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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "tag.h"
   4 #include "blob.h"
   5 #include "http.h"
   6 #include "refs.h"
   7 #include "diff.h"
   8 #include "revision.h"
   9 #include "exec_cmd.h"
  10 #include "remote.h"
  11 #include "list-objects.h"
  12 #include "sigchain.h"
  13
  14 #include <expat.h>
  15
  16 static const char http_push_usage[] =
  17 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  18
  19 #ifndef XML_STATUS_OK
  20 enum XML_Status {
  21   XML_STATUS_OK = 1,
  22   XML_STATUS_ERROR = 0
  23 };
  24 #define XML_STATUS_OK    1
  25 #define XML_STATUS_ERROR 0
  26 #endif
  27
  28 #define PREV_BUF_SIZE 4096
  29
  30 /* DAV methods */
  31 #define DAV_LOCK "LOCK"
  32 #define DAV_MKCOL "MKCOL"
  33 #define DAV_MOVE "MOVE"
  34 #define DAV_PROPFIND "PROPFIND"
  35 #define DAV_PUT "PUT"
  36 #define DAV_UNLOCK "UNLOCK"
  37 #define DAV_DELETE "DELETE"
  38
  39 /* DAV lock flags */
  40 #define DAV_PROP_LOCKWR (1u << 0)
  41 #define DAV_PROP_LOCKEX (1u << 1)
  42 #define DAV_LOCK_OK (1u << 2)
  43
  44 /* DAV XML properties */
  45 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  46 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  47 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  48 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  49 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  50 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  51 #define DAV_PROPFIND_RESP ".multistatus.response"
  52 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  53 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  54
  55 /* DAV request body templates */
  56 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  57 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  58 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  59
  60 #define LOCK_TIME 600
  61 #define LOCK_REFRESH 30
  62
  63 /* bits #0-15 in revision.h */
  64
  65 #define LOCAL    (1u<<16)
  66 #define REMOTE   (1u<<17)
  67 #define FETCHING (1u<<18)
  68 #define PUSHING  (1u<<19)
  69
  70 /* We allow "recursive" symbolic refs. Only within reason, though */
  71 #define MAXDEPTH 5
  72
  73 static int pushing;
  74 static int aborted;
  75 static signed char remote_dir_exists[256];
  76
  77 static int push_verbosely;
  78 static int push_all = MATCH_REFS_NONE;
  79 static int force_all;
  80 static int dry_run;
  81
  82 static struct object_list *objects;
  83
  84 struct repo
  85 {
  86         char *url;
  87         char *path;
  88         int path_len;
  89         int has_info_refs;
  90         int can_update_info_refs;
  91         int has_info_packs;
  92         struct packed_git *packs;
  93         struct remote_lock *locks;
  94 };
  95
  96 static struct repo *repo;
  97
  98 enum transfer_state {
  99         NEED_FETCH,
 100         RUN_FETCH_LOOSE,
 101         RUN_FETCH_PACKED,
 102         NEED_PUSH,
 103         RUN_MKCOL,
 104         RUN_PUT,
 105         RUN_MOVE,
 106         ABORTED,
 107         COMPLETE,
 108 };
 109
 110 struct transfer_request
 111 {
 112         struct object *obj;
 113         char *url;
 114         char *dest;
 115         struct remote_lock *lock;
 116         struct curl_slist *headers;
 117         struct buffer buffer;
 118         char filename[PATH_MAX];
 119         char tmpfile[PATH_MAX];
 120         int local_fileno;
 121         enum transfer_state state;
 122         CURLcode curl_result;
 123         char errorstr[CURL_ERROR_SIZE];
 124         long http_code;
 125         unsigned char real_sha1[20];
 126         git_SHA_CTX c;
 127         z_stream stream;
 128         int zret;
 129         int rename;
 130         void *userData;
 131         struct active_request_slot *slot;
 132         struct transfer_request *next;
 133 };
 134
 135 static struct transfer_request *request_queue_head;
 136
 137 struct xml_ctx
 138 {
 139         char *name;
 140         int len;
 141         char *cdata;
 142         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 143         void *userData;
 144 };
 145
 146 struct remote_lock
 147 {
 148         char *url;
 149         char *owner;
 150         char *token;
 151         char tmpfile_suffix[41];
 152         time_t start_time;
 153         long timeout;
 154         int refreshing;
 155         struct remote_lock *next;
 156 };
 157
 158 /* Flags that control remote_ls processing */
 159 #define PROCESS_FILES (1u << 0)
 160 #define PROCESS_DIRS  (1u << 1)
 161 #define RECURSIVE     (1u << 2)
 162
 163 /* Flags that remote_ls passes to callback functions */
 164 #define IS_DIR (1u << 0)
 165
 166 struct remote_ls_ctx
 167 {
 168         char *path;
 169         void (*userFunc)(struct remote_ls_ctx *ls);
 170         void *userData;
 171         int flags;
 172         char *dentry_name;
 173         int dentry_flags;
 174         struct remote_ls_ctx *parent;
 175 };
 176
 177 /* get_dav_token_headers options */
 178 enum dav_header_flag {
 179         DAV_HEADER_IF = (1u << 0),
 180         DAV_HEADER_LOCK = (1u << 1),
 181         DAV_HEADER_TIMEOUT = (1u << 2)
 182 };
 183
 184 static char *xml_entities(char *s)
 185 {
 186         struct strbuf buf = STRBUF_INIT;
 187         while (*s) {
 188                 size_t len = strcspn(s, "\"<>&");
 189                 strbuf_add(&buf, s, len);
 190                 s += len;
 191                 switch (*s) {
 192                 case '"':
 193                         strbuf_addstr(&buf, "&quot;");
 194                         break;
 195                 case '<':
 196                         strbuf_addstr(&buf, "&lt;");
 197                         break;
 198                 case '>':
 199                         strbuf_addstr(&buf, "&gt;");
 200                         break;
 201                 case '&':
 202                         strbuf_addstr(&buf, "&amp;");
 203                         break;
 204                 }
 205                 s++;
 206         }
 207         return strbuf_detach(&buf, NULL);
 208 }
 209
 210 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 211 {
 212         struct strbuf buf = STRBUF_INIT;
 213         struct curl_slist *dav_headers = NULL;
 214
 215         if (options & DAV_HEADER_IF) {
 216                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 217                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 218                 strbuf_reset(&buf);
 219         }
 220         if (options & DAV_HEADER_LOCK) {
 221                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                 strbuf_reset(&buf);
 224         }
 225         if (options & DAV_HEADER_TIMEOUT) {
 226                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 227                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 228                 strbuf_reset(&buf);
 229         }
 230         strbuf_release(&buf);
 231
 232         return dav_headers;
 233 }
 234
 235 static void append_remote_object_url(struct strbuf *buf, const char *url,
 236                                      const char *hex,
 237                                      int only_two_digit_prefix)
 238 {
 239         strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 240         if (!only_two_digit_prefix)
 241                 strbuf_addf(buf, "%s", hex+2);
 242 }
 243
 244 static void finish_request(struct transfer_request *request);
 245 static void release_request(struct transfer_request *request);
 246
 247 static void process_response(void *callback_data)
 248 {
 249         struct transfer_request *request =
 250                 (struct transfer_request *)callback_data;
 251
 252         finish_request(request);
 253 }
 254
 255 #ifdef USE_CURL_MULTI
 256
 257 static char *get_remote_object_url(const char *url, const char *hex,
 258                                    int only_two_digit_prefix)
 259 {
 260         struct strbuf buf = STRBUF_INIT;
 261         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 262         return strbuf_detach(&buf, NULL);
 263 }
 264
 265 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 266                                void *data)
 267 {
 268         unsigned char expn[4096];
 269         size_t size = eltsize * nmemb;
 270         int posn = 0;
 271         struct transfer_request *request = (struct transfer_request *)data;
 272         do {
 273                 ssize_t retval = xwrite(request->local_fileno,
 274                                         (char *) ptr + posn, size - posn);
 275                 if (retval < 0)
 276                         return posn;
 277                 posn += retval;
 278         } while (posn < size);
 279
 280         request->stream.avail_in = size;
 281         request->stream.next_in = ptr;
 282         do {
 283                 request->stream.next_out = expn;
 284                 request->stream.avail_out = sizeof(expn);
 285                 request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 286                 git_SHA1_Update(&request->c, expn,
 287                                 sizeof(expn) - request->stream.avail_out);
 288         } while (request->stream.avail_in && request->zret == Z_OK);
 289         data_received++;
 290         return size;
 291 }
 292
 293 static void start_fetch_loose(struct transfer_request *request)
 294 {
 295         char *hex = sha1_to_hex(request->obj->sha1);
 296         char *filename;
 297         char prevfile[PATH_MAX];
 298         char *url;
 299         int prevlocal;
 300         unsigned char prev_buf[PREV_BUF_SIZE];
 301         ssize_t prev_read = 0;
 302         long prev_posn = 0;
 303         char range[RANGE_HEADER_SIZE];
 304         struct curl_slist *range_header = NULL;
 305         struct active_request_slot *slot;
 306
 307         filename = sha1_file_name(request->obj->sha1);
 308         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 309         snprintf(request->tmpfile, sizeof(request->tmpfile),
 310                  "%s.temp", filename);
 311
 312         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 313         unlink_or_warn(prevfile);
 314         rename(request->tmpfile, prevfile);
 315         unlink_or_warn(request->tmpfile);
 316
 317         if (request->local_fileno != -1)
 318                 error("fd leakage in start: %d", request->local_fileno);
 319         request->local_fileno = open(request->tmpfile,
 320                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 321         /*
 322          * This could have failed due to the "lazy directory creation";
 323          * try to mkdir the last path component.
