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; 327unsigned char sha1[20]; 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#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 343#define active_cache (the_index.cache) 344#define active_nr (the_index.cache_nr) 345#define active_alloc (the_index.cache_alloc) 346#define active_cache_changed (the_index.cache_changed) 347#define active_cache_tree (the_index.cache_tree) 348 349#define read_cache() read_index(&the_index) 350#define read_cache_from(path) read_index_from(&the_index, (path), (get_git_dir())) 351#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 352#define is_cache_unborn() is_index_unborn(&the_index) 353#define read_cache_unmerged() read_index_unmerged(&the_index) 354#define discard_cache() discard_index(&the_index) 355#define unmerged_cache() unmerged_index(&the_index) 356#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 357#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 358#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 359#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 360#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 361#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 362#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 363#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 364#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 365#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 366#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 367#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 368#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 369#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 370#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 371#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 372#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 373#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 374#endif 375 376/* 377 * Values in this enum (except those outside the 3 bit range) are part 378 * of pack file format. See Documentation/technical/pack-format.txt 379 * for more information. 380 */ 381enum object_type { 382 OBJ_BAD = -1, 383 OBJ_NONE =0, 384 OBJ_COMMIT =1, 385 OBJ_TREE =2, 386 OBJ_BLOB =3, 387 OBJ_TAG =4, 388/* 5 for future expansion */ 389 OBJ_OFS_DELTA =6, 390 OBJ_REF_DELTA =7, 391 OBJ_ANY, 392 OBJ_MAX 393}; 394 395staticinlineenum object_type object_type(unsigned int mode) 396{ 397returnS_ISDIR(mode) ? OBJ_TREE : 398S_ISGITLINK(mode) ? OBJ_COMMIT : 399 OBJ_BLOB; 400} 401 402/* Double-check local_repo_env below if you add to this list. */ 403#define GIT_DIR_ENVIRONMENT"GIT_DIR" 404#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 405#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 406#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 407#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 408#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 409#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 410#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 411#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 412#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 413#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 414#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 415#define CONFIG_ENVIRONMENT"GIT_CONFIG" 416#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 417#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 418#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 419#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 420#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 421#define GITATTRIBUTES_FILE".gitattributes" 422#define INFOATTRIBUTES_FILE"info/attributes" 423#define ATTRIBUTE_MACRO_PREFIX"[attr]" 424#define GITMODULES_FILE".gitmodules" 425#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 426#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 427#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 428#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 429#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 430#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 431#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 432#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 433#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 434#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 435#define GIT_OPTIONAL_LOCKS_ENVIRONMENT"GIT_OPTIONAL_LOCKS" 436#define GIT_TEXT_DOMAIN_DIR_ENVIRONMENT"GIT_TEXTDOMAINDIR" 437 438/* 439 * Environment variable used in handshaking the wire protocol. 440 * Contains a colon ':' separated list of keys with optional values 441 * 'key[=value]'. Presence of unknown keys and values must be 442 * ignored. 443 */ 444#define GIT_PROTOCOL_ENVIRONMENT"GIT_PROTOCOL" 445/* HTTP header used to handshake the wire protocol */ 446#define GIT_PROTOCOL_HEADER"Git-Protocol" 447 448/* 449 * This environment variable is expected to contain a boolean indicating 450 * whether we should or should not treat: 451 * 452 * GIT_DIR=foo.git git ... 453 * 454 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 455 * of this, but we use it internally to communicate to sub-processes that we 456 * are in a bare repo. If not set, defaults to true. 457 */ 458#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 459 460/* 461 * Repository-local GIT_* environment variables; these will be cleared 462 * when git spawns a sub-process that runs inside another repository. 463 * The array is NULL-terminated, which makes it easy to pass in the "env" 464 * parameter of a run-command invocation, or to do a simple walk. 465 */ 466externconst char*const local_repo_env[]; 467 468externvoidsetup_git_env(const char*git_dir); 469 470/* 471 * Returns true iff we have a configured git repository (either via 472 * setup_git_directory, or in the environment via $GIT_DIR). 473 */ 474inthave_git_dir(void); 475 476externint is_bare_repository_cfg; 477externintis_bare_repository(void); 478externintis_inside_git_dir(void); 479externchar*git_work_tree_cfg; 480externintis_inside_work_tree(void); 481externconst char*get_git_dir(void); 482externconst char*get_git_common_dir(void); 483externchar*get_object_directory(void); 484externchar*get_index_file(void); 485externchar*get_graft_file(void); 486externvoidset_git_dir(const char*path); 487externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 488externintget_common_dir(struct strbuf *sb,const char*gitdir); 489externconst char*get_git_namespace(void); 490externconst char*strip_namespace(const char*namespaced_ref); 491externconst char*get_super_prefix(void); 492externconst char*get_git_work_tree(void); 493 494/* 495 * Return true if the given path is a git directory; note that this _just_ 496 * looks at the directory itself. If you want to know whether "foo/.git" 497 * is a repository, you must feed that path, not just "foo". 498 */ 499externintis_git_directory(const char*path); 500 501/* 502 * Return 1 if the given path is the root of a git repository or 503 * submodule, else 0. Will not return 1 for bare repositories with the 504 * exception of creating a bare repository in "foo/.git" and calling 505 * is_git_repository("foo"). 