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

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "tag.h"
   5 #include "blob.h"
   6 #include "http.h"
   7 #include "refs.h"
   8 #include "diff.h"
   9 #include "revision.h"
  10 #include "exec_cmd.h"
  11 #include "remote.h"
  12 #include "list-objects.h"
  13 #include "sigchain.h"
  14
  15 #include <expat.h>
  16
  17 static const char http_push_usage[] =
  18 "git http-push [--all] [--dry-run] [--force] [--verbose] <remote> [<head>...]\n";
  19
  20 #ifndef XML_STATUS_OK
  21 enum XML_Status {
  22   XML_STATUS_OK = 1,
  23   XML_STATUS_ERROR = 0
  24 };
  25 #define XML_STATUS_OK    1
  26 #define XML_STATUS_ERROR 0
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 /* DAV methods */
  33 #define DAV_LOCK "LOCK"
  34 #define DAV_MKCOL "MKCOL"
  35 #define DAV_MOVE "MOVE"
  36 #define DAV_PROPFIND "PROPFIND"
  37 #define DAV_PUT "PUT"
  38 #define DAV_UNLOCK "UNLOCK"
  39 #define DAV_DELETE "DELETE"
  40
  41 /* DAV lock flags */
  42 #define DAV_PROP_LOCKWR (1u << 0)
  43 #define DAV_PROP_LOCKEX (1u << 1)
  44 #define DAV_LOCK_OK (1u << 2)
  45
  46 /* DAV XML properties */
  47 #define DAV_CTX_LOCKENTRY ".multistatus.response.propstat.prop.supportedlock.lockentry"
  48 #define DAV_CTX_LOCKTYPE_WRITE ".multistatus.response.propstat.prop.supportedlock.lockentry.locktype.write"
  49 #define DAV_CTX_LOCKTYPE_EXCLUSIVE ".multistatus.response.propstat.prop.supportedlock.lockentry.lockscope.exclusive"
  50 #define DAV_ACTIVELOCK_OWNER ".prop.lockdiscovery.activelock.owner.href"
  51 #define DAV_ACTIVELOCK_TIMEOUT ".prop.lockdiscovery.activelock.timeout"
  52 #define DAV_ACTIVELOCK_TOKEN ".prop.lockdiscovery.activelock.locktoken.href"
  53 #define DAV_PROPFIND_RESP ".multistatus.response"
  54 #define DAV_PROPFIND_NAME ".multistatus.response.href"
  55 #define DAV_PROPFIND_COLLECTION ".multistatus.response.propstat.prop.resourcetype.collection"
  56
  57 /* DAV request body templates */
  58 #define PROPFIND_SUPPORTEDLOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop xmlns:R=\"%s\">\n<D:supportedlock/>\n</D:prop>\n</D:propfind>"
  59 #define PROPFIND_ALL_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/>\n</D:propfind>"
  60 #define LOCK_REQUEST "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:lockinfo xmlns:D=\"DAV:\">\n<D:lockscope><D:exclusive/></D:lockscope>\n<D:locktype><D:write/></D:locktype>\n<D:owner>\n<D:href>mailto:%s</D:href>\n</D:owner>\n</D:lockinfo>"
  61
  62 #define LOCK_TIME 600
  63 #define LOCK_REFRESH 30
  64
  65 /* bits #0-15 in revision.h */
  66
  67 #define LOCAL    (1u<<16)
  68 #define REMOTE   (1u<<17)
  69 #define FETCHING (1u<<18)
  70 #define PUSHING  (1u<<19)
  71
  72 /* We allow "recursive" symbolic refs. Only within reason, though */
  73 #define MAXDEPTH 5
  74
  75 static int pushing;
  76 static int aborted;
  77 static signed char remote_dir_exists[256];
  78
  79 static struct curl_slist *no_pragma_header;
  80
  81 static int push_verbosely;
  82 static int push_all = MATCH_REFS_NONE;
  83 static int force_all;
  84 static int dry_run;
  85
  86 static struct object_list *objects;
  87
  88 struct repo
  89 {
  90         char *url;
  91         char *path;
  92         int path_len;
  93         int has_info_refs;
  94         int can_update_info_refs;
  95         int has_info_packs;
  96         struct packed_git *packs;
  97         struct remote_lock *locks;
  98 };
  99
 100 static struct repo *repo;
 101
 102 enum transfer_state {
 103         NEED_FETCH,
 104         RUN_FETCH_LOOSE,
 105         RUN_FETCH_PACKED,
 106         NEED_PUSH,
 107         RUN_MKCOL,
 108         RUN_PUT,
 109         RUN_MOVE,
 110         ABORTED,
 111         COMPLETE,
 112 };
 113
 114 struct transfer_request
 115 {
 116         struct object *obj;
 117         char *url;
 118         char *dest;
 119         struct remote_lock *lock;
 120         struct curl_slist *headers;
 121         struct buffer buffer;
 122         char filename[PATH_MAX];
 123         char tmpfile[PATH_MAX];
 124         int local_fileno;
 125         FILE *local_stream;
 126         enum transfer_state state;
 127         CURLcode curl_result;
 128         char errorstr[CURL_ERROR_SIZE];
 129         long http_code;
 130         unsigned char real_sha1[20];
 131         git_SHA_CTX c;
 132         z_stream stream;
 133         int zret;
 134         int rename;
 135         void *userData;
 136         struct active_request_slot *slot;
 137         struct transfer_request *next;
 138 };
 139
 140 static struct transfer_request *request_queue_head;
 141
 142 struct xml_ctx
 143 {
 144         char *name;
 145         int len;
 146         char *cdata;
 147         void (*userFunc)(struct xml_ctx *ctx, int tag_closed);
 148         void *userData;
 149 };
 150
 151 struct remote_lock
 152 {
 153         char *url;
 154         char *owner;
 155         char *token;
 156         char tmpfile_suffix[41];
 157         time_t start_time;
 158         long timeout;
 159         int refreshing;
 160         struct remote_lock *next;
 161 };
 162
 163 /* Flags that control remote_ls processing */
 164 #define PROCESS_FILES (1u << 0)
 165 #define PROCESS_DIRS  (1u << 1)
 166 #define RECURSIVE     (1u << 2)
 167
 168 /* Flags that remote_ls passes to callback functions */
 169 #define IS_DIR (1u << 0)
 170
 171 struct remote_ls_ctx
 172 {
 173         char *path;
 174         void (*userFunc)(struct remote_ls_ctx *ls);
 175         void *userData;
 176         int flags;
 177         char *dentry_name;
 178         int dentry_flags;
 179         struct remote_ls_ctx *parent;
 180 };
 181
 182 /* get_dav_token_headers options */
 183 enum dav_header_flag {
 184         DAV_HEADER_IF = (1u << 0),
 185         DAV_HEADER_LOCK = (1u << 1),
 186         DAV_HEADER_TIMEOUT = (1u << 2)
 187 };
 188
 189 static char *xml_entities(char *s)
 190 {
 191         struct strbuf buf = STRBUF_INIT;
 192         while (*s) {
 193                 size_t len = strcspn(s, "\"<>&");
 194                 strbuf_add(&buf, s, len);
 195                 s += len;
 196                 switch (*s) {
 197                 case '"':
 198                         strbuf_addstr(&buf, "&quot;");
 199                         break;
 200                 case '<':
 201                         strbuf_addstr(&buf, "&lt;");
 202                         break;
 203                 case '>':
 204                         strbuf_addstr(&buf, "&gt;");
 205                         break;
 206                 case '&':
 207                         strbuf_addstr(&buf, "&amp;");
 208                         break;
 209                 }
 210                 s++;
 211         }
 212         return strbuf_detach(&buf, NULL);
 213 }
 214
 215 static struct curl_slist *get_dav_token_headers(struct remote_lock *lock, enum dav_header_flag options)
 216 {
 217         struct strbuf buf = STRBUF_INIT;
 218         struct curl_slist *dav_headers = NULL;
 219
 220         if (options & DAV_HEADER_IF) {
 221                 strbuf_addf(&buf, "If: (<%s>)", lock->token);
 222                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 223                 strbuf_reset(&buf);
 224         }
 225         if (options & DAV_HEADER_LOCK) {
 226                 strbuf_addf(&buf, "Lock-Token: <%s>", lock->token);
 227                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 228                 strbuf_reset(&buf);
 229         }
 230         if (options & DAV_HEADER_TIMEOUT) {
 231                 strbuf_addf(&buf, "Timeout: Second-%ld", lock->timeout);
 232                 dav_headers = curl_slist_append(dav_headers, buf.buf);
 233                 strbuf_reset(&buf);
 234         }
 235         strbuf_release(&buf);
 236
 237         return dav_headers;
 238 }
 239
 240 static void append_remote_object_url(struct strbuf *buf, const char *url,
 241                                      const char *hex,
 242                                      int only_two_digit_prefix)
 243 {
 244         strbuf_addf(buf, "%sobjects/%.*s/", url, 2, hex);
 245         if (!only_two_digit_prefix)
 246                 strbuf_addf(buf, "%s", hex+2);
 247 }
 248
 249 static void finish_request(struct transfer_request *request);
 250 static void release_request(struct transfer_request *request);
 251
 252 static void process_response(void *callback_data)
 253 {
 254         struct transfer_request *request =
 255                 (struct transfer_request *)callback_data;
 256
 257         finish_request(request);
 258 }
 259
 260 #ifdef USE_CURL_MULTI
 261
 262 static char *get_remote_object_url(const char *url, const char *hex,
 263                                    int only_two_digit_prefix)
 264 {
 265         struct strbuf buf = STRBUF_INIT;
 266         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 267         return strbuf_detach(&buf, NULL);
 268 }
 269
 270 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 271                                void *data)
 272 {
 273         unsigned char expn[4096];
 274         size_t size = eltsize * nmemb;
 275         int posn = 0;
 276         struct transfer_request *request = (struct transfer_request *)data;
 277         do {
 278                 ssize_t retval = xwrite(request->local_fileno,
 279                                         (char *) ptr + posn, size - posn);
 280                 if (retval < 0)
 281                         return posn;
 282                 posn += retval;
 283         } while (posn < size);
 284
 285         request->stream.avail_in = size;
 286         request->stream.next_in = ptr;
 287         do {
 288                 request->stream.next_out = expn;
 289                 request->stream.avail_out = sizeof(expn);
 290                 request->zret = git_inflate(&request->stream, Z_SYNC_FLUSH);
 291                 git_SHA1_Update(&request->c, expn,
 292                                 sizeof(expn) - request->stream.avail_out);
 293         } while (request->stream.avail_in && request->zret == Z_OK);
 294         data_received++;
 295         return size;
 296 }
 297
 298 static void start_fetch_loose(struct transfer_request *request)
 299 {
 300         char *hex = sha1_to_hex(request->obj->sha1);
 301         char *filename;
 302         char prevfile[PATH_MAX];
 303         char *url;
 304         int prevlocal;
 305         unsigned char prev_buf[PREV_BUF_SIZE];
 306         ssize_t prev_read = 0;
 307         long prev_posn = 0;
 308         char range[RANGE_HEADER_SIZE];
 309         struct curl_slist *range_header = NULL;
 310         struct active_request_slot *slot;
 311
 312         filename = sha1_file_name(request->obj->sha1);
 313         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 314         snprintf(request->tmpfile, sizeof(request->tmpfile),
 315                  "%s.temp", filename);
 316
 317         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 318         unlink_or_warn(prevfile);
 319         rename(request->tmpfile, prevfile);
 320         unlink_or_warn(request->tmpfile);
 321
 322         if (request->local_fileno != -1)
 323                 error("fd leakage in start: %d", request->local_fileno);
 324         request->local_fileno = open(request->tmpfile,
 325                                      O_WRONLY | O_CREAT | O_EXCL, 0666);
 326         /*
 327          * This could have failed due to the "lazy directory creation";
 328          * try to mkdir the last path component.
