Andrew's git - gitweb.git/blob

   1#ifndef CACHE_H
   2#define CACHE_H
   3
   4#include "git-compat-util.h"
   5#include "strbuf.h"
   6#include "hash.h"
   7
   8#include SHA1_HEADER
   9#ifndef git_SHA_CTX
  10#define git_SHA_CTX     SHA_CTX
  11#define git_SHA1_Init   SHA1_Init
  12#define git_SHA1_Update SHA1_Update
  13#define git_SHA1_Final  SHA1_Final
  14#endif
  15
  16#include <zlib.h>
  17#if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  18#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  19#endif
  20
  21void git_inflate_init(z_streamp strm);
  22void git_inflate_end(z_streamp strm);
  23int git_inflate(z_streamp strm, int flush);
  24
  25#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  26#define DTYPE(de)       ((de)->d_type)
  27#else
  28#undef DT_UNKNOWN
  29#undef DT_DIR
  30#undef DT_REG
  31#undef DT_LNK
  32#define DT_UNKNOWN      0
  33#define DT_DIR          1
  34#define DT_REG          2
  35#define DT_LNK          3
  36#define DTYPE(de)       DT_UNKNOWN
  37#endif
  38
  39/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  40#define S_IFINVALID     0030000
  41
  42/*
  43 * A "directory link" is a link to another git directory.
  44 *
  45 * The value 0160000 is not normally a valid mode, and
  46 * also just happens to be S_IFDIR + S_IFLNK
  47 *
  48 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  49 * always having the same values everywhere. We should use
  50 * our internal git values for these things, and then we can
  51 * translate that to the OS-specific value. It just so
  52 * happens that everybody shares the same bit representation
  53 * in the UNIX world (and apparently wider too..)
  54 */
  55#define S_IFGITLINK     0160000
  56#define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  57
  58/*
  59 * Intensive research over the course of many years has shown that
  60 * port 9418 is totally unused by anything else. Or
  61 *
  62 *      Your search - "port 9418" - did not match any documents.
  63 *
  64 * as www.google.com puts it.
  65 *
  66 * This port has been properly assigned for git use by IANA:
  67 * git (Assigned-9418) [I06-050728-0001].
  68 *
  69 *      git  9418/tcp   git pack transfer service
  70 *      git  9418/udp   git pack transfer service
  71 *
  72 * with Linus Torvalds <torvalds@osdl.org> as the point of
  73 * contact. September 2005.
  74 *
  75 * See http://www.iana.org/assignments/port-numbers
  76 */
  77#define DEFAULT_GIT_PORT 9418
  78
  79/*
  80 * Basic data structures for the directory cache
  81 */
  82
  83#define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  84struct cache_header {
  85        unsigned int hdr_signature;
  86        unsigned int hdr_version;
  87        unsigned int hdr_entries;
  88};
  89
  90/*
  91 * The "cache_time" is just the low 32 bits of the
  92 * time. It doesn't matter if it overflows - we only
  93 * check it for equality in the 32 bits we save.
  94 */
  95struct cache_time {
  96        unsigned int sec;
  97        unsigned int nsec;
  98};
  99
 100/*
 101 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
 102 * Again - this is just a (very strong in practice) heuristic that
 103 * the inode hasn't changed.
 104 *
 105 * We save the fields in big-endian order to allow using the
 106 * index file over NFS transparently.
