1#ifndef CACHE_H 2#define CACHE_H 3 4#include"git-compat-util.h" 5#include"strbuf.h" 6#include"hashmap.h" 7#include"mru.h" 8#include"advice.h" 9#include"gettext.h" 10#include"convert.h" 11#include"trace.h" 12#include"string-list.h" 13#include"pack-revindex.h" 14#include"hash.h" 15#include"path.h" 16#include"sha1-array.h" 17#include"repository.h" 18 19#ifndef platform_SHA_CTX 20/* 21 * platform's underlying implementation of SHA-1; could be OpenSSL, 22 * blk_SHA, Apple CommonCrypto, etc... Note that including 23 * SHA1_HEADER may have already defined platform_SHA_CTX for our 24 * own implementations like block-sha1 and ppc-sha1, so we list 25 * the default for OpenSSL compatible SHA-1 implementations here. 26 */ 27#define platform_SHA_CTX SHA_CTX 28#define platform_SHA1_Init SHA1_Init 29#define platform_SHA1_Update SHA1_Update 30#define platform_SHA1_Final SHA1_Final 31#endif 32 33#define git_SHA_CTX platform_SHA_CTX 34#define git_SHA1_Init platform_SHA1_Init 35#define git_SHA1_Update platform_SHA1_Update 36#define git_SHA1_Final platform_SHA1_Final 37 38#ifdef SHA1_MAX_BLOCK_SIZE 39#include"compat/sha1-chunked.h" 40#undef git_SHA1_Update 41#define git_SHA1_Update git_SHA1_Update_Chunked 42#endif 43 44#include <zlib.h> 45typedefstruct git_zstream { 46 z_stream z; 47unsigned long avail_in; 48unsigned long avail_out; 49unsigned long total_in; 50unsigned long total_out; 51unsigned char*next_in; 52unsigned char*next_out; 53} git_zstream; 54 55voidgit_inflate_init(git_zstream *); 56voidgit_inflate_init_gzip_only(git_zstream *); 57voidgit_inflate_end(git_zstream *); 58intgit_inflate(git_zstream *,int flush); 59 60voidgit_deflate_init(git_zstream *,int level); 61voidgit_deflate_init_gzip(git_zstream *,int level); 62voidgit_deflate_init_raw(git_zstream *,int level); 63voidgit_deflate_end(git_zstream *); 64intgit_deflate_abort(git_zstream *); 65intgit_deflate_end_gently(git_zstream *); 66intgit_deflate(git_zstream *,int flush); 67unsigned longgit_deflate_bound(git_zstream *,unsigned long); 68 69/* The length in bytes and in hex digits of an object name (SHA-1 value). */ 70#define GIT_SHA1_RAWSZ 20 71#define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ) 72 73/* The length in byte and in hex digits of the largest possible hash value. */ 74#define GIT_MAX_RAWSZ GIT_SHA1_RAWSZ 75#define GIT_MAX_HEXSZ GIT_SHA1_HEXSZ 76 77struct object_id { 78unsigned char hash[GIT_MAX_RAWSZ]; 79}; 80 81#define the_hash_algo the_repository->hash_algo 82 83#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) 84#define DTYPE(de) ((de)->d_type) 85#else 86#undef DT_UNKNOWN 87#undef DT_DIR 88#undef DT_REG 89#undef DT_LNK 90#define DT_UNKNOWN 0 91#define DT_DIR 1 92#define DT_REG 2 93#define DT_LNK 3 94#define DTYPE(de) DT_UNKNOWN 95#endif 96 97/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ 98#define S_IFINVALID 0030000 99 100/* 101 * A "directory link" is a link to another git directory. 102 * 103 * The value 0160000 is not normally a valid mode, and 104 * also just happens to be S_IFDIR + S_IFLNK 105 */ 106#define S_IFGITLINK 0160000 107#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) 108 109/* 110 * Some mode bits are also used internally for computations. 111 * 112 * They *must* not overlap with any valid modes, and they *must* not be emitted 113 * to outside world - i.e. appear on disk or network. In other words, it's just 114 * temporary fields, which we internally use, but they have to stay in-house. 115 * 116 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git 117 * codebase mode is `unsigned int` which is assumed to be at least 32 bits ) 118 */ 119 120/* used internally in tree-diff */ 121#define S_DIFFTREE_IFXMIN_NEQ 0x80000000 122 123 124/* 125 * Intensive research over the course of many years has shown that 126 * port 9418 is totally unused by anything else. Or 127 * 128 * Your search - "port 9418" - did not match any documents. 129 * 130 * as www.google.com puts it. 131 * 132 * This port has been properly assigned for git use by IANA: 133 * git (Assigned-9418) [I06-050728-0001]. 134 * 135 * git 9418/tcp git pack transfer service 136 * git 9418/udp git pack transfer service 137 * 138 * with Linus Torvalds <torvalds@osdl.org> as the point of 139 * contact. September 2005. 140 * 141 * See http://www.iana.org/assignments/port-numbers 142 */ 143#define DEFAULT_GIT_PORT 9418 144 145/* 146 * Basic data structures for the directory cache 147 */ 148 149#define CACHE_SIGNATURE 0x44495243/* "DIRC" */ 150struct cache_header { 151uint32_t hdr_signature; 152uint32_t hdr_version; 153uint32_t hdr_entries; 154}; 155 156#define INDEX_FORMAT_LB 2 157#define INDEX_FORMAT_UB 4 158 159/* 160 * The "cache_time" is just the low 32 bits of the 161 * time. It doesn't matter if it overflows - we only 162 * check it for equality in the 32 bits we save. 163 */ 164struct cache_time { 165uint32_t sec; 166uint32_t nsec; 167}; 168 169struct stat_data { 170struct cache_time sd_ctime; 171struct cache_time sd_mtime; 172unsigned int sd_dev; 173unsigned int sd_ino; 174unsigned int sd_uid; 175unsigned int sd_gid; 176unsigned int sd_size; 177}; 178 179struct cache_entry { 180struct hashmap_entry ent; 181struct stat_data ce_stat_data; 182unsigned int ce_mode; 183unsigned int ce_flags; 184unsigned int ce_namelen; 185unsigned int index;/* for link extension */ 186struct object_id oid; 187char name[FLEX_ARRAY];/* more */ 188}; 189 190#define CE_STAGEMASK (0x3000) 191#define CE_EXTENDED (0x4000) 192#define CE_VALID (0x8000) 193#define CE_STAGESHIFT 12 194 195/* 196 * Range 0xFFFF0FFF in ce_flags is divided into 197 * two parts: in-memory flags and on-disk ones. 198 * Flags in CE_EXTENDED_FLAGS will get saved on-disk 199 * if you want to save a new flag, add it in 200 * CE_EXTENDED_FLAGS 201 * 202 * In-memory only flags 203 */ 204#define CE_UPDATE (1 << 16) 205#define CE_REMOVE (1 << 17) 206#define CE_UPTODATE (1 << 18) 207#define CE_ADDED (1 << 19) 208 209#define CE_HASHED (1 << 20) 210#define CE_WT_REMOVE (1 << 22)/* remove in work directory */ 211#define CE_CONFLICTED (1 << 23) 212 213#define CE_UNPACKED (1 << 24) 214#define CE_NEW_SKIP_WORKTREE (1 << 25) 215 216/* used to temporarily mark paths matched by pathspecs */ 217#define CE_MATCHED (1 << 26) 218 219#define CE_UPDATE_IN_BASE (1 << 27) 220#define CE_STRIP_NAME (1 << 28) 221 222/* 223 * Extended on-disk flags 224 */ 225#define CE_INTENT_TO_ADD (1 << 29) 226#define CE_SKIP_WORKTREE (1 << 30) 227/* CE_EXTENDED2 is for future extension */ 228#define CE_EXTENDED2 (1U << 31) 229 230#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE) 231 232/* 233 * Safeguard to avoid saving wrong flags: 234 * - CE_EXTENDED2 won't get saved until its semantic is known 235 * - Bits in 0x0000FFFF have been saved in ce_flags already 236 * - Bits in 0x003F0000 are currently in-memory flags 237 */ 238#if CE_EXTENDED_FLAGS & 0x803FFFFF 239#error"CE_EXTENDED_FLAGS out of range" 240#endif 241 242/* Forward structure decls */ 243struct pathspec; 244struct child_process; 245 246/* 247 * Copy the sha1 and stat state of a cache entry from one to 248 * another. But we never change the name, or the hash state! 249 */ 250staticinlinevoidcopy_cache_entry(struct cache_entry *dst, 251const struct cache_entry *src) 252{ 253unsigned int state = dst->ce_flags & CE_HASHED; 254 255/* Don't copy hash chain and name */ 256memcpy(&dst->ce_stat_data, &src->ce_stat_data, 257offsetof(struct cache_entry, name) - 258offsetof(struct cache_entry, ce_stat_data)); 259 260/* Restore the hash state */ 261 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state; 262} 263 264staticinlineunsignedcreate_ce_flags(unsigned stage) 265{ 266return(stage << CE_STAGESHIFT); 267} 268 269#define ce_namelen(ce) ((ce)->ce_namelen) 270#define ce_size(ce) cache_entry_size(ce_namelen(ce)) 271#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT) 272#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE) 273#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE) 274#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE) 275#define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD) 276 277#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) 278staticinlineunsigned intcreate_ce_mode(unsigned int mode) 279{ 280if(S_ISLNK(mode)) 281return S_IFLNK; 282if(S_ISDIR(mode) ||S_ISGITLINK(mode)) 283return S_IFGITLINK; 284return S_IFREG |ce_permissions(mode); 285} 286staticinlineunsigned intce_mode_from_stat(const struct cache_entry *ce, 287unsigned int mode) 288{ 289externint trust_executable_bit, has_symlinks; 290if(!has_symlinks &&S_ISREG(mode) && 291 ce &&S_ISLNK(ce->ce_mode)) 292return ce->ce_mode; 293if(!trust_executable_bit &&S_ISREG(mode)) { 294if(ce &&S_ISREG(ce->ce_mode)) 295return ce->ce_mode; 296returncreate_ce_mode(0666); 297} 298returncreate_ce_mode(mode); 299} 300staticinlineintce_to_dtype(const struct cache_entry *ce) 301{ 302unsigned ce_mode =ntohl(ce->ce_mode); 303if(S_ISREG(ce_mode)) 