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 14#include SHA1_HEADER 15#ifndef platform_SHA_CTX 16/* 17 * platform's underlying implementation of SHA-1; could be OpenSSL, 18 * blk_SHA, Apple CommonCrypto, etc... Note that including 19 * SHA1_HEADER may have already defined platform_SHA_CTX for our 20 * own implementations like block-sha1 and ppc-sha1, so we list 21 * the default for OpenSSL compatible SHA-1 implementations here. 22 */ 23#define platform_SHA_CTX SHA_CTX 24#define platform_SHA1_Init SHA1_Init 25#define platform_SHA1_Update SHA1_Update 26#define platform_SHA1_Final SHA1_Final 27#endif 28 29#define git_SHA_CTX platform_SHA_CTX 30#define git_SHA1_Init platform_SHA1_Init 31#define git_SHA1_Update platform_SHA1_Update 32#define git_SHA1_Final platform_SHA1_Final 33 34#ifdef SHA1_MAX_BLOCK_SIZE 35#include"compat/sha1-chunked.h" 36#undef git_SHA1_Update 37#define git_SHA1_Update git_SHA1_Update_Chunked 38#endif 39 40#include <zlib.h> 41typedefstruct git_zstream { 42 z_stream z; 43unsigned long avail_in; 44unsigned long avail_out; 45unsigned long total_in; 46unsigned long total_out; 47unsigned char*next_in; 48unsigned char*next_out; 49} git_zstream; 50 51voidgit_inflate_init(git_zstream *); 52voidgit_inflate_init_gzip_only(git_zstream *); 53voidgit_inflate_end(git_zstream *); 54intgit_inflate(git_zstream *,int flush); 55 56voidgit_deflate_init(git_zstream *,int level); 57voidgit_deflate_init_gzip(git_zstream *,int level); 58voidgit_deflate_init_raw(git_zstream *,int level); 59voidgit_deflate_end(git_zstream *); 60intgit_deflate_abort(git_zstream *); 61intgit_deflate_end_gently(git_zstream *); 62intgit_deflate(git_zstream *,int flush); 63unsigned longgit_deflate_bound(git_zstream *,unsigned long); 64 65/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 66#define GIT_SHA1_RAWSZ 20 67#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 68 69struct object_id { 70unsigned char hash[GIT_SHA1_RAWSZ]; 71}; 72 73#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 74#define DTYPE(de) ((de)->d_type) 75#else 76#undef DT_UNKNOWN 77#undef DT_DIR 78#undef DT_REG 79#undef DT_LNK 80#define DT_UNKNOWN 0 81#define DT_DIR 1 82#define DT_REG 2 83#define DT_LNK 3 84#define DTYPE(de) DT_UNKNOWN 85#endif 86 87/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 88#define S_IFINVALID 0030000 89 90/* 91 * A "directory link" is a link to another git directory. 92 * 93 * The value 0160000 is not normally a valid mode, and 94 * also just happens to be S_IFDIR + S_IFLNK 95 */ 96#define S_IFGITLINK 0160000 97#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 98 99/* 100 * Some mode bits are also used internally for computations. 101 * 102 * They *must* not overlap with any valid modes, and they *must* not be emitted 103 * to outside world - i.e. appear on disk or network. In other words, it's just 104 * temporary fields, which we internally use, but they have to stay in-house. 105 * 106 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 107 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 108 */ 109 110/* used internally in tree-diff */ 111#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 112 113 114/* 115 * Intensive research over the course of many years has shown that 116 * port 9418 is totally unused by anything else. Or 117 * 118 * Your search - "port 9418" - did not match any documents. 119 * 120 * as www.google.com puts it. 121 * 122 * This port has been properly assigned for git use by IANA: 123 * git (Assigned-9418) [I06-050728-0001]. 124 * 125 * git 9418/tcp git pack transfer service 126 * git 9418/udp git pack transfer service 127 * 128 * with Linus Torvalds <torvalds@osdl.org> as the point of 129 * contact. September 2005. 130 * 131 * See http://www.iana.org/assignments/port-numbers 132 */ 133#define DEFAULT_GIT_PORT 9418 134 135/* 136 * Basic data structures for the directory cache 137 */ 138 139#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 140struct cache_header { 141uint32_t hdr_signature; 142uint32_t hdr_version; 143uint32_t hdr_entries; 144}; 145 146#define INDEX_FORMAT_LB 2 147#define INDEX_FORMAT_UB 4 148 149/* 150 * The "cache_time" is just the low 32 bits of the 151 * time. It doesn't matter if it overflows - we only 152 * check it for equality in the 32 bits we save. 153 */ 154struct cache_time { 155uint32_t sec; 156uint32_t nsec; 157}; 158 159struct stat_data { 160struct cache_time sd_ctime; 161struct cache_time sd_mtime; 162unsigned int sd_dev; 163unsigned int sd_ino; 164unsigned int sd_uid; 165unsigned int sd_gid; 166unsigned int sd_size; 167}; 168 169struct cache_entry { 170struct hashmap_entry ent; 171struct stat_data ce_stat_data; 172unsigned int ce_mode; 173unsigned int ce_flags; 174unsigned int ce_namelen; 175unsigned int index;/* for link extension */ 176unsigned char sha1[20]; 177char name[FLEX_ARRAY];/* more */ 178}; 179 180#define CE_STAGEMASK (0x3000) 181#define CE_EXTENDED (0x4000) 182#define CE_VALID (0x8000) 183#define CE_STAGESHIFT 12 184 185/* 186 * Range 0xFFFF0FFF in ce_flags is divided into 187 * two parts: in-memory flags and on-disk ones. 188 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 189 * if you want to save a new flag, add it in 190 * CE_EXTENDED_FLAGS 191 * 192 * In-memory only flags 193 */ 194#define CE_UPDATE (1 << 16) 195#define CE_REMOVE (1 << 17) 196#define CE_UPTODATE (1 << 18) 197#define CE_ADDED (1 << 19) 198 199#define CE_HASHED (1 << 20) 200#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 201#define CE_CONFLICTED (1 << 23) 202 203#define CE_UNPACKED (1 << 24) 204#define CE_NEW_SKIP_WORKTREE (1 << 25) 205 206/* used to temporarily mark paths matched by pathspecs */ 207#define CE_MATCHED (1 << 26) 208 209#define CE_UPDATE_IN_BASE (1 << 27) 210#define CE_STRIP_NAME (1 << 28) 211 212/* 213 * Extended on-disk flags 214 */ 215#define CE_INTENT_TO_ADD (1 << 29) 216#define CE_SKIP_WORKTREE (1 << 30) 217/* CE_EXTENDED2 is for future extension */ 218#define CE_EXTENDED2 (1U << 31) 219 220#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 221 222/* 223 * Safeguard to avoid saving wrong flags: 224 * - CE_EXTENDED2 won't get saved until its semantic is known 225 * - Bits in 0x0000FFFF have been saved in ce_flags already 226 * - Bits in 0x003F0000 are currently in-memory flags 227 */ 228#if CE_EXTENDED_FLAGS & 0x803FFFFF 229#error"CE_EXTENDED_FLAGS out of range" 230#endif 231 232/* Forward structure decls */ 233struct pathspec; 234struct child_process; 235 236/* 237 * Copy the sha1 and stat state of a cache entry from one to 238 * another. But we never change the name, or the hash state! 239 */ 240staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 241const struct cache_entry *src) 242{ 243unsigned int state = dst->ce_flags & CE_HASHED; 244 245/* Don't copy hash chain and name */ 246memcpy(&dst->ce_stat_data, &src->ce_stat_data, 247offsetof(struct cache_entry, name) - 248offsetof(struct cache_entry, ce_stat_data)); 249 250/* Restore the hash state */ 251 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 252} 253 254staticinlineunsignedcreate_ce_flags(unsigned stage) 255{ 256return(stage << CE_STAGESHIFT); 257} 258 259#define ce_namelen(ce) ((ce)->ce_namelen) 260#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 261#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 262#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 263#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 264#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 265#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 266 267#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 268staticinlineunsigned intcreate_ce_mode(unsigned int mode) 269{ 270if(S_ISLNK(mode)) 271return S_IFLNK; 272if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 273return S_IFGITLINK; 274return S_IFREG |ce_permissions(mode); 275} 276staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 277unsigned int mode) 278{ 279externint trust_executable_bit, has_symlinks; 280if(!has_symlinks &&S_ISREG(mode) && 281 ce &&S_ISLNK(ce->ce_mode)) 282return ce->ce_mode; 283if(!trust_executable_bit &&S_ISREG(mode)) { 284if(ce &&S_ISREG(ce->ce_mode)) 285return ce->ce_mode; 286returncreate_ce_mode(0666); 287} 288returncreate_ce_mode(mode); 289} 290staticinlineintce_to_dtype(const struct cache_entry *ce) 291{ 292unsigned ce_mode =ntohl(ce->ce_mode); 293if(S_ISREG(ce_mode)) 294return DT_REG; 295else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 296return