Andrew's git - gitweb.git/blob

   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" */
  73struct 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 */
  84struct 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 */
  97struct 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
 111struct 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
 134static inline unsigned create_ce_flags(size_t len, unsigned stage)
 135{
 136        if (len >= CE_NAMEMASK)
 137                len = CE_NAMEMASK;
 138        return (len | (stage << CE_STAGESHIFT));
 139}
 140
 141static inline size_t ce_namelen(const struct cache_entry *ce)
 142{
 143        size_t len = ce->ce_flags & CE_NAMEMASK;
 144        if (len < CE_NAMEMASK)
 145                return len;
 146        return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
 147}
 148
 149#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 150#define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
 151#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
 152
 153#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 154static inline unsigned int create_ce_mode(unsigned int mode)
 155{
 156        if (S_ISLNK(mode))
 157                return S_IFLNK;
 158        if (S_ISDIR(mode) || S_ISGITLINK(mode))
 159                return S_IFGITLINK;
 160        return S_IFREG | ce_permissions(mode);
 161}
 162static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 163{
 164        extern int trust_executable_bit, has_symlinks;
 165        if (!has_symlinks && S_ISREG(mode) &&
 166            ce && S_ISLNK(ce->ce_mode))
 167                return ce->ce_mode;
 168        if (!trust_executable_bit && S_ISREG(mode)) {
 169                if (ce && S_ISREG(ce->ce_mode))
 170                        return ce->ce_mode;
 171                return create_ce_mode(0666);
 172        }
 173        return create_ce_mode(mode);
 174}
 175#define canon_mode(mode) \
 176        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 177        S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
 178
 179#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 180#define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
 181
 182struct index_state {
 183        struct cache_entry **cache;
 184        unsigned int cache_nr, cache_alloc, cache_changed;
 185        struct cache_tree *cache_tree;
 186        time_t timestamp;
 187        void *alloc;
 188};
 189
 190extern struct index_state the_index;
 191
 192#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
 193#define active_cache (the_index.cache)
 194#define active_nr (the_index.cache_nr)
 195#define active_alloc (the_index.cache_alloc)
 196#define active_cache_changed (the_index.cache_changed)
 197#define active_cache_tree (the_index.cache_tree)
 198
 199#define read_cache() read_index(&the_index)
 200#define read_cache_from(path) read_index_from(&the_index, (path))
 201#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
 202#define discard_cache() discard_index(&the_index)
 203#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
 204#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
 205#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
 206#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
 207#define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
 208#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
 209#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
 210#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
 211#endif
 212
 213enum object_type {
 214        OBJ_BAD = -1,
 215        OBJ_NONE = 0,
 216        OBJ_COMMIT = 1,
 217        OBJ_TREE = 2,
 218        OBJ_BLOB = 3,
 219        OBJ_TAG = 4,
 220        /* 5 for future expansion */
 221        OBJ_OFS_DELTA = 6,
 222        OBJ_REF_DELTA = 7,
 223        OBJ_MAX,
 224};
 225
 226static inline enum object_type object_type(unsigned int mode)
 227{
 228        return S_ISDIR(mode) ? OBJ_TREE :
 229                S_ISGITLINK(mode) ? OBJ_COMMIT :
 230                OBJ_BLOB;
 231}
 232
 233#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 234#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
 235#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 236#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 237#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 238#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 239#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 240#define CONFIG_ENVIRONMENT "GIT_CONFIG"
 241#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 242#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 243#define GITATTRIBUTES_FILE ".gitattributes"
 244#define INFOATTRIBUTES_FILE "info/attributes"
 245#define ATTRIBUTE_MACRO_PREFIX "[attr]"
 246
 247extern int is_bare_repository_cfg;
 248extern int is_bare_repository(void);
 249extern int is_inside_git_dir(void);
 250extern char *git_work_tree_cfg;
 251extern int is_inside_work_tree(void);
 252extern const char *get_git_dir(void);
 253extern char *get_object_directory(void);
 254extern char *get_refs_directory(void);
 255extern char *get_index_file(void);
 256extern char *get_graft_file(void);
 257extern int set_git_dir(const char *path);
 258extern const char *get_git_work_tree(void);
 259
 260#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 261
 262extern const char **get_pathspec(const char *prefix, const char **pathspec);
 263extern void setup_work_tree(void);
 264extern const char *setup_git_directory_gently(int *);
 265extern const char *setup_git_directory(void);
 266extern const char *prefix_path(const char *prefix, int len, const char *path);
 267extern const char *prefix_filename(const char *prefix, int len, const char *path);
 268extern void verify_filename(const char *prefix, const char *name);
 269extern void verify_non_filename(const char *prefix, const char *name);
 270
 271#define alloc_nr(x) (((x)+16)*3/2)
 272
 273/*
 274 * Realloc the buffer pointed at by variable 'x' so that it can hold
 275 * at least 'nr' entries; the number of entries currently allocated
 276 * is 'alloc', using the standard growing factor alloc_nr() macro.
