Git 2.8.6
[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 #include "pack-revindex.h"
13
14 #include SHA1_HEADER
15 #ifndef platform_SHA_CTX
16 /*
17 * platform's underlying implementation of SHA-1; could be OpenSSL,
18 * blk_SHA, Apple CommonCrypto, etc... Note that including
19 * SHA1_HEADER may have already defined platform_SHA_CTX for our
20 * own implementations like block-sha1 and ppc-sha1, so we list
21 * the default for OpenSSL compatible SHA-1 implementations here.
22 */
23 #define platform_SHA_CTX SHA_CTX
24 #define platform_SHA1_Init SHA1_Init
25 #define platform_SHA1_Update SHA1_Update
26 #define platform_SHA1_Final SHA1_Final
27 #endif
28
29 #define git_SHA_CTX platform_SHA_CTX
30 #define git_SHA1_Init platform_SHA1_Init
31 #define git_SHA1_Update platform_SHA1_Update
32 #define git_SHA1_Final platform_SHA1_Final
33
34 #ifdef SHA1_MAX_BLOCK_SIZE
35 #include "compat/sha1-chunked.h"
36 #undef git_SHA1_Update
37 #define git_SHA1_Update git_SHA1_Update_Chunked
38 #endif
39
40 #include <zlib.h>
41 typedef struct git_zstream {
42 z_stream z;
43 unsigned long avail_in;
44 unsigned long avail_out;
45 unsigned long total_in;
46 unsigned long total_out;
47 unsigned char *next_in;
48 unsigned char *next_out;
49 } git_zstream;
50
51 void git_inflate_init(git_zstream *);
52 void git_inflate_init_gzip_only(git_zstream *);
53 void git_inflate_end(git_zstream *);
54 int git_inflate(git_zstream *, int flush);
55
56 void git_deflate_init(git_zstream *, int level);
57 void git_deflate_init_gzip(git_zstream *, int level);
58 void git_deflate_init_raw(git_zstream *, int level);
59 void git_deflate_end(git_zstream *);
60 int git_deflate_abort(git_zstream *);
61 int git_deflate_end_gently(git_zstream *);
62 int git_deflate(git_zstream *, int flush);
63 unsigned long git_deflate_bound(git_zstream *, unsigned long);
64
65 /* The length in bytes and in hex digits of an object name (SHA-1 value). */
66 #define GIT_SHA1_RAWSZ 20
67 #define GIT_SHA1_HEXSZ (2 * GIT_SHA1_RAWSZ)
68
69 struct object_id {
70 unsigned char hash[GIT_SHA1_RAWSZ];
71 };
72
73 #if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
74 #define DTYPE(de) ((de)->d_type)
75 #else
76 #undef DT_UNKNOWN
77 #undef DT_DIR
78 #undef DT_REG
79 #undef DT_LNK
80 #define DT_UNKNOWN 0
81 #define DT_DIR 1
82 #define DT_REG 2
83 #define DT_LNK 3
84 #define DTYPE(de) DT_UNKNOWN
85 #endif
86
87 /* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
88 #define S_IFINVALID 0030000
89
90 /*
91 * A "directory link" is a link to another git directory.
92 *
93 * The value 0160000 is not normally a valid mode, and
94 * also just happens to be S_IFDIR + S_IFLNK
95 */
96 #define S_IFGITLINK 0160000
97 #define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
98
99 /*
100 * Some mode bits are also used internally for computations.
101 *
102 * They *must* not overlap with any valid modes, and they *must* not be emitted
103 * to outside world - i.e. appear on disk or network. In other words, it's just
104 * temporary fields, which we internally use, but they have to stay in-house.
105 *
106 * ( such approach is valid, as standard S_IF* fits into 16 bits, and in Git
107 * codebase mode is `unsigned int` which is assumed to be at least 32 bits )
108 */
109
110 /* used internally in tree-diff */
111 #define S_DIFFTREE_IFXMIN_NEQ 0x80000000
112
113
114 /*
115 * Intensive research over the course of many years has shown that
116 * port 9418 is totally unused by anything else. Or
117 *
118 * Your search - "port 9418" - did not match any documents.
119 *
120 * as www.google.com puts it.
121 *
122 * This port has been properly assigned for git use by IANA:
123 * git (Assigned-9418) [I06-050728-0001].
124 *
125 * git 9418/tcp git pack transfer service
126 * git 9418/udp git pack transfer service
127 *
128 * with Linus Torvalds <torvalds@osdl.org> as the point of
129 * contact. September 2005.
130 *
131 * See http://www.iana.org/assignments/port-numbers
132 */
133 #define DEFAULT_GIT_PORT 9418
134
135 /*
136 * Basic data structures for the directory cache
137 */
138
139 #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
140 struct cache_header {
141 uint32_t hdr_signature;
142 uint32_t hdr_version;
143 uint32_t hdr_entries;
144 };
145
146 #define INDEX_FORMAT_LB 2
147 #define INDEX_FORMAT_UB 4
148
149 /*
150 * The "cache_time" is just the low 32 bits of the
151 * time. It doesn't matter if it overflows - we only
152 * check it for equality in the 32 bits we save.
153 */
154 struct cache_time {
155 uint32_t sec;
156 uint32_t nsec;
157 };
158
159 struct stat_data {
160 struct cache_time sd_ctime;
161 struct cache_time sd_mtime;
162 unsigned int sd_dev;
163 unsigned int sd_ino;
164 unsigned int sd_uid;
165 unsigned int sd_gid;
166 unsigned int sd_size;
167 };
168
169 struct cache_entry {
170 struct hashmap_entry ent;
171 struct stat_data ce_stat_data;
172 unsigned int ce_mode;
173 unsigned int ce_flags;
174 unsigned int ce_namelen;
175 unsigned int index; /* for link extension */
176 unsigned char sha1[20];
177 char name[FLEX_ARRAY]; /* more */
178 };
179
180 #define CE_STAGEMASK (0x3000)
181 #define CE_EXTENDED (0x4000)
182 #define CE_VALID (0x8000)
183 #define CE_STAGESHIFT 12
184
185 /*
186 * Range 0xFFFF0FFF in ce_flags is divided into
187 * two parts: in-memory flags and on-disk ones.
