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Introduce new config option for mmap limit.
[thirdparty/git.git] / cache.h
CommitLineData
e83c5163
LT		 1#ifndef CACHE_H
2#define CACHE_H
3
4050c0df 4#include "git-compat-util.h"
e83c5163 5
cef661fc 6#include SHA1_HEADER
e83c5163
LT		 7#include <zlib.h>
8
9da3acfb
ET		 9#if ZLIB_VERNUM < 0x1200
10#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
11#endif
12
962554c6 13#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
b6829693
ET		 14#define DTYPE(de) ((de)->d_type)
15#else
0bdd79af
JH		 16#undef DT_UNKNOWN
17#undef DT_DIR
18#undef DT_REG
19#undef DT_LNK
b6829693
ET		 20#define DT_UNKNOWN 0
21#define DT_DIR 1
22#define DT_REG 2
a15c1c60 23#define DT_LNK 3
b6829693
ET		 24#define DTYPE(de) DT_UNKNOWN
25#endif
26
2386d658
LT		 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.
ba8a4970
LT		 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
2386d658
LT		 45 */
46#define DEFAULT_GIT_PORT 9418
47
e83c5163
LT		 48/*
49 * Basic data structures for the directory cache
e83c5163
LT		 50 */
51
52#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
53struct cache_header {
ccc4feb5
LT		 54 unsigned int hdr_signature;
55 unsigned int hdr_version;
56 unsigned int hdr_entries;
e83c5163
LT		 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.
ccc4feb5
LT		 73 *
74 * We save the fields in big-endian order to allow using the
75 * index file over NFS transparently.
e83c5163
LT		 76 */
77struct cache_entry {
ccc4feb5
LT		 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;
e83c5163 86 unsigned char sha1[20];
f5cabd13 87 unsigned short ce_flags;
8f1d2e6f 88 char name[FLEX_ARRAY]; /* more */
e83c5163
LT		 89};
90
95fd5bf8
LT		 91#define CE_NAMEMASK (0x0fff)
92#define CE_STAGEMASK (0x3000)
220a0b52 93#define CE_UPDATE (0x4000)
5f73076c 94#define CE_VALID (0x8000)
aee46198 95#define CE_STAGESHIFT 12
95fd5bf8 96
aee46198
JH		 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
e4479470 102#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
8ae0a8c5
KS		 103static inline unsigned int create_ce_mode(unsigned int mode)
104{
8ae0a8c5
KS		 105 if (S_ISLNK(mode))
106 return htonl(S_IFLNK);
db823d4a 107 return htonl(S_IFREG | ce_permissions(mode));
8ae0a8c5 108}
1b0c7174
JH		 109#define canon_mode(mode) \
110 (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
111 S_ISLNK(mode) ? S_IFLNK : S_IFDIR)
e4479470 112
aee46198 113#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
f5cabd13 114
88355048
PB		 115extern struct cache_entry **active_cache;
116extern unsigned int active_nr, active_alloc, active_cache_changed;
bad68ec9 117extern struct cache_tree *active_cache_tree;
8fd2cb40 118extern int cache_errno;
e83c5163 119
8ac069ac
JH		 120#define GIT_DIR_ENVIRONMENT "GIT_DIR"
121#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
d19938ab 122#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
bb233d69 123#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
5da5c8f4 124#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
d4ebc36c
JH		 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"
bb233d69 129
0bee5918 130extern int is_bare_git_dir(const char *dir);
c5fba16c 131extern const char *get_git_dir(void);
8ac069ac 132extern char *get_object_directory(void);
95fc7512 133extern char *get_refs_directory(void);
8ac069ac 134extern char *get_index_file(void);
5da5c8f4 135extern char *get_graft_file(void);
8ac069ac
JH		 136
137#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
bb233d69 138
6b5ee137 139extern const char **get_pathspec(const char *prefix, const char **pathspec);
4ca06608 140extern const char *setup_git_directory_gently(int *);
d288a700 141extern const char *setup_git_directory(void);
6b5ee137 142extern const char *prefix_path(const char *prefix, int len, const char *path);
4ca06608 143extern const char *prefix_filename(const char *prefix, int len, const char *path);
e23d0b4a 144extern void verify_filename(const char *prefix, const char *name);
ea92f41f 145extern void verify_non_filename(const char *prefix, const char *name);
d288a700 146
e83c5163
LT		 147#define alloc_nr(x) (((x)+16)*3/2)
148
734aab75 149/* Initialize and use the cache information */
e83c5163 150extern int read_cache(void);
8fd2cb40 151extern int read_cache_from(const char *path);
