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 #include "advice.h"
   8
   9 #include SHA1_HEADER
  10 #ifndef git_SHA_CTX
  11 #define git_SHA_CTX     SHA_CTX
  12 #define git_SHA1_Init   SHA1_Init
  13 #define git_SHA1_Update SHA1_Update
  14 #define git_SHA1_Final  SHA1_Final
  15 #endif
  16
  17 #include <zlib.h>
  18 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  19 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  20 #endif
  21
  22 void git_inflate_init(z_streamp strm);
  23 void git_inflate_end(z_streamp strm);
  24 int git_inflate(z_streamp strm, int flush);
  25
  26 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  27 #define DTYPE(de)       ((de)->d_type)
  28 #else
  29 #undef DT_UNKNOWN
  30 #undef DT_DIR
  31 #undef DT_REG
  32 #undef DT_LNK
  33 #define DT_UNKNOWN      0
  34 #define DT_DIR          1
  35 #define DT_REG          2
  36 #define DT_LNK          3
  37 #define DTYPE(de)       DT_UNKNOWN
  38 #endif
  39
  40 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  41 #define S_IFINVALID     0030000
  42
  43 /*
  44  * A "directory link" is a link to another git directory.
  45  *
  46  * The value 0160000 is not normally a valid mode, and
  47  * also just happens to be S_IFDIR + S_IFLNK
  48  *
  49  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  50  * always having the same values everywhere. We should use
  51  * our internal git values for these things, and then we can
  52  * translate that to the OS-specific value. It just so
  53  * happens that everybody shares the same bit representation
  54  * in the UNIX world (and apparently wider too..)
  55  */
  56 #define S_IFGITLINK     0160000
  57 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  58
  59 /*
  60  * Intensive research over the course of many years has shown that
  61  * port 9418 is totally unused by anything else. Or
  62  *
  63  *      Your search - "port 9418" - did not match any documents.
  64  *
  65  * as www.google.com puts it.
  66  *
  67  * This port has been properly assigned for git use by IANA:
  68  * git (Assigned-9418) [I06-050728-0001].
  69  *
  70  *      git  9418/tcp   git pack transfer service
  71  *      git  9418/udp   git pack transfer service
  72  *
  73  * with Linus Torvalds <torvalds@osdl.org> as the point of
  74  * contact. September 2005.
  75  *
  76  * See http://www.iana.org/assignments/port-numbers
  77  */
  78 #define DEFAULT_GIT_PORT 9418
  79
  80 /*
  81  * Basic data structures for the directory cache
  82  */
  83
  84 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  85 struct cache_header {
  86         unsigned int hdr_signature;
  87         unsigned int hdr_version;
  88         unsigned int hdr_entries;
  89 };
  90
  91 /*
  92  * The "cache_time" is just the low 32 bits of the
  93  * time. It doesn't matter if it overflows - we only
  94  * check it for equality in the 32 bits we save.
  95  */
  96 struct cache_time {
  97         unsigned int sec;
  98         unsigned int nsec;
  99 };
 100
 101 /*
 102  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
 103  * Again - this is just a (very strong in practice) heuristic that
 104  * the inode hasn't changed.
 105  *
 106  * We save the fields in big-endian order to allow using the
 107  * index file over NFS transparently.
 108  */
 109 struct ondisk_cache_entry {
 110         struct cache_time ctime;
 111         struct cache_time mtime;
 112         unsigned int dev;
 113         unsigned int ino;
 114         unsigned int mode;
 115         unsigned int uid;
 116         unsigned int gid;
 117         unsigned int size;
 118         unsigned char sha1[20];
 119         unsigned short flags;
 120         char name[FLEX_ARRAY]; /* more */
 121 };
 122
 123 /*
 124  * This struct is used when CE_EXTENDED bit is 1
 125  * The struct must match ondisk_cache_entry exactly from
 126  * ctime till flags
 127  */
 128 struct ondisk_cache_entry_extended {
 129         struct cache_time ctime;
 130         struct cache_time mtime;
 131         unsigned int dev;
 132         unsigned int ino;
 133         unsigned int mode;
 134         unsigned int uid;
 135         unsigned int gid;
 136         unsigned int size;
 137         unsigned char sha1[20];
 138         unsigned short flags;
 139         unsigned short flags2;
 140         char name[FLEX_ARRAY]; /* more */
 141 };
 142
 143 struct cache_entry {
 144         struct cache_time ce_ctime;
 145         struct cache_time ce_mtime;
 146         unsigned int ce_dev;
 147         unsigned int ce_ino;
 148         unsigned int ce_mode;
 149         unsigned int ce_uid;
 150         unsigned int ce_gid;
 151         unsigned int ce_size;
 152         unsigned int ce_flags;
 153         unsigned char sha1[20];
 154         struct cache_entry *next;
 155         char name[FLEX_ARRAY]; /* more */
 156 };
 157
 158 #define CE_NAMEMASK  (0x0fff)
 159 #define CE_STAGEMASK (0x3000)
 160 #define CE_EXTENDED  (0x4000)
 161 #define CE_VALID     (0x8000)
 162 #define CE_STAGESHIFT 12
 163
 164 /*
 165  * Range 0xFFFF0000 in ce_flags is divided into
 166  * two parts: in-memory flags and on-disk ones.
