cache.h

   1 #ifndef CACHE_H
   2 #define CACHE_H
   3
   4 #include "git-compat-util.h"
   5 #include "strbuf.h"
   6 #include "hash.h"
   7
   8 #include SHA1_HEADER
   9 #include <zlib.h>
  10
  11 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
  12 #define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  13 #endif
  14
  15 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  16 #define DTYPE(de)       ((de)->d_type)
  17 #else
  18 #undef DT_UNKNOWN
  19 #undef DT_DIR
  20 #undef DT_REG
  21 #undef DT_LNK
  22 #define DT_UNKNOWN      0
  23 #define DT_DIR          1
  24 #define DT_REG          2
  25 #define DT_LNK          3
  26 #define DTYPE(de)       DT_UNKNOWN
  27 #endif
  28
  29 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
  30 #define S_IFINVALID     0030000
  31
  32 /*
  33  * A "directory link" is a link to another git directory.
  34  *
  35  * The value 0160000 is not normally a valid mode, and
  36  * also just happens to be S_IFDIR + S_IFLNK
  37  *
  38  * NOTE! We *really* shouldn't depend on the S_IFxxx macros
  39  * always having the same values everywhere. We should use
  40  * our internal git values for these things, and then we can
  41  * translate that to the OS-specific value. It just so
  42  * happens that everybody shares the same bit representation
  43  * in the UNIX world (and apparently wider too..)
  44  */
  45 #define S_IFGITLINK     0160000
  46 #define S_ISGITLINK(m)  (((m) & S_IFMT) == S_IFGITLINK)
  47
  48 /*
  49  * Intensive research over the course of many years has shown that
  50  * port 9418 is totally unused by anything else. Or
  51  *
  52  *      Your search - "port 9418" - did not match any documents.
  53  *
  54  * as www.google.com puts it.
  55  *
  56  * This port has been properly assigned for git use by IANA:
  57  * git (Assigned-9418) [I06-050728-0001].
  58  *
  59  *      git  9418/tcp   git pack transfer service
  60  *      git  9418/udp   git pack transfer service
  61  *
  62  * with Linus Torvalds <torvalds@osdl.org> as the point of
  63  * contact. September 2005.
  64  *
  65  * See http://www.iana.org/assignments/port-numbers
  66  */
  67 #define DEFAULT_GIT_PORT 9418
  68
  69 /*
  70  * Basic data structures for the directory cache
  71  */
  72
  73 #define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  74 struct cache_header {
  75         unsigned int hdr_signature;
  76         unsigned int hdr_version;
  77         unsigned int hdr_entries;
  78 };
  79
  80 /*
  81  * The "cache_time" is just the low 32 bits of the
  82  * time. It doesn't matter if it overflows - we only
  83  * check it for equality in the 32 bits we save.
  84  */
  85 struct cache_time {
  86         unsigned int sec;
  87         unsigned int nsec;
  88 };
  89
  90 /*
  91  * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  92  * Again - this is just a (very strong in practice) heuristic that
  93  * the inode hasn't changed.
  94  *
  95  * We save the fields in big-endian order to allow using the
  96  * index file over NFS transparently.
