Make on-disk index representation separate from in-core one
[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
7 #include SHA1_HEADER
8 #include <zlib.h>
9
10 #if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
11 #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
12 #endif
13
14 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
15 #define DTYPE(de) ((de)->d_type)
16 #else
17 #undef DT_UNKNOWN
18 #undef DT_DIR
19 #undef DT_REG
20 #undef DT_LNK
21 #define DT_UNKNOWN 0
22 #define DT_DIR 1
23 #define DT_REG 2
24 #define DT_LNK 3
25 #define DTYPE(de) DT_UNKNOWN
26 #endif
27
28 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
29 #define S_IFINVALID 0030000
30
31 /*
32 * A "directory link" is a link to another git directory.
33 *
34 * The value 0160000 is not normally a valid mode, and
35 * also just happens to be S_IFDIR + S_IFLNK
36 *
37 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
38 * always having the same values everywhere. We should use
39 * our internal git values for these things, and then we can
40 * translate that to the OS-specific value. It just so
41 * happens that everybody shares the same bit representation
42 * in the UNIX world (and apparently wider too..)
43 */
44 #define S_IFGITLINK 0160000
45 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
46
47 /*
48 * Intensive research over the course of many years has shown that
49 * port 9418 is totally unused by anything else. Or
50 *
51 * Your search - "port 9418" - did not match any documents.
52 *
53 * as www.google.com puts it.
54 *
55 * This port has been properly assigned for git use by IANA:
56 * git (Assigned-9418) [I06-050728-0001].
57 *
58 * git 9418/tcp git pack transfer service
59 * git 9418/udp git pack transfer service
60 *
61 * with Linus Torvalds <torvalds@osdl.org> as the point of
62 * contact. September 2005.
63 *
64 * See http://www.iana.org/assignments/port-numbers
65 */
66 #define DEFAULT_GIT_PORT 9418
67
68 /*
69 * Basic data structures for the directory cache
70 */
71
72 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
73 struct cache_header {
74 unsigned int hdr_signature;
75 unsigned int hdr_version;
76 unsigned int hdr_entries;
77 };
78
79 /*
80 * The "cache_time" is just the low 32 bits of the
81 * time. It doesn't matter if it overflows - we only
82 * check it for equality in the 32 bits we save.
83 */
84 struct cache_time {
85 unsigned int sec;
86 unsigned int nsec;
87 };
88
89 /*
90 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
91 * Again - this is just a (very strong in practice) heuristic that
92 * the inode hasn't changed.
93 *
94 * We save the fields in big-endian order to allow using the
95 * index file over NFS transparently.
96 */
97 struct ondisk_cache_entry {
98 struct cache_time ctime;
99 struct cache_time mtime;
100 unsigned int dev;
101 unsigned int ino;
102 unsigned int mode;
103 unsigned int uid;
104 unsigned int gid;
105 unsigned int size;
106 unsigned char sha1[20];
107 unsigned short flags;
108 char name[FLEX_ARRAY]; /* more */
109 };
110
111 struct cache_entry {
112 unsigned int ce_ctime;
113 unsigned int ce_mtime;
114 unsigned int ce_dev;
115 unsigned int ce_ino;
116 unsigned int ce_mode;
117 unsigned int ce_uid;
118 unsigned int ce_gid;
119 unsigned int ce_size;
120 unsigned int ce_flags;
121 unsigned char sha1[20];
122 char name[FLEX_ARRAY]; /* more */
123 };
124
125 #define CE_NAMEMASK (0x0fff)
126 #define CE_STAGEMASK (0x3000)
127 #define CE_VALID (0x8000)
128 #define CE_STAGESHIFT 12
129
130 /* In-memory only */
131 #define CE_UPDATE (0x10000)
132 #define CE_REMOVE (0x20000)
133
134 #define create_ce_flags(len, stage) ((len) | ((stage) << CE_STAGESHIFT))
135 #define ce_namelen(ce) (CE_NAMEMASK & (ce)->ce_flags)
136 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
137 #define ondisk_ce_size(ce) ondisk_cache_entry_size(ce_namelen(ce))
138 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
139
140 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
141 static inline unsigned int create_ce_mode(unsigned int mode)
142 {
143 if (S_ISLNK(mode))
144 return S_IFLNK;
145 if (S_ISDIR(mode) || S_ISGITLINK(mode))
146 return S_IFGITLINK;
147 return S_IFREG | ce_permissions(mode);
148 }
149 static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
150 {
151 extern int trust_executable_bit, has_symlinks;
152 if (!has_symlinks && S_ISREG(mode) &&
