Merge branch 'dt/name-hash-dir-entry-fix'
[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 "trace.h"
11 #include "string-list.h"
12
13 #include SHA1_HEADER
14 #ifndef git_SHA_CTX
15 #define git_SHA_CTX SHA_CTX
16 #define git_SHA1_Init SHA1_Init
17 #define git_SHA1_Update SHA1_Update
18 #define git_SHA1_Final SHA1_Final
19 #endif
20
21 #include <zlib.h>
22 typedef struct git_zstream {
23 z_stream z;
24 unsigned long avail_in;
25 unsigned long avail_out;
26 unsigned long total_in;
27 unsigned long total_out;
28 unsigned char *next_in;
29 unsigned char *next_out;
30 } git_zstream;
31
32 void git_inflate_init(git_zstream *);
33 void git_inflate_init_gzip_only(git_zstream *);
34 void git_inflate_end(git_zstream *);
35 int git_inflate(git_zstream *, int flush);
36
37 void git_deflate_init(git_zstream *, int level);
38 void git_deflate_init_gzip(git_zstream *, int level);
39 void git_deflate_init_raw(git_zstream *, int level);
40 void git_deflate_end(git_zstream *);
41 int git_deflate_abort(git_zstream *);
42 int git_deflate_end_gently(git_zstream *);
43 int git_deflate(git_zstream *, int flush);
44 unsigned long git_deflate_bound(git_zstream *, unsigned long);
45
46 /* The length in bytes and in hex digits of an object name (SHA-1 value). */
47 #define GIT_SHA1_RAWSZ 20
48 #define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ)
49
50 struct object_id {
51 unsigned char hash[GIT_SHA1_RAWSZ];
52 };
53
54 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
55 #define DTYPE(de) ((de)->d_type)
56 #else
57 #undef DT_UNKNOWN
58 #undef DT_DIR
59 #undef DT_REG
60 #undef DT_LNK
61 #define DT_UNKNOWN 0
62 #define DT_DIR 1
63 #define DT_REG 2
64 #define DT_LNK 3
65 #define DTYPE(de) DT_UNKNOWN
66 #endif
67
68 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
69 #define S_IFINVALID 0030000
70
71 /*
72 * A "directory link" is a link to another git directory.
73 *
74 * The value 0160000 is not normally a valid mode, and
75 * also just happens to be S_IFDIR + S_IFLNK
76 */
77 #define S_IFGITLINK 0160000
78 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
79
80 /*
81 * Some mode bits are also used internally for computations.
82 *
83 * They *must* not overlap with any valid modes, and they *must* not be emitted
84 * to outside world - i.e. appear on disk or network. In other words, it's just
85 * temporary fields, which we internally use, but they have to stay in-house.
86 *
87 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git
88 * codebase mode is `unsigned int` which is assumed to be at least 32 bits )
89 */
90
91 /* used internally in tree-diff */
92 #define S_DIFFTREE_IFXMIN_NEQ 0x80000000
93
94
95 /*
96 * Intensive research over the course of many years has shown that
97 * port 9418 is totally unused by anything else. Or
98 *
99 * Your search - "port 9418" - did not match any documents.
100 *
101 * as www.google.com puts it.
102 *
103 * This port has been properly assigned for git use by IANA:
104 * git (Assigned-9418) [I06-050728-0001].
105 *
106 * git 9418/tcp git pack transfer service
107 * git 9418/udp git pack transfer service
108 *
109 * with Linus Torvalds <torvalds@osdl.org> as the point of
110 * contact. September 2005.
111 *
112 * See http://www.iana.org/assignments/port-numbers
113 */
114 #define DEFAULT_GIT_PORT 9418
115
116 /*
117 * Basic data structures for the directory cache
118 */
119
120 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
121 struct cache_header {
122 uint32_t hdr_signature;
123 uint32_t hdr_version;
124 uint32_t hdr_entries;
125 };
126
127 #define INDEX_FORMAT_LB 2
128 #define INDEX_FORMAT_UB 4
129
130 /*
131 * The "cache_time" is just the low 32 bits of the
132 * time. It doesn't matter if it overflows - we only
133 * check it for equality in the 32 bits we save.
134 */
135 struct cache_time {
136 uint32_t sec;
137 uint32_t nsec;
138 };
139
140 struct stat_data {
141 struct cache_time sd_ctime;
142 struct cache_time sd_mtime;
143 unsigned int sd_dev;
144 unsigned int sd_ino;
145 unsigned int sd_uid;
146 unsigned int sd_gid;
147 unsigned int sd_size;
148 };
149
150 struct cache_entry {
151 struct hashmap_entry ent;
152 struct stat_data ce_stat_data;
153 unsigned int ce_mode;
154 unsigned int ce_flags;
155 unsigned int ce_namelen;
156 unsigned int index; /* for link extension */
157 unsigned char sha1[20];
158 char name[FLEX_ARRAY]; /* more */
159 };
160
161 #define CE_STAGEMASK (0x3000)
162 #define CE_EXTENDED (0x4000)
163 #define CE_VALID (0x8000)
164 #define CE_STAGESHIFT 12
165
166 /*
167 * Range 0xFFFF0FFF in ce_flags is divided into
168 * two parts: in-memory flags and on-disk ones.
169 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
170 * if you want to save a new flag, add it in
171 * CE_EXTENDED_FLAGS
172 *
173 * In-memory only flags
174 */
175 #define CE_UPDATE (1 << 16)
176 #define CE_REMOVE (1 << 17)
177 #define CE_UPTODATE (1 << 18)
178 #define CE_ADDED (1 << 19)
179
180 #define CE_HASHED (1 << 20)
181 #define CE_WT_REMOVE (1 << 22) /* remove in work directory */
182 #define CE_CONFLICTED (1 << 23)
183
184 #define CE_UNPACKED (1 << 24)
185 #define CE_NEW_SKIP_WORKTREE (1 << 25)
186
187 /* used to temporarily mark paths matched by pathspecs */
188 #define CE_MATCHED (1 << 26)
189
190 #define CE_UPDATE_IN_BASE (1 << 27)
191 #define CE_STRIP_NAME (1 << 28)
192
193 /*
194 * Extended on-disk flags
195 */
196 #define CE_INTENT_TO_ADD (1 << 29)
197 #define CE_SKIP_WORKTREE (1 << 30)
198 /* CE_EXTENDED2 is for future extension */
199 #define CE_EXTENDED2 (1 << 31)
200
201 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
202
203 /*
204 * Safeguard to avoid saving wrong flags:
205 * - CE_EXTENDED2 won't get saved until its semantic is known
206 * - Bits in 0x0000FFFF have been saved in ce_flags already
207 * - Bits in 0x003F0000 are currently in-memory flags
208 */
209 #if CE_EXTENDED_FLAGS & 0x803FFFFF
210 #error "CE_EXTENDED_FLAGS out of range"
211 #endif
212
213 struct pathspec;
214
215 /*
216 * Copy the sha1 and stat state of a cache entry from one to
217 * another. But we never change the name, or the hash state!