 324          */
 325         if (request->local_fileno < 0 && errno == ENOENT) {
 326                 char *dir = strrchr(request->tmpfile, '/');
 327                 if (dir) {
 328                         *dir = 0;
 329                         mkdir(request->tmpfile, 0777);
 330                         *dir = '/';
 331                 }
 332                 request->local_fileno = open(request->tmpfile,
 333                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 334         }
 335
 336         if (request->local_fileno < 0) {
 337                 request->state = ABORTED;
 338                 error("Couldn't create temporary file %s for %s: %s",
 339                       request->tmpfile, request->filename, strerror(errno));
 340                 return;
 341         }
 342
 343         memset(&request->stream, 0, sizeof(request->stream));
 344
 345         git_inflate_init(&request->stream);
 346
 347         git_SHA1_Init(&request->c);
 348
 349         url = get_remote_object_url(repo->url, hex, 0);
 350         request->url = xstrdup(url);
 351
 352         /*
 353          * If a previous temp file is present, process what was already
 354          * fetched.
 355          */
 356         prevlocal = open(prevfile, O_RDONLY);
 357         if (prevlocal != -1) {
 358                 do {
 359                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 360                         if (prev_read>0) {
 361                                 if (fwrite_sha1_file(prev_buf,
 362                                                      1,
 363                                                      prev_read,
 364                                                      request) == prev_read)
 365                                         prev_posn += prev_read;
 366                                 else
 367                                         prev_read = -1;
 368                         }
 369                 } while (prev_read > 0);
 370                 close(prevlocal);
 371         }
 372         unlink_or_warn(prevfile);
 373
 374         /*
 375          * Reset inflate/SHA1 if there was an error reading the previous temp
 376          * file; also rewind to the beginning of the local file.
 377          */
 378         if (prev_read == -1) {
 379                 memset(&request->stream, 0, sizeof(request->stream));
 380                 git_inflate_init(&request->stream);
 381                 git_SHA1_Init(&request->c);
 382                 if (prev_posn>0) {
 383                         prev_posn = 0;
 384                         lseek(request->local_fileno, 0, SEEK_SET);
 385                         ftruncate(request->local_fileno, 0);
 386                 }
 387         }
 388
 389         slot = get_active_slot();
 390         slot->callback_func = process_response;
 391         slot->callback_data = request;
 392         request->slot = slot;
 393
 394         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 395         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 396         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 397         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 398         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 399
 400         /*
 401          * If we have successfully processed data from a previous fetch
 402          * attempt, only fetch the data we don't already have.
 403          */
 404         if (prev_posn>0) {
 405                 if (push_verbosely)
 406                         fprintf(stderr,
 407                                 "Resuming fetch of object %s at byte %ld\n",
 408                                 hex, prev_posn);
 409                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 410                 range_header = curl_slist_append(range_header, range);
 411                 curl_easy_setopt(slot->curl,
 412                                  CURLOPT_HTTPHEADER, range_header);
 413         }
 414
 415         /* Try to get the request started, abort the request on error */
 416         request->state = RUN_FETCH_LOOSE;
 417         if (!start_active_slot(slot)) {
 418                 fprintf(stderr, "Unable to start GET request\n");
 419                 repo->can_update_info_refs = 0;
 420                 release_request(request);
 421         }
 422 }
 423
 424 static void start_mkcol(struct transfer_request *request)
 425 {
 426         char *hex = sha1_to_hex(request->obj->sha1);
 427         struct active_request_slot *slot;
 428
 429         request->url = get_remote_object_url(repo->url, hex, 1);
 430
 431         slot = get_active_slot();
 432         slot->callback_func = process_response;
 433         slot->callback_data = request;
 434         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 435         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 436         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 437         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 438         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 439
 440         if (start_active_slot(slot)) {
 441                 request->slot = slot;
 442                 request->state = RUN_MKCOL;
 443         } else {
 444                 request->state = ABORTED;
 445                 free(request->url);
 446                 request->url = NULL;
 447         }
 448 }
 449 #endif
 450
 451 static void start_fetch_packed(struct transfer_request *request)
 452 {
 453         struct packed_git *target;
 454
 455         struct transfer_request *check_request = request_queue_head;
 456         struct http_pack_request *preq;
 457
 458         target = find_sha1_pack(request->obj->sha1, repo->packs);
 459         if (!target) {
 460                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 461                 repo->can_update_info_refs = 0;
 462                 release_request(request);
 463                 return;
 464         }
 465
 466         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 467         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 468
 469         preq = new_http_pack_request(target, repo->url);
 470         if (preq == NULL) {
 471                 release_http_pack_request(preq);
 472                 repo->can_update_info_refs = 0;
 473                 return;
 474         }
 475         preq->lst = &repo->packs;
 476
 477         /* Make sure there isn't another open request for this pack */
 478         while (check_request) {
 479                 if (check_request->state == RUN_FETCH_PACKED &&
 480                     !strcmp(check_request->url, preq->url)) {
 481                         release_http_pack_request(preq);
 482                         release_request(request);
 483                         return;
 484                 }
 485                 check_request = check_request->next;
 486         }
 487
 488         preq->slot->callback_func = process_response;
 489         preq->slot->callback_data = request;
 490         request->slot = preq->slot;
 491         request->userData = preq;
 492
 493         /* Try to get the request started, abort the request on error */
 494         request->state = RUN_FETCH_PACKED;
 495         if (!start_active_slot(preq->slot)) {
 496                 fprintf(stderr, "Unable to start GET request\n");
 497                 release_http_pack_request(preq);
 498                 repo->can_update_info_refs = 0;
 499                 release_request(request);
 500         }
 501 }
 502
 503 static void start_put(struct transfer_request *request)
 504 {
 505         char *hex = sha1_to_hex(request->obj->sha1);
 506         struct active_request_slot *slot;
 507         struct strbuf buf = STRBUF_INIT;
 508         enum object_type type;
 509         char hdr[50];
 510         void *unpacked;
 511         unsigned long len;
 512         int hdrlen;
 513         ssize_t size;
 514         z_stream stream;
 515
 516         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 517         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 518
 519         /* Set it up */
 520         memset(&stream, 0, sizeof(stream));
 521         deflateInit(&stream, zlib_compression_level);
 522         size = deflateBound(&stream, len + hdrlen);
 523         strbuf_init(&request->buffer.buf, size);
 524         request->buffer.posn = 0;
 525
 526         /* Compress it */
 527         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 528         stream.avail_out = size;
 529
 530         /* First header.. */
 531         stream.next_in = (void *)hdr;
 532         stream.avail_in = hdrlen;
 533         while (deflate(&stream, 0) == Z_OK)
 534                 /* nothing */;
 535
 536         /* Then the data itself.. */
 537         stream.next_in = unpacked;
 538         stream.avail_in = len;
 539         while (deflate(&stream, Z_FINISH) == Z_OK)
 540                 /* nothing */;
 541         deflateEnd(&stream);
 542         free(unpacked);
 543
 544         request->buffer.buf.len = stream.total_out;
 545
 546         strbuf_addstr(&buf, "Destination: ");
 547         append_remote_object_url(&buf, repo->url, hex, 0);
 548         request->dest = strbuf_detach(&buf, NULL);
 549
 550         append_remote_object_url(&buf, repo->url, hex, 0);
 551         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 552         request->url = strbuf_detach(&buf, NULL);
 553
 554         slot = get_active_slot();
 555         slot->callback_func = process_response;
 556         slot->callback_data = request;
 557         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 558         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 559         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 560 #ifndef NO_CURL_IOCTL
 561         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 562         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 563 #endif
 564         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 565         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 566         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 567         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 568         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 569         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 570
 571         if (start_active_slot(slot)) {
 572                 request->slot = slot;
 573                 request->state = RUN_PUT;
 574         } else {
 575                 request->state = ABORTED;
 576                 free(request->url);
 577                 request->url = NULL;
 578         }
 579 }
 580
 581 static void start_move(struct transfer_request *request)
 582 {
 583         struct active_request_slot *slot;
 584         struct curl_slist *dav_headers = NULL;
 585
 586         slot = get_active_slot();