304return DT_REG; 305else if(S_ISDIR(ce_mode) ||S_ISGITLINK(ce_mode)) 306return DT_DIR; 307else if(S_ISLNK(ce_mode)) 308return DT_LNK; 309else 310return DT_UNKNOWN; 311} 312staticinlineunsigned intcanon_mode(unsigned int mode) 313{ 314if(S_ISREG(mode)) 315return S_IFREG |ce_permissions(mode); 316if(S_ISLNK(mode)) 317return S_IFLNK; 318if(S_ISDIR(mode)) 319return S_IFDIR; 320return S_IFGITLINK; 321} 322 323#define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1) 324 325#define SOMETHING_CHANGED (1 << 0)/* unclassified changes go here */ 326#define CE_ENTRY_CHANGED (1 << 1) 327#define CE_ENTRY_REMOVED (1 << 2) 328#define CE_ENTRY_ADDED (1 << 3) 329#define RESOLVE_UNDO_CHANGED (1 << 4) 330#define CACHE_TREE_CHANGED (1 << 5) 331#define SPLIT_INDEX_ORDERED (1 << 6) 332#define UNTRACKED_CHANGED (1 << 7) 333 334struct split_index; 335struct untracked_cache; 336 337struct index_state { 338struct cache_entry **cache; 339unsigned int version; 340unsigned int cache_nr, cache_alloc, cache_changed; 341struct string_list *resolve_undo; 342struct cache_tree *cache_tree; 343struct split_index *split_index; 344struct cache_time timestamp; 345unsigned name_hash_initialized :1, 346 initialized :1; 347struct hashmap name_hash; 348struct hashmap dir_hash; 349unsigned char sha1[20]; 350struct untracked_cache *untracked; 351}; 352 353externstruct index_state the_index; 354 355/* Name hashing */ 356externinttest_lazy_init_name_hash(struct index_state *istate,int try_threaded); 357externvoidadd_name_hash(struct index_state *istate,struct cache_entry *ce); 358externvoidremove_name_hash(struct index_state *istate,struct cache_entry *ce); 359externvoidfree_name_hash(struct index_state *istate); 360 361 362#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS 363#define active_cache (the_index.cache) 364#define active_nr (the_index.cache_nr) 365#define active_alloc (the_index.cache_alloc) 366#define active_cache_changed (the_index.cache_changed) 367#define active_cache_tree (the_index.cache_tree) 368 369#define read_cache() read_index(&the_index) 370#define read_cache_from(path) read_index_from(&the_index, (path)) 371#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec)) 372#define is_cache_unborn() is_index_unborn(&the_index) 373#define read_cache_unmerged() read_index_unmerged(&the_index) 374#define discard_cache() discard_index(&the_index) 375#define unmerged_cache() unmerged_index(&the_index) 376#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) 377#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) 378#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name)) 379#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) 380#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) 381#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags)) 382#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags)) 383#define chmod_cache_entry(ce, flip) chmod_index_entry(&the_index, (ce), (flip)) 384#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL) 385#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options)) 386#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options)) 387#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen)) 388#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase)) 389#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen)) 390#define resolve_undo_clear() resolve_undo_clear_index(&the_index) 391#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at) 392#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec) 393#define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz)) 394#endif 395 396enum object_type { 397 OBJ_BAD = -1, 398 OBJ_NONE =0, 399 OBJ_COMMIT =1, 400 OBJ_TREE =2, 401 OBJ_BLOB =3, 402 OBJ_TAG =4, 403/* 5 for future expansion */ 404 OBJ_OFS_DELTA =6, 405 OBJ_REF_DELTA =7, 406 OBJ_ANY, 407 OBJ_MAX 408}; 409 410staticinlineenum object_type object_type(unsigned int mode) 411{ 412returnS_ISDIR(mode) ? OBJ_TREE : 413S_ISGITLINK(mode) ? OBJ_COMMIT : 414 OBJ_BLOB; 415} 416 417/* Double-check local_repo_env below if you add to this list. */ 418#define GIT_DIR_ENVIRONMENT"GIT_DIR" 419#define GIT_COMMON_DIR_ENVIRONMENT"GIT_COMMON_DIR" 420#define GIT_NAMESPACE_ENVIRONMENT"GIT_NAMESPACE" 421#define GIT_WORK_TREE_ENVIRONMENT"GIT_WORK_TREE" 422#define GIT_PREFIX_ENVIRONMENT"GIT_PREFIX" 423#define GIT_SUPER_PREFIX_ENVIRONMENT"GIT_INTERNAL_SUPER_PREFIX" 424#define DEFAULT_GIT_DIR_ENVIRONMENT".git" 425#define DB_ENVIRONMENT"GIT_OBJECT_DIRECTORY" 426#define INDEX_ENVIRONMENT"GIT_INDEX_FILE" 427#define GRAFT_ENVIRONMENT"GIT_GRAFT_FILE" 428#define GIT_SHALLOW_FILE_ENVIRONMENT"GIT_SHALLOW_FILE" 429#define TEMPLATE_DIR_ENVIRONMENT"GIT_TEMPLATE_DIR" 430#define CONFIG_ENVIRONMENT"GIT_CONFIG" 431#define CONFIG_DATA_ENVIRONMENT"GIT_CONFIG_PARAMETERS" 432#define EXEC_PATH_ENVIRONMENT"GIT_EXEC_PATH" 433#define CEILING_DIRECTORIES_ENVIRONMENT"GIT_CEILING_DIRECTORIES" 434#define NO_REPLACE_OBJECTS_ENVIRONMENT"GIT_NO_REPLACE_OBJECTS" 435#define GIT_REPLACE_REF_BASE_ENVIRONMENT"GIT_REPLACE_REF_BASE" 436#define GITATTRIBUTES_FILE".gitattributes" 437#define INFOATTRIBUTES_FILE"info/attributes" 438#define ATTRIBUTE_MACRO_PREFIX"[attr]" 439#define GITMODULES_FILE".gitmodules" 440#define GIT_NOTES_REF_ENVIRONMENT"GIT_NOTES_REF" 441#define GIT_NOTES_DEFAULT_REF"refs/notes/commits" 442#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT"GIT_NOTES_DISPLAY_REF" 443#define GIT_NOTES_REWRITE_REF_ENVIRONMENT"GIT_NOTES_REWRITE_REF" 444#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT"GIT_NOTES_REWRITE_MODE" 445#define GIT_LITERAL_PATHSPECS_ENVIRONMENT"GIT_LITERAL_PATHSPECS" 446#define GIT_GLOB_PATHSPECS_ENVIRONMENT"GIT_GLOB_PATHSPECS" 447#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT"GIT_NOGLOB_PATHSPECS" 448#define GIT_ICASE_PATHSPECS_ENVIRONMENT"GIT_ICASE_PATHSPECS" 449#define GIT_QUARANTINE_ENVIRONMENT"GIT_QUARANTINE_PATH" 450#define GIT_OPTIONAL_LOCKS_ENVIRONMENT"GIT_OPTIONAL_LOCKS" 451 452/* 453 * This environment variable is expected to contain a boolean indicating 454 * whether we should or should not treat: 455 * 456 * GIT_DIR=foo.git git ... 457 * 458 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use 459 * of this, but we use it internally to communicate to sub-processes that we 460 * are in a bare repo. If not set, defaults to true. 461 */ 462#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT"GIT_IMPLICIT_WORK_TREE" 463 464/* 465 * Repository-local GIT_* environment variables; these will be cleared 466 * when git spawns a sub-process that runs inside another repository. 467 * The array is NULL-terminated, which makes it easy to pass in the "env" 468 * parameter of a run-command invocation, or to do a simple walk. 469 */ 470externconst char*const local_repo_env[]; 471 472externvoidsetup_git_env(void); 473 474/* 475 * Returns true iff we have a configured git repository (either via 476 * setup_git_directory, or in the environment via $GIT_DIR). 477 */ 478inthave_git_dir(void); 479 480externint is_bare_repository_cfg; 481externintis_bare_repository(void); 482externintis_inside_git_dir(void); 483externchar*git_work_tree_cfg; 484externintis_inside_work_tree(void); 485externconst char*get_git_dir(void); 486externconst char*get_git_common_dir(void); 487externchar*get_object_directory(void); 488externchar*get_index_file(void); 489externchar*get_graft_file(void); 490externintset_git_dir(const char*path); 491externintget_common_dir_noenv(struct strbuf *sb,const char*gitdir); 492externintget_common_dir(struct strbuf *sb,const char*gitdir); 493externconst char*get_git_namespace(void); 494externconst char*strip_namespace(const char*namespaced_ref); 495externconst char*get_super_prefix(void); 496externconst char*get_git_work_tree(void); 497 498/* 499 * Return true if the given path is a git directory; note that this _just_ 500 * looks at the directory itself. If you want to know whether "foo/.git" 501 * is a repository, you must feed that path, not just "foo". 502 */ 503externintis_git_directory(const char*path); 504 505/* 506 * Return 1 if the given path is the root of a git repository or 507 * submodule, else 0. Will not return 1 for bare repositories with the 508 * exception of creating a bare repository in "foo/.git" and calling 509 * is_git_repository("foo"). 