cache.hon commit pack-objects: refactor the packing list (2834bc2)
   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>
  20typedef 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
  30void git_inflate_init(git_zstream *);
  31void git_inflate_init_gzip_only(git_zstream *);
  32void git_inflate_end(git_zstream *);
  33int git_inflate(git_zstream *, int flush);
  34
  35void git_deflate_init(git_zstream *, int level);
  36void git_deflate_init_gzip(git_zstream *, int level);
  37void git_deflate_init_raw(git_zstream *, int level);
  38void git_deflate_end(git_zstream *);
  39int git_deflate_abort(git_zstream *);
  40int git_deflate_end_gently(git_zstream *);
  41int git_deflate(git_zstream *, int flush);
  42unsigned 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" */
 103struct 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 */
 117struct cache_time {
 118        uint32_t sec;
 119        uint32_t nsec;
 120};
 121
 122struct 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
 132struct cache_entry {
 133        struct stat_data ce_stat_data;
 134        unsigned int ce_mode;
 135        unsigned int ce_flags;
 136        unsigned int ce_namelen;
 137        unsigned char sha1[20];
 138        struct cache_entry *next;
 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_UNHASHED          (1 << 21)
 163#define CE_WT_REMOVE         (1 << 22) /* remove in work directory */
 164#define CE_CONFLICTED        (1 << 23)
 165
 166#define CE_UNPACKED          (1 << 24)
 167#define CE_NEW_SKIP_WORKTREE (1 << 25)
 168
 169/* used to temporarily mark paths matched by pathspecs */
 170#define CE_MATCHED           (1 << 26)
 171
 172/*
 173 * Extended on-disk flags
 174 */
 175#define CE_INTENT_TO_ADD     (1 << 29)
 176#define CE_SKIP_WORKTREE     (1 << 30)
 177/* CE_EXTENDED2 is for future extension */
 178#define CE_EXTENDED2         (1 << 31)
 179
 180#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
 181
 182/*
 183 * Safeguard to avoid saving wrong flags:
 184 *  - CE_EXTENDED2 won't get saved until its semantic is known
 185 *  - Bits in 0x0000FFFF have been saved in ce_flags already
 186 *  - Bits in 0x003F0000 are currently in-memory flags
 187 */
 188#if CE_EXTENDED_FLAGS & 0x803FFFFF
 189#error "CE_EXTENDED_FLAGS out of range"
 190#endif
 191
 192struct pathspec;
 193
 194/*
 195 * Copy the sha1 and stat state of a cache entry from one to
 196 * another. But we never change the name, or the hash state!
 197 */
 198#define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
 199static inline void copy_cache_entry(struct cache_entry *dst,
 200                                    const struct cache_entry *src)
 201{
 202        unsigned int state = dst->ce_flags & CE_STATE_MASK;
 203
 204        /* Don't copy hash chain and name */
 205        memcpy(dst, src, offsetof(struct cache_entry, next));
 206
 207        /* Restore the hash state */
 208        dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
 209}
 210
 211static 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)
 224static 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}
 232static 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}
 246static 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}
 258static 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
 271struct 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 hash_table name_hash;
 281        struct hash_table dir_hash;
 282};
 283
 284extern struct index_state the_index;
 285
 286/* Name hashing */
 287extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
 288extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
 289extern void free_name_hash(struct index_state *istate);
 290
 291
 292#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 293#define active_cache (the_index.cache)
 294#define active_nr (the_index.cache_nr)
 295#define active_alloc (the_index.cache_alloc)
 296#define active_cache_changed (the_index.cache_changed)
 297#define active_cache_tree (the_index.cache_tree)
 298
 299#define read_cache() read_index(&the_index)
 300#define read_cache_from(path) read_index_from(&the_index, (path))
 301#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
 302#define is_cache_unborn() is_index_unborn(&the_index)
 303#define read_cache_unmerged() read_index_unmerged(&the_index)
 304#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 305#define discard_cache() discard_index(&the_index)
 306#define unmerged_cache() unmerged_index(&the_index)
 307#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 308#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 309#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
 310#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 311#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 312#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
 313#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
 314#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
 315#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 316#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 317#define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
 318#define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
 319#define cache_name_exists(name, namelen, igncase) index_name_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
 327enum 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
 341static 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 TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 358#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 359#define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
 360#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 361#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
 362#define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
 363#define GITATTRIBUTES_FILE ".gitattributes"
 364#define INFOATTRIBUTES_FILE "info/attributes"
 365#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 366#define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 367#define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 368#define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
 369#define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
 370#define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
 371#define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
 372#define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
 373#define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
 374#define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
 375
 376/*
 377 * This environment variable is expected to contain a boolean indicating
 378 * whether we should or should not treat:
 379 *
 380 *   GIT_DIR=foo.git git ...
 381 *
 382 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use
 383 * of this, but we use it internally to communicate to sub-processes that we
 384 * are in a bare repo. If not set, defaults to true.
