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         int ret = 0;
 962         char *hex = xstrdup(sha1_to_hex(sha1));
 963         char *filename;
 964         char *url;
 965         char tmpfile[PATH_MAX];
 966         long prev_posn = 0;
 967         char range[RANGE_HEADER_SIZE];
 968         struct curl_slist *range_header = NULL;
 969
 970         FILE *indexfile;
 971         struct active_request_slot *slot;
 972         struct slot_results results;
 973
 974         /* Don't use the index if the pack isn't there */
 975         url = xmalloc(strlen(repo->url) + 64);
 976         sprintf(url, "%sobjects/pack/pack-%s.pack", repo->url, hex);
 977         slot = get_active_slot();
 978         slot->results = &results;
 979         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 980         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 981         if (start_active_slot(slot)) {
 982                 run_active_slot(slot);
 983                 if (results.curl_result != CURLE_OK) {
 984                         ret = error("Unable to verify pack %s is available",
 985                                     hex);
 986                         goto cleanup_pack;
 987                 }
 988         } else {
 989                 ret = error("Unable to start request");
 990                 goto cleanup_pack;
 991         }
 992
 993         if (has_pack_index(sha1)) {
 994                 ret = 0;
 995                 goto cleanup_pack;
 996         }
 997
 998         if (push_verbosely)
 999                 fprintf(stderr, "Getting index for pack %s\n", hex);
1000
1001         sprintf(url, "%sobjects/pack/pack-%s.idx", repo->url, hex);
1002
1003         filename = sha1_pack_index_name(sha1);
1004         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
1005         indexfile = fopen(tmpfile, "a");
1006         if (!indexfile) {
1007                 ret = error("Unable to open local file %s for pack index",
1008                             tmpfile);
1009                 goto cleanup_pack;
1010         }
1011
1012         slot = get_active_slot();
1013         slot->results = &results;
1014         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1015         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1016         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
1017         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1018         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1019         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1020         slot->local = indexfile;
1021
1022         /*
1023          * If there is data present from a previous transfer attempt,
1024          * resume where it left off
1025          */
1026         prev_posn = ftell(indexfile);
1027         if (prev_posn>0) {
1028                 if (push_verbosely)
1029                         fprintf(stderr,
1030                                 "Resuming fetch of index for pack %s at byte %ld\n",
1031                                 hex, prev_posn);
1032                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1033                 range_header = curl_slist_append(range_header, range);
1034                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
1035         }
1036
1037         if (start_active_slot(slot)) {
1038                 run_active_slot(slot);
1039                 if (results.curl_result != CURLE_OK) {
1040                         ret = error("Unable to get pack index %s\n%s", url,
1041                                     curl_errorstr);
1042                         goto cleanup_index;
1043                 }
1044         } else {
1045                 ret = error("Unable to start request");
1046                 goto cleanup_index;
1047         }
1048
1049         ret = move_temp_to_file(tmpfile, filename);
1050
1051 cleanup_index:
1052         fclose(indexfile);
1053         slot->local = NULL;
1054 cleanup_pack:
1055         free(url);
1056         free(hex);
1057         return ret;
1058 }
1059
1060 static int setup_index(unsigned char *sha1)
1061 {
1062         struct packed_git *new_pack;
1063
1064         if (fetch_index(sha1))
1065                 return -1;
1066
1067         new_pack = parse_pack_index(sha1);
1068         if (!new_pack)
1069                 return -1; /* parse_pack_index() already issued error message */
1070         new_pack->next = repo->packs;
1071         repo->packs = new_pack;
1072         return 0;
1073 }
1074
1075 static int fetch_indices(void)
1076 {
1077         unsigned char sha1[20];
1078         char *url;
1079         struct strbuf buffer = STRBUF_INIT;
1080         char *data;
1081         int i = 0;
1082
1083         struct active_request_slot *slot;
1084         struct slot_results results;
1085
1086         if (push_verbosely)
1087                 fprintf(stderr, "Getting pack list\n");
1088
1089         url = xmalloc(strlen(repo->url) + 20);
1090         sprintf(url, "%sobjects/info/packs", repo->url);
1091
1092         slot = get_active_slot();
1093         slot->results = &results;
1094         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1095         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1096         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1097         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1098         if (start_active_slot(slot)) {
1099                 run_active_slot(slot);
1100                 if (results.curl_result != CURLE_OK) {
1101                         strbuf_release(&buffer);
1102                         free(url);
1103                         if (results.http_code == 404)
1104                                 return 0;
1105                         else
1106                                 return error("%s", curl_errorstr);
1107                 }
1108         } else {
1109                 strbuf_release(&buffer);
1110                 free(url);
1111                 return error("Unable to start request");
1112         }
1113         free(url);
1114
1115         data = buffer.buf;
1116         while (i < buffer.len) {
1117                 switch (data[i]) {
1118                 case 'P':
1119                         i++;
1120                         if (i + 52 < buffer.len &&
1121                             !prefixcmp(data + i, " pack-") &&
1122                             !prefixcmp(data + i + 46, ".pack\n")) {
1123                                 get_sha1_hex(data + i + 6, sha1);
1124                                 setup_index(sha1);
1125                                 i += 51;
1126                                 break;
1127                         }
1128                 default:
1129                         while (data[i] != '\n')
1130                                 i++;
1131                 }
1132                 i++;
1133         }
1134
1135         strbuf_release(&buffer);
1136         return 0;
1137 }
1138
1139 static void one_remote_object(const char *hex)
1140 {
1141         unsigned char sha1[20];
1142         struct object *obj;
1143
1144         if (get_sha1_hex(hex, sha1) != 0)
1145                 return;
1146
1147         obj = lookup_object(sha1);
1148         if (!obj)
1149                 obj = parse_object(sha1);
1150
1151         /* Ignore remote objects that don't exist locally */
1152         if (!obj)
1153                 return;
1154
1155         obj->flags |= REMOTE;
1156         if (!object_list_contains(objects, obj))
1157                 object_list_insert(obj, &objects);
1158 }
1159
1160 static void handle_lockprop_ctx(struct xml_ctx *ctx, int tag_closed)
1161 {
1162         int *lock_flags = (int *)ctx->userData;