  97  */
  98 struct ondisk_cache_entry {
  99         struct cache_time ctime;
 100         struct cache_time mtime;
 101         unsigned int dev;
 102         unsigned int ino;
 103         unsigned int mode;
 104         unsigned int uid;
 105         unsigned int gid;
 106         unsigned int size;
 107         unsigned char sha1[20];
 108         unsigned short flags;
 109         char name[FLEX_ARRAY]; /* more */
 110 };
 111
 112 struct cache_entry {
 113         struct cache_entry *next;
 114         unsigned int ce_ctime;
 115         unsigned int ce_mtime;
 116         unsigned int ce_dev;
 117         unsigned int ce_ino;
 118         unsigned int ce_mode;
 119         unsigned int ce_uid;
 120         unsigned int ce_gid;
 121         unsigned int ce_size;
 122         unsigned int ce_flags;
 123         unsigned char sha1[20];
 124         char name[FLEX_ARRAY]; /* more */
 125 };
 126
 127 #define CE_NAMEMASK  (0x0fff)
 128 #define CE_STAGEMASK (0x3000)
 129 #define CE_VALID     (0x8000)
 130 #define CE_STAGESHIFT 12
 131
 132 /* In-memory only */
 133 #define CE_UPDATE    (0x10000)
 134 #define CE_REMOVE    (0x20000)
 135 #define CE_UPTODATE  (0x40000)
 136 #define CE_UNHASHED  (0x80000)
 137
 138 static inline unsigned create_ce_flags(size_t len, unsigned stage)
 139 {
 140         if (len >= CE_NAMEMASK)
 141                 len = CE_NAMEMASK;
 142         return (len | (stage << CE_STAGESHIFT));
 143 }
 144
 145 static inline size_t ce_namelen(const struct cache_entry *ce)
 146 {
 147         size_t len = ce->ce_flags & CE_NAMEMASK;
 148         if (len < CE_NAMEMASK)
 149                 return len;
 150         return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 151 }
 152
 153 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 154 #define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
 155 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 156 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
 157 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
 158
 159 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 160 static inline unsigned int create_ce_mode(unsigned int mode)
 161 {
 162         if (S_ISLNK(mode))
 163                 return S_IFLNK;
 164         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 165                 return S_IFGITLINK;
 166         return S_IFREG | ce_permissions(mode);
 167 }
 168 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 169 {
 170         extern int trust_executable_bit, has_symlinks;
 171         if (!has_symlinks && S_ISREG(mode) &&
 172             ce && S_ISLNK(ce->ce_mode))
 173                 return ce->ce_mode;
 174         if (!trust_executable_bit && S_ISREG(mode)) {
 175                 if (ce && S_ISREG(ce->ce_mode))
 176                         return ce->ce_mode;
 177                 return create_ce_mode(0666);
 178         }
 179         return create_ce_mode(mode);
 180 }
 181 #define canon_mode(mode) \
 182         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 183         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 184
 185 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 186 #define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
 187
 188 struct index_state {
 189         struct cache_entry **cache;
 190         unsigned int cache_nr, cache_alloc, cache_changed;
 191         struct cache_tree *cache_tree;
 192         time_t timestamp;
 193         void *alloc;
 194         unsigned name_hash_initialized : 1;
 195         struct hash_table name_hash;
 196 };
 197
 198 extern struct index_state the_index;
 199
 200 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 201 #define active_cache (the_index.cache)
 202 #define active_nr (the_index.cache_nr)
 203 #define active_alloc (the_index.cache_alloc)
 204 #define active_cache_changed (the_index.cache_changed)
 205 #define active_cache_tree (the_index.cache_tree)
 206
 207 #define read_cache() read_index(&the_index)
 208 #define read_cache_from(path) read_index_from(&the_index, (path))
 209 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 210 #define discard_cache() discard_index(&the_index)
 211 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 212 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 213 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 214 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 215 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 216 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 217 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 218 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 219 #define cache_name_exists(name, namelen) index_name_exists(&the_index, (name), (namelen))
 220 #endif
 221
 222 enum object_type {
 223         OBJ_BAD = -1,
 224         OBJ_NONE = 0,
 225         OBJ_COMMIT = 1,
