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 #include "gettext.h"
   9 #include "convert.h"
  10
  11 #include SHA1_HEADER
  12 #ifndef git_SHA_CTX
  13 #define git_SHA_CTX     SHA_CTX
  14 #define git_SHA1_Init   SHA1_Init
  15 #define git_SHA1_Update SHA1_Update
  16 #define git_SHA1_Final  SHA1_Final
  17 #endif
  18
  19 #include <zlib.h>
  20 typedef struct git_zstream {
  21         z_stream z;
  22         unsigned long avail_in;
  23         unsigned long avail_out;
  24         unsigned long total_in;
  25         unsigned long total_out;
  26         unsigned char *next_in;
  27         unsigned char *next_out;
  28 } git_zstream;
  29
  30 void git_inflate_init(git_zstream *);
  31 void git_inflate_init_gzip_only(git_zstream *);
  32 void git_inflate_end(git_zstream *);
  33 int git_inflate(git_zstream *, int flush);
  34
  35 void git_deflate_init(git_zstream *, int level);
  36 void git_deflate_init_gzip(git_zstream *, int level);
  37 void git_deflate_end(git_zstream *);
  38 int git_deflate_abort(git_zstream *);
  39 int git_deflate_end_gently(git_zstream *);
  40 int git_deflate(git_zstream *, int flush);
  41 unsigned long git_deflate_bound(git_zstream *, unsigned long);
  42
  43 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  44 #define DTYPE(de)       ((de)->d_type)
  45 #else
  46 #undef DT_UNKNOWN
  47 #undef DT_DIR
  48 #undef DT_REG
  49 #undef DT_LNK
  50 #define DT_UNKNOWN      0
  51 #define DT_DIR          1
  52 #define DT_REG          2
  53 #define DT_LNK          3
  54 #define DTYPE(de)       DT_UNKNOWN
  55 #endif
  56
  57 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  58 #define S_IFINVALID     0030000
  59
  60 /*
  61  * A "directory link" is a link to another git directory.
  62  *
  63  * The value 0160000 is not normally a valid mode, and
  64  * also just happens to be S_IFDIR + S_IFLNK
  65  *
  66  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  67  * always having the same values everywhere. We should use
  68  * our internal git values for these things, and then we can
  69  * translate that to the OS-specific value. It just so
  70  * happens that everybody shares the same bit representation
  71  * in the UNIX world (and apparently wider too..)
  72  */
  73 #define S_IFGITLINK     0160000
  74 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  75
  76 /*
  77  * Intensive research over the course of many years has shown that
  78  * port 9418 is totally unused by anything else. Or
  79  *
  80  *      Your search - "port 9418" - did not match any documents.
  81  *
  82  * as www.google.com puts it.
  83  *
  84  * This port has been properly assigned for git use by IANA:
  85  * git (Assigned-9418) [I06-050728-0001].
  86  *
  87  *      git  9418/tcp   git pack transfer service
  88  *      git  9418/udp   git pack transfer service
  89  *
  90  * with Linus Torvalds <torvalds@osdl.org> as the point of
  91  * contact. September 2005.
  92  *
  93  * See http://www.iana.org/assignments/port-numbers
  94  */
  95 #define DEFAULT_GIT_PORT 9418
  96
  97 /*
  98  * Basic data structures for the directory cache
  99  */
 100
 101 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
 102 struct cache_header {
 103         unsigned int hdr_signature;
 104         unsigned int hdr_version;
 105         unsigned int hdr_entries;
 106 };
 107
 108 #define INDEX_FORMAT_LB 2
 109 #define INDEX_FORMAT_UB 4
 110
 111 /*
 112  * The "cache_time" is just the low 32 bits of the
 113  * time. It doesn't matter if it overflows - we only
 114  * check it for equality in the 32 bits we save.
 115  */
 116 struct cache_time {
 117         unsigned int sec;
 118         unsigned int nsec;
 119 };
 120
 121 struct cache_entry {
 122         struct cache_time ce_ctime;
 123         struct cache_time ce_mtime;
 124         unsigned int ce_dev;
 125         unsigned int ce_ino;
 126         unsigned int ce_mode;
 127         unsigned int ce_uid;
 128         unsigned int ce_gid;
 129         unsigned int ce_size;
 130         unsigned int ce_flags;
 131         unsigned int ce_namelen;
 132         unsigned char sha1[20];
 133         struct cache_entry *next;
 134         struct cache_entry *dir_next;
 135         char name[FLEX_ARRAY]; /* more */
 136 };
 137
 138 #define CE_STAGEMASK (0x3000)
 139 #define CE_EXTENDED  (0x4000)
 140 #define CE_VALID     (0x8000)
 141 #define CE_STAGESHIFT 12
 142
 143 /*
 144  * Range 0xFFFF0000 in ce_flags is divided into
 145  * two parts: in-memory flags and on-disk ones.
 146  * Flags in CE_EXTENDED_FLAGS will get saved on-disk
 147  * if you want to save a new flag, add it in
 148  * CE_EXTENDED_FLAGS
 149  *
 150  * In-memory only flags
 151  */
 152 #define CE_UPDATE            (1 << 16)
 153 #define CE_REMOVE            (1 << 17)
 154 #define CE_UPTODATE          (1 << 18)
 155 #define CE_ADDED             (1 << 19)
 156
 157 #define CE_HASHED            (1 << 20)
 158 #define CE_UNHASHED          (1 << 21)
 159 #define CE_WT_REMOVE         (1 << 22) /* remove in work directory */
 160 #define CE_CONFLICTED        (1 << 23)
 161
 162 #define CE_UNPACKED          (1 << 24)
 163 #define CE_NEW_SKIP_WORKTREE (1 << 25)
 164
 165 /*
 166  * Extended on-disk flags
 167  */
 168 #define CE_INTENT_TO_ADD     (1 << 29)
 169 #define CE_SKIP_WORKTREE     (1 << 30)
 170 /* CE_EXTENDED2 is for future extension */
 171 #define CE_EXTENDED2         (1 << 31)
 172
 173 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
 174
 175 /*
 176  * Safeguard to avoid saving wrong flags:
 177  *  - CE_EXTENDED2 won't get saved until its semantic is known
 178  *  - Bits in 0x0000FFFF have been saved in ce_flags already
 179  *  - Bits in 0x003F0000 are currently in-memory flags
 180  */
 181 #if CE_EXTENDED_FLAGS & 0x803FFFFF
 182 #error "CE_EXTENDED_FLAGS out of range"
 183 #endif
 184
 185 /*
 186  * Copy the sha1 and stat state of a cache entry from one to
 187  * another. But we never change the name, or the hash state!
