cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5
   6 #include SHA1_HEADER
   7 #include <zlib.h>
   8
   9 #if ZLIB_VERNUM < 0x1200
  10 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  11 #endif
  12
  13 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  14 #define DTYPE(de)       ((de)->d_type)
  15 #else
  16 #undef DT_UNKNOWN
  17 #undef DT_DIR
  18 #undef DT_REG
  19 #undef DT_LNK
  20 #define DT_UNKNOWN      0
  21 #define DT_DIR          1
  22 #define DT_REG          2
  23 #define DT_LNK          3
  24 #define DTYPE(de)       DT_UNKNOWN
  25 #endif
  26
  27 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  28 #define S_IFINVALID     0030000
  29
  30 /*
  31  * A "directory link" is a link to another git directory.
  32  *
  33  * The value 0160000 is not normally a valid mode, and
  34  * also just happens to be S_IFDIR + S_IFLNK
  35  *
  36  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  37  * always having the same values everywhere. We should use
  38  * our internal git values for these things, and then we can
  39  * translate that to the OS-specific value. It just so
  40  * happens that everybody shares the same bit representation
  41  * in the UNIX world (and apparently wider too..)
  42  */
  43 #define S_IFGITLINK     0160000
  44 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  45
  46 /*
  47  * Intensive research over the course of many years has shown that
  48  * port 9418 is totally unused by anything else. Or
  49  *
  50  *      Your search - "port 9418" - did not match any documents.
  51  *
  52  * as www.google.com puts it.
  53  *
  54  * This port has been properly assigned for git use by IANA:
  55  * git (Assigned-9418) [I06-050728-0001].
  56  *
  57  *      git  9418/tcp   git pack transfer service
  58  *      git  9418/udp   git pack transfer service
  59  *
  60  * with Linus Torvalds <torvalds@osdl.org> as the point of
  61  * contact. September 2005.
  62  *
  63  * See http://www.iana.org/assignments/port-numbers
  64  */
  65 #define DEFAULT_GIT_PORT 9418
  66
  67 /*
  68  * Basic data structures for the directory cache
  69  */
  70
  71 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  72 struct cache_header {
  73         unsigned int hdr_signature;
  74         unsigned int hdr_version;
  75         unsigned int hdr_entries;
  76 };
  77
  78 /*
  79  * The "cache_time" is just the low 32 bits of the
  80  * time. It doesn't matter if it overflows - we only
  81  * check it for equality in the 32 bits we save.
  82  */
  83 struct cache_time {
  84         unsigned int sec;
  85         unsigned int nsec;
  86 };
  87
  88 /*
  89  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  90  * Again - this is just a (very strong in practice) heuristic that
  91  * the inode hasn't changed.
  92  *
  93  * We save the fields in big-endian order to allow using the
  94  * index file over NFS transparently.
  95  */
  96 struct cache_entry {
  97         struct cache_time ce_ctime;
  98         struct cache_time ce_mtime;
  99         unsigned int ce_dev;
 100         unsigned int ce_ino;
 101         unsigned int ce_mode;
 102         unsigned int ce_uid;
 103         unsigned int ce_gid;
 104         unsigned int ce_size;
 105         unsigned char sha1[20];
 106         unsigned short ce_flags;
 107         char name[FLEX_ARRAY]; /* more */
 108 };
 109
 110 #define CE_NAMEMASK  (0x0fff)
 111 #define CE_STAGEMASK (0x3000)
 112 #define CE_UPDATE    (0x4000)
 113 #define CE_VALID     (0x8000)
 114 #define CE_STAGESHIFT 12
 115
 116 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
 117 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
 118 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 119 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 120
 121 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 122 static inline unsigned int create_ce_mode(unsigned int mode)
 123 {
 124         if (S_ISLNK(mode))
 125                 return htonl(S_IFLNK);
 126         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 127                 return htonl(S_IFGITLINK);
 128         return htonl(S_IFREG | ce_permissions(mode));
 129 }
 130 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 131 {
 132         extern int trust_executable_bit, has_symlinks;
 133         if (!has_symlinks && S_ISREG(mode) &&
 134             ce && S_ISLNK(ntohl(ce->ce_mode)))
 135                 return ce->ce_mode;
 136         if (!trust_executable_bit && S_ISREG(mode)) {
 137                 if (ce && S_ISREG(ntohl(ce->ce_mode)))
 138                         return ce->ce_mode;
 139                 return create_ce_mode(0666);
 140         }
 141         return create_ce_mode(mode);
 142 }
 143 #define canon_mode(mode) \
 144         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 145         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 146
 147 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 148
 149 struct index_state {
 150         struct cache_entry **cache;
 151         unsigned int cache_nr, cache_alloc, cache_changed;
 152         struct cache_tree *cache_tree;
 153         time_t timestamp;
 154         void *mmap;
 155         size_t mmap_size;
 156 };
 157
 158 extern struct index_state the_index;
 159
 160 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 161 #define active_cache (the_index.cache)
 162 #define active_nr (the_index.cache_nr)
 163 #define active_alloc (the_index.cache_alloc)
 164 #define active_cache_changed (the_index.cache_changed)
 165 #define active_cache_tree (the_index.cache_tree)
 166
