http-push.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14
  15 #include <expat.h>
  16
  17 static const char http_push_usage[] =
  18 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20 #ifndef XML_STATUS_OK
  21 enum XML_Status {
  22   XML_STATUS_OK = 1,
  23   XML_STATUS_ERROR = 0
  24 };
  25 #define XML_STATUS_OK    1
  26 #define XML_STATUS_ERROR 0
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 /* DAV methods */
  33 #define DAV_LOCK "LOCK"
  34 #define DAV_MKCOL "MKCOL"
  35 #define DAV_MOVE "MOVE"
  36 #define DAV_PROPFIND "PROPFIND"
  37 #define DAV_PUT "PUT"
  38 #define DAV_UNLOCK "UNLOCK"
  39 #define DAV_DELETE "DELETE"
  40
  41 /* DAV lock flags */
  42 #define DAV_PROP_LOCKWR (1u << 0)
  43 #define DAV_PROP_LOCKEX (1u << 1)
  44 #define DAV_LOCK_OK (1u << 2)
  45
  46 /* DAV XML properties */
  47 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53 #define DAV_PROPFIND_RESP ".multistatus.response"
  54 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  55 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57 /* DAV request body templates */
  58 #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>"
  59 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60 #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>"
  61
  62 #define LOCK_TIME 600
  63 #define LOCK_REFRESH 30
  64
  65 /* bits #0-15 in revision.h */
  66
  67 #define LOCAL    (1u<<16)
  68 #define REMOTE   (1u<<17)
  69 #define FETCHING (1u<<18)
  70 #define PUSHING  (1u<<19)
  71
  72 /* We allow "recursive" symbolic refs. Only within reason, though */
  73 #define MAXDEPTH 5
  74
  75 static int pushing;
  76 static int aborted;
  77 static signed char remote_dir_exists[256];
  78
  79 static struct curl_slist *no_pragma_header;
  80
  81 static int push_verbosely;
  82 static int push_all = MATCH_REFS_NONE;
  83 static int force_all;
  84 static int dry_run;
  85
  86 static struct object_list *objects;
  87
  88 struct repo
  89 {
  90         char *url;
  91         char *path;
  92         int path_len;
  93         int has_info_refs;
  94         int can_update_info_refs;
  95         int has_info_packs;
  96         struct packed_git *packs;
  97         struct remote_lock *locks;
  98 };
  99
 100 static struct repo *remote;
 101
 102 enum transfer_state {
 103         NEED_FETCH,
 104         RUN_FETCH_LOOSE,
 105         RUN_FETCH_PACKED,
 106         NEED_PUSH,
 107         RUN_MKCOL,
 108         RUN_PUT,
 109         RUN_MOVE,
 110         ABORTED,
 111         COMPLETE,
 112 };
 113
 114 struct transfer_request
 115 {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         char filename[PATH_MAX];
 123         char tmpfile[PATH_MAX];
 124         int local_fileno;
 125         FILE *local_stream;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         unsigned char real_sha1[20];
 131         git_SHA_CTX c;
 132         z_stream stream;
 133         int zret;
 134         int rename;
 135         void *userData;
 136         struct active_request_slot *slot;
 137         struct transfer_request *next;
 138 };
 139
 140 static struct transfer_request *request_queue_head;
 141
 142 struct xml_ctx
 143 {
 144         char *name;
 145         int len;
 146         char *cdata;
 147         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148         void *userData;
 149 };
 150
 151 struct remote_lock
 152 {
 153         char *url;
 154         char *owner;
 155         char *token;
 156         time_t start_time;
 157         long timeout;
 158         int refreshing;
 159         struct remote_lock *next;
 160 };
 161
 162 /* Flags that control remote_ls processing */
 163 #define PROCESS_FILES (1u << 0)
 164 #define PROCESS_DIRS  (1u << 1)
 165 #define RECURSIVE     (1u << 2)
 166
 167 /* Flags that remote_ls passes to callback functions */
 168 #define IS_DIR (1u << 0)
 169
 170 struct remote_ls_ctx
 171 {
 172         char *path;
 173         void (*userFunc)(struct remote_ls_ctx *ls);
 174         void *userData;
 175         int flags;
 176         char *dentry_name;
 177         int dentry_flags;
 178         struct remote_ls_ctx *parent;
 179 };
 180
 181 /* get_dav_token_headers options */
 182 enum dav_header_flag {
 183         DAV_HEADER_IF = (1u << 0),
 184         DAV_HEADER_LOCK = (1u << 1),
 185         DAV_HEADER_TIMEOUT = (1u << 2)
 186 };
 187
 188 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 189 {
 190         struct strbuf buf = STRBUF_INIT;
 191         struct curl_slist *dav_headers = NULL;
 192
 193         if (options & DAV_HEADER_IF) {
 194                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 195                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 196                 strbuf_reset(&buf);
 197         }
 198         if (options & DAV_HEADER_LOCK) {
 199                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 200                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 201                 strbuf_reset(&buf);
 202         }
 203         if (options & DAV_HEADER_TIMEOUT) {
 204                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 205                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 206                 strbuf_reset(&buf);
 207         }
 208         strbuf_release(&buf);
 209
 210         return dav_headers;
 211 }
 212
 213 static void append_remote_object_url(struct strbuf *buf, const char *url,
 214                                      const char *hex,
 215                                      int only_two_digit_prefix)
 216 {
 217         strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 218         if (!only_two_digit_prefix)
 219                 strbuf_addf(buf, "%s", hex+2);
 220 }
 221
 222 static void finish_request(struct transfer_request *request);
 223 static void release_request(struct transfer_request *request);
 224
 225 static void process_response(void *callback_data)
 226 {
 227         struct transfer_request *request =
 228                 (struct transfer_request *)callback_data;
 229
 230         finish_request(request);
 231 }
 232
 233 #ifdef USE_CURL_MULTI
 234
 235 static char *get_remote_object_url(const char *url, const char *hex,
 236                                    int only_two_digit_prefix)
 237 {
 238         struct strbuf buf = STRBUF_INIT;
 239         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 240         return strbuf_detach(&buf, NULL);
 241 }
 242
 243 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 244                                void *data)
 245 {
 246         unsigned char expn[4096];
 247         size_t size = eltsize * nmemb;
 248         int posn = 0;
 249         struct transfer_request *request = (struct transfer_request *)data;
 250         do {
 251                 ssize_t retval = xwrite(request->local_fileno,
 252                                        (char *) ptr + posn, size - posn);
 253                 if (retval < 0)
 254                         return posn;
 255                 posn += retval;
 256         } while (posn < size);
 257
 258         request->stream.avail_in = size;
 259         request->stream.next_in = ptr;
 260         do {
 261                 request->stream.next_out = expn;
 262                 request->stream.avail_out = sizeof(expn);
 263                 request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 264                 git_SHA1_Update(&request->c, expn,
 265                             sizeof(expn) - request->stream.avail_out);
 266         } while (request->stream.avail_in && request->zret == Z_OK);
 267         data_received++;
 268         return size;
 269 }
 270
 271 static void start_fetch_loose(struct transfer_request *request)
 272 {
 273         char *hex = sha1_to_hex(request->obj->sha1);
 274         char *filename;
 275         char prevfile[PATH_MAX];
 276         char *url;
 277         int prevlocal;
 278         unsigned char prev_buf[PREV_BUF_SIZE];
 279         ssize_t prev_read = 0;
 280         long prev_posn = 0;
 281         char range[RANGE_HEADER_SIZE];
 282         struct curl_slist *range_header = NULL;
 283         struct active_request_slot *slot;
 284
 285         filename = sha1_file_name(request->obj->sha1);
 286         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 287         snprintf(request->tmpfile, sizeof(request->tmpfile),
 288                  "%s.temp", filename);
 289
 290         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 291         unlink(prevfile);
 292         rename(request->tmpfile, prevfile);
 293         unlink(request->tmpfile);
 294
 295         if (request->local_fileno != -1)
 296                 error("fd leakage in start: %d", request->local_fileno);
 297         request->local_fileno = open(request->tmpfile,
 298                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 299         /* This could have failed due to the "lazy directory creation";
 300          * try to mkdir the last path component.
