Hash :
00571828
Author :
Date :
2011-03-12T16:04:46
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
/*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* as published by the Free Software Foundation.
*
* In addition to the permissions in the GNU General Public License,
* the authors give you unlimited permission to link the compiled
* version of this file into combinations with other programs,
* and to distribute those combinations without any restriction
* coming from the use of this file. (The General Public License
* restrictions do apply in other respects; for example, they cover
* modification of the file, and distribution when not linked into
* a combined executable.)
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "refs.h"
#include "hash.h"
#include "repository.h"
#include "fileops.h"
#include <git2/tag.h>
#include <git2/object.h>
#define MAX_NESTING_LEVEL 5
typedef struct {
git_reference ref;
git_oid oid;
git_oid peel_target;
} reference_oid;
typedef struct {
git_reference ref;
char *target;
} reference_symbolic;
static const int default_table_size = 32;
static uint32_t reftable_hash(const void *key, int hash_id)
{
static uint32_t hash_seeds[GIT_HASHTABLE_HASHES] = {
2147483647,
0x5d20bb23,
0x7daaab3c
};
return git__hash(key, strlen((const char *)key), hash_seeds[hash_id]);
}
static void reference_free(git_reference *reference);
static int reference_create(git_reference **ref_out, git_repository *repo, const char *name, git_rtype type);
/* loose refs */
static int loose_parse_symbolic(git_reference *ref, gitfo_buf *file_content);
static int loose_parse_oid(git_reference *ref, gitfo_buf *file_content);
static int loose_read(gitfo_buf *file_content, const char *name, const char *repo_path);
static int loose_lookup( git_reference **ref_out, git_repository *repo, const char *name, int skip_symbolic);
static int loose_write(git_reference *ref);
/* packed refs */
static int packed_readpack(gitfo_buf *packfile, const char *repo_path);
static int packed_parse_peel(reference_oid *tag_ref, const char **buffer_out, const char *buffer_end);
static int packed_parse_oid(reference_oid **ref_out, git_repository *repo, const char **buffer_out, const char *buffer_end);
static int packed_load(git_repository *repo);
static int packed_loadloose(git_repository *repository);
static int packed_write_ref(reference_oid *ref, git_filebuf *file);
static int packed_find_peel(reference_oid *ref);
static int packed_remove_loose(git_repository *repo, git_vector *packing_list);
static int packed_sort(const void *a, const void *b);
static int packed_write(git_repository *repo);
/* name normalization */
static int check_valid_ref_char(char ch);
static int normalize_name(char *buffer_out, const char *name, int is_oid_ref);
/*****************************************
* Internal methods - Constructor/destructor
*****************************************/
static void reference_free(git_reference *reference)
{
if (reference == NULL)
return;
if (reference->name)
free(reference->name);
if (reference->type == GIT_REF_SYMBOLIC)
free(((reference_symbolic *)reference)->target);
free(reference);
}
static int reference_create(
git_reference **ref_out,
git_repository *repo,
const char *name,
git_rtype type)
{
char normalized[MAX_GITDIR_TREE_STRUCTURE_PATH_LENGTH];
int error = GIT_SUCCESS, size;
git_reference *reference = NULL;
assert(ref_out && repo && name);
if (type == GIT_REF_SYMBOLIC)
size = sizeof(reference_symbolic);
else if (type == GIT_REF_OID)
size = sizeof(reference_oid);
else
return GIT_EINVALIDREFSTATE;
reference = git__malloc(size);
if (reference == NULL)
return GIT_ENOMEM;
memset(reference, 0x0, size);
reference->owner = repo;
reference->type = type;
error = normalize_name(normalized, name, (type & GIT_REF_OID));
if (error < GIT_SUCCESS)
goto cleanup;
reference->name = git__strdup(normalized);
if (reference->name == NULL) {
error = GIT_ENOMEM;
goto cleanup;
}
*ref_out = reference;
return error;
cleanup:
reference_free(reference);
return error;
}
/*****************************************
* Internal methods - Loose references
*****************************************/
static int loose_parse_symbolic(git_reference *ref, gitfo_buf *file_content)
{
const unsigned int header_len = strlen(GIT_SYMREF);
const char *refname_start;
char *eol;
reference_symbolic *ref_sym;
refname_start = (const char *)file_content->data;
ref_sym = (reference_symbolic *)ref;
if (file_content->len < (header_len + 1))
return GIT_EREFCORRUPTED;
/*
* Assume we have already checked for the header
* before calling this function
*/
refname_start += header_len;
ref_sym->target = git__strdup(refname_start);
if (ref_sym->target == NULL)
return GIT_ENOMEM;
/* remove newline at the end of file */
