1#ifndef CACHE_H 2#define CACHE_H 3 4#include"git-compat-util.h" 5#include"strbuf.h" 6#include"hashmap.h" 7#include"mru.h" 8#include"advice.h" 9#include"gettext.h" 10#include"convert.h" 11#include"trace.h" 12#include"string-list.h" 13#include"pack-revindex.h" 14#include"hash.h" 15#include"path.h" 16#include"sha1-array.h" 17 18#ifndef platform_SHA_CTX 19/* 20 * platform's underlying implementation of SHA-1; could be OpenSSL, 21 * blk_SHA, Apple CommonCrypto, etc... Note that including 22 * SHA1_HEADER may have already defined platform_SHA_CTX for our 23 * own implementations like block-sha1 and ppc-sha1, so we list 24 * the default for OpenSSL compatible SHA-1 implementations here. 25 */ 26#define platform_SHA_CTX SHA_CTX 27#define platform_SHA1_Init SHA1_Init 28#define platform_SHA1_Update SHA1_Update 29#define platform_SHA1_Final SHA1_Final 30#endif 31 32#define git_SHA_CTX platform_SHA_CTX 33#define git_SHA1_Init platform_SHA1_Init 34#define git_SHA1_Update platform_SHA1_Update 35#define git_SHA1_Final platform_SHA1_Final 36 37#ifdef SHA1_MAX_BLOCK_SIZE 38#include"compat/sha1-chunked.h" 39#undef git_SHA1_Update 40#define git_SHA1_Update git_SHA1_Update_Chunked 41#endif 42 43#include <zlib.h> 44typedefstruct git_zstream { 45 z_stream z; 46unsigned long avail_in; 47unsigned long avail_out; 48unsigned long total_in; 49unsigned long total_out; 50unsigned char*next_in; 51unsigned char*next_out; 52} git_zstream; 53 54voidgit_inflate_init(git_zstream *); 55voidgit_inflate_init_gzip_only(git_zstream *); 56voidgit_inflate_end(git_zstream *); 57intgit_inflate(git_zstream *,int flush); 58 59voidgit_deflate_init(git_zstream *,int level); 60voidgit_deflate_init_gzip(git_zstream *,int level); 61voidgit_deflate_init_raw(git_zstream *,int level); 62voidgit_deflate_end(git_zstream *); 63intgit_deflate_abort(git_zstream *); 64intgit_deflate_end_gently(git_zstream *); 65intgit_deflate(git_zstream *,int flush); 66unsigned longgit_deflate_bound(git_zstream *,unsigned long); 67 68/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 69#define GIT_SHA1_RAWSZ 20 70#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 71 72/* The length in byte and in hex digits of the largest possible hash value. */ 73#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ 74#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ 75 76struct object_id { 77unsigned char hash[GIT_MAX_RAWSZ]; 78}; 79 80#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 81#define DTYPE(de) ((de)->d_type) 82#else 83#undef DT_UNKNOWN 84#undef DT_DIR 85#undef DT_REG 86#undef DT_LNK 87#define DT_UNKNOWN 0 88#define DT_DIR 1 89#define DT_REG 2 90#define DT_LNK 3 91#define DTYPE(de) DT_UNKNOWN 92#endif 93 94/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 95#define S_IFINVALID 0030000 96 97/* 98 * A "directory link" is a link to another git directory. 99 * 100 * The value 0160000 is not normally a valid mode, and 101 * also just happens to be S_IFDIR + S_IFLNK 102 */ 103#define S_IFGITLINK 0160000 104#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 105 106/* 107 * Some mode bits are also used internally for computations. 108 * 109 * They *must* not overlap with any valid modes, and they *must* not be emitted 110 * to outside world - i.e. appear on disk or network. In other words, it's just 111 * temporary fields, which we internally use, but they have to stay in-house. 112 * 113 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 114 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 115 */ 116 117/* used internally in tree-diff */ 118#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 119 120 121/* 122 * Intensive research over the course of many years has shown that 123 * port 9418 is totally unused by anything else. Or 124 * 125 * Your search - "port 9418" - did not match any documents. 126 * 127 * as www.google.com puts it. 128 * 129 * This port has been properly assigned for git use by IANA: 130 * git (Assigned-9418) [I06-050728-0001]. 131 * 132 * git 9418/tcp git pack transfer service 133 * git 9418/udp git pack transfer service 134 * 135 * with Linus Torvalds <torvalds@osdl.org> as the point of 136 * contact. September 2005. 137 * 138 * See http://www.iana.org/assignments/port-numbers 139 */ 140#define DEFAULT_GIT_PORT 9418 141 142/* 143 * Basic data structures for the directory cache 144 */ 145 146#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 147struct cache_header { 148uint32_t hdr_signature; 149uint32_t hdr_version; 150uint32_t hdr_entries; 151}; 152 153#define INDEX_FORMAT_LB 2 154#define INDEX_FORMAT_UB 4 155 156/* 157 * The "cache_time" is just the low 32 bits of the 158 * time. It doesn't matter if it overflows - we only 159 * check it for equality in the 32 bits we save. 160 */ 161struct cache_time { 162uint32_t sec; 163uint32_t nsec; 164}; 165 166struct stat_data { 167struct cache_time sd_ctime; 168struct cache_time sd_mtime; 169unsigned int sd_dev; 170unsigned int sd_ino; 171unsigned int sd_uid; 172unsigned int sd_gid; 173unsigned int sd_size; 174}; 175 176struct cache_entry { 177struct hashmap_entry ent; 178struct stat_data ce_stat_data; 179unsigned int ce_mode; 180unsigned int ce_flags; 181unsigned int ce_namelen; 182unsigned int index;/* for link extension */ 183struct object_id oid; 184char name[FLEX_ARRAY];/* more */ 185}; 186 187#define CE_STAGEMASK (0x3000) 188#define CE_EXTENDED (0x4000) 189#define CE_VALID (0x8000) 190#define CE_STAGESHIFT 12 191 192/* 193 * Range 0xFFFF0FFF in ce_flags is divided into 194 * two parts: in-memory flags and on-disk ones. 195 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 196 * if you want to save a new flag, add it in 197 * CE_EXTENDED_FLAGS 198 * 199 * In-memory only flags 200 */ 201#define CE_UPDATE (1 << 16) 202#define CE_REMOVE (1 << 17) 203#define CE_UPTODATE (1 << 18) 204#define CE_ADDED (1 << 19) 205 206#define CE_HASHED (1 << 20) 207#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 208#define CE_CONFLICTED (1 << 23) 209 210#define CE_UNPACKED (1 << 24) 211#define CE_NEW_SKIP_WORKTREE (1 << 25) 212 213/* used to temporarily mark paths matched by pathspecs */ 214#define CE_MATCHED (1 << 26) 215 216#define CE_UPDATE_IN_BASE (1 << 27) 217#define CE_STRIP_NAME (1 << 28) 218 219/* 220 * Extended on-disk flags 221 */ 222#define CE_INTENT_TO_ADD (1 << 29) 223#define CE_SKIP_WORKTREE (1 << 30) 224/* CE_EXTENDED2 is for future extension */ 225#define CE_EXTENDED2 (1U << 31) 226 227#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 228 229/* 230 * Safeguard to avoid saving wrong flags: 231 * - CE_EXTENDED2 won't get saved until its semantic is known 232 * - Bits in 0x0000FFFF have been saved in ce_flags already 233 * - Bits in 0x003F0000 are currently in-memory flags 234 */ 235#if CE_EXTENDED_FLAGS & 0x803FFFFF 236#error"CE_EXTENDED_FLAGS out of range" 237#endif 238 239/* Forward structure decls */ 240struct pathspec; 241struct child_process; 242 243/* 244 * Copy the sha1 and stat state of a cache entry from one to 245 * another. But we never change the name, or the hash state! 246 */ 247staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 248const struct cache_entry *src) 249{ 250unsigned int state = dst->ce_flags & CE_HASHED; 251 252/* Don't copy hash chain and name */ 253memcpy(&dst->ce_stat_data, &src->ce_stat_data, 254offsetof(struct cache_entry, name) - 255offsetof(struct cache_entry, ce_stat_data)); 256 257/* Restore the hash state */ 258 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 259} 260 261staticinlineunsignedcreate_ce_flags(unsigned stage) 262{ 263return(stage << CE_STAGESHIFT); 264} 265 266#define ce_namelen(ce) ((ce)->ce_namelen) 267#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 268#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 269#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 270#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 271#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 272#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 273 274#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 275staticinlineunsigned intcreate_ce_mode(unsigned int mode) 276{ 277if(S_ISLNK(mode)) 278return S_IFLNK; 279if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 280return S_IFGITLINK; 281return S_IFREG |ce_permissions(mode); 282} 283staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 284unsigned int mode) 285{ 286externint trust_executable_bit, has_symlinks; 287if(!has_symlinks &&S_ISREG(mode) && 288 ce &&S_ISLNK(ce->ce_mode)) 289return ce->ce_mode; 