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#include "advice.h"
   8
   9#include SHA1_HEADER
  10#ifndef git_SHA_CTX
  11#define git_SHA_CTX     SHA_CTX
  12#define git_SHA1_Init   SHA1_Init
  13#define git_SHA1_Update SHA1_Update
  14#define git_SHA1_Final  SHA1_Final
  15#endif
  16
  17#include <zlib.h>
  18#if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  19#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  20#endif
  21
  22void git_inflate_init(z_streamp strm);
  23void git_inflate_end(z_streamp strm);
  24int git_inflate(z_streamp strm, int flush);
  25
  26#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  27#define DTYPE(de)       ((de)->d_type)
  28#else
  29#undef DT_UNKNOWN
  30#undef DT_DIR
  31#undef DT_REG
  32#undef DT_LNK
  33#define DT_UNKNOWN      0
  34#define DT_DIR          1
  35#define DT_REG          2
  36#define DT_LNK          3
  37#define DTYPE(de)       DT_UNKNOWN
  38#endif
  39
  40/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  41#define S_IFINVALID     0030000
  42
  43/*
  44 * A "directory link" is a link to another git directory.
  45 *
  46 * The value 0160000 is not normally a valid mode, and
  47 * also just happens to be S_IFDIR + S_IFLNK
  48 *
  49 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  50 * always having the same values everywhere. We should use
  51 * our internal git values for these things, and then we can
  52 * translate that to the OS-specific value. It just so
  53 * happens that everybody shares the same bit representation
  54 * in the UNIX world (and apparently wider too..)
  55 */
  56#define S_IFGITLINK     0160000
  57#define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  58
  59/*
  60 * Intensive research over the course of many years has shown that
  61 * port 9418 is totally unused by anything else. Or
  62 *
  63 *      Your search - "port 9418" - did not match any documents.
  64 *
  65 * as www.google.com puts it.
  66 *
  67 * This port has been properly assigned for git use by IANA:
  68 * git (Assigned-9418) [I06-050728-0001].
  69 *
  70 *      git  9418/tcp   git pack transfer service
  71 *      git  9418/udp   git pack transfer service
  72 *
  73 * with Linus Torvalds <torvalds@osdl.org> as the point of
  74 * contact. September 2005.
  75 *
  76 * See http://www.iana.org/assignments/port-numbers
  77 */
  78#define DEFAULT_GIT_PORT 9418
  79
  80/*
  81 * Basic data structures for the directory cache
  82 */
  83
  84#define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  85struct cache_header {
  86        unsigned int hdr_signature;
  87        unsigned int hdr_version;
  88        unsigned int hdr_entries;
  89};
  90
  91/*
  92 * The "cache_time" is just the low 32 bits of the
  93 * time. It doesn't matter if it overflows - we only
  94 * check it for equality in the 32 bits we save.
  95 */
  96struct cache_time {
  97        unsigned int sec;
  98        unsigned int nsec;
  99};
 100
 101/*
 102 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
 103 * Again - this is just a (very strong in practice) heuristic that
 104 * the inode hasn't changed.
 105 *
 106 * We save the fields in big-endian order to allow using the
 107 * index file over NFS transparently.
 108 */
 109struct ondisk_cache_entry {
 110        struct cache_time ctime;
 111        struct cache_time mtime;
 112        unsigned int dev;
 113        unsigned int ino;
 114        unsigned int mode;
 115        unsigned int uid;
 116        unsigned int gid;
 117        unsigned int size;
 118        unsigned char sha1[20];
 119        unsigned short flags;
 120        char name[FLEX_ARRAY]; /* more */
 121};
 122
 123/*
 124 * This struct is used when CE_EXTENDED bit is 1
 125 * The struct must match ondisk_cache_entry exactly from
 126 * ctime till flags
 127 */
 128struct ondisk_cache_entry_extended {
 129        struct cache_time ctime;
 130        struct cache_time mtime;
 131        unsigned int dev;
 132        unsigned int ino;
 133        unsigned int mode;
 134        unsigned int uid;
 135        unsigned int gid;
 136        unsigned int size;
 137        unsigned char sha1[20];
 138        unsigned short flags;
 139        unsigned short flags2;
 140        char name[FLEX_ARRAY]; /* more */
 141};
 142
 143struct cache_entry {
 144        struct cache_time ce_ctime;
 145        struct cache_time ce_mtime;
 146        unsigned int ce_dev;
 147        unsigned int ce_ino;
 148        unsigned int ce_mode;
 149        unsigned int ce_uid;
 150        unsigned int ce_gid;
 151        unsigned int ce_size;
 152        unsigned int ce_flags;
 153        unsigned char sha1[20];
 154        struct cache_entry *next;
 155        char name[FLEX_ARRAY]; /* more */
 156};
 157
 158#define CE_NAMEMASK  (0x0fff)
 159#define CE_STAGEMASK (0x3000)
 160#define CE_EXTENDED  (0x4000)
 161#define CE_VALID     (0x8000)
 162#define CE_STAGESHIFT 12
 163
 164/*
 165 * Range 0xFFFF0000 in ce_flags is divided into
 166 * two parts: in-memory flags and on-disk ones.
