pack-revindex: store entries directly in packed_git
[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 "hashmap.h"
7 #include "advice.h"
8 #include "gettext.h"
9 #include "convert.h"
10 #include "pack-revindex.h"
11
12 #include SHA1_HEADER
13 #ifndef git_SHA_CTX
14 #define git_SHA_CTX SHA_CTX
15 #define git_SHA1_Init SHA1_Init
16 #define git_SHA1_Update SHA1_Update
17 #define git_SHA1_Final SHA1_Final
18 #endif
19
20 #include <zlib.h>
21 typedef struct git_zstream {
22 z_stream z;
23 unsigned long avail_in;
24 unsigned long avail_out;
25 unsigned long total_in;
26 unsigned long total_out;
27 unsigned char *next_in;
28 unsigned char *next_out;
29 } git_zstream;
30
31 void git_inflate_init(git_zstream *);
32 void git_inflate_init_gzip_only(git_zstream *);
33 void git_inflate_end(git_zstream *);
34 int git_inflate(git_zstream *, int flush);
35
36 void git_deflate_init(git_zstream *, int level);
37 void git_deflate_init_gzip(git_zstream *, int level);
38 void git_deflate_init_raw(git_zstream *, int level);
39 void git_deflate_end(git_zstream *);
40 int git_deflate_abort(git_zstream *);
41 int git_deflate_end_gently(git_zstream *);
42 int git_deflate(git_zstream *, int flush);
43 unsigned long git_deflate_bound(git_zstream *, unsigned long);
44
45 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
46 #define DTYPE(de) ((de)->d_type)
47 #else
48 #undef DT_UNKNOWN
49 #undef DT_DIR
50 #undef DT_REG
51 #undef DT_LNK
52 #define DT_UNKNOWN 0
53 #define DT_DIR 1
54 #define DT_REG 2
55 #define DT_LNK 3
56 #define DTYPE(de) DT_UNKNOWN
57 #endif
58
59 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
60 #define S_IFINVALID 0030000
61
62 /*
63 * A "directory link" is a link to another git directory.
64 *
65 * The value 0160000 is not normally a valid mode, and
66 * also just happens to be S_IFDIR + S_IFLNK
67 *
68 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
69 * always having the same values everywhere. We should use
70 * our internal git values for these things, and then we can
71 * translate that to the OS-specific value. It just so
72 * happens that everybody shares the same bit representation
73 * in the UNIX world (and apparently wider too..)
74 */
75 #define S_IFGITLINK 0160000
76 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
77
78 /*
79 * Intensive research over the course of many years has shown that
80 * port 9418 is totally unused by anything else. Or
81 *
82 * Your search - "port 9418" - did not match any documents.
83 *
84 * as www.google.com puts it.
85 *
86 * This port has been properly assigned for git use by IANA:
87 * git (Assigned-9418) [I06-050728-0001].
88 *
89 * git 9418/tcp git pack transfer service
90 * git 9418/udp git pack transfer service
91 *
92 * with Linus Torvalds <torvalds@osdl.org> as the point of
93 * contact. September 2005.
94 *
95 * See http://www.iana.org/assignments/port-numbers
96 */
97 #define DEFAULT_GIT_PORT 9418
98
99 /*
100 * Basic data structures for the directory cache
101 */
102
103 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
104 struct cache_header {
105 uint32_t hdr_signature;
106 uint32_t hdr_version;
107 uint32_t hdr_entries;
108 };
109
110 #define INDEX_FORMAT_LB 2
111 #define INDEX_FORMAT_UB 4
112
113 /*
114 * The "cache_time" is just the low 32 bits of the
115 * time. It doesn't matter if it overflows - we only
116 * check it for equality in the 32 bits we save.
117 */
118 struct cache_time {
119 uint32_t sec;
120 uint32_t nsec;
121 };
122
123 struct stat_data {
124 struct cache_time sd_ctime;
125 struct cache_time sd_mtime;
126 unsigned int sd_dev;
127 unsigned int sd_ino;
128 unsigned int sd_uid;
129 unsigned int sd_gid;
130 unsigned int sd_size;
131 };
132
133 struct cache_entry {
134 struct hashmap_entry ent;
135 struct stat_data ce_stat_data;
136 unsigned int ce_mode;
137 unsigned int ce_flags;
138 unsigned int ce_namelen;
139 unsigned char sha1[20];
140 char name[FLEX_ARRAY]; /* more */
141 };
142
143 #define CE_STAGEMASK (0x3000)
144 #define CE_EXTENDED (0x4000)
145 #define CE_VALID (0x8000)
146 #define CE_STAGESHIFT 12
147
148 /*
149 * Range 0xFFFF0000 in ce_flags is divided into
150 * two parts: in-memory flags and on-disk ones.
151 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
152 * if you want to save a new flag, add it in
153 * CE_EXTENDED_FLAGS
154 *
155 * In-memory only flags
156 */
157 #define CE_UPDATE (1 << 16)
158 #define CE_REMOVE (1 << 17)
159 #define CE_UPTODATE (1 << 18)
160 #define CE_ADDED (1 << 19)
161
162 #define CE_HASHED (1 << 20)
163 #define CE_WT_REMOVE (1 << 22) /* remove in work directory */
164 #define CE_CONFLICTED (1 << 23)
165
166 #define CE_UNPACKED (1 << 24)
167 #define CE_NEW_SKIP_WORKTREE (1 << 25)
168
169 /* used to temporarily mark paths matched by pathspecs */
170 #define CE_MATCHED (1 << 26)
171
172 /*
173 * Extended on-disk flags
174 */
175 #define CE_INTENT_TO_ADD (1 << 29)
176 #define CE_SKIP_WORKTREE (1 << 30)
177 /* CE_EXTENDED2 is for future extension */
178 #define CE_EXTENDED2 (1 << 31)
179
180 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
181
182 /*
183 * Safeguard to avoid saving wrong flags:
184 * - CE_EXTENDED2 won't get saved until its semantic is known
185 * - Bits in 0x0000FFFF have been saved in ce_flags already
186 * - Bits in 0x003F0000 are currently in-memory flags
187 */
188 #if CE_EXTENDED_FLAGS & 0x803FFFFF
189 #error "CE_EXTENDED_FLAGS out of range"
190 #endif
191
192 struct pathspec;
193
194 /*
195 * Copy the sha1 and stat state of a cache entry from one to
196 * another. But we never change the name, or the hash state!