290if(!trust_executable_bit &&S_ISREG(mode)) { 291if(ce &&S_ISREG(ce->ce_mode)) 292return ce->ce_mode; 293returncreate_ce_mode(0666); 294} 295returncreate_ce_mode(mode); 296} 297staticinlineintce_to_dtype(const struct cache_entry *ce) 298{ 299unsigned ce_mode =ntohl(ce->ce_mode); 300if(S_ISREG(ce_mode)) 301return DT_REG; 302else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 303return DT_DIR; 304else if(S_ISLNK(ce_mode)) 305return DT_LNK; 306else 307return DT_UNKNOWN; 308} 309staticinlineunsigned intcanon_mode(unsigned int mode) 310{ 311if(S_ISREG(mode)) 312return S_IFREG |ce_permissions(mode); 313if(S_ISLNK(mode)) 314return S_IFLNK; 315if(S_ISDIR(mode)) 316return S_IFDIR; 317return S_IFGITLINK; 318} 319 320#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 321 322#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 323#define CE_ENTRY_CHANGED (1 << 1) 324#define CE_ENTRY_REMOVED (1 << 2) 325#define CE_ENTRY_ADDED (1 << 3) 326#define RESOLVE_UNDO_CHANGED (1 << 4) 327#define CACHE_TREE_CHANGED (1 << 5) 328#define SPLIT_INDEX_ORDERED (1 << 6) 329#define UNTRACKED_CHANGED (1 << 7) 330 331struct split_index; 332struct untracked_cache; 333 334struct index_state { 335struct cache_entry **cache; 336unsigned int version; 337unsigned int cache_nr, cache_alloc, cache_changed; 338struct string_list *resolve_undo; 339struct cache_tree *cache_tree; 340struct split_index *split_index; 341struct cache_time timestamp; 342unsigned name_hash_initialized :1, 343 initialized :1; 344struct hashmap name_hash; 345struct hashmap dir_hash; 346unsigned char sha1[20]; 347struct untracked_cache *untracked; 348}; 349 350externstruct index_state the_index; 351 352/* Name hashing */ 353externinttest_lazy_init_name_hash(struct index_state *istate,int try_threaded); 354externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 355externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 356externvoidfree_name_hash(struct index_state *istate); 357 358 359#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 360#define active_cache (the_index.cache) 361#define active_nr (the_index.cache_nr) 362#define active_alloc (the_index.cache_alloc) 363#define active_cache_changed (the_index.cache_changed) 364#define active_cache_tree (the_index.cache_tree) 365 366#define read_cache() read_index(&the_index) 367#define read_cache_from(path) read_index_from(&the_index, (path), (get_git_dir())) 368#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 369#define is_cache_unborn() is_index_unborn(&the_index) 370#define read_cache_unmerged() read_index_unmerged(&the_index) 371#define discard_cache() discard_index(&the_index) 372#define unmerged_cache() unmerged_index(&the_index) 373#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 374#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 375#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 376#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 377#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 378#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 379#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 380#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 381#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 382#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 383#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 384#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 385#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 386#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 387#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 388#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 389#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 390#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 391#endif 392 393enum object_type { 394 OBJ_BAD = -1, 395 OBJ_NONE =0, 396 OBJ_COMMIT =1, 397 OBJ_TREE =2, 398 OBJ_BLOB =3, 399 OBJ_TAG =4, 400/* 5 for future expansion */ 401 OBJ_OFS_DELTA =6, 402 OBJ_REF_DELTA =7, 403 OBJ_ANY, 404 OBJ_MAX 405}; 406 407staticinlineenum object_type object_type(unsigned int mode) 408{ 409returnS_ISDIR(mode) ? OBJ_TREE : 410S_ISGITLINK(mode) ? OBJ_COMMIT : 411 OBJ_BLOB; 412} 413 414/* Double-check local_repo_env below if you add to this list. */ 415#define GIT_DIR_ENVIRONMENT"GIT_DIR" 416#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 417#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 418#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 419#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 420#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 421#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 422#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 423#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 424#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 425#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 426#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 427#define CONFIG_ENVIRONMENT"GIT_CONFIG" 428#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 429#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 430#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 431#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 432#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 433#define GITATTRIBUTES_FILE".gitattributes" 434#define INFOATTRIBUTES_FILE"info/attributes" 435#define ATTRIBUTE_MACRO_PREFIX"[attr]" 436#define GITMODULES_FILE".gitmodules" 437#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 438#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 439#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 440#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 441#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 442#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 443#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 444#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 445#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 446#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 447#define GIT_OPTIONAL_LOCKS_ENVIRONMENT"GIT_OPTIONAL_LOCKS" 448 449/* 450 * This environment variable is expected to contain a boolean indicating 451 * whether we should or should not treat: 452 * 453 * GIT_DIR=foo.git git ... 454 * 455 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 456 * of this, but we use it internally to communicate to sub-processes that we 457 * are in a bare repo. If not set, defaults to true. 458 */ 459#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 460 461/* 462 * Repository-local GIT_* environment variables; these will be cleared 463 * when git spawns a sub-process that runs inside another repository. 464 * The array is NULL-terminated, which makes it easy to pass in the "env" 465 * parameter of a run-command invocation, or to do a simple walk. 466 */ 467externconst char*const local_repo_env[]; 468 469externvoidsetup_git_env(void); 470 471/* 472 * Returns true iff we have a configured git repository (either via 473 * setup_git_directory, or in the environment via $GIT_DIR). 474 */ 475inthave_git_dir(void); 476 477externint is_bare_repository_cfg; 478externintis_bare_repository(void); 479externintis_inside_git_dir(void); 480externchar*git_work_tree_cfg; 481externintis_inside_work_tree(void); 482externconst char*get_git_dir(void); 483externconst char*get_git_common_dir(void); 484externchar*get_object_directory(void); 485externchar*get_index_file(void); 486externchar*get_graft_file(void); 487externintset_git_dir(const char*path); 488externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 489externintget_common_dir(struct strbuf *sb,const char*gitdir); 490externconst char*get_git_namespace(void); 491externconst char*strip_namespace(const char*namespaced_ref); 492externconst char*get_super_prefix(void); 493externconst char*get_git_work_tree(void); 494 495/* 496 * Return true if the given path is a git directory; note that this _just_ 497 * looks at the directory itself. If you want to know whether "foo/.git" 498 * is a repository, you must feed that path, not just "foo". 499 */ 500externintis_git_directory(const char*path); 501 502/* 503 * Return 1 if the given path is the root of a git repository or 504 * submodule, else 0. Will not return 1 for bare repositories with the 505 * exception of creating a bare repository in "foo/.git" and calling 506 * is_git_repository("foo"). 