188 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
189 * if you want to save a new flag, add it in
190 * CE_EXTENDED_FLAGS
191 *
192 * In-memory only flags
193 */
194 #define CE_UPDATE (1 << 16)
195 #define CE_REMOVE (1 << 17)
196 #define CE_UPTODATE (1 << 18)
197 #define CE_ADDED (1 << 19)
198
199 #define CE_HASHED (1 << 20)
200 #define CE_WT_REMOVE (1 << 22) /* remove in work directory */
201 #define CE_CONFLICTED (1 << 23)
202
203 #define CE_UNPACKED (1 << 24)
204 #define CE_NEW_SKIP_WORKTREE (1 << 25)
205
206 /* used to temporarily mark paths matched by pathspecs */
207 #define CE_MATCHED (1 << 26)
208
209 #define CE_UPDATE_IN_BASE (1 << 27)
210 #define CE_STRIP_NAME (1 << 28)
211
212 /*
213 * Extended on-disk flags
214 */
215 #define CE_INTENT_TO_ADD (1 << 29)
216 #define CE_SKIP_WORKTREE (1 << 30)
217 /* CE_EXTENDED2 is for future extension */
218 #define CE_EXTENDED2 (1U << 31)
219
220 #define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD | CE_SKIP_WORKTREE)
221
222 /*
223 * Safeguard to avoid saving wrong flags:
224 * - CE_EXTENDED2 won't get saved until its semantic is known
225 * - Bits in 0x0000FFFF have been saved in ce_flags already
226 * - Bits in 0x003F0000 are currently in-memory flags
227 */
228 #if CE_EXTENDED_FLAGS & 0x803FFFFF
229 #error "CE_EXTENDED_FLAGS out of range"
230 #endif
231
232 /* Forward structure decls */
233 struct pathspec;
234 struct child_process;
235
236 /*
237 * Copy the sha1 and stat state of a cache entry from one to
238 * another. But we never change the name, or the hash state!
239 */
240 static inline void copy_cache_entry(struct cache_entry *dst,
241 const struct cache_entry *src)
242 {
243 unsigned int state = dst->ce_flags & CE_HASHED;
244
245 /* Don't copy hash chain and name */
246 memcpy(&dst->ce_stat_data, &src->ce_stat_data,
247 offsetof(struct cache_entry, name) -
248 offsetof(struct cache_entry, ce_stat_data));
249
250 /* Restore the hash state */
251 dst->ce_flags = (dst->ce_flags & ~CE_HASHED) | state;
252 }
253
254 static inline unsigned create_ce_flags(unsigned stage)
255 {
256 return (stage << CE_STAGESHIFT);
257 }
258
259 #define ce_namelen(ce) ((ce)->ce_namelen)
260 #define ce_size(ce) cache_entry_size(ce_namelen(ce))
261 #define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
262 #define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
263 #define ce_skip_worktree(ce) ((ce)->ce_flags & CE_SKIP_WORKTREE)
264 #define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
265 #define ce_intent_to_add(ce) ((ce)->ce_flags & CE_INTENT_TO_ADD)
266
267 #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
268 static inline unsigned int create_ce_mode(unsigned int mode)
269 {
270 if (S_ISLNK(mode))
271 return S_IFLNK;
272 if (S_ISDIR(mode) || S_ISGITLINK(mode))
273 return S_IFGITLINK;
274 return S_IFREG | ce_permissions(mode);
275 }
276 static inline unsigned int ce_mode_from_stat(const struct cache_entry *ce,
277 unsigned int mode)
278 {
279 extern int trust_executable_bit, has_symlinks;
280 if (!has_symlinks && S_ISREG(mode) &&
281 ce && S_ISLNK(ce->ce_mode))
282 return ce->ce_mode;
283 if (!trust_executable_bit && S_ISREG(mode)) {
284 if (ce && S_ISREG(ce->ce_mode))
285 return ce->ce_mode;
286 return create_ce_mode(0666);
287 }
288 return create_ce_mode(mode);
289 }
290 static inline int ce_to_dtype(const struct cache_entry *ce)
291 {
292 unsigned ce_mode = ntohl(ce->ce_mode);
293 if (S_ISREG(ce_mode))
294 return DT_REG;
295 else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
296 return DT_DIR;
297 else if (S_ISLNK(ce_mode))
298 return DT_LNK;
299 else
300 return DT_UNKNOWN;
301 }
302 static inline unsigned int canon_mode(unsigned int mode)
303 {
304 if (S_ISREG(mode))
305 return S_IFREG | ce_permissions(mode);
306 if (S_ISLNK(mode))
307 return S_IFLNK;
308 if (S_ISDIR(mode))
309 return S_IFDIR;
310 return S_IFGITLINK;
311 }
312
313 #define cache_entry_size(len) (offsetof(struct cache_entry,name) + (len) + 1)
314
315 #define SOMETHING_CHANGED (1 << 0) /* unclassified changes go here */
316 #define CE_ENTRY_CHANGED (1 << 1)
317 #define CE_ENTRY_REMOVED (1 << 2)
318 #define CE_ENTRY_ADDED (1 << 3)
319 #define RESOLVE_UNDO_CHANGED (1 << 4)
320 #define CACHE_TREE_CHANGED (1 << 5)
321 #define SPLIT_INDEX_ORDERED (1 << 6)
322 #define UNTRACKED_CHANGED (1 << 7)
323
324 struct split_index;
325 struct untracked_cache;
326
327 struct index_state {
328 struct cache_entry **cache;
329 unsigned int version;
330 unsigned int cache_nr, cache_alloc, cache_changed;
331 struct string_list *resolve_undo;
332 struct cache_tree *cache_tree;
333 struct split_index *split_index;
334 struct cache_time timestamp;
335 unsigned name_hash_initialized : 1,
336 initialized : 1;
337 struct hashmap name_hash;
338 struct hashmap dir_hash;
339 unsigned char sha1[20];
340 struct untracked_cache *untracked;
341 };
342
343 extern struct index_state the_index;
344
345 /* Name hashing */
346 extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
