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 cache_entry {
  98         struct cache_time ce_ctime;
  99         struct cache_time ce_mtime;
 100         unsigned int ce_dev;
 101         unsigned int ce_ino;
 102         unsigned int ce_mode;
 103         unsigned int ce_uid;
 104         unsigned int ce_gid;
 105         unsigned int ce_size;
 106         unsigned char sha1[20];
 107         unsigned short ce_flags;
 108         char name[FLEX_ARRAY]; /* more */
 109 };
 110
 111 #define CE_NAMEMASK  (0x0fff)
 112 #define CE_STAGEMASK (0x3000)
 113 #define CE_UPDATE    (0x4000)
 114 #define CE_VALID     (0x8000)
 115 #define CE_STAGESHIFT 12
 116
 117 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
 118 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
 119 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
 120 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 121
 122 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 123 static inline unsigned int create_ce_mode(unsigned int mode)
 124 {
 125         if (S_ISLNK(mode))
 126                 return htonl(S_IFLNK);
 127         if (S_ISDIR(mode) || S_ISGITLINK(mode))
 128                 return htonl(S_IFGITLINK);
 129         return htonl(S_IFREG | ce_permissions(mode));
 130 }
 131 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 132 {
 133         extern int trust_executable_bit, has_symlinks;
 134         if (!has_symlinks && S_ISREG(mode) &&
 135             ce && S_ISLNK(ntohl(ce->ce_mode)))
 136                 return ce->ce_mode;
 137         if (!trust_executable_bit && S_ISREG(mode)) {
 138                 if (ce && S_ISREG(ntohl(ce->ce_mode)))
 139                         return ce->ce_mode;
 140                 return create_ce_mode(0666);
 141         }
 142         return create_ce_mode(mode);
 143 }
 144 #define canon_mode(mode) \
 145         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 146         S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 147
 148 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 149
 150 struct index_state {
 151         struct cache_entry **cache;
 152         unsigned int cache_nr, cache_alloc, cache_changed;
 153         struct cache_tree *cache_tree;
 154         time_t timestamp;
 155         void *mmap;
 156         size_t mmap_size;
 157 };
 158
 159 extern struct index_state the_index;
 160
 161 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 162 #define active_cache (the_index.cache)
 163 #define active_nr (the_index.cache_nr)
 164 #define active_alloc (the_index.cache_alloc)
 165 #define active_cache_changed (the_index.cache_changed)
 166 #define active_cache_tree (the_index.cache_tree)
 167
 168 #define read_cache() read_index(&the_index)
 169 #define read_cache_from(path) read_index_from(&the_index, (path))
 170 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 171 #define discard_cache() discard_index(&the_index)
 172 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 173 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 174 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 175 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 176 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 177 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 178 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 179 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 180 #endif
 181
 182 enum object_type {
 183         OBJ_BAD = -1,
 184         OBJ_NONE = 0,
 185         OBJ_COMMIT = 1,
 186         OBJ_TREE = 2,
 187         OBJ_BLOB = 3,
 188         OBJ_TAG = 4,
 189         /* 5 for future expansion */
 190         OBJ_OFS_DELTA = 6,
 191         OBJ_REF_DELTA = 7,
 192         OBJ_MAX,
 193 };
 194
 195 static inline enum object_type object_type(unsigned int mode)
 196 {
 197         return S_ISDIR(mode) ? OBJ_TREE :
 198                 S_ISGITLINK(mode) ? OBJ_COMMIT :
 199                 OBJ_BLOB;
 200 }
 201
 202 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 203 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 204 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 205 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 206 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 207 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 208 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 209 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 210 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 211 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 212 #define GITATTRIBUTES_FILE ".gitattributes"
 213 #define INFOATTRIBUTES_FILE "info/attributes"
 214 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 215
 216 extern int is_bare_repository_cfg;
 217 extern int is_bare_repository(void);
 218 extern int is_inside_git_dir(void);
 219 extern char *git_work_tree_cfg;
 220 extern int is_inside_work_tree(void);
 221 extern const char *get_git_dir(void);
 222 extern char *get_object_directory(void);
 223 extern char *get_refs_directory(void);
 224 extern char *get_index_file(void);
 225 extern char *get_graft_file(void);
 226 extern int set_git_dir(const char *path);
 227 extern const char *get_git_work_tree(void);
 228
 229 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 230
 231 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 232 extern void setup_work_tree(void);
 233 extern const char *setup_git_directory_gently(int *);
 234 extern const char *setup_git_directory(void);
 235 extern const char *prefix_path(const char *prefix, int len, const char *path);
 236 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 237 extern void verify_filename(const char *prefix, const char *name);
 238 extern void verify_non_filename(const char *prefix, const char *name);
 239
 240 #define alloc_nr(x) (((x)+16)*3/2)
 241
 242 /*
 243  * Realloc the buffer pointed at by variable 'x' so that it can hold
 244  * at least 'nr' entries; the number of entries currently allocated
 245  * is 'alloc', using the standard growing factor alloc_nr() macro.