 107 */
 108struct ondisk_cache_entry {
 109        struct cache_time ctime;
 110        struct cache_time mtime;
 111        unsigned int dev;
 112        unsigned int ino;
 113        unsigned int mode;
 114        unsigned int uid;
 115        unsigned int gid;
 116        unsigned int size;
 117        unsigned char sha1[20];
 118        unsigned short flags;
 119        char name[FLEX_ARRAY]; /* more */
 120};
 121
 122/*
 123 * This struct is used when CE_EXTENDED bit is 1
 124 * The struct must match ondisk_cache_entry exactly from
 125 * ctime till flags
 126 */
 127struct ondisk_cache_entry_extended {
 128        struct cache_time ctime;
 129        struct cache_time mtime;
 130        unsigned int dev;
 131        unsigned int ino;
 132        unsigned int mode;
 133        unsigned int uid;
 134        unsigned int gid;
 135        unsigned int size;
 136        unsigned char sha1[20];
 137        unsigned short flags;
 138        unsigned short flags2;
 139        char name[FLEX_ARRAY]; /* more */
 140};
 141
 142struct cache_entry {
 143        struct cache_time ce_ctime;
 144        struct cache_time ce_mtime;
 145        unsigned int ce_dev;
 146        unsigned int ce_ino;
 147        unsigned int ce_mode;
 148        unsigned int ce_uid;
 149        unsigned int ce_gid;
 150        unsigned int ce_size;
 151        unsigned int ce_flags;
 152        unsigned char sha1[20];
 153        struct cache_entry *next;
 154        char name[FLEX_ARRAY]; /* more */
 155};
 156
 157#define CE_NAMEMASK  (0x0fff)
 158#define CE_STAGEMASK (0x3000)
 159#define CE_EXTENDED  (0x4000)
 160#define CE_VALID     (0x8000)
 161#define CE_STAGESHIFT 12
 162
 163/*
 164 * Range 0xFFFF0000 in ce_flags is divided into
 165 * two parts: in-memory flags and on-disk ones.
 166 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
 167 * if you want to save a new flag, add it in
 168 * CE_EXTENDED_FLAGS
 169 *
 170 * In-memory only flags
 171 */
 172#define CE_UPDATE    (0x10000)
 173#define CE_REMOVE    (0x20000)
 174#define CE_UPTODATE  (0x40000)
 175#define CE_ADDED     (0x80000)
 176
 177#define CE_HASHED    (0x100000)
 178#define CE_UNHASHED  (0x200000)
 179
 180/*
 181 * Extended on-disk flags
 182 */
 183#define CE_INTENT_TO_ADD 0x20000000
 184/* CE_EXTENDED2 is for future extension */
 185#define CE_EXTENDED2 0x80000000
 186
 187#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD)
 188
 189/*
 190 * Safeguard to avoid saving wrong flags:
 191 *  - CE_EXTENDED2 won't get saved until its semantic is known
 192 *  - Bits in 0x0000FFFF have been saved in ce_flags already
 193 *  - Bits in 0x003F0000 are currently in-memory flags
 194 */
 195#if CE_EXTENDED_FLAGS & 0x803FFFFF
 196#error "CE_EXTENDED_FLAGS out of range"
 197#endif
 198
 199/*
 200 * Copy the sha1 and stat state of a cache entry from one to
 201 * another. But we never change the name, or the hash state!
 202 */
 203#define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 204static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 205{
 206        unsigned int state = dst->ce_flags & CE_STATE_MASK;
 207
 208        /* Don't copy hash chain and name */
 209        memcpy(dst, src, offsetof(struct cache_entry, next));
 210
 211        /* Restore the hash state */
 212        dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 213}
 214
 215static inline unsigned create_ce_flags(size_t len, unsigned stage)
 216{
 217        if (len >= CE_NAMEMASK)
 218                len = CE_NAMEMASK;
 219        return (len | (stage << CE_STAGESHIFT));
 220}
 221
 222static inline size_t ce_namelen(const struct cache_entry *ce)
 223{
 224        size_t len = ce->ce_flags & CE_NAMEMASK;
 225        if (len < CE_NAMEMASK)
 226                return len;
 227        return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 228}
 229
 230#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 231#define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \
 232                            ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
 233                            ondisk_cache_entry_size(ce_namelen(ce)))
 234#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 235#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 236#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 237
 238#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 239static inline unsigned int create_ce_mode(unsigned int mode)
 240{
 241        if (S_ISLNK(mode))
 242                return S_IFLNK;
 243        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 244                return S_IFGITLINK;
 245        return S_IFREG | ce_permissions(mode);
 246}
 247static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 248{
 249        extern int trust_executable_bit, has_symlinks;
 250        if (!has_symlinks && S_ISREG(mode) &&
 251            ce && S_ISLNK(ce->ce_mode))
 252                return ce->ce_mode;
 253        if (!trust_executable_bit && S_ISREG(mode)) {
 254                if (ce && S_ISREG(ce->ce_mode))
 255                        return ce->ce_mode;
 256                return create_ce_mode(0666);
 257        }
 258        return create_ce_mode(mode);
 259}
 260static inline int ce_to_dtype(const struct cache_entry *ce)
 261{
 262        unsigned ce_mode = ntohl(ce->ce_mode);
 263        if (S_ISREG(ce_mode))
 264                return DT_REG;
 265        else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 266                return DT_DIR;
 267        else if (S_ISLNK(ce_mode))
 268                return DT_LNK;
 269        else
 270                return DT_UNKNOWN;
 271}
 272#define canon_mode(mode) \
 273        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 274        S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 275
