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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5 #include "tag.h"
   6 #include "blob.h"
   7 #include "http.h"
   8 #include "refs.h"
   9 #include "diff.h"
  10 #include "revision.h"
  11 #include "exec_cmd.h"
  12
  13 #include <expat.h>
  14
  15 static const char http_push_usage[] =
  16 "git-http-push [--all] [--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 static struct curl_slist *default_headers;
  79
  80 static int push_verbosely;
  81 static int push_all;
  82 static int force_all;
  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 = write(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 = read(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, SEEK_SET, 0);
 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                         filename);
 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         char type[20];
 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", 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         request->buffer.buffer = xmalloc(size);
 498
 499         /* Compress it */
 500         stream.next_out = request->buffer.buffer;
 501         stream.avail_out = size;
 502
 503         /* First header.. */
 504         stream.next_in = (void *)hdr;
 505         stream.avail_in = hdrlen;
 506         while (deflate(&stream, 0) == Z_OK)
 507                 /* nothing */;
 508
 509         /* Then the data itself.. */
 510         stream.next_in = unpacked;
 511         stream.avail_in = len;
 512         while (deflate(&stream, Z_FINISH) == Z_OK)
 513                 /* nothing */;
 514         deflateEnd(&stream);
 515         free(unpacked);
 516
 517         request->buffer.size = stream.total_out;
 518         request->buffer.posn = 0;
 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.size);
 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                         fclose(request->local_stream);
 774                         request->local_stream = NULL;
 775                         if (!move_temp_to_file(request->tmpfile,
 776                                                request->filename)) {
 777                                 target = (struct packed_git *)request->userData;
 778                                 lst = &remote->packs;
 779                                 while (*lst != target)
 780                                         lst = &((*lst)->next);
 781                                 *lst = (*lst)->next;
 782
 783                                 if (!verify_pack(target, 0))
 784                                         install_packed_git(target);
 785                                 else
 786                                         remote->can_update_info_refs = 0;
 787                         }
 788                 }
 789                 release_request(request);
 790         }
 791 }
 792
 793 #ifdef USE_CURL_MULTI
 794 void fill_active_slots(void)
 795 {
 796         struct transfer_request *request = request_queue_head;
 797         struct transfer_request *next;
 798         struct active_request_slot *slot = active_queue_head;
 799         int num_transfers;
 800
 801         if (aborted)
 802                 return;
 803
 804         while (active_requests < max_requests && request != NULL) {
 805                 next = request->next;
 806                 if (request->state == NEED_FETCH) {
 807                         start_fetch_loose(request);
 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                         curl_multi_perform(curlm, &num_transfers);
 815                 }
 816                 request = next;
 817         }
 818
 819         while (slot != NULL) {
 820                 if (!slot->in_use && slot->curl != NULL) {
 821                         curl_easy_cleanup(slot->curl);
 822                         slot->curl = NULL;
 823                 }
 824                 slot = slot->next;
 825         }
 826 }
 827 #endif
 828
 829 static void get_remote_object_list(unsigned char parent);
 830
 831 static void add_fetch_request(struct object *obj)
 832 {
 833         struct transfer_request *request;
 834
 835         check_locks();
 836
 837         /*
 838          * Don't fetch the object if it's known to exist locally
 839          * or is already in the request queue
 840          */
 841         if (remote_dir_exists[obj->sha1[0]] == -1)
 842                 get_remote_object_list(obj->sha1[0]);
 843         if (obj->flags & (LOCAL | FETCHING))
 844                 return;
 845
 846         obj->flags |= FETCHING;
 847         request = xmalloc(sizeof(*request));
 848         request->obj = obj;
 849         request->url = NULL;
 850         request->lock = NULL;
 851         request->headers = NULL;
 852         request->local_fileno = -1;
 853         request->local_stream = NULL;
 854         request->state = NEED_FETCH;
 855         request->next = request_queue_head;
 856         request_queue_head = request;
 857
 858 #ifdef USE_CURL_MULTI
 859         fill_active_slots();
 860         step_active_slots();
 861 #endif
 862 }
 863
 864 static int add_send_request(struct object *obj, struct remote_lock *lock)
 865 {
 866         struct transfer_request *request = request_queue_head;
 867         struct packed_git *target;
 868
 869         /* Keep locks active */
 870         check_locks();
 871
 872         /*
 873          * Don't push the object if it's known to exist on the remote
 874          * or is already in the request queue
 875          */
 876         if (remote_dir_exists[obj->sha1[0]] == -1)
 877                 get_remote_object_list(obj->sha1[0]);
 878         if (obj->flags & (REMOTE | PUSHING))
 879                 return 0;
 880         target = find_sha1_pack(obj->sha1, remote->packs);
 881         if (target) {
 882                 obj->flags |= REMOTE;
 883                 return 0;
 884         }
 885
 886         obj->flags |= PUSHING;
 887         request = xmalloc(sizeof(*request));
 888         request->obj = obj;
 889         request->url = NULL;
 890         request->lock = lock;
 891         request->headers = NULL;
 892         request->local_fileno = -1;
 893         request->local_stream = NULL;
 894         request->state = NEED_PUSH;
 895         request->next = request_queue_head;
 896         request_queue_head = request;
 897
 898 #ifdef USE_CURL_MULTI
 899         fill_active_slots();
 900         step_active_slots();
 901 #endif
 902
 903         return 1;
 904 }
 905
 906 static int fetch_index(unsigned char *sha1)
 907 {
 908         char *hex = sha1_to_hex(sha1);
 909         char *filename;
 910         char *url;
 911         char tmpfile[PATH_MAX];
 912         long prev_posn = 0;
 913         char range[RANGE_HEADER_SIZE];
 914         struct curl_slist *range_header = NULL;
 915
 916         FILE *indexfile;
 917         struct active_request_slot *slot;
 918         struct slot_results results;
 919
 920         /* Don't use the index if the pack isn't there */
 921         url = xmalloc(strlen(remote->url) + 64);
 922         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 923         slot = get_active_slot();
 924         slot->results = &results;
 925         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 926         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 927         if (start_active_slot(slot)) {
 928                 run_active_slot(slot);
 929                 if (results.curl_result != CURLE_OK) {
 930                         free(url);
 931                         return error("Unable to verify pack %s is available",
 932                                      hex);
 933                 }
 934         } else {
 935                 return error("Unable to start request");
 936         }
 937
 938         if (has_pack_index(sha1))
 939                 return 0;
 940
 941         if (push_verbosely)
 942                 fprintf(stderr, "Getting index for pack %s\n", hex);
 943
 944         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 945
 946         filename = sha1_pack_index_name(sha1);
 947         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 948         indexfile = fopen(tmpfile, "a");
 949         if (!indexfile)
 950                 return error("Unable to open local file %s for pack index",
 951                              filename);
 952
 953         slot = get_active_slot();
 954         slot->results = &results;
 955         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 956         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 957         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 958         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 959         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 960         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 961         slot->local = indexfile;
 962
 963         /* If there is data present from a previous transfer attempt,
 964            resume where it left off */
 965         prev_posn = ftell(indexfile);
 966         if (prev_posn>0) {
 967                 if (push_verbosely)
