1#ifndef CACHE_H 2#define CACHE_H 3 4#include"git-compat-util.h" 5#include"strbuf.h" 6#include"hashmap.h" 7#include"mru.h" 8#include"advice.h" 9#include"gettext.h" 10#include"convert.h" 11#include"trace.h" 12#include"string-list.h" 13#include"pack-revindex.h" 14#include"hash.h" 15#include"path.h" 16#include"sha1-array.h" 17 18#ifndef platform_SHA_CTX 19/* 20 * platform's underlying implementation of SHA-1; could be OpenSSL, 21 * blk_SHA, Apple CommonCrypto, etc... Note that including 22 * SHA1_HEADER may have already defined platform_SHA_CTX for our 23 * own implementations like block-sha1 and ppc-sha1, so we list 24 * the default for OpenSSL compatible SHA-1 implementations here. 25 */ 26#define platform_SHA_CTX SHA_CTX 27#define platform_SHA1_Init SHA1_Init 28#define platform_SHA1_Update SHA1_Update 29#define platform_SHA1_Final SHA1_Final 30#endif 31 32#define git_SHA_CTX platform_SHA_CTX 33#define git_SHA1_Init platform_SHA1_Init 34#define git_SHA1_Update platform_SHA1_Update 35#define git_SHA1_Final platform_SHA1_Final 36 37#ifdef SHA1_MAX_BLOCK_SIZE 38#include"compat/sha1-chunked.h" 39#undef git_SHA1_Update 40#define git_SHA1_Update git_SHA1_Update_Chunked 41#endif 42 43#include <zlib.h> 44typedefstruct git_zstream { 45 z_stream z; 46unsigned long avail_in; 47unsigned long avail_out; 48unsigned long total_in; 49unsigned long total_out; 50unsigned char*next_in; 51unsigned char*next_out; 52} git_zstream; 53 54voidgit_inflate_init(git_zstream *); 55voidgit_inflate_init_gzip_only(git_zstream *); 56voidgit_inflate_end(git_zstream *); 57intgit_inflate(git_zstream *,int flush); 58 59voidgit_deflate_init(git_zstream *,int level); 60voidgit_deflate_init_gzip(git_zstream *,int level); 61voidgit_deflate_init_raw(git_zstream *,int level); 62voidgit_deflate_end(git_zstream *); 63intgit_deflate_abort(git_zstream *); 64intgit_deflate_end_gently(git_zstream *); 65intgit_deflate(git_zstream *,int flush); 66unsigned longgit_deflate_bound(git_zstream *,unsigned long); 67 68/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 69#define GIT_SHA1_RAWSZ 20 70#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 71 72/* The length in byte and in hex digits of the largest possible hash value. */ 73#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ 74#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ 75 76struct object_id { 77unsigned char hash[GIT_MAX_RAWSZ]; 78}; 79 80#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 81#define DTYPE(de) ((de)->d_type) 82#else 83#undef DT_UNKNOWN 84#undef DT_DIR 85#undef DT_REG 86#undef DT_LNK 87#define DT_UNKNOWN 0 88#define DT_DIR 1 89#define DT_REG 2 90#define DT_LNK 3 91#define DTYPE(de) DT_UNKNOWN 92#endif 93 94/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 95#define S_IFINVALID 0030000 96 97/* 98 * A "directory link" is a link to another git directory. 99 * 100 * The value 0160000 is not normally a valid mode, and 101 * also just happens to be S_IFDIR + S_IFLNK 102 */ 103#define S_IFGITLINK 0160000 104#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 105 106/* 107 * Some mode bits are also used internally for computations. 108 * 109 * They *must* not overlap with any valid modes, and they *must* not be emitted 110 * to outside world - i.e. appear on disk or network. In other words, it's just 111 * temporary fields, which we internally use, but they have to stay in-house. 112 * 113 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 114 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 115 */ 116 117/* used internally in tree-diff */ 118#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 119 120 121/* 122 * Intensive research over the course of many years has shown that 123 * port 9418 is totally unused by anything else. Or 124 * 125 * Your search - "port 9418" - did not match any documents. 126 * 127 * as www.google.com puts it. 128 * 129 * This port has been properly assigned for git use by IANA: 130 * git (Assigned-9418) [I06-050728-0001]. 131 * 132 * git 9418/tcp git pack transfer service 133 * git 9418/udp git pack transfer service 134 * 135 * with Linus Torvalds <torvalds@osdl.org> as the point of 136 * contact. September 2005. 137 * 138 * See http://www.iana.org/assignments/port-numbers 139 */ 140#define DEFAULT_GIT_PORT 9418 141 142/* 143 * Basic data structures for the directory cache 144 */ 145 146#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 147struct cache_header { 148uint32_t hdr_signature; 149uint32_t hdr_version; 150uint32_t hdr_entries; 151}; 152 153#define INDEX_FORMAT_LB 2 154#define INDEX_FORMAT_UB 4 155 156/* 157 * The "cache_time" is just the low 32 bits of the 158 * time. It doesn't matter if it overflows - we only 159 * check it for equality in the 32 bits we save. 160 */ 161struct cache_time { 162uint32_t sec; 163uint32_t nsec; 164}; 165 166struct stat_data { 167struct cache_time sd_ctime; 168struct cache_time sd_mtime; 169unsigned int sd_dev; 170unsigned int sd_ino; 171unsigned int sd_uid; 172unsigned int sd_gid; 173unsigned int sd_size; 174}; 175 176struct cache_entry { 177struct hashmap_entry ent; 178struct stat_data ce_stat_data; 179unsigned int ce_mode; 180unsigned int ce_flags; 181unsigned int ce_namelen; 182unsigned int index;/* for link extension */ 183struct object_id oid; 184char name[FLEX_ARRAY];/* more */ 185}; 186 187#define CE_STAGEMASK (0x3000) 188#define CE_EXTENDED (0x4000) 189#define CE_VALID (0x8000) 190#define CE_STAGESHIFT 12 191 192/* 193 * Range 0xFFFF0FFF in ce_flags is divided into 194 * two parts: in-memory flags and on-disk ones. 195 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 196 * if you want to save a new flag, add it in 197 * CE_EXTENDED_FLAGS 198 * 199 * In-memory only flags 200 */ 201#define CE_UPDATE (1 << 16) 202#define CE_REMOVE (1 << 17) 203#define CE_UPTODATE (1 << 18) 204#define CE_ADDED (1 << 19) 205 206#define CE_HASHED (1 << 20) 207#define CE_FSMONITOR_VALID (1 << 21) 208#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 209#define CE_CONFLICTED (1 << 23) 210 211#define CE_UNPACKED (1 << 24) 212#define CE_NEW_SKIP_WORKTREE (1 << 25) 213 214/* used to temporarily mark paths matched by pathspecs */ 215#define CE_MATCHED (1 << 26) 216 217#define CE_UPDATE_IN_BASE (1 << 27) 218#define CE_STRIP_NAME (1 << 28) 219 220/* 221 * Extended on-disk flags 222 */ 223#define CE_INTENT_TO_ADD (1 << 29) 224#define CE_SKIP_WORKTREE (1 << 30) 225/* CE_EXTENDED2 is for future extension */ 226#define CE_EXTENDED2 (1U << 31) 227 228#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 229 230/* 231 * Safeguard to avoid saving wrong flags: 232 * - CE_EXTENDED2 won't get saved until its semantic is known 233 * - Bits in 0x0000FFFF have been saved in ce_flags already 234 * - Bits in 0x003F0000 are currently in-memory flags 235 */ 236#if CE_EXTENDED_FLAGS & 0x803FFFFF 237#error"CE_EXTENDED_FLAGS out of range" 238#endif 239 240/* Forward structure decls */ 241struct pathspec; 242struct child_process; 243 244/* 245 * Copy the sha1 and stat state of a cache entry from one to 246 * another. But we never change the name, or the hash state! 247 */ 248staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 249const struct cache_entry *src) 250{ 251unsigned int state = dst->ce_flags & CE_HASHED; 252 253/* Don't copy hash chain and name */ 254memcpy(&dst->ce_stat_data, &src->ce_stat_data, 255offsetof(struct cache_entry, name) - 256offsetof(struct cache_entry, ce_stat_data)); 257 258/* Restore the hash state */ 259 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 260} 261 262staticinlineunsignedcreate_ce_flags(unsigned stage) 263{ 264return(stage << CE_STAGESHIFT); 265} 266 267#define ce_namelen(ce) ((ce)->ce_namelen) 268#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 269#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 270#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 271#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 272#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 273#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 274 275#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 276staticinlineunsigned intcreate_ce_mode(unsigned int mode) 277{ 278if(S_ISLNK(mode)) 279return S_IFLNK; 280if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 281return S_IFGITLINK; 282return S_IFREG |ce_permissions(mode); 283} 284staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 285unsigned int mode) 286{ 287externint trust_executable_bit, has_symlinks; 288if(!has_symlinks &&S_ISREG(mode) && 289 ce &&S_ISLNK(ce->ce_mode)) 290return ce->ce_mode; 291if(!trust_executable_bit &&S_ISREG(mode)) { 292if(ce &&S_ISREG(ce->ce_mode)) 293return ce->ce_mode; 294returncreate_ce_mode(0666); 295} 