.next_in = unpacked;
 512         stream.avail_in = len;
 513         while (deflate(&stream, Z_FINISH) == Z_OK)
 514                 /* nothing */;
 515         deflateEnd(&stream);
 516         free(unpacked);
 517
 518         request->buffer.buf.len = stream.total_out;
 519
 520         request->url = xmalloc(strlen(remote->url) +
 521                                strlen(request->lock->token) + 51);
 522         strcpy(request->url, remote->url);
 523         posn = request->url + strlen(remote->url);
 524         strcpy(posn, "objects/");
 525         posn += 8;
 526         memcpy(posn, hex, 2);
 527         posn += 2;
 528         *(posn++) = '/';
 529         strcpy(posn, hex + 2);
 530         request->dest = xmalloc(strlen(request->url) + 14);
 531         sprintf(request->dest, "Destination: %s", request->url);
 532         posn += 38;
 533         *(posn++) = '_';
 534         strcpy(posn, request->lock->token);
 535
 536         slot = get_active_slot();
 537         slot->callback_func = process_response;
 538         slot->callback_data = request;
 539         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 540         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 541         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 542         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 543         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 544         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 545         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 546         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 547         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 548
 549         if (start_active_slot(slot)) {
 550                 request->slot = slot;
 551                 request->state = RUN_PUT;
 552         } else {
 553                 request->state = ABORTED;
 554                 free(request->url);
 555                 request->url = NULL;
 556         }
 557 }
 558
 559 static void start_move(struct transfer_request *request)
 560 {
 561         struct active_request_slot *slot;
 562         struct curl_slist *dav_headers = NULL;
 563
 564         slot = get_active_slot();
 565         slot->callback_func = process_response;
 566         slot->callback_data = request;
 567         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 568         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 569         dav_headers = curl_slist_append(dav_headers, request->dest);
 570         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 571         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 572         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 573         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 574
 575         if (start_active_slot(slot)) {
 576                 request->slot = slot;
 577                 request->state = RUN_MOVE;
 578         } else {
 579                 request->state = ABORTED;
 580                 free(request->url);
 581                 request->url = NULL;
 582         }
 583 }
 584
 585 static int refresh_lock(struct remote_lock *lock)
 586 {
 587         struct active_request_slot *slot;
 588         struct slot_results results;
 589         char *if_header;
 590         char timeout_header[25];
 591         struct curl_slist *dav_headers = NULL;
 592         int rc = 0;
 593
 594         lock->refreshing = 1;
 595
 596         if_header = xmalloc(strlen(lock->token) + 25);
 597         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 598         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 599         dav_headers = curl_slist_append(dav_headers, if_header);
 600         dav_headers = curl_slist_append(dav_headers, timeout_header);
 601
 602         slot = get_active_slot();
 603         slot->results = &results;
 604         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 605         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 606         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 607         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 608         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 609
 610         if (start_active_slot(slot)) {
 611                 run_active_slot(slot);
 612                 if (results.curl_result != CURLE_OK) {
 613                         fprintf(stderr, "LOCK HTTP error %ld\n",
 614                                 results.http_code);
 615                 } else {
 616                         lock->start_time = time(NULL);
 617                         rc = 1;
 618                 }
 619         }
 620
 621         lock->refreshing = 0;
 622         curl_slist_free_all(dav_headers);
 623         free(if_header);
 624
 625         return rc;
 626 }
 627
 628 static void check_locks(void)
 629 {
 630         struct remote_lock *lock = remote->locks;
 631         time_t current_time = time(NULL);
 632         int time_remaining;
 633
 634         while (lock) {
 635                 time_remaining = lock->start_time + lock->timeout -
 636                         current_time;
 637                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 638                         if (!refresh_lock(lock)) {
 639                                 fprintf(stderr,
 640                                         "Unable to refresh lock for %s\n",
 641                                         lock->url);
 642                                 aborted = 1;
 643                                 return;
 644                         }
 645                 }
 646                 lock = lock->next;
 647         }
 648 }
 649
 650 static void release_request(struct transfer_request *request)
 651 {
 652         struct transfer_request *entry = request_queue_head;
 653
 654         if (request == request_queue_head) {
 655                 request_queue_head = request->next;
 656         } else {
 657                 while (entry->next != NULL && entry->next != request)
 658                         entry = entry->next;
 659                 if (entry->next == request)
 660                         entry->next = entry->next->next;
 661         }
 662
 663         if (request->local_fileno != -1)
 664                 close(request->local_fileno);
 665         if (request->local_stream)
 666                 fclose(request->local_stream);
 667         if (request->url != NULL)
 668                 free(request->url);
 669         free(request);
 670 }
 671
 672 static void finish_request(struct transfer_request *request)
 673 {
 674         struct stat st;
 675         struct packed_git *target;
 676         struct packed_git **lst;
 677
 678         request->curl_result = request->slot->curl_result;
 679         request->http_code = request->slot->http_code;
 680         request->slot = NULL;
 681
 682         /* Keep locks active */
 683         check_locks();
 684
 685         if (request->headers != NULL)
 686                 curl_slist_free_all(request->headers);
 687
 688         /* URL is reused for MOVE after PUT */
 689         if (request->state != RUN_PUT) {
 690                 free(request->url);
 691                 request->url = NULL;
 692         }
 693
 694         if (request->state == RUN_MKCOL) {
 695                 if (request->curl_result == CURLE_OK ||
 696                     request->http_code == 405) {
 697                         remote_dir_exists[request->obj->sha1[0]] = 1;
 698                         start_put(request);
 699                 } else {
 700                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 701                                 sha1_to_hex(request->obj->sha1),
 702                                 request->curl_result, request->http_code);
 703                         request->state = ABORTED;
 704                         aborted = 1;
 705                 }
 706         } else if (request->state == RUN_PUT) {
 707                 if (request->curl_result == CURLE_OK) {
 708                         start_move(request);
 709                 } else {
 710                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 711                                 sha1_to_hex(request->obj->sha1),
 712                                 request->curl_result, request->http_code);
 713                         request->state = ABORTED;
 714                         aborted = 1;
 715                 }
 716         } else if (request->state == RUN_MOVE) {
 717                 if (request->curl_result == CURLE_OK) {
 718                         if (push_verbosely)
 719                                 fprintf(stderr, "    sent %s\n",
 720                                         sha1_to_hex(request->obj->sha1));
 721                         request->obj->flags |= REMOTE;
 722                         release_request(request);
 723                 } else {
 724                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 725                                 sha1_to_hex(request->obj->sha1),
 726                                 request->curl_result, request->http_code);
 727                         request->state = ABORTED;
 728                         aborted = 1;
 729                 }
 730         } else if (request->state == RUN_FETCH_LOOSE) {
 731                 fchmod(request->local_fileno, 0444);
 732                 close(request->local_fileno); request->local_fileno = -1;
 733
 734                 if (request->curl_result != CURLE_OK &&
 735                     request->http_code != 416) {
 736                         if (stat(request->tmpfile, &st) == 0) {
 737                                 if (st.st_size == 0)
 738                                         unlink(request->tmpfile);
 739                         }
 740                 } else {
 741                         if (request->http_code == 416)
 742                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 743
 744                         inflateEnd(&request->stream);
 745                         SHA1_Final(request->real_sha1, &request->c);
 746                         if (request->zret != Z_STREAM_END) {
 747                                 unlink(request->tmpfile);
