Merge branch 'dr/ceiling'
[git/git.git] / cache.h
1 #ifndef CACHE_H
2 #define CACHE_H
3
4 #include "git-compat-util.h"
5 #include "strbuf.h"
6 #include "hash.h"
7
8 #include SHA1_HEADER
9 #include <zlib.h>
10
11 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
12 #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
13 #endif
14
15 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
16 #define DTYPE(de) ((de)->d_type)
17 #else
18 #undef DT_UNKNOWN
19 #undef DT_DIR
20 #undef DT_REG
21 #undef DT_LNK
22 #define DT_UNKNOWN 0
23 #define DT_DIR 1
24 #define DT_REG 2
25 #define DT_LNK 3
26 #define DTYPE(de) DT_UNKNOWN
27 #endif
28
29 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
30 #define S_IFINVALID 0030000
31
32 /*
33 * A "directory link" is a link to another git directory.
34 *
35 * The value 0160000 is not normally a valid mode, and
36 * also just happens to be S_IFDIR + S_IFLNK
37 *
38 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
39 * always having the same values everywhere. We should use
40 * our internal git values for these things, and then we can
41 * translate that to the OS-specific value. It just so
42 * happens that everybody shares the same bit representation
43 * in the UNIX world (and apparently wider too..)
44 */
45 #define S_IFGITLINK 0160000
46 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
47
48 /*
49 * Intensive research over the course of many years has shown that
50 * port 9418 is totally unused by anything else. Or
51 *
52 * Your search - "port 9418" - did not match any documents.
53 *
54 * as www.google.com puts it.
55 *
56 * This port has been properly assigned for git use by IANA:
57 * git (Assigned-9418) [I06-050728-0001].
58 *
59 * git 9418/tcp git pack transfer service
60 * git 9418/udp git pack transfer service
61 *
62 * with Linus Torvalds <torvalds@osdl.org> as the point of
63 * contact. September 2005.
64 *
65 * See http://www.iana.org/assignments/port-numbers
66 */
67 #define DEFAULT_GIT_PORT 9418
68
69 /*
70 * Basic data structures for the directory cache
71 */
72
73 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
74 struct cache_header {
75 unsigned int hdr_signature;
76 unsigned int hdr_version;
77 unsigned int hdr_entries;
78 };
79
80 /*
81 * The "cache_time" is just the low 32 bits of the
82 * time. It doesn't matter if it overflows - we only
83 * check it for equality in the 32 bits we save.
84 */
85 struct cache_time {
86 unsigned int sec;
87 unsigned int nsec;
88 };
89
90 /*
91 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
92 * Again - this is just a (very strong in practice) heuristic that
93 * the inode hasn't changed.
94 *
95 * We save the fields in big-endian order to allow using the
96 * index file over NFS transparently.
97 */
98 struct ondisk_cache_entry {
99 struct cache_time ctime;
100 struct cache_time mtime;
101 unsigned int dev;
102 unsigned int ino;
103 unsigned int mode;
104 unsigned int uid;
105 unsigned int gid;
106 unsigned int size;
107 unsigned char sha1[20];
108 unsigned short flags;
109 char name[FLEX_ARRAY]; /* more */
110 };
111
112 struct cache_entry {
113 unsigned int ce_ctime;
114 unsigned int ce_mtime;
115 unsigned int ce_dev;
116 unsigned int ce_ino;
117 unsigned int ce_mode;
118 unsigned int ce_uid;
119 unsigned int ce_gid;
120 unsigned int ce_size;
121 unsigned int ce_flags;
122 unsigned char sha1[20];
123 struct cache_entry *next;
124 char name[FLEX_ARRAY]; /* more */
125 };
126
127 #define CE_NAMEMASK (0x0fff)
128 #define CE_STAGEMASK (0x3000)
129 #define CE_VALID (0x8000)
130 #define CE_STAGESHIFT 12
131
132 /* In-memory only */
133 #define CE_UPDATE (0x10000)
134 #define CE_REMOVE (0x20000)
135 #define CE_UPTODATE (0x40000)
136 #define CE_ADDED (0x80000)
137
138 #define CE_HASHED (0x100000)
139 #define CE_UNHASHED (0x200000)
140
141 /*
142 * Copy the sha1 and stat state of a cache entry from one to
143 * another. But we never change the name, or the hash state!