eol = strchr(ref_sym->target, '\n');
if (eol == NULL)
return GIT_EREFCORRUPTED;
*eol = '\0';
if (eol[-1] == '\r')
eol[-1] = '\0';
return GIT_SUCCESS;
}
static int loose_parse_oid(git_reference *ref, gitfo_buf *file_content)
{
reference_oid *ref_oid;
char *buffer;
buffer = (char *)file_content->data;
ref_oid = (reference_oid *)ref;
/* File format: 40 chars (OID) + newline */
if (file_content->len < GIT_OID_HEXSZ + 1)
return GIT_EREFCORRUPTED;
if (git_oid_mkstr(&ref_oid->oid, buffer) < GIT_SUCCESS)
return GIT_EREFCORRUPTED;
buffer = buffer + GIT_OID_HEXSZ;
if (*buffer == '\r')
buffer++;
if (*buffer != '\n')
return GIT_EREFCORRUPTED;
return GIT_SUCCESS;
}
static int loose_read(gitfo_buf *file_content, const char *name, const char *repo_path)
{
int error = GIT_SUCCESS;
char ref_path[GIT_PATH_MAX];
/* Determine the full path of the ref */
git__joinpath(ref_path, repo_path, name);
/* Does it even exist ? */
if (gitfo_exists(ref_path) < GIT_SUCCESS)
return GIT_ENOTFOUND;
/* A ref can not be a directory */
if (!gitfo_isdir(ref_path))
return GIT_ENOTFOUND;
if (file_content != NULL)
error = gitfo_read_file(file_content, ref_path);
return error;
}
static git_rtype loose_guess_rtype(const char *full_path)
{
gitfo_buf ref_file = GITFO_BUF_INIT;
git_rtype type;
type = GIT_REF_INVALID;
if (gitfo_read_file(&ref_file, full_path) == GIT_SUCCESS) {
if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0)
type = GIT_REF_SYMBOLIC;
else
type = GIT_REF_OID;
}
gitfo_free_buf(&ref_file);
return type;
}
static int loose_lookup(
git_reference **ref_out,
git_repository *repo,
const char *name,
int skip_symbolic)
{
int error = GIT_SUCCESS;
gitfo_buf ref_file = GITFO_BUF_INIT;
git_reference *ref = NULL;
*ref_out = NULL;
error = loose_read(&ref_file, name, repo->path_repository);
if (error < GIT_SUCCESS)
goto cleanup;
if (git__prefixcmp((const char *)(ref_file.data), GIT_SYMREF) == 0) {
if (skip_symbolic)
return GIT_SUCCESS;
error = reference_create(&ref, repo, name, GIT_REF_SYMBOLIC);
if (error < GIT_SUCCESS)
goto cleanup;
error = loose_parse_symbolic(ref, &ref_file);
} else {
error = reference_create(&ref, repo, name, GIT_REF_OID);
if (error < GIT_SUCCESS)
goto cleanup;
error = loose_parse_oid(ref, &ref_file);
}
if (error < GIT_SUCCESS)
goto cleanup;
*ref_out = ref;
return GIT_SUCCESS;
cleanup:
gitfo_free_buf(&ref_file);
reference_free(ref);
return error;
}
static int loose_write(git_reference *ref)
{
git_filebuf file;
char ref_path[GIT_PATH_MAX];
int error, contents_size;
char *ref_contents = NULL;
assert((ref->type & GIT_REF_PACKED) == 0);
git__joinpath(ref_path, ref->owner->path_repository, ref->name);
if ((error = git_filebuf_open(&file, ref_path, GIT_FILEBUF_FORCE)) < GIT_SUCCESS)
return error;
if (ref->type & GIT_REF_OID) {
reference_oid *ref_oid = (reference_oid *)ref;
contents_size = GIT_OID_HEXSZ + 1;
ref_contents = git__malloc(contents_size);
if (ref_contents == NULL) {
error = GIT_ENOMEM;
goto unlock;
}
git_oid_fmt(ref_contents, &ref_oid->oid);
} else if (ref->type & GIT_REF_SYMBOLIC) { /* GIT_REF_SYMBOLIC */
reference_symbolic *ref_sym = (reference_symbolic *)ref;
contents_size = strlen(GIT_SYMREF) + strlen(ref_sym->target) + 1;
ref_contents = git__malloc(contents_size);
if (ref_contents == NULL) {
error = GIT_ENOMEM;
goto unlock;
}
strcpy(ref_contents, GIT_SYMREF);
strcat(ref_contents, ref_sym->target);
} else {
error = GIT_EINVALIDREFSTATE;
goto unlock;
}
/* TODO: win32 carriage return when writing references in Windows? */
ref_contents[contents_size - 1] = '\n';
if ((error = git_filebuf_write(&file, ref_contents, contents_size)) < GIT_SUCCESS)
goto unlock;
error = git_filebuf_commit(&file);
free(ref_contents);
return error;
unlock:
git_filebuf_cleanup(&file);
free(ref_contents);
return error;
}
/*****************************************
* Internal methods - Packed references
*****************************************/
static int packed_readpack(gitfo_buf *packfile, const char *repo_path)
{
char ref_path[GIT_PATH_MAX];
/* Determine the full path of the file */
git__joinpath(ref_path, repo_path, GIT_PACKEDREFS_FILE);
/* Does it even exist ? */
if (gitfo_exists(ref_path) < GIT_SUCCESS)
return GIT_ENOTFOUND;
return gitfo_read_file(packfile, ref_path);
}
static int packed_parse_peel(
reference_oid *tag_ref,
const char **buffer_out,
const char *buffer_end)
{
const char *buffer = *buffer_out + 1;
assert(buffer[-1] == '^');
/* Ensure it's not the first entry of the file */
if (tag_ref == NULL)
return GIT_EPACKEDREFSCORRUPTED;
/* Ensure reference is a tag */
if (git__prefixcmp(tag_ref->ref.name, GIT_REFS_TAGS_DIR) != 0)
return GIT_EPACKEDREFSCORRUPTED;
if (buffer + GIT_OID_HEXSZ >= buffer_end)
return GIT_EPACKEDREFSCORRUPTED;