197 */
198 static inline void copy_cache_entry(struct cache_entry *dst,
199 const struct cache_entry *src)
200 {
201 unsigned int state = dst->ce_flags & CE_HASHED;
202
203 /* Don't copy hash chain and name */
204 memcpy(&dst->ce_stat_data, &src->ce_stat_data,
205 offsetof(struct cache_entry, name) -
206 offsetof(struct cache_entry, ce_stat_data));
207
208 /* Restore the hash state */
209 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
210 }
211
212 static inline unsigned create_ce_flags(unsigned stage)
213 {
214 return (stage << CE_STAGESHIFT);
215 }
216
217 #define ce_namelen(ce) ((ce)->ce_namelen)
218 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
219 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
220 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
221 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
222 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
223
224 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
225 static inline unsigned int create_ce_mode(unsigned int mode)
226 {
227 if (S_ISLNK(mode))
228 return S_IFLNK;
229 if (S_ISDIR(mode) || S_ISGITLINK(mode))
230 return S_IFGITLINK;
231 return S_IFREG | ce_permissions(mode);
232 }
233 static inline unsigned int ce_mode_from_stat(const struct cache_entry *ce,
234 unsigned int mode)
235 {
236 extern int trust_executable_bit, has_symlinks;
237 if (!has_symlinks && S_ISREG(mode) &&
238 ce && S_ISLNK(ce->ce_mode))
239 return ce->ce_mode;
240 if (!trust_executable_bit && S_ISREG(mode)) {
241 if (ce && S_ISREG(ce->ce_mode))
242 return ce->ce_mode;
243 return create_ce_mode(0666);
244 }
245 return create_ce_mode(mode);
246 }
247 static inline int ce_to_dtype(const struct cache_entry *ce)
248 {
249 unsigned ce_mode = ntohl(ce->ce_mode);
250 if (S_ISREG(ce_mode))
251 return DT_REG;
252 else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
253 return DT_DIR;
254 else if (S_ISLNK(ce_mode))
255 return DT_LNK;
256 else
257 return DT_UNKNOWN;
258 }
259 static inline unsigned int canon_mode(unsigned int mode)
260 {
261 if (S_ISREG(mode))
262 return S_IFREG | ce_permissions(mode);
263 if (S_ISLNK(mode))
264 return S_IFLNK;
265 if (S_ISDIR(mode))
266 return S_IFDIR;
267 return S_IFGITLINK;
268 }
269
270 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
271
272 struct index_state {
273 struct cache_entry **cache;
274 unsigned int version;
275 unsigned int cache_nr, cache_alloc, cache_changed;
276 struct string_list *resolve_undo;
277 struct cache_tree *cache_tree;
278 struct cache_time timestamp;
279 unsigned name_hash_initialized : 1,
280 initialized : 1;
281 struct hashmap name_hash;
282 struct hashmap dir_hash;
283 };
284
285 extern struct index_state the_index;
286
287 /* Name hashing */
288 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
289 extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
290 extern void free_name_hash(struct index_state *istate);
291
292
293 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
294 #define active_cache (the_index.cache)
295 #define active_nr (the_index.cache_nr)
296 #define active_alloc (the_index.cache_alloc)
297 #define active_cache_changed (the_index.cache_changed)
298 #define active_cache_tree (the_index.cache_tree)
299
300 #define read_cache() read_index(&the_index)
301 #define read_cache_from(path) read_index_from(&the_index, (path))
302 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
303 #define is_cache_unborn() is_index_unborn(&the_index)
304 #define read_cache_unmerged() read_index_unmerged(&the_index)
305 #define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
306 #define discard_cache() discard_index(&the_index)
307 #define unmerged_cache() unmerged_index(&the_index)
308 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
309 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
310 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
311 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
312 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
313 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
314 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
315 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
316 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
317 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
318 #define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
319 #define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
320 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
321 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
322 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
323 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
324 #define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
325 #endif
326
327 enum object_type {
328 OBJ_BAD = -1,
329 OBJ_NONE = 0,
330 OBJ_COMMIT = 1,
331 OBJ_TREE = 2,
332 OBJ_BLOB = 3,
333 OBJ_TAG = 4,
334 /* 5 for future expansion */
335 OBJ_OFS_DELTA = 6,
336 OBJ_REF_DELTA = 7,
337 OBJ_ANY,
338 OBJ_MAX
339 };
340
341 static inline enum object_type object_type(unsigned int mode)
342 {
343 return S_ISDIR(mode) ? OBJ_TREE :
344 S_ISGITLINK(mode) ? OBJ_COMMIT :
345 OBJ_BLOB;
346 }
347
348 /* Double-check local_repo_env below if you add to this list. */
349 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
350 #define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
351 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
352 #define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
353 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
354 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
355 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
356 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
357 #define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
358 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
359 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
360 #define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
361 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
362 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
363 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
364 #define GITATTRIBUTES_FILE ".gitattributes"
365 #define INFOATTRIBUTES_FILE "info/attributes"
366 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
367 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
368 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
369 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
370 #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
371 #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
372 #define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
373 #define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
374 #define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
375 #define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
376
377 /*
378 * This environment variable is expected to contain a boolean indicating
379 * whether we should or should not treat:
380 *
381 * GIT_DIR=foo.git git ...
382 *
383 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use
384 * of this, but we use it internally to communicate to sub-processes that we
385 * are in a bare repo. If not set, defaults to true.
386 */
387 #define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
388
389 /*
390 * Repository-local GIT_* environment variables; these will be cleared
391 * when git spawns a sub-process that runs inside another repository.
392 * The array is NULL-terminated, which makes it easy to pass in the "env"
393 * parameter of a run-command invocation, or to do a simple walk.