 329          */
 330         if (request->local_fileno < 0 && errno == ENOENT) {
 331                 char *dir = strrchr(request->tmpfile, '/');
 332                 if (dir) {
 333                         *dir = 0;
 334                         mkdir(request->tmpfile, 0777);
 335                         *dir = '/';
 336                 }
 337                 request->local_fileno = open(request->tmpfile,
 338                                              O_WRONLY | O_CREAT | O_EXCL, 0666);
 339         }
 340
 341         if (request->local_fileno < 0) {
 342                 request->state = ABORTED;
 343                 error("Couldn't create temporary file %s for %s: %s",
 344                       request->tmpfile, request->filename, strerror(errno));
 345                 return;
 346         }
 347
 348         memset(&request->stream, 0, sizeof(request->stream));
 349
 350         git_inflate_init(&request->stream);
 351
 352         git_SHA1_Init(&request->c);
 353
 354         url = get_remote_object_url(repo->url, hex, 0);
 355         request->url = xstrdup(url);
 356
 357         /*
 358          * If a previous temp file is present, process what was already
 359          * fetched.
 360          */
 361         prevlocal = open(prevfile, O_RDONLY);
 362         if (prevlocal != -1) {
 363                 do {
 364                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
 365                         if (prev_read>0) {
 366                                 if (fwrite_sha1_file(prev_buf,
 367                                                      1,
 368                                                      prev_read,
 369                                                      request) == prev_read)
 370                                         prev_posn += prev_read;
 371                                 else
 372                                         prev_read = -1;
 373                         }
 374                 } while (prev_read > 0);
 375                 close(prevlocal);
 376         }
 377         unlink_or_warn(prevfile);
 378
 379         /*
 380          * Reset inflate/SHA1 if there was an error reading the previous temp
 381          * file; also rewind to the beginning of the local file.
 382          */
 383         if (prev_read == -1) {
 384                 memset(&request->stream, 0, sizeof(request->stream));
 385                 git_inflate_init(&request->stream);
 386                 git_SHA1_Init(&request->c);
 387                 if (prev_posn>0) {
 388                         prev_posn = 0;
 389                         lseek(request->local_fileno, 0, SEEK_SET);
 390                         ftruncate(request->local_fileno, 0);
 391                 }
 392         }
 393
 394         slot = get_active_slot();
 395         slot->callback_func = process_response;
 396         slot->callback_data = request;
 397         request->slot = slot;
 398
 399         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 400         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 401         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 402         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 403         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 404
 405         /*
 406          * If we have successfully processed data from a previous fetch
 407          * attempt, only fetch the data we don't already have.
 408          */
 409         if (prev_posn>0) {
 410                 if (push_verbosely)
 411                         fprintf(stderr,
 412                                 "Resuming fetch of object %s at byte %ld\n",
 413                                 hex, prev_posn);
 414                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 415                 range_header = curl_slist_append(range_header, range);
 416                 curl_easy_setopt(slot->curl,
 417                                  CURLOPT_HTTPHEADER, range_header);
 418         }
 419
 420         /* Try to get the request started, abort the request on error */
 421         request->state = RUN_FETCH_LOOSE;
 422         if (!start_active_slot(slot)) {
 423                 fprintf(stderr, "Unable to start GET request\n");
 424                 repo->can_update_info_refs = 0;
 425                 release_request(request);
 426         }
 427 }
 428
 429 static void start_mkcol(struct transfer_request *request)
 430 {
 431         char *hex = sha1_to_hex(request->obj->sha1);
 432         struct active_request_slot *slot;
 433
 434         request->url = get_remote_object_url(repo->url, hex, 1);
 435
 436         slot = get_active_slot();
 437         slot->callback_func = process_response;
 438         slot->callback_data = request;
 439         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 440         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 441         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 442         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
 443         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 444
 445         if (start_active_slot(slot)) {
 446                 request->slot = slot;
 447                 request->state = RUN_MKCOL;
 448         } else {
 449                 request->state = ABORTED;
 450                 free(request->url);
 451                 request->url = NULL;
 452         }
 453 }
 454 #endif
 455
 456 static void start_fetch_packed(struct transfer_request *request)
 457 {
 458         char *url;
 459         struct packed_git *target;
 460         FILE *packfile;
 461         char *filename;
 462         long prev_posn = 0;
 463         char range[RANGE_HEADER_SIZE];
 464         struct curl_slist *range_header = NULL;
 465
 466         struct transfer_request *check_request = request_queue_head;
 467         struct active_request_slot *slot;
 468
 469         target = find_sha1_pack(request->obj->sha1, repo->packs);
 470         if (!target) {
 471                 fprintf(stderr, "Unable to fetch %s, will not be able to update server info refs\n", sha1_to_hex(request->obj->sha1));
 472                 repo->can_update_info_refs = 0;
 473                 release_request(request);
 474                 return;
 475         }
 476
 477         fprintf(stderr, "Fetching pack %s\n", sha1_to_hex(target->sha1));
 478         fprintf(stderr, " which contains %s\n", sha1_to_hex(request->obj->sha1));
 479
 480         filename = sha1_pack_name(target->sha1);
 481         snprintf(request->filename, sizeof(request->filename), "%s", filename);
 482         snprintf(request->tmpfile, sizeof(request->tmpfile),
 483                  "%s.temp", filename);
 484
 485         url = xmalloc(strlen(repo->url) + 64);
 486         sprintf(url, "%sobjects/pack/pack-%s.pack",
 487                 repo->url, sha1_to_hex(target->sha1));
 488
 489         /* Make sure there isn't another open request for this pack */
 490         while (check_request) {
 491                 if (check_request->state == RUN_FETCH_PACKED &&
 492                     !strcmp(check_request->url, url)) {
 493                         free(url);
 494                         release_request(request);
 495                         return;
 496                 }
 497                 check_request = check_request->next;
 498         }
 499
 500         packfile = fopen(request->tmpfile, "a");
 501         if (!packfile) {
 502                 fprintf(stderr, "Unable to open local file %s for pack",
 503                         request->tmpfile);
 504                 repo->can_update_info_refs = 0;
 505                 free(url);
 506                 return;
 507         }
 508
 509         slot = get_active_slot();
 510         slot->callback_func = process_response;
 511         slot->callback_data = request;
 512         request->slot = slot;
 513         request->local_stream = packfile;
 514         request->userData = target;
 515
 516         request->url = url;
 517         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
 518         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 519         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 520         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 521         slot->local = packfile;
 522
 523         /*
 524          * If there is data present from a previous transfer attempt,
 525          * resume where it left off
 526          */
 527         prev_posn = ftell(packfile);
 528         if (prev_posn>0) {
 529                 if (push_verbosely)
 530                         fprintf(stderr,
 531                                 "Resuming fetch of pack %s at byte %ld\n",
 532                                 sha1_to_hex(target->sha1), prev_posn);
 533                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 534                 range_header = curl_slist_append(range_header, range);
 535                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 536         }
 537
 538         /* Try to get the request started, abort the request on error */
 539         request->state = RUN_FETCH_PACKED;
 540         if (!start_active_slot(slot)) {
 541                 fprintf(stderr, "Unable to start GET request\n");
 542                 repo->can_update_info_refs = 0;
 543                 release_request(request);
 544         }
 545 }
 546
 547 static void start_put(struct transfer_request *request)
 548 {
 549         char *hex = sha1_to_hex(request->obj->sha1);
 550         struct active_request_slot *slot;
 551         struct strbuf buf = STRBUF_INIT;
 552         enum object_type type;
 553         char hdr[50];
 554         void *unpacked;
 555         unsigned long len;
 556         int hdrlen;
 557         ssize_t size;
 558         z_stream stream;
 559
 560         unpacked = read_sha1_file(request->obj->sha1, &type, &len);
 561         hdrlen = sprintf(hdr, "%s %lu", typename(type), len) + 1;
 562
 563         /* Set it up */
 564         memset(&stream, 0, sizeof(stream));
 565         deflateInit(&stream, zlib_compression_level);
 566         size = deflateBound(&stream, len + hdrlen);
 567         strbuf_init(&request->buffer.buf, size);
 568         request->buffer.posn = 0;
 569
 570         /* Compress it */
 571         stream.next_out = (unsigned char *)request->buffer.buf.buf;
 572         stream.avail_out = size;
 573
 574         /* First header.. */
 575         stream.next_in = (void *)hdr;
 576         stream.avail_in = hdrlen;
 577         while (deflate(&stream, 0) == Z_OK)
 578                 /* nothing */;
 579
 580         /* Then the data itself.. */
 581         stream.next_in = unpacked;
 582         stream.avail_in = len;
 583         while (deflate(&stream, Z_FINISH) == Z_OK)
 584                 /* nothing */;
 585         deflateEnd(&stream);
 586         free(unpacked);
 587
 588         request->buffer.buf.len = stream.total_out;
 589
 590         strbuf_addstr(&buf, "Destination: ");
 591         append_remote_object_url(&buf, repo->url, hex, 0);
 592         request->dest = strbuf_detach(&buf, NULL);
 593
 594         append_remote_object_url(&buf, repo->url, hex, 0);
 595         strbuf_add(&buf, request->lock->tmpfile_suffix, 41);
 596         request->url = strbuf_detach(&buf, NULL);
 597
 598         slot = get_active_slot();
 599         slot->callback_func = process_response;
 600         slot->callback_data = request;
 601         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &request->buffer);
 602         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, request->buffer.buf.len);
 603         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
 604 #ifndef NO_CURL_IOCTL
 605         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
 606         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &request->buffer);
 607 #endif
 608         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 609         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
 610         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
 611         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
 612         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 613         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 614