 167  * Flags in CE_EXTENDED_FLAGS will get saved on-disk
 168  * if you want to save a new flag, add it in
 169  * CE_EXTENDED_FLAGS
 170  *
 171  * In-memory only flags
 172  */
 173 #define CE_UPDATE    (0x10000)
 174 #define CE_REMOVE    (0x20000)
 175 #define CE_UPTODATE  (0x40000)
 176 #define CE_ADDED     (0x80000)
 177
 178 #define CE_HASHED    (0x100000)
 179 #define CE_UNHASHED  (0x200000)
 180 #define CE_CONFLICTED (0x800000)
 181
 182 /* Only remove in work directory, not index */
 183 #define CE_WT_REMOVE (0x400000)
 184
 185 #define CE_UNPACKED  (0x1000000)
 186
 187 /*
 188  * Extended on-disk flags
 189  */
 190 #define CE_INTENT_TO_ADD 0x20000000
 191 #define CE_SKIP_WORKTREE 0x40000000
 192 /* CE_EXTENDED2 is for future extension */
 193 #define CE_EXTENDED2 0x80000000
 194
 195 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
 196
 197 /*
 198  * Safeguard to avoid saving wrong flags:
 199  *  - CE_EXTENDED2 won't get saved until its semantic is known
 200  *  - Bits in 0x0000FFFF have been saved in ce_flags already
 201  *  - Bits in 0x003F0000 are currently in-memory flags
 202  */
 203 #if CE_EXTENDED_FLAGS & 0x803FFFFF
 204 #error "CE_EXTENDED_FLAGS out of range"
 205 #endif
 206
 207 /*
 208  * Copy the sha1 and stat state of a cache entry from one to
 209  * another. But we never change the name, or the hash state!
 210  */
 211 #define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 212 static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 213 {
 214         unsigned int state = dst->ce_flags & CE_STATE_MASK;
 215
 216         /* Don't copy hash chain and name */
 217         memcpy(dst, src, offsetof(struct cache_entry, next));
 218
 219         /* Restore the hash state */
 220         dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 221 }
 222
 223 static inline unsigned create_ce_flags(size_t len, unsigned stage)
 224 {
 225         if (len >= CE_NAMEMASK)
 226                 len = CE_NAMEMASK;
 227         return (len | (stage << CE_STAGESHIFT));
 228 }
 229
 230 static inline size_t ce_namelen(const struct cache_entry *ce)
 231 {
 232         size_t len = ce->ce_flags & CE_NAMEMASK;
 233         if (len < CE_NAMEMASK)
 234                 return len;
 235         return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 236 }
 237
 238 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 239 #define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \
 240                             ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
 241                             ondisk_cache_entry_size(ce_namelen(ce)))
 242 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 243 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 244 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
 245 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 246
 247 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 248 static inline unsigned int create_ce_mode(unsigned int mode)
 249 {
 250         if (S_ISLNK(mode))
 251                 return S_IFLNK;
 252         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 253                 return S_IFGITLINK;
 254         return S_IFREG | ce_permissions(mode);
 255 }
 256 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 257 {
 258         extern int trust_executable_bit, has_symlinks;
 259         if (!has_symlinks && S_ISREG(mode) &&
 260             ce && S_ISLNK(ce->ce_mode))
 261                 return ce->ce_mode;
 262         if (!trust_executable_bit && S_ISREG(mode)) {
 263                 if (ce && S_ISREG(ce->ce_mode))
 264                         return ce->ce_mode;
 265                 return create_ce_mode(0666);
 266         }
 267         return create_ce_mode(mode);
 268 }
 269 static inline int ce_to_dtype(const struct cache_entry *ce)
 270 {
 271         unsigned ce_mode = ntohl(ce->ce_mode);
 272         if (S_ISREG(ce_mode))
 273                 return DT_REG;
 274         else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 275                 return DT_DIR;
 276         else if (S_ISLNK(ce_mode))
 277                 return DT_LNK;
 278         else
 279                 return DT_UNKNOWN;
 280 }
 281 #define canon_mode(mode) \
 282         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 283         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 284
 285 #define flexible_size(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
 286 #define cache_entry_size(len) flexible_size(cache_entry,len)
 287 #define ondisk_cache_entry_size(len) flexible_size(ondisk_cache_entry,len)
 288 #define ondisk_cache_entry_extended_size(len) flexible_size(ondisk_cache_entry_extended,len)
 289
 290 struct index_state {
 291         struct cache_entry **cache;
 292         unsigned int cache_nr, cache_alloc, cache_changed;
 293         struct string_list *resolve_undo;
 294         struct cache_tree *cache_tree;
 295         struct cache_time timestamp;
 296         void *alloc;
 297         unsigned name_hash_initialized : 1,
 298                  initialized : 1;
 299         struct hash_table name_hash;
 300 };
 301
 302 extern struct index_state the_index;
 303
 304 /* Name hashing */
 305 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 306 /*
 307  * We don't actually *remove* it, we can just mark it invalid so that
 308  * we won't find it in lookups.