 188  */
 189 #define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 190 static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
 191 {
 192         unsigned int state = dst->ce_flags & CE_STATE_MASK;
 193
 194         /* Don't copy hash chain and name */
 195         memcpy(dst, src, offsetof(struct cache_entry, next));
 196
 197         /* Restore the hash state */
 198         dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 199 }
 200
 201 static inline unsigned create_ce_flags(unsigned stage)
 202 {
 203         return (stage << CE_STAGESHIFT);
 204 }
 205
 206 #define ce_namelen(ce) ((ce)->ce_namelen)
 207 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 208 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 209 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 210 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
 211 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 212
 213 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 214 static inline unsigned int create_ce_mode(unsigned int mode)
 215 {
 216         if (S_ISLNK(mode))
 217                 return S_IFLNK;
 218         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 219                 return S_IFGITLINK;
 220         return S_IFREG | ce_permissions(mode);
 221 }
 222 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 223 {
 224         extern int trust_executable_bit, has_symlinks;
 225         if (!has_symlinks && S_ISREG(mode) &&
 226             ce && S_ISLNK(ce->ce_mode))
 227                 return ce->ce_mode;
 228         if (!trust_executable_bit && S_ISREG(mode)) {
 229                 if (ce && S_ISREG(ce->ce_mode))
 230                         return ce->ce_mode;
 231                 return create_ce_mode(0666);
 232         }
 233         return create_ce_mode(mode);
 234 }
 235 static inline int ce_to_dtype(const struct cache_entry *ce)
 236 {
 237         unsigned ce_mode = ntohl(ce->ce_mode);
 238         if (S_ISREG(ce_mode))
 239                 return DT_REG;
 240         else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 241                 return DT_DIR;
 242         else if (S_ISLNK(ce_mode))
 243                 return DT_LNK;
 244         else
 245                 return DT_UNKNOWN;
 246 }
 247 static inline unsigned int canon_mode(unsigned int mode)
 248 {
 249         if (S_ISREG(mode))
 250                 return S_IFREG | ce_permissions(mode);
 251         if (S_ISLNK(mode))
 252                 return S_IFLNK;
 253         if (S_ISDIR(mode))
 254                 return S_IFDIR;
 255         return S_IFGITLINK;
 256 }
 257
 258 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
 259
 260 struct index_state {
 261         struct cache_entry **cache;
 262         unsigned int version;
 263         unsigned int cache_nr, cache_alloc, cache_changed;
 264         struct string_list *resolve_undo;
 265         struct cache_tree *cache_tree;
 266         struct cache_time timestamp;
 267         unsigned name_hash_initialized : 1,
 268                  initialized : 1;
 269         struct hash_table name_hash;
 270 };
 271
 272 extern struct index_state the_index;
 273
 274 /* Name hashing */
 275 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 276 /*
 277  * We don't actually *remove* it, we can just mark it invalid so that
 278  * we won't find it in lookups.
 279  *
 280  * Not only would we have to search the lists (simple enough), but
 281  * we'd also have to rehash other hash buckets in case this makes the
 282  * hash bucket empty (common). So it's much better to just mark
 283  * it.
 284  */
 285 static inline void remove_name_hash(struct cache_entry *ce)
 286 {
 287         ce->ce_flags |= CE_UNHASHED;
 288 }
 289
 290
 291 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 292 #define active_cache (the_index.cache)
 293 #define active_nr (the_index.cache_nr)
 294 #define active_alloc (the_index.cache_alloc)
 295 #define active_cache_changed (the_index.cache_changed)
 296 #define active_cache_tree (the_index.cache_tree)
 297
 298 #define read_cache() read_index(&the_index)
 299 #define read_cache_from(path) read_index_from(&the_index, (path))
 300 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 301 #define is_cache_unborn() is_index_unborn(&the_index)
 302 #define read_cache_unmerged() read_index_unmerged(&the_index)
 303 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 304 #define discard_cache() discard_index(&the_index)
 305 #define unmerged_cache() unmerged_index(&the_index)
 306 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 307 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 308 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 309 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 310 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 311 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 312 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 313 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
 314 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 315 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 316 #define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
 317 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 318 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 319 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
 320 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
 321 #endif
 322
 323 enum object_type {
 324         OBJ_BAD = -1,
 325         OBJ_NONE = 0,
 326         OBJ_COMMIT = 1,
 327         OBJ_TREE = 2,
 328         OBJ_BLOB = 3,
 329         OBJ_TAG = 4,
 330         /* 5 for future expansion */
 331         OBJ_OFS_DELTA = 6,
 332         OBJ_REF_DELTA = 7,
 333         OBJ_ANY,
 334         OBJ_MAX
 335 };
 336
 337 static inline enum object_type object_type(unsigned int mode)
 338 {
 339         return S_ISDIR(mode) ? OBJ_TREE :
 340                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 341                 OBJ_BLOB;
 342 }
 343
 344 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 345 #define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
 346 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 347 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 348 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 349 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 350 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 351 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 352 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 353 #define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
 354 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 355 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 356 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
 357 #define GITATTRIBUTES_FILE ".gitattributes"
 358 #define INFOATTRIBUTES_FILE "info/attributes"
 359 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 360 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 361 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 362 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
 363 #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
 364 #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
 365
 366 /*
 367  * Repository-local GIT_* environment variables
 368  * The array is NULL-terminated to simplify its usage in contexts such
 369  * environment creation or simple walk of the list.
