cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5 #include "strbuf.h"
   6 #include "hashmap.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_init_raw(git_zstream *, int level);
  38 void git_deflate_end(git_zstream *);
  39 int git_deflate_abort(git_zstream *);
  40 int git_deflate_end_gently(git_zstream *);
  41 int git_deflate(git_zstream *, int flush);
  42 unsigned long git_deflate_bound(git_zstream *, unsigned long);
  43
  44 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  45 #define DTYPE(de)       ((de)->d_type)
  46 #else
  47 #undef DT_UNKNOWN
  48 #undef DT_DIR
  49 #undef DT_REG
  50 #undef DT_LNK
  51 #define DT_UNKNOWN      0
  52 #define DT_DIR          1
  53 #define DT_REG          2
  54 #define DT_LNK          3
  55 #define DTYPE(de)       DT_UNKNOWN
  56 #endif
  57
  58 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  59 #define S_IFINVALID     0030000
  60
  61 /*
  62  * A "directory link" is a link to another git directory.
  63  *
  64  * The value 0160000 is not normally a valid mode, and
  65  * also just happens to be S_IFDIR + S_IFLNK
  66  *
  67  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  68  * always having the same values everywhere. We should use
  69  * our internal git values for these things, and then we can
  70  * translate that to the OS-specific value. It just so
  71  * happens that everybody shares the same bit representation
  72  * in the UNIX world (and apparently wider too..)
  73  */
  74 #define S_IFGITLINK     0160000
  75 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  76
  77 /*
  78  * Intensive research over the course of many years has shown that
  79  * port 9418 is totally unused by anything else. Or
  80  *
  81  *      Your search - "port 9418" - did not match any documents.
  82  *
  83  * as www.google.com puts it.
  84  *
  85  * This port has been properly assigned for git use by IANA:
  86  * git (Assigned-9418) [I06-050728-0001].
  87  *
  88  *      git  9418/tcp   git pack transfer service
  89  *      git  9418/udp   git pack transfer service
  90  *
  91  * with Linus Torvalds <torvalds@osdl.org> as the point of
  92  * contact. September 2005.
  93  *
  94  * See http://www.iana.org/assignments/port-numbers
  95  */
  96 #define DEFAULT_GIT_PORT 9418
  97
  98 /*
  99  * Basic data structures for the directory cache
 100  */
 101
 102 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
 103 struct cache_header {
 104         uint32_t hdr_signature;
 105         uint32_t hdr_version;
 106         uint32_t hdr_entries;
 107 };
 108
 109 #define INDEX_FORMAT_LB 2
 110 #define INDEX_FORMAT_UB 4
 111
 112 /*
 113  * The "cache_time" is just the low 32 bits of the
 114  * time. It doesn't matter if it overflows - we only
 115  * check it for equality in the 32 bits we save.
 116  */
 117 struct cache_time {
 118         uint32_t sec;
 119         uint32_t nsec;
 120 };
 121
 122 struct stat_data {
 123         struct cache_time sd_ctime;
 124         struct cache_time sd_mtime;
 125         unsigned int sd_dev;
 126         unsigned int sd_ino;
 127         unsigned int sd_uid;
 128         unsigned int sd_gid;
 129         unsigned int sd_size;
 130 };
 131
 132 struct cache_entry {
 133         struct hashmap_entry ent;
 134         struct stat_data ce_stat_data;
 135         unsigned int ce_mode;
 136         unsigned int ce_flags;
 137         unsigned int ce_namelen;
 138         unsigned char sha1[20];
 139         char name[FLEX_ARRAY]; /* more */
 140 };
 141
 142 #define CE_STAGEMASK (0x3000)
 143 #define CE_EXTENDED  (0x4000)
 144 #define CE_VALID     (0x8000)
 145 #define CE_STAGESHIFT 12
 146
 147 /*
 148  * Range 0xFFFF0000 in ce_flags is divided into
 149  * two parts: in-memory flags and on-disk ones.
 150  * Flags in CE_EXTENDED_FLAGS will get saved on-disk
 151  * if you want to save a new flag, add it in
 152  * CE_EXTENDED_FLAGS
 153  *
 154  * In-memory only flags
 155  */
 156 #define CE_UPDATE            (1 << 16)
 157 #define CE_REMOVE            (1 << 17)
 158 #define CE_UPTODATE          (1 << 18)
 159 #define CE_ADDED             (1 << 19)
 160
 161 #define CE_HASHED            (1 << 20)
 162 #define CE_WT_REMOVE         (1 << 22) /* remove in work directory */
 163 #define CE_CONFLICTED        (1 << 23)
 164
 165 #define CE_UNPACKED          (1 << 24)
 166 #define CE_NEW_SKIP_WORKTREE (1 << 25)
 167
 168 /* used to temporarily mark paths matched by pathspecs */
 169 #define CE_MATCHED           (1 << 26)
 170
 171 /*
 172  * Extended on-disk flags
 173  */
 174 #define CE_INTENT_TO_ADD     (1 << 29)
 175 #define CE_SKIP_WORKTREE     (1 << 30)
 176 /* CE_EXTENDED2 is for future extension */
 177 #define CE_EXTENDED2         (1 << 31)
 178
 179 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
 180
 181 /*
 182  * Safeguard to avoid saving wrong flags:
 183  *  - CE_EXTENDED2 won't get saved until its semantic is known
 184  *  - Bits in 0x0000FFFF have been saved in ce_flags already
 185  *  - Bits in 0x003F0000 are currently in-memory flags
 186  */
 187 #if CE_EXTENDED_FLAGS & 0x803FFFFF
 188 #error "CE_EXTENDED_FLAGS out of range"
 189 #endif
 190
 191 struct pathspec;
 192
 193 /*
 194  * Copy the sha1 and stat state of a cache entry from one to
 195  * another. But we never change the name, or the hash state!