 167 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
 168 * if you want to save a new flag, add it in
 169 * CE_EXTENDED_FLAGS
 170 *
 171 * In-memory only flags
 172 */
 173#define CE_UPDATE    (0x10000)
 174#define CE_REMOVE    (0x20000)
 175#define CE_UPTODATE  (0x40000)
 176#define CE_ADDED     (0x80000)
 177
 178#define CE_HASHED    (0x100000)
 179#define CE_UNHASHED  (0x200000)
 180#define CE_CONFLICTED (0x800000)
 181
 182/* Only remove in work directory, not index */
 183#define CE_WT_REMOVE (0x400000)
 184
 185#define CE_UNPACKED  (0x1000000)
 186
 187/*
 188 * Extended on-disk flags
 189 */
 190#define CE_INTENT_TO_ADD 0x20000000
 191#define CE_SKIP_WORKTREE 0x40000000
 192/* CE_EXTENDED2 is for future extension */
 193#define CE_EXTENDED2 0x80000000
 194
 195#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
 196
 197/*
 198 * Safeguard to avoid saving wrong flags:
 199 *  - CE_EXTENDED2 won't get saved until its semantic is known
 200 *  - Bits in 0x0000FFFF have been saved in ce_flags already
 201 *  - Bits in 0x003F0000 are currently in-memory flags
 202 */
 203#if CE_EXTENDED_FLAGS & 0x803FFFFF
 204#error "CE_EXTENDED_FLAGS out of range"
 205#endif
 206
 207/*
 208 * Copy the sha1 and stat state of a cache entry from one to
 209 * another. But we never change the name, or the hash state!
 210 */
 211#define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 212static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 213{
 214        unsigned int state = dst->ce_flags & CE_STATE_MASK;
 215
 216        /* Don't copy hash chain and name */
 217        memcpy(dst, src, offsetof(struct cache_entry, next));
 218
 219        /* Restore the hash state */
 220        dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 221}
 222
 223static inline unsigned create_ce_flags(size_t len, unsigned stage)
 224{
 225        if (len >= CE_NAMEMASK)
 226                len = CE_NAMEMASK;
 227        return (len | (stage << CE_STAGESHIFT));
 228}
 229
 230static inline size_t ce_namelen(const struct cache_entry *ce)
 231{
 232        size_t len = ce->ce_flags & CE_NAMEMASK;
 233        if (len < CE_NAMEMASK)
 234                return len;
 235        return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 236}
 237
 238#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 239#define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \
 240                            ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
 241                            ondisk_cache_entry_size(ce_namelen(ce)))
 242#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 243#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 244#define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
 245#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 246
 247#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 248static inline unsigned int create_ce_mode(unsigned int mode)
 249{
 250        if (S_ISLNK(mode))
 251                return S_IFLNK;
 252        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 253                return S_IFGITLINK;
 254        return S_IFREG | ce_permissions(mode);
 255}
 256static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 257{
 258        extern int trust_executable_bit, has_symlinks;
 259        if (!has_symlinks && S_ISREG(mode) &&
 260            ce && S_ISLNK(ce->ce_mode))
 261                return ce->ce_mode;
 262        if (!trust_executable_bit && S_ISREG(mode)) {
 263                if (ce && S_ISREG(ce->ce_mode))
 264                        return ce->ce_mode;
 265                return create_ce_mode(0666);
 266        }
 267        return create_ce_mode(mode);
 268}
 269static inline int ce_to_dtype(const struct cache_entry *ce)
 270{
 271        unsigned ce_mode = ntohl(ce->ce_mode);
 272        if (S_ISREG(ce_mode))
 273                return DT_REG;
 274        else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 275                return DT_DIR;
 276        else if (S_ISLNK(ce_mode))
 277                return DT_LNK;
 278        else
 279                return DT_UNKNOWN;
 280}
 281#define canon_mode(mode) \
 282        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 283        S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 284
 285#define flexible_size(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
 286#define cache_entry_size(len) flexible_size(cache_entry,len)
 287#define ondisk_cache_entry_size(len) flexible_size(ondisk_cache_entry,len)
 288#define ondisk_cache_entry_extended_size(len) flexible_size(ondisk_cache_entry_extended,len)
 289
 290struct index_state {
 291        struct cache_entry **cache;
 292        unsigned int cache_nr, cache_alloc, cache_changed;
 293        struct string_list *resolve_undo;
 294        struct cache_tree *cache_tree;
 295        struct cache_time timestamp;
 296        void *alloc;
 297        unsigned name_hash_initialized : 1,
 298                 initialized : 1;
 299        struct hash_table name_hash;
 300};
 301
 302extern struct index_state the_index;
 303
 304/* Name hashing */
 305extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 306/*
 307 * We don't actually *remove* it, we can just mark it invalid so that
 308 * we won't find it in lookups.