 301          */
 302         if (request->local_fileno < 0 && errno == ENOENT) {
 303                 char *dir = strrchr(request->tmpfile, '/');
 304                 if (dir) {
 305                         *dir = 0;
 306                         mkdir(request->tmpfile, 0777);
 307                         *dir = '/';
 308                 }
 309                 request->local_fileno = open(request->tmpfile,
 310                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 311         }
 312
 313         if (request->local_fileno < 0) {
 314                 request->state = ABORTED;
 315                 error("Couldn't create temporary file %s for %s: %s",
 316                       request->tmpfile, request->filename, strerror(errno));
 317                 return;
 318         }
 319
 320         memset(&request->stream, 0, sizeof(request->stream));
 321
 322         git_inflate_init(&request->stream);
 323
 324         git_SHA1_Init(&request->c);
 325
 326         url = get_remote_object_url(remote->url, hex, 0);
 327         request->url = xstrdup(url);
 328
 329         /* If a previous temp file is present, process what was already
 330            fetched. */
 331         prevlocal = open(prevfile, O_RDONLY);
 332         if (prevlocal != -1) {
 333                 do {
 334                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 335                         if (prev_read>0) {
 336                                 if (fwrite_sha1_file(prev_buf,
 337                                                      1,
 338                                                      prev_read,
 339                                                      request) == prev_read) {
 340                                         prev_posn += prev_read;
 341                                 } else {
 342                                         prev_read = -1;
 343                                 }
 344                         }
 345                 } while (prev_read > 0);
 346                 close(prevlocal);
 347         }
 348         unlink(prevfile);
 349
 350         /* Reset inflate/SHA1 if there was an error reading the previous temp
 351            file; also rewind to the beginning of the local file. */
 352         if (prev_read == -1) {
 353                 memset(&request->stream, 0, sizeof(request->stream));
 354                 git_inflate_init(&request->stream);
 355                 git_SHA1_Init(&request->c);
 356                 if (prev_posn>0) {
 357                         prev_posn = 0;
 358                         lseek(request->local_fileno, 0, SEEK_SET);
 359                         ftruncate(request->local_fileno, 0);
 360                 }
 361         }
 362
 363         slot = get_active_slot();
 364         slot->callback_func = process_response;
 365         slot->callback_data = request;
 366         request->slot = slot;
 367
 368         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 369         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 370         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 371         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 372         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 373
 374         /* If we have successfully processed data from a previous fetch
 375            attempt, only fetch the data we don't already have. */
 376         if (prev_posn>0) {
 377                 if (push_verbosely)
 378                         fprintf(stderr,
 379                                 "Resuming fetch of object %s at byte %ld\n",
 380                                 hex, prev_posn);
 381                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 382                 range_header = curl_slist_append(range_header, range);
 383                 curl_easy_setopt(slot->curl,
 384                                  CURLOPT_HTTPHEADER, range_header);
 385         }
 386
 387         /* Try to get the request started, abort the request on error */
 388         request->state = RUN_FETCH_LOOSE;
 389         if (!start_active_slot(slot)) {
 390                 fprintf(stderr, "Unable to start GET request\n");
 391                 remote->can_update_info_refs = 0;
 392                 release_request(request);
 393         }
 394 }
 395
 396 static void start_mkcol(struct transfer_request *request)
 397 {
 398         char *hex = sha1_to_hex(request->obj->sha1);
 399         struct active_request_slot *slot;
 400
 401         request->url = get_remote_object_url(remote->url, hex, 1);
 402
 403         slot = get_active_slot();
 404         slot->callback_func = process_response;
 405         slot->callback_data = request;
 406         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 407         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 408         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 409         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 410         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 411
 412         if (start_active_slot(slot)) {
 413                 request->slot = slot;
 414                 request->state = RUN_MKCOL;
 415         } else {
 416                 request->state = ABORTED;
 417                 free(request->url);
 418                 request->url = NULL;
 419         }
 420 }
 421 #endif
 422
 423 static void start_fetch_packed(struct transfer_request *request)
 424 {
 425         char *url;
 426         struct packed_git *target;
 427         FILE *packfile;
 428         char *filename;
 429         long prev_posn = 0;
 430         char range[RANGE_HEADER_SIZE];
 431         struct curl_slist *range_header = NULL;
 432
 433         struct transfer_request *check_request = request_queue_head;
 434         struct active_request_slot *slot;
 435
 436         target = find_sha1_pack(request->obj->sha1, remote->packs);
 437         if (!target) {
 438                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 439                 remote->can_update_info_refs = 0;
 440                 release_request(request);
 441                 return;
 442         }
 443
 444         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 445         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 446
 447         filename = sha1_pack_name(target->sha1);
 448         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 449         snprintf(request->tmpfile, sizeof(request->tmpfile),
 450                  "%s.temp", filename);
 451
 452         url = xmalloc(strlen(remote->url) + 64);
 453         sprintf(url, "%sobjects/pack/pack-%s.pack",
 454                 remote->url, sha1_to_hex(target->sha1));
 455
 456         /* Make sure there isn't another open request for this pack */
 457         while (check_request) {
 458                 if (check_request->state == RUN_FETCH_PACKED &&
 459                     !strcmp(check_request->url, url)) {
 460                         free(url);
 461                         release_request(request);
 462                         return;
 463                 }
 464                 check_request = check_request->next;
 465         }
 466
 467         packfile = fopen(request->tmpfile, "a");
 468         if (!packfile) {
 469                 fprintf(stderr, "Unable to open local file %s for pack",
 470                         request->tmpfile);
 471                 remote->can_update_info_refs = 0;
 472                 free(url);
 473                 return;
 474         }
 475
 476         slot = get_active_slot();
 477         slot->callback_func = process_response;
 478         slot->callback_data = request;
 479         request->slot = slot;
 480         request->local_stream = packfile;
 481         request->userData = target;
 482
 483         request->url = url;
 484         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 485         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 486         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 487         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 488         slot->local = packfile;
 489
 490         /* If there is data present from a previous transfer attempt,
 491            resume where it left off */
 492         prev_posn = ftell(packfile);
 493         if (prev_posn>0) {
 494                 if (push_verbosely)
 495                         fprintf(stderr,
 496                                 "Resuming fetch of pack %s at byte %ld\n",
 497                                 sha1_to_hex(target->sha1), prev_posn);
 498                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 499                 range_header = curl_slist_append(range_header, range);
 500                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 501         }
 502
 503         /* Try to get the request started, abort the request on error */
 504         request->state = RUN_FETCH_PACKED;
 505         if (!start_active_slot(slot)) {
 506                 fprintf(stderr, "Unable to start GET request\n");
 507                 remote->can_update_info_refs = 0;
 508                 release_request(request);
 509         }
 510 }
 511
 512 static void start_put(struct transfer_request *request)
 513 {
 514         char *hex = sha1_to_hex(request->obj->sha1);
 515         struct active_request_slot *slot;
 516         struct strbuf buf = STRBUF_INIT;
 517         enum object_type type;
 518         char hdr[50];
 519         void *unpacked;
 520         unsigned long len;
 521         int hdrlen;
 522         ssize_t size;
 523         z_stream stream;
 524
 525         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 526         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 527
 528         /* Set it up */
 529         memset(&stream, 0, sizeof(stream));
 530         deflateInit(&stream, zlib_compression_level);
 531         size = deflateBound(&stream, len + hdrlen);
 532         strbuf_init(&request->buffer.buf, size);
 533         request->buffer.posn = 0;
 534
 535         /* Compress it */
 536         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 537         stream.avail_out = size;
 538
 539         /* First header.. */
 540         stream.next_in = (void *)hdr;
 541         stream.avail_in = hdrlen;
 542         while (deflate(&stream, 0) == Z_OK)
 543                 /* nothing */;
 544
 545         /* Then the data itself.. */
 546         stream.next_in = unpacked;
 547         stream.avail_in = len;
 548         while (deflate(&stream, Z_FINISH) == Z_OK)
 549                 /* nothing */;
 550         deflateEnd(&stream);
 551         free(unpacked);
 552
 553         request->buffer.buf.len = stream.total_out;
 554
 555         strbuf_addstr(&buf, "Destination: ");
 556         append_remote_object_url(&buf, remote->url, hex, 0);
 557         request->dest = strbuf_detach(&buf, NULL);
 558
 559         append_remote_object_url(&buf, remote->url, hex, 0);
 560         strbuf_addstr(&buf, "_");
 561         strbuf_addstr(&buf, request->lock->token);
 562         request->url = strbuf_detach(&buf, NULL);
 563
 564         slot = get_active_slot();
 565         slot->callback_func = process_response;
 566         slot->callback_data = request;
 567         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 568         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 569         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 570         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 571         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 572         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 573         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 574         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 575         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 576
 577         if (start_active_slot(slot)) {
 578                 request->slot = slot;
 579                 request->state = RUN_PUT;
 580         } else {
 581                 request->state = ABORTED;
 582                 free(request->url);
 583                 request->url = NULL;
 584         }
 585 }
 586
 587 static void start_move(struct transfer_request *request)
 588 {
 589         struct active_request_slot *slot;
 590         struct curl_slist *dav_headers = NULL;
 591
 592         slot = get_active_slot();
 593         slot->callback_func = process_response;
 594         slot->callback_data = request;
 595         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 596         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 597         dav_headers = curl_slist_append(dav_headers, request->dest);