296returncreate_ce_mode(mode); 297} 298staticinlineintce_to_dtype(const struct cache_entry *ce) 299{ 300unsigned ce_mode =ntohl(ce->ce_mode); 301if(S_ISREG(ce_mode)) 302return DT_REG; 303else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 304return DT_DIR; 305else if(S_ISLNK(ce_mode)) 306return DT_LNK; 307else 308return DT_UNKNOWN; 309} 310staticinlineunsigned intcanon_mode(unsigned int mode) 311{ 312if(S_ISREG(mode)) 313return S_IFREG |ce_permissions(mode); 314if(S_ISLNK(mode)) 315return S_IFLNK; 316if(S_ISDIR(mode)) 317return S_IFDIR; 318return S_IFGITLINK; 319} 320 321#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 322 323#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 324#define CE_ENTRY_CHANGED (1 << 1) 325#define CE_ENTRY_REMOVED (1 << 2) 326#define CE_ENTRY_ADDED (1 << 3) 327#define RESOLVE_UNDO_CHANGED (1 << 4) 328#define CACHE_TREE_CHANGED (1 << 5) 329#define SPLIT_INDEX_ORDERED (1 << 6) 330#define UNTRACKED_CHANGED (1 << 7) 331#define FSMONITOR_CHANGED (1 << 8) 332 333struct split_index; 334struct untracked_cache; 335 336struct index_state { 337struct cache_entry **cache; 338unsigned int version; 339unsigned int cache_nr, cache_alloc, cache_changed; 340struct string_list *resolve_undo; 341struct cache_tree *cache_tree; 342struct split_index *split_index; 343struct cache_time timestamp; 344unsigned name_hash_initialized :1, 345 initialized :1; 346struct hashmap name_hash; 347struct hashmap dir_hash; 348unsigned char sha1[20]; 349struct untracked_cache *untracked; 350uint64_t fsmonitor_last_update; 351}; 352 353externstruct index_state the_index; 354 355/* Name hashing */ 356externinttest_lazy_init_name_hash(struct index_state *istate,int try_threaded); 357externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 358externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 359externvoidfree_name_hash(struct index_state *istate); 360 361 362#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 363#define active_cache (the_index.cache) 364#define active_nr (the_index.cache_nr) 365#define active_alloc (the_index.cache_alloc) 366#define active_cache_changed (the_index.cache_changed) 367#define active_cache_tree (the_index.cache_tree) 368 369#define read_cache() read_index(&the_index) 370#define read_cache_from(path) read_index_from(&the_index, (path)) 371#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 372#define is_cache_unborn() is_index_unborn(&the_index) 373#define read_cache_unmerged() read_index_unmerged(&the_index) 374#define discard_cache() discard_index(&the_index) 375#define unmerged_cache() unmerged_index(&the_index) 376#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 377#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 378#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 379#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 380#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 381#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 382#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 383#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 384#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 385#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 386#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 387#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 388#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 389#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 390#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 391#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 392#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 393#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 394#endif 395 396enum object_type { 397 OBJ_BAD = -1, 398 OBJ_NONE =0, 399 OBJ_COMMIT =1, 400 OBJ_TREE =2, 401 OBJ_BLOB =3, 402 OBJ_TAG =4, 403/* 5 for future expansion */ 404 OBJ_OFS_DELTA =6, 405 OBJ_REF_DELTA =7, 406 OBJ_ANY, 407 OBJ_MAX 408}; 409 410staticinlineenum object_type object_type(unsigned int mode) 411{ 412returnS_ISDIR(mode) ? OBJ_TREE : 413S_ISGITLINK(mode) ? OBJ_COMMIT : 414 OBJ_BLOB; 415} 416 417/* Double-check local_repo_env below if you add to this list. */ 418#define GIT_DIR_ENVIRONMENT"GIT_DIR" 419#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 420#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 421#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 422#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 423#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 424#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 425#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 426#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 427#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 428#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 429#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 430#define CONFIG_ENVIRONMENT"GIT_CONFIG" 431#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 432#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 433#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 434#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 435#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 436#define GITATTRIBUTES_FILE".gitattributes" 437#define INFOATTRIBUTES_FILE"info/attributes" 438#define ATTRIBUTE_MACRO_PREFIX"[attr]" 439#define GITMODULES_FILE".gitmodules" 440#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 441#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 442#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 443#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 444#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 445#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 446#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 447#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 448#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 449#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 450#define GIT_OPTIONAL_LOCKS_ENVIRONMENT"GIT_OPTIONAL_LOCKS" 451 452/* 453 * This environment variable is expected to contain a boolean indicating 454 * whether we should or should not treat: 455 * 456 * GIT_DIR=foo.git git ... 457 * 458 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 459 * of this, but we use it internally to communicate to sub-processes that we 460 * are in a bare repo. If not set, defaults to true. 461 */ 462#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 463 464/* 465 * Repository-local GIT_* environment variables; these will be cleared 466 * when git spawns a sub-process that runs inside another repository. 467 * The array is NULL-terminated, which makes it easy to pass in the "env" 468 * parameter of a run-command invocation, or to do a simple walk. 469 */ 470externconst char*const local_repo_env[]; 471 472externvoidsetup_git_env(void); 473 474/* 475 * Returns true iff we have a configured git repository (either via 476 * setup_git_directory, or in the environment via $GIT_DIR). 477 */ 478inthave_git_dir(void); 479 480externint is_bare_repository_cfg; 481externintis_bare_repository(void); 482externintis_inside_git_dir(void); 483externchar*git_work_tree_cfg; 484externintis_inside_work_tree(void); 485externconst char*get_git_dir(void); 486externconst char*get_git_common_dir(void); 487externchar*get_object_directory(void); 488externchar*get_index_file(void); 489externchar*get_graft_file(void); 490externintset_git_dir(const char*path); 491externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 492externintget_common_dir(struct strbuf *sb,const char*gitdir); 493externconst char*get_git_namespace(void); 494externconst char*strip_namespace(const char*namespaced_ref); 495externconst char*get_super_prefix(void); 496externconst char*get_git_work_tree(void); 497 498/* 499 * Return true if the given path is a git directory; note that this _just_ 500 * looks at the directory itself. If you want to know whether "foo/.git" 501 * is a repository, you must feed that path, not just "foo". 502 */ 503externintis_git_directory(const char*path); 504 505/* 506 * Return 1 if the given path is the root of a git repository or 507 * submodule, else 0. Will not return 1 for bare repositories with the 508 * exception of creating a bare repository in "foo/.git" and calling 509 * is_git_repository("foo"). 