 277 *
 278 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
 279 */
 280#define ALLOC_GROW(x, nr, alloc) \
 281        do { \
 282                if ((nr) > alloc) { \
 283                        if (alloc_nr(alloc) < (nr)) \
 284                                alloc = (nr); \
 285                        else \
 286                                alloc = alloc_nr(alloc); \
 287                        x = xrealloc((x), alloc * sizeof(*(x))); \
 288                } \
 289        } while(0)
 290
 291/* Initialize and use the cache information */
 292extern int read_index(struct index_state *);
 293extern int read_index_from(struct index_state *, const char *path);
 294extern int write_index(struct index_state *, int newfd);
 295extern int discard_index(struct index_state *);
 296extern int verify_path(const char *path);
 297extern int index_name_pos(struct index_state *, const char *name, int namelen);
 298#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 299#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 300#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 301#define ADD_CACHE_JUST_APPEND 8         /* Append only; tree.c::read_tree() */
 302extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
 303extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 304extern int remove_index_entry_at(struct index_state *, int pos);
 305extern int remove_file_from_index(struct index_state *, const char *path);
 306extern int add_file_to_index(struct index_state *, const char *path, int verbose);
 307extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
 308extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 309
 310/* do stat comparison even if CE_VALID is true */
 311#define CE_MATCH_IGNORE_VALID           01
 312/* do not check the contents but report dirty on racily-clean entries */
 313#define CE_MATCH_RACY_IS_DIRTY  02
 314extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 315extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
 316
 317extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 318extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 319extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 320extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 321extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 322
 323#define REFRESH_REALLY          0x0001  /* ignore_valid */
 324#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 325#define REFRESH_QUIET           0x0004  /* be quiet about it */
 326#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 327extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
 328
 329struct lock_file {
 330        struct lock_file *next;
 331        int fd;
 332        pid_t owner;
 333        char on_list;
 334        char filename[PATH_MAX];
 335};
 336extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 337extern int commit_lock_file(struct lock_file *);
 338
 339extern int hold_locked_index(struct lock_file *, int);
 340extern int commit_locked_index(struct lock_file *);
 341extern void set_alternate_index_output(const char *);
 342extern int close_lock_file(struct lock_file *);
 343extern void rollback_lock_file(struct lock_file *);
 344extern int delete_ref(const char *, const unsigned char *sha1);
 345
 346/* Environment bits from configuration mechanism */
 347extern int trust_executable_bit;
 348extern int quote_path_fully;
 349extern int has_symlinks;
 350extern int assume_unchanged;
 351extern int prefer_symlink_refs;
 352extern int log_all_ref_updates;
 353extern int warn_ambiguous_refs;
 354extern int shared_repository;
 355extern const char *apply_default_whitespace;
 356extern int zlib_compression_level;
 357extern int core_compression_level;
 358extern int core_compression_seen;
 359extern size_t packed_git_window_size;
 360extern size_t packed_git_limit;
 361extern size_t delta_base_cache_limit;
 362extern int auto_crlf;
 363
 364#define GIT_REPO_VERSION 0
 365extern int repository_format_version;
 366extern int check_repository_format(void);
 367
 368#define MTIME_CHANGED   0x0001
 369#define CTIME_CHANGED   0x0002
 370#define OWNER_CHANGED   0x0004
 371#define MODE_CHANGED    0x0008
 372#define INODE_CHANGED   0x0010
 373#define DATA_CHANGED    0x0020
 374#define TYPE_CHANGED    0x0040
 375
 376/* Return a statically allocated filename matching the sha1 signature */
 377extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 378extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 379extern char *sha1_file_name(const unsigned char *sha1);
 380extern char *sha1_pack_name(const unsigned char *sha1);
 381extern char *sha1_pack_index_name(const unsigned char *sha1);
 382extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 383extern const unsigned char null_sha1[20];
 384static inline int is_null_sha1(const unsigned char *sha1)
 385{
 386        return !memcmp(sha1, null_sha1, 20);
 387}
 388static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 389{
 390        return memcmp(sha1, sha2, 20);
 391}
 392static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 393{
 394        memcpy(sha_dst, sha_src, 20);
 395}
 396static inline void hashclr(unsigned char *hash)
 397{
 398        memset(hash, 0, 20);
 399}
 400
 401int git_mkstemp(char *path, size_t n, const char *template);
 402
 403enum sharedrepo {
 404        PERM_UMASK = 0,
 405        PERM_GROUP,
 406        PERM_EVERYBODY
 407};
 408int git_config_perm(const char *var, const char *value);
 409int adjust_shared_perm(const char *path);
 410int safe_create_leading_directories(char *path);
 411char *enter_repo(char *path, int strict);