 598         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 599         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 600         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 601         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 602
 603         if (start_active_slot(slot)) {
 604                 request->slot = slot;
 605                 request->state = RUN_MOVE;
 606         } else {
 607                 request->state = ABORTED;
 608                 free(request->url);
 609                 request->url = NULL;
 610         }
 611 }
 612
 613 static int refresh_lock(struct remote_lock *lock)
 614 {
 615         struct active_request_slot *slot;
 616         struct slot_results results;
 617         struct curl_slist *dav_headers;
 618         int rc = 0;
 619
 620         lock->refreshing = 1;
 621
 622         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 623
 624         slot = get_active_slot();
 625         slot->results = &results;
 626         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 627         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 628         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 629         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 630         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 631
 632         if (start_active_slot(slot)) {
 633                 run_active_slot(slot);
 634                 if (results.curl_result != CURLE_OK) {
 635                         fprintf(stderr, "LOCK HTTP error %ld\n",
 636                                 results.http_code);
 637                 } else {
 638                         lock->start_time = time(NULL);
 639                         rc = 1;
 640                 }
 641         }
 642
 643         lock->refreshing = 0;
 644         curl_slist_free_all(dav_headers);
 645
 646         return rc;
 647 }
 648
 649 static void check_locks(void)
 650 {
 651         struct remote_lock *lock = remote->locks;
 652         time_t current_time = time(NULL);
 653         int time_remaining;
 654
 655         while (lock) {
 656                 time_remaining = lock->start_time + lock->timeout -
 657                         current_time;
 658                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 659                         if (!refresh_lock(lock)) {
 660                                 fprintf(stderr,
 661                                         "Unable to refresh lock for %s\n",
 662                                         lock->url);
 663                                 aborted = 1;
 664                                 return;
 665                         }
 666                 }
 667                 lock = lock->next;
 668         }
 669 }
 670
 671 static void release_request(struct transfer_request *request)
 672 {
 673         struct transfer_request *entry = request_queue_head;
 674
 675         if (request == request_queue_head) {
 676                 request_queue_head = request->next;
 677         } else {
 678                 while (entry->next != NULL && entry->next != request)
 679                         entry = entry->next;
 680                 if (entry->next == request)
 681                         entry->next = entry->next->next;
 682         }
 683
 684         if (request->local_fileno != -1)
 685                 close(request->local_fileno);
 686         if (request->local_stream)
 687                 fclose(request->local_stream);
 688         free(request->url);
 689         free(request);
 690 }
 691
 692 static void finish_request(struct transfer_request *request)
 693 {
 694         struct stat st;
 695         struct packed_git *target;
 696         struct packed_git **lst;
 697
 698         request->curl_result = request->slot->curl_result;
 699         request->http_code = request->slot->http_code;
 700         request->slot = NULL;
 701
 702         /* Keep locks active */
 703         check_locks();
 704
 705         if (request->headers != NULL)
 706                 curl_slist_free_all(request->headers);
 707
 708         /* URL is reused for MOVE after PUT */
 709         if (request->state != RUN_PUT) {
 710                 free(request->url);
 711                 request->url = NULL;
 712         }
 713
 714         if (request->state == RUN_MKCOL) {
 715                 if (request->curl_result == CURLE_OK ||
 716                     request->http_code == 405) {
 717                         remote_dir_exists[request->obj->sha1[0]] = 1;
 718                         start_put(request);
 719                 } else {
 720                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 721                                 sha1_to_hex(request->obj->sha1),
 722                                 request->curl_result, request->http_code);
 723                         request->state = ABORTED;
 724                         aborted = 1;
 725                 }
 726         } else if (request->state == RUN_PUT) {
 727                 if (request->curl_result == CURLE_OK) {
 728                         start_move(request);
 729                 } else {
 730                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 731                                 sha1_to_hex(request->obj->sha1),
 732                                 request->curl_result, request->http_code);
 733                         request->state = ABORTED;
 734                         aborted = 1;
 735                 }
 736         } else if (request->state == RUN_MOVE) {
 737                 if (request->curl_result == CURLE_OK) {
 738                         if (push_verbosely)
 739                                 fprintf(stderr, "    sent %s\n",
 740                                         sha1_to_hex(request->obj->sha1));
 741                         request->obj->flags |= REMOTE;
 742                         release_request(request);
 743                 } else {
 744                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 745                                 sha1_to_hex(request->obj->sha1),
 746                                 request->curl_result, request->http_code);
 747                         request->state = ABORTED;
 748                         aborted = 1;
 749                 }
 750         } else if (request->state == RUN_FETCH_LOOSE) {
 751                 fchmod(request->local_fileno, 0444);
 752                 close(request->local_fileno); request->local_fileno = -1;
 753
 754                 if (request->curl_result != CURLE_OK &&
 755                     request->http_code != 416) {
 756                         if (stat(request->tmpfile, &st) == 0) {
 757                                 if (st.st_size == 0)
 758                                         unlink(request->tmpfile);
 759                         }
 760                 } else {
 761                         if (request->http_code == 416)
 762                                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 763
 764                         git_inflate_end(&request->stream);
 765                         git_SHA1_Final(request->real_sha1, &request->c);
 766                         if (request->zret != Z_STREAM_END) {
 767                                 unlink(request->tmpfile);
 768                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 769                                 unlink(request->tmpfile);
 770                         } else {
 771                                 request->rename =
 772                                         move_temp_to_file(
 773                                                 request->tmpfile,
 774                                                 request->filename);
 775                                 if (request->rename == 0) {
 776                                         request->obj->flags |= (LOCAL | REMOTE);
 777                                 }
 778                         }
 779                 }
 780
 781                 /* Try fetching packed if necessary */
 782                 if (request->obj->flags & LOCAL)
 783                         release_request(request);
 784                 else
 785                         start_fetch_packed(request);
 786
 787         } else if (request->state == RUN_FETCH_PACKED) {
 788                 if (request->curl_result != CURLE_OK) {
 789                         fprintf(stderr, "Unable to get pack file %s\n%s",
 790                                 request->url, curl_errorstr);
 791                         remote->can_update_info_refs = 0;
 792                 } else {
 793                         off_t pack_size = ftell(request->local_stream);
 794
 795                         fclose(request->local_stream);
 796                         request->local_stream = NULL;
 797                         if (!move_temp_to_file(request->tmpfile,
 798                                                request->filename)) {
 799                                 target = (struct packed_git *)request->userData;
 800                                 target->pack_size = pack_size;
 801                                 lst = &remote->packs;
 802                                 while (*lst != target)
 803                                         lst = &((*lst)->next);
 804                                 *lst = (*lst)->next;
 805
 806                                 if (!verify_pack(target))
 807                                         install_packed_git(target);
 808                                 else
 809                                         remote->can_update_info_refs = 0;
 810                         }
 811                 }
 812                 release_request(request);
 813         }
 814 }
 815
 816 #ifdef USE_CURL_MULTI
 817 static int fill_active_slot(void *unused)
 818 {
 819         struct transfer_request *request = request_queue_head;
 820
 821         if (aborted)
 822                 return 0;
 823
 824         for (request = request_queue_head; request; request = request->next) {
 825                 if (request->state == NEED_FETCH) {
 826                         start_fetch_loose(request);
 827                         return 1;
 828                 } else if (pushing && request->state == NEED_PUSH) {
 829                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 830                                 start_put(request);
 831                         } else {
 832                                 start_mkcol(request);
 833                         }
 834                         return 1;
 835                 }
 836         }
 837         return 0;
 838 }
 839 #endif
 840
 841 static void get_remote_object_list(unsigned char parent);
 842
 843 static void add_fetch_request(struct object *obj)
 844 {
 845         struct transfer_request *request;
 846
 847         check_locks();
 848
 849         /*
 850          * Don't fetch the object if it's known to exist locally
 851          * or is already in the request queue
 852          */
 853         if (remote_dir_exists[obj->sha1[0]] == -1)
 854                 get_remote_object_list(obj->sha1[0]);
 855         if (obj->flags & (LOCAL | FETCHING))
 856                 return;
 857
 858         obj->flags |= FETCHING;
 859         request = xmalloc(sizeof(*request));
 860         request->obj = obj;
 861         request->url = NULL;
 862         request->lock = NULL;
 863         request->headers = NULL;
 864         request->local_fileno = -1;
 865         request->local_stream = NULL;
 866         request->state = NEED_FETCH;
 867         request->next = request_queue_head;
 868         request_queue_head = request;
 869
 870 #ifdef USE_CURL_MULTI
 871         fill_active_slots();
 872         step_active_slots();
 873 #endif
 874 }
 875
 876 static int add_send_request(struct object *obj, struct remote_lock *lock)
 877 {
 878         struct transfer_request *request = request_queue_head;
 879         struct packed_git *target;
 880
 881         /* Keep locks active */
 882         check_locks();
 883
 884         /*
 885          * Don't push the object if it's known to exist on the remote
 886          * or is already in the request queue
 887          */
 888         if (remote_dir_exists[obj->sha1[0]] == -1)
 889                 get_remote_object_list(obj->sha1[0]);
 890         if (obj->flags & (REMOTE | PUSHING))
 891                 return 0;
 892         target = find_sha1_pack(obj->sha1, remote->packs);
 893         if (target) {
 894                 obj->flags |= REMOTE;
 895                 return 0;
 896         }
 897
 898         obj->flags |= PUSHING;
 899         request = xmalloc(sizeof(*request));
 900         request->obj = obj;
 901         request->url = NULL;
 902         request->lock = lock;
 903         request->headers = NULL;
 904         request->local_fileno = -1;
 905         request->local_stream = NULL;
 906         request->state = NEED_PUSH;