 748                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 749                                 unlink(request->tmpfile);
 750                         } else {
 751                                 request->rename =
 752                                         move_temp_to_file(
 753                                                 request->tmpfile,
 754                                                 request->filename);
 755                                 if (request->rename == 0) {
 756                                         request->obj->flags |= (LOCAL | REMOTE);
 757                                 }
 758                         }
 759                 }
 760
 761                 /* Try fetching packed if necessary */
 762                 if (request->obj->flags & LOCAL)
 763                         release_request(request);
 764                 else
 765                         start_fetch_packed(request);
 766
 767         } else if (request->state == RUN_FETCH_PACKED) {
 768                 if (request->curl_result != CURLE_OK) {
 769                         fprintf(stderr, "Unable to get pack file %s\n%s",
 770                                 request->url, curl_errorstr);
 771                         remote->can_update_info_refs = 0;
 772                 } else {
 773                         off_t pack_size = ftell(request->local_stream);
 774
 775                         fclose(request->local_stream);
 776                         request->local_stream = NULL;
 777                         if (!move_temp_to_file(request->tmpfile,
 778                                                request->filename)) {
 779                                 target = (struct packed_git *)request->userData;
 780                                 target->pack_size = pack_size;
 781                                 lst = &remote->packs;
 782                                 while (*lst != target)
 783                                         lst = &((*lst)->next);
 784                                 *lst = (*lst)->next;
 785
 786                                 if (!verify_pack(target, 0))
 787                                         install_packed_git(target);
 788                                 else
 789                                         remote->can_update_info_refs = 0;
 790                         }
 791                 }
 792                 release_request(request);
 793         }
 794 }
 795
 796 #ifdef USE_CURL_MULTI
 797 static int fill_active_slot(void *unused)
 798 {
 799         struct transfer_request *request = request_queue_head;
 800
 801         if (aborted)
 802                 return 0;
 803
 804         for (request = request_queue_head; request; request = request->next) {
 805                 if (request->state == NEED_FETCH) {
 806                         start_fetch_loose(request);
 807                         return 1;
 808                 } else if (pushing && request->state == NEED_PUSH) {
 809                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 810                                 start_put(request);
 811                         } else {
 812                                 start_mkcol(request);
 813                         }
 814                         return 1;
 815                 }
 816         }
 817         return 0;
 818 }
 819 #endif
 820
 821 static void get_remote_object_list(unsigned char parent);
 822
 823 static void add_fetch_request(struct object *obj)
 824 {
 825         struct transfer_request *request;
 826
 827         check_locks();
 828
 829         /*
 830          * Don't fetch the object if it's known to exist locally
 831          * or is already in the request queue
 832          */
 833         if (remote_dir_exists[obj->sha1[0]] == -1)
 834                 get_remote_object_list(obj->sha1[0]);
 835         if (obj->flags & (LOCAL | FETCHING))
 836                 return;
 837
 838         obj->flags |= FETCHING;
 839         request = xmalloc(sizeof(*request));
 840         request->obj = obj;
 841         request->url = NULL;
 842         request->lock = NULL;
 843         request->headers = NULL;
 844         request->local_fileno = -1;
 845         request->local_stream = NULL;
 846         request->state = NEED_FETCH;
 847         request->next = request_queue_head;
 848         request_queue_head = request;
 849
 850 #ifdef USE_CURL_MULTI
 851         fill_active_slots();
 852         step_active_slots();
 853 #endif
 854 }
 855
 856 static int add_send_request(struct object *obj, struct remote_lock *lock)
 857 {
 858         struct transfer_request *request = request_queue_head;
 859         struct packed_git *target;
 860
 861         /* Keep locks active */
 862         check_locks();
 863
 864         /*
 865          * Don't push the object if it's known to exist on the remote
 866          * or is already in the request queue
 867          */
 868         if (remote_dir_exists[obj->sha1[0]] == -1)
 869                 get_remote_object_list(obj->sha1[0]);
 870         if (obj->flags & (REMOTE | PUSHING))
 871                 return 0;
 872         target = find_sha1_pack(obj->sha1, remote->packs);
 873         if (target) {
 874                 obj->flags |= REMOTE;
 875                 return 0;
 876         }
 877
 878         obj->flags |= PUSHING;
 879         request = xmalloc(sizeof(*request));
 880         request->obj = obj;
 881         request->url = NULL;
 882         request->lock = lock;
 883         request->headers = NULL;
 884         request->local_fileno = -1;
 885         request->local_stream = NULL;
 886         request->state = NEED_PUSH;
 887         request->next = request_queue_head;
 888         request_queue_head = request;
 889
 890 #ifdef USE_CURL_MULTI
 891         fill_active_slots();
 892         step_active_slots();
 893 #endif
 894
 895         return 1;
 896 }
 897
 898 static int fetch_index(unsigned char *sha1)
 899 {
 900         char *hex = sha1_to_hex(sha1);
 901         char *filename;
 902         char *url;
 903         char tmpfile[PATH_MAX];
 904         long prev_posn = 0;
 905         char range[RANGE_HEADER_SIZE];
 906         struct curl_slist *range_header = NULL;
 907
 908         FILE *indexfile;
 909         struct active_request_slot *slot;
 910         struct slot_results results;
 911
 912         /* Don't use the index if the pack isn't there */
 913         url = xmalloc(strlen(remote->url) + 64);
 914         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 915         slot = get_active_slot();
 916         slot->results = &results;
 917         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 918         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 919         if (start_active_slot(slot)) {
 920                 run_active_slot(slot);
 921                 if (results.curl_result != CURLE_OK) {
 922                         free(url);
 923                         return error("Unable to verify pack %s is available",
 924                                      hex);
 925                 }
 926         } else {
 927                 free(url);
 928                 return error("Unable to start request");
 929         }
 930
 931         if (has_pack_index(sha1)) {
 932                 free(url);
 933                 return 0;
 934         }
 935
 936         if (push_verbosely)
 937                 fprintf(stderr, "Getting index for pack %s\n", hex);
 938
 939         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 940
 941         filename = sha1_pack_index_name(sha1);
 942         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 943         indexfile = fopen(tmpfile, "a");
 944         if (!indexfile) {
 945                 free(url);
 946                 return error("Unable to open local file %s for pack index",
 947                              tmpfile);
 948         }
 949
 950         slot = get_active_slot();
 951         slot->results = &results;
 952         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 953         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 954         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 955         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 956         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 957         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 958         slot->local = indexfile;
 959
 960         /* If there is data present from a previous transfer attempt,
 961            resume where it left off */
 962         prev_posn = ftell(indexfile);
 963         if (prev_posn>0) {
 964                 if (push_verbosely)
 965                         fprintf(stderr,
 966                                 "Resuming fetch of index for pack %s at byte %ld\n",
 967                                 hex, prev_posn);
 968                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 969                 range_header = curl_slist_append(range_header, range);
 970                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 971         }
 972
 973         if (start_active_slot(slot)) {
 974                 run_active_slot(slot);
 975                 if (results.curl_result != CURLE_OK) {
 976                         free(url);
 977                         fclose(indexfile);
 978                         return error("Unable to get pack index %s\n%s", url,
 979                                      curl_errorstr);
 980                 }
 981         } else {
 982                 free(url);
 983                 fclose(indexfile);
 984                 return error("Unable to start request");
 985         }
 986
 987         free(url);
 988         fclose(indexfile);
 989
 990         return move_temp_to_file(tmpfile, filename);
 991 }
 992
 993 static int setup_index(unsigned char *sha1)
 994 {
 995         struct packed_git *new_pack;
 996
 997         if (fetch_index(sha1))
 998                 return -1;
 999
1000         new_pack = parse_pack_index(sha1);
1001         new_pack->next = remote->packs;
1002         remote->packs = new_pack;
1003         return 0;
1004 }
1005
1006 static int fetch_indices(void)
1007 {
1008         unsigned char sha1[20];
1009         char *url;
1010         struct strbuf buffer = STRBUF_INIT;
1011         char *data;
1012         int i = 0;