510 * 511 * If we run into read errors, we err on the side of saying "yes, it is", 512 * as we usually consider sub-repos precious, and would prefer to err on the 513 * side of not disrupting or deleting them. 514 */ 515externintis_nonbare_repository_dir(struct strbuf *path); 516 517#define READ_GITFILE_ERR_STAT_FAILED 1 518#define READ_GITFILE_ERR_NOT_A_FILE 2 519#define READ_GITFILE_ERR_OPEN_FAILED 3 520#define READ_GITFILE_ERR_READ_FAILED 4 521#define READ_GITFILE_ERR_INVALID_FORMAT 5 522#define READ_GITFILE_ERR_NO_PATH 6 523#define READ_GITFILE_ERR_NOT_A_REPO 7 524#define READ_GITFILE_ERR_TOO_LARGE 8 525externvoidread_gitfile_error_die(int error_code,const char*path,const char*dir); 526externconst char*read_gitfile_gently(const char*path,int*return_error_code); 527#define read_gitfile(path) read_gitfile_gently((path), NULL) 528externconst char*resolve_gitdir_gently(const char*suspect,int*return_error_code); 529#define resolve_gitdir(path) resolve_gitdir_gently((path), NULL) 530 531externvoidset_git_work_tree(const char*tree); 532 533#define ALTERNATE_DB_ENVIRONMENT"GIT_ALTERNATE_OBJECT_DIRECTORIES" 534 535externvoidsetup_work_tree(void); 536/* 537 * Find the commondir and gitdir of the repository that contains the current 538 * working directory, without changing the working directory or other global 539 * state. The result is appended to commondir and gitdir. If the discovered 540 * gitdir does not correspond to a worktree, then 'commondir' and 'gitdir' will 541 * both have the same result appended to the buffer. The return value is 542 * either 0 upon success and non-zero if no repository was found. 543 */ 544externintdiscover_git_directory(struct strbuf *commondir, 545struct strbuf *gitdir); 546externconst char*setup_git_directory_gently(int*); 547externconst char*setup_git_directory(void); 548externchar*prefix_path(const char*prefix,int len,const char*path); 549externchar*prefix_path_gently(const char*prefix,int len,int*remaining,const char*path); 550 551/* 552 * Concatenate "prefix" (if len is non-zero) and "path", with no 553 * connecting characters (so "prefix" should end with a "/"). 554 * Unlike prefix_path, this should be used if the named file does 555 * not have to interact with index entry; i.e. name of a random file 556 * on the filesystem. 557 * 558 * The return value is always a newly allocated string (even if the 559 * prefix was empty). 560 */ 561externchar*prefix_filename(const char*prefix,const char*path); 562 563externintcheck_filename(const char*prefix,const char*name); 564externvoidverify_filename(const char*prefix, 565const char*name, 566int diagnose_misspelt_rev); 567externvoidverify_non_filename(const char*prefix,const char*name); 568externintpath_inside_repo(const char*prefix,const char*path); 569 570#define INIT_DB_QUIET 0x0001 571#define INIT_DB_EXIST_OK 0x0002 572 573externintinit_db(const char*git_dir,const char*real_git_dir, 574const char*template_dir,unsigned int flags); 575 576externvoidsanitize_stdfds(void); 577externintdaemonize(void); 578 579#define alloc_nr(x) (((x)+16)*3/2) 580 581/* 582 * Realloc the buffer pointed at by variable 'x' so that it can hold 583 * at least 'nr' entries; the number of entries currently allocated 584 * is 'alloc', using the standard growing factor alloc_nr() macro. 585 * 586 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'. 587 */ 588#define ALLOC_GROW(x, nr, alloc) \ 589 do { \ 590 if ((nr) > alloc) { \ 591 if (alloc_nr(alloc) < (nr)) \ 592 alloc = (nr); \ 593 else \ 594 alloc = alloc_nr(alloc); \ 595 REALLOC_ARRAY(x, alloc); \ 596 } \ 597 } while (0) 598 599/* Initialize and use the cache information */ 600struct lock_file; 601externintread_index(struct index_state *); 602externintread_index_preload(struct index_state *,const struct pathspec *pathspec); 603externintdo_read_index(struct index_state *istate,const char*path, 604int must_exist);/* for testting only! */ 605externintread_index_from(struct index_state *,const char*path); 606externintis_index_unborn(struct index_state *); 607externintread_index_unmerged(struct index_state *); 608 609/* For use with `write_locked_index()`. */ 610#define COMMIT_LOCK (1 << 0) 611 612/* 613 * Write the index while holding an already-taken lock. Close the lock, 614 * and if `COMMIT_LOCK` is given, commit it. 615 * 616 * Unless a split index is in use, write the index into the lockfile. 617 * 618 * With a split index, write the shared index to a temporary file, 619 * adjust its permissions and rename it into place, then write the 620 * split index to the lockfile. If the temporary file for the shared 621 * index cannot be created, fall back to the behavior described in 622 * the previous paragraph. 623 * 624 * With `COMMIT_LOCK`, the lock is always committed or rolled back. 625 * Without it, the lock is closed, but neither committed nor rolled 626 * back. 627 */ 628externintwrite_locked_index(struct index_state *,struct lock_file *lock,unsigned flags); 629 630externintdiscard_index(struct index_state *); 631externvoidmove_index_extensions(struct index_state *dst,struct index_state *src); 632externintunmerged_index(const struct index_state *); 633externintverify_path(const char*path); 634externintstrcmp_offset(const char*s1,const char*s2,size_t*first_change); 635externintindex_dir_exists(struct index_state *istate,const char*name,int namelen); 636externvoidadjust_dirname_case(struct index_state *istate,char*name); 637externstruct cache_entry *index_file_exists(struct index_state *istate,const char*name,int namelen,int igncase); 638 639/* 640 * Searches for an entry defined by name and namelen in the given index. 641 * If the return value is positive (including 0) it is the position of an 642 * exact match. If the return value is negative, the negated value minus 1 643 * is the position where the entry would be inserted. 644 * Example: The current index consists of these files and its stages: 645 * 646 * b#0, d#0, f#1, f#3 647 * 648 * index_name_pos(&index, "a", 1) -> -1 649 * index_name_pos(&index, "b", 1) -> 0 650 * index_name_pos(&index, "c", 1) -> -2 651 * index_name_pos(&index, "d", 1) -> 1 652 * index_name_pos(&index, "e", 1) -> -3 653 * index_name_pos(&index, "f", 1) -> -3 654 * index_name_pos(&index, "g", 1) -> -5 655 */ 656externintindex_name_pos(const struct index_state *,const char*name,int namelen); 657 658#define ADD_CACHE_OK_TO_ADD 1/* Ok to add */ 659#define ADD_CACHE_OK_TO_REPLACE 2/* Ok to replace file/directory */ 660#define ADD_CACHE_SKIP_DFCHECK 4/* Ok to skip DF conflict checks */ 661#define ADD_CACHE_JUST_APPEND 8/* Append only; tree.c::read_tree() */ 662#define ADD_CACHE_NEW_ONLY 16/* Do not replace existing ones */ 663#define ADD_CACHE_KEEP_CACHE_TREE 32/* Do not invalidate cache-tree */ 664externintadd_index_entry(struct index_state *,struct cache_entry *ce,int option); 665externvoidrename_index_entry_at(struct index_state *,int pos,const char*new_name); 666 667/* Remove entry, return true if there are more entries to go. */ 668externintremove_index_entry_at(struct index_state *,int pos); 669 670externvoidremove_marked_cache_entries(struct index_state *istate); 671externintremove_file_from_index(struct index_state *,const char*path); 672#define ADD_CACHE_VERBOSE 1 673#define ADD_CACHE_PRETEND 2 674#define ADD_CACHE_IGNORE_ERRORS 4 675#define ADD_CACHE_IGNORE_REMOVAL 8 676#define ADD_CACHE_INTENT 16 677/* 678 * These two are used to add the contents of the file at path 679 * to the index, marking the working tree up-to-date by storing 680 * the cached stat info in the resulting cache entry. A caller 681 * that has already run lstat(2) on the path can call 682 * add_to_index(), and all others can call add_file_to_index(); 683 * the latter will do necessary lstat(2) internally before 684 * calling the former. 685 */ 686externintadd_to_index(struct index_state *,const char*path,struct stat *,int flags); 687externintadd_file_to_index(struct index_state *,const char*path,int flags); 688 689externstruct cache_entry *make_cache_entry(unsigned int mode,const unsigned char*sha1,const char*path,int stage,unsigned int refresh_options); 690externintchmod_index_entry(struct index_state *,struct cache_entry *ce,char flip); 691externintce_same_name(const struct cache_entry *a,const struct cache_entry *b); 692externvoidset_object_name_for_intent_to_add_entry(struct cache_entry *ce); 693externintindex_name_is_other(const struct index_state *,const char*,int); 694externvoid*read_blob_data_from_index(const struct index_state *,const char*,unsigned long*); 695 696/* do stat comparison even if CE_VALID is true */ 697#define CE_MATCH_IGNORE_VALID 01 698/* do not check the contents but report dirty on racily-clean entries */ 699#define CE_MATCH_RACY_IS_DIRTY 02 700/* do stat comparison even if CE_SKIP_WORKTREE is true */ 701#define CE_MATCH_IGNORE_SKIP_WORKTREE 04 702/* ignore non-existent files during stat update */ 703#define CE_MATCH_IGNORE_MISSING 0x08 704/* enable stat refresh */ 705#define CE_MATCH_REFRESH 0x10 706externintie_match_stat(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 707externintie_modified(const struct index_state *,const struct cache_entry *,struct stat *,unsigned int); 708 709#define HASH_WRITE_OBJECT 1 710#define HASH_FORMAT_CHECK 2 711externintindex_fd(struct object_id *oid,int fd,struct stat *st,enum object_type type,const char*path,unsigned flags); 712externintindex_path(struct object_id *oid,const char*path,struct stat *st,unsigned flags); 713 714/* 715 * Record to sd the data from st that we use to check whether a file 716 * might have changed. 