 907         request->next = request_queue_head;
 908         request_queue_head = request;
 909
 910 #ifdef USE_CURL_MULTI
 911         fill_active_slots();
 912         step_active_slots();
 913 #endif
 914
 915         return 1;
 916 }
 917
 918 static int fetch_index(unsigned char *sha1)
 919 {
 920         char *hex = sha1_to_hex(sha1);
 921         char *filename;
 922         char *url;
 923         char tmpfile[PATH_MAX];
 924         long prev_posn = 0;
 925         char range[RANGE_HEADER_SIZE];
 926         struct curl_slist *range_header = NULL;
 927
 928         FILE *indexfile;
 929         struct active_request_slot *slot;
 930         struct slot_results results;
 931
 932         /* Don't use the index if the pack isn't there */
 933         url = xmalloc(strlen(remote->url) + 64);
 934         sprintf(url, "%sobjects/pack/pack-%s.pack", remote->url, hex);
 935         slot = get_active_slot();
 936         slot->results = &results;
 937         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 938         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 939         if (start_active_slot(slot)) {
 940                 run_active_slot(slot);
 941                 if (results.curl_result != CURLE_OK) {
 942                         free(url);
 943                         return error("Unable to verify pack %s is available",
 944                                      hex);
 945                 }
 946         } else {
 947                 free(url);
 948                 return error("Unable to start request");
 949         }
 950
 951         if (has_pack_index(sha1)) {
 952                 free(url);
 953                 return 0;
 954         }
 955
 956         if (push_verbosely)
 957                 fprintf(stderr, "Getting index for pack %s\n", hex);
 958
 959         sprintf(url, "%sobjects/pack/pack-%s.idx", remote->url, hex);
 960
 961         filename = sha1_pack_index_name(sha1);
 962         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 963         indexfile = fopen(tmpfile, "a");
 964         if (!indexfile) {
 965                 free(url);
 966                 return error("Unable to open local file %s for pack index",
 967                              tmpfile);
 968         }
 969
 970         slot = get_active_slot();
 971         slot->results = &results;
 972         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 973         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 974         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 975         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 976         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 977         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 978         slot->local = indexfile;
 979
 980         /* If there is data present from a previous transfer attempt,
 981            resume where it left off */
 982         prev_posn = ftell(indexfile);
 983         if (prev_posn>0) {
 984                 if (push_verbosely)
 985                         fprintf(stderr,
 986                                 "Resuming fetch of index for pack %s at byte %ld\n",
 987                                 hex, prev_posn);
 988                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 989                 range_header = curl_slist_append(range_header, range);
 990                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 991         }
 992
 993         if (start_active_slot(slot)) {
 994                 run_active_slot(slot);
 995                 if (results.curl_result != CURLE_OK) {
 996                         free(url);
 997                         fclose(indexfile);
 998                         return error("Unable to get pack index %s\n%s", url,
 999                                      curl_errorstr);
1000                 }
1001         } else {
1002                 free(url);
1003                 fclose(indexfile);
1004                 return error("Unable to start request");
1005         }
1006
1007         free(url);
1008         fclose(indexfile);
1009
1010         return move_temp_to_file(tmpfile, filename);
1011 }
1012
1013 static int setup_index(unsigned char *sha1)
1014 {
1015         struct packed_git *new_pack;
1016
1017         if (fetch_index(sha1))
1018                 return -1;
1019
1020         new_pack = parse_pack_index(sha1);
1021         new_pack->next = remote->packs;
1022         remote->packs = new_pack;
1023         return 0;
1024 }
1025
1026 static int fetch_indices(void)
1027 {
1028         unsigned char sha1[20];
1029         char *url;
1030         struct strbuf buffer = STRBUF_INIT;
1031         char *data;
1032         int i = 0;
1033
1034         struct active_request_slot *slot;
1035         struct slot_results results;
1036
1037         if (push_verbosely)
1038                 fprintf(stderr, "Getting pack list\n");
1039
1040         url = xmalloc(strlen(remote->url) + 20);
1041         sprintf(url, "%sobjects/info/packs", remote->url);
1042
1043         slot = get_active_slot();
1044         slot->results = &results;
1045         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1046         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1047         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1048         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1049         if (start_active_slot(slot)) {
1050                 run_active_slot(slot);
1051                 if (results.curl_result != CURLE_OK) {
1052                         strbuf_release(&buffer);
1053                         free(url);
1054                         if (results.http_code == 404)
1055                                 return 0;
1056                         else
1057                                 return error("%s", curl_errorstr);
1058                 }
1059         } else {
1060                 strbuf_release(&buffer);
1061                 free(url);
1062                 return error("Unable to start request");
1063         }
1064         free(url);
1065
1066         data = buffer.buf;
1067         while (i < buffer.len) {
1068                 switch (data[i]) {
1069                 case 'P':
1070                         i++;
1071                         if (i + 52 < buffer.len &&
1072                             !prefixcmp(data + i, " pack-") &&
1073                             !prefixcmp(data + i + 46, ".pack\n")) {
1074                                 get_sha1_hex(data + i + 6, sha1);
1075                                 setup_index(sha1);
1076                                 i += 51;
1077                                 break;
1078                         }
1079                 default:
1080                         while (data[i] != '\n')
1081                                 i++;
1082                 }
1083                 i++;
1084         }
1085
1086         strbuf_release(&buffer);
1087         return 0;
1088 }
1089
1090 static void one_remote_object(const char *hex)
1091 {
1092         unsigned char sha1[20];
1093         struct object *obj;
1094
1095         if (get_sha1_hex(hex, sha1) != 0)
1096                 return;
1097
1098         obj = lookup_object(sha1);
1099         if (!obj)
1100                 obj = parse_object(sha1);
1101
1102         /* Ignore remote objects that don't exist locally */
1103         if (!obj)
1104                 return;
1105
1106         obj->flags |= REMOTE;
1107         if (!object_list_contains(objects, obj))
1108                 object_list_insert(obj, &objects);
1109 }
1110
1111 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1112 {
1113         int *lock_flags = (int *)ctx->userData;
1114
1115         if (tag_closed) {
1116                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1117                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1118                             (*lock_flags & DAV_PROP_LOCKWR)) {
1119                                 *lock_flags |= DAV_LOCK_OK;
1120                         }
1121                         *lock_flags &= DAV_LOCK_OK;
1122                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1123                         *lock_flags |= DAV_PROP_LOCKWR;
1124                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1125                         *lock_flags |= DAV_PROP_LOCKEX;
1126                 }
1127         }
1128 }
1129
1130 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1131 {
1132         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1133
1134         if (tag_closed && ctx->cdata) {
1135                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1136                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1137                         strcpy(lock->owner, ctx->cdata);
1138                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1139                         if (!prefixcmp(ctx->cdata, "Second-"))
1140                                 lock->timeout =
1141                                         strtol(ctx->cdata + 7, NULL, 10);
1142                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1143                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1144                         strcpy(lock->token, ctx->cdata);
1145                 }
1146         }
1147 }
1148
1149 static void one_remote_ref(char *refname);
1150
1151 static void
1152 xml_start_tag(void *userData, const char *name, const char **atts)
1153 {
1154         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1155         const char *c = strchr(name, ':');
1156         int new_len;
1157
1158         if (c == NULL)
1159                 c = name;
1160         else
1161                 c++;
1162
1163         new_len = strlen(ctx->name) + strlen(c) + 2;
1164
1165         if (new_len > ctx->len) {
1166                 ctx->name = xrealloc(ctx->name, new_len);
1167                 ctx->len = new_len;
1168         }
1169         strcat(ctx->name, ".");
1170         strcat(ctx->name, c);
1171
1172         free(ctx->cdata);
1173         ctx->cdata = NULL;
1174
1175         ctx->userFunc(ctx, 0);
1176 }
1177
1178 static void
1179 xml_end_tag(void *userData, const char *name)
1180 {
1181         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1182         const char *c = strchr(name, ':');
1183         char *ep;
1184
1185         ctx->userFunc(ctx, 1);
1186
1187         if (c == NULL)
1188                 c = name;
1189         else
1190                 c++;
1191
1192         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1193         *ep = 0;
1194 }
1195
1196 static void
1197 xml_cdata(void *userData, const XML_Char *s, int len)
1198 {
1199         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1200         free(ctx->cdata);
1201         ctx->cdata = xmemdupz(s, len);
1202 }
1203
1204 static struct remote_lock *lock_remote(const char *path, long timeout)
1205 {
1206         struct active_request_slot *slot;
1207         struct slot_results results;
1208         struct buffer out_buffer = { STRBUF_INIT, 0 };
1209         struct strbuf in_buffer = STRBUF_INIT;
1210         char *url;
1211         char *ep;
1212         char timeout_header[25];
1213         struct remote_lock *lock = NULL;
1214         struct curl_slist *dav_headers = NULL;
1215         struct xml_ctx ctx;
1216
1217         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1218         sprintf(url, "%s%s", remote->url, path);
1219
1220         /* Make sure leading directories exist for the remote ref */
1221         ep = strchr(url + strlen(remote->url) + 1, '/');
1222         while (ep) {
1223                 char saved_character = ep[1];
1224                 ep[1] = '\0';
1225                 slot = get_active_slot();
1226                 slot->results = &results;
1227                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1228                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1229                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1230                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1231                 if (start_active_slot(slot)) {
1232                         run_active_slot(slot);
1233                         if (results.curl_result != CURLE_OK &&
1234                             results.http_code != 405) {
1235                                 fprintf(stderr,
1236                                         "Unable to create branch path %s\n",
1237                                         url);
1238                                 free(url);
1239                                 return NULL;
1240                         }
1241                 } else {
1242                         fprintf(stderr, "Unable to start MKCOL request\n");
1243                         free(url);
