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"list.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#include"repository.h" 18 19#include <zlib.h> 20typedefstruct git_zstream { 21 z_stream z; 22unsigned long avail_in; 23unsigned long avail_out; 24unsigned long total_in; 25unsigned long total_out; 26unsigned char*next_in; 27unsigned char*next_out; 28} git_zstream; 29 30voidgit_inflate_init(git_zstream *); 31voidgit_inflate_init_gzip_only(git_zstream *); 32voidgit_inflate_end(git_zstream *); 33intgit_inflate(git_zstream *,int flush); 34 35voidgit_deflate_init(git_zstream *,int level); 36voidgit_deflate_init_gzip(git_zstream *,int level); 37voidgit_deflate_init_raw(git_zstream *,int level); 38voidgit_deflate_end(git_zstream *); 39intgit_deflate_abort(git_zstream *); 40intgit_deflate_end_gently(git_zstream *); 41intgit_deflate(git_zstream *,int flush); 42unsigned longgit_deflate_bound(git_zstream *,unsigned long); 43 44/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 45#define GIT_SHA1_RAWSZ 20 46#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 47 48/* The length in byte and in hex digits of the largest possible hash value. */ 49#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ 50#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ 51 52struct object_id { 53unsigned char hash[GIT_MAX_RAWSZ]; 54}; 55 56#define the_hash_algo the_repository->hash_algo 57 58#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 59#define DTYPE(de) ((de)->d_type) 60#else 61#undef DT_UNKNOWN 62#undef DT_DIR 63#undef DT_REG 64#undef DT_LNK 65#define DT_UNKNOWN 0 66#define DT_DIR 1 67#define DT_REG 2 68#define DT_LNK 3 69#define DTYPE(de) DT_UNKNOWN 70#endif 71 72/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 73#define S_IFINVALID 0030000 74 75/* 76 * A "directory link" is a link to another git directory. 77 * 78 * The value 0160000 is not normally a valid mode, and 79 * also just happens to be S_IFDIR + S_IFLNK 80 */ 81#define S_IFGITLINK 0160000 82#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 83 84/* 85 * Some mode bits are also used internally for computations. 86 * 87 * They *must* not overlap with any valid modes, and they *must* not be emitted 88 * to outside world - i.e. appear on disk or network. In other words, it's just 89 * temporary fields, which we internally use, but they have to stay in-house. 90 * 91 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 92 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 93 */ 94 95/* used internally in tree-diff */ 96#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 97 98 99/* 100 * Intensive research over the course of many years has shown that 101 * port 9418 is totally unused by anything else. Or 102 * 103 * Your search - "port 9418" - did not match any documents. 104 * 105 * as www.google.com puts it. 106 * 107 * This port has been properly assigned for git use by IANA: 108 * git (Assigned-9418) [I06-050728-0001]. 109 * 110 * git 9418/tcp git pack transfer service 111 * git 9418/udp git pack transfer service 112 * 113 * with Linus Torvalds <torvalds@osdl.org> as the point of 114 * contact. September 2005. 115 * 116 * See http://www.iana.org/assignments/port-numbers 117 */ 118#define DEFAULT_GIT_PORT 9418 119 120/* 121 * Basic data structures for the directory cache 122 */ 123 124#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 125struct cache_header { 126uint32_t hdr_signature; 127uint32_t hdr_version; 128uint32_t hdr_entries; 129}; 130 131#define INDEX_FORMAT_LB 2 132#define INDEX_FORMAT_UB 4 133 134/* 135 * The "cache_time" is just the low 32 bits of the 136 * time. It doesn't matter if it overflows - we only 137 * check it for equality in the 32 bits we save. 138 */ 139struct cache_time { 140uint32_t sec; 141uint32_t nsec; 142}; 143 144struct stat_data { 145struct cache_time sd_ctime; 146struct cache_time sd_mtime; 147unsigned int sd_dev; 148unsigned int sd_ino; 149unsigned int sd_uid; 150unsigned int sd_gid; 151unsigned int sd_size; 152}; 153 154struct cache_entry { 155struct hashmap_entry ent; 156struct stat_data ce_stat_data; 157unsigned int ce_mode; 158unsigned int ce_flags; 159unsigned int ce_namelen; 160unsigned int index;/* for link extension */ 161struct object_id oid; 162char name[FLEX_ARRAY];/* more */ 163}; 164 165#define CE_STAGEMASK (0x3000) 166#define CE_EXTENDED (0x4000) 167#define CE_VALID (0x8000) 168#define CE_STAGESHIFT 12 169 170/* 171 * Range 0xFFFF0FFF in ce_flags is divided into 172 * two parts: in-memory flags and on-disk ones. 173 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 174 * if you want to save a new flag, add it in 175 * CE_EXTENDED_FLAGS 176 * 177 * In-memory only flags 178 */ 179#define CE_UPDATE (1 << 16) 180#define CE_REMOVE (1 << 17) 181#define CE_UPTODATE (1 << 18) 182#define CE_ADDED (1 << 19) 183 184#define CE_HASHED (1 << 20) 185#define CE_FSMONITOR_VALID (1 << 21) 186#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 187#define CE_CONFLICTED (1 << 23) 188 189#define CE_UNPACKED (1 << 24) 190#define CE_NEW_SKIP_WORKTREE (1 << 25) 191 192/* used to temporarily mark paths matched by pathspecs */ 193#define CE_MATCHED (1 << 26) 194 195#define CE_UPDATE_IN_BASE (1 << 27) 196#define CE_STRIP_NAME (1 << 28) 197 198/* 199 * Extended on-disk flags 200 */ 201#define CE_INTENT_TO_ADD (1 << 29) 202#define CE_SKIP_WORKTREE (1 << 30) 203/* CE_EXTENDED2 is for future extension */ 204#define CE_EXTENDED2 (1U << 31) 205 206#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 207 208/* 209 * Safeguard to avoid saving wrong flags: 210 * - CE_EXTENDED2 won't get saved until its semantic is known 211 * - Bits in 0x0000FFFF have been saved in ce_flags already 212 * - Bits in 0x003F0000 are currently in-memory flags 213 */ 214#if CE_EXTENDED_FLAGS & 0x803FFFFF 215#error"CE_EXTENDED_FLAGS out of range" 216#endif 217 218/* Forward structure decls */ 219struct pathspec; 220struct child_process; 221 222/* 223 * Copy the sha1 and stat state of a cache entry from one to 224 * another. But we never change the name, or the hash state! 225 */ 226staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 227const struct cache_entry *src) 228{ 229unsigned int state = dst->ce_flags & CE_HASHED; 230 231/* Don't copy hash chain and name */ 232memcpy(&dst->ce_stat_data, &src->ce_stat_data, 233offsetof(struct cache_entry, name) - 234offsetof(struct cache_entry, ce_stat_data)); 235 236/* Restore the hash state */ 237 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 238} 239 240staticinlineunsignedcreate_ce_flags(unsigned stage) 241{ 242return(stage << CE_STAGESHIFT); 243} 244 245#define ce_namelen(ce) ((ce)->ce_namelen) 246#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 247#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 248#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 249#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 250#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 251#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 252 253#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 254staticinlineunsigned intcreate_ce_mode(unsigned int mode) 255{ 256if(S_ISLNK(mode)) 257return S_IFLNK; 258if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 259return S_IFGITLINK; 260return S_IFREG |ce_permissions(mode); 261} 262staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 263unsigned int mode) 264{ 265externint trust_executable_bit, has_symlinks; 266if(!has_symlinks &&S_ISREG(mode) && 267 ce &&S_ISLNK(ce->ce_mode)) 268return ce->ce_mode; 269if(!trust_executable_bit &&S_ISREG(mode)) { 270if(ce &&S_ISREG(ce->ce_mode)) 271return ce->ce_mode; 272returncreate_ce_mode(0666); 273} 274returncreate_ce_mode(mode); 275} 276staticinlineintce_to_dtype(const struct cache_entry *ce) 277{ 278unsigned ce_mode =ntohl(ce->ce_mode); 279if(S_ISREG(ce_mode)) 280return DT_REG; 281else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 282return DT_DIR; 283else if(S_ISLNK(ce_mode)) 284return DT_LNK; 285else 286return DT_UNKNOWN; 287} 288staticinlineunsigned intcanon_mode(unsigned int mode) 289{ 290if(S_ISREG(mode)) 291return S_IFREG |ce_permissions(mode); 292if(S_ISLNK(mode)) 293return S_IFLNK; 294if(S_ISDIR(mode)) 295return S_IFDIR; 296return S_IFGITLINK; 297} 298 299#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 300 301#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 302#define CE_ENTRY_CHANGED (1 << 1) 303#define CE_ENTRY_REMOVED (1 << 2) 304#define