Andrew's git - gitweb.git/blob

   1#ifndef CACHE_H
   2#define CACHE_H
   3
   4#include "git-compat-util.h"
   5
   6#include SHA1_HEADER
   7#include <zlib.h>
   8
   9#if ZLIB_VERNUM < 0x1200
  10#define deflateBound(c,s)  ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
  11#endif
  12
  13#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
  14#define DTYPE(de)       ((de)->d_type)
  15#else
  16#undef DT_UNKNOWN
  17#undef DT_DIR
  18#undef DT_REG
  19#undef DT_LNK
  20#define DT_UNKNOWN      0
  21#define DT_DIR          1
  22#define DT_REG          2
  23#define DT_LNK          3
  24#define DTYPE(de)       DT_UNKNOWN
  25#endif
  26
  27/*
  28 * Intensive research over the course of many years has shown that
  29 * port 9418 is totally unused by anything else. Or
  30 *
  31 *      Your search - "port 9418" - did not match any documents.
  32 *
  33 * as www.google.com puts it.
  34 *
  35 * This port has been properly assigned for git use by IANA:
  36 * git (Assigned-9418) [I06-050728-0001].
  37 *
  38 *      git  9418/tcp   git pack transfer service
  39 *      git  9418/udp   git pack transfer service
  40 *
  41 * with Linus Torvalds <torvalds@osdl.org> as the point of
  42 * contact. September 2005.
  43 *
  44 * See http://www.iana.org/assignments/port-numbers
  45 */
  46#define DEFAULT_GIT_PORT 9418
  47
  48/*
  49 * Basic data structures for the directory cache
  50 */
  51
  52#define CACHE_SIGNATURE 0x44495243      /* "DIRC" */
  53struct cache_header {
  54        unsigned int hdr_signature;
  55        unsigned int hdr_version;
  56        unsigned int hdr_entries;
  57};
  58
  59/*
  60 * The "cache_time" is just the low 32 bits of the
  61 * time. It doesn't matter if it overflows - we only
  62 * check it for equality in the 32 bits we save.
  63 */
  64struct cache_time {
  65        unsigned int sec;
  66        unsigned int nsec;
  67};
  68
  69/*
  70 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
  71 * Again - this is just a (very strong in practice) heuristic that
  72 * the inode hasn't changed.
  73 *
  74 * We save the fields in big-endian order to allow using the
  75 * index file over NFS transparently.
  76 */
  77struct cache_entry {
  78        struct cache_time ce_ctime;
  79        struct cache_time ce_mtime;
  80        unsigned int ce_dev;
  81        unsigned int ce_ino;
  82        unsigned int ce_mode;
  83        unsigned int ce_uid;
  84        unsigned int ce_gid;
  85        unsigned int ce_size;
  86        unsigned char sha1[20];
  87        unsigned short ce_flags;
  88        char name[FLEX_ARRAY]; /* more */
  89};
  90
  91#define CE_NAMEMASK  (0x0fff)
  92#define CE_STAGEMASK (0x3000)
  93#define CE_UPDATE    (0x4000)
  94#define CE_VALID     (0x8000)
  95#define CE_STAGESHIFT 12
  96
  97#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
  98#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
  99#define ce_size(ce) cache_entry_size(ce_namelen(ce))
 100#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
 101
 102#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
 103static inline unsigned int create_ce_mode(unsigned int mode)
 104{
 105        if (S_ISLNK(mode))
 106                return htonl(S_IFLNK);
 107        return htonl(S_IFREG | ce_permissions(mode));
 108}
 109#define canon_mode(mode) \
 110        (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 111        S_ISLNK(mode) ? S_IFLNK : S_IFDIR)
 112
 113#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 114
 115extern struct cache_entry **active_cache;
 116extern unsigned int active_nr, active_alloc, active_cache_changed;
 117extern struct cache_tree *active_cache_tree;
 118extern int cache_errno;
 119
 120#define GIT_DIR_ENVIRONMENT "GIT_DIR"
 121#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 122#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 123#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 124#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 125
 126extern const char *get_git_dir(void);
 127extern char *get_object_directory(void);
 128extern char *get_refs_directory(void);
 129extern char *get_index_file(void);
 130extern char *get_graft_file(void);
 131
 132#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 133
 134extern const char **get_pathspec(const char *prefix, const char **pathspec);
 135extern const char *setup_git_directory_gently(int *);
 136extern const char *setup_git_directory(void);
 137extern const char *prefix_path(const char *prefix, int len, const char *path);
 138extern const char *prefix_filename(const char *prefix, int len, const char *path);
 139extern void verify_filename(const char *prefix, const char *name);
 140extern void verify_non_filename(const char *prefix, const char *name);
 141
 142#define alloc_nr(x) (((x)+16)*3/2)
 143
 144/* Initialize and use the cache information */
 145extern int read_cache(void);
 146extern int read_cache_from(const char *path);
 147extern int write_cache(int newfd, struct cache_entry **cache, int entries);
 148extern int discard_cache(void);
 149extern int verify_path(const char *path);
 150extern int cache_name_pos(const char *name, int namelen);
 151#define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 152#define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 153#define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 154extern int add_cache_entry(struct cache_entry *ce, int option);
 155extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 156extern int remove_cache_entry_at(int pos);
 157extern int remove_file_from_cache(const char *path);
 158extern int add_file_to_index(const char *path, int verbose);