1244                         return NULL;
1245                 }
1246                 ep[1] = saved_character;
1247                 ep = strchr(ep + 1, '/');
1248         }
1249
1250         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, git_default_email);
1251
1252         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1253         dav_headers = curl_slist_append(dav_headers, timeout_header);
1254         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1255
1256         slot = get_active_slot();
1257         slot->results = &results;
1258         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1259         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1260         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1261         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1262         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1263         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1264         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1265         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1266         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1267
1268         lock = xcalloc(1, sizeof(*lock));
1269         lock->timeout = -1;
1270
1271         if (start_active_slot(slot)) {
1272                 run_active_slot(slot);
1273                 if (results.curl_result == CURLE_OK) {
1274                         XML_Parser parser = XML_ParserCreate(NULL);
1275                         enum XML_Status result;
1276                         ctx.name = xcalloc(10, 1);
1277                         ctx.len = 0;
1278                         ctx.cdata = NULL;
1279                         ctx.userFunc = handle_new_lock_ctx;
1280                         ctx.userData = lock;
1281                         XML_SetUserData(parser, &ctx);
1282                         XML_SetElementHandler(parser, xml_start_tag,
1283                                               xml_end_tag);
1284                         XML_SetCharacterDataHandler(parser, xml_cdata);
1285                         result = XML_Parse(parser, in_buffer.buf,
1286                                            in_buffer.len, 1);
1287                         free(ctx.name);
1288                         if (result != XML_STATUS_OK) {
1289                                 fprintf(stderr, "XML error: %s\n",
1290                                         XML_ErrorString(
1291                                                 XML_GetErrorCode(parser)));
1292                                 lock->timeout = -1;
1293                         }
1294                         XML_ParserFree(parser);
1295                 }
1296         } else {
1297                 fprintf(stderr, "Unable to start LOCK request\n");
1298         }
1299
1300         curl_slist_free_all(dav_headers);
1301         strbuf_release(&out_buffer.buf);
1302         strbuf_release(&in_buffer);
1303
1304         if (lock->token == NULL || lock->timeout <= 0) {
1305                 free(lock->token);
1306                 free(lock->owner);
1307                 free(url);
1308                 free(lock);
1309                 lock = NULL;
1310         } else {
1311                 lock->url = url;
1312                 lock->start_time = time(NULL);
1313                 lock->next = remote->locks;
1314                 remote->locks = lock;
1315         }
1316
1317         return lock;
1318 }
1319
1320 static int unlock_remote(struct remote_lock *lock)
1321 {
1322         struct active_request_slot *slot;
1323         struct slot_results results;
1324         struct remote_lock *prev = remote->locks;
1325         struct curl_slist *dav_headers;
1326         int rc = 0;
1327
1328         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1329
1330         slot = get_active_slot();
1331         slot->results = &results;
1332         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1333         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1334         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1335         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1336
1337         if (start_active_slot(slot)) {
1338                 run_active_slot(slot);
1339                 if (results.curl_result == CURLE_OK)
1340                         rc = 1;
1341                 else
1342                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1343                                 results.http_code);
1344         } else {
1345                 fprintf(stderr, "Unable to start UNLOCK request\n");
1346         }
1347
1348         curl_slist_free_all(dav_headers);
1349
1350         if (remote->locks == lock) {
1351                 remote->locks = lock->next;
1352         } else {
1353                 while (prev && prev->next != lock)
1354                         prev = prev->next;
1355                 if (prev)
1356                         prev->next = prev->next->next;
1357         }
1358
1359         free(lock->owner);
1360         free(lock->url);
1361         free(lock->token);
1362         free(lock);
1363
1364         return rc;
1365 }
1366
1367 static void remove_locks(void)
1368 {
1369         struct remote_lock *lock = remote->locks;
1370
1371         fprintf(stderr, "Removing remote locks...\n");
1372         while (lock) {
1373                 unlock_remote(lock);
1374                 lock = lock->next;
1375         }
1376 }
1377
1378 static void remove_locks_on_signal(int signo)
1379 {
1380         remove_locks();
1381         sigchain_pop(signo);
1382         raise(signo);
1383 }
1384
1385 static void remote_ls(const char *path, int flags,
1386                       void (*userFunc)(struct remote_ls_ctx *ls),
1387                       void *userData);
1388
1389 static void process_ls_object(struct remote_ls_ctx *ls)
1390 {
1391         unsigned int *parent = (unsigned int *)ls->userData;
1392         char *path = ls->dentry_name;
1393         char *obj_hex;
1394
1395         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1396                 remote_dir_exists[*parent] = 1;
1397                 return;
1398         }
1399
1400         if (strlen(path) != 49)
1401                 return;
1402         path += 8;
1403         obj_hex = xmalloc(strlen(path));
1404         /* NB: path is not null-terminated, can not use strlcpy here */
1405         memcpy(obj_hex, path, 2);
1406         strcpy(obj_hex + 2, path + 3);
1407         one_remote_object(obj_hex);
1408         free(obj_hex);
1409 }
1410
1411 static void process_ls_ref(struct remote_ls_ctx *ls)
1412 {
1413         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1414                 fprintf(stderr, "  %s\n", ls->dentry_name);
1415                 return;
1416         }
1417
1418         if (!(ls->dentry_flags & IS_DIR))
1419                 one_remote_ref(ls->dentry_name);
1420 }
1421
1422 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1423 {
1424         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1425
1426         if (tag_closed) {
1427                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1428                         if (ls->dentry_flags & IS_DIR) {
1429                                 if (ls->flags & PROCESS_DIRS) {
1430                                         ls->userFunc(ls);
1431                                 }
1432                                 if (strcmp(ls->dentry_name, ls->path) &&
1433                                     ls->flags & RECURSIVE) {
1434                                         remote_ls(ls->dentry_name,
1435                                                   ls->flags,
1436                                                   ls->userFunc,
1437                                                   ls->userData);
1438                                 }
1439                         } else if (ls->flags & PROCESS_FILES) {
1440                                 ls->userFunc(ls);
1441                         }
1442                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1443                         char *path = ctx->cdata;
1444                         if (*ctx->cdata == 'h') {
1445                                 path = strstr(path, "//");
1446                                 if (path) {
1447                                         path = strchr(path+2, '/');
1448                                 }
1449                         }
1450                         if (path) {
1451                                 path += remote->path_len;
1452                                 ls->dentry_name = xstrdup(path);
1453                         }
1454                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1455                         ls->dentry_flags |= IS_DIR;
1456                 }
1457         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1458                 free(ls->dentry_name);
1459                 ls->dentry_name = NULL;
1460                 ls->dentry_flags = 0;
1461         }
1462 }
1463
1464 /*
1465  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1466  * should _only_ heed the information from that file, instead of trying to
1467  * determine the refs from the remote file system (badly: it does not even
1468  * know about packed-refs).
1469  */
1470 static void remote_ls(const char *path, int flags,
1471                       void (*userFunc)(struct remote_ls_ctx *ls),
1472                       void *userData)
1473 {
1474         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1475         struct active_request_slot *slot;
1476         struct slot_results results;
1477         struct strbuf in_buffer = STRBUF_INIT;
1478         struct buffer out_buffer = { STRBUF_INIT, 0 };
1479         struct curl_slist *dav_headers = NULL;
1480         struct xml_ctx ctx;
1481         struct remote_ls_ctx ls;
1482
1483         ls.flags = flags;
1484         ls.path = xstrdup(path);
1485         ls.dentry_name = NULL;
1486         ls.dentry_flags = 0;
1487         ls.userData = userData;
1488         ls.userFunc = userFunc;
1489
1490         sprintf(url, "%s%s", remote->url, path);
1491
1492         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1493
1494         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1495         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1496
1497         slot = get_active_slot();
1498         slot->results = &results;
1499         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1500         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1501         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1502         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1503         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1504         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1505         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1506         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1507         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1508
1509         if (start_active_slot(slot)) {
1510                 run_active_slot(slot);
1511                 if (results.curl_result == CURLE_OK) {
1512                         XML_Parser parser = XML_ParserCreate(NULL);
1513                         enum XML_Status result;
1514                         ctx.name = xcalloc(10, 1);
1515                         ctx.len = 0;
1516                         ctx.cdata = NULL;
1517                         ctx.userFunc = handle_remote_ls_ctx;
1518                         ctx.userData = &ls;
1519                         XML_SetUserData(parser, &ctx);
1520                         XML_SetElementHandler(parser, xml_start_tag,
1521                                               xml_end_tag);
1522                         XML_SetCharacterDataHandler(parser, xml_cdata);
1523                         result = XML_Parse(parser, in_buffer.buf,
1524                                            in_buffer.len, 1);
1525                         free(ctx.name);
1526
1527                         if (result != XML_STATUS_OK) {
1528                                 fprintf(stderr, "XML error: %s\n",
1529                                         XML_ErrorString(
1530                                                 XML_GetErrorCode(parser)));
1531                         }
1532                         XML_ParserFree(parser);
1533                 }
1534         } else {
1535                 fprintf(stderr, "Unable to start PROPFIND request\n");
1536         }
1537
1538         free(ls.path);
1539         free(url);
1540         strbuf_release(&out_buffer.buf);
1541         strbuf_release(&in_buffer);
1542         curl_slist_free_all(dav_headers);
1543 }
1544
1545 static void get_remote_object_list(unsigned char parent)
1546 {
1547         char path[] = "objects/XX/";