1013
1014         struct active_request_slot *slot;
1015         struct slot_results results;
1016
1017         if (push_verbosely)
1018                 fprintf(stderr, "Getting pack list\n");
1019
1020         url = xmalloc(strlen(remote->url) + 20);
1021         sprintf(url, "%sobjects/info/packs", remote->url);
1022
1023         slot = get_active_slot();
1024         slot->results = &results;
1025         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1026         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1028         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1029         if (start_active_slot(slot)) {
1030                 run_active_slot(slot);
1031                 if (results.curl_result != CURLE_OK) {
1032                         strbuf_release(&buffer);
1033                         free(url);
1034                         if (results.http_code == 404)
1035                                 return 0;
1036                         else
1037                                 return error("%s", curl_errorstr);
1038                 }
1039         } else {
1040                 strbuf_release(&buffer);
1041                 free(url);
1042                 return error("Unable to start request");
1043         }
1044         free(url);
1045
1046         data = buffer.buf;
1047         while (i < buffer.len) {
1048                 switch (data[i]) {
1049                 case 'P':
1050                         i++;
1051                         if (i + 52 < buffer.len &&
1052                             !prefixcmp(data + i, " pack-") &&
1053                             !prefixcmp(data + i + 46, ".pack\n")) {
1054                                 get_sha1_hex(data + i + 6, sha1);
1055                                 setup_index(sha1);
1056                                 i += 51;
1057                                 break;
1058                         }
1059                 default:
1060                         while (data[i] != '\n')
1061                                 i++;
1062                 }
1063                 i++;
1064         }
1065
1066         strbuf_release(&buffer);
1067         return 0;
1068 }
1069
1070 static void one_remote_object(const char *hex)
1071 {
1072         unsigned char sha1[20];
1073         struct object *obj;
1074
1075         if (get_sha1_hex(hex, sha1) != 0)
1076                 return;
1077
1078         obj = lookup_object(sha1);
1079         if (!obj)
1080                 obj = parse_object(sha1);
1081
1082         /* Ignore remote objects that don't exist locally */
1083         if (!obj)
1084                 return;
1085
1086         obj->flags |= REMOTE;
1087         if (!object_list_contains(objects, obj))
1088                 object_list_insert(obj, &objects);
1089 }
1090
1091 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1092 {
1093         int *lock_flags = (int *)ctx->userData;
1094
1095         if (tag_closed) {
1096                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1097                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1098                             (*lock_flags & DAV_PROP_LOCKWR)) {
1099                                 *lock_flags |= DAV_LOCK_OK;
1100                         }
1101                         *lock_flags &= DAV_LOCK_OK;
1102                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1103                         *lock_flags |= DAV_PROP_LOCKWR;
1104                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1105                         *lock_flags |= DAV_PROP_LOCKEX;
1106                 }
1107         }
1108 }
1109
1110 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1111 {
1112         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1113
1114         if (tag_closed && ctx->cdata) {
1115                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1116                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1117                         strcpy(lock->owner, ctx->cdata);
1118                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1119                         if (!prefixcmp(ctx->cdata, "Second-"))
1120                                 lock->timeout =
1121                                         strtol(ctx->cdata + 7, NULL, 10);
1122                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1123                         if (!prefixcmp(ctx->cdata, "opaquelocktoken:")) {
1124                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1125                                 strcpy(lock->token, ctx->cdata + 16);
1126                         }
1127                 }
1128         }
1129 }
1130
1131 static void one_remote_ref(char *refname);
1132
1133 static void
1134 xml_start_tag(void *userData, const char *name, const char **atts)
1135 {
1136         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1137         const char *c = strchr(name, ':');
1138         int new_len;
1139
1140         if (c == NULL)
1141                 c = name;
1142         else
1143                 c++;
1144
1145         new_len = strlen(ctx->name) + strlen(c) + 2;
1146
1147         if (new_len > ctx->len) {
1148                 ctx->name = xrealloc(ctx->name, new_len);
1149                 ctx->len = new_len;
1150         }
1151         strcat(ctx->name, ".");
1152         strcat(ctx->name, c);
1153
1154         free(ctx->cdata);
1155         ctx->cdata = NULL;
1156
1157         ctx->userFunc(ctx, 0);
1158 }
1159
1160 static void
1161 xml_end_tag(void *userData, const char *name)
1162 {
1163         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1164         const char *c = strchr(name, ':');
1165         char *ep;
1166
1167         ctx->userFunc(ctx, 1);
1168
1169         if (c == NULL)
1170                 c = name;
1171         else
1172                 c++;
1173
1174         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1175         *ep = 0;
1176 }
1177
1178 static void
1179 xml_cdata(void *userData, const XML_Char *s, int len)
1180 {
1181         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1182         free(ctx->cdata);
1183         ctx->cdata = xmemdupz(s, len);
1184 }
1185
1186 static struct remote_lock *lock_remote(const char *path, long timeout)
1187 {
1188         struct active_request_slot *slot;
1189         struct slot_results results;
1190         struct buffer out_buffer = { STRBUF_INIT, 0 };
1191         struct strbuf in_buffer = STRBUF_INIT;
1192         char *url;
1193         char *ep;
1194         char timeout_header[25];
1195         struct remote_lock *lock = NULL;
1196         struct curl_slist *dav_headers = NULL;
1197         struct xml_ctx ctx;
1198
1199         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1200         sprintf(url, "%s%s", remote->url, path);
1201
1202         /* Make sure leading directories exist for the remote ref */
1203         ep = strchr(url + strlen(remote->url) + 1, '/');
1204         while (ep) {
1205                 *ep = 0;
1206                 slot = get_active_slot();
1207                 slot->results = &results;
1208                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1209                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1210                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1211                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1212                 if (start_active_slot(slot)) {
1213                         run_active_slot(slot);
1214                         if (results.curl_result != CURLE_OK &&
1215                             results.http_code != 405) {
1216                                 fprintf(stderr,
1217                                         "Unable to create branch path %s\n",
1218                                         url);
1219                                 free(url);
1220                                 return NULL;
1221                         }
1222                 } else {
1223                         fprintf(stderr, "Unable to start MKCOL request\n");
1224                         free(url);
1225                         return NULL;
1226                 }
1227                 *ep = '/';
1228                 ep = strchr(ep + 1, '/');
1229         }
1230
1231         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1232
1233         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1234         dav_headers = curl_slist_append(dav_headers, timeout_header);
1235         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1236
1237         slot = get_active_slot();
1238         slot->results = &results;
1239         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1240         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1241         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1242         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1243         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1244         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1245         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1246         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1247         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1248
1249         lock = xcalloc(1, sizeof(*lock));
1250         lock->timeout = -1;
1251
1252         if (start_active_slot(slot)) {
1253                 run_active_slot(slot);
1254                 if (results.curl_result == CURLE_OK) {
1255                         XML_Parser parser = XML_ParserCreate(NULL);
1256                         enum XML_Status result;
1257                         ctx.name = xcalloc(10, 1);
1258                         ctx.len = 0;
1259                         ctx.cdata = NULL;
1260                         ctx.userFunc = handle_new_lock_ctx;
1261                         ctx.userData = lock;
1262                         XML_SetUserData(parser, &ctx);
1263                         XML_SetElementHandler(parser, xml_start_tag,
1264                                               xml_end_tag);
1265                         XML_SetCharacterDataHandler(parser, xml_cdata);
1266                         result = XML_Parse(parser, in_buffer.buf,
1267                                            in_buffer.len, 1);
