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
   7#include SHA1_HEADER
   8#include <zlib.h>
   9
  10#if defined(NO_DEFLATE_BOUND) || 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, options) ie_match_stat(&the_index, (ce), (st), (options))
 179#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 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
 195static inline enum object_type object_type(unsigned int mode)
 196{
 197        return S_ISDIR(mode) ? OBJ_TREE :
 198                S_ISGITLINK(mode) ? OBJ_COMMIT :
 199                OBJ_BLOB;
 200}
 201
 202#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 203#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 204#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 205#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 206#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 207#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 208#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 209#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 210#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 211#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 212#define GITATTRIBUTES_FILE ".gitattributes"
 213#define INFOATTRIBUTES_FILE "info/attributes"
 214#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 215
 216extern int is_bare_repository_cfg;
 217extern int is_bare_repository(void);
 218extern int is_inside_git_dir(void);
 219extern char *git_work_tree_cfg;
 220extern int is_inside_work_tree(void);
 221extern const char *get_git_dir(void);
 222extern char *get_object_directory(void);
 223extern char *get_refs_directory(void);
 224extern char *get_index_file(void);
 225extern char *get_graft_file(void);
 226extern int set_git_dir(const char *path);
 227extern const char *get_git_work_tree(void);
 228
 229#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 230
 231extern const char **get_pathspec(const char *prefix, const char **pathspec);
 232extern void setup_work_tree(void);
 233extern const char *setup_git_directory_gently(int *);
 234extern const char *setup_git_directory(void);
 235extern const char *prefix_path(const char *prefix, int len, const char *path);
 236extern const char *prefix_filename(const char *prefix, int len, const char *path);
 237extern void verify_filename(const char *prefix, const char *name);
 238extern void verify_non_filename(const char *prefix, const char *name);
 239
 240#define alloc_nr(x) (((x)+16)*3/2)
 241
 242/*
 243 * Realloc the buffer pointed at by variable 'x' so that it can hold
 244 * at least 'nr' entries; the number of entries currently allocated
 245 * is 'alloc', using the standard growing factor alloc_nr() macro.
 246 *
 247 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 248 */
 249#define ALLOC_GROW(x, nr, alloc) \
 250        do { \
 251                if ((nr) > alloc) { \
 252                        if (alloc_nr(alloc) < (nr)) \
 253                                alloc = (nr); \
 254                        else \
 255                                alloc = alloc_nr(alloc); \
 256                        x = xrealloc((x), alloc * sizeof(*(x))); \
 257                } \
 258        } while(0)
 259
 260/* Initialize and use the cache information */
 261extern int read_index(struct index_state *);
 262extern int read_index_from(struct index_state *, const char *path);
 263extern int write_index(struct index_state *, int newfd);
 264extern int discard_index(struct index_state *);
 265extern int verify_path(const char *path);
 266extern int index_name_pos(struct index_state *, const char *name, int namelen);
 267#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 268#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 269#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 270#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 271extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 272extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 273extern int remove_index_entry_at(struct index_state *, int pos);
 274extern int remove_file_from_index(struct index_state *, const char *path);
 275extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 276extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 277extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 278
 279/* do stat comparison even if CE_VALID is true */
 280#define CE_MATCH_IGNORE_VALID           01
 281/* do not check the contents but report dirty on racily-clean entries */
 282#define CE_MATCH_RACY_IS_DIRTY  02
 283extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 284extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 285
 286extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 287extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 288extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 289extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 290extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 291
 292#define REFRESH_REALLY          0x0001  /* ignore_valid */
 293#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 294#define REFRESH_QUIET           0x0004  /* be quiet about it */
 295#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 296extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 297
 298struct lock_file {
 299        struct lock_file *next;
 300        int fd;
 301        pid_t owner;
 302        char on_list;
 303        char filename[PATH_MAX];
 304};
 305extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 306extern int commit_lock_file(struct lock_file *);
 307
 308extern int hold_locked_index(struct lock_file *, int);
 309extern int commit_locked_index(struct lock_file *);
 310extern void set_alternate_index_output(const char *);
 311
 312extern void rollback_lock_file(struct lock_file *);
 313extern int delete_ref(const char *, const unsigned char *sha1);
 314
 315/* Environment bits from configuration mechanism */
 316extern int trust_executable_bit;
 317extern int quote_path_fully;
 318extern int has_symlinks;