717 */ 718externvoidfill_stat_data(struct stat_data *sd,struct stat *st); 719 720/* 721 * Return 0 if st is consistent with a file not having been changed 722 * since sd was filled. If there are differences, return a 723 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED, 724 * INODE_CHANGED, and DATA_CHANGED. 725 */ 726externintmatch_stat_data(const struct stat_data *sd,struct stat *st); 727externintmatch_stat_data_racy(const struct index_state *istate, 728const struct stat_data *sd,struct stat *st); 729 730externvoidfill_stat_cache_info(struct cache_entry *ce,struct stat *st); 731 732#define REFRESH_REALLY 0x0001/* ignore_valid */ 733#define REFRESH_UNMERGED 0x0002/* allow unmerged */ 734#define REFRESH_QUIET 0x0004/* be quiet about it */ 735#define REFRESH_IGNORE_MISSING 0x0008/* ignore non-existent */ 736#define REFRESH_IGNORE_SUBMODULES 0x0010/* ignore submodules */ 737#define REFRESH_IN_PORCELAIN 0x0020/* user friendly output, not "needs update" */ 738externintrefresh_index(struct index_state *,unsigned int flags,const struct pathspec *pathspec,char*seen,const char*header_msg); 739externstruct cache_entry *refresh_cache_entry(struct cache_entry *,unsigned int); 740 741/* 742 * Opportunistically update the index but do not complain if we can't. 743 * The lockfile is always committed or rolled back. 744 */ 745externvoidupdate_index_if_able(struct index_state *,struct lock_file *); 746 747externinthold_locked_index(struct lock_file *,int); 748externvoidset_alternate_index_output(const char*); 749 750externint verify_index_checksum; 751 752/* Environment bits from configuration mechanism */ 753externint trust_executable_bit; 754externint trust_ctime; 755externint check_stat; 756externint quote_path_fully; 757externint has_symlinks; 758externint minimum_abbrev, default_abbrev; 759externint ignore_case; 760externint assume_unchanged; 761externint prefer_symlink_refs; 762externint warn_ambiguous_refs; 763externint warn_on_object_refname_ambiguity; 764externconst char*apply_default_whitespace; 765externconst char*apply_default_ignorewhitespace; 766externconst char*git_attributes_file; 767externconst char*git_hooks_path; 768externint zlib_compression_level; 769externint core_compression_level; 770externint pack_compression_level; 771externsize_t packed_git_window_size; 772externsize_t packed_git_limit; 773externsize_t delta_base_cache_limit; 774externunsigned long big_file_threshold; 775externunsigned long pack_size_limit_cfg; 776 777/* 778 * Accessors for the core.sharedrepository config which lazy-load the value 779 * from the config (if not already set). The "reset" function can be 780 * used to unset "set" or cached value, meaning that the value will be loaded 781 * fresh from the config file on the next call to get_shared_repository(). 782 */ 783voidset_shared_repository(int value); 784intget_shared_repository(void); 785voidreset_shared_repository(void); 786 787/* 788 * Do replace refs need to be checked this run? This variable is 789 * initialized to true unless --no-replace-object is used or 790 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some 791 * commands that do not want replace references to be active. As an 792 * optimization it is also set to false if replace references have 793 * been sought but there were none. 794 */ 795externint check_replace_refs; 796externchar*git_replace_ref_base; 797 798externint fsync_object_files; 799externint core_preload_index; 800externint core_apply_sparse_checkout; 801externint precomposed_unicode; 802externint protect_hfs; 803externint protect_ntfs; 804 805/* 806 * Include broken refs in all ref iterations, which will 807 * generally choke dangerous operations rather than letting 808 * them silently proceed without taking the broken ref into 809 * account. 810 */ 811externint ref_paranoia; 812 813/* 814 * Returns the boolean value of $GIT_OPTIONAL_LOCKS (or the default value). 815 */ 816intuse_optional_locks(void); 817 818/* 819 * The character that begins a commented line in user-editable file 820 * that is subject to stripspace. 821 */ 822externchar comment_line_char; 823externint auto_comment_line_char; 824 825/* Windows only */ 826enum hide_dotfiles_type { 827 HIDE_DOTFILES_FALSE =0, 828 HIDE_DOTFILES_TRUE, 829 HIDE_DOTFILES_DOTGITONLY 830}; 831externenum hide_dotfiles_type hide_dotfiles; 832 833enum log_refs_config { 834 LOG_REFS_UNSET = -1, 835 LOG_REFS_NONE =0, 836 LOG_REFS_NORMAL, 837 LOG_REFS_ALWAYS 838}; 839externenum log_refs_config log_all_ref_updates; 840 841enum branch_track { 842 BRANCH_TRACK_UNSPECIFIED = -1, 843 BRANCH_TRACK_NEVER =0, 844 BRANCH_TRACK_REMOTE, 845 BRANCH_TRACK_ALWAYS, 846 BRANCH_TRACK_EXPLICIT, 847 BRANCH_TRACK_OVERRIDE 848}; 849 850enum rebase_setup_type { 851 AUTOREBASE_NEVER =0, 852 AUTOREBASE_LOCAL, 853 AUTOREBASE_REMOTE, 854 AUTOREBASE_ALWAYS 855}; 856 857enum push_default_type { 858 PUSH_DEFAULT_NOTHING =0, 859 PUSH_DEFAULT_MATCHING, 860 PUSH_DEFAULT_SIMPLE, 861 PUSH_DEFAULT_UPSTREAM, 862 PUSH_DEFAULT_CURRENT, 863 PUSH_DEFAULT_UNSPECIFIED 864}; 865 866externenum branch_track git_branch_track; 867externenum rebase_setup_type autorebase; 868externenum push_default_type push_default; 869 870enum object_creation_mode { 871 OBJECT_CREATION_USES_HARDLINKS =0, 872 OBJECT_CREATION_USES_RENAMES =1 873}; 874 875externenum object_creation_mode object_creation_mode; 876 877externchar*notes_ref_name; 878 879externint grafts_replace_parents; 880 881/* 882 * GIT_REPO_VERSION is the version we write by default. The 883 * _READ variant is the highest number we know how to 884 * handle. 885 */ 886#define GIT_REPO_VERSION 0 887#define GIT_REPO_VERSION_READ 1 888externint repository_format_precious_objects; 889 890struct repository_format { 891int version; 892int precious_objects; 893int is_bare; 894int hash_algo; 895char*work_tree; 896struct string_list unknown_extensions; 897}; 898 899/* 900 * Read the repository format characteristics from the config file "path" into 901 * "format" struct. Returns the numeric version. On error, -1 is returned, 902 * format->version is set to -1, and all other fields in the struct are 903 * undefined. 904 */ 905intread_repository_format(struct repository_format *format,const char*path); 906 907/* 908 * Verify that the repository described by repository_format is something we 909 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe 910 * any errors encountered. 911 */ 912intverify_repository_format(const struct repository_format *format, 913struct strbuf *err); 914 915/* 916 * Check the repository format version in the path found in get_git_dir(), 917 * and die if it is a version we don't understand. Generally one would 918 * set_git_dir() before calling this, and use it only for "are we in a valid 919 * repo?". 920 */ 921externvoidcheck_repository_format(void); 922 923#define MTIME_CHANGED 0x0001 924#define CTIME_CHANGED 0x0002 925#define OWNER_CHANGED 0x0004 926#define MODE_CHANGED 0x0008 927#define INODE_CHANGED 0x0010 928#define DATA_CHANGED 0x0020 929#define TYPE_CHANGED 0x0040 930 931/* 932 * Return the name of the file in the local object database that would 933 * be used to store a loose object with the specified sha1. The 934 * return value is a pointer to a statically allocated buffer that is 935 * overwritten each time the function is called. 936 */ 937externconst char*sha1_file_name(const unsigned char*sha1); 938 939/* 940 * Return an abbreviated sha1 unique within this repository's object database. 941 * The result will be at least `len` characters long, and will be NUL 942 * terminated. 943 * 944 * The non-`_r` version returns a static buffer which remains valid until 4 945 * more calls to find_unique_abbrev are made. 946 * 947 * The `_r` variant writes to a buffer supplied by the caller, which must be at 948 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes 949 * written (excluding the NUL terminator). 