 385 */
 386#define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
 387
 388/*
 389 * Repository-local GIT_* environment variables; these will be cleared
 390 * when git spawns a sub-process that runs inside another repository.
 391 * The array is NULL-terminated, which makes it easy to pass in the "env"
 392 * parameter of a run-command invocation, or to do a simple walk.
 393 */
 394extern const char * const local_repo_env[];
 395
 396extern int is_bare_repository_cfg;
 397extern int is_bare_repository(void);
 398extern int is_inside_git_dir(void);
 399extern char *git_work_tree_cfg;
 400extern int is_inside_work_tree(void);
 401extern int have_git_dir(void);
 402extern const char *get_git_dir(void);
 403extern int is_git_directory(const char *path);
 404extern char *get_object_directory(void);
 405extern char *get_index_file(void);
 406extern char *get_graft_file(void);
 407extern int set_git_dir(const char *path);
 408extern const char *get_git_namespace(void);
 409extern const char *strip_namespace(const char *namespaced_ref);
 410extern const char *get_git_work_tree(void);
 411extern const char *read_gitfile(const char *path);
 412extern const char *resolve_gitdir(const char *suspect);
 413extern void set_git_work_tree(const char *tree);
 414
 415#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 416
 417extern const char **get_pathspec(const char *prefix, const char **pathspec);
 418extern void setup_work_tree(void);
 419extern const char *setup_git_directory_gently(int *);
 420extern const char *setup_git_directory(void);
 421extern char *prefix_path(const char *prefix, int len, const char *path);
 422extern char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
 423extern const char *prefix_filename(const char *prefix, int len, const char *path);
 424extern int check_filename(const char *prefix, const char *name);
 425extern void verify_filename(const char *prefix,
 426                            const char *name,
 427                            int diagnose_misspelt_rev);
 428extern void verify_non_filename(const char *prefix, const char *name);
 429extern int path_inside_repo(const char *prefix, const char *path);
 430
 431#define INIT_DB_QUIET 0x0001
 432
 433extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
 434extern int init_db(const char *template_dir, unsigned int flags);
 435
 436extern void sanitize_stdfds(void);
 437
 438#define alloc_nr(x) (((x)+16)*3/2)
 439
 440/*
 441 * Realloc the buffer pointed at by variable 'x' so that it can hold
 442 * at least 'nr' entries; the number of entries currently allocated
 443 * is 'alloc', using the standard growing factor alloc_nr() macro.
 444 *
 445 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
 446 */
 447#define ALLOC_GROW(x, nr, alloc) \
 448        do { \
 449                if ((nr) > alloc) { \
 450                        if (alloc_nr(alloc) < (nr)) \
 451                                alloc = (nr); \
 452                        else \
 453                                alloc = alloc_nr(alloc); \
 454                        x = xrealloc((x), alloc * sizeof(*(x))); \
 455                } \
 456        } while (0)
 457
 458/* Initialize and use the cache information */
 459extern int read_index(struct index_state *);
 460extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
 461extern int read_index_from(struct index_state *, const char *path);
 462extern int is_index_unborn(struct index_state *);
 463extern int read_index_unmerged(struct index_state *);
 464extern int write_index(struct index_state *, int newfd);
 465extern int discard_index(struct index_state *);
 466extern int unmerged_index(const struct index_state *);
 467extern int verify_path(const char *path);
 468extern struct cache_entry *index_dir_exists(struct index_state *istate, const char *name, int namelen);
 469extern struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 470extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
 471extern 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 */
 477extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 478extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
 479extern int remove_index_entry_at(struct index_state *, int pos);
 480extern void remove_marked_cache_entries(struct index_state *istate);
 481extern 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#define ADD_CACHE_IMPLICIT_DOT 32       /* internal to "git add -u/-A" */
 488extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
 489extern int add_file_to_index(struct index_state *, const char *path, int flags);
 490extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 491extern int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
 492extern int index_name_is_other(const struct index_state *, const char *, int);
 493extern 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
 501extern int ie_match_stat(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
 502extern int ie_modified(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
 503
 504extern int ce_path_match(const struct cache_entry *ce, const struct pathspec *pathspec);
 505
 506#define HASH_WRITE_OBJECT 1
 507#define HASH_FORMAT_CHECK 2
 508extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
 509extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
 510
 511/*
 512 * Record to sd the data from st that we use to check whether a file
 513 * might have changed.
 514 */
 515extern void fill_stat_data(struct stat_data *sd, struct stat *st);
 516
 517/*
 518 * Return 0 if st is consistent with a file not having been changed
 519 * since sd was filled.  If there are differences, return a
 520 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
 521 * INODE_CHANGED, and DATA_CHANGED.