 968                         fprintf(stderr,
 969                                 "Resuming fetch of index for pack %s at byte %ld\n",
 970                                 hex, prev_posn);
 971                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 972                 range_header = curl_slist_append(range_header, range);
 973                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 974         }
 975
 976         if (start_active_slot(slot)) {
 977                 run_active_slot(slot);
 978                 if (results.curl_result != CURLE_OK) {
 979                         free(url);
 980                         fclose(indexfile);
 981                         return error("Unable to get pack index %s\n%s", url,
 982                                      curl_errorstr);
 983                 }
 984         } else {
 985                 free(url);
 986                 fclose(indexfile);
 987                 return error("Unable to start request");
 988         }
 989
 990         free(url);
 991         fclose(indexfile);
 992
 993         return move_temp_to_file(tmpfile, filename);
 994 }
 995
 996 static int setup_index(unsigned char *sha1)
 997 {
 998         struct packed_git *new_pack;
 999
1000         if (fetch_index(sha1))
1001                 return -1;
1002
1003         new_pack = parse_pack_index(sha1);
1004         new_pack->next = remote->packs;
1005         remote->packs = new_pack;
1006         return 0;
1007 }
1008
1009 static int fetch_indices(void)
1010 {
1011         unsigned char sha1[20];
1012         char *url;
1013         struct buffer buffer;
1014         char *data;
1015         int i = 0;
1016
1017         struct active_request_slot *slot;
1018         struct slot_results results;
1019
1020         data = xcalloc(1, 4096);
1021         buffer.size = 4096;
1022         buffer.posn = 0;
1023         buffer.buffer = data;
1024
1025         if (push_verbosely)
1026                 fprintf(stderr, "Getting pack list\n");
1027
1028         url = xmalloc(strlen(remote->url) + 20);
1029         sprintf(url, "%sobjects/info/packs", remote->url);
1030
1031         slot = get_active_slot();
1032         slot->results = &results;
1033         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1034         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1035         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1036         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1037         if (start_active_slot(slot)) {
1038                 run_active_slot(slot);
1039                 if (results.curl_result != CURLE_OK) {
1040                         free(buffer.buffer);
1041                         free(url);
1042                         if (results.http_code == 404)
1043                                 return 0;
1044                         else
1045                                 return error("%s", curl_errorstr);
1046                 }
1047         } else {
1048                 free(buffer.buffer);
1049                 free(url);
1050                 return error("Unable to start request");
1051         }
1052         free(url);
1053
1054         data = buffer.buffer;
1055         while (i < buffer.posn) {
1056                 switch (data[i]) {
1057                 case 'P':
1058                         i++;
1059                         if (i + 52 < buffer.posn &&
1060                             !strncmp(data + i, " pack-", 6) &&
1061                             !strncmp(data + i + 46, ".pack\n", 6)) {
1062                                 get_sha1_hex(data + i + 6, sha1);
1063                                 setup_index(sha1);
1064                                 i += 51;
1065                                 break;
1066                         }
1067                 default:
1068                         while (data[i] != '\n')
1069                                 i++;
1070                 }
1071                 i++;
1072         }
1073
1074         free(buffer.buffer);
1075         return 0;
1076 }
1077
1078 static inline int needs_quote(int ch)
1079 {
1080         if (((ch >= 'A') && (ch <= 'Z'))
1081                         || ((ch >= 'a') && (ch <= 'z'))
1082                         || ((ch >= '0') && (ch <= '9'))
1083                         || (ch == '/')
1084                         || (ch == '-')
1085                         || (ch == '.'))
1086                 return 0;
1087         return 1;
1088 }
1089
1090 static inline int hex(int v)
1091 {
1092         if (v < 10) return '0' + v;
1093         else return 'A' + v - 10;
1094 }
1095
1096 static char *quote_ref_url(const char *base, const char *ref)
1097 {
1098         const char *cp;
1099         char *dp, *qref;
1100         int len, baselen, ch;
1101
1102         baselen = strlen(base);
1103         len = baselen + 1;
1104         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1105                 if (needs_quote(ch))
1106                         len += 2; /* extra two hex plus replacement % */
1107         qref = xmalloc(len);
1108         memcpy(qref, base, baselen);
1109         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1110                 if (needs_quote(ch)) {
1111                         *dp++ = '%';
1112                         *dp++ = hex((ch >> 4) & 0xF);
1113                         *dp++ = hex(ch & 0xF);
1114                 }
1115                 else
1116                         *dp++ = ch;
1117         }
1118         *dp = 0;
1119
1120         return qref;
1121 }
1122
1123 int fetch_ref(char *ref, unsigned char *sha1)
1124 {
1125         char *url;
1126         char hex[42];
1127         struct buffer buffer;
1128         char *base = remote->url;
1129         struct active_request_slot *slot;
1130         struct slot_results results;
1131         buffer.size = 41;
1132         buffer.posn = 0;
1133         buffer.buffer = hex;
1134         hex[41] = '\0';
1135
1136         url = quote_ref_url(base, ref);
1137         slot = get_active_slot();
1138         slot->results = &results;
1139         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1140         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1141         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1142         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1143         if (start_active_slot(slot)) {
1144                 run_active_slot(slot);
1145                 if (results.curl_result != CURLE_OK)
1146                         return error("Couldn't get %s for %s\n%s",
1147                                      url, ref, curl_errorstr);
1148         } else {
1149                 return error("Unable to start request");
1150         }
1151
1152         hex[40] = '\0';
1153         get_sha1_hex(hex, sha1);
1154         return 0;
1155 }
1156
1157 static void one_remote_object(const char *hex)
1158 {
1159         unsigned char sha1[20];
1160         struct object *obj;
1161
1162         if (get_sha1_hex(hex, sha1) != 0)
1163                 return;
1164
1165         obj = lookup_object(sha1);
1166         if (!obj)
1167                 obj = parse_object(sha1);
1168
1169         /* Ignore remote objects that don't exist locally */
1170         if (!obj)
1171                 return;
1172
1173         obj->flags |= REMOTE;
1174         if (!object_list_contains(objects, obj))
1175                 object_list_insert(obj, &objects);
1176 }
1177
1178 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1179 {
1180         int *lock_flags = (int *)ctx->userData;
1181
1182         if (tag_closed) {
1183                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1184                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1185                             (*lock_flags & DAV_PROP_LOCKWR)) {
1186                                 *lock_flags |= DAV_LOCK_OK;
1187                         }
1188                         *lock_flags &= DAV_LOCK_OK;
1189                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1190                         *lock_flags |= DAV_PROP_LOCKWR;
1191                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1192                         *lock_flags |= DAV_PROP_LOCKEX;
1193                 }
1194         }
1195 }
1196
1197 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1198 {
1199         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1200
1201         if (tag_closed && ctx->cdata) {
1202                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1203                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1204                         strcpy(lock->owner, ctx->cdata);
1205                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1206                         if (!strncmp(ctx->cdata, "Second-", 7))
1207                                 lock->timeout =
1208                                         strtol(ctx->cdata + 7, NULL, 10);
1209                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1210                         if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