153 ce && S_ISLNK(ce->ce_mode))
154 return ce->ce_mode;
155 if (!trust_executable_bit && S_ISREG(mode)) {
156 if (ce && S_ISREG(ce->ce_mode))
157 return ce->ce_mode;
158 return create_ce_mode(0666);
159 }
160 return create_ce_mode(mode);
161 }
162 #define canon_mode(mode) \
163 (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
164 S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
165
166 #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
167 #define ondisk_cache_entry_size(len) ((offsetof(struct ondisk_cache_entry,name) + (len) + 8) & ~7)
168
169 struct index_state {
170 struct cache_entry **cache;
171 unsigned int cache_nr, cache_alloc, cache_changed;
172 struct cache_tree *cache_tree;
173 time_t timestamp;
174 void *alloc;
175 };
176
177 extern struct index_state the_index;
178
179 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
180 #define active_cache (the_index.cache)
181 #define active_nr (the_index.cache_nr)
182 #define active_alloc (the_index.cache_alloc)
183 #define active_cache_changed (the_index.cache_changed)
184 #define active_cache_tree (the_index.cache_tree)
185
186 #define read_cache() read_index(&the_index)
187 #define read_cache_from(path) read_index_from(&the_index, (path))
188 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
189 #define discard_cache() discard_index(&the_index)
190 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
191 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
192 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
193 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
194 #define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose))
195 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
196 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
197 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
198 #endif
199
200 enum object_type {
201 OBJ_BAD = -1,
202 OBJ_NONE = 0,
203 OBJ_COMMIT = 1,
204 OBJ_TREE = 2,
205 OBJ_BLOB = 3,
206 OBJ_TAG = 4,
207 /* 5 for future expansion */
208 OBJ_OFS_DELTA = 6,
209 OBJ_REF_DELTA = 7,
210 OBJ_MAX,
211 };
212
213 static inline enum object_type object_type(unsigned int mode)
214 {
215 return S_ISDIR(mode) ? OBJ_TREE :
216 S_ISGITLINK(mode) ? OBJ_COMMIT :
217 OBJ_BLOB;
218 }
219
220 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
221 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
222 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
223 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
224 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
225 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
226 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
227 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
228 #define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL"
229 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
230 #define GITATTRIBUTES_FILE ".gitattributes"
231 #define INFOATTRIBUTES_FILE "info/attributes"
232 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
233
234 extern int is_bare_repository_cfg;
235 extern int is_bare_repository(void);
236 extern int is_inside_git_dir(void);
237 extern char *git_work_tree_cfg;
238 extern int is_inside_work_tree(void);
239 extern const char *get_git_dir(void);
240 extern char *get_object_directory(void);
241 extern char *get_refs_directory(void);
242 extern char *get_index_file(void);
243 extern char *get_graft_file(void);
244 extern int set_git_dir(const char *path);
245 extern const char *get_git_work_tree(void);
246
247 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
248
249 extern const char **get_pathspec(const char *prefix, const char **pathspec);
250 extern void setup_work_tree(void);
251 extern const char *setup_git_directory_gently(int *);
252 extern const char *setup_git_directory(void);
253 extern const char *prefix_path(const char *prefix, int len, const char *path);
254 extern const char *prefix_filename(const char *prefix, int len, const char *path);
255 extern void verify_filename(const char *prefix, const char *name);
256 extern void verify_non_filename(const char *prefix, const char *name);
257
258 #define alloc_nr(x) (((x)+16)*3/2)
259
260 /*
261 * Realloc the buffer pointed at by variable 'x' so that it can hold
262 * at least 'nr' entries; the number of entries currently allocated
263 * is 'alloc', using the standard growing factor alloc_nr() macro.
