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"advice.h" 8#include"gettext.h" 9#include"convert.h" 10#include"trace.h" 11#include"string-list.h" 12#include"pack-revindex.h" 13#include"hash.h" 14#include"path.h" 15#include"sha1-array.h" 16 17#ifndef platform_SHA_CTX 18/* 19 * platform's underlying implementation of SHA-1; could be OpenSSL, 20 * blk_SHA, Apple CommonCrypto, etc... Note that including 21 * SHA1_HEADER may have already defined platform_SHA_CTX for our 22 * own implementations like block-sha1 and ppc-sha1, so we list 23 * the default for OpenSSL compatible SHA-1 implementations here. 24 */ 25#define platform_SHA_CTX SHA_CTX 26#define platform_SHA1_Init SHA1_Init 27#define platform_SHA1_Update SHA1_Update 28#define platform_SHA1_Final SHA1_Final 29#endif 30 31#define git_SHA_CTX platform_SHA_CTX 32#define git_SHA1_Init platform_SHA1_Init 33#define git_SHA1_Update platform_SHA1_Update 34#define git_SHA1_Final platform_SHA1_Final 35 36#ifdef SHA1_MAX_BLOCK_SIZE 37#include"compat/sha1-chunked.h" 38#undef git_SHA1_Update 39#define git_SHA1_Update git_SHA1_Update_Chunked 40#endif 41 42#include <zlib.h> 43typedefstruct git_zstream { 44 z_stream z; 45unsigned long avail_in; 46unsigned long avail_out; 47unsigned long total_in; 48unsigned long total_out; 49unsigned char*next_in; 50unsigned char*next_out; 51} git_zstream; 52 53voidgit_inflate_init(git_zstream *); 54voidgit_inflate_init_gzip_only(git_zstream *); 55voidgit_inflate_end(git_zstream *); 56intgit_inflate(git_zstream *,int flush); 57 58voidgit_deflate_init(git_zstream *,int level); 59voidgit_deflate_init_gzip(git_zstream *,int level); 60voidgit_deflate_init_raw(git_zstream *,int level); 61voidgit_deflate_end(git_zstream *); 62intgit_deflate_abort(git_zstream *); 63intgit_deflate_end_gently(git_zstream *); 64intgit_deflate(git_zstream *,int flush); 65unsigned longgit_deflate_bound(git_zstream *,unsigned long); 66 67/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 68#define GIT_SHA1_RAWSZ 20 69#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 70 71/* The length in byte and in hex digits of the largest possible hash value. */ 72#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ 73#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ 74 75struct object_id { 76unsigned char hash[GIT_MAX_RAWSZ]; 77}; 78 79#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 80#define DTYPE(de) ((de)->d_type) 81#else 82#undef DT_UNKNOWN 83#undef DT_DIR 84#undef DT_REG 85#undef DT_LNK 86#define DT_UNKNOWN 0 87#define DT_DIR 1 88#define DT_REG 2 89#define DT_LNK 3 90#define DTYPE(de) DT_UNKNOWN 91#endif 92 93/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 94#define S_IFINVALID 0030000 95 96/* 97 * A "directory link" is a link to another git directory. 98 * 99 * The value 0160000 is not normally a valid mode, and 100 * also just happens to be S_IFDIR + S_IFLNK 101 */ 102#define S_IFGITLINK 0160000 103#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 104 105/* 106 * Some mode bits are also used internally for computations. 107 * 108 * They *must* not overlap with any valid modes, and they *must* not be emitted 109 * to outside world - i.e. appear on disk or network. In other words, it's just 110 * temporary fields, which we internally use, but they have to stay in-house. 111 * 112 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 113 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 114 */ 115 116/* used internally in tree-diff */ 117#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 118 119 120/* 121 * Intensive research over the course of many years has shown that 122 * port 9418 is totally unused by anything else. Or 123 * 124 * Your search - "port 9418" - did not match any documents. 125 * 126 * as www.google.com puts it. 127 * 128 * This port has been properly assigned for git use by IANA: 129 * git (Assigned-9418) [I06-050728-0001]. 130 * 131 * git 9418/tcp git pack transfer service 132 * git 9418/udp git pack transfer service 133 * 134 * with Linus Torvalds <torvalds@osdl.org> as the point of 135 * contact. September 2005. 136 * 137 * See http://www.iana.org/assignments/port-numbers 138 */ 139#define DEFAULT_GIT_PORT 9418 140 141/* 142 * Basic data structures for the directory cache 143 */ 144 145#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 146struct cache_header { 147uint32_t hdr_signature; 148uint32_t hdr_version; 149uint32_t hdr_entries; 150}; 151 152#define INDEX_FORMAT_LB 2 153#define INDEX_FORMAT_UB 4 154 155/* 156 * The "cache_time" is just the low 32 bits of the 157 * time. It doesn't matter if it overflows - we only 158 * check it for equality in the 32 bits we save. 159 */ 160struct cache_time { 161uint32_t sec; 162uint32_t nsec; 163}; 164 165struct stat_data { 166struct cache_time sd_ctime; 167struct cache_time sd_mtime; 168unsigned int sd_dev; 169unsigned int sd_ino; 170unsigned int sd_uid; 171unsigned int sd_gid; 172unsigned int sd_size; 173}; 174 175struct cache_entry { 176struct hashmap_entry ent; 177struct stat_data ce_stat_data; 178unsigned int ce_mode; 179unsigned int ce_flags; 180unsigned int ce_namelen; 181unsigned int index;/* for link extension */ 182struct object_id oid; 183char name[FLEX_ARRAY];/* more */ 184}; 185 186#define CE_STAGEMASK (0x3000) 187#define CE_EXTENDED (0x4000) 188#define CE_VALID (0x8000) 189#define CE_STAGESHIFT 12 190 191/* 192 * Range 0xFFFF0FFF in ce_flags is divided into 193 * two parts: in-memory flags and on-disk ones. 194 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 195 * if you want to save a new flag, add it in 196 * CE_EXTENDED_FLAGS 197 * 198 * In-memory only flags 199 */ 200#define CE_UPDATE (1 << 16) 201#define CE_REMOVE (1 << 17) 202#define CE_UPTODATE (1 << 18) 203#define CE_ADDED (1 << 19) 204 205#define CE_HASHED (1 << 20) 206#define CE_FSMONITOR_VALID (1 << 21) 207#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 208#define CE_CONFLICTED (1 << 23) 209 210#define CE_UNPACKED (1 << 24) 211#define CE_NEW_SKIP_WORKTREE (1 << 25) 212 213/* used to temporarily mark paths matched by pathspecs */ 214#define CE_MATCHED (1 << 26) 215 216#define CE_UPDATE_IN_BASE (1 << 27) 217#define CE_STRIP_NAME (1 << 28) 218 219/* 220 * Extended on-disk flags 221 */ 222#define CE_INTENT_TO_ADD (1 << 29) 223#define CE_SKIP_WORKTREE (1 << 30) 224/* CE_EXTENDED2 is for future extension */ 225#define CE_EXTENDED2 (1U << 31) 226 227#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 228 229/* 230 * Safeguard to avoid saving wrong flags: 231 * - CE_EXTENDED2 won't get saved until its semantic is known 232 * - Bits in 0x0000FFFF have been saved in ce_flags already 233 * - Bits in 0x003F0000 are currently in-memory flags 234 */ 235#if CE_EXTENDED_FLAGS & 0x803FFFFF 236#error"CE_EXTENDED_FLAGS out of range" 237#endif 238 239/* Forward structure decls */ 240struct pathspec; 241struct child_process; 242 243/* 244 * Copy the sha1 and stat state of a cache entry from one to 245 * another. But we never change the name, or the hash state! 246 */ 247staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 248const struct cache_entry *src) 249{ 250unsigned int state = dst->ce_flags & CE_HASHED; 251 252/* Don't copy hash chain and name */ 253memcpy(&dst->ce_stat_data, &src->ce_stat_data, 254offsetof(struct cache_entry, name) - 255offsetof(struct cache_entry, ce_stat_data)); 256 257/* Restore the hash state */ 258 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 259} 260 261staticinlineunsignedcreate_ce_flags(unsigned stage) 262{ 263return(stage << CE_STAGESHIFT); 264} 265 266#define ce_namelen(ce) ((ce)->ce_namelen) 267#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 268#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 269#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 270#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 271#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 272#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 273 274#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 275staticinlineunsigned intcreate_ce_mode(unsigned int mode) 276{ 277if(S_ISLNK(mode)) 278return S_IFLNK; 279if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 280return S_IFGITLINK; 281return S_IFREG |ce_permissions(mode); 282} 283staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 284unsigned int mode) 285{ 286externint trust_executable_bit, has_symlinks; 287if(!has_symlinks &&S_ISREG(mode) && 288 ce &&S_ISLNK(ce->ce_mode)) 289return ce->ce_mode; 290if(!trust_executable_bit &&S_ISREG(mode)) { 