 370  * The number of non-NULL entries is available as a macro.
 371  */
 372 #define LOCAL_REPO_ENV_SIZE 9
 373 extern const char *const local_repo_env[LOCAL_REPO_ENV_SIZE + 1];
 374
 375 extern int is_bare_repository_cfg;
 376 extern int is_bare_repository(void);
 377 extern int is_inside_git_dir(void);
 378 extern char *git_work_tree_cfg;
 379 extern int is_inside_work_tree(void);
 380 extern int have_git_dir(void);
 381 extern const char *get_git_dir(void);
 382 extern int is_git_directory(const char *path);
 383 extern char *get_object_directory(void);
 384 extern char *get_index_file(void);
 385 extern char *get_graft_file(void);
 386 extern int set_git_dir(const char *path);
 387 extern const char *get_git_namespace(void);
 388 extern const char *strip_namespace(const char *namespaced_ref);
 389 extern const char *get_git_work_tree(void);
 390 extern const char *read_gitfile(const char *path);
 391 extern const char *resolve_gitdir(const char *suspect);
 392 extern void set_git_work_tree(const char *tree);
 393
 394 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 395
 396 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 397 extern void setup_work_tree(void);
 398 extern const char *setup_git_directory_gently(int *);
 399 extern const char *setup_git_directory(void);
 400 extern char *prefix_path(const char *prefix, int len, const char *path);
 401 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 402 extern int check_filename(const char *prefix, const char *name);
 403 extern void verify_filename(const char *prefix,
 404                             const char *name,
 405                             int diagnose_misspelt_rev);
 406 extern void verify_non_filename(const char *prefix, const char *name);
 407 extern int path_inside_repo(const char *prefix, const char *path);
 408
 409 #define INIT_DB_QUIET 0x0001
 410
 411 extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
 412 extern int init_db(const char *template_dir, unsigned int flags);
 413
 414 #define alloc_nr(x) (((x)+16)*3/2)
 415
 416 /*
 417  * Realloc the buffer pointed at by variable 'x' so that it can hold
 418  * at least 'nr' entries; the number of entries currently allocated
 419  * is 'alloc', using the standard growing factor alloc_nr() macro.
 420  *
 421  * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
 422  */
 423 #define ALLOC_GROW(x, nr, alloc) \
 424         do { \
 425                 if ((nr) > alloc) { \
 426                         if (alloc_nr(alloc) < (nr)) \
 427                                 alloc = (nr); \
 428                         else \
 429                                 alloc = alloc_nr(alloc); \
 430                         x = xrealloc((x), alloc * sizeof(*(x))); \
 431                 } \
 432         } while (0)
 433
 434 /* Initialize and use the cache information */
 435 extern int read_index(struct index_state *);
 436 extern int read_index_preload(struct index_state *, const char **pathspec);
 437 extern int read_index_from(struct index_state *, const char *path);
 438 extern int is_index_unborn(struct index_state *);
 439 extern int read_index_unmerged(struct index_state *);
 440 extern int write_index(struct index_state *, int newfd);
 441 extern int discard_index(struct index_state *);
 442 extern int unmerged_index(const struct index_state *);
 443 extern int verify_path(const char *path);
 444 extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 445 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 446 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 447 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 448 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 449 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 450 #define ADD_CACHE_NEW_ONLY 16           /* Do not replace existing ones */
 451 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 452 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 453 extern int remove_index_entry_at(struct index_state *, int pos);
 454 extern void remove_marked_cache_entries(struct index_state *istate);
 455 extern int remove_file_from_index(struct index_state *, const char *path);
 456 #define ADD_CACHE_VERBOSE 1
 457 #define ADD_CACHE_PRETEND 2
 458 #define ADD_CACHE_IGNORE_ERRORS 4
 459 #define ADD_CACHE_IGNORE_REMOVAL 8
 460 #define ADD_CACHE_INTENT 16
 461 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 462 extern int add_file_to_index(struct index_state *, const char *path, int flags);
 463 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 464 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 465 extern int index_name_is_other(const struct index_state *, const char *, int);
 466
 467 /* do stat comparison even if CE_VALID is true */
 468 #define CE_MATCH_IGNORE_VALID           01
 469 /* do not check the contents but report dirty on racily-clean entries */
 470 #define CE_MATCH_RACY_IS_DIRTY          02
 471 /* do stat comparison even if CE_SKIP_WORKTREE is true */
 472 #define CE_MATCH_IGNORE_SKIP_WORKTREE   04
 473 extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 474 extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 475
 476 struct pathspec {
 477         const char **raw; /* get_pathspec() result, not freed by free_pathspec() */
 478         int nr;
 479         unsigned int has_wildcard:1;
 480         unsigned int recursive:1;
 481         int max_depth;
 482         struct pathspec_item {
 483                 const char *match;
 484                 int len;
 485                 unsigned int use_wildcard:1;