CE_ENTRY_ADDED (1 << 3) 305#define RESOLVE_UNDO_CHANGED (1 << 4) 306#define CACHE_TREE_CHANGED (1 << 5) 307#define SPLIT_INDEX_ORDERED (1 << 6) 308#define UNTRACKED_CHANGED (1 << 7) 309#define FSMONITOR_CHANGED (1 << 8) 310 311struct split_index; 312struct untracked_cache; 313 314struct index_state { 315struct cache_entry **cache; 316unsigned int version; 317unsigned int cache_nr, cache_alloc, cache_changed; 318struct string_list *resolve_undo; 319struct cache_tree *cache_tree; 320struct split_index *split_index; 321struct cache_time timestamp; 322unsigned name_hash_initialized :1, 323 initialized :1, 324 drop_cache_tree :1; 325struct hashmap name_hash; 326struct hashmap dir_hash; 327struct object_id oid; 328struct untracked_cache *untracked; 329uint64_t fsmonitor_last_update; 330struct ewah_bitmap *fsmonitor_dirty; 331}; 332 333externstruct index_state the_index; 334 335/* Name hashing */ 336externinttest_lazy_init_name_hash(struct index_state *istate,int try_threaded); 337externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 338externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 339externvoidfree_name_hash(struct index_state *istate); 340 341 342/* Cache entry creation and cleanup */ 343 344/* 345 * Create cache_entry intended for use in the specified index. Caller 346 * is responsible for discarding the cache_entry with 347 * `discard_cache_entry`. 348 */ 349struct cache_entry *make_cache_entry(struct index_state *istate, 350unsigned int mode, 351const struct object_id *oid, 352const char*path, 353int stage, 354unsigned int refresh_options); 355 356struct cache_entry *make_empty_cache_entry(struct index_state *istate, 357size_t name_len); 358 359/* 360 * Create a cache_entry that is not intended to be added to an index. 361 * Caller is responsible for discarding the cache_entry 362 * with `discard_cache_entry`. 363 */ 364struct cache_entry *make_transient_cache_entry(unsigned int mode, 365const struct object_id *oid, 366const char*path, 367int stage); 368 369struct cache_entry *make_empty_transient_cache_entry(size_t name_len); 370 371/* 372 * Discard cache entry. 373 */ 374voiddiscard_cache_entry(struct cache_entry *ce); 375 376#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 377#define active_cache (the_index.cache) 378#define active_nr (the_index.cache_nr) 379#define active_alloc (the_index.cache_alloc) 380#define active_cache_changed (the_index.cache_changed) 381#define active_cache_tree (the_index.cache_tree) 382 383#define read_cache() read_index(&the_index) 384#define read_cache_from(path) read_index_from(&the_index, (path), (get_git_dir())) 385#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 386#define is_cache_unborn() is_index_unborn(&the_index) 387#define read_cache_unmerged() read_index_unmerged(&the_index) 388#define discard_cache() discard_index(&the_index) 389#define unmerged_cache() unmerged_index(&the_index) 390#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 391#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 392#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 393#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 394#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 395#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 396#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 397#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 398#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 399#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 400#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 401#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 402#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 403#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 404#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 405#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 406#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 407#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 408#endif 409 410#define TYPE_BITS 3 411 412/* 413 * Values in this enum (except those outside the 3 bit range) are part 414 * of pack file format. See Documentation/technical/pack-format.txt 415 * for more information. 416 */ 417enum object_type { 418 OBJ_BAD = -1, 419 OBJ_NONE =0, 420 OBJ_COMMIT =1, 421 OBJ_TREE =2, 422 OBJ_BLOB =3, 423 OBJ_TAG =4, 424/* 5 for future expansion */ 425 OBJ_OFS_DELTA =6, 426 OBJ_REF_DELTA =7, 427 OBJ_ANY, 428 OBJ_MAX 429}; 430 431staticinlineenum object_type object_type(unsigned int mode) 432{ 433returnS_ISDIR(mode) ? OBJ_TREE : 434S_ISGITLINK(mode) ? OBJ_COMMIT : 435 OBJ_BLOB; 436} 437 438/* Double-check local_repo_env below if you add to this list. */ 439#define GIT_DIR_ENVIRONMENT"GIT_DIR" 440#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 441#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 442#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 443#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 444#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 445#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 446#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 447#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 448#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 449#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 450#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 451#define CONFIG_ENVIRONMENT"GIT_CONFIG" 452#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 453#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 454#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 455#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 456#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 457#define GITATTRIBUTES_FILE".gitattributes" 458#define INFOATTRIBUTES_FILE"info/attributes" 459#define ATTRIBUTE_MACRO_PREFIX"[attr]" 460#define GITMODULES_FILE".gitmodules" 461#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 462#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 463#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 464#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 465#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 466#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 467#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 468#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 469#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 470#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 471#define GIT_OPTIONAL_LOCKS_ENVIRONMENT"GIT_OPTIONAL_LOCKS" 472#define GIT_TEXT_DOMAIN_DIR_ENVIRONMENT"GIT_TEXTDOMAINDIR" 473 474/* 475 * Environment variable used in handshaking the wire protocol. 476 * Contains a colon ':' separated list of keys with optional values 477 * 'key[=value]'. Presence of unknown keys and values must be 478 * ignored. 479 */ 480#define GIT_PROTOCOL_ENVIRONMENT"GIT_PROTOCOL" 481/* HTTP header used to handshake the wire protocol */ 482#define GIT_PROTOCOL_HEADER"Git-Protocol" 483 484/* 485 * This environment variable is expected to contain a boolean indicating 486 * whether we should or should not treat: 487 * 488 * GIT_DIR=foo.git git ... 489 * 490 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 491 * of this, but we use it internally to communicate to sub-processes that we 492 * are in a bare repo. If not set, defaults to true. 493 */ 494#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 495 496/* 497 * Repository-local GIT_* environment variables; these will be cleared 498 * when git spawns a sub-process that runs inside another repository. 499 * The array is NULL-terminated, which makes it easy to pass in the "env" 500 * parameter of a run-command invocation, or to do a simple walk. 501 */ 502externconst char*const local_repo_env[]; 503 504externvoidsetup_git_env(const char*git_dir); 505 506/* 507 * Returns true iff we have a configured git repository (either via 508 * setup_git_directory, or in the environment via $GIT_DIR). 509 */ 510inthave_git_dir(void); 511 512externint is_bare_repository_cfg; 513externintis_bare_repository(void); 514externintis_inside_git_dir(void); 515externchar*git_work_tree_cfg; 516externintis_inside_work_tree(void); 517externconst char*get_git_dir(void); 518externconst char*get_git_common_dir(void); 519externchar*get_object_directory(void); 520externchar*get_index_file(void); 521externchar*get_graft_file(void); 522externvoidset_git_dir(const char*path); 523externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 524externintget_common_dir(struct strbuf *sb,const char*gitdir); 525externconst char*get_git_namespace(void); 526externconst char*strip_namespace(const char*namespaced_ref); 527externconst char*get_super_prefix(void); 528externconst char*get_git_work_tree(void); 529 530/* 531 * Return true if the given path is a git directory; note that this _just_ 532 * looks at the directory itself. If you want to know whether "foo/.git" 533 * is a repository, you must feed that path, not just "foo". 