291if(ce &&S_ISREG(ce->ce_mode)) 292return ce->ce_mode; 293returncreate_ce_mode(0666); 294} 295returncreate_ce_mode(mode); 296} 297staticinlineintce_to_dtype(const struct cache_entry *ce) 298{ 299unsigned ce_mode =ntohl(ce->ce_mode); 300if(S_ISREG(ce_mode)) 301return DT_REG; 302else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 303return DT_DIR; 304else if(S_ISLNK(ce_mode)) 305return DT_LNK; 306else 307return DT_UNKNOWN; 308} 309staticinlineunsigned intcanon_mode(unsigned int mode) 310{ 311if(S_ISREG(mode)) 312return S_IFREG |ce_permissions(mode); 313if(S_ISLNK(mode)) 314return S_IFLNK; 315if(S_ISDIR(mode)) 316return S_IFDIR; 317return S_IFGITLINK; 318} 319 320#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 321 322#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 323#define CE_ENTRY_CHANGED (1 << 1) 324#define CE_ENTRY_REMOVED (1 << 2) 325#define CE_ENTRY_ADDED (1 << 3) 326#define RESOLVE_UNDO_CHANGED (1 << 4) 327#define CACHE_TREE_CHANGED (1 << 5) 328#define SPLIT_INDEX_ORDERED (1 << 6) 329#define UNTRACKED_CHANGED (1 << 7) 330#define FSMONITOR_CHANGED (1 << 8) 331 332struct split_index; 333struct untracked_cache; 334 335struct index_state { 336struct cache_entry **cache; 337unsigned int version; 338unsigned int cache_nr, cache_alloc, cache_changed; 339struct string_list *resolve_undo; 340struct cache_tree *cache_tree; 341struct split_index *split_index; 342struct cache_time timestamp; 343unsigned name_hash_initialized :1, 344 initialized :1; 345struct hashmap name_hash; 346struct hashmap dir_hash; 347unsigned char sha1[20]; 348struct untracked_cache *untracked; 349uint64_t fsmonitor_last_update; 350}; 351 352externstruct index_state the_index; 353 354/* Name hashing */ 355externinttest_lazy_init_name_hash(struct index_state *istate,int try_threaded); 356externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 357externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 358externvoidfree_name_hash(struct index_state *istate); 359 360 361#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 362#define active_cache (the_index.cache) 363#define active_nr (the_index.cache_nr) 364#define active_alloc (the_index.cache_alloc) 365#define active_cache_changed (the_index.cache_changed) 366#define active_cache_tree (the_index.cache_tree) 367 368#define read_cache() read_index(&the_index) 369#define read_cache_from(path) read_index_from(&the_index, (path)) 370#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 371#define is_cache_unborn() is_index_unborn(&the_index) 372#define read_cache_unmerged() read_index_unmerged(&the_index) 373#define discard_cache() discard_index(&the_index) 374#define unmerged_cache() unmerged_index(&the_index) 375#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 376#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 377#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 378#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 379#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 380#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 381#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 382#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 383#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 384#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 385#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 386#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 387#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 388#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 389#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 390#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 391#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 392#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 393#endif 394 395enum object_type { 396 OBJ_BAD = -1, 397 OBJ_NONE =0, 398 OBJ_COMMIT =1, 399 OBJ_TREE =2, 400 OBJ_BLOB =3, 401 OBJ_TAG =4, 402/* 5 for future expansion */ 403 OBJ_OFS_DELTA =6, 404 OBJ_REF_DELTA =7, 405 OBJ_ANY, 406 OBJ_MAX 407}; 408 409staticinlineenum object_type object_type(unsigned int mode) 410{ 411returnS_ISDIR(mode) ? OBJ_TREE : 412S_ISGITLINK(mode) ? OBJ_COMMIT : 413 OBJ_BLOB; 414} 415 416/* Double-check local_repo_env below if you add to this list. */ 417#define GIT_DIR_ENVIRONMENT"GIT_DIR" 418#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 419#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 420#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 421#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 422#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 423#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 424#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 425#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 426#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 427#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 428#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 429#define CONFIG_ENVIRONMENT"GIT_CONFIG" 430#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 431#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 432#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 433#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 434#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 435#define GITATTRIBUTES_FILE".gitattributes" 436#define INFOATTRIBUTES_FILE"info/attributes" 437#define ATTRIBUTE_MACRO_PREFIX"[attr]" 438#define GITMODULES_FILE".gitmodules" 439#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 440#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 441#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 442#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 443#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 444#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 445#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 446#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 447#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 448#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 449 450/* 451 * This environment variable is expected to contain a boolean indicating 452 * whether we should or should not treat: 453 * 454 * GIT_DIR=foo.git git ... 455 * 456 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 457 * of this, but we use it internally to communicate to sub-processes that we 458 * are in a bare repo. If not set, defaults to true. 459 */ 460#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 461 462/* 463 * Repository-local GIT_* environment variables; these will be cleared 464 * when git spawns a sub-process that runs inside another repository. 465 * The array is NULL-terminated, which makes it easy to pass in the "env" 466 * parameter of a run-command invocation, or to do a simple walk. 467 */ 468externconst char*const local_repo_env[]; 469 470externvoidsetup_git_env(void); 471 472/* 473 * Returns true iff we have a configured git repository (either via 474 * setup_git_directory, or in the environment via $GIT_DIR). 475 */ 476inthave_git_dir(void); 477 478externint is_bare_repository_cfg; 479externintis_bare_repository(void); 480externintis_inside_git_dir(void); 481externchar*git_work_tree_cfg; 482externintis_inside_work_tree(void); 483externconst char*get_git_dir(void); 484externconst char*get_git_common_dir(void); 485externchar*get_object_directory(void); 486externchar*get_index_file(void); 487externchar*get_graft_file(void); 488externintset_git_dir(const char*path); 489externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 490externintget_common_dir(struct strbuf *sb,const char*gitdir); 491externconst char*get_git_namespace(void); 492externconst char*strip_namespace(const char*namespaced_ref); 493externconst char*get_super_prefix(void); 494externconst char*get_git_work_tree(void); 495 496/* 497 * Return true if the given path is a git directory; note that this _just_ 498 * looks at the directory itself. If you want to know whether "foo/.git" 499 * is a repository, you must feed that path, not just "foo". 500 */ 501externintis_git_directory(const char*path); 502 503/* 504 * Return 1 if the given path is the root of a git repository or 505 * submodule, else 0. Will not return 1 for bare repositories with the 506 * exception of creating a bare repository in "foo/.git" and calling 507 * is_git_repository("foo"). 