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