 159extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 160extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
 161extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
 162extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 163extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
 164extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 165extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 166extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 167extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 168
 169#define REFRESH_REALLY          0x0001  /* ignore_valid */
 170#define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 171#define REFRESH_QUIET           0x0004  /* be quiet about it */
 172#define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 173extern int refresh_cache(unsigned int flags);
 174
 175struct lock_file {
 176        struct lock_file *next;
 177        char filename[PATH_MAX];
 178};
 179extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 180extern int commit_lock_file(struct lock_file *);
 181extern void rollback_lock_file(struct lock_file *);
 182
 183/* Environment bits from configuration mechanism */
 184extern int use_legacy_headers;
 185extern int trust_executable_bit;
 186extern int assume_unchanged;
 187extern int prefer_symlink_refs;
 188extern int log_all_ref_updates;
 189extern int warn_ambiguous_refs;
 190extern int shared_repository;
 191extern int deny_non_fast_forwards;
 192extern const char *apply_default_whitespace;
 193extern int zlib_compression_level;
 194
 195#define GIT_REPO_VERSION 0
 196extern int repository_format_version;
 197extern int check_repository_format(void);
 198
 199#define MTIME_CHANGED   0x0001
 200#define CTIME_CHANGED   0x0002
 201#define OWNER_CHANGED   0x0004
 202#define MODE_CHANGED    0x0008
 203#define INODE_CHANGED   0x0010
 204#define DATA_CHANGED    0x0020
 205#define TYPE_CHANGED    0x0040
 206
 207/* Return a statically allocated filename matching the sha1 signature */
 208extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 209extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 210extern char *sha1_file_name(const unsigned char *sha1);
 211extern char *sha1_pack_name(const unsigned char *sha1);
 212extern char *sha1_pack_index_name(const unsigned char *sha1);
 213extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 214extern const unsigned char null_sha1[20];
 215static inline int is_null_sha1(const unsigned char *sha1)
 216{
 217        return !memcmp(sha1, null_sha1, 20);
 218}
 219static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 220{
 221        return memcmp(sha1, sha2, 20);
 222}
 223static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 224{
 225        memcpy(sha_dst, sha_src, 20);
 226}
 227static inline void hashclr(unsigned char *hash)
 228{
 229        memset(hash, 0, 20);
 230}
 231
 232int git_mkstemp(char *path, size_t n, const char *template);
 233
 234enum sharedrepo {
 235        PERM_UMASK = 0,
 236        PERM_GROUP,
 237        PERM_EVERYBODY
 238};
 239int git_config_perm(const char *var, const char *value);
 240int adjust_shared_perm(const char *path);
 241int safe_create_leading_directories(char *path);
 242char *enter_repo(char *path, int strict);
 243
 244/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 245extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
 246extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
 247extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 248extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 249extern char *write_sha1_file_prepare(void *buf,
 250                                     unsigned long len,
 251                                     const char *type,
 252                                     unsigned char *sha1,
 253                                     unsigned char *hdr,
 254                                     int *hdrlen);
 255
 256extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 257
 258extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 259                              size_t bufsize, size_t *bufposn);
 260extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 261extern int move_temp_to_file(const char *tmpfile, const char *filename);
 262
 263extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 264extern int has_sha1_file(const unsigned char *sha1);
 265extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
 266extern int legacy_loose_object(unsigned char *);
 267
 268extern int has_pack_file(const unsigned char *sha1);
 269extern int has_pack_index(const unsigned char *sha1);
 270
 271enum object_type {
 272        OBJ_NONE = 0,
 273        OBJ_COMMIT = 1,
 274        OBJ_TREE = 2,
 275        OBJ_BLOB = 3,
 276        OBJ_TAG = 4,
 277        /* 5/6 for future expansion */
 278        OBJ_DELTA = 7,
 279        OBJ_BAD,
 280};
 281
 282extern signed char hexval_table[256];
 283static inline unsigned int hexval(unsigned int c)
 284{
 285        return hexval_table[c];
 286}
 287
 288/* Convert to/from hex/sha1 representation */
 289#define MINIMUM_ABBREV 4
 290#define DEFAULT_ABBREV 7
 291
 292extern int get_sha1(const char *str, unsigned char *sha1);
 293extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 294extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 295extern int read_ref(const char *filename, unsigned char *sha1);
 296extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
 297extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
 298extern int validate_symref(const char *git_HEAD);
 299
 300extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 301extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 302
 303extern void *read_object_with_reference(const unsigned char *sha1,