 276#define flexible_size(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
 277#define cache_entry_size(len) flexible_size(cache_entry,len)
 278#define ondisk_cache_entry_size(len) flexible_size(ondisk_cache_entry,len)
 279#define ondisk_cache_entry_extended_size(len) flexible_size(ondisk_cache_entry_extended,len)
 280
 281struct index_state {
 282        struct cache_entry **cache;
 283        unsigned int cache_nr, cache_alloc, cache_changed;
 284        struct cache_tree *cache_tree;
 285        struct cache_time timestamp;
 286        void *alloc;
 287        unsigned name_hash_initialized : 1,
 288                 initialized : 1;
 289        struct hash_table name_hash;
 290};
 291
 292extern struct index_state the_index;
 293
 294/* Name hashing */
 295extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 296/*
 297 * We don't actually *remove* it, we can just mark it invalid so that
 298 * we won't find it in lookups.
 299 *
 300 * Not only would we have to search the lists (simple enough), but
 301 * we'd also have to rehash other hash buckets in case this makes the
 302 * hash bucket empty (common). So it's much better to just mark
 303 * it.
 304 */
 305static inline void remove_name_hash(struct cache_entry *ce)
 306{
 307        ce->ce_flags |= CE_UNHASHED;
 308}
 309
 310
 311#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 312#define active_cache (the_index.cache)
 313#define active_nr (the_index.cache_nr)
 314#define active_alloc (the_index.cache_alloc)
 315#define active_cache_changed (the_index.cache_changed)
 316#define active_cache_tree (the_index.cache_tree)
 317
 318#define read_cache() read_index(&the_index)
 319#define read_cache_from(path) read_index_from(&the_index, (path))
 320#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 321#define is_cache_unborn() is_index_unborn(&the_index)
 322#define read_cache_unmerged() read_index_unmerged(&the_index)
 323#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 324#define discard_cache() discard_index(&the_index)
 325#define unmerged_cache() unmerged_index(&the_index)
 326#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 327#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 328#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 329#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 330#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 331#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 332#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 333#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 334#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 335#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 336#define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 337#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 338#endif
 339
 340enum object_type {
 341        OBJ_BAD = -1,
 342        OBJ_NONE = 0,
 343        OBJ_COMMIT = 1,
 344        OBJ_TREE = 2,
 345        OBJ_BLOB = 3,
 346        OBJ_TAG = 4,
 347        /* 5 for future expansion */
 348        OBJ_OFS_DELTA = 6,
 349        OBJ_REF_DELTA = 7,
 350        OBJ_ANY,
 351        OBJ_MAX,
 352};
 353
 354static inline enum object_type object_type(unsigned int mode)
 355{
 356        return S_ISDIR(mode) ? OBJ_TREE :
 357                S_ISGITLINK(mode) ? OBJ_COMMIT :
 358                OBJ_BLOB;
 359}
 360
 361#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 362#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 363#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 364#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 365#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 366#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 367#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 368#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 369#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 370#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 371#define GITATTRIBUTES_FILE ".gitattributes"
 372#define INFOATTRIBUTES_FILE "info/attributes"
 373#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 374
 375extern int is_bare_repository_cfg;
 376extern int is_bare_repository(void);
 377extern int is_inside_git_dir(void);
 378extern char *git_work_tree_cfg;
 379extern int is_inside_work_tree(void);
 380extern int have_git_dir(void);
 381extern const char *get_git_dir(void);
 382extern char *get_object_directory(void);
 383extern char *get_index_file(void);
 384extern char *get_graft_file(void);
 385extern int set_git_dir(const char *path);
 386extern const char *get_git_work_tree(void);
 387extern const char *read_gitfile_gently(const char *path);
 388extern void set_git_work_tree(const char *tree);
 389
 390#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 391
 392extern const char **get_pathspec(const char *prefix, const char **pathspec);
 393extern void setup_work_tree(void);
 394extern const char *setup_git_directory_gently(int *);
 395extern const char *setup_git_directory(void);
 396extern const char *prefix_path(const char *prefix, int len, const char *path);
 397extern const char *prefix_filename(const char *prefix, int len, const char *path);
 398extern void verify_filename(const char *prefix, const char *name);
 399extern void verify_non_filename(const char *prefix, const char *name);
 400
 401#define INIT_DB_QUIET 0x0001
 402
 403extern int init_db(const char *template_dir, unsigned int flags);
 404
 405#define alloc_nr(x) (((x)+16)*3/2)
 406
 407/*
 408 * Realloc the buffer pointed at by variable 'x' so that it can hold
 409 * at least 'nr' entries; the number of entries currently allocated
 410 * is 'alloc', using the standard growing factor alloc_nr() macro.