506 * 507 * If we run into read errors, we err on the side of saying "yes, it is", 508 * as we usually consider sub-repos precious, and would prefer to err on the 509 * side of not disrupting or deleting them. 510 */ 511externintis_nonbare_repository_dir(struct strbuf *path); 512 513#define READ_GITFILE_ERR_STAT_FAILED 1 514#define READ_GITFILE_ERR_NOT_A_FILE 2 515#define READ_GITFILE_ERR_OPEN_FAILED 3 516#define READ_GITFILE_ERR_READ_FAILED 4 517#define READ_GITFILE_ERR_INVALID_FORMAT 5 518#define READ_GITFILE_ERR_NO_PATH 6 519#define READ_GITFILE_ERR_NOT_A_REPO 7 520#define READ_GITFILE_ERR_TOO_LARGE 8 521externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 522externconst char*read_gitfile_gently(const char*path,int*return_error_code); 523#define read_gitfile(path) read_gitfile_gently((path), NULL) 524externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 525#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 526 527externvoidset_git_work_tree(const char*tree); 528 529#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 530 531externvoidsetup_work_tree(void); 532/* 533 * Find the commondir and gitdir of the repository that contains the current 534 * working directory, without changing the working directory or other global 535 * state. The result is appended to commondir and gitdir. If the discovered 536 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 537 * both have the same result appended to the buffer. The return value is 538 * either 0 upon success and non-zero if no repository was found. 539 */ 540externintdiscover_git_directory(struct strbuf *commondir, 541struct strbuf *gitdir); 542externconst char*setup_git_directory_gently(int*); 543externconst char*setup_git_directory(void); 544externchar*prefix_path(const char*prefix,int len,const char*path); 545externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 546 547/* 548 * Concatenate "prefix" (if len is non-zero) and "path", with no 549 * connecting characters (so "prefix" should end with a "/"). 550 * Unlike prefix_path, this should be used if the named file does 551 * not have to interact with index entry; i.e. name of a random file 552 * on the filesystem. 553 * 554 * The return value is always a newly allocated string (even if the 555 * prefix was empty). 556 */ 557externchar*prefix_filename(const char*prefix,const char*path); 558 559externintcheck_filename(const char*prefix,const char*name); 560externvoidverify_filename(const char*prefix, 561const char*name, 562int diagnose_misspelt_rev); 563externvoidverify_non_filename(const char*prefix,const char*name); 564externintpath_inside_repo(const char*prefix,const char*path); 565 566#define INIT_DB_QUIET 0x0001 567#define INIT_DB_EXIST_OK 0x0002 568 569externintinit_db(const char*git_dir,const char*real_git_dir, 570const char*template_dir,unsigned int flags); 571 572externvoidsanitize_stdfds(void); 573externintdaemonize(void); 574 575#define alloc_nr(x) (((x)+16)*3/2) 576 577/* 578 * Realloc the buffer pointed at by variable 'x' so that it can hold 579 * at least 'nr' entries; the number of entries currently allocated 580 * is 'alloc', using the standard growing factor alloc_nr() macro. 581 * 582 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 583 */ 584#define ALLOC_GROW(x, nr, alloc) \ 585 do { \ 586 if ((nr) > alloc) { \ 587 if (alloc_nr(alloc) < (nr)) \ 588 alloc = (nr); \ 589 else \ 590 alloc = alloc_nr(alloc); \ 591 REALLOC_ARRAY(x, alloc); \ 592 } \ 593 } while (0) 594 595/* Initialize and use the cache information */ 596struct lock_file; 597externintread_index(struct index_state *); 598externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 599externintdo_read_index(struct index_state *istate,const char*path, 600int must_exist);/* for testting only! */ 601externintread_index_from(struct index_state *,const char*path, 602const char*gitdir); 603externintis_index_unborn(struct index_state *); 604externintread_index_unmerged(struct index_state *); 605 606/* For use with `write_locked_index()`. */ 607#define COMMIT_LOCK (1 << 0) 608#define SKIP_IF_UNCHANGED (1 << 1) 609 610/* 611 * Write the index while holding an already-taken lock. Close the lock, 612 * and if `COMMIT_LOCK` is given, commit it. 613 * 614 * Unless a split index is in use, write the index into the lockfile. 615 * 616 * With a split index, write the shared index to a temporary file, 617 * adjust its permissions and rename it into place, then write the 618 * split index to the lockfile. If the temporary file for the shared 619 * index cannot be created, fall back to the behavior described in 620 * the previous paragraph. 621 * 622 * With `COMMIT_LOCK`, the lock is always committed or rolled back. 623 * Without it, the lock is closed, but neither committed nor rolled 624 * back. 625 * 626 * If `SKIP_IF_UNCHANGED` is given and the index is unchanged, nothing 627 * is written (and the lock is rolled back if `COMMIT_LOCK` is given). 628 */ 629externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 630 631externintdiscard_index(struct index_state *); 632externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 633externintunmerged_index(const struct index_state *); 634 635/** 636 * Returns 1 if the index differs from HEAD, 0 otherwise. When on an unborn 637 * branch, returns 1 if there are entries in the index, 0 otherwise. If an 638 * strbuf is provided, the space-separated list of files that differ will be 639 * appended to it. 640 */ 641externintindex_has_changes(struct strbuf *sb); 642 643externintverify_path(const char*path); 644externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 645externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 646externvoidadjust_dirname_case(struct index_state *istate,char*name); 647externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 648 649/* 650 * Searches for an entry defined by name and namelen in the given index. 651 * If the return value is positive (including 0) it is the position of an 652 * exact match. If the return value is negative, the negated value minus 1 653 * is the position where the entry would be inserted. 654 * Example: The current index consists of these files and its stages: 655 * 656 * b#0, d#0, f#1, f#3 657 * 658 * index_name_pos(&index, "a", 1) -> -1 659 * index_name_pos(&index, "b", 1) -> 0 660 * index_name_pos(&index, "c", 1) -> -2 661 * index_name_pos(&index, "d", 1) -> 1 662 * index_name_pos(&index, "e", 1) -> -3 663 * index_name_pos(&index, "f", 1) -> -3 664 * index_name_pos(&index, "g", 1) -> -5 665 */ 666externintindex_name_pos(const struct index_state *,const char*name,int namelen); 667 668#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 669#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 670#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 671#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 672#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 673#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 674externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 675externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 676 677/* Remove entry, return true if there are more entries to go. */ 678externintremove_index_entry_at(struct index_state *,int pos); 679 680externvoidremove_marked_cache_entries(struct index_state *istate); 681externintremove_file_from_index(struct index_state *,const char*path); 682#define ADD_CACHE_VERBOSE 1 683#define ADD_CACHE_PRETEND 2 684#define ADD_CACHE_IGNORE_ERRORS 4 685#define ADD_CACHE_IGNORE_REMOVAL 8 686#define ADD_CACHE_INTENT 16 687/* 688 * These two are used to add the contents of the file at path 689 * to the index, marking the working tree up-to-date by storing 690 * the cached stat info in the resulting cache entry. A caller 691 * that has already run lstat(2) on the path can call 692 * add_to_index(), and all others can call add_file_to_index(); 693 * the latter will do necessary lstat(2) internally before 694 * calling the former. 