 309  *
 310  * Not only would we have to search the lists (simple enough), but
 311  * we'd also have to rehash other hash buckets in case this makes the
 312  * hash bucket empty (common). So it's much better to just mark
 313  * it.
 314  */
 315 static inline void remove_name_hash(struct cache_entry *ce)
 316 {
 317         ce->ce_flags |= CE_UNHASHED;
 318 }
 319
 320
 321 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 322 #define active_cache (the_index.cache)
 323 #define active_nr (the_index.cache_nr)
 324 #define active_alloc (the_index.cache_alloc)
 325 #define active_cache_changed (the_index.cache_changed)
 326 #define active_cache_tree (the_index.cache_tree)
 327
 328 #define read_cache() read_index(&the_index)
 329 #define read_cache_from(path) read_index_from(&the_index, (path))
 330 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 331 #define is_cache_unborn() is_index_unborn(&the_index)
 332 #define read_cache_unmerged() read_index_unmerged(&the_index)
 333 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 334 #define discard_cache() discard_index(&the_index)
 335 #define unmerged_cache() unmerged_index(&the_index)
 336 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 337 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 338 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 339 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 340 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 341 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 342 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 343 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
 344 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 345 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 346 #define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 347 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 348 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 349 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
 350 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
 351 #endif
 352
 353 enum object_type {
 354         OBJ_BAD = -1,
 355         OBJ_NONE = 0,
 356         OBJ_COMMIT = 1,
 357         OBJ_TREE = 2,
 358         OBJ_BLOB = 3,
 359         OBJ_TAG = 4,
 360         /* 5 for future expansion */
 361         OBJ_OFS_DELTA = 6,
 362         OBJ_REF_DELTA = 7,
 363         OBJ_ANY,
 364         OBJ_MAX,
 365 };
 366
 367 static inline enum object_type object_type(unsigned int mode)
 368 {
 369         return S_ISDIR(mode) ? OBJ_TREE :
 370                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 371                 OBJ_BLOB;
 372 }
 373
 374 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 375 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 376 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 377 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 378 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 379 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 380 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 381 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 382 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 383 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 384 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
 385 #define GITATTRIBUTES_FILE ".gitattributes"
 386 #define INFOATTRIBUTES_FILE "info/attributes"
 387 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 388 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 389 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 390
 391 extern int is_bare_repository_cfg;
 392 extern int is_bare_repository(void);
 393 extern int is_inside_git_dir(void);
 394 extern char *git_work_tree_cfg;
 395 extern int is_inside_work_tree(void);
 396 extern int have_git_dir(void);
 397 extern const char *get_git_dir(void);
 398 extern char *get_object_directory(void);
 399 extern char *get_index_file(void);
 400 extern char *get_graft_file(void);
 401 extern int set_git_dir(const char *path);
 402 extern const char *get_git_work_tree(void);
 403 extern const char *read_gitfile_gently(const char *path);
 404 extern void set_git_work_tree(const char *tree);
 405
 406 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 407
 408 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 409 extern void setup_work_tree(void);
 410 extern const char *setup_git_directory_gently(int *);
 411 extern const char *setup_git_directory(void);
 412 extern const char *prefix_path(const char *prefix, int len, const char *path);
 413 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 414 extern int check_filename(const char *prefix, const char *name);
 415 extern void verify_filename(const char *prefix, const char *name);
 416 extern void verify_non_filename(const char *prefix, const char *name);
 417
 418 #define INIT_DB_QUIET 0x0001
 419
 420 extern int init_db(const char *template_dir, unsigned int flags);
 421
 422 #define alloc_nr(x) (((x)+16)*3/2)
 423
 424 /*
 425  * Realloc the buffer pointed at by variable 'x' so that it can hold
 426  * at least 'nr' entries; the number of entries currently allocated
 427  * is 'alloc', using the standard growing factor alloc_nr() macro.