1211                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1212                                 strcpy(lock->token, ctx->cdata + 16);
1213                         }
1214                 }
1215         }
1216 }
1217
1218 static void one_remote_ref(char *refname);
1219
1220 static void
1221 xml_start_tag(void *userData, const char *name, const char **atts)
1222 {
1223         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1224         const char *c = strchr(name, ':');
1225         int new_len;
1226
1227         if (c == NULL)
1228                 c = name;
1229         else
1230                 c++;
1231
1232         new_len = strlen(ctx->name) + strlen(c) + 2;
1233
1234         if (new_len > ctx->len) {
1235                 ctx->name = xrealloc(ctx->name, new_len);
1236                 ctx->len = new_len;
1237         }
1238         strcat(ctx->name, ".");
1239         strcat(ctx->name, c);
1240
1241         free(ctx->cdata);
1242         ctx->cdata = NULL;
1243
1244         ctx->userFunc(ctx, 0);
1245 }
1246
1247 static void
1248 xml_end_tag(void *userData, const char *name)
1249 {
1250         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1251         const char *c = strchr(name, ':');
1252         char *ep;
1253
1254         ctx->userFunc(ctx, 1);
1255
1256         if (c == NULL)
1257                 c = name;
1258         else
1259                 c++;
1260
1261         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1262         *ep = 0;
1263 }
1264
1265 static void
1266 xml_cdata(void *userData, const XML_Char *s, int len)
1267 {
1268         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1269         free(ctx->cdata);
1270         ctx->cdata = xmalloc(len + 1);
1271         strlcpy(ctx->cdata, s, len + 1);
1272 }
1273
1274 static struct remote_lock *lock_remote(const char *path, long timeout)
1275 {
1276         struct active_request_slot *slot;
1277         struct slot_results results;
1278         struct buffer out_buffer;
1279         struct buffer in_buffer;
1280         char *out_data;
1281         char *in_data;
1282         char *url;
1283         char *ep;
1284         char timeout_header[25];
1285         struct remote_lock *lock = NULL;
1286         XML_Parser parser = XML_ParserCreate(NULL);
1287         enum XML_Status result;
1288         struct curl_slist *dav_headers = NULL;
1289         struct xml_ctx ctx;
1290
1291         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1292         sprintf(url, "%s%s", remote->url, path);
1293
1294         /* Make sure leading directories exist for the remote ref */
1295         ep = strchr(url + strlen(remote->url) + 11, '/');
1296         while (ep) {
1297                 *ep = 0;
1298                 slot = get_active_slot();
1299                 slot->results = &results;
1300                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1301                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1302                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1303                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1304                 if (start_active_slot(slot)) {
1305                         run_active_slot(slot);
1306                         if (results.curl_result != CURLE_OK &&
1307                             results.http_code != 405) {
1308                                 fprintf(stderr,
1309                                         "Unable to create branch path %s\n",
1310                                         url);
1311                                 free(url);
1312                                 return NULL;
1313                         }
1314                 } else {
1315                         fprintf(stderr, "Unable to start MKCOL request\n");
1316                         free(url);
1317                         return NULL;
1318                 }
1319                 *ep = '/';
1320                 ep = strchr(ep + 1, '/');
1321         }
1322
1323         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1324         out_data = xmalloc(out_buffer.size + 1);
1325         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1326         out_buffer.posn = 0;
1327         out_buffer.buffer = out_data;
1328
1329         in_buffer.size = 4096;
1330         in_data = xmalloc(in_buffer.size);
1331         in_buffer.posn = 0;
1332         in_buffer.buffer = in_data;
1333
1334         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1335         dav_headers = curl_slist_append(dav_headers, timeout_header);
1336         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1337
1338         slot = get_active_slot();
1339         slot->results = &results;
1340         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1341         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1342         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1343         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1344         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1345         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1346         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1347         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1348         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1349
1350         lock = xcalloc(1, sizeof(*lock));
1351         lock->timeout = -1;
1352
1353         if (start_active_slot(slot)) {
1354                 run_active_slot(slot);
1355                 if (results.curl_result == CURLE_OK) {
1356                         ctx.name = xcalloc(10, 1);
1357                         ctx.len = 0;
1358                         ctx.cdata = NULL;
1359                         ctx.userFunc = handle_new_lock_ctx;
1360                         ctx.userData = lock;
1361                         XML_SetUserData(parser, &ctx);
1362                         XML_SetElementHandler(parser, xml_start_tag,
1363                                               xml_end_tag);
1364                         XML_SetCharacterDataHandler(parser, xml_cdata);
1365                         result = XML_Parse(parser, in_buffer.buffer,
1366                                            in_buffer.posn, 1);
1367                         free(ctx.name);
1368                         if (result != XML_STATUS_OK) {
1369                                 fprintf(stderr, "XML error: %s\n",
1370                                         XML_ErrorString(
1371                                                 XML_GetErrorCode(parser)));
1372                                 lock->timeout = -1;
1373                         }
1374                 }
1375         } else {
1376                 fprintf(stderr, "Unable to start LOCK request\n");
1377         }
1378
1379         curl_slist_free_all(dav_headers);
1380         free(out_data);
1381         free(in_data);
1382
1383         if (lock->token == NULL || lock->timeout <= 0) {
1384                 if (lock->token != NULL)
1385                         free(lock->token);
1386                 if (lock->owner != NULL)
1387                         free(lock->owner);
1388                 free(url);
1389                 free(lock);
1390                 lock = NULL;
1391         } else {
1392                 lock->url = url;
1393                 lock->start_time = time(NULL);
1394                 lock->next = remote->locks;
1395                 remote->locks = lock;
1396         }
1397
1398         return lock;
1399 }
1400
1401 static int unlock_remote(struct remote_lock *lock)
1402 {
1403         struct active_request_slot *slot;
1404         struct slot_results results;
1405         struct remote_lock *prev = remote->locks;
1406         char *lock_token_header;
1407         struct curl_slist *dav_headers = NULL;
1408         int rc = 0;
1409
1410         lock_token_header = xmalloc(strlen(lock->token) + 31);
1411         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1412                 lock->token);
1413         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1414
1415         slot = get_active_slot();
1416         slot->results = &results;
1417         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1418         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1419         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1420         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1421
1422         if (start_active_slot(slot)) {
1423                 run_active_slot(slot);
1424                 if (results.curl_result == CURLE_OK)
1425                         rc = 1;
1426                 else
1427                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1428                                 results.http_code);
1429         } else {
1430                 fprintf(stderr, "Unable to start UNLOCK request\n");
1431         }
1432
1433         curl_slist_free_all(dav_headers);
1434         free(lock_token_header);
1435
1436         if (remote->locks == lock) {
1437                 remote->locks = lock->next;
1438         } else {
1439                 while (prev && prev->next != lock)
1440                         prev = prev->next;
1441                 if (prev)