 167 #define read_cache() read_index(&the_index)
 168 #define read_cache_from(path) read_index_from(&the_index, (path))
 169 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 170 #define discard_cache() discard_index(&the_index)
 171 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 172 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 173 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 174 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 175 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 176 #define refresh_cache(flags) refresh_index(&the_index, flags)
 177 #define ce_match_stat(ce, st, really) ie_match_stat(&the_index, (ce), (st), (really))
 178 #define ce_modified(ce, st, really) ie_modified(&the_index, (ce), (st), (really))
 179 #endif
 180
 181 enum object_type {
 182         OBJ_BAD = -1,
 183         OBJ_NONE = 0,
 184         OBJ_COMMIT = 1,
 185         OBJ_TREE = 2,
 186         OBJ_BLOB = 3,
 187         OBJ_TAG = 4,
 188         /* 5 for future expansion */
 189         OBJ_OFS_DELTA = 6,
 190         OBJ_REF_DELTA = 7,
 191         OBJ_MAX,
 192 };
 193
 194 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 195 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 196 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 197 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 198 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 199 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 200 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 201 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 202 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 203 #define GITATTRIBUTES_FILE ".gitattributes"
 204 #define INFOATTRIBUTES_FILE "info/attributes"
 205 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 206
 207 extern int is_bare_repository_cfg;
 208 extern int is_bare_repository(void);
 209 extern int is_inside_git_dir(void);
 210 extern const char *get_git_dir(void);
 211 extern char *get_object_directory(void);
 212 extern char *get_refs_directory(void);
 213 extern char *get_index_file(void);
 214 extern char *get_graft_file(void);
 215
 216 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 217
 218 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 219 extern const char *setup_git_directory_gently(int *);
 220 extern const char *setup_git_directory(void);
 221 extern const char *prefix_path(const char *prefix, int len, const char *path);
 222 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 223 extern void verify_filename(const char *prefix, const char *name);
 224 extern void verify_non_filename(const char *prefix, const char *name);
 225
 226 #define alloc_nr(x) (((x)+16)*3/2)
 227
 228 /*
 229  * Realloc the buffer pointed at by variable 'x' so that it can hold
 230  * at least 'nr' entries; the number of entries currently allocated
 231  * is 'alloc', using the standard growing factor alloc_nr() macro.
 232  *
 233  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 234  */
 235 #define ALLOC_GROW(x, nr, alloc) \
 236         do { \
 237                 if ((nr) > alloc) { \
 238                         if (alloc_nr(alloc) < (nr)) \
 239                                 alloc = (nr); \
 240                         else \
 241                                 alloc = alloc_nr(alloc); \
 242                         x = xrealloc((x), alloc * sizeof(*(x))); \
 243                 } \
 244         } while(0)
 245
 246 /* Initialize and use the cache information */
 247 extern int read_index(struct index_state *);
 248 extern int read_index_from(struct index_state *, const char *path);
 249 extern int write_index(struct index_state *, int newfd);
 250 extern int discard_index(struct index_state *);
 251 extern int verify_path(const char *path);
 252 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 253 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 254 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 255 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 256 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 257 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 258 extern int remove_index_entry_at(struct index_state *, int pos);
 259 extern int remove_file_from_index(struct index_state *, const char *path);
 260 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 261 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 262 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int);
 263 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int);
 264 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 265 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 266 extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 267 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 268 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 269 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 270
 271 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 272 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 273 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 274 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 275 extern int refresh_index(struct index_state *, unsigned int flags);
 276
 277 struct lock_file {
 278         struct lock_file *next;
 279         pid_t owner;
 280         char on_list;
 281         char filename[PATH_MAX];
 282 };
 283 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 284 extern int commit_lock_file(struct lock_file *);
 285
 286 extern int hold_locked_index(struct lock_file *, int);
 287 extern int commit_locked_index(struct lock_file *);
 288 extern void set_alternate_index_output(const char *);
 289
