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 "revision.h"
  10 #include "exec_cmd.h"
  11
  12 #include <expat.h>
  13
  14 static const char http_push_usage[] =
  15 "git-http-push [--all] [--force] [--verbose] <remote> [<head>...]\n";
  16
  17 #ifndef XML_STATUS_OK
  18 enum XML_Status {
  19   XML_STATUS_OK = 1,
  20   XML_STATUS_ERROR = 0
  21 };
  22 #define XML_STATUS_OK    1
  23 #define XML_STATUS_ERROR 0
  24 #endif
  25
  26 #define PREV_BUF_SIZE 4096
  27 #define RANGE_HEADER_SIZE 30
  28
  29 /* DAV methods */
  30 #define DAV_LOCK "LOCK"
  31 #define DAV_MKCOL "MKCOL"
  32 #define DAV_MOVE "MOVE"
  33 #define DAV_PROPFIND "PROPFIND"
  34 #define DAV_PUT "PUT"
  35 #define DAV_UNLOCK "UNLOCK"
  36 #define DAV_DELETE "DELETE"
  37
  38 /* DAV lock flags */
  39 #define DAV_PROP_LOCKWR (1u << 0)
  40 #define DAV_PROP_LOCKEX (1u << 1)
  41 #define DAV_LOCK_OK (1u << 2)
  42
  43 /* DAV XML properties */
  44 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  45 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  46 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  47 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  48 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  49 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  50 #define DAV_PROPFIND_RESP ".multistatus.response"
  51 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  52 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  53
  54 /* DAV request body templates */
  55 #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>"
  56 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  57 #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>"
  58
  59 #define LOCK_TIME 600
  60 #define LOCK_REFRESH 30
  61
  62 /* bits #0-4 in revision.h */
  63
  64 #define LOCAL    (1u << 5)
  65 #define REMOTE   (1u << 6)
  66 #define FETCHING (1u << 7)
  67 #define PUSHING  (1u << 8)
  68
  69 /* We allow "recursive" symbolic refs. Only within reason, though */
  70 #define MAXDEPTH 5
  71
  72 static int pushing = 0;
  73 static int aborted = 0;
  74 static signed char remote_dir_exists[256];
  75
  76 static struct curl_slist *no_pragma_header;
  77 static struct curl_slist *default_headers;
  78
  79 static int push_verbosely = 0;
  80 static int push_all = 0;
  81 static int force_all = 0;
  82
  83 static struct object_list *objects = NULL;
  84
  85 struct repo
  86 {
  87         char *url;
  88         int path_len;
  89         int has_info_refs;
  90         int can_update_info_refs;
  91         int has_info_packs;
  92         struct packed_git *packs;
  93         struct remote_lock *locks;
  94 };
  95
  96 static struct repo *remote = NULL;
  97
  98 enum transfer_state {
  99         NEED_FETCH,
 100         RUN_FETCH_LOOSE,
 101         RUN_FETCH_PACKED,
 102         NEED_PUSH,
 103         RUN_MKCOL,
 104         RUN_PUT,
 105         RUN_MOVE,
 106         ABORTED,
 107         COMPLETE,
 108 };
 109
 110 struct transfer_request
 111 {
 112         struct object *obj;
 113         char *url;
 114         char *dest;
 115         struct remote_lock *lock;
 116         struct curl_slist *headers;
 117         struct buffer buffer;
 118         char filename[PATH_MAX];
 119         char tmpfile[PATH_MAX];
 120         int local_fileno;
 121         FILE *local_stream;
 122         enum transfer_state state;
 123         CURLcode curl_result;
 124         char errorstr[CURL_ERROR_SIZE];
 125         long http_code;
 126         unsigned char real_sha1[20];
 127         SHA_CTX c;
 128         z_stream stream;
 129         int zret;
 130         int rename;
 131         void *userData;
 132         struct active_request_slot *slot;
 133         struct transfer_request *next;
 134 };
 135
 136 static struct transfer_request *request_queue_head = NULL;
 137
 138 struct xml_ctx
 139 {
 140         char *name;
 141         int len;
 142         char *cdata;
 143         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 144         void *userData;
 145 };
 146
 147 struct remote_lock
 148 {
 149         char *url;
 150         char *owner;
 151         char *token;
 152         time_t start_time;
 153         long timeout;
 154         int refreshing;
 155         struct remote_lock *next;
 156 };
 157
 158 /* Flags that control remote_ls processing */
 159 #define PROCESS_FILES (1u << 0)
 160 #define PROCESS_DIRS  (1u << 1)
 161 #define RECURSIVE     (1u << 2)
 162
 163 /* Flags that remote_ls passes to callback functions */
 164 #define IS_DIR (1u << 0)
 165
 166 struct remote_ls_ctx
 167 {
 168         char *path;
 169         void (*userFunc)(struct remote_ls_ctx *ls);
 170         void *userData;
 171         int flags;
 172         char *dentry_name;
 173         int dentry_flags;
 174         struct remote_ls_ctx *parent;
 175 };
 176
 177 static void finish_request(struct transfer_request *request);
 178 static void release_request(struct transfer_request *request);
 179
 180 static void process_response(void *callback_data)
 181 {
 182         struct transfer_request *request =
 183                 (struct transfer_request *)callback_data;
 184
 185         finish_request(request);
 186 }
 187
 188 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 189                                void *data)
 190 {
 191         unsigned char expn[4096];
 192         size_t size = eltsize * nmemb;
 193         int posn = 0;
 194         struct transfer_request *request = (struct transfer_request *)data;
 195         do {
 196                 ssize_t retval = write(request->local_fileno,
 197                                        ptr + posn, size - posn);
 198                 if (retval < 0)
 199                         return posn;
 200                 posn += retval;
 201         } while (posn < size);
 202
 203         request->stream.avail_in = size;
 204         request->stream.next_in = ptr;
 205         do {
 206                 request->stream.next_out = expn;
 207                 request->stream.avail_out = sizeof(expn);
 208                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 209                 SHA1_Update(&request->c, expn,
 210                             sizeof(expn) - request->stream.avail_out);
 211         } while (request->stream.avail_in && request->zret == Z_OK);
 212         data_received++;
 213         return size;
 214 }
 215
 216 static void start_fetch_loose(struct transfer_request *request)
 217 {
 218         char *hex = sha1_to_hex(request->obj->sha1);
 219         char *filename;
 220         char prevfile[PATH_MAX];
 221         char *url;
 222         char *posn;
 223         int prevlocal;
 224         unsigned char prev_buf[PREV_BUF_SIZE];
 225         ssize_t prev_read = 0;
 226         long prev_posn = 0;
 227         char range[RANGE_HEADER_SIZE];
 228         struct curl_slist *range_header = NULL;
 229         struct active_request_slot *slot;
 230
 231         filename = sha1_file_name(request->obj->sha1);
 232         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 233         snprintf(request->tmpfile, sizeof(request->tmpfile),
 234                  "%s.temp", filename);
 235
 236         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 237         unlink(prevfile);
 238         rename(request->tmpfile, prevfile);
 239         unlink(request->tmpfile);
 240
 241         if (request->local_fileno != -1)
 242                 error("fd leakage in start: %d", request->local_fileno);
 243         request->local_fileno = open(request->tmpfile,
 244                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 245         /* This could have failed due to the "lazy directory creation";
 246          * try to mkdir the last path component.