218 */
219 static inline void copy_cache_entry(struct cache_entry *dst,
220 const struct cache_entry *src)
221 {
222 unsigned int state = dst->ce_flags & CE_HASHED;
223
224 /* Don't copy hash chain and name */
225 memcpy(&dst->ce_stat_data, &src->ce_stat_data,
226 offsetof(struct cache_entry, name) -
227 offsetof(struct cache_entry, ce_stat_data));
228
229 /* Restore the hash state */
230 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
231 }
232
233 static inline unsigned create_ce_flags(unsigned stage)
234 {
235 return (stage << CE_STAGESHIFT);
236 }
237
238 #define ce_namelen(ce) ((ce)->ce_namelen)
239 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
240 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
241 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
242 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
243 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
244
245 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
246 static inline unsigned int create_ce_mode(unsigned int mode)
247 {
248 if (S_ISLNK(mode))
249 return S_IFLNK;
250 if (S_ISDIR(mode) || S_ISGITLINK(mode))
251 return S_IFGITLINK;
252 return S_IFREG | ce_permissions(mode);
253 }
254 static inline unsigned int ce_mode_from_stat(const struct cache_entry *ce,
255 unsigned int mode)
256 {
257 extern int trust_executable_bit, has_symlinks;
258 if (!has_symlinks && S_ISREG(mode) &&
259 ce && S_ISLNK(ce->ce_mode))
260 return ce->ce_mode;
261 if (!trust_executable_bit && S_ISREG(mode)) {
262 if (ce && S_ISREG(ce->ce_mode))
263 return ce->ce_mode;
264 return create_ce_mode(0666);
265 }
266 return create_ce_mode(mode);
267 }
268 static inline int ce_to_dtype(const struct cache_entry *ce)
269 {
270 unsigned ce_mode = ntohl(ce->ce_mode);
271 if (S_ISREG(ce_mode))
272 return DT_REG;
273 else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
274 return DT_DIR;
275 else if (S_ISLNK(ce_mode))
276 return DT_LNK;
277 else
278 return DT_UNKNOWN;
279 }
280 static inline unsigned int canon_mode(unsigned int mode)
281 {
282 if (S_ISREG(mode))
283 return S_IFREG | ce_permissions(mode);
284 if (S_ISLNK(mode))
285 return S_IFLNK;
286 if (S_ISDIR(mode))
287 return S_IFDIR;
288 return S_IFGITLINK;
289 }
290
291 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
292
293 #define SOMETHING_CHANGED (1 << 0) /* unclassified changes go here */
294 #define CE_ENTRY_CHANGED (1 << 1)
295 #define CE_ENTRY_REMOVED (1 << 2)
296 #define CE_ENTRY_ADDED (1 << 3)
297 #define RESOLVE_UNDO_CHANGED (1 << 4)
298 #define CACHE_TREE_CHANGED (1 << 5)
299 #define SPLIT_INDEX_ORDERED (1 << 6)
300 #define UNTRACKED_CHANGED (1 << 7)
301
302 struct split_index;
303 struct untracked_cache;
304
305 struct index_state {
306 struct cache_entry **cache;
307 unsigned int version;
308 unsigned int cache_nr, cache_alloc, cache_changed;
309 struct string_list *resolve_undo;
310 struct cache_tree *cache_tree;
311 struct split_index *split_index;
312 struct cache_time timestamp;
313 unsigned name_hash_initialized : 1,
314 initialized : 1;
315 struct hashmap name_hash;
316 struct hashmap dir_hash;
317 unsigned char sha1[20];
318 struct untracked_cache *untracked;
319 };
320
321 extern struct index_state the_index;
322
323 /* Name hashing */
324 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
325 extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
326 extern void free_name_hash(struct index_state *istate);
327
328
329 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
330 #define active_cache (the_index.cache)
331 #define active_nr (the_index.cache_nr)
332 #define active_alloc (the_index.cache_alloc)
333 #define active_cache_changed (the_index.cache_changed)
334 #define active_cache_tree (the_index.cache_tree)
335
336 #define read_cache() read_index(&the_index)
337 #define read_cache_from(path) read_index_from(&the_index, (path))
338 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
339 #define is_cache_unborn() is_index_unborn(&the_index)
340 #define read_cache_unmerged() read_index_unmerged(&the_index)
341 #define discard_cache() discard_index(&the_index)
342 #define unmerged_cache() unmerged_index(&the_index)
343 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
344 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
345 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
346 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
347 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
348 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
349 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
350 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
351 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
352 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
353 #define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
354 #define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
355 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
356 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
357 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
358 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
359 #define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
360 #endif
361
362 enum object_type {
363 OBJ_BAD = -1,
364 OBJ_NONE = 0,
365 OBJ_COMMIT = 1,
366 OBJ_TREE = 2,
367 OBJ_BLOB = 3,
368 OBJ_TAG = 4,
369 /* 5 for future expansion */
370 OBJ_OFS_DELTA = 6,
371 OBJ_REF_DELTA = 7,
372 OBJ_ANY,
373 OBJ_MAX
374 };
375
376 static inline enum object_type object_type(unsigned int mode)
377 {
378 return S_ISDIR(mode) ? OBJ_TREE :
379 S_ISGITLINK(mode) ? OBJ_COMMIT :
380 OBJ_BLOB;
381 }
382
383 /* Double-check local_repo_env below if you add to this list. */
384 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
385 #define GIT_COMMON_DIR_ENVIRONMENT "GIT_COMMON_DIR"
386 #define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
387 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
388 #define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
389 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
390 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
391 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
392 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
393 #define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
394 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
395 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
396 #define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
397 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
398 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
399 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
400 #define GIT_REPLACE_REF_BASE_ENVIRONMENT "GIT_REPLACE_REF_BASE"
401 #define GITATTRIBUTES_FILE ".gitattributes"
402 #define INFOATTRIBUTES_FILE "info/attributes"
403 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
404 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
405 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
406 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
407 #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
408 #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
409 #define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
410 #define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
411 #define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
412 #define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
413
414 /*
415 * This environment variable is expected to contain a boolean indicating
416 * whether we should or should not treat:
417 *
418 * GIT_DIR=foo.git git ...
419 *
420 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use
421 * of this, but we use it internally to communicate to sub-processes that we
422 * are in a bare repo. If not set, defaults to true.
423 */
424 #define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
425
426 /*
427 * Repository-local GIT_* environment variables; these will be cleared
428 * when git spawns a sub-process that runs inside another repository.
429 * The array is NULL-terminated, which makes it easy to pass in the "env"
430 * parameter of a run-command invocation, or to do a simple walk.
431 */
432 extern const char * const local_repo_env[];
433
434 extern int is_bare_repository_cfg;
435 extern int is_bare_repository(void);
436 extern int is_inside_git_dir(void);
437 extern char *git_work_tree_cfg;
438 extern int is_inside_work_tree(void);
439 extern const char *get_git_dir(void);
440 extern const char *get_git_common_dir(void);
441 extern int is_git_directory(const char *path);
442 extern char *get_object_directory(void);
443 extern char *get_index_file(void);
444 extern char *get_graft_file(void);
445 extern int set_git_dir(const char *path);
446 extern int get_common_dir_noenv(struct strbuf *sb, const char *gitdir);
447 extern int get_common_dir(struct strbuf *sb, const char *gitdir);
448 extern const char *get_git_namespace(void);
449 extern const char *strip_namespace(const char *namespaced_ref);
450 extern const char *get_git_work_tree(void);
451
452 #define READ_GITFILE_ERR_STAT_FAILED 1
453 #define READ_GITFILE_ERR_NOT_A_FILE 2
454 #define READ_GITFILE_ERR_OPEN_FAILED 3
455 #define READ_GITFILE_ERR_READ_FAILED 4
456 #define READ_GITFILE_ERR_INVALID_FORMAT 5
457 #define READ_GITFILE_ERR_NO_PATH 6
458 #define READ_GITFILE_ERR_NOT_A_REPO 7
459 #define READ_GITFILE_ERR_TOO_LARGE 8
460 extern const char *read_gitfile_gently(const char *path, int *return_error_code);
461 #define read_gitfile(path) read_gitfile_gently((path), NULL)
462 extern const char *resolve_gitdir(const char *suspect);
463 extern void set_git_work_tree(const char *tree);
464
465 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
466
467 extern const char **get_pathspec(const char *prefix, const char **pathspec);
468 extern void setup_work_tree(void);
469 extern const char *setup_git_directory_gently(int *);
470 extern const char *setup_git_directory(void);
471 extern char *prefix_path(const char *prefix, int len, const char *path);
472 extern char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
473 extern const char *prefix_filename(const char *prefix, int len, const char *path);
474 extern int check_filename(const char *prefix, const char *name);
475 extern void verify_filename(const char *prefix,
476 const char *name,
477 int diagnose_misspelt_rev);
478 extern void verify_non_filename(const char *prefix, const char *name);
479 extern int path_inside_repo(const char *prefix, const char *path);
480
481 #define INIT_DB_QUIET 0x0001
482
483 extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
484 extern int init_db(const char *template_dir, unsigned int flags);
485
486 extern void sanitize_stdfds(void);
487 extern int daemonize(void);
488
489 #define alloc_nr(x) (((x)+16)*3/2)
490
491 /*
492 * Realloc the buffer pointed at by variable 'x' so that it can hold
493 * at least 'nr' entries; the number of entries currently allocated
494 * is 'alloc', using the standard growing factor alloc_nr() macro.