950 * 951 * Note that while this version avoids the static buffer, it is not fully 952 * reentrant, as it calls into other non-reentrant git code. 953 */ 954externconst char*find_unique_abbrev(const unsigned char*sha1,int len); 955externintfind_unique_abbrev_r(char*hex,const unsigned char*sha1,int len); 956 957externconst unsigned char null_sha1[GIT_MAX_RAWSZ]; 958externconst struct object_id null_oid; 959 960staticinlineinthashcmp(const unsigned char*sha1,const unsigned char*sha2) 961{ 962returnmemcmp(sha1, sha2, GIT_SHA1_RAWSZ); 963} 964 965staticinlineintoidcmp(const struct object_id *oid1,const struct object_id *oid2) 966{ 967returnhashcmp(oid1->hash, oid2->hash); 968} 969 970staticinlineintis_null_sha1(const unsigned char*sha1) 971{ 972return!hashcmp(sha1, null_sha1); 973} 974 975staticinlineintis_null_oid(const struct object_id *oid) 976{ 977return!hashcmp(oid->hash, null_sha1); 978} 979 980staticinlinevoidhashcpy(unsigned char*sha_dst,const unsigned char*sha_src) 981{ 982memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ); 983} 984 985staticinlinevoidoidcpy(struct object_id *dst,const struct object_id *src) 986{ 987hashcpy(dst->hash, src->hash); 988} 989 990staticinlinestruct object_id *oiddup(const struct object_id *src) 991{ 992struct object_id *dst =xmalloc(sizeof(struct object_id)); 993oidcpy(dst, src); 994return dst; 995} 996 997staticinlinevoidhashclr(unsigned char*hash) 998{ 999memset(hash,0, GIT_SHA1_RAWSZ);1000}10011002staticinlinevoidoidclr(struct object_id *oid)1003{1004hashclr(oid->hash);1005}100610071008#define EMPTY_TREE_SHA1_HEX \1009"4b825dc642cb6eb9a060e54bf8d69288fbee4904"1010#define EMPTY_TREE_SHA1_BIN_LITERAL \1011"\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \1012"\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"1013externconst struct object_id empty_tree_oid;1014#define EMPTY_TREE_SHA1_BIN (empty_tree_oid.hash)10151016#define EMPTY_BLOB_SHA1_HEX \1017"e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"1018#define EMPTY_BLOB_SHA1_BIN_LITERAL \1019"\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \1020"\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"1021externconst struct object_id empty_blob_oid;1022#define EMPTY_BLOB_SHA1_BIN (empty_blob_oid.hash)102310241025staticinlineintis_empty_blob_sha1(const unsigned char*sha1)1026{1027return!hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);1028}10291030staticinlineintis_empty_blob_oid(const struct object_id *oid)1031{1032return!hashcmp(oid->hash, EMPTY_BLOB_SHA1_BIN);1033}10341035staticinlineintis_empty_tree_sha1(const unsigned char*sha1)1036{1037return!hashcmp(sha1, EMPTY_TREE_SHA1_BIN);1038}10391040staticinlineintis_empty_tree_oid(const struct object_id *oid)1041{1042return!hashcmp(oid->hash, EMPTY_TREE_SHA1_BIN);1043}10441045/* set default permissions by passing mode arguments to open(2) */1046intgit_mkstemps_mode(char*pattern,int suffix_len,int mode);1047intgit_mkstemp_mode(char*pattern,int mode);10481049/*1050 * NOTE NOTE NOTE!!1051 *1052 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must1053 * not be changed. Old repositories have core.sharedrepository written in1054 * numeric format, and therefore these values are preserved for compatibility1055 * reasons.1056 */1057enum sharedrepo {1058 PERM_UMASK =0,1059 OLD_PERM_GROUP =1,1060 OLD_PERM_EVERYBODY =2,1061 PERM_GROUP =0660,1062 PERM_EVERYBODY =06641063};1064intgit_config_perm(const char*var,const char*value);1065intadjust_shared_perm(const char*path);10661067/*1068 * Create the directory containing the named path, using care to be1069 * somewhat safe against races. Return one of the scld_error values to1070 * indicate success/failure. On error, set errno to describe the1071 * problem.1072 *1073 * SCLD_VANISHED indicates that one of the ancestor directories of the1074 * path existed at one point during the function call and then1075 * suddenly vanished, probably because another process pruned the1076 * directory while we were working. To be robust against this kind of1077 * race, callers might want to try invoking the function again when it1078 * returns SCLD_VANISHED.1079 *1080 * safe_create_leading_directories() temporarily changes path while it1081 * is working but restores it before returning.1082 * safe_create_leading_directories_const() doesn't modify path, even1083 * temporarily.1084 */1085enum scld_error {1086 SCLD_OK =0,1087 SCLD_FAILED = -1,1088 SCLD_PERMS = -2,1089 SCLD_EXISTS = -3,1090 SCLD_VANISHED = -41091};1092enum scld_error safe_create_leading_directories(char*path);1093enum scld_error safe_create_leading_directories_const(const char*path);10941095/*1096 * Callback function for raceproof_create_file(). This function is1097 * expected to do something that makes dirname(path) permanent despite1098 * the fact that other processes might be cleaning up empty1099 * directories at the same time. Usually it will create a file named1100 * path, but alternatively it could create another file in that1101 * directory, or even chdir() into that directory. The function should1102 * return 0 if the action was completed successfully. On error, it1103 * should return a nonzero result and set errno.1104 * raceproof_create_file() treats two errno values specially:1105 *1106 * - ENOENT -- dirname(path) does not exist. In this case,1107 * raceproof_create_file() tries creating dirname(path)1108 * (and any parent directories, if necessary) and calls1109 * the function again.1110 *1111 * - EISDIR -- the file already exists and is a directory. In this1112 * case, raceproof_create_file() removes the directory if1113 * it is empty (and recursively any empty directories that1114 * it contains) and calls the function again.1115 *1116 * Any other errno causes raceproof_create_file() to fail with the1117 * callback's return value and errno.1118 *1119 * Obviously, this function should be OK with being called again if it1120 * fails with ENOENT or EISDIR. In other scenarios it will not be1121 * called again.1122 */1123typedefintcreate_file_fn(const char*path,void*cb);11241125/*1126 * Create a file in dirname(path) by calling fn, creating leading1127 * directories if necessary. Retry a few times in case we are racing1128 * with another process that is trying to clean up the directory that1129 * contains path. See the documentation for create_file_fn for more1130 * details.1131 *1132 * Return the value and set the errno that resulted from the most1133 * recent call of fn. fn is always called at least once, and will be1134 * called more than once if it returns ENOENT or EISDIR.1135 */1136intraceproof_create_file(const char*path, create_file_fn fn,void*cb);11371138intmkdir_in_gitdir(const char*path);1139externchar*expand_user_path(const char*path,int real_home);1140const char*enter_repo(const char*path,int strict);1141staticinlineintis_absolute_path(const char*path)1142{1143returnis_dir_sep(path[0]) ||has_dos_drive_prefix(path);1144}1145intis_directory(const char*);1146char*strbuf_realpath(struct strbuf *resolved,const char*path,1147int die_on_error);1148const char*real_path(const char*path);1149const char*real_path_if_valid(const char*path);1150char*real_pathdup(const char*path,int die_on_error);1151const char*absolute_path(const char*path);1152char*absolute_pathdup(const char*path);1153const char*remove_leading_path(const char*in,const char*prefix);1154const char*relative_path(const char*in,const char*prefix,struct strbuf *sb);1155intnormalize_path_copy_len(char*dst,const char*src,int*prefix_len);1156intnormalize_path_copy(char*dst,const char*src);1157intlongest_ancestor_length(const char*path,struct string_list *prefixes);1158char*strip_path_suffix(const char*path,const char*suffix);1159intdaemon_avoid_alias(const char*path);1160externintis_ntfs_dotgit(const char*name);11611162/*1163 * Returns true iff "str" could be confused as a command-line option when1164 * passed to a sub-program like "ssh". Note that this has nothing to do with1165 * shell-quoting, which should be handled separately; we're assuming here that1166 * the string makes it verbatim to the sub-program.1167 */1168intlooks_like_command_line_option(const char*str);11691170/**1171 * Return a newly allocated string with the evaluation of1172 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise1173 * "$HOME/.config/git/$filename". Return NULL upon error.1174 */1175externchar*xdg_config_home(const char*filename);11761177/**1178 * Return a newly allocated string with the evaluation of1179 * "$XDG_CACHE_HOME/git/$filename" if $XDG_CACHE_HOME is non-empty, otherwise1180 * "$HOME/.cache/git/$filename". Return NULL upon error.1181 */1182externchar*xdg_cache_home(const char*filename);11831184externvoid*read_sha1_file_extended(const unsigned char*sha1,1185enum object_type *type,1186unsigned long*size,int lookup_replace);1187staticinlinevoid*read_sha1_file(const unsigned char*sha1,enum object_type *type,unsigned long*size)1188{1189returnread_sha1_file_extended(sha1, type, size,1);1190}11911192/*1193 * This internal function is only declared here for the benefit of1194 * lookup_replace_object(). Please do not call it directly.1195 */1196externconst unsigned char*do_lookup_replace_object(const unsigned char*sha1);11971198/*1199 * If object sha1 should be replaced, return the replacement object's1200 * name (replaced recursively, if necessary). The return value is1201 * either sha1 or a pointer to a permanently-allocated value. When1202 * object replacement is suppressed, always return sha1.1203 */1204staticinlineconst unsigned char*lookup_replace_object(const unsigned char*sha1)1205{1206if(!check_replace_refs)1207return sha1;1208returndo_lookup_replace_object(sha1);1209}12101211/* Read and unpack a sha1 file into memory, write memory to a sha1 file */1212externintsha1_object_info(const unsigned char*,unsigned long*);1213externinthash_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*sha1);1214externintwrite_sha1_file(const void*buf,unsigned long len,const char*type,unsigned