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 #define CE_ADDED     (0x80000)
 137
 138 #define CE_HASHED    (0x100000)
 139 #define CE_UNHASHED  (0x200000)
 140
 141 /*
 142  * Copy the sha1 and stat state of a cache entry from one to
 143  * another. But we never change the name, or the hash state!
 144  */
 145 #define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 146 static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 147 {
 148         unsigned int state = dst->ce_flags & CE_STATE_MASK;
 149
 150         /* Don't copy hash chain and name */
 151         memcpy(dst, src, offsetof(struct cache_entry, next));
 152
 153         /* Restore the hash state */
 154         dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 155 }
 156
 157 static inline unsigned create_ce_flags(size_t len, unsigned stage)
 158 {
 159         if (len >= CE_NAMEMASK)
 160                 len = CE_NAMEMASK;
 161         return (len | (stage << CE_STAGESHIFT));
 162 }
 163
 164 static inline size_t ce_namelen(const struct cache_entry *ce)
 165 {
 166         size_t len = ce->ce_flags & CE_NAMEMASK;
 167         if (len < CE_NAMEMASK)
 168                 return len;
 169         return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 170 }
 171
 172 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 173 #define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
 174 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 175 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 176 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 177
 178 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 179 static inline unsigned int create_ce_mode(unsigned int mode)
 180 {
 181         if (S_ISLNK(mode))
 182                 return S_IFLNK;
 183         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 184                 return S_IFGITLINK;
 185         return S_IFREG | ce_permissions(mode);
 186 }
 187 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 188 {
 189         extern int trust_executable_bit, has_symlinks;
 190         if (!has_symlinks && S_ISREG(mode) &&
 191             ce && S_ISLNK(ce->ce_mode))
 192                 return ce->ce_mode;
 193         if (!trust_executable_bit && S_ISREG(mode)) {
 194                 if (ce && S_ISREG(ce->ce_mode))
 195                         return ce->ce_mode;
 196                 return create_ce_mode(0666);
 197         }
 198         return create_ce_mode(mode);
 199 }
 200 static inline int ce_to_dtype(const struct cache_entry *ce)
 201 {
 202         unsigned ce_mode = ntohl(ce->ce_mode);
 203         if (S_ISREG(ce_mode))
 204                 return DT_REG;
 205         else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 206                 return DT_DIR;
 207         else if (S_ISLNK(ce_mode))
 208                 return DT_LNK;
 209         else
 210                 return DT_UNKNOWN;
 211 }
 212 #define canon_mode(mode) \
 213         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 214         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 215
 216 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 217 #define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
 218
 219 struct index_state {
 220         struct cache_entry **cache;
 221         unsigned int cache_nr, cache_alloc, cache_changed;
 222         struct cache_tree *cache_tree;
 223         time_t timestamp;
 224         void *alloc;
 225         unsigned name_hash_initialized : 1;
 226         struct hash_table name_hash;
 227 };
 228
 229 extern struct index_state the_index;
 230
 231 /* Name hashing */
 232 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 233 /*
 234  * We don't actually *remove* it, we can just mark it invalid so that
 235  * we won't find it in lookups.
 236  *
 237  * Not only would we have to search the lists (simple enough), but
 238  * we'd also have to rehash other hash buckets in case this makes the
 239  * hash bucket empty (common). So it's much better to just mark
 240  * it.