695 */ 696externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 697externintadd_file_to_index(struct index_state *,const char*path,int flags); 698 699externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 700externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 701externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 702externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 703externintindex_name_is_other(const struct index_state *,const char*,int); 704externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 705 706/* do stat comparison even if CE_VALID is true */ 707#define CE_MATCH_IGNORE_VALID 01 708/* do not check the contents but report dirty on racily-clean entries */ 709#define CE_MATCH_RACY_IS_DIRTY 02 710/* do stat comparison even if CE_SKIP_WORKTREE is true */ 711#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 712/* ignore non-existent files during stat update */ 713#define CE_MATCH_IGNORE_MISSING 0x08 714/* enable stat refresh */ 715#define CE_MATCH_REFRESH 0x10 716/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */ 717#define CE_MATCH_IGNORE_FSMONITOR 0X20 718externintie_match_stat(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 719externintie_modified(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 720 721#define HASH_WRITE_OBJECT 1 722#define HASH_FORMAT_CHECK 2 723#define HASH_RENORMALIZE 4 724externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 725externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 726 727/* 728 * Record to sd the data from st that we use to check whether a file 729 * might have changed. 730 */ 731externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 732 733/* 734 * Return 0 if st is consistent with a file not having been changed 735 * since sd was filled. If there are differences, return a 736 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 737 * INODE_CHANGED, and DATA_CHANGED. 738 */ 739externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 740externintmatch_stat_data_racy(const struct index_state *istate, 741const struct stat_data *sd,struct stat *st); 742 743externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 744 745#define REFRESH_REALLY 0x0001/* ignore_valid */ 746#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 747#define REFRESH_QUIET 0x0004/* be quiet about it */ 748#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 749#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 750#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 751externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 752externstruct cache_entry *refresh_cache_entry(struct cache_entry *,unsigned int); 753 754/* 755 * Opportunistically update the index but do not complain if we can't. 756 * The lockfile is always committed or rolled back. 757 */ 758externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 759 760externinthold_locked_index(struct lock_file *,int); 761externvoidset_alternate_index_output(const char*); 762 763externint verify_index_checksum; 764externint verify_ce_order; 765 766/* Environment bits from configuration mechanism */ 767externint trust_executable_bit; 768externint trust_ctime; 769externint check_stat; 770externint quote_path_fully; 771externint has_symlinks; 772externint minimum_abbrev, default_abbrev; 773externint ignore_case; 774externint assume_unchanged; 775externint prefer_symlink_refs; 776externint warn_ambiguous_refs; 777externint warn_on_object_refname_ambiguity; 778externconst char*apply_default_whitespace; 779externconst char*apply_default_ignorewhitespace; 780externconst char*git_attributes_file; 781externconst char*git_hooks_path; 782externint zlib_compression_level; 783externint core_compression_level; 784externint pack_compression_level; 785externsize_t packed_git_window_size; 786externsize_t packed_git_limit; 787externsize_t delta_base_cache_limit; 788externunsigned long big_file_threshold; 789externunsigned long pack_size_limit_cfg; 790 791/* 792 * Accessors for the core.sharedrepository config which lazy-load the value 793 * from the config (if not already set). The "reset" function can be 794 * used to unset "set" or cached value, meaning that the value will be loaded 795 * fresh from the config file on the next call to get_shared_repository(). 796 */ 797voidset_shared_repository(int value); 798intget_shared_repository(void); 799voidreset_shared_repository(void); 800 801/* 802 * Do replace refs need to be checked this run? This variable is 803 * initialized to true unless --no-replace-object is used or 804 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 805 * commands that do not want replace references to be active. As an 806 * optimization it is also set to false if replace references have 807 * been sought but there were none. 808 */ 809externint check_replace_refs; 810externchar*git_replace_ref_base; 811 812externint fsync_object_files; 813externint core_preload_index; 814externint core_commit_graph; 815externint core_apply_sparse_checkout; 816externint precomposed_unicode; 817externint protect_hfs; 818externint protect_ntfs; 819externconst char*core_fsmonitor; 820 821/* 822 * Include broken refs in all ref iterations, which will 823 * generally choke dangerous operations rather than letting 824 * them silently proceed without taking the broken ref into 825 * account. 826 */ 827externint ref_paranoia; 828 829/* 830 * Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value). 831 */ 832intuse_optional_locks(void); 833 834/* 835 * The character that begins a commented line in user-editable file 836 * that is subject to stripspace. 837 */ 838externchar comment_line_char; 839externint auto_comment_line_char; 840 841/* Windows only */ 842enum hide_dotfiles_type { 843 HIDE_DOTFILES_FALSE =0, 844 HIDE_DOTFILES_TRUE, 845 HIDE_DOTFILES_DOTGITONLY 846}; 847externenum hide_dotfiles_type hide_dotfiles; 848 849enum log_refs_config { 850 LOG_REFS_UNSET = -1, 851 LOG_REFS_NONE =0, 852 LOG_REFS_NORMAL, 853 LOG_REFS_ALWAYS 854}; 855externenum log_refs_config log_all_ref_updates; 856 857enum branch_track { 858 BRANCH_TRACK_UNSPECIFIED = -1, 859 BRANCH_TRACK_NEVER =0, 860 BRANCH_TRACK_REMOTE, 861 BRANCH_TRACK_ALWAYS, 862 BRANCH_TRACK_EXPLICIT, 863 BRANCH_TRACK_OVERRIDE 864}; 865 866enum rebase_setup_type { 867 AUTOREBASE_NEVER =0, 868 AUTOREBASE_LOCAL, 869 AUTOREBASE_REMOTE, 870 AUTOREBASE_ALWAYS 871}; 872 873enum push_default_type { 874 PUSH_DEFAULT_NOTHING =0, 875 PUSH_DEFAULT_MATCHING, 876 PUSH_DEFAULT_SIMPLE, 877 PUSH_DEFAULT_UPSTREAM, 878 PUSH_DEFAULT_CURRENT, 879 PUSH_DEFAULT_UNSPECIFIED 880}; 881 882externenum branch_track git_branch_track; 883externenum rebase_setup_type autorebase; 884externenum push_default_type push_default; 885 886enum object_creation_mode { 887 OBJECT_CREATION_USES_HARDLINKS =0, 888 OBJECT_CREATION_USES_RENAMES =1 889}; 890 891externenum object_creation_mode object_creation_mode; 892 893externchar*notes_ref_name; 894 895externint grafts_replace_parents; 896 897/* 898 * GIT_REPO_VERSION is the version we write by default. The 899 * _READ variant is the highest number we know how to 900 * handle. 