 411 *
 412 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 413 */
 414#define ALLOC_GROW(x, nr, alloc) \
 415        do { \
 416                if ((nr) > alloc) { \
 417                        if (alloc_nr(alloc) < (nr)) \
 418                                alloc = (nr); \
 419                        else \
 420                                alloc = alloc_nr(alloc); \
 421                        x = xrealloc((x), alloc * sizeof(*(x))); \
 422                } \
 423        } while(0)
 424
 425/* Initialize and use the cache information */
 426extern int read_index(struct index_state *);
 427extern int read_index_preload(struct index_state *, const char **pathspec);
 428extern int read_index_from(struct index_state *, const char *path);
 429extern int is_index_unborn(struct index_state *);
 430extern int read_index_unmerged(struct index_state *);
 431extern int write_index(struct index_state *, int newfd);
 432extern int discard_index(struct index_state *);
 433extern int unmerged_index(const struct index_state *);
 434extern int verify_path(const char *path);
 435extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 436extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 437#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 438#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 439#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 440#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 441#define ADD_CACHE_NEW_ONLY 16           /* Do not replace existing ones */
 442extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 443extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 444extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 445extern int remove_index_entry_at(struct index_state *, int pos);
 446extern void remove_marked_cache_entries(struct index_state *istate);
 447extern int remove_file_from_index(struct index_state *, const char *path);
 448#define ADD_CACHE_VERBOSE 1
 449#define ADD_CACHE_PRETEND 2
 450#define ADD_CACHE_IGNORE_ERRORS 4
 451#define ADD_CACHE_IGNORE_REMOVAL 8
 452#define ADD_CACHE_INTENT 16
 453extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 454extern int add_file_to_index(struct index_state *, const char *path, int flags);
 455extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 456extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 457extern int index_name_is_other(const struct index_state *, const char *, int);
 458
 459/* do stat comparison even if CE_VALID is true */
 460#define CE_MATCH_IGNORE_VALID           01
 461/* do not check the contents but report dirty on racily-clean entries */
 462#define CE_MATCH_RACY_IS_DIRTY  02
 463extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 464extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 465
 466extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 467extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 468extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 469extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 470
 471#define REFRESH_REALLY          0x0001  /* ignore_valid */
 472#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 473#define REFRESH_QUIET           0x0004  /* be quiet about it */
 474#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 475#define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 476#define REFRESH_SAY_CHANGED     0x0020  /* say "changed" not "needs update" */
 477extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 478
 479struct lock_file {
 480        struct lock_file *next;
 481        int fd;
 482        pid_t owner;
 483        char on_list;
 484        char filename[PATH_MAX];
 485};
 486#define LOCK_DIE_ON_ERROR 1
 487#define LOCK_NODEREF 2
 488extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 489extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 490extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 491extern int commit_lock_file(struct lock_file *);
 492
 493extern int hold_locked_index(struct lock_file *, int);
 494extern int commit_locked_index(struct lock_file *);
 495extern void set_alternate_index_output(const char *);
 496extern int close_lock_file(struct lock_file *);
 497extern void rollback_lock_file(struct lock_file *);
 498extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 499