534 */ 535externintis_git_directory(const char*path); 536 537/* 538 * Return 1 if the given path is the root of a git repository or 539 * submodule, else 0. Will not return 1 for bare repositories with the 540 * exception of creating a bare repository in "foo/.git" and calling 541 * is_git_repository("foo"). 542 * 543 * If we run into read errors, we err on the side of saying "yes, it is", 544 * as we usually consider sub-repos precious, and would prefer to err on the 545 * side of not disrupting or deleting them. 546 */ 547externintis_nonbare_repository_dir(struct strbuf *path); 548 549#define READ_GITFILE_ERR_STAT_FAILED 1 550#define READ_GITFILE_ERR_NOT_A_FILE 2 551#define READ_GITFILE_ERR_OPEN_FAILED 3 552#define READ_GITFILE_ERR_READ_FAILED 4 553#define READ_GITFILE_ERR_INVALID_FORMAT 5 554#define READ_GITFILE_ERR_NO_PATH 6 555#define READ_GITFILE_ERR_NOT_A_REPO 7 556#define READ_GITFILE_ERR_TOO_LARGE 8 557externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 558externconst char*read_gitfile_gently(const char*path,int*return_error_code); 559#define read_gitfile(path) read_gitfile_gently((path), NULL) 560externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 561#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 562 563externvoidset_git_work_tree(const char*tree); 564 565#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 566 567externvoidsetup_work_tree(void); 568/* 569 * Find the commondir and gitdir of the repository that contains the current 570 * working directory, without changing the working directory or other global 571 * state. The result is appended to commondir and gitdir. If the discovered 572 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 573 * both have the same result appended to the buffer. The return value is 574 * either 0 upon success and non-zero if no repository was found. 575 */ 576externintdiscover_git_directory(struct strbuf *commondir, 577struct strbuf *gitdir); 578externconst char*setup_git_directory_gently(int*); 579externconst char*setup_git_directory(void); 580externchar*prefix_path(const char*prefix,int len,const char*path); 581externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 582 583/* 584 * Concatenate "prefix" (if len is non-zero) and "path", with no 585 * connecting characters (so "prefix" should end with a "/"). 586 * Unlike prefix_path, this should be used if the named file does 587 * not have to interact with index entry; i.e. name of a random file 588 * on the filesystem. 589 * 590 * The return value is always a newly allocated string (even if the 591 * prefix was empty). 592 */ 593externchar*prefix_filename(const char*prefix,const char*path); 594 595externintcheck_filename(const char*prefix,const char*name); 596externvoidverify_filename(const char*prefix, 597const char*name, 598int diagnose_misspelt_rev); 599externvoidverify_non_filename(const char*prefix,const char*name); 600externintpath_inside_repo(const char*prefix,const char*path); 601 602#define INIT_DB_QUIET 0x0001 603#define INIT_DB_EXIST_OK 0x0002 604 605externintinit_db(const char*git_dir,const char*real_git_dir, 606const char*template_dir,unsigned int flags); 607 608externvoidsanitize_stdfds(void); 609externintdaemonize(void); 610 611#define alloc_nr(x) (((x)+16)*3/2) 612 613/* 614 * Realloc the buffer pointed at by variable 'x' so that it can hold 615 * at least 'nr' entries; the number of entries currently allocated 616 * is 'alloc', using the standard growing factor alloc_nr() macro. 617 * 618 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 619 */ 620#define ALLOC_GROW(x, nr, alloc) \ 621 do { \ 622 if ((nr) > alloc) { \ 623 if (alloc_nr(alloc) < (nr)) \ 624 alloc = (nr); \ 625 else \ 626 alloc = alloc_nr(alloc); \ 627 REALLOC_ARRAY(x, alloc); \ 628 } \ 629 } while (0) 630 631/* Initialize and use the cache information */ 632struct lock_file; 633externintread_index(struct index_state *); 634externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 635externintdo_read_index(struct index_state *istate,const char*path, 636int must_exist);/* for testting only! */ 637externintread_index_from(struct index_state *,const char*path, 638const char*gitdir); 639externintis_index_unborn(struct index_state *); 640externintread_index_unmerged(struct index_state *); 641 642/* For use with `write_locked_index()`. */ 643#define COMMIT_LOCK (1 << 0) 644#define SKIP_IF_UNCHANGED (1 << 1) 645 646/* 647 * Write the index while holding an already-taken lock. Close the lock, 648 * and if `COMMIT_LOCK` is given, commit it. 649 * 650 * Unless a split index is in use, write the index into the lockfile. 651 * 652 * With a split index, write the shared index to a temporary file, 653 * adjust its permissions and rename it into place, then write the 654 * split index to the lockfile. If the temporary file for the shared 655 * index cannot be created, fall back to the behavior described in 656 * the previous paragraph. 657 * 658 * With `COMMIT_LOCK`, the lock is always committed or rolled back. 659 * Without it, the lock is closed, but neither committed nor rolled 660 * back. 661 * 662 * If `SKIP_IF_UNCHANGED` is given and the index is unchanged, nothing 663 * is written (and the lock is rolled back if `COMMIT_LOCK` is given). 664 */ 665externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 666 667externintdiscard_index(struct index_state *); 668externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 669externintunmerged_index(const struct index_state *); 670 671/** 672 * Returns 1 if the index differs from HEAD, 0 otherwise. When on an unborn 673 * branch, returns 1 if there are entries in the index, 0 otherwise. If an 674 * strbuf is provided, the space-separated list of files that differ will be 675 * appended to it. 676 */ 677externintindex_has_changes(struct strbuf *sb); 678 679externintverify_path(const char*path,unsigned mode); 680externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 681externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 682externvoidadjust_dirname_case(struct index_state *istate,char*name); 683externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 684 685/* 686 * Searches for an entry defined by name and namelen in the given index. 687 * If the return value is positive (including 0) it is the position of an 688 * exact match. If the return value is negative, the negated value minus 1 689 * is the position where the entry would be inserted. 690 * Example: The current index consists of these files and its stages: 691 * 692 * b#0, d#0, f#1, f#3 693 * 694 * index_name_pos(&index, "a", 1) -> -1 695 * index_name_pos(&index, "b", 1) -> 0 696 * index_name_pos(&index, "c", 1) -> -2 697 * index_name_pos(&index, "d", 1) -> 1 698 * index_name_pos(&index, "e", 1) -> -3 699 * index_name_pos(&index, "f", 1) -> -3 700 * index_name_pos(&index, "g", 1) -> -5 701 */ 702externintindex_name_pos(const struct index_state *,const char*name,int namelen); 703 704#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 705#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 706#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 707#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 708#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 709#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 710externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 711externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 712 713/* Remove entry, return true if there are more entries to go. */ 714externintremove_index_entry_at(struct index_state *,int pos); 715 716externvoidremove_marked_cache_entries(struct index_state *istate); 717externintremove_file_from_index(struct index_state *,const char*path); 718#define ADD_CACHE_VERBOSE 1 719#define ADD_CACHE_PRETEND 2 720#define ADD_CACHE_IGNORE_ERRORS 4 721#define ADD_CACHE_IGNORE_REMOVAL 8 722#define ADD_CACHE_INTENT 16 723/* 724 * These two are used to add the contents of the file at path 725 * to the index, marking the working tree up-to-date by storing 726 * the cached stat info in the resulting cache entry. A caller 727 * that has already run lstat(2) on the path can call 728 * add_to_index(), and all others can call add_file_to_index(); 729 * the latter will do necessary lstat(2) internally before 730 * calling the former. 