508 * 509 * If we run into read errors, we err on the side of saying "yes, it is", 510 * as we usually consider sub-repos precious, and would prefer to err on the 511 * side of not disrupting or deleting them. 512 */ 513externintis_nonbare_repository_dir(struct strbuf *path); 514 515#define READ_GITFILE_ERR_STAT_FAILED 1 516#define READ_GITFILE_ERR_NOT_A_FILE 2 517#define READ_GITFILE_ERR_OPEN_FAILED 3 518#define READ_GITFILE_ERR_READ_FAILED 4 519#define READ_GITFILE_ERR_INVALID_FORMAT 5 520#define READ_GITFILE_ERR_NO_PATH 6 521#define READ_GITFILE_ERR_NOT_A_REPO 7 522#define READ_GITFILE_ERR_TOO_LARGE 8 523externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 524externconst char*read_gitfile_gently(const char*path,int*return_error_code); 525#define read_gitfile(path) read_gitfile_gently((path), NULL) 526externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 527#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 528 529externvoidset_git_work_tree(const char*tree); 530 531#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 532 533externvoidsetup_work_tree(void); 534/* 535 * Find the commondir and gitdir of the repository that contains the current 536 * working directory, without changing the working directory or other global 537 * state. The result is appended to commondir and gitdir. If the discovered 538 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 539 * both have the same result appended to the buffer. The return value is 540 * either 0 upon success and non-zero if no repository was found. 541 */ 542externintdiscover_git_directory(struct strbuf *commondir, 543struct strbuf *gitdir); 544externconst char*setup_git_directory_gently(int*); 545externconst char*setup_git_directory(void); 546externchar*prefix_path(const char*prefix,int len,const char*path); 547externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 548 549/* 550 * Concatenate "prefix" (if len is non-zero) and "path", with no 551 * connecting characters (so "prefix" should end with a "/"). 552 * Unlike prefix_path, this should be used if the named file does 553 * not have to interact with index entry; i.e. name of a random file 554 * on the filesystem. 555 * 556 * The return value is always a newly allocated string (even if the 557 * prefix was empty). 558 */ 559externchar*prefix_filename(const char*prefix,const char*path); 560 561externintcheck_filename(const char*prefix,const char*name); 562externvoidverify_filename(const char*prefix, 563const char*name, 564int diagnose_misspelt_rev); 565externvoidverify_non_filename(const char*prefix,const char*name); 566externintpath_inside_repo(const char*prefix,const char*path); 567 568#define INIT_DB_QUIET 0x0001 569#define INIT_DB_EXIST_OK 0x0002 570 571externintinit_db(const char*git_dir,const char*real_git_dir, 572const char*template_dir,unsigned int flags); 573 574externvoidsanitize_stdfds(void); 575externintdaemonize(void); 576 577#define alloc_nr(x) (((x)+16)*3/2) 578 579/* 580 * Realloc the buffer pointed at by variable 'x' so that it can hold 581 * at least 'nr' entries; the number of entries currently allocated 582 * is 'alloc', using the standard growing factor alloc_nr() macro. 583 * 584 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 585 */ 586#define ALLOC_GROW(x, nr, alloc) \ 587 do { \ 588 if ((nr) > alloc) { \ 589 if (alloc_nr(alloc) < (nr)) \ 590 alloc = (nr); \ 591 else \ 592 alloc = alloc_nr(alloc); \ 593 REALLOC_ARRAY(x, alloc); \ 594 } \ 595 } while (0) 596 597/* Initialize and use the cache information */ 598struct lock_file; 599externintread_index(struct index_state *); 600externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 601externintdo_read_index(struct index_state *istate,const char*path, 602int must_exist);/* for testting only! */ 603externintread_index_from(struct index_state *,const char*path); 604externintis_index_unborn(struct index_state *); 605externintread_index_unmerged(struct index_state *); 606#define COMMIT_LOCK (1 << 0) 607#define CLOSE_LOCK (1 << 1) 608externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 609externintdiscard_index(struct index_state *); 610externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 611externintunmerged_index(const struct index_state *); 612externintverify_path(const char*path); 613externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 614externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 615externvoidadjust_dirname_case(struct index_state *istate,char*name); 616externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 617 618/* 619 * Searches for an entry defined by name and namelen in the given index. 620 * If the return value is positive (including 0) it is the position of an 621 * exact match. If the return value is negative, the negated value minus 1 622 * is the position where the entry would be inserted. 623 * Example: The current index consists of these files and its stages: 624 * 625 * b#0, d#0, f#1, f#3 626 * 627 * index_name_pos(&index, "a", 1) -> -1 628 * index_name_pos(&index, "b", 1) -> 0 629 * index_name_pos(&index, "c", 1) -> -2 630 * index_name_pos(&index, "d", 1) -> 1 631 * index_name_pos(&index, "e", 1) -> -3 632 * index_name_pos(&index, "f", 1) -> -3 633 * index_name_pos(&index, "g", 1) -> -5 634 */ 635externintindex_name_pos(const struct index_state *,const char*name,int namelen); 636 637#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 638#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 639#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 640#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 641#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 642#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 643externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 644externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 645 646/* Remove entry, return true if there are more entries to go. */ 647externintremove_index_entry_at(struct index_state *,int pos); 648 649externvoidremove_marked_cache_entries(struct index_state *istate); 650externintremove_file_from_index(struct index_state *,const char*path); 651#define ADD_CACHE_VERBOSE 1 652#define ADD_CACHE_PRETEND 2 653#define ADD_CACHE_IGNORE_ERRORS 4 654#define ADD_CACHE_IGNORE_REMOVAL 8 655#define ADD_CACHE_INTENT 16 656/* 657 * These two are used to add the contents of the file at path 658 * to the index, marking the working tree up-to-date by storing 659 * the cached stat info in the resulting cache entry. A caller 660 * that has already run lstat(2) on the path can call 661 * add_to_index(), and all others can call add_file_to_index(); 662 * the latter will do necessary lstat(2) internally before 663 * calling the former. 664 */ 665externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 666externintadd_file_to_index(struct index_state *,const char*path,int flags); 667 668externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 669externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 670externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 671externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 672externintindex_name_is_other(const struct index_state *,const char*,int); 673externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 674 675/* do stat comparison even if CE_VALID is true */ 676#define CE_MATCH_IGNORE_VALID 01 677/* do not check the contents but report dirty on racily-clean entries */ 678#define CE_MATCH_RACY_IS_DIRTY 02 679/* do stat comparison even if CE_SKIP_WORKTREE is true */ 680#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 681/* ignore non-existent files during stat update */ 682#define CE_MATCH_IGNORE_MISSING 0x08 683/* enable stat refresh */ 684#define CE_MATCH_REFRESH 0x10 685/* don't refresh_fsmonitor state or do stat comparison even if CE_FSMONITOR_VALID is true */ 686#define CE_MATCH_IGNORE_FSMONITOR 0X20 687externintie_match_stat(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 688externintie_modified(struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 689 690#define HASH_WRITE_OBJECT 1 691#define HASH_FORMAT_CHECK 2 692externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 693externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 694 695/* 696 * Record to sd the data from st that we use to check whether a file 697 * might have changed. 698 */ 699externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 700 701/* 702 * Return 0 if st is consistent with a file not having been changed 703 * since sd was filled. If there are differences, return a 704 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 705 * INODE_CHANGED, and DATA_CHANGED. 