DT_DIR; 297else if(S_ISLNK(ce_mode)) 298return DT_LNK; 299else 300return DT_UNKNOWN; 301} 302staticinlineunsigned intcanon_mode(unsigned int mode) 303{ 304if(S_ISREG(mode)) 305return S_IFREG |ce_permissions(mode); 306if(S_ISLNK(mode)) 307return S_IFLNK; 308if(S_ISDIR(mode)) 309return S_IFDIR; 310return S_IFGITLINK; 311} 312 313#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 314 315#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 316#define CE_ENTRY_CHANGED (1 << 1) 317#define CE_ENTRY_REMOVED (1 << 2) 318#define CE_ENTRY_ADDED (1 << 3) 319#define RESOLVE_UNDO_CHANGED (1 << 4) 320#define CACHE_TREE_CHANGED (1 << 5) 321#define SPLIT_INDEX_ORDERED (1 << 6) 322#define UNTRACKED_CHANGED (1 << 7) 323 324struct split_index; 325struct untracked_cache; 326 327struct index_state { 328struct cache_entry **cache; 329unsigned int version; 330unsigned int cache_nr, cache_alloc, cache_changed; 331struct string_list *resolve_undo; 332struct cache_tree *cache_tree; 333struct split_index *split_index; 334struct cache_time timestamp; 335unsigned name_hash_initialized :1, 336 initialized :1; 337struct hashmap name_hash; 338struct hashmap dir_hash; 339unsigned char sha1[20]; 340struct untracked_cache *untracked; 341}; 342 343externstruct index_state the_index; 344 345/* Name hashing */ 346externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 347externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 348externvoidfree_name_hash(struct index_state *istate); 349 350 351#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 352#define active_cache (the_index.cache) 353#define active_nr (the_index.cache_nr) 354#define active_alloc (the_index.cache_alloc) 355#define active_cache_changed (the_index.cache_changed) 356#define active_cache_tree (the_index.cache_tree) 357 358#define read_cache() read_index(&the_index) 359#define read_cache_from(path) read_index_from(&the_index, (path)) 360#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 361#define is_cache_unborn() is_index_unborn(&the_index) 362#define read_cache_unmerged() read_index_unmerged(&the_index) 363#define discard_cache() discard_index(&the_index) 364#define unmerged_cache() unmerged_index(&the_index) 365#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 366#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 367#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 368#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 369#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 370#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 371#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 372#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 373#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 374#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 375#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 376#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 377#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 378#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 379#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 380#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 381#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 382#endif 383 384enum object_type { 385 OBJ_BAD = -1, 386 OBJ_NONE =0, 387 OBJ_COMMIT =1, 388 OBJ_TREE =2, 389 OBJ_BLOB =3, 390 OBJ_TAG =4, 391/* 5 for future expansion */ 392 OBJ_OFS_DELTA =6, 393 OBJ_REF_DELTA =7, 394 OBJ_ANY, 395 OBJ_MAX 396}; 397 398staticinlineenum object_type object_type(unsigned int mode) 399{ 400returnS_ISDIR(mode) ? OBJ_TREE : 401S_ISGITLINK(mode) ? OBJ_COMMIT : 402 OBJ_BLOB; 403} 404 405/* Double-check local_repo_env below if you add to this list. */ 406#define GIT_DIR_ENVIRONMENT"GIT_DIR" 407#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 408#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 409#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 410#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 411#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 412#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 413#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 414#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 415#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 416#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 417#define CONFIG_ENVIRONMENT"GIT_CONFIG" 418#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 419#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 420#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 421#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 422#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 423#define GITATTRIBUTES_FILE".gitattributes" 424#define INFOATTRIBUTES_FILE"info/attributes" 425#define ATTRIBUTE_MACRO_PREFIX"[attr]" 426#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 427#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 428#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 429#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 430#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 431#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 432#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 433#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 434#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 435 436/* 437 * This environment variable is expected to contain a boolean indicating 438 * whether we should or should not treat: 439 * 440 * GIT_DIR=foo.git git ... 441 * 442 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 443 * of this, but we use it internally to communicate to sub-processes that we 444 * are in a bare repo. If not set, defaults to true. 445 */ 446#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 447 448/* 449 * Repository-local GIT_* environment variables; these will be cleared 450 * when git spawns a sub-process that runs inside another repository. 451 * The array is NULL-terminated, which makes it easy to pass in the "env" 452 * parameter of a run-command invocation, or to do a simple walk. 453 */ 454externconst char*const local_repo_env[]; 455 456/* 457 * Returns true iff we have a configured git repository (either via 458 * setup_git_directory, or in the environment via $GIT_DIR). 459 */ 460inthave_git_dir(void); 461 462externint is_bare_repository_cfg; 463externintis_bare_repository(void); 464externintis_inside_git_dir(void); 465externchar*git_work_tree_cfg; 466externintis_inside_work_tree(void); 467externconst char*get_git_dir(void); 468externconst char*get_git_common_dir(void); 469externchar*get_object_directory(void); 470externchar*get_index_file(void); 471externchar*get_graft_file(void); 472externintset_git_dir(const char*path); 473externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 474externintget_common_dir(struct strbuf *sb,const char*gitdir); 475externconst char*get_git_namespace(void); 476externconst char*strip_namespace(const char*namespaced_ref); 477externconst char*get_git_work_tree(void); 478 479/* 480 * Return true if the given path is a git directory; note that this _just_ 481 * looks at the directory itself. If you want to know whether "foo/.git" 482 * is a repository, you must feed that path, not just "foo". 483 */ 484externintis_git_directory(const char*path); 485 486/* 487 * Return 1 if the given path is the root of a git repository or 488 * submodule, else 0. Will not return 1 for bare repositories with the 489 * exception of creating a bare repository in "foo/.git" and calling 490 * is_git_repository("foo"). 