1268                         free(ctx.name);
1269                         if (result != XML_STATUS_OK) {
1270                                 fprintf(stderr, "XML error: %s\n",
1271                                         XML_ErrorString(
1272                                                 XML_GetErrorCode(parser)));
1273                                 lock->timeout = -1;
1274                         }
1275                         XML_ParserFree(parser);
1276                 }
1277         } else {
1278                 fprintf(stderr, "Unable to start LOCK request\n");
1279         }
1280
1281         curl_slist_free_all(dav_headers);
1282         strbuf_release(&out_buffer.buf);
1283         strbuf_release(&in_buffer);
1284
1285         if (lock->token == NULL || lock->timeout <= 0) {
1286                 if (lock->token != NULL)
1287                         free(lock->token);
1288                 if (lock->owner != NULL)
1289                         free(lock->owner);
1290                 free(url);
1291                 free(lock);
1292                 lock = NULL;
1293         } else {
1294                 lock->url = url;
1295                 lock->start_time = time(NULL);
1296                 lock->next = remote->locks;
1297                 remote->locks = lock;
1298         }
1299
1300         return lock;
1301 }
1302
1303 static int unlock_remote(struct remote_lock *lock)
1304 {
1305         struct active_request_slot *slot;
1306         struct slot_results results;
1307         struct remote_lock *prev = remote->locks;
1308         char *lock_token_header;
1309         struct curl_slist *dav_headers = NULL;
1310         int rc = 0;
1311
1312         lock_token_header = xmalloc(strlen(lock->token) + 31);
1313         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1314                 lock->token);
1315         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1316
1317         slot = get_active_slot();
1318         slot->results = &results;
1319         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1320         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1321         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1322         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1323
1324         if (start_active_slot(slot)) {
1325                 run_active_slot(slot);
1326                 if (results.curl_result == CURLE_OK)
1327                         rc = 1;
1328                 else
1329                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1330                                 results.http_code);
1331         } else {
1332                 fprintf(stderr, "Unable to start UNLOCK request\n");
1333         }
1334
1335         curl_slist_free_all(dav_headers);
1336         free(lock_token_header);
1337
1338         if (remote->locks == lock) {
1339                 remote->locks = lock->next;
1340         } else {
1341                 while (prev && prev->next != lock)
1342                         prev = prev->next;
1343                 if (prev)
1344                         prev->next = prev->next->next;
1345         }
1346
1347         if (lock->owner != NULL)
1348                 free(lock->owner);
1349         free(lock->url);
1350         free(lock->token);
1351         free(lock);
1352
1353         return rc;
1354 }
1355
1356 static void remote_ls(const char *path, int flags,
1357                       void (*userFunc)(struct remote_ls_ctx *ls),
1358                       void *userData);
1359
1360 static void process_ls_object(struct remote_ls_ctx *ls)
1361 {
1362         unsigned int *parent = (unsigned int *)ls->userData;
1363         char *path = ls->dentry_name;
1364         char *obj_hex;
1365
1366         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1367                 remote_dir_exists[*parent] = 1;
1368                 return;
1369         }
1370
1371         if (strlen(path) != 49)
1372                 return;
1373         path += 8;
1374         obj_hex = xmalloc(strlen(path));
1375         /* NB: path is not null-terminated, can not use strlcpy here */
1376         memcpy(obj_hex, path, 2);
1377         strcpy(obj_hex + 2, path + 3);
1378         one_remote_object(obj_hex);
1379         free(obj_hex);
1380 }
1381
1382 static void process_ls_ref(struct remote_ls_ctx *ls)
1383 {
1384         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1385                 fprintf(stderr, "  %s\n", ls->dentry_name);
1386                 return;
1387         }
1388
1389         if (!(ls->dentry_flags & IS_DIR))
1390                 one_remote_ref(ls->dentry_name);
1391 }
1392
1393 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1394 {
1395         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1396
1397         if (tag_closed) {
1398                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1399                         if (ls->dentry_flags & IS_DIR) {
1400                                 if (ls->flags & PROCESS_DIRS) {
1401                                         ls->userFunc(ls);
1402                                 }
1403                                 if (strcmp(ls->dentry_name, ls->path) &&
1404                                     ls->flags & RECURSIVE) {
1405                                         remote_ls(ls->dentry_name,
1406                                                   ls->flags,
1407                                                   ls->userFunc,
1408                                                   ls->userData);
1409                                 }
1410                         } else if (ls->flags & PROCESS_FILES) {
1411                                 ls->userFunc(ls);
1412                         }
1413                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1414                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1415                                                   remote->path_len + 1);
1416                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1417                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1418                         ls->dentry_flags |= IS_DIR;
1419                 }
1420         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1421                 free(ls->dentry_name);
1422                 ls->dentry_name = NULL;
1423                 ls->dentry_flags = 0;
1424         }
1425 }
1426
1427 static void remote_ls(const char *path, int flags,
1428                       void (*userFunc)(struct remote_ls_ctx *ls),
1429                       void *userData)
1430 {
1431         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1432         struct active_request_slot *slot;
1433         struct slot_results results;
1434         struct strbuf in_buffer = STRBUF_INIT;
1435         struct buffer out_buffer = { STRBUF_INIT, 0 };
1436         struct curl_slist *dav_headers = NULL;
1437         struct xml_ctx ctx;
1438         struct remote_ls_ctx ls;
1439
1440         ls.flags = flags;
1441         ls.path = xstrdup(path);
1442         ls.dentry_name = NULL;
1443         ls.dentry_flags = 0;
1444         ls.userData = userData;
1445         ls.userFunc = userFunc;
1446
1447         sprintf(url, "%s%s", remote->url, path);
1448
1449         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1450
1451         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1452         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1453
1454         slot = get_active_slot();
1455         slot->results = &results;
1456         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1457         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1458         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1459         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1460         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1461         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1462         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1463         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1464         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1465
1466         if (start_active_slot(slot)) {
1467                 run_active_slot(slot);
1468                 if (results.curl_result == CURLE_OK) {
1469                         XML_Parser parser = XML_ParserCreate(NULL);
1470                         enum XML_Status result;
1471                         ctx.name = xcalloc(10, 1);
1472                         ctx.len = 0;
1473                         ctx.cdata = NULL;
1474                         ctx.userFunc = handle_remote_ls_ctx;
1475                         ctx.userData = &ls;
1476                         XML_SetUserData(parser, &ctx);
1477                         XML_SetElementHandler(parser, xml_start_tag,
1478                                               xml_end_tag);
1479                         XML_SetCharacterDataHandler(parser, xml_cdata);
1480                         result = XML_Parse(parser, in_buffer.buf,
1481                                            in_buffer.len, 1);
1482                         free(ctx.name);
1483
1484                         if (result != XML_STATUS_OK) {
1485                                 fprintf(stderr, "XML error: %s\n",
1486                                         XML_ErrorString(
1487                                                 XML_GetErrorCode(parser)));
1488                         }
1489                         XML_ParserFree(parser);
1490                 }
1491         } else {
1492                 fprintf(stderr, "Unable to start PROPFIND request\n");
1493         }
1494
1495         free(ls.path);
1496         free(url);
1497         strbuf_release(&out_buffer.buf);
1498         strbuf_release(&in_buffer);
1499         curl_slist_free_all(dav_headers);
1500 }
1501
1502 static void get_remote_object_list(unsigned char parent)
1503 {
1504         char path[] = "objects/XX/";
1505         static const char hex[] = "0123456789abcdef";
1506         unsigned int val = parent;
1507
1508         path[8] = hex[val >> 4];
1509         path[9] = hex[val & 0xf];
1510         remote_dir_exists[val] = 0;
1511         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1512                   process_ls_object, &val);