495 *
496 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
497 */
498 #define ALLOC_GROW(x, nr, alloc) \
499 do { \
500 if ((nr) > alloc) { \
501 if (alloc_nr(alloc) < (nr)) \
502 alloc = (nr); \
503 else \
504 alloc = alloc_nr(alloc); \
505 REALLOC_ARRAY(x, alloc); \
506 } \
507 } while (0)
508
509 /* Initialize and use the cache information */
510 struct lock_file;
511 extern int read_index(struct index_state *);
512 extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
513 extern int do_read_index(struct index_state *istate, const char *path,
514 int must_exist); /* for testting only! */
515 extern int read_index_from(struct index_state *, const char *path);
516 extern int is_index_unborn(struct index_state *);
517 extern int read_index_unmerged(struct index_state *);
518 #define COMMIT_LOCK (1 << 0)
519 #define CLOSE_LOCK (1 << 1)
520 extern int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
521 extern int discard_index(struct index_state *);
522 extern int unmerged_index(const struct index_state *);
523 extern int verify_path(const char *path);
524 extern int index_dir_exists(struct index_state *istate, const char *name, int namelen);
525 extern void adjust_dirname_case(struct index_state *istate, char *name);
526 extern struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
527 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
528 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
529 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
530 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
531 #define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
532 #define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
533 #define ADD_CACHE_KEEP_CACHE_TREE 32 /* Do not invalidate cache-tree */
534 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
535 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
536 extern int remove_index_entry_at(struct index_state *, int pos);
537 extern void remove_marked_cache_entries(struct index_state *istate);
538 extern int remove_file_from_index(struct index_state *, const char *path);
539 #define ADD_CACHE_VERBOSE 1
540 #define ADD_CACHE_PRETEND 2
541 #define ADD_CACHE_IGNORE_ERRORS 4
542 #define ADD_CACHE_IGNORE_REMOVAL 8
543 #define ADD_CACHE_INTENT 16
544 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
545 extern int add_file_to_index(struct index_state *, const char *path, int flags);
546 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, unsigned int refresh_options);
547 extern int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
548 extern void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
549 extern int index_name_is_other(const struct index_state *, const char *, int);
550 extern void *read_blob_data_from_index(struct index_state *, const char *, unsigned long *);
551
552 /* do stat comparison even if CE_VALID is true */
553 #define CE_MATCH_IGNORE_VALID 01
554 /* do not check the contents but report dirty on racily-clean entries */
555 #define CE_MATCH_RACY_IS_DIRTY 02
556 /* do stat comparison even if CE_SKIP_WORKTREE is true */
557 #define CE_MATCH_IGNORE_SKIP_WORKTREE 04
558 /* ignore non-existent files during stat update */
559 #define CE_MATCH_IGNORE_MISSING 0x08
560 /* enable stat refresh */
561 #define CE_MATCH_REFRESH 0x10
562 extern int ie_match_stat(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
563 extern int ie_modified(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
564
565 #define HASH_WRITE_OBJECT 1
566 #define HASH_FORMAT_CHECK 2
567 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
568 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
569
570 /*
571 * Record to sd the data from st that we use to check whether a file
572 * might have changed.
573 */
574 extern void fill_stat_data(struct stat_data *sd, struct stat *st);
575
576 /*
577 * Return 0 if st is consistent with a file not having been changed
578 * since sd was filled. If there are differences, return a
579 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
580 * INODE_CHANGED, and DATA_CHANGED.
581 */
582 extern int match_stat_data(const struct stat_data *sd, struct stat *st);
583 extern int match_stat_data_racy(const struct index_state *istate,
584 const struct stat_data *sd, struct stat *st);
585
586 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
587
588 #define REFRESH_REALLY 0x0001 /* ignore_valid */
589 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
590 #define REFRESH_QUIET 0x0004 /* be quiet about it */
591 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
592 #define REFRESH_IGNORE_SUBMODULES 0x0010 /* ignore submodules */
593 #define REFRESH_IN_PORCELAIN 0x0020 /* user friendly output, not "needs update" */
594 extern int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
595
596 extern void update_index_if_able(struct index_state *, struct lock_file *);
597
598 extern int hold_locked_index(struct lock_file *, int);
599 extern void set_alternate_index_output(const char *);
600
601 /* Environment bits from configuration mechanism */
602 extern int trust_executable_bit;
603 extern int trust_ctime;
604 extern int check_stat;
605 extern int quote_path_fully;
606 extern int has_symlinks;
607 extern int minimum_abbrev, default_abbrev;
608 extern int ignore_case;
609 extern int assume_unchanged;
610 extern int prefer_symlink_refs;
611 extern int log_all_ref_updates;
612 extern int warn_ambiguous_refs;
613 extern int warn_on_object_refname_ambiguity;
614 extern int shared_repository;
615 extern const char *apply_default_whitespace;
616 extern const char *apply_default_ignorewhitespace;
617 extern const char *git_attributes_file;
618 extern int zlib_compression_level;
619 extern int core_compression_level;
620 extern int core_compression_seen;
621 extern size_t packed_git_window_size;
622 extern size_t packed_git_limit;
623 extern size_t delta_base_cache_limit;
624 extern unsigned long big_file_threshold;
625 extern unsigned long pack_size_limit_cfg;
626
627 /*
628 * Do replace refs need to be checked this run? This variable is
629 * initialized to true unless --no-replace-object is used or
630 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
631 * commands that do not want replace references to be active. As an
632 * optimization it is also set to false if replace references have
633 * been sought but there were none.
634 */
635 extern int check_replace_refs;
636 extern char *git_replace_ref_base;
637
638 extern int fsync_object_files;
639 extern int core_preload_index;
640 extern int core_apply_sparse_checkout;
641 extern int precomposed_unicode;
642 extern int protect_hfs;
643 extern int protect_ntfs;
644 extern int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
645
646 /*
647 * Include broken refs in all ref iterations, which will
648 * generally choke dangerous operations rather than letting
649 * them silently proceed without taking the broken ref into
650 * account.
651 */
652 extern int ref_paranoia;
653
654 /*
655 * The character that begins a commented line in user-editable file
656 * that is subject to stripspace.