1548         static const char hex[] = "0123456789abcdef";
1549         unsigned int val = parent;
1550
1551         path[8] = hex[val >> 4];
1552         path[9] = hex[val & 0xf];
1553         remote_dir_exists[val] = 0;
1554         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1555                   process_ls_object, &val);
1556 }
1557
1558 static int locking_available(void)
1559 {
1560         struct active_request_slot *slot;
1561         struct slot_results results;
1562         struct strbuf in_buffer = STRBUF_INIT;
1563         struct buffer out_buffer = { STRBUF_INIT, 0 };
1564         struct curl_slist *dav_headers = NULL;
1565         struct xml_ctx ctx;
1566         int lock_flags = 0;
1567
1568         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, remote->url);
1569
1570         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1571         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1572
1573         slot = get_active_slot();
1574         slot->results = &results;
1575         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1576         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1577         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1578         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1579         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1580         curl_easy_setopt(slot->curl, CURLOPT_URL, remote->url);
1581         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1582         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1583         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1584
1585         if (start_active_slot(slot)) {
1586                 run_active_slot(slot);
1587                 if (results.curl_result == CURLE_OK) {
1588                         XML_Parser parser = XML_ParserCreate(NULL);
1589                         enum XML_Status result;
1590                         ctx.name = xcalloc(10, 1);
1591                         ctx.len = 0;
1592                         ctx.cdata = NULL;
1593                         ctx.userFunc = handle_lockprop_ctx;
1594                         ctx.userData = &lock_flags;
1595                         XML_SetUserData(parser, &ctx);
1596                         XML_SetElementHandler(parser, xml_start_tag,
1597                                               xml_end_tag);
1598                         result = XML_Parse(parser, in_buffer.buf,
1599                                            in_buffer.len, 1);
1600                         free(ctx.name);
1601
1602                         if (result != XML_STATUS_OK) {
1603                                 fprintf(stderr, "XML error: %s\n",
1604                                         XML_ErrorString(
1605                                                 XML_GetErrorCode(parser)));
1606                                 lock_flags = 0;
1607                         }
1608                         XML_ParserFree(parser);
1609                         if (!lock_flags)
1610                                 error("Error: no DAV locking support on %s",
1611                                       remote->url);
1612
1613                 } else {
1614                         error("Cannot access URL %s, return code %d",
1615                               remote->url, results.curl_result);
1616                         lock_flags = 0;
1617                 }
1618         } else {
1619                 error("Unable to start PROPFIND request on %s", remote->url);
1620         }
1621
1622         strbuf_release(&out_buffer.buf);
1623         strbuf_release(&in_buffer);
1624         curl_slist_free_all(dav_headers);
1625
1626         return lock_flags;
1627 }
1628
1629 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1630 {
1631         struct object_list *entry = xmalloc(sizeof(struct object_list));
1632         entry->item = obj;
1633         entry->next = *p;
1634         *p = entry;
1635         return &entry->next;
1636 }
1637
1638 static struct object_list **process_blob(struct blob *blob,
1639                                          struct object_list **p,
1640                                          struct name_path *path,
1641                                          const char *name)
1642 {
1643         struct object *obj = &blob->object;
1644
1645         obj->flags |= LOCAL;
1646
1647         if (obj->flags & (UNINTERESTING | SEEN))
1648                 return p;
1649
1650         obj->flags |= SEEN;
1651         return add_one_object(obj, p);
1652 }
1653
1654 static struct object_list **process_tree(struct tree *tree,
1655                                          struct object_list **p,
1656                                          struct name_path *path,
1657                                          const char *name)
1658 {
1659         struct object *obj = &tree->object;
1660         struct tree_desc desc;
1661         struct name_entry entry;
1662         struct name_path me;
1663
1664         obj->flags |= LOCAL;
1665
1666         if (obj->flags & (UNINTERESTING | SEEN))
1667                 return p;
1668         if (parse_tree(tree) < 0)
1669                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1670
1671         obj->flags |= SEEN;
1672         name = xstrdup(name);
1673         p = add_one_object(obj, p);
1674         me.up = path;
1675         me.elem = name;
1676         me.elem_len = strlen(name);
1677
1678         init_tree_desc(&desc, tree->buffer, tree->size);
1679
1680         while (tree_entry(&desc, &entry))
1681                 switch (object_type(entry.mode)) {
1682                 case OBJ_TREE:
1683                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1684                         break;
1685                 case OBJ_BLOB:
1686                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1687                         break;
1688                 default:
1689                         /* Subproject commit - not in this repository */
1690                         break;
1691                 }
1692
1693         free(tree->buffer);
1694         tree->buffer = NULL;
1695         return p;
1696 }
1697
1698 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1699 {
1700         int i;
1701         struct commit *commit;
1702         struct object_list **p = &objects;
1703         int count = 0;
1704
1705         while ((commit = get_revision(revs)) != NULL) {
1706                 p = process_tree(commit->tree, p, NULL, "");
1707                 commit->object.flags |= LOCAL;
1708                 if (!(commit->object.flags & UNINTERESTING))
1709                         count += add_send_request(&commit->object, lock);
1710         }
1711
1712         for (i = 0; i < revs->pending.nr; i++) {
1713                 struct object_array_entry *entry = revs->pending.objects + i;
1714                 struct object *obj = entry->item;
1715                 const char *name = entry->name;
1716
1717                 if (obj->flags & (UNINTERESTING | SEEN))
1718                         continue;
1719                 if (obj->type == OBJ_TAG) {
1720                         obj->flags |= SEEN;
1721                         p = add_one_object(obj, p);
1722                         continue;
1723                 }
1724                 if (obj->type == OBJ_TREE) {
1725                         p = process_tree((struct tree *)obj, p, NULL, name);
1726                         continue;
1727                 }
1728                 if (obj->type == OBJ_BLOB) {
1729                         p = process_blob((struct blob *)obj, p, NULL, name);
1730                         continue;
1731                 }
1732                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1733         }
1734
1735         while (objects) {
1736                 if (!(objects->item->flags & UNINTERESTING))
1737                         count += add_send_request(objects->item, lock);
1738                 objects = objects->next;
1739         }
1740
1741         return count;
1742 }
1743
1744 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1745 {
1746         struct active_request_slot *slot;
1747         struct slot_results results;
1748         struct buffer out_buffer = { STRBUF_INIT, 0 };
1749         struct curl_slist *dav_headers;
1750
1751         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1752
1753         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1754
1755         slot = get_active_slot();
1756         slot->results = &results;
1757         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1758         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1759         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1760         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1761         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1762         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1763         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1764         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1765         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1766
1767         if (start_active_slot(slot)) {
1768                 run_active_slot(slot);
1769                 strbuf_release(&out_buffer.buf);
1770                 if (results.curl_result != CURLE_OK) {
1771                         fprintf(stderr,
1772                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1773                                 results.curl_result, results.http_code);
1774                         /* We should attempt recovery? */
1775                         return 0;
1776                 }
1777         } else {
1778                 strbuf_release(&out_buffer.buf);
1779                 fprintf(stderr, "Unable to start PUT request\n");
1780                 return 0;
1781         }
1782
1783         return 1;
1784 }
1785
1786 static struct ref *local_refs, **local_tail;
1787 static struct ref *remote_refs, **remote_tail;
1788
1789 static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
1790 {
1791         struct ref *ref;
1792         int len = strlen(refname) + 1;
1793         ref = xcalloc(1, sizeof(*ref) + len);
1794         hashcpy(ref->new_sha1, sha1);
1795         memcpy(ref->name, refname, len);
1796         *local_tail = ref;
1797         local_tail = &ref->next;
1798         return 0;
1799 }
1800
1801 static void one_remote_ref(char *refname)
1802 {
1803         struct ref *ref;
1804         struct object *obj;
1805
1806         ref = alloc_ref(refname);
1807
1808         if (http_fetch_ref(remote->url, ref) != 0) {
1809                 fprintf(stderr,
1810                         "Unable to fetch ref %s from %s\n",
1811                         refname, remote->url);
1812                 free(ref);
1813                 return;
1814         }
1815
1816         /*
1817          * Fetch a copy of the object if it doesn't exist locally - it
1818          * may be required for updating server info later.
1819          */
1820         if (remote->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1821                 obj = lookup_unknown_object(ref->old_sha1);
1822                 if (obj) {
1823                         fprintf(stderr, "  fetch %s for %s\n",
1824                                 sha1_to_hex(ref->old_sha1), refname);
1825                         add_fetch_request(obj);
1826                 }
1827         }
1828
1829         *remote_tail = ref;
1830         remote_tail = &ref->next;
1831 }
1832
1833 static void get_local_heads(void)
1834 {
1835         local_tail = &local_refs;
1836         for_each_ref(one_local_ref, NULL);
1837 }
1838
1839 static void get_dav_remote_heads(void)
1840 {
1841         remote_tail = &remote_refs;
1842         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1843 }
1844
1845 static int is_zero_sha1(const unsigned char *sha1)
1846 {
1847         int i;
1848
1849         for (i = 0; i < 20; i++) {
1850                 if (*sha1++)
1851                         return 0;
1852         }
1853         return 1;
1854 }
1855
1856 static void unmark_and_free(struct commit_list *list, unsigned int mark)
1857 {
1858         while (list) {
1859                 struct commit_list *temp = list;
1860                 temp->item->object.flags &= ~mark;
1861                 list = temp->next;
1862                 free(temp);
1863         }
1864 }
1865
1866 static int ref_newer(const unsigned char *new_sha1,
1867                      const unsigned char *old_sha1)
1868 {
1869         struct object *o;
1870         struct commit *old, *new;
1871         struct commit_list *list, *used;
1872         int found = 0;
1873
1874         /* Both new and old must be commit-ish and new is descendant of
1875          * old.  Otherwise we require --force.