 309 *
 310 * Not only would we have to search the lists (simple enough), but
 311 * we'd also have to rehash other hash buckets in case this makes the
 312 * hash bucket empty (common). So it's much better to just mark
 313 * it.
 314 */
 315static inline void remove_name_hash(struct cache_entry *ce)
 316{
 317        ce->ce_flags |= CE_UNHASHED;
 318}
 319
 320
 321#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 322#define active_cache (the_index.cache)
 323#define active_nr (the_index.cache_nr)
 324#define active_alloc (the_index.cache_alloc)
 325#define active_cache_changed (the_index.cache_changed)
 326#define active_cache_tree (the_index.cache_tree)
 327
 328#define read_cache() read_index(&the_index)
 329#define read_cache_from(path) read_index_from(&the_index, (path))
 330#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 331#define is_cache_unborn() is_index_unborn(&the_index)
 332#define read_cache_unmerged() read_index_unmerged(&the_index)
 333#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 334#define discard_cache() discard_index(&the_index)
 335#define unmerged_cache() unmerged_index(&the_index)
 336#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 337#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 338#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 339#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 340#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 341#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 342#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 343#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
 344#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 345#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 346#define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 347#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 348#define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 349#define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
 350#define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
 351#endif
 352
 353enum object_type {
 354        OBJ_BAD = -1,
 355        OBJ_NONE = 0,
 356        OBJ_COMMIT = 1,
 357        OBJ_TREE = 2,
 358        OBJ_BLOB = 3,
 359        OBJ_TAG = 4,
 360        /* 5 for future expansion */
 361        OBJ_OFS_DELTA = 6,
 362        OBJ_REF_DELTA = 7,
 363        OBJ_ANY,
 364        OBJ_MAX,
 365};
 366
 367static inline enum object_type object_type(unsigned int mode)
 368{
 369        return S_ISDIR(mode) ? OBJ_TREE :
 370                S_ISGITLINK(mode) ? OBJ_COMMIT :
 371                OBJ_BLOB;
 372}
 373
 374#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 375#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 376#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 377#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 378#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 379#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 380#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 381#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 382#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 383#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 384#define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
 385#define GITATTRIBUTES_FILE ".gitattributes"
 386#define INFOATTRIBUTES_FILE "info/attributes"
 387#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 388#define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 389#define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 390
 391/*
 392 * Repository-local GIT_* environment variables
 393 * The array is NULL-terminated to simplify its usage in contexts such
 394 * environment creation or simple walk of the list.
 395 * The number of non-NULL entries is available as a macro.
 396 */
 397#define LOCAL_REPO_ENV_SIZE 8
 398extern const char *const local_repo_env[LOCAL_REPO_ENV_SIZE + 1];
 399
 400extern int is_bare_repository_cfg;
 401extern int is_bare_repository(void);
 402extern int is_inside_git_dir(void);
 403extern char *git_work_tree_cfg;
 404extern int is_inside_work_tree(void);
 405extern int have_git_dir(void);
 406extern const char *get_git_dir(void);
 407extern char *get_object_directory(void);
 408extern char *get_index_file(void);
 409extern char *get_graft_file(void);
 410extern int set_git_dir(const char *path);
 411extern const char *get_git_work_tree(void);
 412extern const char *read_gitfile_gently(const char *path);
 413extern void set_git_work_tree(const char *tree);
 414
 415#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 416
 417extern const char **get_pathspec(const char *prefix, const char **pathspec);
 418extern void setup_work_tree(void);
 419extern const char *setup_git_directory_gently(int *);
 420extern const char *setup_git_directory(void);
 421extern const char *prefix_path(const char *prefix, int len, const char *path);
 422extern const char *prefix_filename(const char *prefix, int len, const char *path);
 423extern int check_filename(const char *prefix, const char *name);
 424extern void verify_filename(const char *prefix, const char *name);
 425extern void verify_non_filename(const char *prefix, const char *name);
 426
 427#define INIT_DB_QUIET 0x0001
 428
 429extern int init_db(const char *template_dir, unsigned int flags);
 430
 431#define alloc_nr(x) (((x)+16)*3/2)
 432
 433/*
 434 * Realloc the buffer pointed at by variable 'x' so that it can hold
 435 * at least 'nr' entries; the number of entries currently allocated
 436 * is 'alloc', using the standard growing factor alloc_nr() macro.
