Custom compression levels for objects and packs
[git/git.git] / 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 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
28 #define S_IFINVALID 0030000
29
30 /*
31 * A "directory link" is a link to another git directory.
32 *
33 * The value 0160000 is not normally a valid mode, and
34 * also just happens to be S_IFDIR + S_IFLNK
35 *
36 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
37 * always having the same values everywhere. We should use
38 * our internal git values for these things, and then we can
39 * translate that to the OS-specific value. It just so
40 * happens that everybody shares the same bit representation
41 * in the UNIX world (and apparently wider too..)
42 */
43 #define S_IFDIRLNK 0160000
44 #define S_ISDIRLNK(m) (((m) & S_IFMT) == S_IFDIRLNK)
45
46 /*
47 * Intensive research over the course of many years has shown that
48 * port 9418 is totally unused by anything else. Or
49 *
50 * Your search - "port 9418" - did not match any documents.
51 *
52 * as www.google.com puts it.
53 *
54 * This port has been properly assigned for git use by IANA:
55 * git (Assigned-9418) [I06-050728-0001].
56 *
57 * git 9418/tcp git pack transfer service
58 * git 9418/udp git pack transfer service
59 *
60 * with Linus Torvalds <torvalds@osdl.org> as the point of
61 * contact. September 2005.
62 *
63 * See http://www.iana.org/assignments/port-numbers
64 */
65 #define DEFAULT_GIT_PORT 9418
66
67 /*
68 * Basic data structures for the directory cache
69 */
70
71 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
72 struct cache_header {
73 unsigned int hdr_signature;
74 unsigned int hdr_version;
75 unsigned int hdr_entries;
76 };
77
78 /*
79 * The "cache_time" is just the low 32 bits of the
80 * time. It doesn't matter if it overflows - we only
81 * check it for equality in the 32 bits we save.
82 */
83 struct cache_time {
84 unsigned int sec;
85 unsigned int nsec;
86 };
87
88 /*
89 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
90 * Again - this is just a (very strong in practice) heuristic that
91 * the inode hasn't changed.
92 *
93 * We save the fields in big-endian order to allow using the
94 * index file over NFS transparently.
95 */
96 struct cache_entry {
97 struct cache_time ce_ctime;
98 struct cache_time ce_mtime;
99 unsigned int ce_dev;
100 unsigned int ce_ino;
101 unsigned int ce_mode;
102 unsigned int ce_uid;
103 unsigned int ce_gid;
104 unsigned int ce_size;
105 unsigned char sha1[20];
106 unsigned short ce_flags;
107 char name[FLEX_ARRAY]; /* more */
108 };
109
110 #define CE_NAMEMASK (0x0fff)
111 #define CE_STAGEMASK (0x3000)
112 #define CE_UPDATE (0x4000)
113 #define CE_VALID (0x8000)
114 #define CE_STAGESHIFT 12
115
116 #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
117 #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
118 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
119 #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
120
121 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
122 static inline unsigned int create_ce_mode(unsigned int mode)
123 {
124 if (S_ISLNK(mode))
125 return htonl(S_IFLNK);
126 if (S_ISDIR(mode) || S_ISDIRLNK(mode))
127 return htonl(S_IFDIRLNK);
128 return htonl(S_IFREG | ce_permissions(mode));
129 }
130 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
131 {
132 extern int trust_executable_bit, has_symlinks;
133 if (!has_symlinks && S_ISREG(mode) &&
134 ce && S_ISLNK(ntohl(ce->ce_mode)))
135 return ce->ce_mode;
136 if (!trust_executable_bit && S_ISREG(mode)) {
137 if (ce && S_ISREG(ntohl(ce->ce_mode)))
138 return ce->ce_mode;
139 return create_ce_mode(0666);
140 }
141 return create_ce_mode(mode);
142 }
143 #define canon_mode(mode) \
144 (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
145 S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFDIRLNK)
146
147 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
148
149 struct index_state {
150 struct cache_entry **cache;
151 unsigned int cache_nr, cache_alloc, cache_changed;
152 struct cache_tree *cache_tree;
153 time_t timestamp;
154 void *mmap;
155 size_t mmap_size;
156 };
157
158 extern struct index_state the_index;
159
160 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
161 #define active_cache (the_index.cache)
162 #define active_nr (the_index.cache_nr)
163 #define active_alloc (the_index.cache_alloc)
164 #define active_cache_changed (the_index.cache_changed)
165 #define active_cache_tree (the_index.cache_tree)
166
167 #define read_cache() read_index(&the_index)
168 #define read_cache_from(path) read_index_from(&the_index, (path))
169 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
170 #define discard_cache() discard_index(&the_index)
171 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
172 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
173 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
174 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