510 * 511 * If we run into read errors, we err on the side of saying "yes, it is", 512 * as we usually consider sub-repos precious, and would prefer to err on the 513 * side of not disrupting or deleting them. 514 */ 515externintis_nonbare_repository_dir(struct strbuf *path); 516 517#define READ_GITFILE_ERR_STAT_FAILED 1 518#define READ_GITFILE_ERR_NOT_A_FILE 2 519#define READ_GITFILE_ERR_OPEN_FAILED 3 520#define READ_GITFILE_ERR_READ_FAILED 4 521#define READ_GITFILE_ERR_INVALID_FORMAT 5 522#define READ_GITFILE_ERR_NO_PATH 6 523#define READ_GITFILE_ERR_NOT_A_REPO 7 524#define READ_GITFILE_ERR_TOO_LARGE 8 525externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 526externconst char*read_gitfile_gently(const char*path,int*return_error_code); 527#define read_gitfile(path) read_gitfile_gently((path), NULL) 528externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 529#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 530 531externvoidset_git_work_tree(const char*tree); 532 533#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 534 535externvoidsetup_work_tree(void); 536/* 537 * Find the commondir and gitdir of the repository that contains the current 538 * working directory, without changing the working directory or other global 539 * state. The result is appended to commondir and gitdir. If the discovered 540 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 541 * both have the same result appended to the buffer. The return value is 542 * either 0 upon success and non-zero if no repository was found. 543 */ 544externintdiscover_git_directory(struct strbuf *commondir, 545struct strbuf *gitdir); 546externconst char*setup_git_directory_gently(int*); 547externconst char*setup_git_directory(void); 548externchar*prefix_path(const char*prefix,int len,const char*path); 549externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 550 551/* 552 * Concatenate "prefix" (if len is non-zero) and "path", with no 553 * connecting characters (so "prefix" should end with a "/"). 554 * Unlike prefix_path, this should be used if the named file does 555 * not have to interact with index entry; i.e. name of a random file 556 * on the filesystem. 557 * 558 * The return value is always a newly allocated string (even if the 559 * prefix was empty). 560 */ 561externchar*prefix_filename(const char*prefix,const char*path); 562 563externintcheck_filename(const char*prefix,const char*name); 564externvoidverify_filename(const char*prefix, 565const char*name, 566int diagnose_misspelt_rev); 567externvoidverify_non_filename(const char*prefix,const char*name); 568externintpath_inside_repo(const char*prefix,const char*path); 569 570#define INIT_DB_QUIET 0x0001 571#define INIT_DB_EXIST_OK 0x0002 572 573externintinit_db(const char*git_dir,const char*real_git_dir, 574const char*template_dir,unsigned int flags); 575 576externvoidsanitize_stdfds(void); 577externintdaemonize(void); 578 579#define alloc_nr(x) (((x)+16)*3/2) 580 581/* 582 * Realloc the buffer pointed at by variable 'x' so that it can hold 583 * at least 'nr' entries; the number of entries currently allocated 584 * is 'alloc', using the standard growing factor alloc_nr() macro. 585 * 586 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 587 */ 588#define ALLOC_GROW(x, nr, alloc) \ 589 do { \ 590 if ((nr) > alloc) { \ 591 if (alloc_nr(alloc) < (nr)) \ 592 alloc = (nr); \ 593 else \ 594 alloc = alloc_nr(alloc); \ 595 REALLOC_ARRAY(x, alloc); \ 596 } \ 597 } while (0) 598 599/* Initialize and use the cache information */ 600struct lock_file; 601externintread_index(struct index_state *); 602externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 603externintdo_read_index(struct index_state *istate,const char*path, 604int must_exist);/* for testting only! */ 605externintread_index_from(struct index_state *,const char*path); 606externintis_index_unborn(struct index_state *); 607externintread_index_unmerged(struct index_state *); 608 609/* For use with `write_locked_index()`. */ 610#define COMMIT_LOCK (1 << 0) 611 612/* 613 * Write the index while holding an already-taken lock. Close the lock, 614 * and if `COMMIT_LOCK` is given, commit it. 615 * 616 * Unless a split index is in use, write the index into the lockfile. 617 * 618 * With a split index, write the shared index to a temporary file, 619 * adjust its permissions and rename it into place, then write the 620 * split index to the lockfile. If the temporary file for the shared 621 * index cannot be created, fall back to the behavior described in 622 * the previous paragraph. 623 * 624 * With `COMMIT_LOCK`, the lock is always committed or rolled back. 625 * Without it, the lock is closed, but neither committed nor rolled 626 * back. 627 */ 628externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 629 630externintdiscard_index(struct index_state *); 631externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 632externintunmerged_index(const struct index_state *); 633externintverify_path(const char*path); 634externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 635externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 636externvoidadjust_dirname_case(struct index_state *istate,char*name); 637externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 638 639/* 640 * Searches for an entry defined by name and namelen in the given index. 641 * If the return value is positive (including 0) it is the position of an 642 * exact match. If the return value is negative, the negated value minus 1 643 * is the position where the entry would be inserted. 644 * Example: The current index consists of these files and its stages: 645 * 646 * b#0, d#0, f#1, f#3 647 * 648 * index_name_pos(&index, "a", 1) -> -1 649 * index_name_pos(&index, "b", 1) -> 0 650 * index_name_pos(&index, "c", 1) -> -2 651 * index_name_pos(&index, "d", 1) -> 1 652 * index_name_pos(&index, "e", 1) -> -3 653 * index_name_pos(&index, "f", 1) -> -3 654 * index_name_pos(&index, "g", 1) -> -5 655 */ 656externintindex_name_pos(const struct index_state *,const char*name,int namelen); 657 658#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 659#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 660#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 661#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 662#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 663#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 664externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 665externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 666 667/* Remove entry, return true if there are more entries to go. */ 668externintremove_index_entry_at(struct index_state *,int pos); 669 670externvoidremove_marked_cache_entries(struct index_state *istate); 671externintremove_file_from_index(struct index_state *,const char*path); 672#define ADD_CACHE_VERBOSE 1 673#define ADD_CACHE_PRETEND 2 674#define ADD_CACHE_IGNORE_ERRORS 4 675#define ADD_CACHE_IGNORE_REMOVAL 8 676#define ADD_CACHE_INTENT 16 677/* 678 * These two are used to add the contents of the file at path 679 * to the index, marking the working tree up-to-date by storing 680 * the cached stat info in the resulting cache entry. A caller 681 * that has already run lstat(2) on the path can call 682 * add_to_index(), and all others can call add_file_to_index(); 683 * the latter will do necessary lstat(2) internally before 684 * calling the former. 685 */ 686externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 687externintadd_file_to_index(struct index_state *,const char*path,int flags); 688 689externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 690externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 691externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 692externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 693externintindex_name_is_other(const struct index_state *,const char*,int); 694externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 695 696/* do stat comparison even if CE_VALID is true */ 697#define CE_MATCH_IGNORE_VALID 01 698/* do not check the contents but report dirty on racily-clean entries */ 699#define CE_MATCH_RACY_IS_DIRTY 02 700/* do stat comparison even if CE_SKIP_WORKTREE is true */ 701#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 702/* ignore non-existent files during stat update */ 703#define CE_MATCH_IGNORE_MISSING 0x08 704/* enable stat refresh */ 705#define CE_MATCH_REFRESH 0x10 706/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */ 707#define CE_MATCH_IGNORE_FSMONITOR 0X20 708externintie_match_stat(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 709externintie_modified(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 710 711#define HASH_WRITE_OBJECT 1 712#define HASH_FORMAT_CHECK 2 713externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 714externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 715 716/* 717 * Record to sd the data from st that we use to check whether a file 718 * might have changed. 