491 * 492 * If we run into read errors, we err on the side of saying "yes, it is", 493 * as we usually consider sub-repos precious, and would prefer to err on the 494 * side of not disrupting or deleting them. 495 */ 496externintis_nonbare_repository_dir(struct strbuf *path); 497 498#define READ_GITFILE_ERR_STAT_FAILED 1 499#define READ_GITFILE_ERR_NOT_A_FILE 2 500#define READ_GITFILE_ERR_OPEN_FAILED 3 501#define READ_GITFILE_ERR_READ_FAILED 4 502#define READ_GITFILE_ERR_INVALID_FORMAT 5 503#define READ_GITFILE_ERR_NO_PATH 6 504#define READ_GITFILE_ERR_NOT_A_REPO 7 505#define READ_GITFILE_ERR_TOO_LARGE 8 506externconst char*read_gitfile_gently(const char*path,int*return_error_code); 507#define read_gitfile(path) read_gitfile_gently((path), NULL) 508externconst char*resolve_gitdir(const char*suspect); 509externvoidset_git_work_tree(const char*tree); 510 511#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 512 513externconst char**get_pathspec(const char*prefix,const char**pathspec); 514externvoidsetup_work_tree(void); 515externconst char*setup_git_directory_gently(int*); 516externconst char*setup_git_directory(void); 517externchar*prefix_path(const char*prefix,int len,const char*path); 518externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 519externconst char*prefix_filename(const char*prefix,int len,const char*path); 520externintcheck_filename(const char*prefix,const char*name); 521externvoidverify_filename(const char*prefix, 522const char*name, 523int diagnose_misspelt_rev); 524externvoidverify_non_filename(const char*prefix,const char*name); 525externintpath_inside_repo(const char*prefix,const char*path); 526 527#define INIT_DB_QUIET 0x0001 528#define INIT_DB_EXIST_OK 0x0002 529 530externintinit_db(const char*git_dir,const char*real_git_dir, 531const char*template_dir,unsigned int flags); 532 533externvoidsanitize_stdfds(void); 534externintdaemonize(void); 535 536#define alloc_nr(x) (((x)+16)*3/2) 537 538/* 539 * Realloc the buffer pointed at by variable 'x' so that it can hold 540 * at least 'nr' entries; the number of entries currently allocated 541 * is 'alloc', using the standard growing factor alloc_nr() macro. 542 * 543 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 544 */ 545#define ALLOC_GROW(x, nr, alloc) \ 546 do { \ 547 if ((nr) > alloc) { \ 548 if (alloc_nr(alloc) < (nr)) \ 549 alloc = (nr); \ 550 else \ 551 alloc = alloc_nr(alloc); \ 552 REALLOC_ARRAY(x, alloc); \ 553 } \ 554 } while (0) 555 556/* Initialize and use the cache information */ 557struct lock_file; 558externintread_index(struct index_state *); 559externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 560externintdo_read_index(struct index_state *istate,const char*path, 561int must_exist);/* for testting only! */ 562externintread_index_from(struct index_state *,const char*path); 563externintis_index_unborn(struct index_state *); 564externintread_index_unmerged(struct index_state *); 565#define COMMIT_LOCK (1 << 0) 566#define CLOSE_LOCK (1 << 1) 567externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 568externintdiscard_index(struct index_state *); 569externintunmerged_index(const struct index_state *); 570externintverify_path(const char*path); 571externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 572externvoidadjust_dirname_case(struct index_state *istate,char*name); 573externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 574externintindex_name_pos(const struct index_state *,const char*name,int namelen); 575#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 576#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 577#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 578#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 579#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 580#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 581externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 582externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 583externintremove_index_entry_at(struct index_state *,int pos); 584externvoidremove_marked_cache_entries(struct index_state *istate); 585externintremove_file_from_index(struct index_state *,const char*path); 586#define ADD_CACHE_VERBOSE 1 587#define ADD_CACHE_PRETEND 2 588#define ADD_CACHE_IGNORE_ERRORS 4 589#define ADD_CACHE_IGNORE_REMOVAL 8 590#define ADD_CACHE_INTENT 16 591externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 592externintadd_file_to_index(struct index_state *,const char*path,int flags); 593externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 594externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 595externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 596externintindex_name_is_other(const struct index_state *,const char*,int); 597externvoid*read_blob_data_from_index(struct index_state *,const char*,unsigned long*); 598 599/* do stat comparison even if CE_VALID is true */ 600#define CE_MATCH_IGNORE_VALID 01 601/* do not check the contents but report dirty on racily-clean entries */ 602#define CE_MATCH_RACY_IS_DIRTY 02 603/* do stat comparison even if CE_SKIP_WORKTREE is true */ 604#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 605/* ignore non-existent files during stat update */ 606#define CE_MATCH_IGNORE_MISSING 0x08 607/* enable stat refresh */ 608#define CE_MATCH_REFRESH 0x10 609externintie_match_stat(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 610externintie_modified(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 611 612#define HASH_WRITE_OBJECT 1 613#define HASH_FORMAT_CHECK 2 614externintindex_fd(unsigned char*sha1,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 615externintindex_path(unsigned char*sha1,const char*path,struct stat *st,unsigned flags); 616 617/* 618 * Record to sd the data from st that we use to check whether a file 619 * might have changed. 620 */ 621externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 622 623/* 624 * Return 0 if st is consistent with a file not having been changed 625 * since sd was filled. If there are differences, return a 626 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 627 * INODE_CHANGED, and DATA_CHANGED. 628 */ 629externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 630externintmatch_stat_data_racy(const struct index_state *istate, 631const struct stat_data *sd,struct stat *st); 632 633externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 634 635#define REFRESH_REALLY 0x0001/* ignore_valid */ 636#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 637#define REFRESH_QUIET 0x0004/* be quiet about it */ 638#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 639#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 640#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 641externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 642 643externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 644 645externinthold_locked_index(struct lock_file *,int); 646externvoidset_alternate_index_output(const char*); 647 648/* Environment bits from configuration mechanism */ 649externint trust_executable_bit; 650externint trust_ctime; 651externint check_stat; 652externint quote_path_fully; 653externint has_symlinks; 654externint minimum_abbrev, default_abbrev; 655externint ignore_case; 656externint assume_unchanged; 657externint prefer_symlink_refs; 658externint log_all_ref_updates; 659externint warn_ambiguous_refs; 660externint warn_on_object_refname_ambiguity; 661externconst char*apply_default_whitespace; 662externconst char*apply_default_ignorewhitespace; 663externconst char*git_attributes_file; 664externint zlib_compression_level; 665externint core_compression_level; 666externint core_compression_seen; 667externsize_t packed_git_window_size; 668externsize_t packed_git_limit; 669externsize_t delta_base_cache_limit; 670externunsigned long big_file_threshold; 671externunsigned long pack_size_limit_cfg; 672 673/* 674 * Accessors for the core.sharedrepository config which lazy-load the value 675 * from the config (if not already set). The "reset" function can be 676 * used to unset "set" or cached value, meaning that the value will be loaded 677 * fresh from the config file on the next call to get_shared_repository(). 678 */ 679voidset_shared_repository(int value); 680intget_shared_repository(void); 681voidreset_shared_repository(void); 682 683/* 684 * Do replace refs need to be checked this run? This variable is 685 * initialized to true unless --no-replace-object is used or 686 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 687 * commands that do not want replace references to be active. As an 688 * optimization it is also set to false if replace references have 689 * been sought but there were none. 690 */ 691externint check_replace_refs; 692externchar*git_replace_ref_base; 693 694externint fsync_object_files; 695externint core_preload_index; 696externint core_apply_sparse_checkout; 697externint precomposed_unicode; 698externint protect_hfs; 699externint protect_ntfs; 700externint git_db_env, git_index_env, git_graft_env, git_common_dir_env; 701 702/* 703 * Include broken refs in all ref iterations, which will 704 * generally choke dangerous operations rather than letting 705 * them silently proceed without taking the broken ref into 706 * account. 707 */ 708externint ref_paranoia; 709 710/* 711 * The character that begins a commented line in user-editable file 712 * that is subject to stripspace. 