901 */ 902#define GIT_REPO_VERSION 0 903#define GIT_REPO_VERSION_READ 1 904externint repository_format_precious_objects; 905externchar*repository_format_partial_clone; 906externconst char*core_partial_clone_filter_default; 907 908struct repository_format { 909int version; 910int precious_objects; 911char*partial_clone;/* value of extensions.partialclone */ 912int is_bare; 913int hash_algo; 914char*work_tree; 915struct string_list unknown_extensions; 916}; 917 918/* 919 * Read the repository format characteristics from the config file "path" into 920 * "format" struct. Returns the numeric version. On error, -1 is returned, 921 * format->version is set to -1, and all other fields in the struct are 922 * undefined. 923 */ 924intread_repository_format(struct repository_format *format,const char*path); 925 926/* 927 * Verify that the repository described by repository_format is something we 928 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 929 * any errors encountered. 930 */ 931intverify_repository_format(const struct repository_format *format, 932struct strbuf *err); 933 934/* 935 * Check the repository format version in the path found in get_git_dir(), 936 * and die if it is a version we don't understand. Generally one would 937 * set_git_dir() before calling this, and use it only for "are we in a valid 938 * repo?". 939 */ 940externvoidcheck_repository_format(void); 941 942#define MTIME_CHANGED 0x0001 943#define CTIME_CHANGED 0x0002 944#define OWNER_CHANGED 0x0004 945#define MODE_CHANGED 0x0008 946#define INODE_CHANGED 0x0010 947#define DATA_CHANGED 0x0020 948#define TYPE_CHANGED 0x0040 949 950/* 951 * Return an abbreviated sha1 unique within this repository's object database. 952 * The result will be at least `len` characters long, and will be NUL 953 * terminated. 954 * 955 * The non-`_r` version returns a static buffer which remains valid until 4 956 * more calls to find_unique_abbrev are made. 957 * 958 * The `_r` variant writes to a buffer supplied by the caller, which must be at 959 * least `GIT_MAX_HEXSZ + 1` bytes. The return value is the number of bytes 960 * written (excluding the NUL terminator). 961 * 962 * Note that while this version avoids the static buffer, it is not fully 963 * reentrant, as it calls into other non-reentrant git code. 964 */ 965externconst char*find_unique_abbrev(const struct object_id *oid,int len); 966externintfind_unique_abbrev_r(char*hex,const struct object_id *oid,int len); 967 968externconst unsigned char null_sha1[GIT_MAX_RAWSZ]; 969externconst struct object_id null_oid; 970 971staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 972{ 973returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ); 974} 975 976staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 977{ 978returnhashcmp(oid1->hash, oid2->hash); 979} 980 981staticinlineintis_null_sha1(const unsigned char*sha1) 982{ 983return!hashcmp(sha1, null_sha1); 984} 985 986staticinlineintis_null_oid(const struct object_id *oid) 987{ 988return!hashcmp(oid->hash, null_sha1); 989} 990 991staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 992{ 993memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 994} 995 996staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 997{ 998hashcpy(dst->hash, src->hash); 999}10001001staticinlinestruct object_id *oiddup(const struct object_id *src)1002{1003struct object_id *dst =xmalloc(sizeof(struct object_id));1004oidcpy(dst, src);1005return dst;1006}10071008staticinlinevoidhashclr(unsigned char*hash)1009{1010memset(hash,0, GIT_SHA1_RAWSZ);1011}10121013staticinlinevoidoidclr(struct object_id *oid)1014{1015memset(oid->hash,0, GIT_MAX_RAWSZ);1016}101710181019#define EMPTY_TREE_SHA1_HEX \1020"4b825dc642cb6eb9a060e54bf8d69288fbee4904"1021#define EMPTY_TREE_SHA1_BIN_LITERAL \1022"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \1023"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"1024externconst struct object_id empty_tree_oid;1025#define EMPTY_TREE_SHA1_BIN (empty_tree_oid.hash)10261027#define EMPTY_BLOB_SHA1_HEX \1028"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"1029#define EMPTY_BLOB_SHA1_BIN_LITERAL \1030"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \1031"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"1032externconst struct object_id empty_blob_oid;10331034staticinlineintis_empty_blob_sha1(const unsigned char*sha1)1035{1036return!hashcmp(sha1, the_hash_algo->empty_blob->hash);1037}10381039staticinlineintis_empty_blob_oid(const struct object_id *oid)1040{1041return!oidcmp(oid, the_hash_algo->empty_blob);1042}10431044staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1045{1046return!hashcmp(sha1, the_hash_algo->empty_tree->hash);1047}10481049staticinlineintis_empty_tree_oid(const struct object_id *oid)1050{1051return!oidcmp(oid, the_hash_algo->empty_tree);1052}10531054/* set default permissions by passing mode arguments to open(2) */1055intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1056intgit_mkstemp_mode(char*pattern,int mode);10571058/*1059 * NOTE NOTE NOTE!!1060 *1061 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1062 * not be changed. Old repositories have core.sharedrepository written in1063 * numeric format, and therefore these values are preserved for compatibility1064 * reasons.1065 */1066enum sharedrepo {1067 PERM_UMASK =0,1068 OLD_PERM_GROUP =1,1069 OLD_PERM_EVERYBODY =2,1070 PERM_GROUP =0660,1071 PERM_EVERYBODY =06641072};1073intgit_config_perm(const char*var,const char*value);1074intadjust_shared_perm(const char*path);10751076/*1077 * Create the directory containing the named path, using care to be1078 * somewhat safe against races. Return one of the scld_error values to1079 * indicate success/failure. On error, set errno to describe the1080 * problem.1081 *1082 * SCLD_VANISHED indicates that one of the ancestor directories of the1083 * path existed at one point during the function call and then1084 * suddenly vanished, probably because another process pruned the1085 * directory while we were working. To be robust against this kind of1086 * race, callers might want to try invoking the function again when it1087 * returns SCLD_VANISHED.1088 *1089 * safe_create_leading_directories() temporarily changes path while it1090 * is working but restores it before returning.1091 * safe_create_leading_directories_const() doesn't modify path, even1092 * temporarily.1093 */1094enum scld_error {1095 SCLD_OK =0,1096 SCLD_FAILED = -1,1097 SCLD_PERMS = -2,1098 SCLD_EXISTS = -3,1099 SCLD_VANISHED = -41100};1101enum