719 */ 720externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 721 722/* 723 * Return 0 if st is consistent with a file not having been changed 724 * since sd was filled. If there are differences, return a 725 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 726 * INODE_CHANGED, and DATA_CHANGED. 727 */ 728externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 729externintmatch_stat_data_racy(const struct index_state *istate, 730const struct stat_data *sd,struct stat *st); 731 732externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 733 734#define REFRESH_REALLY 0x0001/* ignore_valid */ 735#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 736#define REFRESH_QUIET 0x0004/* be quiet about it */ 737#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 738#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 739#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 740externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 741externstruct cache_entry *refresh_cache_entry(struct cache_entry *,unsigned int); 742 743/* 744 * Opportunistically update the index but do not complain if we can't. 745 * The lockfile is always committed or rolled back. 746 */ 747externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 748 749externinthold_locked_index(struct lock_file *,int); 750externvoidset_alternate_index_output(const char*); 751 752externint verify_index_checksum; 753externint verify_ce_order; 754 755/* Environment bits from configuration mechanism */ 756externint trust_executable_bit; 757externint trust_ctime; 758externint check_stat; 759externint quote_path_fully; 760externint has_symlinks; 761externint minimum_abbrev, default_abbrev; 762externint ignore_case; 763externint assume_unchanged; 764externint prefer_symlink_refs; 765externint warn_ambiguous_refs; 766externint warn_on_object_refname_ambiguity; 767externconst char*apply_default_whitespace; 768externconst char*apply_default_ignorewhitespace; 769externconst char*git_attributes_file; 770externconst char*git_hooks_path; 771externint zlib_compression_level; 772externint core_compression_level; 773externint pack_compression_level; 774externsize_t packed_git_window_size; 775externsize_t packed_git_limit; 776externsize_t delta_base_cache_limit; 777externunsigned long big_file_threshold; 778externunsigned long pack_size_limit_cfg; 779 780/* 781 * Accessors for the core.sharedrepository config which lazy-load the value 782 * from the config (if not already set). The "reset" function can be 783 * used to unset "set" or cached value, meaning that the value will be loaded 784 * fresh from the config file on the next call to get_shared_repository(). 785 */ 786voidset_shared_repository(int value); 787intget_shared_repository(void); 788voidreset_shared_repository(void); 789 790/* 791 * Do replace refs need to be checked this run? This variable is 792 * initialized to true unless --no-replace-object is used or 793 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 794 * commands that do not want replace references to be active. As an 795 * optimization it is also set to false if replace references have 796 * been sought but there were none. 797 */ 798externint check_replace_refs; 799externchar*git_replace_ref_base; 800 801externint fsync_object_files; 802externint core_preload_index; 803externint core_apply_sparse_checkout; 804externint precomposed_unicode; 805externint protect_hfs; 806externint protect_ntfs; 807externconst char*core_fsmonitor; 808 809/* 810 * Include broken refs in all ref iterations, which will 811 * generally choke dangerous operations rather than letting 812 * them silently proceed without taking the broken ref into 813 * account. 814 */ 815externint ref_paranoia; 816 817/* 818 * Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value). 819 */ 820intuse_optional_locks(void); 821 822/* 823 * The character that begins a commented line in user-editable file 824 * that is subject to stripspace. 825 */ 826externchar comment_line_char; 827externint auto_comment_line_char; 828 829/* Windows only */ 830enum hide_dotfiles_type { 831 HIDE_DOTFILES_FALSE =0, 832 HIDE_DOTFILES_TRUE, 833 HIDE_DOTFILES_DOTGITONLY 834}; 835externenum hide_dotfiles_type hide_dotfiles; 836 837enum log_refs_config { 838 LOG_REFS_UNSET = -1, 839 LOG_REFS_NONE =0, 840 LOG_REFS_NORMAL, 841 LOG_REFS_ALWAYS 842}; 843externenum log_refs_config log_all_ref_updates; 844 845enum branch_track { 846 BRANCH_TRACK_UNSPECIFIED = -1, 847 BRANCH_TRACK_NEVER =0, 848 BRANCH_TRACK_REMOTE, 849 BRANCH_TRACK_ALWAYS, 850 BRANCH_TRACK_EXPLICIT, 851 BRANCH_TRACK_OVERRIDE 852}; 853 854enum rebase_setup_type { 855 AUTOREBASE_NEVER =0, 856 AUTOREBASE_LOCAL, 857 AUTOREBASE_REMOTE, 858 AUTOREBASE_ALWAYS 859}; 860 861enum push_default_type { 862 PUSH_DEFAULT_NOTHING =0, 863 PUSH_DEFAULT_MATCHING, 864 PUSH_DEFAULT_SIMPLE, 865 PUSH_DEFAULT_UPSTREAM, 866 PUSH_DEFAULT_CURRENT, 867 PUSH_DEFAULT_UNSPECIFIED 868}; 869 870externenum branch_track git_branch_track; 871externenum rebase_setup_type autorebase; 872externenum push_default_type push_default; 873 874enum object_creation_mode { 875 OBJECT_CREATION_USES_HARDLINKS =0, 876 OBJECT_CREATION_USES_RENAMES =1 877}; 878 879externenum object_creation_mode object_creation_mode; 880 881externchar*notes_ref_name; 882 883externint grafts_replace_parents; 884 885/* 886 * GIT_REPO_VERSION is the version we write by default. The 887 * _READ variant is the highest number we know how to 888 * handle. 889 */ 890#define GIT_REPO_VERSION 0 891#define GIT_REPO_VERSION_READ 1 892externint repository_format_precious_objects; 893 894struct repository_format { 895int version; 896int precious_objects; 897int is_bare; 898char*work_tree; 899struct string_list unknown_extensions; 900}; 901 902/* 903 * Read the repository format characteristics from the config file "path" into 904 * "format" struct. Returns the numeric version. On error, -1 is returned, 905 * format->version is set to -1, and all other fields in the struct are 906 * undefined. 907 */ 908intread_repository_format(struct repository_format *format,const char*path); 909 910/* 911 * Verify that the repository described by repository_format is something we 912 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 913 * any errors encountered. 914 */ 915intverify_repository_format(const struct repository_format *format, 916struct strbuf *err); 917 918/* 919 * Check the repository format version in the path found in get_git_dir(), 920 * and die if it is a version we don't understand. Generally one would 921 * set_git_dir() before calling this, and use it only for "are we in a valid 922 * repo?". 923 */ 924externvoidcheck_repository_format(void); 925 926#define MTIME_CHANGED 0x0001 927#define CTIME_CHANGED 0x0002 928#define OWNER_CHANGED 0x0004 929#define MODE_CHANGED 0x0008 930#define INODE_CHANGED 0x0010 931#define DATA_CHANGED 0x0020 932#define TYPE_CHANGED 0x0040 933 934/* 935 * Return the name of the file in the local object database that would 936 * be used to store a loose object with the specified sha1. The 937 * return value is a pointer to a statically allocated buffer that is 938 * overwritten each time the function is called. 939 */ 940externconst char*sha1_file_name(const unsigned char*sha1); 941 942/* 943 * Return an abbreviated sha1 unique within this repository's object database. 944 * The result will be at least `len` characters long, and will be NUL 945 * terminated. 946 * 947 * The non-`_r` version returns a static buffer which remains valid until 4 948 * more calls to find_unique_abbrev are made. 949 * 950 * The `_r` variant writes to a buffer supplied by the caller, which must be at 951 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes 952 * written (excluding the NUL terminator). 