 226         OBJ_TREE = 2,
 227         OBJ_BLOB = 3,
 228         OBJ_TAG = 4,
 229         /* 5 for future expansion */
 230         OBJ_OFS_DELTA = 6,
 231         OBJ_REF_DELTA = 7,
 232         OBJ_MAX,
 233 };
 234
 235 static inline enum object_type object_type(unsigned int mode)
 236 {
 237         return S_ISDIR(mode) ? OBJ_TREE :
 238                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 239                 OBJ_BLOB;
 240 }
 241
 242 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 243 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 244 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 245 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 246 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 247 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 248 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 249 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 250 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 251 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 252 #define GITATTRIBUTES_FILE ".gitattributes"
 253 #define INFOATTRIBUTES_FILE "info/attributes"
 254 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 255
 256 extern int is_bare_repository_cfg;
 257 extern int is_bare_repository(void);
 258 extern int is_inside_git_dir(void);
 259 extern char *git_work_tree_cfg;
 260 extern int is_inside_work_tree(void);
 261 extern const char *get_git_dir(void);
 262 extern char *get_object_directory(void);
 263 extern char *get_refs_directory(void);
 264 extern char *get_index_file(void);
 265 extern char *get_graft_file(void);
 266 extern int set_git_dir(const char *path);
 267 extern const char *get_git_work_tree(void);
 268
 269 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 270
 271 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 272 extern void setup_work_tree(void);
 273 extern const char *setup_git_directory_gently(int *);
 274 extern const char *setup_git_directory(void);
 275 extern const char *prefix_path(const char *prefix, int len, const char *path);
 276 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 277 extern void verify_filename(const char *prefix, const char *name);
 278 extern void verify_non_filename(const char *prefix, const char *name);
 279
 280 #define alloc_nr(x) (((x)+16)*3/2)
 281
 282 /*
 283  * Realloc the buffer pointed at by variable 'x' so that it can hold
 284  * at least 'nr' entries; the number of entries currently allocated
 285  * is 'alloc', using the standard growing factor alloc_nr() macro.
 286  *
 287  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 288  */
 289 #define ALLOC_GROW(x, nr, alloc) \
 290         do { \
 291                 if ((nr) > alloc) { \
 292                         if (alloc_nr(alloc) < (nr)) \
 293                                 alloc = (nr); \
 294                         else \
 295                                 alloc = alloc_nr(alloc); \
 296                         x = xrealloc((x), alloc * sizeof(*(x))); \
 297                 } \
 298         } while(0)
 299
 300 /* Initialize and use the cache information */
 301 extern int read_index(struct index_state *);
 302 extern int read_index_from(struct index_state *, const char *path);
 303 extern int write_index(struct index_state *, int newfd);
 304 extern int discard_index(struct index_state *);
 305 extern int verify_path(const char *path);
 306 extern int index_name_exists(struct index_state *istate, const char *name, int namelen);
 307 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 308 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 309 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 310 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 311 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 312 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 313 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 314 extern int remove_index_entry_at(struct index_state *, int pos);
 315 extern int remove_file_from_index(struct index_state *, const char *path);
 316 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 317 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 318 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 319
 320 /* do stat comparison even if CE_VALID is true */
 321 #define CE_MATCH_IGNORE_VALID           01
 322 /* do not check the contents but report dirty on racily-clean entries */
 323 #define CE_MATCH_RACY_IS_DIRTY  02
 324 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 325 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 326
 327 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 328 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 329 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 330 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 331 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 332