1163
1164         if (tag_closed) {
1165                 if (!strcmp(ctx->name, DAV_CTX_LOCKENTRY)) {
1166                         if ((*lock_flags & DAV_PROP_LOCKEX) &&
1167                             (*lock_flags & DAV_PROP_LOCKWR)) {
1168                                 *lock_flags |= DAV_LOCK_OK;
1169                         }
1170                         *lock_flags &= DAV_LOCK_OK;
1171                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_WRITE)) {
1172                         *lock_flags |= DAV_PROP_LOCKWR;
1173                 } else if (!strcmp(ctx->name, DAV_CTX_LOCKTYPE_EXCLUSIVE)) {
1174                         *lock_flags |= DAV_PROP_LOCKEX;
1175                 }
1176         }
1177 }
1178
1179 static void handle_new_lock_ctx(struct xml_ctx *ctx, int tag_closed)
1180 {
1181         struct remote_lock *lock = (struct remote_lock *)ctx->userData;
1182         git_SHA_CTX sha_ctx;
1183         unsigned char lock_token_sha1[20];
1184
1185         if (tag_closed && ctx->cdata) {
1186                 if (!strcmp(ctx->name, DAV_ACTIVELOCK_OWNER)) {
1187                         lock->owner = xmalloc(strlen(ctx->cdata) + 1);
1188                         strcpy(lock->owner, ctx->cdata);
1189                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TIMEOUT)) {
1190                         if (!prefixcmp(ctx->cdata, "Second-"))
1191                                 lock->timeout =
1192                                         strtol(ctx->cdata + 7, NULL, 10);
1193                 } else if (!strcmp(ctx->name, DAV_ACTIVELOCK_TOKEN)) {
1194                         lock->token = xmalloc(strlen(ctx->cdata) + 1);
1195                         strcpy(lock->token, ctx->cdata);
1196
1197                         git_SHA1_Init(&sha_ctx);
1198                         git_SHA1_Update(&sha_ctx, lock->token, strlen(lock->token));
1199                         git_SHA1_Final(lock_token_sha1, &sha_ctx);
1200
1201                         lock->tmpfile_suffix[0] = '_';
1202                         memcpy(lock->tmpfile_suffix + 1, sha1_to_hex(lock_token_sha1), 40);
1203                 }
1204         }
1205 }
1206
1207 static void one_remote_ref(char *refname);
1208
1209 static void
1210 xml_start_tag(void *userData, const char *name, const char **atts)
1211 {
1212         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1213         const char *c = strchr(name, ':');
1214         int new_len;
1215
1216         if (c == NULL)
1217                 c = name;
1218         else
1219                 c++;
1220
1221         new_len = strlen(ctx->name) + strlen(c) + 2;
1222
1223         if (new_len > ctx->len) {
1224                 ctx->name = xrealloc(ctx->name, new_len);
1225                 ctx->len = new_len;
1226         }
1227         strcat(ctx->name, ".");
1228         strcat(ctx->name, c);
1229
1230         free(ctx->cdata);
1231         ctx->cdata = NULL;
1232
1233         ctx->userFunc(ctx, 0);
1234 }
1235
1236 static void
1237 xml_end_tag(void *userData, const char *name)
1238 {
1239         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1240         const char *c = strchr(name, ':');
1241         char *ep;
1242
1243         ctx->userFunc(ctx, 1);
1244
1245         if (c == NULL)
1246                 c = name;
1247         else
1248                 c++;
1249
1250         ep = ctx->name + strlen(ctx->name) - strlen(c) - 1;
1251         *ep = 0;
1252 }
1253
1254 static void
1255 xml_cdata(void *userData, const XML_Char *s, int len)
1256 {
1257         struct xml_ctx *ctx = (struct xml_ctx *)userData;
1258         free(ctx->cdata);
1259         ctx->cdata = xmemdupz(s, len);
1260 }
1261
1262 static struct remote_lock *lock_remote(const char *path, long timeout)
1263 {
1264         struct active_request_slot *slot;
1265         struct slot_results results;
1266         struct buffer out_buffer = { STRBUF_INIT, 0 };
1267         struct strbuf in_buffer = STRBUF_INIT;
1268         char *url;
1269         char *ep;
1270         char timeout_header[25];
1271         struct remote_lock *lock = NULL;
1272         struct curl_slist *dav_headers = NULL;
1273         struct xml_ctx ctx;
1274         char *escaped;
1275
1276         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1277         sprintf(url, "%s%s", repo->url, path);
1278
1279         /* Make sure leading directories exist for the remote ref */
1280         ep = strchr(url + strlen(repo->url) + 1, '/');
1281         while (ep) {
1282                 char saved_character = ep[1];
1283                 ep[1] = '\0';
1284                 slot = get_active_slot();
1285                 slot->results = &results;
1286                 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1287                 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1288                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_MKCOL);
1289                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1290                 if (start_active_slot(slot)) {
1291                         run_active_slot(slot);
1292                         if (results.curl_result != CURLE_OK &&
1293                             results.http_code != 405) {
1294                                 fprintf(stderr,
1295                                         "Unable to create branch path %s\n",
1296                                         url);
1297                                 free(url);
1298                                 return NULL;
1299                         }
1300                 } else {
1301                         fprintf(stderr, "Unable to start MKCOL request\n");
1302                         free(url);
1303                         return NULL;
1304                 }
1305                 ep[1] = saved_character;
1306                 ep = strchr(ep + 1, '/');
1307         }
1308
1309         escaped = xml_entities(git_default_email);
1310         strbuf_addf(&out_buffer.buf, LOCK_REQUEST, escaped);
1311         free(escaped);
1312
1313         sprintf(timeout_header, "Timeout: Second-%ld", timeout);
1314         dav_headers = curl_slist_append(dav_headers, timeout_header);
1315         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1316
1317         slot = get_active_slot();
1318         slot->results = &results;
1319         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1320         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1321         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1322 #ifndef NO_CURL_IOCTL
1323         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1324         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1325 #endif
1326         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1327         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1328         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1329         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1330         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_LOCK);
1331         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1332
1333         lock = xcalloc(1, sizeof(*lock));
1334         lock->timeout = -1;
1335
1336         if (start_active_slot(slot)) {
1337                 run_active_slot(slot);
1338                 if (results.curl_result == CURLE_OK) {
1339                         XML_Parser parser = XML_ParserCreate(NULL);
1340                         enum XML_Status result;
1341                         ctx.name = xcalloc(10, 1);
1342                         ctx.len = 0;
1343                         ctx.cdata = NULL;
1344                         ctx.userFunc = handle_new_lock_ctx;
