Andrew's git - gitweb.git/blob

0b69c92daa975d116c54e3b5000bc9a744a007dd
   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        struct cache_entry *next;
 114        unsigned int ce_ctime;
 115        unsigned int ce_mtime;
 116        unsigned int ce_dev;
 117        unsigned int ce_ino;
 118        unsigned int ce_mode;
 119        unsigned int ce_uid;
 120        unsigned int ce_gid;
 121        unsigned int ce_size;
 122        unsigned int ce_flags;
 123        unsigned char sha1[20];
 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
 137#define CE_HASHED    (0x100000)
 138#define CE_UNHASHED  (0x200000)
 139
 140static inline unsigned create_ce_flags(size_t len, unsigned stage)
 141{
 142        if (len >= CE_NAMEMASK)
 143                len = CE_NAMEMASK;
 144        return (len | (stage << CE_STAGESHIFT));
 145}
 146
 147static inline size_t ce_namelen(const struct cache_entry *ce)
 148{
 149        size_t len = ce->ce_flags & CE_NAMEMASK;
 150        if (len < CE_NAMEMASK)
 151                return len;
 152        return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 153}
 154
 155#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 156#define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
 157#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 158#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 159#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 160
 161#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 162static inline unsigned int create_ce_mode(unsigned int mode)
 163{
 164        if (S_ISLNK(mode))
 165                return S_IFLNK;
 166        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 167                return S_IFGITLINK;
 168        return S_IFREG | ce_permissions(mode);
 169}
 170static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 171{
 172        extern int trust_executable_bit, has_symlinks;
 173        if (!has_symlinks && S_ISREG(mode) &&
 174            ce && S_ISLNK(ce->ce_mode))
 175                return ce->ce_mode;
 176        if (!trust_executable_bit && S_ISREG(mode)) {
 177                if (ce && S_ISREG(ce->ce_mode))
 178                        return ce->ce_mode;
 179                return create_ce_mode(0666);
 180        }
 181        return create_ce_mode(mode);
 182}
 183static inline int ce_to_dtype(const struct cache_entry *ce)
 184{
 185        unsigned ce_mode = ntohl(ce->ce_mode);
 186        if (S_ISREG(ce_mode))
 187                return DT_REG;
 188        else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 189                return DT_DIR;
 190        else if (S_ISLNK(ce_mode))
 191                return DT_LNK;
 192        else
 193                return DT_UNKNOWN;
 194}
 195#define canon_mode(mode) \
 196        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 197        S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 198
 199#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 200#define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
 201
 202struct index_state {
 203        struct cache_entry **cache;
 204        unsigned int cache_nr, cache_alloc, cache_changed;
 205        struct cache_tree *cache_tree;
 206        time_t timestamp;
 207        void *alloc;
 208        unsigned name_hash_initialized : 1;
 209        struct hash_table name_hash;
 210};
 211
 212extern struct index_state the_index;
 213
 214#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 215#define active_cache (the_index.cache)
 216#define active_nr (the_index.cache_nr)
 217#define active_alloc (the_index.cache_alloc)
 218#define active_cache_changed (the_index.cache_changed)
 219#define active_cache_tree (the_index.cache_tree)
 220
 221#define read_cache() read_index(&the_index)
 222#define read_cache_from(path) read_index_from(&the_index, (path))
 223#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 224#define discard_cache() discard_index(&the_index)
 225#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 226#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 227#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 228#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 229#define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 230#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 231#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 232#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 233#define cache_name_exists(name, namelen) index_name_exists(&the_index, (name), (namelen))
 234#endif
 235
 236enum object_type {
 237        OBJ_BAD = -1,
 238        OBJ_NONE = 0,
 239        OBJ_COMMIT = 1,
 240        OBJ_TREE = 2,
 241        OBJ_BLOB = 3,
 242        OBJ_TAG = 4,
 243        /* 5 for future expansion */
 244        OBJ_OFS_DELTA = 6,
 245        OBJ_REF_DELTA = 7,
 246        OBJ_MAX,
 247};
 248
 249static inline enum object_type object_type(unsigned int mode)