 196  */
 197 static inline void copy_cache_entry(struct cache_entry *dst,
 198                                     const struct cache_entry *src)
 199 {
 200         unsigned int state = dst->ce_flags & CE_HASHED;
 201
 202         /* Don't copy hash chain and name */
 203         memcpy(&dst->ce_stat_data, &src->ce_stat_data,
 204                         offsetof(struct cache_entry, name) -
 205                         offsetof(struct cache_entry, ce_stat_data));
 206
 207         /* Restore the hash state */
 208         dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
 209 }
 210
 211 static inline unsigned create_ce_flags(unsigned stage)
 212 {
 213         return (stage << CE_STAGESHIFT);
 214 }
 215
 216 #define ce_namelen(ce) ((ce)->ce_namelen)
 217 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 218 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 219 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 220 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
 221 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 222
 223 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 224 static inline unsigned int create_ce_mode(unsigned int mode)
 225 {
 226         if (S_ISLNK(mode))
 227                 return S_IFLNK;
 228         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 229                 return S_IFGITLINK;
 230         return S_IFREG | ce_permissions(mode);
 231 }
 232 static inline unsigned int ce_mode_from_stat(const struct cache_entry *ce,
 233                                              unsigned int mode)
 234 {
 235         extern int trust_executable_bit, has_symlinks;
 236         if (!has_symlinks && S_ISREG(mode) &&
 237             ce && S_ISLNK(ce->ce_mode))
 238                 return ce->ce_mode;
 239         if (!trust_executable_bit && S_ISREG(mode)) {
 240                 if (ce && S_ISREG(ce->ce_mode))
 241                         return ce->ce_mode;
 242                 return create_ce_mode(0666);
 243         }
 244         return create_ce_mode(mode);
 245 }
 246 static inline int ce_to_dtype(const struct cache_entry *ce)
 247 {
 248         unsigned ce_mode = ntohl(ce->ce_mode);
 249         if (S_ISREG(ce_mode))
 250                 return DT_REG;
 251         else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
 252                 return DT_DIR;
 253         else if (S_ISLNK(ce_mode))
 254                 return DT_LNK;
 255         else
 256                 return DT_UNKNOWN;
 257 }
 258 static inline unsigned int canon_mode(unsigned int mode)
 259 {
 260         if (S_ISREG(mode))
 261                 return S_IFREG | ce_permissions(mode);
 262         if (S_ISLNK(mode))
 263                 return S_IFLNK;
 264         if (S_ISDIR(mode))
 265                 return S_IFDIR;
 266         return S_IFGITLINK;
 267 }
 268
 269 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
 270
 271 struct index_state {
 272         struct cache_entry **cache;
 273         unsigned int version;
 274         unsigned int cache_nr, cache_alloc, cache_changed;
 275         struct string_list *resolve_undo;
 276         struct cache_tree *cache_tree;
 277         struct cache_time timestamp;
 278         unsigned name_hash_initialized : 1,
 279                  initialized : 1;
 280         struct hashmap name_hash;
 281         struct hashmap dir_hash;
 282         unsigned char sha1[20];
 283 };
 284
 285 extern struct index_state the_index;
 286
 287 /* Name hashing */
 288 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 289 extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
 290 extern void free_name_hash(struct index_state *istate);
 291
 292
 293 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 294 #define active_cache (the_index.cache)
 295 #define active_nr (the_index.cache_nr)
 296 #define active_alloc (the_index.cache_alloc)
 297 #define active_cache_changed (the_index.cache_changed)
 298 #define active_cache_tree (the_index.cache_tree)
 299
 300 #define read_cache() read_index(&the_index)
 301 #define read_cache_from(path) read_index_from(&the_index, (path))
 302 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 303 #define is_cache_unborn() is_index_unborn(&the_index)
 304 #define read_cache_unmerged() read_index_unmerged(&the_index)
 305 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 306 #define discard_cache() discard_index(&the_index)
 307 #define unmerged_cache() unmerged_index(&the_index)
 308 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 309 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 310 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 311 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 312 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 313 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 314 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 315 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
 316 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 317 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 318 #define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
 319 #define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
 320 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
 321 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
 322 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
 323 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
 324 #define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
 325 #endif
 326
 327 enum object_type {
 328         OBJ_BAD = -1,
 329         OBJ_NONE = 0,
 330         OBJ_COMMIT = 1,
 331         OBJ_TREE = 2,
 332         OBJ_BLOB = 3,
 333         OBJ_TAG = 4,
 334         /* 5 for future expansion */
 335         OBJ_OFS_DELTA = 6,
 336         OBJ_REF_DELTA = 7,
 337         OBJ_ANY,
 338         OBJ_MAX
 339 };
 340
 341 static inline enum object_type object_type(unsigned int mode)
 342 {
 343         return S_ISDIR(mode) ? OBJ_TREE :
 344                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 345                 OBJ_BLOB;
 346 }
 347
 348 /* Double-check local_repo_env below if you add to this list. */
 349 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 350 #define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
 351 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 352 #define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
 353 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 354 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 355 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 356 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 357 #define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
 358 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 359 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 360 #define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
 361 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 362 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 363 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
 364 #define GITATTRIBUTES_FILE ".gitattributes"
 365 #define INFOATTRIBUTES_FILE "info/attributes"
 366 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 367 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 368 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 369 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
 370 #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
 371 #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
 372 #define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
 373 #define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
 374 #define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
 375 #define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
 376
 377 /*
 378  * This environment variable is expected to contain a boolean indicating
 379  * whether we should or should not treat:
 380  *
 381  *   GIT_DIR=foo.git git ...
 382  *
 383  * as if GIT_WORK_TREE=. was given. It's not expected that users will make use
 384  * of this, but we use it internally to communicate to sub-processes that we
 385  * are in a bare repo. If not set, defaults to true.
 386  */
 387 #define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
 388
 389 /*
 390  * Repository-local GIT_* environment variables; these will be cleared
 391  * when git spawns a sub-process that runs inside another repository.
 392  * The array is NULL-terminated, which makes it easy to pass in the "env"
 393  * parameter of a run-command invocation, or to do a simple walk.
 394  */
 395 extern const char * const local_repo_env[];
 396
 397 extern int is_bare_repository_cfg;
 398 extern int is_bare_repository(void);
 399 extern int is_inside_git_dir(void);
 400 extern char *git_work_tree_cfg;
 401 extern int is_inside_work_tree(void);
 402 extern const char *get_git_dir(void);
 403 extern int is_git_directory(const char *path);
 404 extern char *get_object_directory(void);
 405 extern char *get_index_file(void);
 406 extern char *get_graft_file(void);
 407 extern int set_git_dir(const char *path);
 408 extern const char *get_git_namespace(void);
 409 extern const char *strip_namespace(const char *namespaced_ref);
 410 extern const char *get_git_work_tree(void);
 411 extern const char *read_gitfile(const char *path);
 412 extern const char *resolve_gitdir(const char *suspect);
 413 extern void set_git_work_tree(const char *tree);
 414
 415 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 416
 417 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 418 extern void setup_work_tree(void);
 419 extern const char *setup_git_directory_gently(int *);
 420 extern const char *setup_git_directory(void);
 421 extern char *prefix_path(const char *prefix, int len, const char *path);
 422 extern char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
 423 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 424 extern int check_filename(const char *prefix, const char *name);
 425 extern void verify_filename(const char *prefix,
 426                             const char *name,
 427                             int diagnose_misspelt_rev);
 428 extern void verify_non_filename(const char *prefix, const char *name);
 429 extern int path_inside_repo(const char *prefix, const char *path);
 430
 431 #define INIT_DB_QUIET 0x0001
 432
 433 extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
 434 extern int init_db(const char *template_dir, unsigned int flags);
 435
 436 extern void sanitize_stdfds(void);
 437 extern int daemonize(void);
 438
 439 #define alloc_nr(x) (((x)+16)*3/2)
 440
 441 /*
 442  * Realloc the buffer pointed at by variable 'x' so that it can hold
 443  * at least 'nr' entries; the number of entries currently allocated
 444  * is 'alloc', using the standard growing factor alloc_nr() macro.