 587         slot->callback_func = process_response;
 588         slot->callback_data = request;
 589         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 590         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 591         dav_headers = curl_slist_append(dav_headers, request->dest);
 592         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 593         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 594         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 595         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 596
 597         if (start_active_slot(slot)) {
 598                 request->slot = slot;
 599                 request->state = RUN_MOVE;
 600         } else {
 601                 request->state = ABORTED;
 602                 free(request->url);
 603                 request->url = NULL;
 604         }
 605 }
 606
 607 static int refresh_lock(struct remote_lock *lock)
 608 {
 609         struct active_request_slot *slot;
 610         struct slot_results results;
 611         struct curl_slist *dav_headers;
 612         int rc = 0;
 613
 614         lock->refreshing = 1;
 615
 616         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 617
 618         slot = get_active_slot();
 619         slot->results = &results;
 620         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 621         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 622         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 623         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 624         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 625
 626         if (start_active_slot(slot)) {
 627                 run_active_slot(slot);
 628                 if (results.curl_result != CURLE_OK) {
 629                         fprintf(stderr, "LOCK HTTP error %ld\n",
 630                                 results.http_code);
 631                 } else {
 632                         lock->start_time = time(NULL);
 633                         rc = 1;
 634                 }
 635         }
 636
 637         lock->refreshing = 0;
 638         curl_slist_free_all(dav_headers);
 639
 640         return rc;
 641 }
 642
 643 static void check_locks(void)
 644 {
 645         struct remote_lock *lock = repo->locks;
 646         time_t current_time = time(NULL);
 647         int time_remaining;
 648
 649         while (lock) {
 650                 time_remaining = lock->start_time + lock->timeout -
 651                         current_time;
 652                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 653                         if (!refresh_lock(lock)) {
 654                                 fprintf(stderr,
 655                                         "Unable to refresh lock for %s\n",
 656                                         lock->url);
 657                                 aborted = 1;
 658                                 return;
 659                         }
 660                 }
 661                 lock = lock->next;
 662         }
 663 }
 664
 665 static void release_request(struct transfer_request *request)
 666 {
 667         struct transfer_request *entry = request_queue_head;
 668
 669         if (request == request_queue_head) {
 670                 request_queue_head = request->next;
 671         } else {
 672                 while (entry->next != NULL && entry->next != request)
 673                         entry = entry->next;
 674                 if (entry->next == request)
 675                         entry->next = entry->next->next;
 676         }
 677
 678         if (request->local_fileno != -1)
 679                 close(request->local_fileno);
 680         free(request->url);
 681         free(request);
 682 }
 683
 684 static void finish_request(struct transfer_request *request)
 685 {
 686         struct stat st;
 687         struct http_pack_request *preq;
 688
 689         request->curl_result = request->slot->curl_result;
 690         request->http_code = request->slot->http_code;
 691         request->slot = NULL;
 692
 693         /* Keep locks active */
 694         check_locks();
 695
 696         if (request->headers != NULL)
 697                 curl_slist_free_all(request->headers);
 698
 699         /* URL is reused for MOVE after PUT */
 700         if (request->state != RUN_PUT) {
 701                 free(request->url);
 702                 request->url = NULL;
 703         }
 704
 705         if (request->state == RUN_MKCOL) {
 706                 if (request->curl_result == CURLE_OK ||
 707                     request->http_code == 405) {
 708                         remote_dir_exists[request->obj->sha1[0]] = 1;
 709                         start_put(request);
 710                 } else {
 711                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 712                                 sha1_to_hex(request->obj->sha1),
 713                                 request->curl_result, request->http_code);
 714                         request->state = ABORTED;
 715                         aborted = 1;
 716                 }
 717         } else if (request->state == RUN_PUT) {
 718                 if (request->curl_result == CURLE_OK) {
 719                         start_move(request);
 720                 } else {
 721                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 722                                 sha1_to_hex(request->obj->sha1),
 723                                 request->curl_result, request->http_code);
 724                         request->state = ABORTED;
 725                         aborted = 1;
 726                 }
 727         } else if (request->state == RUN_MOVE) {
 728                 if (request->curl_result == CURLE_OK) {
 729                         if (push_verbosely)
 730                                 fprintf(stderr, "    sent %s\n",
 731                                         sha1_to_hex(request->obj->sha1));
 732                         request->obj->flags |= REMOTE;
 733                         release_request(request);
 734                 } else {
 735                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 736                                 sha1_to_hex(request->obj->sha1),
 737                                 request->curl_result, request->http_code);
 738                         request->state = ABORTED;
 739                         aborted = 1;
 740                 }
 741         } else if (request->state == RUN_FETCH_LOOSE) {
 742                 close(request->local_fileno);
 743                 request->local_fileno = -1;
 744
 745                 if (request->curl_result != CURLE_OK &&
 746                     request->http_code != 416) {
 747                         if (stat(request->tmpfile, &st) == 0) {
 748                                 if (st.st_size == 0)
 749                                         unlink_or_warn(request->tmpfile);
 750                         }
 751                 } else {
 752                         if (request->http_code == 416)
 753                                 warning("requested range invalid; we may already have all the data.");
 754
 755                         git_inflate_end(&request->stream);
 756                         git_SHA1_Final(request->real_sha1, &request->c);
 757                         if (request->zret != Z_STREAM_END) {
 758                                 unlink_or_warn(request->tmpfile);
 759                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 760                                 unlink_or_warn(request->tmpfile);
 761                         } else {
 762                                 request->rename =
 763                                         move_temp_to_file(
 764                                                 request->tmpfile,
 765                                                 request->filename);
 766                                 if (request->rename == 0)
 767                                         request->obj->flags |= (LOCAL | REMOTE);
 768                         }
 769                 }
 770
 771                 /* Try fetching packed if necessary */
 772                 if (request->obj->flags & LOCAL)
 773                         release_request(request);
 774                 else
 775                         start_fetch_packed(request);
 776
 777         } else if (request->state == RUN_FETCH_PACKED) {
 778                 int fail = 1;
 779                 if (request->curl_result != CURLE_OK) {
 780                         fprintf(stderr, "Unable to get pack file %s\n%s",
 781                                 request->url, curl_errorstr);
 782                 } else {
 783                         preq = (struct http_pack_request *)request->userData;
 784
 785                         if (preq) {
 786                                 if (finish_http_pack_request(preq) > 0)
 787                                         fail = 0;
 788                                 release_http_pack_request(preq);
 789                         }
 790                 }
 791                 if (fail)
 792                         repo->can_update_info_refs = 0;
 793                 release_request(request);
 794         }
 795 }
 796
 797 #ifdef USE_CURL_MULTI
 798 static int is_running_queue;
 799 static int fill_active_slot(void *unused)
 800 {
 801         struct transfer_request *request;
 802
 803         if (aborted || !is_running_queue)
 804                 return 0;
 805
 806         for (request = request_queue_head; request; request = request->next) {
 807                 if (request->state == NEED_FETCH) {
 808                         start_fetch_loose(request);
 809                         return 1;
 810                 } else if (pushing && request->state == NEED_PUSH) {
 811                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 812                                 start_put(request);
 813                         } else {
 814                                 start_mkcol(request);
 815                         }
 816                         return 1;
 817                 }
 818         }
 819         return 0;
 820 }
 821 #endif
 822
 823 static void get_remote_object_list(unsigned char parent);
 824
 825 static void add_fetch_request(struct object *obj)
 826 {
 827         struct transfer_request *request;
 828
 829         check_locks();
 830
 831         /*
 832          * Don't fetch the object if it's known to exist locally
 833          * or is already in the request queue
 834          */
 835         if (remote_dir_exists[obj->sha1[0]] == -1)
 836                 get_remote_object_list(obj->sha1[0]);
 837         if (obj->flags & (LOCAL | FETCHING))
 838                 return;
 839
 840         obj->flags |= FETCHING;
 841         request = xmalloc(sizeof(*request));
 842         request->obj = obj;
 843         request->url = NULL;