 615         if (start_active_slot(slot)) {
 616                 request->slot = slot;
 617                 request->state = RUN_PUT;
 618         } else {
 619                 request->state = ABORTED;
 620                 free(request->url);
 621                 request->url = NULL;
 622         }
 623 }
 624
 625 static void start_move(struct transfer_request *request)
 626 {
 627         struct active_request_slot *slot;
 628         struct curl_slist *dav_headers = NULL;
 629
 630         slot = get_active_slot();
 631         slot->callback_func = process_response;
 632         slot->callback_data = request;
 633         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1); /* undo PUT setup */
 634         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MOVE);
 635         dav_headers = curl_slist_append(dav_headers, request->dest);
 636         dav_headers = curl_slist_append(dav_headers, "Overwrite: T");
 637         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 638         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 639         curl_easy_setopt(slot->curl, CURLOPT_URL, request->url);
 640
 641         if (start_active_slot(slot)) {
 642                 request->slot = slot;
 643                 request->state = RUN_MOVE;
 644         } else {
 645                 request->state = ABORTED;
 646                 free(request->url);
 647                 request->url = NULL;
 648         }
 649 }
 650
 651 static int refresh_lock(struct remote_lock *lock)
 652 {
 653         struct active_request_slot *slot;
 654         struct slot_results results;
 655         struct curl_slist *dav_headers;
 656         int rc = 0;
 657
 658         lock->refreshing = 1;
 659
 660         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF | DAV_HEADER_TIMEOUT);
 661
 662         slot = get_active_slot();
 663         slot->results = &results;
 664         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 665         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
 666         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
 667         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
 668         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
 669
 670         if (start_active_slot(slot)) {
 671                 run_active_slot(slot);
 672                 if (results.curl_result != CURLE_OK) {
 673                         fprintf(stderr, "LOCK HTTP error %ld\n",
 674                                 results.http_code);
 675                 } else {
 676                         lock->start_time = time(NULL);
 677                         rc = 1;
 678                 }
 679         }
 680
 681         lock->refreshing = 0;
 682         curl_slist_free_all(dav_headers);
 683
 684         return rc;
 685 }
 686
 687 static void check_locks(void)
 688 {
 689         struct remote_lock *lock = repo->locks;
 690         time_t current_time = time(NULL);
 691         int time_remaining;
 692
 693         while (lock) {
 694                 time_remaining = lock->start_time + lock->timeout -
 695                         current_time;
 696                 if (!lock->refreshing && time_remaining < LOCK_REFRESH) {
 697                         if (!refresh_lock(lock)) {
 698                                 fprintf(stderr,
 699                                         "Unable to refresh lock for %s\n",
 700                                         lock->url);
 701                                 aborted = 1;
 702                                 return;
 703                         }
 704                 }
 705                 lock = lock->next;
 706         }
 707 }
 708
 709 static void release_request(struct transfer_request *request)
 710 {
 711         struct transfer_request *entry = request_queue_head;
 712
 713         if (request == request_queue_head) {
 714                 request_queue_head = request->next;
 715         } else {
 716                 while (entry->next != NULL && entry->next != request)
 717                         entry = entry->next;
 718                 if (entry->next == request)
 719                         entry->next = entry->next->next;
 720         }
 721
 722         if (request->local_fileno != -1)
 723                 close(request->local_fileno);
 724         if (request->local_stream)
 725                 fclose(request->local_stream);
 726         free(request->url);
 727         free(request);
 728 }
 729
 730 static void finish_request(struct transfer_request *request)
 731 {
 732         struct stat st;
 733         struct packed_git *target;
 734         struct packed_git **lst;
 735         struct active_request_slot *slot;
 736
 737         request->curl_result = request->slot->curl_result;
 738         request->http_code = request->slot->http_code;
 739         slot = request->slot;
 740         request->slot = NULL;
 741
 742         /* Keep locks active */
 743         check_locks();
 744
 745         if (request->headers != NULL)
 746                 curl_slist_free_all(request->headers);
 747
 748         /* URL is reused for MOVE after PUT */
 749         if (request->state != RUN_PUT) {
 750                 free(request->url);
 751                 request->url = NULL;
 752         }
 753
 754         if (request->state == RUN_MKCOL) {
 755                 if (request->curl_result == CURLE_OK ||
 756                     request->http_code == 405) {
 757                         remote_dir_exists[request->obj->sha1[0]] = 1;
 758                         start_put(request);
 759                 } else {
 760                         fprintf(stderr, "MKCOL %s failed, aborting (%d/%ld)\n",
 761                                 sha1_to_hex(request->obj->sha1),
 762                                 request->curl_result, request->http_code);
 763                         request->state = ABORTED;
 764                         aborted = 1;
 765                 }
 766         } else if (request->state == RUN_PUT) {
 767                 if (request->curl_result == CURLE_OK) {
 768                         start_move(request);
 769                 } else {
 770                         fprintf(stderr, "PUT %s failed, aborting (%d/%ld)\n",
 771                                 sha1_to_hex(request->obj->sha1),
 772                                 request->curl_result, request->http_code);
 773                         request->state = ABORTED;
 774                         aborted = 1;
 775                 }
 776         } else if (request->state == RUN_MOVE) {
 777                 if (request->curl_result == CURLE_OK) {
 778                         if (push_verbosely)
 779                                 fprintf(stderr, "    sent %s\n",
 780                                         sha1_to_hex(request->obj->sha1));
 781                         request->obj->flags |= REMOTE;
 782                         release_request(request);
 783                 } else {
 784                         fprintf(stderr, "MOVE %s failed, aborting (%d/%ld)\n",
 785                                 sha1_to_hex(request->obj->sha1),
 786                                 request->curl_result, request->http_code);
 787                         request->state = ABORTED;
 788                         aborted = 1;
 789                 }
 790         } else if (request->state == RUN_FETCH_LOOSE) {
 791                 close(request->local_fileno);
 792                 request->local_fileno = -1;
 793
 794                 if (request->curl_result != CURLE_OK &&
 795                     request->http_code != 416) {
 796                         if (stat(request->tmpfile, &st) == 0) {
 797                                 if (st.st_size == 0)
 798                                         unlink_or_warn(request->tmpfile);
 799                         }
 800                 } else {
 801                         if (request->http_code == 416)
 802                                 warning("requested range invalid; we may already have all the data.");
 803
 804                         git_inflate_end(&request->stream);
 805                         git_SHA1_Final(request->real_sha1, &request->c);
 806                         if (request->zret != Z_STREAM_END) {
 807                                 unlink_or_warn(request->tmpfile);
 808                         } else if (hashcmp(request->obj->sha1, request->real_sha1)) {
 809                                 unlink_or_warn(request->tmpfile);
 810                         } else {
 811                                 request->rename =
 812                                         move_temp_to_file(
 813                                                 request->tmpfile,
 814                                                 request->filename);
 815                                 if (request->rename == 0)
 816                                         request->obj->flags |= (LOCAL | REMOTE);
 817                         }
 818                 }
 819
 820                 /* Try fetching packed if necessary */
 821                 if (request->obj->flags & LOCAL)
 822                         release_request(request);
 823                 else
 824                         start_fetch_packed(request);
 825
 826         } else if (request->state == RUN_FETCH_PACKED) {
 827                 if (request->curl_result != CURLE_OK) {
 828                         fprintf(stderr, "Unable to get pack file %s\n%s",
 829                                 request->url, curl_errorstr);
 830                         repo->can_update_info_refs = 0;
 831                 } else {
 832                         off_t pack_size = ftell(request->local_stream);
 833
 834                         fclose(request->local_stream);
 835                         request->local_stream = NULL;
 836                         slot->local = NULL;
 837                         if (!move_temp_to_file(request->tmpfile,
 838                                                request->filename)) {
 839                                 target = (struct packed_git *)request->userData;
 840                                 target->pack_size = pack_size;
 841                                 lst = &repo->packs;
 842                                 while (*lst != target)
 843                                         lst = &((*lst)->next);
 844                                 *lst = (*lst)->next;
 845
 846                                 if (!verify_pack(target))
 847                                         install_packed_git(target);
 848                                 else
 849                                         repo->can_update_info_refs = 0;
 850                         }
 851                 }
 852                 release_request(request);
 853         }
 854 }
 855
 856 #ifdef USE_CURL_MULTI
 857 static int is_running_queue;
 858 static int fill_active_slot(void *unused)
 859 {
 860         struct transfer_request *request;
 861
 862         if (aborted || !is_running_queue)
 863                 return 0;
 864
 865         for (request = request_queue_head; request; request = request->next) {
 866                 if (request->state == NEED_FETCH) {
 867                         start_fetch_loose(request);
 868                         return 1;
 869                 } else if (pushing && request->state == NEED_PUSH) {
 870                         if (remote_dir_exists[request->obj->sha1[0]] == 1) {
 871                                 start_put(request);
 872                         } else {
 873                                 start_mkcol(request);
 874                         }
 875                         return 1;
 876                 }
 877         }
 878         return 0;
 879 }
 880 #endif
 881
 882 static void get_remote_object_list(unsigned char parent);
 883
 884 static void add_fetch_request(struct object *obj)
 885 {
 886         struct transfer_request *request;
 887
 888         check_locks();
 889
 890         /*
 891          * Don't fetch the object if it's known to exist locally
 892          * or is already in the request queue
 893          */
 894         if (remote_dir_exists[obj->sha1[0]] == -1)
 895                 get_remote_object_list(obj->sha1[0]);
 896         if (obj->flags & (LOCAL | FETCHING))
 897                 return;
 898