 445  *
 446  * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
 447  */
 448 #define ALLOC_GROW(x, nr, alloc) \
 449         do { \
 450                 if ((nr) > alloc) { \
 451                         if (alloc_nr(alloc) < (nr)) \
 452                                 alloc = (nr); \
 453                         else \
 454                                 alloc = alloc_nr(alloc); \
 455                         x = xrealloc((x), alloc * sizeof(*(x))); \
 456                 } \
 457         } while (0)
 458
 459 /* Initialize and use the cache information */
 460 extern int read_index(struct index_state *);
 461 extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
 462 extern int read_index_from(struct index_state *, const char *path);
 463 extern int is_index_unborn(struct index_state *);
 464 extern int read_index_unmerged(struct index_state *);
 465 extern int write_index(struct index_state *, int newfd);
 466 extern int discard_index(struct index_state *);
 467 extern int unmerged_index(const struct index_state *);
 468 extern int verify_path(const char *path);
 469 extern struct cache_entry *index_dir_exists(struct index_state *istate, const char *name, int namelen);
 470 extern struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 471 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
 472 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 473 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 474 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 475 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 476 #define ADD_CACHE_NEW_ONLY 16           /* Do not replace existing ones */
 477 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 478 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 479 extern int remove_index_entry_at(struct index_state *, int pos);
 480 extern void remove_marked_cache_entries(struct index_state *istate);
 481 extern int remove_file_from_index(struct index_state *, const char *path);
 482 #define ADD_CACHE_VERBOSE 1
 483 #define ADD_CACHE_PRETEND 2
 484 #define ADD_CACHE_IGNORE_ERRORS 4
 485 #define ADD_CACHE_IGNORE_REMOVAL 8
 486 #define ADD_CACHE_INTENT 16
 487 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 488 extern int add_file_to_index(struct index_state *, const char *path, int flags);
 489 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, unsigned int refresh_options);
 490 extern int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
 491 extern void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
 492 extern int index_name_is_other(const struct index_state *, const char *, int);
 493 extern void *read_blob_data_from_index(struct index_state *, const char *, unsigned long *);
 494
 495 /* do stat comparison even if CE_VALID is true */
 496 #define CE_MATCH_IGNORE_VALID           01
 497 /* do not check the contents but report dirty on racily-clean entries */
 498 #define CE_MATCH_RACY_IS_DIRTY          02
 499 /* do stat comparison even if CE_SKIP_WORKTREE is true */
 500 #define CE_MATCH_IGNORE_SKIP_WORKTREE   04
 501 /* ignore non-existent files during stat update  */
 502 #define CE_MATCH_IGNORE_MISSING         0x08
 503 /* enable stat refresh */
 504 #define CE_MATCH_REFRESH                0x10
 505 extern int ie_match_stat(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
 506 extern int ie_modified(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
 507
 508 #define HASH_WRITE_OBJECT 1
 509 #define HASH_FORMAT_CHECK 2
 510 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
 511 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
 512
 513 /*
 514  * Record to sd the data from st that we use to check whether a file
 515  * might have changed.
 516  */
 517 extern void fill_stat_data(struct stat_data *sd, struct stat *st);
 518
 519 /*
 520  * Return 0 if st is consistent with a file not having been changed
 521  * since sd was filled.  If there are differences, return a
 522  * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
 523  * INODE_CHANGED, and DATA_CHANGED.
 524  */
 525 extern int match_stat_data(const struct stat_data *sd, struct stat *st);
 526
 527 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 528
 529 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 530 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 531 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 532 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 533 #define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 534 #define REFRESH_IN_PORCELAIN    0x0020  /* user friendly output, not "needs update" */
 535 extern int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
 536
 537 struct lock_file {
 538         struct lock_file *next;
 539         int fd;
 540         pid_t owner;
 541         char on_list;
 542         char filename[PATH_MAX];
 543 };
 544 #define LOCK_DIE_ON_ERROR 1
 545 #define LOCK_NODEREF 2
 546 extern int unable_to_lock_error(const char *path, int err);
 547 extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 548 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 549 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 550 extern int commit_lock_file(struct lock_file *);
 551 extern void update_index_if_able(struct index_state *, struct lock_file *);
 552
 553 extern int hold_locked_index(struct lock_file *, int);
 554 extern int commit_locked_index(struct lock_file *);
 555 extern void set_alternate_index_output(const char *);
 556 extern int close_lock_file(struct lock_file *);
 557 extern void rollback_lock_file(struct lock_file *);
 558 extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 559
 560 /* Environment bits from configuration mechanism */
 561 extern int trust_executable_bit;
 562 extern int trust_ctime;
 563 extern int check_stat;
 564 extern int quote_path_fully;
 565 extern int has_symlinks;
 566 extern int minimum_abbrev, default_abbrev;
 567 extern int ignore_case;
 568 extern int assume_unchanged;
 569 extern int prefer_symlink_refs;
 570 extern int log_all_ref_updates;
 571 extern int warn_ambiguous_refs;
 572 extern int warn_on_object_refname_ambiguity;
 573 extern int shared_repository;
 574 extern const char *apply_default_whitespace;
 575 extern const char *apply_default_ignorewhitespace;
 576 extern const char *git_attributes_file;
 577 extern int zlib_compression_level;
 578 extern int core_compression_level;
 579 extern int core_compression_seen;
 580 extern size_t packed_git_window_size;
 581 extern size_t packed_git_limit;
 582 extern size_t delta_base_cache_limit;
 583 extern unsigned long big_file_threshold;
 584 extern unsigned long pack_size_limit_cfg;
 585
 586 /*
 587  * Do replace refs need to be checked this run?  This variable is
 588  * initialized to true unless --no-replace-object is used or
 589  * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
 590  * commands that do not want replace references to be active.  As an
 591  * optimization it is also set to false if replace references have
 592  * been sought but there were none.