 247          */
 248         if (request->local_fileno < 0 && errno == ENOENT) {
 249                 char *dir = strrchr(request->tmpfile, '/');
 250                 if (dir) {
 251                         *dir = 0;
 252                         mkdir(request->tmpfile, 0777);
 253                         *dir = '/';
 254                 }
 255                 request->local_fileno = open(request->tmpfile,
 256                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 257         }
 258
 259         if (request->local_fileno < 0) {
 260                 request->state = ABORTED;
 261                 error("Couldn't create temporary file %s for %s: %s",
 262                       request->tmpfile, request->filename, strerror(errno));
 263                 return;
 264         }
 265
 266         memset(&request->stream, 0, sizeof(request->stream));
 267
 268         inflateInit(&request->stream);
 269
 270         SHA1_Init(&request->c);
 271
 272         url = xmalloc(strlen(remote->url) + 50);
 273         request->url = xmalloc(strlen(remote->url) + 50);
 274         strcpy(url, remote->url);
 275         posn = url + strlen(remote->url);
 276         strcpy(posn, "objects/");
 277         posn += 8;
 278         memcpy(posn, hex, 2);
 279         posn += 2;
 280         *(posn++) = '/';
 281         strcpy(posn, hex + 2);
 282         strcpy(request->url, url);
 283
 284         /* If a previous temp file is present, process what was already
 285            fetched. */
 286         prevlocal = open(prevfile, O_RDONLY);
 287         if (prevlocal != -1) {
 288                 do {
 289                         prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
 290                         if (prev_read>0) {
 291                                 if (fwrite_sha1_file(prev_buf,
 292                                                      1,
 293                                                      prev_read,
 294                                                      request) == prev_read) {
 295                                         prev_posn += prev_read;
 296                                 } else {
 297                                         prev_read = -1;
 298                                 }
 299                         }
 300                 } while (prev_read > 0);
 301                 close(prevlocal);
 302         }
 303         unlink(prevfile);
 304
 305         /* Reset inflate/SHA1 if there was an error reading the previous temp
 306            file; also rewind to the beginning of the local file. */
 307         if (prev_read == -1) {
 308                 memset(&request->stream, 0, sizeof(request->stream));
 309                 inflateInit(&request->stream);
 310                 SHA1_Init(&request->c);
 311                 if (prev_posn>0) {
 312                         prev_posn = 0;
 313                         lseek(request->local_fileno, SEEK_SET, 0);
 314                         ftruncate(request->local_fileno, 0);
 315                 }
 316         }
 317
 318         slot = get_active_slot();
 319         slot->callback_func = process_response;
 320         slot->callback_data = request;
 321         request->slot = slot;
 322
 323         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 324         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 325         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 326         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 327         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 328
 329         /* If we have successfully processed data from a previous fetch
 330            attempt, only fetch the data we don't already have. */
 331         if (prev_posn>0) {
 332                 if (push_verbosely)
 333                         fprintf(stderr,
 334                                 "Resuming fetch of object %s at byte %ld\n",
 335                                 hex, prev_posn);
 336                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 337                 range_header = curl_slist_append(range_header, range);
 338                 curl_easy_setopt(slot->curl,
 339                                  CURLOPT_HTTPHEADER, range_header);
 340         }
 341
 342         /* Try to get the request started, abort the request on error */
 343         request->state = RUN_FETCH_LOOSE;
 344         if (!start_active_slot(slot)) {
 345                 fprintf(stderr, "Unable to start GET request\n");
 346                 remote->can_update_info_refs = 0;
 347                 release_request(request);
 348         }
 349 }
 350
 351 static void start_fetch_packed(struct transfer_request *request)
 352 {
 353         char *url;
 354         struct packed_git *target;
 355         FILE *packfile;
 356         char *filename;
 357         long prev_posn = 0;
 358         char range[RANGE_HEADER_SIZE];
 359         struct curl_slist *range_header = NULL;
 360
 361         struct transfer_request *check_request = request_queue_head;
 362         struct active_request_slot *slot;
 363
 364         target = find_sha1_pack(request->obj->sha1, remote->packs);
 365         if (!target) {
 366                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 367                 remote->can_update_info_refs = 0;
 368                 release_request(request);
 369                 return;
 370         }
 371
 372         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 373         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 374
 375         filename = sha1_pack_name(target->sha1);
 376         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 377         snprintf(request->tmpfile, sizeof(request->tmpfile),
 378                  "%s.temp", filename);
 379
 380         url = xmalloc(strlen(remote->url) + 64);
 381         sprintf(url, "%sobjects/pack/pack-%s.pack",
 382                 remote->url, sha1_to_hex(target->sha1));
 383
 384         /* Make sure there isn't another open request for this pack */
 385         while (check_request) {
 386                 if (check_request->state == RUN_FETCH_PACKED &&
 387                     !strcmp(check_request->url, url)) {
 388                         free(url);
 389                         release_request(request);
 390                         return;
 391                 }
 392                 check_request = check_request->next;
 393         }
 394
 395         packfile = fopen(request->tmpfile, "a");
 396         if (!packfile) {
 397                 fprintf(stderr, "Unable to open local file %s for pack",
 398                         filename);
 399                 remote->can_update_info_refs = 0;
 400                 free(url);
 401                 return;
 402         }
 403
 404         slot = get_active_slot();
 405         slot->callback_func = process_response;
 406         slot->callback_data = request;
 407         request->slot = slot;
 408         request->local_stream = packfile;
 409         request->userData = target;
 410
 411         request->url = url;
 412         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 413         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 414         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 415         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 416         slot->local = packfile;
 417
 418         /* If there is data present from a previous transfer attempt,
 419            resume where it left off */
 420         prev_posn = ftell(packfile);
 421         if (prev_posn>0) {
 422                 if (push_verbosely)
 423                         fprintf(stderr,
 424                                 "Resuming fetch of pack %s at byte %ld\n",
 425                                 sha1_to_hex(target->sha1), prev_posn);
 426                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 427                 range_header = curl_slist_append(range_header, range);
 428                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 429         }
 430
 431         /* Try to get the request started, abort the request on error */
 432         request->state = RUN_FETCH_PACKED;
 433         if (!start_active_slot(slot)) {
 434                 fprintf(stderr, "Unable to start GET request\n");
 435                 remote->can_update_info_refs = 0;
 436                 release_request(request);
 437         }
 438 }
 439
 440 static void start_mkcol(struct transfer_request *request)
 441 {
 442         char *hex = sha1_to_hex(request->obj->sha1);
 443         struct active_request_slot *slot;
 444         char *posn;
 445
 446         request->url = xmalloc(strlen(remote->url) + 13);
 447         strcpy(request->url, remote->url);
 448         posn = request->url + strlen(remote->url);
 449         strcpy(posn, "objects/");
 450         posn += 8;
 451         memcpy(posn, hex, 2);
 452         posn += 2;
 453         strcpy(posn, "/");
 454
 455         slot = get_active_slot();
 456         slot->callback_func = process_response;
 457         slot->callback_data = request;
 458         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 459         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 460         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 461         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 462         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 463
 464         if (start_active_slot(slot)) {
 465                 request->slot = slot;
 466                 request->state = RUN_MKCOL;
 467         } else {
 468                 request->state = ABORTED;
 469                 free(request->url);
 470                 request->url = NULL;
 471         }
 472 }
 473
 474 static void start_put(struct transfer_request *request)
 475 {
 476         char *hex = sha1_to_hex(request->obj->sha1);
 477         struct active_request_slot *slot;
 478         char *posn;
 479         char type[20];
 480         char hdr[50];
 481         void *unpacked;
 482         unsigned long len;
 483         int hdrlen;
 484         ssize_t size;
 485         z_stream stream;
 486
 487         unpacked = read_sha1_file(request->obj->sha1, type, &len);
 488         hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
 489
 490         /* Set it up */
 491         memset(&stream, 0, sizeof(stream));
 492         deflateInit(&stream, Z_BEST_COMPRESSION);
 493         size = deflateBound(&stream, len + hdrlen);
 494         request->buffer.buffer = xmalloc(size);
 495
 496         /* Compress it */
 497         stream.next_out = request->buffer.buffer;
 498         stream.avail_out = size;
 499
 500         /* First header.. */
 501         stream.next_in = (void *)hdr;
 502         stream.avail_in = hdrlen;
 503         while (deflate(&stream, 0) == Z_OK)
 504                 /* nothing */;
 505
 506         /* Then the data itself.. */
 507         stream.next_in = unpacked;
 508         stream.avail_in = len;
 509         while (deflate(&stream, Z_FINISH) == Z_OK)
 510                 /* nothing */;
 511         deflateEnd(&stream);
 512         free(unpacked);
 513
 514         request->buffer.size = stream.total_out;
 515         request->buffer.posn = 0;
 516
 517         request->url = xmalloc(strlen(remote->url) +
 518                                strlen(request->lock->token) + 51);
 519         strcpy(request->url, remote->url);
 520         posn = request->url + strlen(remote->url);
 521         strcpy(posn, "objects/");
 522         posn += 8;
 523         memcpy(posn, hex, 2);
 524         posn += 2;
 525         *(posn++) = '/';
 526         strcpy(posn, hex + 2);
 527         request->dest = xmalloc(strlen(request->url) + 14);
 528         sprintf(request->dest, "Destination: %s", request->url);
 529         posn += 38;
 530         *(posn++) = '.';
 531         strcpy(posn, request->lock->token);
 532
 533         slot = get_active_slot();
 534         slot->callback_func = process_response;
 535         slot->callback_data = request;
 536         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 537         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.size);
 538         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 539         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 540         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 541         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 542         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 543         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 544         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 545
 546         if (start_active_slot(slot)) {
 547                 request->slot = slot;
 548                 request->state = RUN_PUT;
 549         } else {
 550                 request->state = ABORTED;
 551                 free(request->url);
 552                 request->url = NULL;
 553         }
 554 }
 555
 556 static void start_move(struct transfer_request *request)
 557 {
 558         struct active_request_slot *slot;
 559         struct curl_slist *dav_headers = NULL;
 560
 561         slot = get_active_slot();
 562         slot->callback_func = process_response;
 563         slot->callback_data = request;
 564         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 565         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 566         dav_headers = curl_slist_append(dav_headers, request->dest);
 567         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 568         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 569         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 570         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 571