953 * 954 * Note that while this version avoids the static buffer, it is not fully 955 * reentrant, as it calls into other non-reentrant git code. 956 */ 957externconst char*find_unique_abbrev(const unsigned char*sha1,int len); 958externintfind_unique_abbrev_r(char*hex,const unsigned char*sha1,int len); 959 960externconst unsigned char null_sha1[GIT_MAX_RAWSZ]; 961externconst struct object_id null_oid; 962 963staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 964{ 965returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ); 966} 967 968staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 969{ 970returnhashcmp(oid1->hash, oid2->hash); 971} 972 973staticinlineintis_null_sha1(const unsigned char*sha1) 974{ 975return!hashcmp(sha1, null_sha1); 976} 977 978staticinlineintis_null_oid(const struct object_id *oid) 979{ 980return!hashcmp(oid->hash, null_sha1); 981} 982 983staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 984{ 985memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 986} 987 988staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 989{ 990hashcpy(dst->hash, src->hash); 991} 992 993staticinlinestruct object_id *oiddup(const struct object_id *src) 994{ 995struct object_id *dst =xmalloc(sizeof(struct object_id)); 996oidcpy(dst, src); 997return dst; 998} 9991000staticinlinevoidhashclr(unsigned char*hash)1001{1002memset(hash,0, GIT_SHA1_RAWSZ);1003}10041005staticinlinevoidoidclr(struct object_id *oid)1006{1007hashclr(oid->hash);1008}100910101011#define EMPTY_TREE_SHA1_HEX \1012"4b825dc642cb6eb9a060e54bf8d69288fbee4904"1013#define EMPTY_TREE_SHA1_BIN_LITERAL \1014"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \1015"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"1016externconst struct object_id empty_tree_oid;1017#define EMPTY_TREE_SHA1_BIN (empty_tree_oid.hash)10181019#define EMPTY_BLOB_SHA1_HEX \1020"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"1021#define EMPTY_BLOB_SHA1_BIN_LITERAL \1022"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \1023"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"1024externconst struct object_id empty_blob_oid;1025#define EMPTY_BLOB_SHA1_BIN (empty_blob_oid.hash)102610271028staticinlineintis_empty_blob_sha1(const unsigned char*sha1)1029{1030return!hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);1031}10321033staticinlineintis_empty_blob_oid(const struct object_id *oid)1034{1035return!hashcmp(oid->hash, EMPTY_BLOB_SHA1_BIN);1036}10371038staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1039{1040return!hashcmp(sha1, EMPTY_TREE_SHA1_BIN);1041}10421043staticinlineintis_empty_tree_oid(const struct object_id *oid)1044{1045return!hashcmp(oid->hash, EMPTY_TREE_SHA1_BIN);1046}10471048/* set default permissions by passing mode arguments to open(2) */1049intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1050intgit_mkstemp_mode(char*pattern,int mode);10511052/*1053 * NOTE NOTE NOTE!!1054 *1055 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1056 * not be changed. Old repositories have core.sharedrepository written in1057 * numeric format, and therefore these values are preserved for compatibility1058 * reasons.1059 */1060enum sharedrepo {1061 PERM_UMASK =0,1062 OLD_PERM_GROUP =1,1063 OLD_PERM_EVERYBODY =2,1064 PERM_GROUP =0660,1065 PERM_EVERYBODY =06641066};1067intgit_config_perm(const char*var,const char*value);1068intadjust_shared_perm(const char*path);10691070/*1071 * Create the directory containing the named path, using care to be1072 * somewhat safe against races. Return one of the scld_error values to1073 * indicate success/failure. On error, set errno to describe the1074 * problem.1075 *1076 * SCLD_VANISHED indicates that one of the ancestor directories of the1077 * path existed at one point during the function call and then1078 * suddenly vanished, probably because another process pruned the1079 * directory while we were working. To be robust against this kind of1080 * race, callers might want to try invoking the function again when it1081 * returns SCLD_VANISHED.1082 *1083 * safe_create_leading_directories() temporarily changes path while it1084 * is working but restores it before returning.1085 * safe_create_leading_directories_const() doesn't modify path, even1086 * temporarily.1087 */1088enum scld_error {1089 SCLD_OK =0,1090 SCLD_FAILED = -1,1091 SCLD_PERMS = -2,1092 SCLD_EXISTS = -3,1093 SCLD_VANISHED = -41094};1095enum scld_error safe_create_leading_directories(char*path);1096enum scld_error safe_create_leading_directories_const(const char*path);10971098/*1099 * Callback function for raceproof_create_file(). This function is1100 * expected to do something that makes dirname(path) permanent despite1101 * the fact that other processes might be cleaning up empty1102 * directories at the same time. Usually it will create a file named1103 * path, but alternatively it could create another file in that1104 * directory, or even chdir() into that directory. The function should1105 * return 0 if the action was completed successfully. On error, it1106 * should return a nonzero result and set errno.1107 * raceproof_create_file() treats two errno values specially:1108 *1109 * - ENOENT -- dirname(path) does not exist. In this case,1110 * raceproof_create_file() tries creating dirname(path)1111 * (and any parent directories, if necessary) and calls1112 * the function again.1113 *1114 * - EISDIR -- the file already exists and is a directory. In this1115 * case, raceproof_create_file() removes the directory if1116 * it is empty (and recursively any empty directories that1117 * it contains) and calls the function again.1118 *1119 * Any other errno causes raceproof_create_file() to fail with the1120 * callback's return value and errno.1121 *1122 * Obviously, this function should be OK with being called again if it1123 * fails with ENOENT or EISDIR. In other scenarios it will not be1124 * called again.1125 */1126typedefintcreate_file_fn(const char*path,void*cb);11271128/*1129 * Create a file in dirname(path) by calling fn, creating leading1130 * directories if necessary. Retry a few times in case we are racing1131 * with another process that is trying to clean up the directory that1132 * contains path. See the documentation for create_file_fn for more1133 * details.1134 *1135 * Return the value and set the errno that resulted from the most1136 * recent call of fn. fn is always called at least once, and will be1137 * called more than once if it returns ENOENT or EISDIR.1138 */1139intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11401141intmkdir_in_gitdir(const char*path);1142externchar*expand_user_path(const char*path,int real_home);1143const char*enter_repo(const char*path,int strict);1144staticinlineintis_absolute_path(const char*path)1145{1146returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1147}1148intis_directory(const char*);1149char*strbuf_realpath(struct strbuf *resolved,const char*path,1150int die_on_error);1151const char*real_path(const char*path);1152const char*real_path_if_valid(const char*path);1153char*real_pathdup(const char*path,int die_on_error);1154const char*absolute_path(const char*path);1155char*absolute_pathdup(const char*path);1156const char*remove_leading_path(const char*in,const char*prefix);1157const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1158intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1159intnormalize_path_copy(char*dst,const char*src);1160intlongest_ancestor_length(const char*path,struct string_list *prefixes);1161char*strip_path_suffix(const char*path,const char*suffix);1162intdaemon_avoid_alias(const char*path);1163externintis_ntfs_dotgit(const char*name);11641165/*1166 * Returns true iff "str" could be confused as a command-line option when1167 * passed to a sub-program like "ssh". Note that this has nothing to do with1168 * shell-quoting, which should be handled separately; we're assuming here that1169 * the string makes it verbatim to the sub-program.1170 */1171intlooks_like_command_line_option(const char*str);11721173/**1174 * Return a newly allocated string with the evaluation of1175 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1176 * "$HOME/.config/git/$filename". Return NULL upon error.1177 */1178externchar*xdg_config_home(const char*filename);11791180/**1181 * Return a newly allocated string with the evaluation of1182 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1183 * "$HOME/.cache/git/$filename". Return NULL upon error.1184 */1185externchar*xdg_cache_home(const char*filename);11861187externvoid*read_sha1_file_extended(const unsigned char*sha1,1188enum object_type *type,1189unsigned long*size,int lookup_replace);1190staticinlinevoid*read_sha1_file(const unsigned char*sha1,enum object_type *type,unsigned long*size)1191{1192returnread_sha1_file_extended(sha1, type, size,1);1193}11941195/*1196 * This internal function is only declared here for the benefit of1197 * lookup_replace_object(). Please do not call it directly.1198 */1199externconst unsigned char*do_lookup_replace_object(const unsigned char*sha1);12001201/*1202 * If object sha1 should be replaced, return the replacement object's1203 * name (replaced recursively, if necessary). The return value is1204 * either sha1 or a pointer to a permanently-allocated value. When1205 * object replacement is suppressed, always return sha1.1206 */1207staticinlineconst unsigned char*lookup_replace_object(const unsigned char*sha1)1208{1209if(!check_replace_refs)1210return sha1;1211returndo_lookup_replace_object(sha1);1212}12131214/* Read and unpack a sha1 file into memory, write memory to a sha1 file */1215externintsha1_object_info(const unsigned char*,unsigned