713 */ 714externchar comment_line_char; 715externint auto_comment_line_char; 716 717/* Windows only */ 718enum hide_dotfiles_type { 719 HIDE_DOTFILES_FALSE =0, 720 HIDE_DOTFILES_TRUE, 721 HIDE_DOTFILES_DOTGITONLY 722}; 723externenum hide_dotfiles_type hide_dotfiles; 724 725enum branch_track { 726 BRANCH_TRACK_UNSPECIFIED = -1, 727 BRANCH_TRACK_NEVER =0, 728 BRANCH_TRACK_REMOTE, 729 BRANCH_TRACK_ALWAYS, 730 BRANCH_TRACK_EXPLICIT, 731 BRANCH_TRACK_OVERRIDE 732}; 733 734enum rebase_setup_type { 735 AUTOREBASE_NEVER =0, 736 AUTOREBASE_LOCAL, 737 AUTOREBASE_REMOTE, 738 AUTOREBASE_ALWAYS 739}; 740 741enum push_default_type { 742 PUSH_DEFAULT_NOTHING =0, 743 PUSH_DEFAULT_MATCHING, 744 PUSH_DEFAULT_SIMPLE, 745 PUSH_DEFAULT_UPSTREAM, 746 PUSH_DEFAULT_CURRENT, 747 PUSH_DEFAULT_UNSPECIFIED 748}; 749 750externenum branch_track git_branch_track; 751externenum rebase_setup_type autorebase; 752externenum push_default_type push_default; 753 754enum object_creation_mode { 755 OBJECT_CREATION_USES_HARDLINKS =0, 756 OBJECT_CREATION_USES_RENAMES =1 757}; 758 759externenum object_creation_mode object_creation_mode; 760 761externchar*notes_ref_name; 762 763externint grafts_replace_parents; 764 765/* 766 * GIT_REPO_VERSION is the version we write by default. The 767 * _READ variant is the highest number we know how to 768 * handle. 769 */ 770#define GIT_REPO_VERSION 0 771#define GIT_REPO_VERSION_READ 1 772externint repository_format_precious_objects; 773 774struct repository_format { 775int version; 776int precious_objects; 777int is_bare; 778char*work_tree; 779struct string_list unknown_extensions; 780}; 781 782/* 783 * Read the repository format characteristics from the config file "path" into 784 * "format" struct. Returns the numeric version. On error, -1 is returned, 785 * format->version is set to -1, and all other fields in the struct are 786 * undefined. 787 */ 788intread_repository_format(struct repository_format *format,const char*path); 789 790/* 791 * Verify that the repository described by repository_format is something we 792 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 793 * any errors encountered. 794 */ 795intverify_repository_format(const struct repository_format *format, 796struct strbuf *err); 797 798/* 799 * Check the repository format version in the path found in get_git_dir(), 800 * and die if it is a version we don't understand. Generally one would 801 * set_git_dir() before calling this, and use it only for "are we in a valid 802 * repo?". 803 */ 804externvoidcheck_repository_format(void); 805 806#define MTIME_CHANGED 0x0001 807#define CTIME_CHANGED 0x0002 808#define OWNER_CHANGED 0x0004 809#define MODE_CHANGED 0x0008 810#define INODE_CHANGED 0x0010 811#define DATA_CHANGED 0x0020 812#define TYPE_CHANGED 0x0040 813 814/* 815 * Return a statically allocated filename, either generically (mkpath), in 816 * the repository directory (git_path), or in a submodule's repository 817 * directory (git_path_submodule). In all cases, note that the result 818 * may be overwritten by another call to _any_ of the functions. Consider 819 * using the safer "dup" or "strbuf" formats below (in some cases, the 820 * unsafe versions have already been removed). 821 */ 822externconst char*mkpath(const char*fmt, ...)__attribute__((format(printf,1,2))); 823externconst char*git_path(const char*fmt, ...)__attribute__((format(printf,1,2))); 824 825externchar*mksnpath(char*buf,size_t n,const char*fmt, ...) 826__attribute__((format(printf,3,4))); 827externvoidstrbuf_git_path(struct strbuf *sb,const char*fmt, ...) 828__attribute__((format(printf,2,3))); 829externchar*git_path_buf(struct strbuf *buf,const char*fmt, ...) 830__attribute__((format(printf,2,3))); 831externvoidstrbuf_git_path_submodule(struct strbuf *sb,const char*path, 832const char*fmt, ...) 833__attribute__((format(printf,3,4))); 834externchar*git_pathdup(const char*fmt, ...) 835__attribute__((format(printf,1,2))); 836externchar*mkpathdup(const char*fmt, ...) 837__attribute__((format(printf,1,2))); 838externchar*git_pathdup_submodule(const char*path,const char*fmt, ...) 839__attribute__((format(printf,2,3))); 840 841externvoidreport_linked_checkout_garbage(void); 842 843/* 844 * You can define a static memoized git path like: 845 * 846 * static GIT_PATH_FUNC(git_path_foo, "FOO"); 847 * 848 * or use one of the global ones below. 849 */ 850#define GIT_PATH_FUNC(func, filename) \ 851 const char *func(void) \ 852 { \ 853 static char *ret; \ 854 if (!ret) \ 855 ret = git_pathdup(filename); \ 856 return ret; \ 857 } 858 859const char*git_path_cherry_pick_head(void); 860const char*git_path_revert_head(void); 861const char*git_path_squash_msg(void); 862const char*git_path_merge_msg(void); 863const char*git_path_merge_rr(void); 864const char*git_path_merge_mode(void); 865const char*git_path_merge_head(void); 866const char*git_path_fetch_head(void); 867const char*git_path_shallow(void); 868 869/* 870 * Return the name of the file in the local object database that would 871 * be used to store a loose object with the specified sha1. The 872 * return value is a pointer to a statically allocated buffer that is 873 * overwritten each time the function is called. 874 */ 875externconst char*sha1_file_name(const unsigned char*sha1); 876 877/* 878 * Return the name of the (local) packfile with the specified sha1 in 879 * its name. The return value is a pointer to memory that is 880 * overwritten each time this function is called. 881 */ 882externchar*sha1_pack_name(const unsigned char*sha1); 883 884/* 885 * Return the name of the (local) pack index file with the specified 886 * sha1 in its name. The return value is a pointer to memory that is 887 * overwritten each time this function is called. 888 */ 889externchar*sha1_pack_index_name(const unsigned char*sha1); 890 891/* 892 * Return an abbreviated sha1 unique within this repository's object database. 893 * The result will be at least `len` characters long, and will be NUL 894 * terminated. 895 * 896 * The non-`_r` version returns a static buffer which will be overwritten by 897 * subsequent calls. 898 * 899 * The `_r` variant writes to a buffer supplied by the caller, which must be at 900 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes 901 * written (excluding the NUL terminator). 902 * 903 * Note that while this version avoids the static buffer, it is not fully 904 * reentrant, as it calls into other non-reentrant git code. 905 */ 906externconst char*find_unique_abbrev(const unsigned char*sha1,int len); 907externintfind_unique_abbrev_r(char*hex,const unsigned char*sha1,int len); 908 909externconst unsigned char null_sha1[GIT_SHA1_RAWSZ]; 910externconst struct object_id null_oid; 911 912staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 913{ 914int i; 915 916for(i =0; i < GIT_SHA1_RAWSZ; i++, sha1++, sha2++) { 917if(*sha1 != *sha2) 918return*sha1 - *sha2; 919} 920 921return0; 922} 923 924staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 925{ 926returnhashcmp(oid1->hash, oid2->hash); 927} 928 929staticinlineintis_null_sha1(const unsigned char*sha1) 930{ 931return!hashcmp(sha1, null_sha1); 932} 933 934staticinlineintis_null_oid(const struct object_id *oid) 935{ 936return!hashcmp(oid->hash, null_sha1); 937} 938 939staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 940{ 941memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 942} 943 944staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 945{ 946hashcpy(dst->hash, src->hash); 947} 948 949staticinlinevoidhashclr(unsigned char*hash) 950{ 951memset(hash,0, GIT_SHA1_RAWSZ); 952} 953 954staticinlinevoidoidclr(struct object_id *oid) 955{ 956hashclr(oid->hash); 957} 958 959 960#define EMPTY_TREE_SHA1_HEX \ 961"4b825dc642cb6eb9a060e54bf8d69288fbee4904" 962#define EMPTY_TREE_SHA1_BIN_LITERAL \ 963"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \ 964"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04" 965#define EMPTY_TREE_SHA1_BIN \ 966 ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL) 967 968#define EMPTY_BLOB_SHA1_HEX \ 969"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391" 970#define EMPTY_BLOB_SHA1_BIN_LITERAL \ 971"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \ 972"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91" 973#define EMPTY_BLOB_SHA1_BIN \ 974 ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL) 975 976staticinlineintis_empty_blob_sha1(const unsigned char*sha1) 977{ 978return!hashcmp(sha1, EMPTY_BLOB_SHA1_BIN); 979} 980 981intgit_mkstemp(char*path,size_t n,const char*template); 982 983/* set default permissions by passing mode arguments to open(2) */ 984intgit_mkstemps_mode(char*pattern,int suffix_len,int mode); 985intgit_mkstemp_mode(char*pattern,int mode); 986 987/* 988 * NOTE NOTE NOTE!! 989 * 990 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must 991 * not be changed. Old repositories have core.sharedrepository written in 992 * numeric format, and therefore these values are preserved for compatibility 993 * reasons. 