 437 *
 438 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 439 */
 440#define ALLOC_GROW(x, nr, alloc) \
 441        do { \
 442                if ((nr) > alloc) { \
 443                        if (alloc_nr(alloc) < (nr)) \
 444                                alloc = (nr); \
 445                        else \
 446                                alloc = alloc_nr(alloc); \
 447                        x = xrealloc((x), alloc * sizeof(*(x))); \
 448                } \
 449        } while(0)
 450
 451/* Initialize and use the cache information */
 452extern int read_index(struct index_state *);
 453extern int read_index_preload(struct index_state *, const char **pathspec);
 454extern int read_index_from(struct index_state *, const char *path);
 455extern int is_index_unborn(struct index_state *);
 456extern int read_index_unmerged(struct index_state *);
 457extern int write_index(struct index_state *, int newfd);
 458extern int discard_index(struct index_state *);
 459extern int unmerged_index(const struct index_state *);
 460extern int verify_path(const char *path);
 461extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 462extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 463#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 464#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 465#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 466#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 467#define ADD_CACHE_NEW_ONLY 16           /* Do not replace existing ones */
 468extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 469extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 470extern int remove_index_entry_at(struct index_state *, int pos);
 471extern void remove_marked_cache_entries(struct index_state *istate);
 472extern int remove_file_from_index(struct index_state *, const char *path);
 473#define ADD_CACHE_VERBOSE 1
 474#define ADD_CACHE_PRETEND 2
 475#define ADD_CACHE_IGNORE_ERRORS 4
 476#define ADD_CACHE_IGNORE_REMOVAL 8
 477#define ADD_CACHE_INTENT 16
 478extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 479extern int add_file_to_index(struct index_state *, const char *path, int flags);
 480extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 481extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 482extern int index_name_is_other(const struct index_state *, const char *, int);
 483
 484/* do stat comparison even if CE_VALID is true */
 485#define CE_MATCH_IGNORE_VALID           01
 486/* do not check the contents but report dirty on racily-clean entries */
 487#define CE_MATCH_RACY_IS_DIRTY          02
 488/* do stat comparison even if CE_SKIP_WORKTREE is true */
 489#define CE_MATCH_IGNORE_SKIP_WORKTREE   04
 490extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 491extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 492
 493extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 494extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 495extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 496extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 497
 498#define REFRESH_REALLY          0x0001  /* ignore_valid */
 499#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 500#define REFRESH_QUIET           0x0004  /* be quiet about it */
 501#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 502#define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 503#define REFRESH_IN_PORCELAIN    0x0020  /* user friendly output, not "needs update" */
 504extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen, char *header_msg);
 505
 506struct lock_file {
 507        struct lock_file *next;
 508        int fd;
 509        pid_t owner;
 510        char on_list;
 511        char filename[PATH_MAX];
 512};
 513#define LOCK_DIE_ON_ERROR 1
 514#define LOCK_NODEREF 2
 515extern int unable_to_lock_error(const char *path, int err);
 516extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 517extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 518extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 519extern int commit_lock_file(struct lock_file *);
 520
 521extern int hold_locked_index(struct lock_file *, int);
 522extern int commit_locked_index(struct lock_file *);
 523extern void set_alternate_index_output(const char *);
 524extern int close_lock_file(struct lock_file *);
 525extern void rollback_lock_file(struct lock_file *);
 526extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 527
 528/* Environment bits from configuration mechanism */
 529extern int trust_executable_bit;