 412static inline int is_absolute_path(const char *path)
 413{
 414        return path[0] == '/';
 415}
 416const char *make_absolute_path(const char *path);
 417
 418/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 419extern int sha1_object_info(const unsigned char *, unsigned long *);
 420extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 421extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 422extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 423extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 424
 425extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 426
 427extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 428                              size_t bufsize, size_t *bufposn);
 429extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 430extern int move_temp_to_file(const char *tmpfile, const char *filename);
 431
 432extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 433extern int has_sha1_file(const unsigned char *sha1);
 434
 435extern int has_pack_file(const unsigned char *sha1);
 436extern int has_pack_index(const unsigned char *sha1);
 437
 438extern const signed char hexval_table[256];
 439static inline unsigned int hexval(unsigned char c)
 440{
 441        return hexval_table[c];
 442}
 443
 444/* Convert to/from hex/sha1 representation */
 445#define MINIMUM_ABBREV 4
 446#define DEFAULT_ABBREV 7
 447
 448extern int get_sha1(const char *str, unsigned char *sha1);
 449extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
 450extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 451extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 452extern int read_ref(const char *filename, unsigned char *sha1);
 453extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 454extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 455extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 456
 457extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
 458extern const char *ref_rev_parse_rules[];
 459extern const char *ref_fetch_rules[];
 460
 461extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 462extern int validate_headref(const char *ref);
 463
 464extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 465extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 466
 467extern void *read_object_with_reference(const unsigned char *sha1,
 468                                        const char *required_type,
 469                                        unsigned long *size,
 470                                        unsigned char *sha1_ret);
 471
 472enum date_mode {
 473        DATE_NORMAL = 0,
 474        DATE_RELATIVE,
 475        DATE_SHORT,
 476        DATE_LOCAL,
 477        DATE_ISO8601,
 478        DATE_RFC2822
 479};
 480
 481const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 482int parse_date(const char *date, char *buf, int bufsize);
 483void datestamp(char *buf, int bufsize);
 484unsigned long approxidate(const char *);
 485enum date_mode parse_date_format(const char *format);
 486
 487#define IDENT_WARN_ON_NO_NAME  1
 488#define IDENT_ERROR_ON_NO_NAME 2
 489#define IDENT_NO_DATE          4
 490extern const char *git_author_info(int);
 491extern const char *git_committer_info(int);
 492extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 493extern const char *fmt_name(const char *name, const char *email);
 494
 495struct checkout {
 496        const char *base_dir;
 497        int base_dir_len;
 498        unsigned force:1,
 499                 quiet:1,
 500                 not_new:1,
 501                 refresh_cache:1;
 502};
 503
 504extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
 505extern int has_symlink_leading_path(const char *name, char *last_symlink);
 506
 507extern struct alternate_object_database {
 508        struct alternate_object_database *next;
 509        char *name;
 510        char base[FLEX_ARRAY]; /* more */
 511} *alt_odb_list;
 512extern void prepare_alt_odb(void);
 513
 514struct pack_window {
 515        struct pack_window *next;
 516        unsigned char *base;
 517        off_t offset;
 518        size_t len;
 519        unsigned int last_used;
 520        unsigned int inuse_cnt;
 521};
 522
 523extern struct packed_git {
 524        struct packed_git *next;
 525        struct pack_window *windows;
 526        off_t pack_size;
 527        const void *index_data;
 528        size_t index_size;
 529        uint32_t num_objects;
 530        int index_version;
 531        time_t mtime;
 532        int pack_fd;
 533        int pack_local;
 534        unsigned char sha1[20];
 535        /* something like ".git/objects/pack/xxxxx.pack" */
 536        char pack_name[FLEX_ARRAY]; /* more */
 537} *packed_git;
 538
 539struct pack_entry {
 540        off_t offset;
 541        unsigned char sha1[20];
 542        struct packed_git *p;
 543};
 544
 545struct ref {
 546        struct ref *next;
 547        unsigned char old_sha1[20];
 548        unsigned char new_sha1[20];
 549        unsigned int force:1,
 550                merge:1,
 551                nonfastforward:1,
 552                deletion:1;
 553        enum {
 554                REF_STATUS_NONE = 0,
 555                REF_STATUS_OK,
 556                REF_STATUS_REJECT_NONFASTFORWARD,
 557                REF_STATUS_REJECT_NODELETE,
 558                REF_STATUS_UPTODATE,
 559                REF_STATUS_REMOTE_REJECT,
 560                REF_STATUS_EXPECTING_REPORT,
 561        } status;
 562        char *remote_status;
 563        struct ref *peer_ref; /* when renaming */
 564        char name[FLEX_ARRAY]; /* more */
