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