731 */ 732externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 733externintadd_file_to_index(struct index_state *,const char*path,int flags); 734 735externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 736externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 737externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 738externintindex_name_is_other(const struct index_state *,const char*,int); 739externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 740 741/* do stat comparison even if CE_VALID is true */ 742#define CE_MATCH_IGNORE_VALID 01 743/* do not check the contents but report dirty on racily-clean entries */ 744#define CE_MATCH_RACY_IS_DIRTY 02 745/* do stat comparison even if CE_SKIP_WORKTREE is true */ 746#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 747/* ignore non-existent files during stat update */ 748#define CE_MATCH_IGNORE_MISSING 0x08 749/* enable stat refresh */ 750#define CE_MATCH_REFRESH 0x10 751/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */ 752#define CE_MATCH_IGNORE_FSMONITOR 0X20 753externintie_match_stat(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 754externintie_modified(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 755 756#define HASH_WRITE_OBJECT 1 757#define HASH_FORMAT_CHECK 2 758#define HASH_RENORMALIZE 4 759externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 760externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 761 762/* 763 * Record to sd the data from st that we use to check whether a file 764 * might have changed. 765 */ 766externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 767 768/* 769 * Return 0 if st is consistent with a file not having been changed 770 * since sd was filled. If there are differences, return a 771 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 772 * INODE_CHANGED, and DATA_CHANGED. 773 */ 774externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 775externintmatch_stat_data_racy(const struct index_state *istate, 776const struct stat_data *sd,struct stat *st); 777 778externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 779 780#define REFRESH_REALLY 0x0001/* ignore_valid */ 781#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 782#define REFRESH_QUIET 0x0004/* be quiet about it */ 783#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 784#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 785#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 786externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 787externstruct cache_entry *refresh_cache_entry(struct index_state *,struct cache_entry *,unsigned int); 788 789/* 790 * Opportunistically update the index but do not complain if we can't. 791 * The lockfile is always committed or rolled back. 792 */ 793externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 794 795externinthold_locked_index(struct lock_file *,int); 796externvoidset_alternate_index_output(const char*); 797 798externint verify_index_checksum; 799externint verify_ce_order; 800 801/* Environment bits from configuration mechanism */ 802externint trust_executable_bit; 803externint trust_ctime; 804externint check_stat; 805externint quote_path_fully; 806externint has_symlinks; 807externint minimum_abbrev, default_abbrev; 808externint ignore_case; 809externint assume_unchanged; 810externint prefer_symlink_refs; 811externint warn_ambiguous_refs; 812externint warn_on_object_refname_ambiguity; 813externconst char*apply_default_whitespace; 814externconst char*apply_default_ignorewhitespace; 815externconst char*git_attributes_file; 816externconst char*git_hooks_path; 817externint zlib_compression_level; 818externint core_compression_level; 819externint pack_compression_level; 820externsize_t packed_git_window_size; 821externsize_t packed_git_limit; 822externsize_t delta_base_cache_limit; 823externunsigned long big_file_threshold; 824externunsigned long pack_size_limit_cfg; 825 826/* 827 * Accessors for the core.sharedrepository config which lazy-load the value 828 * from the config (if not already set). The "reset" function can be 829 * used to unset "set" or cached value, meaning that the value will be loaded 830 * fresh from the config file on the next call to get_shared_repository(). 831 */ 832voidset_shared_repository(int value); 833intget_shared_repository(void); 834voidreset_shared_repository(void); 835 836/* 837 * Do replace refs need to be checked this run? This variable is 838 * initialized to true unless --no-replace-object is used or 839 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 840 * commands that do not want replace references to be active. As an 841 * optimization it is also set to false if replace references have 842 * been sought but there were none. 843 */ 844externint check_replace_refs; 845externchar*git_replace_ref_base; 846 847externint fsync_object_files; 848externint core_preload_index; 849externint core_commit_graph; 850externint core_apply_sparse_checkout; 851externint precomposed_unicode; 852externint protect_hfs; 853externint protect_ntfs; 854externconst char*core_fsmonitor; 855 856/* 857 * Include broken refs in all ref iterations, which will 858 * generally choke dangerous operations rather than letting 859 * them silently proceed without taking the broken ref into 860 * account. 861 */ 862externint ref_paranoia; 863 864/* 865 * Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value). 866 */ 867intuse_optional_locks(void); 868 869/* 870 * The character that begins a commented line in user-editable file 871 * that is subject to stripspace. 872 */ 873externchar comment_line_char; 874externint auto_comment_line_char; 875 876/* Windows only */ 877enum hide_dotfiles_type { 878 HIDE_DOTFILES_FALSE =0, 879 HIDE_DOTFILES_TRUE, 880 HIDE_DOTFILES_DOTGITONLY 881}; 882externenum hide_dotfiles_type hide_dotfiles; 883 884enum log_refs_config { 885 LOG_REFS_UNSET = -1, 886 LOG_REFS_NONE =0, 887 LOG_REFS_NORMAL, 888 LOG_REFS_ALWAYS 889}; 890externenum log_refs_config log_all_ref_updates; 891 892enum branch_track { 893 BRANCH_TRACK_UNSPECIFIED = -1, 894 BRANCH_TRACK_NEVER =0, 895 BRANCH_TRACK_REMOTE, 896 BRANCH_TRACK_ALWAYS, 897 BRANCH_TRACK_EXPLICIT, 898 BRANCH_TRACK_OVERRIDE 899}; 900 901enum rebase_setup_type { 902 AUTOREBASE_NEVER =0, 903 AUTOREBASE_LOCAL, 904 AUTOREBASE_REMOTE, 905 AUTOREBASE_ALWAYS 906}; 907 908enum push_default_type { 909 PUSH_DEFAULT_NOTHING =0, 910 PUSH_DEFAULT_MATCHING, 911 PUSH_DEFAULT_SIMPLE, 912 PUSH_DEFAULT_UPSTREAM, 913 PUSH_DEFAULT_CURRENT, 914 PUSH_DEFAULT_UNSPECIFIED 915}; 916 917externenum branch_track git_branch_track; 918externenum rebase_setup_type autorebase; 919externenum push_default_type push_default; 920 921enum object_creation_mode { 922 OBJECT_CREATION_USES_HARDLINKS =0, 923 OBJECT_CREATION_USES_RENAMES =1 924}; 925 926externenum object_creation_mode object_creation_mode; 927 928externchar*notes_ref_name; 929 930externint grafts_replace_parents; 931 932/* 933 * GIT_REPO_VERSION is the version we write by default. The 934 * _READ variant is the highest number we know how to 935 * handle. 936 */ 937#define GIT_REPO_VERSION 0 938#define GIT_REPO_VERSION_READ 1 939externint repository_format_precious_objects; 940externchar*repository_format_partial_clone; 941externconst char*core_partial_clone_filter_default; 942 943struct repository_format { 944int version; 945int precious_objects; 946char*partial_clone;/* value of extensions.partialclone */ 947int is_bare; 948int hash_algo; 949char*work_tree; 950struct string_list unknown_extensions; 951}; 952 953/* 954 * Read the repository format characteristics from the config file "path" into 955 * "format" struct. Returns the numeric version. On error, -1 is returned, 956 * format->version is set to -1, and all other fields in the struct are 957 * undefined. 958 */ 959intread_repository_format(struct repository_format *format,const char*path); 960 961/* 962 * Verify that the repository described by repository_format is something we 963 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 964 * any errors encountered. 