 530extern int trust_ctime;
 531extern int quote_path_fully;
 532extern int has_symlinks;
 533extern int ignore_case;
 534extern int assume_unchanged;
 535extern int prefer_symlink_refs;
 536extern int log_all_ref_updates;
 537extern int warn_ambiguous_refs;
 538extern int shared_repository;
 539extern const char *apply_default_whitespace;
 540extern const char *apply_default_ignorewhitespace;
 541extern int zlib_compression_level;
 542extern int core_compression_level;
 543extern int core_compression_seen;
 544extern size_t packed_git_window_size;
 545extern size_t packed_git_limit;
 546extern size_t delta_base_cache_limit;
 547extern int auto_crlf;
 548extern int read_replace_refs;
 549extern int fsync_object_files;
 550extern int core_preload_index;
 551extern int core_apply_sparse_checkout;
 552
 553enum safe_crlf {
 554        SAFE_CRLF_FALSE = 0,
 555        SAFE_CRLF_FAIL = 1,
 556        SAFE_CRLF_WARN = 2,
 557};
 558
 559extern enum safe_crlf safe_crlf;
 560
 561enum branch_track {
 562        BRANCH_TRACK_UNSPECIFIED = -1,
 563        BRANCH_TRACK_NEVER = 0,
 564        BRANCH_TRACK_REMOTE,
 565        BRANCH_TRACK_ALWAYS,
 566        BRANCH_TRACK_EXPLICIT,
 567        BRANCH_TRACK_OVERRIDE,
 568};
 569
 570enum rebase_setup_type {
 571        AUTOREBASE_NEVER = 0,
 572        AUTOREBASE_LOCAL,
 573        AUTOREBASE_REMOTE,
 574        AUTOREBASE_ALWAYS,
 575};
 576
 577enum push_default_type {
 578        PUSH_DEFAULT_NOTHING = 0,
 579        PUSH_DEFAULT_MATCHING,
 580        PUSH_DEFAULT_TRACKING,
 581        PUSH_DEFAULT_CURRENT,
 582};
 583
 584extern enum branch_track git_branch_track;
 585extern enum rebase_setup_type autorebase;
 586extern enum push_default_type push_default;
 587
 588enum object_creation_mode {
 589        OBJECT_CREATION_USES_HARDLINKS = 0,
 590        OBJECT_CREATION_USES_RENAMES = 1,
 591};
 592
 593extern enum object_creation_mode object_creation_mode;
 594
 595extern char *notes_ref_name;
 596
 597extern int grafts_replace_parents;
 598
 599#define GIT_REPO_VERSION 0
 600extern int repository_format_version;
 601extern int check_repository_format(void);
 602
 603#define MTIME_CHANGED   0x0001
 604#define CTIME_CHANGED   0x0002
 605#define OWNER_CHANGED   0x0004
 606#define MODE_CHANGED    0x0008
 607#define INODE_CHANGED   0x0010
 608#define DATA_CHANGED    0x0020
 609#define TYPE_CHANGED    0x0040
 610
 611extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 612        __attribute__((format (printf, 3, 4)));
 613extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 614        __attribute__((format (printf, 3, 4)));
 615extern char *git_pathdup(const char *fmt, ...)
 616        __attribute__((format (printf, 1, 2)));
 617
 618/* Return a statically allocated filename matching the sha1 signature */
 619extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 620extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 621extern char *sha1_file_name(const unsigned char *sha1);
 622extern char *sha1_pack_name(const unsigned char *sha1);
 623extern char *sha1_pack_index_name(const unsigned char *sha1);
 624extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 625extern const unsigned char null_sha1[20];
 626static inline int is_null_sha1(const unsigned char *sha1)
 627{
 628        return !memcmp(sha1, null_sha1, 20);
 629}
 630static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 631{
 632        return memcmp(sha1, sha2, 20);
 633}
 634static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 635{
 636        memcpy(sha_dst, sha_src, 20);
 637}
 638static inline void hashclr(unsigned char *hash)
 639{
 640        memset(hash, 0, 20);
 641}
 642
 643#define EMPTY_TREE_SHA1_HEX \
 644        "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 645#define EMPTY_TREE_SHA1_BIN \
 646         "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 647         "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 648
 649int git_mkstemp(char *path, size_t n, const char *template);
 650
 651int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 652
 653/* set default permissions by passing mode arguments to open(2) */
 654int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
 655int git_mkstemp_mode(char *pattern, int mode);
 656
 657/*
 658 * NOTE NOTE NOTE!!
 659 *
 660 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 661 * not be changed. Old repositories have core.sharedrepository written in
 662 * numeric format, and therefore these values are preserved for compatibility
 663 * reasons.
