cache.h

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