/* Is this a valid object id? */
if (git_oid_mkstr(&tag_ref->peel_target, buffer) < GIT_SUCCESS)
return GIT_EPACKEDREFSCORRUPTED;
buffer = buffer + GIT_OID_HEXSZ;
if (*buffer == '\r')
buffer++;
if (*buffer != '\n')
return GIT_EPACKEDREFSCORRUPTED;
*buffer_out = buffer + 1;
tag_ref->ref.type |= GIT_REF_HAS_PEEL;
return GIT_SUCCESS;
}
static int packed_parse_oid(
reference_oid **ref_out,
git_repository *repo,
const char **buffer_out,
const char *buffer_end)
{
reference_oid *ref = NULL;
const char *buffer = *buffer_out;
const char *refname_begin, *refname_end;
int error = GIT_SUCCESS;
int refname_len;
char refname[MAX_GITDIR_TREE_STRUCTURE_PATH_LENGTH];
git_oid id;
refname_begin = (buffer + GIT_OID_HEXSZ + 1);
if (refname_begin >= buffer_end ||
refname_begin[-1] != ' ') {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
/* Is this a valid object id? */
if ((error = git_oid_mkstr(&id, buffer)) < GIT_SUCCESS)
goto cleanup;
refname_end = memchr(refname_begin, '\n', buffer_end - refname_begin);
if (refname_end == NULL) {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
refname_len = refname_end - refname_begin;
memcpy(refname, refname_begin, refname_len);
refname[refname_len] = 0;
if (refname[refname_len - 1] == '\r')
refname[refname_len - 1] = 0;
error = reference_create((git_reference **)&ref, repo, refname, GIT_REF_OID);
if (error < GIT_SUCCESS)
goto cleanup;
git_oid_cpy(&ref->oid, &id);
ref->ref.type |= GIT_REF_PACKED;
*ref_out = ref;
*buffer_out = refname_end + 1;
return GIT_SUCCESS;
cleanup:
reference_free((git_reference *)ref);
return error;
}
static int packed_load(git_repository *repo)
{
int error = GIT_SUCCESS;
gitfo_buf packfile = GITFO_BUF_INIT;
const char *buffer_start, *buffer_end;
git_refcache *ref_cache = &repo->references;
/* already loaded */
if (repo->references.packfile != NULL)
return GIT_SUCCESS;
repo->references.packfile = git_hashtable_alloc(
default_table_size,
reftable_hash,
(git_hash_keyeq_ptr)strcmp);
if (repo->references.packfile == NULL)
return GIT_ENOMEM;
/* read the packfile from disk */
error = packed_readpack(&packfile, repo->path_repository);
/* there is no packfile on disk; that's ok */
if (error == GIT_ENOTFOUND)
return GIT_SUCCESS;
if (error < GIT_SUCCESS)
goto cleanup;
buffer_start = (const char *)packfile.data;
buffer_end = (const char *)(buffer_start) + packfile.len;
/* Does the header look like valid? */
if (git__prefixcmp((const char *)(buffer_start), GIT_PACKEDREFS_HEADER)) {
error = GIT_EPACKEDREFSCORRUPTED;
goto cleanup;
}
/* Let's skip the header */
buffer_start += strlen(GIT_PACKEDREFS_HEADER);
if (*buffer_start == '\r')
buffer_start++;
if (*buffer_start != '\n')
return GIT_EPACKEDREFSCORRUPTED;
buffer_start++;
while (buffer_start < buffer_end) {
reference_oid *ref = NULL;
error = packed_parse_oid(&ref, repo, &buffer_start, buffer_end);
if (error < GIT_SUCCESS)
goto cleanup;
if (buffer_start[0] == '^') {
error = packed_parse_peel(ref, &buffer_start, buffer_end);
if (error < GIT_SUCCESS)
goto cleanup;
}
error = git_hashtable_insert(ref_cache->packfile, ref->ref.name, ref);
if (error < GIT_SUCCESS) {
reference_free((git_reference *)ref);
goto cleanup;
}
}
cleanup:
gitfo_free_buf(&packfile);
return error;
}
struct dirent_list_data {
git_vector ref_list;
size_t repo_path_len;
unsigned int list_flags;
};
static int _dirent_loose_listall(void *_data, char *full_path)
{
struct dirent_list_data *data = (struct dirent_list_data *)_data;
char *file_path;
if (gitfo_isdir(full_path) == GIT_SUCCESS)
return gitfo_dirent(full_path, GIT_PATH_MAX, _dirent_loose_listall, _data);
if ((data->list_flags & loose_guess_rtype(full_path)) == 0)
return GIT_SUCCESS; /* we are filtering out this reference */
file_path = full_path + data->repo_path_len;
return git_vector_insert(&data->ref_list, git__strdup(file_path));
}
static int _dirent_loose_load(void *data, char *full_path)
{
git_repository *repository = (git_repository *)data;
git_reference *reference, *old_ref;
char *file_path;
int error;
if (gitfo_isdir(full_path) == GIT_SUCCESS)
return gitfo_dirent(full_path, GIT_PATH_MAX, _dirent_loose_load, repository);
file_path = full_path + strlen(repository->path_repository);
error = loose_lookup(&reference, repository, file_path, 1);
if (error == GIT_SUCCESS && reference != NULL) {
reference->type |= GIT_REF_PACKED;
if (git_hashtable_insert2(repository->references.packfile, reference->name, reference, (void **)&old_ref) < GIT_SUCCESS) {
reference_free(reference);
return GIT_ENOMEM;
}
if (old_ref != NULL)
reference_free(old_ref);
}
return error;
}
/*
* Load all the loose references from the repository
* into the in-memory Packfile, and build a vector with
* all the references so it can be written back to
* disk.