 428  *
 429  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 430  */
 431 #define ALLOC_GROW(x, nr, alloc) \
 432         do { \
 433                 if ((nr) > alloc) { \
 434                         if (alloc_nr(alloc) < (nr)) \
 435                                 alloc = (nr); \
 436                         else \
 437                                 alloc = alloc_nr(alloc); \
 438                         x = xrealloc((x), alloc * sizeof(*(x))); \
 439                 } \
 440         } while(0)
 441
 442 /* Initialize and use the cache information */
 443 extern int read_index(struct index_state *);
 444 extern int read_index_preload(struct index_state *, const char **pathspec);
 445 extern int read_index_from(struct index_state *, const char *path);
 446 extern int is_index_unborn(struct index_state *);
 447 extern int read_index_unmerged(struct index_state *);
 448 extern int write_index(struct index_state *, int newfd);
 449 extern int discard_index(struct index_state *);
 450 extern int unmerged_index(const struct index_state *);
 451 extern int verify_path(const char *path);
 452 extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 453 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 454 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 455 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 456 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 457 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 458 #define ADD_CACHE_NEW_ONLY 16           /* Do not replace existing ones */
 459 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 460 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 461 extern int remove_index_entry_at(struct index_state *, int pos);
 462 extern void remove_marked_cache_entries(struct index_state *istate);
 463 extern int remove_file_from_index(struct index_state *, const char *path);
 464 #define ADD_CACHE_VERBOSE 1
 465 #define ADD_CACHE_PRETEND 2
 466 #define ADD_CACHE_IGNORE_ERRORS 4
 467 #define ADD_CACHE_IGNORE_REMOVAL 8
 468 #define ADD_CACHE_INTENT 16
 469 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 470 extern int add_file_to_index(struct index_state *, const char *path, int flags);
 471 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 472 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 473 extern int index_name_is_other(const struct index_state *, const char *, int);
 474
 475 /* do stat comparison even if CE_VALID is true */
 476 #define CE_MATCH_IGNORE_VALID           01
 477 /* do not check the contents but report dirty on racily-clean entries */
 478 #define CE_MATCH_RACY_IS_DIRTY          02
 479 /* do stat comparison even if CE_SKIP_WORKTREE is true */
 480 #define CE_MATCH_IGNORE_SKIP_WORKTREE   04
 481 extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 482 extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 483
 484 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 485 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 486 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 487 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 488
 489 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 490 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 491 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 492 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 493 #define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 494 #define REFRESH_IN_PORCELAIN    0x0020  /* user friendly output, not "needs update" */
 495 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen, char *header_msg);
 496
 497 struct lock_file {
 498         struct lock_file *next;
 499         int fd;
 500         pid_t owner;
 501         char on_list;
 502         char filename[PATH_MAX];
 503 };
 504 #define LOCK_DIE_ON_ERROR 1
 505 #define LOCK_NODEREF 2
 506 extern int unable_to_lock_error(const char *path, int err);
 507 extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 508 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 509 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 510 extern int commit_lock_file(struct lock_file *);
 511
 512 extern int hold_locked_index(struct lock_file *, int);
 513 extern int commit_locked_index(struct lock_file *);
 514 extern void set_alternate_index_output(const char *);
 515 extern int close_lock_file(struct lock_file *);
 516 extern void rollback_lock_file(struct lock_file *);
 517 extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 518