 664 */
 665enum sharedrepo {
 666        PERM_UMASK          = 0,
 667        OLD_PERM_GROUP      = 1,
 668        OLD_PERM_EVERYBODY  = 2,
 669        PERM_GROUP          = 0660,
 670        PERM_EVERYBODY      = 0664,
 671};
 672int git_config_perm(const char *var, const char *value);
 673int set_shared_perm(const char *path, int mode);
 674#define adjust_shared_perm(path) set_shared_perm((path), 0)
 675int safe_create_leading_directories(char *path);
 676int safe_create_leading_directories_const(const char *path);
 677extern char *expand_user_path(const char *path);
 678char *enter_repo(char *path, int strict);
 679static inline int is_absolute_path(const char *path)
 680{
 681        return path[0] == '/' || has_dos_drive_prefix(path);
 682}
 683int is_directory(const char *);
 684const char *make_absolute_path(const char *path);
 685const char *make_nonrelative_path(const char *path);
 686const char *make_relative_path(const char *abs, const char *base);
 687int normalize_path_copy(char *dst, const char *src);
 688int longest_ancestor_length(const char *path, const char *prefix_list);
 689char *strip_path_suffix(const char *path, const char *suffix);
 690int daemon_avoid_alias(const char *path);
 691int offset_1st_component(const char *path);
 692
 693/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 694extern int sha1_object_info(const unsigned char *, unsigned long *);
 695extern void *read_sha1_file_repl(const unsigned char *sha1, enum object_type *type, unsigned long *size, const unsigned char **replacement);
 696static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 697{
 698        return read_sha1_file_repl(sha1, type, size, NULL);
 699}
 700extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 701extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 702extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 703extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 704
 705/* global flag to enable extra checks when accessing packed objects */
 706extern int do_check_packed_object_crc;
 707
 708extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 709
 710extern int move_temp_to_file(const char *tmpfile, const char *filename);
 711
 712extern int has_sha1_pack(const unsigned char *sha1);
 713extern int has_sha1_file(const unsigned char *sha1);
 714extern int has_loose_object_nonlocal(const unsigned char *sha1);
 715
 716extern int has_pack_index(const unsigned char *sha1);
 717
 718extern const signed char hexval_table[256];
 719static inline unsigned int hexval(unsigned char c)
 720{
 721        return hexval_table[c];
 722}
 723
 724/* Convert to/from hex/sha1 representation */
 725#define MINIMUM_ABBREV 4
 726#define DEFAULT_ABBREV 7
 727
 728extern int get_sha1(const char *str, unsigned char *sha1);
 729extern int get_sha1_with_mode_1(const char *str, unsigned char *sha1, unsigned *mode, int gently, const char *prefix);
 730static inline int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode)
 731{
 732        return get_sha1_with_mode_1(str, sha1, mode, 1, NULL);
 733}
 734extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 735extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 736extern int read_ref(const char *filename, unsigned char *sha1);
 737extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 738extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 739extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 740extern int interpret_branch_name(const char *str, struct strbuf *);
 741extern int get_sha1_mb(const char *str, unsigned char *sha1);
 742
 743extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 744extern const char *ref_rev_parse_rules[];
 745extern const char *ref_fetch_rules[];
 746
 747extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 748extern int validate_headref(const char *ref);
 749
 750extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 751extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 752extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 753
 754extern void *read_object_with_reference(const unsigned char *sha1,
 755                                        const char *required_type,
 756                                        unsigned long *size,
 757                                        unsigned char *sha1_ret);
 758
 759extern struct object *peel_to_type(const char *name, int namelen,
 760                                   struct object *o, enum object_type);
 761
 762enum date_mode {
 763        DATE_NORMAL = 0,
 764        DATE_RELATIVE,
 765        DATE_SHORT,
 766        DATE_LOCAL,
 767        DATE_ISO8601,
 768        DATE_RFC2822,
 769        DATE_RAW
 770};
 771
 772const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 773const char *show_date_relative(unsigned long time, int tz,
 774                               const struct timeval *now,
 775                               char *timebuf,
 776                               size_t timebuf_size);
 777int parse_date(const char *date, char *buf, int bufsize);
 778void datestamp(char *buf, int bufsize);
 779#define approxidate(s) approxidate_careful((s), NULL)
 780unsigned long approxidate_careful(const char *, int *);
 781unsigned long approxidate_relative(const char *date, const struct timeval *now);
 782enum date_mode parse_date_format(const char *format);
 783
 784#define IDENT_WARN_ON_NO_NAME  1