*/
static int packed_loadloose(git_repository *repository)
{
char refs_path[GIT_PATH_MAX];
/* the packfile must have been previously loaded! */
assert(repository->references.packfile);
git__joinpath(refs_path, repository->path_repository, GIT_REFS_DIR);
/* Remove any loose references from the cache */
{
const void *_unused;
git_reference *reference;
GIT_HASHTABLE_FOREACH(repository->references.loose_cache, _unused, reference,
reference_free(reference);
);
}
git_hashtable_clear(repository->references.loose_cache);
/*
* Load all the loose files from disk into the Packfile table.
* This will overwrite any old packed entries with their
* updated loose versions
*/
return gitfo_dirent(refs_path, GIT_PATH_MAX, _dirent_loose_load, repository);
}
/*
* Write a single reference into a packfile
*/
static int packed_write_ref(reference_oid *ref, git_filebuf *file)
{
int error;
char oid[GIT_OID_HEXSZ + 1];
git_oid_fmt(oid, &ref->oid);
oid[GIT_OID_HEXSZ] = 0;
/*
* For references that peel to an object in the repo, we must
* write the resulting peel on a separate line, e.g.
*
* 6fa8a902cc1d18527e1355773c86721945475d37 refs/tags/libgit2-0.4
* ^2ec0cb7959b0bf965d54f95453f5b4b34e8d3100
*
* This obviously only applies to tags.
* The required peels have already been loaded into `ref->peel_target`.
*/
if (ref->ref.type & GIT_REF_HAS_PEEL) {
char peel[GIT_OID_HEXSZ + 1];
git_oid_fmt(peel, &ref->peel_target);
peel[GIT_OID_HEXSZ] = 0;
error = git_filebuf_printf(file, "%s %s\n^%s\n", oid, ref->ref.name, peel);
} else {
error = git_filebuf_printf(file, "%s %s\n", oid, ref->ref.name);
}
return error;
}
/*
* Find out what object this reference resolves to.
*
* For references that point to a 'big' tag (e.g. an
* actual tag object on the repository), we need to
* cache on the packfile the OID of the object to
* which that 'big tag' is pointing to.
*/
static int packed_find_peel(reference_oid *ref)
{
git_tag *tag;
const git_object *peeled_target;
int error;
if (ref->ref.type & GIT_REF_HAS_PEEL)
return GIT_SUCCESS;
/*
* Only applies to tags, i.e. references
* in the /refs/tags folder
*/
if (git__prefixcmp(ref->ref.name, GIT_REFS_TAGS_DIR) != 0)
return GIT_SUCCESS;
/*
* Find the tag in the repository. The tag must exist,
* otherwise this reference is broken and we shouldn't
* pack it.
*/
error = git_tag_lookup(&tag, ref->ref.owner, &ref->oid);
if (error < GIT_SUCCESS)
return GIT_EOBJCORRUPTED;
/*
* Find the object pointed at by this tag
*/
peeled_target = git_tag_target(tag);
if (peeled_target == NULL)
return GIT_EOBJCORRUPTED;
git_oid_cpy(&ref->peel_target, git_object_id(peeled_target));
ref->ref.type |= GIT_REF_HAS_PEEL;
/*
* The reference has now cached the resolved OID, and is
* marked at such. When written to the packfile, it'll be
* accompanied by this resolved oid
*/
return GIT_SUCCESS;
}
/*
* Remove all loose references
*
* Once we have successfully written a packfile,
* all the loose references that were packed must be
* removed from disk.
*
* This is a dangerous method; make sure the packfile
* is well-written, because we are destructing references
* here otherwise.
*/
static int packed_remove_loose(git_repository *repo, git_vector *packing_list)
{
unsigned int i;
char full_path[GIT_PATH_MAX];
int error = GIT_SUCCESS;
git_reference *reference;
for (i = 0; i < packing_list->length; ++i) {
git_reference *ref = git_vector_get(packing_list, i);
/* Ensure the packed reference doesn't exist
* in a (more up-to-date?) state as a loose reference
*/
reference = git_hashtable_lookup(ref->owner->references.loose_cache, ref->name);
if (reference != NULL)
continue;
git__joinpath(full_path, repo->path_repository, ref->name);
if (gitfo_exists(full_path) == GIT_SUCCESS &&
gitfo_unlink(full_path) < GIT_SUCCESS)
error = GIT_EOSERR;
/*
* if we fail to remove a single file, this is *not* good,
* but we should keep going and remove as many as possible.