 241  */
 242 static inline void remove_name_hash(struct cache_entry *ce)
 243 {
 244         ce->ce_flags |= CE_UNHASHED;
 245 }
 246
 247
 248 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 249 #define active_cache (the_index.cache)
 250 #define active_nr (the_index.cache_nr)
 251 #define active_alloc (the_index.cache_alloc)
 252 #define active_cache_changed (the_index.cache_changed)
 253 #define active_cache_tree (the_index.cache_tree)
 254
 255 #define read_cache() read_index(&the_index)
 256 #define read_cache_from(path) read_index_from(&the_index, (path))
 257 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 258 #define discard_cache() discard_index(&the_index)
 259 #define unmerged_cache() unmerged_index(&the_index)
 260 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 261 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 262 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 263 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 264 #define add_to_cache(path, st, verbose) add_to_index(&the_index, (path), (st), (verbose))
 265 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 266 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 267 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 268 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 269 #define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 270 #endif
 271
 272 enum object_type {
 273         OBJ_BAD = -1,
 274         OBJ_NONE = 0,
 275         OBJ_COMMIT = 1,
 276         OBJ_TREE = 2,
 277         OBJ_BLOB = 3,
 278         OBJ_TAG = 4,
 279         /* 5 for future expansion */
 280         OBJ_OFS_DELTA = 6,
 281         OBJ_REF_DELTA = 7,
 282         OBJ_ANY,
 283         OBJ_MAX,
 284 };
 285
 286 static inline enum object_type object_type(unsigned int mode)
 287 {
 288         return S_ISDIR(mode) ? OBJ_TREE :
 289                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 290                 OBJ_BLOB;
 291 }
 292
 293 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 294 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 295 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 296 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 297 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 298 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 299 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 300 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 301 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 302 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 303 #define GITATTRIBUTES_FILE ".gitattributes"
 304 #define INFOATTRIBUTES_FILE "info/attributes"
 305 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 306
 307 extern int is_bare_repository_cfg;
 308 extern int is_bare_repository(void);
 309 extern int is_inside_git_dir(void);
 310 extern char *git_work_tree_cfg;
 311 extern int is_inside_work_tree(void);
 312 extern const char *get_git_dir(void);
 313 extern char *get_object_directory(void);
 314 extern char *get_refs_directory(void);
 315 extern char *get_index_file(void);
 316 extern char *get_graft_file(void);
 317 extern int set_git_dir(const char *path);
 318 extern const char *get_git_work_tree(void);
 319 extern const char *read_gitfile_gently(const char *path);
 320
 321 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 322
 323 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 324 extern void setup_work_tree(void);
 325 extern const char *setup_git_directory_gently(int *);
 326 extern const char *setup_git_directory(void);
 327 extern const char *prefix_path(const char *prefix, int len, const char *path);
 328 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 329 extern void verify_filename(const char *prefix, const char *name);
 330 extern void verify_non_filename(const char *prefix, const char *name);
 331
 332 #define alloc_nr(x) (((x)+16)*3/2)
 333
 334 /*
 335  * Realloc the buffer pointed at by variable 'x' so that it can hold
 336  * at least 'nr' entries; the number of entries currently allocated
 337  * is 'alloc', using the standard growing factor alloc_nr() macro.
 338  *
 339  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 340  */
 341 #define ALLOC_GROW(x, nr, alloc) \
 342         do { \
 343                 if ((nr) > alloc) { \
 344                         if (alloc_nr(alloc) < (nr)) \
 345                                 alloc = (nr); \
 346                         else \
 347                                 alloc = alloc_nr(alloc); \
 348                         x = xrealloc((x), alloc * sizeof(*(x))); \
 349                 } \
 350         } while(0)
 351
 352 /* Initialize and use the cache information */
 353 extern int read_index(struct index_state *);
 354 extern int read_index_from(struct index_state *, const char *path);
 355 extern int write_index(const struct index_state *, int newfd);
 356 extern int discard_index(struct index_state *);
 357 extern int unmerged_index(const struct index_state *);
 358 extern int verify_path(const char *path);
 359 extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 360 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 361 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 362 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 363 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 364 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 365 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 366 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 367 extern int remove_index_entry_at(struct index_state *, int pos);
 368 extern int remove_file_from_index(struct index_state *, const char *path);
 369 extern int add_to_index(struct index_state *, const char *path, struct stat *, int verbose);