 519 /* Environment bits from configuration mechanism */
 520 extern int trust_executable_bit;
 521 extern int trust_ctime;
 522 extern int quote_path_fully;
 523 extern int has_symlinks;
 524 extern int ignore_case;
 525 extern int assume_unchanged;
 526 extern int prefer_symlink_refs;
 527 extern int log_all_ref_updates;
 528 extern int warn_ambiguous_refs;
 529 extern int shared_repository;
 530 extern const char *apply_default_whitespace;
 531 extern const char *apply_default_ignorewhitespace;
 532 extern int zlib_compression_level;
 533 extern int core_compression_level;
 534 extern int core_compression_seen;
 535 extern size_t packed_git_window_size;
 536 extern size_t packed_git_limit;
 537 extern size_t delta_base_cache_limit;
 538 extern int auto_crlf;
 539 extern int read_replace_refs;
 540 extern int fsync_object_files;
 541 extern int core_preload_index;
 542 extern int core_apply_sparse_checkout;
 543
 544 enum safe_crlf {
 545         SAFE_CRLF_FALSE = 0,
 546         SAFE_CRLF_FAIL = 1,
 547         SAFE_CRLF_WARN = 2,
 548 };
 549
 550 extern enum safe_crlf safe_crlf;
 551
 552 enum branch_track {
 553         BRANCH_TRACK_UNSPECIFIED = -1,
 554         BRANCH_TRACK_NEVER = 0,
 555         BRANCH_TRACK_REMOTE,
 556         BRANCH_TRACK_ALWAYS,
 557         BRANCH_TRACK_EXPLICIT,
 558         BRANCH_TRACK_OVERRIDE,
 559 };
 560
 561 enum rebase_setup_type {
 562         AUTOREBASE_NEVER = 0,
 563         AUTOREBASE_LOCAL,
 564         AUTOREBASE_REMOTE,
 565         AUTOREBASE_ALWAYS,
 566 };
 567
 568 enum push_default_type {
 569         PUSH_DEFAULT_NOTHING = 0,
 570         PUSH_DEFAULT_MATCHING,
 571         PUSH_DEFAULT_TRACKING,
 572         PUSH_DEFAULT_CURRENT,
 573 };
 574
 575 extern enum branch_track git_branch_track;
 576 extern enum rebase_setup_type autorebase;
 577 extern enum push_default_type push_default;
 578
 579 enum object_creation_mode {
 580         OBJECT_CREATION_USES_HARDLINKS = 0,
 581         OBJECT_CREATION_USES_RENAMES = 1,
 582 };
 583
 584 extern enum object_creation_mode object_creation_mode;
 585
 586 extern char *notes_ref_name;
 587
 588 extern int grafts_replace_parents;
 589
 590 #define GIT_REPO_VERSION 0
 591 extern int repository_format_version;
 592 extern int check_repository_format(void);
 593
 594 #define MTIME_CHANGED   0x0001
 595 #define CTIME_CHANGED   0x0002
 596 #define OWNER_CHANGED   0x0004
 597 #define MODE_CHANGED    0x0008
 598 #define INODE_CHANGED   0x0010
 599 #define DATA_CHANGED    0x0020
 600 #define TYPE_CHANGED    0x0040
 601
 602 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 603         __attribute__((format (printf, 3, 4)));
 604 extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 605         __attribute__((format (printf, 3, 4)));
 606 extern char *git_pathdup(const char *fmt, ...)
 607         __attribute__((format (printf, 1, 2)));
 608
 609 /* Return a statically allocated filename matching the sha1 signature */
 610 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 611 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 612 extern char *sha1_file_name(const unsigned char *sha1);
 613 extern char *sha1_pack_name(const unsigned char *sha1);
 614 extern char *sha1_pack_index_name(const unsigned char *sha1);
 615 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 616 extern const unsigned char null_sha1[20];
 617 static inline int is_null_sha1(const unsigned char *sha1)
 618 {
 619         return !memcmp(sha1, null_sha1, 20);
 620 }
 621 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 622 {
 623         return memcmp(sha1, sha2, 20);
 624 }
 625 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 626 {
 627         memcpy(sha_dst, sha_src, 20);
 628 }
 629 static inline void hashclr(unsigned char *hash)
 630 {
 631         memset(hash, 0, 20);
 632 }
 633
 634 #define EMPTY_TREE_SHA1_HEX \
 635         "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 636 #define EMPTY_TREE_SHA1_BIN \
 637          "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 638          "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 639
 640 int git_mkstemp(char *path, size_t n, const char *template);
 641
 642 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 643
 644 /*
 645  * NOTE NOTE NOTE!!
 646  *
 647  * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 648  * not be changed. Old repositories have core.sharedrepository written in
 649  * numeric format, and therefore these values are preserved for compatibility
 650  * reasons.