scld_error safe_create_leading_directories(char*path);1102enum scld_error safe_create_leading_directories_const(const char*path);11031104/*1105 * Callback function for raceproof_create_file(). This function is1106 * expected to do something that makes dirname(path) permanent despite1107 * the fact that other processes might be cleaning up empty1108 * directories at the same time. Usually it will create a file named1109 * path, but alternatively it could create another file in that1110 * directory, or even chdir() into that directory. The function should1111 * return 0 if the action was completed successfully. On error, it1112 * should return a nonzero result and set errno.1113 * raceproof_create_file() treats two errno values specially:1114 *1115 * - ENOENT -- dirname(path) does not exist. In this case,1116 * raceproof_create_file() tries creating dirname(path)1117 * (and any parent directories, if necessary) and calls1118 * the function again.1119 *1120 * - EISDIR -- the file already exists and is a directory. In this1121 * case, raceproof_create_file() removes the directory if1122 * it is empty (and recursively any empty directories that1123 * it contains) and calls the function again.1124 *1125 * Any other errno causes raceproof_create_file() to fail with the1126 * callback's return value and errno.1127 *1128 * Obviously, this function should be OK with being called again if it1129 * fails with ENOENT or EISDIR. In other scenarios it will not be1130 * called again.1131 */1132typedefintcreate_file_fn(const char*path,void*cb);11331134/*1135 * Create a file in dirname(path) by calling fn, creating leading1136 * directories if necessary. Retry a few times in case we are racing1137 * with another process that is trying to clean up the directory that1138 * contains path. See the documentation for create_file_fn for more1139 * details.1140 *1141 * Return the value and set the errno that resulted from the most1142 * recent call of fn. fn is always called at least once, and will be1143 * called more than once if it returns ENOENT or EISDIR.1144 */1145intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11461147intmkdir_in_gitdir(const char*path);1148externchar*expand_user_path(const char*path,int real_home);1149const char*enter_repo(const char*path,int strict);1150staticinlineintis_absolute_path(const char*path)1151{1152returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1153}1154intis_directory(const char*);1155char*strbuf_realpath(struct strbuf *resolved,const char*path,1156int die_on_error);1157const char*real_path(const char*path);1158const char*real_path_if_valid(const char*path);1159char*real_pathdup(const char*path,int die_on_error);1160const char*absolute_path(const char*path);1161char*absolute_pathdup(const char*path);1162const char*remove_leading_path(const char*in,const char*prefix);1163const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1164intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1165intnormalize_path_copy(char*dst,const char*src);1166intlongest_ancestor_length(const char*path,struct string_list *prefixes);1167char*strip_path_suffix(const char*path,const char*suffix);1168intdaemon_avoid_alias(const char*path);1169externintis_ntfs_dotgit(const char*name);11701171/*1172 * Returns true iff "str" could be confused as a command-line option when1173 * passed to a sub-program like "ssh". Note that this has nothing to do with1174 * shell-quoting, which should be handled separately; we're assuming here that1175 * the string makes it verbatim to the sub-program.1176 */1177intlooks_like_command_line_option(const char*str);11781179/**1180 * Return a newly allocated string with the evaluation of1181 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1182 * "$HOME/.config/git/$filename". Return NULL upon error.1183 */1184externchar*xdg_config_home(const char*filename);11851186/**1187 * Return a newly allocated string with the evaluation of1188 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1189 * "$HOME/.cache/git/$filename". Return NULL upon error.1190 */1191externchar*xdg_cache_home(const char*filename);11921193externvoid*read_object_file_extended(const struct object_id *oid,1194enum object_type *type,1195unsigned long*size,int lookup_replace);1196staticinlinevoid*read_object_file(const struct object_id *oid,enum object_type *type,unsigned long*size)1197{1198returnread_object_file_extended(oid, type, size,1);1199}12001201/* Read and unpack an object file into memory, write memory to an object file */1202externintoid_object_info(const struct object_id *,unsigned long*);12031204externinthash_object_file(const void*buf,unsigned long len,1205const char*type,struct object_id *oid);12061207externintwrite_object_file(const void*buf,unsigned long len,1208const char*type,struct object_id *oid);12091210externinthash_object_file_literally(const void*buf,unsigned long len,1211const char*type,struct object_id *oid,1212unsigned flags);12131214externintpretend_object_file(void*,unsigned long,enum object_type,1215struct object_id *oid);12161217externintforce_object_loose(const struct object_id *oid,time_t mtime);12181219externintgit_open_cloexec(const char*name,int flags);1220#define git_open(name) git_open_cloexec(name, O_RDONLY)1221externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1222externintparse_sha1_header(const char*hdr,unsigned long*sizep);12231224externintcheck_object_signature(const struct object_id *oid,void*buf,unsigned long size,const char*type);12251226externintfinalize_object_file(const char*tmpfile,const char*filename);12271228/*1229 * Open the loose object at path, check its hash, and return the contents,1230 * type, and size. If the object is a blob, then "contents" may return NULL,1231 * to allow streaming of large blobs.1232 *1233 * Returns 0 on success, negative on error (details may be written to stderr).1234 */1235intread_loose_object(const char*path,1236const struct object_id *expected_oid,1237enum object_type *type,1238unsigned long*size,1239void**contents);12401241/*1242 * Convenience for sha1_object_info_extended() with a NULL struct1243 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1244 * nonzero flags to also set other flags.1245 */1246externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1247staticinlineinthas_sha1_file(const unsigned char*sha1)1248{1249returnhas_sha1_file_with_flags(sha1,0);1250}12511252/* Same as the above, except for struct object_id. */1253externinthas_object_file(const struct object_id *oid);1254externinthas_object_file_with_flags(const struct object_id *oid,int flags);12551256/*1257 * Return true iff an alternate object database has a loose object1258 * with the specified name. This function does not respect replace1259 * references.1260 */1261externinthas_loose_object_nonlocal(const unsigned char*sha1);12621263externvoidassert_oid_type(const struct object_id *oid,enum object_type expect);12641265/* Helper to check and "touch" a file */1266externintcheck_and_freshen_file(const char*fn,int freshen);12671268externconst signed char hexval_table[256];1269staticinlineunsigned inthexval(unsigned char c)1270{1271return hexval_table[c];1272}12731274/*1275 * Convert