long*);1216externinthash_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*sha1);1217externintwrite_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*return_sha1);1218externinthash_sha1_file_literally(const void*buf,unsigned long len,const char*type,struct object_id *oid,unsigned flags);1219externintpretend_sha1_file(void*,unsigned long,enum object_type,unsigned char*);1220externintforce_object_loose(const unsigned char*sha1,time_t mtime);1221externintgit_open_cloexec(const char*name,int flags);1222#define git_open(name) git_open_cloexec(name, O_RDONLY)1223externvoid*map_sha1_file(const unsigned char*sha1,unsigned long*size);1224externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1225externintparse_sha1_header(const char*hdr,unsigned long*sizep);12261227externintcheck_sha1_signature(const unsigned char*sha1,void*buf,unsigned long size,const char*type);12281229externintfinalize_object_file(const char*tmpfile,const char*filename);12301231/*1232 * Open the loose object at path, check its sha1, and return the contents,1233 * type, and size. If the object is a blob, then "contents" may return NULL,1234 * to allow streaming of large blobs.1235 *1236 * Returns 0 on success, negative on error (details may be written to stderr).1237 */1238intread_loose_object(const char*path,1239const unsigned char*expected_sha1,1240enum object_type *type,1241unsigned long*size,1242void**contents);12431244/*1245 * Convenience for sha1_object_info_extended() with a NULL struct1246 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1247 * nonzero flags to also set other flags.1248 */1249externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1250staticinlineinthas_sha1_file(const unsigned char*sha1)1251{1252returnhas_sha1_file_with_flags(sha1,0);1253}12541255/* Same as the above, except for struct object_id. */1256externinthas_object_file(const struct object_id *oid);1257externinthas_object_file_with_flags(const struct object_id *oid,int flags);12581259/*1260 * Return true iff an alternate object database has a loose object1261 * with the specified name. This function does not respect replace1262 * references.1263 */1264externinthas_loose_object_nonlocal(const unsigned char*sha1);12651266externvoidassert_sha1_type(const unsigned char*sha1,enum object_type expect);12671268/* Helper to check and "touch" a file */1269externintcheck_and_freshen_file(const char*fn,int freshen);12701271externconst signed char hexval_table[256];1272staticinlineunsigned inthexval(unsigned char c)1273{1274return hexval_table[c];1275}12761277/*1278 * Convert two consecutive hexadecimal digits into a char. Return a1279 * negative value on error. Don't run over the end of short strings.1280 */1281staticinlineinthex2chr(const char*s)1282{1283unsigned int val =hexval(s[0]);1284return(val & ~0xf) ? val : (val <<4) |hexval(s[1]);1285}12861287/* Convert to/from hex/sha1 representation */1288#define MINIMUM_ABBREV minimum_abbrev1289#define DEFAULT_ABBREV default_abbrev12901291/* used when the code does not know or care what the default abbrev is */1292#define FALLBACK_DEFAULT_ABBREV 712931294struct object_context {1295unsigned char tree[20];1296unsigned mode;1297/*1298 * symlink_path is only used by get_tree_entry_follow_symlinks,1299 * and only for symlinks that point outside the repository.1300 */1301struct strbuf symlink_path;1302/*1303 * If GET_OID_RECORD_PATH is set, this will record path (if any)1304 * found when resolving the name. The caller is responsible for1305 * releasing the memory.1306 */1307char*path;1308};13091310#define GET_OID_QUIETLY 011311#define GET_OID_COMMIT 021312#define GET_OID_COMMITTISH 041313#define GET_OID_TREE 0101314#define GET_OID_TREEISH 0201315#define GET_OID_BLOB 0401316#define GET_OID_FOLLOW_SYMLINKS 01001317#define GET_OID_RECORD_PATH 02001318#define GET_OID_ONLY_TO_DIE 0400013191320#define GET_OID_DISAMBIGUATORS \1321 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1322 GET_OID_TREE | GET_OID_TREEISH | \1323 GET_OID_BLOB)13241325externintget_oid(const char*str,struct object_id *oid);1326externintget_oid_commit(const char*str,struct object_id *oid);1327externintget_oid_committish(const char*str,struct object_id *oid);1328externintget_oid_tree(const char*str,struct object_id *oid);1329externintget_oid_treeish(const char*str,struct object_id *oid);1330externintget_oid_blob(const char*str,struct object_id *oid);1331externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1332externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);133313341335typedefinteach_abbrev_fn(const struct object_id *oid,void*);1336externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13371338externintset_disambiguate_hint_config(const char*var,const char*value);13391340/*1341 * Try to read a SHA1 in hexadecimal format from the 40 characters1342 * starting at hex. Write the 20-byte result to sha1 in binary form.1343 * Return 0 on success. Reading stops if a NUL is encountered in the1344 * input, so it is safe to pass this function an arbitrary1345 * null-terminated string.1346 */1347externintget_sha1_hex(const char*hex,unsigned char*sha1);1348externintget_oid_hex(const char*hex,struct object_id *sha1);13491350/*1351 * Read `len` pairs of hexadecimal digits from `hex` and write the1352 * values to `binary` as `len` bytes. Return 0 on success, or -1 if1353 * the input does not consist of hex digits).1354 */1355externinthex_to_bytes(unsigned char*binary,const char*hex,size_t len);13561357/*1358 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1359 * and writes the NUL-terminated output to the buffer `out`, which must be at1360 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1361 * convenience.1362 *1363 * The non-`_r` variant returns a static buffer, but uses a ring of 41364 * buffers, making it safe to make multiple calls for a single statement, like:1365 *1366 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1367 */1368externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1369externchar*oid_to_hex_r(char*out,const struct object_id *oid);1370externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1371externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */13721373/*1374 * Parse a 40-character hexadecimal object ID starting from hex, updating the1375 * pointer specified by end when parsing stops. The resulting object ID is1376 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1377 * other invalid character. end is only updated on success; otherwise, it is1378 * unmodified.1379 */1380externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);13811382/*1383 * This reads short-hand syntax that not only evaluates to a commit1384 * object name, but also can act as if the end user spelled the name1385 * of the branch from the command line.1386 *1387 * - "@{-N}" finds the name of the Nth previous branch we were on, and1388 * places the name of the branch in the given buf and returns the1389 * number of characters parsed if successful.1390 *1391 * - "<branch>@{upstream}" finds the name of the other ref that1392 * <branch> is configured to merge with (missing <branch> defaults1393 * to the current branch), and places the name of the branch in the1394 * given buf and returns the number of characters parsed if1395 * successful.1396 *1397 * If the input is not of the accepted format, it returns a negative1398 * number to signal an error.1399 *1400 * If the input was ok but there are not N branch switches in the1401 * reflog, it returns 0.1402 *1403 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1404 * expansions: local branches ("refs/heads/"), remote branches1405 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1406 * allowed, even ones to refs outside of those namespaces.1407 */1408#define INTERPRET_BRANCH_LOCAL (1<<0)1409#define INTERPRET_BRANCH_REMOTE (1<<1)1410#define INTERPRET_BRANCH_HEAD (1<<2)1411externintinterpret_branch_name(const char*str,int len,struct strbuf *,1412unsigned allowed);1413externintget_oid_mb(const char*str,struct object_id *oid);14141415externintvalidate_headref(const char*ref);14161417externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1418externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1419externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1420externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);14211422externvoid*read_object_with_reference(const unsigned char*sha1,1423const char*required_type,1424unsigned long*size,1425unsigned char*sha1_ret);14261427externstruct object *peel_to_type(const char*name,int namelen,1428struct object *o,enum object_type);14291430struct date_mode {1431enum date_mode_type {1432 DATE_NORMAL =0,1433 DATE_RELATIVE,1434 DATE_SHORT,1435 DATE_ISO8601,1436 DATE_ISO8601_STRICT,1437 DATE_RFC2822,1438 DATE_STRFTIME,1439 DATE_RAW,1440 