1345                         ctx.userData = lock;
1346                         XML_SetUserData(parser, &ctx);
1347                         XML_SetElementHandler(parser, xml_start_tag,
1348                                               xml_end_tag);
1349                         XML_SetCharacterDataHandler(parser, xml_cdata);
1350                         result = XML_Parse(parser, in_buffer.buf,
1351                                            in_buffer.len, 1);
1352                         free(ctx.name);
1353                         if (result != XML_STATUS_OK) {
1354                                 fprintf(stderr, "XML error: %s\n",
1355                                         XML_ErrorString(
1356                                                 XML_GetErrorCode(parser)));
1357                                 lock->timeout = -1;
1358                         }
1359                         XML_ParserFree(parser);
1360                 }
1361         } else {
1362                 fprintf(stderr, "Unable to start LOCK request\n");
1363         }
1364
1365         curl_slist_free_all(dav_headers);
1366         strbuf_release(&out_buffer.buf);
1367         strbuf_release(&in_buffer);
1368
1369         if (lock->token == NULL || lock->timeout <= 0) {
1370                 free(lock->token);
1371                 free(lock->owner);
1372                 free(url);
1373                 free(lock);
1374                 lock = NULL;
1375         } else {
1376                 lock->url = url;
1377                 lock->start_time = time(NULL);
1378                 lock->next = repo->locks;
1379                 repo->locks = lock;
1380         }
1381
1382         return lock;
1383 }
1384
1385 static int unlock_remote(struct remote_lock *lock)
1386 {
1387         struct active_request_slot *slot;
1388         struct slot_results results;
1389         struct remote_lock *prev = repo->locks;
1390         struct curl_slist *dav_headers;
1391         int rc = 0;
1392
1393         dav_headers = get_dav_token_headers(lock, DAV_HEADER_LOCK);
1394
1395         slot = get_active_slot();
1396         slot->results = &results;
1397         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1398         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1399         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_UNLOCK);
1400         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1401
1402         if (start_active_slot(slot)) {
1403                 run_active_slot(slot);
1404                 if (results.curl_result == CURLE_OK)
1405                         rc = 1;
1406                 else
1407                         fprintf(stderr, "UNLOCK HTTP error %ld\n",
1408                                 results.http_code);
1409         } else {
1410                 fprintf(stderr, "Unable to start UNLOCK request\n");
1411         }
1412
1413         curl_slist_free_all(dav_headers);
1414
1415         if (repo->locks == lock) {
1416                 repo->locks = lock->next;
1417         } else {
1418                 while (prev && prev->next != lock)
1419                         prev = prev->next;
1420                 if (prev)
1421                         prev->next = prev->next->next;
1422         }
1423
1424         free(lock->owner);
1425         free(lock->url);
1426         free(lock->token);
1427         free(lock);
1428
1429         return rc;
1430 }
1431
1432 static void remove_locks(void)
1433 {
1434         struct remote_lock *lock = repo->locks;
1435
1436         fprintf(stderr, "Removing remote locks...\n");
1437         while (lock) {
1438                 unlock_remote(lock);
1439                 lock = lock->next;
1440         }
1441 }
1442
1443 static void remove_locks_on_signal(int signo)
1444 {
1445         remove_locks();
1446         sigchain_pop(signo);
1447         raise(signo);
1448 }
1449
1450 static void remote_ls(const char *path, int flags,
1451                       void (*userFunc)(struct remote_ls_ctx *ls),
1452                       void *userData);
1453
1454 static void process_ls_object(struct remote_ls_ctx *ls)
1455 {
1456         unsigned int *parent = (unsigned int *)ls->userData;
1457         char *path = ls->dentry_name;
1458         char *obj_hex;
1459
1460         if (!strcmp(ls->path, ls->dentry_name) && (ls->flags & IS_DIR)) {
1461                 remote_dir_exists[*parent] = 1;
1462                 return;
1463         }
1464
1465         if (strlen(path) != 49)
1466                 return;
1467         path += 8;
1468         obj_hex = xmalloc(strlen(path));
1469         /* NB: path is not null-terminated, can not use strlcpy here */
1470         memcpy(obj_hex, path, 2);
1471         strcpy(obj_hex + 2, path + 3);
1472         one_remote_object(obj_hex);
1473         free(obj_hex);
1474 }
1475
1476 static void process_ls_ref(struct remote_ls_ctx *ls)
1477 {
1478         if (!strcmp(ls->path, ls->dentry_name) && (ls->dentry_flags & IS_DIR)) {
1479                 fprintf(stderr, "  %s\n", ls->dentry_name);
1480                 return;
1481         }
1482
1483         if (!(ls->dentry_flags & IS_DIR))
1484                 one_remote_ref(ls->dentry_name);
1485 }
1486
1487 static void handle_remote_ls_ctx(struct xml_ctx *ctx, int tag_closed)
1488 {
1489         struct remote_ls_ctx *ls = (struct remote_ls_ctx *)ctx->userData;
1490
1491         if (tag_closed) {
1492                 if (!strcmp(ctx->name, DAV_PROPFIND_RESP) && ls->dentry_name) {
1493                         if (ls->dentry_flags & IS_DIR) {
1494                                 if (ls->flags & PROCESS_DIRS) {
1495                                         ls->userFunc(ls);
1496                                 }
1497                                 if (strcmp(ls->dentry_name, ls->path) &&
1498                                     ls->flags & RECURSIVE) {
1499                                         remote_ls(ls->dentry_name,
1500                                                   ls->flags,
1501                                                   ls->userFunc,
1502                                                   ls->userData);
1503                                 }
1504                         } else if (ls->flags & PROCESS_FILES) {
1505                                 ls->userFunc(ls);
1506                         }
1507                 } else if (!strcmp(ctx->name, DAV_PROPFIND_NAME) && ctx->cdata) {
1508                         char *path = ctx->cdata;
1509                         if (*ctx->cdata == 'h') {
1510                                 path = strstr(path, "//");
1511                                 if (path) {
1512                                         path = strchr(path+2, '/');
1513                                 }
1514                         }
1515                         if (path) {
1516                                 path += repo->path_len;
1517                                 ls->dentry_name = xstrdup(path);
1518                         }
1519                 } else if (!strcmp(ctx->name, DAV_PROPFIND_COLLECTION)) {
1520                         ls->dentry_flags |= IS_DIR;
1521                 }
1522         } else if (!strcmp(ctx->name, DAV_PROPFIND_RESP)) {
1523                 free(ls->dentry_name);
1524                 ls->dentry_name = NULL;
1525                 ls->dentry_flags = 0;
1526         }
1527 }
1528
1529 /*
1530  * NEEDSWORK: remote_ls() ignores info/refs on the remote side.  But it
1531  * should _only_ heed the information from that file, instead of trying to
1532  * determine the refs from the remote file system (badly: it does not even
1533  * know about packed-refs).