1513 }
1514
1515 static int locking_available(void)
1516 {
1517         struct active_request_slot *slot;
1518         struct slot_results results;
1519         struct strbuf in_buffer = STRBUF_INIT;
1520         struct buffer out_buffer = { STRBUF_INIT, 0 };
1521         struct curl_slist *dav_headers = NULL;
1522         struct xml_ctx ctx;
1523         int lock_flags = 0;
1524
1525         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1526
1527         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1528         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1529
1530         slot = get_active_slot();
1531         slot->results = &results;
1532         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1533         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1534         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1535         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1536         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1537         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1538         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1539         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1540         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1541
1542         if (start_active_slot(slot)) {
1543                 run_active_slot(slot);
1544                 if (results.curl_result == CURLE_OK) {
1545                         XML_Parser parser = XML_ParserCreate(NULL);
1546                         enum XML_Status result;
1547                         ctx.name = xcalloc(10, 1);
1548                         ctx.len = 0;
1549                         ctx.cdata = NULL;
1550                         ctx.userFunc = handle_lockprop_ctx;
1551                         ctx.userData = &lock_flags;
1552                         XML_SetUserData(parser, &ctx);
1553                         XML_SetElementHandler(parser, xml_start_tag,
1554                                               xml_end_tag);
1555                         result = XML_Parse(parser, in_buffer.buf,
1556                                            in_buffer.len, 1);
1557                         free(ctx.name);
1558
1559                         if (result != XML_STATUS_OK) {
1560                                 fprintf(stderr, "XML error: %s\n",
1561                                         XML_ErrorString(
1562                                                 XML_GetErrorCode(parser)));
1563                                 lock_flags = 0;
1564                         }
1565                         XML_ParserFree(parser);
1566                 }
1567         } else {
1568                 fprintf(stderr, "Unable to start PROPFIND request\n");
1569         }
1570
1571         strbuf_release(&out_buffer.buf);
1572         strbuf_release(&in_buffer);
1573         curl_slist_free_all(dav_headers);
1574
1575         return lock_flags;
1576 }
1577
1578 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1579 {
1580         struct object_list *entry = xmalloc(sizeof(struct object_list));
1581         entry->item = obj;
1582         entry->next = *p;
1583         *p = entry;
1584         return &entry->next;
1585 }
1586
1587 static struct object_list **process_blob(struct blob *blob,
1588                                          struct object_list **p,
1589                                          struct name_path *path,
1590                                          const char *name)
1591 {
1592         struct object *obj = &blob->object;
1593
1594         obj->flags |= LOCAL;
1595
1596         if (obj->flags & (UNINTERESTING | SEEN))
1597                 return p;
1598
1599         obj->flags |= SEEN;
1600         return add_one_object(obj, p);
1601 }
1602
1603 static struct object_list **process_tree(struct tree *tree,
1604                                          struct object_list **p,
1605                                          struct name_path *path,
1606                                          const char *name)
1607 {
1608         struct object *obj = &tree->object;
1609         struct tree_desc desc;
1610         struct name_entry entry;
1611         struct name_path me;
1612
1613         obj->flags |= LOCAL;
1614
1615         if (obj->flags & (UNINTERESTING | SEEN))
1616                 return p;
1617         if (parse_tree(tree) < 0)
1618                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1619
1620         obj->flags |= SEEN;
1621         name = xstrdup(name);
1622         p = add_one_object(obj, p);
1623         me.up = path;
1624         me.elem = name;
1625         me.elem_len = strlen(name);
1626
1627         init_tree_desc(&desc, tree->buffer, tree->size);
1628
1629         while (tree_entry(&desc, &entry)) {
1630                 if (S_ISDIR(entry.mode))
1631                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1632                 else
1633                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1634         }
1635         free(tree->buffer);
1636         tree->buffer = NULL;
1637         return p;
1638 }
1639
1640 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1641 {
1642         int i;
1643         struct commit *commit;
1644         struct object_list **p = &objects;
1645         int count = 0;
1646
1647         while ((commit = get_revision(revs)) != NULL) {
1648                 p = process_tree(commit->tree, p, NULL, "");
1649                 commit->object.flags |= LOCAL;
1650                 if (!(commit->object.flags & UNINTERESTING))
1651                         count += add_send_request(&commit->object, lock);
1652         }
1653
1654         for (i = 0; i < revs->pending.nr; i++) {
1655                 struct object_array_entry *entry = revs->pending.objects + i;
1656                 struct object *obj = entry->item;
1657                 const char *name = entry->name;
1658
1659                 if (obj->flags & (UNINTERESTING | SEEN))
1660                         continue;
1661                 if (obj->type == OBJ_TAG) {
1662                         obj->flags |= SEEN;
1663                         p = add_one_object(obj, p);
1664                         continue;
1665                 }
1666                 if (obj->type == OBJ_TREE) {
1667                         p = process_tree((struct tree *)obj, p, NULL, name);
1668                         continue;
1669                 }
1670                 if (obj->type == OBJ_BLOB) {
1671                         p = process_blob((struct blob *)obj, p, NULL, name);
1672                         continue;
1673                 }
1674                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1675         }
1676
1677         while (objects) {
1678                 if (!(objects->item->flags & UNINTERESTING))
1679                         count += add_send_request(objects->item, lock);
1680                 objects = objects->next;
1681         }
1682
1683         return count;
1684 }
1685
1686 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1687 {
1688         struct active_request_slot *slot;
1689         struct slot_results results;
1690         char *if_header;
1691         struct buffer out_buffer = { STRBUF_INIT, 0 };
1692         struct curl_slist *dav_headers = NULL;
1693
1694         if_header = xmalloc(strlen(lock->token) + 25);
1695         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1696         dav_headers = curl_slist_append(dav_headers, if_header);
1697
1698         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1699
1700         slot = get_active_slot();
1701         slot->results = &results;
1702         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1703         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1704         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1705         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1706         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1707         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1708         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1709         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1710         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1711
1712         if (start_active_slot(slot)) {
1713                 run_active_slot(slot);
1714                 strbuf_release(&out_buffer.buf);
1715                 free(if_header);
1716                 if (results.curl_result != CURLE_OK) {
1717                         fprintf(stderr,
1718                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1719                                 results.curl_result, results.http_code);
1720                         /* We should attempt recovery? */
1721                         return 0;
1722                 }
1723         } else {
1724                 strbuf_release(&out_buffer.buf);
1725                 free(if_header);
1726                 fprintf(stderr, "Unable to start PUT request\n");
1727                 return 0;
1728         }
1729
1730         return 1;
1731 }
1732
1733 static struct ref *local_refs, **local_tail;
1734 static struct ref *remote_refs, **remote_tail;
1735
1736 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1737 {
1738         struct ref *ref;
1739         int len = strlen(refname) + 1;
1740         ref = xcalloc(1, sizeof(*ref) + len);
1741         hashcpy(ref->new_sha1, sha1);
1742         memcpy(ref->name, refname, len);
1743         *local_tail = ref;
1744         local_tail = &ref->next;
1745         return 0;
1746 }
1747
1748 static void one_remote_ref(char *refname)
1749 {
1750         struct ref *ref;
1751         unsigned char remote_sha1[20];
1752         struct object *obj;
1753         int len = strlen(refname) + 1;
1754
1755         if (http_fetch_ref(remote->url, refname + 5 /* "refs/" */,
1756                            remote_sha1) != 0) {
1757                 fprintf(stderr,
1758                         "Unable to fetch ref %s from %s\n",
1759                         refname, remote->url);
1760                 return;
1761         }
1762
1763         /*
1764          * Fetch a copy of the object if it doesn't exist locally - it
1765          * may be required for updating server info later.