two consecutive hexadecimal digits into a char. Return a1276 * negative value on error. Don't run over the end of short strings.1277 */1278staticinlineinthex2chr(const char*s)1279{1280unsigned int val =hexval(s[0]);1281return(val & ~0xf) ? val : (val <<4) |hexval(s[1]);1282}12831284/* Convert to/from hex/sha1 representation */1285#define MINIMUM_ABBREV minimum_abbrev1286#define DEFAULT_ABBREV default_abbrev12871288/* used when the code does not know or care what the default abbrev is */1289#define FALLBACK_DEFAULT_ABBREV 712901291struct object_context {1292unsigned char tree[20];1293unsigned mode;1294/*1295 * symlink_path is only used by get_tree_entry_follow_symlinks,1296 * and only for symlinks that point outside the repository.1297 */1298struct strbuf symlink_path;1299/*1300 * If GET_OID_RECORD_PATH is set, this will record path (if any)1301 * found when resolving the name. The caller is responsible for1302 * releasing the memory.1303 */1304char*path;1305};13061307#define GET_OID_QUIETLY 011308#define GET_OID_COMMIT 021309#define GET_OID_COMMITTISH 041310#define GET_OID_TREE 0101311#define GET_OID_TREEISH 0201312#define GET_OID_BLOB 0401313#define GET_OID_FOLLOW_SYMLINKS 01001314#define GET_OID_RECORD_PATH 02001315#define GET_OID_ONLY_TO_DIE 0400013161317#define GET_OID_DISAMBIGUATORS \1318 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1319 GET_OID_TREE | GET_OID_TREEISH | \1320 GET_OID_BLOB)13211322externintget_oid(const char*str,struct object_id *oid);1323externintget_oid_commit(const char*str,struct object_id *oid);1324externintget_oid_committish(const char*str,struct object_id *oid);1325externintget_oid_tree(const char*str,struct object_id *oid);1326externintget_oid_treeish(const char*str,struct object_id *oid);1327externintget_oid_blob(const char*str,struct object_id *oid);1328externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1329externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);133013311332typedefinteach_abbrev_fn(const struct object_id *oid,void*);1333externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13341335externintset_disambiguate_hint_config(const char*var,const char*value);13361337/*1338 * Try to read a SHA1 in hexadecimal format from the 40 characters1339 * starting at hex. Write the 20-byte result to sha1 in binary form.1340 * Return 0 on success. Reading stops if a NUL is encountered in the1341 * input, so it is safe to pass this function an arbitrary1342 * null-terminated string.1343 */1344externintget_sha1_hex(const char*hex,unsigned char*sha1);1345externintget_oid_hex(const char*hex,struct object_id *sha1);13461347/*1348 * Read `len` pairs of hexadecimal digits from `hex` and write the1349 * values to `binary` as `len` bytes. Return 0 on success, or -1 if1350 * the input does not consist of hex digits).1351 */1352externinthex_to_bytes(unsigned char*binary,const char*hex,size_t len);13531354/*1355 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1356 * and writes the NUL-terminated output to the buffer `out`, which must be at1357 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1358 * convenience.1359 *1360 * The non-`_r` variant returns a static buffer, but uses a ring of 41361 * buffers, making it safe to make multiple calls for a single statement, like:1362 *1363 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1364 */1365externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1366externchar*oid_to_hex_r(char*out,const struct object_id *oid);1367externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1368externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */13691370/*1371 * Parse a 40-character hexadecimal object ID starting from hex, updating the1372 * pointer specified by end when parsing stops. The resulting object ID is1373 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1374 * other invalid character. end is only updated on success; otherwise, it is1375 * unmodified.1376 */1377externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);13781379/*1380 * This reads short-hand syntax that not only evaluates to a commit1381 * object name, but also can act as if the end user spelled the name1382 * of the branch from the command line.1383 *1384 * - "@{-N}" finds the name of the Nth previous branch we were on, and1385 * places the name of the branch in the given buf and returns the1386 * number of characters parsed if successful.1387 *1388 * - "<branch>@{upstream}" finds the name of the other ref that1389 * <branch> is configured to merge with (missing <branch> defaults1390 * to the current branch), and places the name of the branch in the1391 * given buf and returns the number of characters parsed if1392 * successful.1393 *1394 * If the input is not of the accepted format, it returns a negative1395 * number to signal an error.1396 *1397 * If the input was ok but there are not N branch switches in the1398 * reflog, it returns 0.1399 *1400 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1401 * expansions: local branches ("refs/heads/"), remote branches1402 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1403 * allowed, even ones to refs outside of those namespaces.1404 */1405#define INTERPRET_BRANCH_LOCAL (1<<0)1406#define INTERPRET_BRANCH_REMOTE (1<<1)1407#define INTERPRET_BRANCH_HEAD (1<<2)1408externintinterpret_branch_name(const char*str,int len,struct strbuf *,1409unsigned allowed);1410externintget_oid_mb(const char*str,struct object_id *oid);14111412externintvalidate_headref(const char*ref);14131414externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1415externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1416externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1417externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);14181419externvoid*read_object_with_reference(const struct object_id *oid,1420const char*required_type,1421unsigned long*size,1422struct object_id *oid_ret);14231424externstruct object *peel_to_type(const char*name,int namelen,1425struct object *o,enum object_type);14261427struct date_mode {1428enum date_mode_type {1429 DATE_NORMAL =0,1430 DATE_RELATIVE,1431 DATE_SHORT,1432 DATE_ISO8601,1433 DATE_ISO8601_STRICT,1434 DATE_RFC2822,1435 DATE_STRFTIME,1436 DATE_RAW,1437 DATE_UNIX1438} type;1439const char*strftime_fmt;1440int local;1441};14421443/*1444 * Convenience helper for passing a constant type, like:1445 *1446 * show_date(t, tz, DATE_MODE(NORMAL));1447 */1448#define DATE_MODE(t) date_mode_from_type(DATE_##t)1449struct date_mode *date_mode_from_type(enum date_mode_type type);14501451const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1452voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1453struct strbuf *timebuf);1454intparse_date(const char*date,struct strbuf *out);1455intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1456intparse_expiry_date(const char*date, timestamp_t *timestamp);1457voiddatestamp(struct strbuf *out);1458#define approxidate(s) approxidate_careful((s), NULL)1459timestamp_t approxidate_careful(const char*,int*);1460timestamp_t approxidate_relative(const char*date,const struct timeval *now);1461voidparse_date_format(const char*format,struct date_mode *mode);1462intdate_overflows(timestamp_t