 651  */
 652 enum sharedrepo {
 653         PERM_UMASK          = 0,
 654         OLD_PERM_GROUP      = 1,
 655         OLD_PERM_EVERYBODY  = 2,
 656         PERM_GROUP          = 0660,
 657         PERM_EVERYBODY      = 0664,
 658 };
 659 int git_config_perm(const char *var, const char *value);
 660 int set_shared_perm(const char *path, int mode);
 661 #define adjust_shared_perm(path) set_shared_perm((path), 0)
 662 int safe_create_leading_directories(char *path);
 663 int safe_create_leading_directories_const(const char *path);
 664 extern char *expand_user_path(const char *path);
 665 char *enter_repo(char *path, int strict);
 666 static inline int is_absolute_path(const char *path)
 667 {
 668         return path[0] == '/' || has_dos_drive_prefix(path);
 669 }
 670 int is_directory(const char *);
 671 const char *make_absolute_path(const char *path);
 672 const char *make_nonrelative_path(const char *path);
 673 const char *make_relative_path(const char *abs, const char *base);
 674 int normalize_path_copy(char *dst, const char *src);
 675 int longest_ancestor_length(const char *path, const char *prefix_list);
 676 char *strip_path_suffix(const char *path, const char *suffix);
 677 int daemon_avoid_alias(const char *path);
 678
 679 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 680 extern int sha1_object_info(const unsigned char *, unsigned long *);
 681 extern void *read_sha1_file_repl(const unsigned char *sha1, enum object_type *type, unsigned long *size, const unsigned char **replacement);
 682 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 683 {
 684         return read_sha1_file_repl(sha1, type, size, NULL);
 685 }
 686 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 687 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 688 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 689 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 690
 691 /* global flag to enable extra checks when accessing packed objects */
 692 extern int do_check_packed_object_crc;
 693
 694 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 695
 696 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 697
 698 extern int has_sha1_pack(const unsigned char *sha1);
 699 extern int has_sha1_file(const unsigned char *sha1);
 700 extern int has_loose_object_nonlocal(const unsigned char *sha1);
 701
 702 extern int has_pack_index(const unsigned char *sha1);
 703
 704 extern const signed char hexval_table[256];
 705 static inline unsigned int hexval(unsigned char c)
 706 {
 707         return hexval_table[c];
 708 }
 709
 710 /* Convert to/from hex/sha1 representation */
 711 #define MINIMUM_ABBREV 4
 712 #define DEFAULT_ABBREV 7
 713
 714 extern int get_sha1(const char *str, unsigned char *sha1);
 715 extern int get_sha1_with_mode_1(const char *str, unsigned char *sha1, unsigned *mode, int gently, const char *prefix);
 716 static inline int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode)
 717 {
 718         return get_sha1_with_mode_1(str, sha1, mode, 1, NULL);
 719 }
 720 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 721 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 722 extern int read_ref(const char *filename, unsigned char *sha1);
 723 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 724 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 725 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 726 extern int interpret_branch_name(const char *str, struct strbuf *);
 727 extern int get_sha1_mb(const char *str, unsigned char *sha1);
 728
 729 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 730 extern const char *ref_rev_parse_rules[];
 731 extern const char *ref_fetch_rules[];
 732
 733 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 734 extern int validate_headref(const char *ref);
 735
 736 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 737 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 738 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 739
 740 extern void *read_object_with_reference(const unsigned char *sha1,
 741                                         const char *required_type,
 742                                         unsigned long *size,
 743                                         unsigned char *sha1_ret);
 744
 745 extern struct object *peel_to_type(const char *name, int namelen,
 746                                    struct object *o, enum object_type);
 747
 748 enum date_mode {
 749         DATE_NORMAL = 0,
 750         DATE_RELATIVE,
 751         DATE_SHORT,
 752         DATE_LOCAL,
 753         DATE_ISO8601,
 754         DATE_RFC2822,
 755         DATE_RAW
 756 };
 757
 758 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 759 const char *show_date_relative(unsigned long time, int tz,
 760                                const struct timeval *now,
 761                                char *timebuf,
 762                                size_t timebuf_size);
 763 int parse_date(const char *date, char *buf, int bufsize);
 764 void datestamp(char *buf, int bufsize);
 765 #define approxidate(s) approxidate_careful((s), NULL)
 766 unsigned long approxidate_careful(const char *, int *);
 767 unsigned long approxidate_relative(const char *date, const struct timeval *now);
 768 enum date_mode parse_date_format(const char *format);
 769
 770 #define IDENT_WARN_ON_NO_NAME  1
 771 #define IDENT_ERROR_ON_NO_NAME 2
