cache.h

   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" */
  74 struct 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  */
  85 struct 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  */
  98 struct 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
 112 struct cache_entry {
 113         unsigned int ce_ctime;
 114         unsigned int ce_mtime;
 115         unsigned int ce_dev;
 116         unsigned int ce_ino;
 117         unsigned int ce_mode;
 118         unsigned int ce_uid;
 119         unsigned int ce_gid;
 120         unsigned int ce_size;
 121         unsigned int ce_flags;
 122         unsigned char sha1[20];
 123         struct cache_entry *next;
 124         char name[FLEX_ARRAY]; /* more */
 125 };
 126
 127 #define CE_NAMEMASK  (0x0fff)
 128 #define CE_STAGEMASK (0x3000)
 129 #define CE_VALID     (0x8000)
 130 #define CE_STAGESHIFT 12
 131
 132 /* In-memory only */
 133 #define CE_UPDATE    (0x10000)
 134 #define CE_REMOVE    (0x20000)
 135 #define CE_UPTODATE  (0x40000)
 136
 137 #define CE_HASHED    (0x100000)
 138 #define CE_UNHASHED  (0x200000)
 139
 140 /*
 141  * Copy the sha1 and stat state of a cache entry from one to
 142  * another. But we never change the name, or the hash state!
 143  */
 144 #define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 145 static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 146 {
 147         unsigned int state = dst->ce_flags & CE_STATE_MASK;
 148
 149         /* Don't copy hash chain and name */
 150         memcpy(dst, src, offsetof(struct cache_entry, next));
 151
 152         /* Restore the hash state */
 153         dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 154 }
 155
 156 /*
 157  * We don't actually *remove* it, we can just mark it invalid so that
 158  * we won't find it in lookups.
 159  *
 160  * Not only would we have to search the lists (simple enough), but
 161  * we'd also have to rehash other hash buckets in case this makes the
 162  * hash bucket empty (common). So it's much better to just mark
 163  * it.
 164  */
 165 static inline void remove_index_entry(struct cache_entry *ce)
 166 {
 167         ce->ce_flags |= CE_UNHASHED;
 168 }
 169
 170 static inline unsigned create_ce_flags(size_t len, unsigned stage)
 171 {
 172         if (len >= CE_NAMEMASK)
 173                 len = CE_NAMEMASK;
 174         return (len | (stage << CE_STAGESHIFT));
 175 }
 176
 177 static inline size_t ce_namelen(const struct cache_entry *ce)
 178 {
 179         size_t len = ce->ce_flags & CE_NAMEMASK;
 180         if (len < CE_NAMEMASK)
 181                 return len;
 182         return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 183 }
 184
 185 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 186 #define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
 187 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 188 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 189 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 190
 191 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 192 static inline unsigned int create_ce_mode(unsigned int mode)
 193 {
 194         if (S_ISLNK(mode))
 195                 return S_IFLNK;
 196         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 197                 return S_IFGITLINK;
 198         return S_IFREG | ce_permissions(mode);
 199 }
 200 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 201 {
 202         extern int trust_executable_bit, has_symlinks;
 203         if (!has_symlinks && S_ISREG(mode) &&
 204             ce && S_ISLNK(ce->ce_mode))
 205                 return ce->ce_mode;
 206         if (!trust_executable_bit && S_ISREG(mode)) {
 207                 if (ce && S_ISREG(ce->ce_mode))
 208                         return ce->ce_mode;
 209                 return create_ce_mode(0666);
 210         }
 211         return create_ce_mode(mode);
 212 }
 213 static inline int ce_to_dtype(const struct cache_entry *ce)
 214 {
 215         unsigned ce_mode = ntohl(ce->ce_mode);
 216         if (S_ISREG(ce_mode))
 217                 return DT_REG;
 218         else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 219                 return DT_DIR;
 220         else if (S_ISLNK(ce_mode))
 221                 return DT_LNK;
 222         else
 223                 return DT_UNKNOWN;
 224 }
 225 #define canon_mode(mode) \
 226         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 227         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 228
 229 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 230 #define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
 231
 232 struct index_state {
 233         struct cache_entry **cache;
 234         unsigned int cache_nr, cache_alloc, cache_changed;
 235         struct cache_tree *cache_tree;
 236         time_t timestamp;
 237         void *alloc;
 238         unsigned name_hash_initialized : 1;
 239         struct hash_table name_hash;
 240 };
 241
 242 extern struct index_state the_index;
 243
 244 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 245 #define active_cache (the_index.cache)
 246 #define active_nr (the_index.cache_nr)
 247 #define active_alloc (the_index.cache_alloc)
 248 #define active_cache_changed (the_index.cache_changed)