DATE_UNIX1441} type;1442const char*strftime_fmt;1443int local;1444};14451446/*1447 * Convenience helper for passing a constant type, like:1448 *1449 * show_date(t, tz, DATE_MODE(NORMAL));1450 */1451#define DATE_MODE(t) date_mode_from_type(DATE_##t)1452struct date_mode *date_mode_from_type(enum date_mode_type type);14531454const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1455voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1456struct strbuf *timebuf);1457intparse_date(const char*date,struct strbuf *out);1458intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1459intparse_expiry_date(const char*date, timestamp_t *timestamp);1460voiddatestamp(struct strbuf *out);1461#define approxidate(s) approxidate_careful((s), NULL)1462timestamp_t approxidate_careful(const char*,int*);1463timestamp_t approxidate_relative(const char*date,const struct timeval *now);1464voidparse_date_format(const char*format,struct date_mode *mode);1465intdate_overflows(timestamp_t date);14661467#define IDENT_STRICT 11468#define IDENT_NO_DATE 21469#define IDENT_NO_NAME 41470externconst char*git_author_info(int);1471externconst char*git_committer_info(int);1472externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1473externconst char*fmt_name(const char*name,const char*email);1474externconst char*ident_default_name(void);1475externconst char*ident_default_email(void);1476externconst char*git_editor(void);1477externconst char*git_pager(int stdout_is_tty);1478externintgit_ident_config(const char*,const char*,void*);1479externvoidreset_ident_date(void);14801481struct ident_split {1482const char*name_begin;1483const char*name_end;1484const char*mail_begin;1485const char*mail_end;1486const char*date_begin;1487const char*date_end;1488const char*tz_begin;1489const char*tz_end;1490};1491/*1492 * Signals an success with 0, but time part of the result may be NULL1493 * if the input lacks timestamp and zone1494 */1495externintsplit_ident_line(struct ident_split *,const char*,int);14961497/*1498 * Like show_date, but pull the timestamp and tz parameters from1499 * the ident_split. It will also sanity-check the values and produce1500 * a well-known sentinel date if they appear bogus.1501 */1502const char*show_ident_date(const struct ident_split *id,1503const struct date_mode *mode);15041505/*1506 * Compare split idents for equality or strict ordering. Note that we1507 * compare only the ident part of the line, ignoring any timestamp.1508 *1509 * Because there are two fields, we must choose one as the primary key; we1510 * currently arbitrarily pick the email.1511 */1512externintident_cmp(const struct ident_split *,const struct ident_split *);15131514struct checkout {1515struct index_state *istate;1516const char*base_dir;1517int base_dir_len;1518struct delayed_checkout *delayed_checkout;1519unsigned force:1,1520 quiet:1,1521 not_new:1,1522 refresh_cache:1;1523};1524#define CHECKOUT_INIT { NULL,"" }15251526#define TEMPORARY_FILENAME_LENGTH 251527externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1528externvoidenable_delayed_checkout(struct checkout *state);1529externintfinish_delayed_checkout(struct checkout *state);15301531struct cache_def {1532struct strbuf path;1533int flags;1534int track_flags;1535int prefix_len_stat_func;1536};1537#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1538staticinlinevoidcache_def_clear(struct cache_def *cache)1539{1540strbuf_release(&cache->path);1541}15421543externinthas_symlink_leading_path(const char*name,int len);1544externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1545externintcheck_leading_path(const char*name,int len);1546externinthas_dirs_only_path(const char*name,int len,int prefix_len);1547externvoidschedule_dir_for_removal(const char*name,int len);1548externvoidremove_scheduled_dirs(void);15491550externstruct alternate_object_database {1551struct alternate_object_database *next;15521553/* see alt_scratch_buf() */1554struct strbuf scratch;1555size_t base_len;15561557/*1558 * Used to store the results of readdir(3) calls when searching1559 * for unique abbreviated hashes. This cache is never1560 * invalidated, thus it's racy and not necessarily accurate.1561 * That's fine for its purpose; don't use it for tasks requiring1562 * greater accuracy!1563 */1564char loose_objects_subdir_seen[256];1565struct oid_array loose_objects_cache;15661567char path[FLEX_ARRAY];1568} *alt_odb_list;1569externvoidprepare_alt_odb(void);1570externchar*compute_alternate_path(const char*path,struct strbuf *err);1571typedefintalt_odb_fn(struct alternate_object_database *,void*);1572externintforeach_alt_odb(alt_odb_fn,void*);15731574/*1575 * Allocate a "struct alternate_object_database" but do _not_ actually1576 * add it to the list of alternates.1577 */1578struct alternate_object_database *alloc_alt_odb(const char*dir);15791580/*1581 * Add the directory to the on-disk alternates file; the new entry will also1582 * take effect in the current process.1583 */1584externvoidadd_to_alternates_file(const char*dir);15851586/*1587 * Add the directory to the in-memory list of alternates (along with any1588 * recursive alternates it points to), but do not modify the on-disk alternates1589 * file.1590 */1591externvoidadd_to_alternates_memory(const char*dir);15921593/*1594 * Returns a scratch strbuf pre-filled with the alternate object directory,1595 * including a trailing slash, which can be used to access paths in the1596 * alternate. Always use this over direct access to alt->scratch, as it1597 * cleans up any previous use of the scratch buffer.1598 */1599externstruct strbuf *alt_scratch_buf(struct alternate_object_database *alt);16001601struct pack_window {1602struct pack_window *next;1603unsigned char*base;1604 off_t offset;1605size_t len;1606unsigned int last_used;1607unsigned int inuse_cnt;1608};16091610externstruct packed_git {1611struct packed_git *next;1612struct pack_window *windows;1613 off_t pack_size;1614const void*index_data;1615size_t index_size;1616uint32_t num_objects;1617uint32_t num_bad_objects;1618unsigned char*bad_object_sha1;1619int index_version;1620time_t mtime;1621int pack_fd;1622unsigned pack_local:1,1623 pack_keep:1,1624 freshened:1,1625 do_not_close:1;1626unsigned char sha1[20];1627struct revindex_entry *revindex;1628/* something like ".git/objects/pack/xxxxx.pack" */1629char pack_name[FLEX_ARRAY];/* more */1630} *packed_git;16311632/*1633 * A most-recently-used ordered version of the packed_git list, which can1634 * be iterated instead of packed_git (and marked via mru_mark).1635 */1636externstruct mru packed_git_mru;16371638struct pack_entry {1639 off_t offset;1640unsigned char sha1[20];1641struct packed_git *p;1642};16431644/*1645 * Create a temporary file rooted in the object database directory, or1646 * die on failure. The filename is taken from "pattern", which should have the1647 * usual "XXXXXX" trailer, and the resulting filename is written into the1648 * "template" buffer. Returns the open descriptor.1649 */1650externintodb_mkstemp(struct strbuf *template,const char*pattern);16511652/*1653 * Create a pack .keep file named "name" (which should generally be the output1654 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1655 * error.1656 */1657externintodb_pack_keep(const char*name);16581659/*1660 * Iterate over the files in the loose-object parts of the object1661 * directory "path", triggering the following callbacks:1662 *1663 * - loose_object is called for each loose object we find.1664 *1665 * - loose_cruft is called for any files that do not appear to be1666 * loose objects. Note that we only look in the loose object1667 * directories "objects/[0-9a-f]{2}/", so we will not report1668 * "objects/foobar" as cruft.1669 *1670 * - loose_subdir is called for each top-level hashed subdirectory1671 * of the object directory (e.g., "$OBJDIR/f0"). It is called1672 * after the objects in the directory are processed.1673 *1674 * Any callback that is NULL will be ignored. Callbacks returning non-zero1675 * will end the iteration.1676 *1677 * In the "buf" variant, "path" is a strbuf which will also be used as a1678 * scratch buffer, but restored to its original contents before1679 * the function returns.1680 */1681typedefinteach_loose_object_fn(const struct object_id *oid,1682const char*path,1683void*data);1684typedefinteach_loose_cruft_fn(const char*basename,1685const char*path,1686void*data);1687typedefinteach_loose_subdir_fn(unsigned int nr,1688const char*path,1689void*data);1690intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1691struct strbuf *path,1692 each_loose_object_fn obj_cb,1693 each_loose_cruft_fn cruft_cb,1694 each_loose_subdir_fn subdir_cb,1695void*data);1696intfor_each_loose_file_in_objdir(const