347 extern void remove_name_hash(struct index_state *istate, struct cache_entry *ce);
348 extern void free_name_hash(struct index_state *istate);
349
350
351 #ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
352 #define active_cache (the_index.cache)
353 #define active_nr (the_index.cache_nr)
354 #define active_alloc (the_index.cache_alloc)
355 #define active_cache_changed (the_index.cache_changed)
356 #define active_cache_tree (the_index.cache_tree)
357
358 #define read_cache() read_index(&the_index)
359 #define read_cache_from(path) read_index_from(&the_index, (path))
360 #define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
361 #define is_cache_unborn() is_index_unborn(&the_index)
362 #define read_cache_unmerged() read_index_unmerged(&the_index)
363 #define discard_cache() discard_index(&the_index)
364 #define unmerged_cache() unmerged_index(&the_index)
365 #define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
366 #define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
367 #define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
368 #define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
369 #define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
370 #define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
371 #define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
372 #define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL, NULL)
373 #define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
374 #define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
375 #define cache_dir_exists(name, namelen) index_dir_exists(&the_index, (name), (namelen))
376 #define cache_file_exists(name, namelen, igncase) index_file_exists(&the_index, (name), (namelen), (igncase))
377 #define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
378 #define resolve_undo_clear() resolve_undo_clear_index(&the_index)
379 #define unmerge_cache_entry_at(at) unmerge_index_entry_at(&the_index, at)
380 #define unmerge_cache(pathspec) unmerge_index(&the_index, pathspec)
381 #define read_blob_data_from_cache(path, sz) read_blob_data_from_index(&the_index, (path), (sz))
382 #endif
383
384 enum object_type {
385 OBJ_BAD = -1,
386 OBJ_NONE = 0,
387 OBJ_COMMIT = 1,
388 OBJ_TREE = 2,
389 OBJ_BLOB = 3,
390 OBJ_TAG = 4,
391 /* 5 for future expansion */
392 OBJ_OFS_DELTA = 6,
393 OBJ_REF_DELTA = 7,
394 OBJ_ANY,
395 OBJ_MAX
396 };
397
398 static inline enum object_type object_type(unsigned int mode)
399 {
400 return S_ISDIR(mode) ? OBJ_TREE :
401 S_ISGITLINK(mode) ? OBJ_COMMIT :
402 OBJ_BLOB;
403 }
404
405 /* Double-check local_repo_env below if you add to this list. */
406 #define GIT_DIR_ENVIRONMENT "GIT_DIR"
407 #define GIT_COMMON_DIR_ENVIRONMENT "GIT_COMMON_DIR"
408 #define GIT_NAMESPACE_ENVIRONMENT "GIT_NAMESPACE"
409 #define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
410 #define GIT_PREFIX_ENVIRONMENT "GIT_PREFIX"
411 #define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
412 #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
413 #define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
414 #define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
415 #define GIT_SHALLOW_FILE_ENVIRONMENT "GIT_SHALLOW_FILE"
416 #define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
417 #define CONFIG_ENVIRONMENT "GIT_CONFIG"
418 #define CONFIG_DATA_ENVIRONMENT "GIT_CONFIG_PARAMETERS"
419 #define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
420 #define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
421 #define NO_REPLACE_OBJECTS_ENVIRONMENT "GIT_NO_REPLACE_OBJECTS"
422 #define GIT_REPLACE_REF_BASE_ENVIRONMENT "GIT_REPLACE_REF_BASE"
423 #define GITATTRIBUTES_FILE ".gitattributes"
424 #define INFOATTRIBUTES_FILE "info/attributes"
425 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
426 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
427 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
428 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
429 #define GIT_NOTES_REWRITE_REF_ENVIRONMENT "GIT_NOTES_REWRITE_REF"
430 #define GIT_NOTES_REWRITE_MODE_ENVIRONMENT "GIT_NOTES_REWRITE_MODE"
431 #define GIT_LITERAL_PATHSPECS_ENVIRONMENT "GIT_LITERAL_PATHSPECS"
432 #define GIT_GLOB_PATHSPECS_ENVIRONMENT "GIT_GLOB_PATHSPECS"
433 #define GIT_NOGLOB_PATHSPECS_ENVIRONMENT "GIT_NOGLOB_PATHSPECS"
434 #define GIT_ICASE_PATHSPECS_ENVIRONMENT "GIT_ICASE_PATHSPECS"
435
436 /*
437 * This environment variable is expected to contain a boolean indicating
438 * whether we should or should not treat:
439 *
440 * GIT_DIR=foo.git git ...
441 *
442 * as if GIT_WORK_TREE=. was given. It's not expected that users will make use
443 * of this, but we use it internally to communicate to sub-processes that we
444 * are in a bare repo. If not set, defaults to true.
445 */
446 #define GIT_IMPLICIT_WORK_TREE_ENVIRONMENT "GIT_IMPLICIT_WORK_TREE"
447
448 /*
449 * Repository-local GIT_* environment variables; these will be cleared
450 * when git spawns a sub-process that runs inside another repository.