394 */
395 extern const char * const local_repo_env[];
396
397 extern int is_bare_repository_cfg;
398 extern int is_bare_repository(void);
399 extern int is_inside_git_dir(void);
400 extern char *git_work_tree_cfg;
401 extern int is_inside_work_tree(void);
402 extern const char *get_git_dir(void);
403 extern int is_git_directory(const char *path);
404 extern char *get_object_directory(void);
405 extern char *get_index_file(void);
406 extern char *get_graft_file(void);
407 extern int set_git_dir(const char *path);
408 extern const char *get_git_namespace(void);
409 extern const char *strip_namespace(const char *namespaced_ref);
410 extern const char *get_git_work_tree(void);
411 extern const char *read_gitfile(const char *path);
412 extern const char *resolve_gitdir(const char *suspect);
413 extern void set_git_work_tree(const char *tree);
414
415 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
416
417 extern const char **get_pathspec(const char *prefix, const char **pathspec);
418 extern void setup_work_tree(void);
419 extern const char *setup_git_directory_gently(int *);
420 extern const char *setup_git_directory(void);
421 extern char *prefix_path(const char *prefix, int len, const char *path);
422 extern char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
423 extern const char *prefix_filename(const char *prefix, int len, const char *path);
424 extern int check_filename(const char *prefix, const char *name);
425 extern void verify_filename(const char *prefix,
426 const char *name,
427 int diagnose_misspelt_rev);
428 extern void verify_non_filename(const char *prefix, const char *name);
429 extern int path_inside_repo(const char *prefix, const char *path);
430
431 #define INIT_DB_QUIET 0x0001
432
433 extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
434 extern int init_db(const char *template_dir, unsigned int flags);
435
436 extern void sanitize_stdfds(void);
437 extern int daemonize(void);
438
439 #define alloc_nr(x) (((x)+16)*3/2)
440
441 /*
442 * Realloc the buffer pointed at by variable 'x' so that it can hold
443 * at least 'nr' entries; the number of entries currently allocated
444 * is 'alloc', using the standard growing factor alloc_nr() macro.
445 *
446 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
447 */
448 #define ALLOC_GROW(x, nr, alloc) \
449 do { \
450 if ((nr) > alloc) { \
451 if (alloc_nr(alloc) < (nr)) \
452 alloc = (nr); \
453 else \
454 alloc = alloc_nr(alloc); \
455 x = xrealloc((x), alloc * sizeof(*(x))); \
456 } \
457 } while (0)
458
459 /* Initialize and use the cache information */
460 extern int read_index(struct index_state *);
461 extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
462 extern int read_index_from(struct index_state *, const char *path);
463 extern int is_index_unborn(struct index_state *);
464 extern int read_index_unmerged(struct index_state *);
465 extern int write_index(struct index_state *, int newfd);
466 extern int discard_index(struct index_state *);
467 extern int unmerged_index(const struct index_state *);
468 extern int verify_path(const char *path);
469 extern struct cache_entry *index_dir_exists(struct index_state *istate, const char *name, int namelen);
470 extern struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
471 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
472 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
473 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
474 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
475 #define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
476 #define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
477 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
478 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
479 extern int remove_index_entry_at(struct index_state *, int pos);
480 extern void remove_marked_cache_entries(struct index_state *istate);
481 extern int remove_file_from_index(struct index_state *, const char *path);
482 #define ADD_CACHE_VERBOSE 1
483 #define ADD_CACHE_PRETEND 2
484 #define ADD_CACHE_IGNORE_ERRORS 4
485 #define ADD_CACHE_IGNORE_REMOVAL 8
486 #define ADD_CACHE_INTENT 16
487 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
488 extern int add_file_to_index(struct index_state *, const char *path, int flags);
489 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, unsigned int refresh_options);
490 extern int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
491 extern void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
492 extern int index_name_is_other(const struct index_state *, const char *, int);
493 extern void *read_blob_data_from_index(struct index_state *, const char *, unsigned long *);
494
495 /* do stat comparison even if CE_VALID is true */
496 #define CE_MATCH_IGNORE_VALID 01
497 /* do not check the contents but report dirty on racily-clean entries */
498 #define CE_MATCH_RACY_IS_DIRTY 02
499 /* do stat comparison even if CE_SKIP_WORKTREE is true */
500 #define CE_MATCH_IGNORE_SKIP_WORKTREE 04
501 /* ignore non-existent files during stat update */
502 #define CE_MATCH_IGNORE_MISSING 0x08
503 /* enable stat refresh */
504 #define CE_MATCH_REFRESH 0x10
505 extern int ie_match_stat(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
506 extern int ie_modified(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
507
508 #define HASH_WRITE_OBJECT 1
509 #define HASH_FORMAT_CHECK 2
510 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
511 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
512
513 /*
514 * Record to sd the data from st that we use to check whether a file
515 * might have changed.
516 */
517 extern void fill_stat_data(struct stat_data *sd, struct stat *st);
518
519 /*
520 * Return 0 if st is consistent with a file not having been changed
521 * since sd was filled. If there are differences, return a
522 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
523 * INODE_CHANGED, and DATA_CHANGED.
524 */
525 extern int match_stat_data(const struct stat_data *sd, struct stat *st);
526
527 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
528
529 #define REFRESH_REALLY 0x0001 /* ignore_valid */
530 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
531 #define REFRESH_QUIET 0x0004 /* be quiet about it */
532 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
533 #define REFRESH_IGNORE_SUBMODULES 0x0010 /* ignore submodules */
534 #define REFRESH_IN_PORCELAIN 0x0020 /* user friendly output, not "needs update" */
535 extern int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
536
537 struct lock_file {
538 struct lock_file *next;
539 int fd;
540 pid_t owner;
541 char on_list;
542 char filename[PATH_MAX];
543 };
544 #define LOCK_DIE_ON_ERROR 1
545 #define LOCK_NODEREF 2
546 extern int unable_to_lock_error(const char *path, int err);
547 extern NORETURN void unable_to_lock_index_die(const char *path, int err);
548 extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
549 extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
550 extern int commit_lock_file(struct lock_file *);
551 extern void update_index_if_able(struct index_state *, struct lock_file *);
552
553 extern int hold_locked_index(struct lock_file *, int);
554 extern int commit_locked_index(struct lock_file *);
555 extern void set_alternate_index_output(const char *);
556 extern int close_lock_file(struct lock_file *);
557 extern void rollback_lock_file(struct lock_file *);
558 extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
559
560 /* Environment bits from configuration mechanism */
561 extern int trust_executable_bit;
562 extern int trust_ctime;
563 extern int check_stat;
564 extern int quote_path_fully;
565 extern int has_symlinks;
566 extern int minimum_abbrev, default_abbrev;
567 extern int ignore_case;
568 extern int assume_unchanged;
569 extern int prefer_symlink_refs;
570 extern int log_all_ref_updates;
571 extern int warn_ambiguous_refs;
572 extern int warn_on_object_refname_ambiguity;
573 extern int shared_repository;
574 extern const char *apply_default_whitespace;
575 extern const char *apply_default_ignorewhitespace;
576 extern const char *git_attributes_file;
577 extern int zlib_compression_level;
578 extern int core_compression_level;
579 extern int core_compression_seen;
580 extern size_t packed_git_window_size;
581 extern size_t packed_git_limit;
582 extern size_t delta_base_cache_limit;
583 extern unsigned long big_file_threshold;
584 extern unsigned long pack_size_limit_cfg;
585
586 /*
587 * Do replace refs need to be checked this run? This variable is
588 * initialized to true unless --no-replace-object is used or
589 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
590 * commands that do not want replace references to be active. As an
591 * optimization it is also set to false if replace references have
592 * been sought but there were none.