1766          */
1767         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1768                 obj = lookup_unknown_object(remote_sha1);
1769                 if (obj) {
1770                         fprintf(stderr, "  fetch %s for %s\n",
1771                                 sha1_to_hex(remote_sha1), refname);
1772                         add_fetch_request(obj);
1773                 }
1774         }
1775
1776         ref = xcalloc(1, sizeof(*ref) + len);
1777         hashcpy(ref->old_sha1, remote_sha1);
1778         memcpy(ref->name, refname, len);
1779         *remote_tail = ref;
1780         remote_tail = &ref->next;
1781 }
1782
1783 static void get_local_heads(void)
1784 {
1785         local_tail = &local_refs;
1786         for_each_ref(one_local_ref, NULL);
1787 }
1788
1789 static void get_dav_remote_heads(void)
1790 {
1791         remote_tail = &remote_refs;
1792         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1793 }
1794
1795 static int is_zero_sha1(const unsigned char *sha1)
1796 {
1797         int i;
1798
1799         for (i = 0; i < 20; i++) {
1800                 if (*sha1++)
1801                         return 0;
1802         }
1803         return 1;
1804 }
1805
1806 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1807 {
1808         while (list) {
1809                 struct commit_list *temp = list;
1810                 temp->item->object.flags &= ~mark;
1811                 list = temp->next;
1812                 free(temp);
1813         }
1814 }
1815
1816 static int ref_newer(const unsigned char *new_sha1,
1817                      const unsigned char *old_sha1)
1818 {
1819         struct object *o;
1820         struct commit *old, *new;
1821         struct commit_list *list, *used;
1822         int found = 0;
1823
1824         /* Both new and old must be commit-ish and new is descendant of
1825          * old.  Otherwise we require --force.
1826          */
1827         o = deref_tag(parse_object(old_sha1), NULL, 0);
1828         if (!o || o->type != OBJ_COMMIT)
1829                 return 0;
1830         old = (struct commit *) o;
1831
1832         o = deref_tag(parse_object(new_sha1), NULL, 0);
1833         if (!o || o->type != OBJ_COMMIT)
1834                 return 0;
1835         new = (struct commit *) o;
1836
1837         if (parse_commit(new) < 0)
1838                 return 0;
1839
1840         used = list = NULL;
1841         commit_list_insert(new, &list);
1842         while (list) {
1843                 new = pop_most_recent_commit(&list, TMP_MARK);
1844                 commit_list_insert(new, &used);
1845                 if (new == old) {
1846                         found = 1;
1847                         break;
1848                 }
1849         }
1850         unmark_and_free(list, TMP_MARK);
1851         unmark_and_free(used, TMP_MARK);
1852         return found;
1853 }
1854
1855 static void mark_edge_parents_uninteresting(struct commit *commit)
1856 {
1857         struct commit_list *parents;
1858
1859         for (parents = commit->parents; parents; parents = parents->next) {
1860                 struct commit *parent = parents->item;
1861                 if (!(parent->object.flags & UNINTERESTING))
1862                         continue;
1863                 mark_tree_uninteresting(parent->tree);
1864         }
1865 }
1866
1867 static void mark_edges_uninteresting(struct commit_list *list)
1868 {
1869         for ( ; list; list = list->next) {
1870                 struct commit *commit = list->item;
1871
1872                 if (commit->object.flags & UNINTERESTING) {
1873                         mark_tree_uninteresting(commit->tree);
1874                         continue;
1875                 }
1876                 mark_edge_parents_uninteresting(commit);
1877         }
1878 }
1879
1880 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1881 {
1882         struct strbuf *buf = (struct strbuf *)ls->userData;
1883         unsigned char remote_sha1[20];
1884         struct object *o;
1885         int len;
1886         char *ref_info;
1887
1888         if (http_fetch_ref(remote->url, ls->dentry_name + 5 /* "refs/" */,
1889                            remote_sha1) != 0) {
1890                 fprintf(stderr,
1891                         "Unable to fetch ref %s from %s\n",
1892                         ls->dentry_name, remote->url);
1893                 aborted = 1;
1894                 return;
1895         }
1896
1897         o = parse_object(remote_sha1);
1898         if (!o) {
1899                 fprintf(stderr,
1900                         "Unable to parse object %s for remote ref %s\n",
1901                         sha1_to_hex(remote_sha1), ls->dentry_name);
1902                 aborted = 1;
1903                 return;
1904         }
1905
1906         len = strlen(ls->dentry_name) + 42;
1907         ref_info = xcalloc(len + 1, 1);
1908         sprintf(ref_info, "%s   %s\n",
1909                 sha1_to_hex(remote_sha1), ls->dentry_name);
1910         fwrite_buffer(ref_info, 1, len, buf);
1911         free(ref_info);
1912
1913         if (o->type == OBJ_TAG) {
1914                 o = deref_tag(o, ls->dentry_name, 0);
1915                 if (o) {
1916                         len = strlen(ls->dentry_name) + 45;
1917                         ref_info = xcalloc(len + 1, 1);
1918                         sprintf(ref_info, "%s   %s^{}\n",
1919                                 sha1_to_hex(o->sha1), ls->dentry_name);
1920                         fwrite_buffer(ref_info, 1, len, buf);
1921                         free(ref_info);
1922                 }
1923         }
1924 }
1925
1926 static void update_remote_info_refs(struct remote_lock *lock)
1927 {
1928         struct buffer buffer = { STRBUF_INIT, 0 };
1929         struct active_request_slot *slot;
1930         struct slot_results results;
1931         char *if_header;
1932         struct curl_slist *dav_headers = NULL;
1933
1934         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1935                   add_remote_info_ref, &buffer.buf);
1936         if (!aborted) {
1937                 if_header = xmalloc(strlen(lock->token) + 25);
1938                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1939                 dav_headers = curl_slist_append(dav_headers, if_header);
1940
1941                 slot = get_active_slot();
1942                 slot->results = &results;
1943                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1944                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1945                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1946                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1947                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1948                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1949                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1950                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1951                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1952
1953                 if (start_active_slot(slot)) {
1954                         run_active_slot(slot);
1955                         if (results.curl_result != CURLE_OK) {
1956                                 fprintf(stderr,
1957                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1958                                         results.curl_result, results.http_code);
1959                         }
1960                 }
1961                 free(if_header);
1962         }
1963         strbuf_release(&buffer.buf);
1964 }
1965
1966 static int remote_exists(const char *path)
1967 {
1968         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1969         struct active_request_slot *slot;
1970         struct slot_results results;
1971         int ret = -1;
1972
1973         sprintf(url, "%s%s", remote->url, path);
1974
1975         slot = get_active_slot();
1976         slot->results = &results;
1977         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1978         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1979
1980         if (start_active_slot(slot)) {
1981                 run_active_slot(slot);
1982                 if (results.http_code == 404)
1983                         ret = 0;
1984                 else if (results.curl_result == CURLE_OK)
1985                         ret = 1;
1986                 else
1987                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
1988         } else {
1989                 fprintf(stderr, "Unable to start HEAD request\n");
1990         }
1991
1992         free(url);
1993         return ret;
1994 }
1995
1996 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1997 {
1998         char *url;
1999         struct strbuf buffer = STRBUF_INIT;
2000         struct active_request_slot *slot;
2001         struct slot_results results;
2002
2003         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2004         sprintf(url, "%s%s", remote->url, path);