 246  *
 247  * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 248  */
 249 #define ALLOC_GROW(x, nr, alloc) \
 250         do { \
 251                 if ((nr) > alloc) { \
 252                         if (alloc_nr(alloc) < (nr)) \
 253                                 alloc = (nr); \
 254                         else \
 255                                 alloc = alloc_nr(alloc); \
 256                         x = xrealloc((x), alloc * sizeof(*(x))); \
 257                 } \
 258         } while(0)
 259
 260 /* Initialize and use the cache information */
 261 extern int read_index(struct index_state *);
 262 extern int read_index_from(struct index_state *, const char *path);
 263 extern int write_index(struct index_state *, int newfd);
 264 extern int discard_index(struct index_state *);
 265 extern int verify_path(const char *path);
 266 extern int index_name_pos(struct index_state *, const char *name, int namelen);
 267 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 268 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 269 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 270 #define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 271 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 272 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 273 extern int remove_index_entry_at(struct index_state *, int pos);
 274 extern int remove_file_from_index(struct index_state *, const char *path);
 275 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 276 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 277 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 278
 279 /* do stat comparison even if CE_VALID is true */
 280 #define CE_MATCH_IGNORE_VALID           01
 281 /* do not check the contents but report dirty on racily-clean entries */
 282 #define CE_MATCH_RACY_IS_DIRTY  02
 283 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 284 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 285
 286 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 287 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 288 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 289 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 290 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 291
 292 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 293 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 294 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 295 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 296 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 297
 298 struct lock_file {
 299         struct lock_file *next;
 300         int fd;
 301         pid_t owner;
 302         char on_list;
 303         char filename[PATH_MAX];
 304 };
 305 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 306 extern int commit_lock_file(struct lock_file *);
 307
 308 extern int hold_locked_index(struct lock_file *, int);
 309 extern int commit_locked_index(struct lock_file *);
 310 extern void set_alternate_index_output(const char *);
 311 extern int close_lock_file(struct lock_file *);
 312 extern void rollback_lock_file(struct lock_file *);
 313 extern int delete_ref(const char *, const unsigned char *sha1);
 314
 315 /* Environment bits from configuration mechanism */
 316 extern int trust_executable_bit;
 317 extern int quote_path_fully;
 318 extern int has_symlinks;
 319 extern int assume_unchanged;
 320 extern int prefer_symlink_refs;
 321 extern int log_all_ref_updates;
 322 extern int warn_ambiguous_refs;
 323 extern int shared_repository;
 324 extern const char *apply_default_whitespace;
 325 extern int zlib_compression_level;
 326 extern int core_compression_level;
 327 extern int core_compression_seen;
 328 extern size_t packed_git_window_size;
 329 extern size_t packed_git_limit;
 330 extern size_t delta_base_cache_limit;
 331 extern int auto_crlf;
 332
 333 #define GIT_REPO_VERSION 0
 334 extern int repository_format_version;
 335 extern int check_repository_format(void);
 336
 337 #define MTIME_CHANGED   0x0001
 338 #define CTIME_CHANGED   0x0002
 339 #define OWNER_CHANGED   0x0004
 340 #define MODE_CHANGED    0x0008
 341 #define INODE_CHANGED   0x0010
 342 #define DATA_CHANGED    0x0020
 343 #define TYPE_CHANGED    0x0040
 344
 345 /* Return a statically allocated filename matching the sha1 signature */
 346 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 347 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 348 extern char *sha1_file_name(const unsigned char *sha1);
 349 extern char *sha1_pack_name(const unsigned char *sha1);
 350 extern char *sha1_pack_index_name(const unsigned char *sha1);
 351 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 352 extern const unsigned char null_sha1[20];
 353 static inline int is_null_sha1(const unsigned char *sha1)
 354 {
 355         return !memcmp(sha1, null_sha1, 20);
 356 }
 357 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 358 {
 359         return memcmp(sha1, sha2, 20);
 360 }
 361 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 362 {
 363         memcpy(sha_dst, sha_src, 20);
 364 }
 365 static inline void hashclr(unsigned char *hash)
 366 {
 367         memset(hash, 0, 20);
 368 }
 369
 370 int git_mkstemp(char *path, size_t n, const char *template);
 371
 372 enum sharedrepo {
 373         PERM_UMASK = 0,
 374         PERM_GROUP,
 375         PERM_EVERYBODY
 376 };
 377 int git_config_perm(const char *var, const char *value);
 378 int adjust_shared_perm(const char *path);
 379 int safe_create_leading_directories(char *path);
 380 char *enter_repo(char *path, int strict);
 381 static inline int is_absolute_path(const char *path)
 382 {