657 */
658 extern char comment_line_char;
659 extern int auto_comment_line_char;
660
661 enum branch_track {
662 BRANCH_TRACK_UNSPECIFIED = -1,
663 BRANCH_TRACK_NEVER = 0,
664 BRANCH_TRACK_REMOTE,
665 BRANCH_TRACK_ALWAYS,
666 BRANCH_TRACK_EXPLICIT,
667 BRANCH_TRACK_OVERRIDE
668 };
669
670 enum rebase_setup_type {
671 AUTOREBASE_NEVER = 0,
672 AUTOREBASE_LOCAL,
673 AUTOREBASE_REMOTE,
674 AUTOREBASE_ALWAYS
675 };
676
677 enum push_default_type {
678 PUSH_DEFAULT_NOTHING = 0,
679 PUSH_DEFAULT_MATCHING,
680 PUSH_DEFAULT_SIMPLE,
681 PUSH_DEFAULT_UPSTREAM,
682 PUSH_DEFAULT_CURRENT,
683 PUSH_DEFAULT_UNSPECIFIED
684 };
685
686 extern enum branch_track git_branch_track;
687 extern enum rebase_setup_type autorebase;
688 extern enum push_default_type push_default;
689
690 enum object_creation_mode {
691 OBJECT_CREATION_USES_HARDLINKS = 0,
692 OBJECT_CREATION_USES_RENAMES = 1
693 };
694
695 extern enum object_creation_mode object_creation_mode;
696
697 extern char *notes_ref_name;
698
699 extern int grafts_replace_parents;
700
701 /*
702 * GIT_REPO_VERSION is the version we write by default. The
703 * _READ variant is the highest number we know how to
704 * handle.
705 */
706 #define GIT_REPO_VERSION 0
707 #define GIT_REPO_VERSION_READ 1
708 extern int repository_format_version;
709 extern int repository_format_precious_objects;
710 extern int check_repository_format(void);
711
712 #define MTIME_CHANGED 0x0001
713 #define CTIME_CHANGED 0x0002
714 #define OWNER_CHANGED 0x0004
715 #define MODE_CHANGED 0x0008
716 #define INODE_CHANGED 0x0010
717 #define DATA_CHANGED 0x0020
718 #define TYPE_CHANGED 0x0040
719
720 /*
721 * Return a statically allocated filename, either generically (mkpath), in
722 * the repository directory (git_path), or in a submodule's repository
723 * directory (git_path_submodule). In all cases, note that the result
724 * may be overwritten by another call to _any_ of the functions. Consider
725 * using the safer "dup" or "strbuf" formats below (in some cases, the
726 * unsafe versions have already been removed).
727 */
728 extern const char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
729 extern const char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
730
731 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
732 __attribute__((format (printf, 3, 4)));
733 extern void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
734 __attribute__((format (printf, 2, 3)));
735 extern char *git_path_buf(struct strbuf *buf, const char *fmt, ...)
736 __attribute__((format (printf, 2, 3)));
737 extern void strbuf_git_path_submodule(struct strbuf *sb, const char *path,
738 const char *fmt, ...)
739 __attribute__((format (printf, 3, 4)));
740 extern char *git_pathdup(const char *fmt, ...)
741 __attribute__((format (printf, 1, 2)));
742 extern char *mkpathdup(const char *fmt, ...)
743 __attribute__((format (printf, 1, 2)));
744 extern char *git_pathdup_submodule(const char *path, const char *fmt, ...)
745 __attribute__((format (printf, 2, 3)));
746
747 extern void report_linked_checkout_garbage(void);
748
749 /*
750 * You can define a static memoized git path like:
751 *
752 * static GIT_PATH_FUNC(git_path_foo, "FOO");
753 *
754 * or use one of the global ones below.
755 */
756 #define GIT_PATH_FUNC(func, filename) \
757 const char *func(void) \
758 { \
759 static char *ret; \
760 if (!ret) \
761 ret = git_pathdup(filename); \
762 return ret; \
763 }
764
765 const char *git_path_cherry_pick_head(void);
766 const char *git_path_revert_head(void);
767 const char *git_path_squash_msg(void);
768 const char *git_path_merge_msg(void);
769 const char *git_path_merge_rr(void);
770 const char *git_path_merge_mode(void);
771 const char *git_path_merge_head(void);
772 const char *git_path_fetch_head(void);
773 const char *git_path_shallow(void);
774
775 /*
776 * Return the name of the file in the local object database that would
777 * be used to store a loose object with the specified sha1. The
778 * return value is a pointer to a statically allocated buffer that is
779 * overwritten each time the function is called.
780 */
781 extern const char *sha1_file_name(const unsigned char *sha1);
782
783 /*
784 * Return the name of the (local) packfile with the specified sha1 in
785 * its name. The return value is a pointer to memory that is
786 * overwritten each time this function is called.
787 */
788 extern char *sha1_pack_name(const unsigned char *sha1);
789
790 /*
791 * Return the name of the (local) pack index file with the specified
792 * sha1 in its name. The return value is a pointer to memory that is
793 * overwritten each time this function is called.
794 */
795 extern char *sha1_pack_index_name(const unsigned char *sha1);
796
797 /*
798 * Return an abbreviated sha1 unique within this repository's object database.
799 * The result will be at least `len` characters long, and will be NUL
800 * terminated.
801 *
802 * The non-`_r` version returns a static buffer which will be overwritten by
803 * subsequent calls.
804 *
805 * The `_r` variant writes to a buffer supplied by the caller, which must be at
806 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes
807 * written (excluding the NUL terminator).
808 *
809 * Note that while this version avoids the static buffer, it is not fully
810 * reentrant, as it calls into other non-reentrant git code.
811 */
812 extern const char *find_unique_abbrev(const unsigned char *sha1, int len);
813 extern int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len);
814
815 extern const unsigned char null_sha1[GIT_SHA1_RAWSZ];
816
817 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
818 {
819 int i;
820
821 for (i = 0; i < GIT_SHA1_RAWSZ; i++, sha1++, sha2++) {
822 if (*sha1 != *sha2)
823 return *sha1 - *sha2;
824 }
825
826 return 0;
827 }
828
829 static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2)
830 {
831 return hashcmp(oid1->hash, oid2->hash);
832 }
833
834 static inline int is_null_sha1(const unsigned char *sha1)
835 {
836 return !hashcmp(sha1, null_sha1);
837 }
838
839 static inline int is_null_oid(const struct object_id *oid)
840 {
841 return !hashcmp(oid->hash, null_sha1);
842 }
843
844 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
845 {
846 memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ);
847 }
848
849 static inline void oidcpy(struct object_id *dst, const struct object_id *src)
850 {
851 hashcpy(dst->hash, src->hash);
852 }
853
854 static inline void hashclr(unsigned char *hash)
855 {
856 memset(hash, 0, GIT_SHA1_RAWSZ);
857 }
858
859 static inline void oidclr(struct object_id *oid)
860 {
861 hashclr(oid->hash);
862 }
863
864
865 #define EMPTY_TREE_SHA1_HEX \
866 "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
867 #define EMPTY_TREE_SHA1_BIN_LITERAL \
868 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
869 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
870 #define EMPTY_TREE_SHA1_BIN \
871 ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
872
873 #define EMPTY_BLOB_SHA1_HEX \
874 "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
875 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
876 "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
877 "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
878 #define EMPTY_BLOB_SHA1_BIN \
879 ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
880
881 static inline int is_empty_blob_sha1(const unsigned char *sha1)
882 {
883 return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
884 }
885
886 int git_mkstemp(char *path, size_t n, const char *template);
887
888 int git_mkstemps(char *path, size_t n, const char *template, int suffix_len);
889
890 /* set default permissions by passing mode arguments to open(2) */
891 int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
892 int git_mkstemp_mode(char *pattern, int mode);
893
894 /*
895 * NOTE NOTE NOTE!!
896 *
897 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
898 * not be changed. Old repositories have core.sharedrepository written in
899 * numeric format, and therefore these values are preserved for compatibility
900 * reasons.