1442                         prev->next = prev->next->next;
1443         }
1444
1445         if (lock->owner != NULL)
1446                 free(lock->owner);
1447         free(lock->url);
1448         free(lock->token);
1449         free(lock);
1450
1451         return rc;
1452 }
1453
1454 static void remote_ls(const char *path, int flags,
1455                       void (*userFunc)(struct remote_ls_ctx *ls),
1456                       void *userData);
1457
1458 static void process_ls_object(struct remote_ls_ctx *ls)
1459 {
1460         unsigned int *parent = (unsigned int *)ls->userData;
1461         char *path = ls->dentry_name;
1462         char *obj_hex;
1463
1464         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1465                 remote_dir_exists[*parent] = 1;
1466                 return;
1467         }
1468
1469         if (strlen(path) != 49)
1470                 return;
1471         path += 8;
1472         obj_hex = xmalloc(strlen(path));
1473         strlcpy(obj_hex, path, 3);
1474         strcpy(obj_hex + 2, path + 3);
1475         one_remote_object(obj_hex);
1476         free(obj_hex);
1477 }
1478
1479 static void process_ls_ref(struct remote_ls_ctx *ls)
1480 {
1481         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1482                 fprintf(stderr, "  %s\n", ls->dentry_name);
1483                 return;
1484         }
1485
1486         if (!(ls->dentry_flags & IS_DIR))
1487                 one_remote_ref(ls->dentry_name);
1488 }
1489
1490 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1491 {
1492         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1493
1494         if (tag_closed) {
1495                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1496                         if (ls->dentry_flags & IS_DIR) {
1497                                 if (ls->flags & PROCESS_DIRS) {
1498                                         ls->userFunc(ls);
1499                                 }
1500                                 if (strcmp(ls->dentry_name, ls->path) &&
1501                                     ls->flags & RECURSIVE) {
1502                                         remote_ls(ls->dentry_name,
1503                                                   ls->flags,
1504                                                   ls->userFunc,
1505                                                   ls->userData);
1506                                 }
1507                         } else if (ls->flags & PROCESS_FILES) {
1508                                 ls->userFunc(ls);
1509                         }
1510                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1511                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1512                                                   remote->path_len + 1);
1513                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1514                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1515                         ls->dentry_flags |= IS_DIR;
1516                 }
1517         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1518                 free(ls->dentry_name);
1519                 ls->dentry_name = NULL;
1520                 ls->dentry_flags = 0;
1521         }
1522 }
1523
1524 static void remote_ls(const char *path, int flags,
1525                       void (*userFunc)(struct remote_ls_ctx *ls),
1526                       void *userData)
1527 {
1528         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1529         struct active_request_slot *slot;
1530         struct slot_results results;
1531         struct buffer in_buffer;
1532         struct buffer out_buffer;
1533         char *in_data;
1534         char *out_data;
1535         XML_Parser parser = XML_ParserCreate(NULL);
1536         enum XML_Status result;
1537         struct curl_slist *dav_headers = NULL;
1538         struct xml_ctx ctx;
1539         struct remote_ls_ctx ls;
1540
1541         ls.flags = flags;
1542         ls.path = xstrdup(path);
1543         ls.dentry_name = NULL;
1544         ls.dentry_flags = 0;
1545         ls.userData = userData;
1546         ls.userFunc = userFunc;
1547
1548         sprintf(url, "%s%s", remote->url, path);
1549
1550         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1551         out_data = xmalloc(out_buffer.size + 1);
1552         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1553         out_buffer.posn = 0;
1554         out_buffer.buffer = out_data;
1555
1556         in_buffer.size = 4096;
1557         in_data = xmalloc(in_buffer.size);
1558         in_buffer.posn = 0;
1559         in_buffer.buffer = in_data;
1560
1561         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1562         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1563
1564         slot = get_active_slot();
1565         slot->results = &results;
1566         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1567         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1568         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1569         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1571         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1572         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1573         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1574         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1575
1576         if (start_active_slot(slot)) {
1577                 run_active_slot(slot);
1578                 if (results.curl_result == CURLE_OK) {
1579                         ctx.name = xcalloc(10, 1);
1580                         ctx.len = 0;
1581                         ctx.cdata = NULL;
1582                         ctx.userFunc = handle_remote_ls_ctx;
1583                         ctx.userData = &ls;
1584                         XML_SetUserData(parser, &ctx);
1585                         XML_SetElementHandler(parser, xml_start_tag,
1586                                               xml_end_tag);
1587                         XML_SetCharacterDataHandler(parser, xml_cdata);
1588                         result = XML_Parse(parser, in_buffer.buffer,
1589                                            in_buffer.posn, 1);
1590                         free(ctx.name);
1591
1592                         if (result != XML_STATUS_OK) {
1593                                 fprintf(stderr, "XML error: %s\n",
1594                                         XML_ErrorString(
1595                                                 XML_GetErrorCode(parser)));
1596                         }
1597                 }
1598         } else {
1599                 fprintf(stderr, "Unable to start PROPFIND request\n");
1600         }
1601
1602         free(ls.path);
1603         free(url);
1604         free(out_data);
1605         free(in_buffer.buffer);
1606         curl_slist_free_all(dav_headers);
1607 }
1608
1609 static void get_remote_object_list(unsigned char parent)
1610 {
1611         char path[] = "objects/XX/";
1612         static const char hex[] = "0123456789abcdef";
1613         unsigned int val = parent;
1614
1615         path[8] = hex[val >> 4];
1616         path[9] = hex[val & 0xf];
1617         remote_dir_exists[val] = 0;
1618         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1619                   process_ls_object, &val);
1620 }
1621
1622 static int locking_available(void)
1623 {
1624         struct active_request_slot *slot;
1625         struct slot_results results;
1626         struct buffer in_buffer;
1627         struct buffer out_buffer;
1628         char *in_data;
1629         char *out_data;
1630         XML_Parser parser = XML_ParserCreate(NULL);
1631         enum XML_Status result;
1632         struct curl_slist *dav_headers = NULL;
1633         struct xml_ctx ctx;
1634         int lock_flags = 0;
1635
1636         out_buffer.size =
1637                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1638                 strlen(remote->url) - 2;
1639         out_data = xmalloc(out_buffer.size + 1);
1640         snprintf(out_data, out_buffer.size + 1,
1641                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1642         out_buffer.posn = 0;
1643         out_buffer.buffer = out_data;
1644
1645         in_buffer.size = 4096;
1646         in_data = xmalloc(in_buffer.size);
1647         in_buffer.posn = 0;
1648         in_buffer.buffer = in_data;
1649
1650         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1651         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1652
1653         slot = get_active_slot();
1654         slot->results = &results;
1655         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1656         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1657         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1658         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1659         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1660         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1661         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1662         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1663         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1664