 593  */
 594 extern int check_replace_refs;
 595
 596 extern int fsync_object_files;
 597 extern int core_preload_index;
 598 extern int core_apply_sparse_checkout;
 599 extern int precomposed_unicode;
 600 extern int protect_hfs;
 601 extern int protect_ntfs;
 602
 603 /*
 604  * The character that begins a commented line in user-editable file
 605  * that is subject to stripspace.
 606  */
 607 extern char comment_line_char;
 608
 609 enum branch_track {
 610         BRANCH_TRACK_UNSPECIFIED = -1,
 611         BRANCH_TRACK_NEVER = 0,
 612         BRANCH_TRACK_REMOTE,
 613         BRANCH_TRACK_ALWAYS,
 614         BRANCH_TRACK_EXPLICIT,
 615         BRANCH_TRACK_OVERRIDE
 616 };
 617
 618 enum rebase_setup_type {
 619         AUTOREBASE_NEVER = 0,
 620         AUTOREBASE_LOCAL,
 621         AUTOREBASE_REMOTE,
 622         AUTOREBASE_ALWAYS
 623 };
 624
 625 enum push_default_type {
 626         PUSH_DEFAULT_NOTHING = 0,
 627         PUSH_DEFAULT_MATCHING,
 628         PUSH_DEFAULT_SIMPLE,
 629         PUSH_DEFAULT_UPSTREAM,
 630         PUSH_DEFAULT_CURRENT,
 631         PUSH_DEFAULT_UNSPECIFIED
 632 };
 633
 634 extern enum branch_track git_branch_track;
 635 extern enum rebase_setup_type autorebase;
 636 extern enum push_default_type push_default;
 637
 638 enum object_creation_mode {
 639         OBJECT_CREATION_USES_HARDLINKS = 0,
 640         OBJECT_CREATION_USES_RENAMES = 1
 641 };
 642
 643 extern enum object_creation_mode object_creation_mode;
 644
 645 extern char *notes_ref_name;
 646
 647 extern int grafts_replace_parents;
 648
 649 #define GIT_REPO_VERSION 0
 650 extern int repository_format_version;
 651 extern int check_repository_format(void);
 652
 653 #define MTIME_CHANGED   0x0001
 654 #define CTIME_CHANGED   0x0002
 655 #define OWNER_CHANGED   0x0004
 656 #define MODE_CHANGED    0x0008
 657 #define INODE_CHANGED   0x0010
 658 #define DATA_CHANGED    0x0020
 659 #define TYPE_CHANGED    0x0040
 660
 661 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 662         __attribute__((format (printf, 3, 4)));
 663 extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 664         __attribute__((format (printf, 3, 4)));
 665 extern char *git_pathdup(const char *fmt, ...)
 666         __attribute__((format (printf, 1, 2)));
 667 extern char *mkpathdup(const char *fmt, ...)
 668         __attribute__((format (printf, 1, 2)));
 669
 670 /* Return a statically allocated filename matching the sha1 signature */
 671 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 672 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 673 extern char *git_path_submodule(const char *path, const char *fmt, ...)
 674         __attribute__((format (printf, 2, 3)));
 675
 676 /*
 677  * Return the name of the file in the local object database that would
 678  * be used to store a loose object with the specified sha1.  The
 679  * return value is a pointer to a statically allocated buffer that is
 680  * overwritten each time the function is called.
 681  */
 682 extern const char *sha1_file_name(const unsigned char *sha1);
 683
 684 /*
 685  * Return the name of the (local) packfile with the specified sha1 in
 686  * its name.  The return value is a pointer to memory that is
 687  * overwritten each time this function is called.
 688  */
 689 extern char *sha1_pack_name(const unsigned char *sha1);
 690
 691 /*
 692  * Return the name of the (local) pack index file with the specified
 693  * sha1 in its name.  The return value is a pointer to memory that is
 694  * overwritten each time this function is called.
 695  */
 696 extern char *sha1_pack_index_name(const unsigned char *sha1);
 697
 698 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 699 extern const unsigned char null_sha1[20];
 700
 701 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 702 {
 703         int i;
 704
 705         for (i = 0; i < 20; i++, sha1++, sha2++) {
 706                 if (*sha1 != *sha2)
 707                         return *sha1 - *sha2;
 708         }
 709
 710         return 0;
 711 }
 712
 713 static inline int is_null_sha1(const unsigned char *sha1)
 714 {
 715         return !hashcmp(sha1, null_sha1);
 716 }
 717
 718 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 719 {
 720         memcpy(sha_dst, sha_src, 20);
 721 }
 722 static inline void hashclr(unsigned char *hash)
 723 {
 724         memset(hash, 0, 20);
 725 }
 726
 727 #define EMPTY_TREE_SHA1_HEX \
 728         "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 729 #define EMPTY_TREE_SHA1_BIN_LITERAL \
 730          "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 731          "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 732 #define EMPTY_TREE_SHA1_BIN \
 733          ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
 734
 735 #define EMPTY_BLOB_SHA1_HEX \
 736         "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
 737 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
 738         "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
 739         "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
 740 #define EMPTY_BLOB_SHA1_BIN \
 741         ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
 742
 743 static inline int is_empty_blob_sha1(const unsigned char *sha1)
 744 {
 745         return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
 746 }
 747
 748 int git_mkstemp(char *path, size_t n, const char *template);
 749
 750 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 751
 752 /* set default permissions by passing mode arguments to open(2) */
 753 int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
 754 int git_mkstemp_mode(char *pattern, int mode);
 755
 756 /*
 757  * NOTE NOTE NOTE!!
 758  *
 759  * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 760  * not be changed. Old repositories have core.sharedrepository written in
 761  * numeric format, and therefore these values are preserved for compatibility
 762  * reasons.
 763  */
 764 enum sharedrepo {
 765         PERM_UMASK          = 0,
 766         OLD_PERM_GROUP      = 1,
 767         OLD_PERM_EVERYBODY  = 2,
 768         PERM_GROUP          = 0660,
 769         PERM_EVERYBODY      = 0664
 770 };
 771 int git_config_perm(const char *var, const char *value);
 772 int adjust_shared_perm(const char *path);
 773
 774 /*
 775  * Create the directory containing the named path, using care to be
 776  * somewhat safe against races.  Return one of the scld_error values
 777  * to indicate success/failure.