char*return_sha1);1215externinthash_sha1_file_literally(const void*buf,unsigned long len,const char*type,struct object_id *oid,unsigned flags);1216externintpretend_sha1_file(void*,unsigned long,enum object_type,unsigned char*);1217externintforce_object_loose(const unsigned char*sha1,time_t mtime);1218externintgit_open_cloexec(const char*name,int flags);1219#define git_open(name) git_open_cloexec(name, O_RDONLY)1220externvoid*map_sha1_file(const unsigned char*sha1,unsigned long*size);1221externintunpack_sha1_header(git_zstream *stream,unsigned char*map,unsigned long mapsize,void*buffer,unsigned long bufsiz);1222externintparse_sha1_header(const char*hdr,unsigned long*sizep);12231224externintcheck_sha1_signature(const unsigned char*sha1,void*buf,unsigned long size,const char*type);12251226externintfinalize_object_file(const char*tmpfile,const char*filename);12271228/*1229 * Open the loose object at path, check its sha1, and return the contents,1230 * type, and size. If the object is a blob, then "contents" may return NULL,1231 * to allow streaming of large blobs.1232 *1233 * Returns 0 on success, negative on error (details may be written to stderr).1234 */1235intread_loose_object(const char*path,1236const unsigned char*expected_sha1,1237enum object_type *type,1238unsigned long*size,1239void**contents);12401241/*1242 * Convenience for sha1_object_info_extended() with a NULL struct1243 * object_info. OBJECT_INFO_SKIP_CACHED is automatically set; pass1244 * nonzero flags to also set other flags.1245 */1246externinthas_sha1_file_with_flags(const unsigned char*sha1,int flags);1247staticinlineinthas_sha1_file(const unsigned char*sha1)1248{1249returnhas_sha1_file_with_flags(sha1,0);1250}12511252/* Same as the above, except for struct object_id. */1253externinthas_object_file(const struct object_id *oid);1254externinthas_object_file_with_flags(const struct object_id *oid,int flags);12551256/*1257 * Return true iff an alternate object database has a loose object1258 * with the specified name. This function does not respect replace1259 * references.1260 */1261externinthas_loose_object_nonlocal(const unsigned char*sha1);12621263externvoidassert_sha1_type(const unsigned char*sha1,enum object_type expect);12641265/* Helper to check and "touch" a file */1266externintcheck_and_freshen_file(const char*fn,int freshen);12671268externconst signed char hexval_table[256];1269staticinlineunsigned inthexval(unsigned char c)1270{1271return hexval_table[c];1272}12731274/*1275 * Convert two consecutive hexadecimal digits into a char. Return a1276 * negative value on error. Don't run over the end of short strings.1277 */1278staticinlineinthex2chr(const char*s)1279{1280unsigned int val =hexval(s[0]);1281return(val & ~0xf) ? val : (val <<4) |hexval(s[1]);1282}12831284/* Convert to/from hex/sha1 representation */1285#define MINIMUM_ABBREV minimum_abbrev1286#define DEFAULT_ABBREV default_abbrev12871288/* used when the code does not know or care what the default abbrev is */1289#define FALLBACK_DEFAULT_ABBREV 712901291struct object_context {1292unsigned char tree[20];1293unsigned mode;1294/*1295 * symlink_path is only used by get_tree_entry_follow_symlinks,1296 * and only for symlinks that point outside the repository.1297 */1298struct strbuf symlink_path;1299/*1300 * If GET_OID_RECORD_PATH is set, this will record path (if any)1301 * found when resolving the name. The caller is responsible for1302 * releasing the memory.1303 */1304char*path;1305};13061307#define GET_OID_QUIETLY 011308#define GET_OID_COMMIT 021309#define GET_OID_COMMITTISH 041310#define GET_OID_TREE 0101311#define GET_OID_TREEISH 0201312#define GET_OID_BLOB 0401313#define GET_OID_FOLLOW_SYMLINKS 01001314#define GET_OID_RECORD_PATH 02001315#define GET_OID_ONLY_TO_DIE 0400013161317#define GET_OID_DISAMBIGUATORS \1318 (GET_OID_COMMIT | GET_OID_COMMITTISH | \1319 GET_OID_TREE | GET_OID_TREEISH | \1320 GET_OID_BLOB)13211322externintget_oid(const char*str,struct object_id *oid);1323externintget_oid_commit(const char*str,struct object_id *oid);1324externintget_oid_committish(const char*str,struct object_id *oid);1325externintget_oid_tree(const char*str,struct object_id *oid);1326externintget_oid_treeish(const char*str,struct object_id *oid);1327externintget_oid_blob(const char*str,struct object_id *oid);1328externvoidmaybe_die_on_misspelt_object_name(const char*name,const char*prefix);1329externintget_oid_with_context(const char*str,unsigned flags,struct object_id *oid,struct object_context *oc);133013311332typedefinteach_abbrev_fn(const struct object_id *oid,void*);1333externintfor_each_abbrev(const char*prefix, each_abbrev_fn,void*);13341335externintset_disambiguate_hint_config(const char*var,const char*value);13361337/*1338 * Try to read a SHA1 in hexadecimal format from the 40 characters1339 * starting at hex. Write the 20-byte result to sha1 in binary form.1340 * Return 0 on success. Reading stops if a NUL is encountered in the1341 * input, so it is safe to pass this function an arbitrary1342 * null-terminated string.1343 */1344externintget_sha1_hex(const char*hex,unsigned char*sha1);1345externintget_oid_hex(const char*hex,struct object_id *sha1);13461347/*1348 * Read `len` pairs of hexadecimal digits from `hex` and write the1349 * values to `binary` as `len` bytes. Return 0 on success, or -1 if1350 * the input does not consist of hex digits).1351 */1352externinthex_to_bytes(unsigned char*binary,const char*hex,size_t len);13531354/*1355 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,1356 * and writes the NUL-terminated output to the buffer `out`, which must be at1357 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for1358 * convenience.1359 *1360 * The non-`_r` variant returns a static buffer, but uses a ring of 41361 * buffers, making it safe to make multiple calls for a single statement, like:1362 *1363 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));1364 */1365externchar*sha1_to_hex_r(char*out,const unsigned char*sha1);1366externchar*oid_to_hex_r(char*out,const struct object_id *oid);1367externchar*sha1_to_hex(const unsigned char*sha1);/* static buffer result! */1368externchar*oid_to_hex(const struct object_id *oid);/* same static buffer as sha1_to_hex */13691370/*1371 * Parse a 40-character hexadecimal object ID starting from hex, updating the1372 * pointer specified by end when parsing stops. The resulting object ID is1373 * stored in oid. Returns 0 on success. Parsing will stop on the first NUL or1374 * other invalid character. end is only updated on success; otherwise, it is1375 * unmodified.1376 */1377externintparse_oid_hex(const char*hex,struct object_id *oid,const char**end);13781379/*1380 * This reads short-hand syntax that not only evaluates to a commit1381 * object name, but also can act as if the end user spelled the name1382 * of the branch from the command line.1383 *1384 * - "@{-N}" finds the name of the Nth previous branch we were on, and1385 * places the name of the branch in the given buf and returns the1386 * number of characters parsed if successful.1387 *1388 * - "<branch>@{upstream}" finds the name of the other ref that1389 * <branch> is configured to merge with (missing <branch> defaults1390 * to the current branch), and places the name of the branch in the1391 * given buf and returns the number of characters parsed if1392 * successful.1393 *1394 * If the input is not of the accepted format, it returns a negative1395 * number to signal an error.1396 *1397 * If the input was ok but there are not N branch switches in the1398 * reflog, it returns 0.1399 *1400 * If "allowed" is non-zero, it is a treated as a bitfield of allowable1401 * expansions: local branches ("refs/heads/"), remote branches1402 * ("refs/remotes/"), or "HEAD". If no "allowed" bits are set, any expansion is1403 * allowed, even ones to refs outside of those namespaces.1404 */1405#define INTERPRET_BRANCH_LOCAL (1<<0)1406#define INTERPRET_BRANCH_REMOTE (1<<1)1407#define INTERPRET_BRANCH_HEAD (1<<2)1408externintinterpret_branch_name(const char*str,int len,struct strbuf *,1409unsigned allowed);1410externintget_oid_mb(const char*str,struct object_id *oid);14111412externintvalidate_headref(const char*ref);14131414externintbase_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1415externintdf_name_compare(const char*name1,int len1,int mode1,const char*name2,int len2,int mode2);1416externintname_compare(const char*name1,size_t len1,const char*name2,size_t len2);1417externintcache_name_stage_compare(const char*name1,int len1,int stage1,const char*name2,int len2,int stage2);14181419externvoid*read_object_with_reference(const unsigned char*sha1,1420const char*required_type,1421unsigned long*size,1422unsigned char*sha1_ret);14231424externstruct object *peel_to_type(const char*name,int namelen,1425struct object *o,enum object_type);14261427struct date_mode {1428enum date_mode_type {1429 DATE_NORMAL =0,1430 DATE_RELATIVE,1431 