 486         } *items;
 487 };
 488
 489 extern int init_pathspec(struct pathspec *, const char **);
 490 extern void free_pathspec(struct pathspec *);
 491 extern int ce_path_match(const struct cache_entry *ce, const struct pathspec *pathspec);
 492
 493 #define HASH_WRITE_OBJECT 1
 494 #define HASH_FORMAT_CHECK 2
 495 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
 496 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
 497 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 498
 499 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 500 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 501 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 502 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 503 #define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 504 #define REFRESH_IN_PORCELAIN    0x0020  /* user friendly output, not "needs update" */
 505 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen, const char *header_msg);
 506
 507 struct lock_file {
 508         struct lock_file *next;
 509         int fd;
 510         pid_t owner;
 511         char on_list;
 512         char filename[PATH_MAX];
 513 };
 514 #define LOCK_DIE_ON_ERROR 1
 515 #define LOCK_NODEREF 2
 516 extern int unable_to_lock_error(const char *path, int err);
 517 extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 518 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 519 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 520 extern int commit_lock_file(struct lock_file *);
 521 extern void update_index_if_able(struct index_state *, struct lock_file *);
 522
 523 extern int hold_locked_index(struct lock_file *, int);
 524 extern int commit_locked_index(struct lock_file *);
 525 extern void set_alternate_index_output(const char *);
 526 extern int close_lock_file(struct lock_file *);
 527 extern void rollback_lock_file(struct lock_file *);
 528 extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 529
 530 /* Environment bits from configuration mechanism */
 531 extern int trust_executable_bit;
 532 extern int trust_ctime;
 533 extern int quote_path_fully;
 534 extern int has_symlinks;
 535 extern int minimum_abbrev, default_abbrev;
 536 extern int ignore_case;
 537 extern int assume_unchanged;
 538 extern int prefer_symlink_refs;
 539 extern int log_all_ref_updates;
 540 extern int warn_ambiguous_refs;
 541 extern int shared_repository;
 542 extern const char *apply_default_whitespace;
 543 extern const char *apply_default_ignorewhitespace;
 544 extern const char *git_attributes_file;
 545 extern int zlib_compression_level;
 546 extern int core_compression_level;
 547 extern int core_compression_seen;
 548 extern size_t packed_git_window_size;
 549 extern size_t packed_git_limit;
 550 extern size_t delta_base_cache_limit;
 551 extern unsigned long big_file_threshold;
 552 extern unsigned long pack_size_limit_cfg;
 553 extern int read_replace_refs;
 554 extern int fsync_object_files;
 555 extern int core_preload_index;
 556 extern int core_apply_sparse_checkout;
 557 extern int precomposed_unicode;
 558
 559 enum hide_dotfiles_type {
 560         HIDE_DOTFILES_FALSE = 0,
 561         HIDE_DOTFILES_TRUE,
 562         HIDE_DOTFILES_DOTGITONLY,
 563 };
 564 extern enum hide_dotfiles_type hide_dotfiles;
 565
 566 enum branch_track {
 567         BRANCH_TRACK_UNSPECIFIED = -1,
 568         BRANCH_TRACK_NEVER = 0,
 569         BRANCH_TRACK_REMOTE,
 570         BRANCH_TRACK_ALWAYS,
 571         BRANCH_TRACK_EXPLICIT,
 572         BRANCH_TRACK_OVERRIDE
 573 };
 574
 575 enum rebase_setup_type {
 576         AUTOREBASE_NEVER = 0,
 577         AUTOREBASE_LOCAL,
 578         AUTOREBASE_REMOTE,
 579         AUTOREBASE_ALWAYS
 580 };
 581
 582 enum push_default_type {
 583         PUSH_DEFAULT_NOTHING = 0,
 584         PUSH_DEFAULT_MATCHING,
 585         PUSH_DEFAULT_SIMPLE,
 586         PUSH_DEFAULT_UPSTREAM,
 587         PUSH_DEFAULT_CURRENT,
 588         PUSH_DEFAULT_UNSPECIFIED
 589 };
 590
 591 extern enum branch_track git_branch_track;
 592 extern enum rebase_setup_type autorebase;
 593 extern enum push_default_type push_default;
 594
 595 enum object_creation_mode {
 596         OBJECT_CREATION_USES_HARDLINKS = 0,
 597         OBJECT_CREATION_USES_RENAMES = 1
 598 };
 599
 600 extern enum object_creation_mode object_creation_mode;
 601
 602 extern char *notes_ref_name;
 603
 604 extern int grafts_replace_parents;
 605
 606 #define GIT_REPO_VERSION 0
 607 extern int repository_format_version;
 608 extern int check_repository_format(void);
 609
 610 #define MTIME_CHANGED   0x0001
 611 #define CTIME_CHANGED   0x0002
 612 #define OWNER_CHANGED   0x0004
 613 #define MODE_CHANGED    0x0008
 614 #define INODE_CHANGED   0x0010
 615 #define DATA_CHANGED    0x0020
 616 #define TYPE_CHANGED    0x0040
 617
 618 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 619         __attribute__((format (printf, 3, 4)));
 620 extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 621         __attribute__((format (printf, 3, 4)));
 622 extern char *git_pathdup(const char *fmt, ...)
 623         __attribute__((format (printf, 1, 2)));
 624 extern char *mkpathdup(const char *fmt, ...)
 625         __attribute__((format (printf, 1, 2)));
 626
 627 /* Return a statically allocated filename matching the sha1 signature */
 628 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 629 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 630 extern char *git_path_submodule(const char *path, const char *fmt, ...)