 572         if (start_active_slot(slot)) {
 573                 request->slot = slot;
 574                 request->state = RUN_MOVE;
 575         } else {
 576                 request->state = ABORTED;
 577                 free(request->url);
 578                 request->url = NULL;
 579         }
 580 }
 581
 582 static int refresh_lock(struct remote_lock *lock)
 583 {
 584         struct active_request_slot *slot;
 585         struct slot_results results;
 586         char *if_header;
 587         char timeout_header[25];
 588         struct curl_slist *dav_headers = NULL;
 589         int rc = 0;
 590
 591         lock->refreshing = 1;
 592
 593         if_header = xmalloc(strlen(lock->token) + 25);
 594         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
 595         sprintf(timeout_header, "Timeout: Second-%ld", lock->timeout);
 596         dav_headers = curl_slist_append(dav_headers, if_header);
 597         dav_headers = curl_slist_append(dav_headers, timeout_header);
 598
 599         slot = get_active_slot();
 600         slot->results = &results;
 601         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 602         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 603         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 604         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 605         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 606
 607         if (start_active_slot(slot)) {
 608                 run_active_slot(slot);
 609                 if (results.curl_result != CURLE_OK) {
 610                         fprintf(stderr, "LOCK HTTP error %ld\n",
 611                                 results.http_code);
 612                 } else {
 613                         lock->start_time = time(NULL);
 614                         rc = 1;
 615                 }
 616         }
 617
 618         lock->refreshing = 0;
 619         curl_slist_free_all(dav_headers);
 620         free(if_header);
 621
 622         return rc;
 623 }
 624
 625 static void check_locks()
 626 {
 627         struct remote_lock *lock = remote->locks;
 628         time_t current_time = time(NULL);
 629         int time_remaining;
 630
 631         while (lock) {
 632                 time_remaining = lock->start_time + lock->timeout -
 633                         current_time;
 634                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 635                         if (!refresh_lock(lock)) {
 636                                 fprintf(stderr,
 637                                         "Unable to refresh lock for %s\n",
 638                                         lock->url);
 639                                 aborted = 1;
 640                                 return;
 641                         }
 642                 }
 643                 lock = lock->next;
 644         }
 645 }
 646
 647 static void release_request(struct transfer_request *request)
 648 {
 649         struct transfer_request *entry = request_queue_head;
 650
 651         if (request == request_queue_head) {
 652                 request_queue_head = request->next;
 653         } else {
 654                 while (entry->next != NULL && entry->next != request)
 655                         entry = entry->next;
 656                 if (entry->next == request)
 657                         entry->next = entry->next->next;
 658         }
 659
 660         if (request->local_fileno != -1)
 661                 close(request->local_fileno);
 662         if (request->local_stream)
 663                 fclose(request->local_stream);
 664         if (request->url != NULL)
 665                 free(request->url);
 666         free(request);
 667 }
 668
 669 static void finish_request(struct transfer_request *request)
 670 {
 671         struct stat st;
 672         struct packed_git *target;
 673         struct packed_git **lst;
 674
 675         request->curl_result = request->slot->curl_result;
 676         request->http_code = request->slot->http_code;
 677         request->slot = NULL;
 678
 679         /* Keep locks active */
 680         check_locks();
 681
 682         if (request->headers != NULL)
 683                 curl_slist_free_all(request->headers);
 684
 685         /* URL is reused for MOVE after PUT */
 686         if (request->state != RUN_PUT) {
 687                 free(request->url);
 688                 request->url = NULL;
 689         }
 690
 691         if (request->state == RUN_MKCOL) {
 692                 if (request->curl_result == CURLE_OK ||
 693                     request->http_code == 405) {
 694                         remote_dir_exists[request->obj->sha1[0]] = 1;
 695                         start_put(request);
 696                 } else {
 697                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 698                                 sha1_to_hex(request->obj->sha1),
 699                                 request->curl_result, request->http_code);
 700                         request->state = ABORTED;
 701                         aborted = 1;
 702                 }
 703         } else if (request->state == RUN_PUT) {
 704                 if (request->curl_result == CURLE_OK) {
 705                         start_move(request);
 706                 } else {
 707                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 708                                 sha1_to_hex(request->obj->sha1),
 709                                 request->curl_result, request->http_code);
 710                         request->state = ABORTED;
 711                         aborted = 1;
 712                 }
 713         } else if (request->state == RUN_MOVE) {
 714                 if (request->curl_result == CURLE_OK) {
 715                         if (push_verbosely)
 716                                 fprintf(stderr, "    sent %s\n",
 717                                         sha1_to_hex(request->obj->sha1));
 718                         request->obj->flags |= REMOTE;
 719                         release_request(request);
 720                 } else {
 721                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 722                                 sha1_to_hex(request->obj->sha1),
 723                                 request->curl_result, request->http_code);
 724                         request->state = ABORTED;
 725                         aborted = 1;
 726                 }
 727         } else if (request->state == RUN_FETCH_LOOSE) {
 728                 fchmod(request->local_fileno, 0444);
 729                 close(request->local_fileno); request->local_fileno = -1;
 730
 731                 if (request->curl_result != CURLE_OK &&
 732                     request->http_code != 416) {
 733                         if (stat(request->tmpfile, &st) == 0) {
 734                                 if (st.st_size == 0)
 735                                         unlink(request->tmpfile);
 736                         }
 737                 } else {
 738                         if (request->http_code == 416)
 739                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 740
 741                         inflateEnd(&request->stream);
 742                         SHA1_Final(request->real_sha1, &request->c);
 743                         if (request->zret != Z_STREAM_END) {
 744                                 unlink(request->tmpfile);
 745                         } else if (memcmp(request->obj->sha1, request->real_sha1, 20)) {
 746                                 unlink(request->tmpfile);
 747                         } else {
 748                                 request->rename =
 749                                         move_temp_to_file(
 750                                                 request->tmpfile,
 751                                                 request->filename);
 752                                 if (request->rename == 0) {
 753                                         request->obj->flags |= (LOCAL | REMOTE);
 754                                 }
 755                         }
 756                 }
 757
 758                 /* Try fetching packed if necessary */
 759                 if (request->obj->flags & LOCAL)
 760                         release_request(request);
 761                 else
 762                         start_fetch_packed(request);
 763
 764         } else if (request->state == RUN_FETCH_PACKED) {
 765                 if (request->curl_result != CURLE_OK) {
 766                         fprintf(stderr, "Unable to get pack file %s\n%s",
 767                                 request->url, curl_errorstr);
 768                         remote->can_update_info_refs = 0;
 769                 } else {
 770                         fclose(request->local_stream);
 771                         request->local_stream = NULL;
 772                         if (!move_temp_to_file(request->tmpfile,
 773                                                request->filename)) {
 774                                 target = (struct packed_git *)request->userData;
 775                                 lst = &remote->packs;
 776                                 while (*lst != target)
 777                                         lst = &((*lst)->next);
 778                                 *lst = (*lst)->next;
 779
 780                                 if (!verify_pack(target, 0))
 781                                         install_packed_git(target);
 782                                 else
 783                                         remote->can_update_info_refs = 0;
 784                         }
 785                 }
 786                 release_request(request);
 787         }
 788 }
 789
 790 void fill_active_slots(void)
 791 {
 792         struct transfer_request *request = request_queue_head;
 793         struct transfer_request *next;
 794         struct active_request_slot *slot = active_queue_head;
 795         int num_transfers;
 796
 797         if (aborted)
 798                 return;
 799
 800         while (active_requests < max_requests && request != NULL) {
 801                 next = request->next;
 802                 if (request->state == NEED_FETCH) {
 803                         start_fetch_loose(request);
 804                 } else if (pushing && request->state == NEED_PUSH) {
 805                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 806                                 start_put(request);
 807                         } else {
 808                                 start_mkcol(request);
 809                         }
 810                         curl_multi_perform(curlm, &num_transfers);
 811                 }
 812                 request = next;
 813         }
 814
 815         while (slot != NULL) {
 816                 if (!slot->in_use && slot->curl != NULL) {
 817                         curl_easy_cleanup(slot->curl);
 818                         slot->curl = NULL;
 819                 }
 820                 slot = slot->next;
 821         }
 822 }
 823
 824 static void get_remote_object_list(unsigned char parent);
 825
 826 static void add_fetch_request(struct object *obj)
 827 {
 828         struct transfer_request *request;
 829
 830         check_locks();
 831
 832         /*
 833          * Don't fetch the object if it's known to exist locally
 834          * or is already in the request queue
 835          */
 836         if (remote_dir_exists[obj->sha1[0]] == -1)
 837                 get_remote_object_list(obj->sha1[0]);
 838         if (obj->flags & (LOCAL | FETCHING))
 839                 return;
 840
 841         obj->flags |= FETCHING;
 842         request = xmalloc(sizeof(*request));
 843         request->obj = obj;
 844         request->url = NULL;
 845         request->lock = NULL;
 846         request->headers = NULL;
 847         request->local_fileno = -1;
 848         request->local_stream = NULL;
 849         request->state = NEED_FETCH;
 850         request->next = request_queue_head;
 851         request_queue_head = request;
 852
 853         fill_active_slots();
 854         step_active_slots();
 855 }
 856
 857 static int add_send_request(struct object *obj, struct remote_lock *lock)
 858 {
 859         struct transfer_request *request = request_queue_head;
 860         struct packed_git *target;
 861
 862         /* Keep locks active */
 863         check_locks();
 864
 865         /*
 866          * Don't push the object if it's known to exist on the remote
 867          * or is already in the request queue
 868          */
 869         if (remote_dir_exists[obj->sha1[0]] == -1)
 870                 get_remote_object_list(obj->sha1[0]);
 871         if (obj->flags & (REMOTE | PUSHING))
 872                 return 0;
 873         target = find_sha1_pack(obj->sha1, remote->packs);
 874         if (target) {
 875                 obj->flags |= REMOTE;
 876                 return 0;
 877         }
 878
 879         obj->flags |= PUSHING;
 880         request = xmalloc(sizeof(*request));
 881         request->obj = obj;
 882         request->url = NULL;
 883         request->lock = lock;
 884         request->headers = NULL;
 885         request->local_fileno = -1;
 886         request->local_stream = NULL;
 887         request->state = NEED_PUSH;
 888         request->next = request_queue_head;
 889         request_queue_head = request;
 890
 891         fill_active_slots();
 892         step_active_slots();
 893
 894         return 1;
 895 }
 896
 897 static int fetch_index(unsigned char *sha1)