date);14631464#define IDENT_STRICT 11465#define IDENT_NO_DATE 21466#define IDENT_NO_NAME 41467externconst char*git_author_info(int);1468externconst char*git_committer_info(int);1469externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1470externconst char*fmt_name(const char*name,const char*email);1471externconst char*ident_default_name(void);1472externconst char*ident_default_email(void);1473externconst char*git_editor(void);1474externconst char*git_pager(int stdout_is_tty);1475externintis_terminal_dumb(void);1476externintgit_ident_config(const char*,const char*,void*);1477externvoidreset_ident_date(void);14781479struct ident_split {1480const char*name_begin;1481const char*name_end;1482const char*mail_begin;1483const char*mail_end;1484const char*date_begin;1485const char*date_end;1486const char*tz_begin;1487const char*tz_end;1488};1489/*1490 * Signals an success with 0, but time part of the result may be NULL1491 * if the input lacks timestamp and zone1492 */1493externintsplit_ident_line(struct ident_split *,const char*,int);14941495/*1496 * Like show_date, but pull the timestamp and tz parameters from1497 * the ident_split. It will also sanity-check the values and produce1498 * a well-known sentinel date if they appear bogus.1499 */1500const char*show_ident_date(const struct ident_split *id,1501const struct date_mode *mode);15021503/*1504 * Compare split idents for equality or strict ordering. Note that we1505 * compare only the ident part of the line, ignoring any timestamp.1506 *1507 * Because there are two fields, we must choose one as the primary key; we1508 * currently arbitrarily pick the email.1509 */1510externintident_cmp(const struct ident_split *,const struct ident_split *);15111512struct checkout {1513struct index_state *istate;1514const char*base_dir;1515int base_dir_len;1516struct delayed_checkout *delayed_checkout;1517unsigned force:1,1518 quiet:1,1519 not_new:1,1520 refresh_cache:1;1521};1522#define CHECKOUT_INIT { NULL,"" }15231524#define TEMPORARY_FILENAME_LENGTH 251525externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1526externvoidenable_delayed_checkout(struct checkout *state);1527externintfinish_delayed_checkout(struct checkout *state);15281529struct cache_def {1530struct strbuf path;1531int flags;1532int track_flags;1533int prefix_len_stat_func;1534};1535#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1536staticinlinevoidcache_def_clear(struct cache_def *cache)1537{1538strbuf_release(&cache->path);1539}15401541externinthas_symlink_leading_path(const char*name,int len);1542externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1543externintcheck_leading_path(const char*name,int len);1544externinthas_dirs_only_path(const char*name,int len,int prefix_len);1545externvoidschedule_dir_for_removal(const char*name,int len);1546externvoidremove_scheduled_dirs(void);15471548struct pack_window {1549struct pack_window *next;1550unsigned char*base;1551 off_t offset;1552size_t len;1553unsigned int last_used;1554unsigned int inuse_cnt;1555};15561557struct pack_entry {1558 off_t offset;1559unsigned char sha1[20];1560struct packed_git *p;1561};15621563/*1564 * Create a temporary file rooted in the object database directory, or1565 * die on failure. The filename is taken from "pattern", which should have the1566 * usual "XXXXXX" trailer, and the resulting filename is written into the1567 * "template" buffer. Returns the open descriptor.1568 */1569externintodb_mkstemp(struct strbuf *temp_filename,const char*pattern);15701571/*1572 * Create a pack .keep file named "name" (which should generally be the output1573 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1574 * error.1575 */1576externintodb_pack_keep(const char*name);15771578/*1579 * Iterate over the files in the loose-object parts of the object1580 * directory "path", triggering the following callbacks:1581 *1582 * - loose_object is called for each loose object we find.1583 *1584 * - loose_cruft is called for any files that do not appear to be1585 * loose objects. Note that we only look in the loose object1586 * directories "objects/[0-9a-f]{2}/", so we will not report1587 * "objects/foobar" as cruft.1588 *1589 * - loose_subdir is called for each top-level hashed subdirectory1590 * of the object directory (e.g., "$OBJDIR/f0"). It is called1591 * after the objects in the directory are processed.1592 *1593 * Any callback that is NULL will be ignored. Callbacks returning non-zero1594 * will end the iteration.1595 *1596 * In the "buf" variant, "path" is a strbuf which will also be used as a1597 * scratch buffer, but restored to its original contents before1598 * the function returns.1599 */1600typedefinteach_loose_object_fn(const struct object_id *oid,1601const char*path,1602void*data);1603typedefinteach_loose_cruft_fn(const char*basename,1604const char*path,1605void*data);1606typedefinteach_loose_subdir_fn(unsigned int nr,1607const char*path,1608void*data);1609intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1610struct strbuf *path,1611 each_loose_object_fn obj_cb,1612 each_loose_cruft_fn cruft_cb,1613 each_loose_subdir_fn subdir_cb,1614void*data);1615intfor_each_loose_file_in_objdir(const char*path,1616 each_loose_object_fn obj_cb,1617 each_loose_cruft_fn cruft_cb,1618 each_loose_subdir_fn subdir_cb,1619void*data);1620intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1621 each_loose_object_fn obj_cb,1622 each_loose_cruft_fn cruft_cb,1623 each_loose_subdir_fn subdir_cb,1624void*data);16251626/*1627 * Iterate over loose objects in both the local1628 * repository and any alternates repositories (unless the1629 * LOCAL_ONLY flag is set).1630 */1631#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11632externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);16331634struct object_info {1635/* Request */1636enum object_type *typep;1637unsigned long*sizep;1638 off_t *disk_sizep;1639unsigned char*delta_base_sha1;1640struct strbuf *type_name;1641void**contentp;16421643/* Response */1644enum{1645 OI_CACHED,1646 OI_LOOSE,1647 OI_PACKED,1648 OI_DBCACHED1649} whence;1650union{1651/*1652 * struct {1653 * ... Nothing to expose in this case1654 * } cached;1655 * struct {1656 * ... Nothing to expose in this case1657 * } loose;1658 */1659struct{1660struct packed_git *pack;1661 off_t offset;1662unsigned int is_delta;1663} packed;1664} u;1665};16661667/*1668 * Initializer for a "struct object_info" that wants no items. You may1669 * also memset() the memory to all-zeroes.1670 */1671#define OBJECT_INFO_INIT {NULL}16721673/* Invoke lookup_replace_object() on the given hash */1674#define OBJECT_INFO_LOOKUP_REPLACE 11675/* Allow reading from a loose object file of unknown/bogus type */1676#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21677/* Do not check cached storage */1678#define OBJECT_INFO_SKIP_CACHED 41679/* Do not retry packed storage after checking packed and loose storage */1680#define OBJECT_INFO_QUICK 81681/* Do not check loose object */1682#define OBJECT_INFO_IGNORE_LOOSE 161683externintoid_object_info_extended(const struct object_id *,struct object_info *,unsigned flags);16841685/*1686 * Set this to 0 to prevent sha1_object_info_extended() from