 319extern int assume_unchanged;
 320extern int prefer_symlink_refs;
 321extern int log_all_ref_updates;
 322extern int warn_ambiguous_refs;
 323extern int shared_repository;
 324extern const char *apply_default_whitespace;
 325extern int zlib_compression_level;
 326extern int core_compression_level;
 327extern int core_compression_seen;
 328extern size_t packed_git_window_size;
 329extern size_t packed_git_limit;
 330extern size_t delta_base_cache_limit;
 331extern int auto_crlf;
 332
 333#define GIT_REPO_VERSION 0
 334extern int repository_format_version;
 335extern int check_repository_format(void);
 336
 337#define MTIME_CHANGED   0x0001
 338#define CTIME_CHANGED   0x0002
 339#define OWNER_CHANGED   0x0004
 340#define MODE_CHANGED    0x0008
 341#define INODE_CHANGED   0x0010
 342#define DATA_CHANGED    0x0020
 343#define TYPE_CHANGED    0x0040
 344
 345/* Return a statically allocated filename matching the sha1 signature */
 346extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 347extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 348extern char *sha1_file_name(const unsigned char *sha1);
 349extern char *sha1_pack_name(const unsigned char *sha1);
 350extern char *sha1_pack_index_name(const unsigned char *sha1);
 351extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 352extern const unsigned char null_sha1[20];
 353static inline int is_null_sha1(const unsigned char *sha1)
 354{
 355        return !memcmp(sha1, null_sha1, 20);
 356}
 357static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 358{
 359        return memcmp(sha1, sha2, 20);
 360}
 361static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 362{
 363        memcpy(sha_dst, sha_src, 20);
 364}
 365static inline void hashclr(unsigned char *hash)
 366{
 367        memset(hash, 0, 20);
 368}
 369
 370int git_mkstemp(char *path, size_t n, const char *template);
 371
 372enum sharedrepo {
 373        PERM_UMASK = 0,
 374        PERM_GROUP,
 375        PERM_EVERYBODY
 376};
 377int git_config_perm(const char *var, const char *value);
 378int adjust_shared_perm(const char *path);
 379int safe_create_leading_directories(char *path);
 380char *enter_repo(char *path, int strict);
 381static inline int is_absolute_path(const char *path)
 382{
 383        return path[0] == '/';
 384}
 385const char *make_absolute_path(const char *path);
 386
 387/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 388extern int sha1_object_info(const unsigned char *, unsigned long *);
 389extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 390extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 391extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 392extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 393
 394extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 395
 396extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 397                              size_t bufsize, size_t *bufposn);
 398extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 399extern int move_temp_to_file(const char *tmpfile, const char *filename);
 400
 401extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 402extern int has_sha1_file(const unsigned char *sha1);
 403
 404extern int has_pack_file(const unsigned char *sha1);
 405extern int has_pack_index(const unsigned char *sha1);
 406
 407extern const signed char hexval_table[256];
 408static inline unsigned int hexval(unsigned char c)
 409{
 410        return hexval_table[c];
 411}
 412
 413/* Convert to/from hex/sha1 representation */
 414#define MINIMUM_ABBREV 4
 415#define DEFAULT_ABBREV 7
 416
 417extern int get_sha1(const char *str, unsigned char *sha1);
 418extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 419extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 420extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 421extern int read_ref(const char *filename, unsigned char *sha1);
 422extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 423extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 424extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 425
 426extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 427extern int validate_headref(const char *ref);
 428
 429extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 430extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 431
 432extern void *read_object_with_reference(const unsigned char *sha1,
 433                                        const char *required_type,
 434                                        unsigned long *size,
 435                                        unsigned char *sha1_ret);
 436
 437enum date_mode {
 438        DATE_NORMAL = 0,
 439        DATE_RELATIVE,
 440        DATE_SHORT,
 441        DATE_LOCAL,
 442        DATE_ISO8601,
 443        DATE_RFC2822
 444};
 445
 446const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 447int parse_date(const char *date, char *buf, int bufsize);
 448void datestamp(char *buf, int bufsize);
 449unsigned long approxidate(const char *);
 450enum date_mode parse_date_format(const char *format);
 451
 452extern const char *git_author_info(int);
 453extern const char *git_committer_info(int);
 454extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 455
 456struct checkout {
 457        const char *base_dir;
 458        int base_dir_len;
 459        unsigned force:1,
 460                 quiet:1,
 461                 not_new:1,
 462                 refresh_cache:1;
 463};
 464
 465extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 466extern int has_symlink_leading_path(const char *name, char *last_symlink);
 467
 468extern struct alternate_object_database {
 469        struct alternate_object_database *next;
 470        char *name;
 471        char base[FLEX_ARRAY]; /* more */
 472} *alt_odb_list;
 473extern void prepare_alt_odb(void);
 474
 475struct pack_window {
 476        struct pack_window *next;
 477        unsigned char *base;
 478        off_t offset;
 479        size_t len;
 480        unsigned int last_used;
 481        unsigned int inuse_cnt;