 249 #define active_cache_tree (the_index.cache_tree)
 250
 251 #define read_cache() read_index(&the_index)
 252 #define read_cache_from(path) read_index_from(&the_index, (path))
 253 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 254 #define discard_cache() discard_index(&the_index)
 255 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 256 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 257 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 258 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 259 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 260 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 261 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 262 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 263 #define cache_name_exists(name, namelen) index_name_exists(&the_index, (name), (namelen))
 264 #endif
 265
 266 enum object_type {
 267         OBJ_BAD = -1,
 268         OBJ_NONE = 0,
 269         OBJ_COMMIT = 1,
 270         OBJ_TREE = 2,
 271         OBJ_BLOB = 3,
 272         OBJ_TAG = 4,
 273         /* 5 for future expansion */
 274         OBJ_OFS_DELTA = 6,
 275         OBJ_REF_DELTA = 7,
 276         OBJ_MAX,
 277 };
 278
 279 static inline enum object_type object_type(unsigned int mode)
 280 {
 281         return S_ISDIR(mode) ? OBJ_TREE :
 282                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 283                 OBJ_BLOB;
 284 }
 285
 286 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 287 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 288 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 289 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 290 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 291 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 292 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 293 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 294 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 295 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 296 #define GITATTRIBUTES_FILE ".gitattributes"
 297 #define INFOATTRIBUTES_FILE "info/attributes"
 298 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 299
 300 extern int is_bare_repository_cfg;
 301 extern int is_bare_repository(void);
 302 extern int is_inside_git_dir(void);
 303 extern char *git_work_tree_cfg;
 304 extern int is_inside_work_tree(void);
 305 extern const char *get_git_dir(void);
 306 extern char *get_object_directory(void);
 307 extern char *get_refs_directory(void);
 308 extern char *get_index_file(void);
 309 extern char *get_graft_file(void);
 310 extern int set_git_dir(const char *path);
 311 extern const char *get_git_work_tree(void);
 312
 313 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 314
 315 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 316 extern void setup_work_tree(void);
 317 extern const char *setup_git_directory_gently(int *);
 318 extern const char *setup_git_directory(void);
 319 extern const char *prefix_path(const char *prefix, int len, const char *path);
 320 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 321 extern void verify_filename(const char *prefix, const char *name);
 322 extern void verify_non_filename(const char *prefix, const char *name);
 323
 324 #define alloc_nr(x) (((x)+16)*3/2)
 325
 326 /*
 327  * Realloc the buffer pointed at by variable 'x' so that it can hold
 328  * at least 'nr' entries; the number of entries currently allocated
 329  * is 'alloc', using the standard growing factor alloc_nr() macro.
 330  *
 331  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 332  */
 333 #define ALLOC_GROW(x, nr, alloc) \
 334         do { \
 335                 if ((nr) > alloc) { \
 336                         if (alloc_nr(alloc) < (nr)) \
 337                                 alloc = (nr); \
 338                         else \
 339                                 alloc = alloc_nr(alloc); \
 340                         x = xrealloc((x), alloc * sizeof(*(x))); \
 341                 } \
 342         } while(0)
 343
 344 /* Initialize and use the cache information */
 345 extern int read_index(struct index_state *);
 346 extern int read_index_from(struct index_state *, const char *path);
 347 extern int write_index(struct index_state *, int newfd);
 348 extern int discard_index(struct index_state *);
 349 extern int verify_path(const char *path);
 350 extern int index_name_exists(struct index_state *istate, const char *name, int namelen);
 351 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 352 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 353 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 354 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 355 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 356 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 357 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 358 extern int remove_index_entry_at(struct index_state *, int pos);
 359 extern int remove_file_from_index(struct index_state *, const char *path);
 360 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 361 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 362 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 363
 364 /* do stat comparison even if CE_VALID is true */
