Andrew's git / gitweb.git / cache.h
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cache.hon commit strbuf API additions and enhancements. (c76689d)
   1#ifndef CACHE_H
   2#define CACHE_H
   3
   4#include "git-compat-util.h"
   5#include "strbuf.h"
   6
   7#include SHA1_HEADER
   8#include <zlib.h>
   9
  10#if ZLIB_VERNUM < 0x1200
  11#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  12#endif
  13
  14#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  15#define DTYPE(de)       ((de)->d_type)
  16#else
  17#undef DT_UNKNOWN
  18#undef DT_DIR
  19#undef DT_REG
  20#undef DT_LNK
  21#define DT_UNKNOWN      0
  22#define DT_DIR          1
  23#define DT_REG          2
  24#define DT_LNK          3
  25#define DTYPE(de)       DT_UNKNOWN
  26#endif
  27
  28/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  29#define S_IFINVALID     0030000
  30
  31/*
  32 * A "directory link" is a link to another git directory.
  33 *
  34 * The value 0160000 is not normally a valid mode, and
  35 * also just happens to be S_IFDIR + S_IFLNK
  36 *
  37 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  38 * always having the same values everywhere. We should use
  39 * our internal git values for these things, and then we can
  40 * translate that to the OS-specific value. It just so
  41 * happens that everybody shares the same bit representation
  42 * in the UNIX world (and apparently wider too..)
  43 */
  44#define S_IFGITLINK     0160000
  45#define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  46
  47/*
  48 * Intensive research over the course of many years has shown that
  49 * port 9418 is totally unused by anything else. Or
  50 *
  51 *      Your search - "port 9418" - did not match any documents.
  52 *
  53 * as www.google.com puts it.
  54 *
  55 * This port has been properly assigned for git use by IANA:
  56 * git (Assigned-9418) [I06-050728-0001].
  57 *
  58 *      git  9418/tcp   git pack transfer service
  59 *      git  9418/udp   git pack transfer service
  60 *
  61 * with Linus Torvalds <torvalds@osdl.org> as the point of
  62 * contact. September 2005.
  63 *
  64 * See http://www.iana.org/assignments/port-numbers
  65 */
  66#define DEFAULT_GIT_PORT 9418
  67
  68/*
  69 * Basic data structures for the directory cache
  70 */
  71
  72#define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  73struct cache_header {
  74        unsigned int hdr_signature;
  75        unsigned int hdr_version;
  76        unsigned int hdr_entries;
  77};
  78
  79/*
  80 * The "cache_time" is just the low 32 bits of the
  81 * time. It doesn't matter if it overflows - we only
  82 * check it for equality in the 32 bits we save.
  83 */
  84struct cache_time {
  85        unsigned int sec;
  86        unsigned int nsec;
  87};
  88
  89/*
  90 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  91 * Again - this is just a (very strong in practice) heuristic that
  92 * the inode hasn't changed.
  93 *
  94 * We save the fields in big-endian order to allow using the
  95 * index file over NFS transparently.
