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