2005
2006         slot = get_active_slot();
2007         slot->results = &results;
2008         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2009         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2010         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2011         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2012         if (start_active_slot(slot)) {
2013                 run_active_slot(slot);
2014                 if (results.curl_result != CURLE_OK) {
2015                         die("Couldn't get %s for remote symref\n%s",
2016                             url, curl_errorstr);
2017                 }
2018         } else {
2019                 die("Unable to start remote symref request");
2020         }
2021         free(url);
2022
2023         if (*symref != NULL)
2024                 free(*symref);
2025         *symref = NULL;
2026         hashclr(sha1);
2027
2028         if (buffer.len == 0)
2029                 return;
2030
2031         /* If it's a symref, set the refname; otherwise try for a sha1 */
2032         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2033                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2034         } else {
2035                 get_sha1_hex(buffer.buf, sha1);
2036         }
2037
2038         strbuf_release(&buffer);
2039 }
2040
2041 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2042 {
2043         struct commit *head = lookup_commit(head_sha1);
2044         struct commit *branch = lookup_commit(branch_sha1);
2045         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2046
2047         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2048 }
2049
2050 static int delete_remote_branch(char *pattern, int force)
2051 {
2052         struct ref *refs = remote_refs;
2053         struct ref *remote_ref = NULL;
2054         unsigned char head_sha1[20];
2055         char *symref = NULL;
2056         int match;
2057         int patlen = strlen(pattern);
2058         int i;
2059         struct active_request_slot *slot;
2060         struct slot_results results;
2061         char *url;
2062
2063         /* Find the remote branch(es) matching the specified branch name */
2064         for (match = 0; refs; refs = refs->next) {
2065                 char *name = refs->name;
2066                 int namelen = strlen(name);
2067                 if (namelen < patlen ||
2068                     memcmp(name + namelen - patlen, pattern, patlen))
2069                         continue;
2070                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2071                         continue;
2072                 match++;
2073                 remote_ref = refs;
2074         }
2075         if (match == 0)
2076                 return error("No remote branch matches %s", pattern);
2077         if (match != 1)
2078                 return error("More than one remote branch matches %s",
2079                              pattern);
2080
2081         /*
2082          * Remote HEAD must be a symref (not exactly foolproof; a remote
2083          * symlink to a symref will look like a symref)
2084          */
2085         fetch_symref("HEAD", &symref, head_sha1);
2086         if (!symref)
2087                 return error("Remote HEAD is not a symref");
2088
2089         /* Remote branch must not be the remote HEAD */
2090         for (i=0; symref && i<MAXDEPTH; i++) {
2091                 if (!strcmp(remote_ref->name, symref))
2092                         return error("Remote branch %s is the current HEAD",
2093                                      remote_ref->name);
2094                 fetch_symref(symref, &symref, head_sha1);
2095         }
2096
2097         /* Run extra sanity checks if delete is not forced */
2098         if (!force) {
2099                 /* Remote HEAD must resolve to a known object */
2100                 if (symref)
2101                         return error("Remote HEAD symrefs too deep");
2102                 if (is_zero_sha1(head_sha1))
2103                         return error("Unable to resolve remote HEAD");
2104                 if (!has_sha1_file(head_sha1))
2105                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2106
2107                 /* Remote branch must resolve to a known object */
2108                 if (is_zero_sha1(remote_ref->old_sha1))
2109                         return error("Unable to resolve remote branch %s",
2110                                      remote_ref->name);
2111                 if (!has_sha1_file(remote_ref->old_sha1))
2112                         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));
2113
2114                 /* Remote branch must be an ancestor of remote HEAD */
2115                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2116                         return error("The branch '%s' is not an ancestor "
2117                                      "of your current HEAD.\n"
2118                                      "If you are sure you want to delete it,"
2119                                      " run:\n\t'git http-push -D %s %s'",
2120                                      remote_ref->name, remote->url, pattern);
2121                 }
2122         }
2123
2124         /* Send delete request */
2125         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2126         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2127         sprintf(url, "%s%s", remote->url, remote_ref->name);
2128         slot = get_active_slot();
2129         slot->results = &results;
2130         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2131         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2132         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2133         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2134         if (start_active_slot(slot)) {
2135                 run_active_slot(slot);
2136                 free(url);
2137                 if (results.curl_result != CURLE_OK)
2138                         return error("DELETE request failed (%d/%ld)\n",
2139                                      results.curl_result, results.http_code);
2140         } else {
2141                 free(url);
2142                 return error("Unable to start DELETE request");
2143         }
2144
2145         return 0;
2146 }
2147
2148 int main(int argc, char **argv)
2149 {
2150         struct transfer_request *request;
2151         struct transfer_request *next_request;
2152         int nr_refspec = 0;
2153         char **refspec = NULL;
2154         struct remote_lock *ref_lock = NULL;
2155         struct remote_lock *info_ref_lock = NULL;
2156         struct rev_info revs;
2157         int delete_branch = 0;
2158         int force_delete = 0;
2159         int objects_to_send;
2160         int rc = 0;
2161         int i;
2162         int new_refs;
2163         struct ref *ref;
2164
2165         setup_git_directory();
2166
2167         remote = xcalloc(sizeof(*remote), 1);
2168
2169         argv++;
2170         for (i = 1; i < argc; i++, argv++) {
2171                 char *arg = *argv;
2172
2173                 if (*arg == '-') {
2174                         if (!strcmp(arg, "--all")) {
2175                                 push_all = MATCH_REFS_ALL;
2176                                 continue;
2177                         }
2178                         if (!strcmp(arg, "--force")) {
2179                                 force_all = 1;
2180                                 continue;
2181                         }
2182                         if (!strcmp(arg, "--dry-run")) {
2183                                 dry_run = 1;
2184                                 continue;
2185                         }
2186                         if (!strcmp(arg, "--verbose")) {
2187                                 push_verbosely = 1;
2188                                 continue;
2189                         }
2190                         if (!strcmp(arg, "-d")) {
2191                                 delete_branch = 1;
2192                                 continue;
2193                         }
2194                         if (!strcmp(arg, "-D")) {
2195                                 delete_branch = 1;
2196                                 force_delete = 1;
2197                                 continue;
2198                         }
2199                 }
2200                 if (!remote->url) {
2201                         char *path = strstr(arg, "//");
2202                         remote->url = arg;
2203                         if (path) {
2204                                 path = strchr(path+2, '/');
2205                                 if (path)
2206                                         remote->path_len = strlen(path);
2207                         }
2208                         continue;
2209                 }
2210                 refspec = argv;
2211                 nr_refspec = argc - i;