 631         __attribute__((format (printf, 2, 3)));
 632
 633 extern char *sha1_file_name(const unsigned char *sha1);
 634 extern char *sha1_pack_name(const unsigned char *sha1);
 635 extern char *sha1_pack_index_name(const unsigned char *sha1);
 636 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 637 extern const unsigned char null_sha1[20];
 638
 639 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 640 {
 641         int i;
 642
 643         for (i = 0; i < 20; i++, sha1++, sha2++) {
 644                 if (*sha1 != *sha2)
 645                         return *sha1 - *sha2;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static inline int is_null_sha1(const unsigned char *sha1)
 652 {
 653         return !hashcmp(sha1, null_sha1);
 654 }
 655
 656 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 657 {
 658         memcpy(sha_dst, sha_src, 20);
 659 }
 660 static inline void hashclr(unsigned char *hash)
 661 {
 662         memset(hash, 0, 20);
 663 }
 664
 665 #define EMPTY_TREE_SHA1_HEX \
 666         "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 667 #define EMPTY_TREE_SHA1_BIN_LITERAL \
 668          "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 669          "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 670 #define EMPTY_TREE_SHA1_BIN \
 671          ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
 672
 673 #define EMPTY_BLOB_SHA1_HEX \
 674         "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
 675 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
 676         "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
 677         "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
 678 #define EMPTY_BLOB_SHA1_BIN \
 679         ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
 680
 681 static inline int is_empty_blob_sha1(const unsigned char *sha1)
 682 {
 683         return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
 684 }
 685
 686 int git_mkstemp(char *path, size_t n, const char *template);
 687
 688 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 689
 690 /* set default permissions by passing mode arguments to open(2) */
 691 int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
 692 int git_mkstemp_mode(char *pattern, int mode);
 693
 694 /*
 695  * NOTE NOTE NOTE!!
 696  *
 697  * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 698  * not be changed. Old repositories have core.sharedrepository written in
 699  * numeric format, and therefore these values are preserved for compatibility
 700  * reasons.
 701  */
 702 enum sharedrepo {
 703         PERM_UMASK          = 0,
 704         OLD_PERM_GROUP      = 1,
 705         OLD_PERM_EVERYBODY  = 2,
 706         PERM_GROUP          = 0660,
 707         PERM_EVERYBODY      = 0664
 708 };
 709 int git_config_perm(const char *var, const char *value);
 710 int set_shared_perm(const char *path, int mode);
 711 #define adjust_shared_perm(path) set_shared_perm((path), 0)
 712 int safe_create_leading_directories(char *path);
 713 int safe_create_leading_directories_const(const char *path);
 714 int mkdir_in_gitdir(const char *path);
 715 extern void home_config_paths(char **global, char **xdg, char *file);
 716 extern char *expand_user_path(const char *path);
 717 const char *enter_repo(const char *path, int strict);
 718 static inline int is_absolute_path(const char *path)
 719 {
 720         return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
 721 }
 722 int is_directory(const char *);
 723 const char *real_path(const char *path);
 724 const char *real_path_if_valid(const char *path);
 725 const char *absolute_path(const char *path);
 726 const char *relative_path(const char *abs, const char *base);
 727 int normalize_path_copy(char *dst, const char *src);
 728 int longest_ancestor_length(const char *path, struct string_list *prefixes);
 729 char *strip_path_suffix(const char *path, const char *suffix);
 730 int daemon_avoid_alias(const char *path);
 731
 732 /* object replacement */
 733 #define READ_SHA1_FILE_REPLACE 1
 734 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
 735 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 736 {
 737         return read_sha1_file_extended(sha1, type, size, READ_SHA1_FILE_REPLACE);
 738 }
 739 extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
 740 static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
 741 {
 742         if (!read_replace_refs)
 743                 return sha1;
 744         return do_lookup_replace_object(sha1);
 745 }
 746
 747 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 748 extern int sha1_object_info(const unsigned char *, unsigned long *);
 749 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 750 extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 751 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 752 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 753 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
 754 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
 755 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
 756
 757 /* global flag to enable extra checks when accessing packed objects */
 758 extern int do_check_packed_object_crc;
 759
 760 /* for development: log offset of pack access */
 761 extern const char *log_pack_access;
 762
 763 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 764
 765 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 766
 767 extern int has_sha1_pack(const unsigned char *sha1);
 768 extern int has_sha1_file(const unsigned char *sha1);
 769 extern int has_loose_object_nonlocal(const unsigned char *sha1);
 770
 771 extern int has_pack_index(const unsigned char *sha1);
 772
 773 extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
 774
 775 extern const signed char hexval_table[256];
 776 static inline unsigned int hexval(unsigned char c)
 777 {
 778         return hexval_table[c];
 779 }
 780
 781 /* Convert to/from hex/sha1 representation */
 782 #define MINIMUM_ABBREV minimum_abbrev
 783 #define DEFAULT_ABBREV default_abbrev
 784
 785 struct object_context {
 786         unsigned char tree[20];
 787         char path[PATH_MAX];
 788         unsigned mode;
 789 };
 790
 791 #define GET_SHA1_QUIETLY        01
 792 #define GET_SHA1_COMMIT         02
 793 #define GET_SHA1_COMMITTISH     04
 794 #define GET_SHA1_TREE          010
 795 #define GET_SHA1_TREEISH       020
 796 #define GET_SHA1_BLOB          040
 797 #define GET_SHA1_ONLY_TO_DIE 04000
 798
 799 extern int get_sha1(const char *str, unsigned char *sha1);
 800 extern int get_sha1_commit(const char *str, unsigned char *sha1);
 801 extern int get_sha1_committish(const char *str, unsigned char *sha1);
 802 extern int get_sha1_tree(const char *str, unsigned char *sha1);
 803 extern int get_sha1_treeish(const char *str, unsigned char *sha1);
 804 extern int get_sha1_blob(const char *str, unsigned char *sha1);
 805 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
 806 extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
 807
 808 typedef int each_abbrev_fn(const unsigned char *sha1, void *);
 809 extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
 810
 811 /*
 812  * Try to read a SHA1 in hexadecimal format from the 40 characters
 813  * starting at hex.  Write the 20-byte result to sha1 in binary form.
 814  * Return 0 on success.  Reading stops if a NUL is encountered in the
 815  * input, so it is safe to pass this function an arbitrary
 816  * null-terminated string.