 383         return path[0] == '/';
 384 }
 385 const char *make_absolute_path(const char *path);
 386
 387 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 388 extern int sha1_object_info(const unsigned char *, unsigned long *);
 389 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 390 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 391 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 392 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 393
 394 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 395
 396 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 397                               size_t bufsize, size_t *bufposn);
 398 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 399 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 400
 401 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 402 extern int has_sha1_file(const unsigned char *sha1);
 403
 404 extern int has_pack_file(const unsigned char *sha1);
 405 extern int has_pack_index(const unsigned char *sha1);
 406
 407 extern const signed char hexval_table[256];
 408 static inline unsigned int hexval(unsigned char c)
 409 {
 410         return hexval_table[c];
 411 }
 412
 413 /* Convert to/from hex/sha1 representation */
 414 #define MINIMUM_ABBREV 4
 415 #define DEFAULT_ABBREV 7
 416
 417 extern int get_sha1(const char *str, unsigned char *sha1);
 418 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 419 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 420 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 421 extern int read_ref(const char *filename, unsigned char *sha1);
 422 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 423 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 424 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 425
 426 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 427 extern const char *ref_rev_parse_rules[];
 428 extern const char *ref_fetch_rules[];
 429
 430 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 431 extern int validate_headref(const char *ref);
 432
 433 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 434 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 435
 436 extern void *read_object_with_reference(const unsigned char *sha1,
 437                                         const char *required_type,
 438                                         unsigned long *size,
 439                                         unsigned char *sha1_ret);
 440
 441 enum date_mode {
 442         DATE_NORMAL = 0,
 443         DATE_RELATIVE,
 444         DATE_SHORT,
 445         DATE_LOCAL,
 446         DATE_ISO8601,
 447         DATE_RFC2822
 448 };
 449
 450 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 451 int parse_date(const char *date, char *buf, int bufsize);
 452 void datestamp(char *buf, int bufsize);
 453 unsigned long approxidate(const char *);
 454 enum date_mode parse_date_format(const char *format);
 455
 456 #define IDENT_WARN_ON_NO_NAME  1
 457 #define IDENT_ERROR_ON_NO_NAME 2
 458 #define IDENT_NO_DATE          4
 459 extern const char *git_author_info(int);
 460 extern const char *git_committer_info(int);
 461 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 462 extern const char *fmt_name(const char *name, const char *email);
 463
 464 struct checkout {
 465         const char *base_dir;
 466         int base_dir_len;
 467         unsigned force:1,
 468                  quiet:1,
 469                  not_new:1,
 470                  refresh_cache:1;
 471 };
 472
 473 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 474 extern int has_symlink_leading_path(const char *name, char *last_symlink);
 475
 476 extern struct alternate_object_database {
 477         struct alternate_object_database *next;
 478         char *name;
 479         char base[FLEX_ARRAY]; /* more */
 480 } *alt_odb_list;
 481 extern void prepare_alt_odb(void);
 482
 483 struct pack_window {
 484         struct pack_window *next;
 485         unsigned char *base;
 486         off_t offset;
 487         size_t len;
 488         unsigned int last_used;
 489         unsigned int inuse_cnt;
 490 };
 491
 492 extern struct packed_git {
 493         struct packed_git *next;
 494         struct pack_window *windows;
 495         off_t pack_size;
 496         const void *index_data;
 497         size_t index_size;
 498         uint32_t num_objects;
 499         int index_version;
 500         time_t mtime;
 501         int pack_fd;
 502         int pack_local;
 503         unsigned char sha1[20];
 504         /* something like ".git/objects/pack/xxxxx.pack" */
 505         char pack_name[FLEX_ARRAY]; /* more */
 506 } *packed_git;
 507
 508 struct pack_entry {
 509         off_t offset;
 510         unsigned char sha1[20];
 511         struct packed_git *p;
 512 };
 513
 514 struct ref {
 515         struct ref *next;
 516         unsigned char old_sha1[20];
 517         unsigned char new_sha1[20];
 518         unsigned int force:1,
 519                 merge:1,
 520                 nonfastforward:1,
 521                 deletion:1;
 522         enum {
 523                 REF_STATUS_NONE = 0,
 524                 REF_STATUS_OK,
 525                 REF_STATUS_REJECT_NONFASTFORWARD,
 526                 REF_STATUS_REJECT_NODELETE,
 527                 REF_STATUS_UPTODATE,
 528                 REF_STATUS_REMOTE_REJECT,
 529                 REF_STATUS_EXPECTING_REPORT,
 530         } status;
 531         char *remote_status;
 532         struct ref *peer_ref; /* when renaming */
 533         char name[FLEX_ARRAY]; /* more */
 534 };
 535
 536 #define REF_NORMAL      (1u << 0)
 537 #define REF_HEADS       (1u << 1)