 778  *
 779  * SCLD_VANISHED indicates that one of the ancestor directories of the
 780  * path existed at one point during the function call and then
 781  * suddenly vanished, probably because another process pruned the
 782  * directory while we were working.  To be robust against this kind of
 783  * race, callers might want to try invoking the function again when it
 784  * returns SCLD_VANISHED.
 785  */
 786 enum scld_error {
 787         SCLD_OK = 0,
 788         SCLD_FAILED = -1,
 789         SCLD_PERMS = -2,
 790         SCLD_EXISTS = -3,
 791         SCLD_VANISHED = -4
 792 };
 793 enum scld_error safe_create_leading_directories(char *path);
 794 enum scld_error safe_create_leading_directories_const(const char *path);
 795
 796 int mkdir_in_gitdir(const char *path);
 797 extern void home_config_paths(char **global, char **xdg, char *file);
 798 extern char *expand_user_path(const char *path);
 799 const char *enter_repo(const char *path, int strict);
 800 static inline int is_absolute_path(const char *path)
 801 {
 802         return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
 803 }
 804 int is_directory(const char *);
 805 const char *real_path(const char *path);
 806 const char *real_path_if_valid(const char *path);
 807 const char *absolute_path(const char *path);
 808 const char *remove_leading_path(const char *in, const char *prefix);
 809 const char *relative_path(const char *in, const char *prefix, struct strbuf *sb);
 810 int normalize_path_copy_len(char *dst, const char *src, int *prefix_len);
 811 int normalize_path_copy(char *dst, const char *src);
 812 int longest_ancestor_length(const char *path, struct string_list *prefixes);
 813 char *strip_path_suffix(const char *path, const char *suffix);
 814 int daemon_avoid_alias(const char *path);
 815 int offset_1st_component(const char *path);
 816 extern int is_ntfs_dotgit(const char *name);
 817
 818 /* object replacement */
 819 #define LOOKUP_REPLACE_OBJECT 1
 820 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
 821 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 822 {
 823         return read_sha1_file_extended(sha1, type, size, LOOKUP_REPLACE_OBJECT);
 824 }
 825
 826 /*
 827  * This internal function is only declared here for the benefit of
 828  * lookup_replace_object().  Please do not call it directly.
 829  */
 830 extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
 831
 832 /*
 833  * If object sha1 should be replaced, return the replacement object's
 834  * name (replaced recursively, if necessary).  The return value is
 835  * either sha1 or a pointer to a permanently-allocated value.  When
 836  * object replacement is suppressed, always return sha1.
 837  */
 838 static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
 839 {
 840         if (!check_replace_refs)
 841                 return sha1;
 842         return do_lookup_replace_object(sha1);
 843 }
 844
 845 static inline const unsigned char *lookup_replace_object_extended(const unsigned char *sha1, unsigned flag)
 846 {
 847         if (!(flag & LOOKUP_REPLACE_OBJECT))
 848                 return sha1;
 849         return lookup_replace_object(sha1);
 850 }
 851
 852 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 853 extern int sha1_object_info(const unsigned char *, unsigned long *);
 854 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 855 extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 856 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 857 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 858 extern int git_open_noatime(const char *name);
 859 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
 860 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
 861 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
 862
 863 /* global flag to enable extra checks when accessing packed objects */
 864 extern int do_check_packed_object_crc;
 865
 866 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 867
 868 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 869
 870 extern int has_sha1_pack(const unsigned char *sha1);
 871
 872 /*
 873  * Return true iff we have an object named sha1, whether local or in
 874  * an alternate object database, and whether packed or loose.  This
 875  * function does not respect replace references.
 876  *
 877  * If the QUICK flag is set, do not re-check the pack directory
 878  * when we cannot find the object (this means we may give a false
 879  * negative answer if another process is simultaneously repacking).
 880  */
 881 #define HAS_SHA1_QUICK 0x1
 882 extern int has_sha1_file_with_flags(const unsigned char *sha1, int flags);
 883 static inline int has_sha1_file(const unsigned char *sha1)
 884 {
 885         return has_sha1_file_with_flags(sha1, 0);
 886 }
 887
 888 /*
 889  * Return true iff an alternate object database has a loose object
 890  * with the specified name.  This function does not respect replace
 891  * references.
 892  */
 893 extern int has_loose_object_nonlocal(const unsigned char *sha1);
 894
 895 extern int has_pack_index(const unsigned char *sha1);
 896
 897 extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
 898
 899 extern const signed char hexval_table[256];
 900 static inline unsigned int hexval(unsigned char c)
 901 {
 902         return hexval_table[c];
 903 }
 904
 905 /* Convert to/from hex/sha1 representation */
 906 #define MINIMUM_ABBREV minimum_abbrev
 907 #define DEFAULT_ABBREV default_abbrev
 908
 909 struct object_context {
 910         unsigned char tree[20];
 911         char path[PATH_MAX];
 912         unsigned mode;
 913 };
 914
 915 #define GET_SHA1_QUIETLY        01
 916 #define GET_SHA1_COMMIT         02
 917 #define GET_SHA1_COMMITTISH     04
 918 #define GET_SHA1_TREE          010
 919 #define GET_SHA1_TREEISH       020
 920 #define GET_SHA1_BLOB          040
 921 #define GET_SHA1_ONLY_TO_DIE 04000
 922
 923 extern int get_sha1(const char *str, unsigned char *sha1);
 924 extern int get_sha1_commit(const char *str, unsigned char *sha1);
 925 extern int get_sha1_committish(const char *str, unsigned char *sha1);
 926 extern int get_sha1_tree(const char *str, unsigned char *sha1);
 927 extern int get_sha1_treeish(const char *str, unsigned char *sha1);
 928 extern int get_sha1_blob(const char *str, unsigned char *sha1);
 929 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
 930 extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
 931
 932 typedef int each_abbrev_fn(const unsigned char *sha1, void *);
 933 extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
 934
 935 /*
 936  * Try to read a SHA1 in hexadecimal format from the 40 characters
 937  * starting at hex.  Write the 20-byte result to sha1 in binary form.
 938  * Return 0 on success.  Reading stops if a NUL is encountered in the
 939  * input, so it is safe to pass this function an arbitrary
 940  * null-terminated string.