901 */
902 enum sharedrepo {
903 PERM_UMASK = 0,
904 OLD_PERM_GROUP = 1,
905 OLD_PERM_EVERYBODY = 2,
906 PERM_GROUP = 0660,
907 PERM_EVERYBODY = 0664
908 };
909 int git_config_perm(const char *var, const char *value);
910 int adjust_shared_perm(const char *path);
911
912 /*
913 * Create the directory containing the named path, using care to be
914 * somewhat safe against races. Return one of the scld_error values
915 * to indicate success/failure.
916 *
917 * SCLD_VANISHED indicates that one of the ancestor directories of the
918 * path existed at one point during the function call and then
919 * suddenly vanished, probably because another process pruned the
920 * directory while we were working. To be robust against this kind of
921 * race, callers might want to try invoking the function again when it
922 * returns SCLD_VANISHED.
923 */
924 enum scld_error {
925 SCLD_OK = 0,
926 SCLD_FAILED = -1,
927 SCLD_PERMS = -2,
928 SCLD_EXISTS = -3,
929 SCLD_VANISHED = -4
930 };
931 enum scld_error safe_create_leading_directories(char *path);
932 enum scld_error safe_create_leading_directories_const(const char *path);
933
934 int mkdir_in_gitdir(const char *path);
935 extern char *expand_user_path(const char *path);
936 const char *enter_repo(const char *path, int strict);
937 static inline int is_absolute_path(const char *path)
938 {
939 return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
940 }
941 int is_directory(const char *);
942 const char *real_path(const char *path);
943 const char *real_path_if_valid(const char *path);
944 const char *absolute_path(const char *path);
945 const char *remove_leading_path(const char *in, const char *prefix);
946 const char *relative_path(const char *in, const char *prefix, struct strbuf *sb);
947 int normalize_path_copy_len(char *dst, const char *src, int *prefix_len);
948 int normalize_path_copy(char *dst, const char *src);
949 int longest_ancestor_length(const char *path, struct string_list *prefixes);
950 char *strip_path_suffix(const char *path, const char *suffix);
951 int daemon_avoid_alias(const char *path);
952 extern int is_ntfs_dotgit(const char *name);
953
954 /**
955 * Return a newly allocated string with the evaluation of
956 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise
957 * "$HOME/.config/git/$filename". Return NULL upon error.
958 */
959 extern char *xdg_config_home(const char *filename);
960
961 /* object replacement */
962 #define LOOKUP_REPLACE_OBJECT 1
963 #define LOOKUP_UNKNOWN_OBJECT 2
964 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
965 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
966 {
967 return read_sha1_file_extended(sha1, type, size, LOOKUP_REPLACE_OBJECT);
968 }
969
970 /*
971 * This internal function is only declared here for the benefit of
972 * lookup_replace_object(). Please do not call it directly.
973 */
974 extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
975
976 /*
977 * If object sha1 should be replaced, return the replacement object's
978 * name (replaced recursively, if necessary). The return value is
979 * either sha1 or a pointer to a permanently-allocated value. When
980 * object replacement is suppressed, always return sha1.
981 */
982 static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
983 {
984 if (!check_replace_refs)
985 return sha1;
986 return do_lookup_replace_object(sha1);
987 }
988
989 static inline const unsigned char *lookup_replace_object_extended(const unsigned char *sha1, unsigned flag)
990 {
991 if (!(flag & LOOKUP_REPLACE_OBJECT))
992 return sha1;
993 return lookup_replace_object(sha1);
994 }
995
996 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
997 extern int sha1_object_info(const unsigned char *, unsigned long *);
998 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
999 extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
1000 extern int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, unsigned char *sha1, unsigned flags);
1001 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
1002 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
1003 extern int git_open_noatime(const char *name);
1004 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
1005 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
1006 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
1007
1008 /* global flag to enable extra checks when accessing packed objects */
1009 extern int do_check_packed_object_crc;
1010
1011 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
1012
1013 extern int finalize_object_file(const char *tmpfile, const char *filename);
1014
1015 extern int has_sha1_pack(const unsigned char *sha1);
1016
1017 /*
1018 * Return true iff we have an object named sha1, whether local or in
1019 * an alternate object database, and whether packed or loose. This
1020 * function does not respect replace references.
1021 *
1022 * If the QUICK flag is set, do not re-check the pack directory
1023 * when we cannot find the object (this means we may give a false
1024 * negative answer if another process is simultaneously repacking).
1025 */
1026 #define HAS_SHA1_QUICK 0x1
1027 extern int has_sha1_file_with_flags(const unsigned char *sha1, int flags);
1028 static inline int has_sha1_file(const unsigned char *sha1)
1029 {
1030 return has_sha1_file_with_flags(sha1, 0);
1031 }
1032
1033 /*
1034 * Return true iff an alternate object database has a loose object
1035 * with the specified name. This function does not respect replace
1036 * references.
1037 */
1038 extern int has_loose_object_nonlocal(const unsigned char *sha1);
1039
1040 extern int has_pack_index(const unsigned char *sha1);
1041
1042 extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
1043
1044 extern const signed char hexval_table[256];
1045 static inline unsigned int hexval(unsigned char c)
1046 {
1047 return hexval_table[c];
1048 }
1049
1050 /* Convert to/from hex/sha1 representation */
1051 #define MINIMUM_ABBREV minimum_abbrev
1052 #define DEFAULT_ABBREV default_abbrev
1053
1054 struct object_context {
1055 unsigned char tree[20];
1056 char path[PATH_MAX];
1057 unsigned mode;
1058 /*
1059 * symlink_path is only used by get_tree_entry_follow_symlinks,
1060 * and only for symlinks that point outside the repository.
1061 */
1062 struct strbuf symlink_path;
1063 };
1064
1065 #define GET_SHA1_QUIETLY 01
1066 #define GET_SHA1_COMMIT 02
1067 #define GET_SHA1_COMMITTISH 04
1068 #define GET_SHA1_TREE 010
1069 #define GET_SHA1_TREEISH 020
1070 #define GET_SHA1_BLOB 040
1071 #define GET_SHA1_FOLLOW_SYMLINKS 0100
1072 #define GET_SHA1_ONLY_TO_DIE 04000
1073
1074 extern int get_sha1(const char *str, unsigned char *sha1);
1075 extern int get_sha1_commit(const char *str, unsigned char *sha1);
1076 extern int get_sha1_committish(const char *str, unsigned char *sha1);
1077 extern int get_sha1_tree(const char *str, unsigned char *sha1);
1078 extern int get_sha1_treeish(const char *str, unsigned char *sha1);
1079 extern int get_sha1_blob(const char *str, unsigned char *sha1);
1080 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
1081 extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
1082
1083 typedef int each_abbrev_fn(const unsigned char *sha1, void *);
1084 extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
1085
1086 /*
1087 * Try to read a SHA1 in hexadecimal format from the 40 characters
1088 * starting at hex. Write the 20-byte result to sha1 in binary form.
1089 * Return 0 on success. Reading stops if a NUL is encountered in the
1090 * input, so it is safe to pass this function an arbitrary
1091 * null-terminated string.
1092 */
1093 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
1094 extern int get_oid_hex(const char *hex, struct object_id *sha1);
1095
1096 /*
1097 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,
1098 * and writes the NUL-terminated output to the buffer `out`, which must be at
1099 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for
1100 * convenience.