 817  */
 818 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 819
 820 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 821 extern int read_ref_full(const char *refname, unsigned char *sha1,
 822                          int reading, int *flags);
 823 extern int read_ref(const char *refname, unsigned char *sha1);
 824
 825 /*
 826  * Resolve a reference, recursively following symbolic refererences.
 827  *
 828  * Store the referred-to object's name in sha1 and return the name of
 829  * the non-symbolic reference that ultimately pointed at it.  The
 830  * return value, if not NULL, is a pointer into either a static buffer
 831  * or the input ref.
 832  *
 833  * If the reference cannot be resolved to an object, the behavior
 834  * depends on the "reading" argument:
 835  *
 836  * - If reading is set, return NULL.
 837  *
 838  * - If reading is not set, clear sha1 and return the name of the last
 839  *   reference name in the chain, which will either be a non-symbolic
 840  *   reference or an undefined reference.  If this is a prelude to
 841  *   "writing" to the ref, the return value is the name of the ref
 842  *   that will actually be created or changed.
 843  *
 844  * If flag is non-NULL, set the value that it points to the
 845  * combination of REF_ISPACKED (if the reference was found among the
 846  * packed references) and REF_ISSYMREF (if the initial reference was a
 847  * symbolic reference).
 848  *
 849  * If ref is not a properly-formatted, normalized reference, return
 850  * NULL.  If more than MAXDEPTH recursive symbolic lookups are needed,
 851  * give up and return NULL.
 852  *
 853  * errno is sometimes set on errors, but not always.
 854  */
 855 extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
 856 extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
 857
 858 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 859 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 860 extern int interpret_branch_name(const char *str, struct strbuf *);
 861 extern int get_sha1_mb(const char *str, unsigned char *sha1);
 862
 863 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 864 extern const char *ref_rev_parse_rules[];
 865 #define ref_fetch_rules ref_rev_parse_rules
 866
 867 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 868 extern int validate_headref(const char *ref);
 869
 870 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 871 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 872 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 873 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
 874
 875 extern void *read_object_with_reference(const unsigned char *sha1,
 876                                         const char *required_type,
 877                                         unsigned long *size,
 878                                         unsigned char *sha1_ret);
 879
 880 extern struct object *peel_to_type(const char *name, int namelen,
 881                                    struct object *o, enum object_type);
 882
 883 enum date_mode {
 884         DATE_NORMAL = 0,
 885         DATE_RELATIVE,
 886         DATE_SHORT,
 887         DATE_LOCAL,
 888         DATE_ISO8601,
 889         DATE_RFC2822,
 890         DATE_RAW
 891 };
 892
 893 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 894 void show_date_relative(unsigned long time, int tz, const struct timeval *now,
 895                         struct strbuf *timebuf);
 896 int parse_date(const char *date, char *buf, int bufsize);
 897 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
 898 void datestamp(char *buf, int bufsize);
 899 #define approxidate(s) approxidate_careful((s), NULL)
 900 unsigned long approxidate_careful(const char *, int *);
 901 unsigned long approxidate_relative(const char *date, const struct timeval *now);
 902 enum date_mode parse_date_format(const char *format);
 903
 904 #define IDENT_STRICT           1
 905 #define IDENT_NO_DATE          2
 906 #define IDENT_NO_NAME          4
 907 extern const char *git_author_info(int);
 908 extern const char *git_committer_info(int);
 909 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 910 extern const char *fmt_name(const char *name, const char *email);
 911 extern const char *ident_default_email(void);
 912 extern const char *git_editor(void);
 913 extern const char *git_pager(int stdout_is_tty);
 914 extern int git_ident_config(const char *, const char *, void *);
 915
 916 struct ident_split {
 917         const char *name_begin;
 918         const char *name_end;
 919         const char *mail_begin;
 920         const char *mail_end;
 921         const char *date_begin;
 922         const char *date_end;
 923         const char *tz_begin;
 924         const char *tz_end;
 925 };
 926 /*
 927  * Signals an success with 0, but time part of the result may be NULL
 928  * if the input lacks timestamp and zone
 929  */
 930 extern int split_ident_line(struct ident_split *, const char *, int);
 931
 932 struct checkout {
 933         const char *base_dir;
 934         int base_dir_len;
 935         unsigned force:1,
 936                  quiet:1,
 937                  not_new:1,
 938                  refresh_cache:1;
 939 };
 940
 941 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 942
 943 struct cache_def {
 944         char path[PATH_MAX + 1];
 945         int len;
 946         int flags;
 947         int track_flags;
 948         int prefix_len_stat_func;
 949 };
 950
 951 extern int has_symlink_leading_path(const char *name, int len);
 952 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 953 extern int check_leading_path(const char *name, int len);
 954 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
 955 extern void schedule_dir_for_removal(const char *name, int len);
 956 extern void remove_scheduled_dirs(void);
 957
 958 extern struct alternate_object_database {
 959         struct alternate_object_database *next;
 960         char *name;
 961         char base[FLEX_ARRAY]; /* more */
 962 } *alt_odb_list;
 963 extern void prepare_alt_odb(void);
 964 extern void read_info_alternates(const char * relative_base, int depth);
 965 extern void add_to_alternates_file(const char *reference);
 966 typedef int alt_odb_fn(struct alternate_object_database *, void *);
 967 extern void foreach_alt_odb(alt_odb_fn, void*);
 968
 969 struct pack_window {
 970         struct pack_window *next;