 522 */
 523extern int match_stat_data(const struct stat_data *sd, struct stat *st);
 524
 525extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 526
 527#define REFRESH_REALLY          0x0001  /* ignore_valid */
 528#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 529#define REFRESH_QUIET           0x0004  /* be quiet about it */
 530#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 531#define REFRESH_IGNORE_SUBMODULES       0x0010  /* ignore submodules */
 532#define REFRESH_IN_PORCELAIN    0x0020  /* user friendly output, not "needs update" */
 533extern int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
 534
 535struct lock_file {
 536        struct lock_file *next;
 537        int fd;
 538        pid_t owner;
 539        char on_list;
 540        char filename[PATH_MAX];
 541};
 542#define LOCK_DIE_ON_ERROR 1
 543#define LOCK_NODEREF 2
 544extern int unable_to_lock_error(const char *path, int err);
 545extern NORETURN void unable_to_lock_index_die(const char *path, int err);
 546extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 547extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
 548extern int commit_lock_file(struct lock_file *);
 549extern void update_index_if_able(struct index_state *, struct lock_file *);
 550
 551extern int hold_locked_index(struct lock_file *, int);
 552extern int commit_locked_index(struct lock_file *);
 553extern void set_alternate_index_output(const char *);
 554extern int close_lock_file(struct lock_file *);
 555extern void rollback_lock_file(struct lock_file *);
 556extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
 557
 558/* Environment bits from configuration mechanism */
 559extern int trust_executable_bit;
 560extern int trust_ctime;
 561extern int check_stat;
 562extern int quote_path_fully;
 563extern int has_symlinks;
 564extern int minimum_abbrev, default_abbrev;
 565extern int ignore_case;
 566extern int assume_unchanged;
 567extern int prefer_symlink_refs;
 568extern int log_all_ref_updates;
 569extern int warn_ambiguous_refs;
 570extern int warn_on_object_refname_ambiguity;
 571extern int shared_repository;
 572extern const char *apply_default_whitespace;
 573extern const char *apply_default_ignorewhitespace;
 574extern const char *git_attributes_file;
 575extern int zlib_compression_level;
 576extern int core_compression_level;
 577extern int core_compression_seen;
 578extern size_t packed_git_window_size;
 579extern size_t packed_git_limit;
 580extern size_t delta_base_cache_limit;
 581extern unsigned long big_file_threshold;
 582extern unsigned long pack_size_limit_cfg;
 583extern int read_replace_refs;
 584extern int fsync_object_files;
 585extern int core_preload_index;
 586extern int core_apply_sparse_checkout;
 587extern int precomposed_unicode;
 588
 589/*
 590 * The character that begins a commented line in user-editable file
 591 * that is subject to stripspace.
 592 */
 593extern char comment_line_char;
 594
 595enum branch_track {
 596        BRANCH_TRACK_UNSPECIFIED = -1,
 597        BRANCH_TRACK_NEVER = 0,
 598        BRANCH_TRACK_REMOTE,
 599        BRANCH_TRACK_ALWAYS,
 600        BRANCH_TRACK_EXPLICIT,
 601        BRANCH_TRACK_OVERRIDE
 602};
 603
 604enum rebase_setup_type {
 605        AUTOREBASE_NEVER = 0,
 606        AUTOREBASE_LOCAL,
 607        AUTOREBASE_REMOTE,
 608        AUTOREBASE_ALWAYS
 609};
 610
 611enum push_default_type {
 612        PUSH_DEFAULT_NOTHING = 0,
 613        PUSH_DEFAULT_MATCHING,
 614        PUSH_DEFAULT_SIMPLE,
 615        PUSH_DEFAULT_UPSTREAM,
 616        PUSH_DEFAULT_CURRENT,
 617        PUSH_DEFAULT_UNSPECIFIED
 618};
 619
 620extern enum branch_track git_branch_track;
 621extern enum rebase_setup_type autorebase;
 622extern enum push_default_type push_default;
 623
 624enum object_creation_mode {
 625        OBJECT_CREATION_USES_HARDLINKS = 0,
 626        OBJECT_CREATION_USES_RENAMES = 1
 627};
 628
 629extern enum object_creation_mode object_creation_mode;
 630
 631extern char *notes_ref_name;
 632
 633extern int grafts_replace_parents;
 634
 635#define GIT_REPO_VERSION 0
 636extern int repository_format_version;
 637extern int check_repository_format(void);
 638
 639#define MTIME_CHANGED   0x0001
 640#define CTIME_CHANGED   0x0002
 641#define OWNER_CHANGED   0x0004
 642#define MODE_CHANGED    0x0008
 643#define INODE_CHANGED   0x0010
 644#define DATA_CHANGED    0x0020
 645#define TYPE_CHANGED    0x0040
 646
 647extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
 648        __attribute__((format (printf, 3, 4)));
 649extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
 650        __attribute__((format (printf, 3, 4)));
 651extern char *git_pathdup(const char *fmt, ...)
 652        __attribute__((format (printf, 1, 2)));
 653extern char *mkpathdup(const char *fmt, ...)