1101 *
1102 * The non-`_r` variant returns a static buffer, but uses a ring of 4
1103 * buffers, making it safe to make multiple calls for a single statement, like:
1104 *
1105 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));
1106 */
1107 extern char *sha1_to_hex_r(char *out, const unsigned char *sha1);
1108 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
1109 extern char *oid_to_hex(const struct object_id *oid); /* same static buffer as sha1_to_hex */
1110
1111 extern int interpret_branch_name(const char *str, int len, struct strbuf *);
1112 extern int get_sha1_mb(const char *str, unsigned char *sha1);
1113
1114 extern int validate_headref(const char *ref);
1115
1116 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
1117 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
1118 extern int name_compare(const char *name1, size_t len1, const char *name2, size_t len2);
1119 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
1120
1121 extern void *read_object_with_reference(const unsigned char *sha1,
1122 const char *required_type,
1123 unsigned long *size,
1124 unsigned char *sha1_ret);
1125
1126 extern struct object *peel_to_type(const char *name, int namelen,
1127 struct object *o, enum object_type);
1128
1129 struct date_mode {
1130 enum date_mode_type {
1131 DATE_NORMAL = 0,
1132 DATE_RELATIVE,
1133 DATE_SHORT,
1134 DATE_ISO8601,
1135 DATE_ISO8601_STRICT,
1136 DATE_RFC2822,
1137 DATE_STRFTIME,
1138 DATE_RAW
1139 } type;
1140 const char *strftime_fmt;
1141 int local;
1142 };
1143
1144 /*
1145 * Convenience helper for passing a constant type, like:
1146 *
1147 * show_date(t, tz, DATE_MODE(NORMAL));
1148 */
1149 #define DATE_MODE(t) date_mode_from_type(DATE_##t)
1150 struct date_mode *date_mode_from_type(enum date_mode_type type);
1151
1152 const char *show_date(unsigned long time, int timezone, const struct date_mode *mode);
1153 void show_date_relative(unsigned long time, int tz, const struct timeval *now,
1154 struct strbuf *timebuf);
1155 int parse_date(const char *date, struct strbuf *out);
1156 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
1157 int parse_expiry_date(const char *date, unsigned long *timestamp);
1158 void datestamp(struct strbuf *out);
1159 #define approxidate(s) approxidate_careful((s), NULL)
1160 unsigned long approxidate_careful(const char *, int *);
1161 unsigned long approxidate_relative(const char *date, const struct timeval *now);
1162 void parse_date_format(const char *format, struct date_mode *mode);
1163 int date_overflows(unsigned long date);
1164
1165 #define IDENT_STRICT 1
1166 #define IDENT_NO_DATE 2
1167 #define IDENT_NO_NAME 4
1168 extern const char *git_author_info(int);
1169 extern const char *git_committer_info(int);
1170 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
1171 extern const char *fmt_name(const char *name, const char *email);
1172 extern const char *ident_default_name(void);
1173 extern const char *ident_default_email(void);
1174 extern const char *git_editor(void);
1175 extern const char *git_pager(int stdout_is_tty);
1176 extern int git_ident_config(const char *, const char *, void *);
1177
1178 struct ident_split {
1179 const char *name_begin;
1180 const char *name_end;
1181 const char *mail_begin;
1182 const char *mail_end;
1183 const char *date_begin;
1184 const char *date_end;
1185 const char *tz_begin;
1186 const char *tz_end;
1187 };
1188 /*
1189 * Signals an success with 0, but time part of the result may be NULL
1190 * if the input lacks timestamp and zone
1191 */
1192 extern int split_ident_line(struct ident_split *, const char *, int);
1193
1194 /*
1195 * Like show_date, but pull the timestamp and tz parameters from
1196 * the ident_split. It will also sanity-check the values and produce
1197 * a well-known sentinel date if they appear bogus.
1198 */
1199 const char *show_ident_date(const struct ident_split *id,
1200 const struct date_mode *mode);
1201
1202 /*
1203 * Compare split idents for equality or strict ordering. Note that we
1204 * compare only the ident part of the line, ignoring any timestamp.
1205 *
1206 * Because there are two fields, we must choose one as the primary key; we
1207 * currently arbitrarily pick the email.
1208 */
1209 extern int ident_cmp(const struct ident_split *, const struct ident_split *);
1210
1211 struct checkout {
1212 struct index_state *istate;
1213 const char *base_dir;
1214 int base_dir_len;
1215 unsigned force:1,
1216 quiet:1,
1217 not_new:1,
1218 refresh_cache:1;
1219 };
1220
1221 #define TEMPORARY_FILENAME_LENGTH 25
1222 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
1223
1224 struct cache_def {
1225 struct strbuf path;
1226 int flags;
1227 int track_flags;
1228 int prefix_len_stat_func;
1229 };
1230 #define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }
1231 static inline void cache_def_clear(struct cache_def *cache)
1232 {
1233 strbuf_release(&cache->path);
1234 }
1235
1236 extern int has_symlink_leading_path(const char *name, int len);
1237 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
1238 extern int check_leading_path(const char *name, int len);
1239 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
1240 extern void schedule_dir_for_removal(const char *name, int len);
1241 extern void remove_scheduled_dirs(void);
1242
1243 extern struct alternate_object_database {
1244 struct alternate_object_database *next;
1245 char *name;
1246 char base[FLEX_ARRAY]; /* more */
1247 } *alt_odb_list;
1248 extern void prepare_alt_odb(void);
1249 extern void read_info_alternates(const char * relative_base, int depth);
1250 extern void add_to_alternates_file(const char *reference);
1251 typedef int alt_odb_fn(struct alternate_object_database *, void *);
1252 extern int foreach_alt_odb(alt_odb_fn, void*);
1253
1254 struct pack_window {
1255 struct pack_window *next;
1256 unsigned char *base;
1257 off_t offset;
1258 size_t len;
1259 unsigned int last_used;
1260 unsigned int inuse_cnt;
1261 };
1262
1263 extern struct packed_git {
1264 struct packed_git *next;
1265 struct pack_window *windows;
1266 off_t pack_size;
1267 const void *index_data;
1268 size_t index_size;
1269 uint32_t num_objects;
1270 uint32_t num_bad_objects;
1271 unsigned char *bad_object_sha1;
1272 int index_version;
1273 time_t mtime;
1274 int pack_fd;
1275 unsigned pack_local:1,
1276 pack_keep:1,
1277 freshened:1,
1278 do_not_close:1;
1279 unsigned char sha1[20];
1280 /* something like ".git/objects/pack/xxxxx.pack" */
1281 char pack_name[FLEX_ARRAY]; /* more */
1282 } *packed_git;
1283
1284 struct pack_entry {
1285 off_t offset;
1286 unsigned char sha1[20];
1287 struct packed_git *p;
1288 };
1289
1290 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1291
1292 /* A hook for count-objects to report invalid files in pack directory */
1293 extern void (*report_garbage)(const char *desc, const char *path);
1294
1295 extern void prepare_packed_git(void);
1296 extern void reprepare_packed_git(void);
1297 extern void install_packed_git(struct packed_git *pack);
1298
1299 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1300 struct packed_git *packs);
1301
1302 extern void pack_report(void);
1303
1304 /*
1305 * mmap the index file for the specified packfile (if it is not
1306 * already mmapped). Return 0 on success.
1307 */
1308 extern int open_pack_index(struct packed_git *);
1309
1310 /*
1311 * munmap the index file for the specified packfile (if it is
1312 * currently mmapped).
1313 */
1314 extern void close_pack_index(struct packed_git *);
1315
1316 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1317 extern void close_pack_windows(struct packed_git *);
1318 extern void close_all_packs(void);
1319 extern void unuse_pack(struct pack_window **);
1320 extern void free_pack_by_name(const char *);
1321 extern void clear_delta_base_cache(void);
1322 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
1323
1324 /*
1325 * Return the SHA-1 of the nth object within the specified packfile.
1326 * Open the index if it is not already open. The return value points
1327 * at the SHA-1 within the mmapped index. Return NULL if there is an
1328 * error.
1329 */
1330 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
1331
1332 /*
1333 * Return the offset of the nth object within the specified packfile.
1334 * The index must already be opened.
1335 */
1336 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
1337
1338 /*
1339 * If the object named sha1 is present in the specified packfile,
1340 * return its offset within the packfile; otherwise, return 0.