 941  */
 942 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 943
 944 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 945 extern int read_ref_full(const char *refname, unsigned char *sha1,
 946                          int reading, int *flags);
 947 extern int read_ref(const char *refname, unsigned char *sha1);
 948
 949 /*
 950  * Resolve a reference, recursively following symbolic refererences.
 951  *
 952  * Store the referred-to object's name in sha1 and return the name of
 953  * the non-symbolic reference that ultimately pointed at it.  The
 954  * return value, if not NULL, is a pointer into either a static buffer
 955  * or the input ref.
 956  *
 957  * If the reference cannot be resolved to an object, the behavior
 958  * depends on the "reading" argument:
 959  *
 960  * - If reading is set, return NULL.
 961  *
 962  * - If reading is not set, clear sha1 and return the name of the last
 963  *   reference name in the chain, which will either be a non-symbolic
 964  *   reference or an undefined reference.  If this is a prelude to
 965  *   "writing" to the ref, the return value is the name of the ref
 966  *   that will actually be created or changed.
 967  *
 968  * If flag is non-NULL, set the value that it points to the
 969  * combination of REF_ISPACKED (if the reference was found among the
 970  * packed references) and REF_ISSYMREF (if the initial reference was a
 971  * symbolic reference).
 972  *
 973  * If ref is not a properly-formatted, normalized reference, return
 974  * NULL.  If more than MAXDEPTH recursive symbolic lookups are needed,
 975  * give up and return NULL.
 976  *
 977  * errno is sometimes set on errors, but not always.
 978  */
 979 extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
 980 extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
 981
 982 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 983 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 984 extern int interpret_branch_name(const char *str, int len, struct strbuf *);
 985 extern int get_sha1_mb(const char *str, unsigned char *sha1);
 986
 987 /*
 988  * Return true iff abbrev_name is a possible abbreviation for
 989  * full_name according to the rules defined by ref_rev_parse_rules in
 990  * refs.c.
 991  */
 992 extern int refname_match(const char *abbrev_name, const char *full_name);
 993
 994 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 995 extern int validate_headref(const char *ref);
 996
 997 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 998 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 999 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
1000 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
1001
1002 extern void *read_object_with_reference(const unsigned char *sha1,
1003                                         const char *required_type,
1004                                         unsigned long *size,
1005                                         unsigned char *sha1_ret);
1006
1007 extern struct object *peel_to_type(const char *name, int namelen,
1008                                    struct object *o, enum object_type);
1009
1010 enum date_mode {
1011         DATE_NORMAL = 0,
1012         DATE_RELATIVE,
1013         DATE_SHORT,
1014         DATE_LOCAL,
1015         DATE_ISO8601,
1016         DATE_RFC2822,
1017         DATE_RAW
1018 };
1019
1020 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
1021 void show_date_relative(unsigned long time, int tz, const struct timeval *now,
1022                         struct strbuf *timebuf);
1023 int parse_date(const char *date, char *buf, int bufsize);
1024 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
1025 int parse_expiry_date(const char *date, unsigned long *timestamp);
1026 void datestamp(char *buf, int bufsize);
1027 #define approxidate(s) approxidate_careful((s), NULL)
1028 unsigned long approxidate_careful(const char *, int *);
1029 unsigned long approxidate_relative(const char *date, const struct timeval *now);
1030 enum date_mode parse_date_format(const char *format);
1031 int date_overflows(unsigned long date);
1032
1033 #define IDENT_STRICT           1
1034 #define IDENT_NO_DATE          2
1035 #define IDENT_NO_NAME          4
1036 extern const char *git_author_info(int);
1037 extern const char *git_committer_info(int);
1038 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
1039 extern const char *fmt_name(const char *name, const char *email);
1040 extern const char *ident_default_email(void);
1041 extern const char *git_editor(void);
1042 extern const char *git_pager(int stdout_is_tty);
1043 extern int git_ident_config(const char *, const char *, void *);
1044
1045 struct ident_split {
1046         const char *name_begin;
1047         const char *name_end;
1048         const char *mail_begin;
1049         const char *mail_end;
1050         const char *date_begin;
1051         const char *date_end;
1052         const char *tz_begin;
1053         const char *tz_end;
1054 };
1055 /*
1056  * Signals an success with 0, but time part of the result may be NULL
1057  * if the input lacks timestamp and zone
1058  */
1059 extern int split_ident_line(struct ident_split *, const char *, int);
1060
1061 /*
1062  * Compare split idents for equality or strict ordering. Note that we
1063  * compare only the ident part of the line, ignoring any timestamp.
1064  *
1065  * Because there are two fields, we must choose one as the primary key; we
1066  * currently arbitrarily pick the email.
1067  */
1068 extern int ident_cmp(const struct ident_split *, const struct ident_split *);
1069
1070 struct checkout {
1071         const char *base_dir;
1072         int base_dir_len;
1073         unsigned force:1,
1074                  quiet:1,
1075                  not_new:1,
1076                  refresh_cache:1;
1077 };
1078
1079 #define TEMPORARY_FILENAME_LENGTH 25
1080 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
1081
1082 struct cache_def {
1083         char path[PATH_MAX + 1];
1084         int len;
1085         int flags;
1086         int track_flags;
1087         int prefix_len_stat_func;
1088 };
1089
1090 extern int has_symlink_leading_path(const char *name, int len);
1091 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
1092 extern int check_leading_path(const char *name, int len);
1093 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
1094 extern void schedule_dir_for_removal(const char *name, int len);
1095 extern void remove_scheduled_dirs(void);
1096
1097 extern struct alternate_object_database {
1098         struct alternate_object_database *next;
1099         char *name;
1100         char base[FLEX_ARRAY]; /* more */
1101 } *alt_odb_list;
1102 extern void prepare_alt_odb(void);
1103 extern void read_info_alternates(const char * relative_base, int depth);
1104 extern void add_to_alternates_file(const char *reference);
1105 typedef int alt_odb_fn(struct alternate_object_database *, void *);
1106 extern void foreach_alt_odb(alt_odb_fn, void*);
1107
1108 struct pack_window {
1109         struct pack_window *next;
1110         unsigned char *base;
1111         off_t offset;
1112         size_t len;
1113         unsigned int last_used;
1114         unsigned int inuse_cnt;
1115 };
1116
1117 extern struct packed_git {
1118         struct packed_git *next;
1119         struct pack_window *windows;
1120         off_t pack_size;
1121         const void *index_data;
1122         size_t index_size;
1123         uint32_t num_objects;
1124         uint32_t num_bad_objects;
1125         unsigned char *bad_object_sha1;
1126         int index_version;
1127         time_t mtime;
1128         int pack_fd;
1129         unsigned pack_local:1,
1130                  pack_keep:1,
1131                  do_not_close:1;
1132         unsigned char sha1[20];
1133         /* something like ".git/objects/pack/xxxxx.pack" */
1134         char pack_name[FLEX_ARRAY]; /* more */
1135 } *packed_git;
1136
1137 struct pack_entry {
1138         off_t offset;
1139         unsigned char sha1[20];
1140         struct packed_git *p;
1141 };
1142
1143 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1144
1145 /* A hook for count-objects to report invalid files in pack directory */
1146 extern void (*report_garbage)(const char *desc, const char *path);
1147
1148 extern void prepare_packed_git(void);
1149 extern void reprepare_packed_git(void);
1150 extern void install_packed_git(struct packed_git *pack);
1151
1152 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1153                                          struct packed_git *packs);
1154
1155 extern void pack_report(void);
1156
1157 /*
1158  * mmap the index file for the specified packfile (if it is not
1159  * already mmapped).  Return 0 on success.