144 */
145 #define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
146 static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
147 {
148 unsigned int state = dst->ce_flags & CE_STATE_MASK;
149
150 /* Don't copy hash chain and name */
151 memcpy(dst, src, offsetof(struct cache_entry, next));
152
153 /* Restore the hash state */
154 dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
155 }
156
157 static inline unsigned create_ce_flags(size_t len, unsigned stage)
158 {
159 if (len >= CE_NAMEMASK)
160 len = CE_NAMEMASK;
161 return (len | (stage << CE_STAGESHIFT));
162 }
163
164 static inline size_t ce_namelen(const struct cache_entry *ce)
165 {
166 size_t len = ce->ce_flags & CE_NAMEMASK;
167 if (len < CE_NAMEMASK)
168 return len;
169 return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
170 }
171
172 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
173 #define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
174 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
175 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
176 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
177
178 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
179 static inline unsigned int create_ce_mode(unsigned int mode)
180 {
181 if (S_ISLNK(mode))
182 return S_IFLNK;
183 if (S_ISDIR(mode) || S_ISGITLINK(mode))
184 return S_IFGITLINK;
185 return S_IFREG | ce_permissions(mode);
186 }
187 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
188 {
189 extern int trust_executable_bit, has_symlinks;
190 if (!has_symlinks && S_ISREG(mode) &&
191 ce && S_ISLNK(ce->ce_mode))
192 return ce->ce_mode;
193 if (!trust_executable_bit && S_ISREG(mode)) {
194 if (ce && S_ISREG(ce->ce_mode))
195 return ce->ce_mode;
196 return create_ce_mode(0666);
197 }
198 return create_ce_mode(mode);
199 }
200 static inline int ce_to_dtype(const struct cache_entry *ce)
201 {
202 unsigned ce_mode = ntohl(ce->ce_mode);
203 if (S_ISREG(ce_mode))
204 return DT_REG;
205 else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
206 return DT_DIR;
207 else if (S_ISLNK(ce_mode))
208 return DT_LNK;
209 else
210 return DT_UNKNOWN;
211 }
212 #define canon_mode(mode) \
213 (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
214 S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
215
216 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
217 #define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
218
219 struct index_state {
220 struct cache_entry **cache;
221 unsigned int cache_nr, cache_alloc, cache_changed;
222 struct cache_tree *cache_tree;
223 time_t timestamp;
224 void *alloc;
225 unsigned name_hash_initialized : 1;
226 struct hash_table name_hash;
227 };
228
229 extern struct index_state the_index;
230
231 /* Name hashing */
232 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
233 /*
234 * We don't actually *remove* it, we can just mark it invalid so that
235 * we won't find it in lookups.
236 *
237 * Not only would we have to search the lists (simple enough), but
238 * we'd also have to rehash other hash buckets in case this makes the
239 * hash bucket empty (common). So it's much better to just mark
240 * it.
241 */
242 static inline void remove_name_hash(struct cache_entry *ce)
243 {
244 ce->ce_flags |= CE_UNHASHED;
245 }
246
247
248 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
249 #define active_cache (the_index.cache)
250 #define active_nr (the_index.cache_nr)
251 #define active_alloc (the_index.cache_alloc)
252 #define active_cache_changed (the_index.cache_changed)
253 #define active_cache_tree (the_index.cache_tree)
254
255 #define read_cache() read_index(&the_index)
256 #define read_cache_from(path) read_index_from(&the_index, (path))
257 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
258 #define discard_cache() discard_index(&the_index)
259 #define unmerged_cache() unmerged_index(&the_index)
260 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
261 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
262 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
263 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
264 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
265 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
266 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
267 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
268 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
269 #define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
270 #endif
271
272 enum object_type {
273 OBJ_BAD = -1,
274 OBJ_NONE = 0,
275 OBJ_COMMIT = 1,
276 OBJ_TREE = 2,
277 OBJ_BLOB = 3,
278 OBJ_TAG = 4,
279 /* 5 for future expansion */
280 OBJ_OFS_DELTA = 6,
281 OBJ_REF_DELTA = 7,
282 OBJ_ANY,
283 OBJ_MAX,
284 };
285
286 static inline enum object_type object_type(unsigned int mode)
287 {
288 return S_ISDIR(mode) ? OBJ_TREE :
289 S_ISGITLINK(mode) ? OBJ_COMMIT :
290 OBJ_BLOB;
291 }
292
293 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
294 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
295 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