 772 #define IDENT_NO_DATE          4
 773 extern const char *git_author_info(int);
 774 extern const char *git_committer_info(int);
 775 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 776 extern const char *fmt_name(const char *name, const char *email);
 777 extern const char *git_editor(void);
 778 extern const char *git_pager(void);
 779
 780 struct checkout {
 781         const char *base_dir;
 782         int base_dir_len;
 783         unsigned force:1,
 784                  quiet:1,
 785                  not_new:1,
 786                  refresh_cache:1;
 787 };
 788
 789 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 790
 791 struct cache_def {
 792         char path[PATH_MAX + 1];
 793         int len;
 794         int flags;
 795         int track_flags;
 796         int prefix_len_stat_func;
 797 };
 798
 799 extern int has_symlink_leading_path(const char *name, int len);
 800 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 801 extern int has_symlink_or_noent_leading_path(const char *name, int len);
 802 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
 803 extern void schedule_dir_for_removal(const char *name, int len);
 804 extern void remove_scheduled_dirs(void);
 805
 806 extern struct alternate_object_database {
 807         struct alternate_object_database *next;
 808         char *name;
 809         char base[FLEX_ARRAY]; /* more */
 810 } *alt_odb_list;
 811 extern void prepare_alt_odb(void);
 812 extern void add_to_alternates_file(const char *reference);
 813 typedef int alt_odb_fn(struct alternate_object_database *, void *);
 814 extern void foreach_alt_odb(alt_odb_fn, void*);
 815
 816 struct pack_window {
 817         struct pack_window *next;
 818         unsigned char *base;
 819         off_t offset;
 820         size_t len;
 821         unsigned int last_used;
 822         unsigned int inuse_cnt;
 823 };
 824
 825 extern struct packed_git {
 826         struct packed_git *next;
 827         struct pack_window *windows;
 828         off_t pack_size;
 829         const void *index_data;
 830         size_t index_size;
 831         uint32_t num_objects;
 832         uint32_t num_bad_objects;
 833         unsigned char *bad_object_sha1;
 834         int index_version;
 835         time_t mtime;
 836         int pack_fd;
 837         unsigned pack_local:1,
 838                  pack_keep:1;
 839         unsigned char sha1[20];
 840         /* something like ".git/objects/pack/xxxxx.pack" */
 841         char pack_name[FLEX_ARRAY]; /* more */
 842 } *packed_git;
 843
 844 struct pack_entry {
 845         off_t offset;
 846         unsigned char sha1[20];
 847         struct packed_git *p;
 848 };
 849
 850 struct ref {
 851         struct ref *next;
 852         unsigned char old_sha1[20];
 853         unsigned char new_sha1[20];
 854         char *symref;
 855         unsigned int force:1,
 856                 merge:1,
 857                 nonfastforward:1,
 858                 deletion:1;
 859         enum {
 860                 REF_STATUS_NONE = 0,
 861                 REF_STATUS_OK,
 862                 REF_STATUS_REJECT_NONFASTFORWARD,
 863                 REF_STATUS_REJECT_NODELETE,
 864                 REF_STATUS_UPTODATE,
 865                 REF_STATUS_REMOTE_REJECT,
 866                 REF_STATUS_EXPECTING_REPORT,
 867         } status;
 868         char *remote_status;
 869         struct ref *peer_ref; /* when renaming */
 870         char name[FLEX_ARRAY]; /* more */
 871 };
 872
 873 #define REF_NORMAL      (1u << 0)
 874 #define REF_HEADS       (1u << 1)
 875 #define REF_TAGS        (1u << 2)
 876
 877 extern struct ref *find_ref_by_name(const struct ref *list, const char *name);
 878
 879 #define CONNECT_VERBOSE       (1u << 0)
 880 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 881 extern int finish_connect(struct child_process *conn);
 882 extern int path_match(const char *path, int nr, char **match);
 883 struct extra_have_objects {
 884         int nr, alloc;
 885         unsigned char (*array)[20];
 886 };
 887 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags, struct extra_have_objects *);
 888 extern int server_supports(const char *feature);
 889
 890 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 891
 892 extern void prepare_packed_git(void);
 893 extern void reprepare_packed_git(void);
 894 extern void install_packed_git(struct packed_git *pack);
 895
 896 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 897                                          struct packed_git *packs);
 898
 899 extern void pack_report(void);
 900 extern int open_pack_index(struct packed_git *);
 901 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 902 extern void close_pack_windows(struct packed_git *);
 903 extern void unuse_pack(struct pack_window **);
 904 extern void free_pack_by_name(const char *);
 905 extern void clear_delta_base_cache(void);
 906 extern struct packed_git *add_packed_git(const char *, int, int);
 907 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 908 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
 909 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 910 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 911 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 912 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 913 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 914