1341 */
1342 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
1343
1344 extern int is_pack_valid(struct packed_git *);
1345 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1346 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1347 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1348 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1349
1350 /*
1351 * Iterate over the files in the loose-object parts of the object
1352 * directory "path", triggering the following callbacks:
1353 *
1354 * - loose_object is called for each loose object we find.
1355 *
1356 * - loose_cruft is called for any files that do not appear to be
1357 * loose objects. Note that we only look in the loose object
1358 * directories "objects/[0-9a-f]{2}/", so we will not report
1359 * "objects/foobar" as cruft.
1360 *
1361 * - loose_subdir is called for each top-level hashed subdirectory
1362 * of the object directory (e.g., "$OBJDIR/f0"). It is called
1363 * after the objects in the directory are processed.
1364 *
1365 * Any callback that is NULL will be ignored. Callbacks returning non-zero
1366 * will end the iteration.
1367 *
1368 * In the "buf" variant, "path" is a strbuf which will also be used as a
1369 * scratch buffer, but restored to its original contents before
1370 * the function returns.
1371 */
1372 typedef int each_loose_object_fn(const unsigned char *sha1,
1373 const char *path,
1374 void *data);
1375 typedef int each_loose_cruft_fn(const char *basename,
1376 const char *path,
1377 void *data);
1378 typedef int each_loose_subdir_fn(int nr,
1379 const char *path,
1380 void *data);
1381 int for_each_loose_file_in_objdir(const char *path,
1382 each_loose_object_fn obj_cb,
1383 each_loose_cruft_fn cruft_cb,
1384 each_loose_subdir_fn subdir_cb,
1385 void *data);
1386 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
1387 each_loose_object_fn obj_cb,
1388 each_loose_cruft_fn cruft_cb,
1389 each_loose_subdir_fn subdir_cb,
1390 void *data);
1391
1392 /*
1393 * Iterate over loose and packed objects in both the local
1394 * repository and any alternates repositories (unless the
1395 * LOCAL_ONLY flag is set).
1396 */
1397 #define FOR_EACH_OBJECT_LOCAL_ONLY 0x1
1398 typedef int each_packed_object_fn(const unsigned char *sha1,
1399 struct packed_git *pack,
1400 uint32_t pos,
1401 void *data);
1402 extern int for_each_loose_object(each_loose_object_fn, void *, unsigned flags);
1403 extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
1404
1405 struct object_info {
1406 /* Request */
1407 enum object_type *typep;
1408 unsigned long *sizep;
1409 unsigned long *disk_sizep;
1410 unsigned char *delta_base_sha1;
1411 struct strbuf *typename;
1412
1413 /* Response */
1414 enum {
1415 OI_CACHED,
1416 OI_LOOSE,
1417 OI_PACKED,
1418 OI_DBCACHED
1419 } whence;
1420 union {
1421 /*
1422 * struct {
1423 * ... Nothing to expose in this case
1424 * } cached;
1425 * struct {
1426 * ... Nothing to expose in this case
1427 * } loose;
1428 */
1429 struct {
1430 struct packed_git *pack;
1431 off_t offset;
1432 unsigned int is_delta;
1433 } packed;
1434 } u;
1435 };
1436 extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
1437
1438 /* Dumb servers support */
1439 extern int update_server_info(int);
1440
1441 /* git_config_parse_key() returns these negated: */
1442 #define CONFIG_INVALID_KEY 1
1443 #define CONFIG_NO_SECTION_OR_NAME 2
1444 /* git_config_set(), git_config_set_multivar() return the above or these: */
1445 #define CONFIG_NO_LOCK -1
1446 #define CONFIG_INVALID_FILE 3
1447 #define CONFIG_NO_WRITE 4
1448 #define CONFIG_NOTHING_SET 5
1449 #define CONFIG_INVALID_PATTERN 6
1450 #define CONFIG_GENERIC_ERROR 7
1451
1452 #define CONFIG_REGEX_NONE ((void *)1)
1453
1454 struct git_config_source {
1455 unsigned int use_stdin:1;
1456 const char *file;
1457 const char *blob;
1458 };
1459
1460 typedef int (*config_fn_t)(const char *, const char *, void *);
1461 extern int git_default_config(const char *, const char *, void *);
1462 extern int git_config_from_file(config_fn_t fn, const char *, void *);
1463 extern int git_config_from_buf(config_fn_t fn, const char *name,
1464 const char *buf, size_t len, void *data);
1465 extern void git_config_push_parameter(const char *text);
1466 extern int git_config_from_parameters(config_fn_t fn, void *data);
1467 extern void git_config(config_fn_t fn, void *);
1468 extern int git_config_with_options(config_fn_t fn, void *,
1469 struct git_config_source *config_source,
1470 int respect_includes);
1471 extern int git_config_early(config_fn_t fn, void *, const char *repo_config);
1472 extern int git_parse_ulong(const char *, unsigned long *);
1473 extern int git_parse_maybe_bool(const char *);
1474 extern int git_config_int(const char *, const char *);
1475 extern int64_t git_config_int64(const char *, const char *);
1476 extern unsigned long git_config_ulong(const char *, const char *);
1477 extern int git_config_bool_or_int(const char *, const char *, int *);
1478 extern int git_config_bool(const char *, const char *);
1479 extern int git_config_maybe_bool(const char *, const char *);
1480 extern int git_config_string(const char **, const char *, const char *);
1481 extern int git_config_pathname(const char **, const char *, const char *);
1482 extern int git_config_set_in_file(const char *, const char *, const char *);
1483 extern int git_config_set(const char *, const char *);
1484 extern int git_config_parse_key(const char *, char **, int *);
1485 extern int git_config_key_is_valid(const char *key);
1486 extern int git_config_set_multivar(const char *, const char *, const char *, int);
1487 extern int git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1488 extern int git_config_rename_section(const char *, const char *);
1489 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1490 extern const char *git_etc_gitconfig(void);
1491 extern int check_repository_format_version(const char *var, const char *value, void *cb);
1492 extern int git_env_bool(const char *, int);
1493 extern unsigned long git_env_ulong(const char *, unsigned long);
1494 extern int git_config_system(void);
1495 extern int config_error_nonbool(const char *);
1496 #if defined(__GNUC__)
1497 #define config_error_nonbool(s) (config_error_nonbool(s), const_error())
1498 #endif
1499 extern const char *get_log_output_encoding(void);
1500 extern const char *get_commit_output_encoding(void);
1501
1502 extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1503
1504 struct config_include_data {
1505 int depth;
1506 config_fn_t fn;
1507 void *data;
1508 };
1509 #define CONFIG_INCLUDE_INIT { 0 }
1510 extern int git_config_include(const char *name, const char *value, void *data);
1511
1512 /*
1513 * Match and parse a config key of the form:
1514 *
1515 * section.(subsection.)?key
1516 *
1517 * (i.e., what gets handed to a config_fn_t). The caller provides the section;
1518 * we return -1 if it does not match, 0 otherwise. The subsection and key
1519 * out-parameters are filled by the function (and subsection is NULL if it is
1520 * missing).
1521 */
1522 extern int parse_config_key(const char *var,
1523 const char *section,
1524 const char **subsection, int *subsection_len,
1525 const char **key);
1526
1527 struct config_set_element {
1528 struct hashmap_entry ent;
1529 char *key;
1530 struct string_list value_list;
1531 };
1532
1533 struct configset_list_item {
1534 struct config_set_element *e;
1535 int value_index;
1536 };
1537
1538 /*
1539 * the contents of the list are ordered according to their
1540 * position in the config files and order of parsing the files.