 971         unsigned char *base;
 972         off_t offset;
 973         size_t len;
 974         unsigned int last_used;
 975         unsigned int inuse_cnt;
 976 };
 977
 978 extern struct packed_git {
 979         struct packed_git *next;
 980         struct pack_window *windows;
 981         off_t pack_size;
 982         const void *index_data;
 983         size_t index_size;
 984         uint32_t num_objects;
 985         uint32_t num_bad_objects;
 986         unsigned char *bad_object_sha1;
 987         int index_version;
 988         time_t mtime;
 989         int pack_fd;
 990         unsigned pack_local:1,
 991                  pack_keep:1,
 992                  do_not_close:1;
 993         unsigned char sha1[20];
 994         /* something like ".git/objects/pack/xxxxx.pack" */
 995         char pack_name[FLEX_ARRAY]; /* more */
 996 } *packed_git;
 997
 998 struct pack_entry {
 999         off_t offset;
1000         unsigned char sha1[20];
1001         struct packed_git *p;
1002 };
1003
1004 struct ref {
1005         struct ref *next;
1006         unsigned char old_sha1[20];
1007         unsigned char new_sha1[20];
1008         char *symref;
1009         unsigned int force:1,
1010                 merge:1,
1011                 nonfastforward:1,
1012                 deletion:1;
1013         enum {
1014                 REF_STATUS_NONE = 0,
1015                 REF_STATUS_OK,
1016                 REF_STATUS_REJECT_NONFASTFORWARD,
1017                 REF_STATUS_REJECT_NODELETE,
1018                 REF_STATUS_UPTODATE,
1019                 REF_STATUS_REMOTE_REJECT,
1020                 REF_STATUS_EXPECTING_REPORT
1021         } status;
1022         char *remote_status;
1023         struct ref *peer_ref; /* when renaming */
1024         char name[FLEX_ARRAY]; /* more */
1025 };
1026
1027 #define REF_NORMAL      (1u << 0)
1028 #define REF_HEADS       (1u << 1)
1029 #define REF_TAGS        (1u << 2)
1030
1031 extern struct ref *find_ref_by_name(const struct ref *list, const char *name);
1032
1033 #define CONNECT_VERBOSE       (1u << 0)
1034 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
1035 extern int finish_connect(struct child_process *conn);
1036 extern int git_connection_is_socket(struct child_process *conn);
1037 struct extra_have_objects {
1038         int nr, alloc;
1039         unsigned char (*array)[20];
1040 };
1041 extern struct ref **get_remote_heads(int in, struct ref **list, unsigned int flags, struct extra_have_objects *);
1042 extern int server_supports(const char *feature);
1043 extern int parse_feature_request(const char *features, const char *feature);
1044 extern const char *server_feature_value(const char *feature, int *len_ret);
1045 extern const char *parse_feature_value(const char *feature_list, const char *feature, int *len_ret);
1046
1047 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1048
1049 extern void prepare_packed_git(void);
1050 extern void reprepare_packed_git(void);
1051 extern void install_packed_git(struct packed_git *pack);
1052
1053 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1054                                          struct packed_git *packs);
1055
1056 extern void pack_report(void);
1057 extern int open_pack_index(struct packed_git *);
1058 extern void close_pack_index(struct packed_git *);
1059 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1060 extern void close_pack_windows(struct packed_git *);
1061 extern void unuse_pack(struct pack_window **);
1062 extern void free_pack_by_name(const char *);
1063 extern void clear_delta_base_cache(void);
1064 extern struct packed_git *add_packed_git(const char *, int, int);
1065 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
1066 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
1067 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
1068 extern int is_pack_valid(struct packed_git *);
1069 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1070 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1071 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1072 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1073
1074 struct object_info {
1075         /* Request */
1076         unsigned long *sizep;
1077
1078         /* Response */
1079         enum {
1080                 OI_CACHED,
1081                 OI_LOOSE,
1082                 OI_PACKED,
1083                 OI_DBCACHED
1084         } whence;
1085         union {
1086                 /*
1087                  * struct {
1088                  *      ... Nothing to expose in this case
1089                  * } cached;
1090                  * struct {
1091                  *      ... Nothing to expose in this case
1092                  * } loose;
1093                  */
1094                 struct {
1095                         struct packed_git *pack;
1096                         off_t offset;
1097                         unsigned int is_delta;
1098                 } packed;
1099         } u;
1100 };
1101 extern int sha1_object_info_extended(const unsigned char *, struct object_info *);
1102
1103 /* Dumb servers support */
1104 extern int update_server_info(int);
1105
1106 /* git_config_parse_key() returns these negated: */
1107 #define CONFIG_INVALID_KEY 1
1108 #define CONFIG_NO_SECTION_OR_NAME 2
1109 /* git_config_set(), git_config_set_multivar() return the above or these: */
1110 #define CONFIG_NO_LOCK -1
1111 #define CONFIG_INVALID_FILE 3
1112 #define CONFIG_NO_WRITE 4
1113 #define CONFIG_NOTHING_SET 5
1114 #define CONFIG_INVALID_PATTERN 6
1115 #define CONFIG_GENERIC_ERROR 7
1116
1117 typedef int (*config_fn_t)(const char *, const char *, void *);
1118 extern int git_default_config(const char *, const char *, void *);
1119 extern int git_config_from_file(config_fn_t fn, const char *, void *);
1120 extern void git_config_push_parameter(const char *text);
1121 extern int git_config_from_parameters(config_fn_t fn, void *data);
1122 extern int git_config(config_fn_t fn, void *);
1123 extern int git_config_with_options(config_fn_t fn, void *,
1124                                    const char *filename, int respect_includes);
1125 extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
1126 extern int git_parse_ulong(const char *, unsigned long *);
1127 extern int git_config_int(const char *, const char *);
1128 extern unsigned long git_config_ulong(const char *, const char *);
1129 extern int git_config_bool_or_int(const char *, const char *, int *);