1876          */
1877         o = deref_tag(parse_object(old_sha1), NULL, 0);
1878         if (!o || o->type != OBJ_COMMIT)
1879                 return 0;
1880         old = (struct commit *) o;
1881
1882         o = deref_tag(parse_object(new_sha1), NULL, 0);
1883         if (!o || o->type != OBJ_COMMIT)
1884                 return 0;
1885         new = (struct commit *) o;
1886
1887         if (parse_commit(new) < 0)
1888                 return 0;
1889
1890         used = list = NULL;
1891         commit_list_insert(new, &list);
1892         while (list) {
1893                 new = pop_most_recent_commit(&list, TMP_MARK);
1894                 commit_list_insert(new, &used);
1895                 if (new == old) {
1896                         found = 1;
1897                         break;
1898                 }
1899         }
1900         unmark_and_free(list, TMP_MARK);
1901         unmark_and_free(used, TMP_MARK);
1902         return found;
1903 }
1904
1905 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1906 {
1907         struct strbuf *buf = (struct strbuf *)ls->userData;
1908         struct object *o;
1909         int len;
1910         char *ref_info;
1911         struct ref *ref;
1912
1913         ref = alloc_ref(ls->dentry_name);
1914
1915         if (http_fetch_ref(remote->url, ref) != 0) {
1916                 fprintf(stderr,
1917                         "Unable to fetch ref %s from %s\n",
1918                         ls->dentry_name, remote->url);
1919                 aborted = 1;
1920                 free(ref);
1921                 return;
1922         }
1923
1924         o = parse_object(ref->old_sha1);
1925         if (!o) {
1926                 fprintf(stderr,
1927                         "Unable to parse object %s for remote ref %s\n",
1928                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1929                 aborted = 1;
1930                 free(ref);
1931                 return;
1932         }
1933
1934         len = strlen(ls->dentry_name) + 42;
1935         ref_info = xcalloc(len + 1, 1);
1936         sprintf(ref_info, "%s   %s\n",
1937                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1938         fwrite_buffer(ref_info, 1, len, buf);
1939         free(ref_info);
1940
1941         if (o->type == OBJ_TAG) {
1942                 o = deref_tag(o, ls->dentry_name, 0);
1943                 if (o) {
1944                         len = strlen(ls->dentry_name) + 45;
1945                         ref_info = xcalloc(len + 1, 1);
1946                         sprintf(ref_info, "%s   %s^{}\n",
1947                                 sha1_to_hex(o->sha1), ls->dentry_name);
1948                         fwrite_buffer(ref_info, 1, len, buf);
1949                         free(ref_info);
1950                 }
1951         }
1952         free(ref);
1953 }
1954
1955 static void update_remote_info_refs(struct remote_lock *lock)
1956 {
1957         struct buffer buffer = { STRBUF_INIT, 0 };
1958         struct active_request_slot *slot;
1959         struct slot_results results;
1960         struct curl_slist *dav_headers;
1961
1962         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1963                   add_remote_info_ref, &buffer.buf);
1964         if (!aborted) {
1965                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1966
1967                 slot = get_active_slot();
1968                 slot->results = &results;
1969                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1970                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1971                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1972                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1973                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1974                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1975                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1976                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1977                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1978
1979                 if (start_active_slot(slot)) {
1980                         run_active_slot(slot);
1981                         if (results.curl_result != CURLE_OK) {
1982                                 fprintf(stderr,
1983                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1984                                         results.curl_result, results.http_code);
1985                         }
1986                 }
1987         }
1988         strbuf_release(&buffer.buf);
1989 }
1990
1991 static int remote_exists(const char *path)
1992 {
1993         char *url = xmalloc(strlen(remote->url) + strlen(path) + 1);
1994         struct active_request_slot *slot;
1995         struct slot_results results;
1996         int ret = -1;
1997
1998         sprintf(url, "%s%s", remote->url, path);
1999
2000         slot = get_active_slot();
2001         slot->results = &results;
2002         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2003         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2004
2005         if (start_active_slot(slot)) {
2006                 run_active_slot(slot);
2007                 if (results.http_code == 404)
2008                         ret = 0;
2009                 else if (results.curl_result == CURLE_OK)
2010                         ret = 1;
2011                 else
2012                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2013         } else {
2014                 fprintf(stderr, "Unable to start HEAD request\n");
2015         }
2016
2017         free(url);
2018         return ret;
2019 }
2020
2021 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2022 {
2023         char *url;
2024         struct strbuf buffer = STRBUF_INIT;
2025         struct active_request_slot *slot;
2026         struct slot_results results;
2027
2028         url = xmalloc(strlen(remote->url) + strlen(path) + 1);
2029         sprintf(url, "%s%s", remote->url, path);
2030
2031         slot = get_active_slot();
2032         slot->results = &results;
2033         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2034         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2035         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2036         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2037         if (start_active_slot(slot)) {
2038                 run_active_slot(slot);
2039                 if (results.curl_result != CURLE_OK) {
2040                         die("Couldn't get %s for remote symref\n%s",
2041                             url, curl_errorstr);
2042                 }
2043         } else {
2044                 die("Unable to start remote symref request");
2045         }
2046         free(url);
2047
2048         free(*symref);
2049         *symref = NULL;
2050         hashclr(sha1);
2051
2052         if (buffer.len == 0)
2053                 return;
2054
2055         /* If it's a symref, set the refname; otherwise try for a sha1 */
2056         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2057                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2058         } else {
2059                 get_sha1_hex(buffer.buf, sha1);
2060         }
2061
2062         strbuf_release(&buffer);
2063 }
2064
2065 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2066 {
2067         struct commit *head = lookup_commit(head_sha1);
2068         struct commit *branch = lookup_commit(branch_sha1);
2069         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2070
2071         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2072 }
2073
2074 static int delete_remote_branch(char *pattern, int force)
2075 {
2076         struct ref *refs = remote_refs;
2077         struct ref *remote_ref = NULL;
2078         unsigned char head_sha1[20];
2079         char *symref = NULL;
2080         int match;
2081         int patlen = strlen(pattern);
2082         int i;
2083         struct active_request_slot *slot;
2084         struct slot_results results;
2085         char *url;
2086
2087         /* Find the remote branch(es) matching the specified branch name */
2088         for (match = 0; refs; refs = refs->next) {
2089                 char *name = refs->name;
2090                 int namelen = strlen(name);
2091                 if (namelen < patlen ||
2092                     memcmp(name + namelen - patlen, pattern, patlen))
2093                         continue;
2094                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2095                         continue;
2096                 match++;
2097                 remote_ref = refs;
2098         }
2099         if (match == 0)
2100                 return error("No remote branch matches %s", pattern);
2101         if (match != 1)
2102                 return error("More than one remote branch matches %s",
2103                              pattern);
2104
2105         /*
2106          * Remote HEAD must be a symref (not exactly foolproof; a remote
2107          * symlink to a symref will look like a symref)
2108          */
2109         fetch_symref("HEAD", &symref, head_sha1);
2110         if (!symref)
2111                 return error("Remote HEAD is not a symref");
2112
2113         /* Remote branch must not be the remote HEAD */
2114         for (i=0; symref && i<MAXDEPTH; i++) {
2115                 if (!strcmp(remote_ref->name, symref))
2116                         return error("Remote branch %s is the current HEAD",
2117                                      remote_ref->name);
2118                 fetch_symref(symref, &symref, head_sha1);
2119         }
2120
2121         /* Run extra sanity checks if delete is not forced */
2122         if (!force) {
2123                 /* Remote HEAD must resolve to a known object */
2124                 if (symref)
2125                         return error("Remote HEAD symrefs too deep");
2126                 if (is_zero_sha1(head_sha1))
2127                         return error("Unable to resolve remote HEAD");
2128                 if (!has_sha1_file(head_sha1))
2129                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2130
2131                 /* Remote branch must resolve to a known object */
2132                 if (is_zero_sha1(remote_ref->old_sha1))
2133                         return error("Unable to resolve remote branch %s",
2134                                      remote_ref->name);
2135                 if (!has_sha1_file(remote_ref->old_sha1))
2136                         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));
2137
2138                 /* Remote branch must be an ancestor of remote HEAD */
2139                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2140                         return error("The branch '%s' is not an ancestor "
2141                                      "of your current HEAD.\n"
2142                                      "If you are sure you want to delete it,"
2143                                      " run:\n\t'git http-push -D %s %s'",
2144                                      remote_ref->name, remote->url, pattern);
2145                 }
2146         }
2147
2148         /* Send delete request */
2149         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2150         if (dry_run)
2151                 return 0;
2152         url = xmalloc(strlen(remote->url) + strlen(remote_ref->name) + 1);
2153         sprintf(url, "%s%s", remote->url, remote_ref->name);
2154         slot = get_active_slot();
2155         slot->results = &results;
2156         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2157         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2158         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2159         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2160         if (start_active_slot(slot)) {
2161                 run_active_slot(slot);
2162                 free(url);
2163                 if (results.curl_result != CURLE_OK)
2164                         return error("DELETE request failed (%d/%ld)\n",
2165                                      results.curl_result, results.http_code);
2166         } else {
2167                 free(url);
2168                 return error("Unable to start DELETE request");
2169         }
2170
2171         return 0;
2172 }
2173
2174 int main(int argc, char **argv)
2175 {
2176         struct transfer_request *request;
2177         struct transfer_request *next_request;
2178         int nr_refspec = 0;
2179         char **refspec = NULL;
2180         struct remote_lock *ref_lock = NULL;
2181         struct remote_lock *info_ref_lock = NULL;
2182         struct rev_info revs;