 365 #define CE_MATCH_IGNORE_VALID           01
 366 /* do not check the contents but report dirty on racily-clean entries */
 367 #define CE_MATCH_RACY_IS_DIRTY  02
 368 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 369 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 370
 371 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 372 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 373 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 374 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 375 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 376
 377 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 378 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 379 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 380 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 381 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 382
 383 struct lock_file {
 384         struct lock_file *next;
 385         int fd;
 386         pid_t owner;
 387         char on_list;
 388         char filename[PATH_MAX];
 389 };
 390 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 391 extern int commit_lock_file(struct lock_file *);
 392
 393 extern int hold_locked_index(struct lock_file *, int);
 394 extern int commit_locked_index(struct lock_file *);
 395 extern void set_alternate_index_output(const char *);
 396 extern int close_lock_file(struct lock_file *);
 397 extern void rollback_lock_file(struct lock_file *);
 398 extern int delete_ref(const char *, const unsigned char *sha1);
 399
 400 /* Environment bits from configuration mechanism */
 401 extern int trust_executable_bit;
 402 extern int quote_path_fully;
 403 extern int has_symlinks;
 404 extern int assume_unchanged;
 405 extern int prefer_symlink_refs;
 406 extern int log_all_ref_updates;
 407 extern int warn_ambiguous_refs;
 408 extern int shared_repository;
 409 extern const char *apply_default_whitespace;
 410 extern int zlib_compression_level;
 411 extern int core_compression_level;
 412 extern int core_compression_seen;
 413 extern size_t packed_git_window_size;
 414 extern size_t packed_git_limit;
 415 extern size_t delta_base_cache_limit;
 416 extern int auto_crlf;
 417
 418 enum safe_crlf {
 419         SAFE_CRLF_FALSE = 0,
 420         SAFE_CRLF_FAIL = 1,
 421         SAFE_CRLF_WARN = 2,
 422 };
 423
 424 extern enum safe_crlf safe_crlf;
 425
 426 #define GIT_REPO_VERSION 0
 427 extern int repository_format_version;
 428 extern int check_repository_format(void);
 429
 430 #define MTIME_CHANGED   0x0001
 431 #define CTIME_CHANGED   0x0002
 432 #define OWNER_CHANGED   0x0004
 433 #define MODE_CHANGED    0x0008
 434 #define INODE_CHANGED   0x0010
 435 #define DATA_CHANGED    0x0020
 436 #define TYPE_CHANGED    0x0040
 437
 438 /* Return a statically allocated filename matching the sha1 signature */
 439 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 440 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 441 extern char *sha1_file_name(const unsigned char *sha1);
 442 extern char *sha1_pack_name(const unsigned char *sha1);
 443 extern char *sha1_pack_index_name(const unsigned char *sha1);
 444 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 445 extern const unsigned char null_sha1[20];
 446 static inline int is_null_sha1(const unsigned char *sha1)
 447 {
 448         return !memcmp(sha1, null_sha1, 20);
 449 }
 450 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 451 {
 452         return memcmp(sha1, sha2, 20);
 453 }
 454 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 455 {
 456         memcpy(sha_dst, sha_src, 20);
 457 }
 458 static inline void hashclr(unsigned char *hash)
 459 {
 460         memset(hash, 0, 20);
 461 }
 462
 463 int git_mkstemp(char *path, size_t n, const char *template);
 464
 465 enum sharedrepo {
 466         PERM_UMASK = 0,
 467         PERM_GROUP,
 468         PERM_EVERYBODY
 469 };
 470 int git_config_perm(const char *var, const char *value);
 471 int adjust_shared_perm(const char *path);
 472 int safe_create_leading_directories(char *path);
 473 char *enter_repo(char *path, int strict);
 474 static inline int is_absolute_path(const char *path)
 475 {
 476         return path[0] == '/';
 477 }
 478 const char *make_absolute_path(const char *path);
 479
 480 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 481 extern int sha1_object_info(const unsigned char *, unsigned long *);
 482 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 483 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 484 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 485 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 486
 487 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 488
 489 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 490                               size_t bufsize, size_t *bufposn);
 491 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 492 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 493
 494 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 495 extern int has_sha1_file(const unsigned char *sha1);
 496
 497 extern int has_pack_file(const unsigned char *sha1);
 498 extern int has_pack_index(const unsigned char *sha1);
 499
 500 extern const signed char hexval_table[256];