 290 extern void rollback_lock_file(struct lock_file *);
 291 extern int delete_ref(const char *, const unsigned char *sha1);
 292
 293 /* Environment bits from configuration mechanism */
 294 extern int trust_executable_bit;
 295 extern int has_symlinks;
 296 extern int assume_unchanged;
 297 extern int prefer_symlink_refs;
 298 extern int log_all_ref_updates;
 299 extern int warn_ambiguous_refs;
 300 extern int shared_repository;
 301 extern const char *apply_default_whitespace;
 302 extern int zlib_compression_level;
 303 extern int core_compression_level;
 304 extern int core_compression_seen;
 305 extern size_t packed_git_window_size;
 306 extern size_t packed_git_limit;
 307 extern size_t delta_base_cache_limit;
 308 extern int auto_crlf;
 309
 310 #define GIT_REPO_VERSION 0
 311 extern int repository_format_version;
 312 extern int check_repository_format(void);
 313
 314 #define MTIME_CHANGED   0x0001
 315 #define CTIME_CHANGED   0x0002
 316 #define OWNER_CHANGED   0x0004
 317 #define MODE_CHANGED    0x0008
 318 #define INODE_CHANGED   0x0010
 319 #define DATA_CHANGED    0x0020
 320 #define TYPE_CHANGED    0x0040
 321
 322 /* Return a statically allocated filename matching the sha1 signature */
 323 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 324 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 325 extern char *sha1_file_name(const unsigned char *sha1);
 326 extern char *sha1_pack_name(const unsigned char *sha1);
 327 extern char *sha1_pack_index_name(const unsigned char *sha1);
 328 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 329 extern const unsigned char null_sha1[20];
 330 static inline int is_null_sha1(const unsigned char *sha1)
 331 {
 332         return !memcmp(sha1, null_sha1, 20);
 333 }
 334 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 335 {
 336         return memcmp(sha1, sha2, 20);
 337 }
 338 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 339 {
 340         memcpy(sha_dst, sha_src, 20);
 341 }
 342 static inline void hashclr(unsigned char *hash)
 343 {
 344         memset(hash, 0, 20);
 345 }
 346
 347 int git_mkstemp(char *path, size_t n, const char *template);
 348
 349 enum sharedrepo {
 350         PERM_UMASK = 0,
 351         PERM_GROUP,
 352         PERM_EVERYBODY
 353 };
 354 int git_config_perm(const char *var, const char *value);
 355 int adjust_shared_perm(const char *path);
 356 int safe_create_leading_directories(char *path);
 357 char *enter_repo(char *path, int strict);
 358
 359 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 360 extern int sha1_object_info(const unsigned char *, unsigned long *);
 361 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 362 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 363 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 364 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 365
 366 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 367
 368 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 369                               size_t bufsize, size_t *bufposn);
 370 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 371 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 372
 373 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 374 extern int has_sha1_file(const unsigned char *sha1);
 375
 376 extern int has_pack_file(const unsigned char *sha1);
 377 extern int has_pack_index(const unsigned char *sha1);
 378
 379 extern const signed char hexval_table[256];
 380 static inline unsigned int hexval(unsigned char c)
 381 {
 382         return hexval_table[c];
 383 }
 384
 385 /* Convert to/from hex/sha1 representation */
 386 #define MINIMUM_ABBREV 4
 387 #define DEFAULT_ABBREV 7
 388
 389 extern int get_sha1(const char *str, unsigned char *sha1);
 390 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 391 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 392 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 393 extern int read_ref(const char *filename, unsigned char *sha1);
 394 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 395 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 396 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 397
 398 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 399 extern int validate_headref(const char *ref);
 400
 401 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 402 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 403
 404 extern void *read_object_with_reference(const unsigned char *sha1,
 405                                         const char *required_type,
 406                                         unsigned long *size,
 407                                         unsigned char *sha1_ret);
 408
 409 enum date_mode { DATE_NORMAL = 0, DATE_RELATIVE, DATE_SHORT, DATE_LOCAL };
 410 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 411 const char *show_rfc2822_date(unsigned long time, int timezone);
 412 int parse_date(const char *date, char *buf, int bufsize);
 413 void datestamp(char *buf, int bufsize);
 414 unsigned long approxidate(const char *);
 415
 416 extern const char *git_author_info(int);
 417 extern const char *git_committer_info(int);
 418 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 419
 420 struct checkout {
 421         const char *base_dir;
 422         int base_dir_len;
 423         unsigned force:1,
 424                  quiet:1,
 425                  not_new:1,
 426                  refresh_cache:1;
 427 };
 428
 429 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 430 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 431
 432 extern struct alternate_object_database {