 250{
 251        return S_ISDIR(mode) ? OBJ_TREE :
 252                S_ISGITLINK(mode) ? OBJ_COMMIT :
 253                OBJ_BLOB;
 254}
 255
 256#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 257#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 258#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 259#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 260#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 261#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 262#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 263#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 264#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 265#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 266#define GITATTRIBUTES_FILE ".gitattributes"
 267#define INFOATTRIBUTES_FILE "info/attributes"
 268#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 269
 270extern int is_bare_repository_cfg;
 271extern int is_bare_repository(void);
 272extern int is_inside_git_dir(void);
 273extern char *git_work_tree_cfg;
 274extern int is_inside_work_tree(void);
 275extern const char *get_git_dir(void);
 276extern char *get_object_directory(void);
 277extern char *get_refs_directory(void);
 278extern char *get_index_file(void);
 279extern char *get_graft_file(void);
 280extern int set_git_dir(const char *path);
 281extern const char *get_git_work_tree(void);
 282
 283#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 284
 285extern const char **get_pathspec(const char *prefix, const char **pathspec);
 286extern void setup_work_tree(void);
 287extern const char *setup_git_directory_gently(int *);
 288extern const char *setup_git_directory(void);
 289extern const char *prefix_path(const char *prefix, int len, const char *path);
 290extern const char *prefix_filename(const char *prefix, int len, const char *path);
 291extern void verify_filename(const char *prefix, const char *name);
 292extern void verify_non_filename(const char *prefix, const char *name);
 293
 294#define alloc_nr(x) (((x)+16)*3/2)
 295
 296/*
 297 * Realloc the buffer pointed at by variable 'x' so that it can hold
 298 * at least 'nr' entries; the number of entries currently allocated
 299 * is 'alloc', using the standard growing factor alloc_nr() macro.
 300 *
 301 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 302 */
 303#define ALLOC_GROW(x, nr, alloc) \
 304        do { \
 305                if ((nr) > alloc) { \
 306                        if (alloc_nr(alloc) < (nr)) \
 307                                alloc = (nr); \
 308                        else \
 309                                alloc = alloc_nr(alloc); \
 310                        x = xrealloc((x), alloc * sizeof(*(x))); \
 311                } \
 312        } while(0)
 313
 314/* Initialize and use the cache information */
 315extern int read_index(struct index_state *);
 316extern int read_index_from(struct index_state *, const char *path);
 317extern int write_index(struct index_state *, int newfd);
 318extern int discard_index(struct index_state *);
 319extern int verify_path(const char *path);
 320extern int index_name_exists(struct index_state *istate, const char *name, int namelen);
 321extern int index_name_pos(struct index_state *, const char *name, int namelen);
 322#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 323#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 324#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 325#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 326extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 327extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 328extern int remove_index_entry_at(struct index_state *, int pos);
 329extern int remove_file_from_index(struct index_state *, const char *path);
 330extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 331extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 332extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 333
 334/* do stat comparison even if CE_VALID is true */
 335#define CE_MATCH_IGNORE_VALID           01
 336/* do not check the contents but report dirty on racily-clean entries */
 337#define CE_MATCH_RACY_IS_DIRTY  02
 338extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 339extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 340
 341extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 342extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 343extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 344extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 345extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 346
 347#define REFRESH_REALLY          0x0001  /* ignore_valid */
 348#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 349#define REFRESH_QUIET           0x0004  /* be quiet about it */
 350#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 351extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 352