451 * The array is NULL-terminated, which makes it easy to pass in the "env"
452 * parameter of a run-command invocation, or to do a simple walk.
453 */
454 extern const char * const local_repo_env[];
455
456 extern int is_bare_repository_cfg;
457 extern int is_bare_repository(void);
458 extern int is_inside_git_dir(void);
459 extern char *git_work_tree_cfg;
460 extern int is_inside_work_tree(void);
461 extern const char *get_git_dir(void);
462 extern const char *get_git_common_dir(void);
463 extern char *get_object_directory(void);
464 extern char *get_index_file(void);
465 extern char *get_graft_file(void);
466 extern int set_git_dir(const char *path);
467 extern int get_common_dir_noenv(struct strbuf *sb, const char *gitdir);
468 extern int get_common_dir(struct strbuf *sb, const char *gitdir);
469 extern const char *get_git_namespace(void);
470 extern const char *strip_namespace(const char *namespaced_ref);
471 extern const char *get_git_work_tree(void);
472
473 /*
474 * Return true if the given path is a git directory; note that this _just_
475 * looks at the directory itself. If you want to know whether "foo/.git"
476 * is a repository, you must feed that path, not just "foo".
477 */
478 extern int is_git_directory(const char *path);
479
480 /*
481 * Return 1 if the given path is the root of a git repository or
482 * submodule, else 0. Will not return 1 for bare repositories with the
483 * exception of creating a bare repository in "foo/.git" and calling
484 * is_git_repository("foo").
485 *
486 * If we run into read errors, we err on the side of saying "yes, it is",
487 * as we usually consider sub-repos precious, and would prefer to err on the
488 * side of not disrupting or deleting them.
489 */
490 extern int is_nonbare_repository_dir(struct strbuf *path);
491
492 #define READ_GITFILE_ERR_STAT_FAILED 1
493 #define READ_GITFILE_ERR_NOT_A_FILE 2
494 #define READ_GITFILE_ERR_OPEN_FAILED 3
495 #define READ_GITFILE_ERR_READ_FAILED 4
496 #define READ_GITFILE_ERR_INVALID_FORMAT 5
497 #define READ_GITFILE_ERR_NO_PATH 6
498 #define READ_GITFILE_ERR_NOT_A_REPO 7
499 #define READ_GITFILE_ERR_TOO_LARGE 8
500 extern const char *read_gitfile_gently(const char *path, int *return_error_code);
501 #define read_gitfile(path) read_gitfile_gently((path), NULL)
502 extern const char *resolve_gitdir(const char *suspect);
503 extern void set_git_work_tree(const char *tree);
504
505 #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
506
507 extern const char **get_pathspec(const char *prefix, const char **pathspec);
508 extern void setup_work_tree(void);
509 extern const char *setup_git_directory_gently(int *);
510 extern const char *setup_git_directory(void);
511 extern char *prefix_path(const char *prefix, int len, const char *path);
512 extern char *prefix_path_gently(const char *prefix, int len, int *remaining, const char *path);
513 extern const char *prefix_filename(const char *prefix, int len, const char *path);
514 extern int check_filename(const char *prefix, const char *name);
515 extern void verify_filename(const char *prefix,
516 const char *name,
517 int diagnose_misspelt_rev);
518 extern void verify_non_filename(const char *prefix, const char *name);
519 extern int path_inside_repo(const char *prefix, const char *path);
520
521 #define INIT_DB_QUIET 0x0001
522
523 extern int set_git_dir_init(const char *git_dir, const char *real_git_dir, int);
524 extern int init_db(const char *template_dir, unsigned int flags);
525
526 extern void sanitize_stdfds(void);
527 extern int daemonize(void);
528
529 #define alloc_nr(x) (((x)+16)*3/2)
530
531 /*
532 * Realloc the buffer pointed at by variable 'x' so that it can hold
533 * at least 'nr' entries; the number of entries currently allocated
534 * is 'alloc', using the standard growing factor alloc_nr() macro.
535 *
536 * DO NOT USE any expression with side-effect for 'x', 'nr', or 'alloc'.
537 */
538 #define ALLOC_GROW(x, nr, alloc) \
539 do { \
540 if ((nr) > alloc) { \
541 if (alloc_nr(alloc) < (nr)) \
542 alloc = (nr); \
543 else \
544 alloc = alloc_nr(alloc); \
545 REALLOC_ARRAY(x, alloc); \
546 } \
547 } while (0)
548
549 /* Initialize and use the cache information */
550 struct lock_file;
551 extern int read_index(struct index_state *);
552 extern int read_index_preload(struct index_state *, const struct pathspec *pathspec);
553 extern int do_read_index(struct index_state *istate, const char *path,
554 int must_exist); /* for testting only! */
555 extern int read_index_from(struct index_state *, const char *path);
556 extern int is_index_unborn(struct index_state *);
557 extern int read_index_unmerged(struct index_state *);
558 #define COMMIT_LOCK (1 << 0)
559 #define CLOSE_LOCK (1 << 1)
560 extern int write_locked_index(struct index_state *, struct lock_file *lock, unsigned flags);
561 extern int discard_index(struct index_state *);
562 extern int unmerged_index(const struct index_state *);
563 extern int verify_path(const char *path);
564 extern int index_dir_exists(struct index_state *istate, const char *name, int namelen);
565 extern void adjust_dirname_case(struct index_state *istate, char *name);
566 extern struct cache_entry *index_file_exists(struct index_state *istate, const char *name, int namelen, int igncase);
567 extern int index_name_pos(const struct index_state *, const char *name, int namelen);
568 #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
569 #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
570 #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
571 #define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
572 #define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
