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 #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
 115 extern struct cache_entry **active_cache;
 116 extern unsigned int active_nr, active_alloc, active_cache_changed;
 117 extern struct cache_tree *active_cache_tree;
 118 extern 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 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
 126 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
 127 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
 128 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
 129
 130 extern int is_bare_git_dir(const char *dir);
 131 extern const char *get_git_dir(void);
 132 extern char *get_object_directory(void);
 133 extern char *get_refs_directory(void);
 134 extern char *get_index_file(void);
 135 extern char *get_graft_file(void);
 136
 137 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
 138
 139 extern const char **get_pathspec(const char *prefix, const char **pathspec);
 140 extern const char *setup_git_directory_gently(int *);
 141 extern const char *setup_git_directory(void);
 142 extern const char *prefix_path(const char *prefix, int len, const char *path);
 143 extern const char *prefix_filename(const char *prefix, int len, const char *path);
 144 extern void verify_filename(const char *prefix, const char *name);
 145 extern void verify_non_filename(const char *prefix, const char *name);
 146
 147 #define alloc_nr(x) (((x)+16)*3/2)
 148
 149 /* Initialize and use the cache information */
 150 extern int read_cache(void);
 151 extern int read_cache_from(const char *path);
 152 extern int write_cache(int newfd, struct cache_entry **cache, int entries);
 153 extern int discard_cache(void);
 154 extern int verify_path(const char *path);
 155 extern int cache_name_pos(const char *name, int namelen);
 156 #define ADD_CACHE_OK_TO_ADD 1           /* Ok to add */
 157 #define ADD_CACHE_OK_TO_REPLACE 2       /* Ok to replace file/directory */
 158 #define ADD_CACHE_SKIP_DFCHECK 4        /* Ok to skip DF conflict checks */
 159 extern int add_cache_entry(struct cache_entry *ce, int option);
 160 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
 161 extern int remove_cache_entry_at(int pos);
 162 extern int remove_file_from_cache(const char *path);
 163 extern int add_file_to_index(const char *path, int verbose);
 164 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
 165 extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
 166 extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
 167 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
 168 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
 169 extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
 170 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
 171 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
 172 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
 173
 174 #define REFRESH_REALLY          0x0001  /* ignore_valid */
 175 #define REFRESH_UNMERGED        0x0002  /* allow unmerged */
 176 #define REFRESH_QUIET           0x0004  /* be quiet about it */
 177 #define REFRESH_IGNORE_MISSING  0x0008  /* ignore non-existent */
 178 extern int refresh_cache(unsigned int flags);
 179
 180 struct lock_file {
 181         struct lock_file *next;
 182         char filename[PATH_MAX];
 183 };
 184 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
 185 extern int commit_lock_file(struct lock_file *);
 186 extern void rollback_lock_file(struct lock_file *);
 187 extern int delete_ref(const char *, unsigned char *sha1);
 188
 189 /* Environment bits from configuration mechanism */
 190 extern int use_legacy_headers;
 191 extern int trust_executable_bit;
 192 extern int assume_unchanged;
 193 extern int prefer_symlink_refs;
 194 extern int log_all_ref_updates;
 195 extern int warn_ambiguous_refs;
 196 extern int shared_repository;
 197 extern const char *apply_default_whitespace;
 198 extern int zlib_compression_level;
 199
 200 #define GIT_REPO_VERSION 0
 201 extern int repository_format_version;
 202 extern int check_repository_format(void);
 203
 204 #define MTIME_CHANGED   0x0001
 205 #define CTIME_CHANGED   0x0002
 206 #define OWNER_CHANGED   0x0004
 207 #define MODE_CHANGED    0x0008
 208 #define INODE_CHANGED   0x0010
 209 #define DATA_CHANGED    0x0020
 210 #define TYPE_CHANGED    0x0040
 211
 212 /* Return a statically allocated filename matching the sha1 signature */
 213 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 214 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
 215 extern char *sha1_file_name(const unsigned char *sha1);
 216 extern char *sha1_pack_name(const unsigned char *sha1);