 654        __attribute__((format (printf, 1, 2)));
 655
 656/* Return a statically allocated filename matching the sha1 signature */
 657extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 658extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 659extern char *git_path_submodule(const char *path, const char *fmt, ...)
 660        __attribute__((format (printf, 2, 3)));
 661
 662extern char *sha1_file_name(const unsigned char *sha1);
 663extern char *sha1_pack_name(const unsigned char *sha1);
 664extern char *sha1_pack_index_name(const unsigned char *sha1);
 665extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 666extern const unsigned char null_sha1[20];
 667
 668static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 669{
 670        int i;
 671
 672        for (i = 0; i < 20; i++, sha1++, sha2++) {
 673                if (*sha1 != *sha2)
 674                        return *sha1 - *sha2;
 675        }
 676
 677        return 0;
 678}
 679
 680static inline int is_null_sha1(const unsigned char *sha1)
 681{
 682        return !hashcmp(sha1, null_sha1);
 683}
 684
 685static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 686{
 687        memcpy(sha_dst, sha_src, 20);
 688}
 689static inline void hashclr(unsigned char *hash)
 690{
 691        memset(hash, 0, 20);
 692}
 693
 694#define EMPTY_TREE_SHA1_HEX \
 695        "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
 696#define EMPTY_TREE_SHA1_BIN_LITERAL \
 697         "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
 698         "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
 699#define EMPTY_TREE_SHA1_BIN \
 700         ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
 701
 702#define EMPTY_BLOB_SHA1_HEX \
 703        "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
 704#define EMPTY_BLOB_SHA1_BIN_LITERAL \
 705        "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
 706        "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
 707#define EMPTY_BLOB_SHA1_BIN \
 708        ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
 709
 710static inline int is_empty_blob_sha1(const unsigned char *sha1)
 711{
 712        return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
 713}
 714
 715int git_mkstemp(char *path, size_t n, const char *template);
 716
 717int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
 718
 719/* set default permissions by passing mode arguments to open(2) */
 720int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
 721int git_mkstemp_mode(char *pattern, int mode);
 722
 723/*
 724 * NOTE NOTE NOTE!!
 725 *
 726 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
 727 * not be changed. Old repositories have core.sharedrepository written in
 728 * numeric format, and therefore these values are preserved for compatibility
 729 * reasons.
 730 */
 731enum sharedrepo {
 732        PERM_UMASK          = 0,
 733        OLD_PERM_GROUP      = 1,
 734        OLD_PERM_EVERYBODY  = 2,
 735        PERM_GROUP          = 0660,
 736        PERM_EVERYBODY      = 0664
 737};
 738int git_config_perm(const char *var, const char *value);
 739int adjust_shared_perm(const char *path);
 740int safe_create_leading_directories(char *path);
 741int safe_create_leading_directories_const(const char *path);
 742int mkdir_in_gitdir(const char *path);
 743extern void home_config_paths(char **global, char **xdg, char *file);
 744extern char *expand_user_path(const char *path);
 745const char *enter_repo(const char *path, int strict);
 746static inline int is_absolute_path(const char *path)
 747{
 748        return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
 749}
 750int is_directory(const char *);
 751const char *real_path(const char *path);
 752const char *real_path_if_valid(const char *path);
 753const char *absolute_path(const char *path);
 754const char *relative_path(const char *in, const char *prefix, struct strbuf *sb);
 755int normalize_path_copy_len(char *dst, const char *src, int *prefix_len);
 756int normalize_path_copy(char *dst, const char *src);
 757int longest_ancestor_length(const char *path, struct string_list *prefixes);
 758char *strip_path_suffix(const char *path, const char *suffix);
 759int daemon_avoid_alias(const char *path);
 760int offset_1st_component(const char *path);
 761
 762/* object replacement */
 763#define READ_SHA1_FILE_REPLACE 1
 764extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
 765static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
 766{
 767        return read_sha1_file_extended(sha1, type, size, READ_SHA1_FILE_REPLACE);
 768}
 769extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
 770static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
 771{
 772        if (!read_replace_refs)
 773                return sha1;
 774        return do_lookup_replace_object(sha1);
 775}
 776
 777/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 778extern int sha1_object_info(const unsigned char *, unsigned long *);
 779extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 780extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 781extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 782extern int force_object_loose(const unsigned char *sha1, time_t mtime);
 783extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
 784extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
 785extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
 786
 787/* global flag to enable extra checks when accessing packed objects */
 788extern int do_check_packed_object_crc;
 789
 790extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 791
 792extern int move_temp_to_file(const char *tmpfile, const char *filename);
 793
 794extern int has_sha1_pack(const unsigned char *sha1);
 795extern int has_sha1_file(const unsigned char *sha1);
 796extern int has_loose_object_nonlocal(const unsigned char *sha1);
 797
 798extern int has_pack_index(const unsigned char *sha1);
 799
 800extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
 801
 802extern const signed char hexval_table[256];
 803static inline unsigned int hexval(unsigned char c)
 804{
 805        return hexval_table[c];
 806}
 807
 808/* Convert to/from hex/sha1 representation */
 809#define MINIMUM_ABBREV minimum_abbrev
 810#define DEFAULT_ABBREV default_abbrev
 811
 812struct object_context {
 813        unsigned char tree[20];
 814        char path[PATH_MAX];
 815        unsigned mode;
 816};