573 #define ADD_CACHE_KEEP_CACHE_TREE 32 /* Do not invalidate cache-tree */
574 extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
575 extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
576 extern int remove_index_entry_at(struct index_state *, int pos);
577 extern void remove_marked_cache_entries(struct index_state *istate);
578 extern int remove_file_from_index(struct index_state *, const char *path);
579 #define ADD_CACHE_VERBOSE 1
580 #define ADD_CACHE_PRETEND 2
581 #define ADD_CACHE_IGNORE_ERRORS 4
582 #define ADD_CACHE_IGNORE_REMOVAL 8
583 #define ADD_CACHE_INTENT 16
584 extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
585 extern int add_file_to_index(struct index_state *, const char *path, int flags);
586 extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, unsigned int refresh_options);
587 extern int ce_same_name(const struct cache_entry *a, const struct cache_entry *b);
588 extern void set_object_name_for_intent_to_add_entry(struct cache_entry *ce);
589 extern int index_name_is_other(const struct index_state *, const char *, int);
590 extern void *read_blob_data_from_index(struct index_state *, const char *, unsigned long *);
591
592 /* do stat comparison even if CE_VALID is true */
593 #define CE_MATCH_IGNORE_VALID 01
594 /* do not check the contents but report dirty on racily-clean entries */
595 #define CE_MATCH_RACY_IS_DIRTY 02
596 /* do stat comparison even if CE_SKIP_WORKTREE is true */
597 #define CE_MATCH_IGNORE_SKIP_WORKTREE 04
598 /* ignore non-existent files during stat update */
599 #define CE_MATCH_IGNORE_MISSING 0x08
600 /* enable stat refresh */
601 #define CE_MATCH_REFRESH 0x10
602 extern int ie_match_stat(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
603 extern int ie_modified(const struct index_state *, const struct cache_entry *, struct stat *, unsigned int);
604
605 #define HASH_WRITE_OBJECT 1
606 #define HASH_FORMAT_CHECK 2
607 extern int index_fd(unsigned char *sha1, int fd, struct stat *st, enum object_type type, const char *path, unsigned flags);
608 extern int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags);
609
610 /*
611 * Record to sd the data from st that we use to check whether a file
612 * might have changed.
613 */
614 extern void fill_stat_data(struct stat_data *sd, struct stat *st);
615
616 /*
617 * Return 0 if st is consistent with a file not having been changed
618 * since sd was filled. If there are differences, return a
619 * combination of MTIME_CHANGED, CTIME_CHANGED, OWNER_CHANGED,
620 * INODE_CHANGED, and DATA_CHANGED.
621 */
622 extern int match_stat_data(const struct stat_data *sd, struct stat *st);
623 extern int match_stat_data_racy(const struct index_state *istate,
624 const struct stat_data *sd, struct stat *st);
625
626 extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
627
628 #define REFRESH_REALLY 0x0001 /* ignore_valid */
629 #define REFRESH_UNMERGED 0x0002 /* allow unmerged */
630 #define REFRESH_QUIET 0x0004 /* be quiet about it */
631 #define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
632 #define REFRESH_IGNORE_SUBMODULES 0x0010 /* ignore submodules */
633 #define REFRESH_IN_PORCELAIN 0x0020 /* user friendly output, not "needs update" */
634 extern int refresh_index(struct index_state *, unsigned int flags, const struct pathspec *pathspec, char *seen, const char *header_msg);
635
636 extern void update_index_if_able(struct index_state *, struct lock_file *);
637
638 extern int hold_locked_index(struct lock_file *, int);
639 extern void set_alternate_index_output(const char *);
640
641 /* Environment bits from configuration mechanism */
642 extern int trust_executable_bit;
643 extern int trust_ctime;
644 extern int check_stat;
645 extern int quote_path_fully;
646 extern int has_symlinks;
647 extern int minimum_abbrev, default_abbrev;
648 extern int ignore_case;
649 extern int assume_unchanged;
650 extern int prefer_symlink_refs;
651 extern int log_all_ref_updates;
652 extern int warn_ambiguous_refs;
653 extern int warn_on_object_refname_ambiguity;
654 extern const char *apply_default_whitespace;
655 extern const char *apply_default_ignorewhitespace;
656 extern const char *git_attributes_file;
657 extern int zlib_compression_level;
658 extern int core_compression_level;
659 extern int core_compression_seen;
660 extern size_t packed_git_window_size;
661 extern size_t packed_git_limit;
662 extern size_t delta_base_cache_limit;
663 extern unsigned long big_file_threshold;
664 extern unsigned long pack_size_limit_cfg;
665
666 void set_shared_repository(int value);
667 int get_shared_repository(void);
668
669 /*
670 * Do replace refs need to be checked this run? This variable is
671 * initialized to true unless --no-replace-object is used or
672 * $GIT_NO_REPLACE_OBJECTS is set, but is set to false by some
673 * commands that do not want replace references to be active. As an
674 * optimization it is also set to false if replace references have
675 * been sought but there were none.
676 */
677 extern int check_replace_refs;
678 extern char *git_replace_ref_base;
679
680 extern int fsync_object_files;
681 extern int core_preload_index;
682 extern int core_apply_sparse_checkout;
683 extern int precomposed_unicode;
684 extern int protect_hfs;
685 extern int protect_ntfs;
686 extern int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
687
688 /*
689 * Include broken refs in all ref iterations, which will
690 * generally choke dangerous operations rather than letting
691 * them silently proceed without taking the broken ref into
692 * account.
693 */
694 extern int ref_paranoia;
695
696 /*
697 * The character that begins a commented line in user-editable file
698 * that is subject to stripspace.