507 * 508 * If we run into read errors, we err on the side of saying "yes, it is", 509 * as we usually consider sub-repos precious, and would prefer to err on the 510 * side of not disrupting or deleting them. 511 */ 512externintis_nonbare_repository_dir(struct strbuf *path); 513 514#define READ_GITFILE_ERR_STAT_FAILED 1 515#define READ_GITFILE_ERR_NOT_A_FILE 2 516#define READ_GITFILE_ERR_OPEN_FAILED 3 517#define READ_GITFILE_ERR_READ_FAILED 4 518#define READ_GITFILE_ERR_INVALID_FORMAT 5 519#define READ_GITFILE_ERR_NO_PATH 6 520#define READ_GITFILE_ERR_NOT_A_REPO 7 521#define READ_GITFILE_ERR_TOO_LARGE 8 522externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 523externconst char*read_gitfile_gently(const char*path,int*return_error_code); 524#define read_gitfile(path) read_gitfile_gently((path), NULL) 525externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 526#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 527 528externvoidset_git_work_tree(const char*tree); 529 530#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 531 532externvoidsetup_work_tree(void); 533/* 534 * Find the commondir and gitdir of the repository that contains the current 535 * working directory, without changing the working directory or other global 536 * state. The result is appended to commondir and gitdir. If the discovered 537 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 538 * both have the same result appended to the buffer. The return value is 539 * either 0 upon success and non-zero if no repository was found. 540 */ 541externintdiscover_git_directory(struct strbuf *commondir, 542struct strbuf *gitdir); 543externconst char*setup_git_directory_gently(int*); 544externconst char*setup_git_directory(void); 545externchar*prefix_path(const char*prefix,int len,const char*path); 546externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 547 548/* 549 * Concatenate "prefix" (if len is non-zero) and "path", with no 550 * connecting characters (so "prefix" should end with a "/"). 551 * Unlike prefix_path, this should be used if the named file does 552 * not have to interact with index entry; i.e. name of a random file 553 * on the filesystem. 554 * 555 * The return value is always a newly allocated string (even if the 556 * prefix was empty). 557 */ 558externchar*prefix_filename(const char*prefix,const char*path); 559 560externintcheck_filename(const char*prefix,const char*name); 561externvoidverify_filename(const char*prefix, 562const char*name, 563int diagnose_misspelt_rev); 564externvoidverify_non_filename(const char*prefix,const char*name); 565externintpath_inside_repo(const char*prefix,const char*path); 566 567#define INIT_DB_QUIET 0x0001 568#define INIT_DB_EXIST_OK 0x0002 569 570externintinit_db(const char*git_dir,const char*real_git_dir, 571const char*template_dir,unsigned int flags); 572 573externvoidsanitize_stdfds(void); 574externintdaemonize(void); 575 576#define alloc_nr(x) (((x)+16)*3/2) 577 578/* 579 * Realloc the buffer pointed at by variable 'x' so that it can hold 580 * at least 'nr' entries; the number of entries currently allocated 581 * is 'alloc', using the standard growing factor alloc_nr() macro. 582 * 583 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 584 */ 585#define ALLOC_GROW(x, nr, alloc) \ 586 do { \ 587 if ((nr) > alloc) { \ 588 if (alloc_nr(alloc) < (nr)) \ 589 alloc = (nr); \ 590 else \ 591 alloc = alloc_nr(alloc); \ 592 REALLOC_ARRAY(x, alloc); \ 593 } \ 594 } while (0) 595 596/* Initialize and use the cache information */ 597struct lock_file; 598externintread_index(struct index_state *); 599externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 600externintdo_read_index(struct index_state *istate,const char*path, 601int must_exist);/* for testting only! */ 602externintread_index_from(struct index_state *,const char*path, 603const char*gitdir); 604externintis_index_unborn(struct index_state *); 605externintread_index_unmerged(struct index_state *); 606#define COMMIT_LOCK (1 << 0) 607#define CLOSE_LOCK (1 << 1) 608externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 609externintdiscard_index(struct index_state *); 610externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 611externintunmerged_index(const struct index_state *); 612externintverify_path(const char*path); 613externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 614externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 615externvoidadjust_dirname_case(struct index_state *istate,char*name); 616externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 617 618/* 619 * Searches for an entry defined by name and namelen in the given index. 620 * If the return value is positive (including 0) it is the position of an 621 * exact match. If the return value is negative, the negated value minus 1 622 * is the position where the entry would be inserted. 623 * Example: The current index consists of these files and its stages: 624 * 625 * b#0, d#0, f#1, f#3 626 * 627 * index_name_pos(&index, "a", 1) -> -1 628 * index_name_pos(&index, "b", 1) -> 0 629 * index_name_pos(&index, "c", 1) -> -2 630 * index_name_pos(&index, "d", 1) -> 1 631 * index_name_pos(&index, "e", 1) -> -3 632 * index_name_pos(&index, "f", 1) -> -3 633 * index_name_pos(&index, "g", 1) -> -5 634 */ 635externintindex_name_pos(const struct index_state *,const char*name,int namelen); 636 637#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 638#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 639#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 640#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 641#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 642#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 643externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 644externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 645 646/* Remove entry, return true if there are more entries to go. */ 647externintremove_index_entry_at(struct index_state *,int pos); 648 649externvoidremove_marked_cache_entries(struct index_state *istate); 650externintremove_file_from_index(struct index_state *,const char*path); 651#define ADD_CACHE_VERBOSE 1 652#define ADD_CACHE_PRETEND 2 653#define ADD_CACHE_IGNORE_ERRORS 4 654#define ADD_CACHE_IGNORE_REMOVAL 8 655#define ADD_CACHE_INTENT 16 656/* 657 * These two are used to add the contents of the file at path 658 * to the index, marking the working tree up-to-date by storing 659 * the cached stat info in the resulting cache entry. A caller 660 * that has already run lstat(2) on the path can call 661 * add_to_index(), and all others can call add_file_to_index(); 662 * the latter will do necessary lstat(2) internally before 663 * calling the former. 664 */ 665externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 666externintadd_file_to_index(struct index_state *,const char*path,int flags); 667 668externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 669externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 670externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 671externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 672externintindex_name_is_other(const struct index_state *,const char*,int); 673externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 674 675/* do stat comparison even if CE_VALID is true */ 676#define CE_MATCH_IGNORE_VALID 01 677/* do not check the contents but report dirty on racily-clean entries */ 678#define CE_MATCH_RACY_IS_DIRTY 02 679/* do stat comparison even if CE_SKIP_WORKTREE is true */ 680#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 681/* ignore non-existent files during stat update */ 682#define CE_MATCH_IGNORE_MISSING 0x08 683/* enable stat refresh */ 684#define CE_MATCH_REFRESH 0x10 685externintie_match_stat(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 686externintie_modified(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 687 688#define HASH_WRITE_OBJECT 1 689#define HASH_FORMAT_CHECK 2 690externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 691externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 692 693/* 694 * Record to sd the data from st that we use to check whether a file 695 * might have changed. 696 */ 697externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 698 699/* 700 * Return 0 if st is consistent with a file not having been changed 701 * since sd was filled. If there are differences, return a 702 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 703 * INODE_CHANGED, and DATA_CHANGED. 