 500/* Environment bits from configuration mechanism */
 501extern int trust_executable_bit;
 502extern int trust_ctime;
 503extern int quote_path_fully;
 504extern int has_symlinks;
 505extern int ignore_case;
 506extern int assume_unchanged;
 507extern int prefer_symlink_refs;
 508extern int log_all_ref_updates;
 509extern int warn_ambiguous_refs;
 510extern int shared_repository;
 511extern const char *apply_default_whitespace;
 512extern int zlib_compression_level;
 513extern int core_compression_level;
 514extern int core_compression_seen;
 515extern size_t packed_git_window_size;
 516extern size_t packed_git_limit;
 517extern size_t delta_base_cache_limit;
 518extern int auto_crlf;
 519extern int fsync_object_files;
 520extern int core_preload_index;
 521
 522enum safe_crlf {
 523        SAFE_CRLF_FALSE = 0,
 524        SAFE_CRLF_FAIL = 1,
 525        SAFE_CRLF_WARN = 2,
 526};
 527
 528extern enum safe_crlf safe_crlf;
 529
 530enum branch_track {
 531        BRANCH_TRACK_UNSPECIFIED = -1,
 532        BRANCH_TRACK_NEVER = 0,
 533        BRANCH_TRACK_REMOTE,
 534        BRANCH_TRACK_ALWAYS,
 535        BRANCH_TRACK_EXPLICIT,
 536};
 537
 538enum rebase_setup_type {
 539        AUTOREBASE_NEVER = 0,
 540        AUTOREBASE_LOCAL,
 541        AUTOREBASE_REMOTE,
 542        AUTOREBASE_ALWAYS,
 543};
 544
 545enum push_default_type {
 546        PUSH_DEFAULT_NOTHING = 0,
 547        PUSH_DEFAULT_MATCHING,
 548        PUSH_DEFAULT_TRACKING,
 549        PUSH_DEFAULT_CURRENT,
 550};
 551
 552extern enum branch_track git_branch_track;
 553extern enum rebase_setup_type autorebase;
 554extern enum push_default_type push_default;
 555
 556enum object_creation_mode {
 557        OBJECT_CREATION_USES_HARDLINKS = 0,
 558        OBJECT_CREATION_USES_RENAMES = 1,
 559};
 560
 561extern enum object_creation_mode object_creation_mode;
 562
 563#define GIT_REPO_VERSION 0
 564extern int repository_format_version;
 565extern int check_repository_format(void);
 566
 567#define MTIME_CHANGED   0x0001
 568#define CTIME_CHANGED   0x0002
 569#define OWNER_CHANGED   0x0004
 570#define MODE_CHANGED    0x0008
 571#define INODE_CHANGED   0x0010
 572#define DATA_CHANGED    0x0020
 573#define TYPE_CHANGED    0x0040
 574
 575extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 576        __attribute__((format (printf, 3, 4)));
 577extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 578        __attribute__((format (printf, 3, 4)));
 579extern char *git_pathdup(const char *fmt, ...)
 580        __attribute__((format (printf, 1, 2)));
 581
 582/* Return a statically allocated filename matching the sha1 signature */
 583extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 584extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 585extern char *sha1_file_name(const unsigned char *sha1);
 586extern char *sha1_pack_name(const unsigned char *sha1);
 587extern char *sha1_pack_index_name(const unsigned char *sha1);
 588extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 589extern const unsigned char null_sha1[20];
 590static inline int is_null_sha1(const unsigned char *sha1)
 591{
 592        return !memcmp(sha1, null_sha1, 20);
 593}
 594static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 595{
 596        return memcmp(sha1, sha2, 20);
 597}
 598static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 599{
 600        memcpy(sha_dst, sha_src, 20);
 601}
 602static inline void hashclr(unsigned char *hash)
 603{
 604        memset(hash, 0, 20);
 605}
 606extern int is_empty_blob_sha1(const unsigned char *sha1);
 607
 608#define EMPTY_TREE_SHA1_HEX \
 609        "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 610#define EMPTY_TREE_SHA1_BIN \
 611         "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 612         "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 613
 614int git_mkstemp(char *path, size_t n, const char *template);
 615
 616int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 617
 618/*
 619 * NOTE NOTE NOTE!!
 620 *
 621 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 622 * not be changed. Old repositories have core.sharedrepository written in
 623 * numeric format, and therefore these values are preserved for compatibility
 624 * reasons.