699 */
700 extern char comment_line_char;
701 extern int auto_comment_line_char;
702
703 /* Windows only */
704 enum hide_dotfiles_type {
705 HIDE_DOTFILES_FALSE = 0,
706 HIDE_DOTFILES_TRUE,
707 HIDE_DOTFILES_DOTGITONLY
708 };
709 extern enum hide_dotfiles_type hide_dotfiles;
710
711 enum branch_track {
712 BRANCH_TRACK_UNSPECIFIED = -1,
713 BRANCH_TRACK_NEVER = 0,
714 BRANCH_TRACK_REMOTE,
715 BRANCH_TRACK_ALWAYS,
716 BRANCH_TRACK_EXPLICIT,
717 BRANCH_TRACK_OVERRIDE
718 };
719
720 enum rebase_setup_type {
721 AUTOREBASE_NEVER = 0,
722 AUTOREBASE_LOCAL,
723 AUTOREBASE_REMOTE,
724 AUTOREBASE_ALWAYS
725 };
726
727 enum push_default_type {
728 PUSH_DEFAULT_NOTHING = 0,
729 PUSH_DEFAULT_MATCHING,
730 PUSH_DEFAULT_SIMPLE,
731 PUSH_DEFAULT_UPSTREAM,
732 PUSH_DEFAULT_CURRENT,
733 PUSH_DEFAULT_UNSPECIFIED
734 };
735
736 extern enum branch_track git_branch_track;
737 extern enum rebase_setup_type autorebase;
738 extern enum push_default_type push_default;
739
740 enum object_creation_mode {
741 OBJECT_CREATION_USES_HARDLINKS = 0,
742 OBJECT_CREATION_USES_RENAMES = 1
743 };
744
745 extern enum object_creation_mode object_creation_mode;
746
747 extern char *notes_ref_name;
748
749 extern int grafts_replace_parents;
750
751 /*
752 * GIT_REPO_VERSION is the version we write by default. The
753 * _READ variant is the highest number we know how to
754 * handle.
755 */
756 #define GIT_REPO_VERSION 0
757 #define GIT_REPO_VERSION_READ 1
758 extern int repository_format_precious_objects;
759
760 struct repository_format {
761 int version;
762 int precious_objects;
763 int is_bare;
764 char *work_tree;
765 struct string_list unknown_extensions;
766 };
767
768 /*
769 * Read the repository format characteristics from the config file "path" into
770 * "format" struct. Returns the numeric version. On error, -1 is returned,
771 * format->version is set to -1, and all other fields in the struct are
772 * undefined.
773 */
774 int read_repository_format(struct repository_format *format, const char *path);
775
776 /*
777 * Verify that the repository described by repository_format is something we
778 * can read. If it is, return 0. Otherwise, return -1, and "err" will describe
779 * any errors encountered.
780 */
781 int verify_repository_format(const struct repository_format *format,
782 struct strbuf *err);
783
784 /*
785 * Check the repository format version in the path found in get_git_dir(),
786 * and die if it is a version we don't understand. Generally one would
787 * set_git_dir() before calling this, and use it only for "are we in a valid
788 * repo?".
789 */
790 extern void check_repository_format(void);
791
792 #define MTIME_CHANGED 0x0001
793 #define CTIME_CHANGED 0x0002
794 #define OWNER_CHANGED 0x0004
795 #define MODE_CHANGED 0x0008
796 #define INODE_CHANGED 0x0010
797 #define DATA_CHANGED 0x0020
798 #define TYPE_CHANGED 0x0040
799
800 /*
801 * Return a statically allocated filename, either generically (mkpath), in
802 * the repository directory (git_path), or in a submodule's repository
803 * directory (git_path_submodule). In all cases, note that the result
804 * may be overwritten by another call to _any_ of the functions. Consider
805 * using the safer "dup" or "strbuf" formats below (in some cases, the
806 * unsafe versions have already been removed).
807 */
808 extern const char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
809 extern const char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
810
811 extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
812 __attribute__((format (printf, 3, 4)));
813 extern void strbuf_git_path(struct strbuf *sb, const char *fmt, ...)
814 __attribute__((format (printf, 2, 3)));
815 extern char *git_path_buf(struct strbuf *buf, const char *fmt, ...)
816 __attribute__((format (printf, 2, 3)));
817 extern void strbuf_git_path_submodule(struct strbuf *sb, const char *path,
818 const char *fmt, ...)
819 __attribute__((format (printf, 3, 4)));
820 extern char *git_pathdup(const char *fmt, ...)
821 __attribute__((format (printf, 1, 2)));
822 extern char *mkpathdup(const char *fmt, ...)
823 __attribute__((format (printf, 1, 2)));
824 extern char *git_pathdup_submodule(const char *path, const char *fmt, ...)
825 __attribute__((format (printf, 2, 3)));
826
827 extern void report_linked_checkout_garbage(void);
828
829 /*
830 * You can define a static memoized git path like:
831 *
832 * static GIT_PATH_FUNC(git_path_foo, "FOO");
833 *
834 * or use one of the global ones below.
835 */
836 #define GIT_PATH_FUNC(func, filename) \
837 const char *func(void) \
838 { \
839 static char *ret; \
840 if (!ret) \
841 ret = git_pathdup(filename); \
842 return ret; \
843 }
844
845 const char *git_path_cherry_pick_head(void);
846 const char *git_path_revert_head(void);
847 const char *git_path_squash_msg(void);
848 const char *git_path_merge_msg(void);
849 const char *git_path_merge_rr(void);
850 const char *git_path_merge_mode(void);
851 const char *git_path_merge_head(void);
852 const char *git_path_fetch_head(void);
853 const char *git_path_shallow(void);
854
855 /*
856 * Return the name of the file in the local object database that would
857 * be used to store a loose object with the specified sha1. The
858 * return value is a pointer to a statically allocated buffer that is
859 * overwritten each time the function is called.
860 */
861 extern const char *sha1_file_name(const unsigned char *sha1);
862
863 /*
864 * Return the name of the (local) packfile with the specified sha1 in
865 * its name. The return value is a pointer to memory that is
866 * overwritten each time this function is called.