1665         if (start_active_slot(slot)) {
1666                 run_active_slot(slot);
1667                 if (results.curl_result == CURLE_OK) {
1668                         ctx.name = xcalloc(10, 1);
1669                         ctx.len = 0;
1670                         ctx.cdata = NULL;
1671                         ctx.userFunc = handle_lockprop_ctx;
1672                         ctx.userData = &lock_flags;
1673                         XML_SetUserData(parser, &ctx);
1674                         XML_SetElementHandler(parser, xml_start_tag,
1675                                               xml_end_tag);
1676                         result = XML_Parse(parser, in_buffer.buffer,
1677                                            in_buffer.posn, 1);
1678                         free(ctx.name);
1679
1680                         if (result != XML_STATUS_OK) {
1681                                 fprintf(stderr, "XML error: %s\n",
1682                                         XML_ErrorString(
1683                                                 XML_GetErrorCode(parser)));
1684                                 lock_flags = 0;
1685                         }
1686                 }
1687         } else {
1688                 fprintf(stderr, "Unable to start PROPFIND request\n");
1689         }
1690
1691         free(out_data);
1692         free(in_buffer.buffer);
1693         curl_slist_free_all(dav_headers);
1694
1695         return lock_flags;
1696 }
1697
1698 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1699 {
1700         struct object_list *entry = xmalloc(sizeof(struct object_list));
1701         entry->item = obj;
1702         entry->next = *p;
1703         *p = entry;
1704         return &entry->next;
1705 }
1706
1707 static struct object_list **process_blob(struct blob *blob,
1708                                          struct object_list **p,
1709                                          struct name_path *path,
1710                                          const char *name)
1711 {
1712         struct object *obj = &blob->object;
1713
1714         obj->flags |= LOCAL;
1715
1716         if (obj->flags & (UNINTERESTING | SEEN))
1717                 return p;
1718
1719         obj->flags |= SEEN;
1720         return add_one_object(obj, p);
1721 }
1722
1723 static struct object_list **process_tree(struct tree *tree,
1724                                          struct object_list **p,
1725                                          struct name_path *path,
1726                                          const char *name)
1727 {
1728         struct object *obj = &tree->object;
1729         struct tree_desc desc;
1730         struct name_entry entry;
1731         struct name_path me;
1732
1733         obj->flags |= LOCAL;
1734
1735         if (obj->flags & (UNINTERESTING | SEEN))
1736                 return p;
1737         if (parse_tree(tree) < 0)
1738                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1739
1740         obj->flags |= SEEN;
1741         name = xstrdup(name);
1742         p = add_one_object(obj, p);
1743         me.up = path;
1744         me.elem = name;
1745         me.elem_len = strlen(name);
1746
1747         desc.buf = tree->buffer;
1748         desc.size = tree->size;
1749
1750         while (tree_entry(&desc, &entry)) {
1751                 if (S_ISDIR(entry.mode))
1752                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1753                 else
1754                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1755         }
1756         free(tree->buffer);
1757         tree->buffer = NULL;
1758         return p;
1759 }
1760
1761 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1762 {
1763         int i;
1764         struct commit *commit;
1765         struct object_list **p = &objects;
1766         int count = 0;
1767
1768         while ((commit = get_revision(revs)) != NULL) {
1769                 p = process_tree(commit->tree, p, NULL, "");
1770                 commit->object.flags |= LOCAL;
1771                 if (!(commit->object.flags & UNINTERESTING))
1772                         count += add_send_request(&commit->object, lock);
1773         }
1774
1775         for (i = 0; i < revs->pending.nr; i++) {
1776                 struct object_array_entry *entry = revs->pending.objects + i;
1777                 struct object *obj = entry->item;
1778                 const char *name = entry->name;
1779
1780                 if (obj->flags & (UNINTERESTING | SEEN))
1781                         continue;
1782                 if (obj->type == OBJ_TAG) {
1783                         obj->flags |= SEEN;
1784                         p = add_one_object(obj, p);
1785                         continue;
1786                 }
1787                 if (obj->type == OBJ_TREE) {
1788                         p = process_tree((struct tree *)obj, p, NULL, name);
1789                         continue;
1790                 }
1791                 if (obj->type == OBJ_BLOB) {
1792                         p = process_blob((struct blob *)obj, p, NULL, name);
1793                         continue;
1794                 }
1795                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1796         }
1797
1798         while (objects) {
1799                 if (!(objects->item->flags & UNINTERESTING))
1800                         count += add_send_request(objects->item, lock);
1801                 objects = objects->next;
1802         }
1803
1804         return count;
1805 }
1806
1807 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1808 {
1809         struct active_request_slot *slot;
1810         struct slot_results results;
1811         char *out_data;
1812         char *if_header;
1813         struct buffer out_buffer;
1814         struct curl_slist *dav_headers = NULL;
1815         int i;
1816
1817         if_header = xmalloc(strlen(lock->token) + 25);
1818         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1819         dav_headers = curl_slist_append(dav_headers, if_header);
1820
1821         out_buffer.size = 41;
1822         out_data = xmalloc(out_buffer.size + 1);
1823         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1824         if (i != out_buffer.size) {
1825                 fprintf(stderr, "Unable to initialize PUT request body\n");
1826                 return 0;
1827         }
1828         out_buffer.posn = 0;
1829         out_buffer.buffer = out_data;
1830
1831         slot = get_active_slot();
1832         slot->results = &results;
1833         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1834         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1835         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1836         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1837         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1838         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1839         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1840         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1841         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1842
1843         if (start_active_slot(slot)) {
1844                 run_active_slot(slot);
1845                 free(out_data);
1846                 free(if_header);
1847                 if (results.curl_result != CURLE_OK) {
1848                         fprintf(stderr,
1849                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1850                                 results.curl_result, results.http_code);
1851                         /* We should attempt recovery? */
1852                         return 0;
1853                 }
1854         } else {
1855                 free(out_data);
1856                 free(if_header);
1857                 fprintf(stderr, "Unable to start PUT request\n");
1858                 return 0;
1859         }
1860
1861         return 1;
1862 }
1863
1864 static struct ref *local_refs, **local_tail;
1865 static struct ref *remote_refs, **remote_tail;
1866
1867 static int one_local_ref(const char *refname, const unsigned char *sha1)
1868 {
1869         struct ref *ref;
1870         int len = strlen(refname) + 1;
1871         ref = xcalloc(1, sizeof(*ref) + len);
1872         hashcpy(ref->new_sha1, sha1);
1873         memcpy(ref->name, refname, len);
1874         *local_tail = ref;
1875         local_tail = &ref->next;
1876         return 0;
1877 }
1878
1879 static void one_remote_ref(char *refname)
1880 {
1881         struct ref *ref;
1882         unsigned char remote_sha1[20];
1883         struct object *obj;
1884         int len = strlen(refname) + 1;
1885
1886         if (fetch_ref(refname, remote_sha1) != 0) {
1887                 fprintf(stderr,
1888                         "Unable to fetch ref %s from %s\n",
1889                         refname, remote->url);
1890                 return;
1891         }
1892
1893         /*
1894          * Fetch a copy of the object if it doesn't exist locally - it
1895          * may be required for updating server info later.