706 */ 707externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 708externintmatch_stat_data_racy(const struct index_state *istate, 709const struct stat_data *sd,struct stat *st); 710 711externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 712 713#define REFRESH_REALLY 0x0001/* ignore_valid */ 714#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 715#define REFRESH_QUIET 0x0004/* be quiet about it */ 716#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 717#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 718#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 719externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 720externstruct cache_entry *refresh_cache_entry(struct cache_entry *,unsigned int); 721 722externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 723 724externinthold_locked_index(struct lock_file *,int); 725externvoidset_alternate_index_output(const char*); 726 727externint verify_index_checksum; 728 729/* Environment bits from configuration mechanism */ 730externint trust_executable_bit; 731externint trust_ctime; 732externint check_stat; 733externint quote_path_fully; 734externint has_symlinks; 735externint minimum_abbrev, default_abbrev; 736externint ignore_case; 737externint assume_unchanged; 738externint prefer_symlink_refs; 739externint warn_ambiguous_refs; 740externint warn_on_object_refname_ambiguity; 741externconst char*apply_default_whitespace; 742externconst char*apply_default_ignorewhitespace; 743externconst char*git_attributes_file; 744externconst char*git_hooks_path; 745externint zlib_compression_level; 746externint core_compression_level; 747externint pack_compression_level; 748externsize_t packed_git_window_size; 749externsize_t packed_git_limit; 750externsize_t delta_base_cache_limit; 751externunsigned long big_file_threshold; 752externunsigned long pack_size_limit_cfg; 753 754/* 755 * Accessors for the core.sharedrepository config which lazy-load the value 756 * from the config (if not already set). The "reset" function can be 757 * used to unset "set" or cached value, meaning that the value will be loaded 758 * fresh from the config file on the next call to get_shared_repository(). 759 */ 760voidset_shared_repository(int value); 761intget_shared_repository(void); 762voidreset_shared_repository(void); 763 764/* 765 * Do replace refs need to be checked this run? This variable is 766 * initialized to true unless --no-replace-object is used or 767 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 768 * commands that do not want replace references to be active. As an 769 * optimization it is also set to false if replace references have 770 * been sought but there were none. 771 */ 772externint check_replace_refs; 773externchar*git_replace_ref_base; 774 775externint fsync_object_files; 776externint core_preload_index; 777externint core_apply_sparse_checkout; 778externint precomposed_unicode; 779externint protect_hfs; 780externint protect_ntfs; 781externconst char*core_fsmonitor; 782 783/* 784 * Include broken refs in all ref iterations, which will 785 * generally choke dangerous operations rather than letting 786 * them silently proceed without taking the broken ref into 787 * account. 788 */ 789externint ref_paranoia; 790 791/* 792 * The character that begins a commented line in user-editable file 793 * that is subject to stripspace. 794 */ 795externchar comment_line_char; 796externint auto_comment_line_char; 797 798/* Windows only */ 799enum hide_dotfiles_type { 800 HIDE_DOTFILES_FALSE =0, 801 HIDE_DOTFILES_TRUE, 802 HIDE_DOTFILES_DOTGITONLY 803}; 804externenum hide_dotfiles_type hide_dotfiles; 805 806enum log_refs_config { 807 LOG_REFS_UNSET = -1, 808 LOG_REFS_NONE =0, 809 LOG_REFS_NORMAL, 810 LOG_REFS_ALWAYS 811}; 812externenum log_refs_config log_all_ref_updates; 813 814enum branch_track { 815 BRANCH_TRACK_UNSPECIFIED = -1, 816 BRANCH_TRACK_NEVER =0, 817 BRANCH_TRACK_REMOTE, 818 BRANCH_TRACK_ALWAYS, 819 BRANCH_TRACK_EXPLICIT, 820 BRANCH_TRACK_OVERRIDE 821}; 822 823enum rebase_setup_type { 824 AUTOREBASE_NEVER =0, 825 AUTOREBASE_LOCAL, 826 AUTOREBASE_REMOTE, 827 AUTOREBASE_ALWAYS 828}; 829 830enum push_default_type { 831 PUSH_DEFAULT_NOTHING =0, 832 PUSH_DEFAULT_MATCHING, 833 PUSH_DEFAULT_SIMPLE, 834 PUSH_DEFAULT_UPSTREAM, 835 PUSH_DEFAULT_CURRENT, 836 PUSH_DEFAULT_UNSPECIFIED 837}; 838 839externenum branch_track git_branch_track; 840externenum rebase_setup_type autorebase; 841externenum push_default_type push_default; 842 843enum object_creation_mode { 844 OBJECT_CREATION_USES_HARDLINKS =0, 845 OBJECT_CREATION_USES_RENAMES =1 846}; 847 848externenum object_creation_mode object_creation_mode; 849 850externchar*notes_ref_name; 851 852externint grafts_replace_parents; 853 854/* 855 * GIT_REPO_VERSION is the version we write by default. The 856 * _READ variant is the highest number we know how to 857 * handle. 858 */ 859#define GIT_REPO_VERSION 0 860#define GIT_REPO_VERSION_READ 1 861externint repository_format_precious_objects; 862 863struct repository_format { 864int version; 865int precious_objects; 866int is_bare; 867char*work_tree; 868struct string_list unknown_extensions; 869}; 870 871/* 872 * Read the repository format characteristics from the config file "path" into 873 * "format" struct. Returns the numeric version. On error, -1 is returned, 874 * format->version is set to -1, and all other fields in the struct are 875 * undefined. 876 */ 877intread_repository_format(struct repository_format *format,const char*path); 878 879/* 880 * Verify that the repository described by repository_format is something we 881 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 882 * any errors encountered. 883 */ 884intverify_repository_format(const struct repository_format *format, 885struct strbuf *err); 886 887/* 888 * Check the repository format version in the path found in get_git_dir(), 889 * and die if it is a version we don't understand. Generally one would 890 * set_git_dir() before calling this, and use it only for "are we in a valid 891 * repo?". 892 */ 893externvoidcheck_repository_format(void); 894 895#define MTIME_CHANGED 0x0001 896#define CTIME_CHANGED 0x0002 897#define OWNER_CHANGED 0x0004 898#define MODE_CHANGED 0x0008 899#define INODE_CHANGED 0x0010 900#define DATA_CHANGED 0x0020 901#define TYPE_CHANGED 0x0040 902 903/* 904 * Return the name of the file in the local object database that would 905 * be used to store a loose object with the specified sha1. The 906 * return value is a pointer to a statically allocated buffer that is 907 * overwritten each time the function is called. 908 */ 909externconst char*sha1_file_name(const unsigned char*sha1); 910 911/* 912 * Return an abbreviated sha1 unique within this repository's object database. 913 * The result will be at least `len` characters long, and will be NUL 914 * terminated. 915 * 916 * The non-`_r` version returns a static buffer which remains valid until 4 917 * more calls to find_unique_abbrev are made. 918 * 919 * The `_r` variant writes to a buffer supplied by the caller, which must be at 920 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes 921 * written (excluding the NUL terminator). 922 * 923 * Note that while this version avoids the static buffer, it is not fully 924 * reentrant, as it calls into other non-reentrant git code. 925 */ 926externconst char*find_unique_abbrev(const unsigned char*sha1,int len); 927externintfind_unique_abbrev_r(char*hex,const unsigned char*sha1,int len); 928 929externconst unsigned char null_sha1[GIT_MAX_RAWSZ]; 930externconst struct object_id null_oid; 931 932staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 933{ 934returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ); 935} 936 937staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 938{ 939returnhashcmp(oid1->hash, oid2->hash); 940} 941 942staticinlineintis_null_sha1(const unsigned char*sha1) 943{ 944return!hashcmp(sha1, null_sha1); 945} 946 947staticinlineintis_null_oid(const struct object_id *oid) 948{ 949return!hashcmp(oid->hash, null_sha1); 950} 951 952staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 953{ 954memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 955} 956 957staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 958{ 959hashcpy(dst->hash, src->hash); 960} 961 962staticinlinestruct object_id *oiddup(const struct object_id *src) 963{ 964struct object_id *dst =xmalloc(sizeof(struct object_id)); 965oidcpy(dst, src); 966return dst; 967} 968 969staticinlinevoidhashclr(unsigned char*hash) 970{ 971memset(hash,0, GIT_SHA1_RAWSZ); 972} 973 974staticinlinevoidoidclr(struct object_id *oid) 975{ 976hashclr(oid->hash); 977} 