 304                                        const char *required_type,
 305                                        unsigned long *size,
 306                                        unsigned char *sha1_ret);
 307
 308const char *show_date(unsigned long time, int timezone, int relative);
 309const char *show_rfc2822_date(unsigned long time, int timezone);
 310int parse_date(const char *date, char *buf, int bufsize);
 311void datestamp(char *buf, int bufsize);
 312unsigned long approxidate(const char *);
 313
 314extern int setup_ident(void);
 315extern const char *git_author_info(int);
 316extern const char *git_committer_info(int);
 317
 318struct checkout {
 319        const char *base_dir;
 320        int base_dir_len;
 321        unsigned force:1,
 322                 quiet:1,
 323                 not_new:1,
 324                 refresh_cache:1;
 325};
 326
 327extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
 328
 329extern struct alternate_object_database {
 330        struct alternate_object_database *next;
 331        char *name;
 332        char base[FLEX_ARRAY]; /* more */
 333} *alt_odb_list;
 334extern void prepare_alt_odb(void);
 335
 336extern struct packed_git {
 337        struct packed_git *next;
 338        unsigned long index_size;
 339        unsigned long pack_size;
 340        unsigned int *index_base;
 341        void *pack_base;
 342        unsigned int pack_last_used;
 343        unsigned int pack_use_cnt;
 344        int pack_local;
 345        unsigned char sha1[20];
 346        /* something like ".git/objects/pack/xxxxx.pack" */
 347        char pack_name[FLEX_ARRAY]; /* more */
 348} *packed_git;
 349
 350struct pack_entry {
 351        unsigned int offset;
 352        unsigned char sha1[20];
 353        struct packed_git *p;
 354};
 355
 356struct ref {
 357        struct ref *next;
 358        unsigned char old_sha1[20];
 359        unsigned char new_sha1[20];
 360        unsigned char force;
 361        struct ref *peer_ref; /* when renaming */
 362        char name[FLEX_ARRAY]; /* more */
 363};
 364
 365#define REF_NORMAL      (1u << 0)
 366#define REF_HEADS       (1u << 1)
 367#define REF_TAGS        (1u << 2)
 368
 369extern pid_t git_connect(int fd[2], char *url, const char *prog);
 370extern int finish_connect(pid_t pid);
 371extern int path_match(const char *path, int nr, char **match);
 372extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 373                      int nr_refspec, char **refspec, int all);
 374extern int get_ack(int fd, unsigned char *result_sha1);
 375extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 376extern int server_supports(const char *feature);
 377
 378extern struct packed_git *parse_pack_index(unsigned char *sha1);
 379extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 380                                                char *idx_path);
 381
 382extern void prepare_packed_git(void);
 383extern void install_packed_git(struct packed_git *pack);
 384
 385extern struct packed_git *find_sha1_pack(const unsigned char *sha1, 
 386                                         struct packed_git *packs);
 387
 388extern int use_packed_git(struct packed_git *);
 389extern void unuse_packed_git(struct packed_git *);
 390extern struct packed_git *add_packed_git(char *, int, int);
 391extern int num_packed_objects(const struct packed_git *p);
 392extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
 393extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
 394extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
 395extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 396extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 397
 398/* Dumb servers support */
 399extern int update_server_info(int);
 400
 401typedef int (*config_fn_t)(const char *, const char *);
 402extern int git_default_config(const char *, const char *);
 403extern int git_config_from_file(config_fn_t fn, const char *);
 404extern int git_config(config_fn_t fn);
 405extern int git_config_int(const char *, const char *);
 406extern int git_config_bool(const char *, const char *);
 407extern int git_config_set(const char *, const char *);
 408extern int git_config_set_multivar(const char *, const char *, const char *, int);
 409extern int check_repository_format_version(const char *var, const char *value);
 410
 411#define MAX_GITNAME (1000)
 412extern char git_default_email[MAX_GITNAME];
 413extern char git_default_name[MAX_GITNAME];
 414
 415#define MAX_ENCODING_LENGTH 64
 416extern char git_commit_encoding[MAX_ENCODING_LENGTH];
 417
 418extern int copy_fd(int ifd, int ofd);
 419extern void write_or_die(int fd, const void *buf, size_t count);
 420extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 421
 422/* Finish off pack transfer receiving end */
 423extern int receive_unpack_pack(int fd[2], const char *me, int quiet, int);
 424extern int receive_keep_pack(int fd[2], const char *me, int quiet, int);
 425
 426/* pager.c */
 427extern void setup_pager(void);
 428extern int pager_in_use;
 429extern int pager_use_color;
 430
 431/* base85 */
 432int decode_85(char *dst, char *line, int linelen);
 433void encode_85(char *buf, unsigned char *data, int bytes);
 434
 435/* alloc.c */
 436struct blob;
 437struct tree;
 438struct commit;
 439struct tag;
 440extern struct blob *alloc_blob_node(void);
 441extern struct tree *alloc_tree_node(void);
 442extern struct commit *alloc_commit_node(void);
 443extern struct tag *alloc_tag_node(void);
 444extern void alloc_report(void);
 445
 446/* trace.c */
 447extern int nfvasprintf(char **str, const char *fmt, va_list va);
 448extern void trace_printf(const char *format, ...);
 449extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 450
 451#endif /* CACHE_H */