 433         struct alternate_object_database *next;
 434         char *name;
 435         char base[FLEX_ARRAY]; /* more */
 436 } *alt_odb_list;
 437 extern void prepare_alt_odb(void);
 438
 439 struct pack_window {
 440         struct pack_window *next;
 441         unsigned char *base;
 442         off_t offset;
 443         size_t len;
 444         unsigned int last_used;
 445         unsigned int inuse_cnt;
 446 };
 447
 448 extern struct packed_git {
 449         struct packed_git *next;
 450         struct pack_window *windows;
 451         off_t pack_size;
 452         const void *index_data;
 453         size_t index_size;
 454         uint32_t num_objects;
 455         int index_version;
 456         time_t mtime;
 457         int pack_fd;
 458         int pack_local;
 459         unsigned char sha1[20];
 460         /* something like ".git/objects/pack/xxxxx.pack" */
 461         char pack_name[FLEX_ARRAY]; /* more */
 462 } *packed_git;
 463
 464 struct pack_entry {
 465         off_t offset;
 466         unsigned char sha1[20];
 467         struct packed_git *p;
 468 };
 469
 470 struct ref {
 471         struct ref *next;
 472         unsigned char old_sha1[20];
 473         unsigned char new_sha1[20];
 474         unsigned char force;
 475         struct ref *peer_ref; /* when renaming */
 476         char name[FLEX_ARRAY]; /* more */
 477 };
 478
 479 #define REF_NORMAL      (1u << 0)
 480 #define REF_HEADS       (1u << 1)
 481 #define REF_TAGS        (1u << 2)
 482
 483 #define CONNECT_VERBOSE       (1u << 0)
 484 extern pid_t git_connect(int fd[2], char *url, const char *prog, int flags);
 485 extern int finish_connect(pid_t pid);
 486 extern int path_match(const char *path, int nr, char **match);
 487 extern int get_ack(int fd, unsigned char *result_sha1);
 488 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 489 extern int server_supports(const char *feature);
 490
 491 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 492 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 493                                                 const char *idx_path);
 494
 495 extern void prepare_packed_git(void);
 496 extern void reprepare_packed_git(void);
 497 extern void install_packed_git(struct packed_git *pack);
 498
 499 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 500                                          struct packed_git *packs);
 501
 502 extern void pack_report(void);
 503 extern int open_pack_index(struct packed_git *);
 504 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 505 extern void unuse_pack(struct pack_window **);
 506 extern struct packed_git *add_packed_git(const char *, int, int);
 507 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 508 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 509 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 510 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 511 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 512 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 513
 514 /* Dumb servers support */
 515 extern int update_server_info(int);
 516
 517 typedef int (*config_fn_t)(const char *, const char *);
 518 extern int git_default_config(const char *, const char *);
 519 extern int git_config_from_file(config_fn_t fn, const char *);
 520 extern int git_config(config_fn_t fn);
 521 extern int git_config_int(const char *, const char *);
 522 extern int git_config_bool(const char *, const char *);
 523 extern int git_config_set(const char *, const char *);
 524 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 525 extern int git_config_rename_section(const char *, const char *);
 526 extern int check_repository_format_version(const char *var, const char *value);
 527
 528 #define MAX_GITNAME (1000)
 529 extern char git_default_email[MAX_GITNAME];
 530 extern char git_default_name[MAX_GITNAME];
 531
 532 extern const char *git_commit_encoding;
 533 extern const char *git_log_output_encoding;
 534
 535 /* IO helper functions */
 536 extern void maybe_flush_or_die(FILE *, const char *);
 537 extern int copy_fd(int ifd, int ofd);
 538 extern int read_in_full(int fd, void *buf, size_t count);
 539 extern int write_in_full(int fd, const void *buf, size_t count);
 540 extern void write_or_die(int fd, const void *buf, size_t count);
 541 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 542 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 543
 544 /* pager.c */
 545 extern void setup_pager(void);
 546 extern int pager_in_use;
 547 extern int pager_use_color;
 548
 549 /* base85 */
 550 int decode_85(char *dst, const char *line, int linelen);
 551 void encode_85(char *buf, const unsigned char *data, int bytes);
 552
 553 /* alloc.c */
 554 extern void *alloc_blob_node(void);
 555 extern void *alloc_tree_node(void);
 556 extern void *alloc_commit_node(void);
 557 extern void *alloc_tag_node(void);
 558 extern void *alloc_object_node(void);
 559 extern void alloc_report(void);
 560
 561 /* trace.c */
 562 extern int nfasprintf(char **str, const char *fmt, ...);
 563 extern int nfvasprintf(char **str, const char *fmt, va_list va);
 564 extern void trace_printf(const char *format, ...);
 565 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 566
 567 /* convert.c */
 568 extern char *convert_to_git(const char *path, const char *src, unsigned long *sizep);
 569 extern char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep);
 570 extern void *convert_sha1_file(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size);
 571
 572 /* match-trees.c */
 573 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 574
 575 #endif /* CACHE_H */