1534  */
1535 static void remote_ls(const char *path, int flags,
1536                       void (*userFunc)(struct remote_ls_ctx *ls),
1537                       void *userData)
1538 {
1539         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
1540         struct active_request_slot *slot;
1541         struct slot_results results;
1542         struct strbuf in_buffer = STRBUF_INIT;
1543         struct buffer out_buffer = { STRBUF_INIT, 0 };
1544         struct curl_slist *dav_headers = NULL;
1545         struct xml_ctx ctx;
1546         struct remote_ls_ctx ls;
1547
1548         ls.flags = flags;
1549         ls.path = xstrdup(path);
1550         ls.dentry_name = NULL;
1551         ls.dentry_flags = 0;
1552         ls.userData = userData;
1553         ls.userFunc = userFunc;
1554
1555         sprintf(url, "%s%s", repo->url, path);
1556
1557         strbuf_addf(&out_buffer.buf, PROPFIND_ALL_REQUEST);
1558
1559         dav_headers = curl_slist_append(dav_headers, "Depth: 1");
1560         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1561
1562         slot = get_active_slot();
1563         slot->results = &results;
1564         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1565         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1566         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1567 #ifndef NO_CURL_IOCTL
1568         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1569         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1570 #endif
1571         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1572         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1573         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1574         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1575         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1576         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1577
1578         if (start_active_slot(slot)) {
1579                 run_active_slot(slot);
1580                 if (results.curl_result == CURLE_OK) {
1581                         XML_Parser parser = XML_ParserCreate(NULL);
1582                         enum XML_Status result;
1583                         ctx.name = xcalloc(10, 1);
1584                         ctx.len = 0;
1585                         ctx.cdata = NULL;
1586                         ctx.userFunc = handle_remote_ls_ctx;
1587                         ctx.userData = &ls;
1588                         XML_SetUserData(parser, &ctx);
1589                         XML_SetElementHandler(parser, xml_start_tag,
1590                                               xml_end_tag);
1591                         XML_SetCharacterDataHandler(parser, xml_cdata);
1592                         result = XML_Parse(parser, in_buffer.buf,
1593                                            in_buffer.len, 1);
1594                         free(ctx.name);
1595
1596                         if (result != XML_STATUS_OK) {
1597                                 fprintf(stderr, "XML error: %s\n",
1598                                         XML_ErrorString(
1599                                                 XML_GetErrorCode(parser)));
1600                         }
1601                         XML_ParserFree(parser);
1602                 }
1603         } else {
1604                 fprintf(stderr, "Unable to start PROPFIND request\n");
1605         }
1606
1607         free(ls.path);
1608         free(url);
1609         strbuf_release(&out_buffer.buf);
1610         strbuf_release(&in_buffer);
1611         curl_slist_free_all(dav_headers);
1612 }
1613
1614 static void get_remote_object_list(unsigned char parent)
1615 {
1616         char path[] = "objects/XX/";
1617         static const char hex[] = "0123456789abcdef";
1618         unsigned int val = parent;
1619
1620         path[8] = hex[val >> 4];
1621         path[9] = hex[val & 0xf];
1622         remote_dir_exists[val] = 0;
1623         remote_ls(path, (PROCESS_FILES | PROCESS_DIRS),
1624                   process_ls_object, &val);
1625 }
1626
1627 static int locking_available(void)
1628 {
1629         struct active_request_slot *slot;
1630         struct slot_results results;
1631         struct strbuf in_buffer = STRBUF_INIT;
1632         struct buffer out_buffer = { STRBUF_INIT, 0 };
1633         struct curl_slist *dav_headers = NULL;
1634         struct xml_ctx ctx;
1635         int lock_flags = 0;
1636         char *escaped;
1637
1638         escaped = xml_entities(repo->url);
1639         strbuf_addf(&out_buffer.buf, PROPFIND_SUPPORTEDLOCK_REQUEST, escaped);
1640         free(escaped);
1641
1642         dav_headers = curl_slist_append(dav_headers, "Depth: 0");
1643         dav_headers = curl_slist_append(dav_headers, "Content-Type: text/xml");
1644
1645         slot = get_active_slot();
1646         slot->results = &results;
1647         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1648         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1649         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1650 #ifndef NO_CURL_IOCTL
1651         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1652         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1653 #endif
1654         curl_easy_setopt(slot->curl, CURLOPT_FILE, &in_buffer);
1655         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1656         curl_easy_setopt(slot->curl, CURLOPT_URL, repo->url);
1657         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1658         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PROPFIND);
1659         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1660
1661         if (start_active_slot(slot)) {
1662                 run_active_slot(slot);
1663                 if (results.curl_result == CURLE_OK) {
1664                         XML_Parser parser = XML_ParserCreate(NULL);
1665                         enum XML_Status result;
1666                         ctx.name = xcalloc(10, 1);
1667                         ctx.len = 0;
1668                         ctx.cdata = NULL;
1669                         ctx.userFunc = handle_lockprop_ctx;
1670                         ctx.userData = &lock_flags;
1671                         XML_SetUserData(parser, &ctx);
1672                         XML_SetElementHandler(parser, xml_start_tag,
1673                                               xml_end_tag);
1674                         result = XML_Parse(parser, in_buffer.buf,
1675                                            in_buffer.len, 1);
1676                         free(ctx.name);
1677
1678                         if (result != XML_STATUS_OK) {
1679                                 fprintf(stderr, "XML error: %s\n",
1680                                         XML_ErrorString(
1681                                                 XML_GetErrorCode(parser)));
1682                                 lock_flags = 0;
1683                         }
1684                         XML_ParserFree(parser);
1685                         if (!lock_flags)
1686                                 error("no DAV locking support on %s",
1687                                       repo->url);
1688
1689                 } else {
1690                         error("Cannot access URL %s, return code %d",
1691                               repo->url, results.curl_result);
1692                         lock_flags = 0;
1693                 }
1694         } else {
1695                 error("Unable to start PROPFIND request on %s", repo->url);
1696         }
1697
1698         strbuf_release(&out_buffer.buf);
1699         strbuf_release(&in_buffer);
1700         curl_slist_free_all(dav_headers);
1701
1702         return lock_flags;
1703 }
1704
1705 static struct object_list **add_one_object(struct object *obj, struct object_list **p)
1706 {
1707         struct object_list *entry = xmalloc(sizeof(struct object_list));
1708         entry->item = obj;
1709         entry->next = *p;