 844         request->lock = NULL;
 845         request->headers = NULL;
 846         request->local_fileno = -1;
 847         request->state = NEED_FETCH;
 848         request->next = request_queue_head;
 849         request_queue_head = request;
 850
 851 #ifdef USE_CURL_MULTI
 852         fill_active_slots();
 853         step_active_slots();
 854 #endif
 855 }
 856
 857 static int add_send_request(struct object *obj, struct remote_lock *lock)
 858 {
 859         struct transfer_request *request = request_queue_head;
 860         struct packed_git *target;
 861
 862         /* Keep locks active */
 863         check_locks();
 864
 865         /*
 866          * Don't push the object if it's known to exist on the remote
 867          * or is already in the request queue
 868          */
 869         if (remote_dir_exists[obj->sha1[0]] == -1)
 870                 get_remote_object_list(obj->sha1[0]);
 871         if (obj->flags & (REMOTE | PUSHING))
 872                 return 0;
 873         target = find_sha1_pack(obj->sha1, repo->packs);
 874         if (target) {
 875                 obj->flags |= REMOTE;
 876                 return 0;
 877         }
 878
 879         obj->flags |= PUSHING;
 880         request = xmalloc(sizeof(*request));
 881         request->obj = obj;
 882         request->url = NULL;
 883         request->lock = lock;
 884         request->headers = NULL;
 885         request->local_fileno = -1;
 886         request->state = NEED_PUSH;
 887         request->next = request_queue_head;
 888         request_queue_head = request;
 889
 890 #ifdef USE_CURL_MULTI
 891         fill_active_slots();
 892         step_active_slots();
 893 #endif
 894
 895         return 1;
 896 }
 897
 898 static int fetch_indices(void)
 899 {
 900         int ret;
 901
 902         if (push_verbosely)
 903                 fprintf(stderr, "Getting pack list\n");
 904
 905         switch (http_get_info_packs(repo->url, &repo->packs)) {
 906         case HTTP_OK:
 907         case HTTP_MISSING_TARGET:
 908                 ret = 0;
 909                 break;
 910         default:
 911                 ret = -1;
 912         }
 913
 914         return ret;
 915 }
 916
 917 static void one_remote_object(const char *hex)
 918 {
 919         unsigned char sha1[20];
 920         struct object *obj;
 921
 922         if (get_sha1_hex(hex, sha1) != 0)
 923                 return;
 924
 925         obj = lookup_object(sha1);
 926         if (!obj)
 927                 obj = parse_object(sha1);
 928
 929         /* Ignore remote objects that don't exist locally */
 930         if (!obj)
 931                 return;
 932
 933         obj->flags |= REMOTE;
 934         if (!object_list_contains(objects, obj))
 935                 object_list_insert(obj, &objects);
 936 }
 937
 938 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
 939 {
 940         int *lock_flags = (int *)ctx->userData;
 941
 942         if (tag_closed) {
 943                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
 944                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
 945                             (*lock_flags & DAV_PROP_LOCKWR)) {
 946                                 *lock_flags |= DAV_LOCK_OK;
 947                         }
 948                         *lock_flags &= DAV_LOCK_OK;
 949                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
 950                         *lock_flags |= DAV_PROP_LOCKWR;
 951                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
 952                         *lock_flags |= DAV_PROP_LOCKEX;
 953                 }
 954         }
 955 }
 956
 957 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
 958 {
 959         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
 960         git_SHA_CTX sha_ctx;
 961         unsigned char lock_token_sha1[20];
 962
 963         if (tag_closed && ctx->cdata) {
 964                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
 965                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
 966                         strcpy(lock->owner, ctx->cdata);
 967                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
 968                         if (!prefixcmp(ctx->cdata, "Second-"))
 969                                 lock->timeout =
 970                                         strtol(ctx->cdata + 7, NULL, 10);
 971                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
 972                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
 973                         strcpy(lock->token, ctx->cdata);
 974
 975                         git_SHA1_Init(&sha_ctx);
 976                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
 977                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
 978
 979                         lock->tmpfile_suffix[0] = '_';
 980                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
 981                 }
 982         }
 983 }
 984
 985 static void one_remote_ref(char *refname);
 986
 987 static void
 988 xml_start_tag(void *userData, const char *name, const char **atts)
 989 {
 990         struct xml_ctx *ctx = (struct xml_ctx *)userData;
 991         const char *c = strchr(name, ':');
 992         int new_len;
 993
 994         if (c == NULL)
 995                 c = name;
 996         else
 997                 c++;
 998
 999         new_len = strlen(ctx->name) + strlen(c) + 2;
1000
1001         if (new_len > ctx->len) {
1002                 ctx->name = xrealloc(ctx->name, new_len);
1003                 ctx->len = new_len;
1004         }
1005         strcat(ctx->name, ".");
1006         strcat(ctx->name, c);
1007
1008         free(ctx->cdata);
1009         ctx->cdata = NULL;
1010
1011         ctx->userFunc(ctx, 0);
1012 }
1013
1014 static void
1015 xml_end_tag(void *userData, const char *name)
1016 {
1017         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1018         const char *c = strchr(name, ':');
1019         char *ep;
1020
1021         ctx->userFunc(ctx, 1);
1022
1023         if (c == NULL)
1024                 c = name;
1025         else
1026                 c++;
1027
1028         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1029         *ep = 0;
1030 }
1031
1032 static void
1033 xml_cdata(void *userData, const XML_Char *s, int len)
1034 {
1035         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1036         free(ctx->cdata);
1037         ctx->cdata = xmemdupz(s, len);
1038 }
1039
1040 static struct remote_lock *lock_remote(const char *path, long timeout)
1041 {
1042         struct active_request_slot *slot;
1043         struct slot_results results;
1044         struct buffer out_buffer = { STRBUF_INIT, 0 };
1045         struct strbuf in_buffer = STRBUF_INIT;
1046         char *url;
1047         char *ep;
1048         char timeout_header[25];
1049         struct remote_lock *lock = NULL;
1050         struct curl_slist *dav_headers = NULL;
1051         struct xml_ctx ctx;
1052         char *escaped;
1053
1054         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1055         sprintf(url, "%s%s", repo->url, path);
1056
1057         /* Make sure leading directories exist for the remote ref */
1058         ep = strchr(url + strlen(repo->url) + 1, '/');
1059         while (ep) {
1060                 char saved_character = ep[1];
1061                 ep[1] = '\0';
1062                 slot = get_active_slot();
1063                 slot->results = &results;
1064                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1065                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1066                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1067                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1068                 if (start_active_slot(slot)) {
1069                         run_active_slot(slot);
1070                         if (results.curl_result != CURLE_OK &&
1071                             results.http_code != 405) {
1072                                 fprintf(stderr,
1073                                         "Unable to create branch path %s\n",
1074                                         url);
1075                                 free(url);
1076                                 return NULL;
1077                         }
1078                 } else {
1079                         fprintf(stderr, "Unable to start MKCOL request\n");
1080                         free(url);
1081                         return NULL;
1082                 }
1083                 ep[1] = saved_character;
1084                 ep = strchr(ep + 1, '/');
1085         }
1086
1087         escaped = xml_entities(git_default_email);
1088         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
1089         free(escaped);
1090
1091         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1092         dav_headers = curl_slist_append(dav_headers, timeout_header);
1093         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1094
1095         slot = get_active_slot();
1096         slot->results = &results;
1097         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1098         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1099         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1100 #ifndef NO_CURL_IOCTL
1101         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1102         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1103 #endif
1104         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1105         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1106         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1107         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1108         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1109         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1110
1111         lock = xcalloc(1, sizeof(*lock));
1112         lock->timeout = -1;
1113
1114         if (start_active_slot(slot)) {
1115                 run_active_slot(slot);
1116                 if (results.curl_result == CURLE_OK) {
1117                         XML_Parser parser = XML_ParserCreate(NULL);
1118                         enum XML_Status result;
1119                         ctx.name = xcalloc(10, 1);
1120                         ctx.len = 0;
1121                         ctx.cdata = NULL;
1122                         ctx.userFunc = handle_new_lock_ctx;
1123                         ctx.userData = lock;
1124                         XML_SetUserData(parser, &ctx);
1125                         XML_SetElementHandler(parser, xml_start_tag,
1126                                               xml_end_tag);
1127                         XML_SetCharacterDataHandler(parser, xml_cdata);
1128                         result = XML_Parse(parser, in_buffer.buf,