296 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
297 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
298 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
299 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
300 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
301 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
302 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
303 #define GITATTRIBUTES_FILE ".gitattributes"
304 #define INFOATTRIBUTES_FILE "info/attributes"
305 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
306
307 extern int is_bare_repository_cfg;
308 extern int is_bare_repository(void);
309 extern int is_inside_git_dir(void);
310 extern char *git_work_tree_cfg;
311 extern int is_inside_work_tree(void);
312 extern const char *get_git_dir(void);
313 extern char *get_object_directory(void);
314 extern char *get_index_file(void);
315 extern char *get_graft_file(void);
316 extern int set_git_dir(const char *path);
317 extern const char *get_git_work_tree(void);
318 extern const char *read_gitfile_gently(const char *path);
319 extern void set_git_work_tree(const char *tree);
320
321 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
322
323 extern const char **get_pathspec(const char *prefix, const char **pathspec);
324 extern void setup_work_tree(void);
325 extern const char *setup_git_directory_gently(int *);
326 extern const char *setup_git_directory(void);
327 extern const char *prefix_path(const char *prefix, int len, const char *path);
328 extern const char *prefix_filename(const char *prefix, int len, const char *path);
329 extern void verify_filename(const char *prefix, const char *name);
330 extern void verify_non_filename(const char *prefix, const char *name);
331
332 #define INIT_DB_QUIET 0x0001
333
334 extern int init_db(const char *template_dir, unsigned int flags);
335
336 #define alloc_nr(x) (((x)+16)*3/2)
337
338 /*
339 * Realloc the buffer pointed at by variable 'x' so that it can hold
340 * at least 'nr' entries; the number of entries currently allocated
341 * is 'alloc', using the standard growing factor alloc_nr() macro.
342 *
343 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
344 */
345 #define ALLOC_GROW(x, nr, alloc) \
346 do { \
347 if ((nr) > alloc) { \
348 if (alloc_nr(alloc) < (nr)) \
349 alloc = (nr); \
350 else \
351 alloc = alloc_nr(alloc); \
352 x = xrealloc((x), alloc * sizeof(*(x))); \
353 } \
354 } while(0)
355
356 /* Initialize and use the cache information */
357 extern int read_index(struct index_state *);
358 extern int read_index_from(struct index_state *, const char *path);
359 extern int write_index(const struct index_state *, int newfd);
360 extern int discard_index(struct index_state *);
361 extern int unmerged_index(const struct index_state *);
362 extern int verify_path(const char *path);
363 extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
364 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
365 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
366 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
367 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
368 #define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
369 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
370 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
371 extern int remove_index_entry_at(struct index_state *, int pos);
372 extern int remove_file_from_index(struct index_state *, const char *path);
373 #define ADD_CACHE_VERBOSE 1
374 #define ADD_CACHE_PRETEND 2
375 #define ADD_CACHE_IGNORE_ERRORS 4
376 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
377 extern int add_file_to_index(struct index_state *, const char *path, int flags);
378 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
379 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
380
381 /* do stat comparison even if CE_VALID is true */
382 #define CE_MATCH_IGNORE_VALID 01
383 /* do not check the contents but report dirty on racily-clean entries */
384 #define CE_MATCH_RACY_IS_DIRTY 02
385 extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
386 extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
387
388 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
389 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
390 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
391 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
392 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
393
394 #define REFRESH_REALLY 0x0001 /* ignore_valid */
395 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
396 #define REFRESH_QUIET 0x0004 /* be quiet about it */
397 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
398 #define REFRESH_IGNORE_SUBMODULES 0x0008 /* ignore submodules */
399 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
400
401 struct lock_file {
402 struct lock_file *next;
403 int fd;
404 pid_t owner;
405 char on_list;
406 char filename[PATH_MAX];
407 };
408 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
409 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