 899         obj->flags |= FETCHING;
 900         request = xmalloc(sizeof(*request));
 901         request->obj = obj;
 902         request->url = NULL;
 903         request->lock = NULL;
 904         request->headers = NULL;
 905         request->local_fileno = -1;
 906         request->local_stream = NULL;
 907         request->state = NEED_FETCH;
 908         request->next = request_queue_head;
 909         request_queue_head = request;
 910
 911 #ifdef USE_CURL_MULTI
 912         fill_active_slots();
 913         step_active_slots();
 914 #endif
 915 }
 916
 917 static int add_send_request(struct object *obj, struct remote_lock *lock)
 918 {
 919         struct transfer_request *request = request_queue_head;
 920         struct packed_git *target;
 921
 922         /* Keep locks active */
 923         check_locks();
 924
 925         /*
 926          * Don't push the object if it's known to exist on the remote
 927          * or is already in the request queue
 928          */
 929         if (remote_dir_exists[obj->sha1[0]] == -1)
 930                 get_remote_object_list(obj->sha1[0]);
 931         if (obj->flags & (REMOTE | PUSHING))
 932                 return 0;
 933         target = find_sha1_pack(obj->sha1, repo->packs);
 934         if (target) {
 935                 obj->flags |= REMOTE;
 936                 return 0;
 937         }
 938
 939         obj->flags |= PUSHING;
 940         request = xmalloc(sizeof(*request));
 941         request->obj = obj;
 942         request->url = NULL;
 943         request->lock = lock;
 944         request->headers = NULL;
 945         request->local_fileno = -1;
 946         request->local_stream = NULL;
 947         request->state = NEED_PUSH;
 948         request->next = request_queue_head;
 949         request_queue_head = request;
 950
 951 #ifdef USE_CURL_MULTI
 952         fill_active_slots();
 953         step_active_slots();
 954 #endif
 955
 956         return 1;
 957 }
 958
 959 static int fetch_index(unsigned char *sha1)
 960 {
 961         char *hex = sha1_to_hex(sha1);
 962         char *filename;
 963         char *url;
 964         char tmpfile[PATH_MAX];
 965         long prev_posn = 0;
 966         char range[RANGE_HEADER_SIZE];
 967         struct curl_slist *range_header = NULL;
 968
 969         FILE *indexfile;
 970         struct active_request_slot *slot;
 971         struct slot_results results;
 972
 973         /* Don't use the index if the pack isn't there */
 974         url = xmalloc(strlen(repo->url) + 64);
 975         sprintf(url, "%sobjects/pack/pack-%s.pack", repo->url, hex);
 976         slot = get_active_slot();
 977         slot->results = &results;
 978         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 979         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 980         if (start_active_slot(slot)) {
 981                 run_active_slot(slot);
 982                 if (results.curl_result != CURLE_OK) {
 983                         free(url);
 984                         return error("Unable to verify pack %s is available",
 985                                      hex);
 986                 }
 987         } else {
 988                 free(url);
 989                 return error("Unable to start request");
 990         }
 991
 992         if (has_pack_index(sha1)) {
 993                 free(url);
 994                 return 0;
 995         }
 996
 997         if (push_verbosely)
 998                 fprintf(stderr, "Getting index for pack %s\n", hex);
 999
1000         sprintf(url, "%sobjects/pack/pack-%s.idx", repo->url, hex);
1001
1002         filename = sha1_pack_index_name(sha1);
1003         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
1004         indexfile = fopen(tmpfile, "a");
1005         if (!indexfile) {
1006                 free(url);
1007                 return error("Unable to open local file %s for pack index",
1008                              tmpfile);
1009         }
1010
1011         slot = get_active_slot();
1012         slot->results = &results;
1013         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1014         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1015         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
1016         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1017         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1018         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1019         slot->local = indexfile;
1020
1021         /*
1022          * If there is data present from a previous transfer attempt,
1023          * resume where it left off
1024          */
1025         prev_posn = ftell(indexfile);
1026         if (prev_posn>0) {
1027                 if (push_verbosely)
1028                         fprintf(stderr,
1029                                 "Resuming fetch of index for pack %s at byte %ld\n",
1030                                 hex, prev_posn);
1031                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1032                 range_header = curl_slist_append(range_header, range);
1033                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
1034         }
1035
1036         if (start_active_slot(slot)) {
1037                 run_active_slot(slot);
1038                 if (results.curl_result != CURLE_OK) {
1039                         free(url);
1040                         fclose(indexfile);
1041                         slot->local = NULL;
1042                         return error("Unable to get pack index %s\n%s", url,
1043                                      curl_errorstr);
1044                 }
1045         } else {
1046                 free(url);
1047                 fclose(indexfile);
1048                 slot->local = NULL;
1049                 return error("Unable to start request");
1050         }
1051
1052         free(url);
1053         fclose(indexfile);
1054         slot->local = NULL;
1055
1056         return move_temp_to_file(tmpfile, filename);
1057 }
1058
1059 static int setup_index(unsigned char *sha1)
1060 {
1061         struct packed_git *new_pack;
1062
1063         if (fetch_index(sha1))
1064                 return -1;
1065
1066         new_pack = parse_pack_index(sha1);
1067         new_pack->next = repo->packs;
1068         repo->packs = new_pack;
1069         return 0;
1070 }
1071
1072 static int fetch_indices(void)
1073 {
1074         unsigned char sha1[20];
1075         char *url;
1076         struct strbuf buffer = STRBUF_INIT;
1077         char *data;
1078         int i = 0;
1079
1080         struct active_request_slot *slot;
1081         struct slot_results results;
1082
1083         if (push_verbosely)
1084                 fprintf(stderr, "Getting pack list\n");
1085
1086         url = xmalloc(strlen(repo->url) + 20);
1087         sprintf(url, "%sobjects/info/packs", repo->url);
1088
1089         slot = get_active_slot();
1090         slot->results = &results;
1091         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1092         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1093         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1094         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1095         if (start_active_slot(slot)) {
1096                 run_active_slot(slot);
1097                 if (results.curl_result != CURLE_OK) {
1098                         strbuf_release(&buffer);
1099                         free(url);
1100                         if (results.http_code == 404)
1101                                 return 0;
1102                         else
1103                                 return error("%s", curl_errorstr);
1104                 }
1105         } else {
1106                 strbuf_release(&buffer);
1107                 free(url);
1108                 return error("Unable to start request");
1109         }
1110         free(url);
1111
1112         data = buffer.buf;
1113         while (i < buffer.len) {
1114                 switch (data[i]) {
1115                 case 'P':
1116                         i++;
1117                         if (i + 52 < buffer.len &&
1118                             !prefixcmp(data + i, " pack-") &&
1119                             !prefixcmp(data + i + 46, ".pack\n")) {
1120                                 get_sha1_hex(data + i + 6, sha1);
1121                                 setup_index(sha1);
1122                                 i += 51;
1123                                 break;
1124                         }
1125                 default:
1126                         while (data[i] != '\n')
1127                                 i++;
1128                 }
1129                 i++;
1130         }
1131
1132         strbuf_release(&buffer);
1133         return 0;
1134 }
1135
1136 static void one_remote_object(const char *hex)
1137 {
1138         unsigned char sha1[20];
1139         struct object *obj;
1140
1141         if (get_sha1_hex(hex, sha1) != 0)
1142                 return;
1143
1144         obj = lookup_object(sha1);
1145         if (!obj)
1146                 obj = parse_object(sha1);
1147
1148         /* Ignore remote objects that don't exist locally */
1149         if (!obj)
1150                 return;
1151
1152         obj->flags |= REMOTE;
1153         if (!object_list_contains(objects, obj))
1154                 object_list_insert(obj, &objects);
1155 }
1156
1157 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1158 {
1159         int *lock_flags = (int *)ctx->userData;
1160
1161         if (tag_closed) {
1162                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1163                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1164                             (*lock_flags & DAV_PROP_LOCKWR)) {
1165                                 *lock_flags |= DAV_LOCK_OK;
1166                         }
1167                         *lock_flags &= DAV_LOCK_OK;
1168                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1169                         *lock_flags |= DAV_PROP_LOCKWR;
1170                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1171                         *lock_flags |= DAV_PROP_LOCKEX;
1172                 }
1173         }
1174 }
1175
1176 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1177 {
1178         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1179         git_SHA_CTX sha_ctx;
1180         unsigned char lock_token_sha1[20];
1181
1182         if (tag_closed && ctx->cdata) {
1183                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1184                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1185                         strcpy(lock->owner, ctx->cdata);
1186                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1187                         if (!prefixcmp(ctx->cdata, "Second-"))
1188                                 lock->timeout =
1189                                         strtol(ctx->cdata + 7, NULL, 10);
1190                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1191                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1192                         strcpy(lock->token, ctx->cdata);
1193
1194                         git_SHA1_Init(&sha_ctx);
1195                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1196                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
1197
1198                         lock->tmpfile_suffix[0] = '_';
1199                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1200                 }
1201         }
1202 }
1203
1204 static void one_remote_ref(char *refname);
1205
1206 static void
1207 xml_start_tag(void *userData, const char *name, const char **atts)
1208 {
1209         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1210         const char *c = strchr(name, ':');
1211         int new_len;
1212
1213         if (c == NULL)
1214                 c = name;
1215         else
1216                 c++;
1217
1218         new_len = strlen(ctx->name) + strlen(c) + 2;
1219
1220         if (new_len > ctx->len) {
1221                 ctx->name = xrealloc(ctx->name, new_len);
1222                 ctx->len = new_len;
1223         }
1224         strcat(ctx->name, ".");
1225         strcat(ctx->name, c);