264 *
265 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
266 */
267 #define ALLOC_GROW(x, nr, alloc) \
268 do { \
269 if ((nr) > alloc) { \
270 if (alloc_nr(alloc) < (nr)) \
271 alloc = (nr); \
272 else \
273 alloc = alloc_nr(alloc); \
274 x = xrealloc((x), alloc * sizeof(*(x))); \
275 } \
276 } while(0)
277
278 /* Initialize and use the cache information */
279 extern int read_index(struct index_state *);
280 extern int read_index_from(struct index_state *, const char *path);
281 extern int write_index(struct index_state *, int newfd);
282 extern int discard_index(struct index_state *);
283 extern int verify_path(const char *path);
284 extern int index_name_pos(struct index_state *, const char *name, int namelen);
285 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
286 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
287 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
288 #define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
289 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
290 extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
291 extern int remove_index_entry_at(struct index_state *, int pos);
292 extern int remove_file_from_index(struct index_state *, const char *path);
293 extern int add_file_to_index(struct index_state *, const char *path, int verbose);
294 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
295 extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
296
297 /* do stat comparison even if CE_VALID is true */
298 #define CE_MATCH_IGNORE_VALID 01
299 /* do not check the contents but report dirty on racily-clean entries */
300 #define CE_MATCH_RACY_IS_DIRTY 02
301 extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
302 extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, unsigned int);
303
304 extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
305 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
306 extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
307 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
308 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
309
310 #define REFRESH_REALLY 0x0001 /* ignore_valid */
311 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
312 #define REFRESH_QUIET 0x0004 /* be quiet about it */
313 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
314 extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
315
316 struct lock_file {
317 struct lock_file *next;
318 int fd;
319 pid_t owner;
320 char on_list;
321 char filename[PATH_MAX];
322 };
323 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
324 extern int commit_lock_file(struct lock_file *);
325
326 extern int hold_locked_index(struct lock_file *, int);
327 extern int commit_locked_index(struct lock_file *);
328 extern void set_alternate_index_output(const char *);
329 extern int close_lock_file(struct lock_file *);
330 extern void rollback_lock_file(struct lock_file *);
331 extern int delete_ref(const char *, const unsigned char *sha1);
332
333 /* Environment bits from configuration mechanism */
334 extern int trust_executable_bit;
335 extern int quote_path_fully;
336 extern int has_symlinks;
337 extern int assume_unchanged;
338 extern int prefer_symlink_refs;
339 extern int log_all_ref_updates;
340 extern int warn_ambiguous_refs;
341 extern int shared_repository;
342 extern const char *apply_default_whitespace;
343 extern int zlib_compression_level;
344 extern int core_compression_level;
345 extern int core_compression_seen;
346 extern size_t packed_git_window_size;
347 extern size_t packed_git_limit;
348 extern size_t delta_base_cache_limit;
349 extern int auto_crlf;
350
351 #define GIT_REPO_VERSION 0
352 extern int repository_format_version;
353 extern int check_repository_format(void);
354
355 #define MTIME_CHANGED 0x0001
356 #define CTIME_CHANGED 0x0002
357 #define OWNER_CHANGED 0x0004
358 #define MODE_CHANGED 0x0008
359 #define INODE_CHANGED 0x0010
360 #define DATA_CHANGED 0x0020
361 #define TYPE_CHANGED 0x0040
362
363 /* Return a statically allocated filename matching the sha1 signature */
364 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
365 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
366 extern char *sha1_file_name(const unsigned char *sha1);
367 extern char *sha1_pack_name(const unsigned char *sha1);
368 extern char *sha1_pack_index_name(const unsigned char *sha1);
369 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
370 extern const unsigned char null_sha1[20];
371 static inline int is_null_sha1(const unsigned char *sha1)
372 {
373 return !memcmp(sha1, null_sha1, 20);
374 }
375 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
376 {
377 return memcmp(sha1, sha2, 20);
378 }
379 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
380 {
381 memcpy(sha_dst, sha_src, 20);
382 }
383 static inline void hashclr(unsigned char *hash)
384 {
385 memset(hash, 0, 20);
386 }
387
388 int git_mkstemp(char *path, size_t n, const char *template);
389
390 enum sharedrepo {
391 PERM_UMASK = 0,
392 PERM_GROUP,
393 PERM_EVERYBODY
394 };
395 int git_config_perm(const char *var, const char *value);
396 int adjust_shared_perm(const char *path);
397 int safe_create_leading_directories(char *path);