 565};
 566
 567#define REF_NORMAL      (1u << 0)
 568#define REF_HEADS       (1u << 1)
 569#define REF_TAGS        (1u << 2)
 570
 571extern struct ref *find_ref_by_name(struct ref *list, const char *name);
 572
 573#define CONNECT_VERBOSE       (1u << 0)
 574extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
 575extern int finish_connect(struct child_process *conn);
 576extern int path_match(const char *path, int nr, char **match);
 577extern int get_ack(int fd, unsigned char *result_sha1);
 578extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 579extern int server_supports(const char *feature);
 580
 581extern struct packed_git *parse_pack_index(unsigned char *sha1);
 582extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 583                                                const char *idx_path);
 584
 585extern void prepare_packed_git(void);
 586extern void reprepare_packed_git(void);
 587extern void install_packed_git(struct packed_git *pack);
 588
 589extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 590                                         struct packed_git *packs);
 591
 592extern void pack_report(void);
 593extern int open_pack_index(struct packed_git *);
 594extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 595extern void close_pack_windows(struct packed_git *);
 596extern void unuse_pack(struct pack_window **);
 597extern struct packed_git *add_packed_git(const char *, int, int);
 598extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
 599extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 600extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 601extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 602extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
 603extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 604extern int matches_pack_name(struct packed_git *p, const char *name);
 605
 606/* Dumb servers support */
 607extern int update_server_info(int);
 608
 609typedef int (*config_fn_t)(const char *, const char *);
 610extern int git_default_config(const char *, const char *);
 611extern int git_config_from_file(config_fn_t fn, const char *);
 612extern int git_config(config_fn_t fn);
 613extern int git_parse_long(const char *, long *);
 614extern int git_parse_ulong(const char *, unsigned long *);
 615extern int git_config_int(const char *, const char *);
 616extern unsigned long git_config_ulong(const char *, const char *);
 617extern int git_config_bool(const char *, const char *);
 618extern int git_config_set(const char *, const char *);
 619extern int git_config_set_multivar(const char *, const char *, const char *, int);
 620extern int git_config_rename_section(const char *, const char *);
 621extern const char *git_etc_gitconfig(void);
 622extern int check_repository_format_version(const char *var, const char *value);
 623
 624#define MAX_GITNAME (1000)
 625extern char git_default_email[MAX_GITNAME];
 626extern char git_default_name[MAX_GITNAME];
 627
 628extern const char *git_commit_encoding;
 629extern const char *git_log_output_encoding;
 630
 631/* IO helper functions */
 632extern void maybe_flush_or_die(FILE *, const char *);
 633extern int copy_fd(int ifd, int ofd);
 634extern int read_in_full(int fd, void *buf, size_t count);
 635extern int write_in_full(int fd, const void *buf, size_t count);
 636extern void write_or_die(int fd, const void *buf, size_t count);
 637extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 638extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 639
 640/* pager.c */
 641extern void setup_pager(void);
 642extern char *pager_program;
 643extern int pager_in_use(void);
 644extern int pager_use_color;
 645
 646extern char *editor_program;
 647extern char *excludes_file;
 648
 649/* base85 */
 650int decode_85(char *dst, const char *line, int linelen);
 651void encode_85(char *buf, const unsigned char *data, int bytes);
 652
 653/* alloc.c */
 654extern void *alloc_blob_node(void);
 655extern void *alloc_tree_node(void);
 656extern void *alloc_commit_node(void);
 657extern void *alloc_tag_node(void);
 658extern void *alloc_object_node(void);
 659extern void alloc_report(void);
 660
 661/* trace.c */
 662extern void trace_printf(const char *format, ...);
 663extern void trace_argv_printf(const char **argv, const char *format, ...);
 664
 665/* convert.c */
 666/* returns 1 if *dst was used */
 667extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
 668extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
 669
 670/* add */
 671void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
 672
 673/* diff.c */
 674extern int diff_auto_refresh_index;
 675
 676/* match-trees.c */
 677void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
 678
 679/*
 680 * whitespace rules.
 681 * used by both diff and apply
 682 */
 683#define WS_TRAILING_SPACE       01
 684#define WS_SPACE_BEFORE_TAB     02
 685#define WS_INDENT_WITH_NON_TAB  04
 686#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
 687extern unsigned whitespace_rule_cfg;
 688extern unsigned whitespace_rule(const char *);
 689extern unsigned parse_whitespace_rule(const char *);
 690extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
 691    FILE *stream, const char *set,
 692    const char *reset, const char *ws);
 693extern char *whitespace_error_string(unsigned ws);
 694
 695/* ls-files */
 696int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
 697int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
 698void overlay_tree_on_cache(const char *tree_name, const char *prefix);
 699
 700#endif /* CACHE_H */