 217 extern char *sha1_pack_index_name(const unsigned char *sha1);
 218 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
 219 extern const unsigned char null_sha1[20];
 220 static inline int is_null_sha1(const unsigned char *sha1)
 221 {
 222         return !memcmp(sha1, null_sha1, 20);
 223 }
 224 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 225 {
 226         return memcmp(sha1, sha2, 20);
 227 }
 228 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 229 {
 230         memcpy(sha_dst, sha_src, 20);
 231 }
 232 static inline void hashclr(unsigned char *hash)
 233 {
 234         memset(hash, 0, 20);
 235 }
 236
 237 int git_mkstemp(char *path, size_t n, const char *template);
 238
 239 enum sharedrepo {
 240         PERM_UMASK = 0,
 241         PERM_GROUP,
 242         PERM_EVERYBODY
 243 };
 244 int git_config_perm(const char *var, const char *value);
 245 int adjust_shared_perm(const char *path);
 246 int safe_create_leading_directories(char *path);
 247 char *enter_repo(char *path, int strict);
 248
 249 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 250 extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
 251 extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
 252 extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 253 extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
 254 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
 255
 256 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
 257
 258 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
 259                               size_t bufsize, size_t *bufposn);
 260 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
 261 extern int move_temp_to_file(const char *tmpfile, const char *filename);
 262
 263 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
 264 extern int has_sha1_file(const unsigned char *sha1);
 265 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
 266 extern int legacy_loose_object(unsigned char *);
 267
 268 extern int has_pack_file(const unsigned char *sha1);
 269 extern int has_pack_index(const unsigned char *sha1);
 270
 271 enum object_type {
 272         OBJ_NONE = 0,
 273         OBJ_COMMIT = 1,
 274         OBJ_TREE = 2,
 275         OBJ_BLOB = 3,
 276         OBJ_TAG = 4,
 277         /* 5 for future expansion */
 278         OBJ_OFS_DELTA = 6,
 279         OBJ_REF_DELTA = 7,
 280         OBJ_BAD,
 281 };
 282
 283 extern signed char hexval_table[256];
 284 static inline unsigned int hexval(unsigned int c)
 285 {
 286         return hexval_table[c];
 287 }
 288
 289 /* Convert to/from hex/sha1 representation */
 290 #define MINIMUM_ABBREV 4
 291 #define DEFAULT_ABBREV 7
 292
 293 extern int get_sha1(const char *str, unsigned char *sha1);
 294 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
 295 extern char *sha1_to_hex(const unsigned char *sha1);    /* static buffer result! */
 296 extern int read_ref(const char *filename, unsigned char *sha1);
 297 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
 298 extern int create_symref(const char *ref, const char *refs_heads_master);
 299 extern int validate_symref(const char *ref);
 300
 301 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
 302 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
 303
 304 extern void *read_object_with_reference(const unsigned char *sha1,
 305                                         const char *required_type,
 306                                         unsigned long *size,
 307                                         unsigned char *sha1_ret);
 308
 309 const char *show_date(unsigned long time, int timezone, int relative);
 310 const char *show_rfc2822_date(unsigned long time, int timezone);
 311 int parse_date(const char *date, char *buf, int bufsize);
 312 void datestamp(char *buf, int bufsize);
 313 unsigned long approxidate(const char *);
 314
 315 extern int setup_ident(void);
 316 extern void ignore_missing_committer_name();
 317 extern const char *git_author_info(int);
 318 extern const char *git_committer_info(int);
 319
 320 struct checkout {
 321         const char *base_dir;
 322         int base_dir_len;
 323         unsigned force:1,
 324                  quiet:1,
 325                  not_new:1,
 326                  refresh_cache:1;
 327 };
 328
 329 extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
 330
 331 extern struct alternate_object_database {
 332         struct alternate_object_database *next;
 333         char *name;
 334         char base[FLEX_ARRAY]; /* more */
 335 } *alt_odb_list;
 336 extern void prepare_alt_odb(void);
 337
 338 extern struct packed_git {
 339         struct packed_git *next;