398 char *enter_repo(char *path, int strict);
399 static inline int is_absolute_path(const char *path)
400 {
401 return path[0] == '/';
402 }
403 const char *make_absolute_path(const char *path);
404
405 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
406 extern int sha1_object_info(const unsigned char *, unsigned long *);
407 extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
408 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
409 extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
410 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
411
412 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
413
414 extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
415 size_t bufsize, size_t *bufposn);
416 extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
417 extern int move_temp_to_file(const char *tmpfile, const char *filename);
418
419 extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
420 extern int has_sha1_file(const unsigned char *sha1);
421
422 extern int has_pack_file(const unsigned char *sha1);
423 extern int has_pack_index(const unsigned char *sha1);
424
425 extern const signed char hexval_table[256];
426 static inline unsigned int hexval(unsigned char c)
427 {
428 return hexval_table[c];
429 }
430
431 /* Convert to/from hex/sha1 representation */
432 #define MINIMUM_ABBREV 4
433 #define DEFAULT_ABBREV 7
434
435 extern int get_sha1(const char *str, unsigned char *sha1);
436 extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
437 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
438 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
439 extern int read_ref(const char *filename, unsigned char *sha1);
440 extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
441 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
442 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
443
444 extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
445 extern const char *ref_rev_parse_rules[];
446 extern const char *ref_fetch_rules[];
447
448 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
449 extern int validate_headref(const char *ref);
450
451 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
452 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
453
454 extern void *read_object_with_reference(const unsigned char *sha1,
455 const char *required_type,
456 unsigned long *size,
457 unsigned char *sha1_ret);
458
459 enum date_mode {
460 DATE_NORMAL = 0,
461 DATE_RELATIVE,
462 DATE_SHORT,
463 DATE_LOCAL,
464 DATE_ISO8601,
465 DATE_RFC2822
466 };
467
468 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
469 int parse_date(const char *date, char *buf, int bufsize);
470 void datestamp(char *buf, int bufsize);
471 unsigned long approxidate(const char *);
472 enum date_mode parse_date_format(const char *format);
473
474 #define IDENT_WARN_ON_NO_NAME 1
475 #define IDENT_ERROR_ON_NO_NAME 2
476 #define IDENT_NO_DATE 4
477 extern const char *git_author_info(int);
478 extern const char *git_committer_info(int);
479 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
480 extern const char *fmt_name(const char *name, const char *email);
481
482 struct checkout {
483 const char *base_dir;
484 int base_dir_len;
485 unsigned force:1,
486 quiet:1,
487 not_new:1,
488 refresh_cache:1;
489 };
490
491 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
492 extern int has_symlink_leading_path(const char *name, char *last_symlink);
493
494 extern struct alternate_object_database {
495 struct alternate_object_database *next;
496 char *name;
497 char base[FLEX_ARRAY]; /* more */
498 } *alt_odb_list;
499 extern void prepare_alt_odb(void);
500
501 struct pack_window {
502 struct pack_window *next;
503 unsigned char *base;
504 off_t offset;
505 size_t len;
506 unsigned int last_used;
507 unsigned int inuse_cnt;
508 };
509
510 extern struct packed_git {
511 struct packed_git *next;
512 struct pack_window *windows;
513 off_t pack_size;
514 const void *index_data;
515 size_t index_size;
516 uint32_t num_objects;
517 int index_version;
518 time_t mtime;
519 int pack_fd;
520 int pack_local;
521 unsigned char sha1[20];
522 /* something like ".git/objects/pack/xxxxx.pack" */
523 char pack_name[FLEX_ARRAY]; /* more */
524 } *packed_git;
525
526 struct pack_entry {
527 off_t offset;
528 unsigned char sha1[20];
529 struct packed_git *p;
530 };
531
532 struct ref {
533 struct ref *next;
534 unsigned char old_sha1[20];
535 unsigned char new_sha1[20];
536 unsigned int force:1,
537 merge:1,
538 nonfastforward:1,
539 deletion:1;
540 enum {
541 REF_STATUS_NONE = 0,
542 REF_STATUS_OK,
543 REF_STATUS_REJECT_NONFASTFORWARD,
544 REF_STATUS_REJECT_NODELETE,
545 REF_STATUS_UPTODATE,
546 REF_STATUS_REMOTE_REJECT,
547 REF_STATUS_EXPECTING_REPORT,
548 } status;
549 char *remote_status;
550 struct ref *peer_ref; /* when renaming */
551 char name[FLEX_ARRAY]; /* more */
552 };
553
554 #define REF_NORMAL (1u << 0)
555 #define REF_HEADS (1u << 1)
556 #define REF_TAGS (1u << 2)
557
558 extern struct ref *find_ref_by_name(struct ref *list, const char *name);
559
560 #define CONNECT_VERBOSE (1u << 0)
561 extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
562 extern int finish_connect(struct child_process *conn);