978 979 980#define EMPTY_TREE_SHA1_HEX \ 981"4b825dc642cb6eb9a060e54bf8d69288fbee4904" 982#define EMPTY_TREE_SHA1_BIN_LITERAL \ 983"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ 984"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" 985externconst struct object_id empty_tree_oid; 986#define EMPTY_TREE_SHA1_BIN (empty_tree_oid.hash) 987 988#define EMPTY_BLOB_SHA1_HEX \ 989"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" 990#define EMPTY_BLOB_SHA1_BIN_LITERAL \ 991"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ 992"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" 993externconst struct object_id empty_blob_oid; 994#define EMPTY_BLOB_SHA1_BIN (empty_blob_oid.hash) 995 996 997staticinlineintis_empty_blob_sha1(const unsigned char*sha1) 998{ 999return!hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);1000}10011002staticinlineintis_empty_blob_oid(const struct object_id *oid)1003{1004return!hashcmp(oid->hash, EMPTY_BLOB_SHA1_BIN);1005}10061007staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1008{1009return!hashcmp(sha1, EMPTY_TREE_SHA1_BIN);1010}10111012staticinlineintis_empty_tree_oid(const struct object_id *oid)1013{1014return!hashcmp(oid->hash, EMPTY_TREE_SHA1_BIN);1015}10161017/* set default permissions by passing mode arguments to open(2) */1018intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1019intgit_mkstemp_mode(char*pattern,int mode);10201021/*1022 * NOTE NOTE NOTE!!1023 *1024 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1025 * not be changed. Old repositories have core.sharedrepository written in1026 * numeric format, and therefore these values are preserved for compatibility1027 * reasons.1028 */1029enum sharedrepo {1030 PERM_UMASK =0,1031 OLD_PERM_GROUP =1,1032 OLD_PERM_EVERYBODY =2,1033 PERM_GROUP =0660,1034 PERM_EVERYBODY =06641035};1036intgit_config_perm(const char*var,const char*value);1037intadjust_shared_perm(const char*path);10381039/*1040 * Create the directory containing the named path, using care to be1041 * somewhat safe against races. Return one of the scld_error values to1042 * indicate success/failure. On error, set errno to describe the1043 * problem.1044 *1045 * SCLD_VANISHED indicates that one of the ancestor directories of the1046 * path existed at one point during the function call and then1047 * suddenly vanished, probably because another process pruned the1048 * directory while we were working. To be robust against this kind of1049 * race, callers might want to try invoking the function again when it1050 * returns SCLD_VANISHED.1051 *1052 * safe_create_leading_directories() temporarily changes path while it1053 * is working but restores it before returning.1054 * safe_create_leading_directories_const() doesn't modify path, even1055 * temporarily.1056 */1057enum scld_error {1058 SCLD_OK =0,1059 SCLD_FAILED = -1,1060 SCLD_PERMS = -2,1061 SCLD_EXISTS = -3,1062 SCLD_VANISHED = -41063};1064enum scld_error safe_create_leading_directories(char*path);1065enum scld_error safe_create_leading_directories_const(const char*path);10661067/*1068 * Callback function for raceproof_create_file(). This function is1069 * expected to do something that makes dirname(path) permanent despite1070 * the fact that other processes might be cleaning up empty1071 * directories at the same time. Usually it will create a file named1072 * path, but alternatively it could create another file in that1073 * directory, or even chdir() into that directory. The function should1074 * return 0 if the action was completed successfully. On error, it1075 * should return a nonzero result and set errno.1076 * raceproof_create_file() treats two errno values specially:1077 *1078 * - ENOENT -- dirname(path) does not exist. In this case,1079 * raceproof_create_file() tries creating dirname(path)1080 * (and any parent directories, if necessary) and calls1081 * the function again.1082 *1083 * - EISDIR -- the file already exists and is a directory. In this1084 * case, raceproof_create_file() removes the directory if1085 * it is empty (and recursively any empty directories that1086 * it contains) and calls the function again.1087 *1088 * Any other errno causes raceproof_create_file() to fail with the1089 * callback's return value and errno.1090 *1091 * Obviously, this function should be OK with being called again if it1092 * fails with ENOENT or EISDIR. In other scenarios it will not be1093 * called again.1094 */1095typedefintcreate_file_fn(const char*path,void*cb);10961097/*1098 * Create a file in dirname(path) by calling fn, creating leading1099 * directories if necessary. Retry a few times in case we are racing1100 * with another process that is trying to clean up the directory that1101 * contains path. See the documentation for create_file_fn for more1102 * details.1103 *1104 * Return the value and set the errno that resulted from the most1105 * recent call of fn. fn is always called at least once, and will be1106 * called more than once if it returns ENOENT or EISDIR.1107 */1108intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11091110intmkdir_in_gitdir(const char*path);1111externchar*expand_user_path(const char*path,int real_home);1112const char*enter_repo(const char*path,int strict);1113staticinlineintis_absolute_path(const char*path)1114{1115returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1116}1117intis_directory(const char*);1118char*strbuf_realpath(struct strbuf *resolved,const char*path,1119int die_on_error);1120const char*real_path(const char*path);1121const char*real_path_if_valid(const char*path);1122char*real_pathdup(const char*path,int die_on_error);1123const char*absolute_path(const char*path);1124char*absolute_pathdup(const char*path);1125const char*remove_leading_path(const char*in,const char*prefix);1126const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1127intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1128intnormalize_path_copy(char*dst,const char*src);1129intlongest_ancestor_length(const char*path,struct string_list *prefixes);1130char*strip_path_suffix(const char*path,const char*suffix);1131intdaemon_avoid_alias(const char*path);1132externintis_ntfs_dotgit(const char*name);11331134/*1135 * Returns true iff "str" could be confused as a command-line option when1136 * passed to a sub-program like "ssh". Note that this has nothing to do with1137 * shell-quoting, which should be handled separately; we're assuming here that1138 * the string makes it verbatim to the sub-program.1139 */1140intlooks_like_command_line_option(const char*str);11411142/**1143 * Return a newly allocated string with the evaluation of1144 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1145 * "$HOME/.config/git/$filename". Return NULL upon error.1146 */1147externchar*xdg_config_home(const char*filename);11481149/**1150 * Return a newly allocated string with the evaluation of1151 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1152 * "$HOME/.cache/git/$filename". Return NULL upon error.1153 */1154externchar*xdg_cache_home(const char*filename);11551156externvoid*read_sha1_file_extended(const unsigned char*sha1,1157enum object_type *type,1158unsigned long*size,int lookup_replace);1159staticinlinevoid*read_sha1_file(const unsigned char*sha1,enum object_type *type,unsigned long*size)1160{1161returnread_sha1_file_extended(sha1, type, size,1);1162}11631164/*1165 * This internal function is only declared here for the benefit of1166 * lookup_replace_object(). Please do not call it directly.1167 */1168externconst unsigned char*do_lookup_replace_object(const unsigned char*sha1);11691170/*1171 * If object sha1 should be replaced, return the replacement object's1172 * name (replaced recursively, if necessary). The return value is1173 * either sha1 or a pointer to a permanently-allocated value. When1174 * object replacement is suppressed, always return sha1.1175 */1176staticinlineconst unsigned char*lookup_replace_object(const unsigned char*sha1)1177{1178if(!check_replace_refs)1179return sha1;1180returndo_lookup_replace_object(sha1);1181}11821183/* Read and unpack a sha1 file into memory, write memory to a sha1 file */1184externintsha1_object_info(const unsigned char*,unsigned long*);1185externinthash_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*sha1);1186externintwrite_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*return_sha1);1187externinthash_sha1_file_literally(const void*buf,unsigned long len,const char*type,struct object_id *oid,unsigned flags);1188externintpretend_sha1_file(void*,unsigned