1226
1227         free(ctx->cdata);
1228         ctx->cdata = NULL;
1229
1230         ctx->userFunc(ctx, 0);
1231 }
1232
1233 static void
1234 xml_end_tag(void *userData, const char *name)
1235 {
1236         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1237         const char *c = strchr(name, ':');
1238         char *ep;
1239
1240         ctx->userFunc(ctx, 1);
1241
1242         if (c == NULL)
1243                 c = name;
1244         else
1245                 c++;
1246
1247         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1248         *ep = 0;
1249 }
1250
1251 static void
1252 xml_cdata(void *userData, const XML_Char *s, int len)
1253 {
1254         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1255         free(ctx->cdata);
1256         ctx->cdata = xmemdupz(s, len);
1257 }
1258
1259 static struct remote_lock *lock_remote(const char *path, long timeout)
1260 {
1261         struct active_request_slot *slot;
1262         struct slot_results results;
1263         struct buffer out_buffer = { STRBUF_INIT, 0 };
1264         struct strbuf in_buffer = STRBUF_INIT;
1265         char *url;
1266         char *ep;
1267         char timeout_header[25];
1268         struct remote_lock *lock = NULL;
1269         struct curl_slist *dav_headers = NULL;
1270         struct xml_ctx ctx;
1271         char *escaped;
1272
1273         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1274         sprintf(url, "%s%s", repo->url, path);
1275
1276         /* Make sure leading directories exist for the remote ref */
1277         ep = strchr(url + strlen(repo->url) + 1, '/');
1278         while (ep) {
1279                 char saved_character = ep[1];
1280                 ep[1] = '\0';
1281                 slot = get_active_slot();
1282                 slot->results = &results;
1283                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1284                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1285                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1286                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1287                 if (start_active_slot(slot)) {
1288                         run_active_slot(slot);
1289                         if (results.curl_result != CURLE_OK &&
1290                             results.http_code != 405) {
1291                                 fprintf(stderr,
1292                                         "Unable to create branch path %s\n",
1293                                         url);
1294                                 free(url);
1295                                 return NULL;
1296                         }
1297                 } else {
1298                         fprintf(stderr, "Unable to start MKCOL request\n");
1299                         free(url);
1300                         return NULL;
1301                 }
1302                 ep[1] = saved_character;
1303                 ep = strchr(ep + 1, '/');
1304         }
1305
1306         escaped = xml_entities(git_default_email);
1307         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
1308         free(escaped);
1309
1310         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1311         dav_headers = curl_slist_append(dav_headers, timeout_header);
1312         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1313
1314         slot = get_active_slot();
1315         slot->results = &results;
1316         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1317         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1318         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1319 #ifndef NO_CURL_IOCTL
1320         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1321         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1322 #endif
1323         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1324         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1325         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1326         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1327         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1328         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1329
1330         lock = xcalloc(1, sizeof(*lock));
1331         lock->timeout = -1;
1332
1333         if (start_active_slot(slot)) {
1334                 run_active_slot(slot);
1335                 if (results.curl_result == CURLE_OK) {
1336                         XML_Parser parser = XML_ParserCreate(NULL);
1337                         enum XML_Status result;
1338                         ctx.name = xcalloc(10, 1);
1339                         ctx.len = 0;
1340                         ctx.cdata = NULL;
1341                         ctx.userFunc = handle_new_lock_ctx;
1342                         ctx.userData = lock;
1343                         XML_SetUserData(parser, &ctx);
1344                         XML_SetElementHandler(parser, xml_start_tag,
1345                                               xml_end_tag);
1346                         XML_SetCharacterDataHandler(parser, xml_cdata);
1347                         result = XML_Parse(parser, in_buffer.buf,
1348                                            in_buffer.len, 1);
1349                         free(ctx.name);
1350                         if (result != XML_STATUS_OK) {
1351                                 fprintf(stderr, "XML error: %s\n",
1352                                         XML_ErrorString(
1353                                                 XML_GetErrorCode(parser)));
1354                                 lock->timeout = -1;
1355                         }
1356                         XML_ParserFree(parser);
1357                 }
1358         } else {
1359                 fprintf(stderr, "Unable to start LOCK request\n");
1360         }
1361
1362         curl_slist_free_all(dav_headers);
1363         strbuf_release(&out_buffer.buf);
1364         strbuf_release(&in_buffer);
1365
1366         if (lock->token == NULL || lock->timeout <= 0) {
1367                 free(lock->token);
1368                 free(lock->owner);
1369                 free(url);
1370                 free(lock);
1371                 lock = NULL;
1372         } else {
1373                 lock->url = url;
1374                 lock->start_time = time(NULL);
1375                 lock->next = repo->locks;
1376                 repo->locks = lock;
1377         }
1378
1379         return lock;
1380 }
1381
1382 static int unlock_remote(struct remote_lock *lock)
1383 {
1384         struct active_request_slot *slot;
1385         struct slot_results results;
1386         struct remote_lock *prev = repo->locks;
1387         struct curl_slist *dav_headers;
1388         int rc = 0;
1389
1390         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1391
1392         slot = get_active_slot();
1393         slot->results = &results;
1394         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1395         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1396         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1397         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1398
1399         if (start_active_slot(slot)) {
1400                 run_active_slot(slot);
1401                 if (results.curl_result == CURLE_OK)
1402                         rc = 1;
1403                 else
1404                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1405                                 results.http_code);
1406         } else {
1407                 fprintf(stderr, "Unable to start UNLOCK request\n");
1408         }
1409
1410         curl_slist_free_all(dav_headers);
1411
1412         if (repo->locks == lock) {
1413                 repo->locks = lock->next;
1414         } else {
1415                 while (prev && prev->next != lock)
1416                         prev = prev->next;
1417                 if (prev)
1418                         prev->next = prev->next->next;
1419         }
1420
1421         free(lock->owner);
1422         free(lock->url);
1423         free(lock->token);
1424         free(lock);
1425
1426         return rc;
1427 }
1428
1429 static void remove_locks(void)
1430 {
1431         struct remote_lock *lock = repo->locks;
1432
1433         fprintf(stderr, "Removing remote locks...\n");
1434         while (lock) {
1435                 unlock_remote(lock);
1436                 lock = lock->next;
1437         }
1438 }
1439
1440 static void remove_locks_on_signal(int signo)
1441 {
1442         remove_locks();
1443         sigchain_pop(signo);
1444         raise(signo);
1445 }
1446
1447 static void remote_ls(const char *path, int flags,
1448                       void (*userFunc)(struct remote_ls_ctx *ls),
1449                       void *userData);
1450
1451 static void process_ls_object(struct remote_ls_ctx *ls)
1452 {
1453         unsigned int *parent = (unsigned int *)ls->userData;
1454         char *path = ls->dentry_name;
1455         char *obj_hex;
1456
1457         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1458                 remote_dir_exists[*parent] = 1;
1459                 return;
1460         }
1461
1462         if (strlen(path) != 49)
1463                 return;
1464         path += 8;
1465         obj_hex = xmalloc(strlen(path));
1466         /* NB: path is not null-terminated, can not use strlcpy here */
1467         memcpy(obj_hex, path, 2);
1468         strcpy(obj_hex + 2, path + 3);
1469         one_remote_object(obj_hex);
1470         free(obj_hex);
1471 }
1472
1473 static void process_ls_ref(struct remote_ls_ctx *ls)
1474 {
1475         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1476                 fprintf(stderr, "  %s\n", ls->dentry_name);
1477                 return;
1478         }
1479
1480         if (!(ls->dentry_flags & IS_DIR))
1481                 one_remote_ref(ls->dentry_name);
1482 }
1483
1484 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1485 {
1486         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1487
1488         if (tag_closed) {
1489                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1490                         if (ls->dentry_flags & IS_DIR) {
1491                                 if (ls->flags & PROCESS_DIRS) {
1492                                         ls->userFunc(ls);
1493                                 }
1494                                 if (strcmp(ls->dentry_name, ls->path) &&
1495                                     ls->flags & RECURSIVE) {
1496                                         remote_ls(ls->dentry_name,
1497                                                   ls->flags,
1498                                                   ls->userFunc,
1499                                                   ls->userData);
1500                                 }
1501                         } else if (ls->flags & PROCESS_FILES) {
1502                                 ls->userFunc(ls);
1503                         }
1504                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1505                         char *path = ctx->cdata;
1506                         if (*ctx->cdata == 'h') {
1507                                 path = strstr(path, "//");
1508                                 if (path) {
1509                                         path = strchr(path+2, '/');
1510                                 }
1511                         }
1512                         if (path) {
1513                                 path += repo->path_len;
1514                                 ls->dentry_name = xstrdup(path);
1515                         }
1516                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1517                         ls->dentry_flags |= IS_DIR;
1518                 }
1519         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1520                 free(ls->dentry_name);
1521                 ls->dentry_name = NULL;
1522                 ls->dentry_flags = 0;
1523         }
1524 }
1525
1526 /*
1527  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1528  * should _only_ heed the information from that file, instead of trying to
1529  * determine the refs from the remote file system (badly: it does not even
1530  * know about packed-refs).