 625 */
 626enum sharedrepo {
 627        PERM_UMASK          = 0,
 628        OLD_PERM_GROUP      = 1,
 629        OLD_PERM_EVERYBODY  = 2,
 630        PERM_GROUP          = 0660,
 631        PERM_EVERYBODY      = 0664,
 632};
 633int git_config_perm(const char *var, const char *value);
 634int set_shared_perm(const char *path, int mode);
 635#define adjust_shared_perm(path) set_shared_perm((path), 0)
 636int safe_create_leading_directories(char *path);
 637int safe_create_leading_directories_const(const char *path);
 638char *enter_repo(char *path, int strict);
 639static inline int is_absolute_path(const char *path)
 640{
 641        return path[0] == '/' || has_dos_drive_prefix(path);
 642}
 643int is_directory(const char *);
 644const char *make_absolute_path(const char *path);
 645const char *make_nonrelative_path(const char *path);
 646const char *make_relative_path(const char *abs, const char *base);
 647int normalize_path_copy(char *dst, const char *src);
 648int longest_ancestor_length(const char *path, const char *prefix_list);
 649char *strip_path_suffix(const char *path, const char *suffix);
 650
 651/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 652extern int sha1_object_info(const unsigned char *, unsigned long *);
 653extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 654extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 655extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 656extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 657extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 658
 659/* global flag to enable extra checks when accessing packed objects */
 660extern int do_check_packed_object_crc;
 661
 662extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 663
 664extern int move_temp_to_file(const char *tmpfile, const char *filename);
 665
 666extern int has_sha1_pack(const unsigned char *sha1);
 667extern int has_sha1_file(const unsigned char *sha1);
 668extern int has_loose_object_nonlocal(const unsigned char *sha1);
 669
 670extern int has_pack_file(const unsigned char *sha1);
 671extern int has_pack_index(const unsigned char *sha1);
 672
 673extern const signed char hexval_table[256];
 674static inline unsigned int hexval(unsigned char c)
 675{
 676        return hexval_table[c];
 677}
 678
 679/* Convert to/from hex/sha1 representation */
 680#define MINIMUM_ABBREV 4
 681#define DEFAULT_ABBREV 7
 682
 683extern int get_sha1(const char *str, unsigned char *sha1);
 684extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 685extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 686extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 687extern int read_ref(const char *filename, unsigned char *sha1);
 688extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 689extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 690extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 691extern int interpret_branch_name(const char *str, struct strbuf *);
 692
 693extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 694extern const char *ref_rev_parse_rules[];
 695extern const char *ref_fetch_rules[];
 696
 697extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 698extern int validate_headref(const char *ref);
 699
 700extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 701extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 702extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 703
 704extern void *read_object_with_reference(const unsigned char *sha1,
 705                                        const char *required_type,
 706                                        unsigned long *size,
 707                                        unsigned char *sha1_ret);
 708
 709extern struct object *peel_to_type(const char *name, int namelen,
 710                                   struct object *o, enum object_type);
 711
 712enum date_mode {
 713        DATE_NORMAL = 0,
 714        DATE_RELATIVE,
 715        DATE_SHORT,
 716        DATE_LOCAL,
 717        DATE_ISO8601,
 718        DATE_RFC2822,
 719        DATE_RAW
 720};
 721
 722const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 723int parse_date(const char *date, char *buf, int bufsize);
 724void datestamp(char *buf, int bufsize);
 725unsigned long approxidate(const char *);
 726enum date_mode parse_date_format(const char *format);
 727
 728#define IDENT_WARN_ON_NO_NAME  1
 729#define IDENT_ERROR_ON_NO_NAME 2
 730#define IDENT_NO_DATE          4
 731extern const char *git_author_info(int);
 732extern const char *git_committer_info(int);
 733extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 734extern const char *fmt_name(const char *name, const char *email);
 735
 736struct checkout {
 737        const char *base_dir;
 738        int base_dir_len;
 739        unsigned force:1,
 740                 quiet:1,