704 */ 705externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 706externintmatch_stat_data_racy(const struct index_state *istate, 707const struct stat_data *sd,struct stat *st); 708 709externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 710 711#define REFRESH_REALLY 0x0001/* ignore_valid */ 712#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 713#define REFRESH_QUIET 0x0004/* be quiet about it */ 714#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 715#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 716#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 717externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 718externstruct cache_entry *refresh_cache_entry(struct cache_entry *,unsigned int); 719 720externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 721 722externinthold_locked_index(struct lock_file *,int); 723externvoidset_alternate_index_output(const char*); 724 725externint verify_index_checksum; 726 727/* Environment bits from configuration mechanism */ 728externint trust_executable_bit; 729externint trust_ctime; 730externint check_stat; 731externint quote_path_fully; 732externint has_symlinks; 733externint minimum_abbrev, default_abbrev; 734externint ignore_case; 735externint assume_unchanged; 736externint prefer_symlink_refs; 737externint warn_ambiguous_refs; 738externint warn_on_object_refname_ambiguity; 739externconst char*apply_default_whitespace; 740externconst char*apply_default_ignorewhitespace; 741externconst char*git_attributes_file; 742externconst char*git_hooks_path; 743externint zlib_compression_level; 744externint core_compression_level; 745externint pack_compression_level; 746externsize_t packed_git_window_size; 747externsize_t packed_git_limit; 748externsize_t delta_base_cache_limit; 749externunsigned long big_file_threshold; 750externunsigned long pack_size_limit_cfg; 751 752/* 753 * Accessors for the core.sharedrepository config which lazy-load the value 754 * from the config (if not already set). The "reset" function can be 755 * used to unset "set" or cached value, meaning that the value will be loaded 756 * fresh from the config file on the next call to get_shared_repository(). 757 */ 758voidset_shared_repository(int value); 759intget_shared_repository(void); 760voidreset_shared_repository(void); 761 762/* 763 * Do replace refs need to be checked this run? This variable is 764 * initialized to true unless --no-replace-object is used or 765 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 766 * commands that do not want replace references to be active. As an 767 * optimization it is also set to false if replace references have 768 * been sought but there were none. 769 */ 770externint check_replace_refs; 771externchar*git_replace_ref_base; 772 773externint fsync_object_files; 774externint core_preload_index; 775externint core_apply_sparse_checkout; 776externint precomposed_unicode; 777externint protect_hfs; 778externint protect_ntfs; 779 780/* 781 * Include broken refs in all ref iterations, which will 782 * generally choke dangerous operations rather than letting 783 * them silently proceed without taking the broken ref into 784 * account. 785 */ 786externint ref_paranoia; 787 788/* 789 * Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value). 790 */ 791intuse_optional_locks(void); 792 793/* 794 * The character that begins a commented line in user-editable file 795 * that is subject to stripspace. 796 */ 797externchar comment_line_char; 798externint auto_comment_line_char; 799 800/* Windows only */ 801enum hide_dotfiles_type { 802 HIDE_DOTFILES_FALSE =0, 803 HIDE_DOTFILES_TRUE, 804 HIDE_DOTFILES_DOTGITONLY 805}; 806externenum hide_dotfiles_type hide_dotfiles; 807 808enum log_refs_config { 809 LOG_REFS_UNSET = -1, 810 LOG_REFS_NONE =0, 811 LOG_REFS_NORMAL, 812 LOG_REFS_ALWAYS 813}; 814externenum log_refs_config log_all_ref_updates; 815 816enum branch_track { 817 BRANCH_TRACK_UNSPECIFIED = -1, 818 BRANCH_TRACK_NEVER =0, 819 BRANCH_TRACK_REMOTE, 820 BRANCH_TRACK_ALWAYS, 821 BRANCH_TRACK_EXPLICIT, 822 BRANCH_TRACK_OVERRIDE 823}; 824 825enum rebase_setup_type { 826 AUTOREBASE_NEVER =0, 827 AUTOREBASE_LOCAL, 828 AUTOREBASE_REMOTE, 829 AUTOREBASE_ALWAYS 830}; 831 832enum push_default_type { 833 PUSH_DEFAULT_NOTHING =0, 834 PUSH_DEFAULT_MATCHING, 835 PUSH_DEFAULT_SIMPLE, 836 PUSH_DEFAULT_UPSTREAM, 837 PUSH_DEFAULT_CURRENT, 838 PUSH_DEFAULT_UNSPECIFIED 839}; 840 841externenum branch_track git_branch_track; 842externenum rebase_setup_type autorebase; 843externenum push_default_type push_default; 844 845enum object_creation_mode { 846 OBJECT_CREATION_USES_HARDLINKS =0, 847 OBJECT_CREATION_USES_RENAMES =1 848}; 849 850externenum object_creation_mode object_creation_mode; 851 852externchar*notes_ref_name; 853 854externint grafts_replace_parents; 855 856/* 857 * GIT_REPO_VERSION is the version we write by default. The 858 * _READ variant is the highest number we know how to 859 * handle. 860 */ 861#define GIT_REPO_VERSION 0 862#define GIT_REPO_VERSION_READ 1 863externint repository_format_precious_objects; 864 865struct repository_format { 866int version; 867int precious_objects; 868int is_bare; 869char*work_tree; 870struct string_list unknown_extensions; 871}; 872 873/* 874 * Read the repository format characteristics from the config file "path" into 875 * "format" struct. Returns the numeric version. On error, -1 is returned, 876 * format->version is set to -1, and all other fields in the struct are 877 * undefined. 878 */ 879intread_repository_format(struct repository_format *format,const char*path); 880 881/* 882 * Verify that the repository described by repository_format is something we 883 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 884 * any errors encountered. 885 */ 886intverify_repository_format(const struct repository_format *format, 887struct strbuf *err); 888 889/* 890 * Check the repository format version in the path found in get_git_dir(), 891 * and die if it is a version we don't understand. Generally one would 892 * set_git_dir() before calling this, and use it only for "are we in a valid 893 * repo?". 894 */ 895externvoidcheck_repository_format(void); 896 897#define MTIME_CHANGED 0x0001 898#define CTIME_CHANGED 0x0002 899#define OWNER_CHANGED 0x0004 900#define MODE_CHANGED 0x0008 901#define INODE_CHANGED 0x0010 902#define DATA_CHANGED 0x0020 903#define TYPE_CHANGED 0x0040 904 905/* 906 * Return the name of the file in the local object database that would 907 * be used to store a loose object with the specified sha1. The 908 * return value is a pointer to a statically allocated buffer that is 909 * overwritten each time the function is called. 910 */ 911externconst char*sha1_file_name(const unsigned char*sha1); 912 913/* 914 * Return an abbreviated sha1 unique within this repository's object database. 915 * The result will be at least `len` characters long, and will be NUL 916 * terminated. 917 * 918 * The non-`_r` version returns a static buffer which remains valid until 4 919 * more calls to find_unique_abbrev are made. 920 * 921 * The `_r` variant writes to a buffer supplied by the caller, which must be at 922 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes 923 * written (excluding the NUL terminator). 924 * 925 * Note that while this version avoids the static buffer, it is not fully 926 * reentrant, as it calls into other non-reentrant git code. 927 */ 928externconst char*find_unique_abbrev(const unsigned char*sha1,int len); 929externintfind_unique_abbrev_r(char*hex,const unsigned char*sha1,int len); 930 931externconst unsigned char null_sha1[GIT_MAX_RAWSZ]; 932externconst struct object_id null_oid; 933 934staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 935{ 936returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ); 937} 938 939staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 940{ 941returnhashcmp(oid1->hash, oid2->hash); 942} 943 944staticinlineintis_null_sha1(const unsigned char*sha1) 945{ 946return!hashcmp(sha1, null_sha1); 947} 948 949staticinlineintis_null_oid(const struct object_id *oid) 950{ 951return!hashcmp(oid->hash, null_sha1); 952} 953 954staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 955{ 956memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 957} 958 959staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 960{ 961hashcpy(dst->hash, src->hash); 962} 963 964staticinlinestruct object_id *oiddup(const struct object_id *src) 965{ 966struct object_id *dst =xmalloc(sizeof(struct object_id)); 967oidcpy(dst, src); 968return dst; 969} 970 971staticinlinevoidhashclr(unsigned char*hash) 972{ 973memset(hash,0, GIT_SHA1_RAWSZ); 974} 975 976staticinlinevoidoidclr(struct object_id *oid) 977{ 978hashclr(oid->hash); 