1160  */
1161 extern int open_pack_index(struct packed_git *);
1162
1163 /*
1164  * munmap the index file for the specified packfile (if it is
1165  * currently mmapped).
1166  */
1167 extern void close_pack_index(struct packed_git *);
1168
1169 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1170 extern void close_pack_windows(struct packed_git *);
1171 extern void unuse_pack(struct pack_window **);
1172 extern void free_pack_by_name(const char *);
1173 extern void clear_delta_base_cache(void);
1174 extern struct packed_git *add_packed_git(const char *, int, int);
1175
1176 /*
1177  * Return the SHA-1 of the nth object within the specified packfile.
1178  * Open the index if it is not already open.  The return value points
1179  * at the SHA-1 within the mmapped index.  Return NULL if there is an
1180  * error.
1181  */
1182 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
1183
1184 /*
1185  * Return the offset of the nth object within the specified packfile.
1186  * The index must already be opened.
1187  */
1188 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
1189
1190 /*
1191  * If the object named sha1 is present in the specified packfile,
1192  * return its offset within the packfile; otherwise, return 0.
1193  */
1194 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
1195
1196 extern int is_pack_valid(struct packed_git *);
1197 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1198 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1199 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1200 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1201
1202 struct object_info {
1203         /* Request */
1204         enum object_type *typep;
1205         unsigned long *sizep;
1206         unsigned long *disk_sizep;
1207         unsigned char *delta_base_sha1;
1208
1209         /* Response */
1210         enum {
1211                 OI_CACHED,
1212                 OI_LOOSE,
1213                 OI_PACKED,
1214                 OI_DBCACHED
1215         } whence;
1216         union {
1217                 /*
1218                  * struct {
1219                  *      ... Nothing to expose in this case
1220                  * } cached;
1221                  * struct {
1222                  *      ... Nothing to expose in this case
1223                  * } loose;
1224                  */
1225                 struct {
1226                         struct packed_git *pack;
1227                         off_t offset;
1228                         unsigned int is_delta;
1229                 } packed;
1230         } u;
1231 };
1232 extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
1233
1234 /* Dumb servers support */
1235 extern int update_server_info(int);
1236
1237 /* git_config_parse_key() returns these negated: */
1238 #define CONFIG_INVALID_KEY 1
1239 #define CONFIG_NO_SECTION_OR_NAME 2
1240 /* git_config_set(), git_config_set_multivar() return the above or these: */
1241 #define CONFIG_NO_LOCK -1
1242 #define CONFIG_INVALID_FILE 3
1243 #define CONFIG_NO_WRITE 4
1244 #define CONFIG_NOTHING_SET 5
1245 #define CONFIG_INVALID_PATTERN 6
1246 #define CONFIG_GENERIC_ERROR 7
1247
1248 struct git_config_source {
1249         unsigned int use_stdin:1;
1250         const char *file;
1251         const char *blob;
1252 };
1253
1254 typedef int (*config_fn_t)(const char *, const char *, void *);
1255 extern int git_default_config(const char *, const char *, void *);
1256 extern int git_config_from_file(config_fn_t fn, const char *, void *);
1257 extern int git_config_from_buf(config_fn_t fn, const char *name,
1258                                const char *buf, size_t len, void *data);
1259 extern void git_config_push_parameter(const char *text);
1260 extern int git_config_from_parameters(config_fn_t fn, void *data);
1261 extern int git_config(config_fn_t fn, void *);
1262 extern int git_config_with_options(config_fn_t fn, void *,
1263                                    struct git_config_source *config_source,
1264                                    int respect_includes);
1265 extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
1266 extern int git_parse_ulong(const char *, unsigned long *);
1267 extern int git_config_int(const char *, const char *);
1268 extern int64_t git_config_int64(const char *, const char *);
1269 extern unsigned long git_config_ulong(const char *, const char *);
1270 extern int git_config_bool_or_int(const char *, const char *, int *);
1271 extern int git_config_bool(const char *, const char *);
1272 extern int git_config_maybe_bool(const char *, const char *);
1273 extern int git_config_string(const char **, const char *, const char *);
1274 extern int git_config_pathname(const char **, const char *, const char *);
1275 extern int git_config_set_in_file(const char *, const char *, const char *);
1276 extern int git_config_set(const char *, const char *);
1277 extern int git_config_parse_key(const char *, char **, int *);
1278 extern int git_config_set_multivar(const char *, const char *, const char *, int);
1279 extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1280 extern int git_config_rename_section(const char *, const char *);
1281 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1282 extern const char *git_etc_gitconfig(void);
1283 extern int check_repository_format_version(const char *var, const char *value, void *cb);
1284 extern int git_env_bool(const char *, int);
1285 extern int git_config_system(void);
1286 extern int config_error_nonbool(const char *);
1287 #if defined(__GNUC__) && ! defined(__clang__)
1288 #define config_error_nonbool(s) (config_error_nonbool(s), -1)
1289 #endif
1290 extern const char *get_log_output_encoding(void);
1291 extern const char *get_commit_output_encoding(void);
1292
1293 extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1294
1295 struct config_include_data {
1296         int depth;
1297         config_fn_t fn;
1298         void *data;
1299 };
1300 #define CONFIG_INCLUDE_INIT { 0 }
1301 extern int git_config_include(const char *name, const char *value, void *data);
1302
1303 /*
1304  * Match and parse a config key of the form:
1305  *
1306  *   section.(subsection.)?key
1307  *
1308  * (i.e., what gets handed to a config_fn_t). The caller provides the section;
1309  * we return -1 if it does not match, 0 otherwise. The subsection and key
1310  * out-parameters are filled by the function (and subsection is NULL if it is
1311  * missing).