 741                 not_new:1,
 742                 refresh_cache:1;
 743};
 744
 745extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 746
 747struct cache_def {
 748        char path[PATH_MAX + 1];
 749        int len;
 750        int flags;
 751        int track_flags;
 752        int prefix_len_stat_func;
 753};
 754
 755extern int has_symlink_leading_path(const char *name, int len);
 756extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 757extern int has_symlink_or_noent_leading_path(const char *name, int len);
 758extern int has_dirs_only_path(const char *name, int len, int prefix_len);
 759extern void invalidate_lstat_cache(const char *name, int len);
 760extern void clear_lstat_cache(void);
 761extern void schedule_dir_for_removal(const char *name, int len);
 762extern void remove_scheduled_dirs(void);
 763
 764extern struct alternate_object_database {
 765        struct alternate_object_database *next;
 766        char *name;
 767        char base[FLEX_ARRAY]; /* more */
 768} *alt_odb_list;
 769extern void prepare_alt_odb(void);
 770extern void add_to_alternates_file(const char *reference);
 771typedef int alt_odb_fn(struct alternate_object_database *, void *);
 772extern void foreach_alt_odb(alt_odb_fn, void*);
 773
 774struct pack_window {
 775        struct pack_window *next;
 776        unsigned char *base;
 777        off_t offset;
 778        size_t len;
 779        unsigned int last_used;
 780        unsigned int inuse_cnt;
 781};
 782
 783extern struct packed_git {
 784        struct packed_git *next;
 785        struct pack_window *windows;
 786        off_t pack_size;
 787        const void *index_data;
 788        size_t index_size;
 789        uint32_t num_objects;
 790        uint32_t num_bad_objects;
 791        unsigned char *bad_object_sha1;
 792        int index_version;
 793        time_t mtime;
 794        int pack_fd;
 795        unsigned pack_local:1,
 796                 pack_keep:1;
 797        unsigned char sha1[20];
 798        /* something like ".git/objects/pack/xxxxx.pack" */
 799        char pack_name[FLEX_ARRAY]; /* more */
 800} *packed_git;
 801
 802struct pack_entry {
 803        off_t offset;
 804        unsigned char sha1[20];
 805        struct packed_git *p;
 806};
 807
 808struct ref {
 809        struct ref *next;
 810        unsigned char old_sha1[20];
 811        unsigned char new_sha1[20];
 812        char *symref;
 813        unsigned int force:1,
 814                merge:1,
 815                nonfastforward:1,
 816                deletion:1;
 817        enum {
 818                REF_STATUS_NONE = 0,
 819                REF_STATUS_OK,
 820                REF_STATUS_REJECT_NONFASTFORWARD,
 821                REF_STATUS_REJECT_NODELETE,
 822                REF_STATUS_UPTODATE,
 823                REF_STATUS_REMOTE_REJECT,
 824                REF_STATUS_EXPECTING_REPORT,
 825        } status;
 826        char *remote_status;
 827        struct ref *peer_ref; /* when renaming */
 828        char name[FLEX_ARRAY]; /* more */
 829};
 830
 831#define REF_NORMAL      (1u << 0)
 832#define REF_HEADS       (1u << 1)
 833#define REF_TAGS        (1u << 2)
 834
 835extern struct ref *find_ref_by_name(const struct ref *list, const char *name);
 836
 837#define CONNECT_VERBOSE       (1u << 0)
 838extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 839extern int finish_connect(struct child_process *conn);
 840extern int path_match(const char *path, int nr, char **match);
 841extern int get_ack(int fd, unsigned char *result_sha1);
 842struct extra_have_objects {
 843        int nr, alloc;
 844        unsigned char (*array)[20];
 845};
 846extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags, struct extra_have_objects *);
 847extern int server_supports(const char *feature);
 848
 849extern struct packed_git *parse_pack_index(unsigned char *sha1);
 850
 851extern void prepare_packed_git(void);
 852extern void reprepare_packed_git(void);
 853extern void install_packed_git(struct packed_git *pack);
 854
 855extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 856                                         struct packed_git *packs);
 857
 858extern void pack_report(void);
 859extern int open_pack_index(struct packed_git *);
 860extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 861extern void close_pack_windows(struct packed_git *);
 862extern void unuse_pack(struct pack_window **);
 863extern void free_pack_by_name(const char *);
 864extern void clear_delta_base_cache(void);
 865extern struct packed_git *add_packed_git(const char *, int, int);
 866extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 867extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