 370 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 371 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 372 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 373
 374 /* do stat comparison even if CE_VALID is true */
 375 #define CE_MATCH_IGNORE_VALID           01
 376 /* do not check the contents but report dirty on racily-clean entries */
 377 #define CE_MATCH_RACY_IS_DIRTY  02
 378 extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 379 extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 380
 381 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 382 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 383 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 384 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 385 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 386
 387 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 388 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 389 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 390 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 391 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 392
 393 struct lock_file {
 394         struct lock_file *next;
 395         int fd;
 396         pid_t owner;
 397         char on_list;
 398         char filename[PATH_MAX];
 399 };
 400 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 401 extern int commit_lock_file(struct lock_file *);
 402
 403 extern int hold_locked_index(struct lock_file *, int);
 404 extern int commit_locked_index(struct lock_file *);
 405 extern void set_alternate_index_output(const char *);
 406 extern int close_lock_file(struct lock_file *);
 407 extern void rollback_lock_file(struct lock_file *);
 408 extern int delete_ref(const char *, const unsigned char *sha1);
 409
 410 /* Environment bits from configuration mechanism */
 411 extern int trust_executable_bit;
 412 extern int quote_path_fully;
 413 extern int has_symlinks;
 414 extern int ignore_case;
 415 extern int assume_unchanged;
 416 extern int prefer_symlink_refs;
 417 extern int log_all_ref_updates;
 418 extern int warn_ambiguous_refs;
 419 extern int shared_repository;
 420 extern const char *apply_default_whitespace;
 421 extern int zlib_compression_level;
 422 extern int core_compression_level;
 423 extern int core_compression_seen;
 424 extern size_t packed_git_window_size;
 425 extern size_t packed_git_limit;
 426 extern size_t delta_base_cache_limit;
 427 extern int auto_crlf;
 428
 429 enum safe_crlf {
 430         SAFE_CRLF_FALSE = 0,
 431         SAFE_CRLF_FAIL = 1,
 432         SAFE_CRLF_WARN = 2,
 433 };
 434
 435 extern enum safe_crlf safe_crlf;
 436
 437 enum branch_track {
 438         BRANCH_TRACK_NEVER = 0,
 439         BRANCH_TRACK_REMOTE,
 440         BRANCH_TRACK_ALWAYS,
 441         BRANCH_TRACK_EXPLICIT,
 442 };
 443
 444 enum rebase_setup_type {
 445         AUTOREBASE_NEVER = 0,
 446         AUTOREBASE_LOCAL,
 447         AUTOREBASE_REMOTE,
 448         AUTOREBASE_ALWAYS,
 449 };
 450
 451 extern enum branch_track git_branch_track;
 452 extern enum rebase_setup_type autorebase;
 453
 454 #define GIT_REPO_VERSION 0
 455 extern int repository_format_version;
 456 extern int check_repository_format(void);
 457
 458 #define MTIME_CHANGED   0x0001
 459 #define CTIME_CHANGED   0x0002
 460 #define OWNER_CHANGED   0x0004
 461 #define MODE_CHANGED    0x0008
 462 #define INODE_CHANGED   0x0010
 463 #define DATA_CHANGED    0x0020
 464 #define TYPE_CHANGED    0x0040
 465
 466 /* Return a statically allocated filename matching the sha1 signature */
 467 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 468 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 469 extern char *sha1_file_name(const unsigned char *sha1);
 470 extern char *sha1_pack_name(const unsigned char *sha1);
 471 extern char *sha1_pack_index_name(const unsigned char *sha1);
 472 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 473 extern const unsigned char null_sha1[20];
 474 static inline int is_null_sha1(const unsigned char *sha1)
 475 {
 476         return !memcmp(sha1, null_sha1, 20);
 477 }
 478 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 479 {
 480         return memcmp(sha1, sha2, 20);
 481 }
 482 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 483 {
 484         memcpy(sha_dst, sha_src, 20);
 485 }
 486 static inline void hashclr(unsigned char *hash)
 487 {
 488         memset(hash, 0, 20);
 489 }
 490
 491 int git_mkstemp(char *path, size_t n, const char *template);
 492
 493 /*
 494  * NOTE NOTE NOTE!!
 495  *
 496  * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 497  * not be changed. Old repositories have core.sharedrepository written in
 498  * numeric format, and therefore these values are preserved for compatibility
 499  * reasons.
 500  */
 501 enum sharedrepo {
 502         PERM_UMASK          = 0,
 503         OLD_PERM_GROUP      = 1,
 504         OLD_PERM_EVERYBODY  = 2,
 505         PERM_GROUP          = 0660,
 506         PERM_EVERYBODY      = 0664,
 507 };
 508 int git_config_perm(const char *var, const char *value);
 509 int adjust_shared_perm(const char *path);
 510 int safe_create_leading_directories(char *path);
 511 char *enter_repo(char *path, int strict);
 512 static inline int is_absolute_path(const char *path)
 513 {
 514         return path[0] == '/';
 515 }
 516 const char *make_absolute_path(const char *path);
 517
 518 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 519 extern int sha1_object_info(const unsigned char *, unsigned long *);
 520 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 521 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 522 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 523 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 524
 525 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 526