 538 #define REF_TAGS        (1u << 2)
 539
 540 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 541
 542 #define CONNECT_VERBOSE       (1u << 0)
 543 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 544 extern int finish_connect(struct child_process *conn);
 545 extern int path_match(const char *path, int nr, char **match);
 546 extern int get_ack(int fd, unsigned char *result_sha1);
 547 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 548 extern int server_supports(const char *feature);
 549
 550 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 551 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 552                                                 const char *idx_path);
 553
 554 extern void prepare_packed_git(void);
 555 extern void reprepare_packed_git(void);
 556 extern void install_packed_git(struct packed_git *pack);
 557
 558 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 559                                          struct packed_git *packs);
 560
 561 extern void pack_report(void);
 562 extern int open_pack_index(struct packed_git *);
 563 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 564 extern void close_pack_windows(struct packed_git *);
 565 extern void unuse_pack(struct pack_window **);
 566 extern struct packed_git *add_packed_git(const char *, int, int);
 567 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 568 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 569 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 570 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 571 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 572 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 573 extern int matches_pack_name(struct packed_git *p, const char *name);
 574
 575 /* Dumb servers support */
 576 extern int update_server_info(int);
 577
 578 typedef int (*config_fn_t)(const char *, const char *);
 579 extern int git_default_config(const char *, const char *);
 580 extern int git_config_from_file(config_fn_t fn, const char *);
 581 extern int git_config(config_fn_t fn);
 582 extern int git_parse_long(const char *, long *);
 583 extern int git_parse_ulong(const char *, unsigned long *);
 584 extern int git_config_int(const char *, const char *);
 585 extern unsigned long git_config_ulong(const char *, const char *);
 586 extern int git_config_bool(const char *, const char *);
 587 extern int git_config_string(const char **, const char *, const char *);
 588 extern int git_config_set(const char *, const char *);
 589 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 590 extern int git_config_rename_section(const char *, const char *);
 591 extern const char *git_etc_gitconfig(void);
 592 extern int check_repository_format_version(const char *var, const char *value);
 593 extern int config_error_nonbool(const char *);
 594
 595 #define MAX_GITNAME (1000)
 596 extern char git_default_email[MAX_GITNAME];
 597 extern char git_default_name[MAX_GITNAME];
 598
 599 extern const char *git_commit_encoding;
 600 extern const char *git_log_output_encoding;
 601
 602 /* IO helper functions */
 603 extern void maybe_flush_or_die(FILE *, const char *);
 604 extern int copy_fd(int ifd, int ofd);
 605 extern int copy_file(const char *dst, const char *src, int mode);
 606 extern int read_in_full(int fd, void *buf, size_t count);
 607 extern int write_in_full(int fd, const void *buf, size_t count);
 608 extern void write_or_die(int fd, const void *buf, size_t count);
 609 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 610 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 611
 612 /* pager.c */
 613 extern void setup_pager(void);
 614 extern const char *pager_program;
 615 extern int pager_in_use(void);
 616 extern int pager_use_color;
 617
 618 extern const char *editor_program;
 619 extern const char *excludes_file;
 620
 621 /* base85 */
 622 int decode_85(char *dst, const char *line, int linelen);
 623 void encode_85(char *buf, const unsigned char *data, int bytes);
 624
 625 /* alloc.c */
 626 extern void *alloc_blob_node(void);
 627 extern void *alloc_tree_node(void);
 628 extern void *alloc_commit_node(void);
 629 extern void *alloc_tag_node(void);
 630 extern void *alloc_object_node(void);
 631 extern void alloc_report(void);
 632
 633 /* trace.c */
 634 extern void trace_printf(const char *format, ...);
 635 extern void trace_argv_printf(const char **argv, const char *format, ...);
 636
 637 /* convert.c */
 638 /* returns 1 if *dst was used */
 639 extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 640 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 641
 642 /* add */
 643 void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 644
 645 /* diff.c */
 646 extern int diff_auto_refresh_index;
 647
 648 /* match-trees.c */
 649 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 650
 651 /*
 652  * whitespace rules.
 653  * used by both diff and apply
 654  */
 655 #define WS_TRAILING_SPACE       01
 656 #define WS_SPACE_BEFORE_TAB     02
 657 #define WS_INDENT_WITH_NON_TAB  04
 658 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 659 extern unsigned whitespace_rule_cfg;
 660 extern unsigned whitespace_rule(const char *);
 661 extern unsigned parse_whitespace_rule(const char *);
 662 extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 663     FILE *stream, const char *set,
 664     const char *reset, const char *ws);
 665 extern char *whitespace_error_string(unsigned ws);
 666
 667 /* ls-files */
 668 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 669 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 670 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 671
 672 #endif /* CACHE_H */