1129                                            in_buffer.len, 1);
1130                         free(ctx.name);
1131                         if (result != XML_STATUS_OK) {
1132                                 fprintf(stderr, "XML error: %s\n",
1133                                         XML_ErrorString(
1134                                                 XML_GetErrorCode(parser)));
1135                                 lock->timeout = -1;
1136                         }
1137                         XML_ParserFree(parser);
1138                 }
1139         } else {
1140                 fprintf(stderr, "Unable to start LOCK request\n");
1141         }
1142
1143         curl_slist_free_all(dav_headers);
1144         strbuf_release(&out_buffer.buf);
1145         strbuf_release(&in_buffer);
1146
1147         if (lock->token == NULL || lock->timeout <= 0) {
1148                 free(lock->token);
1149                 free(lock->owner);
1150                 free(url);
1151                 free(lock);
1152                 lock = NULL;
1153         } else {
1154                 lock->url = url;
1155                 lock->start_time = time(NULL);
1156                 lock->next = repo->locks;
1157                 repo->locks = lock;
1158         }
1159
1160         return lock;
1161 }
1162
1163 static int unlock_remote(struct remote_lock *lock)
1164 {
1165         struct active_request_slot *slot;
1166         struct slot_results results;
1167         struct remote_lock *prev = repo->locks;
1168         struct curl_slist *dav_headers;
1169         int rc = 0;
1170
1171         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1172
1173         slot = get_active_slot();
1174         slot->results = &results;
1175         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1176         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1177         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1178         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1179
1180         if (start_active_slot(slot)) {
1181                 run_active_slot(slot);
1182                 if (results.curl_result == CURLE_OK)
1183                         rc = 1;
1184                 else
1185                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1186                                 results.http_code);
1187         } else {
1188                 fprintf(stderr, "Unable to start UNLOCK request\n");
1189         }
1190
1191         curl_slist_free_all(dav_headers);
1192
1193         if (repo->locks == lock) {
1194                 repo->locks = lock->next;
1195         } else {
1196                 while (prev && prev->next != lock)
1197                         prev = prev->next;
1198                 if (prev)
1199                         prev->next = prev->next->next;
1200         }
1201
1202         free(lock->owner);
1203         free(lock->url);
1204         free(lock->token);
1205         free(lock);
1206
1207         return rc;
1208 }
1209
1210 static void remove_locks(void)
1211 {
1212         struct remote_lock *lock = repo->locks;
1213
1214         fprintf(stderr, "Removing remote locks...\n");
1215         while (lock) {
1216                 unlock_remote(lock);
1217                 lock = lock->next;
1218         }
1219 }
1220
1221 static void remove_locks_on_signal(int signo)
1222 {
1223         remove_locks();
1224         sigchain_pop(signo);
1225         raise(signo);
1226 }
1227
1228 static void remote_ls(const char *path, int flags,
1229                       void (*userFunc)(struct remote_ls_ctx *ls),
1230                       void *userData);
1231
1232 static void process_ls_object(struct remote_ls_ctx *ls)
1233 {
1234         unsigned int *parent = (unsigned int *)ls->userData;
1235         char *path = ls->dentry_name;
1236         char *obj_hex;
1237
1238         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1239                 remote_dir_exists[*parent] = 1;
1240                 return;
1241         }
1242
1243         if (strlen(path) != 49)
1244                 return;
1245         path += 8;
1246         obj_hex = xmalloc(strlen(path));
1247         /* NB: path is not null-terminated, can not use strlcpy here */
1248         memcpy(obj_hex, path, 2);
1249         strcpy(obj_hex + 2, path + 3);
1250         one_remote_object(obj_hex);
1251         free(obj_hex);
1252 }
1253
1254 static void process_ls_ref(struct remote_ls_ctx *ls)
1255 {
1256         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1257                 fprintf(stderr, "  %s\n", ls->dentry_name);
1258                 return;
1259         }
1260
1261         if (!(ls->dentry_flags & IS_DIR))
1262                 one_remote_ref(ls->dentry_name);
1263 }
1264
1265 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1266 {
1267         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1268
1269         if (tag_closed) {
1270                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1271                         if (ls->dentry_flags & IS_DIR) {
1272                                 if (ls->flags & PROCESS_DIRS) {
1273                                         ls->userFunc(ls);
1274                                 }
1275                                 if (strcmp(ls->dentry_name, ls->path) &&
1276                                     ls->flags & RECURSIVE) {
1277                                         remote_ls(ls->dentry_name,
1278                                                   ls->flags,
1279                                                   ls->userFunc,
1280                                                   ls->userData);
1281                                 }
1282                         } else if (ls->flags & PROCESS_FILES) {
1283                                 ls->userFunc(ls);
1284                         }
1285                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1286                         char *path = ctx->cdata;
1287                         if (*ctx->cdata == 'h') {
1288                                 path = strstr(path, "//");
1289                                 if (path) {
1290                                         path = strchr(path+2, '/');
1291                                 }
1292                         }
1293                         if (path) {
1294                                 path += repo->path_len;
1295                                 ls->dentry_name = xstrdup(path);
1296                         }
1297                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1298                         ls->dentry_flags |= IS_DIR;
1299                 }
1300         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1301                 free(ls->dentry_name);
1302                 ls->dentry_name = NULL;
1303                 ls->dentry_flags = 0;
1304         }
1305 }
1306
1307 /*
1308  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1309  * should _only_ heed the information from that file, instead of trying to
1310  * determine the refs from the remote file system (badly: it does not even
1311  * know about packed-refs).
1312  */
1313 static void remote_ls(const char *path, int flags,
1314                       void (*userFunc)(struct remote_ls_ctx *ls),
1315                       void *userData)
1316 {
1317         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1318         struct active_request_slot *slot;
1319         struct slot_results results;
1320         struct strbuf in_buffer = STRBUF_INIT;
1321         struct buffer out_buffer = { STRBUF_INIT, 0 };
1322         struct curl_slist *dav_headers = NULL;
1323         struct xml_ctx ctx;
1324         struct remote_ls_ctx ls;
1325
1326         ls.flags = flags;
1327         ls.path = xstrdup(path);
1328         ls.dentry_name = NULL;
1329         ls.dentry_flags = 0;
1330         ls.userData = userData;
1331         ls.userFunc = userFunc;
1332
1333         sprintf(url, "%s%s", repo->url, path);
1334
1335         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1336
1337         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1338         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1339
1340         slot = get_active_slot();
1341         slot->results = &results;
1342         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1343         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1344         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1345 #ifndef NO_CURL_IOCTL
1346         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1347         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1348 #endif
1349         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1350         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1351         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1352         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1353         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1354         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1355
1356         if (start_active_slot(slot)) {
1357                 run_active_slot(slot);
1358                 if (results.curl_result == CURLE_OK) {
1359                         XML_Parser parser = XML_ParserCreate(NULL);
1360                         enum XML_Status result;
1361                         ctx.name = xcalloc(10, 1);
1362                         ctx.len = 0;
1363                         ctx.cdata = NULL;
1364                         ctx.userFunc = handle_remote_ls_ctx;
1365                         ctx.userData = &ls;
1366                         XML_SetUserData(parser, &ctx);
1367                         XML_SetElementHandler(parser, xml_start_tag,
1368                                               xml_end_tag);
1369                         XML_SetCharacterDataHandler(parser, xml_cdata);
1370                         result = XML_Parse(parser, in_buffer.buf,
1371                                            in_buffer.len, 1);
1372                         free(ctx.name);
1373
1374                         if (result != XML_STATUS_OK) {
1375                                 fprintf(stderr, "XML error: %s\n",
1376                                         XML_ErrorString(
1377                                                 XML_GetErrorCode(parser)));
1378                         }
1379                         XML_ParserFree(parser);
1380                 }
1381         } else {
1382                 fprintf(stderr, "Unable to start PROPFIND request\n");
1383         }
1384
1385         free(ls.path);
1386         free(url);
1387         strbuf_release(&out_buffer.buf);
1388         strbuf_release(&in_buffer);
1389         curl_slist_free_all(dav_headers);
1390 }
1391
1392 static void get_remote_object_list(unsigned char parent)
1393 {
1394         char path[] = "objects/XX/";
1395         static const char hex[] = "0123456789abcdef";