long,enum object_type,unsigned char*);1189externintforce_object_loose(const unsigned char*sha1,time_t mtime);1190externintgit_open_cloexec(const char*name,int flags);1191#define git_open(name) git_open_cloexec(name, O_RDONLY)1192externvoid*map_sha1_file(const unsigned char*sha1,unsigned long*size);1193externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1194externintparse_sha1_header(const char*hdr,unsigned long*sizep);11951196externintcheck_sha1_signature(const unsigned char*sha1,void*buf,unsigned long size,const char*type);11971198externintfinalize_object_file(const char*tmpfile,const char*filename);11991200/*1201 * Open the loose object at path, check its sha1, and return the contents,1202 * type, and size. If the object is a blob, then "contents" may return NULL,1203 * to allow streaming of large blobs.1204 *1205 * Returns 0 on success, negative on error (details may be written to stderr).1206 */1207intread_loose_object(const char*path,1208const unsigned char*expected_sha1,1209enum object_type *type,1210unsigned long*size,1211void**contents);12121213/*1214 * Convenience for sha1_object_info_extended() with a NULL struct1215 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1216 * nonzero flags to also set other flags.1217 */1218externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1219staticinlineinthas_sha1_file(const unsigned char*sha1)1220{1221returnhas_sha1_file_with_flags(sha1,0);1222}12231224/* Same as the above, except for struct object_id. */1225externinthas_object_file(const struct object_id *oid);1226externinthas_object_file_with_flags(const struct object_id *oid,int flags);12271228/*1229 * Return true iff an alternate object database has a loose object1230 * with the specified name. This function does not respect replace1231 * references.1232 */1233externinthas_loose_object_nonlocal(const unsigned char*sha1);12341235externvoidassert_sha1_type(const unsigned char*sha1,enum object_type expect);12361237/* Helper to check and "touch" a file */1238externintcheck_and_freshen_file(const char*fn,int freshen);12391240externconst signed char hexval_table[256];1241staticinlineunsigned inthexval(unsigned char c)1242{1243return hexval_table[c];1244}12451246/*1247 * Convert two consecutive hexadecimal digits into a char. Return a1248 * negative value on error. Don't run over the end of short strings.1249 */1250staticinlineinthex2chr(const char*s)1251{1252int val =hexval(s[0]);1253return(val <0) ? val : (val <<4) |hexval(s[1]);1254}12551256/* Convert to/from hex/sha1 representation */1257#define MINIMUM_ABBREV minimum_abbrev1258#define DEFAULT_ABBREV default_abbrev12591260/* used when the code does not know or care what the default abbrev is */1261#define FALLBACK_DEFAULT_ABBREV 712621263struct object_context {1264unsigned char tree[20];1265unsigned mode;1266/*1267 * symlink_path is only used by get_tree_entry_follow_symlinks,1268 * and only for symlinks that point outside the repository.1269 */1270struct strbuf symlink_path;1271/*1272 * If GET_OID_RECORD_PATH is set, this will record path (if any)1273 * found when resolving the name. The caller is responsible for1274 * releasing the memory.1275 */1276char*path;1277};12781279#define GET_OID_QUIETLY 011280#define GET_OID_COMMIT 021281#define GET_OID_COMMITTISH 041282#define GET_OID_TREE 0101283#define GET_OID_TREEISH 0201284#define GET_OID_BLOB 0401285#define GET_OID_FOLLOW_SYMLINKS 01001286#define GET_OID_RECORD_PATH 02001287#define GET_OID_ONLY_TO_DIE 0400012881289#define GET_OID_DISAMBIGUATORS \1290 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1291 GET_OID_TREE | GET_OID_TREEISH | \1292 GET_OID_BLOB)12931294externintget_oid(const char*str,struct object_id *oid);1295externintget_oid_commit(const char*str,struct object_id *oid);1296externintget_oid_committish(const char*str,struct object_id *oid);1297externintget_oid_tree(const char*str,struct object_id *oid);1298externintget_oid_treeish(const char*str,struct object_id *oid);1299externintget_oid_blob(const char*str,struct object_id *oid);1300externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1301externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);130213031304typedefinteach_abbrev_fn(const struct object_id *oid,void*);1305externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13061307externintset_disambiguate_hint_config(const char*var,const char*value);13081309/*1310 * Try to read a SHA1 in hexadecimal format from the 40 characters1311 * starting at hex. Write the 20-byte result to sha1 in binary form.1312 * Return 0 on success. Reading stops if a NUL is encountered in the1313 * input, so it is safe to pass this function an arbitrary1314 * null-terminated string.1315 */1316externintget_sha1_hex(const char*hex,unsigned char*sha1);1317externintget_oid_hex(const char*hex,struct object_id *sha1);13181319/*1320 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1321 * and writes the NUL-terminated output to the buffer `out`, which must be at1322 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1323 * convenience.1324 *1325 * The non-`_r` variant returns a static buffer, but uses a ring of 41326 * buffers, making it safe to make multiple calls for a single statement, like:1327 *1328 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1329 */1330externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1331externchar*oid_to_hex_r(char*out,const struct object_id *oid);1332externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1333externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */13341335/*1336 * Parse a 40-character hexadecimal object ID starting from hex, updating the1337 * pointer specified by end when parsing stops. The resulting object ID is1338 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1339 * other invalid character. end is only updated on success; otherwise, it is1340 * unmodified.1341 */1342externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);13431344/*1345 * This reads short-hand syntax that not only evaluates to a commit1346 * object name, but also can act as if the end user spelled the name1347 * of the branch from the command line.1348 *1349 * - "@{-N}" finds the name of the Nth previous branch we were on, and1350 * places the name of the branch in the given buf and returns the1351 * number of characters parsed if successful.1352 *1353 * - "<branch>@{upstream}" finds the name of the other ref that1354 * <branch> is configured to merge with (missing <branch> defaults1355 * to the current branch), and places the name of the branch in the1356 * given buf and returns the number of characters parsed if1357 * successful.1358 *1359 * If the input is not of the accepted format, it returns a negative1360 * number to signal an error.1361 *1362 * If the input was ok but there are not N branch switches in the1363 * reflog, it returns 0.1364 *1365 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1366 * expansions: local branches ("refs/heads/"), remote branches1367 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1368 * allowed, even ones to refs outside of those namespaces.1369 */1370#define INTERPRET_BRANCH_LOCAL (1<<0)1371#define INTERPRET_BRANCH_REMOTE (1<<1)1372#define INTERPRET_BRANCH_HEAD (1<<2)1373externintinterpret_branch_name(const char*str,int len,struct strbuf *,1374unsigned allowed);1375externintget_oid_mb(const char*str,struct object_id *oid);13761377externintvalidate_headref(const char*ref);13781379externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1380externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1381externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1382externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);13831384externvoid*read_object_with_reference(const unsigned char*sha1,1385const char*required_type,1386unsigned long*size,1387unsigned char*sha1_ret);13881389externstruct object *peel_to_type(const char*name,int namelen,1390struct object *o,enum object_type);13911392struct date_mode {1393enum date_mode_type {1394 DATE_NORMAL =0,1395 DATE_RELATIVE,1396 DATE_SHORT,1397 DATE_ISO8601,1398 DATE_ISO8601_STRICT,1399 DATE_RFC2822,1400 DATE_STRFTIME,1401 DATE_RAW,1402 DATE_UNIX1403} type;1404const char*strftime_fmt;1405int local;1406};14071408/*1409 * Convenience helper for passing a constant type, like:1410 *1411 * show_date(t, tz, DATE_MODE(NORMAL));1412 */1413#define DATE_MODE(t) date_mode_from_type(DATE_##t)1414struct date_mode *date_mode_from_type(enum date_mode_type