965 */ 966intverify_repository_format(const struct repository_format *format, 967struct strbuf *err); 968 969/* 970 * Check the repository format version in the path found in get_git_dir(), 971 * and die if it is a version we don't understand. Generally one would 972 * set_git_dir() before calling this, and use it only for "are we in a valid 973 * repo?". 974 */ 975externvoidcheck_repository_format(void); 976 977#define MTIME_CHANGED 0x0001 978#define CTIME_CHANGED 0x0002 979#define OWNER_CHANGED 0x0004 980#define MODE_CHANGED 0x0008 981#define INODE_CHANGED 0x0010 982#define DATA_CHANGED 0x0020 983#define TYPE_CHANGED 0x0040 984 985/* 986 * Return an abbreviated sha1 unique within this repository's object database. 987 * The result will be at least `len` characters long, and will be NUL 988 * terminated. 989 * 990 * The non-`_r` version returns a static buffer which remains valid until 4 991 * more calls to find_unique_abbrev are made. 992 * 993 * The `_r` variant writes to a buffer supplied by the caller, which must be at 994 * least `GIT_MAX_HEXSZ + 1` bytes. The return value is the number of bytes 995 * written (excluding the NUL terminator). 996 * 997 * Note that while this version avoids the static buffer, it is not fully 998 * reentrant, as it calls into other non-reentrant git code. 999 */1000externconst char*find_unique_abbrev(const struct object_id *oid,int len);1001externintfind_unique_abbrev_r(char*hex,const struct object_id *oid,int len);10021003externconst unsigned char null_sha1[GIT_MAX_RAWSZ];1004externconst struct object_id null_oid;10051006staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2)1007{1008returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ);1009}10101011staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2)1012{1013returnhashcmp(oid1->hash, oid2->hash);1014}10151016staticinlineintis_null_sha1(const unsigned char*sha1)1017{1018return!hashcmp(sha1, null_sha1);1019}10201021staticinlineintis_null_oid(const struct object_id *oid)1022{1023return!hashcmp(oid->hash, null_sha1);1024}10251026staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src)1027{1028memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ);1029}10301031staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src)1032{1033hashcpy(dst->hash, src->hash);1034}10351036staticinlinestruct object_id *oiddup(const struct object_id *src)1037{1038struct object_id *dst =xmalloc(sizeof(struct object_id));1039oidcpy(dst, src);1040return dst;1041}10421043staticinlinevoidhashclr(unsigned char*hash)1044{1045memset(hash,0, GIT_SHA1_RAWSZ);1046}10471048staticinlinevoidoidclr(struct object_id *oid)1049{1050memset(oid->hash,0, GIT_MAX_RAWSZ);1051}10521053staticinlinevoidoidread(struct object_id *oid,const unsigned char*hash)1054{1055memcpy(oid->hash, hash, the_hash_algo->rawsz);1056}10571058staticinlineintis_empty_blob_sha1(const unsigned char*sha1)1059{1060return!hashcmp(sha1, the_hash_algo->empty_blob->hash);1061}10621063staticinlineintis_empty_blob_oid(const struct object_id *oid)1064{1065return!oidcmp(oid, the_hash_algo->empty_blob);1066}10671068staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1069{1070return!hashcmp(sha1, the_hash_algo->empty_tree->hash);1071}10721073staticinlineintis_empty_tree_oid(const struct object_id *oid)1074{1075return!oidcmp(oid, the_hash_algo->empty_tree);1076}10771078const char*empty_tree_oid_hex(void);1079const char*empty_blob_oid_hex(void);10801081/* set default permissions by passing mode arguments to open(2) */1082intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1083intgit_mkstemp_mode(char*pattern,int mode);10841085/*1086 * NOTE NOTE NOTE!!1087 *1088 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1089 * not be changed. Old repositories have core.sharedrepository written in1090 * numeric format, and therefore these values are preserved for compatibility1091 * reasons.1092 */1093enum sharedrepo {1094 PERM_UMASK =0,1095 OLD_PERM_GROUP =1,1096 OLD_PERM_EVERYBODY =2,1097 PERM_GROUP =0660,1098 PERM_EVERYBODY =06641099};1100intgit_config_perm(const char*var,const char*value);1101intadjust_shared_perm(const char*path);11021103/*1104 * Create the directory containing the named path, using care to be1105 * somewhat safe against races. Return one of the scld_error values to1106 * indicate success/failure. On error, set errno to describe the1107 * problem.1108 *1109 * SCLD_VANISHED indicates that one of the ancestor directories of the1110 * path existed at one point during the function call and then1111 * suddenly vanished, probably because another process pruned the1112 * directory while we were working. To be robust against this kind of1113 * race, callers might want to try invoking the function again when it1114 * returns SCLD_VANISHED.1115 *1116 * safe_create_leading_directories() temporarily changes path while it1117 * is working but restores it before returning.1118 * safe_create_leading_directories_const() doesn't modify path, even1119 * temporarily.1120 */1121enum scld_error {1122 SCLD_OK =0,1123 SCLD_FAILED = -1,1124 SCLD_PERMS = -2,1125 SCLD_EXISTS = -3,1126 SCLD_VANISHED = -41127};1128enum scld_error safe_create_leading_directories(char*path);1129enum scld_error safe_create_leading_directories_const(const char*path);11301131/*1132 * Callback function for raceproof_create_file(). This function is1133 * expected to do something that makes dirname(path) permanent despite1134 * the fact that other processes might be cleaning up empty1135 * directories at the same time. Usually it will create a file named1136 * path, but alternatively it could create another file in that1137 * directory, or even chdir() into that directory. The function should1138 * return 0 if the action was completed successfully. On error, it1139 * should return a nonzero result and set errno.1140 * raceproof_create_file() treats two errno values specially:1141 *1142 * - ENOENT -- dirname(path) does not exist. In this case,1143 * raceproof_create_file() tries creating dirname(path)1144 * (and any parent directories, if necessary) and calls1145 * the function again.1146 *1147 * - EISDIR -- the file already exists and is a directory. In this1148 * case, raceproof_create_file() removes the directory if1149 * it is empty (and recursively any empty directories that1150 * it contains) and calls the function again.1151 *1152 * Any other errno causes raceproof_create_file() to fail with the1153 * callback's return value and errno.1154 *1155 * Obviously, this function should be OK with being called again if it1156 * fails with ENOENT or EISDIR. In other scenarios it will not be1157 * called again.1158 */1159typedefintcreate_file_fn(const char*path,void*cb);11601161/*1162 * Create a file in dirname(path) by calling fn, creating leading1163 * directories if necessary. Retry a few times in case we are racing1164 * with another process that is trying to clean up the directory that1165 * contains path. See the documentation for create_file_fn for more1166 * details.1167 *1168 * Return the value and set the errno that resulted from the most1169 * recent call of fn. fn is always called at least once, and will be1170 * called more than once if it returns ENOENT or EISDIR.1171 */1172intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11731174intmkdir_in_gitdir(const char*path);1175externchar*expand_user_path(const char*path,int real_home);1176const char*enter_repo(const char*path,int strict);1177staticinlineintis_absolute_path(const char*path)1178{1179returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1180}1181intis_directory(const char*);1182char*strbuf_realpath(struct strbuf *resolved,const char*path,1183int die_on_error);1184const char*real_path(const char*path);1185const char*real_path_if_valid(const char*path);1186char*real_pathdup(const char*path,int die_on_error);1187const char*absolute_path(const char*path);1188char*absolute_pathdup(const char*path);1189const char*remove_leading_path(const char*in,const char*prefix);1190const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1191intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1192intnormalize_path_copy(char*dst,const char*src);1193intlongest_ancestor_length(const char*path,struct string_list *prefixes);1194char*strip_path_suffix(const char*path,const char*suffix);1195intdaemon_avoid_alias(const char*path);11961197/*1198 * These functions match their is_hfs_dotgit() counterparts; see utf8.h for1199 * details.1200 */1201intis_ntfs_dotgit(const char*name);1202intis_ntfs_dotgitmodules(const char*name);1203intis_ntfs_dotgitignore(const