* After we've removed as many files as possible, we return
* the error code anyway.
*
* TODO: mark this with a very special error code?
* GIT_EFAILTORMLOOSE
*/
}
return error;
}
static int packed_sort(const void *a, const void *b)
{
const git_reference *ref_a = *(const git_reference **)a;
const git_reference *ref_b = *(const git_reference **)b;
return strcmp(ref_a->name, ref_b->name);
}
/*
* Write all the contents in the in-memory packfile to disk.
*/
static int packed_write(git_repository *repo)
{
git_filebuf pack_file;
int error;
unsigned int i;
char pack_file_path[GIT_PATH_MAX];
git_vector packing_list;
size_t total_refs;
assert(repo && repo->references.packfile);
total_refs = repo->references.packfile->key_count;
if ((error = git_vector_init(&packing_list, total_refs, packed_sort)) < GIT_SUCCESS)
return error;
/* Load all the packfile into a vector */
{
git_reference *reference;
const void *_unused;
GIT_HASHTABLE_FOREACH(repo->references.packfile, _unused, reference,
git_vector_insert(&packing_list, reference); /* cannot fail: vector already has the right size */
);
}
/* sort the vector so the entries appear sorted on the packfile */
git_vector_sort(&packing_list);
/* Now we can open the file! */
git__joinpath(pack_file_path, repo->path_repository, GIT_PACKEDREFS_FILE);
if ((error = git_filebuf_open(&pack_file, pack_file_path, 0)) < GIT_SUCCESS)
return error;
/* Packfiles have a header! */
if ((error = git_filebuf_printf(&pack_file, "%s\n", GIT_PACKEDREFS_HEADER)) < GIT_SUCCESS)
return error;
for (i = 0; i < packing_list.length; ++i) {
reference_oid *ref = (reference_oid *)git_vector_get(&packing_list, i);
/* only direct references go to the packfile; otherwise
* this is a disaster */
assert(ref->ref.type & GIT_REF_OID);
if ((error = packed_find_peel(ref)) < GIT_SUCCESS)
goto cleanup;
if ((error = packed_write_ref(ref, &pack_file)) < GIT_SUCCESS)
goto cleanup;
}
cleanup:
/* if we've written all the references properly, we can commit
* the packfile to make the changes effective */
if (error == GIT_SUCCESS) {
error = git_filebuf_commit(&pack_file);
/* when and only when the packfile has been properly written,
* we can go ahead and remove the loose refs */
if (error == GIT_SUCCESS)
error = packed_remove_loose(repo, &packing_list);
}
else git_filebuf_cleanup(&pack_file);
git_vector_free(&packing_list);
return error;
}
/*****************************************
* External Library API
*****************************************/
/**
* Constructors
*/
int git_reference_lookup(git_reference **ref_out, git_repository *repo, const char *name)
{
int error;
char normalized_name[GIT_PATH_MAX];
assert(ref_out && repo && name);
*ref_out = NULL;
error = normalize_name(normalized_name, name, 0);
if (error < GIT_SUCCESS)
return error;
/* First, check has been previously loaded and cached */
*ref_out = git_hashtable_lookup(repo->references.loose_cache, normalized_name);
if (*ref_out != NULL)
return GIT_SUCCESS;
/* Then check if there is a loose file for that reference.*/
error = loose_lookup(ref_out, repo, normalized_name, 0);
/* If the file exists, we store it on the cache */
if (error == GIT_SUCCESS)
return git_hashtable_insert(repo->references.loose_cache, (*ref_out)->name, (*ref_out));
/* The loose lookup has failed, but not because the reference wasn't found;
* probably the loose reference is corrupted. this is bad. */
if (error != GIT_ENOTFOUND)
return error;
/*
* If we cannot find a loose reference, we look into the packfile
* Load the packfile first if it hasn't been loaded
*/
if (!repo->references.packfile) {
/* load all the packed references */
error = packed_load(repo);
if (error < GIT_SUCCESS)
return error;
}
/* Look up on the packfile */
*ref_out = git_hashtable_lookup(repo->references.packfile, normalized_name);
if (*ref_out != NULL)
return GIT_SUCCESS;
/* The reference doesn't exist anywhere */
return GIT_ENOTFOUND;
}
int git_reference_create_symbolic(git_reference **ref_out, git_repository *repo, const char *name, const char *target)
{
char normalized[MAX_GITDIR_TREE_STRUCTURE_PATH_LENGTH];
int error = GIT_SUCCESS;
git_reference *ref = NULL;
error = reference_create(&ref, repo, name, GIT_REF_SYMBOLIC);
if (error < GIT_SUCCESS)
goto cleanup;
/* The target can aither be the name of an object id reference or the name of another symbolic reference */
error = normalize_name(normalized, target, 0);
if (error < GIT_SUCCESS)
goto cleanup;
/* set the target; this will write the reference on disk */