1710         *p = entry;
1711         return &entry->next;
1712 }
1713
1714 static struct object_list **process_blob(struct blob *blob,
1715                                          struct object_list **p,
1716                                          struct name_path *path,
1717                                          const char *name)
1718 {
1719         struct object *obj = &blob->object;
1720
1721         obj->flags |= LOCAL;
1722
1723         if (obj->flags & (UNINTERESTING | SEEN))
1724                 return p;
1725
1726         obj->flags |= SEEN;
1727         return add_one_object(obj, p);
1728 }
1729
1730 static struct object_list **process_tree(struct tree *tree,
1731                                          struct object_list **p,
1732                                          struct name_path *path,
1733                                          const char *name)
1734 {
1735         struct object *obj = &tree->object;
1736         struct tree_desc desc;
1737         struct name_entry entry;
1738         struct name_path me;
1739
1740         obj->flags |= LOCAL;
1741
1742         if (obj->flags & (UNINTERESTING | SEEN))
1743                 return p;
1744         if (parse_tree(tree) < 0)
1745                 die("bad tree object %s", sha1_to_hex(obj->sha1));
1746
1747         obj->flags |= SEEN;
1748         name = xstrdup(name);
1749         p = add_one_object(obj, p);
1750         me.up = path;
1751         me.elem = name;
1752         me.elem_len = strlen(name);
1753
1754         init_tree_desc(&desc, tree->buffer, tree->size);
1755
1756         while (tree_entry(&desc, &entry))
1757                 switch (object_type(entry.mode)) {
1758                 case OBJ_TREE:
1759                         p = process_tree(lookup_tree(entry.sha1), p, &me, name);
1760                         break;
1761                 case OBJ_BLOB:
1762                         p = process_blob(lookup_blob(entry.sha1), p, &me, name);
1763                         break;
1764                 default:
1765                         /* Subproject commit - not in this repository */
1766                         break;
1767                 }
1768
1769         free(tree->buffer);
1770         tree->buffer = NULL;
1771         return p;
1772 }
1773
1774 static int get_delta(struct rev_info *revs, struct remote_lock *lock)
1775 {
1776         int i;
1777         struct commit *commit;
1778         struct object_list **p = &objects;
1779         int count = 0;
1780
1781         while ((commit = get_revision(revs)) != NULL) {
1782                 p = process_tree(commit->tree, p, NULL, "");
1783                 commit->object.flags |= LOCAL;
1784                 if (!(commit->object.flags & UNINTERESTING))
1785                         count += add_send_request(&commit->object, lock);
1786         }
1787
1788         for (i = 0; i < revs->pending.nr; i++) {
1789                 struct object_array_entry *entry = revs->pending.objects + i;
1790                 struct object *obj = entry->item;
1791                 const char *name = entry->name;
1792
1793                 if (obj->flags & (UNINTERESTING | SEEN))
1794                         continue;
1795                 if (obj->type == OBJ_TAG) {
1796                         obj->flags |= SEEN;
1797                         p = add_one_object(obj, p);
1798                         continue;
1799                 }
1800                 if (obj->type == OBJ_TREE) {
1801                         p = process_tree((struct tree *)obj, p, NULL, name);
1802                         continue;
1803                 }
1804                 if (obj->type == OBJ_BLOB) {
1805                         p = process_blob((struct blob *)obj, p, NULL, name);
1806                         continue;
1807                 }
1808                 die("unknown pending object %s (%s)", sha1_to_hex(obj->sha1), name);
1809         }
1810
1811         while (objects) {
1812                 if (!(objects->item->flags & UNINTERESTING))
1813                         count += add_send_request(objects->item, lock);
1814                 objects = objects->next;
1815         }
1816
1817         return count;
1818 }
1819
1820 static int update_remote(unsigned char *sha1, struct remote_lock *lock)
1821 {
1822         struct active_request_slot *slot;
1823         struct slot_results results;
1824         struct buffer out_buffer = { STRBUF_INIT, 0 };
1825         struct curl_slist *dav_headers;
1826
1827         dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1828
1829         strbuf_addf(&out_buffer.buf, "%s\n", sha1_to_hex(sha1));
1830
1831         slot = get_active_slot();
1832         slot->results = &results;
1833         curl_easy_setopt(slot->curl, CURLOPT_INFILE, &out_buffer);
1834         curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, out_buffer.buf.len);
1835         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1836 #ifndef NO_CURL_IOCTL
1837         curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1838         curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &out_buffer);
1839 #endif
1840         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1841         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1842         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1843         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1844         curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1845         curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1846
1847         if (start_active_slot(slot)) {
1848                 run_active_slot(slot);
1849                 strbuf_release(&out_buffer.buf);
1850                 if (results.curl_result != CURLE_OK) {
1851                         fprintf(stderr,
1852                                 "PUT error: curl result=%d, HTTP code=%ld\n",
1853                                 results.curl_result, results.http_code);
1854                         /* We should attempt recovery? */
1855                         return 0;
1856                 }
1857         } else {
1858                 strbuf_release(&out_buffer.buf);
1859                 fprintf(stderr, "Unable to start PUT request\n");
1860                 return 0;
1861         }
1862
1863         return 1;
1864 }
1865
1866 static struct ref *remote_refs, **remote_tail;
1867
1868 static void one_remote_ref(char *refname)
1869 {
1870         struct ref *ref;
1871         struct object *obj;
1872
1873         ref = alloc_ref(refname);
1874
1875         if (http_fetch_ref(repo->url, ref) != 0) {
1876                 fprintf(stderr,
1877                         "Unable to fetch ref %s from %s\n",
1878                         refname, repo->url);
1879                 free(ref);
1880                 return;
1881         }
1882
1883         /*
1884          * Fetch a copy of the object if it doesn't exist locally - it
1885          * may be required for updating server info later.
1886          */
1887         if (repo->can_update_info_refs && !has_sha1_file(ref->old_sha1)) {
1888                 obj = lookup_unknown_object(ref->old_sha1);
1889                 if (obj) {
1890                         fprintf(stderr, "  fetch %s for %s\n",
1891                                 sha1_to_hex(ref->old_sha1), refname);
1892                         add_fetch_request(obj);
1893                 }
1894         }
1895
1896         *remote_tail = ref;
1897         remote_tail = &ref->next;
1898 }
1899
1900 static void get_dav_remote_heads(void)
1901 {
1902         remote_tail = &remote_refs;
1903         remote_ls("refs/", (PROCESS_FILES | PROCESS_DIRS | RECURSIVE), process_ls_ref, NULL);
1904 }
1905
1906 static int is_zero_sha1(const unsigned char *sha1)
1907 {
1908         int i;
1909
1910         for (i = 0; i < 20; i++) {
1911                 if (*sha1++)
1912                         return 0;
1913         }
1914         return 1;
1915 }
1916