994 */ 995enum sharedrepo { 996 PERM_UMASK =0, 997 OLD_PERM_GROUP =1, 998 OLD_PERM_EVERYBODY =2, 999 PERM_GROUP =0660,1000 PERM_EVERYBODY =06641001};1002intgit_config_perm(const char*var,const char*value);1003intadjust_shared_perm(const char*path);10041005/*1006 * Create the directory containing the named path, using care to be1007 * somewhat safe against races. Return one of the scld_error values1008 * to indicate success/failure.1009 *1010 * SCLD_VANISHED indicates that one of the ancestor directories of the1011 * path existed at one point during the function call and then1012 * suddenly vanished, probably because another process pruned the1013 * directory while we were working. To be robust against this kind of1014 * race, callers might want to try invoking the function again when it1015 * returns SCLD_VANISHED.1016 */1017enum scld_error {1018 SCLD_OK =0,1019 SCLD_FAILED = -1,1020 SCLD_PERMS = -2,1021 SCLD_EXISTS = -3,1022 SCLD_VANISHED = -41023};1024enum scld_error safe_create_leading_directories(char*path);1025enum scld_error safe_create_leading_directories_const(const char*path);10261027intmkdir_in_gitdir(const char*path);1028externchar*expand_user_path(const char*path);1029const char*enter_repo(const char*path,int strict);1030staticinlineintis_absolute_path(const char*path)1031{1032returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1033}1034intis_directory(const char*);1035const char*real_path(const char*path);1036const char*real_path_if_valid(const char*path);1037const char*absolute_path(const char*path);1038const char*remove_leading_path(const char*in,const char*prefix);1039const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1040intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1041intnormalize_path_copy(char*dst,const char*src);1042intlongest_ancestor_length(const char*path,struct string_list *prefixes);1043char*strip_path_suffix(const char*path,const char*suffix);1044intdaemon_avoid_alias(const char*path);1045externintis_ntfs_dotgit(const char*name);10461047/**1048 * Return a newly allocated string with the evaluation of1049 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1050 * "$HOME/.config/git/$filename". Return NULL upon error.1051 */1052externchar*xdg_config_home(const char*filename);10531054/* object replacement */1055#define LOOKUP_REPLACE_OBJECT 11056#define LOOKUP_UNKNOWN_OBJECT 21057externvoid*read_sha1_file_extended(const unsigned char*sha1,enum object_type *type,unsigned long*size,unsigned flag);1058staticinlinevoid*read_sha1_file(const unsigned char*sha1,enum object_type *type,unsigned long*size)1059{1060returnread_sha1_file_extended(sha1, type, size, LOOKUP_REPLACE_OBJECT);1061}10621063/*1064 * This internal function is only declared here for the benefit of1065 * lookup_replace_object(). Please do not call it directly.1066 */1067externconst unsigned char*do_lookup_replace_object(const unsigned char*sha1);10681069/*1070 * If object sha1 should be replaced, return the replacement object's1071 * name (replaced recursively, if necessary). The return value is1072 * either sha1 or a pointer to a permanently-allocated value. When1073 * object replacement is suppressed, always return sha1.1074 */1075staticinlineconst unsigned char*lookup_replace_object(const unsigned char*sha1)1076{1077if(!check_replace_refs)1078return sha1;1079returndo_lookup_replace_object(sha1);1080}10811082staticinlineconst unsigned char*lookup_replace_object_extended(const unsigned char*sha1,unsigned flag)1083{1084if(!(flag & LOOKUP_REPLACE_OBJECT))1085return sha1;1086returnlookup_replace_object(sha1);1087}10881089/* Read and unpack a sha1 file into memory, write memory to a sha1 file */1090externintsha1_object_info(const unsigned char*,unsigned long*);1091externinthash_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*sha1);1092externintwrite_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*return_sha1);1093externinthash_sha1_file_literally(const void*buf,unsigned long len,const char*type,unsigned char*sha1,unsigned flags);1094externintpretend_sha1_file(void*,unsigned long,enum object_type,unsigned char*);1095externintforce_object_loose(const unsigned char*sha1,time_t mtime);1096externintgit_open_noatime(const char*name);1097externvoid*map_sha1_file(const unsigned char*sha1,unsigned long*size);1098externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1099externintparse_sha1_header(const char*hdr,unsigned long*sizep);11001101/* global flag to enable extra checks when accessing packed objects */1102externint do_check_packed_object_crc;11031104externintcheck_sha1_signature(const unsigned char*sha1,void*buf,unsigned long size,const char*type);11051106externintfinalize_object_file(const char*tmpfile,const char*filename);11071108externinthas_sha1_pack(const unsigned char*sha1);11091110/*1111 * Return true iff we have an object named sha1, whether local or in1112 * an alternate object database, and whether packed or loose. This1113 * function does not respect replace references.1114 *1115 * If the QUICK flag is set, do not re-check the pack directory1116 * when we cannot find the object (this means we may give a false1117 * negative answer if another process is simultaneously repacking).1118 */1119#define HAS_SHA1_QUICK 0x11120externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1121staticinlineinthas_sha1_file(const unsigned char*sha1)1122{1123returnhas_sha1_file_with_flags(sha1,0);1124}11251126/* Same as the above, except for struct object_id. */1127externinthas_object_file(const struct object_id *oid);11281129/*1130 * Return true iff an alternate object database has a loose object1131 * with the specified name. This function does not respect replace1132 * references.1133 */1134externinthas_loose_object_nonlocal(const unsigned char*sha1);11351136externinthas_pack_index(const unsigned char*sha1);11371138externvoidassert_sha1_type(const unsigned char*sha1,enum object_type expect);11391140externconst signed char hexval_table[256];1141staticinlineunsigned inthexval(unsigned char c)1142{1143return hexval_table[c];1144}11451146/* Convert to/from hex/sha1 representation */1147#define MINIMUM_ABBREV minimum_abbrev1148#define DEFAULT_ABBREV default_abbrev11491150struct object_context {1151unsigned char tree[20];1152char path[PATH_MAX];1153unsigned mode;1154/*1155 * symlink_path is only used by get_tree_entry_follow_symlinks,1156 * and only for symlinks that point outside the repository.1157 */1158struct strbuf symlink_path;1159};11601161#define GET_SHA1_QUIETLY 011162#define GET_SHA1_COMMIT 021163#define GET_SHA1_COMMITTISH 041164#define GET_SHA1_TREE 0101165#define GET_SHA1_TREEISH 0201166#define GET_SHA1_BLOB 0401167#define GET_SHA1_FOLLOW_SYMLINKS 01001168#define GET_SHA1_ONLY_TO_DIE 0400011691170externintget_sha1(const char*str,unsigned char*sha1);1171externintget_sha1_commit(const char*str,unsigned char*sha1);1172externintget_sha1_committish(const char*str,unsigned char*sha1);1173externintget_sha1_tree(const char*str,unsigned char*sha1);1174externintget_sha1_treeish(const char*str,unsigned char*sha1);1175externintget_sha1_blob(const char*str,unsigned char*sha1);1176externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1177externintget_sha1_with_context(const char*str,unsigned flags,unsigned char*sha1,struct object_context *orc);11781179typedefinteach_abbrev_fn(const unsigned char*sha1,void*);1180externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);11811182/*1183 * Try to read a SHA1 in hexadecimal format from the 40 characters1184 * starting at hex. Write the 20-byte result to sha1 in binary form.1185 * Return 0 on success. Reading stops if a NUL is encountered in the1186 * input, so it is safe to pass this function an arbitrary1187 * null-terminated string.1188 */1189externintget_sha1_hex(const char*hex,unsigned char*sha1);1190externintget_oid_hex(const char*hex,struct object_id *sha1);11911192/*1193 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1194 * and writes the NUL-terminated output to the buffer `out`, which must be at1195 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1196 * convenience.1197 *1198 * The non-`_r` variant returns a static buffer, but uses a ring of 41199 * buffers, making it safe to make multiple calls for a single statement, like:1200 *1201 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1202 */1203externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1204externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1205externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */12061207externintinterpret_branch_name(const char*str,int len,struct strbuf *);1208externintget_sha1_mb(const char*str,unsigned char*sha1);12091210externintvalidate_headref(const char*ref);12111212externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1213externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1214externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1215externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);12161217externvoid*read_object_with_reference(const unsigned char*sha1,1218const char*required_type,1219unsigned long*size,1220unsigned char*sha1_ret);12211222externstruct object *peel_to_type(const char*name,int namelen,1223struct object *o,enum object_type);12241225struct date_mode {1226enum date_mode_type {1227 DATE_NORMAL =0,1228 DATE_RELATIVE,1229 DATE_SHORT,1230 DATE_ISO8601,1231 DATE_ISO8601_STRICT,1232 DATE_RFC2822,1233 DATE_STRFTIME,1234 DATE_RAW1235} type;1236const char*strftime_fmt;1237int local;1238};12391240/*1241 * Convenience helper for passing a constant type, like:1242 *1243 * show_date(t, tz, DATE_MODE(NORMAL));1244 */1245#define DATE_MODE(t) date_mode_from_type(DATE_##t)1246struct date_mode *date_mode_from_type(enum date_mode_type type);12471248const char*show_date(unsigned long time,int timezone,const struct date_mode *mode);1249voidshow_date_relative(unsigned long time,int tz,const struct timeval *now,1250struct strbuf *timebuf);1251intparse_date(const char*date,struct strbuf *out);1252intparse_date_basic(const char*date,unsigned long*timestamp,int*offset);1253intparse_expiry_date(const char*date,unsigned long*timestamp);1254voiddatestamp(struct strbuf *out);1255#define approxidate(s) approxidate_careful((s), NULL)1256unsigned longapproxidate_careful(const char*,int*);1257unsigned longapproxidate_relative(const char*date,const struct timeval *now);1258voidparse_date_format(const char*format,struct date_mode *mode);1259intdate_overflows(unsigned long date);12601261#define IDENT_STRICT 11262#define IDENT_NO_DATE 21263#define IDENT_NO_NAME 41264externconst char*git_author_info(int);1265externconst char*git_committer_info(int);1266externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1267externconst char*fmt_name(const char*name,const char*email);1268externconst char*ident_default_name(void);1269externconst char*ident_default_email(void);1270externconst char*git_editor(void);1271externconst char*git_pager(int stdout_is_tty);1272externintgit_ident_config(const char*,const char*,void*);12731274struct ident_split {1275const char*name_begin;1276const char*name_end;1277const char*mail_begin;1278const char*mail_end;1279const char*date_begin;1280const char*date_end;1281const char*tz_begin;1282const char*tz_end;1283};1284/*1285 * Signals an success with 0, but time part of the result may be NULL1286 * if the input lacks timestamp and zone1287 */1288externintsplit_ident_line(struct ident_split *,const char*,int);12891290/*1291 * Like show_date, but pull the timestamp and tz parameters from1292 * the ident_split. It will also sanity-check the values and produce1293 * a well-known sentinel date if they appear bogus.1294 */1295const char*show_ident_date(const struct ident_split *id,1296const struct date_mode *mode);12971298/*1299 * Compare split idents for equality or strict ordering. Note that we1300 * compare only the ident part of the line, ignoring any timestamp.1301 *1302 * Because there are two fields, we must choose one as the primary key; we1303 * currently arbitrarily pick the email.1304 */1305externintident_cmp(const struct ident_split *,const struct ident_split *);13061307struct checkout {1308struct index_state *istate;1309const char*base_dir;1310int base_dir_len;1311unsigned force:1,1312 quiet:1,1313 not_new:1,1314 refresh_cache:1;1315};13161317#define TEMPORARY_FILENAME_LENGTH 251318externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);13191320struct cache_def {1321struct strbuf path;1322int flags;1323int track_flags;1324int prefix_len_stat_func;1325};1326#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1327staticinlinevoidcache_def_clear(struct cache_def *cache)1328{1329strbuf_release(&cache->path);1330}13311332externinthas_symlink_leading_path(const char*name,int len);1333externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1334externintcheck_leading_path(const char*name,int len);1335externinthas_dirs_only_path(const char*name,int len,int prefix_len);1336externvoidschedule_dir_for_removal(const char*name,int len);1337externvoidremove_scheduled_dirs(void);13381339externstruct alternate_object_database {1340struct alternate_object_database *next;1341char*name;1342char base[FLEX_ARRAY];/* more */1343} *alt_odb_list;1344externvoidprepare_alt_odb(void);1345externvoidread_info_alternates(const char* relative_base,int depth);1346externvoidadd_to_alternates_file(const char*reference);1347typedefintalt_odb_fn(struct alternate_object_database *,void*);1348externintforeach_alt_odb(alt_odb_fn,void*);13491350struct pack_window {1351struct pack_window *next;1352unsigned char*base;1353 off_t offset;1354size_t len;1355unsigned int last_used;1356unsigned int inuse_cnt;1357};13581359externstruct packed_git {1360struct packed_git *next;1361struct pack_window *windows;1362 off_t pack_size;1363const void*index_data;1364size_t index_size;1365uint32_t num_objects;1366uint32_t num_bad_objects;1367unsigned char*bad_object_sha1;1368int index_version;1369time_t mtime;1370int pack_fd;1371unsigned pack_local:1,1372 pack_keep:1,1373 freshened:1,1374 do_not_close:1;1375unsigned char sha1[20];1376struct revindex_entry *revindex;1377/* something like ".git/objects/pack/xxxxx.pack" */1378char pack_name[FLEX_ARRAY];/* more */1379} *packed_git;13801381struct pack_entry {1382 off_t offset;1383unsigned char sha1[20];1384struct packed_git *p;1385};13861387externstruct packed_git *parse_pack_index(unsigned char*sha1,const char*idx_path);13881389/* A hook to report invalid files in pack directory */1390#define PACKDIR_FILE_PACK 11391#define PACKDIR_FILE_IDX 21392#define PACKDIR_FILE_GARBAGE 41393externvoid(*report_garbage)(unsigned seen_bits,const char*path);13941395externvoidprepare_packed_git(void);1396externvoidreprepare_packed_git(void);1397externvoidinstall_packed_git(struct packed_git *pack);13981399externstruct packed_git *find_sha1_pack(const unsigned char*sha1,1400struct packed_git *packs);14011402externvoidpack_report(void);14031404/*1405 * mmap the index file for the specified packfile (if it is not1406 * already mmapped). Return 0 on success.1407 */1408externintopen_pack_index(struct packed_git *);14091410/*1411 * munmap the index file for the specified packfile (if it is1412 * currently mmapped).1413 */1414externvoidclose_pack_index(struct packed_git *);14151416externunsigned char*use_pack(struct packed_git *,struct pack_window **, off_t,unsigned long*);1417externvoidclose_pack_windows(struct packed_git *);1418externvoidclose_all_packs(void);1419externvoidunuse_pack(struct pack_window **);1420externvoidfree_pack_by_name(const char*);1421externvoidclear_delta_base_cache(void);1422externstruct packed_git *add_packed_git(const char*path,size_t path_len,int local);14231424/*1425 * Make sure that a pointer access into an mmap'd index file is within bounds,1426 * and can provide at least 8 bytes of data.1427 *1428 * Note that this is only necessary for variable-length segments of the file1429 * (like the 64-bit extended offset table), as we compare the size to the1430 * fixed-length parts when we open the file.1431 */1432externvoidcheck_pack_index_ptr(const struct packed_git *p,const void*ptr);14331434/*1435 * Return the SHA-1 of the nth object within the specified packfile.1436 * Open the index if it is not already open. The return value points1437 * at the SHA-1 within the mmapped index. Return NULL if there is an1438 * error.1439 */1440externconst unsigned