197ee8c9 152extern int write_cache(int newfd, struct cache_entry **cache, int entries);
6d297f81 153extern int discard_cache(void);
8dcf39c4 154extern int verify_path(const char *path);
eb38c22f 155extern int cache_name_pos(const char *name, int namelen);
192268c1
JH		 156#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
157#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
b155725d 158#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
192268c1 159extern int add_cache_entry(struct cache_entry *ce, int option);
8fd2cb40 160extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
dbbce55b 161extern int remove_cache_entry_at(int pos);
6b5ee137 162extern int remove_file_from_cache(const char *path);
11be42a4 163extern int add_file_to_index(const char *path, int verbose);
dbbce55b 164extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
5f73076c
JH		 165extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
166extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
c0fd1f51 167extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
7672db20 168extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
e7332f96 169extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
024510c8 170extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
ec1fcc16 171extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
415e96c8
JH		 172extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
173
405e5b2f
LT		 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 */
178extern int refresh_cache(unsigned int flags);
179
021b6e45
JH		 180struct lock_file {
181 struct lock_file *next;
182 char filename[PATH_MAX];
415e96c8 183};
40aaae88 184extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
021b6e45
JH		 185extern int commit_lock_file(struct lock_file *);
186extern void rollback_lock_file(struct lock_file *);
ac5409e4 187extern int delete_ref(const char *, unsigned char *sha1);
734aab75 188
2ae1c53b 189/* Environment bits from configuration mechanism */
93821bd9 190extern int use_legacy_headers;
17712991 191extern int trust_executable_bit;
5f73076c 192extern int assume_unchanged;
9f0bb90d 193extern int prefer_symlink_refs;
6de08ae6 194extern int log_all_ref_updates;
2f8acdb3 195extern int warn_ambiguous_refs;
457f06d6 196extern int shared_repository;
2ae1c53b 197extern const char *apply_default_whitespace;
12f6c308 198extern int zlib_compression_level;
77ccc5bb 199extern size_t packed_git_limit;
17712991 200
ab9cb76f
JH		 201#define GIT_REPO_VERSION 0
202extern int repository_format_version;
203extern int check_repository_format(void);
204
734aab75
LT		 205#define MTIME_CHANGED 0x0001
206#define CTIME_CHANGED 0x0002
207#define OWNER_CHANGED 0x0004
208#define MODE_CHANGED 0x0008
209#define INODE_CHANGED 0x0010
210#define DATA_CHANGED 0x0020
8ae0a8c5 211#define TYPE_CHANGED 0x0040
e83c5163
LT		 212
213/* Return a statically allocated filename matching the sha1 signature */
4ec99bf0
TS		 214extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
215extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
73134b6d 216extern char *sha1_file_name(const unsigned char *sha1);
bf592c50
DB		 217extern char *sha1_pack_name(const unsigned char *sha1);
218extern char *sha1_pack_index_name(const unsigned char *sha1);
013f276e 219extern const char *find_unique_abbrev(const unsigned char *sha1, int);
88cd621d 220extern const unsigned char null_sha1[20];
0bef57ee
DR		 221static inline int is_null_sha1(const unsigned char *sha1)
222{
223 return !memcmp(sha1, null_sha1, 20);
224}
a89fccd2
DR		 225static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
226{
227 return memcmp(sha1, sha2, 20);
228}
e702496e
SP		 229static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
230{
231 memcpy(sha_dst, sha_src, 20);
232}
a8e0d16d
JH		 233static inline void hashclr(unsigned char *hash)
234{
235 memset(hash, 0, 20);
236}
e83c5163 237
f2db68ed
HE		 238int git_mkstemp(char *path, size_t n, const char *template);
239
94df2506
JH		 240enum sharedrepo {
241 PERM_UMASK = 0,
242 PERM_GROUP,
243 PERM_EVERYBODY
244};
245int git_config_perm(const char *var, const char *value);
457f06d6 246int adjust_shared_perm(const char *path);
b2cb9425 247int safe_create_leading_directories(char *path);
bd22c904 248char *enter_repo(char *path, int strict);
b2cb9425 249
