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Add specialized object allocator
[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;
e83c5163 118
8ac069ac
JH		 119#define GIT_DIR_ENVIRONMENT "GIT_DIR"
120#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
d19938ab 121#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
bb233d69 122#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
5da5c8f4 123#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
bb233d69 124
5da1606d 125extern char *get_git_dir(void);
8ac069ac 126extern char *get_object_directory(void);
95fc7512 127extern char *get_refs_directory(void);
8ac069ac 128extern char *get_index_file(void);
5da5c8f4 129extern char *get_graft_file(void);
8ac069ac
JH		 130
131#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
bb233d69 132
6b5ee137 133extern const char **get_pathspec(const char *prefix, const char **pathspec);
4ca06608 134extern const char *setup_git_directory_gently(int *);
d288a700 135extern const char *setup_git_directory(void);
6b5ee137 136extern const char *prefix_path(const char *prefix, int len, const char *path);
4ca06608 137extern const char *prefix_filename(const char *prefix, int len, const char *path);
e23d0b4a 138extern void verify_filename(const char *prefix, const char *name);
ea92f41f 139extern void verify_non_filename(const char *prefix, const char *name);
d288a700 140
e83c5163
LT		 141#define alloc_nr(x) (((x)+16)*3/2)
142
734aab75 143/* Initialize and use the cache information */
e83c5163 144extern int read_cache(void);
197ee8c9 145extern int write_cache(int newfd, struct cache_entry **cache, int entries);
8dcf39c4 146extern int verify_path(const char *path);
eb38c22f 147extern int cache_name_pos(const char *name, int namelen);
192268c1
JH		 148#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
149#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
b155725d 150#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
192268c1 151extern int add_cache_entry(struct cache_entry *ce, int option);
dbbce55b 152extern int remove_cache_entry_at(int pos);
6b5ee137 153extern int remove_file_from_cache(const char *path);
dbbce55b 154extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
5f73076c
JH		 155extern int ce_match_stat(struct cache_entry *ce, struct stat *st, int);
156extern int ce_modified(struct cache_entry *ce, struct stat *st, int);
c0fd1f51 157extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
7672db20 158extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
e7332f96 159extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
024510c8 160extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
ec1fcc16 161extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
415e96c8
JH		 162extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
163
405e5b2f
LT		 164#define REFRESH_REALLY 0x0001 /* ignore_valid */
165#define REFRESH_UNMERGED 0x0002 /* allow unmerged */
166#define REFRESH_QUIET 0x0004 /* be quiet about it */
167#define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
168extern int refresh_cache(unsigned int flags);
169
021b6e45
JH		 170struct lock_file {
171 struct lock_file *next;
172 char filename[PATH_MAX];
415e96c8 173};
021b6e45
JH		 174extern int hold_lock_file_for_update(struct lock_file *, const char *path);
175extern int commit_lock_file(struct lock_file *);
176extern void rollback_lock_file(struct lock_file *);
734aab75 177
2ae1c53b 178/* Environment bits from configuration mechanism */
17712991 179extern int trust_executable_bit;
5f73076c 180extern int assume_unchanged;
9f0bb90d 181extern int prefer_symlink_refs;
6de08ae6 182extern int log_all_ref_updates;
2f8acdb3 183extern int warn_ambiguous_refs;
3299c6f6 184extern int diff_rename_limit_default;
457f06d6 185extern int shared_repository;
2ae1c53b 186extern const char *apply_default_whitespace;
17712991 187
ab9cb76f
JH		 188#define GIT_REPO_VERSION 0
189extern int repository_format_version;
190extern int check_repository_format(void);
191
734aab75
LT		 192#define MTIME_CHANGED 0x0001
193#define CTIME_CHANGED 0x0002
194#define OWNER_CHANGED 0x0004
195#define MODE_CHANGED 0x0008
196#define INODE_CHANGED 0x0010
197#define DATA_CHANGED 0x0020
8ae0a8c5 198#define TYPE_CHANGED 0x0040
e83c5163
LT		 199