175 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
176 #define refresh_cache(flags) refresh_index(&the_index, flags)
177 #define ce_match_stat(ce, st, really) ie_match_stat(&the_index, (ce), (st), (really))
178 #define ce_modified(ce, st, really) ie_modified(&the_index, (ce), (st), (really))
179 #endif
180
181 enum object_type {
182 OBJ_BAD = -1,
183 OBJ_NONE = 0,
184 OBJ_COMMIT = 1,
185 OBJ_TREE = 2,
186 OBJ_BLOB = 3,
187 OBJ_TAG = 4,
188 /* 5 for future expansion */
189 OBJ_OFS_DELTA = 6,
190 OBJ_REF_DELTA = 7,
191 OBJ_MAX,
192 };
193
194 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
195 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
196 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
197 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
198 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
199 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
200 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
201 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
202 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
203 #define GITATTRIBUTES_FILE ".gitattributes"
204 #define INFOATTRIBUTES_FILE "info/attributes"
205 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
206
207 extern int is_bare_repository_cfg;
208 extern int is_bare_repository(void);
209 extern int is_inside_git_dir(void);
210 extern const char *get_git_dir(void);
211 extern char *get_object_directory(void);
212 extern char *get_refs_directory(void);
213 extern char *get_index_file(void);
214 extern char *get_graft_file(void);
215
216 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
217
218 extern const char **get_pathspec(const char *prefix, const char **pathspec);
219 extern const char *setup_git_directory_gently(int *);
220 extern const char *setup_git_directory(void);
221 extern const char *prefix_path(const char *prefix, int len, const char *path);
222 extern const char *prefix_filename(const char *prefix, int len, const char *path);
223 extern void verify_filename(const char *prefix, const char *name);
224 extern void verify_non_filename(const char *prefix, const char *name);
225
226 #define alloc_nr(x) (((x)+16)*3/2)
227
228 /* Initialize and use the cache information */
229 extern int read_index(struct index_state *);
230 extern int read_index_from(struct index_state *, const char *path);
231 extern int write_index(struct index_state *, int newfd);
232 extern int discard_index(struct index_state *);
233 extern int verify_path(const char *path);
234 extern int index_name_pos(struct index_state *, const char *name, int namelen);
235 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
236 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
237 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
238 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
239 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
240 extern int remove_index_entry_at(struct index_state *, int pos);
241 extern int remove_file_from_index(struct index_state *, const char *path);
242 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
243 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
244 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int);
245 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int);
246 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
247 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
248 extern int read_pipe(int fd, char** return_buf, unsigned long* return_size);
249 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
250 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
251 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
252
253 #define REFRESH_REALLY 0x0001 /* ignore_valid */
254 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
255 #define REFRESH_QUIET 0x0004 /* be quiet about it */
256 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
257 extern int refresh_index(struct index_state *, unsigned int flags);
258
259 struct lock_file {
260 struct lock_file *next;
261 pid_t owner;
262 char on_list;
263 char filename[PATH_MAX];
264 };
265 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
266 extern int commit_lock_file(struct lock_file *);
267
268 extern int hold_locked_index(struct lock_file *, int);
269 extern int commit_locked_index(struct lock_file *);
270 extern void set_alternate_index_output(const char *);
271
272 extern void rollback_lock_file(struct lock_file *);
273 extern int delete_ref(const char *, const unsigned char *sha1);
274
275 /* Environment bits from configuration mechanism */
276 extern int use_legacy_headers;
277 extern int trust_executable_bit;
278 extern int has_symlinks;
279 extern int assume_unchanged;
280 extern int prefer_symlink_refs;
281 extern int log_all_ref_updates;
282 extern int warn_ambiguous_refs;
283 extern int shared_repository;
284 extern const char *apply_default_whitespace;
285 extern int zlib_compression_level;