593 */
594 extern int check_replace_refs;
595
596 extern int fsync_object_files;
597 extern int core_preload_index;
598 extern int core_apply_sparse_checkout;
599 extern int precomposed_unicode;
600
601 /*
602 * The character that begins a commented line in user-editable file
603 * that is subject to stripspace.
604 */
605 extern char comment_line_char;
606
607 enum branch_track {
608 BRANCH_TRACK_UNSPECIFIED = -1,
609 BRANCH_TRACK_NEVER = 0,
610 BRANCH_TRACK_REMOTE,
611 BRANCH_TRACK_ALWAYS,
612 BRANCH_TRACK_EXPLICIT,
613 BRANCH_TRACK_OVERRIDE
614 };
615
616 enum rebase_setup_type {
617 AUTOREBASE_NEVER = 0,
618 AUTOREBASE_LOCAL,
619 AUTOREBASE_REMOTE,
620 AUTOREBASE_ALWAYS
621 };
622
623 enum push_default_type {
624 PUSH_DEFAULT_NOTHING = 0,
625 PUSH_DEFAULT_MATCHING,
626 PUSH_DEFAULT_SIMPLE,
627 PUSH_DEFAULT_UPSTREAM,
628 PUSH_DEFAULT_CURRENT,
629 PUSH_DEFAULT_UNSPECIFIED
630 };
631
632 extern enum branch_track git_branch_track;
633 extern enum rebase_setup_type autorebase;
634 extern enum push_default_type push_default;
635
636 enum object_creation_mode {
637 OBJECT_CREATION_USES_HARDLINKS = 0,
638 OBJECT_CREATION_USES_RENAMES = 1
639 };
640
641 extern enum object_creation_mode object_creation_mode;
642
643 extern char *notes_ref_name;
644
645 extern int grafts_replace_parents;
646
647 #define GIT_REPO_VERSION 0
648 extern int repository_format_version;
649 extern int check_repository_format(void);
650
651 #define MTIME_CHANGED 0x0001
652 #define CTIME_CHANGED 0x0002
653 #define OWNER_CHANGED 0x0004
654 #define MODE_CHANGED 0x0008
655 #define INODE_CHANGED 0x0010
656 #define DATA_CHANGED 0x0020
657 #define TYPE_CHANGED 0x0040
658
659 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
660 __attribute__((format (printf, 3, 4)));
661 extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
662 __attribute__((format (printf, 3, 4)));
663 extern char *git_pathdup(const char *fmt, ...)
664 __attribute__((format (printf, 1, 2)));
665 extern char *mkpathdup(const char *fmt, ...)
666 __attribute__((format (printf, 1, 2)));
667
668 /* Return a statically allocated filename matching the sha1 signature */
669 extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
670 extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
671 extern char *git_path_submodule(const char *path, const char *fmt, ...)
672 __attribute__((format (printf, 2, 3)));
673
674 /*
675 * Return the name of the file in the local object database that would
676 * be used to store a loose object with the specified sha1. The
677 * return value is a pointer to a statically allocated buffer that is
678 * overwritten each time the function is called.
679 */
680 extern const char *sha1_file_name(const unsigned char *sha1);
681
682 /*
683 * Return the name of the (local) packfile with the specified sha1 in
684 * its name. The return value is a pointer to memory that is
685 * overwritten each time this function is called.
686 */
687 extern char *sha1_pack_name(const unsigned char *sha1);
688
689 /*
690 * Return the name of the (local) pack index file with the specified
691 * sha1 in its name. The return value is a pointer to memory that is
692 * overwritten each time this function is called.
693 */
694 extern char *sha1_pack_index_name(const unsigned char *sha1);
695
696 extern const char *find_unique_abbrev(const unsigned char *sha1, int);
697 extern const unsigned char null_sha1[20];
698
699 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
700 {
701 int i;
702
703 for (i = 0; i < 20; i++, sha1++, sha2++) {
704 if (*sha1 != *sha2)
705 return *sha1 - *sha2;
706 }
707
708 return 0;
709 }
710
711 static inline int is_null_sha1(const unsigned char *sha1)
712 {
713 return !hashcmp(sha1, null_sha1);
714 }
715
716 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
717 {
718 memcpy(sha_dst, sha_src, 20);
719 }
720 static inline void hashclr(unsigned char *hash)
721 {
722 memset(hash, 0, 20);
723 }
724
725 #define EMPTY_TREE_SHA1_HEX \
726 "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
727 #define EMPTY_TREE_SHA1_BIN_LITERAL \
728 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
729 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
730 #define EMPTY_TREE_SHA1_BIN \
731 ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
732
733 #define EMPTY_BLOB_SHA1_HEX \
734 "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
735 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
736 "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
737 "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
738 #define EMPTY_BLOB_SHA1_BIN \
739 ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
740
741 static inline int is_empty_blob_sha1(const unsigned char *sha1)
742 {
743 return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
744 }
745
746 int git_mkstemp(char *path, size_t n, const char *template);
747
748 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
749
750 /* set default permissions by passing mode arguments to open(2) */
751 int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
752 int git_mkstemp_mode(char *pattern, int mode);
753
754 /*
755 * NOTE NOTE NOTE!!
756 *
757 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
758 * not be changed. Old repositories have core.sharedrepository written in
759 * numeric format, and therefore these values are preserved for compatibility
760 * reasons.
