cache.h

   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" */
  53 struct 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  */
  64 struct 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  */
  77 struct 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)
 103 static 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 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
 110 {
 111         extern int trust_executable_bit, has_symlinks;
 112         if (!has_symlinks && S_ISREG(mode) &&
 113             ce && S_ISLNK(ntohl(ce->ce_mode)))
 114                 return ce->ce_mode;
 115         if (!trust_executable_bit && S_ISREG(mode)) {
 116                 if (ce && S_ISREG(ntohl(ce->ce_mode)))
 117                         return ce->ce_mode;
 118                 return create_ce_mode(0666);
 119         }
 120         return create_ce_mode(mode);
 121 }
 122 #define canon_mode(mode) \
 123         (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
 124         S_ISLNK(mode) ? S_IFLNK : S_IFDIR)
 125
 126 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
 127
 128 extern struct cache_entry **active_cache;
 129 extern unsigned int active_nr, active_alloc, active_cache_changed;
 130 extern struct cache_tree *active_cache_tree;
 131 extern int cache_errno;
 132
 133 enum object_type {
 134         OBJ_BAD = -1,
 135         OBJ_NONE = 0,
 136         OBJ_COMMIT = 1,
 137         OBJ_TREE = 2,
 138         OBJ_BLOB = 3,
 139         OBJ_TAG = 4,
 140         /* 5 for future expansion */
 141         OBJ_OFS_DELTA = 6,
 142         OBJ_REF_DELTA = 7,
 143         OBJ_MAX,
 144 };
 145
 146 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
 147 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
 148 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
 149 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
 150 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
 151 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 152 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 153 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 154 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 155
 156 extern int is_bare_repository_cfg;
 157 extern int is_bare_repository(void);
 158 extern int is_inside_git_dir(void);
 159 extern const char *get_git_dir(void);
 160 extern char *get_object_directory(void);
 161 extern char *get_refs_directory(void);
 162 extern char *get_index_file(void);
 163 extern char *get_graft_file(void);
 164
 165 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 166
 167 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 168 extern const char *setup_git_directory_gently(int *);
 169 extern const char *setup_git_directory(void);
 170 extern const char *prefix_path(const char *prefix, int len, const char *path);
 171 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 172 extern void verify_filename(const char *prefix, const char *name);
 173 extern void verify_non_filename(const char *prefix, const char *name);
 174
 175 #define alloc_nr(x) (((x)+16)*3/2)
 176
 177 /* Initialize and use the cache information */
 178 extern int read_cache(void);
 179 extern int read_cache_from(const char *path);
 180 extern int write_cache(int newfd, struct cache_entry **cache, int entries);
 181 extern int discard_cache(void);
 182 extern int verify_path(const char *path);
 183 extern int cache_name_pos(const char *name, int namelen);
 184 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 185 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 186 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 187 extern int add_cache_entry(struct cache_entry *ce, int option);
 188 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 189 extern int remove_cache_entry_at(int pos);
 190 extern int remove_file_from_cache(const char *path);
 191 extern int add_file_to_index(const char *path, int verbose);
 192 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 193 extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
 194 extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
 195 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 196 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
 197 extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 198 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 199 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 200 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 201
 202 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 203 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 204 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 205 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 206 extern int refresh_cache(unsigned int flags);
 207
 208 struct lock_file {
 209         struct lock_file *next;
 210         char on_list;
 211         char filename[PATH_MAX];
 212 };
 213 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 214 extern int commit_lock_file(struct lock_file *);
 215 extern void rollback_lock_file(struct lock_file *);
 216 extern int delete_ref(const char *, unsigned char *sha1);
 217
 218 /* Environment bits from configuration mechanism */
 219 extern int use_legacy_headers;
 220 extern int trust_executable_bit;
 221 extern int has_symlinks;
 222 extern int assume_unchanged;
 223 extern int prefer_symlink_refs;