563 extern int path_match(const char *path, int nr, char **match);
564 extern int get_ack(int fd, unsigned char *result_sha1);
565 extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags);
566 extern int server_supports(const char *feature);
567
568 extern struct packed_git *parse_pack_index(unsigned char *sha1);
569 extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
570 const char *idx_path);
571
572 extern void prepare_packed_git(void);
573 extern void reprepare_packed_git(void);
574 extern void install_packed_git(struct packed_git *pack);
575
576 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
577 struct packed_git *packs);
578
579 extern void pack_report(void);
580 extern int open_pack_index(struct packed_git *);
581 extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
582 extern void close_pack_windows(struct packed_git *);
583 extern void unuse_pack(struct pack_window **);
584 extern struct packed_git *add_packed_git(const char *, int, int);
585 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
586 extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
587 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
588 extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
589 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
590 extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
591 extern int matches_pack_name(struct packed_git *p, const char *name);
592
593 /* Dumb servers support */
594 extern int update_server_info(int);
595
596 typedef int (*config_fn_t)(const char *, const char *);
597 extern int git_default_config(const char *, const char *);
598 extern int git_config_from_file(config_fn_t fn, const char *);
599 extern int git_config(config_fn_t fn);
600 extern int git_parse_long(const char *, long *);
601 extern int git_parse_ulong(const char *, unsigned long *);
602 extern int git_config_int(const char *, const char *);
603 extern unsigned long git_config_ulong(const char *, const char *);
604 extern int git_config_bool(const char *, const char *);
605 extern int git_config_set(const char *, const char *);
606 extern int git_config_set_multivar(const char *, const char *, const char *, int);
607 extern int git_config_rename_section(const char *, const char *);
608 extern const char *git_etc_gitconfig(void);
609 extern int check_repository_format_version(const char *var, const char *value);
610
611 #define MAX_GITNAME (1000)
612 extern char git_default_email[MAX_GITNAME];
613 extern char git_default_name[MAX_GITNAME];
614
615 extern const char *git_commit_encoding;
616 extern const char *git_log_output_encoding;
617
618 /* IO helper functions */
619 extern void maybe_flush_or_die(FILE *, const char *);
620 extern int copy_fd(int ifd, int ofd);
621 extern int read_in_full(int fd, void *buf, size_t count);
622 extern int write_in_full(int fd, const void *buf, size_t count);
623 extern void write_or_die(int fd, const void *buf, size_t count);
624 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
625 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
626
627 /* pager.c */
628 extern void setup_pager(void);
629 extern char *pager_program;
630 extern int pager_in_use(void);
631 extern int pager_use_color;
632
633 extern char *editor_program;
634 extern char *excludes_file;
635
636 /* base85 */
637 int decode_85(char *dst, const char *line, int linelen);
638 void encode_85(char *buf, const unsigned char *data, int bytes);
639
640 /* alloc.c */
641 extern void *alloc_blob_node(void);
642 extern void *alloc_tree_node(void);
643 extern void *alloc_commit_node(void);
644 extern void *alloc_tag_node(void);
645 extern void *alloc_object_node(void);
646 extern void alloc_report(void);
647
648 /* trace.c */
649 extern void trace_printf(const char *format, ...);
650 extern void trace_argv_printf(const char **argv, const char *format, ...);
651
652 /* convert.c */
653 /* returns 1 if *dst was used */
654 extern int convert_to_git(const char *path, const char *src, size_t len, struct strbuf *dst);
655 extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
656
657 /* add */
658 void add_files_to_cache(int verbose, const char *prefix, const char **pathspec);
659
660 /* diff.c */
661 extern int diff_auto_refresh_index;
662
663 /* match-trees.c */
664 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
665
666 /*
667 * whitespace rules.
668 * used by both diff and apply
669 */
670 #define WS_TRAILING_SPACE 01
671 #define WS_SPACE_BEFORE_TAB 02
672 #define WS_INDENT_WITH_NON_TAB 04
673 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
674 extern unsigned whitespace_rule_cfg;
675 extern unsigned whitespace_rule(const char *);
676 extern unsigned parse_whitespace_rule(const char *);
677 extern unsigned check_and_emit_line(const char *line, int len, unsigned ws_rule,
678 FILE *stream, const char *set,
679 const char *reset, const char *ws);
680 extern char *whitespace_error_string(unsigned ws);
681
682 /* ls-files */
683 int pathspec_match(const char **spec, char *matched, const char *filename, int skiplen);
684 int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
685 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
686
687 #endif /* CACHE_H */