 333 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 334 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 335 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 336 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 337 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 338
 339 struct lock_file {
 340         struct lock_file *next;
 341         int fd;
 342         pid_t owner;
 343         char on_list;
 344         char filename[PATH_MAX];
 345 };
 346 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 347 extern int commit_lock_file(struct lock_file *);
 348
 349 extern int hold_locked_index(struct lock_file *, int);
 350 extern int commit_locked_index(struct lock_file *);
 351 extern void set_alternate_index_output(const char *);
 352 extern int close_lock_file(struct lock_file *);
 353 extern void rollback_lock_file(struct lock_file *);
 354 extern int delete_ref(const char *, const unsigned char *sha1);
 355
 356 /* Environment bits from configuration mechanism */
 357 extern int trust_executable_bit;
 358 extern int quote_path_fully;
 359 extern int has_symlinks;
 360 extern int assume_unchanged;
 361 extern int prefer_symlink_refs;
 362 extern int log_all_ref_updates;
 363 extern int warn_ambiguous_refs;
 364 extern int shared_repository;
 365 extern const char *apply_default_whitespace;
 366 extern int zlib_compression_level;
 367 extern int core_compression_level;
 368 extern int core_compression_seen;
 369 extern size_t packed_git_window_size;
 370 extern size_t packed_git_limit;
 371 extern size_t delta_base_cache_limit;
 372 extern int auto_crlf;
 373
 374 #define GIT_REPO_VERSION 0
 375 extern int repository_format_version;
 376 extern int check_repository_format(void);
 377
 378 #define MTIME_CHANGED   0x0001
 379 #define CTIME_CHANGED   0x0002
 380 #define OWNER_CHANGED   0x0004
 381 #define MODE_CHANGED    0x0008
 382 #define INODE_CHANGED   0x0010
 383 #define DATA_CHANGED    0x0020
 384 #define TYPE_CHANGED    0x0040
 385
 386 /* Return a statically allocated filename matching the sha1 signature */
 387 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 388 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 389 extern char *sha1_file_name(const unsigned char *sha1);
 390 extern char *sha1_pack_name(const unsigned char *sha1);
 391 extern char *sha1_pack_index_name(const unsigned char *sha1);
 392 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 393 extern const unsigned char null_sha1[20];
 394 static inline int is_null_sha1(const unsigned char *sha1)
 395 {
 396         return !memcmp(sha1, null_sha1, 20);
 397 }
 398 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 399 {
 400         return memcmp(sha1, sha2, 20);
 401 }
 402 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 403 {
 404         memcpy(sha_dst, sha_src, 20);
 405 }
 406 static inline void hashclr(unsigned char *hash)
 407 {
 408         memset(hash, 0, 20);
 409 }
 410
 411 int git_mkstemp(char *path, size_t n, const char *template);
 412
 413 enum sharedrepo {
 414         PERM_UMASK = 0,
 415         PERM_GROUP,
 416         PERM_EVERYBODY
 417 };
 418 int git_config_perm(const char *var, const char *value);
 419 int adjust_shared_perm(const char *path);
 420 int safe_create_leading_directories(char *path);
 421 char *enter_repo(char *path, int strict);
 422 static inline int is_absolute_path(const char *path)
 423 {
 424         return path[0] == '/';
 425 }
 426 const char *make_absolute_path(const char *path);
 427
 428 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 429 extern int sha1_object_info(const unsigned char *, unsigned long *);
 430 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 431 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 432 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 433 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 434
 435 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 436
 437 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 438                               size_t bufsize, size_t *bufposn);
 439 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 440 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 441
 442 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 443 extern int has_sha1_file(const unsigned char *sha1);
 444
 445 extern int has_pack_file(const unsigned char *sha1);
 446 extern int has_pack_index(const unsigned char *sha1);
 447
 448 extern const signed char hexval_table[256];
 449 static inline unsigned int hexval(unsigned char c)
 450 {
 451         return hexval_table[c];
 452 }
 453
 454 /* Convert to/from hex/sha1 representation */
 455 #define MINIMUM_ABBREV 4
 456 #define DEFAULT_ABBREV 7
 457
 458 extern int get_sha1(const char *str, unsigned char *sha1);