 353struct lock_file {
 354        struct lock_file *next;
 355        int fd;
 356        pid_t owner;
 357        char on_list;
 358        char filename[PATH_MAX];
 359};
 360extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 361extern int commit_lock_file(struct lock_file *);
 362
 363extern int hold_locked_index(struct lock_file *, int);
 364extern int commit_locked_index(struct lock_file *);
 365extern void set_alternate_index_output(const char *);
 366extern int close_lock_file(struct lock_file *);
 367extern void rollback_lock_file(struct lock_file *);
 368extern int delete_ref(const char *, const unsigned char *sha1);
 369
 370/* Environment bits from configuration mechanism */
 371extern int trust_executable_bit;
 372extern int quote_path_fully;
 373extern int has_symlinks;
 374extern int assume_unchanged;
 375extern int prefer_symlink_refs;
 376extern int log_all_ref_updates;
 377extern int warn_ambiguous_refs;
 378extern int shared_repository;
 379extern const char *apply_default_whitespace;
 380extern int zlib_compression_level;
 381extern int core_compression_level;
 382extern int core_compression_seen;
 383extern size_t packed_git_window_size;
 384extern size_t packed_git_limit;
 385extern size_t delta_base_cache_limit;
 386extern int auto_crlf;
 387
 388enum safe_crlf {
 389        SAFE_CRLF_FALSE = 0,
 390        SAFE_CRLF_FAIL = 1,
 391        SAFE_CRLF_WARN = 2,
 392};
 393
 394extern enum safe_crlf safe_crlf;
 395
 396#define GIT_REPO_VERSION 0
 397extern int repository_format_version;
 398extern int check_repository_format(void);
 399
 400#define MTIME_CHANGED   0x0001
 401#define CTIME_CHANGED   0x0002
 402#define OWNER_CHANGED   0x0004
 403#define MODE_CHANGED    0x0008
 404#define INODE_CHANGED   0x0010
 405#define DATA_CHANGED    0x0020
 406#define TYPE_CHANGED    0x0040
 407
 408/* Return a statically allocated filename matching the sha1 signature */
 409extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 410extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 411extern char *sha1_file_name(const unsigned char *sha1);
 412extern char *sha1_pack_name(const unsigned char *sha1);
 413extern char *sha1_pack_index_name(const unsigned char *sha1);
 414extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 415extern const unsigned char null_sha1[20];
 416static inline int is_null_sha1(const unsigned char *sha1)
 417{
 418        return !memcmp(sha1, null_sha1, 20);
 419}
 420static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 421{
 422        return memcmp(sha1, sha2, 20);
 423}
 424static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 425{
 426        memcpy(sha_dst, sha_src, 20);
 427}
 428static inline void hashclr(unsigned char *hash)
 429{
 430        memset(hash, 0, 20);
 431}
 432
 433int git_mkstemp(char *path, size_t n, const char *template);
 434
 435enum sharedrepo {
 436        PERM_UMASK = 0,
 437        PERM_GROUP,
 438        PERM_EVERYBODY
 439};
 440int git_config_perm(const char *var, const char *value);
 441int adjust_shared_perm(const char *path);
 442int safe_create_leading_directories(char *path);
 443char *enter_repo(char *path, int strict);
 444static inline int is_absolute_path(const char *path)
 445{
 446        return path[0] == '/';
 447}
 448const char *make_absolute_path(const char *path);
 449
 450/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 451extern int sha1_object_info(const unsigned char *, unsigned long *);
 452extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 453extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 454extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 455extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 456
 457extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 458
 459extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 460                              size_t bufsize, size_t *bufposn);
 461extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 462extern int move_temp_to_file(const char *tmpfile, const char *filename);
 463
 464extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 465extern int has_sha1_file(const unsigned char *sha1);
 466
 467extern int has_pack_file(const unsigned char *sha1);
 468extern int has_pack_index(const unsigned char *sha1);
 469
 470extern const signed char hexval_table[256];
 471static inline unsigned int hexval(unsigned char c)
 472{
 473        return hexval_table[c];
 474}
 475
 476/* Convert to/from hex/sha1 representation */
 477#define MINIMUM_ABBREV 4
 478#define DEFAULT_ABBREV 7
 479
 480extern int get_sha1(const char *str, unsigned char *sha1);
 481extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 482extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 483extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 484extern int read_ref(const char *filename, unsigned char *sha1);