  96 */
  97struct cache_entry {
  98        struct cache_time ce_ctime;
  99        struct cache_time ce_mtime;
 100        unsigned int ce_dev;
 101        unsigned int ce_ino;
 102        unsigned int ce_mode;
 103        unsigned int ce_uid;
 104        unsigned int ce_gid;
 105        unsigned int ce_size;
 106        unsigned char sha1[20];
 107        unsigned short ce_flags;
 108        char name[FLEX_ARRAY]; /* more */
 109};
 110
 111#define CE_NAMEMASK  (0x0fff)
 112#define CE_STAGEMASK (0x3000)
 113#define CE_UPDATE    (0x4000)
 114#define CE_VALID     (0x8000)
 115#define CE_STAGESHIFT 12
 116
 117#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
 118#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
 119#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 120#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 121
 122#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 123static inline unsigned int create_ce_mode(unsigned int mode)
 124{
 125        if (S_ISLNK(mode))
 126                return htonl(S_IFLNK);
 127        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 128                return htonl(S_IFGITLINK);
 129        return htonl(S_IFREG | ce_permissions(mode));
 130}
 131static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 132{
 133        extern int trust_executable_bit, has_symlinks;
 134        if (!has_symlinks && S_ISREG(mode) &&
 135            ce && S_ISLNK(ntohl(ce->ce_mode)))
 136                return ce->ce_mode;
 137        if (!trust_executable_bit && S_ISREG(mode)) {
 138                if (ce && S_ISREG(ntohl(ce->ce_mode)))
 139                        return ce->ce_mode;
 140                return create_ce_mode(0666);
 141        }
 142        return create_ce_mode(mode);
 143}
 144#define canon_mode(mode) \
 145        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 146        S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 147
 148#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 149
 150struct index_state {
 151        struct cache_entry **cache;
 152        unsigned int cache_nr, cache_alloc, cache_changed;
 153        struct cache_tree *cache_tree;
 154        time_t timestamp;
 155        void *mmap;
 156        size_t mmap_size;
 157};
 158
 159extern struct index_state the_index;
 160
 161#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 162#define active_cache (the_index.cache)
 163#define active_nr (the_index.cache_nr)
 164#define active_alloc (the_index.cache_alloc)
 165#define active_cache_changed (the_index.cache_changed)
 166#define active_cache_tree (the_index.cache_tree)
 167
 168#define read_cache() read_index(&the_index)
 169#define read_cache_from(path) read_index_from(&the_index, (path))
 170#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 171#define discard_cache() discard_index(&the_index)
 172#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 173#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 174#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 175#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 176#define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 177#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 178#define ce_match_stat(ce, st, really) ie_match_stat(&the_index, (ce), (st), (really))
 179#define ce_modified(ce, st, really) ie_modified(&the_index, (ce), (st), (really))
 180#endif
 181
 182enum object_type {
 183        OBJ_BAD = -1,
 184        OBJ_NONE = 0,
 185        OBJ_COMMIT = 1,
 186        OBJ_TREE = 2,
 187        OBJ_BLOB = 3,
 188        OBJ_TAG = 4,
 189        /* 5 for future expansion */
 190        OBJ_OFS_DELTA = 6,
 191        OBJ_REF_DELTA = 7,
 192        OBJ_MAX,
 193};
 194
 195#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 196#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 197#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 198#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 199#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 200#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 201#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 202#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 203#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 204#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 205#define GITATTRIBUTES_FILE ".gitattributes"
 206#define INFOATTRIBUTES_FILE "info/attributes"
 207#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 208
 209extern int is_bare_repository_cfg;
 210extern int is_bare_repository(void);
 211extern int is_inside_git_dir(void);
 212extern char *git_work_tree_cfg;
 213extern int is_inside_work_tree(void);
 214extern const char *get_git_dir(void);
 215extern char *get_object_directory(void);
 216extern char *get_refs_directory(void);
 217extern char *get_index_file(void);
 218extern char *get_graft_file(void);
 219extern int set_git_dir(const char *path);
 220extern const char *get_git_work_tree(void);
 221
 222#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 223
 224extern const char **get_pathspec(const char *prefix, const char **pathspec);
 225extern const char *setup_git_directory_gently(int *);
 226extern const char *setup_git_directory(void);
 227extern const char *prefix_path(const char *prefix, int len, const char *path);
 228extern const char *prefix_filename(const char *prefix, int len, const char *path);
 229extern void verify_filename(const char *prefix, const char *name);
 230extern void verify_non_filename(const char *prefix, const char *name);
 231
 232#define alloc_nr(x) (((x)+16)*3/2)
 233
 234/*
 235 * Realloc the buffer pointed at by variable 'x' so that it can hold
 236 * at least 'nr' entries; the number of entries currently allocated
 237 * is 'alloc', using the standard growing factor alloc_nr() macro.