867 */
868 extern char *sha1_pack_name(const unsigned char *sha1);
869
870 /*
871 * Return the name of the (local) pack index file with the specified
872 * sha1 in its name. The return value is a pointer to memory that is
873 * overwritten each time this function is called.
874 */
875 extern char *sha1_pack_index_name(const unsigned char *sha1);
876
877 /*
878 * Return an abbreviated sha1 unique within this repository's object database.
879 * The result will be at least `len` characters long, and will be NUL
880 * terminated.
881 *
882 * The non-`_r` version returns a static buffer which will be overwritten by
883 * subsequent calls.
884 *
885 * The `_r` variant writes to a buffer supplied by the caller, which must be at
886 * least `GIT_SHA1_HEXSZ + 1` bytes. The return value is the number of bytes
887 * written (excluding the NUL terminator).
888 *
889 * Note that while this version avoids the static buffer, it is not fully
890 * reentrant, as it calls into other non-reentrant git code.
891 */
892 extern const char *find_unique_abbrev(const unsigned char *sha1, int len);
893 extern int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len);
894
895 extern const unsigned char null_sha1[GIT_SHA1_RAWSZ];
896 extern const struct object_id null_oid;
897
898 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
899 {
900 int i;
901
902 for (i = 0; i < GIT_SHA1_RAWSZ; i++, sha1++, sha2++) {
903 if (*sha1 != *sha2)
904 return *sha1 - *sha2;
905 }
906
907 return 0;
908 }
909
910 static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2)
911 {
912 return hashcmp(oid1->hash, oid2->hash);
913 }
914
915 static inline int is_null_sha1(const unsigned char *sha1)
916 {
917 return !hashcmp(sha1, null_sha1);
918 }
919
920 static inline int is_null_oid(const struct object_id *oid)
921 {
922 return !hashcmp(oid->hash, null_sha1);
923 }
924
925 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
926 {
927 memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ);
928 }
929
930 static inline void oidcpy(struct object_id *dst, const struct object_id *src)
931 {
932 hashcpy(dst->hash, src->hash);
933 }
934
935 static inline void hashclr(unsigned char *hash)
936 {
937 memset(hash, 0, GIT_SHA1_RAWSZ);
938 }
939
940 static inline void oidclr(struct object_id *oid)
941 {
942 hashclr(oid->hash);
943 }
944
945
946 #define EMPTY_TREE_SHA1_HEX \
947 "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
948 #define EMPTY_TREE_SHA1_BIN_LITERAL \
949 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
950 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
951 #define EMPTY_TREE_SHA1_BIN \
952 ((const unsigned char *) EMPTY_TREE_SHA1_BIN_LITERAL)
953
954 #define EMPTY_BLOB_SHA1_HEX \
955 "e69de29bb2d1d6434b8b29ae775ad8c2e48c5391"
956 #define EMPTY_BLOB_SHA1_BIN_LITERAL \
957 "\xe6\x9d\xe2\x9b\xb2\xd1\xd6\x43\x4b\x8b" \
958 "\x29\xae\x77\x5a\xd8\xc2\xe4\x8c\x53\x91"
959 #define EMPTY_BLOB_SHA1_BIN \
960 ((const unsigned char *) EMPTY_BLOB_SHA1_BIN_LITERAL)
961
962 static inline int is_empty_blob_sha1(const unsigned char *sha1)
963 {
964 return !hashcmp(sha1, EMPTY_BLOB_SHA1_BIN);
965 }
966
967 int git_mkstemp(char *path, size_t n, const char *template);
968
969 /* set default permissions by passing mode arguments to open(2) */
970 int git_mkstemps_mode(char *pattern, int suffix_len, int mode);
971 int git_mkstemp_mode(char *pattern, int mode);
972
973 /*
974 * NOTE NOTE NOTE!!
975 *
976 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
977 * not be changed. Old repositories have core.sharedrepository written in
978 * numeric format, and therefore these values are preserved for compatibility
979 * reasons.
980 */
981 enum sharedrepo {
982 PERM_UMASK = 0,
983 OLD_PERM_GROUP = 1,
984 OLD_PERM_EVERYBODY = 2,
985 PERM_GROUP = 0660,
986 PERM_EVERYBODY = 0664
987 };
988 int git_config_perm(const char *var, const char *value);
989 int adjust_shared_perm(const char *path);
990
991 /*
992 * Create the directory containing the named path, using care to be
993 * somewhat safe against races. Return one of the scld_error values
994 * to indicate success/failure.
995 *
996 * SCLD_VANISHED indicates that one of the ancestor directories of the
997 * path existed at one point during the function call and then
998 * suddenly vanished, probably because another process pruned the
999 * directory while we were working. To be robust against this kind of
1000 * race, callers might want to try invoking the function again when it
1001 * returns SCLD_VANISHED.
1002 */
1003 enum scld_error {
1004 SCLD_OK = 0,
1005 SCLD_FAILED = -1,
1006 SCLD_PERMS = -2,
1007 SCLD_EXISTS = -3,
1008 SCLD_VANISHED = -4
1009 };
1010 enum scld_error safe_create_leading_directories(char *path);
1011 enum scld_error safe_create_leading_directories_const(const char *path);
1012
1013 int mkdir_in_gitdir(const char *path);
1014 extern char *expand_user_path(const char *path);
1015 const char *enter_repo(const char *path, int strict);
1016 static inline int is_absolute_path(const char *path)
1017 {
1018 return is_dir_sep(path[0]) || has_dos_drive_prefix(path);
1019 }
1020 int is_directory(const char *);
1021 const char *real_path(const char *path);
1022 const char *real_path_if_valid(const char *path);
1023 const char *absolute_path(const char *path);
1024 const char *remove_leading_path(const char *in, const char *prefix);
1025 const char *relative_path(const char *in, const char *prefix, struct strbuf *sb);
1026 int normalize_path_copy_len(char *dst, const char *src, int *prefix_len);
1027 int normalize_path_copy(char *dst, const char *src);
1028 int longest_ancestor_length(const char *path, struct string_list *prefixes);
1029 char *strip_path_suffix(const char *path, const char *suffix);
1030 int daemon_avoid_alias(const char *path);
1031 extern int is_ntfs_dotgit(const char *name);
1032
1033 /*
1034 * Returns true iff "str" could be confused as a command-line option when
1035 * passed to a sub-program like "ssh". Note that this has nothing to do with
1036 * shell-quoting, which should be handled separately; we're assuming here that
1037 * the string makes it verbatim to the sub-program.