 817
 818#define GET_SHA1_QUIETLY        01
 819#define GET_SHA1_COMMIT         02
 820#define GET_SHA1_COMMITTISH     04
 821#define GET_SHA1_TREE          010
 822#define GET_SHA1_TREEISH       020
 823#define GET_SHA1_BLOB          040
 824#define GET_SHA1_ONLY_TO_DIE 04000
 825
 826extern int get_sha1(const char *str, unsigned char *sha1);
 827extern int get_sha1_commit(const char *str, unsigned char *sha1);
 828extern int get_sha1_committish(const char *str, unsigned char *sha1);
 829extern int get_sha1_tree(const char *str, unsigned char *sha1);
 830extern int get_sha1_treeish(const char *str, unsigned char *sha1);
 831extern int get_sha1_blob(const char *str, unsigned char *sha1);
 832extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
 833extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
 834
 835typedef int each_abbrev_fn(const unsigned char *sha1, void *);
 836extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
 837
 838/*
 839 * Try to read a SHA1 in hexadecimal format from the 40 characters
 840 * starting at hex.  Write the 20-byte result to sha1 in binary form.
 841 * Return 0 on success.  Reading stops if a NUL is encountered in the
 842 * input, so it is safe to pass this function an arbitrary
 843 * null-terminated string.
 844 */
 845extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 846
 847extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 848extern int read_ref_full(const char *refname, unsigned char *sha1,
 849                         int reading, int *flags);
 850extern int read_ref(const char *refname, unsigned char *sha1);
 851
 852/*
 853 * Resolve a reference, recursively following symbolic refererences.
 854 *
 855 * Store the referred-to object's name in sha1 and return the name of
 856 * the non-symbolic reference that ultimately pointed at it.  The
 857 * return value, if not NULL, is a pointer into either a static buffer
 858 * or the input ref.
 859 *
 860 * If the reference cannot be resolved to an object, the behavior
 861 * depends on the "reading" argument:
 862 *
 863 * - If reading is set, return NULL.
 864 *
 865 * - If reading is not set, clear sha1 and return the name of the last
 866 *   reference name in the chain, which will either be a non-symbolic
 867 *   reference or an undefined reference.  If this is a prelude to
 868 *   "writing" to the ref, the return value is the name of the ref
 869 *   that will actually be created or changed.
 870 *
 871 * If flag is non-NULL, set the value that it points to the
 872 * combination of REF_ISPACKED (if the reference was found among the
 873 * packed references) and REF_ISSYMREF (if the initial reference was a
 874 * symbolic reference).
 875 *
 876 * If ref is not a properly-formatted, normalized reference, return
 877 * NULL.  If more than MAXDEPTH recursive symbolic lookups are needed,
 878 * give up and return NULL.
 879 *
 880 * errno is sometimes set on errors, but not always.
 881 */
 882extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
 883extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
 884
 885extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 886extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 887extern int interpret_branch_name(const char *str, int len, struct strbuf *);
 888extern int get_sha1_mb(const char *str, unsigned char *sha1);
 889
 890extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 891extern const char *ref_rev_parse_rules[];
 892#define ref_fetch_rules ref_rev_parse_rules
 893
 894extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 895extern int validate_headref(const char *ref);
 896
 897extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 898extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 899extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 900extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
 901
 902extern void *read_object_with_reference(const unsigned char *sha1,
 903                                        const char *required_type,
 904                                        unsigned long *size,
 905                                        unsigned char *sha1_ret);
 906
 907extern struct object *peel_to_type(const char *name, int namelen,
 908                                   struct object *o, enum object_type);
 909
 910enum date_mode {
 911        DATE_NORMAL = 0,
 912        DATE_RELATIVE,
 913        DATE_SHORT,
 914        DATE_LOCAL,
 915        DATE_ISO8601,
 916        DATE_RFC2822,
 917        DATE_RAW
 918};
 919
 920const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 921void show_date_relative(unsigned long time, int tz, const struct timeval *now,
 922                        struct strbuf *timebuf);
 923int parse_date(const char *date, char *buf, int bufsize);
 924int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
 925int parse_expiry_date(const char *date, unsigned long *timestamp);
 926void datestamp(char *buf, int bufsize);
 927#define approxidate(s) approxidate_careful((s), NULL)
 928unsigned long approxidate_careful(const char *, int *);
 929unsigned long approxidate_relative(const char *date, const struct timeval *now);
 930enum date_mode parse_date_format(const char *format);
 931
 932#define IDENT_STRICT           1
 933#define IDENT_NO_DATE          2
 934#define IDENT_NO_NAME          4
 935extern const char *git_author_info(int);
 936extern const char *git_committer_info(int);
 937extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 938extern const char *fmt_name(const char *name, const char *email);
 939extern const char *ident_default_email(void);
 940extern const char *git_editor(void);
 941extern const char *git_pager(int stdout_is_tty);
 942extern int git_ident_config(const char *, const char *, void *);
 943
 944struct ident_split {
 945        const char *name_begin;
 946        const char *name_end;
 947        const char *mail_begin;
 948        const char *mail_end;
 949        const char *date_begin;
 950        const char *date_end;
 951        const char *tz_begin;
 952        const char *tz_end;
 953};
 954/*
 955 * Signals an success with 0, but time part of the result may be NULL
 956 * if the input lacks timestamp and zone
 957 */
 958extern int split_ident_line(struct ident_split *, const char *, int);
 959
 960/*
 961 * Compare split idents for equality or strict ordering. Note that we
 962 * compare only the ident part of the line, ignoring any timestamp.