410 extern int commit_lock_file(struct lock_file *);
411
412 extern int hold_locked_index(struct lock_file *, int);
413 extern int commit_locked_index(struct lock_file *);
414 extern void set_alternate_index_output(const char *);
415 extern int close_lock_file(struct lock_file *);
416 extern void rollback_lock_file(struct lock_file *);
417 extern int delete_ref(const char *, const unsigned char *sha1);
418
419 /* Environment bits from configuration mechanism */
420 extern int trust_executable_bit;
421 extern int quote_path_fully;
422 extern int has_symlinks;
423 extern int ignore_case;
424 extern int assume_unchanged;
425 extern int prefer_symlink_refs;
426 extern int log_all_ref_updates;
427 extern int warn_ambiguous_refs;
428 extern int shared_repository;
429 extern const char *apply_default_whitespace;
430 extern int zlib_compression_level;
431 extern int core_compression_level;
432 extern int core_compression_seen;
433 extern size_t packed_git_window_size;
434 extern size_t packed_git_limit;
435 extern size_t delta_base_cache_limit;
436 extern int auto_crlf;
437 extern int fsync_object_files;
438
439 enum safe_crlf {
440 SAFE_CRLF_FALSE = 0,
441 SAFE_CRLF_FAIL = 1,
442 SAFE_CRLF_WARN = 2,
443 };
444
445 extern enum safe_crlf safe_crlf;
446
447 enum branch_track {
448 BRANCH_TRACK_NEVER = 0,
449 BRANCH_TRACK_REMOTE,
450 BRANCH_TRACK_ALWAYS,
451 BRANCH_TRACK_EXPLICIT,
452 };
453
454 enum rebase_setup_type {
455 AUTOREBASE_NEVER = 0,
456 AUTOREBASE_LOCAL,
457 AUTOREBASE_REMOTE,
458 AUTOREBASE_ALWAYS,
459 };
460
461 extern enum branch_track git_branch_track;
462 extern enum rebase_setup_type autorebase;
463
464 #define GIT_REPO_VERSION 0
465 extern int repository_format_version;
466 extern int check_repository_format(void);
467
468 #define MTIME_CHANGED 0x0001
469 #define CTIME_CHANGED 0x0002
470 #define OWNER_CHANGED 0x0004
471 #define MODE_CHANGED 0x0008
472 #define INODE_CHANGED 0x0010
473 #define DATA_CHANGED 0x0020
474 #define TYPE_CHANGED 0x0040
475
476 /* Return a statically allocated filename matching the sha1 signature */
477 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
478 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
479 extern char *sha1_file_name(const unsigned char *sha1);
480 extern char *sha1_pack_name(const unsigned char *sha1);
481 extern char *sha1_pack_index_name(const unsigned char *sha1);
482 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
483 extern const unsigned char null_sha1[20];
484 static inline int is_null_sha1(const unsigned char *sha1)
485 {
486 return !memcmp(sha1, null_sha1, 20);
487 }
488 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
489 {
490 return memcmp(sha1, sha2, 20);
491 }
492 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
493 {
494 memcpy(sha_dst, sha_src, 20);
495 }
496 static inline void hashclr(unsigned char *hash)
497 {
498 memset(hash, 0, 20);
499 }
500
501 int git_mkstemp(char *path, size_t n, const char *template);
502
503 /*
504 * NOTE NOTE NOTE!!
505 *
506 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
507 * not be changed. Old repositories have core.sharedrepository written in
508 * numeric format, and therefore these values are preserved for compatibility
509 * reasons.
510 */
511 enum sharedrepo {
512 PERM_UMASK = 0,
513 OLD_PERM_GROUP = 1,
514 OLD_PERM_EVERYBODY = 2,
515 PERM_GROUP = 0660,
516 PERM_EVERYBODY = 0664,
517 };
518 int git_config_perm(const char *var, const char *value);
519 int adjust_shared_perm(const char *path);
520 int safe_create_leading_directories(char *path);
521 int safe_create_leading_directories_const(const char *path);
522 char *enter_repo(char *path, int strict);
523 static inline int is_absolute_path(const char *path)
524 {
525 return path[0] == '/' || has_dos_drive_prefix(path);
526 }
527 const char *make_absolute_path(const char *path);
528 const char *make_nonrelative_path(const char *path);
529 const char *make_relative_path(const char *abs, const char *base);
530 int normalize_absolute_path(char *buf, const char *path);
531 int longest_ancestor_length(const char *path, const char *prefix_list);
532
533 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
534 extern int sha1_object_info(const unsigned char *, unsigned long *);
535 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
536 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
537 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
538 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
539 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
540
541 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
542
543 extern int move_temp_to_file(const char *tmpfile, const char *filename);
544
545 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
546 extern int has_sha1_file(const unsigned char *sha1);
547
548 extern int has_pack_file(const unsigned char *sha1);
549 extern int has_pack_index(const unsigned char *sha1);
550
551 extern const signed char hexval_table[256];
552 static inline unsigned int hexval(unsigned char c)
553 {
554 return hexval_table[c];
555 }
556