2212                 break;
2213         }
2214
2215         if (!remote->url)
2216                 usage(http_push_usage);
2217
2218         if (delete_branch && nr_refspec != 1)
2219                 die("You must specify only one branch name when deleting a remote branch");
2220
2221         memset(remote_dir_exists, -1, 256);
2222
2223         http_init();
2224
2225         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2226
2227         /* Verify DAV compliance/lock support */
2228         if (!locking_available()) {
2229                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2230                 rc = 1;
2231                 goto cleanup;
2232         }
2233
2234         /* Check whether the remote has server info files */
2235         remote->can_update_info_refs = 0;
2236         remote->has_info_refs = remote_exists("info/refs");
2237         remote->has_info_packs = remote_exists("objects/info/packs");
2238         if (remote->has_info_refs) {
2239                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2240                 if (info_ref_lock)
2241                         remote->can_update_info_refs = 1;
2242         }
2243         if (remote->has_info_packs)
2244                 fetch_indices();
2245
2246         /* Get a list of all local and remote heads to validate refspecs */
2247         get_local_heads();
2248         fprintf(stderr, "Fetching remote heads...\n");
2249         get_dav_remote_heads();
2250
2251         /* Remove a remote branch if -d or -D was specified */
2252         if (delete_branch) {
2253                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2254                         fprintf(stderr, "Unable to delete remote branch %s\n",
2255                                 refspec[0]);
2256                 goto cleanup;
2257         }
2258
2259         /* match them up */
2260         if (!remote_tail)
2261                 remote_tail = &remote_refs;
2262         if (match_refs(local_refs, remote_refs, &remote_tail,
2263                        nr_refspec, (const char **) refspec, push_all))
2264                 return -1;
2265         if (!remote_refs) {
2266                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2267                 return 0;
2268         }
2269
2270         new_refs = 0;
2271         for (ref = remote_refs; ref; ref = ref->next) {
2272                 char old_hex[60], *new_hex;
2273                 const char *commit_argv[4];
2274                 int commit_argc;
2275                 char *new_sha1_hex, *old_sha1_hex;
2276
2277                 if (!ref->peer_ref)
2278                         continue;
2279                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2280                         if (push_verbosely || 1)
2281                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2282                         continue;
2283                 }
2284
2285                 if (!force_all &&
2286                     !is_zero_sha1(ref->old_sha1) &&
2287                     !ref->force) {
2288                         if (!has_sha1_file(ref->old_sha1) ||
2289                             !ref_newer(ref->peer_ref->new_sha1,
2290                                        ref->old_sha1)) {
2291                                 /*
2292                                  * We do not have the remote ref, or
2293                                  * we know that the remote ref is not
2294                                  * an ancestor of what we are trying to
2295                                  * push.  Either way this can be losing
2296                                  * commits at the remote end and likely
2297                                  * we were not up to date to begin with.
2298                                  */
2299                                 error("remote '%s' is not an ancestor of\n"
2300                                       "local '%s'.\n"
2301                                       "Maybe you are not up-to-date and "
2302                                       "need to pull first?",
2303                                       ref->name,
2304                                       ref->peer_ref->name);
2305                                 rc = -2;
2306                                 continue;
2307                         }
2308                 }
2309                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2310                 if (is_zero_sha1(ref->new_sha1)) {
2311                         error("cannot happen anymore");
2312                         rc = -3;
2313                         continue;
2314                 }
2315                 new_refs++;
2316                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2317                 new_hex = sha1_to_hex(ref->new_sha1);
2318
2319                 fprintf(stderr, "updating '%s'", ref->name);
2320                 if (strcmp(ref->name, ref->peer_ref->name))
2321                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2322                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2323                 if (dry_run)
2324                         continue;
2325
2326                 /* Lock remote branch ref */
2327                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2328                 if (ref_lock == NULL) {
2329                         fprintf(stderr, "Unable to lock remote branch %s\n",
2330                                 ref->name);
2331                         rc = 1;
2332                         continue;
2333                 }
2334
2335                 /* Set up revision info for this refspec */
2336                 commit_argc = 3;
2337                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2338                 old_sha1_hex = NULL;
2339                 commit_argv[1] = "--objects";
2340                 commit_argv[2] = new_sha1_hex;
2341                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2342                         old_sha1_hex = xmalloc(42);
2343                         sprintf(old_sha1_hex, "^%s",
2344                                 sha1_to_hex(ref->old_sha1));
2345                         commit_argv[3] = old_sha1_hex;
2346                         commit_argc++;
2347                 }
2348                 init_revisions(&revs, setup_git_directory());
2349                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2350                 free(new_sha1_hex);
2351                 if (old_sha1_hex) {
2352                         free(old_sha1_hex);
2353                         commit_argv[1] = NULL;
2354                 }
2355
2356                 /* Generate a list of objects that need to be pushed */
2357                 pushing = 0;
2358                 prepare_revision_walk(&revs);
2359                 mark_edges_uninteresting(revs.commits);
2360                 objects_to_send = get_delta(&revs, ref_lock);
2361                 finish_all_active_slots();
2362
2363                 /* Push missing objects to remote, this would be a
2364                    convenient time to pack them first if appropriate. */
2365                 pushing = 1;
2366                 if (objects_to_send)
2367                         fprintf(stderr, "    sending %d objects\n",
2368                                 objects_to_send);
2369 #ifdef USE_CURL_MULTI
2370                 fill_active_slots();
2371                 add_fill_function(NULL, fill_active_slot);
2372 #endif
2373                 finish_all_active_slots();
2374
2375                 /* Update the remote branch if all went well */
2376                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2377                         rc = 1;
2378                         goto unlock;
2379                 }
2380
2381         unlock:
2382                 if (!rc)
2383                         fprintf(stderr, "    done\n");
2384                 unlock_remote(ref_lock);
2385                 check_locks();
2386         }
2387
2388         /* Update remote server info if appropriate */
2389         if (remote->has_info_refs && new_refs) {
2390                 if (info_ref_lock && remote->can_update_info_refs) {
2391                         fprintf(stderr, "Updating remote server info\n");
2392                         if (!dry_run)
2393                                 update_remote_info_refs(info_ref_lock);
2394                 } else {
2395                         fprintf(stderr, "Unable to update server info\n");
2396                 }
2397         }
2398         if (info_ref_lock)
2399                 unlock_remote(info_ref_lock);
2400
2401  cleanup:
2402         free(remote);
2403
2404         curl_slist_free_all(no_pragma_header);
2405
2406         http_cleanup();
2407
2408         request = request_queue_head;
2409         while (request != NULL) {
2410                 next_request = request->next;
2411                 release_request(request);
2412                 request = next_request;
2413         }
2414
2415         return rc;
2416 }