286 extern int core_compression_level;
287 extern int core_compression_seen;
288 extern size_t packed_git_window_size;
289 extern size_t packed_git_limit;
290 extern size_t delta_base_cache_limit;
291 extern int auto_crlf;
292
293 #define GIT_REPO_VERSION 0
294 extern int repository_format_version;
295 extern int check_repository_format(void);
296
297 #define MTIME_CHANGED 0x0001
298 #define CTIME_CHANGED 0x0002
299 #define OWNER_CHANGED 0x0004
300 #define MODE_CHANGED 0x0008
301 #define INODE_CHANGED 0x0010
302 #define DATA_CHANGED 0x0020
303 #define TYPE_CHANGED 0x0040
304
305 /* Return a statically allocated filename matching the sha1 signature */
306 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
307 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
308 extern char *sha1_file_name(const unsigned char *sha1);
309 extern char *sha1_pack_name(const unsigned char *sha1);
310 extern char *sha1_pack_index_name(const unsigned char *sha1);
311 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
312 extern const unsigned char null_sha1[20];
313 static inline int is_null_sha1(const unsigned char *sha1)
314 {
315 return !memcmp(sha1, null_sha1, 20);
316 }
317 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
318 {
319 return memcmp(sha1, sha2, 20);
320 }
321 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
322 {
323 memcpy(sha_dst, sha_src, 20);
324 }
325 static inline void hashclr(unsigned char *hash)
326 {
327 memset(hash, 0, 20);
328 }
329
330 int git_mkstemp(char *path, size_t n, const char *template);
331
332 enum sharedrepo {
333 PERM_UMASK = 0,
334 PERM_GROUP,
335 PERM_EVERYBODY
336 };
337 int git_config_perm(const char *var, const char *value);
338 int adjust_shared_perm(const char *path);
339 int safe_create_leading_directories(char *path);
340 char *enter_repo(char *path, int strict);
341
342 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
343 extern int sha1_object_info(const unsigned char *, unsigned long *);
344 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
345 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
346 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
347 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
348
349 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
350
351 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
352 size_t bufsize, size_t *bufposn);
353 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
354 extern int move_temp_to_file(const char *tmpfile, const char *filename);
355
356 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
357 extern int has_sha1_file(const unsigned char *sha1);
358 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *);
359 extern int legacy_loose_object(unsigned char *);
360
361 extern int has_pack_file(const unsigned char *sha1);
362 extern int has_pack_index(const unsigned char *sha1);
363
364 extern signed char hexval_table[256];
365 static inline unsigned int hexval(unsigned int c)
366 {
367 return hexval_table[c];
368 }
369
370 /* Convert to/from hex/sha1 representation */
371 #define MINIMUM_ABBREV 4
372 #define DEFAULT_ABBREV 7
373
374 extern int get_sha1(const char *str, unsigned char *sha1);
375 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
376 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
377 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
378 extern int read_ref(const char *filename, unsigned char *sha1);
379 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
380 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
381 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
382
383 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
384 extern int validate_headref(const char *ref);
385
386 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
387 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
388
389 extern void *read_object_with_reference(const unsigned char *sha1,
390 const char *required_type,
391 unsigned long *size,
392 unsigned char *sha1_ret);
393
394 enum date_mode { DATE_NORMAL = 0, DATE_RELATIVE, DATE_SHORT, DATE_LOCAL };
395 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
396 const char *show_rfc2822_date(unsigned long time, int timezone);
397 int parse_date(const char *date, char *buf, int bufsize);
398 void datestamp(char *buf, int bufsize);
399 unsigned long approxidate(const char *);
400
401 extern const char *git_author_info(int);
402 extern const char *git_committer_info(int);
403 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
404
405 struct checkout {
406 const char *base_dir;
407 int base_dir_len;
408 unsigned force:1,
409 quiet:1,
410 not_new:1,
411 refresh_cache:1;
412 };
413
414 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
415
416 extern struct alternate_object_database {
417 struct alternate_object_database *next;
418 char *name;
419 char base[FLEX_ARRAY]; /* more */
420 } *alt_odb_list;
421 extern void prepare_alt_odb(void);
422