char*path,1697 each_loose_object_fn obj_cb,1698 each_loose_cruft_fn cruft_cb,1699 each_loose_subdir_fn subdir_cb,1700void*data);1701intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1702 each_loose_object_fn obj_cb,1703 each_loose_cruft_fn cruft_cb,1704 each_loose_subdir_fn subdir_cb,1705void*data);17061707/*1708 * Iterate over loose objects in both the local1709 * repository and any alternates repositories (unless the1710 * LOCAL_ONLY flag is set).1711 */1712#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11713externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);17141715struct object_info {1716/* Request */1717enum object_type *typep;1718unsigned long*sizep;1719 off_t *disk_sizep;1720unsigned char*delta_base_sha1;1721struct strbuf *typename;1722void**contentp;17231724/* Response */1725enum{1726 OI_CACHED,1727 OI_LOOSE,1728 OI_PACKED,1729 OI_DBCACHED1730} whence;1731union{1732/*1733 * struct {1734 * ... Nothing to expose in this case1735 * } cached;1736 * struct {1737 * ... Nothing to expose in this case1738 * } loose;1739 */1740struct{1741struct packed_git *pack;1742 off_t offset;1743unsigned int is_delta;1744} packed;1745} u;1746};17471748/*1749 * Initializer for a "struct object_info" that wants no items. You may1750 * also memset() the memory to all-zeroes.1751 */1752#define OBJECT_INFO_INIT {NULL}17531754/* Invoke lookup_replace_object() on the given hash */1755#define OBJECT_INFO_LOOKUP_REPLACE 11756/* Allow reading from a loose object file of unknown/bogus type */1757#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21758/* Do not check cached storage */1759#define OBJECT_INFO_SKIP_CACHED 41760/* Do not retry packed storage after checking packed and loose storage */1761#define OBJECT_INFO_QUICK 81762externintsha1_object_info_extended(const unsigned char*,struct object_info *,unsigned flags);17631764/* Dumb servers support */1765externintupdate_server_info(int);17661767externconst char*get_log_output_encoding(void);1768externconst char*get_commit_output_encoding(void);17691770/*1771 * This is a hack for test programs like test-dump-untracked-cache to1772 * ensure that they do not modify the untracked cache when reading it.1773 * Do not use it otherwise!1774 */1775externint ignore_untracked_cache_config;17761777externintcommitter_ident_sufficiently_given(void);1778externintauthor_ident_sufficiently_given(void);17791780externconst char*git_commit_encoding;1781externconst char*git_log_output_encoding;1782externconst char*git_mailmap_file;1783externconst char*git_mailmap_blob;17841785/* IO helper functions */1786externvoidmaybe_flush_or_die(FILE*,const char*);1787__attribute__((format(printf,2,3)))1788externvoidfprintf_or_die(FILE*,const char*fmt, ...);17891790#define COPY_READ_ERROR (-2)1791#define COPY_WRITE_ERROR (-3)1792externintcopy_fd(int ifd,int ofd);1793externintcopy_file(const char*dst,const char*src,int mode);1794externintcopy_file_with_time(const char*dst,const char*src,int mode);17951796externvoidwrite_or_die(int fd,const void*buf,size_t count);1797externvoidfsync_or_die(int fd,const char*);17981799extern ssize_t read_in_full(int fd,void*buf,size_t count);1800extern ssize_t write_in_full(int fd,const void*buf,size_t count);1801extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);18021803staticinline ssize_t write_str_in_full(int fd,const char*str)1804{1805returnwrite_in_full(fd, str,strlen(str));1806}18071808/**1809 * Open (and truncate) the file at path, write the contents of buf to it,1810 * and close it. Dies if any errors are encountered.1811 */1812externvoidwrite_file_buf(const char*path,const char*buf,size_t len);18131814/**1815 * Like write_file_buf(), but format the contents into a buffer first.1816 * Additionally, write_file() will append a newline if one is not already1817 * present, making it convenient to write text files:1818 *1819 * write_file(path, "counter: %d", ctr);1820 */1821__attribute__((format(printf,2,3)))1822externvoidwrite_file(const char*path,const char*fmt, ...);18231824/* pager.c */1825externvoidsetup_pager(void);1826externintpager_in_use(void);1827externint pager_use_color;1828externintterm_columns(void);1829externintdecimal_width(uintmax_t);1830externintcheck_pager_config(const char*cmd);1831externvoidprepare_pager_args(struct child_process *,const char*pager);18321833externconst char*editor_program;1834externconst char*askpass_program;1835externconst char*excludes_file;18361837/* base85 */1838intdecode_85(char*dst,const char*line,int linelen);1839voidencode_85(char*buf,const unsigned char*data,int bytes);18401841/* alloc.c */1842externvoid*alloc_blob_node(void);1843externvoid*alloc_tree_node(void);1844externvoid*alloc_commit_node(void);1845externvoid*alloc_tag_node(void);1846externvoid*alloc_object_node(void);1847externvoidalloc_report(void);1848externunsigned intalloc_commit_index(void);18491850/* pkt-line.c */1851voidpacket_trace_identity(const char*prog);18521853/* add */1854/*1855 * return 0 if success, 1 - if addition of a file failed and1856 * ADD_FILES_IGNORE_ERRORS was specified in flags1857 */1858intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);18591860/* diff.c */1861externint diff_auto_refresh_index;18621863/* match-trees.c */1864voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1865voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);18661867/*1868 * whitespace rules.1869 * used by both diff and apply1870 * last two digits are tab width1871 */1872#define WS_BLANK_AT_EOL 01001873#define WS_SPACE_BEFORE_TAB 02001874#define WS_INDENT_WITH_NON_TAB 04001875#define WS_CR_AT_EOL 010001876#define WS_BLANK_AT_EOF 020001877#define WS_TAB_IN_INDENT 040001878#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1879#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1880#define WS_TAB_WIDTH_MASK 0771881/* All WS_* -- when extended, adapt diff.c emit_symbol */1882#define WS_RULE_MASK 077771883externunsigned whitespace_rule_cfg;1884externunsignedwhitespace_rule(const char*);1885externunsignedparse_whitespace_rule(const char*);1886externunsignedws_check(const char*line,int len,unsigned ws_rule);1887externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1888externchar*whitespace_error_string(unsigned ws);1889externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1890externintws_blank_line(const char*line,int len,unsigned ws_rule);1891#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18921893/* ls-files */1894voidoverlay_tree_on_index(struct index_state *istate,1895const char*tree_name,const char*prefix);18961897char*alias_lookup(const char*alias);1898intsplit_cmdline(char*cmdline,const char***argv);1899/* Takes a negative value returned by split_cmdline */1900const char*split_cmdline_strerror(int cmdline_errno);19011902/* setup.c */1903struct startup_info {1904int have_repository;1905const char*prefix;1906};1907externstruct startup_info *startup_info;19081909/* merge.c */1910struct commit_list;1911inttry_merge_command(const char*strategy,size_t xopts_nr,1912const char**xopts,struct commit_list *common,1913const char*head_arg,struct commit_list *remotes);1914intcheckout_fast_forward(const struct object_id *from,1915const struct object_id *to,1916int overwrite_ignore);191719181919intsane_execvp(const char*file,char*const argv[]);19201921/*1922 * A struct to encapsulate the concept of whether a file has changed1923 * since we last checked it. This uses criteria similar to those used1924 * for the index.1925 */1926struct stat_validity {1927struct stat_data *sd;1928};19291930voidstat_validity_clear(struct stat_validity *sv);19311932/*1933 * Returns 1 if the path is a regular file (or a symlink to a regular1934 * file) and matches the saved stat_validity, 0 otherwise. A missing1935 * or inaccessible file is considered a match if the struct was just1936 * initialized, or if the previous update found an inaccessible file.1937 */1938intstat_validity_check(struct stat_validity *sv,const char*path);19391940/*1941 * Update the stat_validity from a file opened at descriptor fd. If1942 * the file is missing, inaccessible, or not a regular file, then1943 * future calls to stat_validity_check will match iff one of those1944 * conditions continues to be true.1945 */1946voidstat_validity_update(struct stat_validity *sv,int fd);19471948intversioncmp(const char*s1,const char*s2);1949voidsleep_millisec(int millisec);19501951/*1952 * Create a directory and (if share is nonzero) adjust its permissions1953 * according to the shared_repository setting. Only use this for1954 * directories under $GIT_DIR. Don't use it for working tree1955 * directories.1956 */1957voidsafe_create_dir(const char*dir,int share);19581959#endif/* CACHE_H */