761 */
762 enum sharedrepo {
763 PERM_UMASK = 0,
764 OLD_PERM_GROUP = 1,
765 OLD_PERM_EVERYBODY = 2,
766 PERM_GROUP = 0660,
767 PERM_EVERYBODY = 0664
768 };
769 int git_config_perm(const char *var, const char *value);
770 int adjust_shared_perm(const char *path);
771
772 /*
773 * Create the directory containing the named path, using care to be
774 * somewhat safe against races. Return one of the scld_error values
775 * to indicate success/failure.
776 *
777 * SCLD_VANISHED indicates that one of the ancestor directories of the
778 * path existed at one point during the function call and then
779 * suddenly vanished, probably because another process pruned the
780 * directory while we were working. To be robust against this kind of
781 * race, callers might want to try invoking the function again when it
782 * returns SCLD_VANISHED.
783 */
784 enum scld_error {
785 SCLD_OK = 0,
786 SCLD_FAILED = -1,
787 SCLD_PERMS = -2,
788 SCLD_EXISTS = -3,
789 SCLD_VANISHED = -4
790 };
791 enum scld_error safe_create_leading_directories(char *path);
792 enum scld_error safe_create_leading_directories_const(const char *path);
793
794 int mkdir_in_gitdir(const char *path);
795 extern void home_config_paths(char **global, char **xdg, char *file);
796 extern char *expand_user_path(const char *path);
797 const char *enter_repo(const char *path, int strict);
798 static inline int is_absolute_path(const char *path)
799 {
800 return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
801 }
802 int is_directory(const char *);
803 const char *real_path(const char *path);
804 const char *real_path_if_valid(const char *path);
805 const char *absolute_path(const char *path);
806 const char *remove_leading_path(const char *in, const char *prefix);
807 const char *relative_path(const char *in, const char *prefix, struct strbuf *sb);
808 int normalize_path_copy_len(char *dst, const char *src, int *prefix_len);
809 int normalize_path_copy(char *dst, const char *src);
810 int longest_ancestor_length(const char *path, struct string_list *prefixes);
811 char *strip_path_suffix(const char *path, const char *suffix);
812 int daemon_avoid_alias(const char *path);
813 int offset_1st_component(const char *path);
814
815 /* object replacement */
816 #define LOOKUP_REPLACE_OBJECT 1
817 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
818 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
819 {
820 return read_sha1_file_extended(sha1, type, size, LOOKUP_REPLACE_OBJECT);
821 }
822
823 /*
824 * This internal function is only declared here for the benefit of
825 * lookup_replace_object(). Please do not call it directly.
826 */
827 extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
828
829 /*
830 * If object sha1 should be replaced, return the replacement object's
831 * name (replaced recursively, if necessary). The return value is
832 * either sha1 or a pointer to a permanently-allocated value. When
833 * object replacement is suppressed, always return sha1.
834 */
835 static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
836 {
837 if (!check_replace_refs)
838 return sha1;
839 return do_lookup_replace_object(sha1);
840 }
841
842 static inline const unsigned char *lookup_replace_object_extended(const unsigned char *sha1, unsigned flag)
843 {
844 if (!(flag & LOOKUP_REPLACE_OBJECT))
845 return sha1;
846 return lookup_replace_object(sha1);
847 }
848
849 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
850 extern int sha1_object_info(const unsigned char *, unsigned long *);
851 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
852 extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
853 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
854 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
855 extern int git_open_noatime(const char *name);
856 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
857 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
858 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
859
860 /* global flag to enable extra checks when accessing packed objects */
861 extern int do_check_packed_object_crc;
862
863 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
864
865 extern int move_temp_to_file(const char *tmpfile, const char *filename);
866
867 extern int has_sha1_pack(const unsigned char *sha1);
868
869 /*
870 * Return true iff we have an object named sha1, whether local or in
871 * an alternate object database, and whether packed or loose. This
872 * function does not respect replace references.
873 */
874 extern int has_sha1_file(const unsigned char *sha1);
875
876 /*
877 * Return true iff an alternate object database has a loose object
878 * with the specified name. This function does not respect replace
879 * references.
880 */
881 extern int has_loose_object_nonlocal(const unsigned char *sha1);
882
883 extern int has_pack_index(const unsigned char *sha1);
884
885 extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
886
887 extern const signed char hexval_table[256];
888 static inline unsigned int hexval(unsigned char c)
889 {
890 return hexval_table[c];
891 }
892
893 /* Convert to/from hex/sha1 representation */
894 #define MINIMUM_ABBREV minimum_abbrev
895 #define DEFAULT_ABBREV default_abbrev
896
897 struct object_context {
898 unsigned char tree[20];
899 char path[PATH_MAX];
900 unsigned mode;
901 };
902
903 #define GET_SHA1_QUIETLY 01
904 #define GET_SHA1_COMMIT 02
905 #define GET_SHA1_COMMITTISH 04
906 #define GET_SHA1_TREE 010
907 #define GET_SHA1_TREEISH 020
908 #define GET_SHA1_BLOB 040
909 #define GET_SHA1_ONLY_TO_DIE 04000
910
911 extern int get_sha1(const char *str, unsigned char *sha1);
912 extern int get_sha1_commit(const char *str, unsigned char *sha1);
913 extern int get_sha1_committish(const char *str, unsigned char *sha1);
914 extern int get_sha1_tree(const char *str, unsigned char *sha1);
915 extern int get_sha1_treeish(const char *str, unsigned char *sha1);
916 extern int get_sha1_blob(const char *str, unsigned char *sha1);
917 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
918 extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
919
920 typedef int each_abbrev_fn(const unsigned char *sha1, void *);
921 extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
922
923 /*
924 * Try to read a SHA1 in hexadecimal format from the 40 characters
925 * starting at hex. Write the 20-byte result to sha1 in binary form.
926 * Return 0 on success. Reading stops if a NUL is encountered in the
927 * input, so it is safe to pass this function an arbitrary
928 * null-terminated string.
929 */
930 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
931
932 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
933 extern int read_ref_full(const char *refname, unsigned char *sha1,
934 int reading, int *flags);
935 extern int read_ref(const char *refname, unsigned char *sha1);
936
937 /*
938 * Resolve a reference, recursively following symbolic refererences.
939 *
940 * Store the referred-to object's name in sha1 and return the name of
941 * the non-symbolic reference that ultimately pointed at it. The
942 * return value, if not NULL, is a pointer into either a static buffer
943 * or the input ref.