979} 980 981 982#define EMPTY_TREE_SHA1_HEX \ 983"4b825dc642cb6eb9a060e54bf8d69288fbee4904" 984#define EMPTY_TREE_SHA1_BIN_LITERAL \ 985"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ 986"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" 987externconst struct object_id empty_tree_oid; 988#define EMPTY_TREE_SHA1_BIN (empty_tree_oid.hash) 989 990#define EMPTY_BLOB_SHA1_HEX \ 991"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" 992#define EMPTY_BLOB_SHA1_BIN_LITERAL \ 993"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ 994"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" 995externconst struct object_id empty_blob_oid; 996#define EMPTY_BLOB_SHA1_BIN (empty_blob_oid.hash) 997 998 999staticinlineintis_empty_blob_sha1(const unsigned char*sha1)1000{1001return!hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);1002}10031004staticinlineintis_empty_blob_oid(const struct object_id *oid)1005{1006return!hashcmp(oid->hash, EMPTY_BLOB_SHA1_BIN);1007}10081009staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1010{1011return!hashcmp(sha1, EMPTY_TREE_SHA1_BIN);1012}10131014staticinlineintis_empty_tree_oid(const struct object_id *oid)1015{1016return!hashcmp(oid->hash, EMPTY_TREE_SHA1_BIN);1017}10181019/* set default permissions by passing mode arguments to open(2) */1020intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1021intgit_mkstemp_mode(char*pattern,int mode);10221023/*1024 * NOTE NOTE NOTE!!1025 *1026 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1027 * not be changed. Old repositories have core.sharedrepository written in1028 * numeric format, and therefore these values are preserved for compatibility1029 * reasons.1030 */1031enum sharedrepo {1032 PERM_UMASK =0,1033 OLD_PERM_GROUP =1,1034 OLD_PERM_EVERYBODY =2,1035 PERM_GROUP =0660,1036 PERM_EVERYBODY =06641037};1038intgit_config_perm(const char*var,const char*value);1039intadjust_shared_perm(const char*path);10401041/*1042 * Create the directory containing the named path, using care to be1043 * somewhat safe against races. Return one of the scld_error values to1044 * indicate success/failure. On error, set errno to describe the1045 * problem.1046 *1047 * SCLD_VANISHED indicates that one of the ancestor directories of the1048 * path existed at one point during the function call and then1049 * suddenly vanished, probably because another process pruned the1050 * directory while we were working. To be robust against this kind of1051 * race, callers might want to try invoking the function again when it1052 * returns SCLD_VANISHED.1053 *1054 * safe_create_leading_directories() temporarily changes path while it1055 * is working but restores it before returning.1056 * safe_create_leading_directories_const() doesn't modify path, even1057 * temporarily.1058 */1059enum scld_error {1060 SCLD_OK =0,1061 SCLD_FAILED = -1,1062 SCLD_PERMS = -2,1063 SCLD_EXISTS = -3,1064 SCLD_VANISHED = -41065};1066enum scld_error safe_create_leading_directories(char*path);1067enum scld_error safe_create_leading_directories_const(const char*path);10681069/*1070 * Callback function for raceproof_create_file(). This function is1071 * expected to do something that makes dirname(path) permanent despite1072 * the fact that other processes might be cleaning up empty1073 * directories at the same time. Usually it will create a file named1074 * path, but alternatively it could create another file in that1075 * directory, or even chdir() into that directory. The function should1076 * return 0 if the action was completed successfully. On error, it1077 * should return a nonzero result and set errno.1078 * raceproof_create_file() treats two errno values specially:1079 *1080 * - ENOENT -- dirname(path) does not exist. In this case,1081 * raceproof_create_file() tries creating dirname(path)1082 * (and any parent directories, if necessary) and calls1083 * the function again.1084 *1085 * - EISDIR -- the file already exists and is a directory. In this1086 * case, raceproof_create_file() removes the directory if1087 * it is empty (and recursively any empty directories that1088 * it contains) and calls the function again.1089 *1090 * Any other errno causes raceproof_create_file() to fail with the1091 * callback's return value and errno.1092 *1093 * Obviously, this function should be OK with being called again if it1094 * fails with ENOENT or EISDIR. In other scenarios it will not be1095 * called again.1096 */1097typedefintcreate_file_fn(const char*path,void*cb);10981099/*1100 * Create a file in dirname(path) by calling fn, creating leading1101 * directories if necessary. Retry a few times in case we are racing1102 * with another process that is trying to clean up the directory that1103 * contains path. See the documentation for create_file_fn for more1104 * details.1105 *1106 * Return the value and set the errno that resulted from the most1107 * recent call of fn. fn is always called at least once, and will be1108 * called more than once if it returns ENOENT or EISDIR.1109 */1110intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11111112intmkdir_in_gitdir(const char*path);1113externchar*expand_user_path(const char*path,int real_home);1114const char*enter_repo(const char*path,int strict);1115staticinlineintis_absolute_path(const char*path)1116{1117returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1118}1119intis_directory(const char*);1120char*strbuf_realpath(struct strbuf *resolved,const char*path,1121int die_on_error);1122const char*real_path(const char*path);1123const char*real_path_if_valid(const char*path);1124char*real_pathdup(const char*path,int die_on_error);1125const char*absolute_path(const char*path);1126char*absolute_pathdup(const char*path);1127const char*remove_leading_path(const char*in,const char*prefix);1128const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1129intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1130intnormalize_path_copy(char*dst,const char*src);1131intlongest_ancestor_length(const char*path,struct string_list *prefixes);1132char*strip_path_suffix(const char*path,const char*suffix);1133intdaemon_avoid_alias(const char*path);1134externintis_ntfs_dotgit(const char*name);11351136/*1137 * Returns true iff "str" could be confused as a command-line option when1138 * passed to a sub-program like "ssh". Note that this has nothing to do with1139 * shell-quoting, which should be handled separately; we're assuming here that1140 * the string makes it verbatim to the sub-program.1141 */1142intlooks_like_command_line_option(const char*str);11431144/**1145 * Return a newly allocated string with the evaluation of1146 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1147 * "$HOME/.config/git/$filename". Return NULL upon error.1148 */1149externchar*xdg_config_home(const char*filename);11501151/**1152 * Return a newly allocated string with the evaluation of1153 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1154 * "$HOME/.cache/git/$filename". Return NULL upon error.1155 */1156externchar*xdg_cache_home(const char*filename);11571158externvoid*read_sha1_file_extended(const unsigned char*sha1,1159enum object_type *type,1160unsigned long*size,int lookup_replace);1161staticinlinevoid*read_sha1_file(const unsigned char*sha1,enum object_type *type,unsigned long*size)1162{1163returnread_sha1_file_extended(sha1, type, size,1);1164}11651166/*1167 * This internal function is only declared here for the benefit of1168 * lookup_replace_object(). Please do not call it directly.1169 */1170externconst unsigned char*do_lookup_replace_object(const unsigned char*sha1);11711172/*1173 * If object sha1 should be replaced, return the replacement object's1174 * name (replaced recursively, if necessary). The return value is1175 * either sha1 or a pointer to a permanently-allocated value. When1176 * object replacement is suppressed, always return sha1.1177 */1178staticinlineconst unsigned char*lookup_replace_object(const unsigned char*sha1)1179{1180if(!check_replace_refs)1181return sha1;1182returndo_lookup_replace_object(sha1);1183}11841185/* Read and unpack a sha1 file into memory, write memory to a sha1 file */1186externintsha1_object_info(const unsigned char*,unsigned long*);1187externinthash_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*sha1);1188externintwrite_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*return_sha1);1189externinthash_sha1_file_literally(const void*buf,unsigned long len,const char*type,struct object_id *oid,unsigned flags);1190externintpretend_sha1_file(void*,unsigned