error = git_reference_set_target(ref, normalized);
if (error < GIT_SUCCESS)
goto cleanup;
error = git_hashtable_insert(repo->references.loose_cache, ref->name, ref);
if (error < GIT_SUCCESS)
goto cleanup;
*ref_out = ref;
return error;
cleanup:
reference_free(ref);
return error;
}
int git_reference_create_oid(git_reference **ref_out, git_repository *repo, const char *name, const git_oid *id)
{
int error = GIT_SUCCESS;
git_reference *ref = NULL;
error = reference_create(&ref, repo, name, GIT_REF_OID);
if (error < GIT_SUCCESS)
goto cleanup;
/* set the oid; this will write the reference on disk */
error = git_reference_set_oid(ref, id);
if (error < GIT_SUCCESS)
goto cleanup;
error = git_hashtable_insert(repo->references.loose_cache, ref->name, ref);
if (error < GIT_SUCCESS)
goto cleanup;
*ref_out = ref;
return error;
cleanup:
reference_free(ref);
return error;
}
/**
* Getters
*/
git_rtype git_reference_type(git_reference *ref)
{
assert(ref);
if (ref->type & GIT_REF_OID)
return GIT_REF_OID;
if (ref->type & GIT_REF_SYMBOLIC)
return GIT_REF_SYMBOLIC;
return GIT_REF_INVALID;
}
const char *git_reference_name(git_reference *ref)
{
assert(ref);
return ref->name;
}
git_repository *git_reference_owner(git_reference *ref)
{
assert(ref);
return ref->owner;
}
const git_oid *git_reference_oid(git_reference *ref)
{
assert(ref);
if ((ref->type & GIT_REF_OID) == 0)
return NULL;
return &((reference_oid *)ref)->oid;
}
const char *git_reference_target(git_reference *ref)
{
assert(ref);
if ((ref->type & GIT_REF_SYMBOLIC) == 0)
return NULL;
return ((reference_symbolic *)ref)->target;
}
/**
* Setters
*/
/*
* Change the OID target of a reference.
*
* For loose references, just change the oid in memory
* and overwrite the file in disk.
*
* For packed files, this is not pretty:
* For performance reasons, we write the new reference
* loose on disk (it replaces the old on the packfile),
* but we cannot invalidate the pointer to the reference,
* and most importantly, the `packfile` object must stay
* consistent with the representation of the packfile
* on disk. This is what we need to:
*
* 1. Copy the reference
* 2. Change the oid on the original
* 3. Write the original to disk
* 4. Write the original to the loose cache
* 5. Replace the original with the copy (old reference) in the packfile cache
*/
int git_reference_set_oid(git_reference *ref, const git_oid *id)
{
reference_oid *ref_oid;
reference_oid *ref_old = NULL;
int error = GIT_SUCCESS;
if ((ref->type & GIT_REF_OID) == 0)
return GIT_EINVALIDREFSTATE;
ref_oid = (reference_oid *)ref;
/* duplicate the reference;
* this copy will stay on the packfile cache */
if (ref->type & GIT_REF_PACKED) {
ref_old = git__malloc(sizeof(reference_oid));
if (ref_old == NULL)
return GIT_ENOMEM;
ref_old->ref.name = git__strdup(ref->name);
if (ref_old->ref.name == NULL) {
free(ref_old);
return GIT_ENOMEM;
}
}
git_oid_cpy(&ref_oid->oid, id);
ref->type &= ~GIT_REF_HAS_PEEL;
error = loose_write(ref);
if (error < GIT_SUCCESS)
goto cleanup;
if (ref->type & GIT_REF_PACKED) {
/* insert the original on the loose cache */
error = git_hashtable_insert(ref->owner->references.loose_cache, ref->name, ref);
if (error < GIT_SUCCESS)
goto cleanup;
ref->type &= ~GIT_REF_PACKED;
/* replace the original in the packfile with the copy */
error = git_hashtable_insert(ref->owner->references.packfile, ref_old->ref.name, ref_old);
if (error < GIT_SUCCESS)
goto cleanup;
}
return GIT_SUCCESS;
cleanup:
reference_free((git_reference *)ref_old);
return error;
}
/*
* Change the target of a symbolic reference.
*
* This is easy because symrefs cannot be inside
* a pack. We just change the target in memory
* and overwrite the file on disk.
*/
int git_reference_set_target(git_reference *ref, const char *target)
{
reference_symbolic *ref_sym;
if ((ref->type & GIT_REF_SYMBOLIC) == 0)
return GIT_EINVALIDREFSTATE;
ref_sym = (reference_symbolic *)ref;
free(ref_sym->target);
ref_sym->target = git__strdup(target);
if (ref_sym->target == NULL)
return GIT_ENOMEM;
return loose_write(ref);
}
/**
* Other
*/
/*
* Delete a reference.
*
* If the reference is packed, this is an expensive
* operation. We need to remove the reference from
* the memory cache and then rewrite the whole pack
*
* If the reference is loose, we remove it on
* the filesystem and update the in-memory cache
* accordingly. We also make sure that an older version
* of it doesn't exist as a packed reference. If this
* is the case, this packed reference is removed as well.