 963 *
 964 * Because there are two fields, we must choose one as the primary key; we
 965 * currently arbitrarily pick the email.
 966 */
 967extern int ident_cmp(const struct ident_split *, const struct ident_split *);
 968
 969struct checkout {
 970        const char *base_dir;
 971        int base_dir_len;
 972        unsigned force:1,
 973                 quiet:1,
 974                 not_new:1,
 975                 refresh_cache:1;
 976};
 977
 978extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 979
 980struct cache_def {
 981        char path[PATH_MAX + 1];
 982        int len;
 983        int flags;
 984        int track_flags;
 985        int prefix_len_stat_func;
 986};
 987
 988extern int has_symlink_leading_path(const char *name, int len);
 989extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
 990extern int check_leading_path(const char *name, int len);
 991extern int has_dirs_only_path(const char *name, int len, int prefix_len);
 992extern void schedule_dir_for_removal(const char *name, int len);
 993extern void remove_scheduled_dirs(void);
 994
 995extern struct alternate_object_database {
 996        struct alternate_object_database *next;
 997        char *name;
 998        char base[FLEX_ARRAY]; /* more */
 999} *alt_odb_list;
1000extern void prepare_alt_odb(void);
1001extern void read_info_alternates(const char * relative_base, int depth);
1002extern void add_to_alternates_file(const char *reference);
1003typedef int alt_odb_fn(struct alternate_object_database *, void *);
1004extern void foreach_alt_odb(alt_odb_fn, void*);
1005
1006struct pack_window {
1007        struct pack_window *next;
1008        unsigned char *base;
1009        off_t offset;
1010        size_t len;
1011        unsigned int last_used;
1012        unsigned int inuse_cnt;
1013};
1014
1015extern struct packed_git {
1016        struct packed_git *next;
1017        struct pack_window *windows;
1018        off_t pack_size;
1019        const void *index_data;
1020        size_t index_size;
1021        uint32_t num_objects;
1022        uint32_t num_bad_objects;
1023        unsigned char *bad_object_sha1;
1024        int index_version;
1025        time_t mtime;
1026        int pack_fd;
1027        unsigned pack_local:1,
1028                 pack_keep:1,
1029                 do_not_close:1;
1030        unsigned char sha1[20];
1031        /* something like ".git/objects/pack/xxxxx.pack" */
1032        char pack_name[FLEX_ARRAY]; /* more */
1033} *packed_git;
1034
1035struct pack_entry {
1036        off_t offset;
1037        unsigned char sha1[20];
1038        struct packed_git *p;
1039};
1040
1041extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1042
1043/* A hook for count-objects to report invalid files in pack directory */
1044extern void (*report_garbage)(const char *desc, const char *path);
1045
1046extern void prepare_packed_git(void);
1047extern void reprepare_packed_git(void);
1048extern void install_packed_git(struct packed_git *pack);
1049
1050extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1051                                         struct packed_git *packs);
1052
1053extern void pack_report(void);
1054extern int open_pack_index(struct packed_git *);
1055extern void close_pack_index(struct packed_git *);
1056extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1057extern void close_pack_windows(struct packed_git *);
1058extern void unuse_pack(struct pack_window **);
1059extern void free_pack_by_name(const char *);
1060extern void clear_delta_base_cache(void);
1061extern struct packed_git *add_packed_git(const char *, int, int);
1062extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
1063extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
1064extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
1065extern int is_pack_valid(struct packed_git *);
1066extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1067extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1068extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1069extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1070
1071struct object_info {
1072        /* Request */
1073        enum object_type *typep;
1074        unsigned long *sizep;
1075        unsigned long *disk_sizep;
1076
1077        /* Response */
1078        enum {
1079                OI_CACHED,
1080                OI_LOOSE,