1896          */
1897         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1898                 obj = lookup_unknown_object(remote_sha1);
1899                 if (obj) {
1900                         fprintf(stderr, "  fetch %s for %s\n",
1901                                 sha1_to_hex(remote_sha1), refname);
1902                         add_fetch_request(obj);
1903                 }
1904         }
1905
1906         ref = xcalloc(1, sizeof(*ref) + len);
1907         hashcpy(ref->old_sha1, remote_sha1);
1908         memcpy(ref->name, refname, len);
1909         *remote_tail = ref;
1910         remote_tail = &ref->next;
1911 }
1912
1913 static void get_local_heads(void)
1914 {
1915         local_tail = &local_refs;
1916         for_each_ref(one_local_ref);
1917 }
1918
1919 static void get_dav_remote_heads(void)
1920 {
1921         remote_tail = &remote_refs;
1922         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1923 }
1924
1925 static int is_zero_sha1(const unsigned char *sha1)
1926 {
1927         int i;
1928
1929         for (i = 0; i < 20; i++) {
1930                 if (*sha1++)
1931                         return 0;
1932         }
1933         return 1;
1934 }
1935
1936 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1937 {
1938         while (list) {
1939                 struct commit_list *temp = list;
1940                 temp->item->object.flags &= ~mark;
1941                 list = temp->next;
1942                 free(temp);
1943         }
1944 }
1945
1946 static int ref_newer(const unsigned char *new_sha1,
1947                      const unsigned char *old_sha1)
1948 {
1949         struct object *o;
1950         struct commit *old, *new;
1951         struct commit_list *list, *used;
1952         int found = 0;
1953
1954         /* Both new and old must be commit-ish and new is descendant of
1955          * old.  Otherwise we require --force.
1956          */
1957         o = deref_tag(parse_object(old_sha1), NULL, 0);
1958         if (!o || o->type != OBJ_COMMIT)
1959                 return 0;
1960         old = (struct commit *) o;
1961
1962         o = deref_tag(parse_object(new_sha1), NULL, 0);
1963         if (!o || o->type != OBJ_COMMIT)
1964                 return 0;
1965         new = (struct commit *) o;
1966
1967         if (parse_commit(new) < 0)
1968                 return 0;
1969
1970         used = list = NULL;
1971         commit_list_insert(new, &list);
1972         while (list) {
1973                 new = pop_most_recent_commit(&list, TMP_MARK);
1974                 commit_list_insert(new, &used);
1975                 if (new == old) {
1976                         found = 1;
1977                         break;
1978                 }
1979         }
1980         unmark_and_free(list, TMP_MARK);
1981         unmark_and_free(used, TMP_MARK);
1982         return found;
1983 }
1984
1985 static void mark_edge_parents_uninteresting(struct commit *commit)
1986 {
1987         struct commit_list *parents;
1988
1989         for (parents = commit->parents; parents; parents = parents->next) {
1990                 struct commit *parent = parents->item;
1991                 if (!(parent->object.flags & UNINTERESTING))
1992                         continue;
1993                 mark_tree_uninteresting(parent->tree);
1994         }
1995 }
1996
1997 static void mark_edges_uninteresting(struct commit_list *list)
1998 {
1999         for ( ; list; list = list->next) {
2000                 struct commit *commit = list->item;
2001
2002                 if (commit->object.flags & UNINTERESTING) {
2003                         mark_tree_uninteresting(commit->tree);
2004                         continue;
2005                 }
2006                 mark_edge_parents_uninteresting(commit);
2007         }
2008 }
2009
2010 static void add_remote_info_ref(struct remote_ls_ctx *ls)
2011 {
2012         struct buffer *buf = (struct buffer *)ls->userData;
2013         unsigned char remote_sha1[20];
2014         struct object *o;
2015         int len;
2016         char *ref_info;
2017
2018         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2019                 fprintf(stderr,
2020                         "Unable to fetch ref %s from %s\n",
2021                         ls->dentry_name, remote->url);
2022                 aborted = 1;
2023                 return;
2024         }
2025
2026         o = parse_object(remote_sha1);
2027         if (!o) {
2028                 fprintf(stderr,
2029                         "Unable to parse object %s for remote ref %s\n",
2030                         sha1_to_hex(remote_sha1), ls->dentry_name);
2031                 aborted = 1;
2032                 return;
2033         }
2034
2035         len = strlen(ls->dentry_name) + 42;
2036         ref_info = xcalloc(len + 1, 1);
2037         sprintf(ref_info, "%s   %s\n",
2038                 sha1_to_hex(remote_sha1), ls->dentry_name);
2039         fwrite_buffer(ref_info, 1, len, buf);
2040         free(ref_info);
2041
2042         if (o->type == OBJ_TAG) {
2043                 o = deref_tag(o, ls->dentry_name, 0);
2044                 if (o) {
2045                         len = strlen(ls->dentry_name) + 45;
2046                         ref_info = xcalloc(len + 1, 1);
2047                         sprintf(ref_info, "%s   %s^{}\n",
2048                                 sha1_to_hex(o->sha1), ls->dentry_name);
2049                         fwrite_buffer(ref_info, 1, len, buf);
2050                         free(ref_info);
2051                 }
2052         }
2053 }
2054
2055 static void update_remote_info_refs(struct remote_lock *lock)
2056 {
2057         struct buffer buffer;
2058         struct active_request_slot *slot;
2059         struct slot_results results;
2060         char *if_header;
2061         struct curl_slist *dav_headers = NULL;
2062
2063         buffer.buffer = xcalloc(1, 4096);
2064         buffer.size = 4096;
2065         buffer.posn = 0;
2066         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2067                   add_remote_info_ref, &buffer);
2068         if (!aborted) {
2069                 if_header = xmalloc(strlen(lock->token) + 25);
2070                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2071                 dav_headers = curl_slist_append(dav_headers, if_header);
2072
2073                 slot = get_active_slot();
2074                 slot->results = &results;
2075                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2076                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2077                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2078                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2079                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2080                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2081                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2082                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2083                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2084
2085                 buffer.posn = 0;
2086
2087                 if (start_active_slot(slot)) {
2088                         run_active_slot(slot);
2089                         if (results.curl_result != CURLE_OK) {
2090                                 fprintf(stderr,
2091                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2092                                         results.curl_result, results.http_code);
2093                         }
2094                 }
2095                 free(if_header);
2096         }
2097         free(buffer.buffer);
2098 }
2099
2100 static int remote_exists(const char *path)
2101 {
2102         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2103         struct active_request_slot *slot;
2104         struct slot_results results;
2105
2106         sprintf(url, "%s%s", remote->url, path);
2107
2108         slot = get_active_slot();
2109         slot->results = &results;
2110         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2111         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2112
2113         if (start_active_slot(slot)) {
2114                 run_active_slot(slot);
2115                 if (results.http_code == 404)
2116                         return 0;
2117                 else if (results.curl_result == CURLE_OK)
2118                         return 1;
2119                 else
2120                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2121         } else {
2122                 fprintf(stderr, "Unable to start HEAD request\n");
2123         }
2124
2125         return -1;
2126 }
2127
2128 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2129 {
2130         char *url;
2131         struct buffer buffer;
2132         struct active_request_slot *slot;
2133         struct slot_results results;
2134
2135         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2136         sprintf(url, "%s%s", remote->url, path);