DATE_SHORT,1432 DATE_ISO8601,1433 DATE_ISO8601_STRICT,1434 DATE_RFC2822,1435 DATE_STRFTIME,1436 DATE_RAW,1437 DATE_UNIX1438} type;1439const char*strftime_fmt;1440int local;1441};14421443/*1444 * Convenience helper for passing a constant type, like:1445 *1446 * show_date(t, tz, DATE_MODE(NORMAL));1447 */1448#define DATE_MODE(t) date_mode_from_type(DATE_##t)1449struct date_mode *date_mode_from_type(enum date_mode_type type);14501451const char*show_date(timestamp_t time,int timezone,const struct date_mode *mode);1452voidshow_date_relative(timestamp_t time,int tz,const struct timeval *now,1453struct strbuf *timebuf);1454intparse_date(const char*date,struct strbuf *out);1455intparse_date_basic(const char*date, timestamp_t *timestamp,int*offset);1456intparse_expiry_date(const char*date, timestamp_t *timestamp);1457voiddatestamp(struct strbuf *out);1458#define approxidate(s) approxidate_careful((s), NULL)1459timestamp_t approxidate_careful(const char*,int*);1460timestamp_t approxidate_relative(const char*date,const struct timeval *now);1461voidparse_date_format(const char*format,struct date_mode *mode);1462intdate_overflows(timestamp_t date);14631464#define IDENT_STRICT 11465#define IDENT_NO_DATE 21466#define IDENT_NO_NAME 41467externconst char*git_author_info(int);1468externconst char*git_committer_info(int);1469externconst char*fmt_ident(const char*name,const char*email,const char*date_str,int);1470externconst char*fmt_name(const char*name,const char*email);1471externconst char*ident_default_name(void);1472externconst char*ident_default_email(void);1473externconst char*git_editor(void);1474externconst char*git_pager(int stdout_is_tty);1475externintgit_ident_config(const char*,const char*,void*);1476externvoidreset_ident_date(void);14771478struct ident_split {1479const char*name_begin;1480const char*name_end;1481const char*mail_begin;1482const char*mail_end;1483const char*date_begin;1484const char*date_end;1485const char*tz_begin;1486const char*tz_end;1487};1488/*1489 * Signals an success with 0, but time part of the result may be NULL1490 * if the input lacks timestamp and zone1491 */1492externintsplit_ident_line(struct ident_split *,const char*,int);14931494/*1495 * Like show_date, but pull the timestamp and tz parameters from1496 * the ident_split. It will also sanity-check the values and produce1497 * a well-known sentinel date if they appear bogus.1498 */1499const char*show_ident_date(const struct ident_split *id,1500const struct date_mode *mode);15011502/*1503 * Compare split idents for equality or strict ordering. Note that we1504 * compare only the ident part of the line, ignoring any timestamp.1505 *1506 * Because there are two fields, we must choose one as the primary key; we1507 * currently arbitrarily pick the email.1508 */1509externintident_cmp(const struct ident_split *,const struct ident_split *);15101511struct checkout {1512struct index_state *istate;1513const char*base_dir;1514int base_dir_len;1515struct delayed_checkout *delayed_checkout;1516unsigned force:1,1517 quiet:1,1518 not_new:1,1519 refresh_cache:1;1520};1521#define CHECKOUT_INIT { NULL,"" }15221523#define TEMPORARY_FILENAME_LENGTH 251524externintcheckout_entry(struct cache_entry *ce,const struct checkout *state,char*topath);1525externvoidenable_delayed_checkout(struct checkout *state);1526externintfinish_delayed_checkout(struct checkout *state);15271528struct cache_def {1529struct strbuf path;1530int flags;1531int track_flags;1532int prefix_len_stat_func;1533};1534#define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }1535staticinlinevoidcache_def_clear(struct cache_def *cache)1536{1537strbuf_release(&cache->path);1538}15391540externinthas_symlink_leading_path(const char*name,int len);1541externintthreaded_has_symlink_leading_path(struct cache_def *,const char*,int);1542externintcheck_leading_path(const char*name,int len);1543externinthas_dirs_only_path(const char*name,int len,int prefix_len);1544externvoidschedule_dir_for_removal(const char*name,int len);1545externvoidremove_scheduled_dirs(void);15461547externstruct alternate_object_database {1548struct alternate_object_database *next;15491550/* see alt_scratch_buf() */1551struct strbuf scratch;1552size_t base_len;15531554/*1555 * Used to store the results of readdir(3) calls when searching1556 * for unique abbreviated hashes. This cache is never1557 * invalidated, thus it's racy and not necessarily accurate.1558 * That's fine for its purpose; don't use it for tasks requiring1559 * greater accuracy!1560 */1561char loose_objects_subdir_seen[256];1562struct oid_array loose_objects_cache;15631564char path[FLEX_ARRAY];1565} *alt_odb_list;1566externvoidprepare_alt_odb(void);1567externchar*compute_alternate_path(const char*path,struct strbuf *err);1568typedefintalt_odb_fn(struct alternate_object_database *,void*);1569externintforeach_alt_odb(alt_odb_fn,void*);15701571/*1572 * Allocate a "struct alternate_object_database" but do _not_ actually1573 * add it to the list of alternates.1574 */1575struct alternate_object_database *alloc_alt_odb(const char*dir);15761577/*1578 * Add the directory to the on-disk alternates file; the new entry will also1579 * take effect in the current process.1580 */1581externvoidadd_to_alternates_file(const char*dir);15821583/*1584 * Add the directory to the in-memory list of alternates (along with any1585 * recursive alternates it points to), but do not modify the on-disk alternates1586 * file.1587 */1588externvoidadd_to_alternates_memory(const char*dir);15891590/*1591 * Returns a scratch strbuf pre-filled with the alternate object directory,1592 * including a trailing slash, which can be used to access paths in the1593 * alternate. Always use this over direct access to alt->scratch, as it1594 * cleans up any previous use of the scratch buffer.1595 */1596externstruct strbuf *alt_scratch_buf(struct alternate_object_database *alt);15971598struct pack_window {1599struct pack_window *next;1600unsigned char*base;1601 off_t offset;1602size_t len;1603unsigned int last_used;1604unsigned int inuse_cnt;1605};16061607externstruct packed_git {1608struct packed_git *next;1609struct pack_window *windows;1610 off_t pack_size;1611const void*index_data;1612size_t index_size;1613uint32_t num_objects;1614uint32_t num_bad_objects;1615unsigned char*bad_object_sha1;1616int index_version;1617time_t mtime;1618int pack_fd;1619unsigned pack_local:1,1620 pack_keep:1,1621 freshened:1,1622 do_not_close:1;1623unsigned char sha1[20];1624struct revindex_entry *revindex;1625/* something like ".git/objects/pack/xxxxx.pack" */1626char pack_name[FLEX_ARRAY];/* more */1627} *packed_git;16281629/*1630 * A most-recently-used ordered version of the packed_git list, which can1631 * be iterated instead of packed_git (and marked via mru_mark).1632 */1633externstruct mru packed_git_mru;16341635struct pack_entry {1636 off_t offset;1637unsigned char sha1[20];1638struct packed_git *p;1639};16401641/*1642 * Create a temporary file rooted in the object database directory, or1643 * die on failure. The filename is taken from "pattern", which should have the1644 * usual "XXXXXX" trailer, and the resulting filename is written into the1645 * "template" buffer. Returns the open descriptor.1646 */1647externintodb_mkstemp(struct strbuf *template,const char*pattern);16481649/*1650 * Create a pack .keep file named "name" (which should generally be the output1651 * of odb_pack_name). Returns a file descriptor opened for writing, or -1 on1652 * error.1653 */1654externintodb_pack_keep(const char*name);16551656/*1657 * Iterate over the files in the loose-object parts of the object1658 * directory "path", triggering the following callbacks:1659 *1660 * - loose_object is called for each loose object we find.1661 *1662 * - loose_cruft is called for any files that do not appear to be1663 * loose objects. Note that we only look in the loose object1664 * directories "objects/[0-9a-f]{2}/", so we will not report1665 * "objects/foobar" as cruft.1666 *1667 * - loose_subdir is called for each top-level hashed subdirectory1668 * of the object directory (e.g., "$OBJDIR/f0"). It is called1669 * after the objects in the directory are processed.1670 *1671 * Any callback that is NULL will be ignored. Callbacks returning non-zero1672 * will end the iteration.1673 *1674 * In the "buf" variant, "path" is a strbuf which will also be used as a1675 * scratch buffer, but restored to its original contents before1676 * the function returns.1677 */1678typedefinteach_loose_object_fn(const struct object_id *oid,1679const char*path,1680void*data);1681typedefinteach_loose_cruft_fn(const char*basename,1682const char*path,1683void*data);1684typedefinteach_loose_subdir_fn(unsigned int nr,1685const char*path,1686void*data);1687intfor_each_file_in_obj_subdir(unsigned int subdir_nr,1688struct strbuf *path,1689 each_loose_object_fn obj_cb,1690 each_loose_cruft_fn cruft_cb,1691 each_loose_subdir_fn