char*name);1204intis_ntfs_dotgitattributes(const char*name);12051206/*1207 * Returns true iff "str" could be confused as a command-line option when1208 * passed to a sub-program like "ssh". Note that this has nothing to do with1209 * shell-quoting, which should be handled separately; we're assuming here that1210 * the string makes it verbatim to the sub-program.1211 */1212intlooks_like_command_line_option(const char*str);12131214/**1215 * Return a newly allocated string with the evaluation of1216 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1217 * "$HOME/.config/git/$filename". Return NULL upon error.1218 */1219externchar*xdg_config_home(const char*filename);12201221/**1222 * Return a newly allocated string with the evaluation of1223 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1224 * "$HOME/.cache/git/$filename". Return NULL upon error.1225 */1226externchar*xdg_cache_home(const char*filename);12271228externvoid*read_object_file_extended(const struct object_id *oid,1229enum object_type *type,1230unsigned long*size,int lookup_replace);1231staticinlinevoid*read_object_file(const struct object_id *oid,enum object_type *type,unsigned long*size)1232{1233returnread_object_file_extended(oid, type, size,1);1234}12351236/* Read and unpack an object file into memory, write memory to an object file */1237intoid_object_info(struct repository *r,const struct object_id *,unsigned long*);12381239externinthash_object_file(const void*buf,unsigned long len,1240const char*type,struct object_id *oid);12411242externintwrite_object_file(const void*buf,unsigned long len,1243const char*type,struct object_id *oid);12441245externinthash_object_file_literally(const void*buf,unsigned long len,1246const char*type,struct object_id *oid,1247unsigned flags);12481249externintpretend_object_file(void*,unsigned long,enum object_type,1250struct object_id *oid);12511252externintforce_object_loose(const struct object_id *oid,time_t mtime);12531254externintgit_open_cloexec(const char*name,int flags);1255#define git_open(name) git_open_cloexec(name, O_RDONLY)1256externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1257externintparse_sha1_header(const char*hdr,unsigned long*sizep);12581259externintcheck_object_signature(const struct object_id *oid,void*buf,unsigned long size,const char*type);12601261externintfinalize_object_file(const char*tmpfile,const char*filename);12621263/*1264 * Open the loose object at path, check its hash, and return the contents,1265 * type, and size. If the object is a blob, then "contents" may return NULL,1266 * to allow streaming of large blobs.1267 *1268 * Returns 0 on success, negative on error (details may be written to stderr).1269 */1270intread_loose_object(const char*path,1271const struct object_id *expected_oid,1272enum object_type *type,1273unsigned long*size,1274void**contents);12751276/*1277 * Convenience for sha1_object_info_extended() with a NULL struct1278 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1279 * nonzero flags to also set other flags.1280 */1281externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1282staticinlineinthas_sha1_file(const unsigned char*sha1)1283{1284returnhas_sha1_file_with_flags(sha1,0);1285}12861287/* Same as the above, except for struct object_id. */1288externinthas_object_file(const struct object_id *oid);1289externinthas_object_file_with_flags(const struct object_id *oid,int flags);12901291/*1292 * Return true iff an alternate object database has a loose object1293 * with the specified name. This function does not respect replace1294 * references.1295 */1296externinthas_loose_object_nonlocal(const struct object_id *oid);12971298externvoidassert_oid_type(const struct object_id *oid,enum object_type expect);12991300/* Helper to check and "touch" a file */1301externintcheck_and_freshen_file(const char*fn,int freshen);13021303externconst signed char hexval_table[256];1304staticinlineunsigned inthexval(unsigned char c)1305{1306return hexval_table[c];1307}13081309/*1310 * Convert two consecutive hexadecimal digits into a char. Return a1311 * negative value on error. Don't run over the end of short strings.1312 */1313staticinlineinthex2chr(const char*s)1314{1315unsigned int val =hexval(s[0]);1316return(val & ~0xf) ? val : (val <<4) |hexval(s[1]);1317}13181319/* Convert to/from hex/sha1 representation */1320#define MINIMUM_ABBREV minimum_abbrev1321#define DEFAULT_ABBREV default_abbrev13221323/* used when the code does not know or care what the default abbrev is */1324#define FALLBACK_DEFAULT_ABBREV 713251326struct object_context {1327unsigned mode;1328/*1329 * symlink_path is only used by get_tree_entry_follow_symlinks,1330 * and only for symlinks that point outside the repository.1331 */1332struct strbuf symlink_path;1333/*1334 * If GET_OID_RECORD_PATH is set, this will record path (if any)1335 * found when resolving the name. The caller is responsible for1336 * releasing the memory.1337 */1338char*path;1339};13401341#define GET_OID_QUIETLY 011342#define GET_OID_COMMIT 021343#define GET_OID_COMMITTISH 041344#define GET_OID_TREE 0101345#define GET_OID_TREEISH 0201346#define GET_OID_BLOB 0401347#define GET_OID_FOLLOW_SYMLINKS 01001348#define GET_OID_RECORD_PATH 02001349#define GET_OID_ONLY_TO_DIE 0400013501351#define GET_OID_DISAMBIGUATORS \1352 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1353 GET_OID_TREE | GET_OID_TREEISH | \1354 GET_OID_BLOB)13551356externintget_oid(const char*str,struct object_id *oid);1357externintget_oid_commit(const char*str,struct object_id *oid);1358externintget_oid_committish(const char*str,struct object_id *oid);1359externintget_oid_tree(const char*str,struct object_id *oid);1360externintget_oid_treeish(const char*str,struct object_id *oid);1361externintget_oid_blob(const char*str,struct object_id *oid);1362externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1363externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);136413651366typedefinteach_abbrev_fn(const struct object_id *oid,void*);1367externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13681369externintset_disambiguate_hint_config(const char*var,const char*value);13701371/*1372 * Try to read a SHA1 in hexadecimal format from the 40 characters1373 * starting at hex. Write the 20-byte result to sha1 in binary form.1374 * Return 0 on success. Reading stops if a NUL is encountered in the1375 * input, so it is safe to pass this function an arbitrary1376 * null-terminated string.1377 */1378externintget_sha1_hex(const char*hex,unsigned char*sha1);1379externintget_oid_hex(const char*hex,struct object_id *sha1);13801381/*1382 * Read `len` pairs of hexadecimal digits from `hex` and write the1383 * values to `binary` as `len` bytes. Return 0 on success, or -1 if1384 * the input does not consist of hex digits).1385 */1386externinthex_to_bytes(unsigned char*binary,const char*hex,size_t len);13871388/*1389 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1390 * and writes the NUL-terminated output to the buffer `out`, which must be at1391 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1392 * convenience.1393 *1394 * The non-`_r` variant returns a static buffer, but uses a ring of 41395 * buffers, making it safe to make multiple calls for a single statement, like:1396 *1397 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1398 */1399externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1400externchar*oid_to_hex_r(char*out,const struct object_id *oid);1401externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1402externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */14031404/*1405 * Parse a 40-character hexadecimal object ID starting from hex, updating the1406 * pointer specified by end when parsing stops. The resulting object ID is1407 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1408 * other invalid character. end is only updated on success; otherwise, it is1409 * unmodified.1410 */1411externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);14121413/*1414 * This reads short-hand syntax that not only evaluates to a commit1415 * object name, but also can act as if the end user spelled the name1416 * of the branch from the command line.1417 *1418 * - "@{-N}" finds the name of the Nth previous branch we were on, and1419 * places the name of the branch in the given buf and returns the1420 * number of characters parsed if successful.1421 *1422 * - "<branch>@{upstream}" finds the