944 *
945 * If the reference cannot be resolved to an object, the behavior
946 * depends on the "reading" argument:
947 *
948 * - If reading is set, return NULL.
949 *
950 * - If reading is not set, clear sha1 and return the name of the last
951 * reference name in the chain, which will either be a non-symbolic
952 * reference or an undefined reference. If this is a prelude to
953 * "writing" to the ref, the return value is the name of the ref
954 * that will actually be created or changed.
955 *
956 * If flag is non-NULL, set the value that it points to the
957 * combination of REF_ISPACKED (if the reference was found among the
958 * packed references) and REF_ISSYMREF (if the initial reference was a
959 * symbolic reference).
960 *
961 * If ref is not a properly-formatted, normalized reference, return
962 * NULL. If more than MAXDEPTH recursive symbolic lookups are needed,
963 * give up and return NULL.
964 *
965 * errno is sometimes set on errors, but not always.
966 */
967 extern const char *resolve_ref_unsafe(const char *ref, unsigned char *sha1, int reading, int *flag);
968 extern char *resolve_refdup(const char *ref, unsigned char *sha1, int reading, int *flag);
969
970 extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
971 extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
972 extern int interpret_branch_name(const char *str, int len, struct strbuf *);
973 extern int get_sha1_mb(const char *str, unsigned char *sha1);
974
975 /*
976 * Return true iff abbrev_name is a possible abbreviation for
977 * full_name according to the rules defined by ref_rev_parse_rules in
978 * refs.c.
979 */
980 extern int refname_match(const char *abbrev_name, const char *full_name);
981
982 extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
983 extern int validate_headref(const char *ref);
984
985 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
986 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
987 extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
988 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
989
990 extern void *read_object_with_reference(const unsigned char *sha1,
991 const char *required_type,
992 unsigned long *size,
993 unsigned char *sha1_ret);
994
995 extern struct object *peel_to_type(const char *name, int namelen,
996 struct object *o, enum object_type);
997
998 enum date_mode {
999 DATE_NORMAL = 0,
1000 DATE_RELATIVE,
1001 DATE_SHORT,
1002 DATE_LOCAL,
1003 DATE_ISO8601,
1004 DATE_RFC2822,
1005 DATE_RAW
1006 };
1007
1008 const char *show_date(unsigned long time, int timezone, enum date_mode mode);
1009 void show_date_relative(unsigned long time, int tz, const struct timeval *now,
1010 struct strbuf *timebuf);
1011 int parse_date(const char *date, char *buf, int bufsize);
1012 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
1013 int parse_expiry_date(const char *date, unsigned long *timestamp);
1014 void datestamp(char *buf, int bufsize);
1015 #define approxidate(s) approxidate_careful((s), NULL)
1016 unsigned long approxidate_careful(const char *, int *);
1017 unsigned long approxidate_relative(const char *date, const struct timeval *now);
1018 enum date_mode parse_date_format(const char *format);
1019 int date_overflows(unsigned long date);
1020
1021 #define IDENT_STRICT 1
1022 #define IDENT_NO_DATE 2
1023 #define IDENT_NO_NAME 4
1024 extern const char *git_author_info(int);
1025 extern const char *git_committer_info(int);
1026 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
1027 extern const char *fmt_name(const char *name, const char *email);
1028 extern const char *ident_default_email(void);
1029 extern const char *git_editor(void);
1030 extern const char *git_pager(int stdout_is_tty);
1031 extern int git_ident_config(const char *, const char *, void *);
1032
1033 struct ident_split {
1034 const char *name_begin;
1035 const char *name_end;
1036 const char *mail_begin;
1037 const char *mail_end;
1038 const char *date_begin;
1039 const char *date_end;
1040 const char *tz_begin;
1041 const char *tz_end;
1042 };
1043 /*
1044 * Signals an success with 0, but time part of the result may be NULL
1045 * if the input lacks timestamp and zone
1046 */
1047 extern int split_ident_line(struct ident_split *, const char *, int);
1048
1049 /*
1050 * Compare split idents for equality or strict ordering. Note that we
1051 * compare only the ident part of the line, ignoring any timestamp.
1052 *
1053 * Because there are two fields, we must choose one as the primary key; we
1054 * currently arbitrarily pick the email.
1055 */
1056 extern int ident_cmp(const struct ident_split *, const struct ident_split *);
1057
1058 struct checkout {
1059 const char *base_dir;
1060 int base_dir_len;
1061 unsigned force:1,
1062 quiet:1,
1063 not_new:1,
1064 refresh_cache:1;
1065 };
1066
1067 #define TEMPORARY_FILENAME_LENGTH 25
1068 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
1069
1070 struct cache_def {
1071 char path[PATH_MAX + 1];
1072 int len;
1073 int flags;
1074 int track_flags;
1075 int prefix_len_stat_func;
1076 };
1077
1078 extern int has_symlink_leading_path(const char *name, int len);
1079 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
1080 extern int check_leading_path(const char *name, int len);
1081 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
1082 extern void schedule_dir_for_removal(const char *name, int len);
1083 extern void remove_scheduled_dirs(void);
1084
1085 extern struct alternate_object_database {
1086 struct alternate_object_database *next;
1087 char *name;
1088 char base[FLEX_ARRAY]; /* more */
1089 } *alt_odb_list;
1090 extern void prepare_alt_odb(void);
1091 extern void read_info_alternates(const char * relative_base, int depth);
1092 extern void add_to_alternates_file(const char *reference);
1093 typedef int alt_odb_fn(struct alternate_object_database *, void *);
1094 extern void foreach_alt_odb(alt_odb_fn, void*);
1095
1096 struct pack_window {
1097 struct pack_window *next;
1098 unsigned char *base;
1099 off_t offset;
1100 size_t len;
1101 unsigned int last_used;
1102 unsigned int inuse_cnt;
1103 };
1104
1105 extern struct packed_git {
1106 struct packed_git *next;
1107 struct pack_window *windows;
1108 off_t pack_size;
1109 const void *index_data;
1110 size_t index_size;
1111 uint32_t num_objects;
1112 uint32_t num_bad_objects;
1113 unsigned char *bad_object_sha1;
1114 int index_version;
1115 time_t mtime;
1116 int pack_fd;
1117 unsigned pack_local:1,
1118 pack_keep:1,
1119 do_not_close:1;
1120 unsigned char sha1[20];
1121 struct revindex_entry *revindex;
1122 /* something like ".git/objects/pack/xxxxx.pack" */
1123 char pack_name[FLEX_ARRAY]; /* more */
1124 } *packed_git;
1125
1126 struct pack_entry {
1127 off_t offset;
1128 unsigned char sha1[20];
1129 struct packed_git *p;
1130 };
1131
1132 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1133
1134 /* A hook for count-objects to report invalid files in pack directory */
1135 extern void (*report_garbage)(const char *desc, const char *path);
1136
1137 extern void prepare_packed_git(void);
1138 extern void reprepare_packed_git(void);
1139 extern void install_packed_git(struct packed_git *pack);
1140
1141 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1142 struct packed_git *packs);
1143
1144 extern void pack_report(void);
1145
1146 /*
1147 * mmap the index file for the specified packfile (if it is not
1148 * already mmapped). Return 0 on success.