1531  */
1532 static void remote_ls(const char *path, int flags,
1533                       void (*userFunc)(struct remote_ls_ctx *ls),
1534                       void *userData)
1535 {
1536         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1537         struct active_request_slot *slot;
1538         struct slot_results results;
1539         struct strbuf in_buffer = STRBUF_INIT;
1540         struct buffer out_buffer = { STRBUF_INIT, 0 };
1541         struct curl_slist *dav_headers = NULL;
1542         struct xml_ctx ctx;
1543         struct remote_ls_ctx ls;
1544
1545         ls.flags = flags;
1546         ls.path = xstrdup(path);
1547         ls.dentry_name = NULL;
1548         ls.dentry_flags = 0;
1549         ls.userData = userData;
1550         ls.userFunc = userFunc;
1551
1552         sprintf(url, "%s%s", repo->url, path);
1553
1554         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1555
1556         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1557         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1558
1559         slot = get_active_slot();
1560         slot->results = &results;
1561         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1562         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1563         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1564 #ifndef NO_CURL_IOCTL
1565         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1566         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1567 #endif
1568         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1569         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1570         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1571         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1572         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1573         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1574
1575         if (start_active_slot(slot)) {
1576                 run_active_slot(slot);
1577                 if (results.curl_result == CURLE_OK) {
1578                         XML_Parser parser = XML_ParserCreate(NULL);
1579                         enum XML_Status result;
1580                         ctx.name = xcalloc(10, 1);
1581                         ctx.len = 0;
1582                         ctx.cdata = NULL;
1583                         ctx.userFunc = handle_remote_ls_ctx;
1584                         ctx.userData = &ls;
1585                         XML_SetUserData(parser, &ctx);
1586                         XML_SetElementHandler(parser, xml_start_tag,
1587                                               xml_end_tag);
1588                         XML_SetCharacterDataHandler(parser, xml_cdata);
1589                         result = XML_Parse(parser, in_buffer.buf,
1590                                            in_buffer.len, 1);
1591                         free(ctx.name);
1592
1593                         if (result != XML_STATUS_OK) {
1594                                 fprintf(stderr, "XML error: %s\n",
1595                                         XML_ErrorString(
1596                                                 XML_GetErrorCode(parser)));
1597                         }
1598                         XML_ParserFree(parser);
1599                 }
1600         } else {
1601                 fprintf(stderr, "Unable to start PROPFIND request\n");
1602         }
1603
1604         free(ls.path);
1605         free(url);
1606         strbuf_release(&out_buffer.buf);
1607         strbuf_release(&in_buffer);
1608         curl_slist_free_all(dav_headers);
1609 }
1610
1611 static void get_remote_object_list(unsigned char parent)
1612 {
1613         char path[] = "objects/XX/";
1614         static const char hex[] = "0123456789abcdef";
1615         unsigned int val = parent;
1616
1617         path[8] = hex[val >> 4];
1618         path[9] = hex[val & 0xf];
1619         remote_dir_exists[val] = 0;
1620         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1621                   process_ls_object, &val);
1622 }
1623
1624 static int locking_available(void)
1625 {
1626         struct active_request_slot *slot;
1627         struct slot_results results;
1628         struct strbuf in_buffer = STRBUF_INIT;
1629         struct buffer out_buffer = { STRBUF_INIT, 0 };
1630         struct curl_slist *dav_headers = NULL;
1631         struct xml_ctx ctx;
1632         int lock_flags = 0;
1633         char *escaped;
1634
1635         escaped = xml_entities(repo->url);
1636         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1637         free(escaped);
1638
1639         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1640         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1641
1642         slot = get_active_slot();
1643         slot->results = &results;
1644         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1645         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1646         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1647 #ifndef NO_CURL_IOCTL
1648         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1649         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1650 #endif
1651         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1653         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1654         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1655         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1656         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1657
1658         if (start_active_slot(slot)) {
1659                 run_active_slot(slot);
1660                 if (results.curl_result == CURLE_OK) {
1661                         XML_Parser parser = XML_ParserCreate(NULL);
1662                         enum XML_Status result;
1663                         ctx.name = xcalloc(10, 1);
1664                         ctx.len = 0;
1665                         ctx.cdata = NULL;
1666                         ctx.userFunc = handle_lockprop_ctx;
1667                         ctx.userData = &lock_flags;
1668                         XML_SetUserData(parser, &ctx);
1669                         XML_SetElementHandler(parser, xml_start_tag,
1670                                               xml_end_tag);
1671                         result = XML_Parse(parser, in_buffer.buf,
1672                                            in_buffer.len, 1);
1673                         free(ctx.name);
1674
1675                         if (result != XML_STATUS_OK) {
1676                                 fprintf(stderr, "XML error: %s\n",
1677                                         XML_ErrorString(
1678                                                 XML_GetErrorCode(parser)));
1679                                 lock_flags = 0;
1680                         }
1681                         XML_ParserFree(parser);
1682                         if (!lock_flags)
1683                                 error("no DAV locking support on %s",
1684                                       repo->url);
1685
1686                 } else {
1687                         error("Cannot access URL %s, return code %d",
1688                               repo->url, results.curl_result);
1689                         lock_flags = 0;
1690                 }
1691         } else {
1692                 error("Unable to start PROPFIND request on %s", repo->url);
1693         }
1694
1695         strbuf_release(&out_buffer.buf);
1696         strbuf_release(&in_buffer);
1697         curl_slist_free_all(dav_headers);
1698
1699         return lock_flags;
1700 }
1701
1702 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1703 {
1704         struct object_list *entry = xmalloc(sizeof(struct object_list));
1705         entry->item = obj;
1706         entry->next = *p;
1707         *p = entry;
1708         return &entry->next;
1709 }
1710
1711 static struct object_list **process_blob(struct blob *blob,
1712                                          struct object_list **p,
1713                                          struct name_path *path,
1714                                          const char *name)
1715 {
1716         struct object *obj = &blob->object;
1717
1718         obj->flags |= LOCAL;
1719
1720         if (obj->flags & (UNINTERESTING | SEEN))
1721                 return p;
1722
1723         obj->flags |= SEEN;
1724         return add_one_object(obj, p);
1725 }
1726
1727 static struct object_list **process_tree(struct tree *tree,
1728                                          struct object_list **p,
1729                                          struct name_path *path,
1730                                          const char *name)
1731 {
1732         struct object *obj = &tree->object;
1733         struct tree_desc desc;
1734         struct name_entry entry;
1735         struct name_path me;
1736
1737         obj->flags |= LOCAL;
1738
1739         if (obj->flags & (UNINTERESTING | SEEN))
1740                 return p;
1741         if (parse_tree(tree) < 0)
1742                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1743
1744         obj->flags |= SEEN;
1745         name = xstrdup(name);
1746         p = add_one_object(obj, p);
1747         me.up = path;
1748         me.elem = name;
1749         me.elem_len = strlen(name);
1750
1751         init_tree_desc(&desc, tree->buffer, tree->size);
1752
1753         while (tree_entry(&desc, &entry))
1754                 switch (object_type(entry.mode)) {
1755                 case OBJ_TREE:
1756                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1757                         break;
1758                 case OBJ_BLOB:
1759                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1760                         break;
1761                 default:
1762                         /* Subproject commit - not in this repository */
1763                         break;
1764                 }
1765
1766         free(tree->buffer);
1767         tree->buffer = NULL;
1768         return p;
1769 }
1770
1771 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1772 {
1773         int i;
1774         struct commit *commit;
1775         struct object_list **p = &objects;
1776         int count = 0;
1777
1778         while ((commit = get_revision(revs)) != NULL) {
1779                 p = process_tree(commit->tree, p, NULL, "");
1780                 commit->object.flags |= LOCAL;
1781                 if (!(commit->object.flags & UNINTERESTING))
1782                         count += add_send_request(&commit->object, lock);
1783         }
1784
1785         for (i = 0; i < revs->pending.nr; i++) {
1786                 struct object_array_entry *entry = revs->pending.objects + i;
1787                 struct object *obj = entry->item;
1788                 const char *name = entry->name;
1789
1790                 if (obj->flags & (UNINTERESTING | SEEN))
1791                         continue;
1792                 if (obj->type == OBJ_TAG) {
1793                         obj->flags |= SEEN;
1794                         p = add_one_object(obj, p);
1795                         continue;
1796                 }
1797                 if (obj->type == OBJ_TREE) {
1798                         p = process_tree((struct tree *)obj, p, NULL, name);
1799                         continue;
1800                 }
1801                 if (obj->type == OBJ_BLOB) {
1802                         p = process_blob((struct blob *)obj, p, NULL, name);
1803                         continue;
1804                 }
1805                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1806         }
1807
1808         while (objects) {
1809                 if (!(objects->item->flags & UNINTERESTING))
1810                         count += add_send_request(objects->item, lock);
1811                 objects = objects->next;
1812         }
1813
1814         return count;
1815 }
1816
1817 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1818 {
1819         struct active_request_slot *slot;
1820         struct slot_results results;
1821         struct buffer out_buffer = { STRBUF_INIT, 0 };
1822         struct curl_slist *dav_headers;
1823
1824         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1825
1826         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1827
1828         slot = get_active_slot();
1829         slot->results = &results;
1830         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1831         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1832         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1833 #ifndef NO_CURL_IOCTL
1834         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1835         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1836 #endif
1837         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1838         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1839         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1840         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1841         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1842         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1843
1844         if (start_active_slot(slot)) {
1845                 run_active_slot(slot);
1846                 strbuf_release(&out_buffer.buf);
1847                 if (results.curl_result != CURLE_OK) {
1848                         fprintf(stderr,
1849                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1850                                 results.curl_result, results.http_code);
1851                         /* We should attempt recovery? */
1852                         return 0;
1853                 }
1854         } else {
1855                 strbuf_release(&out_buffer.buf);
1856                 fprintf(stderr, "Unable to start PUT request\n");
1857                 return 0;
1858         }
1859
1860         return 1;
1861 }
1862
1863 static struct ref *remote_refs, **remote_tail;
1864
1865 static void one_remote_ref(char *refname)
1866 {
1867         struct ref *ref;
1868         struct object *obj;
1869
1870         ref = alloc_ref(refname);
1871
1872         if (http_fetch_ref(repo->url, ref) != 0) {
1873                 fprintf(stderr,
1874                         "Unable to fetch ref %s from %s\n",
1875                         refname, repo->url);
1876                 free(ref);
1877                 return;
1878         }
1879
1880         /*
1881          * Fetch a copy of the object if it doesn't exist locally - it
1882          * may be required for updating server info later.