name of the other ref that1423 * <branch> is configured to merge with (missing <branch> defaults1424 * to the current branch), and places the name of the branch in the1425 * given buf and returns the number of characters parsed if1426 * successful.1427 *1428 * If the input is not of the accepted format, it returns a negative1429 * number to signal an error.1430 *1431 * If the input was ok but there are not N branch switches in the1432 * reflog, it returns 0.1433 *1434 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1435 * expansions: local branches ("refs/heads/"), remote branches1436 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1437 * allowed, even ones to refs outside of those namespaces.1438 */1439#define INTERPRET_BRANCH_LOCAL (1<<0)1440#define INTERPRET_BRANCH_REMOTE (1<<1)1441#define INTERPRET_BRANCH_HEAD (1<<2)1442externintinterpret_branch_name(const char*str,int len,struct strbuf *,1443unsigned allowed);1444externintget_oid_mb(const char*str,struct object_id *oid);14451446externintvalidate_headref(const char*ref);14471448externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1449externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1450externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1451externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);14521453externvoid*read_object_with_reference(const struct object_id *oid,1454const char*required_type,1455unsigned long*size,1456struct object_id *oid_ret);14571458externstruct object *peel_to_type(const char*name,int namelen,1459struct object *o,enum object_type);14601461struct date_mode {1462enum date_mode_type {1463 DATE_NORMAL =0,1464 DATE_RELATIVE,1465 DATE_SHORT,1466 DATE_ISO8601,1467 DATE_ISO8601_STRICT,1468 DATE_RFC2822,1469 DATE_STRFTIME,1470 DATE_RAW,1471 DATE_UNIX1472} type;1473const char*strftime_fmt;1474int local;1475};14761477/*1478 * Convenience helper for passing a constant type, like:1479 *1480 * show_date(t, tz, DATE_MODE(NORMAL));1481 */1482#define DATE_MODE(t) date_mode_from_type(DATE_##t)1483struct date_mode *date_mode_from_type(enum date_mode_type type);14841485const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1486voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1487struct strbuf *timebuf);1488intparse_date(const char*date,struct strbuf *out);1489intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1490intparse_expiry_date(const char*date, timestamp_t *timestamp);1491voiddatestamp(struct strbuf *out);1492#define approxidate(s) approxidate_careful((s), NULL)1493timestamp_t approxidate_careful(const char*,int*);1494timestamp_t approxidate_relative(const char*date,const struct timeval *now);1495voidparse_date_format(const char*format,struct date_mode *mode);1496intdate_overflows(timestamp_t date);14971498#define IDENT_STRICT 11499#define IDENT_NO_DATE 21500#define IDENT_NO_NAME 41501externconst char*git_author_info(int);1502externconst char*git_committer_info(int);1503externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1504externconst char*fmt_name(const char*name,const char*email);1505externconst char*ident_default_name(void);1506externconst char*ident_default_email(void);1507externconst char*git_editor(void);1508externconst char*git_pager(int stdout_is_tty);1509externintis_terminal_dumb(void);1510externintgit_ident_config(const char*,const char*,void*);1511externvoidreset_ident_date(void);15121513struct ident_split {1514const char*name_begin;1515const char*name_end;1516const char*mail_begin;1517const char*mail_end;1518const char*date_begin;1519const char*date_end;1520const char*tz_begin;1521const char*tz_end;1522};1523/*1524 * Signals an success with 0, but time part of the result may be NULL1525 * if the input lacks timestamp and zone1526 */1527externintsplit_ident_line(struct ident_split *,const char*,int);15281529/*1530 * Like show_date, but pull the timestamp and tz parameters from1531 * the ident_split. It will also sanity-check the values and produce1532 * a well-known sentinel date if they appear bogus.1533 */1534const char*show_ident_date(const struct ident_split *id,1535const struct date_mode *mode);15361537/*1538 * Compare split idents for equality or strict ordering. Note that we1539 * compare only the ident part of the line, ignoring any timestamp.1540 *1541 * Because there are two fields, we must choose one as the primary key; we1542 * currently arbitrarily pick the email.1543 */1544externintident_cmp(const struct ident_split *,const struct ident_split *);15451546struct checkout {1547struct index_state *istate;1548const char*base_dir;1549int base_dir_len;1550struct delayed_checkout *delayed_checkout;1551unsigned force:1,1552 quiet:1,1553 not_new:1,1554 refresh_cache:1;1555};1556#define CHECKOUT_INIT { NULL,"" }15571558#define TEMPORARY_FILENAME_LENGTH 251559externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1560externvoidenable_delayed_checkout(struct checkout *state);1561externintfinish_delayed_checkout(struct checkout *state);15621563struct cache_def {1564struct strbuf path;1565int flags;1566int track_flags;1567int prefix_len_stat_func;1568};1569#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1570staticinlinevoidcache_def_clear(struct cache_def *cache)1571{1572strbuf_release(&cache->path);1573}15741575externinthas_symlink_leading_path(const char*name,int len);1576externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1577externintcheck_leading_path(const char*name,int len);1578externinthas_dirs_only_path(const char*name,int len,int prefix_len);1579externvoidschedule_dir_for_removal(const char*name,int len);1580externvoidremove_scheduled_dirs(void);15811582struct pack_window {1583struct pack_window *next;1584unsigned char*base;1585 off_t offset;1586size_t len;1587unsigned int last_used;1588unsigned int inuse_cnt;1589};15901591struct pack_entry {1592 off_t offset;1593struct packed_git *p;1594};15951596/*1597 * Create a temporary file rooted in the object database directory, or1598 * die on failure. The filename is taken from "pattern", which should have the1599 * usual "XXXXXX" trailer, and the resulting filename is written into the1600 * "template" buffer. Returns the open descriptor.1601 */1602externintodb_mkstemp(struct strbuf *temp_filename,const char*pattern);16031604/*1605 * Create a pack .keep file named "name" (which should generally be the output1606 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1607 * error.1608 */1609externintodb_pack_keep(const char*name);16101611/*1612 * Iterate over the files in the loose-object parts of the object1613 * directory "path", triggering the following callbacks:1614 *1615 * - loose_object is called for each loose object we find.1616 *1617 * - loose_cruft is called for any files that do not appear to be1618 * loose objects. Note that we only look in the loose object1619 * directories "objects/[0-9a-f]{2}/", so we will not report1620 * "objects/foobar" as cruft.1621 *1622 * - loose_subdir is called for each top-level hashed subdirectory1623 * of the object directory (e.g., "$OBJDIR/f0"). It is called1624 * after the objects in the directory are processed.1625 *1626 * Any callback that is NULL will be ignored. Callbacks returning non-zero1627 * will end the iteration.1628 *1629 * In the "buf" variant, "path" is a strbuf which will also be used as a1630 * scratch buffer, but restored to its original contents before1631 * the function returns.1632 */1633typedefinteach_loose_object_fn(const struct object_id *oid,1634const char*path,1635void*data);1636typedefinteach_loose_cruft_fn(const char*basename,1637const char*path,1638void*data);1639typedefinteach_loose_subdir_fn(unsigned int nr,1640const char*path,1641void*data);1642intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1643struct strbuf *path,1644 each_loose_object_fn obj_cb,1645 each_loose_cruft_fn cruft_cb,1646 each_loose_subdir_fn subdir_cb,1647void*data);1648intfor_each_loose_file_in_objdir(const char*path,1649 each_loose_object_fn obj_cb,1650 each_loose_cruft_fn cruft_cb,1651 each_loose_subdir_fn subdir_cb,1652void*data);1653intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1654 each_loose_object_fn obj_cb,1655 each_loose_cruft_fn cruft_cb,1656 each_loose_subdir_fn subdir_cb,1657void*data);16581659/*1660 * Iterate over loose objects in both the local1661 * repository and any alternates repositories (unless the1662 * LOCAL_ONLY flag is set).1663 */1664#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11665externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);16661667struct