 527 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 528                               size_t bufsize, size_t *bufposn);
 529 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 530 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 531
 532 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 533 extern int has_sha1_file(const unsigned char *sha1);
 534
 535 extern int has_pack_file(const unsigned char *sha1);
 536 extern int has_pack_index(const unsigned char *sha1);
 537
 538 extern const signed char hexval_table[256];
 539 static inline unsigned int hexval(unsigned char c)
 540 {
 541         return hexval_table[c];
 542 }
 543
 544 /* Convert to/from hex/sha1 representation */
 545 #define MINIMUM_ABBREV 4
 546 #define DEFAULT_ABBREV 7
 547
 548 extern int get_sha1(const char *str, unsigned char *sha1);
 549 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 550 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 551 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 552 extern int read_ref(const char *filename, unsigned char *sha1);
 553 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 554 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 555 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 556
 557 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 558 extern const char *ref_rev_parse_rules[];
 559 extern const char *ref_fetch_rules[];
 560
 561 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 562 extern int validate_headref(const char *ref);
 563
 564 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 565 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 566 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 567
 568 extern void *read_object_with_reference(const unsigned char *sha1,
 569                                         const char *required_type,
 570                                         unsigned long *size,
 571                                         unsigned char *sha1_ret);
 572
 573 extern struct object *peel_to_type(const char *name, int namelen,
 574                                    struct object *o, enum object_type);
 575
 576 enum date_mode {
 577         DATE_NORMAL = 0,
 578         DATE_RELATIVE,
 579         DATE_SHORT,
 580         DATE_LOCAL,
 581         DATE_ISO8601,
 582         DATE_RFC2822
 583 };
 584
 585 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 586 int parse_date(const char *date, char *buf, int bufsize);
 587 void datestamp(char *buf, int bufsize);
 588 unsigned long approxidate(const char *);
 589 enum date_mode parse_date_format(const char *format);
 590
 591 #define IDENT_WARN_ON_NO_NAME  1
 592 #define IDENT_ERROR_ON_NO_NAME 2
 593 #define IDENT_NO_DATE          4
 594 extern const char *git_author_info(int);
 595 extern const char *git_committer_info(int);
 596 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 597 extern const char *fmt_name(const char *name, const char *email);
 598
 599 struct checkout {
 600         const char *base_dir;
 601         int base_dir_len;
 602         unsigned force:1,
 603                  quiet:1,
 604                  not_new:1,
 605                  refresh_cache:1;
 606 };
 607
 608 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 609 extern int has_symlink_leading_path(int len, const char *name);
 610
 611 extern struct alternate_object_database {
 612         struct alternate_object_database *next;
 613         char *name;
 614         char base[FLEX_ARRAY]; /* more */
 615 } *alt_odb_list;
 616 extern void prepare_alt_odb(void);
 617
 618 struct pack_window {
 619         struct pack_window *next;
 620         unsigned char *base;
 621         off_t offset;
 622         size_t len;
 623         unsigned int last_used;
 624         unsigned int inuse_cnt;
 625 };
 626
 627 extern struct packed_git {
 628         struct packed_git *next;
 629         struct pack_window *windows;
 630         off_t pack_size;
 631         const void *index_data;
 632         size_t index_size;
 633         uint32_t num_objects;
 634         int index_version;
 635         time_t mtime;
 636         int pack_fd;
 637         int pack_local;
 638         unsigned char sha1[20];
 639         /* something like ".git/objects/pack/xxxxx.pack" */
 640         char pack_name[FLEX_ARRAY]; /* more */
 641 } *packed_git;
 642
 643 struct pack_entry {
 644         off_t offset;
 645         unsigned char sha1[20];
 646         struct packed_git *p;
 647 };
 648
 649 struct ref {
 650         struct ref *next;
 651         unsigned char old_sha1[20];
 652         unsigned char new_sha1[20];
 653         char *symref;
 654         unsigned int force:1,
 655                 merge:1,
 656                 nonfastforward:1,
 657                 deletion:1;
 658         enum {
 659                 REF_STATUS_NONE = 0,
 660                 REF_STATUS_OK,
 661                 REF_STATUS_REJECT_NONFASTFORWARD,
 662                 REF_STATUS_REJECT_NODELETE,
 663                 REF_STATUS_UPTODATE,
 664                 REF_STATUS_REMOTE_REJECT,
 665                 REF_STATUS_EXPECTING_REPORT,
 666         } status;
 667         char *remote_status;
 668         struct ref *peer_ref; /* when renaming */
 669         char name[FLEX_ARRAY]; /* more */
 670 };
 671
 672 #define REF_NORMAL      (1u << 0)
 673 #define REF_HEADS       (1u << 1)
 674 #define REF_TAGS        (1u << 2)
 675
 676 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 677
 678 #define CONNECT_VERBOSE       (1u << 0)
 679 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 680 extern int finish_connect(struct child_process *conn);
 681 extern int path_match(const char *path, int nr, char **match);
 682 extern int get_ack(int fd, unsigned char *result_sha1);