type);14151416const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1417voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1418struct strbuf *timebuf);1419intparse_date(const char*date,struct strbuf *out);1420intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1421intparse_expiry_date(const char*date, timestamp_t *timestamp);1422voiddatestamp(struct strbuf *out);1423#define approxidate(s) approxidate_careful((s), NULL)1424timestamp_t approxidate_careful(const char*,int*);1425timestamp_t approxidate_relative(const char*date,const struct timeval *now);1426voidparse_date_format(const char*format,struct date_mode *mode);1427intdate_overflows(timestamp_t date);14281429#define IDENT_STRICT 11430#define IDENT_NO_DATE 21431#define IDENT_NO_NAME 41432externconst char*git_author_info(int);1433externconst char*git_committer_info(int);1434externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1435externconst char*fmt_name(const char*name,const char*email);1436externconst char*ident_default_name(void);1437externconst char*ident_default_email(void);1438externconst char*git_editor(void);1439externconst char*git_pager(int stdout_is_tty);1440externintgit_ident_config(const char*,const char*,void*);1441externvoidreset_ident_date(void);14421443struct ident_split {1444const char*name_begin;1445const char*name_end;1446const char*mail_begin;1447const char*mail_end;1448const char*date_begin;1449const char*date_end;1450const char*tz_begin;1451const char*tz_end;1452};1453/*1454 * Signals an success with 0, but time part of the result may be NULL1455 * if the input lacks timestamp and zone1456 */1457externintsplit_ident_line(struct ident_split *,const char*,int);14581459/*1460 * Like show_date, but pull the timestamp and tz parameters from1461 * the ident_split. It will also sanity-check the values and produce1462 * a well-known sentinel date if they appear bogus.1463 */1464const char*show_ident_date(const struct ident_split *id,1465const struct date_mode *mode);14661467/*1468 * Compare split idents for equality or strict ordering. Note that we1469 * compare only the ident part of the line, ignoring any timestamp.1470 *1471 * Because there are two fields, we must choose one as the primary key; we1472 * currently arbitrarily pick the email.1473 */1474externintident_cmp(const struct ident_split *,const struct ident_split *);14751476struct checkout {1477struct index_state *istate;1478const char*base_dir;1479int base_dir_len;1480struct delayed_checkout *delayed_checkout;1481unsigned force:1,1482 quiet:1,1483 not_new:1,1484 refresh_cache:1;1485};1486#define CHECKOUT_INIT { NULL,"" }14871488#define TEMPORARY_FILENAME_LENGTH 251489externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1490externvoidenable_delayed_checkout(struct checkout *state);1491externintfinish_delayed_checkout(struct checkout *state);14921493struct cache_def {1494struct strbuf path;1495int flags;1496int track_flags;1497int prefix_len_stat_func;1498};1499#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1500staticinlinevoidcache_def_clear(struct cache_def *cache)1501{1502strbuf_release(&cache->path);1503}15041505externinthas_symlink_leading_path(const char*name,int len);1506externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1507externintcheck_leading_path(const char*name,int len);1508externinthas_dirs_only_path(const char*name,int len,int prefix_len);1509externvoidschedule_dir_for_removal(const char*name,int len);1510externvoidremove_scheduled_dirs(void);15111512externstruct alternate_object_database {1513struct alternate_object_database *next;15141515/* see alt_scratch_buf() */1516struct strbuf scratch;1517size_t base_len;15181519/*1520 * Used to store the results of readdir(3) calls when searching1521 * for unique abbreviated hashes. This cache is never1522 * invalidated, thus it's racy and not necessarily accurate.1523 * That's fine for its purpose; don't use it for tasks requiring1524 * greater accuracy!1525 */1526char loose_objects_subdir_seen[256];1527struct oid_array loose_objects_cache;15281529char path[FLEX_ARRAY];1530} *alt_odb_list;1531externvoidprepare_alt_odb(void);1532externchar*compute_alternate_path(const char*path,struct strbuf *err);1533typedefintalt_odb_fn(struct alternate_object_database *,void*);1534externintforeach_alt_odb(alt_odb_fn,void*);15351536/*1537 * Allocate a "struct alternate_object_database" but do _not_ actually1538 * add it to the list of alternates.1539 */1540struct alternate_object_database *alloc_alt_odb(const char*dir);15411542/*1543 * Add the directory to the on-disk alternates file; the new entry will also1544 * take effect in the current process.1545 */1546externvoidadd_to_alternates_file(const char*dir);15471548/*1549 * Add the directory to the in-memory list of alternates (along with any1550 * recursive alternates it points to), but do not modify the on-disk alternates1551 * file.1552 */1553externvoidadd_to_alternates_memory(const char*dir);15541555/*1556 * Returns a scratch strbuf pre-filled with the alternate object directory,1557 * including a trailing slash, which can be used to access paths in the1558 * alternate. Always use this over direct access to alt->scratch, as it1559 * cleans up any previous use of the scratch buffer.1560 */1561externstruct strbuf *alt_scratch_buf(struct alternate_object_database *alt);15621563struct pack_window {1564struct pack_window *next;1565unsigned char*base;1566 off_t offset;1567size_t len;1568unsigned int last_used;1569unsigned int inuse_cnt;1570};15711572externstruct packed_git {1573struct packed_git *next;1574struct pack_window *windows;1575 off_t pack_size;1576const void*index_data;1577size_t index_size;1578uint32_t num_objects;1579uint32_t num_bad_objects;1580unsigned char*bad_object_sha1;1581int index_version;1582time_t mtime;1583int pack_fd;1584unsigned pack_local:1,1585 pack_keep:1,1586 freshened:1,1587 do_not_close:1;1588unsigned char sha1[20];1589struct revindex_entry *revindex;1590/* something like ".git/objects/pack/xxxxx.pack" */1591char pack_name[FLEX_ARRAY];/* more */1592} *packed_git;15931594/*1595 * A most-recently-used ordered version of the packed_git list, which can1596 * be iterated instead of packed_git (and marked via mru_mark).1597 */1598struct mru;1599externstruct mru *packed_git_mru;16001601struct pack_entry {1602 off_t offset;1603unsigned char sha1[20];1604struct packed_git *p;1605};16061607/*1608 * Create a temporary file rooted in the object database directory, or1609 * die on failure. The filename is taken from "pattern", which should have the1610 * usual "XXXXXX" trailer, and the resulting filename is written into the1611 * "template" buffer. Returns the open descriptor.1612 */1613externintodb_mkstemp(struct strbuf *template,const char*pattern);16141615/*1616 * Create a pack .keep file named "name" (which should generally be the output1617 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1618 * error.1619 */1620externintodb_pack_keep(const char*name);16211622/*1623 * Iterate over the files in the loose-object parts of the object1624 * directory "path", triggering the following callbacks:1625 *1626 * - loose_object is called for each loose object we find.1627 *1628 * - loose_cruft is called for any files that do not appear to be1629 * loose objects. Note that we only look in the loose object1630 * directories "objects/[0-9a-f]{2}/", so we will not report1631 * "objects/foobar" as cruft.1632 *1633 * - loose_subdir is called for each top-level hashed subdirectory1634 * of the object directory (e.g., "$OBJDIR/f0"). It is called1635 * after the objects in the directory are processed.1636 *1637 * Any callback that is NULL will be ignored. Callbacks returning non-zero1638 * will end the iteration.1639 *1640 * In the "buf" variant, "path" is a strbuf which will also be used as a1641 * scratch buffer, but restored to its original contents before1642 * the function returns.1643 */1644typedefinteach_loose_object_fn(const struct object_id *oid,1645const char*path,1646void*data);1647typedefinteach_loose_cruft_fn(const char*basename,1648const char*path,1649void*data);1650typedefinteach_loose_subdir_fn(unsigned int nr,1651const char*path,1652void*data);1653intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1654struct strbuf *path,1655 each_loose_object_fn obj_cb,1656 each_loose_cruft_fn cruft_cb,1657 each_loose_subdir_fn subdir_cb,1658void*data);1659intfor_each_loose_file_in_objdir(const char*path,1660 each_loose_object_fn obj_cb,1661 each_loose_cruft_fn cruft_cb,1662 each_loose_subdir_fn subdir_cb,1663void*data);1664intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1665 