 898 {
 899         char *hex = sha1_to_hex(sha1);
 900         char *filename;
 901         char *url;
 902         char tmpfile[PATH_MAX];
 903         long prev_posn = 0;
 904         char range[RANGE_HEADER_SIZE];
 905         struct curl_slist *range_header = NULL;
 906
 907         FILE *indexfile;
 908         struct active_request_slot *slot;
 909         struct slot_results results;
 910
 911         /* Don't use the index if the pack isn't there */
 912         url = xmalloc(strlen(remote->url) + 64);
 913         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 914         slot = get_active_slot();
 915         slot->results = &results;
 916         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 917         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 918         if (start_active_slot(slot)) {
 919                 run_active_slot(slot);
 920                 if (results.curl_result != CURLE_OK) {
 921                         free(url);
 922                         return error("Unable to verify pack %s is available",
 923                                      hex);
 924                 }
 925         } else {
 926                 return error("Unable to start request");
 927         }
 928
 929         if (has_pack_index(sha1))
 930                 return 0;
 931
 932         if (push_verbosely)
 933                 fprintf(stderr, "Getting index for pack %s\n", hex);
 934
 935         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 936
 937         filename = sha1_pack_index_name(sha1);
 938         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 939         indexfile = fopen(tmpfile, "a");
 940         if (!indexfile)
 941                 return error("Unable to open local file %s for pack index",
 942                              filename);
 943
 944         slot = get_active_slot();
 945         slot->results = &results;
 946         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 947         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 948         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 949         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 950         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 951         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 952         slot->local = indexfile;
 953
 954         /* If there is data present from a previous transfer attempt,
 955            resume where it left off */
 956         prev_posn = ftell(indexfile);
 957         if (prev_posn>0) {
 958                 if (push_verbosely)
 959                         fprintf(stderr,
 960                                 "Resuming fetch of index for pack %s at byte %ld\n",
 961                                 hex, prev_posn);
 962                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 963                 range_header = curl_slist_append(range_header, range);
 964                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 965         }
 966
 967         if (start_active_slot(slot)) {
 968                 run_active_slot(slot);
 969                 if (results.curl_result != CURLE_OK) {
 970                         free(url);
 971                         fclose(indexfile);
 972                         return error("Unable to get pack index %s\n%s", url,
 973                                      curl_errorstr);
 974                 }
 975         } else {
 976                 free(url);
 977                 fclose(indexfile);
 978                 return error("Unable to start request");
 979         }
 980
 981         free(url);
 982         fclose(indexfile);
 983
 984         return move_temp_to_file(tmpfile, filename);
 985 }
 986
 987 static int setup_index(unsigned char *sha1)
 988 {
 989         struct packed_git *new_pack;
 990
 991         if (fetch_index(sha1))
 992                 return -1;
 993
 994         new_pack = parse_pack_index(sha1);
 995         new_pack->next = remote->packs;
 996         remote->packs = new_pack;
 997         return 0;
 998 }
 999
1000 static int fetch_indices(void)
1001 {
1002         unsigned char sha1[20];
1003         char *url;
1004         struct buffer buffer;
1005         char *data;
1006         int i = 0;
1007
1008         struct active_request_slot *slot;
1009         struct slot_results results;
1010
1011         data = xmalloc(4096);
1012         memset(data, 0, 4096);
1013         buffer.size = 4096;
1014         buffer.posn = 0;
1015         buffer.buffer = data;
1016
1017         if (push_verbosely)
1018                 fprintf(stderr, "Getting pack list\n");
1019
1020         url = xmalloc(strlen(remote->url) + 20);
1021         sprintf(url, "%sobjects/info/packs", remote->url);
1022
1023         slot = get_active_slot();
1024         slot->results = &results;
1025         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1026         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1027         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1028         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1029         if (start_active_slot(slot)) {
1030                 run_active_slot(slot);
1031                 if (results.curl_result != CURLE_OK) {
1032                         free(buffer.buffer);
1033                         free(url);
1034                         if (results.http_code == 404)
1035                                 return 0;
1036                         else
1037                                 return error("%s", curl_errorstr);
1038                 }
1039         } else {
1040                 free(buffer.buffer);
1041                 free(url);
1042                 return error("Unable to start request");
1043         }
1044         free(url);
1045
1046         data = buffer.buffer;
1047         while (i < buffer.posn) {
1048                 switch (data[i]) {
1049                 case 'P':
1050                         i++;
1051                         if (i + 52 < buffer.posn &&
1052                             !strncmp(data + i, " pack-", 6) &&
1053                             !strncmp(data + i + 46, ".pack\n", 6)) {
1054                                 get_sha1_hex(data + i + 6, sha1);
1055                                 setup_index(sha1);
1056                                 i += 51;
1057                                 break;
1058                         }
1059                 default:
1060                         while (data[i] != '\n')
1061                                 i++;
1062                 }
1063                 i++;
1064         }
1065
1066         free(buffer.buffer);
1067         return 0;
1068 }
1069
1070 static inline int needs_quote(int ch)
1071 {
1072         switch (ch) {
1073         case '/': case '-': case '.':
1074         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1075                 return 0;
1076         default:
1077                 return 1;
1078         }
1079 }
1080
1081 static inline int hex(int v)
1082 {
1083         if (v < 10) return '0' + v;
1084         else return 'A' + v - 10;
1085 }
1086
1087 static char *quote_ref_url(const char *base, const char *ref)
1088 {
1089         const char *cp;
1090         char *dp, *qref;
1091         int len, baselen, ch;
1092
1093         baselen = strlen(base);
1094         len = baselen + 1;
1095         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1096                 if (needs_quote(ch))
1097                         len += 2; /* extra two hex plus replacement % */
1098         qref = xmalloc(len);
1099         memcpy(qref, base, baselen);
1100         for (cp = ref, dp = qref + baselen; (ch = *cp) != 0; cp++) {
1101                 if (needs_quote(ch)) {
1102                         *dp++ = '%';
1103                         *dp++ = hex((ch >> 4) & 0xF);
1104                         *dp++ = hex(ch & 0xF);
1105                 }
1106                 else
1107                         *dp++ = ch;
1108         }
1109         *dp = 0;
1110
1111         return qref;
1112 }
1113
1114 int fetch_ref(char *ref, unsigned char *sha1)
1115 {
1116         char *url;
1117         char hex[42];
1118         struct buffer buffer;
1119         char *base = remote->url;
1120         struct active_request_slot *slot;
1121         struct slot_results results;
1122         buffer.size = 41;
1123         buffer.posn = 0;
1124         buffer.buffer = hex;
1125         hex[41] = '\0';
1126
1127         url = quote_ref_url(base, ref);
1128         slot = get_active_slot();
1129         slot->results = &results;
1130         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1131         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1132         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1133         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1134         if (start_active_slot(slot)) {
1135                 run_active_slot(slot);
1136                 if (results.curl_result != CURLE_OK)
1137                         return error("Couldn't get %s for %s\n%s",
1138                                      url, ref, curl_errorstr);
1139         } else {
1140                 return error("Unable to start request");
1141         }
1142
1143         hex[40] = '\0';
1144         get_sha1_hex(hex, sha1);
1145         return 0;
1146 }
1147
1148 static void one_remote_object(const char *hex)
1149 {
1150         unsigned char sha1[20];
1151         struct object *obj;
1152
1153         if (get_sha1_hex(hex, sha1) != 0)
1154                 return;
1155
1156         obj = lookup_object(sha1);
1157         if (!obj)
1158                 obj = parse_object(sha1);
1159
1160         /* Ignore remote objects that don't exist locally */
1161         if (!obj)
1162                 return;
1163
1164         obj->flags |= REMOTE;
1165         if (!object_list_contains(objects, obj))
1166                 add_object(obj, &objects, NULL, "");
1167 }
1168
1169 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1170 {
1171         int *lock_flags = (int *)ctx->userData;
1172
1173         if (tag_closed) {
1174                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1175                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1176                             (*lock_flags & DAV_PROP_LOCKWR)) {
1177                                 *lock_flags |= DAV_LOCK_OK;
1178                         }
1179                         *lock_flags &= DAV_LOCK_OK;
1180                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1181                         *lock_flags |= DAV_PROP_LOCKWR;
1182                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1183                         *lock_flags |= DAV_PROP_LOCKEX;
1184                 }
1185         }
1186 }
1187
1188 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1189 {
1190         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1191
1192         if (tag_closed && ctx->cdata) {
1193                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1194                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1195                         strcpy(lock->owner, ctx->cdata);
1196                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1197                         if (!strncmp(ctx->cdata, "Second-", 7))
1198                                 lock->timeout =
1199                                         strtol(ctx->cdata + 7, NULL, 10);
1200                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1201                         if (!strncmp(ctx->cdata, "opaquelocktoken:", 16)) {
1202                                 lock->token = xmalloc(strlen(ctx->cdata) - 15);
1203                                 strcpy(lock->token, ctx->cdata + 16);
1204                         }
1205                 }
1206         }
1207 }
1208
1209 static void one_remote_ref(char *refname);
1210
1211 static void
1212 xml_start_tag(void *userData, const char *name, const char **atts)
1213 {
1214         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1215         const char *c = index(name, ':');
1216         int new_len;
1217
1218         if (c == NULL)
1219                 c = name;
1220         else
1221                 c++;
1222
1223         new_len = strlen(ctx->name) + strlen(c) + 2;
1224
1225         if (new_len > ctx->len) {
1226                 ctx->name = xrealloc(ctx->name, new_len);
1227                 ctx->len = new_len;
1228         }
1229         strcat(ctx->name, ".");
1230         strcat(ctx->name, c);
1231
1232         if (ctx->cdata) {
1233                 free(ctx->cdata);
1234                 ctx->cdata = NULL;
1235         }
1236
1237         ctx->userFunc(ctx, 0);
1238 }
1239
1240 static void
1241 xml_end_tag(void *userData, const char *name)
1242 {
1243         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1244         const char *c = index(name, ':');
1245         char *ep;
1246
1247         ctx->userFunc(ctx, 1);
1248
1249         if (c == NULL)
1250                 c = name;
1251         else
1252                 c++;
1253
1254         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1255         *ep = 0;
1256 }
1257
1258 static void
1259 xml_cdata(void *userData, const XML_Char *s, int len)
1260 {
1261         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1262         if (ctx->cdata)
1263                 free(ctx->cdata);
1264         ctx->cdata = xcalloc(len+1, 1);
1265         strncpy(ctx->cdata, s, len);
1266 }
1267
1268 static struct remote_lock *lock_remote(char *path, long timeout)
1269 {
1270         struct active_request_slot *slot;
1271         struct slot_results results;