 224 extern int log_all_ref_updates;
 225 extern int warn_ambiguous_refs;
 226 extern int shared_repository;
 227 extern const char *apply_default_whitespace;
 228 extern int zlib_compression_level;
 229 extern size_t packed_git_window_size;
 230 extern size_t packed_git_limit;
 231 extern size_t delta_base_cache_limit;
 232 extern int auto_crlf;
 233
 234 #define GIT_REPO_VERSION 0
 235 extern int repository_format_version;
 236 extern int check_repository_format(void);
 237
 238 #define MTIME_CHANGED   0x0001
 239 #define CTIME_CHANGED   0x0002
 240 #define OWNER_CHANGED   0x0004
 241 #define MODE_CHANGED    0x0008
 242 #define INODE_CHANGED   0x0010
 243 #define DATA_CHANGED    0x0020
 244 #define TYPE_CHANGED    0x0040
 245
 246 /* Return a statically allocated filename matching the sha1 signature */
 247 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 248 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 249 extern char *sha1_file_name(const unsigned char *sha1);
 250 extern char *sha1_pack_name(const unsigned char *sha1);
 251 extern char *sha1_pack_index_name(const unsigned char *sha1);
 252 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 253 extern const unsigned char null_sha1[20];
 254 static inline int is_null_sha1(const unsigned char *sha1)
 255 {
 256         return !memcmp(sha1, null_sha1, 20);
 257 }
 258 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 259 {
 260         return memcmp(sha1, sha2, 20);
 261 }
 262 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 263 {
 264         memcpy(sha_dst, sha_src, 20);
 265 }
 266 static inline void hashclr(unsigned char *hash)
 267 {
 268         memset(hash, 0, 20);
 269 }
 270
 271 int git_mkstemp(char *path, size_t n, const char *template);
 272
 273 enum sharedrepo {
 274         PERM_UMASK = 0,
 275         PERM_GROUP,
 276         PERM_EVERYBODY
 277 };
 278 int git_config_perm(const char *var, const char *value);
 279 int adjust_shared_perm(const char *path);
 280 int safe_create_leading_directories(char *path);
 281 char *enter_repo(char *path, int strict);
 282
 283 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 284 extern int sha1_object_info(const unsigned char *, unsigned long *);
 285 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
 286 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
 287 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 288 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
 289
 290 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 291
 292 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 293                               size_t bufsize, size_t *bufposn);
 294 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 295 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 296
 297 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 298 extern int has_sha1_file(const unsigned char *sha1);
 299 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
 300 extern int legacy_loose_object(unsigned char *);
 301
 302 extern int has_pack_file(const unsigned char *sha1);
 303 extern int has_pack_index(const unsigned char *sha1);
 304
 305 extern signed char hexval_table[256];
 306 static inline unsigned int hexval(unsigned int c)
 307 {
 308         return hexval_table[c];
 309 }
 310
 311 /* Convert to/from hex/sha1 representation */
 312 #define MINIMUM_ABBREV 4
 313 #define DEFAULT_ABBREV 7
 314
 315 extern int get_sha1(const char *str, unsigned char *sha1);
 316 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 317 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 318 extern int read_ref(const char *filename, unsigned char *sha1);
 319 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 320 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
 321 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
 322
 323 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
 324 extern int validate_headref(const char *ref);
 325
 326 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 327 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 328
 329 extern void *read_object_with_reference(const unsigned char *sha1,
 330                                         const char *required_type,
 331                                         unsigned long *size,
 332                                         unsigned char *sha1_ret);
 333
 334 enum date_mode { DATE_NORMAL = 0, DATE_RELATIVE, DATE_SHORT };
 335 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
 336 const char *show_rfc2822_date(unsigned long time, int timezone);
 337 int parse_date(const char *date, char *buf, int bufsize);
 338 void datestamp(char *buf, int bufsize);
 339 unsigned long approxidate(const char *);
 340
 341 extern const char *git_author_info(int);
 342 extern const char *git_committer_info(int);
 343 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
 344
 345 struct checkout {
 346         const char *base_dir;
 347         int base_dir_len;
 348         unsigned force:1,
 349                  quiet:1,
 350                  not_new:1,
 351                  refresh_cache:1;
 352 };
 353
 354 extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
 355
 356 extern struct alternate_object_database {
 357         struct alternate_object_database *next;
 358         char *name;
 359         char base[FLEX_ARRAY]; /* more */
 360 } *alt_odb_list;