e83c5163 250/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
36e4d74a 251extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
2ade9340 252extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
73134b6d 253extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
abdc3fc8 254extern int hash_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *sha1);
bf0f910d 255extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
8237b185 256
5d6ccf5c 257extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
e83c5163 258
70b9829e
DB		 259extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
260 size_t bufsize, size_t *bufposn);
a5eda52b 261extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
839837b9 262extern int move_temp_to_file(const char *tmpfile, const char *filename);
8237b185 263
106d710b 264extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
8237b185 265extern int has_sha1_file(const unsigned char *sha1);
bb6b8e4f
JH		 266extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
267extern int legacy_loose_object(unsigned char *);
8237b185 268
bf592c50
DB		 269extern int has_pack_file(const unsigned char *sha1);
270extern int has_pack_index(const unsigned char *sha1);
271
72518e9c
JH		 272enum object_type {
273 OBJ_NONE = 0,
274 OBJ_COMMIT = 1,
275 OBJ_TREE = 2,
276 OBJ_BLOB = 3,
277 OBJ_TAG = 4,
eb32d236
NP		 278 /* 5 for future expansion */
279 OBJ_OFS_DELTA = 6,
280 OBJ_REF_DELTA = 7,
72518e9c
JH		 281 OBJ_BAD,
282};
283
e49521b5
JH		 284extern signed char hexval_table[256];
285static inline unsigned int hexval(unsigned int c)
286{
287 return hexval_table[c];
288}
289
e83c5163 290/* Convert to/from hex/sha1 representation */
46a6c262
JH		 291#define MINIMUM_ABBREV 4
292#define DEFAULT_ABBREV 7
293
3c249c95 294extern int get_sha1(const char *str, unsigned char *sha1);
197ee8c9
LT		 295extern int get_sha1_hex(const char *hex, unsigned char *sha1);
296extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
ca8db142 297extern int read_ref(const char *filename, unsigned char *sha1);
8da19775 298extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
ed378ec7
LT		 299extern int create_symref(const char *ref, const char *refs_heads_master);
300extern int validate_symref(const char *ref);
e83c5163 301
958ba6c9 302extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
79517a06 303extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
e83c5163 304
40469ee9 305extern void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 306 const char *required_type,
40469ee9
JH		 307 unsigned long *size,
308 unsigned char *sha1_ret);
f4913f91 309
9a8e35e9 310const char *show_date(unsigned long time, int timezone, int relative);
2a387043 311const char *show_rfc2822_date(unsigned long time, int timezone);
2a39064c 312int parse_date(const char *date, char *buf, int bufsize);
ecee9d9e 313void datestamp(char *buf, int bufsize);
3c07b1d1 314unsigned long approxidate(const char *);
ecee9d9e 315
6aa33f40 316extern int setup_ident(void);
a7f196a7 317extern void ignore_missing_committer_name();
749be728
JH		 318extern const char *git_author_info(int);
319extern const char *git_committer_info(int);
6aa33f40 320
12dccc16
LT		 321struct checkout {
322 const char *base_dir;
323 int base_dir_len;
324 unsigned force:1,
325 quiet:1,
326 not_new:1,
327 refresh_cache:1;
328};
329
de84f99c 330extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
12dccc16 331
9a217f2a 332extern struct alternate_object_database {
d5a63b99 333 struct alternate_object_database *next;
9a217f2a 334 char *name;
8f1d2e6f 335 char base[FLEX_ARRAY]; /* more */
d5a63b99 336} *alt_odb_list;
9a217f2a
JH		 337extern void prepare_alt_odb(void);
338
339extern struct packed_git {
340 struct packed_git *next;
341 unsigned long index_size;
342 unsigned long pack_size;
343 unsigned int *index_base;
344 void *pack_base;
345 unsigned int pack_last_used;
f9253394 346 unsigned int pack_use_cnt;
9d835df2 347 int pack_local;
bf592c50 348 unsigned char sha1[20];
8f1d2e6f
JH		 349 /* something like ".git/objects/pack/xxxxx.pack" */
350 char pack_name[FLEX_ARRAY]; /* more */
9a217f2a 351} *packed_git;
f3bf9224
JH		 352
353struct pack_entry {
354 unsigned int offset;
355 unsigned char sha1[20];
356 struct packed_git *p;
357};
358
d1c133f5
LT		 359struct ref {
360 struct ref *next;
361 unsigned char old_sha1[20];