 501 static inline unsigned int hexval(unsigned char c)
 502 {
 503         return hexval_table[c];
 504 }
 505
 506 /* Convert to/from hex/sha1 representation */
 507 #define MINIMUM_ABBREV 4
 508 #define DEFAULT_ABBREV 7
 509
 510 extern int get_sha1(const char *str, unsigned char *sha1);
 511 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 512 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 513 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 514 extern int read_ref(const char *filename, unsigned char *sha1);
 515 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 516 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 517 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 518
 519 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 520 extern const char *ref_rev_parse_rules[];
 521 extern const char *ref_fetch_rules[];
 522
 523 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 524 extern int validate_headref(const char *ref);
 525
 526 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 527 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 528
 529 extern void *read_object_with_reference(const unsigned char *sha1,
 530                                         const char *required_type,
 531                                         unsigned long *size,
 532                                         unsigned char *sha1_ret);
 533
 534 enum date_mode {
 535         DATE_NORMAL = 0,
 536         DATE_RELATIVE,
 537         DATE_SHORT,
 538         DATE_LOCAL,
 539         DATE_ISO8601,
 540         DATE_RFC2822
 541 };
 542
 543 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 544 int parse_date(const char *date, char *buf, int bufsize);
 545 void datestamp(char *buf, int bufsize);
 546 unsigned long approxidate(const char *);
 547 enum date_mode parse_date_format(const char *format);
 548
 549 #define IDENT_WARN_ON_NO_NAME  1
 550 #define IDENT_ERROR_ON_NO_NAME 2
 551 #define IDENT_NO_DATE          4
 552 extern const char *git_author_info(int);
 553 extern const char *git_committer_info(int);
 554 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 555 extern const char *fmt_name(const char *name, const char *email);
 556
 557 struct checkout {
 558         const char *base_dir;
 559         int base_dir_len;
 560         unsigned force:1,
 561                  quiet:1,
 562                  not_new:1,
 563                  refresh_cache:1;
 564 };
 565
 566 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 567 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 568
 569 extern struct alternate_object_database {
 570         struct alternate_object_database *next;
 571         char *name;
 572         char base[FLEX_ARRAY]; /* more */
 573 } *alt_odb_list;
 574 extern void prepare_alt_odb(void);
 575
 576 struct pack_window {
 577         struct pack_window *next;
 578         unsigned char *base;
 579         off_t offset;
 580         size_t len;
 581         unsigned int last_used;
 582         unsigned int inuse_cnt;
 583 };
 584
 585 extern struct packed_git {
 586         struct packed_git *next;
 587         struct pack_window *windows;
 588         off_t pack_size;
 589         const void *index_data;
 590         size_t index_size;
 591         uint32_t num_objects;
 592         int index_version;
 593         time_t mtime;
 594         int pack_fd;
 595         int pack_local;
 596         unsigned char sha1[20];
 597         /* something like ".git/objects/pack/xxxxx.pack" */
 598         char pack_name[FLEX_ARRAY]; /* more */
 599 } *packed_git;
 600
 601 struct pack_entry {
 602         off_t offset;
 603         unsigned char sha1[20];
 604         struct packed_git *p;
 605 };
 606
 607 struct ref {
 608         struct ref *next;
 609         unsigned char old_sha1[20];
 610         unsigned char new_sha1[20];
 611         unsigned int force:1,
 612                 merge:1,
 613                 nonfastforward:1,
 614                 deletion:1;
 615         enum {
 616                 REF_STATUS_NONE = 0,
 617                 REF_STATUS_OK,
 618                 REF_STATUS_REJECT_NONFASTFORWARD,
 619                 REF_STATUS_REJECT_NODELETE,
 620                 REF_STATUS_UPTODATE,
 621                 REF_STATUS_REMOTE_REJECT,
 622                 REF_STATUS_EXPECTING_REPORT,
 623         } status;
 624         char *remote_status;
 625         struct ref *peer_ref; /* when renaming */
 626         char name[FLEX_ARRAY]; /* more */
 627 };
 628
 629 #define REF_NORMAL      (1u << 0)
 630 #define REF_HEADS       (1u << 1)
 631 #define REF_TAGS        (1u << 2)
 632
 633 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 634
 635 #define CONNECT_VERBOSE       (1u << 0)
 636 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 637 extern int finish_connect(struct child_process *conn);
 638 extern int path_match(const char *path, int nr, char **match);
 639 extern int get_ack(int fd, unsigned char *result_sha1);
 640 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 641 extern int server_supports(const char *feature);
 642
 643 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 644 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 645                                                 const char *idx_path);