 459 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 460 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 461 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 462 extern int read_ref(const char *filename, unsigned char *sha1);
 463 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 464 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 465 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 466
 467 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 468 extern const char *ref_rev_parse_rules[];
 469 extern const char *ref_fetch_rules[];
 470
 471 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 472 extern int validate_headref(const char *ref);
 473
 474 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 475 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 476
 477 extern void *read_object_with_reference(const unsigned char *sha1,
 478                                         const char *required_type,
 479                                         unsigned long *size,
 480                                         unsigned char *sha1_ret);
 481
 482 enum date_mode {
 483         DATE_NORMAL = 0,
 484         DATE_RELATIVE,
 485         DATE_SHORT,
 486         DATE_LOCAL,
 487         DATE_ISO8601,
 488         DATE_RFC2822
 489 };
 490
 491 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 492 int parse_date(const char *date, char *buf, int bufsize);
 493 void datestamp(char *buf, int bufsize);
 494 unsigned long approxidate(const char *);
 495 enum date_mode parse_date_format(const char *format);
 496
 497 #define IDENT_WARN_ON_NO_NAME  1
 498 #define IDENT_ERROR_ON_NO_NAME 2
 499 #define IDENT_NO_DATE          4
 500 extern const char *git_author_info(int);
 501 extern const char *git_committer_info(int);
 502 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 503 extern const char *fmt_name(const char *name, const char *email);
 504
 505 struct checkout {
 506         const char *base_dir;
 507         int base_dir_len;
 508         unsigned force:1,
 509                  quiet:1,
 510                  not_new:1,
 511                  refresh_cache:1;
 512 };
 513
 514 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 515 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 516
 517 extern struct alternate_object_database {
 518         struct alternate_object_database *next;
 519         char *name;
 520         char base[FLEX_ARRAY]; /* more */
 521 } *alt_odb_list;
 522 extern void prepare_alt_odb(void);
 523
 524 struct pack_window {
 525         struct pack_window *next;
 526         unsigned char *base;
 527         off_t offset;
 528         size_t len;
 529         unsigned int last_used;
 530         unsigned int inuse_cnt;
 531 };
 532
 533 extern struct packed_git {
 534         struct packed_git *next;
 535         struct pack_window *windows;
 536         off_t pack_size;
 537         const void *index_data;
 538         size_t index_size;
 539         uint32_t num_objects;
 540         int index_version;
 541         time_t mtime;
 542         int pack_fd;
 543         int pack_local;
 544         unsigned char sha1[20];
 545         /* something like ".git/objects/pack/xxxxx.pack" */
 546         char pack_name[FLEX_ARRAY]; /* more */
 547 } *packed_git;
 548
 549 struct pack_entry {
 550         off_t offset;
 551         unsigned char sha1[20];
 552         struct packed_git *p;
 553 };
 554
 555 struct ref {
 556         struct ref *next;
 557         unsigned char old_sha1[20];
 558         unsigned char new_sha1[20];
 559         unsigned int force:1,
 560                 merge:1,
 561                 nonfastforward:1,
 562                 deletion:1;
 563         enum {
 564                 REF_STATUS_NONE = 0,
 565                 REF_STATUS_OK,
 566                 REF_STATUS_REJECT_NONFASTFORWARD,
 567                 REF_STATUS_REJECT_NODELETE,
 568                 REF_STATUS_UPTODATE,
 569                 REF_STATUS_REMOTE_REJECT,
 570                 REF_STATUS_EXPECTING_REPORT,
 571         } status;
 572         char *remote_status;
 573         struct ref *peer_ref; /* when renaming */
 574         char name[FLEX_ARRAY]; /* more */
 575 };
 576
 577 #define REF_NORMAL      (1u << 0)
 578 #define REF_HEADS       (1u << 1)
 579 #define REF_TAGS        (1u << 2)
 580
 581 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 582
 583 #define CONNECT_VERBOSE       (1u << 0)
 584 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 585 extern int finish_connect(struct child_process *conn);
 586 extern int path_match(const char *path, int nr, char **match);
 587 extern int get_ack(int fd, unsigned char *result_sha1);
 588 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 589 extern int server_supports(const char *feature);
 590
 591 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 592 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 593                                                 const char *idx_path);