1396         unsigned int val = parent;
1397
1398         path[8] = hex[val >> 4];
1399         path[9] = hex[val & 0xf];
1400         remote_dir_exists[val] = 0;
1401         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1402                   process_ls_object, &val);
1403 }
1404
1405 static int locking_available(void)
1406 {
1407         struct active_request_slot *slot;
1408         struct slot_results results;
1409         struct strbuf in_buffer = STRBUF_INIT;
1410         struct buffer out_buffer = { STRBUF_INIT, 0 };
1411         struct curl_slist *dav_headers = NULL;
1412         struct xml_ctx ctx;
1413         int lock_flags = 0;
1414         char *escaped;
1415
1416         escaped = xml_entities(repo->url);
1417         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1418         free(escaped);
1419
1420         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1421         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1422
1423         slot = get_active_slot();
1424         slot->results = &results;
1425         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1426         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1427         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1428 #ifndef NO_CURL_IOCTL
1429         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1430         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1431 #endif
1432         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1433         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1434         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1435         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1436         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1437         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1438
1439         if (start_active_slot(slot)) {
1440                 run_active_slot(slot);
1441                 if (results.curl_result == CURLE_OK) {
1442                         XML_Parser parser = XML_ParserCreate(NULL);
1443                         enum XML_Status result;
1444                         ctx.name = xcalloc(10, 1);
1445                         ctx.len = 0;
1446                         ctx.cdata = NULL;
1447                         ctx.userFunc = handle_lockprop_ctx;
1448                         ctx.userData = &lock_flags;
1449                         XML_SetUserData(parser, &ctx);
1450                         XML_SetElementHandler(parser, xml_start_tag,
1451                                               xml_end_tag);
1452                         result = XML_Parse(parser, in_buffer.buf,
1453                                            in_buffer.len, 1);
1454                         free(ctx.name);
1455
1456                         if (result != XML_STATUS_OK) {
1457                                 fprintf(stderr, "XML error: %s\n",
1458                                         XML_ErrorString(
1459                                                 XML_GetErrorCode(parser)));
1460                                 lock_flags = 0;
1461                         }
1462                         XML_ParserFree(parser);
1463                         if (!lock_flags)
1464                                 error("no DAV locking support on %s",
1465                                       repo->url);
1466
1467                 } else {
1468                         error("Cannot access URL %s, return code %d",
1469                               repo->url, results.curl_result);
1470                         lock_flags = 0;
1471                 }
1472         } else {
1473                 error("Unable to start PROPFIND request on %s", repo->url);
1474         }
1475
1476         strbuf_release(&out_buffer.buf);
1477         strbuf_release(&in_buffer);
1478         curl_slist_free_all(dav_headers);
1479
1480         return lock_flags;
1481 }
1482
1483 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1484 {
1485         struct object_list *entry = xmalloc(sizeof(struct object_list));
1486         entry->item = obj;
1487         entry->next = *p;
1488         *p = entry;
1489         return &entry->next;
1490 }
1491
1492 static struct object_list **process_blob(struct blob *blob,
1493                                          struct object_list **p,
1494                                          struct name_path *path,
1495                                          const char *name)
1496 {
1497         struct object *obj = &blob->object;
1498
1499         obj->flags |= LOCAL;
1500
1501         if (obj->flags & (UNINTERESTING | SEEN))
1502                 return p;
1503
1504         obj->flags |= SEEN;
1505         return add_one_object(obj, p);
1506 }
1507
1508 static struct object_list **process_tree(struct tree *tree,
1509                                          struct object_list **p,
1510                                          struct name_path *path,
1511                                          const char *name)
1512 {
1513         struct object *obj = &tree->object;
1514         struct tree_desc desc;
1515         struct name_entry entry;
1516         struct name_path me;
1517
1518         obj->flags |= LOCAL;
1519
1520         if (obj->flags & (UNINTERESTING | SEEN))
1521                 return p;
1522         if (parse_tree(tree) < 0)
1523                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1524
1525         obj->flags |= SEEN;
1526         name = xstrdup(name);
1527         p = add_one_object(obj, p);
1528         me.up = path;
1529         me.elem = name;
1530         me.elem_len = strlen(name);
1531
1532         init_tree_desc(&desc, tree->buffer, tree->size);
1533
1534         while (tree_entry(&desc, &entry))
1535                 switch (object_type(entry.mode)) {
1536                 case OBJ_TREE:
1537                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1538                         break;
1539                 case OBJ_BLOB:
1540                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1541                         break;
1542                 default:
1543                         /* Subproject commit - not in this repository */
1544                         break;
1545                 }
1546
1547         free(tree->buffer);
1548         tree->buffer = NULL;
1549         return p;
1550 }
1551
1552 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1553 {
1554         int i;
1555         struct commit *commit;
1556         struct object_list **p = &objects;
1557         int count = 0;
1558
1559         while ((commit = get_revision(revs)) != NULL) {
1560                 p = process_tree(commit->tree, p, NULL, "");
1561                 commit->object.flags |= LOCAL;
1562                 if (!(commit->object.flags & UNINTERESTING))
1563                         count += add_send_request(&commit->object, lock);
1564         }
1565
1566         for (i = 0; i < revs->pending.nr; i++) {
1567                 struct object_array_entry *entry = revs->pending.objects + i;
1568                 struct object *obj = entry->item;
1569                 const char *name = entry->name;
1570
1571                 if (obj->flags & (UNINTERESTING | SEEN))
1572                         continue;
1573                 if (obj->type == OBJ_TAG) {
1574                         obj->flags |= SEEN;
1575                         p = add_one_object(obj, p);
1576                         continue;
1577                 }
1578                 if (obj->type == OBJ_TREE) {
1579                         p = process_tree((struct tree *)obj, p, NULL, name);
1580                         continue;
1581                 }
1582                 if (obj->type == OBJ_BLOB) {
1583                         p = process_blob((struct blob *)obj, p, NULL, name);
1584                         continue;
1585                 }
1586                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1587         }
1588
1589         while (objects) {
1590                 if (!(objects->item->flags & UNINTERESTING))
1591                         count += add_send_request(objects->item, lock);
1592                 objects = objects->next;
1593         }
1594
1595         return count;
1596 }
1597
1598 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1599 {
1600         struct active_request_slot *slot;
1601         struct slot_results results;
1602         struct buffer out_buffer = { STRBUF_INIT, 0 };
1603         struct curl_slist *dav_headers;
1604
1605         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1606
1607         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1608
1609         slot = get_active_slot();
1610         slot->results = &results;
1611         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1612         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1613         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1614 #ifndef NO_CURL_IOCTL
1615         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1616         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1617 #endif
1618         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1619         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1620         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1621         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1622         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1623         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1624
1625         if (start_active_slot(slot)) {
1626                 run_active_slot(slot);
1627                 strbuf_release(&out_buffer.buf);
1628                 if (results.curl_result != CURLE_OK) {
1629                         fprintf(stderr,
1630                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1631                                 results.curl_result, results.http_code);
1632                         /* We should attempt recovery? */
1633                         return 0;
1634                 }
1635         } else {
1636                 strbuf_release(&out_buffer.buf);
1637                 fprintf(stderr, "Unable to start PUT request\n");
1638                 return 0;
1639         }
1640
1641         return 1;
1642 }
1643
1644 static struct ref *remote_refs, **remote_tail;
1645
1646 static void one_remote_ref(char *refname)
1647 {
1648         struct ref *ref;
1649         struct object *obj;
1650
1651         ref = alloc_ref(refname);
1652
1653         if (http_fetch_ref(repo->url, ref) != 0) {
1654                 fprintf(stderr,
1655                         "Unable to fetch ref %s from %s\n",
1656                         refname, repo->url);
1657                 free(ref);
1658                 return;
1659         }
1660
1661         /*
1662          * Fetch a copy of the object if it doesn't exist locally - it
1663          * may be required for updating server info later.