 340         unsigned long index_size;
 341         unsigned long pack_size;
 342         unsigned int *index_base;
 343         void *pack_base;
 344         unsigned int pack_last_used;
 345         unsigned int pack_use_cnt;
 346         int pack_local;
 347         unsigned char sha1[20];
 348         /* something like ".git/objects/pack/xxxxx.pack" */
 349         char pack_name[FLEX_ARRAY]; /* more */
 350 } *packed_git;
 351
 352 struct pack_entry {
 353         unsigned int offset;
 354         unsigned char sha1[20];
 355         struct packed_git *p;
 356 };
 357
 358 struct ref {
 359         struct ref *next;
 360         unsigned char old_sha1[20];
 361         unsigned char new_sha1[20];
 362         unsigned char force;
 363         struct ref *peer_ref; /* when renaming */
 364         char name[FLEX_ARRAY]; /* more */
 365 };
 366
 367 #define REF_NORMAL      (1u << 0)
 368 #define REF_HEADS       (1u << 1)
 369 #define REF_TAGS        (1u << 2)
 370
 371 extern pid_t git_connect(int fd[2], char *url, const char *prog);
 372 extern int finish_connect(pid_t pid);
 373 extern int path_match(const char *path, int nr, char **match);
 374 extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
 375                       int nr_refspec, char **refspec, int all);
 376 extern int get_ack(int fd, unsigned char *result_sha1);
 377 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
 378 extern int server_supports(const char *feature);
 379
 380 extern struct packed_git *parse_pack_index(unsigned char *sha1);
 381 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
 382                                                 char *idx_path);
 383
 384 extern void prepare_packed_git(void);
 385 extern void reprepare_packed_git(void);
 386 extern void install_packed_git(struct packed_git *pack);
 387
 388 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
 389                                          struct packed_git *packs);
 390
 391 extern int use_packed_git(struct packed_git *);
 392 extern void unuse_packed_git(struct packed_git *);
 393 extern struct packed_git *add_packed_git(char *, int, int);
 394 extern int num_packed_objects(const struct packed_git *p);
 395 extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
 396 extern unsigned long find_pack_entry_one(const unsigned char *, struct packed_git *);
 397 extern void *unpack_entry_gently(struct packed_git *, unsigned long, char *, unsigned long *);
 398 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
 399 extern void packed_object_info_detail(struct packed_git *, unsigned long, char *, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
 400
 401 /* Dumb servers support */
 402 extern int update_server_info(int);
 403
 404 typedef int (*config_fn_t)(const char *, const char *);
 405 extern int git_default_config(const char *, const char *);
 406 extern int git_config_from_file(config_fn_t fn, const char *);
 407 extern int git_config(config_fn_t fn);
 408 extern int git_config_int(const char *, const char *);
 409 extern int git_config_bool(const char *, const char *);
 410 extern int git_config_set(const char *, const char *);
 411 extern int git_config_set_multivar(const char *, const char *, const char *, int);
 412 extern int git_config_rename_section(const char *, const char *);
 413 extern int check_repository_format_version(const char *var, const char *value);
 414
 415 #define MAX_GITNAME (1000)
 416 extern char git_default_email[MAX_GITNAME];
 417 extern char git_default_name[MAX_GITNAME];
 418
 419 #define MAX_ENCODING_LENGTH 64
 420 extern char git_commit_encoding[MAX_ENCODING_LENGTH];
 421
 422 extern int copy_fd(int ifd, int ofd);
 423 extern void write_or_die(int fd, const void *buf, size_t count);
 424 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
 425
 426 /* pager.c */
 427 extern void setup_pager(void);
 428 extern int pager_in_use;
 429 extern int pager_use_color;
 430
 431 /* base85 */
 432 int decode_85(char *dst, char *line, int linelen);
 433 void encode_85(char *buf, unsigned char *data, int bytes);
 434
 435 /* alloc.c */
 436 struct blob;
 437 struct tree;
 438 struct commit;
 439 struct tag;
 440 extern struct blob *alloc_blob_node(void);
 441 extern struct tree *alloc_tree_node(void);
 442 extern struct commit *alloc_commit_node(void);
 443 extern struct tag *alloc_tag_node(void);
 444 extern void alloc_report(void);
 445
 446 /* trace.c */
 447 extern int nfvasprintf(char **str, const char *fmt, va_list va);
 448 extern void trace_printf(const char *format, ...);
 449 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
 450
 451 #endif /* CACHE_H */