char*nth_packed_object_sha1(struct packed_git *,uint32_t n);14411442/*1443 * Return the offset of the nth object within the specified packfile.1444 * The index must already be opened.1445 */1446extern off_t nth_packed_object_offset(const struct packed_git *,uint32_t n);14471448/*1449 * If the object named sha1 is present in the specified packfile,1450 * return its offset within the packfile; otherwise, return 0.1451 */1452extern off_t find_pack_entry_one(const unsigned char*sha1,struct packed_git *);14531454externintis_pack_valid(struct packed_git *);1455externvoid*unpack_entry(struct packed_git *, off_t,enum object_type *,unsigned long*);1456externunsigned longunpack_object_header_buffer(const unsigned char*buf,unsigned long len,enum object_type *type,unsigned long*sizep);1457externunsigned longget_size_from_delta(struct packed_git *,struct pack_window **, off_t);1458externintunpack_object_header(struct packed_git *,struct pack_window **, off_t *,unsigned long*);14591460/*1461 * Iterate over the files in the loose-object parts of the object1462 * directory "path", triggering the following callbacks:1463 *1464 * - loose_object is called for each loose object we find.1465 *1466 * - loose_cruft is called for any files that do not appear to be1467 * loose objects. Note that we only look in the loose object1468 * directories "objects/[0-9a-f]{2}/", so we will not report1469 * "objects/foobar" as cruft.1470 *1471 * - loose_subdir is called for each top-level hashed subdirectory1472 * of the object directory (e.g., "$OBJDIR/f0"). It is called1473 * after the objects in the directory are processed.1474 *1475 * Any callback that is NULL will be ignored. Callbacks returning non-zero1476 * will end the iteration.1477 *1478 * In the "buf" variant, "path" is a strbuf which will also be used as a1479 * scratch buffer, but restored to its original contents before1480 * the function returns.1481 */1482typedefinteach_loose_object_fn(const unsigned char*sha1,1483const char*path,1484void*data);1485typedefinteach_loose_cruft_fn(const char*basename,1486const char*path,1487void*data);1488typedefinteach_loose_subdir_fn(int nr,1489const char*path,1490void*data);1491intfor_each_loose_file_in_objdir(const char*path,1492 each_loose_object_fn obj_cb,1493 each_loose_cruft_fn cruft_cb,1494 each_loose_subdir_fn subdir_cb,1495void*data);1496intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1497 each_loose_object_fn obj_cb,1498 each_loose_cruft_fn cruft_cb,1499 each_loose_subdir_fn subdir_cb,1500void*data);15011502/*1503 * Iterate over loose and packed objects in both the local1504 * repository and any alternates repositories (unless the1505 * LOCAL_ONLY flag is set).1506 */1507#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11508typedefinteach_packed_object_fn(const unsigned char*sha1,1509struct packed_git *pack,1510uint32_t pos,1511void*data);1512externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);1513externintfor_each_packed_object(each_packed_object_fn,void*,unsigned flags);15141515struct object_info {1516/* Request */1517enum object_type *typep;1518unsigned long*sizep;1519unsigned long*disk_sizep;1520unsigned char*delta_base_sha1;1521struct strbuf *typename;15221523/* Response */1524enum{1525 OI_CACHED,1526 OI_LOOSE,1527 OI_PACKED,1528 OI_DBCACHED1529} whence;1530union{1531/*1532 * struct {1533 * ... Nothing to expose in this case1534 * } cached;1535 * struct {1536 * ... Nothing to expose in this case1537 * } loose;1538 */1539struct{1540struct packed_git *pack;1541 off_t offset;1542unsigned int is_delta;1543} packed;1544} u;1545};1546externintsha1_object_info_extended(const unsigned char*,struct object_info *,unsigned flags);15471548/* Dumb servers support */1549externintupdate_server_info(int);15501551/* git_config_parse_key() returns these negated: */1552#define CONFIG_INVALID_KEY 11553#define CONFIG_NO_SECTION_OR_NAME 21554/* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */1555#define CONFIG_NO_LOCK -11556#define CONFIG_INVALID_FILE 31557#define CONFIG_NO_WRITE 41558#define CONFIG_NOTHING_SET 51559#define CONFIG_INVALID_PATTERN 61560#define CONFIG_GENERIC_ERROR 715611562#define CONFIG_REGEX_NONE ((void *)1)15631564struct git_config_source {1565unsigned int use_stdin:1;1566const char*file;1567const char*blob;1568};15691570typedefint(*config_fn_t)(const char*,const char*,void*);1571externintgit_default_config(const char*,const char*,void*);1572externintgit_config_from_file(config_fn_t fn,const char*,void*);1573externintgit_config_from_mem(config_fn_t fn,const char*origin_type,1574const char*name,const char*buf,size_t len,void*data);1575externvoidgit_config_push_parameter(const char*text);1576externintgit_config_from_parameters(config_fn_t fn,void*data);1577externvoidgit_config(config_fn_t fn,void*);1578externintgit_config_with_options(config_fn_t fn,void*,1579struct git_config_source *config_source,1580int respect_includes);1581externintgit_parse_ulong(const char*,unsigned long*);1582externintgit_parse_maybe_bool(const char*);1583externintgit_config_int(const char*,const char*);1584externint64_tgit_config_int64(const char*,const char*);1585externunsigned longgit_config_ulong(const char*,const char*);1586externintgit_config_bool_or_int(const char*,const char*,int*);1587externintgit_config_bool(const char*,const char*);1588externintgit_config_maybe_bool(const char*,const char*);1589externintgit_config_string(const char**,const char*,const char*);1590externintgit_config_pathname(const char**,const char*,const char*);1591externintgit_config_set_in_file_gently(const char*,const char*,const char*);1592externvoidgit_config_set_in_file(const char*,const char*,const char*);1593externintgit_config_set_gently(const char*,const char*);1594externvoidgit_config_set(const char*,const char*);1595externintgit_config_parse_key(const char*,char**,int*);1596externintgit_config_key_is_valid(const char*key);1597externintgit_config_set_multivar_gently(const char*,const char*,const char*,int);1598externvoidgit_config_set_multivar(const char*,const char*,const char*,int);1599externintgit_config_set_multivar_in_file_gently(const char*,const char*,const char*,const char*,int);1600externvoidgit_config_set_multivar_in_file(const char*,const char*,const char*,const char*,int);1601externintgit_config_rename_section(const char*,const char*);1602externintgit_config_rename_section_in_file(const char*,const char*,const char*);1603externconst char*git_etc_gitconfig(void);1604externintgit_env_bool(const char*,int);1605externunsigned longgit_env_ulong(const char*,unsigned long);1606externintgit_config_system(void);1607externintconfig_error_nonbool(const char*);1608#if defined(__GNUC__)1609#define config_error_nonbool(s) (config_error_nonbool(s), const_error())1610#endif1611externconst char*get_log_output_encoding(void);1612externconst char*get_commit_output_encoding(void);16131614externintgit_config_parse_parameter(const char*, config_fn_t fn,void*data);1615externconst char*current_config_origin_type(void);1616externconst char*current_config_name(void);16171618struct config_include_data {1619int depth;1620 config_fn_t fn;1621void*data;1622};1623#define CONFIG_INCLUDE_INIT { 0 }1624externintgit_config_include(const char*name,const char*value,void*data);16251626/*1627 * Match and parse a config key of the form:1628 *1629 * section.(subsection.)