1149 */
1150 extern int open_pack_index(struct packed_git *);
1151
1152 /*
1153 * munmap the index file for the specified packfile (if it is
1154 * currently mmapped).
1155 */
1156 extern void close_pack_index(struct packed_git *);
1157
1158 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1159 extern void close_pack_windows(struct packed_git *);
1160 extern void unuse_pack(struct pack_window **);
1161 extern void free_pack_by_name(const char *);
1162 extern void clear_delta_base_cache(void);
1163 extern struct packed_git *add_packed_git(const char *, int, int);
1164
1165 /*
1166 * Return the SHA-1 of the nth object within the specified packfile.
1167 * Open the index if it is not already open. The return value points
1168 * at the SHA-1 within the mmapped index. Return NULL if there is an
1169 * error.
1170 */
1171 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
1172
1173 /*
1174 * Return the offset of the nth object within the specified packfile.
1175 * The index must already be opened.
1176 */
1177 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
1178
1179 /*
1180 * If the object named sha1 is present in the specified packfile,
1181 * return its offset within the packfile; otherwise, return 0.
1182 */
1183 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
1184
1185 extern int is_pack_valid(struct packed_git *);
1186 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1187 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1188 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1189 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1190
1191 struct object_info {
1192 /* Request */
1193 enum object_type *typep;
1194 unsigned long *sizep;
1195 unsigned long *disk_sizep;
1196 unsigned char *delta_base_sha1;
1197
1198 /* Response */
1199 enum {
1200 OI_CACHED,
1201 OI_LOOSE,
1202 OI_PACKED,
1203 OI_DBCACHED
1204 } whence;
1205 union {
1206 /*
1207 * struct {
1208 * ... Nothing to expose in this case
1209 * } cached;
1210 * struct {
1211 * ... Nothing to expose in this case
1212 * } loose;
1213 */
1214 struct {
1215 struct packed_git *pack;
1216 off_t offset;
1217 unsigned int is_delta;
1218 } packed;
1219 } u;
1220 };
1221 extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
1222
1223 /* Dumb servers support */
1224 extern int update_server_info(int);
1225
1226 /* git_config_parse_key() returns these negated: */
1227 #define CONFIG_INVALID_KEY 1
1228 #define CONFIG_NO_SECTION_OR_NAME 2
1229 /* git_config_set(), git_config_set_multivar() return the above or these: */
1230 #define CONFIG_NO_LOCK -1
1231 #define CONFIG_INVALID_FILE 3
1232 #define CONFIG_NO_WRITE 4
1233 #define CONFIG_NOTHING_SET 5
1234 #define CONFIG_INVALID_PATTERN 6
1235 #define CONFIG_GENERIC_ERROR 7
1236
1237 struct git_config_source {
1238 unsigned int use_stdin:1;
1239 const char *file;
1240 const char *blob;
1241 };
1242
1243 typedef int (*config_fn_t)(const char *, const char *, void *);
1244 extern int git_default_config(const char *, const char *, void *);
1245 extern int git_config_from_file(config_fn_t fn, const char *, void *);
1246 extern int git_config_from_buf(config_fn_t fn, const char *name,
1247 const char *buf, size_t len, void *data);
1248 extern void git_config_push_parameter(const char *text);
1249 extern int git_config_from_parameters(config_fn_t fn, void *data);
1250 extern int git_config(config_fn_t fn, void *);
1251 extern int git_config_with_options(config_fn_t fn, void *,
1252 struct git_config_source *config_source,
1253 int respect_includes);
1254 extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
1255 extern int git_parse_ulong(const char *, unsigned long *);
1256 extern int git_config_int(const char *, const char *);
1257 extern int64_t git_config_int64(const char *, const char *);
1258 extern unsigned long git_config_ulong(const char *, const char *);
1259 extern int git_config_bool_or_int(const char *, const char *, int *);
1260 extern int git_config_bool(const char *, const char *);
1261 extern int git_config_maybe_bool(const char *, const char *);
1262 extern int git_config_string(const char **, const char *, const char *);
1263 extern int git_config_pathname(const char **, const char *, const char *);
1264 extern int git_config_set_in_file(const char *, const char *, const char *);
1265 extern int git_config_set(const char *, const char *);
1266 extern int git_config_parse_key(const char *, char **, int *);
1267 extern int git_config_set_multivar(const char *, const char *, const char *, int);
1268 extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1269 extern int git_config_rename_section(const char *, const char *);
1270 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1271 extern const char *git_etc_gitconfig(void);
1272 extern int check_repository_format_version(const char *var, const char *value, void *cb);
1273 extern int git_env_bool(const char *, int);
1274 extern int git_config_system(void);
1275 extern int config_error_nonbool(const char *);
1276 #if defined(__GNUC__) && ! defined(__clang__)
1277 #define config_error_nonbool(s) (config_error_nonbool(s), -1)
1278 #endif
1279 extern const char *get_log_output_encoding(void);
1280 extern const char *get_commit_output_encoding(void);
1281
1282 extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1283
1284 struct config_include_data {
1285 int depth;
1286 config_fn_t fn;
1287 void *data;
1288 };
1289 #define CONFIG_INCLUDE_INIT { 0 }
1290 extern int git_config_include(const char *name, const char *value, void *data);
1291
1292 /*
1293 * Match and parse a config key of the form:
1294 *
1295 * section.(subsection.)?key
1296 *
1297 * (i.e., what gets handed to a config_fn_t). The caller provides the section;
1298 * we return -1 if it does not match, 0 otherwise. The subsection and key
1299 * out-parameters are filled by the function (and subsection is NULL if it is
1300 * missing).