1917 static void add_remote_info_ref(struct remote_ls_ctx *ls)
1918 {
1919         struct strbuf *buf = (struct strbuf *)ls->userData;
1920         struct object *o;
1921         int len;
1922         char *ref_info;
1923         struct ref *ref;
1924
1925         ref = alloc_ref(ls->dentry_name);
1926
1927         if (http_fetch_ref(repo->url, ref) != 0) {
1928                 fprintf(stderr,
1929                         "Unable to fetch ref %s from %s\n",
1930                         ls->dentry_name, repo->url);
1931                 aborted = 1;
1932                 free(ref);
1933                 return;
1934         }
1935
1936         o = parse_object(ref->old_sha1);
1937         if (!o) {
1938                 fprintf(stderr,
1939                         "Unable to parse object %s for remote ref %s\n",
1940                         sha1_to_hex(ref->old_sha1), ls->dentry_name);
1941                 aborted = 1;
1942                 free(ref);
1943                 return;
1944         }
1945
1946         len = strlen(ls->dentry_name) + 42;
1947         ref_info = xcalloc(len + 1, 1);
1948         sprintf(ref_info, "%s   %s\n",
1949                 sha1_to_hex(ref->old_sha1), ls->dentry_name);
1950         fwrite_buffer(ref_info, 1, len, buf);
1951         free(ref_info);
1952
1953         if (o->type == OBJ_TAG) {
1954                 o = deref_tag(o, ls->dentry_name, 0);
1955                 if (o) {
1956                         len = strlen(ls->dentry_name) + 45;
1957                         ref_info = xcalloc(len + 1, 1);
1958                         sprintf(ref_info, "%s   %s^{}\n",
1959                                 sha1_to_hex(o->sha1), ls->dentry_name);
1960                         fwrite_buffer(ref_info, 1, len, buf);
1961                         free(ref_info);
1962                 }
1963         }
1964         free(ref);
1965 }
1966
1967 static void update_remote_info_refs(struct remote_lock *lock)
1968 {
1969         struct buffer buffer = { STRBUF_INIT, 0 };
1970         struct active_request_slot *slot;
1971         struct slot_results results;
1972         struct curl_slist *dav_headers;
1973
1974         remote_ls("refs/", (PROCESS_FILES | RECURSIVE),
1975                   add_remote_info_ref, &buffer.buf);
1976         if (!aborted) {
1977                 dav_headers = get_dav_token_headers(lock, DAV_HEADER_IF);
1978
1979                 slot = get_active_slot();
1980                 slot->results = &results;
1981                 curl_easy_setopt(slot->curl, CURLOPT_INFILE, &buffer);
1982                 curl_easy_setopt(slot->curl, CURLOPT_INFILESIZE, buffer.buf.len);
1983                 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, fread_buffer);
1984 #ifndef NO_CURL_IOCTL
1985                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLFUNCTION, ioctl_buffer);
1986                 curl_easy_setopt(slot->curl, CURLOPT_IOCTLDATA, &buffer);
1987 #endif
1988                 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
1989                 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_PUT);
1990                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, dav_headers);
1991                 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 1);
1992                 curl_easy_setopt(slot->curl, CURLOPT_PUT, 1);
1993                 curl_easy_setopt(slot->curl, CURLOPT_URL, lock->url);
1994
1995                 if (start_active_slot(slot)) {
1996                         run_active_slot(slot);
1997                         if (results.curl_result != CURLE_OK) {
1998                                 fprintf(stderr,
1999                                         "PUT error: curl result=%d, HTTP code=%ld\n",
2000                                         results.curl_result, results.http_code);
2001                         }
2002                 }
2003         }
2004         strbuf_release(&buffer.buf);
2005 }
2006
2007 static int remote_exists(const char *path)
2008 {
2009         char *url = xmalloc(strlen(repo->url) + strlen(path) + 1);
2010         struct active_request_slot *slot;
2011         struct slot_results results;
2012         int ret = -1;
2013
2014         sprintf(url, "%s%s", repo->url, path);
2015
2016         slot = get_active_slot();
2017         slot->results = &results;
2018         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2019         curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
2020
2021         if (start_active_slot(slot)) {
2022                 run_active_slot(slot);
2023                 if (results.http_code == 404)
2024                         ret = 0;
2025                 else if (results.curl_result == CURLE_OK)
2026                         ret = 1;
2027                 else
2028                         fprintf(stderr, "HEAD HTTP error %ld\n", results.http_code);
2029         } else {
2030                 fprintf(stderr, "Unable to start HEAD request\n");
2031         }
2032
2033         free(url);
2034         return ret;
2035 }
2036
2037 static void fetch_symref(const char *path, char **symref, unsigned char *sha1)
2038 {
2039         char *url;
2040         struct strbuf buffer = STRBUF_INIT;
2041         struct active_request_slot *slot;
2042         struct slot_results results;
2043
2044         url = xmalloc(strlen(repo->url) + strlen(path) + 1);
2045         sprintf(url, "%s%s", repo->url, path);
2046
2047         slot = get_active_slot();
2048         slot->results = &results;
2049         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
2050         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
2051         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
2052         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2053         if (start_active_slot(slot)) {
2054                 run_active_slot(slot);
2055                 if (results.curl_result != CURLE_OK) {
2056                         die("Couldn't get %s for remote symref\n%s",
2057                             url, curl_errorstr);
2058                 }
2059         } else {
2060                 die("Unable to start remote symref request");
2061         }
2062         free(url);
2063
2064         free(*symref);
2065         *symref = NULL;
2066         hashclr(sha1);
2067
2068         if (buffer.len == 0)
2069                 return;
2070
2071         /* If it's a symref, set the refname; otherwise try for a sha1 */
2072         if (!prefixcmp((char *)buffer.buf, "ref: ")) {
2073                 *symref = xmemdupz((char *)buffer.buf + 5, buffer.len - 6);
2074         } else {
2075                 get_sha1_hex(buffer.buf, sha1);
2076         }
2077
2078         strbuf_release(&buffer);
2079 }
2080
2081 static int verify_merge_base(unsigned char *head_sha1, unsigned char *branch_sha1)
2082 {
2083         struct commit *head = lookup_commit(head_sha1);
2084         struct commit *branch = lookup_commit(branch_sha1);
2085         struct commit_list *merge_bases = get_merge_bases(head, branch, 1);
2086
2087         return (merge_bases && !merge_bases->next && merge_bases->item == branch);
2088 }
2089
2090 static int delete_remote_branch(char *pattern, int force)
2091 {
2092         struct ref *refs = remote_refs;
2093         struct ref *remote_ref = NULL;
2094         unsigned char head_sha1[20];
2095         char *symref = NULL;
2096         int match;
2097         int patlen = strlen(pattern);
2098         int i;
2099         struct active_request_slot *slot;
2100         struct slot_results results;
2101         char *url;
2102
2103         /* Find the remote branch(es) matching the specified branch name */
2104         for (match = 0; refs; refs = refs->next) {
2105                 char *name = refs->name;
2106                 int namelen = strlen(name);
2107                 if (namelen < patlen ||
2108                     memcmp(name + namelen - patlen, pattern, patlen))
2109                         continue;