1541 * (i.e. key-value pair at the last position of .git/config will
1542 * be at the last item of the list)
1543 */
1544 struct configset_list {
1545 struct configset_list_item *items;
1546 unsigned int nr, alloc;
1547 };
1548
1549 struct config_set {
1550 struct hashmap config_hash;
1551 int hash_initialized;
1552 struct configset_list list;
1553 };
1554
1555 extern void git_configset_init(struct config_set *cs);
1556 extern int git_configset_add_file(struct config_set *cs, const char *filename);
1557 extern int git_configset_get_value(struct config_set *cs, const char *key, const char **value);
1558 extern const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key);
1559 extern void git_configset_clear(struct config_set *cs);
1560 extern int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest);
1561 extern int git_configset_get_string(struct config_set *cs, const char *key, char **dest);
1562 extern int git_configset_get_int(struct config_set *cs, const char *key, int *dest);
1563 extern int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest);
1564 extern int git_configset_get_bool(struct config_set *cs, const char *key, int *dest);
1565 extern int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest);
1566 extern int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest);
1567 extern int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest);
1568
1569 extern int git_config_get_value(const char *key, const char **value);
1570 extern const struct string_list *git_config_get_value_multi(const char *key);
1571 extern void git_config_clear(void);
1572 extern void git_config_iter(config_fn_t fn, void *data);
1573 extern int git_config_get_string_const(const char *key, const char **dest);
1574 extern int git_config_get_string(const char *key, char **dest);
1575 extern int git_config_get_int(const char *key, int *dest);
1576 extern int git_config_get_ulong(const char *key, unsigned long *dest);
1577 extern int git_config_get_bool(const char *key, int *dest);
1578 extern int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
1579 extern int git_config_get_maybe_bool(const char *key, int *dest);
1580 extern int git_config_get_pathname(const char *key, const char **dest);
1581
1582 struct key_value_info {
1583 const char *filename;
1584 int linenr;
1585 };
1586
1587 extern NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3)));
1588 extern NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr);
1589
1590 extern int committer_ident_sufficiently_given(void);
1591 extern int author_ident_sufficiently_given(void);
1592
1593 extern const char *git_commit_encoding;
1594 extern const char *git_log_output_encoding;
1595 extern const char *git_mailmap_file;
1596 extern const char *git_mailmap_blob;
1597
1598 /* IO helper functions */
1599 extern void maybe_flush_or_die(FILE *, const char *);
1600 __attribute__((format (printf, 2, 3)))
1601 extern void fprintf_or_die(FILE *, const char *fmt, ...);
1602
1603 #define COPY_READ_ERROR (-2)
1604 #define COPY_WRITE_ERROR (-3)
1605 extern int copy_fd(int ifd, int ofd);
1606 extern int copy_file(const char *dst, const char *src, int mode);
1607 extern int copy_file_with_time(const char *dst, const char *src, int mode);
1608
1609 extern void write_or_die(int fd, const void *buf, size_t count);
1610 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1611 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1612 extern void fsync_or_die(int fd, const char *);
1613
1614 extern ssize_t read_in_full(int fd, void *buf, size_t count);
1615 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1616 extern ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset);
1617
1618 static inline ssize_t write_str_in_full(int fd, const char *str)
1619 {
1620 return write_in_full(fd, str, strlen(str));
1621 }
1622
1623 extern int write_file(const char *path, const char *fmt, ...);
1624 extern int write_file_gently(const char *path, const char *fmt, ...);
1625
1626 /* pager.c */
1627 extern void setup_pager(void);
1628 extern const char *pager_program;
1629 extern int pager_in_use(void);
1630 extern int pager_use_color;
1631 extern int term_columns(void);
1632 extern int decimal_width(uintmax_t);
1633 extern int check_pager_config(const char *cmd);
1634
1635 extern const char *editor_program;
1636 extern const char *askpass_program;
1637 extern const char *excludes_file;
1638
1639 /* base85 */
1640 int decode_85(char *dst, const char *line, int linelen);
1641 void encode_85(char *buf, const unsigned char *data, int bytes);
1642
1643 /* alloc.c */
1644 extern void *alloc_blob_node(void);
1645 extern void *alloc_tree_node(void);
1646 extern void *alloc_commit_node(void);
1647 extern void *alloc_tag_node(void);
1648 extern void *alloc_object_node(void);
1649 extern void alloc_report(void);
1650 extern unsigned int alloc_commit_index(void);
1651
1652 /* pkt-line.c */
1653 void packet_trace_identity(const char *prog);
1654
1655 /* add */
1656 /*
1657 * return 0 if success, 1 - if addition of a file failed and
1658 * ADD_FILES_IGNORE_ERRORS was specified in flags
1659 */
1660 int add_files_to_cache(const char *prefix, const struct pathspec *pathspec, int flags);
1661
1662 /* diff.c */
1663 extern int diff_auto_refresh_index;
1664
1665 /* match-trees.c */
1666 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1667 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1668
1669 /*
1670 * whitespace rules.
1671 * used by both diff and apply
1672 * last two digits are tab width
1673 */
1674 #define WS_BLANK_AT_EOL 0100
1675 #define WS_SPACE_BEFORE_TAB 0200
1676 #define WS_INDENT_WITH_NON_TAB 0400
1677 #define WS_CR_AT_EOL 01000
1678 #define WS_BLANK_AT_EOF 02000
1679 #define WS_TAB_IN_INDENT 04000
1680 #define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1681 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1682 #define WS_TAB_WIDTH_MASK 077
1683 extern unsigned whitespace_rule_cfg;
1684 extern unsigned whitespace_rule(const char *);
1685 extern unsigned parse_whitespace_rule(const char *);
1686 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1687 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1688 extern char *whitespace_error_string(unsigned ws);
1689 extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1690 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1691 #define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)
1692
1693 /* ls-files */
1694 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1695
1696 char *alias_lookup(const char *alias);
1697 int split_cmdline(char *cmdline, const char ***argv);
1698 /* Takes a negative value returned by split_cmdline */
1699 const char *split_cmdline_strerror(int cmdline_errno);
1700
1701 /* git.c */
1702 struct startup_info {
1703 int have_repository;
1704 const char *prefix;
1705 };
1706 extern struct startup_info *startup_info;
1707
1708 /* merge.c */
1709 struct commit_list;
1710 int try_merge_command(const char *strategy, size_t xopts_nr,
1711 const char **xopts, struct commit_list *common,
1712 const char *head_arg, struct commit_list *remotes);
1713 int checkout_fast_forward(const unsigned char *from,
1714 const unsigned char *to,
1715 int overwrite_ignore);
1716
1717
1718 int sane_execvp(const char *file, char *const argv[]);
1719
1720 /*
1721 * A struct to encapsulate the concept of whether a file has changed
1722 * since we last checked it. This uses criteria similar to those used
1723 * for the index.
1724 */
1725 struct stat_validity {
1726 struct stat_data *sd;
1727 };
1728
1729 void stat_validity_clear(struct stat_validity *sv);
1730
1731 /*
1732 * Returns 1 if the path is a regular file (or a symlink to a regular
1733 * file) and matches the saved stat_validity, 0 otherwise. A missing
1734 * or inaccessible file is considered a match if the struct was just
1735 * initialized, or if the previous update found an inaccessible file.
1736 */
1737 int stat_validity_check(struct stat_validity *sv, const char *path);
1738
1739 /*
1740 * Update the stat_validity from a file opened at descriptor fd. If
1741 * the file is missing, inaccessible, or not a regular file, then
1742 * future calls to stat_validity_check will match iff one of those
1743 * conditions continues to be true.
1744 */
1745 void stat_validity_update(struct stat_validity *sv, int fd);
1746
1747 int versioncmp(const char *s1, const char *s2);
1748 void sleep_millisec(int millisec);
1749
1750 #endif /* CACHE_H */