 683 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 684 extern int server_supports(const char *feature);
 685
 686 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 687 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 688                                                 const char *idx_path);
 689
 690 extern void prepare_packed_git(void);
 691 extern void reprepare_packed_git(void);
 692 extern void install_packed_git(struct packed_git *pack);
 693
 694 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 695                                          struct packed_git *packs);
 696
 697 extern void pack_report(void);
 698 extern int open_pack_index(struct packed_git *);
 699 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 700 extern void close_pack_windows(struct packed_git *);
 701 extern void unuse_pack(struct pack_window **);
 702 extern struct packed_git *add_packed_git(const char *, int, int);
 703 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 704 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 705 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 706 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 707 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 708 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 709 extern int matches_pack_name(struct packed_git *p, const char *name);
 710
 711 /* Dumb servers support */
 712 extern int update_server_info(int);
 713
 714 typedef int (*config_fn_t)(const char *, const char *);
 715 extern int git_default_config(const char *, const char *);
 716 extern int git_config_from_file(config_fn_t fn, const char *);
 717 extern int git_config(config_fn_t fn);
 718 extern int git_parse_long(const char *, long *);
 719 extern int git_parse_ulong(const char *, unsigned long *);
 720 extern int git_config_int(const char *, const char *);
 721 extern unsigned long git_config_ulong(const char *, const char *);
 722 extern int git_config_bool_or_int(const char *, const char *, int *);
 723 extern int git_config_bool(const char *, const char *);
 724 extern int git_config_string(const char **, const char *, const char *);
 725 extern int git_config_set(const char *, const char *);
 726 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 727 extern int git_config_rename_section(const char *, const char *);
 728 extern const char *git_etc_gitconfig(void);
 729 extern int check_repository_format_version(const char *var, const char *value);
 730 extern int git_env_bool(const char *, int);
 731 extern int git_config_system(void);
 732 extern int git_config_global(void);
 733 extern int config_error_nonbool(const char *);
 734
 735 #define MAX_GITNAME (1000)
 736 extern char git_default_email[MAX_GITNAME];
 737 extern char git_default_name[MAX_GITNAME];
 738 extern int user_ident_explicitly_given;
 739
 740 extern const char *git_commit_encoding;
 741 extern const char *git_log_output_encoding;
 742
 743 /* IO helper functions */
 744 extern void maybe_flush_or_die(FILE *, const char *);
 745 extern int copy_fd(int ifd, int ofd);
 746 extern int copy_file(const char *dst, const char *src, int mode);
 747 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 748 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
 749 extern void write_or_die(int fd, const void *buf, size_t count);
 750 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 751 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 752
 753 /* pager.c */
 754 extern void setup_pager(void);
 755 extern const char *pager_program;
 756 extern int pager_in_use(void);
 757 extern int pager_use_color;
 758
 759 extern const char *editor_program;
 760 extern const char *excludes_file;
 761
 762 /* base85 */
 763 int decode_85(char *dst, const char *line, int linelen);
 764 void encode_85(char *buf, const unsigned char *data, int bytes);
 765
 766 /* alloc.c */
 767 extern void *alloc_blob_node(void);
 768 extern void *alloc_tree_node(void);
 769 extern void *alloc_commit_node(void);
 770 extern void *alloc_tag_node(void);
 771 extern void *alloc_object_node(void);
 772 extern void alloc_report(void);
 773
 774 /* trace.c */
 775 extern void trace_printf(const char *format, ...);
 776 extern void trace_argv_printf(const char **argv, const char *format, ...);
 777
 778 /* convert.c */
 779 /* returns 1 if *dst was used */
 780 extern int convert_to_git(const char *path, const char *src, size_t len,
 781                           struct strbuf *dst, enum safe_crlf checksafe);
 782 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 783
 784 /* add */
 785 void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 786
 787 /* diff.c */
 788 extern int diff_auto_refresh_index;
 789
 790 /* match-trees.c */
 791 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 792
 793 /*
 794  * whitespace rules.
 795  * used by both diff and apply
 796  */
 797 #define WS_TRAILING_SPACE       01
 798 #define WS_SPACE_BEFORE_TAB     02
 799 #define WS_INDENT_WITH_NON_TAB  04
 800 #define WS_CR_AT_EOL           010
 801 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 802 extern unsigned whitespace_rule_cfg;
 803 extern unsigned whitespace_rule(const char *);
 804 extern unsigned parse_whitespace_rule(const char *);
 805 extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 806     FILE *stream, const char *set,
 807     const char *reset, const char *ws);
 808 extern char *whitespace_error_string(unsigned ws);
 809 extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
 810
 811 /* ls-files */
 812 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 813 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 814 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 815
 816 char *alias_lookup(const char *alias);
 817
 818 #endif /* CACHE_H */