2183         int delete_branch = 0;
2184         int force_delete = 0;
2185         int objects_to_send;
2186         int rc = 0;
2187         int i;
2188         int new_refs;
2189         struct ref *ref;
2190         char *rewritten_url = NULL;
2191
2192         git_extract_argv0_path(argv[0]);
2193
2194         setup_git_directory();
2195
2196         remote = xcalloc(sizeof(*remote), 1);
2197
2198         argv++;
2199         for (i = 1; i < argc; i++, argv++) {
2200                 char *arg = *argv;
2201
2202                 if (*arg == '-') {
2203                         if (!strcmp(arg, "--all")) {
2204                                 push_all = MATCH_REFS_ALL;
2205                                 continue;
2206                         }
2207                         if (!strcmp(arg, "--force")) {
2208                                 force_all = 1;
2209                                 continue;
2210                         }
2211                         if (!strcmp(arg, "--dry-run")) {
2212                                 dry_run = 1;
2213                                 continue;
2214                         }
2215                         if (!strcmp(arg, "--verbose")) {
2216                                 push_verbosely = 1;
2217                                 continue;
2218                         }
2219                         if (!strcmp(arg, "-d")) {
2220                                 delete_branch = 1;
2221                                 continue;
2222                         }
2223                         if (!strcmp(arg, "-D")) {
2224                                 delete_branch = 1;
2225                                 force_delete = 1;
2226                                 continue;
2227                         }
2228                 }
2229                 if (!remote->url) {
2230                         char *path = strstr(arg, "//");
2231                         remote->url = arg;
2232                         remote->path_len = strlen(arg);
2233                         if (path) {
2234                                 remote->path = strchr(path+2, '/');
2235                                 if (remote->path)
2236                                         remote->path_len = strlen(remote->path);
2237                         }
2238                         continue;
2239                 }
2240                 refspec = argv;
2241                 nr_refspec = argc - i;
2242                 break;
2243         }
2244
2245 #ifndef USE_CURL_MULTI
2246         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2247 #endif
2248
2249         if (!remote->url)
2250                 usage(http_push_usage);
2251
2252         if (delete_branch && nr_refspec != 1)
2253                 die("You must specify only one branch name when deleting a remote branch");
2254
2255         memset(remote_dir_exists, -1, 256);
2256
2257         http_init(NULL);
2258
2259         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2260
2261         if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
2262                 rewritten_url = xmalloc(strlen(remote->url)+2);
2263                 strcpy(rewritten_url, remote->url);
2264                 strcat(rewritten_url, "/");
2265                 remote->path = rewritten_url + (remote->path - remote->url);
2266                 remote->path_len++;
2267                 remote->url = rewritten_url;
2268         }
2269
2270         /* Verify DAV compliance/lock support */
2271         if (!locking_available()) {
2272                 rc = 1;
2273                 goto cleanup;
2274         }
2275
2276         sigchain_push_common(remove_locks_on_signal);
2277
2278         /* Check whether the remote has server info files */
2279         remote->can_update_info_refs = 0;
2280         remote->has_info_refs = remote_exists("info/refs");
2281         remote->has_info_packs = remote_exists("objects/info/packs");
2282         if (remote->has_info_refs) {
2283                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2284                 if (info_ref_lock)
2285                         remote->can_update_info_refs = 1;
2286                 else {
2287                         fprintf(stderr, "Error: cannot lock existing info/refs\n");
2288                         rc = 1;
2289                         goto cleanup;
2290                 }
2291         }
2292         if (remote->has_info_packs)
2293                 fetch_indices();
2294
2295         /* Get a list of all local and remote heads to validate refspecs */
2296         get_local_heads();
2297         fprintf(stderr, "Fetching remote heads...\n");
2298         get_dav_remote_heads();
2299
2300         /* Remove a remote branch if -d or -D was specified */
2301         if (delete_branch) {
2302                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2303                         fprintf(stderr, "Unable to delete remote branch %s\n",
2304                                 refspec[0]);
2305                 goto cleanup;
2306         }
2307
2308         /* match them up */
2309         if (!remote_tail)
2310                 remote_tail = &remote_refs;
2311         if (match_refs(local_refs, remote_refs, &remote_tail,
2312                        nr_refspec, (const char **) refspec, push_all)) {
2313                 rc = -1;
2314                 goto cleanup;
2315         }
2316         if (!remote_refs) {
2317                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2318                 rc = 0;
2319                 goto cleanup;
2320         }
2321
2322         new_refs = 0;
2323         for (ref = remote_refs; ref; ref = ref->next) {
2324                 char old_hex[60], *new_hex;
2325                 const char *commit_argv[4];
2326                 int commit_argc;
2327                 char *new_sha1_hex, *old_sha1_hex;
2328
2329                 if (!ref->peer_ref)
2330                         continue;
2331
2332                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2333                         if (delete_remote_branch(ref->name, 1) == -1) {
2334                                 error("Could not remove %s", ref->name);
2335                                 rc = -4;
2336                         }
2337                         new_refs++;
2338                         continue;
2339                 }
2340
2341                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2342                         if (push_verbosely || 1)
2343                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2344                         continue;
2345                 }
2346
2347                 if (!force_all &&
2348                     !is_zero_sha1(ref->old_sha1) &&
2349                     !ref->force) {
2350                         if (!has_sha1_file(ref->old_sha1) ||
2351                             !ref_newer(ref->peer_ref->new_sha1,
2352                                        ref->old_sha1)) {
2353                                 /*
2354                                  * We do not have the remote ref, or
2355                                  * we know that the remote ref is not
2356                                  * an ancestor of what we are trying to
2357                                  * push.  Either way this can be losing
2358                                  * commits at the remote end and likely
2359                                  * we were not up to date to begin with.
2360                                  */
2361                                 error("remote '%s' is not an ancestor of\n"
2362                                       "local '%s'.\n"
2363                                       "Maybe you are not up-to-date and "
2364                                       "need to pull first?",
2365                                       ref->name,
2366                                       ref->peer_ref->name);
2367                                 rc = -2;
2368                                 continue;
2369                         }
2370                 }
2371                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2372                 new_refs++;
2373                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2374                 new_hex = sha1_to_hex(ref->new_sha1);
2375
2376                 fprintf(stderr, "updating '%s'", ref->name);
2377                 if (strcmp(ref->name, ref->peer_ref->name))
2378                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2379                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2380                 if (dry_run)
2381                         continue;
2382
2383                 /* Lock remote branch ref */
2384                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2385                 if (ref_lock == NULL) {
2386                         fprintf(stderr, "Unable to lock remote branch %s\n",
2387                                 ref->name);
2388                         rc = 1;
2389                         continue;
2390                 }
2391
2392                 /* Set up revision info for this refspec */
2393                 commit_argc = 3;
2394                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2395                 old_sha1_hex = NULL;
2396                 commit_argv[1] = "--objects";
2397                 commit_argv[2] = new_sha1_hex;
2398                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2399                         old_sha1_hex = xmalloc(42);
2400                         sprintf(old_sha1_hex, "^%s",
2401                                 sha1_to_hex(ref->old_sha1));
2402                         commit_argv[3] = old_sha1_hex;
2403                         commit_argc++;
2404                 }
2405                 init_revisions(&revs, setup_git_directory());
2406                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2407                 revs.edge_hint = 0; /* just in case */
2408                 free(new_sha1_hex);
2409                 if (old_sha1_hex) {
2410                         free(old_sha1_hex);
2411                         commit_argv[1] = NULL;
2412                 }
2413
2414                 /* Generate a list of objects that need to be pushed */
2415                 pushing = 0;
2416                 if (prepare_revision_walk(&revs))
2417                         die("revision walk setup failed");
2418                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2419                 objects_to_send = get_delta(&revs, ref_lock);
2420                 finish_all_active_slots();
2421
2422                 /* Push missing objects to remote, this would be a
2423                    convenient time to pack them first if appropriate. */
2424                 pushing = 1;
2425                 if (objects_to_send)
2426                         fprintf(stderr, "    sending %d objects\n",
2427                                 objects_to_send);
2428 #ifdef USE_CURL_MULTI
2429                 fill_active_slots();
2430                 add_fill_function(NULL, fill_active_slot);
2431 #endif
2432                 do {
2433                         finish_all_active_slots();
2434 #ifdef USE_CURL_MULTI
2435                         fill_active_slots();
2436 #endif
2437                 } while (request_queue_head && !aborted);
2438
2439                 /* Update the remote branch if all went well */
2440                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2441                         rc = 1;
2442
2443                 if (!rc)
2444                         fprintf(stderr, "    done\n");
2445                 unlock_remote(ref_lock);
2446                 check_locks();
2447         }
2448
2449         /* Update remote server info if appropriate */
2450         if (remote->has_info_refs && new_refs) {
2451                 if (info_ref_lock && remote->can_update_info_refs) {
2452                         fprintf(stderr, "Updating remote server info\n");
2453                         if (!dry_run)
2454                                 update_remote_info_refs(info_ref_lock);
2455                 } else {
2456                         fprintf(stderr, "Unable to update server info\n");
2457                 }
2458         }
2459
2460  cleanup:
2461         free(rewritten_url);
2462         if (info_ref_lock)
2463                 unlock_remote(info_ref_lock);
2464         free(remote);
2465
2466         curl_slist_free_all(no_pragma_header);
2467
2468         http_cleanup();
2469
2470         request = request_queue_head;
2471         while (request != NULL) {
2472                 next_request = request->next;
2473                 release_request(request);
2474                 request = next_request;
2475         }
2476
2477         return rc;
2478 }