1272         struct buffer out_buffer;
1273         struct buffer in_buffer;
1274         char *out_data;
1275         char *in_data;
1276         char *url;
1277         char *ep;
1278         char timeout_header[25];
1279         struct remote_lock *lock = NULL;
1280         XML_Parser parser = XML_ParserCreate(NULL);
1281         enum XML_Status result;
1282         struct curl_slist *dav_headers = NULL;
1283         struct xml_ctx ctx;
1284
1285         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1286         sprintf(url, "%s%s", remote->url, path);
1287
1288         /* Make sure leading directories exist for the remote ref */
1289         ep = strchr(url + strlen(remote->url) + 11, '/');
1290         while (ep) {
1291                 *ep = 0;
1292                 slot = get_active_slot();
1293                 slot->results = &results;
1294                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1295                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1296                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1297                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1298                 if (start_active_slot(slot)) {
1299                         run_active_slot(slot);
1300                         if (results.curl_result != CURLE_OK &&
1301                             results.http_code != 405) {
1302                                 fprintf(stderr,
1303                                         "Unable to create branch path %s\n",
1304                                         url);
1305                                 free(url);
1306                                 return NULL;
1307                         }
1308                 } else {
1309                         fprintf(stderr, "Unable to start MKCOL request\n");
1310                         free(url);
1311                         return NULL;
1312                 }
1313                 *ep = '/';
1314                 ep = strchr(ep + 1, '/');
1315         }
1316
1317         out_buffer.size = strlen(LOCK_REQUEST) + strlen(git_default_email) - 2;
1318         out_data = xmalloc(out_buffer.size + 1);
1319         snprintf(out_data, out_buffer.size + 1, LOCK_REQUEST, git_default_email);
1320         out_buffer.posn = 0;
1321         out_buffer.buffer = out_data;
1322
1323         in_buffer.size = 4096;
1324         in_data = xmalloc(in_buffer.size);
1325         in_buffer.posn = 0;
1326         in_buffer.buffer = in_data;
1327
1328         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1329         dav_headers = curl_slist_append(dav_headers, timeout_header);
1330         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1331
1332         slot = get_active_slot();
1333         slot->results = &results;
1334         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1335         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1336         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1337         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1338         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1339         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1340         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1341         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1342         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1343
1344         lock = xcalloc(1, sizeof(*lock));
1345         lock->timeout = -1;
1346
1347         if (start_active_slot(slot)) {
1348                 run_active_slot(slot);
1349                 if (results.curl_result == CURLE_OK) {
1350                         ctx.name = xcalloc(10, 1);
1351                         ctx.len = 0;
1352                         ctx.cdata = NULL;
1353                         ctx.userFunc = handle_new_lock_ctx;
1354                         ctx.userData = lock;
1355                         XML_SetUserData(parser, &ctx);
1356                         XML_SetElementHandler(parser, xml_start_tag,
1357                                               xml_end_tag);
1358                         XML_SetCharacterDataHandler(parser, xml_cdata);
1359                         result = XML_Parse(parser, in_buffer.buffer,
1360                                            in_buffer.posn, 1);
1361                         free(ctx.name);
1362                         if (result != XML_STATUS_OK) {
1363                                 fprintf(stderr, "XML error: %s\n",
1364                                         XML_ErrorString(
1365                                                 XML_GetErrorCode(parser)));
1366                                 lock->timeout = -1;
1367                         }
1368                 }
1369         } else {
1370                 fprintf(stderr, "Unable to start LOCK request\n");
1371         }
1372
1373         curl_slist_free_all(dav_headers);
1374         free(out_data);
1375         free(in_data);
1376
1377         if (lock->token == NULL || lock->timeout <= 0) {
1378                 if (lock->token != NULL)
1379                         free(lock->token);
1380                 if (lock->owner != NULL)
1381                         free(lock->owner);
1382                 free(url);
1383                 free(lock);
1384                 lock = NULL;
1385         } else {
1386                 lock->url = url;
1387                 lock->start_time = time(NULL);
1388                 lock->next = remote->locks;
1389                 remote->locks = lock;
1390         }
1391
1392         return lock;
1393 }
1394
1395 static int unlock_remote(struct remote_lock *lock)
1396 {
1397         struct active_request_slot *slot;
1398         struct slot_results results;
1399         struct remote_lock *prev = remote->locks;
1400         char *lock_token_header;
1401         struct curl_slist *dav_headers = NULL;
1402         int rc = 0;
1403
1404         lock_token_header = xmalloc(strlen(lock->token) + 31);
1405         sprintf(lock_token_header, "Lock-Token: <opaquelocktoken:%s>",
1406                 lock->token);
1407         dav_headers = curl_slist_append(dav_headers, lock_token_header);
1408
1409         slot = get_active_slot();
1410         slot->results = &results;
1411         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1412         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1413         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1414         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1415
1416         if (start_active_slot(slot)) {
1417                 run_active_slot(slot);
1418                 if (results.curl_result == CURLE_OK)
1419                         rc = 1;
1420                 else
1421                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1422                                 results.http_code);
1423         } else {
1424                 fprintf(stderr, "Unable to start UNLOCK request\n");
1425         }
1426
1427         curl_slist_free_all(dav_headers);
1428         free(lock_token_header);
1429
1430         if (remote->locks == lock) {
1431                 remote->locks = lock->next;
1432         } else {
1433                 while (prev && prev->next != lock)
1434                         prev = prev->next;
1435                 if (prev)
1436                         prev->next = prev->next->next;
1437         }
1438
1439         if (lock->owner != NULL)
1440                 free(lock->owner);
1441         free(lock->url);
1442         free(lock->token);
1443         free(lock);
1444
1445         return rc;
1446 }
1447
1448 static void remote_ls(const char *path, int flags,
1449                       void (*userFunc)(struct remote_ls_ctx *ls),
1450                       void *userData);
1451
1452 static void process_ls_object(struct remote_ls_ctx *ls)
1453 {
1454         unsigned int *parent = (unsigned int *)ls->userData;
1455         char *path = ls->dentry_name;
1456         char *obj_hex;
1457
1458         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1459                 remote_dir_exists[*parent] = 1;
1460                 return;
1461         }
1462
1463         if (strlen(path) != 49)
1464                 return;
1465         path += 8;
1466         obj_hex = xmalloc(strlen(path));
1467         strncpy(obj_hex, path, 2);
1468         strcpy(obj_hex + 2, path + 3);
1469         one_remote_object(obj_hex);
1470         free(obj_hex);
1471 }
1472
1473 static void process_ls_ref(struct remote_ls_ctx *ls)
1474 {
1475         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1476                 fprintf(stderr, "  %s\n", ls->dentry_name);
1477                 return;
1478         }
1479
1480         if (!(ls->dentry_flags & IS_DIR))
1481                 one_remote_ref(ls->dentry_name);
1482 }
1483
1484 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1485 {
1486         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1487
1488         if (tag_closed) {
1489                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1490                         if (ls->dentry_flags & IS_DIR) {
1491                                 if (ls->flags & PROCESS_DIRS) {
1492                                         ls->userFunc(ls);
1493                                 }
1494                                 if (strcmp(ls->dentry_name, ls->path) &&
1495                                     ls->flags & RECURSIVE) {
1496                                         remote_ls(ls->dentry_name,
1497                                                   ls->flags,
1498                                                   ls->userFunc,
1499                                                   ls->userData);
1500                                 }
1501                         } else if (ls->flags & PROCESS_FILES) {
1502                                 ls->userFunc(ls);
1503                         }
1504                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1505                         ls->dentry_name = xmalloc(strlen(ctx->cdata) -
1506                                                   remote->path_len + 1);
1507                         strcpy(ls->dentry_name, ctx->cdata + remote->path_len);
1508                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1509                         ls->dentry_flags |= IS_DIR;
1510                 }
1511         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1512                 if (ls->dentry_name) {
1513                         free(ls->dentry_name);
1514                 }
1515                 ls->dentry_name = NULL;
1516                 ls->dentry_flags = 0;
1517         }
1518 }
1519
1520 static void remote_ls(const char *path, int flags,
1521                       void (*userFunc)(struct remote_ls_ctx *ls),
1522                       void *userData)
1523 {
1524         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1525         struct active_request_slot *slot;
1526         struct slot_results results;
1527         struct buffer in_buffer;
1528         struct buffer out_buffer;
1529         char *in_data;
1530         char *out_data;
1531         XML_Parser parser = XML_ParserCreate(NULL);
1532         enum XML_Status result;
1533         struct curl_slist *dav_headers = NULL;
1534         struct xml_ctx ctx;
1535         struct remote_ls_ctx ls;
1536
1537         ls.flags = flags;
1538         ls.path = strdup(path);
1539         ls.dentry_name = NULL;
1540         ls.dentry_flags = 0;
1541         ls.userData = userData;
1542         ls.userFunc = userFunc;
1543
1544         sprintf(url, "%s%s", remote->url, path);
1545
1546         out_buffer.size = strlen(PROPFIND_ALL_REQUEST);
1547         out_data = xmalloc(out_buffer.size + 1);
1548         snprintf(out_data, out_buffer.size + 1, PROPFIND_ALL_REQUEST);
1549         out_buffer.posn = 0;
1550         out_buffer.buffer = out_data;
1551
1552         in_buffer.size = 4096;
1553         in_data = xmalloc(in_buffer.size);
1554         in_buffer.posn = 0;
1555         in_buffer.buffer = in_data;
1556
1557         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1558         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1559
1560         slot = get_active_slot();
1561         slot->results = &results;
1562         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1563         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1564         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1565         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1566         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1567         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1568         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1569         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1570         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1571
1572         if (start_active_slot(slot)) {
1573                 run_active_slot(slot);
1574                 if (results.curl_result == CURLE_OK) {
1575                         ctx.name = xcalloc(10, 1);
1576                         ctx.len = 0;
1577                         ctx.cdata = NULL;
1578                         ctx.userFunc = handle_remote_ls_ctx;
1579                         ctx.userData = &ls;
1580                         XML_SetUserData(parser, &ctx);
1581                         XML_SetElementHandler(parser, xml_start_tag,
1582                                               xml_end_tag);
1583                         XML_SetCharacterDataHandler(parser, xml_cdata);
1584                         result = XML_Parse(parser, in_buffer.buffer,
1585                                            in_buffer.posn, 1);