 485extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 486extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 487extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 488
 489extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 490extern const char *ref_rev_parse_rules[];
 491extern const char *ref_fetch_rules[];
 492
 493extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 494extern int validate_headref(const char *ref);
 495
 496extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 497extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 498
 499extern void *read_object_with_reference(const unsigned char *sha1,
 500                                        const char *required_type,
 501                                        unsigned long *size,
 502                                        unsigned char *sha1_ret);
 503
 504enum date_mode {
 505        DATE_NORMAL = 0,
 506        DATE_RELATIVE,
 507        DATE_SHORT,
 508        DATE_LOCAL,
 509        DATE_ISO8601,
 510        DATE_RFC2822
 511};
 512
 513const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 514int parse_date(const char *date, char *buf, int bufsize);
 515void datestamp(char *buf, int bufsize);
 516unsigned long approxidate(const char *);
 517enum date_mode parse_date_format(const char *format);
 518
 519#define IDENT_WARN_ON_NO_NAME  1
 520#define IDENT_ERROR_ON_NO_NAME 2
 521#define IDENT_NO_DATE          4
 522extern const char *git_author_info(int);
 523extern const char *git_committer_info(int);
 524extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 525extern const char *fmt_name(const char *name, const char *email);
 526
 527struct checkout {
 528        const char *base_dir;
 529        int base_dir_len;
 530        unsigned force:1,
 531                 quiet:1,
 532                 not_new:1,
 533                 refresh_cache:1;
 534};
 535
 536extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 537extern int has_symlink_leading_path(const char *name, char *last_symlink);
 538
 539extern struct alternate_object_database {
 540        struct alternate_object_database *next;
 541        char *name;
 542        char base[FLEX_ARRAY]; /* more */
 543} *alt_odb_list;
 544extern void prepare_alt_odb(void);
 545
 546struct pack_window {
 547        struct pack_window *next;
 548        unsigned char *base;
 549        off_t offset;
 550        size_t len;
 551        unsigned int last_used;
 552        unsigned int inuse_cnt;
 553};
 554
 555extern struct packed_git {
 556        struct packed_git *next;
 557        struct pack_window *windows;
 558        off_t pack_size;
 559        const void *index_data;
 560        size_t index_size;
 561        uint32_t num_objects;
 562        int index_version;
 563        time_t mtime;
 564        int pack_fd;
 565        int pack_local;
 566        unsigned char sha1[20];
 567        /* something like ".git/objects/pack/xxxxx.pack" */
 568        char pack_name[FLEX_ARRAY]; /* more */
 569} *packed_git;
 570
 571struct pack_entry {
 572        off_t offset;
 573        unsigned char sha1[20];
 574        struct packed_git *p;
 575};
 576
 577struct ref {
 578        struct ref *next;
 579        unsigned char old_sha1[20];
 580        unsigned char new_sha1[20];
 581        unsigned int force:1,
 582                merge:1,
 583                nonfastforward:1,
 584                deletion:1;
 585        enum {
 586                REF_STATUS_NONE = 0,
 587                REF_STATUS_OK,
 588                REF_STATUS_REJECT_NONFASTFORWARD,
 589                REF_STATUS_REJECT_NODELETE,
 590                REF_STATUS_UPTODATE,
 591                REF_STATUS_REMOTE_REJECT,
 592                REF_STATUS_EXPECTING_REPORT,
 593        } status;
 594        char *remote_status;
 595        struct ref *peer_ref; /* when renaming */
 596        char name[FLEX_ARRAY]; /* more */
 597};
 598
 599#define REF_NORMAL      (1u << 0)
 600#define REF_HEADS       (1u << 1)
 601#define REF_TAGS        (1u << 2)
 602
 603extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 604
 605#define CONNECT_VERBOSE       (1u << 0)
 606extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 607extern int finish_connect(struct child_process *conn);
 608extern int path_match(const char *path, int nr, char **match);
 609extern int get_ack(int fd, unsigned char *result_sha1);
 610extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 611extern int server_supports(const char *feature);
 612
 613extern struct packed_git *parse_pack_index(unsigned char *sha1);
 614extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 615                                                const char *idx_path);
 616
 617extern void prepare_packed_git(void);
 618extern void reprepare_packed_git(void);
 619extern void install_packed_git(struct packed_git *pack);
 620