2110                 if (namelen != patlen && name[namelen - patlen - 1] != '/')
2111                         continue;
2112                 match++;
2113                 remote_ref = refs;
2114         }
2115         if (match == 0)
2116                 return error("No remote branch matches %s", pattern);
2117         if (match != 1)
2118                 return error("More than one remote branch matches %s",
2119                              pattern);
2120
2121         /*
2122          * Remote HEAD must be a symref (not exactly foolproof; a remote
2123          * symlink to a symref will look like a symref)
2124          */
2125         fetch_symref("HEAD", &symref, head_sha1);
2126         if (!symref)
2127                 return error("Remote HEAD is not a symref");
2128
2129         /* Remote branch must not be the remote HEAD */
2130         for (i=0; symref && i<MAXDEPTH; i++) {
2131                 if (!strcmp(remote_ref->name, symref))
2132                         return error("Remote branch %s is the current HEAD",
2133                                      remote_ref->name);
2134                 fetch_symref(symref, &symref, head_sha1);
2135         }
2136
2137         /* Run extra sanity checks if delete is not forced */
2138         if (!force) {
2139                 /* Remote HEAD must resolve to a known object */
2140                 if (symref)
2141                         return error("Remote HEAD symrefs too deep");
2142                 if (is_zero_sha1(head_sha1))
2143                         return error("Unable to resolve remote HEAD");
2144                 if (!has_sha1_file(head_sha1))
2145                         return error("Remote HEAD resolves to object %s\nwhich does not exist locally, perhaps you need to fetch?", sha1_to_hex(head_sha1));
2146
2147                 /* Remote branch must resolve to a known object */
2148                 if (is_zero_sha1(remote_ref->old_sha1))
2149                         return error("Unable to resolve remote branch %s",
2150                                      remote_ref->name);
2151                 if (!has_sha1_file(remote_ref->old_sha1))
2152                         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));
2153
2154                 /* Remote branch must be an ancestor of remote HEAD */
2155                 if (!verify_merge_base(head_sha1, remote_ref->old_sha1)) {
2156                         return error("The branch '%s' is not an ancestor "
2157                                      "of your current HEAD.\n"
2158                                      "If you are sure you want to delete it,"
2159                                      " run:\n\t'git http-push -D %s %s'",
2160                                      remote_ref->name, repo->url, pattern);
2161                 }
2162         }
2163
2164         /* Send delete request */
2165         fprintf(stderr, "Removing remote branch '%s'\n", remote_ref->name);
2166         if (dry_run)
2167                 return 0;
2168         url = xmalloc(strlen(repo->url) + strlen(remote_ref->name) + 1);
2169         sprintf(url, "%s%s", repo->url, remote_ref->name);
2170         slot = get_active_slot();
2171         slot->results = &results;
2172         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
2173         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_null);
2174         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
2175         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, DAV_DELETE);
2176         if (start_active_slot(slot)) {
2177                 run_active_slot(slot);
2178                 free(url);
2179                 if (results.curl_result != CURLE_OK)
2180                         return error("DELETE request failed (%d/%ld)\n",
2181                                      results.curl_result, results.http_code);
2182         } else {
2183                 free(url);
2184                 return error("Unable to start DELETE request");
2185         }
2186
2187         return 0;
2188 }
2189
2190 void run_request_queue(void)
2191 {
2192 #ifdef USE_CURL_MULTI
2193         is_running_queue = 1;
2194         fill_active_slots();
2195         add_fill_function(NULL, fill_active_slot);
2196 #endif
2197         do {
2198                 finish_all_active_slots();
2199 #ifdef USE_CURL_MULTI
2200                 fill_active_slots();
2201 #endif
2202         } while (request_queue_head && !aborted);
2203
2204 #ifdef USE_CURL_MULTI
2205         is_running_queue = 0;
2206 #endif
2207 }
2208
2209 int main(int argc, char **argv)
2210 {
2211         struct transfer_request *request;
2212         struct transfer_request *next_request;
2213         int nr_refspec = 0;
2214         char **refspec = NULL;
2215         struct remote_lock *ref_lock = NULL;
2216         struct remote_lock *info_ref_lock = NULL;
2217         struct rev_info revs;
2218         int delete_branch = 0;
2219         int force_delete = 0;
2220         int objects_to_send;
2221         int rc = 0;
2222         int i;
2223         int new_refs;
2224         struct ref *ref, *local_refs;
2225         struct remote *remote;
2226         char *rewritten_url = NULL;
2227
2228         git_extract_argv0_path(argv[0]);
2229
2230         setup_git_directory();
2231
2232         repo = xcalloc(sizeof(*repo), 1);
2233
2234         argv++;
2235         for (i = 1; i < argc; i++, argv++) {
2236                 char *arg = *argv;
2237
2238                 if (*arg == '-') {
2239                         if (!strcmp(arg, "--all")) {
2240                                 push_all = MATCH_REFS_ALL;
2241                                 continue;
2242                         }
2243                         if (!strcmp(arg, "--force")) {
2244                                 force_all = 1;
2245                                 continue;
2246                         }
2247                         if (!strcmp(arg, "--dry-run")) {
2248                                 dry_run = 1;
2249                                 continue;
2250                         }
2251                         if (!strcmp(arg, "--verbose")) {
2252                                 push_verbosely = 1;
2253                                 continue;
2254                         }
2255                         if (!strcmp(arg, "-d")) {
2256                                 delete_branch = 1;
2257                                 continue;
2258                         }
2259                         if (!strcmp(arg, "-D")) {
2260                                 delete_branch = 1;
2261                                 force_delete = 1;
2262                                 continue;
2263                         }
2264                 }
2265                 if (!repo->url) {
2266                         char *path = strstr(arg, "//");
2267                         repo->url = arg;
2268                         repo->path_len = strlen(arg);
2269                         if (path) {
2270                                 repo->path = strchr(path+2, '/');
2271                                 if (repo->path)
2272                                         repo->path_len = strlen(repo->path);
2273                         }
2274                         continue;
2275                 }
2276                 refspec = argv;
2277                 nr_refspec = argc - i;
2278                 break;
2279         }
2280
2281 #ifndef USE_CURL_MULTI
2282         die("git-push is not available for http/https repository when not compiled with USE_CURL_MULTI");
2283 #endif
2284
2285         if (!repo->url)
2286                 usage(http_push_usage);
2287
2288         if (delete_branch && nr_refspec != 1)
2289                 die("You must specify only one branch name when deleting a remote branch");
2290
2291         memset(remote_dir_exists, -1, 256);
2292
2293         /*
2294          * Create a minimum remote by hand to give to http_init(),
2295          * primarily to allow it to look at the URL.