362 unsigned char new_sha1[20];
ff27adf3 363 unsigned char force;
f88395ac 364 struct ref *peer_ref; /* when renaming */
8f1d2e6f 365 char name[FLEX_ARRAY]; /* more */
d1c133f5
LT		 366};
367
2718ff09
LT		 368#define REF_NORMAL (1u << 0)
369#define REF_HEADS (1u << 1)
370#define REF_TAGS (1u << 2)
371
f42a5c4e 372extern pid_t git_connect(int fd[2], char *url, const char *prog);
f7192598 373extern int finish_connect(pid_t pid);
013e7c7f 374extern int path_match(const char *path, int nr, char **match);
f88395ac
JH		 375extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
376 int nr_refspec, char **refspec, int all);
41cb7488 377extern int get_ack(int fd, unsigned char *result_sha1);
2718ff09 378extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
211b5f9e 379extern int server_supports(const char *feature);
f7192598 380
bf592c50 381extern struct packed_git *parse_pack_index(unsigned char *sha1);
2ab141a2 382extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
c508df5e 383 char *idx_path);
bf592c50 384
9a217f2a 385extern void prepare_packed_git(void);
fc04c412 386extern void reprepare_packed_git(void);
bf592c50
DB		 387extern void install_packed_git(struct packed_git *pack);
388
389extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
390 struct packed_git *packs);
391
f9253394
JH		 392extern int use_packed_git(struct packed_git *);
393extern void unuse_packed_git(struct packed_git *);
9d835df2 394extern struct packed_git *add_packed_git(char *, int, int);
9a217f2a
JH		 395extern int num_packed_objects(const struct packed_git *p);
396extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
43057304 397extern unsigned long find_pack_entry_one(const unsigned char *, struct packed_git *);
4d703a1a 398extern void *unpack_entry(struct packed_git *, unsigned long, char *, unsigned long *);
72518e9c 399extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
43057304 400extern void packed_object_info_detail(struct packed_git *, unsigned long, char *, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
9a217f2a 401
8f3f9b09
JH		 402/* Dumb servers support */
403extern int update_server_info(int);
404
17712991
LT		 405typedef int (*config_fn_t)(const char *, const char *);
406extern int git_default_config(const char *, const char *);
4f629539 407extern int git_config_from_file(config_fn_t fn, const char *);
17712991
LT		 408extern int git_config(config_fn_t fn);
409extern int git_config_int(const char *, const char *);
410extern int git_config_bool(const char *, const char *);
10bea152 411extern int git_config_set(const char *, const char *);
4ddba79d 412extern int git_config_set_multivar(const char *, const char *, const char *, int);
0667fcfb 413extern int git_config_rename_section(const char *, const char *);
ab9cb76f 414extern int check_repository_format_version(const char *var, const char *value);
17712991 415
e1b10391
LT		 416#define MAX_GITNAME (1000)
417extern char git_default_email[MAX_GITNAME];
418extern char git_default_name[MAX_GITNAME];
419
d2c11a38
JH		 420extern char *git_commit_encoding;
421extern char *git_log_output_encoding;
4e72dcec 422
f3123c4a 423extern int copy_fd(int ifd, int ofd);
7230e6d0 424extern void write_or_die(int fd, const void *buf, size_t count);
6ce4e61f 425extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
ad897215 426
f67b45f8
LT		 427/* pager.c */
428extern void setup_pager(void);
85fb65ed 429extern int pager_in_use;
aa086eb8 430extern int pager_use_color;
f67b45f8 431
051308f6
JH		 432/* base85 */
433int decode_85(char *dst, char *line, int linelen);
0660626c 434void encode_85(char *buf, unsigned char *data, int bytes);
051308f6 435
855419f7
LT		 436/* alloc.c */
437struct blob;
438struct tree;
439struct commit;
440struct tag;
441extern struct blob *alloc_blob_node(void);
442extern struct tree *alloc_tree_node(void);
443extern struct commit *alloc_commit_node(void);
444extern struct tag *alloc_tag_node(void);
445extern void alloc_report(void);
446
6ce4e61f
CC		 447/* trace.c */
448extern int nfvasprintf(char **str, const char *fmt, va_list va);
449extern void trace_printf(const char *format, ...);
450extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
451
e83c5163 452#endif /* CACHE_H */
Unnamed repository; edit this file 'description' to name the repository.