1883          */
1884         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1885                 obj = lookup_unknown_object(ref->old_sha1);
1886                 if (obj) {
1887                         fprintf(stderr, "  fetch %s for %s\n",
1888                                 sha1_to_hex(ref->old_sha1), refname);
1889                         add_fetch_request(obj);
1890                 }
1891         }
1892
1893         *remote_tail = ref;
1894         remote_tail = &ref->next;
1895 }
1896
1897 static void get_dav_remote_heads(void)
1898 {
1899         remote_tail = &remote_refs;
1900         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1901 }
1902
1903 static int is_zero_sha1(const unsigned char *sha1)
1904 {
1905         int i;
1906
1907         for (i = 0; i < 20; i++) {
1908                 if (*sha1++)
1909                         return 0;
1910         }
1911         return 1;
1912 }
1913
1914 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1915 {
1916         struct strbuf *buf = (struct strbuf *)ls->userData;
1917         struct object *o;
1918         int len;
1919         char *ref_info;
1920         struct ref *ref;
1921
1922         ref = alloc_ref(ls->dentry_name);
1923
1924         if (http_fetch_ref(repo->url, ref) != 0) {
1925                 fprintf(stderr,
1926                         "Unable to fetch ref %s from %s\n",
1927                         ls->dentry_name, repo->url);
1928                 aborted = 1;
1929                 free(ref);
1930                 return;
1931         }
1932
1933         o = parse_object(ref->old_sha1);
1934         if (!o) {
1935                 fprintf(stderr,
1936                         "Unable to parse object %s for remote ref %s\n",
1937                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1938                 aborted = 1;
1939                 free(ref);
1940                 return;
1941         }
1942
1943         len = strlen(ls->dentry_name) + 42;
1944         ref_info = xcalloc(len + 1, 1);
1945         sprintf(ref_info, "%s   %s\n",
1946                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1947         fwrite_buffer(ref_info, 1, len, buf);
1948         free(ref_info);
1949
1950         if (o->type == OBJ_TAG) {
1951                 o = deref_tag(o, ls->dentry_name, 0);
1952                 if (o) {
1953                         len = strlen(ls->dentry_name) + 45;
1954                         ref_info = xcalloc(len + 1, 1);
1955                         sprintf(ref_info, "%s   %s^{}\n",
1956                                 sha1_to_hex(o->sha1), ls->dentry_name);
1957                         fwrite_buffer(ref_info, 1, len, buf);
1958                         free(ref_info);
1959                 }
1960         }
1961         free(ref);
1962 }
1963
1964 static void update_remote_info_refs(struct remote_lock *lock)
1965 {
1966         struct buffer buffer = { STRBUF_INIT, 0 };
1967         struct active_request_slot *slot;
1968         struct slot_results results;
1969         struct curl_slist *dav_headers;
1970
1971         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1972                   add_remote_info_ref, &buffer.buf);
1973         if (!aborted) {
1974                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1975
1976                 slot = get_active_slot();
1977                 slot->results = &results;
1978                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1979                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1980                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1981 #ifndef NO_CURL_IOCTL
1982                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1983                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1984 #endif
1985                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1986                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1987                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1988                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1989                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1990                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1991
1992                 if (start_active_slot(slot)) {
1993                         run_active_slot(slot);
1994                         if (results.curl_result != CURLE_OK) {
1995                                 fprintf(stderr,
1996                                         "PUT error: curl result=%d, HTTP code=%ld\n",
1997                                         results.curl_result, results.http_code);
1998                         }
1999                 }
2000         }
2001         strbuf_release(&buffer.buf);
2002 }
2003
2004 static int remote_exists(const char *path)
2005 {
2006         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
2007         struct active_request_slot *slot;
2008         struct slot_results results;
2009         int ret = -1;
2010
2011         sprintf(url, "%s%s", repo->url, path);
2012
2013         slot = get_active_slot();
2014         slot->results = &results;
2015         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2016         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2017
2018         if (start_active_slot(slot)) {
2019                 run_active_slot(slot);
2020                 if (results.http_code == 404)
2021                         ret = 0;
2022                 else if (results.curl_result == CURLE_OK)
2023                         ret = 1;
2024                 else
2025                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2026         } else {
2027                 fprintf(stderr, "Unable to start HEAD request\n");
2028         }
2029
2030         free(url);
2031         return ret;
2032 }
2033
2034 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2035 {
2036         char *url;
2037         struct strbuf buffer = STRBUF_INIT;
2038         struct active_request_slot *slot;
2039         struct slot_results results;
2040
2041         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
2042         sprintf(url, "%s%s", repo->url, path);
2043
2044         slot = get_active_slot();
2045         slot->results = &results;
2046         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2047         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2048         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2049         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2050         if (start_active_slot(slot)) {
2051                 run_active_slot(slot);
2052                 if (results.curl_result != CURLE_OK) {
2053                         die("Couldn't get %s for remote symref\n%s",
2054                             url, curl_errorstr);
2055                 }
2056         } else {
2057                 die("Unable to start remote symref request");
2058         }
2059         free(url);
2060
2061         free(*symref);
2062         *symref = NULL;
2063         hashclr(sha1);
2064
2065         if (buffer.len == 0)
2066                 return;
2067
2068         /* If it's a symref, set the refname; otherwise try for a sha1 */
2069         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2070                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2071         } else {
2072                 get_sha1_hex(buffer.buf, sha1);
2073         }
2074
2075         strbuf_release(&buffer);
2076 }
2077
2078 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2079 {
2080         struct commit *head = lookup_commit(head_sha1);
2081         struct commit *branch = lookup_commit(branch_sha1);
2082         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2083
2084         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2085 }
2086
2087 static int delete_remote_branch(char *pattern, int force)
2088 {
2089         struct ref *refs = remote_refs;
2090         struct ref *remote_ref = NULL;
2091         unsigned char head_sha1[20];
2092         char *symref = NULL;
2093         int match;
2094         int patlen = strlen(pattern);
2095         int i;
2096         struct active_request_slot *slot;
2097         struct slot_results results;
2098         char *url;
2099
2100         /* Find the remote branch(es) matching the specified branch name */
2101         for (match = 0; refs; refs = refs->next) {
2102                 char *name = refs->name;
2103                 int namelen = strlen(name);
2104                 if (namelen < patlen ||
2105                     memcmp(name + namelen - patlen, pattern, patlen))
2106                         continue;
2107                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2108                         continue;
2109                 match++;
2110                 remote_ref = refs;
2111         }
2112         if (match == 0)
2113                 return error("No remote branch matches %s", pattern);
2114         if (match != 1)
2115                 return error("More than one remote branch matches %s",
2116                              pattern);
2117
2118         /*
2119          * Remote HEAD must be a symref (not exactly foolproof; a remote
2120          * symlink to a symref will look like a symref)
2121          */
2122         fetch_symref("HEAD", &symref, head_sha1);
2123         if (!symref)
2124                 return error("Remote HEAD is not a symref");
2125
2126         /* Remote branch must not be the remote HEAD */
2127         for (i=0; symref && i<MAXDEPTH; i++) {
2128                 if (!strcmp(remote_ref->name, symref))
2129                         return error("Remote branch %s is the current HEAD",
2130                                      remote_ref->name);
2131                 fetch_symref(symref, &symref, head_sha1);
2132         }
2133
2134         /* Run extra sanity checks if delete is not forced */
2135         if (!force) {
2136                 /* Remote HEAD must resolve to a known object */
2137                 if (symref)
2138                         return error("Remote HEAD symrefs too deep");
2139                 if (is_zero_sha1(head_sha1))
2140                         return error("Unable to resolve remote HEAD");
2141                 if (!has_sha1_file(head_sha1))
2142                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2143
2144                 /* Remote branch must resolve to a known object */
2145                 if (is_zero_sha1(remote_ref->old_sha1))
2146                         return error("Unable to resolve remote branch %s",
2147                                      remote_ref->name);
2148                 if (!has_sha1_file(remote_ref->old_sha1))
2149                         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));
2150
2151                 /* Remote branch must be an ancestor of remote HEAD */
2152                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2153                         return error("The branch '%s' is not an ancestor "
2154                                      "of your current HEAD.\n"
2155                                      "If you are sure you want to delete it,"
2156                                      " run:\n\t'git http-push -D %s %s'",
2157                                      remote_ref->name, repo->url, pattern);
2158                 }
2159         }
2160
2161         /* Send delete request */
2162         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2163         if (dry_run)
2164                 return 0;
2165         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
2166         sprintf(url, "%s%s", repo->url, remote_ref->name);
2167         slot = get_active_slot();
2168         slot->results = &results;
2169         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2170         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2171         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2172         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2173         if (start_active_slot(slot)) {
2174                 run_active_slot(slot);
2175                 free(url);
2176                 if (results.curl_result != CURLE_OK)
2177                         return error("DELETE request failed (%d/%ld)\n",
2178                                      results.curl_result, results.http_code);
2179         } else {
2180                 free(url);
2181                 return error("Unable to start DELETE request");
2182         }
2183
2184         return 0;
2185 }
2186
2187 void run_request_queue(void)
2188 {
2189 #ifdef USE_CURL_MULTI
2190         is_running_queue = 1;
2191         fill_active_slots();
2192         add_fill_function(NULL, fill_active_slot);
2193 #endif
2194         do {
2195                 finish_all_active_slots();
2196 #ifdef USE_CURL_MULTI
2197                 fill_active_slots();
2198 #endif
2199         } while (request_queue_head && !aborted);
2200
2201 #ifdef USE_CURL_MULTI
2202         is_running_queue = 0;
2203 #endif
2204 }
2205
2206 int main(int argc, char **argv)
2207 {
2208         struct transfer_request *request;
2209         struct transfer_request *next_request;
2210         int nr_refspec = 0;
2211         char **refspec = NULL;
2212         struct remote_lock *ref_lock = NULL;
2213         struct remote_lock *info_ref_lock = NULL;
2214         struct rev_info revs;
2215         int delete_branch = 0;
2216         int force_delete = 0;
2217         int objects_to_send;
2218         int rc = 0;
2219         int i;
2220         int new_refs;
2221         struct ref *ref, *local_refs;
2222         struct remote *remote;
2223         char *rewritten_url = NULL;
2224
2225         git_extract_argv0_path(argv[0]);
2226
2227         setup_git_directory();
2228
2229         repo = xcalloc(sizeof(*repo), 1);
2230
2231         argv++;
2232         for (i = 1; i < argc; i++, argv++) {
2233                 char *arg = *argv;
2234
2235                 if (*arg == '-') {
2236                         if (!strcmp(arg, "--all")) {
2237                                 push_all = MATCH_REFS_ALL;
2238                                 continue;
2239                         }
2240                         if (!strcmp(arg, "--force")) {
2241                                 force_all = 1;
2242                                 continue;
2243                         }
2244                         if (!strcmp(arg, "--dry-run")) {
2245                                 dry_run = 1;
2246                                 continue;
2247                         }
2248                         if (!strcmp(arg, "--verbose")) {
2249                                 push_verbosely = 1;
2250                                 continue;
2251                         }
2252                         if (!strcmp(arg, "-d")) {
2253                                 delete_branch = 1;
2254                                 continue;
2255                         }
2256                         if (!strcmp(arg, "-D")) {
2257                                 delete_branch = 1;
2258                                 force_delete = 1;
2259                                 continue;
2260                         }
2261                 }
2262                 if (!repo->url) {
2263                         char *path = strstr(arg, "//");
2264                         repo->url = arg;
2265                         repo->path_len = strlen(arg);
2266                         if (path) {
2267                                 repo->path = strchr(path+2, '/');
2268                                 if (repo->path)
2269                                         repo->path_len = strlen(repo->path);
2270                         }
2271                         continue;
2272                 }
2273                 refspec = argv;
2274                 nr_refspec = argc - i;
2275                 break;
2276         }
2277
2278 #ifndef USE_CURL_MULTI
2279         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2280 #endif
2281
2282         if (!repo->url)
2283                 usage(http_push_usage);
2284
2285         if (delete_branch && nr_refspec != 1)
2286                 die("You must specify only one branch name when deleting a remote branch");
2287
2288         memset(remote_dir_exists, -1, 256);
2289
2290         /*
2291          * Create a minimum remote by hand to give to http_init(),
2292          * primarily to allow it to look at the URL.