 238 *
 239 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 240 */
 241#define ALLOC_GROW(x, nr, alloc) \
 242        do { \
 243                if ((nr) > alloc) { \
 244                        if (alloc_nr(alloc) < (nr)) \
 245                                alloc = (nr); \
 246                        else \
 247                                alloc = alloc_nr(alloc); \
 248                        x = xrealloc((x), alloc * sizeof(*(x))); \
 249                } \
 250        } while(0)
 251
 252/* Initialize and use the cache information */
 253extern int read_index(struct index_state *);
 254extern int read_index_from(struct index_state *, const char *path);
 255extern int write_index(struct index_state *, int newfd);
 256extern int discard_index(struct index_state *);
 257extern int verify_path(const char *path);
 258extern int index_name_pos(struct index_state *, const char *name, int namelen);
 259#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 260#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 261#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 262#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 263extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 264extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 265extern int remove_index_entry_at(struct index_state *, int pos);
 266extern int remove_file_from_index(struct index_state *, const char *path);
 267extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 268extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 269extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 270extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int);
 271extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int);
 272extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 273extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 274extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 275extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 276extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 277
 278#define REFRESH_REALLY          0x0001  /* ignore_valid */
 279#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 280#define REFRESH_QUIET           0x0004  /* be quiet about it */
 281#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 282extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 283
 284struct lock_file {
 285        struct lock_file *next;
 286        pid_t owner;
 287        char on_list;
 288        char filename[PATH_MAX];
 289};
 290extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 291extern int commit_lock_file(struct lock_file *);
 292
 293extern int hold_locked_index(struct lock_file *, int);
 294extern int commit_locked_index(struct lock_file *);
 295extern void set_alternate_index_output(const char *);
 296
 297extern void rollback_lock_file(struct lock_file *);
 298extern int delete_ref(const char *, const unsigned char *sha1);
 299
 300/* Environment bits from configuration mechanism */
 301extern int trust_executable_bit;
 302extern int quote_path_fully;
 303extern int has_symlinks;
 304extern int assume_unchanged;
 305extern int prefer_symlink_refs;
 306extern int log_all_ref_updates;
 307extern int warn_ambiguous_refs;
 308extern int shared_repository;
 309extern const char *apply_default_whitespace;
 310extern int zlib_compression_level;
 311extern int core_compression_level;
 312extern int core_compression_seen;
 313extern size_t packed_git_window_size;
 314extern size_t packed_git_limit;
 315extern size_t delta_base_cache_limit;
 316extern int auto_crlf;
 317
 318#define GIT_REPO_VERSION 0
 319extern int repository_format_version;
 320extern int check_repository_format(void);
 321
 322#define MTIME_CHANGED   0x0001
 323#define CTIME_CHANGED   0x0002
 324#define OWNER_CHANGED   0x0004
 325#define MODE_CHANGED    0x0008
 326#define INODE_CHANGED   0x0010
 327#define DATA_CHANGED    0x0020
 328#define TYPE_CHANGED    0x0040
 329
 330/* Return a statically allocated filename matching the sha1 signature */
 331extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 332extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 333extern char *sha1_file_name(const unsigned char *sha1);
 334extern char *sha1_pack_name(const unsigned char *sha1);
 335extern char *sha1_pack_index_name(const unsigned char *sha1);
 336extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 337extern const unsigned char null_sha1[20];
 338static inline int is_null_sha1(const unsigned char *sha1)
 339{
 340        return !memcmp(sha1, null_sha1, 20);
 341}
 342static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 343{
 344        return memcmp(sha1, sha2, 20);
 345}
 346static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 347{
 348        memcpy(sha_dst, sha_src, 20);
 349}