 361 extern void prepare_alt_odb(void);
 362
 363 struct pack_window {
 364         struct pack_window *next;
 365         unsigned char *base;
 366         off_t offset;
 367         size_t len;
 368         unsigned int last_used;
 369         unsigned int inuse_cnt;
 370 };
 371
 372 extern struct packed_git {
 373         struct packed_git *next;
 374         struct pack_window *windows;
 375         const void *index_data;
 376         off_t index_size;
 377         off_t pack_size;
 378         time_t mtime;
 379         int index_version;
 380         int pack_fd;
 381         int pack_local;
 382         unsigned char sha1[20];
 383         /* something like ".git/objects/pack/xxxxx.pack" */
 384         char pack_name[FLEX_ARRAY]; /* more */
 385 } *packed_git;
 386
 387 struct pack_entry {
 388         off_t offset;
 389         unsigned char sha1[20];
 390         struct packed_git *p;
 391 };
 392
 393 struct ref {
 394         struct ref *next;
 395         unsigned char old_sha1[20];
 396         unsigned char new_sha1[20];
 397         unsigned char force;
 398         struct ref *peer_ref; /* when renaming */
 399         char name[FLEX_ARRAY]; /* more */
 400 };
 401
 402 #define REF_NORMAL      (1u << 0)
 403 #define REF_HEADS       (1u << 1)
 404 #define REF_TAGS        (1u << 2)
 405
 406 extern pid_t git_connect(int fd[2], char *url, const char *prog);
 407 extern int finish_connect(pid_t pid);
 408 extern int path_match(const char *path, int nr, char **match);
 409 extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 410                       int nr_refspec, char **refspec, int all);
 411 extern int get_ack(int fd, unsigned char *result_sha1);
 412 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 413 extern int server_supports(const char *feature);
 414
 415 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 416 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 417                                                 const char *idx_path);
 418
 419 extern void prepare_packed_git(void);
 420 extern void reprepare_packed_git(void);
 421 extern void install_packed_git(struct packed_git *pack);
 422
 423 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 424                                          struct packed_git *packs);
 425
 426 extern void pack_report(void);
 427 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
 428 extern void unuse_pack(struct pack_window **);
 429 extern struct packed_git *add_packed_git(const char *, int, int);
 430 extern uint32_t num_packed_objects(const struct packed_git *p);
 431 extern int nth_packed_object_sha1(const struct packed_git *, uint32_t, unsigned char*);
 432 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
 433 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
 434 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 435 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 436
 437 /* Dumb servers support */
 438 extern int update_server_info(int);
 439
 440 typedef int (*config_fn_t)(const char *, const char *);
 441 extern int git_default_config(const char *, const char *);
 442 extern int git_config_from_file(config_fn_t fn, const char *);
 443 extern int git_config(config_fn_t fn);
 444 extern int git_config_int(const char *, const char *);
 445 extern int git_config_bool(const char *, const char *);
 446 extern int git_config_set(const char *, const char *);
 447 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 448 extern int git_config_rename_section(const char *, const char *);
 449 extern int check_repository_format_version(const char *var, const char *value);
 450
 451 #define MAX_GITNAME (1000)
 452 extern char git_default_email[MAX_GITNAME];
 453 extern char git_default_name[MAX_GITNAME];
 454
 455 extern const char *git_commit_encoding;
 456 extern const char *git_log_output_encoding;
 457
 458 extern int copy_fd(int ifd, int ofd);
 459 extern int read_in_full(int fd, void *buf, size_t count);
 460 extern int write_in_full(int fd, const void *buf, size_t count);
 461 extern void write_or_die(int fd, const void *buf, size_t count);
 462 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 463 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
 464
 465 /* pager.c */
 466 extern void setup_pager(void);
 467 extern int pager_in_use;
 468 extern int pager_use_color;
 469
 470 /* base85 */
 471 int decode_85(char *dst, const char *line, int linelen);
 472 void encode_85(char *buf, const unsigned char *data, int bytes);
 473
 474 /* alloc.c */
 475 struct blob;
 476 struct tree;
 477 struct commit;
 478 struct tag;
 479 extern struct blob *alloc_blob_node(void);
 480 extern struct tree *alloc_tree_node(void);
 481 extern struct commit *alloc_commit_node(void);
 482 extern struct tag *alloc_tag_node(void);
 483 extern void alloc_report(void);
 484
 485 /* trace.c */
 486 extern int nfasprintf(char **str, const char *fmt, ...);
 487 extern int nfvasprintf(char **str, const char *fmt, va_list va);
 488 extern void trace_printf(const char *format, ...);
 489 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 490
 491 /* convert.c */
 492 extern int convert_to_git(const char *path, char **bufp, unsigned long *sizep);
 493 extern int convert_to_working_tree(const char *path, char **bufp, unsigned long *sizep);
 494
 495 #endif /* CACHE_H */