object_info {1668/* Request */1669enum object_type *typep;1670unsigned long*sizep;1671 off_t *disk_sizep;1672unsigned char*delta_base_sha1;1673struct strbuf *type_name;1674void**contentp;16751676/* Response */1677enum{1678 OI_CACHED,1679 OI_LOOSE,1680 OI_PACKED,1681 OI_DBCACHED1682} whence;1683union{1684/*1685 * struct {1686 * ... Nothing to expose in this case1687 * } cached;1688 * struct {1689 * ... Nothing to expose in this case1690 * } loose;1691 */1692struct{1693struct packed_git *pack;1694 off_t offset;1695unsigned int is_delta;1696} packed;1697} u;1698};16991700/*1701 * Initializer for a "struct object_info" that wants no items. You may1702 * also memset() the memory to all-zeroes.1703 */1704#define OBJECT_INFO_INIT {NULL}17051706/* Invoke lookup_replace_object() on the given hash */1707#define OBJECT_INFO_LOOKUP_REPLACE 11708/* Allow reading from a loose object file of unknown/bogus type */1709#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21710/* Do not check cached storage */1711#define OBJECT_INFO_SKIP_CACHED 41712/* Do not retry packed storage after checking packed and loose storage */1713#define OBJECT_INFO_QUICK 81714/* Do not check loose object */1715#define OBJECT_INFO_IGNORE_LOOSE 1617161717intoid_object_info_extended(struct repository *r,1718const struct object_id *,1719struct object_info *,unsigned flags);17201721/*1722 * Set this to 0 to prevent sha1_object_info_extended() from fetching missing1723 * blobs. This has a difference only if extensions.partialClone is set.1724 *1725 * Its default value is 1.1726 */1727externint fetch_if_missing;17281729/* Dumb servers support */1730externintupdate_server_info(int);17311732externconst char*get_log_output_encoding(void);1733externconst char*get_commit_output_encoding(void);17341735/*1736 * This is a hack for test programs like test-dump-untracked-cache to1737 * ensure that they do not modify the untracked cache when reading it.1738 * Do not use it otherwise!1739 */1740externint ignore_untracked_cache_config;17411742externintcommitter_ident_sufficiently_given(void);1743externintauthor_ident_sufficiently_given(void);17441745externconst char*git_commit_encoding;1746externconst char*git_log_output_encoding;1747externconst char*git_mailmap_file;1748externconst char*git_mailmap_blob;17491750/* IO helper functions */1751externvoidmaybe_flush_or_die(FILE*,const char*);1752__attribute__((format(printf,2,3)))1753externvoidfprintf_or_die(FILE*,const char*fmt, ...);17541755#define COPY_READ_ERROR (-2)1756#define COPY_WRITE_ERROR (-3)1757externintcopy_fd(int ifd,int ofd);1758externintcopy_file(const char*dst,const char*src,int mode);1759externintcopy_file_with_time(const char*dst,const char*src,int mode);17601761externvoidwrite_or_die(int fd,const void*buf,size_t count);1762externvoidfsync_or_die(int fd,const char*);17631764extern ssize_t read_in_full(int fd,void*buf,size_t count);1765extern ssize_t write_in_full(int fd,const void*buf,size_t count);1766extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17671768staticinline ssize_t write_str_in_full(int fd,const char*str)1769{1770returnwrite_in_full(fd, str,strlen(str));1771}17721773/**1774 * Open (and truncate) the file at path, write the contents of buf to it,1775 * and close it. Dies if any errors are encountered.1776 */1777externvoidwrite_file_buf(const char*path,const char*buf,size_t len);17781779/**1780 * Like write_file_buf(), but format the contents into a buffer first.1781 * Additionally, write_file() will append a newline if one is not already1782 * present, making it convenient to write text files:1783 *1784 * write_file(path, "counter: %d", ctr);1785 */1786__attribute__((format(printf,2,3)))1787externvoidwrite_file(const char*path,const char*fmt, ...);17881789/* pager.c */1790externvoidsetup_pager(void);1791externintpager_in_use(void);1792externint pager_use_color;1793externintterm_columns(void);1794externintdecimal_width(uintmax_t);1795externintcheck_pager_config(const char*cmd);1796externvoidprepare_pager_args(struct child_process *,const char*pager);17971798externconst char*editor_program;1799externconst char*askpass_program;1800externconst char*excludes_file;18011802/* base85 */1803intdecode_85(char*dst,const char*line,int linelen);1804voidencode_85(char*buf,const unsigned char*data,int bytes);18051806/* alloc.c */1807externvoid*alloc_blob_node(void);1808externvoid*alloc_tree_node(void);1809externvoid*alloc_commit_node(void);1810externvoid*alloc_tag_node(void);1811externvoid*alloc_object_node(void);1812externvoidalloc_report(void);1813externunsigned intalloc_commit_index(void);18141815/* pkt-line.c */1816voidpacket_trace_identity(const char*prog);18171818/* add */1819/*1820 * return 0 if success, 1 - if addition of a file failed and1821 * ADD_FILES_IGNORE_ERRORS was specified in flags1822 */1823intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);18241825/* diff.c */1826externint diff_auto_refresh_index;18271828/* match-trees.c */1829voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1830voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);18311832/*1833 * whitespace rules.1834 * used by both diff and apply1835 * last two digits are tab width1836 */1837#define WS_BLANK_AT_EOL 01001838#define WS_SPACE_BEFORE_TAB 02001839#define WS_INDENT_WITH_NON_TAB 04001840#define WS_CR_AT_EOL 010001841#define WS_BLANK_AT_EOF 020001842#define WS_TAB_IN_INDENT 040001843#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1844#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1845#define WS_TAB_WIDTH_MASK 0771846/* All WS_* -- when extended, adapt diff.c emit_symbol */1847#define WS_RULE_MASK 077771848externunsigned whitespace_rule_cfg;1849externunsignedwhitespace_rule(const char*);1850externunsignedparse_whitespace_rule(const char*);1851externunsignedws_check(const char*line,int len,unsigned ws_rule);1852externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1853externchar*whitespace_error_string(unsigned ws);1854externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1855externintws_blank_line(const char*line,int len,unsigned ws_rule);1856#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18571858/* ls-files */1859voidoverlay_tree_on_index(struct index_state *istate,1860const char*tree_name,const char*prefix);18611862/* setup.c */1863struct startup_info {1864int have_repository;1865const char*prefix;1866};1867externstruct startup_info *startup_info;18681869/* merge.c */1870struct commit_list;1871inttry_merge_command(const char*strategy,size_t xopts_nr,1872const char**xopts,struct commit_list *common,1873const char*head_arg,struct commit_list *remotes);1874intcheckout_fast_forward(const struct object_id *from,1875const struct object_id *to,1876int overwrite_ignore);187718781879intsane_execvp(const char*file,char*const argv[]);18801881/*1882 * A struct to encapsulate the concept of whether a file has changed1883 * since we last checked it. This uses criteria similar to those used1884 * for the index.1885 */1886struct stat_validity {1887struct stat_data *sd;1888};18891890voidstat_validity_clear(struct stat_validity *sv);18911892/*1893 * Returns 1 if the path is a regular file (or a symlink to a regular1894 * file) and matches the saved stat_validity, 0 otherwise. A missing1895 * or inaccessible file is considered a match if the struct was just1896 * initialized, or if the previous update found an inaccessible file.1897 */1898intstat_validity_check(struct stat_validity *sv,const char*path);18991900/*1901 * Update the stat_validity from a file opened at descriptor fd. If1902 * the file is missing, inaccessible, or not a regular file, then1903 * future calls to stat_validity_check will match iff one of those1904 * conditions continues to be true.1905 */1906voidstat_validity_update(struct stat_validity *sv,int fd);19071908intversioncmp(const char*s1,const char*s2);1909voidsleep_millisec(int millisec);19101911/*1912 * Create a directory and (if share is nonzero) adjust its permissions1913 * according to the shared_repository setting. Only use this for1914 * directories under $GIT_DIR. Don't use it for working tree1915 * directories.1916 */1917voidsafe_create_dir(const char*dir,int share);19181919/*1920 * Should we print an ellipsis after an abbreviated SHA-1 value1921 * when doing diff-raw output or indicating a detached HEAD?1922 */1923externintprint_sha1_ellipsis(void);19241925#endif/* CACHE_H */