2137
2138         buffer.size = 4096;
2139         buffer.posn = 0;
2140         buffer.buffer = xmalloc(buffer.size);
2141
2142         slot = get_active_slot();
2143         slot->results = &results;
2144         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2145         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2146         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2147         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2148         if (start_active_slot(slot)) {
2149                 run_active_slot(slot);
2150                 if (results.curl_result != CURLE_OK) {
2151                         die("Couldn't get %s for remote symref\n%s",
2152                             url, curl_errorstr);
2153                 }
2154         } else {
2155                 die("Unable to start remote symref request");
2156         }
2157         free(url);
2158
2159         if (*symref != NULL)
2160                 free(*symref);
2161         *symref = NULL;
2162         hashclr(sha1);
2163
2164         if (buffer.posn == 0)
2165                 return;
2166
2167         /* If it's a symref, set the refname; otherwise try for a sha1 */
2168         if (!strncmp((char *)buffer.buffer, "ref: ", 5)) {
2169                 *symref = xmalloc(buffer.posn - 5);
2170                 strlcpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 5);
2171         } else {
2172                 get_sha1_hex(buffer.buffer, sha1);
2173         }
2174
2175         free(buffer.buffer);
2176 }
2177
2178 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2179 {
2180         struct commit *head = lookup_commit(head_sha1);
2181         struct commit *branch = lookup_commit(branch_sha1);
2182         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2183
2184         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2185 }
2186
2187 static int delete_remote_branch(char *pattern, int force)
2188 {
2189         struct ref *refs = remote_refs;
2190         struct ref *remote_ref = NULL;
2191         unsigned char head_sha1[20];
2192         char *symref = NULL;
2193         int match;
2194         int patlen = strlen(pattern);
2195         int i;
2196         struct active_request_slot *slot;
2197         struct slot_results results;
2198         char *url;
2199
2200         /* Find the remote branch(es) matching the specified branch name */
2201         for (match = 0; refs; refs = refs->next) {
2202                 char *name = refs->name;
2203                 int namelen = strlen(name);
2204                 if (namelen < patlen ||
2205                     memcmp(name + namelen - patlen, pattern, patlen))
2206                         continue;
2207                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2208                         continue;
2209                 match++;
2210                 remote_ref = refs;
2211         }
2212         if (match == 0)
2213                 return error("No remote branch matches %s", pattern);
2214         if (match != 1)
2215                 return error("More than one remote branch matches %s",
2216                              pattern);
2217
2218         /*
2219          * Remote HEAD must be a symref (not exactly foolproof; a remote
2220          * symlink to a symref will look like a symref)
2221          */
2222         fetch_symref("HEAD", &symref, head_sha1);
2223         if (!symref)
2224                 return error("Remote HEAD is not a symref");
2225
2226         /* Remote branch must not be the remote HEAD */
2227         for (i=0; symref && i<MAXDEPTH; i++) {
2228                 if (!strcmp(remote_ref->name, symref))
2229                         return error("Remote branch %s is the current HEAD",
2230                                      remote_ref->name);
2231                 fetch_symref(symref, &symref, head_sha1);
2232         }
2233
2234         /* Run extra sanity checks if delete is not forced */
2235         if (!force) {
2236                 /* Remote HEAD must resolve to a known object */
2237                 if (symref)
2238                         return error("Remote HEAD symrefs too deep");
2239                 if (is_zero_sha1(head_sha1))
2240                         return error("Unable to resolve remote HEAD");
2241                 if (!has_sha1_file(head_sha1))
2242                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2243
2244                 /* Remote branch must resolve to a known object */
2245                 if (is_zero_sha1(remote_ref->old_sha1))
2246                         return error("Unable to resolve remote branch %s",
2247                                      remote_ref->name);
2248                 if (!has_sha1_file(remote_ref->old_sha1))
2249                         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));
2250
2251                 /* Remote branch must be an ancestor of remote HEAD */
2252                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2253                         return error("The branch '%s' is not a strict subset of your current HEAD.\nIf you are sure you want to delete it, run:\n\t'git http-push -D %s %s'", remote_ref->name, remote->url, pattern);
2254                 }
2255         }
2256
2257         /* Send delete request */
2258         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2259         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2260         sprintf(url, "%s%s", remote->url, remote_ref->name);
2261         slot = get_active_slot();
2262         slot->results = &results;
2263         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2264         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2265         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2266         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2267         if (start_active_slot(slot)) {
2268                 run_active_slot(slot);
2269                 free(url);
2270                 if (results.curl_result != CURLE_OK)
2271                         return error("DELETE request failed (%d/%ld)\n",
2272                                      results.curl_result, results.http_code);
2273         } else {
2274                 free(url);
2275                 return error("Unable to start DELETE request");
2276         }
2277
2278         return 0;
2279 }
2280
2281 int main(int argc, char **argv)
2282 {
2283         struct transfer_request *request;
2284         struct transfer_request *next_request;
2285         int nr_refspec = 0;
2286         char **refspec = NULL;
2287         struct remote_lock *ref_lock = NULL;
2288         struct remote_lock *info_ref_lock = NULL;
2289         struct rev_info revs;
2290         int delete_branch = 0;
2291         int force_delete = 0;
2292         int objects_to_send;
2293         int rc = 0;
2294         int i;
2295         int new_refs;
2296         struct ref *ref;
2297
2298         setup_git_directory();
2299         setup_ident();
2300
2301         remote = xcalloc(sizeof(*remote), 1);
2302
2303         argv++;
2304         for (i = 1; i < argc; i++, argv++) {
2305                 char *arg = *argv;
2306
2307                 if (*arg == '-') {
2308                         if (!strcmp(arg, "--all")) {
2309                                 push_all = 1;
2310                                 continue;
2311                         }
2312                         if (!strcmp(arg, "--force")) {
2313                                 force_all = 1;
2314                                 continue;
2315                         }
2316                         if (!strcmp(arg, "--verbose")) {
2317                                 push_verbosely = 1;
2318                                 continue;
2319                         }
2320                         if (!strcmp(arg, "-d")) {
2321                                 delete_branch = 1;
2322                                 continue;
2323                         }
2324                         if (!strcmp(arg, "-D")) {
2325                                 delete_branch = 1;
2326                                 force_delete = 1;
2327                                 continue;
2328                         }
2329                 }
2330                 if (!remote->url) {
2331                         char *path = strstr(arg, "//");
2332                         remote->url = arg;
2333                         if (path) {
2334                                 path = strchr(path+2, '/');
2335                                 if (path)
2336                                         remote->path_len = strlen(path);
2337                         }
2338                         continue;
2339                 }
2340                 refspec = argv;
2341                 nr_refspec = argc - i;
2342                 break;
2343         }
2344
2345         if (!remote->url)
2346                 usage(http_push_usage);
2347
2348         if (delete_branch && nr_refspec != 1)