 621extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 622                                         struct packed_git *packs);
 623
 624extern void pack_report(void);
 625extern int open_pack_index(struct packed_git *);
 626extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 627extern void close_pack_windows(struct packed_git *);
 628extern void unuse_pack(struct pack_window **);
 629extern struct packed_git *add_packed_git(const char *, int, int);
 630extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 631extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 632extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 633extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 634extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 635extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 636extern int matches_pack_name(struct packed_git *p, const char *name);
 637
 638/* Dumb servers support */
 639extern int update_server_info(int);
 640
 641typedef int (*config_fn_t)(const char *, const char *);
 642extern int git_default_config(const char *, const char *);
 643extern int git_config_from_file(config_fn_t fn, const char *);
 644extern int git_config(config_fn_t fn);
 645extern int git_parse_long(const char *, long *);
 646extern int git_parse_ulong(const char *, unsigned long *);
 647extern int git_config_int(const char *, const char *);
 648extern unsigned long git_config_ulong(const char *, const char *);
 649extern int git_config_bool(const char *, const char *);
 650extern int git_config_string(const char **, const char *, const char *);
 651extern int git_config_set(const char *, const char *);
 652extern int git_config_set_multivar(const char *, const char *, const char *, int);
 653extern int git_config_rename_section(const char *, const char *);
 654extern const char *git_etc_gitconfig(void);
 655extern int check_repository_format_version(const char *var, const char *value);
 656extern int git_env_bool(const char *, int);
 657extern int git_config_system(void);
 658extern int git_config_global(void);
 659extern int config_error_nonbool(const char *);
 660
 661#define MAX_GITNAME (1000)
 662extern char git_default_email[MAX_GITNAME];
 663extern char git_default_name[MAX_GITNAME];
 664
 665extern const char *git_commit_encoding;
 666extern const char *git_log_output_encoding;
 667
 668/* IO helper functions */
 669extern void maybe_flush_or_die(FILE *, const char *);
 670extern int copy_fd(int ifd, int ofd);
 671extern int read_in_full(int fd, void *buf, size_t count);
 672extern int write_in_full(int fd, const void *buf, size_t count);
 673extern void write_or_die(int fd, const void *buf, size_t count);
 674extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 675extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 676
 677/* pager.c */
 678extern void setup_pager(void);
 679extern const char *pager_program;
 680extern int pager_in_use(void);
 681extern int pager_use_color;
 682
 683extern const char *editor_program;
 684extern const char *excludes_file;
 685
 686/* base85 */
 687int decode_85(char *dst, const char *line, int linelen);
 688void encode_85(char *buf, const unsigned char *data, int bytes);
 689
 690/* alloc.c */
 691extern void *alloc_blob_node(void);
 692extern void *alloc_tree_node(void);
 693extern void *alloc_commit_node(void);
 694extern void *alloc_tag_node(void);
 695extern void *alloc_object_node(void);
 696extern void alloc_report(void);
 697
 698/* trace.c */
 699extern void trace_printf(const char *format, ...);
 700extern void trace_argv_printf(const char **argv, const char *format, ...);
 701
 702/* convert.c */
 703/* returns 1 if *dst was used */
 704extern int convert_to_git(const char *path, const char *src, size_t len,
 705                          struct strbuf *dst, enum safe_crlf checksafe);
 706extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 707
 708/* add */
 709void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 710
 711/* diff.c */
 712extern int diff_auto_refresh_index;
 713
 714/* match-trees.c */
 715void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 716
 717/*
 718 * whitespace rules.
 719 * used by both diff and apply
 720 */
 721#define WS_TRAILING_SPACE       01
 722#define WS_SPACE_BEFORE_TAB     02
 723#define WS_INDENT_WITH_NON_TAB  04
 724#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 725extern unsigned whitespace_rule_cfg;
 726extern unsigned whitespace_rule(const char *);
 727extern unsigned parse_whitespace_rule(const char *);
 728extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 729    FILE *stream, const char *set,
 730    const char *reset, const char *ws);
 731extern char *whitespace_error_string(unsigned ws);
 732
 733/* ls-files */
 734int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 735int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 736void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 737
 738#endif /* CACHE_H */