*
* This obviously invalidates the `ref` pointer.
*/
int git_reference_delete(git_reference *ref)
{
int error;
git_reference *reference;
assert(ref);
if (ref->type & GIT_REF_PACKED) {
git_hashtable_remove(ref->owner->references.packfile, ref->name);
error = packed_write(ref->owner);
} else {
char full_path[GIT_PATH_MAX];
git__joinpath(full_path, ref->owner->path_repository, ref->name);
git_hashtable_remove(ref->owner->references.loose_cache, ref->name);
error = gitfo_unlink(full_path);
if (error < GIT_SUCCESS)
goto cleanup;
/* When deleting a loose reference, we have to ensure that an older
* packed version of it doesn't exist
*/
if (!git_reference_lookup(&reference, ref->owner, ref->name)) {
assert((reference->type & GIT_REF_PACKED) != 0);
error = git_reference_delete(reference);
}
}
cleanup:
reference_free(ref);
return error;
}
/*
* Rename a reference
*
* If the reference is packed, we need to rewrite the
* packfile to remove the reference from it and create
* the reference back as a loose one.
*
* If the reference is loose, we just rename it on
* the filesystem.
*
* We also need to re-insert the reference on its corresponding
* in-memory cache, since the caches are indexed by refname.
*/
int git_reference_rename(git_reference *ref, const char *new_name)
{
int error;
char *old_name;
char old_path[GIT_PATH_MAX], new_path[GIT_PATH_MAX], normalized_name[MAX_GITDIR_TREE_STRUCTURE_PATH_LENGTH];
git_reference *looked_up_ref;
assert(ref);
/* Ensure the name is valid */
error = normalize_name(normalized_name, new_name, ref->type & GIT_REF_OID);
if (error < GIT_SUCCESS)
return error;
/* Ensure we're not going to overwrite an existing reference */
error = git_reference_lookup(&looked_up_ref, ref->owner, new_name);
if (error == GIT_SUCCESS)
return GIT_EINVALIDREFNAME;
if (error != GIT_ENOTFOUND)
return error;
old_name = ref->name;
ref->name = git__strdup(new_name);
if (ref->name == NULL) {
ref->name = old_name;
return GIT_ENOMEM;
}
if (ref->type & GIT_REF_PACKED) {
/* write the packfile to disk; note
* that the state of the in-memory cache is not
* consistent, because the reference is indexed
* by its old name but it already has the new one.
* This doesn't affect writing, though, and allows
* us to rollback if writing fails
*/
ref->type &= ~GIT_REF_PACKED;
/* Create the loose ref under its new name */
error = loose_write(ref);
if (error < GIT_SUCCESS) {
ref->type |= GIT_REF_PACKED;
goto cleanup;
}
/* Remove from the packfile cache in order to avoid packing it back
* Note : we do not rely on git_reference_delete() because this would
* invalidate the reference.
*/
git_hashtable_remove(ref->owner->references.packfile, old_name);
/* Recreate the packed-refs file without the reference */
error = packed_write(ref->owner);
if (error < GIT_SUCCESS)
goto rename_loose_to_old_name;
} else {
git__joinpath(old_path, ref->owner->path_repository, old_name);
git__joinpath(new_path, ref->owner->path_repository, ref->name);
error = gitfo_mv_force(old_path, new_path);
if (error < GIT_SUCCESS)
goto cleanup;
/* Once succesfully renamed, remove from the cache the reference known by its old name*/
git_hashtable_remove(ref->owner->references.loose_cache, old_name);
}
/* Store the renamed reference into the loose ref cache */
error = git_hashtable_insert(ref->owner->references.loose_cache, ref->name, ref);
free(old_name);
return error;
cleanup:
/* restore the old name if this failed */
free(ref->name);
ref->name = old_name;
return error;
rename_loose_to_old_name:
/* If we hit this point. Something *bad* happened! Think "Ghostbusters
* crossing the streams" definition of bad.