1301 */
1302 extern int parse_config_key(const char *var,
1303 const char *section,
1304 const char **subsection, int *subsection_len,
1305 const char **key);
1306
1307 extern int committer_ident_sufficiently_given(void);
1308 extern int author_ident_sufficiently_given(void);
1309
1310 extern const char *git_commit_encoding;
1311 extern const char *git_log_output_encoding;
1312 extern const char *git_mailmap_file;
1313 extern const char *git_mailmap_blob;
1314
1315 /* IO helper functions */
1316 extern void maybe_flush_or_die(FILE *, const char *);
1317 extern int copy_fd(int ifd, int ofd);
1318 extern int copy_file(const char *dst, const char *src, int mode);
1319 extern int copy_file_with_time(const char *dst, const char *src, int mode);
1320 extern void write_or_die(int fd, const void *buf, size_t count);
1321 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1322 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1323 extern void fsync_or_die(int fd, const char *);
1324
1325 extern ssize_t read_in_full(int fd, void *buf, size_t count);
1326 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1327 static inline ssize_t write_str_in_full(int fd, const char *str)
1328 {
1329 return write_in_full(fd, str, strlen(str));
1330 }
1331
1332 /* pager.c */
1333 extern void setup_pager(void);
1334 extern const char *pager_program;
1335 extern int pager_in_use(void);
1336 extern int pager_use_color;
1337 extern int term_columns(void);
1338 extern int decimal_width(int);
1339 extern int check_pager_config(const char *cmd);
1340
1341 extern const char *editor_program;
1342 extern const char *askpass_program;
1343 extern const char *excludes_file;
1344
1345 /* base85 */
1346 int decode_85(char *dst, const char *line, int linelen);
1347 void encode_85(char *buf, const unsigned char *data, int bytes);
1348
1349 /* alloc.c */
1350 extern void *alloc_blob_node(void);
1351 extern void *alloc_tree_node(void);
1352 extern void *alloc_commit_node(void);
1353 extern void *alloc_tag_node(void);
1354 extern void *alloc_object_node(void);
1355 extern void alloc_report(void);
1356
1357 /* trace.c */
1358 __attribute__((format (printf, 1, 2)))
1359 extern void trace_printf(const char *format, ...);
1360 __attribute__((format (printf, 2, 3)))
1361 extern void trace_argv_printf(const char **argv, const char *format, ...);
1362 extern void trace_repo_setup(const char *prefix);
1363 extern int trace_want(const char *key);
1364 __attribute__((format (printf, 2, 3)))
1365 extern void trace_printf_key(const char *key, const char *fmt, ...);
1366 extern void trace_strbuf(const char *key, const struct strbuf *buf);
1367
1368 void packet_trace_identity(const char *prog);
1369
1370 /* add */
1371 /*
1372 * return 0 if success, 1 - if addition of a file failed and
1373 * ADD_FILES_IGNORE_ERRORS was specified in flags
1374 */
1375 int add_files_to_cache(const char *prefix, const struct pathspec *pathspec, int flags);
1376
1377 /* diff.c */
1378 extern int diff_auto_refresh_index;
1379
1380 /* match-trees.c */
1381 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1382 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1383
1384 /*
1385 * whitespace rules.
1386 * used by both diff and apply
1387 * last two digits are tab width
1388 */
1389 #define WS_BLANK_AT_EOL 0100
1390 #define WS_SPACE_BEFORE_TAB 0200
1391 #define WS_INDENT_WITH_NON_TAB 0400
1392 #define WS_CR_AT_EOL 01000
1393 #define WS_BLANK_AT_EOF 02000
1394 #define WS_TAB_IN_INDENT 04000
1395 #define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1396 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1397 #define WS_TAB_WIDTH_MASK 077
1398 extern unsigned whitespace_rule_cfg;
1399 extern unsigned whitespace_rule(const char *);
1400 extern unsigned parse_whitespace_rule(const char *);
1401 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1402 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1403 extern char *whitespace_error_string(unsigned ws);
1404 extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1405 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1406 #define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)
1407
1408 /* ls-files */
1409 int report_path_error(const char *ps_matched, const struct pathspec *pathspec, const char *prefix);
1410 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1411
1412 char *alias_lookup(const char *alias);
1413 int split_cmdline(char *cmdline, const char ***argv);
1414 /* Takes a negative value returned by split_cmdline */
1415 const char *split_cmdline_strerror(int cmdline_errno);
1416
1417 /* git.c */
1418 struct startup_info {
1419 int have_repository;
1420 const char *prefix;
1421 };
1422 extern struct startup_info *startup_info;
1423
1424 /* merge.c */
1425 struct commit_list;
1426 int try_merge_command(const char *strategy, size_t xopts_nr,
1427 const char **xopts, struct commit_list *common,
1428 const char *head_arg, struct commit_list *remotes);
1429 int checkout_fast_forward(const unsigned char *from,
1430 const unsigned char *to,
1431 int overwrite_ignore);
1432
1433
1434 int sane_execvp(const char *file, char *const argv[]);
1435
1436 /*
1437 * A struct to encapsulate the concept of whether a file has changed
1438 * since we last checked it. This uses criteria similar to those used
1439 * for the index.
1440 */
1441 struct stat_validity {
1442 struct stat_data *sd;
1443 };
1444
1445 void stat_validity_clear(struct stat_validity *sv);
1446
1447 /*
1448 * Returns 1 if the path is a regular file (or a symlink to a regular
1449 * file) and matches the saved stat_validity, 0 otherwise. A missing
1450 * or inaccessible file is considered a match if the struct was just
1451 * initialized, or if the previous update found an inaccessible file.
1452 */
1453 int stat_validity_check(struct stat_validity *sv, const char *path);
1454
1455 /*
1456 * Update the stat_validity from a file opened at descriptor fd. If
1457 * the file is missing, inaccessible, or not a regular file, then
1458 * future calls to stat_validity_check will match iff one of those
1459 * conditions continues to be true.
1460 */
1461 void stat_validity_update(struct stat_validity *sv, int fd);
1462
1463 int versioncmp(const char *s1, const char *s2);
1464
1465 #endif /* CACHE_H */