 785#define IDENT_ERROR_ON_NO_NAME 2
 786#define IDENT_NO_DATE          4
 787extern const char *git_author_info(int);
 788extern const char *git_committer_info(int);
 789extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 790extern const char *fmt_name(const char *name, const char *email);
 791extern const char *git_editor(void);
 792extern const char *git_pager(int stdout_is_tty);
 793
 794struct checkout {
 795        const char *base_dir;
 796        int base_dir_len;
 797        unsigned force:1,
 798                 quiet:1,
 799                 not_new:1,
 800                 refresh_cache:1;
 801};
 802
 803extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 804
 805struct cache_def {
 806        char path[PATH_MAX + 1];
 807        int len;
 808        int flags;
 809        int track_flags;
 810        int prefix_len_stat_func;
 811};
 812
 813extern int has_symlink_leading_path(const char *name, int len);
 814extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 815extern int has_symlink_or_noent_leading_path(const char *name, int len);
 816extern int has_dirs_only_path(const char *name, int len, int prefix_len);
 817extern void schedule_dir_for_removal(const char *name, int len);
 818extern void remove_scheduled_dirs(void);
 819
 820extern struct alternate_object_database {
 821        struct alternate_object_database *next;
 822        char *name;
 823        char base[FLEX_ARRAY]; /* more */
 824} *alt_odb_list;
 825extern void prepare_alt_odb(void);
 826extern void add_to_alternates_file(const char *reference);
 827typedef int alt_odb_fn(struct alternate_object_database *, void *);
 828extern void foreach_alt_odb(alt_odb_fn, void*);
 829
 830struct pack_window {
 831        struct pack_window *next;
 832        unsigned char *base;
 833        off_t offset;
 834        size_t len;
 835        unsigned int last_used;
 836        unsigned int inuse_cnt;
 837};
 838
 839extern struct packed_git {
 840        struct packed_git *next;
 841        struct pack_window *windows;
 842        off_t pack_size;
 843        const void *index_data;
 844        size_t index_size;
 845        uint32_t num_objects;
 846        uint32_t num_bad_objects;
 847        unsigned char *bad_object_sha1;
 848        int index_version;
 849        time_t mtime;
 850        int pack_fd;
 851        unsigned pack_local:1,
 852                 pack_keep:1;
 853        unsigned char sha1[20];
 854        /* something like ".git/objects/pack/xxxxx.pack" */
 855        char pack_name[FLEX_ARRAY]; /* more */
 856} *packed_git;
 857
 858struct pack_entry {
 859        off_t offset;
 860        unsigned char sha1[20];
 861        struct packed_git *p;
 862};
 863
 864struct ref {
 865        struct ref *next;
 866        unsigned char old_sha1[20];
 867        unsigned char new_sha1[20];
 868        char *symref;
 869        unsigned int force:1,
 870                merge:1,
 871                nonfastforward:1,
 872                deletion:1;
 873        enum {
 874                REF_STATUS_NONE = 0,
 875                REF_STATUS_OK,
 876                REF_STATUS_REJECT_NONFASTFORWARD,
 877                REF_STATUS_REJECT_NODELETE,
 878                REF_STATUS_UPTODATE,
 879                REF_STATUS_REMOTE_REJECT,
 880                REF_STATUS_EXPECTING_REPORT,
 881        } status;
 882        char *remote_status;
 883        struct ref *peer_ref; /* when renaming */
 884        char name[FLEX_ARRAY]; /* more */
 885};
 886
 887#define REF_NORMAL      (1u << 0)
 888#define REF_HEADS       (1u << 1)
 889#define REF_TAGS        (1u << 2)
 890
 891extern struct ref *find_ref_by_name(const struct ref *list, const char *name);
 892
 893#define CONNECT_VERBOSE       (1u << 0)
 894extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 895extern int finish_connect(struct child_process *conn);
 896extern int path_match(const char *path, int nr, char **match);
 897struct extra_have_objects {
 898        int nr, alloc;
 899        unsigned char (*array)[20];
 900};
 901extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags, struct extra_have_objects *);
 902extern int server_supports(const char *feature);
 903
 904extern struct packed_git *parse_pack_index(unsigned char *sha1);
 905
 906extern void prepare_packed_git(void);
 907extern void reprepare_packed_git(void);
 908extern void install_packed_git(struct packed_git *pack);
 909
 910extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 911                                         struct packed_git *packs);
 912
 913extern void pack_report(void);
 914extern int open_pack_index(struct packed_git *);
 915extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 916extern void close_pack_windows(struct packed_git *);
 917extern void unuse_pack(struct pack_window **);
 918extern void free_pack_by_name(const char *);
 919extern void clear_delta_base_cache(void);
 920extern struct packed_git *add_packed_git(const char *, int, int);
 921extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 922extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
 923extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 924extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 925extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 926extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 927extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 928