 482};
 483
 484extern struct packed_git {
 485        struct packed_git *next;
 486        struct pack_window *windows;
 487        off_t pack_size;
 488        const void *index_data;
 489        size_t index_size;
 490        uint32_t num_objects;
 491        int index_version;
 492        time_t mtime;
 493        int pack_fd;
 494        int pack_local;
 495        unsigned char sha1[20];
 496        /* something like ".git/objects/pack/xxxxx.pack" */
 497        char pack_name[FLEX_ARRAY]; /* more */
 498} *packed_git;
 499
 500struct pack_entry {
 501        off_t offset;
 502        unsigned char sha1[20];
 503        struct packed_git *p;
 504};
 505
 506struct ref {
 507        struct ref *next;
 508        unsigned char old_sha1[20];
 509        unsigned char new_sha1[20];
 510        unsigned int force:1,
 511                merge:1,
 512                nonfastforward:1,
 513                deletion:1;
 514        enum {
 515                REF_STATUS_NONE = 0,
 516                REF_STATUS_OK,
 517                REF_STATUS_REJECT_NONFASTFORWARD,
 518                REF_STATUS_REJECT_NODELETE,
 519                REF_STATUS_UPTODATE,
 520                REF_STATUS_REMOTE_REJECT,
 521                REF_STATUS_EXPECTING_REPORT,
 522        } status;
 523        char *remote_status;
 524        struct ref *peer_ref; /* when renaming */
 525        char name[FLEX_ARRAY]; /* more */
 526};
 527
 528#define REF_NORMAL      (1u << 0)
 529#define REF_HEADS       (1u << 1)
 530#define REF_TAGS        (1u << 2)
 531
 532extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 533
 534#define CONNECT_VERBOSE       (1u << 0)
 535extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 536extern int finish_connect(struct child_process *conn);
 537extern int path_match(const char *path, int nr, char **match);
 538extern int get_ack(int fd, unsigned char *result_sha1);
 539extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 540extern int server_supports(const char *feature);
 541
 542extern struct packed_git *parse_pack_index(unsigned char *sha1);
 543extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 544                                                const char *idx_path);
 545
 546extern void prepare_packed_git(void);
 547extern void reprepare_packed_git(void);
 548extern void install_packed_git(struct packed_git *pack);
 549
 550extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 551                                         struct packed_git *packs);
 552
 553extern void pack_report(void);
 554extern int open_pack_index(struct packed_git *);
 555extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 556extern void unuse_pack(struct pack_window **);
 557extern struct packed_git *add_packed_git(const char *, int, int);
 558extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 559extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 560extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 561extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 562extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 563extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 564extern int matches_pack_name(struct packed_git *p, const char *name);
 565
 566/* Dumb servers support */
 567extern int update_server_info(int);
 568
 569typedef int (*config_fn_t)(const char *, const char *);
 570extern int git_default_config(const char *, const char *);
 571extern int git_config_from_file(config_fn_t fn, const char *);
 572extern int git_config(config_fn_t fn);
 573extern int git_parse_long(const char *, long *);
 574extern int git_parse_ulong(const char *, unsigned long *);
 575extern int git_config_int(const char *, const char *);
 576extern unsigned long git_config_ulong(const char *, const char *);
 577extern int git_config_bool(const char *, const char *);
 578extern int git_config_set(const char *, const char *);
 579extern int git_config_set_multivar(const char *, const char *, const char *, int);
 580extern int git_config_rename_section(const char *, const char *);
 581extern const char *git_etc_gitconfig(void);
 582extern int check_repository_format_version(const char *var, const char *value);
 583
 584#define MAX_GITNAME (1000)
 585extern char git_default_email[MAX_GITNAME];
 586extern char git_default_name[MAX_GITNAME];
 587
 588extern const char *git_commit_encoding;
 589extern const char *git_log_output_encoding;
 590
 591/* IO helper functions */
 592extern void maybe_flush_or_die(FILE *, const char *);
 593extern int copy_fd(int ifd, int ofd);
 594extern int read_in_full(int fd, void *buf, size_t count);
 595extern int write_in_full(int fd, const void *buf, size_t count);
 596extern void write_or_die(int fd, const void *buf, size_t count);
 597extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 598extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 599
 600/* pager.c */
 601extern void setup_pager(void);
 602extern char *pager_program;
 603extern int pager_in_use;
 604extern int pager_use_color;
 605
 606extern char *editor_program;
 607extern char *excludes_file;
 608
 609/* base85 */
 610int decode_85(char *dst, const char *line, int linelen);
 611void encode_85(char *buf, const unsigned char *data, int bytes);
 612
 613/* alloc.c */
 614extern void *alloc_blob_node(void);
 615extern void *alloc_tree_node(void);
 616extern void *alloc_commit_node(void);
 617extern void *alloc_tag_node(void);
 618extern void *alloc_object_node(void);
 619extern void alloc_report(void);
 620
 621/* trace.c */
 622extern void trace_printf(const char *format, ...);
 623extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 624
 625/* convert.c */
 626/* returns 1 if *dst was used */
 627extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 628extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 629
 630/* diff.c */
 631extern int diff_auto_refresh_index;
 632
 633/* match-trees.c */
 634void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 635
 636#endif /* CACHE_H */