2349                 die("You must specify only one branch name when deleting a remote branch");
2350
2351         memset(remote_dir_exists, -1, 256);
2352
2353         http_init();
2354
2355         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2356         default_headers = curl_slist_append(default_headers, "Range:");
2357         default_headers = curl_slist_append(default_headers, "Destination:");
2358         default_headers = curl_slist_append(default_headers, "If:");
2359         default_headers = curl_slist_append(default_headers,
2360                                             "Pragma: no-cache");
2361
2362         /* Verify DAV compliance/lock support */
2363         if (!locking_available()) {
2364                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2365                 rc = 1;
2366                 goto cleanup;
2367         }
2368
2369         /* Check whether the remote has server info files */
2370         remote->can_update_info_refs = 0;
2371         remote->has_info_refs = remote_exists("info/refs");
2372         remote->has_info_packs = remote_exists("objects/info/packs");
2373         if (remote->has_info_refs) {
2374                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2375                 if (info_ref_lock)
2376                         remote->can_update_info_refs = 1;
2377         }
2378         if (remote->has_info_packs)
2379                 fetch_indices();
2380
2381         /* Get a list of all local and remote heads to validate refspecs */
2382         get_local_heads();
2383         fprintf(stderr, "Fetching remote heads...\n");
2384         get_dav_remote_heads();
2385
2386         /* Remove a remote branch if -d or -D was specified */
2387         if (delete_branch) {
2388                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2389                         fprintf(stderr, "Unable to delete remote branch %s\n",
2390                                 refspec[0]);
2391                 goto cleanup;
2392         }
2393
2394         /* match them up */
2395         if (!remote_tail)
2396                 remote_tail = &remote_refs;
2397         if (match_refs(local_refs, remote_refs, &remote_tail,
2398                        nr_refspec, refspec, push_all))
2399                 return -1;
2400         if (!remote_refs) {
2401                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2402                 return 0;
2403         }
2404
2405         new_refs = 0;
2406         for (ref = remote_refs; ref; ref = ref->next) {
2407                 char old_hex[60], *new_hex;
2408                 const char *commit_argv[4];
2409                 int commit_argc;
2410                 char *new_sha1_hex, *old_sha1_hex;
2411
2412                 if (!ref->peer_ref)
2413                         continue;
2414                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2415                         if (push_verbosely || 1)
2416                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2417                         continue;
2418                 }
2419
2420                 if (!force_all &&
2421                     !is_zero_sha1(ref->old_sha1) &&
2422                     !ref->force) {
2423                         if (!has_sha1_file(ref->old_sha1) ||
2424                             !ref_newer(ref->peer_ref->new_sha1,
2425                                        ref->old_sha1)) {
2426                                 /* We do not have the remote ref, or
2427                                  * we know that the remote ref is not
2428                                  * an ancestor of what we are trying to
2429                                  * push.  Either way this can be losing
2430                                  * commits at the remote end and likely
2431                                  * we were not up to date to begin with.
2432                                  */
2433                                 error("remote '%s' is not a strict "
2434                                       "subset of local ref '%s'. "
2435                                       "maybe you are not up-to-date and "
2436                                       "need to pull first?",
2437                                       ref->name,
2438                                       ref->peer_ref->name);
2439                                 rc = -2;
2440                                 continue;
2441                         }
2442                 }
2443                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2444                 if (is_zero_sha1(ref->new_sha1)) {
2445                         error("cannot happen anymore");
2446                         rc = -3;
2447                         continue;
2448                 }
2449                 new_refs++;
2450                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2451                 new_hex = sha1_to_hex(ref->new_sha1);
2452
2453                 fprintf(stderr, "updating '%s'", ref->name);
2454                 if (strcmp(ref->name, ref->peer_ref->name))
2455                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2456                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2457
2458
2459                 /* Lock remote branch ref */
2460                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2461                 if (ref_lock == NULL) {
2462                         fprintf(stderr, "Unable to lock remote branch %s\n",
2463                                 ref->name);
2464                         rc = 1;
2465                         continue;
2466                 }
2467
2468                 /* Set up revision info for this refspec */
2469                 commit_argc = 3;
2470                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2471                 old_sha1_hex = NULL;
2472                 commit_argv[1] = "--objects";
2473                 commit_argv[2] = new_sha1_hex;
2474                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2475                         old_sha1_hex = xmalloc(42);
2476                         sprintf(old_sha1_hex, "^%s",
2477                                 sha1_to_hex(ref->old_sha1));
2478                         commit_argv[3] = old_sha1_hex;
2479                         commit_argc++;
2480                 }
2481                 init_revisions(&revs, setup_git_directory());
2482                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2483                 free(new_sha1_hex);
2484                 if (old_sha1_hex) {
2485                         free(old_sha1_hex);
2486                         commit_argv[1] = NULL;
2487                 }
2488
2489                 /* Generate a list of objects that need to be pushed */
2490                 pushing = 0;
2491                 prepare_revision_walk(&revs);
2492                 mark_edges_uninteresting(revs.commits);
2493                 objects_to_send = get_delta(&revs, ref_lock);
2494                 finish_all_active_slots();
2495
2496                 /* Push missing objects to remote, this would be a
2497                    convenient time to pack them first if appropriate. */
2498                 pushing = 1;
2499                 if (objects_to_send)
2500                         fprintf(stderr, "    sending %d objects\n",
2501                                 objects_to_send);
2502 #ifdef USE_CURL_MULTI
2503                 fill_active_slots();
2504 #endif
2505                 finish_all_active_slots();
2506
2507                 /* Update the remote branch if all went well */
2508                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2509                         rc = 1;
2510                         goto unlock;
2511                 }
2512
2513         unlock:
2514                 if (!rc)
2515                         fprintf(stderr, "    done\n");
2516                 unlock_remote(ref_lock);
2517                 check_locks();
2518         }
2519
2520         /* Update remote server info if appropriate */
2521         if (remote->has_info_refs && new_refs) {
2522                 if (info_ref_lock && remote->can_update_info_refs) {
2523                         fprintf(stderr, "Updating remote server info\n");
2524                         update_remote_info_refs(info_ref_lock);
2525                 } else {
2526                         fprintf(stderr, "Unable to update server info\n");
2527                 }
2528         }
2529         if (info_ref_lock)
2530                 unlock_remote(info_ref_lock);
2531
2532  cleanup:
2533         free(remote);
2534
2535         curl_slist_free_all(no_pragma_header);
2536         curl_slist_free_all(default_headers);
2537
2538         http_cleanup();
2539
2540         request = request_queue_head;
2541         while (request != NULL) {
2542                 next_request = request->next;
2543                 release_request(request);
2544                 request = next_request;
2545         }
2546
2547         return rc;
2548 }