 350static inline void hashclr(unsigned char *hash)
 351{
 352        memset(hash, 0, 20);
 353}
 354
 355int git_mkstemp(char *path, size_t n, const char *template);
 356
 357enum sharedrepo {
 358        PERM_UMASK = 0,
 359        PERM_GROUP,
 360        PERM_EVERYBODY
 361};
 362int git_config_perm(const char *var, const char *value);
 363int adjust_shared_perm(const char *path);
 364int safe_create_leading_directories(char *path);
 365char *enter_repo(char *path, int strict);
 366static inline int is_absolute_path(const char *path)
 367{
 368        return path[0] == '/';
 369}
 370const char *make_absolute_path(const char *path);
 371
 372/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 373extern int sha1_object_info(const unsigned char *, unsigned long *);
 374extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 375extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 376extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 377extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 378
 379extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 380
 381extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 382                              size_t bufsize, size_t *bufposn);
 383extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 384extern int move_temp_to_file(const char *tmpfile, const char *filename);
 385
 386extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 387extern int has_sha1_file(const unsigned char *sha1);
 388
 389extern int has_pack_file(const unsigned char *sha1);
 390extern int has_pack_index(const unsigned char *sha1);
 391
 392extern const signed char hexval_table[256];
 393static inline unsigned int hexval(unsigned char c)
 394{
 395        return hexval_table[c];
 396}
 397
 398/* Convert to/from hex/sha1 representation */
 399#define MINIMUM_ABBREV 4
 400#define DEFAULT_ABBREV 7
 401
 402extern int get_sha1(const char *str, unsigned char *sha1);
 403extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 404extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 405extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 406extern int read_ref(const char *filename, unsigned char *sha1);
 407extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 408extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 409extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 410
 411extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 412extern int validate_headref(const char *ref);
 413
 414extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 415extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 416
 417extern void *read_object_with_reference(const unsigned char *sha1,
 418                                        const char *required_type,
 419                                        unsigned long *size,
 420                                        unsigned char *sha1_ret);
 421
 422enum date_mode {
 423        DATE_NORMAL = 0,
 424        DATE_RELATIVE,
 425        DATE_SHORT,
 426        DATE_LOCAL,
 427        DATE_ISO8601,
 428        DATE_RFC2822
 429};
 430
 431const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 432int parse_date(const char *date, char *buf, int bufsize);
 433void datestamp(char *buf, int bufsize);
 434unsigned long approxidate(const char *);
 435
 436extern const char *git_author_info(int);
 437extern const char *git_committer_info(int);
 438extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 439
 440struct checkout {
 441        const char *base_dir;
 442        int base_dir_len;
 443        unsigned force:1,
 444                 quiet:1,
 445                 not_new:1,
 446                 refresh_cache:1;
 447};
 448
 449extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 450extern int has_symlink_leading_path(const char *name, char *last_symlink);
 451
 452extern struct alternate_object_database {
 453        struct alternate_object_database *next;
 454        char *name;
 455        char base[FLEX_ARRAY]; /* more */
 456} *alt_odb_list;
 457extern void prepare_alt_odb(void);
 458
 459struct pack_window {
 460        struct pack_window *next;
 461        unsigned char *base;
 462        off_t offset;
 463        size_t len;
 464        unsigned int last_used;
 465        unsigned int inuse_cnt;
 466};
 467
 468extern struct packed_git {
 469        struct packed_git *next;
 470        struct pack_window *windows;
 471        off_t pack_size;
 472        const void *index_data;
 473        size_t index_size;
 474        uint32_t num_objects;
 475        int index_version;
 476        time_t mtime;
 477        int pack_fd;
 478        int pack_local;
 479        unsigned char sha1[20];
 480        /* something like ".git/objects/pack/xxxxx.pack" */
 481        char pack_name[FLEX_ARRAY]; /* more */