1130 extern int git_config_bool(const char *, const char *);
1131 extern int git_config_maybe_bool(const char *, const char *);
1132 extern int git_config_string(const char **, const char *, const char *);
1133 extern int git_config_pathname(const char **, const char *, const char *);
1134 extern int git_config_set_in_file(const char *, const char *, const char *);
1135 extern int git_config_set(const char *, const char *);
1136 extern int git_config_parse_key(const char *, char **, int *);
1137 extern int git_config_set_multivar(const char *, const char *, const char *, int);
1138 extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1139 extern int git_config_rename_section(const char *, const char *);
1140 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1141 extern const char *git_etc_gitconfig(void);
1142 extern int check_repository_format_version(const char *var, const char *value, void *cb);
1143 extern int git_env_bool(const char *, int);
1144 extern int git_config_system(void);
1145 extern int config_error_nonbool(const char *);
1146 extern const char *get_log_output_encoding(void);
1147 extern const char *get_commit_output_encoding(void);
1148
1149 extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1150
1151 struct config_include_data {
1152         int depth;
1153         config_fn_t fn;
1154         void *data;
1155 };
1156 #define CONFIG_INCLUDE_INIT { 0 }
1157 extern int git_config_include(const char *name, const char *value, void *data);
1158
1159 extern int committer_ident_sufficiently_given(void);
1160 extern int author_ident_sufficiently_given(void);
1161
1162 extern const char *git_commit_encoding;
1163 extern const char *git_log_output_encoding;
1164 extern const char *git_mailmap_file;
1165
1166 /* IO helper functions */
1167 extern void maybe_flush_or_die(FILE *, const char *);
1168 extern int copy_fd(int ifd, int ofd);
1169 extern int copy_file(const char *dst, const char *src, int mode);
1170 extern int copy_file_with_time(const char *dst, const char *src, int mode);
1171 extern void write_or_die(int fd, const void *buf, size_t count);
1172 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1173 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1174 extern void fsync_or_die(int fd, const char *);
1175
1176 extern ssize_t read_in_full(int fd, void *buf, size_t count);
1177 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1178 static inline ssize_t write_str_in_full(int fd, const char *str)
1179 {
1180         return write_in_full(fd, str, strlen(str));
1181 }
1182
1183 /* pager.c */
1184 extern void setup_pager(void);
1185 extern const char *pager_program;
1186 extern int pager_in_use(void);
1187 extern int pager_use_color;
1188 extern int term_columns(void);
1189 extern int decimal_width(int);
1190 extern int check_pager_config(const char *cmd);
1191
1192 extern const char *editor_program;
1193 extern const char *askpass_program;
1194 extern const char *excludes_file;
1195
1196 /* base85 */
1197 int decode_85(char *dst, const char *line, int linelen);
1198 void encode_85(char *buf, const unsigned char *data, int bytes);
1199
1200 /* alloc.c */
1201 extern void *alloc_blob_node(void);
1202 extern void *alloc_tree_node(void);
1203 extern void *alloc_commit_node(void);
1204 extern void *alloc_tag_node(void);
1205 extern void *alloc_object_node(void);
1206 extern void alloc_report(void);
1207
1208 /* trace.c */
1209 __attribute__((format (printf, 1, 2)))
1210 extern void trace_printf(const char *format, ...);
1211 __attribute__((format (printf, 2, 3)))
1212 extern void trace_argv_printf(const char **argv, const char *format, ...);
1213 extern void trace_repo_setup(const char *prefix);
1214 extern int trace_want(const char *key);
1215 extern void trace_strbuf(const char *key, const struct strbuf *buf);
1216
1217 void packet_trace_identity(const char *prog);
1218
1219 /* add */
1220 /*
1221  * return 0 if success, 1 - if addition of a file failed and
1222  * ADD_FILES_IGNORE_ERRORS was specified in flags
1223  */
1224 int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
1225
1226 /* diff.c */
1227 extern int diff_auto_refresh_index;
1228
1229 /* match-trees.c */
1230 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1231 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1232
1233 /*
1234  * whitespace rules.
1235  * used by both diff and apply
1236  * last two digits are tab width
1237  */
1238 #define WS_BLANK_AT_EOL         0100
1239 #define WS_SPACE_BEFORE_TAB     0200
1240 #define WS_INDENT_WITH_NON_TAB  0400
1241 #define WS_CR_AT_EOL           01000
1242 #define WS_BLANK_AT_EOF        02000
1243 #define WS_TAB_IN_INDENT       04000
1244 #define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1245 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1246 #define WS_TAB_WIDTH_MASK        077
1247 extern unsigned whitespace_rule_cfg;
1248 extern unsigned whitespace_rule(const char *);
1249 extern unsigned parse_whitespace_rule(const char *);
1250 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1251 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1252 extern char *whitespace_error_string(unsigned ws);
1253 extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1254 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1255 #define ws_tab_width(rule)     ((rule) & WS_TAB_WIDTH_MASK)
1256
1257 /* ls-files */
1258 int report_path_error(const char *ps_matched, const char **pathspec, const char *prefix);
1259 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1260
1261 char *alias_lookup(const char *alias);
1262 int split_cmdline(char *cmdline, const char ***argv);
1263 /* Takes a negative value returned by split_cmdline */
1264 const char *split_cmdline_strerror(int cmdline_errno);
1265
1266 /* git.c */
1267 struct startup_info {
1268         int have_repository;
1269         const char *prefix;
1270 };
1271 extern struct startup_info *startup_info;
1272
1273 /* merge.c */
1274 struct commit_list;
1275 int try_merge_command(const char *strategy, size_t xopts_nr,
1276                 const char **xopts, struct commit_list *common,
1277                 const char *head_arg, struct commit_list *remotes);
1278 int checkout_fast_forward(const unsigned char *from,
1279                           const unsigned char *to,
1280                           int overwrite_ignore);
1281
1282
1283 int sane_execvp(const char *file, char *const argv[]);
1284
1285 #endif /* CACHE_H */