2296          */
2297         remote = xcalloc(sizeof(*remote), 1);
2298         ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
2299         remote->url[remote->url_nr++] = repo->url;
2300         http_init(remote);
2301
2302         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
2303
2304         if (repo->url && repo->url[strlen(repo->url)-1] != '/') {
2305                 rewritten_url = xmalloc(strlen(repo->url)+2);
2306                 strcpy(rewritten_url, repo->url);
2307                 strcat(rewritten_url, "/");
2308                 repo->path = rewritten_url + (repo->path - repo->url);
2309                 repo->path_len++;
2310                 repo->url = rewritten_url;
2311         }
2312
2313 #ifdef USE_CURL_MULTI
2314         is_running_queue = 0;
2315 #endif
2316
2317         /* Verify DAV compliance/lock support */
2318         if (!locking_available()) {
2319                 rc = 1;
2320                 goto cleanup;
2321         }
2322
2323         sigchain_push_common(remove_locks_on_signal);
2324
2325         /* Check whether the remote has server info files */
2326         repo->can_update_info_refs = 0;
2327         repo->has_info_refs = remote_exists("info/refs");
2328         repo->has_info_packs = remote_exists("objects/info/packs");
2329         if (repo->has_info_refs) {
2330                 info_ref_lock = lock_remote("info/refs", LOCK_TIME);
2331                 if (info_ref_lock)
2332                         repo->can_update_info_refs = 1;
2333                 else {
2334                         error("cannot lock existing info/refs");
2335                         rc = 1;
2336                         goto cleanup;
2337                 }
2338         }
2339         if (repo->has_info_packs)
2340                 fetch_indices();
2341
2342         /* Get a list of all local and remote heads to validate refspecs */
2343         local_refs = get_local_heads();
2344         fprintf(stderr, "Fetching remote heads...\n");
2345         get_dav_remote_heads();
2346         run_request_queue();
2347
2348         /* Remove a remote branch if -d or -D was specified */
2349         if (delete_branch) {
2350                 if (delete_remote_branch(refspec[0], force_delete) == -1)
2351                         fprintf(stderr, "Unable to delete remote branch %s\n",
2352                                 refspec[0]);
2353                 goto cleanup;
2354         }
2355
2356         /* match them up */
2357         if (!remote_tail)
2358                 remote_tail = &remote_refs;
2359         if (match_refs(local_refs, remote_refs, &remote_tail,
2360                        nr_refspec, (const char **) refspec, push_all)) {
2361                 rc = -1;
2362                 goto cleanup;
2363         }
2364         if (!remote_refs) {
2365                 fprintf(stderr, "No refs in common and none specified; doing nothing.\n");
2366                 rc = 0;
2367                 goto cleanup;
2368         }
2369
2370         new_refs = 0;
2371         for (ref = remote_refs; ref; ref = ref->next) {
2372                 char old_hex[60], *new_hex;
2373                 const char *commit_argv[4];
2374                 int commit_argc;
2375                 char *new_sha1_hex, *old_sha1_hex;
2376
2377                 if (!ref->peer_ref)
2378                         continue;
2379
2380                 if (is_zero_sha1(ref->peer_ref->new_sha1)) {
2381                         if (delete_remote_branch(ref->name, 1) == -1) {
2382                                 error("Could not remove %s", ref->name);
2383                                 rc = -4;
2384                         }
2385                         new_refs++;
2386                         continue;
2387                 }
2388
2389                 if (!hashcmp(ref->old_sha1, ref->peer_ref->new_sha1)) {
2390                         if (push_verbosely || 1)
2391                                 fprintf(stderr, "'%s': up-to-date\n", ref->name);
2392                         continue;
2393                 }
2394
2395                 if (!force_all &&
2396                     !is_zero_sha1(ref->old_sha1) &&
2397                     !ref->force) {
2398                         if (!has_sha1_file(ref->old_sha1) ||
2399                             !ref_newer(ref->peer_ref->new_sha1,
2400                                        ref->old_sha1)) {
2401                                 /*
2402                                  * We do not have the remote ref, or
2403                                  * we know that the remote ref is not
2404                                  * an ancestor of what we are trying to
2405                                  * push.  Either way this can be losing
2406                                  * commits at the remote end and likely
2407                                  * we were not up to date to begin with.
2408                                  */
2409                                 error("remote '%s' is not an ancestor of\n"
2410                                       "local '%s'.\n"
2411                                       "Maybe you are not up-to-date and "
2412                                       "need to pull first?",
2413                                       ref->name,
2414                                       ref->peer_ref->name);
2415                                 rc = -2;
2416                                 continue;
2417                         }
2418                 }
2419                 hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
2420                 new_refs++;
2421                 strcpy(old_hex, sha1_to_hex(ref->old_sha1));
2422                 new_hex = sha1_to_hex(ref->new_sha1);
2423
2424                 fprintf(stderr, "updating '%s'", ref->name);
2425                 if (strcmp(ref->name, ref->peer_ref->name))
2426                         fprintf(stderr, " using '%s'", ref->peer_ref->name);
2427                 fprintf(stderr, "\n  from %s\n  to   %s\n", old_hex, new_hex);
2428                 if (dry_run)
2429                         continue;
2430
2431                 /* Lock remote branch ref */
2432                 ref_lock = lock_remote(ref->name, LOCK_TIME);
2433                 if (ref_lock == NULL) {
2434                         fprintf(stderr, "Unable to lock remote branch %s\n",
2435                                 ref->name);
2436                         rc = 1;
2437                         continue;
2438                 }
2439
2440                 /* Set up revision info for this refspec */
2441                 commit_argc = 3;
2442                 new_sha1_hex = xstrdup(sha1_to_hex(ref->new_sha1));
2443                 old_sha1_hex = NULL;
2444                 commit_argv[1] = "--objects";
2445                 commit_argv[2] = new_sha1_hex;
2446                 if (!push_all && !is_zero_sha1(ref->old_sha1)) {
2447                         old_sha1_hex = xmalloc(42);
2448                         sprintf(old_sha1_hex, "^%s",
2449                                 sha1_to_hex(ref->old_sha1));
2450                         commit_argv[3] = old_sha1_hex;
2451                         commit_argc++;
2452                 }
2453                 init_revisions(&revs, setup_git_directory());
2454                 setup_revisions(commit_argc, commit_argv, &revs, NULL);
2455                 revs.edge_hint = 0; /* just in case */
2456                 free(new_sha1_hex);
2457                 if (old_sha1_hex) {
2458                         free(old_sha1_hex);
2459                         commit_argv[1] = NULL;
2460                 }
2461
2462                 /* Generate a list of objects that need to be pushed */
2463                 pushing = 0;
2464                 if (prepare_revision_walk(&revs))
2465                         die("revision walk setup failed");
2466                 mark_edges_uninteresting(revs.commits, &revs, NULL);
2467                 objects_to_send = get_delta(&revs, ref_lock);
2468                 finish_all_active_slots();
2469
2470                 /* Push missing objects to remote, this would be a
2471                    convenient time to pack them first if appropriate. */
2472                 pushing = 1;
2473                 if (objects_to_send)
2474                         fprintf(stderr, "    sending %d objects\n",
2475                                 objects_to_send);
2476
2477                 run_request_queue();
2478
2479                 /* Update the remote branch if all went well */
2480                 if (aborted || !update_remote(ref->new_sha1, ref_lock))
2481                         rc = 1;
2482
2483                 if (!rc)
2484                         fprintf(stderr, "    done\n");
2485                 unlock_remote(ref_lock);
2486                 check_locks();
2487         }
2488
2489         /* Update remote server info if appropriate */
2490         if (repo->has_info_refs && new_refs) {
2491                 if (info_ref_lock && repo->can_update_info_refs) {
2492                         fprintf(stderr, "Updating remote server info\n");
2493                         if (!dry_run)
2494                                 update_remote_info_refs(info_ref_lock);
2495                 } else {
2496                         fprintf(stderr, "Unable to update server info\n");
2497                 }
2498         }
2499
2500  cleanup:
2501         free(rewritten_url);
2502         if (info_ref_lock)
2503                 unlock_remote(info_ref_lock);
2504         free(repo);
2505
2506         curl_slist_free_all(no_pragma_header);
2507
2508         http_cleanup();
2509
2510         request = request_queue_head;
2511         while (request != NULL) {
2512                 next_request = request->next;
2513                 release_request(request);
2514                 request = next_request;
2515         }
2516
2517         return rc;
2518 }