557 /* Convert to/from hex/sha1 representation */
558 #define MINIMUM_ABBREV 4
559 #define DEFAULT_ABBREV 7
560
561 extern int get_sha1(const char *str, unsigned char *sha1);
562 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
563 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
564 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
565 extern int read_ref(const char *filename, unsigned char *sha1);
566 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
567 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
568 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
569
570 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
571 extern const char *ref_rev_parse_rules[];
572 extern const char *ref_fetch_rules[];
573
574 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
575 extern int validate_headref(const char *ref);
576
577 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
578 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
579 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
580
581 extern void *read_object_with_reference(const unsigned char *sha1,
582 const char *required_type,
583 unsigned long *size,
584 unsigned char *sha1_ret);
585
586 extern struct object *peel_to_type(const char *name, int namelen,
587 struct object *o, enum object_type);
588
589 enum date_mode {
590 DATE_NORMAL = 0,
591 DATE_RELATIVE,
592 DATE_SHORT,
593 DATE_LOCAL,
594 DATE_ISO8601,
595 DATE_RFC2822
596 };
597
598 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
599 int parse_date(const char *date, char *buf, int bufsize);
600 void datestamp(char *buf, int bufsize);
601 unsigned long approxidate(const char *);
602 enum date_mode parse_date_format(const char *format);
603
604 #define IDENT_WARN_ON_NO_NAME 1
605 #define IDENT_ERROR_ON_NO_NAME 2
606 #define IDENT_NO_DATE 4
607 extern const char *git_author_info(int);
608 extern const char *git_committer_info(int);
609 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
610 extern const char *fmt_name(const char *name, const char *email);
611
612 struct checkout {
613 const char *base_dir;
614 int base_dir_len;
615 unsigned force:1,
616 quiet:1,
617 not_new:1,
618 refresh_cache:1;
619 };
620
621 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
622 extern int has_symlink_leading_path(int len, const char *name);
623
624 extern struct alternate_object_database {
625 struct alternate_object_database *next;
626 char *name;
627 char base[FLEX_ARRAY]; /* more */
628 } *alt_odb_list;
629 extern void prepare_alt_odb(void);
630 extern void add_to_alternates_file(const char *reference);
631
632 struct pack_window {
633 struct pack_window *next;
634 unsigned char *base;
635 off_t offset;
636 size_t len;
637 unsigned int last_used;
638 unsigned int inuse_cnt;
639 };
640
641 extern struct packed_git {
642 struct packed_git *next;
643 struct pack_window *windows;
644 off_t pack_size;
645 const void *index_data;
646 size_t index_size;
647 uint32_t num_objects;
648 uint32_t num_bad_objects;
649 unsigned char *bad_object_sha1;
650 int index_version;
651 time_t mtime;
652 int pack_fd;
653 int pack_local;
654 unsigned char sha1[20];
655 /* something like ".git/objects/pack/xxxxx.pack" */
656 char pack_name[FLEX_ARRAY]; /* more */
657 } *packed_git;
658
659 struct pack_entry {
660 off_t offset;
661 unsigned char sha1[20];
662 struct packed_git *p;
663 };
664
665 struct ref {
666 struct ref *next;
667 unsigned char old_sha1[20];
668 unsigned char new_sha1[20];
669 char *symref;
670 unsigned int force:1,
671 merge:1,
672 nonfastforward:1,
673 deletion:1;
674 enum {
675 REF_STATUS_NONE = 0,
676 REF_STATUS_OK,
677 REF_STATUS_REJECT_NONFASTFORWARD,
678 REF_STATUS_REJECT_NODELETE,
679 REF_STATUS_UPTODATE,
680 REF_STATUS_REMOTE_REJECT,
681 REF_STATUS_EXPECTING_REPORT,
682 } status;
683 char *remote_status;
684 struct ref *peer_ref; /* when renaming */
685 char name[FLEX_ARRAY]; /* more */
686 };
687
688 #define REF_NORMAL (1u << 0)
689 #define REF_HEADS (1u << 1)
690 #define REF_TAGS (1u << 2)
691
692 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
693
694 #define CONNECT_VERBOSE (1u << 0)
695 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
696 extern int finish_connect(struct child_process *conn);
697 extern int path_match(const char *path, int nr, char **match);
698 extern int get_ack(int fd, unsigned char *result_sha1);
699 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
700 extern int server_supports(const char *feature);
701
702 extern struct packed_git *parse_pack_index(unsigned char *sha1);
703
704 extern void prepare_packed_git(void);
705 extern void reprepare_packed_git(void);
706 extern void install_packed_git(struct packed_git *pack);
707
708 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
709 struct packed_git *packs);
710
711 extern void pack_report(void);
712 extern int open_pack_index(struct packed_git *);
713 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
714 extern void close_pack_windows(struct packed_git *);
715 extern void unuse_pack(struct pack_window **);
716 extern struct packed_git *add_packed_git(const char *, int, int);