 868extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 869extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 870extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 871extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 872extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 873
 874/* Dumb servers support */
 875extern int update_server_info(int);
 876
 877typedef int (*config_fn_t)(const char *, const char *, void *);
 878extern int git_default_config(const char *, const char *, void *);
 879extern int git_config_from_file(config_fn_t fn, const char *, void *);
 880extern int git_config(config_fn_t fn, void *);
 881extern int git_parse_ulong(const char *, unsigned long *);
 882extern int git_config_int(const char *, const char *);
 883extern unsigned long git_config_ulong(const char *, const char *);
 884extern int git_config_bool_or_int(const char *, const char *, int *);
 885extern int git_config_bool(const char *, const char *);
 886extern int git_config_string(const char **, const char *, const char *);
 887extern int git_config_set(const char *, const char *);
 888extern int git_config_set_multivar(const char *, const char *, const char *, int);
 889extern int git_config_rename_section(const char *, const char *);
 890extern const char *git_etc_gitconfig(void);
 891extern int check_repository_format_version(const char *var, const char *value, void *cb);
 892extern int git_config_system(void);
 893extern int git_config_global(void);
 894extern int config_error_nonbool(const char *);
 895extern const char *config_exclusive_filename;
 896
 897#define MAX_GITNAME (1000)
 898extern char git_default_email[MAX_GITNAME];
 899extern char git_default_name[MAX_GITNAME];
 900extern int user_ident_explicitly_given;
 901
 902extern const char *git_commit_encoding;
 903extern const char *git_log_output_encoding;
 904extern const char *git_mailmap_file;
 905
 906/* IO helper functions */
 907extern void maybe_flush_or_die(FILE *, const char *);
 908extern int copy_fd(int ifd, int ofd);
 909extern int copy_file(const char *dst, const char *src, int mode);
 910extern ssize_t read_in_full(int fd, void *buf, size_t count);
 911extern ssize_t write_in_full(int fd, const void *buf, size_t count);
 912extern void write_or_die(int fd, const void *buf, size_t count);
 913extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 914extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 915extern void fsync_or_die(int fd, const char *);
 916
 917/* pager.c */
 918extern void setup_pager(void);
 919extern const char *pager_program;
 920extern int pager_in_use(void);
 921extern int pager_use_color;
 922
 923extern const char *editor_program;
 924extern const char *excludes_file;
 925
 926/* base85 */
 927int decode_85(char *dst, const char *line, int linelen);
 928void encode_85(char *buf, const unsigned char *data, int bytes);
 929
 930/* alloc.c */
 931extern void *alloc_blob_node(void);
 932extern void *alloc_tree_node(void);
 933extern void *alloc_commit_node(void);
 934extern void *alloc_tag_node(void);
 935extern void *alloc_object_node(void);
 936extern void alloc_report(void);
 937
 938/* trace.c */
 939extern void trace_printf(const char *format, ...);
 940extern void trace_argv_printf(const char **argv, const char *format, ...);
 941
 942/* convert.c */
 943/* returns 1 if *dst was used */
 944extern int convert_to_git(const char *path, const char *src, size_t len,
 945                          struct strbuf *dst, enum safe_crlf checksafe);
 946extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 947
 948/* add */
 949/*
 950 * return 0 if success, 1 - if addition of a file failed and
 951 * ADD_FILES_IGNORE_ERRORS was specified in flags
 952 */
 953int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
 954
 955/* diff.c */
 956extern int diff_auto_refresh_index;
 957
 958/* match-trees.c */
 959void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 960
 961/*
 962 * whitespace rules.
 963 * used by both diff and apply
 964 */
 965#define WS_TRAILING_SPACE       01
 966#define WS_SPACE_BEFORE_TAB     02
 967#define WS_INDENT_WITH_NON_TAB  04
 968#define WS_CR_AT_EOL           010
 969#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 970extern unsigned whitespace_rule_cfg;
 971extern unsigned whitespace_rule(const char *);
 972extern unsigned parse_whitespace_rule(const char *);
 973extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
 974extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
 975extern char *whitespace_error_string(unsigned ws);
 976extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
 977extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
 978
 979/* ls-files */
 980int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 981void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 982
 983char *alias_lookup(const char *alias);
 984int split_cmdline(char *cmdline, const char ***argv);
 985
 986#endif /* CACHE_H */