423 struct pack_window {
424 struct pack_window *next;
425 unsigned char *base;
426 off_t offset;
427 size_t len;
428 unsigned int last_used;
429 unsigned int inuse_cnt;
430 };
431
432 extern struct packed_git {
433 struct packed_git *next;
434 struct pack_window *windows;
435 off_t pack_size;
436 const void *index_data;
437 size_t index_size;
438 uint32_t num_objects;
439 int index_version;
440 time_t mtime;
441 int pack_fd;
442 int pack_local;
443 unsigned char sha1[20];
444 /* something like ".git/objects/pack/xxxxx.pack" */
445 char pack_name[FLEX_ARRAY]; /* more */
446 } *packed_git;
447
448 struct pack_entry {
449 off_t offset;
450 unsigned char sha1[20];
451 struct packed_git *p;
452 };
453
454 struct ref {
455 struct ref *next;
456 unsigned char old_sha1[20];
457 unsigned char new_sha1[20];
458 unsigned char force;
459 struct ref *peer_ref; /* when renaming */
460 char name[FLEX_ARRAY]; /* more */
461 };
462
463 #define REF_NORMAL (1u << 0)
464 #define REF_HEADS (1u << 1)
465 #define REF_TAGS (1u << 2)
466
467 extern pid_t git_connect(int fd[2], char *url, const char *prog);
468 extern int finish_connect(pid_t pid);
469 extern int path_match(const char *path, int nr, char **match);
470 extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
471 int nr_refspec, char **refspec, int all);
472 extern int get_ack(int fd, unsigned char *result_sha1);
473 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
474 extern int server_supports(const char *feature);
475
476 extern struct packed_git *parse_pack_index(unsigned char *sha1);
477 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
478 const char *idx_path);
479
480 extern void prepare_packed_git(void);
481 extern void reprepare_packed_git(void);
482 extern void install_packed_git(struct packed_git *pack);
483
484 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
485 struct packed_git *packs);
486
487 extern void pack_report(void);
488 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
489 extern void unuse_pack(struct pack_window **);
490 extern struct packed_git *add_packed_git(const char *, int, int);
491 extern const unsigned char *nth_packed_object_sha1(const struct packed_git *, uint32_t);
492 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
493 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
494 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
495 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
496 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
497
498 /* Dumb servers support */
499 extern int update_server_info(int);
500
501 typedef int (*config_fn_t)(const char *, const char *);
502 extern int git_default_config(const char *, const char *);
503 extern int git_config_from_file(config_fn_t fn, const char *);
504 extern int git_config(config_fn_t fn);
505 extern int git_config_int(const char *, const char *);
506 extern int git_config_bool(const char *, const char *);
507 extern int git_config_set(const char *, const char *);
508 extern int git_config_set_multivar(const char *, const char *, const char *, int);
509 extern int git_config_rename_section(const char *, const char *);
510 extern int check_repository_format_version(const char *var, const char *value);
511
512 #define MAX_GITNAME (1000)
513 extern char git_default_email[MAX_GITNAME];
514 extern char git_default_name[MAX_GITNAME];
515
516 extern const char *git_commit_encoding;
517 extern const char *git_log_output_encoding;
518
519 extern int copy_fd(int ifd, int ofd);
520 extern int read_in_full(int fd, void *buf, size_t count);
521 extern int write_in_full(int fd, const void *buf, size_t count);
522 extern void write_or_die(int fd, const void *buf, size_t count);
523 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
524 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
525
526 /* pager.c */
527 extern void setup_pager(void);
528 extern int pager_in_use;
529 extern int pager_use_color;
530
531 /* base85 */
532 int decode_85(char *dst, const char *line, int linelen);
533 void encode_85(char *buf, const unsigned char *data, int bytes);
534
535 /* alloc.c */
536 extern void *alloc_blob_node(void);
537 extern void *alloc_tree_node(void);
538 extern void *alloc_commit_node(void);
539 extern void *alloc_tag_node(void);
540 extern void *alloc_object_node(void);
541 extern void alloc_report(void);
542
543 /* trace.c */
544 extern int nfasprintf(char **str, const char *fmt, ...);
545 extern int nfvasprintf(char **str, const char *fmt, va_list va);
546 extern void trace_printf(const char *format, ...);
547 extern void trace_argv_printf(const char **argv, int count, const char *format, ...);
548
549 /* convert.c */
550 extern char *convert_to_git(const char *path, const char *src, unsigned long *sizep);
551 extern char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep);
552
553 /* match-trees.c */
554 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
555
556 #endif /* CACHE_H */