1664          */
1665         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1666                 obj = lookup_unknown_object(ref->old_sha1);
1667                 if (obj) {
1668                         fprintf(stderr, "  fetch %s for %s\n",
1669                                 sha1_to_hex(ref->old_sha1), refname);
1670                         add_fetch_request(obj);
1671                 }
1672         }
1673
1674         *remote_tail = ref;
1675         remote_tail = &ref->next;
1676 }
1677
1678 static void get_dav_remote_heads(void)
1679 {
1680         remote_tail = &remote_refs;
1681         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1682 }
1683
1684 static int is_zero_sha1(const unsigned char *sha1)
1685 {
1686         int i;
1687
1688         for (i = 0; i < 20; i++) {
1689                 if (*sha1++)
1690                         return 0;
1691         }
1692         return 1;
1693 }
1694
1695 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1696 {
1697         struct strbuf *buf = (struct strbuf *)ls->userData;
1698         struct object *o;
1699         int len;
1700         char *ref_info;
1701         struct ref *ref;
1702
1703         ref = alloc_ref(ls->dentry_name);
1704
1705         if (http_fetch_ref(repo->url, ref) != 0) {
1706                 fprintf(stderr,
1707                         "Unable to fetch ref %s from %s\n",
1708                         ls->dentry_name, repo->url);
1709                 aborted = 1;
1710                 free(ref);
1711                 return;
1712         }
1713
1714         o = parse_object(ref->old_sha1);
1715         if (!o) {
1716                 fprintf(stderr,
1717                         "Unable to parse object %s for remote ref %s\n",
1718                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1719                 aborted = 1;
1720                 free(ref);
1721                 return;
1722         }
1723
1724         len = strlen(ls->dentry_name) + 42;
1725         ref_info = xcalloc(len + 1, 1);
1726         sprintf(ref_info, "%s   %s\n",
1727                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1728         fwrite_buffer(ref_info, 1, len, buf);
1729         free(ref_info);
1730
1731         if (o->type == OBJ_TAG) {
1732                 o = deref_tag(o, ls->dentry_name, 0);
1733                 if (o) {
1734                         len = strlen(ls->dentry_name) + 45;
1735                         ref_info = xcalloc(len + 1, 1);
1736                         sprintf(ref_info, "%s   %s^{}\n",
1737                                 sha1_to_hex(o->sha1), ls->dentry_name);
1738                         fwrite_buffer(ref_info, 1, len, buf);
1739                         free(ref_info);
1740                 }
1741         }
1742         free(ref);
1743 }
1744
1745 static void update_remote_info_refs(struct remote_lock *lock)
1746 {
1747         struct buffer buffer = { STRBUF_INIT, 0 };
1748         struct active_request_slot *slot;
1749         struct slot_results results;
1750         struct curl_slist *dav_headers;
1751
1752         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1753                   add_remote_info_ref, &buffer.buf);
1754         if (!aborted) {
1755                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1756
1757                 slot = get_active_slot();
1758                 slot->results = &results;
1759                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1760                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1761                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1762 #ifndef NO_CURL_IOCTL
1763                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1764                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1765 #endif
1766                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1767                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1768                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1769                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1770                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1771                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1772
1773                 if (start_active_slot(slot)) {
1774                         run_active_slot(slot);
1775                         if (results.curl_result != CURLE_OK) {
1776                                 fprintf(stderr,
1777                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1778                                         results.curl_result, results.http_code);
1779                         }
1780                 }
1781         }
1782         strbuf_release(&buffer.buf);
1783 }
1784
1785 static int remote_exists(const char *path)
1786 {
1787         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1788         int ret;
1789
1790         sprintf(url, "%s%s", repo->url, path);
1791
1792         switch (http_get_strbuf(url, NULL, 0)) {
1793         case HTTP_OK:
1794                 ret = 1;
1795                 break;
1796         case HTTP_MISSING_TARGET:
1797                 ret = 0;
1798                 break;
1799         case HTTP_ERROR:
1800                 http_error(url, HTTP_ERROR);
1801         default:
1802                 ret = -1;
1803         }
1804         free(url);
1805         return ret;
1806 }
1807
1808 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
1809 {
1810         char *url;
1811         struct strbuf buffer = STRBUF_INIT;
1812
1813         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1814         sprintf(url, "%s%s", repo->url, path);
1815
1816         if (http_get_strbuf(url, &buffer, 0) != HTTP_OK)
1817                 die("Couldn't get %s for remote symref\n%s", url,
1818                     curl_errorstr);
1819         free(url);
1820
1821         free(*symref);
1822         *symref = NULL;
1823         hashclr(sha1);
1824
1825         if (buffer.len == 0)
1826                 return;
1827
1828         /* If it's a symref, set the refname; otherwise try for a sha1 */
1829         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
1830                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
1831         } else {
1832                 get_sha1_hex(buffer.buf, sha1);
1833         }
1834
1835         strbuf_release(&buffer);
1836 }
1837
1838 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
1839 {
1840         struct commit *head = lookup_commit(head_sha1);
1841         struct commit *branch = lookup_commit(branch_sha1);
1842         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
1843
1844         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
1845 }
1846
1847 static int delete_remote_branch(char *pattern, int force)
1848 {
1849         struct ref *refs = remote_refs;
1850         struct ref *remote_ref = NULL;
1851         unsigned char head_sha1[20];
1852         char *symref = NULL;
1853         int match;
1854         int patlen = strlen(pattern);
1855         int i;
1856         struct active_request_slot *slot;
1857         struct slot_results results;
1858         char *url;
1859
1860         /* Find the remote branch(es) matching the specified branch name */
1861         for (match = 0; refs; refs = refs->next) {
1862                 char *name = refs->name;
1863                 int namelen = strlen(name);
1864                 if (namelen < patlen ||
1865                     memcmp(name + namelen - patlen, pattern, patlen))
1866                         continue;
1867                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
1868                         continue;
1869                 match++;
1870                 remote_ref = refs;
1871         }
1872         if (match == 0)
1873                 return error("No remote branch matches %s", pattern);
1874         if (match != 1)
1875                 return error("More than one remote branch matches %s",
1876                              pattern);
1877
1878         /*
1879          * Remote HEAD must be a symref (not exactly foolproof; a remote
1880          * symlink to a symref will look like a symref)
1881          */
1882         fetch_symref("HEAD", &symref, head_sha1);
1883         if (!symref)
1884                 return error("Remote HEAD is not a symref");
1885
1886         /* Remote branch must not be the remote HEAD */
1887         for (i=0; symref && i<MAXDEPTH; i++) {
1888                 if (!strcmp(remote_ref->name, symref))
1889                         return error("Remote branch %s is the current HEAD",
1890                                      remote_ref->name);
1891                 fetch_symref(symref, &symref, head_sha1);
1892         }
1893
1894         /* Run extra sanity checks if delete is not forced */
1895         if (!force) {
1896                 /* Remote HEAD must resolve to a known object */
1897                 if (symref)
1898                         return error("Remote HEAD symrefs too deep");
1899                 if (is_zero_sha1(head_sha1))
1900                         return error("Unable to resolve remote HEAD");
1901                 if (!has_sha1_file(head_sha1))
1902                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
1903
1904                 /* Remote branch must resolve to a known object */
1905                 if (is_zero_sha1(remote_ref->old_sha1))
1906                         return error("Unable to resolve remote branch %s",
1907                                      remote_ref->name);
1908                 if (!has_sha1_file(remote_ref->old_sha1))
1909                         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));
1910
1911                 /* Remote branch must be an ancestor of remote HEAD */
1912                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
1913                         return error("The branch '%s' is not an ancestor "
1914                                      "of your current HEAD.\n"
1915                                      "If you are sure you want to delete it,"
1916                                      " run:\n\t'git http-push -D %s %s'",
1917                                      remote_ref->name, repo->url, pattern);
1918                 }
1919         }
1920
1921         /* Send delete request */
1922         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
1923         if (dry_run)
1924                 return 0;
1925         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
1926         sprintf(url, "%s%s", repo->url, remote_ref->name);
1927         slot = get_active_slot();
1928         slot->results = &results;
1929         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1930         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1931         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1932         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
1933         if (start_active_slot(slot)) {
1934                 run_active_slot(slot);
1935                 free(url);
1936                 if (results.curl_result != CURLE_OK)
1937                         return error("DELETE request failed (%d/%ld)\n",
1938                                      results.curl_result, results.http_code);
1939         } else {
1940                 free(url);
1941                 return error("Unable to start DELETE request");
1942         }
1943
1944         return 0;
1945 }
1946
1947 void run_request_queue(void)
1948 {
1949 #ifdef USE_CURL_MULTI
1950         is_running_queue = 1;
1951         fill_active_slots();
1952         add_fill_function(NULL, fill_active_slot);
1953 #endif
1954         do {
1955                 finish_all_active_slots();
1956 #ifdef USE_CURL_MULTI
1957                 fill_active_slots();
1958 #endif
1959         } while (request_queue_head && !aborted);
1960
1961 #ifdef USE_CURL_MULTI
1962         is_running_queue = 0;
1963 #endif
1964 }
1965
1966 int main(int argc, char **argv)
1967 {
1968         struct transfer_request *request;
1969         struct transfer_request *next_request;
1970         int nr_refspec = 0;
1971         char **refspec = NULL;
1972         struct remote_lock *ref_lock = NULL;
1973         struct remote_lock *info_ref_lock = NULL;
1974         struct rev_info revs;
1975         int delete_branch = 0;
1976         int force_delete = 0;
1977         int objects_to_send;
1978         int rc = 0;
1979         int i;
1980         int new_refs;
1981         struct ref *ref, *local_refs;
1982         struct remote *remote;
1983         char *rewritten_url = NULL;
1984
1985         git_extract_argv0_path(argv[0]);
1986
1987         setup_git_directory();
1988
1989         repo = xcalloc(sizeof(*repo), 1);
1990
1991         argv++;
1992         for (i = 1; i < argc; i++, argv++) {
1993                 char *arg = *argv;
1994
1995                 if (*arg == '-') {
1996                         if (!strcmp(arg, "--all")) {
1997                                 push_all = MATCH_REFS_ALL;
1998                                 continue;
1999                         }
2000                         if (!strcmp(arg, "--force")) {
2001                                 force_all = 1;
2002                                 continue;
2003                         }
2004                         if (!strcmp(arg, "--dry-run")) {
2005                                 dry_run = 1;
2006                                 continue;
2007                         }
2008                         if (!strcmp(arg, "--verbose")) {
2009                                 push_verbosely = 1;
2010                                 http_is_verbose = 1;
2011                                 continue;
2012                         }
2013                         if (!strcmp(arg, "-d")) {
2014                                 delete_branch = 1;
2015                                 continue;
2016                         }
2017                         if (!strcmp(arg, "-D")) {
2018                                 delete_branch = 1;
2019                                 force_delete = 1;
2020                                 continue;
2021                         }
2022                 }
2023                 if (!repo->url) {
2024                         char *path = strstr(arg, "//");
2025                         repo->url = arg;
2026                         repo->path_len = strlen(arg);
2027                         if (path) {
2028                                 repo->path = strchr(path+2, '/');
2029                                 if (repo->path)
2030                                         repo->path_len = strlen(repo->path);
2031                         }
2032                         continue;
2033                 }
2034                 refspec = argv;
2035                 nr_refspec = argc - i;
2036                 break;
2037         }
2038
2039 #ifndef USE_CURL_MULTI
2040         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2041 #endif
2042
2043         if (!repo->url)
2044                 usage(http_push_usage);
2045
2046         if (delete_branch && nr_refspec != 1)
2047                 die("You must specify only one branch name when deleting a remote branch");
2048
2049         memset(remote_dir_exists, -1, 256);
2050
2051         /*
2052          * Create a minimum remote by hand to give to http_init(),
2053          * primarily to allow it to look at the URL.