2293          */
2294         remote = xcalloc(sizeof(*remote), 1);
2295         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
2296         remote->url[remote->url_nr++] = repo->url;
2297         http_init(remote);
2298
2299         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2300
2301         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
2302                 rewritten_url = xmalloc(strlen(repo->url)+2);
2303                 strcpy(rewritten_url, repo->url);
2304                 strcat(rewritten_url, "/");
2305                 repo->path = rewritten_url + (repo->path - repo->url);
2306                 repo->path_len++;
2307                 repo->url = rewritten_url;
2308         }
2309
2310 #ifdef USE_CURL_MULTI
2311         is_running_queue = 0;
2312 #endif
2313
2314         /* Verify DAV compliance/lock support */
2315         if (!locking_available()) {
2316                 rc = 1;
2317                 goto cleanup;
2318         }
2319
2320         sigchain_push_common(remove_locks_on_signal);
2321
2322         /* Check whether the remote has server info files */
2323         repo->can_update_info_refs = 0;
2324         repo->has_info_refs = remote_exists("info/refs");
2325         repo->has_info_packs = remote_exists("objects/info/packs");
2326         if (repo->has_info_refs) {
2327                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2328                 if (info_ref_lock)
2329                         repo->can_update_info_refs = 1;
2330                 else {
2331                         error("cannot lock existing info/refs");
2332                         rc = 1;
2333                         goto cleanup;
2334                 }
2335         }
2336         if (repo->has_info_packs)
2337                 fetch_indices();
2338
2339         /* Get a list of all local and remote heads to validate refspecs */
2340         local_refs = get_local_heads();
2341         fprintf(stderr, "Fetching remote heads...\n");
2342         get_dav_remote_heads();
2343         run_request_queue();
2344
2345         /* Remove a remote branch if -d or -D was specified */
2346         if (delete_branch) {
2347                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2348                         fprintf(stderr, "Unable to delete remote branch %s\n",
2349                                 refspec[0]);
2350                 goto cleanup;
2351         }
2352
2353         /* match them up */
2354         if (!remote_tail)
2355                 remote_tail = &remote_refs;
2356         if (match_refs(local_refs, remote_refs, &remote_tail,
2357                        nr_refspec, (const char **) refspec, push_all)) {
2358                 rc = -1;
2359                 goto cleanup;
2360         }
2361         if (!remote_refs) {
2362                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2363                 rc = 0;
2364                 goto cleanup;
2365         }
2366
2367         new_refs = 0;
2368         for (ref = remote_refs; ref; ref = ref->next) {
2369                 char old_hex[60], *new_hex;
2370                 const char *commit_argv[4];
2371                 int commit_argc;
2372                 char *new_sha1_hex, *old_sha1_hex;
2373
2374                 if (!ref->peer_ref)
2375                         continue;
2376
2377                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2378                         if (delete_remote_branch(ref->name, 1) == -1) {
2379                                 error("Could not remove %s", ref->name);
2380                                 rc = -4;
2381                         }
2382                         new_refs++;
2383                         continue;
2384                 }
2385
2386                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2387                         if (push_verbosely || 1)
2388                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2389                         continue;
2390                 }
2391
2392                 if (!force_all &&
2393                     !is_zero_sha1(ref->old_sha1) &&
2394                     !ref->force) {
2395                         if (!has_sha1_file(ref->old_sha1) ||
2396                             !ref_newer(ref->peer_ref->new_sha1,
2397                                        ref->old_sha1)) {
2398                                 /*
2399                                  * We do not have the remote ref, or
2400                                  * we know that the remote ref is not
2401                                  * an ancestor of what we are trying to
2402                                  * push.  Either way this can be losing
2403                                  * commits at the remote end and likely
2404                                  * we were not up to date to begin with.
2405                                  */
2406                                 error("remote '%s' is not an ancestor of\n"
2407                                       "local '%s'.\n"
2408                                       "Maybe you are not up-to-date and "
2409                                       "need to pull first?",
2410                                       ref->name,
2411                                       ref->peer_ref->name);
2412                                 rc = -2;
2413                                 continue;
2414                         }
2415                 }
2416                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2417                 new_refs++;
2418                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2419                 new_hex = sha1_to_hex(ref->new_sha1);
2420
2421                 fprintf(stderr, "updating '%s'", ref->name);
2422                 if (strcmp(ref->name, ref->peer_ref->name))
2423                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2424                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2425                 if (dry_run)
2426                         continue;
2427
2428                 /* Lock remote branch ref */
2429                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2430                 if (ref_lock == NULL) {
2431                         fprintf(stderr, "Unable to lock remote branch %s\n",
2432                                 ref->name);
2433                         rc = 1;
2434                         continue;
2435                 }
2436
2437                 /* Set up revision info for this refspec */
2438                 commit_argc = 3;
2439                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2440                 old_sha1_hex = NULL;
2441                 commit_argv[1] = "--objects";
2442                 commit_argv[2] = new_sha1_hex;
2443                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2444                         old_sha1_hex = xmalloc(42);
2445                         sprintf(old_sha1_hex, "^%s",
2446                                 sha1_to_hex(ref->old_sha1));
2447                         commit_argv[3] = old_sha1_hex;
2448                         commit_argc++;
2449                 }
2450                 init_revisions(&revs, setup_git_directory());
2451                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2452                 revs.edge_hint = 0; /* just in case */
2453                 free(new_sha1_hex);
2454                 if (old_sha1_hex) {
2455                         free(old_sha1_hex);
2456                         commit_argv[1] = NULL;
2457                 }
2458
2459                 /* Generate a list of objects that need to be pushed */
2460                 pushing = 0;
2461                 if (prepare_revision_walk(&revs))
2462                         die("revision walk setup failed");
2463                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2464                 objects_to_send = get_delta(&revs, ref_lock);
2465                 finish_all_active_slots();
2466
2467                 /* Push missing objects to remote, this would be a
2468                    convenient time to pack them first if appropriate. */
2469                 pushing = 1;
2470                 if (objects_to_send)
2471                         fprintf(stderr, "    sending %d objects\n",
2472                                 objects_to_send);
2473
2474                 run_request_queue();
2475
2476                 /* Update the remote branch if all went well */
2477                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2478                         rc = 1;
2479
2480                 if (!rc)
2481                         fprintf(stderr, "    done\n");
2482                 unlock_remote(ref_lock);
2483                 check_locks();
2484         }
2485
2486         /* Update remote server info if appropriate */
2487         if (repo->has_info_refs && new_refs) {
2488                 if (info_ref_lock && repo->can_update_info_refs) {
2489                         fprintf(stderr, "Updating remote server info\n");
2490                         if (!dry_run)
2491                                 update_remote_info_refs(info_ref_lock);
2492                 } else {
2493                         fprintf(stderr, "Unable to update server info\n");
2494                 }
2495         }
2496
2497  cleanup:
2498         free(rewritten_url);
2499         if (info_ref_lock)
2500                 unlock_remote(info_ref_lock);
2501         free(repo);
2502
2503         curl_slist_free_all(no_pragma_header);
2504
2505         http_cleanup();
2506
2507         request = request_queue_head;
2508         while (request != NULL) {
2509                 next_request = request->next;
2510                 release_request(request);
2511                 request = next_request;
2512         }
2513
2514         return rc;
2515 }