long,enum object_type,unsigned char*);1191externintforce_object_loose(const unsigned char*sha1,time_t mtime);1192externintgit_open_cloexec(const char*name,int flags);1193#define git_open(name) git_open_cloexec(name, O_RDONLY)1194externvoid*map_sha1_file(const unsigned char*sha1,unsigned long*size);1195externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1196externintparse_sha1_header(const char*hdr,unsigned long*sizep);11971198externintcheck_sha1_signature(const unsigned char*sha1,void*buf,unsigned long size,const char*type);11991200externintfinalize_object_file(const char*tmpfile,const char*filename);12011202/*1203 * Open the loose object at path, check its sha1, and return the contents,1204 * type, and size. If the object is a blob, then "contents" may return NULL,1205 * to allow streaming of large blobs.1206 *1207 * Returns 0 on success, negative on error (details may be written to stderr).1208 */1209intread_loose_object(const char*path,1210const unsigned char*expected_sha1,1211enum object_type *type,1212unsigned long*size,1213void**contents);12141215/*1216 * Convenience for sha1_object_info_extended() with a NULL struct1217 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1218 * nonzero flags to also set other flags.1219 */1220externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1221staticinlineinthas_sha1_file(const unsigned char*sha1)1222{1223returnhas_sha1_file_with_flags(sha1,0);1224}12251226/* Same as the above, except for struct object_id. */1227externinthas_object_file(const struct object_id *oid);1228externinthas_object_file_with_flags(const struct object_id *oid,int flags);12291230/*1231 * Return true iff an alternate object database has a loose object1232 * with the specified name. This function does not respect replace1233 * references.1234 */1235externinthas_loose_object_nonlocal(const unsigned char*sha1);12361237externvoidassert_sha1_type(const unsigned char*sha1,enum object_type expect);12381239/* Helper to check and "touch" a file */1240externintcheck_and_freshen_file(const char*fn,int freshen);12411242externconst signed char hexval_table[256];1243staticinlineunsigned inthexval(unsigned char c)1244{1245return hexval_table[c];1246}12471248/*1249 * Convert two consecutive hexadecimal digits into a char. Return a1250 * negative value on error. Don't run over the end of short strings.1251 */1252staticinlineinthex2chr(const char*s)1253{1254unsigned int val =hexval(s[0]);1255return(val & ~0xf) ? val : (val <<4) |hexval(s[1]);1256}12571258/* Convert to/from hex/sha1 representation */1259#define MINIMUM_ABBREV minimum_abbrev1260#define DEFAULT_ABBREV default_abbrev12611262/* used when the code does not know or care what the default abbrev is */1263#define FALLBACK_DEFAULT_ABBREV 712641265struct object_context {1266unsigned char tree[20];1267unsigned mode;1268/*1269 * symlink_path is only used by get_tree_entry_follow_symlinks,1270 * and only for symlinks that point outside the repository.1271 */1272struct strbuf symlink_path;1273/*1274 * If GET_OID_RECORD_PATH is set, this will record path (if any)1275 * found when resolving the name. The caller is responsible for1276 * releasing the memory.1277 */1278char*path;1279};12801281#define GET_OID_QUIETLY 011282#define GET_OID_COMMIT 021283#define GET_OID_COMMITTISH 041284#define GET_OID_TREE 0101285#define GET_OID_TREEISH 0201286#define GET_OID_BLOB 0401287#define GET_OID_FOLLOW_SYMLINKS 01001288#define GET_OID_RECORD_PATH 02001289#define GET_OID_ONLY_TO_DIE 0400012901291#define GET_OID_DISAMBIGUATORS \1292 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1293 GET_OID_TREE | GET_OID_TREEISH | \1294 GET_OID_BLOB)12951296externintget_oid(const char*str,struct object_id *oid);1297externintget_oid_commit(const char*str,struct object_id *oid);1298externintget_oid_committish(const char*str,struct object_id *oid);1299externintget_oid_tree(const char*str,struct object_id *oid);1300externintget_oid_treeish(const char*str,struct object_id *oid);1301externintget_oid_blob(const char*str,struct object_id *oid);1302externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1303externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);130413051306typedefinteach_abbrev_fn(const struct object_id *oid,void*);1307externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13081309externintset_disambiguate_hint_config(const char*var,const char*value);13101311/*1312 * Try to read a SHA1 in hexadecimal format from the 40 characters1313 * starting at hex. Write the 20-byte result to sha1 in binary form.1314 * Return 0 on success. Reading stops if a NUL is encountered in the1315 * input, so it is safe to pass this function an arbitrary1316 * null-terminated string.1317 */1318externintget_sha1_hex(const char*hex,unsigned char*sha1);1319externintget_oid_hex(const char*hex,struct object_id *sha1);13201321/*1322 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1323 * and writes the NUL-terminated output to the buffer `out`, which must be at1324 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1325 * convenience.1326 *1327 * The non-`_r` variant returns a static buffer, but uses a ring of 41328 * buffers, making it safe to make multiple calls for a single statement, like:1329 *1330 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1331 */1332externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1333externchar*oid_to_hex_r(char*out,const struct object_id *oid);1334externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1335externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */13361337/*1338 * Parse a 40-character hexadecimal object ID starting from hex, updating the1339 * pointer specified by end when parsing stops. The resulting object ID is1340 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1341 * other invalid character. end is only updated on success; otherwise, it is1342 * unmodified.1343 */1344externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);13451346/*1347 * This reads short-hand syntax that not only evaluates to a commit1348 * object name, but also can act as if the end user spelled the name1349 * of the branch from the command line.1350 *1351 * - "@{-N}" finds the name of the Nth previous branch we were on, and1352 * places the name of the branch in the given buf and returns the1353 * number of characters parsed if successful.1354 *1355 * - "<branch>@{upstream}" finds the name of the other ref that1356 * <branch> is configured to merge with (missing <branch> defaults1357 * to the current branch), and places the name of the branch in the1358 * given buf and returns the number of characters parsed if1359 * successful.1360 *1361 * If the input is not of the accepted format, it returns a negative1362 * number to signal an error.1363 *1364 * If the input was ok but there are not N branch switches in the1365 * reflog, it returns 0.1366 *1367 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1368 * expansions: local branches ("refs/heads/"), remote branches1369 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1370 * allowed, even ones to refs outside of those namespaces.1371 */1372#define INTERPRET_BRANCH_LOCAL (1<<0)1373#define INTERPRET_BRANCH_REMOTE (1<<1)1374#define INTERPRET_BRANCH_HEAD (1<<2)1375externintinterpret_branch_name(const char*str,int len,struct strbuf *,1376unsigned allowed);1377externintget_oid_mb(const char*str,struct object_id *oid);13781379externintvalidate_headref(const char*ref);13801381externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1382externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1383externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1384externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);13851386externvoid*read_object_with_reference(const unsigned char*sha1,1387const char*required_type,1388unsigned long*size,1389unsigned char*sha1_ret);13901391externstruct object *peel_to_type(const char*name,int namelen,1392struct object *o,enum object_type);13931394struct date_mode {1395enum date_mode_type {1396 DATE_NORMAL =0,1397 DATE_RELATIVE,1398 DATE_SHORT,1399 DATE_ISO8601,1400 DATE_ISO8601_STRICT,1401 DATE_RFC2822,1402 DATE_STRFTIME,1403 DATE_RAW,1404 DATE_UNIX1405} type;1406const char*strftime_fmt;1407int local;1408};14091410/*1411 * Convenience helper for passing a constant type, like:1412 *1413 * show_date(t, tz, DATE_MODE(NORMAL));1414 */1415#define DATE_MODE(t) date_mode_from_type(DATE_##t)1416struct date_mode *date_mode_from_type(enum date_mode_type