?key1630 *1631 * (i.e., what gets handed to a config_fn_t). The caller provides the section;1632 * we return -1 if it does not match, 0 otherwise. The subsection and key1633 * out-parameters are filled by the function (and subsection is NULL if it is1634 * missing).1635 */1636externintparse_config_key(const char*var,1637const char*section,1638const char**subsection,int*subsection_len,1639const char**key);16401641struct config_set_element {1642struct hashmap_entry ent;1643char*key;1644struct string_list value_list;1645};16461647struct configset_list_item {1648struct config_set_element *e;1649int value_index;1650};16511652/*1653 * the contents of the list are ordered according to their1654 * position in the config files and order of parsing the files.1655 * (i.e. key-value pair at the last position of .git/config will1656 * be at the last item of the list)1657 */1658struct configset_list {1659struct configset_list_item *items;1660unsigned int nr, alloc;1661};16621663struct config_set {1664struct hashmap config_hash;1665int hash_initialized;1666struct configset_list list;1667};16681669externvoidgit_configset_init(struct config_set *cs);1670externintgit_configset_add_file(struct config_set *cs,const char*filename);1671externintgit_configset_get_value(struct config_set *cs,const char*key,const char**value);1672externconst struct string_list *git_configset_get_value_multi(struct config_set *cs,const char*key);1673externvoidgit_configset_clear(struct config_set *cs);1674externintgit_configset_get_string_const(struct config_set *cs,const char*key,const char**dest);1675externintgit_configset_get_string(struct config_set *cs,const char*key,char**dest);1676externintgit_configset_get_int(struct config_set *cs,const char*key,int*dest);1677externintgit_configset_get_ulong(struct config_set *cs,const char*key,unsigned long*dest);1678externintgit_configset_get_bool(struct config_set *cs,const char*key,int*dest);1679externintgit_configset_get_bool_or_int(struct config_set *cs,const char*key,int*is_bool,int*dest);1680externintgit_configset_get_maybe_bool(struct config_set *cs,const char*key,int*dest);1681externintgit_configset_get_pathname(struct config_set *cs,const char*key,const char**dest);16821683externintgit_config_get_value(const char*key,const char**value);1684externconst struct string_list *git_config_get_value_multi(const char*key);1685externvoidgit_config_clear(void);1686externvoidgit_config_iter(config_fn_t fn,void*data);1687externintgit_config_get_string_const(const char*key,const char**dest);1688externintgit_config_get_string(const char*key,char**dest);1689externintgit_config_get_int(const char*key,int*dest);1690externintgit_config_get_ulong(const char*key,unsigned long*dest);1691externintgit_config_get_bool(const char*key,int*dest);1692externintgit_config_get_bool_or_int(const char*key,int*is_bool,int*dest);1693externintgit_config_get_maybe_bool(const char*key,int*dest);1694externintgit_config_get_pathname(const char*key,const char**dest);1695externintgit_config_get_untracked_cache(void);16961697/*1698 * This is a hack for test programs like test-dump-untracked-cache to1699 * ensure that they do not modify the untracked cache when reading it.1700 * Do not use it otherwise!1701 */1702externint ignore_untracked_cache_config;17031704struct key_value_info {1705const char*filename;1706int linenr;1707};17081709extern NORETURN voidgit_die_config(const char*key,const char*err, ...)__attribute__((format(printf,2,3)));1710extern NORETURN voidgit_die_config_linenr(const char*key,const char*filename,int linenr);17111712externintcommitter_ident_sufficiently_given(void);1713externintauthor_ident_sufficiently_given(void);17141715externconst char*git_commit_encoding;1716externconst char*git_log_output_encoding;1717externconst char*git_mailmap_file;1718externconst char*git_mailmap_blob;17191720/* IO helper functions */1721externvoidmaybe_flush_or_die(FILE*,const char*);1722__attribute__((format(printf,2,3)))1723externvoidfprintf_or_die(FILE*,const char*fmt, ...);17241725#define COPY_READ_ERROR (-2)1726#define COPY_WRITE_ERROR (-3)1727externintcopy_fd(int ifd,int ofd);1728externintcopy_file(const char*dst,const char*src,int mode);1729externintcopy_file_with_time(const char*dst,const char*src,int mode);17301731externvoidwrite_or_die(int fd,const void*buf,size_t count);1732externintwrite_or_whine(int fd,const void*buf,size_t count,const char*msg);1733externintwrite_or_whine_pipe(int fd,const void*buf,size_t count,const char*msg);1734externvoidfsync_or_die(int fd,const char*);17351736extern ssize_t read_in_full(int fd,void*buf,size_t count);1737extern ssize_t write_in_full(int fd,const void*buf,size_t count);1738extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17391740staticinline ssize_t write_str_in_full(int fd,const char*str)1741{1742returnwrite_in_full(fd, str,strlen(str));1743}17441745externintwrite_file(const char*path,const char*fmt, ...);1746externintwrite_file_gently(const char*path,const char*fmt, ...);17471748/* pager.c */1749externvoidsetup_pager(void);1750externintpager_in_use(void);1751externint pager_use_color;1752externintterm_columns(void);1753externintdecimal_width(uintmax_t);1754externintcheck_pager_config(const char*cmd);1755externvoidprepare_pager_args(struct child_process *,const char*pager);17561757externconst char*editor_program;1758externconst char*askpass_program;1759externconst char*excludes_file;17601761/* base85 */1762intdecode_85(char*dst,const char*line,int linelen);1763voidencode_85(char*buf,const unsigned char*data,int bytes);17641765/* alloc.c */1766externvoid*alloc_blob_node(void);1767externvoid*alloc_tree_node(void);1768externvoid*alloc_commit_node(void);1769externvoid*alloc_tag_node(void);1770externvoid*alloc_object_node(void);1771externvoidalloc_report(void);1772externunsigned intalloc_commit_index(void);17731774/* pkt-line.c */1775voidpacket_trace_identity(const char*prog);17761777/* add */1778/*1779 * return 0 if success, 1 - if addition of a file failed and1780 * ADD_FILES_IGNORE_ERRORS was specified in flags1781 */1782intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);17831784/* diff.c */1785externint diff_auto_refresh_index;17861787/* match-trees.c */1788voidshift_tree(const unsigned char*,const unsigned char*,unsigned char*,int);1789voidshift_tree_by(const unsigned char*,const unsigned char*,unsigned char*,const char*);17901791/*1792 * whitespace rules.1793 * used by both diff and apply1794 * last two digits are tab width1795 */1796#define WS_BLANK_AT_EOL 01001797#define WS_SPACE_BEFORE_TAB 02001798#define WS_INDENT_WITH_NON_TAB 04001799#define WS_CR_AT_EOL 010001800#define WS_BLANK_AT_EOF 020001801#define WS_TAB_IN_INDENT 040001802#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1803#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1804#define WS_TAB_WIDTH_MASK 0771805externunsigned whitespace_rule_cfg;1806externunsignedwhitespace_rule(const char*);1807externunsignedparse_whitespace_rule(const char*);1808externunsignedws_check(const char*line,int len,unsigned ws_rule);1809externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1810externchar*whitespace_error_string(unsigned ws);1811externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1812externintws_blank_line(const char*line,int len,unsigned ws_rule);1813#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18141815/* ls-files */1816voidoverlay_tree_on_cache(const char*tree_name,const char*prefix);18171818char*alias_lookup(const char*alias);1819intsplit_cmdline(char*cmdline,const char***argv);1820/* Takes a negative value returned by split_cmdline */1821const char*split_cmdline_strerror(int cmdline_errno);18221823/* setup.c */1824struct startup_info {1825int have_repository;1826const char*prefix;1827};1828externstruct startup_info *startup_info;18291830/* merge.c */1831struct commit_list;1832inttry_merge_command(const char*strategy,size_t xopts_nr,1833const char**xopts,struct commit_list *common,1834const char*head_arg,struct commit_list *remotes);1835intcheckout_fast_forward(const unsigned char*from,1836const unsigned char*to,1837int overwrite_ignore);183818391840intsane_execvp(const char*file,char*const argv[]);18411842/*1843 * A struct to encapsulate the concept of whether a file has changed1844 * since we last checked it. This uses criteria similar to those used1845 * for the index.1846 */1847struct stat_validity {1848struct stat_data *sd;1849};18501851voidstat_validity_clear(struct stat_validity *sv);18521853/*1854 * Returns 1 if the path is a regular file (or a symlink to a regular1855 * file) and matches the saved stat_validity, 0 otherwise. A missing1856 * or inaccessible file is considered a match if the struct was just1857 * initialized, or if the previous update found an inaccessible file.1858 */1859intstat_validity_check(struct stat_validity *sv,const char*path);18601861/*1862 * Update the stat_validity from a file opened at descriptor fd. If1863 * the file is missing, inaccessible, or not a regular file, then1864 * future calls to stat_validity_check will match iff one of those1865 * conditions continues to be true.1866 */1867voidstat_validity_update(struct stat_validity *sv,int fd);18681869intversioncmp(const char*s1,const char*s2);1870voidsleep_millisec(int millisec);18711872/*1873 * Create a directory and (if share is nonzero) adjust its permissions1874 * according to the shared_repository setting. Only use this for1875 * directories under $GIT_DIR. Don't use it for working tree1876 * directories.1877 */1878voidsafe_create_dir(const char*dir,int share);18791880#endif/* CACHE_H */