 482} *packed_git;
 483
 484struct pack_entry {
 485        off_t offset;
 486        unsigned char sha1[20];
 487        struct packed_git *p;
 488};
 489
 490struct ref {
 491        struct ref *next;
 492        unsigned char old_sha1[20];
 493        unsigned char new_sha1[20];
 494        unsigned char force;
 495        struct ref *peer_ref; /* when renaming */
 496        char name[FLEX_ARRAY]; /* more */
 497};
 498
 499#define REF_NORMAL      (1u << 0)
 500#define REF_HEADS       (1u << 1)
 501#define REF_TAGS        (1u << 2)
 502
 503#define CONNECT_VERBOSE       (1u << 0)
 504extern pid_t git_connect(int fd[2], char *url, const char *prog, int flags);
 505extern int finish_connect(pid_t pid);
 506extern int path_match(const char *path, int nr, char **match);
 507extern int get_ack(int fd, unsigned char *result_sha1);
 508extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 509extern int server_supports(const char *feature);
 510
 511extern struct packed_git *parse_pack_index(unsigned char *sha1);
 512extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 513                                                const char *idx_path);
 514
 515extern void prepare_packed_git(void);
 516extern void reprepare_packed_git(void);
 517extern void install_packed_git(struct packed_git *pack);
 518
 519extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 520                                         struct packed_git *packs);
 521
 522extern void pack_report(void);
 523extern int open_pack_index(struct packed_git *);
 524extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 525extern void unuse_pack(struct pack_window **);
 526extern struct packed_git *add_packed_git(const char *, int, int);
 527extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 528extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 529extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 530extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 531extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 532extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 533
 534/* Dumb servers support */
 535extern int update_server_info(int);
 536
 537typedef int (*config_fn_t)(const char *, const char *);
 538extern int git_default_config(const char *, const char *);
 539extern int git_config_from_file(config_fn_t fn, const char *);
 540extern int git_config(config_fn_t fn);
 541extern int git_parse_long(const char *, long *);
 542extern int git_parse_ulong(const char *, unsigned long *);
 543extern int git_config_int(const char *, const char *);
 544extern unsigned long git_config_ulong(const char *, const char *);
 545extern int git_config_bool(const char *, const char *);
 546extern int git_config_set(const char *, const char *);
 547extern int git_config_set_multivar(const char *, const char *, const char *, int);
 548extern int git_config_rename_section(const char *, const char *);
 549extern int check_repository_format_version(const char *var, const char *value);
 550
 551#define MAX_GITNAME (1000)
 552extern char git_default_email[MAX_GITNAME];
 553extern char git_default_name[MAX_GITNAME];
 554
 555extern const char *git_commit_encoding;
 556extern const char *git_log_output_encoding;
 557
 558/* IO helper functions */
 559extern void maybe_flush_or_die(FILE *, const char *);
 560extern int copy_fd(int ifd, int ofd);
 561extern int read_in_full(int fd, void *buf, size_t count);
 562extern int write_in_full(int fd, const void *buf, size_t count);
 563extern void write_or_die(int fd, const void *buf, size_t count);
 564extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 565extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 566
 567/* pager.c */
 568extern void setup_pager(void);
 569extern char *pager_program;
 570extern int pager_in_use;
 571extern int pager_use_color;
 572
 573extern char *editor_program;
 574
 575/* base85 */
 576int decode_85(char *dst, const char *line, int linelen);
 577void encode_85(char *buf, const unsigned char *data, int bytes);
 578
 579/* alloc.c */
 580extern void *alloc_blob_node(void);
 581extern void *alloc_tree_node(void);
 582extern void *alloc_commit_node(void);
 583extern void *alloc_tag_node(void);
 584extern void *alloc_object_node(void);
 585extern void alloc_report(void);
 586
 587/* trace.c */
 588extern void trace_printf(const char *format, ...);
 589extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 590
 591/* convert.c */
 592/* returns 1 if *dst was used */
 593extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 594extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 595
 596/* diff.c */
 597extern int diff_auto_refresh_index;
 598
 599/* match-trees.c */
 600void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 601
 602#endif /* CACHE_H */