type);14171418const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1419voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1420struct strbuf *timebuf);1421intparse_date(const char*date,struct strbuf *out);1422intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1423intparse_expiry_date(const char*date, timestamp_t *timestamp);1424voiddatestamp(struct strbuf *out);1425#define approxidate(s) approxidate_careful((s), NULL)1426timestamp_t approxidate_careful(const char*,int*);1427timestamp_t approxidate_relative(const char*date,const struct timeval *now);1428voidparse_date_format(const char*format,struct date_mode *mode);1429intdate_overflows(timestamp_t date);14301431#define IDENT_STRICT 11432#define IDENT_NO_DATE 21433#define IDENT_NO_NAME 41434externconst char*git_author_info(int);1435externconst char*git_committer_info(int);1436externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1437externconst char*fmt_name(const char*name,const char*email);1438externconst char*ident_default_name(void);1439externconst char*ident_default_email(void);1440externconst char*git_editor(void);1441externconst char*git_pager(int stdout_is_tty);1442externintgit_ident_config(const char*,const char*,void*);1443externvoidreset_ident_date(void);14441445struct ident_split {1446const char*name_begin;1447const char*name_end;1448const char*mail_begin;1449const char*mail_end;1450const char*date_begin;1451const char*date_end;1452const char*tz_begin;1453const char*tz_end;1454};1455/*1456 * Signals an success with 0, but time part of the result may be NULL1457 * if the input lacks timestamp and zone1458 */1459externintsplit_ident_line(struct ident_split *,const char*,int);14601461/*1462 * Like show_date, but pull the timestamp and tz parameters from1463 * the ident_split. It will also sanity-check the values and produce1464 * a well-known sentinel date if they appear bogus.1465 */1466const char*show_ident_date(const struct ident_split *id,1467const struct date_mode *mode);14681469/*1470 * Compare split idents for equality or strict ordering. Note that we1471 * compare only the ident part of the line, ignoring any timestamp.1472 *1473 * Because there are two fields, we must choose one as the primary key; we1474 * currently arbitrarily pick the email.1475 */1476externintident_cmp(const struct ident_split *,const struct ident_split *);14771478struct checkout {1479struct index_state *istate;1480const char*base_dir;1481int base_dir_len;1482struct delayed_checkout *delayed_checkout;1483unsigned force:1,1484 quiet:1,1485 not_new:1,1486 refresh_cache:1;1487};1488#define CHECKOUT_INIT { NULL,"" }14891490#define TEMPORARY_FILENAME_LENGTH 251491externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1492externvoidenable_delayed_checkout(struct checkout *state);1493externintfinish_delayed_checkout(struct checkout *state);14941495struct cache_def {1496struct strbuf path;1497int flags;1498int track_flags;1499int prefix_len_stat_func;1500};1501#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1502staticinlinevoidcache_def_clear(struct cache_def *cache)1503{1504strbuf_release(&cache->path);1505}15061507externinthas_symlink_leading_path(const char*name,int len);1508externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1509externintcheck_leading_path(const char*name,int len);1510externinthas_dirs_only_path(const char*name,int len,int prefix_len);1511externvoidschedule_dir_for_removal(const char*name,int len);1512externvoidremove_scheduled_dirs(void);15131514externstruct alternate_object_database {1515struct alternate_object_database *next;15161517/* see alt_scratch_buf() */1518struct strbuf scratch;1519size_t base_len;15201521/*1522 * Used to store the results of readdir(3) calls when searching1523 * for unique abbreviated hashes. This cache is never1524 * invalidated, thus it's racy and not necessarily accurate.1525 * That's fine for its purpose; don't use it for tasks requiring1526 * greater accuracy!1527 */1528char loose_objects_subdir_seen[256];1529struct oid_array loose_objects_cache;15301531char path[FLEX_ARRAY];1532} *alt_odb_list;1533externvoidprepare_alt_odb(void);1534externchar*compute_alternate_path(const char*path,struct strbuf *err);1535typedefintalt_odb_fn(struct alternate_object_database *,void*);1536externintforeach_alt_odb(alt_odb_fn,void*);15371538/*1539 * Allocate a "struct alternate_object_database" but do _not_ actually1540 * add it to the list of alternates.1541 */1542struct alternate_object_database *alloc_alt_odb(const char*dir);15431544/*1545 * Add the directory to the on-disk alternates file; the new entry will also1546 * take effect in the current process.1547 */1548externvoidadd_to_alternates_file(const char*dir);15491550/*1551 * Add the directory to the in-memory list of alternates (along with any1552 * recursive alternates it points to), but do not modify the on-disk alternates1553 * file.1554 */1555externvoidadd_to_alternates_memory(const char*dir);15561557/*1558 * Returns a scratch strbuf pre-filled with the alternate object directory,1559 * including a trailing slash, which can be used to access paths in the1560 * alternate. Always use this over direct access to alt->scratch, as it1561 * cleans up any previous use of the scratch buffer.1562 */1563externstruct strbuf *alt_scratch_buf(struct alternate_object_database *alt);15641565struct pack_window {1566struct pack_window *next;1567unsigned char*base;1568 off_t offset;1569size_t len;1570unsigned int last_used;1571unsigned int inuse_cnt;1572};15731574externstruct packed_git {1575struct packed_git *next;1576struct pack_window *windows;1577 off_t pack_size;1578const void*index_data;1579size_t index_size;1580uint32_t num_objects;1581uint32_t num_bad_objects;1582unsigned char*bad_object_sha1;1583int index_version;1584time_t mtime;1585int pack_fd;1586unsigned pack_local:1,1587 pack_keep:1,1588 freshened:1,1589 do_not_close:1;1590unsigned char sha1[20];1591struct revindex_entry *revindex;1592/* something like ".git/objects/pack/xxxxx.pack" */1593char pack_name[FLEX_ARRAY];/* more */1594} *packed_git;15951596/*1597 * A most-recently-used ordered version of the packed_git list, which can1598 * be iterated instead of packed_git (and marked via mru_mark).1599 */1600externstruct mru packed_git_mru;16011602struct pack_entry {1603 off_t offset;1604unsigned char sha1[20];1605struct packed_git *p;1606};16071608/*1609 * Create a temporary file rooted in the object database directory, or1610 * die on failure. The filename is taken from "pattern", which should have the1611 * usual "XXXXXX" trailer, and the resulting filename is written into the1612 * "template" buffer. Returns the open descriptor.1613 */1614externintodb_mkstemp(struct strbuf *template,const char*pattern);16151616/*1617 * Create a pack .keep file named "name" (which should generally be the output1618 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1619 * error.1620 */1621externintodb_pack_keep(const char*name);16221623/*1624 * Iterate over the files in the loose-object parts of the object1625 * directory "path", triggering the following callbacks:1626 *1627 * - loose_object is called for each loose object we find.1628 *1629 * - loose_cruft is called for any files that do not appear to be1630 * loose objects. Note that we only look in the loose object1631 * directories "objects/[0-9a-f]{2}/", so we will not report1632 * "objects/foobar" as cruft.1633 *1634 * - loose_subdir is called for each top-level hashed subdirectory1635 * of the object directory (e.g., "$OBJDIR/f0"). It is called1636 * after the objects in the directory are processed.1637 *1638 * Any callback that is NULL will be ignored. Callbacks returning non-zero1639 * will end the iteration.1640 *1641 * In the "buf" variant, "path" is a strbuf which will also be used as a1642 * scratch buffer, but restored to its original contents before1643 * the function returns.1644 */1645typedefinteach_loose_object_fn(const struct object_id *oid,1646const char*path,1647void*data);1648typedefinteach_loose_cruft_fn(const char*basename,1649const char*path,1650void*data);1651typedefinteach_loose_subdir_fn(unsigned int nr,1652const char*path,1653void*data);1654intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1655struct strbuf *path,1656 each_loose_object_fn obj_cb,1657 each_loose_cruft_fn cruft_cb,1658 each_loose_subdir_fn subdir_cb,1659void*data);1660intfor_each_loose_file_in_objdir(const char*path,1661 each_loose_object_fn obj_cb,1662 each_loose_cruft_fn cruft_cb,1663 each_loose_subdir_fn subdir_cb,1664void*data);1665intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1666 