fetching missing1687 * blobs. This has a difference only if extensions.partialClone is set.1688 *1689 * Its default value is 1.1690 */1691externint fetch_if_missing;16921693/* Dumb servers support */1694externintupdate_server_info(int);16951696externconst char*get_log_output_encoding(void);1697externconst char*get_commit_output_encoding(void);16981699/*1700 * This is a hack for test programs like test-dump-untracked-cache to1701 * ensure that they do not modify the untracked cache when reading it.1702 * Do not use it otherwise!1703 */1704externint ignore_untracked_cache_config;17051706externintcommitter_ident_sufficiently_given(void);1707externintauthor_ident_sufficiently_given(void);17081709externconst char*git_commit_encoding;1710externconst char*git_log_output_encoding;1711externconst char*git_mailmap_file;1712externconst char*git_mailmap_blob;17131714/* IO helper functions */1715externvoidmaybe_flush_or_die(FILE*,const char*);1716__attribute__((format(printf,2,3)))1717externvoidfprintf_or_die(FILE*,const char*fmt, ...);17181719#define COPY_READ_ERROR (-2)1720#define COPY_WRITE_ERROR (-3)1721externintcopy_fd(int ifd,int ofd);1722externintcopy_file(const char*dst,const char*src,int mode);1723externintcopy_file_with_time(const char*dst,const char*src,int mode);17241725externvoidwrite_or_die(int fd,const void*buf,size_t count);1726externvoidfsync_or_die(int fd,const char*);17271728extern ssize_t read_in_full(int fd,void*buf,size_t count);1729extern ssize_t write_in_full(int fd,const void*buf,size_t count);1730extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17311732staticinline ssize_t write_str_in_full(int fd,const char*str)1733{1734returnwrite_in_full(fd, str,strlen(str));1735}17361737/**1738 * Open (and truncate) the file at path, write the contents of buf to it,1739 * and close it. Dies if any errors are encountered.1740 */1741externvoidwrite_file_buf(const char*path,const char*buf,size_t len);17421743/**1744 * Like write_file_buf(), but format the contents into a buffer first.1745 * Additionally, write_file() will append a newline if one is not already1746 * present, making it convenient to write text files:1747 *1748 * write_file(path, "counter: %d", ctr);1749 */1750__attribute__((format(printf,2,3)))1751externvoidwrite_file(const char*path,const char*fmt, ...);17521753/* pager.c */1754externvoidsetup_pager(void);1755externintpager_in_use(void);1756externint pager_use_color;1757externintterm_columns(void);1758externintdecimal_width(uintmax_t);1759externintcheck_pager_config(const char*cmd);1760externvoidprepare_pager_args(struct child_process *,const char*pager);17611762externconst char*editor_program;1763externconst char*askpass_program;1764externconst char*excludes_file;17651766/* base85 */1767intdecode_85(char*dst,const char*line,int linelen);1768voidencode_85(char*buf,const unsigned char*data,int bytes);17691770/* alloc.c */1771externvoid*alloc_blob_node(void);1772externvoid*alloc_tree_node(void);1773externvoid*alloc_commit_node(void);1774externvoid*alloc_tag_node(void);1775externvoid*alloc_object_node(void);1776externvoidalloc_report(void);1777externunsigned intalloc_commit_index(void);17781779/* pkt-line.c */1780voidpacket_trace_identity(const char*prog);17811782/* add */1783/*1784 * return 0 if success, 1 - if addition of a file failed and1785 * ADD_FILES_IGNORE_ERRORS was specified in flags1786 */1787intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);17881789/* diff.c */1790externint diff_auto_refresh_index;17911792/* match-trees.c */1793voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1794voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);17951796/*1797 * whitespace rules.1798 * used by both diff and apply1799 * last two digits are tab width1800 */1801#define WS_BLANK_AT_EOL 01001802#define WS_SPACE_BEFORE_TAB 02001803#define WS_INDENT_WITH_NON_TAB 04001804#define WS_CR_AT_EOL 010001805#define WS_BLANK_AT_EOF 020001806#define WS_TAB_IN_INDENT 040001807#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1808#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1809#define WS_TAB_WIDTH_MASK 0771810/* All WS_* -- when extended, adapt diff.c emit_symbol */1811#define WS_RULE_MASK 077771812externunsigned whitespace_rule_cfg;1813externunsignedwhitespace_rule(const char*);1814externunsignedparse_whitespace_rule(const char*);1815externunsignedws_check(const char*line,int len,unsigned ws_rule);1816externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1817externchar*whitespace_error_string(unsigned ws);1818externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1819externintws_blank_line(const char*line,int len,unsigned ws_rule);1820#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18211822/* ls-files */1823voidoverlay_tree_on_index(struct index_state *istate,1824const char*tree_name,const char*prefix);18251826char*alias_lookup(const char*alias);1827intsplit_cmdline(char*cmdline,const char***argv);1828/* Takes a negative value returned by split_cmdline */1829const char*split_cmdline_strerror(int cmdline_errno);18301831/* setup.c */1832struct startup_info {1833int have_repository;1834const char*prefix;1835};1836externstruct startup_info *startup_info;18371838/* merge.c */1839struct commit_list;1840inttry_merge_command(const char*strategy,size_t xopts_nr,1841const char**xopts,struct commit_list *common,1842const char*head_arg,struct commit_list *remotes);1843intcheckout_fast_forward(const struct object_id *from,1844const struct object_id *to,1845int overwrite_ignore);184618471848intsane_execvp(const char*file,char*const argv[]);18491850/*1851 * A struct to encapsulate the concept of whether a file has changed1852 * since we last checked it. This uses criteria similar to those used1853 * for the index.1854 */1855struct stat_validity {1856struct stat_data *sd;1857};18581859voidstat_validity_clear(struct stat_validity *sv);18601861/*1862 * Returns 1 if the path is a regular file (or a symlink to a regular1863 * file) and matches the saved stat_validity, 0 otherwise. A missing1864 * or inaccessible file is considered a match if the struct was just1865 * initialized, or if the previous update found an inaccessible file.1866 */1867intstat_validity_check(struct stat_validity *sv,const char*path);18681869/*1870 * Update the stat_validity from a file opened at descriptor fd. If1871 * the file is missing, inaccessible, or not a regular file, then1872 * future calls to stat_validity_check will match iff one of those1873 * conditions continues to be true.1874 */1875voidstat_validity_update(struct stat_validity *sv,int fd);18761877intversioncmp(const char*s1,const char*s2);1878voidsleep_millisec(int millisec);18791880/*1881 * Create a directory and (if share is nonzero) adjust its permissions1882 * according to the shared_repository setting. Only use this for1883 * directories under $GIT_DIR. Don't use it for working tree1884 * directories.1885 */1886voidsafe_create_dir(const char*dir,int share);18871888/*1889 * Should we print an ellipsis after an abbreviated SHA-1 value1890 * when doing diff-raw output or indicating a detached HEAD?1891 */1892externintprint_sha1_ellipsis(void);18931894#endif/* CACHE_H */