717 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
718 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
719 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
720 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
721 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
722 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
723 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
724 extern int matches_pack_name(struct packed_git *p, const char *name);
725
726 /* Dumb servers support */
727 extern int update_server_info(int);
728
729 typedef int (*config_fn_t)(const char *, const char *, void *);
730 extern int git_default_config(const char *, const char *, void *);
731 extern int git_config_from_file(config_fn_t fn, const char *, void *);
732 extern int git_config(config_fn_t fn, void *);
733 extern int git_parse_long(const char *, long *);
734 extern int git_parse_ulong(const char *, unsigned long *);
735 extern int git_config_int(const char *, const char *);
736 extern unsigned long git_config_ulong(const char *, const char *);
737 extern int git_config_bool_or_int(const char *, const char *, int *);
738 extern int git_config_bool(const char *, const char *);
739 extern int git_config_string(const char **, const char *, const char *);
740 extern int git_config_set(const char *, const char *);
741 extern int git_config_set_multivar(const char *, const char *, const char *, int);
742 extern int git_config_rename_section(const char *, const char *);
743 extern const char *git_etc_gitconfig(void);
744 extern int check_repository_format_version(const char *var, const char *value, void *cb);
745 extern int git_config_system(void);
746 extern int git_config_global(void);
747 extern int config_error_nonbool(const char *);
748 extern const char *config_exclusive_filename;
749
750 #define MAX_GITNAME (1000)
751 extern char git_default_email[MAX_GITNAME];
752 extern char git_default_name[MAX_GITNAME];
753 extern int user_ident_explicitly_given;
754
755 extern const char *git_commit_encoding;
756 extern const char *git_log_output_encoding;
757
758 /* IO helper functions */
759 extern void maybe_flush_or_die(FILE *, const char *);
760 extern int copy_fd(int ifd, int ofd);
761 extern int copy_file(const char *dst, const char *src, int mode);
762 extern ssize_t read_in_full(int fd, void *buf, size_t count);
763 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
764 extern void write_or_die(int fd, const void *buf, size_t count);
765 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
766 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
767 extern void fsync_or_die(int fd, const char *);
768
769 /* pager.c */
770 extern void setup_pager(void);
771 extern const char *pager_program;
772 extern int pager_in_use(void);
773 extern int pager_use_color;
774
775 extern const char *editor_program;
776 extern const char *excludes_file;
777
778 /* base85 */
779 int decode_85(char *dst, const char *line, int linelen);
780 void encode_85(char *buf, const unsigned char *data, int bytes);
781
782 /* alloc.c */
783 extern void *alloc_blob_node(void);
784 extern void *alloc_tree_node(void);
785 extern void *alloc_commit_node(void);
786 extern void *alloc_tag_node(void);
787 extern void *alloc_object_node(void);
788 extern void alloc_report(void);
789
790 /* trace.c */
791 extern void trace_printf(const char *format, ...);
792 extern void trace_argv_printf(const char **argv, const char *format, ...);
793
794 /* convert.c */
795 /* returns 1 if *dst was used */
796 extern int convert_to_git(const char *path, const char *src, size_t len,
797 struct strbuf *dst, enum safe_crlf checksafe);
798 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
799
800 /* add */
801 /*
802 * return 0 if success, 1 - if addition of a file failed and
803 * ADD_FILES_IGNORE_ERRORS was specified in flags
804 */
805 int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
806
807 /* diff.c */
808 extern int diff_auto_refresh_index;
809
810 /* match-trees.c */
811 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
812
813 /*
814 * whitespace rules.
815 * used by both diff and apply
816 */
817 #define WS_TRAILING_SPACE 01
818 #define WS_SPACE_BEFORE_TAB 02
819 #define WS_INDENT_WITH_NON_TAB 04
820 #define WS_CR_AT_EOL 010
821 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
822 extern unsigned whitespace_rule_cfg;
823 extern unsigned whitespace_rule(const char *);
824 extern unsigned parse_whitespace_rule(const char *);
825 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
826 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
827 extern char *whitespace_error_string(unsigned ws);
828 extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
829 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
830
831 /* ls-files */
832 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
833 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
834 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
835
836 char *alias_lookup(const char *alias);
837
838 #endif /* CACHE_H */