subdir_cb,1692void*data);1693intfor_each_loose_file_in_objdir(const char*path,1694 each_loose_object_fn obj_cb,1695 each_loose_cruft_fn cruft_cb,1696 each_loose_subdir_fn subdir_cb,1697void*data);1698intfor_each_loose_file_in_objdir_buf(struct strbuf *path,1699 each_loose_object_fn obj_cb,1700 each_loose_cruft_fn cruft_cb,1701 each_loose_subdir_fn subdir_cb,1702void*data);17031704/*1705 * Iterate over loose objects in both the local1706 * repository and any alternates repositories (unless the1707 * LOCAL_ONLY flag is set).1708 */1709#define FOR_EACH_OBJECT_LOCAL_ONLY 0x11710externintfor_each_loose_object(each_loose_object_fn,void*,unsigned flags);17111712struct object_info {1713/* Request */1714enum object_type *typep;1715unsigned long*sizep;1716 off_t *disk_sizep;1717unsigned char*delta_base_sha1;1718struct strbuf *typename;1719void**contentp;17201721/* Response */1722enum{1723 OI_CACHED,1724 OI_LOOSE,1725 OI_PACKED,1726 OI_DBCACHED1727} whence;1728union{1729/*1730 * struct {1731 * ... Nothing to expose in this case1732 * } cached;1733 * struct {1734 * ... Nothing to expose in this case1735 * } loose;1736 */1737struct{1738struct packed_git *pack;1739 off_t offset;1740unsigned int is_delta;1741} packed;1742} u;1743};17441745/*1746 * Initializer for a "struct object_info" that wants no items. You may1747 * also memset() the memory to all-zeroes.1748 */1749#define OBJECT_INFO_INIT {NULL}17501751/* Invoke lookup_replace_object() on the given hash */1752#define OBJECT_INFO_LOOKUP_REPLACE 11753/* Allow reading from a loose object file of unknown/bogus type */1754#define OBJECT_INFO_ALLOW_UNKNOWN_TYPE 21755/* Do not check cached storage */1756#define OBJECT_INFO_SKIP_CACHED 41757/* Do not retry packed storage after checking packed and loose storage */1758#define OBJECT_INFO_QUICK 81759externintsha1_object_info_extended(const unsigned char*,struct object_info *,unsigned flags);17601761/* Dumb servers support */1762externintupdate_server_info(int);17631764externconst char*get_log_output_encoding(void);1765externconst char*get_commit_output_encoding(void);17661767/*1768 * This is a hack for test programs like test-dump-untracked-cache to1769 * ensure that they do not modify the untracked cache when reading it.1770 * Do not use it otherwise!1771 */1772externint ignore_untracked_cache_config;17731774externintcommitter_ident_sufficiently_given(void);1775externintauthor_ident_sufficiently_given(void);17761777externconst char*git_commit_encoding;1778externconst char*git_log_output_encoding;1779externconst char*git_mailmap_file;1780externconst char*git_mailmap_blob;17811782/* IO helper functions */1783externvoidmaybe_flush_or_die(FILE*,const char*);1784__attribute__((format(printf,2,3)))1785externvoidfprintf_or_die(FILE*,const char*fmt, ...);17861787#define COPY_READ_ERROR (-2)1788#define COPY_WRITE_ERROR (-3)1789externintcopy_fd(int ifd,int ofd);1790externintcopy_file(const char*dst,const char*src,int mode);1791externintcopy_file_with_time(const char*dst,const char*src,int mode);17921793externvoidwrite_or_die(int fd,const void*buf,size_t count);1794externvoidfsync_or_die(int fd,const char*);17951796extern ssize_t read_in_full(int fd,void*buf,size_t count);1797extern ssize_t write_in_full(int fd,const void*buf,size_t count);1798extern ssize_t pread_in_full(int fd,void*buf,size_t count, off_t offset);17991800staticinline ssize_t write_str_in_full(int fd,const char*str)1801{1802returnwrite_in_full(fd, str,strlen(str));1803}18041805/**1806 * Open (and truncate) the file at path, write the contents of buf to it,1807 * and close it. Dies if any errors are encountered.1808 */1809externvoidwrite_file_buf(const char*path,const char*buf,size_t len);18101811/**1812 * Like write_file_buf(), but format the contents into a buffer first.1813 * Additionally, write_file() will append a newline if one is not already1814 * present, making it convenient to write text files:1815 *1816 * write_file(path, "counter: %d", ctr);1817 */1818__attribute__((format(printf,2,3)))1819externvoidwrite_file(const char*path,const char*fmt, ...);18201821/* pager.c */1822externvoidsetup_pager(void);1823externintpager_in_use(void);1824externint pager_use_color;1825externintterm_columns(void);1826externintdecimal_width(uintmax_t);1827externintcheck_pager_config(const char*cmd);1828externvoidprepare_pager_args(struct child_process *,const char*pager);18291830externconst char*editor_program;1831externconst char*askpass_program;1832externconst char*excludes_file;18331834/* base85 */1835intdecode_85(char*dst,const char*line,int linelen);1836voidencode_85(char*buf,const unsigned char*data,int bytes);18371838/* alloc.c */1839externvoid*alloc_blob_node(void);1840externvoid*alloc_tree_node(void);1841externvoid*alloc_commit_node(void);1842externvoid*alloc_tag_node(void);1843externvoid*alloc_object_node(void);1844externvoidalloc_report(void);1845externunsigned intalloc_commit_index(void);18461847/* pkt-line.c */1848voidpacket_trace_identity(const char*prog);18491850/* add */1851/*1852 * return 0 if success, 1 - if addition of a file failed and1853 * ADD_FILES_IGNORE_ERRORS was specified in flags1854 */1855intadd_files_to_cache(const char*prefix,const struct pathspec *pathspec,int flags);18561857/* diff.c */1858externint diff_auto_refresh_index;18591860/* match-trees.c */1861voidshift_tree(const struct object_id *,const struct object_id *,struct object_id *,int);1862voidshift_tree_by(const struct object_id *,const struct object_id *,struct object_id *,const char*);18631864/*1865 * whitespace rules.1866 * used by both diff and apply1867 * last two digits are tab width1868 */1869#define WS_BLANK_AT_EOL 01001870#define WS_SPACE_BEFORE_TAB 02001871#define WS_INDENT_WITH_NON_TAB 04001872#define WS_CR_AT_EOL 010001873#define WS_BLANK_AT_EOF 020001874#define WS_TAB_IN_INDENT 040001875#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)1876#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)1877#define WS_TAB_WIDTH_MASK 0771878/* All WS_* -- when extended, adapt diff.c emit_symbol */1879#define WS_RULE_MASK 077771880externunsigned whitespace_rule_cfg;1881externunsignedwhitespace_rule(const char*);1882externunsignedparse_whitespace_rule(const char*);1883externunsignedws_check(const char*line,int len,unsigned ws_rule);1884externvoidws_check_emit(const char*line,int len,unsigned ws_rule,FILE*stream,const char*set,const char*reset,const char*ws);1885externchar*whitespace_error_string(unsigned ws);1886externvoidws_fix_copy(struct strbuf *,const char*,int,unsigned,int*);1887externintws_blank_line(const char*line,int len,unsigned ws_rule);1888#define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)18891890/* ls-files */1891voidoverlay_tree_on_index(struct index_state *istate,1892const char*tree_name,const char*prefix);18931894char*alias_lookup(const char*alias);1895intsplit_cmdline(char*cmdline,const char***argv);1896/* Takes a negative value returned by split_cmdline */1897const char*split_cmdline_strerror(int cmdline_errno);18981899/* setup.c */1900struct startup_info {1901int have_repository;1902const char*prefix;1903};1904externstruct startup_info *startup_info;19051906/* merge.c */1907struct commit_list;1908inttry_merge_command(const char*strategy,size_t xopts_nr,1909const char**xopts,struct commit_list *common,1910const char*head_arg,struct commit_list *remotes);1911intcheckout_fast_forward(const struct object_id *from,1912const struct object_id *to,1913int overwrite_ignore);191419151916intsane_execvp(const char*file,char*const argv[]);19171918/*1919 * A struct to encapsulate the concept of whether a file has changed1920 * since we last checked it. This uses criteria similar to those used1921 * for the index.1922 */1923struct stat_validity {1924struct stat_data *sd;1925};19261927voidstat_validity_clear(struct stat_validity *sv);19281929/*1930 * Returns 1 if the path is a regular file (or a symlink to a regular1931 * file) and matches the saved stat_validity, 0 otherwise. A missing1932 * or inaccessible file is considered a match if the struct was just1933 * initialized, or if the previous update found an inaccessible file.1934 */1935intstat_validity_check(struct stat_validity *sv,const char*path);19361937/*1938 * Update the stat_validity from a file opened at descriptor fd. If1939 * the file is missing, inaccessible, or not a regular file, then1940 * future calls to stat_validity_check will match iff one of those1941 * conditions continues to be true.1942 */1943voidstat_validity_update(struct stat_validity *sv,int fd);19441945intversioncmp(const char*s1,const char*s2);1946voidsleep_millisec(int millisec);19471948/*1949 * Create a directory and (if share is nonzero) adjust its permissions1950 * according to the shared_repository setting. Only use this for1951 * directories under $GIT_DIR. Don't use it for working tree1952 * directories.1953 */1954voidsafe_create_dir(const char*dir,int share);19551956#endif/* CACHE_H */