1312  */
1313 extern int parse_config_key(const char *var,
1314                             const char *section,
1315                             const char **subsection, int *subsection_len,
1316                             const char **key);
1317
1318 extern int committer_ident_sufficiently_given(void);
1319 extern int author_ident_sufficiently_given(void);
1320
1321 extern const char *git_commit_encoding;
1322 extern const char *git_log_output_encoding;
1323 extern const char *git_mailmap_file;
1324 extern const char *git_mailmap_blob;
1325
1326 /* IO helper functions */
1327 extern void maybe_flush_or_die(FILE *, const char *);
1328 extern int copy_fd(int ifd, int ofd);
1329 extern int copy_file(const char *dst, const char *src, int mode);
1330 extern int copy_file_with_time(const char *dst, const char *src, int mode);
1331 extern void write_or_die(int fd, const void *buf, size_t count);
1332 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1333 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1334 extern void fsync_or_die(int fd, const char *);
1335
1336 extern ssize_t read_in_full(int fd, void *buf, size_t count);
1337 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1338 extern ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset);
1339
1340 static inline ssize_t write_str_in_full(int fd, const char *str)
1341 {
1342         return write_in_full(fd, str, strlen(str));
1343 }
1344
1345 /* pager.c */
1346 extern void setup_pager(void);
1347 extern const char *pager_program;
1348 extern int pager_in_use(void);
1349 extern int pager_use_color;
1350 extern int term_columns(void);
1351 extern int decimal_width(int);
1352 extern int check_pager_config(const char *cmd);
1353
1354 extern const char *editor_program;
1355 extern const char *askpass_program;
1356 extern const char *excludes_file;
1357
1358 /* base85 */
1359 int decode_85(char *dst, const char *line, int linelen);
1360 void encode_85(char *buf, const unsigned char *data, int bytes);
1361
1362 /* alloc.c */
1363 extern void *alloc_blob_node(void);
1364 extern void *alloc_tree_node(void);
1365 extern void *alloc_commit_node(void);
1366 extern void *alloc_tag_node(void);
1367 extern void *alloc_object_node(void);
1368 extern void alloc_report(void);
1369 extern unsigned int alloc_commit_index(void);
1370
1371 /* trace.c */
1372 __attribute__((format (printf, 1, 2)))
1373 extern void trace_printf(const char *format, ...);
1374 __attribute__((format (printf, 2, 3)))
1375 extern void trace_argv_printf(const char **argv, const char *format, ...);
1376 extern void trace_repo_setup(const char *prefix);
1377 extern int trace_want(const char *key);
1378 __attribute__((format (printf, 2, 3)))
1379 extern void trace_printf_key(const char *key, const char *fmt, ...);
1380 extern void trace_strbuf(const char *key, const struct strbuf *buf);
1381
1382 void packet_trace_identity(const char *prog);
1383
1384 /* add */
1385 /*
1386  * return 0 if success, 1 - if addition of a file failed and
1387  * ADD_FILES_IGNORE_ERRORS was specified in flags
1388  */
1389 int add_files_to_cache(const char *prefix, const struct pathspec *pathspec, int flags);
1390
1391 /* diff.c */
1392 extern int diff_auto_refresh_index;
1393
1394 /* match-trees.c */
1395 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1396 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1397
1398 /*
1399  * whitespace rules.
1400  * used by both diff and apply
1401  * last two digits are tab width
1402  */
1403 #define WS_BLANK_AT_EOL         0100
1404 #define WS_SPACE_BEFORE_TAB     0200
1405 #define WS_INDENT_WITH_NON_TAB  0400
1406 #define WS_CR_AT_EOL           01000
1407 #define WS_BLANK_AT_EOF        02000
1408 #define WS_TAB_IN_INDENT       04000
1409 #define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1410 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1411 #define WS_TAB_WIDTH_MASK        077
1412 extern unsigned whitespace_rule_cfg;
1413 extern unsigned whitespace_rule(const char *);
1414 extern unsigned parse_whitespace_rule(const char *);
1415 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1416 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1417 extern char *whitespace_error_string(unsigned ws);
1418 extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1419 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1420 #define ws_tab_width(rule)     ((rule) & WS_TAB_WIDTH_MASK)
1421
1422 /* ls-files */
1423 int report_path_error(const char *ps_matched, const struct pathspec *pathspec, const char *prefix);
1424 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1425
1426 char *alias_lookup(const char *alias);
1427 int split_cmdline(char *cmdline, const char ***argv);
1428 /* Takes a negative value returned by split_cmdline */
1429 const char *split_cmdline_strerror(int cmdline_errno);
1430
1431 /* git.c */
1432 struct startup_info {
1433         int have_repository;
1434         const char *prefix;
1435 };
1436 extern struct startup_info *startup_info;
1437
1438 /* merge.c */
1439 struct commit_list;
1440 int try_merge_command(const char *strategy, size_t xopts_nr,
1441                 const char **xopts, struct commit_list *common,
1442                 const char *head_arg, struct commit_list *remotes);
1443 int checkout_fast_forward(const unsigned char *from,
1444                           const unsigned char *to,
1445                           int overwrite_ignore);
1446
1447
1448 int sane_execvp(const char *file, char *const argv[]);
1449
1450 /*
1451  * A struct to encapsulate the concept of whether a file has changed
1452  * since we last checked it. This uses criteria similar to those used
1453  * for the index.
1454  */
1455 struct stat_validity {
1456         struct stat_data *sd;
1457 };
1458
1459 void stat_validity_clear(struct stat_validity *sv);
1460
1461 /*
1462  * Returns 1 if the path is a regular file (or a symlink to a regular
1463  * file) and matches the saved stat_validity, 0 otherwise.  A missing
1464  * or inaccessible file is considered a match if the struct was just
1465  * initialized, or if the previous update found an inaccessible file.
1466  */
1467 int stat_validity_check(struct stat_validity *sv, const char *path);
1468
1469 /*
1470  * Update the stat_validity from a file opened at descriptor fd. If
1471  * the file is missing, inaccessible, or not a regular file, then
1472  * future calls to stat_validity_check will match iff one of those
1473  * conditions continues to be true.
1474  */
1475 void stat_validity_update(struct stat_validity *sv, int fd);
1476
1477 int versioncmp(const char *s1, const char *s2);
1478
1479 #endif /* CACHE_H */