 929/* Dumb servers support */
 930extern int update_server_info(int);
 931
 932typedef int (*config_fn_t)(const char *, const char *, void *);
 933extern int git_default_config(const char *, const char *, void *);
 934extern int git_config_from_file(config_fn_t fn, const char *, void *);
 935extern int git_config(config_fn_t fn, void *);
 936extern int git_parse_ulong(const char *, unsigned long *);
 937extern int git_config_int(const char *, const char *);
 938extern unsigned long git_config_ulong(const char *, const char *);
 939extern int git_config_bool_or_int(const char *, const char *, int *);
 940extern int git_config_bool(const char *, const char *);
 941extern int git_config_string(const char **, const char *, const char *);
 942extern int git_config_pathname(const char **, const char *, const char *);
 943extern int git_config_set(const char *, const char *);
 944extern int git_config_set_multivar(const char *, const char *, const char *, int);
 945extern int git_config_rename_section(const char *, const char *);
 946extern const char *git_etc_gitconfig(void);
 947extern int check_repository_format_version(const char *var, const char *value, void *cb);
 948extern int git_config_system(void);
 949extern int git_config_global(void);
 950extern int config_error_nonbool(const char *);
 951extern const char *config_exclusive_filename;
 952
 953#define MAX_GITNAME (1000)
 954extern char git_default_email[MAX_GITNAME];
 955extern char git_default_name[MAX_GITNAME];
 956#define IDENT_NAME_GIVEN 01
 957#define IDENT_MAIL_GIVEN 02
 958#define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
 959extern int user_ident_explicitly_given;
 960extern int user_ident_sufficiently_given(void);
 961
 962extern const char *git_commit_encoding;
 963extern const char *git_log_output_encoding;
 964extern const char *git_mailmap_file;
 965
 966/* IO helper functions */
 967extern void maybe_flush_or_die(FILE *, const char *);
 968extern int copy_fd(int ifd, int ofd);
 969extern int copy_file(const char *dst, const char *src, int mode);
 970extern int copy_file_with_time(const char *dst, const char *src, int mode);
 971extern void write_or_die(int fd, const void *buf, size_t count);
 972extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 973extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 974extern void fsync_or_die(int fd, const char *);
 975
 976extern ssize_t read_in_full(int fd, void *buf, size_t count);
 977extern ssize_t write_in_full(int fd, const void *buf, size_t count);
 978static inline ssize_t write_str_in_full(int fd, const char *str)
 979{
 980        return write_in_full(fd, str, strlen(str));
 981}
 982
 983/* pager.c */
 984extern void setup_pager(void);
 985extern const char *pager_program;
 986extern int pager_in_use(void);
 987extern int pager_use_color;
 988
 989extern const char *editor_program;
 990extern const char *excludes_file;
 991
 992/* base85 */
 993int decode_85(char *dst, const char *line, int linelen);
 994void encode_85(char *buf, const unsigned char *data, int bytes);
 995
 996/* alloc.c */
 997extern void *alloc_blob_node(void);
 998extern void *alloc_tree_node(void);
 999extern void *alloc_commit_node(void);
1000extern void *alloc_tag_node(void);
1001extern void *alloc_object_node(void);
1002extern void alloc_report(void);
1003
1004/* trace.c */
1005__attribute__((format (printf, 1, 2)))
1006extern void trace_printf(const char *format, ...);
1007__attribute__((format (printf, 2, 3)))
1008extern void trace_argv_printf(const char **argv, const char *format, ...);
1009
1010/* convert.c */
1011/* returns 1 if *dst was used */
1012extern int convert_to_git(const char *path, const char *src, size_t len,
1013                          struct strbuf *dst, enum safe_crlf checksafe);
1014extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
1015
1016/* add */
1017/*
1018 * return 0 if success, 1 - if addition of a file failed and
1019 * ADD_FILES_IGNORE_ERRORS was specified in flags
1020 */
1021int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
1022
1023/* diff.c */
1024extern int diff_auto_refresh_index;
1025
1026/* match-trees.c */
1027void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1028void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1029
1030/*
1031 * whitespace rules.
1032 * used by both diff and apply
1033 */
1034#define WS_BLANK_AT_EOL         01
1035#define WS_SPACE_BEFORE_TAB     02
1036#define WS_INDENT_WITH_NON_TAB  04
1037#define WS_CR_AT_EOL           010
1038#define WS_BLANK_AT_EOF        020
1039#define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1040#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
1041extern unsigned whitespace_rule_cfg;
1042extern unsigned whitespace_rule(const char *);
1043extern unsigned parse_whitespace_rule(const char *);
1044extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1045extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1046extern char *whitespace_error_string(unsigned ws);
1047extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
1048extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1049
1050/* ls-files */
1051int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
1052void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1053
1054char *alias_lookup(const char *alias);
1055int split_cmdline(char *cmdline, const char ***argv);
1056
1057#endif /* CACHE_H */