1586                         free(ctx.name);
1587
1588                         if (result != XML_STATUS_OK) {
1589                                 fprintf(stderr, "XML error: %s\n",
1590                                         XML_ErrorString(
1591                                                 XML_GetErrorCode(parser)));
1592                         }
1593                 }
1594         } else {
1595                 fprintf(stderr, "Unable to start PROPFIND request\n");
1596         }
1597
1598         free(ls.path);
1599         free(url);
1600         free(out_data);
1601         free(in_buffer.buffer);
1602         curl_slist_free_all(dav_headers);
1603 }
1604
1605 static void get_remote_object_list(unsigned char parent)
1606 {
1607         char path[] = "objects/XX/";
1608         static const char hex[] = "0123456789abcdef";
1609         unsigned int val = parent;
1610
1611         path[8] = hex[val >> 4];
1612         path[9] = hex[val & 0xf];
1613         remote_dir_exists[val] = 0;
1614         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1615                   process_ls_object, &val);
1616 }
1617
1618 static int locking_available(void)
1619 {
1620         struct active_request_slot *slot;
1621         struct slot_results results;
1622         struct buffer in_buffer;
1623         struct buffer out_buffer;
1624         char *in_data;
1625         char *out_data;
1626         XML_Parser parser = XML_ParserCreate(NULL);
1627         enum XML_Status result;
1628         struct curl_slist *dav_headers = NULL;
1629         struct xml_ctx ctx;
1630         int lock_flags = 0;
1631
1632         out_buffer.size =
1633                 strlen(PROPFIND_SUPPORTEDLOCK_REQUEST) +
1634                 strlen(remote->url) - 2;
1635         out_data = xmalloc(out_buffer.size + 1);
1636         snprintf(out_data, out_buffer.size + 1,
1637                  PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1638         out_buffer.posn = 0;
1639         out_buffer.buffer = out_data;
1640
1641         in_buffer.size = 4096;
1642         in_data = xmalloc(in_buffer.size);
1643         in_buffer.posn = 0;
1644         in_buffer.buffer = in_data;
1645
1646         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1647         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1648
1649         slot = get_active_slot();
1650         slot->results = &results;
1651         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1653         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1654         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1655         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1656         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1657         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1658         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1659         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1660
1661         if (start_active_slot(slot)) {
1662                 run_active_slot(slot);
1663                 if (results.curl_result == CURLE_OK) {
1664                         ctx.name = xcalloc(10, 1);
1665                         ctx.len = 0;
1666                         ctx.cdata = NULL;
1667                         ctx.userFunc = handle_lockprop_ctx;
1668                         ctx.userData = &lock_flags;
1669                         XML_SetUserData(parser, &ctx);
1670                         XML_SetElementHandler(parser, xml_start_tag,
1671                                               xml_end_tag);
1672                         result = XML_Parse(parser, in_buffer.buffer,
1673                                            in_buffer.posn, 1);
1674                         free(ctx.name);
1675
1676                         if (result != XML_STATUS_OK) {
1677                                 fprintf(stderr, "XML error: %s\n",
1678                                         XML_ErrorString(
1679                                                 XML_GetErrorCode(parser)));
1680                                 lock_flags = 0;
1681                         }
1682                 }
1683         } else {
1684                 fprintf(stderr, "Unable to start PROPFIND request\n");
1685         }
1686
1687         free(out_data);
1688         free(in_buffer.buffer);
1689         curl_slist_free_all(dav_headers);
1690
1691         return lock_flags;
1692 }
1693
1694 static struct object_list **process_blob(struct blob *blob,
1695                                          struct object_list **p,
1696                                          struct name_path *path,
1697                                          const char *name)
1698 {
1699         struct object *obj = &blob->object;
1700
1701         obj->flags |= LOCAL;
1702
1703         if (obj->flags & (UNINTERESTING | SEEN))
1704                 return p;
1705
1706         obj->flags |= SEEN;
1707         return add_object(obj, p, path, name);
1708 }
1709
1710 static struct object_list **process_tree(struct tree *tree,
1711                                          struct object_list **p,
1712                                          struct name_path *path,
1713                                          const char *name)
1714 {
1715         struct object *obj = &tree->object;
1716         struct tree_entry_list *entry;
1717         struct name_path me;
1718
1719         obj->flags |= LOCAL;
1720
1721         if (obj->flags & (UNINTERESTING | SEEN))
1722                 return p;
1723         if (parse_tree(tree) < 0)
1724                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1725
1726         obj->flags |= SEEN;
1727         p = add_object(obj, p, NULL, name);
1728         me.up = path;
1729         me.elem = name;
1730         me.elem_len = strlen(name);
1731         entry = tree->entries;
1732         tree->entries = NULL;
1733         while (entry) {
1734                 struct tree_entry_list *next = entry->next;
1735                 if (entry->directory)
1736                         p = process_tree(entry->item.tree, p, &me, entry->name);
1737                 else
1738                         p = process_blob(entry->item.blob, p, &me, entry->name);
1739                 free(entry);
1740                 entry = next;
1741         }
1742         return p;
1743 }
1744
1745 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1746 {
1747         struct commit *commit;
1748         struct object_list **p = &objects, *pending;
1749         int count = 0;
1750
1751         while ((commit = get_revision(revs)) != NULL) {
1752                 p = process_tree(commit->tree, p, NULL, "");
1753                 commit->object.flags |= LOCAL;
1754                 if (!(commit->object.flags & UNINTERESTING))
1755                         count += add_send_request(&commit->object, lock);
1756         }
1757
1758         for (pending = revs->pending_objects; pending; pending = pending->next) {
1759                 struct object *obj = pending->item;
1760                 const char *name = pending->name;
1761
1762                 if (obj->flags & (UNINTERESTING | SEEN))
1763                         continue;
1764                 if (obj->type == tag_type) {
1765                         obj->flags |= SEEN;
1766                         p = add_object(obj, p, NULL, name);
1767                         continue;
1768                 }
1769                 if (obj->type == tree_type) {
1770                         p = process_tree((struct tree *)obj, p, NULL, name);
1771                         continue;
1772                 }
1773                 if (obj->type == blob_type) {
1774                         p = process_blob((struct blob *)obj, p, NULL, name);
1775                         continue;
1776                 }
1777                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1778         }
1779
1780         while (objects) {
1781                 if (!(objects->item->flags & UNINTERESTING))
1782                         count += add_send_request(objects->item, lock);
1783                 objects = objects->next;
1784         }
1785
1786         return count;
1787 }
1788
1789 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1790 {
1791         struct active_request_slot *slot;
1792         struct slot_results results;
1793         char *out_data;
1794         char *if_header;
1795         struct buffer out_buffer;
1796         struct curl_slist *dav_headers = NULL;
1797         int i;
1798
1799         if_header = xmalloc(strlen(lock->token) + 25);
1800         sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
1801         dav_headers = curl_slist_append(dav_headers, if_header);
1802
1803         out_buffer.size = 41;
1804         out_data = xmalloc(out_buffer.size + 1);
1805         i = snprintf(out_data, out_buffer.size + 1, "%s\n", sha1_to_hex(sha1));
1806         if (i != out_buffer.size) {
1807                 fprintf(stderr, "Unable to initialize PUT request body\n");
1808                 return 0;
1809         }
1810         out_buffer.posn = 0;
1811         out_buffer.buffer = out_data;
1812
1813         slot = get_active_slot();
1814         slot->results = &results;
1815         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1816         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.size);
1817         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1818         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1819         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1820         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1821         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1822         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1823         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1824
1825         if (start_active_slot(slot)) {
1826                 run_active_slot(slot);
1827                 free(out_data);
1828                 free(if_header);
1829                 if (results.curl_result != CURLE_OK) {
1830                         fprintf(stderr,
1831                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1832                                 results.curl_result, results.http_code);
1833                         /* We should attempt recovery? */
1834                         return 0;
1835                 }
1836         } else {
1837                 free(out_data);
1838                 free(if_header);
1839                 fprintf(stderr, "Unable to start PUT request\n");
1840                 return 0;
1841         }
1842
1843         return 1;
1844 }
1845
1846 static struct ref *local_refs, **local_tail;
1847 static struct ref *remote_refs, **remote_tail;
1848
1849 static int one_local_ref(const char *refname, const unsigned char *sha1)
1850 {
1851         struct ref *ref;
1852         int len = strlen(refname) + 1;
1853         ref = xcalloc(1, sizeof(*ref) + len);
1854         memcpy(ref->new_sha1, sha1, 20);
1855         memcpy(ref->name, refname, len);
1856         *local_tail = ref;
1857         local_tail = &ref->next;
1858         return 0;
1859 }
1860
1861 static void one_remote_ref(char *refname)
1862 {
1863         struct ref *ref;
1864         unsigned char remote_sha1[20];
1865         struct object *obj;
1866
1867         if (fetch_ref(refname, remote_sha1) != 0) {
1868                 fprintf(stderr,
1869                         "Unable to fetch ref %s from %s\n",
1870                         refname, remote->url);
1871                 return;
1872         }
1873
1874         /*
1875          * Fetch a copy of the object if it doesn't exist locally - it
1876          * may be required for updating server info later.
1877          */
1878         if (remote->can_update_info_refs && !has_sha1_file(remote_sha1)) {
1879                 obj = lookup_unknown_object(remote_sha1);
1880                 if (obj) {
1881                         fprintf(stderr, "  fetch %s for %s\n",
1882                                 sha1_to_hex(remote_sha1), refname);
1883                         add_fetch_request(obj);
1884                 }
1885         }
1886
1887         int len = strlen(refname) + 1;
1888         ref = xcalloc(1, sizeof(*ref) + len);
1889         memcpy(ref->old_sha1, remote_sha1, 20);
1890         memcpy(ref->name, refname, len);
1891         *remote_tail = ref;
1892         remote_tail = &ref->next;
1893 }
1894
1895 static void get_local_heads(void)
1896 {
1897         local_tail = &local_refs;
1898         for_each_ref(one_local_ref);
1899 }
1900
1901 static void get_dav_remote_heads(void)
1902 {
1903         remote_tail = &remote_refs;
1904         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1905 }
1906
1907 static int is_zero_sha1(const unsigned char *sha1)
1908 {
1909         int i;
1910
1911         for (i = 0; i < 20; i++) {
1912                 if (*sha1++)
1913                         return 0;
1914         }
1915         return 1;
1916 }
1917
1918 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1919 {
1920         while (list) {
1921                 struct commit_list *temp = list;
1922                 temp->item->object.flags &= ~mark;
1923                 list = temp->next;
1924                 free(temp);
1925         }
1926 }
1927
1928 static int ref_newer(const unsigned char *new_sha1,
1929                      const unsigned char *old_sha1)
1930 {
1931         struct object *o;
1932         struct commit *old, *new;
1933         struct commit_list *list, *used;
1934         int found = 0;
1935
1936         /* Both new and old must be commit-ish and new is descendant of
1937          * old.  Otherwise we require --force.