each_loose_object_fn obj_cb,1666 each_loose_cruft_fn cruft_cb,1667 each_loose_subdir_fn subdir_cb,1668void*data);16691670/*1671 * Iterate over loose objects in both the local1672 * repository and any alternates repositories (unless the1673 * LOCAL_ONLY flag is set).1674 */1675#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11676externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);16771678struct object_info {1679/* Request */1680enum object_type *typep;1681unsigned long*sizep;1682 off_t *disk_sizep;1683unsigned char*delta_base_sha1;1684struct strbuf *typename;1685void**contentp;16861687/* Response */1688enum{1689 OI_CACHED,1690 OI_LOOSE,1691 OI_PACKED,1692 OI_DBCACHED1693} whence;1694union{1695/*1696 * struct {1697 * ... Nothing to expose in this case1698 * } cached;1699 * struct {1700 * ... Nothing to expose in this case1701 * } loose;1702 */1703struct{1704struct packed_git *pack;1705 off_t offset;1706unsigned int is_delta;1707} packed;1708} u;1709};17101711/*1712 * Initializer for a "struct object_info" that wants no items. You may1713 * also memset() the memory to all-zeroes.1714 */1715#define OBJECT_INFO_INIT {NULL}17161717/* Invoke lookup_replace_object() on the given hash */1718#define OBJECT_INFO_LOOKUP_REPLACE 11719/* Allow reading from a loose object file of unknown/bogus type */1720#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21721/* Do not check cached storage */1722#define OBJECT_INFO_SKIP_CACHED 41723/* Do not retry packed storage after checking packed and loose storage */1724#define OBJECT_INFO_QUICK 81725externintsha1_object_info_extended(const unsigned char*,struct object_info *,unsigned flags);17261727/* Dumb servers support */1728externintupdate_server_info(int);17291730externconst char*get_log_output_encoding(void);1731externconst char*get_commit_output_encoding(void);17321733/*1734 * This is a hack for test programs like test-dump-untracked-cache to1735 * ensure that they do not modify the untracked cache when reading it.1736 * Do not use it otherwise!1737 */1738externint ignore_untracked_cache_config;17391740externintcommitter_ident_sufficiently_given(void);1741externintauthor_ident_sufficiently_given(void);17421743externconst char*git_commit_encoding;1744externconst char*git_log_output_encoding;1745externconst char*git_mailmap_file;1746externconst char*git_mailmap_blob;17471748/* IO helper functions */1749externvoidmaybe_flush_or_die(FILE*,const char*);1750__attribute__((format(printf,2,3)))1751externvoidfprintf_or_die(FILE*,const char*fmt, ...);17521753#define COPY_READ_ERROR (-2)1754#define COPY_WRITE_ERROR (-3)1755externintcopy_fd(int ifd,int ofd);1756externintcopy_file(const char*dst,const char*src,int mode);1757externintcopy_file_with_time(const char*dst,const char*src,int mode);17581759externvoidwrite_or_die(int fd,const void*buf,size_t count);1760externvoidfsync_or_die(int fd,const char*);17611762extern ssize_t read_in_full(int fd,void*buf,size_t count);1763extern ssize_t write_in_full(int fd,const void*buf,size_t count);1764extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17651766staticinline ssize_t write_str_in_full(int fd,const char*str)1767{1768returnwrite_in_full(fd, str,strlen(str));1769}17701771/**1772 * Open (and truncate) the file at path, write the contents of buf to it,1773 * and close it. Dies if any errors are encountered.1774 */1775externvoidwrite_file_buf(const char*path,const char*buf,size_t len);17761777/**1778 * Like write_file_buf(), but format the contents into a buffer first.1779 * Additionally, write_file() will append a newline if one is not already1780 * present, making it convenient to write text files:1781 *1782 * write_file(path, "counter: %d", ctr);1783 */1784__attribute__((format(printf,2,3)))1785externvoidwrite_file(const char*path,const char*fmt, ...);17861787/* pager.c */1788externvoidsetup_pager(void);1789externintpager_in_use(void);1790externint pager_use_color;1791externintterm_columns(void);1792externintdecimal_width(uintmax_t);1793externintcheck_pager_config(const char*cmd);1794externvoidprepare_pager_args(struct child_process *,const char*pager);17951796externconst char*editor_program;1797externconst char*askpass_program;1798externconst char*excludes_file;17991800/* base85 */1801intdecode_85(char*dst,const char*line,int linelen);1802voidencode_85(char*buf,const unsigned char*data,int bytes);18031804/* alloc.c */1805externvoid*alloc_blob_node(void);1806externvoid*alloc_tree_node(void);1807externvoid*alloc_commit_node(void);1808externvoid*alloc_tag_node(void);1809externvoid*alloc_object_node(void);1810externvoidalloc_report(void);1811externunsigned intalloc_commit_index(void);18121813/* pkt-line.c */1814voidpacket_trace_identity(const char*prog);18151816/* add */1817/*1818 * return 0 if success, 1 - if addition of a file failed and1819 * ADD_FILES_IGNORE_ERRORS was specified in flags1820 */1821intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);18221823/* diff.c */1824externint diff_auto_refresh_index;18251826/* match-trees.c */1827voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1828voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);18291830/*1831 * whitespace rules.1832 * used by both diff and apply1833 * last two digits are tab width1834 */1835#define WS_BLANK_AT_EOL 01001836#define WS_SPACE_BEFORE_TAB 02001837#define WS_INDENT_WITH_NON_TAB 04001838#define WS_CR_AT_EOL 010001839#define WS_BLANK_AT_EOF 020001840#define WS_TAB_IN_INDENT 040001841#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1842#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1843#define WS_TAB_WIDTH_MASK 0771844/* All WS_* -- when extended, adapt diff.c emit_symbol */1845#define WS_RULE_MASK 077771846externunsigned whitespace_rule_cfg;1847externunsignedwhitespace_rule(const char*);1848externunsignedparse_whitespace_rule(const char*);1849externunsignedws_check(const char*line,int len,unsigned ws_rule);1850externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1851externchar*whitespace_error_string(unsigned ws);1852externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1853externintws_blank_line(const char*line,int len,unsigned ws_rule);1854#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18551856/* ls-files */1857voidoverlay_tree_on_index(struct index_state *istate,1858const char*tree_name,const char*prefix);18591860char*alias_lookup(const char*alias);1861intsplit_cmdline(char*cmdline,const char***argv);1862/* Takes a negative value returned by split_cmdline */1863const char*split_cmdline_strerror(int cmdline_errno);18641865/* setup.c */1866struct startup_info {1867int have_repository;1868const char*prefix;1869};1870externstruct startup_info *startup_info;18711872/* merge.c */1873struct commit_list;1874inttry_merge_command(const char*strategy,size_t xopts_nr,1875const char**xopts,struct commit_list *common,1876const char*head_arg,struct commit_list *remotes);1877intcheckout_fast_forward(const struct object_id *from,1878const struct object_id *to,1879int overwrite_ignore);188018811882intsane_execvp(const char*file,char*const argv[]);18831884/*1885 * A struct to encapsulate the concept of whether a file has changed1886 * since we last checked it. This uses criteria similar to those used1887 * for the index.1888 */1889struct stat_validity {1890struct stat_data *sd;1891};18921893voidstat_validity_clear(struct stat_validity *sv);18941895/*1896 * Returns 1 if the path is a regular file (or a symlink to a regular1897 * file) and matches the saved stat_validity, 0 otherwise. A missing1898 * or inaccessible file is considered a match if the struct was just1899 * initialized, or if the previous update found an inaccessible file.1900 */1901intstat_validity_check(struct stat_validity *sv,const char*path);19021903/*1904 * Update the stat_validity from a file opened at descriptor fd. If1905 * the file is missing, inaccessible, or not a regular file, then1906 * future calls to stat_validity_check will match iff one of those1907 * conditions continues to be true.1908 */1909voidstat_validity_update(struct stat_validity *sv,int fd);19101911intversioncmp(const char*s1,const char*s2);1912voidsleep_millisec(int millisec);19131914/*1915 * Create a directory and (if share is nonzero) adjust its permissions1916 * according to the shared_repository setting. Only use this for1917 * directories under $GIT_DIR. Don't use it for working tree1918 * directories.1919 */1920voidsafe_create_dir(const char*dir,int share);19211922#endif/* CACHE_H */