2054          */
2055         remote = xcalloc(sizeof(*remote), 1);
2056         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
2057         remote->url[remote->url_nr++] = repo->url;
2058         http_init(remote);
2059
2060         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
2061                 rewritten_url = xmalloc(strlen(repo->url)+2);
2062                 strcpy(rewritten_url, repo->url);
2063                 strcat(rewritten_url, "/");
2064                 repo->path = rewritten_url + (repo->path - repo->url);
2065                 repo->path_len++;
2066                 repo->url = rewritten_url;
2067         }
2068
2069 #ifdef USE_CURL_MULTI
2070         is_running_queue = 0;
2071 #endif
2072
2073         /* Verify DAV compliance/lock support */
2074         if (!locking_available()) {
2075                 rc = 1;
2076                 goto cleanup;
2077         }
2078
2079         sigchain_push_common(remove_locks_on_signal);
2080
2081         /* Check whether the remote has server info files */
2082         repo->can_update_info_refs = 0;
2083         repo->has_info_refs = remote_exists("info/refs");
2084         repo->has_info_packs = remote_exists("objects/info/packs");
2085         if (repo->has_info_refs) {
2086                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2087                 if (info_ref_lock)
2088                         repo->can_update_info_refs = 1;
2089                 else {
2090                         error("cannot lock existing info/refs");
2091                         rc = 1;
2092                         goto cleanup;
2093                 }
2094         }
2095         if (repo->has_info_packs)
2096                 fetch_indices();
2097
2098         /* Get a list of all local and remote heads to validate refspecs */
2099         local_refs = get_local_heads();
2100         fprintf(stderr, "Fetching remote heads...\n");
2101         get_dav_remote_heads();
2102         run_request_queue();
2103
2104         /* Remove a remote branch if -d or -D was specified */
2105         if (delete_branch) {
2106                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2107                         fprintf(stderr, "Unable to delete remote branch %s\n",
2108                                 refspec[0]);
2109                 goto cleanup;
2110         }
2111
2112         /* match them up */
2113         if (!remote_tail)
2114                 remote_tail = &remote_refs;
2115         if (match_refs(local_refs, remote_refs, &remote_tail,
2116                        nr_refspec, (const char **) refspec, push_all)) {
2117                 rc = -1;
2118                 goto cleanup;
2119         }
2120         if (!remote_refs) {
2121                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2122                 rc = 0;
2123                 goto cleanup;
2124         }
2125
2126         new_refs = 0;
2127         for (ref = remote_refs; ref; ref = ref->next) {
2128                 char old_hex[60], *new_hex;
2129                 const char *commit_argv[4];
2130                 int commit_argc;
2131                 char *new_sha1_hex, *old_sha1_hex;
2132
2133                 if (!ref->peer_ref)
2134                         continue;
2135
2136                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2137                         if (delete_remote_branch(ref->name, 1) == -1) {
2138                                 error("Could not remove %s", ref->name);
2139                                 rc = -4;
2140                         }
2141                         new_refs++;
2142                         continue;
2143                 }
2144
2145                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2146                         if (push_verbosely || 1)
2147                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2148                         continue;
2149                 }
2150
2151                 if (!force_all &&
2152                     !is_zero_sha1(ref->old_sha1) &&
2153                     !ref->force) {
2154                         if (!has_sha1_file(ref->old_sha1) ||
2155                             !ref_newer(ref->peer_ref->new_sha1,
2156                                        ref->old_sha1)) {
2157                                 /*
2158                                  * We do not have the remote ref, or
2159                                  * we know that the remote ref is not
2160                                  * an ancestor of what we are trying to
2161                                  * push.  Either way this can be losing
2162                                  * commits at the remote end and likely
2163                                  * we were not up to date to begin with.
2164                                  */
2165                                 error("remote '%s' is not an ancestor of\n"
2166                                       "local '%s'.\n"
2167                                       "Maybe you are not up-to-date and "
2168                                       "need to pull first?",
2169                                       ref->name,
2170                                       ref->peer_ref->name);
2171                                 rc = -2;
2172                                 continue;
2173                         }
2174                 }
2175                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2176                 new_refs++;
2177                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2178                 new_hex = sha1_to_hex(ref->new_sha1);
2179
2180                 fprintf(stderr, "updating '%s'", ref->name);
2181                 if (strcmp(ref->name, ref->peer_ref->name))
2182                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2183                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2184                 if (dry_run)
2185                         continue;
2186
2187                 /* Lock remote branch ref */
2188                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2189                 if (ref_lock == NULL) {
2190                         fprintf(stderr, "Unable to lock remote branch %s\n",
2191                                 ref->name);
2192                         rc = 1;
2193                         continue;
2194                 }
2195
2196                 /* Set up revision info for this refspec */
2197                 commit_argc = 3;
2198                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2199                 old_sha1_hex = NULL;
2200                 commit_argv[1] = "--objects";
2201                 commit_argv[2] = new_sha1_hex;
2202                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2203                         old_sha1_hex = xmalloc(42);
2204                         sprintf(old_sha1_hex, "^%s",
2205                                 sha1_to_hex(ref->old_sha1));
2206                         commit_argv[3] = old_sha1_hex;
2207                         commit_argc++;
2208                 }
2209                 init_revisions(&revs, setup_git_directory());
2210                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2211                 revs.edge_hint = 0; /* just in case */
2212                 free(new_sha1_hex);
2213                 if (old_sha1_hex) {
2214                         free(old_sha1_hex);
2215                         commit_argv[1] = NULL;
2216                 }
2217
2218                 /* Generate a list of objects that need to be pushed */
2219                 pushing = 0;
2220                 if (prepare_revision_walk(&revs))
2221                         die("revision walk setup failed");
2222                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2223                 objects_to_send = get_delta(&revs, ref_lock);
2224                 finish_all_active_slots();
2225
2226                 /* Push missing objects to remote, this would be a
2227                    convenient time to pack them first if appropriate. */
2228                 pushing = 1;
2229                 if (objects_to_send)
2230                         fprintf(stderr, "    sending %d objects\n",
2231                                 objects_to_send);
2232
2233                 run_request_queue();
2234
2235                 /* Update the remote branch if all went well */
2236                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2237                         rc = 1;
2238
2239                 if (!rc)
2240                         fprintf(stderr, "    done\n");
2241                 unlock_remote(ref_lock);
2242                 check_locks();
2243         }
2244
2245         /* Update remote server info if appropriate */
2246         if (repo->has_info_refs && new_refs) {
2247                 if (info_ref_lock && repo->can_update_info_refs) {
2248                         fprintf(stderr, "Updating remote server info\n");
2249                         if (!dry_run)
2250                                 update_remote_info_refs(info_ref_lock);
2251                 } else {
2252                         fprintf(stderr, "Unable to update server info\n");
2253                 }
2254         }
2255
2256  cleanup:
2257         free(rewritten_url);
2258         if (info_ref_lock)
2259                 unlock_remote(info_ref_lock);
2260         free(repo);
2261
2262         http_cleanup();
2263
2264         request = request_queue_head;
2265         while (request != NULL) {
2266                 next_request = request->next;
2267                 release_request(request);
2268                 request = next_request;
2269         }
2270
2271         return rc;
2272 }