each_loose_object_fn obj_cb,1667 each_loose_cruft_fn cruft_cb,1668 each_loose_subdir_fn subdir_cb,1669void*data);16701671/*1672 * Iterate over loose objects in both the local1673 * repository and any alternates repositories (unless the1674 * LOCAL_ONLY flag is set).1675 */1676#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11677externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);16781679struct object_info {1680/* Request */1681enum object_type *typep;1682unsigned long*sizep;1683 off_t *disk_sizep;1684unsigned char*delta_base_sha1;1685struct strbuf *typename;1686void**contentp;16871688/* Response */1689enum{1690 OI_CACHED,1691 OI_LOOSE,1692 OI_PACKED,1693 OI_DBCACHED1694} whence;1695union{1696/*1697 * struct {1698 * ... Nothing to expose in this case1699 * } cached;1700 * struct {1701 * ... Nothing to expose in this case1702 * } loose;1703 */1704struct{1705struct packed_git *pack;1706 off_t offset;1707unsigned int is_delta;1708} packed;1709} u;1710};17111712/*1713 * Initializer for a "struct object_info" that wants no items. You may1714 * also memset() the memory to all-zeroes.1715 */1716#define OBJECT_INFO_INIT {NULL}17171718/* Invoke lookup_replace_object() on the given hash */1719#define OBJECT_INFO_LOOKUP_REPLACE 11720/* Allow reading from a loose object file of unknown/bogus type */1721#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21722/* Do not check cached storage */1723#define OBJECT_INFO_SKIP_CACHED 41724/* Do not retry packed storage after checking packed and loose storage */1725#define OBJECT_INFO_QUICK 81726externintsha1_object_info_extended(const unsigned char*,struct object_info *,unsigned flags);17271728/* Dumb servers support */1729externintupdate_server_info(int);17301731externconst char*get_log_output_encoding(void);1732externconst char*get_commit_output_encoding(void);17331734/*1735 * This is a hack for test programs like test-dump-untracked-cache to1736 * ensure that they do not modify the untracked cache when reading it.1737 * Do not use it otherwise!1738 */1739externint ignore_untracked_cache_config;17401741externintcommitter_ident_sufficiently_given(void);1742externintauthor_ident_sufficiently_given(void);17431744externconst char*git_commit_encoding;1745externconst char*git_log_output_encoding;1746externconst char*git_mailmap_file;1747externconst char*git_mailmap_blob;17481749/* IO helper functions */1750externvoidmaybe_flush_or_die(FILE*,const char*);1751__attribute__((format(printf,2,3)))1752externvoidfprintf_or_die(FILE*,const char*fmt, ...);17531754#define COPY_READ_ERROR (-2)1755#define COPY_WRITE_ERROR (-3)1756externintcopy_fd(int ifd,int ofd);1757externintcopy_file(const char*dst,const char*src,int mode);1758externintcopy_file_with_time(const char*dst,const char*src,int mode);17591760externvoidwrite_or_die(int fd,const void*buf,size_t count);1761externvoidfsync_or_die(int fd,const char*);17621763extern ssize_t read_in_full(int fd,void*buf,size_t count);1764extern ssize_t write_in_full(int fd,const void*buf,size_t count);1765extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17661767staticinline ssize_t write_str_in_full(int fd,const char*str)1768{1769returnwrite_in_full(fd, str,strlen(str));1770}17711772/**1773 * Open (and truncate) the file at path, write the contents of buf to it,1774 * and close it. Dies if any errors are encountered.1775 */1776externvoidwrite_file_buf(const char*path,const char*buf,size_t len);17771778/**1779 * Like write_file_buf(), but format the contents into a buffer first.1780 * Additionally, write_file() will append a newline if one is not already1781 * present, making it convenient to write text files:1782 *1783 * write_file(path, "counter: %d", ctr);1784 */1785__attribute__((format(printf,2,3)))1786externvoidwrite_file(const char*path,const char*fmt, ...);17871788/* pager.c */1789externvoidsetup_pager(void);1790externintpager_in_use(void);1791externint pager_use_color;1792externintterm_columns(void);1793externintdecimal_width(uintmax_t);1794externintcheck_pager_config(const char*cmd);1795externvoidprepare_pager_args(struct child_process *,const char*pager);17961797externconst char*editor_program;1798externconst char*askpass_program;1799externconst char*excludes_file;18001801/* base85 */1802intdecode_85(char*dst,const char*line,int linelen);1803voidencode_85(char*buf,const unsigned char*data,int bytes);18041805/* alloc.c */1806externvoid*alloc_blob_node(void);1807externvoid*alloc_tree_node(void);1808externvoid*alloc_commit_node(void);1809externvoid*alloc_tag_node(void);1810externvoid*alloc_object_node(void);1811externvoidalloc_report(void);1812externunsigned intalloc_commit_index(void);18131814/* pkt-line.c */1815voidpacket_trace_identity(const char*prog);18161817/* add */1818/*1819 * return 0 if success, 1 - if addition of a file failed and1820 * ADD_FILES_IGNORE_ERRORS was specified in flags1821 */1822intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);18231824/* diff.c */1825externint diff_auto_refresh_index;18261827/* match-trees.c */1828voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1829voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);18301831/*1832 * whitespace rules.1833 * used by both diff and apply1834 * last two digits are tab width1835 */1836#define WS_BLANK_AT_EOL 01001837#define WS_SPACE_BEFORE_TAB 02001838#define WS_INDENT_WITH_NON_TAB 04001839#define WS_CR_AT_EOL 010001840#define WS_BLANK_AT_EOF 020001841#define WS_TAB_IN_INDENT 040001842#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1843#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1844#define WS_TAB_WIDTH_MASK 0771845/* All WS_* -- when extended, adapt diff.c emit_symbol */1846#define WS_RULE_MASK 077771847externunsigned whitespace_rule_cfg;1848externunsignedwhitespace_rule(const char*);1849externunsignedparse_whitespace_rule(const char*);1850externunsignedws_check(const char*line,int len,unsigned ws_rule);1851externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1852externchar*whitespace_error_string(unsigned ws);1853externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1854externintws_blank_line(const char*line,int len,unsigned ws_rule);1855#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18561857/* ls-files */1858voidoverlay_tree_on_index(struct index_state *istate,1859const char*tree_name,const char*prefix);18601861char*alias_lookup(const char*alias);1862intsplit_cmdline(char*cmdline,const char***argv);1863/* Takes a negative value returned by split_cmdline */1864const char*split_cmdline_strerror(int cmdline_errno);18651866/* setup.c */1867struct startup_info {1868int have_repository;1869const char*prefix;1870};1871externstruct startup_info *startup_info;18721873/* merge.c */1874struct commit_list;1875inttry_merge_command(const char*strategy,size_t xopts_nr,1876const char**xopts,struct commit_list *common,1877const char*head_arg,struct commit_list *remotes);1878intcheckout_fast_forward(const struct object_id *from,1879const struct object_id *to,1880int overwrite_ignore);188118821883intsane_execvp(const char*file,char*const argv[]);18841885/*1886 * A struct to encapsulate the concept of whether a file has changed1887 * since we last checked it. This uses criteria similar to those used1888 * for the index.1889 */1890struct stat_validity {1891struct stat_data *sd;1892};18931894voidstat_validity_clear(struct stat_validity *sv);18951896/*1897 * Returns 1 if the path is a regular file (or a symlink to a regular1898 * file) and matches the saved stat_validity, 0 otherwise. A missing1899 * or inaccessible file is considered a match if the struct was just1900 * initialized, or if the previous update found an inaccessible file.1901 */1902intstat_validity_check(struct stat_validity *sv,const char*path);19031904/*1905 * Update the stat_validity from a file opened at descriptor fd. If1906 * the file is missing, inaccessible, or not a regular file, then1907 * future calls to stat_validity_check will match iff one of those1908 * conditions continues to be true.1909 */1910voidstat_validity_update(struct stat_validity *sv,int fd);19111912intversioncmp(const char*s1,const char*s2);1913voidsleep_millisec(int millisec);19141915/*1916 * Create a directory and (if share is nonzero) adjust its permissions1917 * according to the shared_repository setting. Only use this for1918 * directories under $GIT_DIR. Don't use it for working tree1919 * directories.1920 */1921voidsafe_create_dir(const char*dir,int share);19221923#endif/* CACHE_H */