 915 /* Dumb servers support */
 916 extern int update_server_info(int);
 917
 918 typedef int (*config_fn_t)(const char *, const char *, void *);
 919 extern int git_default_config(const char *, const char *, void *);
 920 extern int git_config_from_file(config_fn_t fn, const char *, void *);
 921 extern int git_config(config_fn_t fn, void *);
 922 extern int git_parse_ulong(const char *, unsigned long *);
 923 extern int git_config_int(const char *, const char *);
 924 extern unsigned long git_config_ulong(const char *, const char *);
 925 extern int git_config_bool_or_int(const char *, const char *, int *);
 926 extern int git_config_bool(const char *, const char *);
 927 extern int git_config_string(const char **, const char *, const char *);
 928 extern int git_config_pathname(const char **, const char *, const char *);
 929 extern int git_config_set(const char *, const char *);
 930 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 931 extern int git_config_rename_section(const char *, const char *);
 932 extern const char *git_etc_gitconfig(void);
 933 extern int check_repository_format_version(const char *var, const char *value, void *cb);
 934 extern int git_config_system(void);
 935 extern int git_config_global(void);
 936 extern int config_error_nonbool(const char *);
 937 extern const char *config_exclusive_filename;
 938
 939 #define MAX_GITNAME (1000)
 940 extern char git_default_email[MAX_GITNAME];
 941 extern char git_default_name[MAX_GITNAME];
 942 #define IDENT_NAME_GIVEN 01
 943 #define IDENT_MAIL_GIVEN 02
 944 #define IDENT_ALL_GIVEN (IDENT_NAME_GIVEN|IDENT_MAIL_GIVEN)
 945 extern int user_ident_explicitly_given;
 946 extern int user_ident_sufficiently_given(void);
 947
 948 extern const char *git_commit_encoding;
 949 extern const char *git_log_output_encoding;
 950 extern const char *git_mailmap_file;
 951
 952 /* IO helper functions */
 953 extern void maybe_flush_or_die(FILE *, const char *);
 954 extern int copy_fd(int ifd, int ofd);
 955 extern int copy_file(const char *dst, const char *src, int mode);
 956 extern int copy_file_with_time(const char *dst, const char *src, int mode);
 957 extern void write_or_die(int fd, const void *buf, size_t count);
 958 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 959 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 960 extern void fsync_or_die(int fd, const char *);
 961
 962 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 963 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
 964 static inline ssize_t write_str_in_full(int fd, const char *str)
 965 {
 966         return write_in_full(fd, str, strlen(str));
 967 }
 968
 969 /* pager.c */
 970 extern void setup_pager(void);
 971 extern const char *pager_program;
 972 extern int pager_in_use(void);
 973 extern int pager_use_color;
 974
 975 extern const char *editor_program;
 976 extern const char *excludes_file;
 977
 978 /* base85 */
 979 int decode_85(char *dst, const char *line, int linelen);
 980 void encode_85(char *buf, const unsigned char *data, int bytes);
 981
 982 /* alloc.c */
 983 extern void *alloc_blob_node(void);
 984 extern void *alloc_tree_node(void);
 985 extern void *alloc_commit_node(void);
 986 extern void *alloc_tag_node(void);
 987 extern void *alloc_object_node(void);
 988 extern void alloc_report(void);
 989
 990 /* trace.c */
 991 __attribute__((format (printf, 1, 2)))
 992 extern void trace_printf(const char *format, ...);
 993 __attribute__((format (printf, 2, 3)))
 994 extern void trace_argv_printf(const char **argv, const char *format, ...);
 995
 996 /* convert.c */
 997 /* returns 1 if *dst was used */
 998 extern int convert_to_git(const char *path, const char *src, size_t len,
 999                           struct strbuf *dst, enum safe_crlf checksafe);
1000 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
1001
1002 /* add */
1003 /*
1004  * return 0 if success, 1 - if addition of a file failed and
1005  * ADD_FILES_IGNORE_ERRORS was specified in flags
1006  */
1007 int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
1008
1009 /* diff.c */
1010 extern int diff_auto_refresh_index;
1011
1012 /* match-trees.c */
1013 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1014 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1015
1016 /*
1017  * whitespace rules.
1018  * used by both diff and apply
1019  */
1020 #define WS_BLANK_AT_EOL         01
1021 #define WS_SPACE_BEFORE_TAB     02
1022 #define WS_INDENT_WITH_NON_TAB  04
1023 #define WS_CR_AT_EOL           010
1024 #define WS_BLANK_AT_EOF        020
1025 #define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1026 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
1027 extern unsigned whitespace_rule_cfg;
1028 extern unsigned whitespace_rule(const char *);
1029 extern unsigned parse_whitespace_rule(const char *);
1030 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1031 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1032 extern char *whitespace_error_string(unsigned ws);
1033 extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
1034 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1035
1036 /* ls-files */
1037 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
1038 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1039
1040 char *alias_lookup(const char *alias);
1041 int split_cmdline(char *cmdline, const char ***argv);
1042
1043 #endif /* CACHE_H */