200/* Return a statically allocated filename matching the sha1 signature */
4ec99bf0
TS		 201extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
202extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
73134b6d 203extern char *sha1_file_name(const unsigned char *sha1);
bf592c50
DB		 204extern char *sha1_pack_name(const unsigned char *sha1);
205extern char *sha1_pack_index_name(const unsigned char *sha1);
013f276e 206extern const char *find_unique_abbrev(const unsigned char *sha1, int);
88cd621d 207extern const unsigned char null_sha1[20];
e83c5163 208
f2db68ed
HE		 209int git_mkstemp(char *path, size_t n, const char *template);
210
94df2506
JH		 211enum sharedrepo {
212 PERM_UMASK = 0,
213 PERM_GROUP,
214 PERM_EVERYBODY
215};
216int git_config_perm(const char *var, const char *value);
457f06d6 217int adjust_shared_perm(const char *path);
b2cb9425 218int safe_create_leading_directories(char *path);
bfbd0bb6 219size_t safe_strncpy(char *, const char *, size_t);
bd22c904 220char *enter_repo(char *path, int strict);
b2cb9425 221
e83c5163 222/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
c4483576 223extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
5180cacc 224extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
36e4d74a 225extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
2ade9340 226extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
73134b6d 227extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
bf0f910d 228extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
7672db20
BL		 229extern char *write_sha1_file_prepare(void *buf,
230 unsigned long len,
231 const char *type,
232 unsigned char *sha1,
233 unsigned char *hdr,
234 int *hdrlen);
8237b185 235
5d6ccf5c 236extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
e83c5163 237
70b9829e
DB		 238extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
239 size_t bufsize, size_t *bufposn);
a5eda52b 240extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
b721e01f 241extern int move_temp_to_file(const char *tmpfile, char *filename);
8237b185 242
dade09c2 243extern int has_sha1_pack(const unsigned char *sha1);
8237b185
DB		 244extern int has_sha1_file(const unsigned char *sha1);
245
bf592c50
DB		 246extern int has_pack_file(const unsigned char *sha1);
247extern int has_pack_index(const unsigned char *sha1);
248
e83c5163 249/* Convert to/from hex/sha1 representation */
46a6c262
JH		 250#define MINIMUM_ABBREV 4
251#define DEFAULT_ABBREV 7
252
3c249c95 253extern int get_sha1(const char *str, unsigned char *sha1);
197ee8c9
LT		 254extern int get_sha1_hex(const char *hex, unsigned char *sha1);
255extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
ca8db142 256extern int read_ref(const char *filename, unsigned char *sha1);
a876ed83 257extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
8098a178
JH		 258extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
259extern int validate_symref(const char *git_HEAD);
e83c5163 260
958ba6c9 261extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
79517a06 262extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
e83c5163 263
40469ee9 264extern void *read_object_with_reference(const unsigned char *sha1,
bf0f910d 265 const char *required_type,
40469ee9
JH		 266 unsigned long *size,
267 unsigned char *sha1_ret);
f4913f91 268
f80cd783 269const char *show_date(unsigned long time, int timezone);
2a387043 270const char *show_rfc2822_date(unsigned long time, int timezone);
2a39064c 271int parse_date(const char *date, char *buf, int bufsize);
ecee9d9e 272void datestamp(char *buf, int bufsize);
3c07b1d1 273unsigned long approxidate(const char *);
ecee9d9e 274
6aa33f40 275extern int setup_ident(void);
749be728
JH		 276extern const char *git_author_info(int);
277extern const char *git_committer_info(int);
6aa33f40 278
12dccc16
LT		 279struct checkout {
280 const char *base_dir;
281 int base_dir_len;
282 unsigned force:1,
283 quiet:1,
284 not_new:1,
285 refresh_cache:1;
286};
287
de84f99c 288extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
12dccc16 289
9a217f2a 290extern struct alternate_object_database {
d5a63b99 291 struct alternate_object_database *next;
9a217f2a 292 char *name;
8f1d2e6f 293 char base[FLEX_ARRAY]; /* more */
d5a63b99 294} *alt_odb_list;
9a217f2a
JH		 295extern void prepare_alt_odb(void);