1938          */
1939         o = deref_tag(parse_object(old_sha1), NULL, 0);
1940         if (!o || o->type != commit_type)
1941                 return 0;
1942         old = (struct commit *) o;
1943
1944         o = deref_tag(parse_object(new_sha1), NULL, 0);
1945         if (!o || o->type != commit_type)
1946                 return 0;
1947         new = (struct commit *) o;
1948
1949         if (parse_commit(new) < 0)
1950                 return 0;
1951
1952         used = list = NULL;
1953         commit_list_insert(new, &list);
1954         while (list) {
1955                 new = pop_most_recent_commit(&list, TMP_MARK);
1956                 commit_list_insert(new, &used);
1957                 if (new == old) {
1958                         found = 1;
1959                         break;
1960                 }
1961         }
1962         unmark_and_free(list, TMP_MARK);
1963         unmark_and_free(used, TMP_MARK);
1964         return found;
1965 }
1966
1967 static void mark_edge_parents_uninteresting(struct commit *commit)
1968 {
1969         struct commit_list *parents;
1970
1971         for (parents = commit->parents; parents; parents = parents->next) {
1972                 struct commit *parent = parents->item;
1973                 if (!(parent->object.flags & UNINTERESTING))
1974                         continue;
1975                 mark_tree_uninteresting(parent->tree);
1976         }
1977 }
1978
1979 static void mark_edges_uninteresting(struct commit_list *list)
1980 {
1981         for ( ; list; list = list->next) {
1982                 struct commit *commit = list->item;
1983
1984                 if (commit->object.flags & UNINTERESTING) {
1985                         mark_tree_uninteresting(commit->tree);
1986                         continue;
1987                 }
1988                 mark_edge_parents_uninteresting(commit);
1989         }
1990 }
1991
1992 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1993 {
1994         struct buffer *buf = (struct buffer *)ls->userData;
1995         unsigned char remote_sha1[20];
1996         struct object *o;
1997         int len;
1998         char *ref_info;
1999
2000         if (fetch_ref(ls->dentry_name, remote_sha1) != 0) {
2001                 fprintf(stderr,
2002                         "Unable to fetch ref %s from %s\n",
2003                         ls->dentry_name, remote->url);
2004                 aborted = 1;
2005                 return;
2006         }
2007
2008         o = parse_object(remote_sha1);
2009         if (!o) {
2010                 fprintf(stderr,
2011                         "Unable to parse object %s for remote ref %s\n",
2012                         sha1_to_hex(remote_sha1), ls->dentry_name);
2013                 aborted = 1;
2014                 return;
2015         }
2016
2017         len = strlen(ls->dentry_name) + 42;
2018         ref_info = xcalloc(len + 1, 1);
2019         sprintf(ref_info, "%s   %s\n",
2020                 sha1_to_hex(remote_sha1), ls->dentry_name);
2021         fwrite_buffer(ref_info, 1, len, buf);
2022         free(ref_info);
2023
2024         if (o->type == tag_type) {
2025                 o = deref_tag(o, ls->dentry_name, 0);
2026                 if (o) {
2027                         len = strlen(ls->dentry_name) + 45;
2028                         ref_info = xcalloc(len + 1, 1);
2029                         sprintf(ref_info, "%s   %s^{}\n",
2030                                 sha1_to_hex(o->sha1), ls->dentry_name);
2031                         fwrite_buffer(ref_info, 1, len, buf);
2032                         free(ref_info);
2033                 }
2034         }
2035 }
2036
2037 static void update_remote_info_refs(struct remote_lock *lock)
2038 {
2039         struct buffer buffer;
2040         struct active_request_slot *slot;
2041         struct slot_results results;
2042         char *if_header;
2043         struct curl_slist *dav_headers = NULL;
2044
2045         buffer.buffer = xmalloc(4096);
2046         memset(buffer.buffer, 0, 4096);
2047         buffer.size = 4096;
2048         buffer.posn = 0;
2049         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
2050                   add_remote_info_ref, &buffer);
2051         if (!aborted) {
2052                 if_header = xmalloc(strlen(lock->token) + 25);
2053                 sprintf(if_header, "If: (<opaquelocktoken:%s>)", lock->token);
2054                 dav_headers = curl_slist_append(dav_headers, if_header);
2055
2056                 slot = get_active_slot();
2057                 slot->results = &results;
2058                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
2059                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.posn);
2060                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
2061                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2062                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
2063                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
2064                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
2065                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
2066                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
2067
2068                 buffer.posn = 0;
2069
2070                 if (start_active_slot(slot)) {
2071                         run_active_slot(slot);
2072                         if (results.curl_result != CURLE_OK) {
2073                                 fprintf(stderr,
2074                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2075                                         results.curl_result, results.http_code);
2076                         }
2077                 }
2078                 free(if_header);
2079         }
2080         free(buffer.buffer);
2081 }
2082
2083 static int remote_exists(const char *path)
2084 {
2085         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2086         struct active_request_slot *slot;
2087         struct slot_results results;
2088
2089         sprintf(url, "%s%s", remote->url, path);
2090
2091         slot = get_active_slot();
2092         slot->results = &results;
2093         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2094         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2095
2096         if (start_active_slot(slot)) {
2097                 run_active_slot(slot);
2098                 if (results.http_code == 404)
2099                         return 0;
2100                 else if (results.curl_result == CURLE_OK)
2101                         return 1;
2102                 else
2103                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2104         } else {
2105                 fprintf(stderr, "Unable to start HEAD request\n");
2106         }
2107
2108         return -1;
2109 }
2110
2111 static void fetch_symref(char *path, char **symref, unsigned char *sha1)
2112 {
2113         char *url;
2114         struct buffer buffer;
2115         struct active_request_slot *slot;
2116         struct slot_results results;
2117
2118         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2119         sprintf(url, "%s%s", remote->url, path);
2120
2121         buffer.size = 4096;
2122         buffer.posn = 0;
2123         buffer.buffer = xmalloc(buffer.size);
2124
2125         slot = get_active_slot();
2126         slot->results = &results;
2127         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2128         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2129         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2130         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2131         if (start_active_slot(slot)) {
2132                 run_active_slot(slot);
2133                 if (results.curl_result != CURLE_OK) {
2134                         die("Couldn't get %s for remote symref\n%s",
2135                             url, curl_errorstr);
2136                 }
2137         } else {
2138                 die("Unable to start remote symref request");
2139         }
2140         free(url);
2141
2142         if (*symref != NULL)
2143                 free(*symref);
2144         *symref = NULL;
2145         memset(sha1, 0, 20);
2146
2147         if (buffer.posn == 0)
2148                 return;
2149
2150         /* If it's a symref, set the refname; otherwise try for a sha1 */
2151         if (!strncmp((char *)buffer.buffer, "ref: ", 5)) {
2152                 *symref = xcalloc(buffer.posn - 5, 1);
2153                 strncpy(*symref, (char *)buffer.buffer + 5, buffer.posn - 6);
2154         } else {
2155                 get_sha1_hex(buffer.buffer, sha1);
2156         }
2157
2158         free(buffer.buffer);
2159 }
2160
2161 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2162 {
2163         int pipe_fd[2];
2164         pid_t merge_base_pid;
2165         char line[PATH_MAX + 20];
2166         unsigned char merge_sha1[20];
2167         int verified = 0;
2168
2169         if (pipe(pipe_fd) < 0)
2170                 die("Verify merge base: pipe failed");
2171
2172         merge_base_pid = fork();
2173         if (!merge_base_pid) {
2174                 static const char *args[] = {
2175                         "merge-base",
2176                         "-a",
2177                         NULL,
2178                         NULL,
2179                         NULL
2180                 };
2181                 args[2] = strdup(sha1_to_hex(head_sha1));
2182                 args[3] = sha1_to_hex(branch_sha1);
2183
2184                 dup2(pipe_fd[1], 1);
2185                 close(pipe_fd[0]);
2186                 close(pipe_fd[1]);
2187                 execv_git_cmd(args);
2188                 die("merge-base setup failed");
2189         }
2190         if (merge_base_pid < 0)
2191                 die("merge-base fork failed");
2192
2193         dup2(pipe_fd[0], 0);
2194         close(pipe_fd[0]);
2195         close(pipe_fd[1]);
2196         while (fgets(line, sizeof(line), stdin) != NULL) {
2197                 if (get_sha1_hex(line, merge_sha1))
2198                         die("expected sha1, got garbage:\n %s", line);
2199                 if (!memcmp(branch_sha1, merge_sha1, 20)) {
2200                         verified = 1;
2201                         break;
2202                 }
2203         }
2204
2205         return verified;
2206 }
2207
2208 static int delete_remote_branch(char *pattern, int force)
2209 {
2210         struct ref *refs = remote_refs;
2211         struct ref *remote_ref = NULL;
2212         unsigned char head_sha1[20];
2213         char *symref = NULL;
2214         int match;
2215         int patlen = strlen(pattern);
2216         int i;
2217         struct active_request_slot *slot;
2218         struct slot_results results;
2219         char *url;
2220
2221         /* Find the remote branch(es) matching the specified branch name */
2222         for (match = 0; refs; refs = refs->next) {
2223                 char *name = refs->name;
2224                 int namelen = strlen(name);
2225                 if (namelen < patlen ||
2226                     memcmp(name + namelen - patlen, pattern, patlen))
2227                         continue;
2228                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2229                         continue;
2230                 match++;
2231                 remote_ref = refs;
2232         }
2233         if (match == 0)
2234                 return error("No remote branch matches %s", pattern);
2235         if (match != 1)
2236                 return error("More than one remote branch matches %s",
2237                              pattern);
2238
2239         /*
2240          * Remote HEAD must be a symref (not exactly foolproof; a remote
2241          * symlink to a symref will look like a symref)
2242          */
2243         fetch_symref("HEAD", &symref, head_sha1);
2244         if (!symref)
2245                 return error("Remote HEAD is not a symref");
2246
2247         /* Remote branch must not be the remote HEAD */
2248         for (i=0; symref && i<MAXDEPTH; i++) {
2249                 if (!strcmp(remote_ref->name, symref))
2250                         return error("Remote branch %s is the current HEAD",
2251                                      remote_ref->name);
2252                 fetch_symref(symref, &symref, head_sha1);
2253         }
2254
2255         /* Run extra sanity checks if delete is not forced */
2256         if (!force) {
2257                 /* Remote HEAD must resolve to a known object */
2258                 if (symref)
2259                         return error("Remote HEAD symrefs too deep");
2260                 if (is_zero_sha1(head_sha1))
2261                         return error("Unable to resolve remote HEAD");
2262                 if (!has_sha1_file(head_sha1))
2263                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2264
2265                 /* Remote branch must resolve to a known object */
2266                 if (is_zero_sha1(remote_ref->old_sha1))