1081                OI_PACKED,
1082                OI_DBCACHED
1083        } whence;
1084        union {
1085                /*
1086                 * struct {
1087                 *      ... Nothing to expose in this case
1088                 * } cached;
1089                 * struct {
1090                 *      ... Nothing to expose in this case
1091                 * } loose;
1092                 */
1093                struct {
1094                        struct packed_git *pack;
1095                        off_t offset;
1096                        unsigned int is_delta;
1097                } packed;
1098        } u;
1099};
1100extern int sha1_object_info_extended(const unsigned char *, struct object_info *);
1101
1102/* Dumb servers support */
1103extern int update_server_info(int);
1104
1105/* git_config_parse_key() returns these negated: */
1106#define CONFIG_INVALID_KEY 1
1107#define CONFIG_NO_SECTION_OR_NAME 2
1108/* git_config_set(), git_config_set_multivar() return the above or these: */
1109#define CONFIG_NO_LOCK -1
1110#define CONFIG_INVALID_FILE 3
1111#define CONFIG_NO_WRITE 4
1112#define CONFIG_NOTHING_SET 5
1113#define CONFIG_INVALID_PATTERN 6
1114#define CONFIG_GENERIC_ERROR 7
1115
1116typedef int (*config_fn_t)(const char *, const char *, void *);
1117extern int git_default_config(const char *, const char *, void *);
1118extern int git_config_from_file(config_fn_t fn, const char *, void *);
1119extern int git_config_from_buf(config_fn_t fn, const char *name,
1120                               const char *buf, size_t len, void *data);
1121extern void git_config_push_parameter(const char *text);
1122extern int git_config_from_parameters(config_fn_t fn, void *data);
1123extern int git_config(config_fn_t fn, void *);
1124extern int git_config_with_options(config_fn_t fn, void *,
1125                                   const char *filename,
1126                                   const char *blob_ref,
1127                                   int respect_includes);
1128extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
1129extern int git_parse_ulong(const char *, unsigned long *);
1130extern int git_config_int(const char *, const char *);
1131extern int64_t git_config_int64(const char *, const char *);
1132extern unsigned long git_config_ulong(const char *, const char *);
1133extern int git_config_bool_or_int(const char *, const char *, int *);
1134extern int git_config_bool(const char *, const char *);
1135extern int git_config_maybe_bool(const char *, const char *);
1136extern int git_config_string(const char **, const char *, const char *);
1137extern int git_config_pathname(const char **, const char *, const char *);
1138extern int git_config_set_in_file(const char *, const char *, const char *);
1139extern int git_config_set(const char *, const char *);
1140extern int git_config_parse_key(const char *, char **, int *);
1141extern int git_config_set_multivar(const char *, const char *, const char *, int);
1142extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1143extern int git_config_rename_section(const char *, const char *);
1144extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1145extern const char *git_etc_gitconfig(void);
1146extern int check_repository_format_version(const char *var, const char *value, void *cb);
1147extern int git_env_bool(const char *, int);
1148extern int git_config_system(void);
1149extern int config_error_nonbool(const char *);
1150#if defined(__GNUC__) && ! defined(__clang__)
1151#define config_error_nonbool(s) (config_error_nonbool(s), -1)
1152#endif
1153extern const char *get_log_output_encoding(void);
1154extern const char *get_commit_output_encoding(void);
1155
1156extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1157
1158struct config_include_data {
1159        int depth;
1160        config_fn_t fn;
1161        void *data;
1162};
1163#define CONFIG_INCLUDE_INIT { 0 }
1164extern int git_config_include(const char *name, const char *value, void *data);
1165
1166/*
1167 * Match and parse a config key of the form:
1168 *
1169 *   section.(subsection.)?key
1170 *
1171 * (i.e., what gets handed to a config_fn_t). The caller provides the section;
1172 * we return -1 if it does not match, 0 otherwise. The subsection and key
1173 * out-parameters are filled by the function (and subsection is NULL if it is
1174 * missing).