296
297extern struct packed_git {
298 struct packed_git *next;
299 unsigned long index_size;
300 unsigned long pack_size;
301 unsigned int *index_base;
302 void *pack_base;
303 unsigned int pack_last_used;
f9253394 304 unsigned int pack_use_cnt;
9d835df2 305 int pack_local;
bf592c50 306 unsigned char sha1[20];
8f1d2e6f
JH		 307 /* something like ".git/objects/pack/xxxxx.pack" */
308 char pack_name[FLEX_ARRAY]; /* more */
9a217f2a 309} *packed_git;
f3bf9224
JH		 310
311struct pack_entry {
312 unsigned int offset;
313 unsigned char sha1[20];
314 struct packed_git *p;
315};
316
d1c133f5
LT		 317struct ref {
318 struct ref *next;
319 unsigned char old_sha1[20];
320 unsigned char new_sha1[20];
ff27adf3 321 unsigned char force;
f88395ac 322 struct ref *peer_ref; /* when renaming */
8f1d2e6f 323 char name[FLEX_ARRAY]; /* more */
d1c133f5
LT		 324};
325
f7192598
LT		 326extern int git_connect(int fd[2], char *url, const char *prog);
327extern int finish_connect(pid_t pid);
013e7c7f 328extern int path_match(const char *path, int nr, char **match);
f88395ac
JH		 329extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
330 int nr_refspec, char **refspec, int all);
41cb7488 331extern int get_ack(int fd, unsigned char *result_sha1);
1a7141ff 332extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, int ignore_funny);
211b5f9e 333extern int server_supports(const char *feature);
f7192598 334
bf592c50 335extern struct packed_git *parse_pack_index(unsigned char *sha1);
2ab141a2 336extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
c508df5e 337 char *idx_path);
bf592c50 338
9a217f2a 339extern void prepare_packed_git(void);
bf592c50
DB		 340extern void install_packed_git(struct packed_git *pack);
341
342extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
343 struct packed_git *packs);
344
f9253394
JH		 345extern int use_packed_git(struct packed_git *);
346extern void unuse_packed_git(struct packed_git *);
9d835df2 347extern struct packed_git *add_packed_git(char *, int, int);
9a217f2a
JH		 348extern int num_packed_objects(const struct packed_git *p);
349extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
f3bf9224
JH		 350extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
351extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
f8f135c9 352extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
9a217f2a 353
8f3f9b09
JH		 354/* Dumb servers support */
355extern int update_server_info(int);
356
17712991
LT		 357typedef int (*config_fn_t)(const char *, const char *);
358extern int git_default_config(const char *, const char *);
4f629539 359extern int git_config_from_file(config_fn_t fn, const char *);
17712991
LT		 360extern int git_config(config_fn_t fn);
361extern int git_config_int(const char *, const char *);
362extern int git_config_bool(const char *, const char *);
10bea152 363extern int git_config_set(const char *, const char *);
4ddba79d 364extern int git_config_set_multivar(const char *, const char *, const char *, int);
ab9cb76f 365extern int check_repository_format_version(const char *var, const char *value);
17712991 366
e1b10391
LT		 367#define MAX_GITNAME (1000)
368extern char git_default_email[MAX_GITNAME];
369extern char git_default_name[MAX_GITNAME];
370
4e72dcec
JH		 371#define MAX_ENCODING_LENGTH 64
372extern char git_commit_encoding[MAX_ENCODING_LENGTH];
373
f3123c4a 374extern int copy_fd(int ifd, int ofd);
ad897215
JH		 375
376/* Finish off pack transfer receiving end */
377extern int receive_unpack_pack(int fd[2], const char *me, int quiet);
5ee2ad65 378extern int receive_keep_pack(int fd[2], const char *me, int quiet);
ad897215 379
f67b45f8
LT		 380/* pager.c */
381extern void setup_pager(void);
382
051308f6
JH		 383/* base85 */
384int decode_85(char *dst, char *line, int linelen);
0660626c 385void encode_85(char *buf, unsigned char *data, int bytes);
051308f6 386
855419f7
LT		 387/* alloc.c */
388struct blob;
389struct tree;
390struct commit;
391struct tag;
392extern struct blob *alloc_blob_node(void);
393extern struct tree *alloc_tree_node(void);
394extern struct commit *alloc_commit_node(void);
395extern struct tag *alloc_tag_node(void);
396extern void alloc_report(void);
397
e83c5163 398#endif /* CACHE_H */
Unnamed repository; edit this file 'description' to name the repository.