* Either the packed-refs has been correctly generated and something else
* has gone wrong, or the writing of the new packed-refs has failed, and
* we're stuck with the old one. As a loose ref always takes priority over
* a packed ref, we'll eventually try and rename the generated loose ref to
* its former name. It even that fails, well... we might have lost the reference
* for good. :-/
*/
git__joinpath(old_path, ref->owner->path_repository, ref->name);
git__joinpath(new_path, ref->owner->path_repository, old_name);
/* No error checking. We'll return the initial error */
gitfo_mv_force(old_path, new_path);
/* restore the old name */
free(ref->name);
ref->name = old_name;
return error;
}
int git_reference_resolve(git_reference **resolved_ref, git_reference *ref)
{
git_repository *repo;
int error, i;
assert(resolved_ref && ref);
*resolved_ref = NULL;
repo = ref->owner;
for (i = 0; i < MAX_NESTING_LEVEL; ++i) {
reference_symbolic *ref_sym;
if (ref->type & GIT_REF_OID) {
*resolved_ref = ref;
return GIT_SUCCESS;
}
ref_sym = (reference_symbolic *)ref;
if ((error = git_reference_lookup(&ref, repo, ref_sym->target)) < GIT_SUCCESS)
return error;
}
return GIT_ETOONESTEDSYMREF;
}
int git_reference_packall(git_repository *repo)
{
int error;
/* load the existing packfile */
if ((error = packed_load(repo)) < GIT_SUCCESS)
return error;
/* update it in-memory with all the loose references */
if ((error = packed_loadloose(repo)) < GIT_SUCCESS)
return error;
/* write it back to disk */
return packed_write(repo);
}
int git_reference_listall(git_strarray *array, git_repository *repo, unsigned int list_flags)
{
int error;
struct dirent_list_data data;
char refs_path[GIT_PATH_MAX];
array->strings = NULL;
array->count = 0;
git_vector_init(&data.ref_list, 8, NULL);
data.repo_path_len = strlen(repo->path_repository);
data.list_flags = list_flags;
git__joinpath(refs_path, repo->path_repository, GIT_REFS_DIR);
error = gitfo_dirent(refs_path, GIT_PATH_MAX, _dirent_loose_listall, &data);
if (error < GIT_SUCCESS) {
git_vector_free(&data.ref_list);
return error;
}
if (list_flags & GIT_REF_PACKED) {
const char *ref_name;
void *_unused;
if ((error = packed_load(repo)) < GIT_SUCCESS) {
git_vector_free(&data.ref_list);
return error;
}
GIT_HASHTABLE_FOREACH(repo->references.packfile, ref_name, _unused,
git_vector_insert(&data.ref_list, git__strdup(ref_name));
);
}
array->strings = (char **)data.ref_list.contents;
array->count = data.ref_list.length;
return GIT_SUCCESS;
}
/*****************************************
* Init/free (repository API)
*****************************************/
int git_repository__refcache_init(git_refcache *refs)
{
assert(refs);
refs->loose_cache = git_hashtable_alloc(
default_table_size,
reftable_hash,
(git_hash_keyeq_ptr)strcmp);
/* packfile loaded lazily */
refs->packfile = NULL;
return (refs->loose_cache) ? GIT_SUCCESS : GIT_ENOMEM;
}
void git_repository__refcache_free(git_refcache *refs)
{
git_reference *reference;
const void *_unused;
assert(refs);
GIT_HASHTABLE_FOREACH(refs->loose_cache, _unused, reference,
reference_free(reference);
);
git_hashtable_free(refs->loose_cache);
if (refs->packfile) {
GIT_HASHTABLE_FOREACH(refs->packfile, _unused, reference,
reference_free(reference);
);
git_hashtable_free(refs->packfile);
}
}
/*****************************************
* Name normalization
*****************************************/
static int check_valid_ref_char(char ch)
{
if (ch <= ' ')
return GIT_ERROR;
switch (ch) {
case '~':
case '^':
case ':':
case '\\':
case '?':
case '[':
case '*':
return GIT_ERROR;
break;
default:
return GIT_SUCCESS;
}
}
static int normalize_name(char *buffer_out, const char *name, int is_oid_ref)
{
int error = GIT_SUCCESS;
const char *name_end, *buffer_out_start;
char *current;
int contains_a_slash = 0;
assert(name && buffer_out);
buffer_out_start = buffer_out;
current = (char *)name;
name_end = name + strlen(name);
/* A refname can not be empty */
if (name_end == name)
return GIT_EINVALIDREFNAME;
/* A refname can not end with a dot or a slash */
if (*(name_end - 1) == '.' || *(name_end - 1) == '/')
return GIT_EINVALIDREFNAME;
while (current < name_end) {
if (check_valid_ref_char(*current))
return GIT_EINVALIDREFNAME;
if (buffer_out > buffer_out_start) {
char prev = *(buffer_out - 1);
/* A refname can not start with a dot nor contain a double dot */
if (*current == '.' && ((prev == '.') || (prev == '/')))
return GIT_EINVALIDREFNAME;
/* '@{' is forbidden within a refname */
if (*current == '{' && prev == '@')
return GIT_EINVALIDREFNAME;
/* Prevent multiple slashes from being added to the output */
if (*current == '/' && prev == '/') {
current++;
continue;
}
}
if (*current == '/')
contains_a_slash = 1;
*buffer_out++ = *current++;
}
/* Object id refname have to contain at least one slash */
if (is_oid_ref && !contains_a_slash)
return GIT_EINVALIDREFNAME;
/* A refname can not end with ".lock" */
if (!git__suffixcmp(name, GIT_FILELOCK_EXTENSION))
return GIT_EINVALIDREFNAME;
*buffer_out = '\0';
/* For object id references, name has to start with refs/(heads|tags|remotes) */
if (is_oid_ref && !(!git__prefixcmp(buffer_out_start, GIT_REFS_HEADS_DIR) ||
!git__prefixcmp(buffer_out_start, GIT_REFS_TAGS_DIR) || !git__prefixcmp(buffer_out_start, GIT_REFS_REMOTES_DIR)))
return GIT_EINVALIDREFNAME;
return error;
}
int git_reference__normalize_name(char *buffer_out, const char *name)
{
return normalize_name(buffer_out, name, 0);
}
int git_reference__normalize_name_oid(char *buffer_out, const char *name)
{
return normalize_name(buffer_out, name, 1);
}