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