 594
 595 extern void prepare_packed_git(void);
 596 extern void reprepare_packed_git(void);
 597 extern void install_packed_git(struct packed_git *pack);
 598
 599 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 600                                          struct packed_git *packs);
 601
 602 extern void pack_report(void);
 603 extern int open_pack_index(struct packed_git *);
 604 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 605 extern void close_pack_windows(struct packed_git *);
 606 extern void unuse_pack(struct pack_window **);
 607 extern struct packed_git *add_packed_git(const char *, int, int);
 608 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 609 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 610 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 611 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 612 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 613 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 614 extern int matches_pack_name(struct packed_git *p, const char *name);
 615
 616 /* Dumb servers support */
 617 extern int update_server_info(int);
 618
 619 typedef int (*config_fn_t)(const char *, const char *);
 620 extern int git_default_config(const char *, const char *);
 621 extern int git_config_from_file(config_fn_t fn, const char *);
 622 extern int git_config(config_fn_t fn);
 623 extern int git_parse_long(const char *, long *);
 624 extern int git_parse_ulong(const char *, unsigned long *);
 625 extern int git_config_int(const char *, const char *);
 626 extern unsigned long git_config_ulong(const char *, const char *);
 627 extern int git_config_bool(const char *, const char *);
 628 extern int git_config_set(const char *, const char *);
 629 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 630 extern int git_config_rename_section(const char *, const char *);
 631 extern const char *git_etc_gitconfig(void);
 632 extern int check_repository_format_version(const char *var, const char *value);
 633 extern int config_error_nonbool(const char *);
 634
 635 #define MAX_GITNAME (1000)
 636 extern char git_default_email[MAX_GITNAME];
 637 extern char git_default_name[MAX_GITNAME];
 638
 639 extern const char *git_commit_encoding;
 640 extern const char *git_log_output_encoding;
 641
 642 /* IO helper functions */
 643 extern void maybe_flush_or_die(FILE *, const char *);
 644 extern int copy_fd(int ifd, int ofd);
 645 extern int read_in_full(int fd, void *buf, size_t count);
 646 extern int write_in_full(int fd, const void *buf, size_t count);
 647 extern void write_or_die(int fd, const void *buf, size_t count);
 648 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 649 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 650
 651 /* pager.c */
 652 extern void setup_pager(void);
 653 extern char *pager_program;
 654 extern int pager_in_use(void);
 655 extern int pager_use_color;
 656
 657 extern char *editor_program;
 658 extern char *excludes_file;
 659
 660 /* base85 */
 661 int decode_85(char *dst, const char *line, int linelen);
 662 void encode_85(char *buf, const unsigned char *data, int bytes);
 663
 664 /* alloc.c */
 665 extern void *alloc_blob_node(void);
 666 extern void *alloc_tree_node(void);
 667 extern void *alloc_commit_node(void);
 668 extern void *alloc_tag_node(void);
 669 extern void *alloc_object_node(void);
 670 extern void alloc_report(void);
 671
 672 /* trace.c */
 673 extern void trace_printf(const char *format, ...);
 674 extern void trace_argv_printf(const char **argv, const char *format, ...);
 675
 676 /* convert.c */
 677 /* returns 1 if *dst was used */
 678 extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 679 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 680
 681 /* add */
 682 void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 683
 684 /* diff.c */
 685 extern int diff_auto_refresh_index;
 686
 687 /* match-trees.c */
 688 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 689
 690 /*
 691  * whitespace rules.
 692  * used by both diff and apply
 693  */
 694 #define WS_TRAILING_SPACE       01
 695 #define WS_SPACE_BEFORE_TAB     02
 696 #define WS_INDENT_WITH_NON_TAB  04
 697 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 698 extern unsigned whitespace_rule_cfg;
 699 extern unsigned whitespace_rule(const char *);
 700 extern unsigned parse_whitespace_rule(const char *);
 701 extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 702     FILE *stream, const char *set,
 703     const char *reset, const char *ws);
 704 extern char *whitespace_error_string(unsigned ws);
 705
 706 /* ls-files */
 707 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 708 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 709 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 710
 711 #endif /* CACHE_H */