1175 */
1176extern int parse_config_key(const char *var,
1177                            const char *section,
1178                            const char **subsection, int *subsection_len,
1179                            const char **key);
1180
1181extern int committer_ident_sufficiently_given(void);
1182extern int author_ident_sufficiently_given(void);
1183
1184extern const char *git_commit_encoding;
1185extern const char *git_log_output_encoding;
1186extern const char *git_mailmap_file;
1187extern const char *git_mailmap_blob;
1188
1189/* IO helper functions */
1190extern void maybe_flush_or_die(FILE *, const char *);
1191extern int copy_fd(int ifd, int ofd);
1192extern int copy_file(const char *dst, const char *src, int mode);
1193extern int copy_file_with_time(const char *dst, const char *src, int mode);
1194extern void write_or_die(int fd, const void *buf, size_t count);
1195extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1196extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1197extern void fsync_or_die(int fd, const char *);
1198
1199extern ssize_t read_in_full(int fd, void *buf, size_t count);
1200extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1201static inline ssize_t write_str_in_full(int fd, const char *str)
1202{
1203        return write_in_full(fd, str, strlen(str));
1204}
1205
1206/* pager.c */
1207extern void setup_pager(void);
1208extern const char *pager_program;
1209extern int pager_in_use(void);
1210extern int pager_use_color;
1211extern int term_columns(void);
1212extern int decimal_width(int);
1213extern int check_pager_config(const char *cmd);
1214
1215extern const char *editor_program;
1216extern const char *askpass_program;
1217extern const char *excludes_file;
1218
1219/* base85 */
1220int decode_85(char *dst, const char *line, int linelen);
1221void encode_85(char *buf, const unsigned char *data, int bytes);
1222
1223/* alloc.c */
1224extern void *alloc_blob_node(void);
1225extern void *alloc_tree_node(void);
1226extern void *alloc_commit_node(void);
1227extern void *alloc_tag_node(void);
1228extern void *alloc_object_node(void);
1229extern void alloc_report(void);
1230
1231/* trace.c */
1232__attribute__((format (printf, 1, 2)))
1233extern void trace_printf(const char *format, ...);
1234__attribute__((format (printf, 2, 3)))
1235extern void trace_argv_printf(const char **argv, const char *format, ...);
1236extern void trace_repo_setup(const char *prefix);
1237extern int trace_want(const char *key);
1238extern void trace_strbuf(const char *key, const struct strbuf *buf);
1239
1240void packet_trace_identity(const char *prog);
1241
1242/* add */
1243/*
1244 * return 0 if success, 1 - if addition of a file failed and
1245 * ADD_FILES_IGNORE_ERRORS was specified in flags
1246 */
1247int add_files_to_cache(const char *prefix, const struct pathspec *pathspec, int flags);
1248
1249/* diff.c */
1250extern int diff_auto_refresh_index;
1251
1252/* match-trees.c */
1253void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1254void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1255
1256/*
1257 * whitespace rules.
1258 * used by both diff and apply
1259 * last two digits are tab width
1260 */
1261#define WS_BLANK_AT_EOL         0100
1262#define WS_SPACE_BEFORE_TAB     0200
1263#define WS_INDENT_WITH_NON_TAB  0400
1264#define WS_CR_AT_EOL           01000
1265#define WS_BLANK_AT_EOF        02000
1266#define WS_TAB_IN_INDENT       04000
1267#define WS_TRAILING_SPACE      (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1268#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1269#define WS_TAB_WIDTH_MASK        077
1270extern unsigned whitespace_rule_cfg;
1271extern unsigned whitespace_rule(const char *);
1272extern unsigned parse_whitespace_rule(const char *);
1273extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1274extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1275extern char *whitespace_error_string(unsigned ws);
1276extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1277extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1278#define ws_tab_width(rule)     ((rule) & WS_TAB_WIDTH_MASK)
1279
1280/* ls-files */
1281int report_path_error(const char *ps_matched, const struct pathspec *pathspec, const char *prefix);
1282void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1283
1284char *alias_lookup(const char *alias);
1285int split_cmdline(char *cmdline, const char ***argv);
1286/* Takes a negative value returned by split_cmdline */
1287const char *split_cmdline_strerror(int cmdline_errno);
1288
1289/* git.c */
1290struct startup_info {
1291        int have_repository;
1292        const char *prefix;
1293};
1294extern struct startup_info *startup_info;
1295
1296/* merge.c */
1297struct commit_list;
1298int try_merge_command(const char *strategy, size_t xopts_nr,
1299                const char **xopts, struct commit_list *common,
1300                const char *head_arg, struct commit_list *remotes);
1301int checkout_fast_forward(const unsigned char *from,
1302                          const unsigned char *to,
1303                          int overwrite_ignore);
1304
1305
1306int sane_execvp(const char *file, char *const argv[]);
1307
1308/*
1309 * A struct to encapsulate the concept of whether a file has changed
1310 * since we last checked it. This uses criteria similar to those used
1311 * for the index.
1312 */
1313struct stat_validity {
1314        struct stat_data *sd;
1315};
1316
1317void stat_validity_clear(struct stat_validity *sv);
1318
1319/*
1320 * Returns 1 if the path is a regular file (or a symlink to a regular
1321 * file) and matches the saved stat_validity, 0 otherwise.  A missing
1322 * or inaccessible file is considered a match if the struct was just
1323 * initialized, or if the previous update found an inaccessible file.
1324 */
1325int stat_validity_check(struct stat_validity *sv, const char *path);
1326
1327/*
1328 * Update the stat_validity from a file opened at descriptor fd. If
1329 * the file is missing, inaccessible, or not a regular file, then
1330 * future calls to stat_validity_check will match iff one of those
1331 * conditions continues to be true.
1332 */
1333void stat_validity_update(struct stat_validity *sv, int fd);
1334
1335#endif /* CACHE_H */