2267                         return error("Unable to resolve remote branch %s",
2268                                      remote_ref->name);
2269                 if (!has_sha1_file(remote_ref->old_sha1))
2270                         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));
2271
2272                 /* Remote branch must be an ancestor of remote HEAD */
2273                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2274                         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);
2275                 }
2276         }
2277
2278         /* Send delete request */
2279         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2280         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2281         sprintf(url, "%s%s", remote->url, remote_ref->name);
2282         slot = get_active_slot();
2283         slot->results = &results;
2284         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2285         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2286         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2287         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2288         if (start_active_slot(slot)) {
2289                 run_active_slot(slot);
2290                 free(url);
2291                 if (results.curl_result != CURLE_OK)
2292                         return error("DELETE request failed (%d/%ld)\n",
2293                                      results.curl_result, results.http_code);
2294         } else {
2295                 free(url);
2296                 return error("Unable to start DELETE request");
2297         }
2298
2299         return 0;
2300 }
2301
2302 int main(int argc, char **argv)
2303 {
2304         struct transfer_request *request;
2305         struct transfer_request *next_request;
2306         int nr_refspec = 0;
2307         char **refspec = NULL;
2308         struct remote_lock *ref_lock = NULL;
2309         struct remote_lock *info_ref_lock = NULL;
2310         struct rev_info revs;
2311         int delete_branch = 0;
2312         int force_delete = 0;
2313         int objects_to_send;
2314         int rc = 0;
2315         int i;
2316
2317         setup_git_directory();
2318         setup_ident();
2319
2320         remote = xcalloc(sizeof(*remote), 1);
2321
2322         argv++;
2323         for (i = 1; i < argc; i++, argv++) {
2324                 char *arg = *argv;
2325
2326                 if (*arg == '-') {
2327                         if (!strcmp(arg, "--all")) {
2328                                 push_all = 1;
2329                                 continue;
2330                         }
2331                         if (!strcmp(arg, "--force")) {
2332                                 force_all = 1;
2333                                 continue;
2334                         }
2335                         if (!strcmp(arg, "--verbose")) {
2336                                 push_verbosely = 1;
2337                                 continue;
2338                         }
2339                         if (!strcmp(arg, "-d")) {
2340                                 delete_branch = 1;
2341                                 continue;
2342                         }
2343                         if (!strcmp(arg, "-D")) {
2344                                 delete_branch = 1;
2345                                 force_delete = 1;
2346                                 continue;
2347                         }
2348                 }
2349                 if (!remote->url) {
2350                         remote->url = arg;
2351                         char *path = strstr(arg, "//");
2352                         if (path) {
2353                                 path = index(path+2, '/');
2354                                 if (path)
2355                                         remote->path_len = strlen(path);
2356                         }
2357                         continue;
2358                 }
2359                 refspec = argv;
2360                 nr_refspec = argc - i;
2361                 break;
2362         }
2363
2364         if (!remote->url)
2365                 usage(http_push_usage);
2366
2367         if (delete_branch && nr_refspec != 1)
2368                 die("You must specify only one branch name when deleting a remote branch");
2369
2370         memset(remote_dir_exists, -1, 256);
2371
2372         http_init();
2373
2374         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2375         default_headers = curl_slist_append(default_headers, "Range:");
2376         default_headers = curl_slist_append(default_headers, "Destination:");
2377         default_headers = curl_slist_append(default_headers, "If:");
2378         default_headers = curl_slist_append(default_headers,
2379                                             "Pragma: no-cache");
2380
2381         /* Verify DAV compliance/lock support */
2382         if (!locking_available()) {
2383                 fprintf(stderr, "Error: no DAV locking support on remote repo %s\n", remote->url);
2384                 rc = 1;
2385                 goto cleanup;
2386         }
2387
2388         /* Check whether the remote has server info files */
2389         remote->can_update_info_refs = 0;
2390         remote->has_info_refs = remote_exists("info/refs");
2391         remote->has_info_packs = remote_exists("objects/info/packs");
2392         if (remote->has_info_refs) {
2393                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2394                 if (info_ref_lock)
2395                         remote->can_update_info_refs = 1;
2396         }
2397         if (remote->has_info_packs)
2398                 fetch_indices();
2399
2400         /* Get a list of all local and remote heads to validate refspecs */
2401         get_local_heads();
2402         fprintf(stderr, "Fetching remote heads...\n");
2403         get_dav_remote_heads();
2404
2405         /* Remove a remote branch if -d or -D was specified */
2406         if (delete_branch) {
2407                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2408                         fprintf(stderr, "Unable to delete remote branch %s\n",
2409                                 refspec[0]);
2410                 goto cleanup;
2411         }
2412
2413         /* match them up */
2414         if (!remote_tail)
2415                 remote_tail = &remote_refs;
2416         if (match_refs(local_refs, remote_refs, &remote_tail,
2417                        nr_refspec, refspec, push_all))
2418                 return -1;
2419         if (!remote_refs) {
2420                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2421                 return 0;
2422         }
2423
2424         int new_refs = 0;
2425         struct ref *ref;
2426         for (ref = remote_refs; ref; ref = ref->next) {
2427                 char old_hex[60], *new_hex;
2428                 if (!ref->peer_ref)
2429                         continue;
2430                 if (!memcmp(ref->old_sha1, ref->peer_ref->new_sha1, 20)) {
2431                         if (push_verbosely || 1)
2432                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2433                         continue;
2434                 }
2435
2436                 if (!force_all &&
2437                     !is_zero_sha1(ref->old_sha1) &&
2438                     !ref->force) {
2439                         if (!has_sha1_file(ref->old_sha1) ||
2440                             !ref_newer(ref->peer_ref->new_sha1,
2441                                        ref->old_sha1)) {
2442                                 /* We do not have the remote ref, or
2443                                  * we know that the remote ref is not
2444                                  * an ancestor of what we are trying to
2445                                  * push.  Either way this can be losing
2446                                  * commits at the remote end and likely
2447                                  * we were not up to date to begin with.
2448                                  */
2449                                 error("remote '%s' is not a strict "
2450                                       "subset of local ref '%s'. "
2451                                       "maybe you are not up-to-date and "
2452                                       "need to pull first?",
2453                                       ref->name,
2454                                       ref->peer_ref->name);
2455                                 rc = -2;
2456                                 continue;
2457                         }
2458                 }
2459                 memcpy(ref->new_sha1, ref->peer_ref->new_sha1, 20);
2460                 if (is_zero_sha1(ref->new_sha1)) {
2461                         error("cannot happen anymore");
2462                         rc = -3;
2463                         continue;
2464                 }
2465                 new_refs++;
2466                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2467                 new_hex = sha1_to_hex(ref->new_sha1);
2468
2469                 fprintf(stderr, "updating '%s'", ref->name);
2470                 if (strcmp(ref->name, ref->peer_ref->name))
2471                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2472                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2473
2474
2475                 /* Lock remote branch ref */
2476                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2477                 if (ref_lock == NULL) {
2478                         fprintf(stderr, "Unable to lock remote branch %s\n",
2479                                 ref->name);
2480                         rc = 1;
2481                         continue;
2482                 }
2483
2484                 /* Set up revision info for this refspec */
2485                 const char *commit_argv[4];
2486                 int commit_argc = 3;
2487                 char *new_sha1_hex = strdup(sha1_to_hex(ref->new_sha1));
2488                 char *old_sha1_hex = NULL;
2489                 commit_argv[1] = "--objects";
2490                 commit_argv[2] = new_sha1_hex;
2491                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2492                         old_sha1_hex = xmalloc(42);
2493                         sprintf(old_sha1_hex, "^%s",
2494                                 sha1_to_hex(ref->old_sha1));
2495                         commit_argv[3] = old_sha1_hex;
2496                         commit_argc++;
2497                 }
2498                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2499                 free(new_sha1_hex);
2500                 if (old_sha1_hex) {
2501                         free(old_sha1_hex);
2502                         commit_argv[1] = NULL;
2503                 }
2504
2505                 /* Generate a list of objects that need to be pushed */
2506                 pushing = 0;
2507                 prepare_revision_walk(&revs);
2508                 mark_edges_uninteresting(revs.commits);
2509                 objects_to_send = get_delta(&revs, ref_lock);
2510                 finish_all_active_slots();
2511
2512                 /* Push missing objects to remote, this would be a
2513                    convenient time to pack them first if appropriate. */
2514                 pushing = 1;
2515                 if (objects_to_send)
2516                         fprintf(stderr, "    sending %d objects\n",
2517                                 objects_to_send);
2518                 fill_active_slots();
2519                 finish_all_active_slots();
2520
2521                 /* Update the remote branch if all went well */
2522                 if (aborted || !update_remote(ref->new_sha1, ref_lock)) {
2523                         rc = 1;
2524                         goto unlock;
2525                 }
2526
2527         unlock:
2528                 if (!rc)
2529                         fprintf(stderr, "    done\n");
2530                 unlock_remote(ref_lock);
2531                 check_locks();
2532         }
2533
2534         /* Update remote server info if appropriate */
2535         if (remote->has_info_refs && new_refs) {
2536                 if (info_ref_lock && remote->can_update_info_refs) {
2537                         fprintf(stderr, "Updating remote server info\n");
2538                         update_remote_info_refs(info_ref_lock);
2539                 } else {
2540                         fprintf(stderr, "Unable to update server info\n");
2541                 }
2542         }
2543         if (info_ref_lock)
2544                 unlock_remote(info_ref_lock);
2545
2546  cleanup:
2547         free(remote);
2548
2549         curl_slist_free_all(no_pragma_header);
2550         curl_slist_free_all(default_headers);
2551
2552         http_cleanup();
2553
2554         request = request_queue_head;
2555         while (request != NULL) {
2556                 next_request = request->next;
2557                 release_request(request);
2558                 request = next_request;
2559         }
2560
2561         return rc;
2562 }