 646
 647 extern void prepare_packed_git(void);
 648 extern void reprepare_packed_git(void);
 649 extern void install_packed_git(struct packed_git *pack);
 650
 651 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 652                                          struct packed_git *packs);
 653
 654 extern void pack_report(void);
 655 extern int open_pack_index(struct packed_git *);
 656 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 657 extern void close_pack_windows(struct packed_git *);
 658 extern void unuse_pack(struct pack_window **);
 659 extern struct packed_git *add_packed_git(const char *, int, int);
 660 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 661 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 662 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 663 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 664 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 665 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 666 extern int matches_pack_name(struct packed_git *p, const char *name);
 667
 668 /* Dumb servers support */
 669 extern int update_server_info(int);
 670
 671 typedef int (*config_fn_t)(const char *, const char *);
 672 extern int git_default_config(const char *, const char *);
 673 extern int git_config_from_file(config_fn_t fn, const char *);
 674 extern int git_config(config_fn_t fn);
 675 extern int git_parse_long(const char *, long *);
 676 extern int git_parse_ulong(const char *, unsigned long *);
 677 extern int git_config_int(const char *, const char *);
 678 extern unsigned long git_config_ulong(const char *, const char *);
 679 extern int git_config_bool(const char *, const char *);
 680 extern int git_config_string(const char **, const char *, const char *);
 681 extern int git_config_set(const char *, const char *);
 682 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 683 extern int git_config_rename_section(const char *, const char *);
 684 extern const char *git_etc_gitconfig(void);
 685 extern int check_repository_format_version(const char *var, const char *value);
 686 extern int git_env_bool(const char *, int);
 687 extern int git_config_system(void);
 688 extern int git_config_global(void);
 689 extern int config_error_nonbool(const char *);
 690
 691 #define MAX_GITNAME (1000)
 692 extern char git_default_email[MAX_GITNAME];
 693 extern char git_default_name[MAX_GITNAME];
 694
 695 extern const char *git_commit_encoding;
 696 extern const char *git_log_output_encoding;
 697
 698 /* IO helper functions */
 699 extern void maybe_flush_or_die(FILE *, const char *);
 700 extern int copy_fd(int ifd, int ofd);
 701 extern int read_in_full(int fd, void *buf, size_t count);
 702 extern int write_in_full(int fd, const void *buf, size_t count);
 703 extern void write_or_die(int fd, const void *buf, size_t count);
 704 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 705 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 706
 707 /* pager.c */
 708 extern void setup_pager(void);
 709 extern const char *pager_program;
 710 extern int pager_in_use(void);
 711 extern int pager_use_color;
 712
 713 extern const char *editor_program;
 714 extern const char *excludes_file;
 715
 716 /* base85 */
 717 int decode_85(char *dst, const char *line, int linelen);
 718 void encode_85(char *buf, const unsigned char *data, int bytes);
 719
 720 /* alloc.c */
 721 extern void *alloc_blob_node(void);
 722 extern void *alloc_tree_node(void);
 723 extern void *alloc_commit_node(void);
 724 extern void *alloc_tag_node(void);
 725 extern void *alloc_object_node(void);
 726 extern void alloc_report(void);
 727
 728 /* trace.c */
 729 extern void trace_printf(const char *format, ...);
 730 extern void trace_argv_printf(const char **argv, const char *format, ...);
 731
 732 /* convert.c */
 733 /* returns 1 if *dst was used */
 734 extern int convert_to_git(const char *path, const char *src, size_t len,
 735                           struct strbuf *dst, enum safe_crlf checksafe);
 736 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 737
 738 /* add */
 739 void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 740
 741 /* diff.c */
 742 extern int diff_auto_refresh_index;
 743
 744 /* match-trees.c */
 745 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 746
 747 /*
 748  * whitespace rules.
 749  * used by both diff and apply
 750  */
 751 #define WS_TRAILING_SPACE       01
 752 #define WS_SPACE_BEFORE_TAB     02
 753 #define WS_INDENT_WITH_NON_TAB  04
 754 #define WS_CR_AT_EOL           010
 755 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 756 extern unsigned whitespace_rule_cfg;
 757 extern unsigned whitespace_rule(const char *);
 758 extern unsigned parse_whitespace_rule(const char *);
 759 extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 760     FILE *stream, const char *set,
 761     const char *reset, const char *ws);
 762 extern char *whitespace_error_string(unsigned ws);
 763 extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
 764
 765 /* ls-files */
 766 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 767 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 768 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 769
 770 #endif /* CACHE_H */