1038 */
1039 int looks_like_command_line_option(const char *str);
1040
1041 /**
1042 * Return a newly allocated string with the evaluation of
1043 * "$XDG_CONFIG_HOME/git/$filename" if $XDG_CONFIG_HOME is non-empty, otherwise
1044 * "$HOME/.config/git/$filename". Return NULL upon error.
1045 */
1046 extern char *xdg_config_home(const char *filename);
1047
1048 /* object replacement */
1049 #define LOOKUP_REPLACE_OBJECT 1
1050 #define LOOKUP_UNKNOWN_OBJECT 2
1051 extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag);
1052 static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size)
1053 {
1054 return read_sha1_file_extended(sha1, type, size, LOOKUP_REPLACE_OBJECT);
1055 }
1056
1057 /*
1058 * This internal function is only declared here for the benefit of
1059 * lookup_replace_object(). Please do not call it directly.
1060 */
1061 extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1);
1062
1063 /*
1064 * If object sha1 should be replaced, return the replacement object's
1065 * name (replaced recursively, if necessary). The return value is
1066 * either sha1 or a pointer to a permanently-allocated value. When
1067 * object replacement is suppressed, always return sha1.
1068 */
1069 static inline const unsigned char *lookup_replace_object(const unsigned char *sha1)
1070 {
1071 if (!check_replace_refs)
1072 return sha1;
1073 return do_lookup_replace_object(sha1);
1074 }
1075
1076 static inline const unsigned char *lookup_replace_object_extended(const unsigned char *sha1, unsigned flag)
1077 {
1078 if (!(flag & LOOKUP_REPLACE_OBJECT))
1079 return sha1;
1080 return lookup_replace_object(sha1);
1081 }
1082
1083 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
1084 extern int sha1_object_info(const unsigned char *, unsigned long *);
1085 extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
1086 extern int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
1087 extern int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type, unsigned char *sha1, unsigned flags);
1088 extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
1089 extern int force_object_loose(const unsigned char *sha1, time_t mtime);
1090 extern int git_open_noatime(const char *name);
1091 extern void *map_sha1_file(const unsigned char *sha1, unsigned long *size);
1092 extern int unpack_sha1_header(git_zstream *stream, unsigned char *map, unsigned long mapsize, void *buffer, unsigned long bufsiz);
1093 extern int parse_sha1_header(const char *hdr, unsigned long *sizep);
1094
1095 /* global flag to enable extra checks when accessing packed objects */
1096 extern int do_check_packed_object_crc;
1097
1098 extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
1099
1100 extern int finalize_object_file(const char *tmpfile, const char *filename);
1101
1102 extern int has_sha1_pack(const unsigned char *sha1);
1103
1104 /*
1105 * Return true iff we have an object named sha1, whether local or in
1106 * an alternate object database, and whether packed or loose. This
1107 * function does not respect replace references.
1108 *
1109 * If the QUICK flag is set, do not re-check the pack directory
1110 * when we cannot find the object (this means we may give a false
1111 * negative answer if another process is simultaneously repacking).
1112 */
1113 #define HAS_SHA1_QUICK 0x1
1114 extern int has_sha1_file_with_flags(const unsigned char *sha1, int flags);
1115 static inline int has_sha1_file(const unsigned char *sha1)
1116 {
1117 return has_sha1_file_with_flags(sha1, 0);
1118 }
1119
1120 /* Same as the above, except for struct object_id. */
1121 extern int has_object_file(const struct object_id *oid);
1122
1123 /*
1124 * Return true iff an alternate object database has a loose object
1125 * with the specified name. This function does not respect replace
1126 * references.
1127 */
1128 extern int has_loose_object_nonlocal(const unsigned char *sha1);
1129
1130 extern int has_pack_index(const unsigned char *sha1);
1131
1132 extern void assert_sha1_type(const unsigned char *sha1, enum object_type expect);
1133
1134 extern const signed char hexval_table[256];
1135 static inline unsigned int hexval(unsigned char c)
1136 {
1137 return hexval_table[c];
1138 }
1139
1140 /* Convert to/from hex/sha1 representation */
1141 #define MINIMUM_ABBREV minimum_abbrev
1142 #define DEFAULT_ABBREV default_abbrev
1143
1144 struct object_context {
1145 unsigned char tree[20];
1146 char path[PATH_MAX];
1147 unsigned mode;
1148 /*
1149 * symlink_path is only used by get_tree_entry_follow_symlinks,
1150 * and only for symlinks that point outside the repository.
1151 */
1152 struct strbuf symlink_path;
1153 };
1154
1155 #define GET_SHA1_QUIETLY 01
1156 #define GET_SHA1_COMMIT 02
1157 #define GET_SHA1_COMMITTISH 04
1158 #define GET_SHA1_TREE 010
1159 #define GET_SHA1_TREEISH 020
1160 #define GET_SHA1_BLOB 040
1161 #define GET_SHA1_FOLLOW_SYMLINKS 0100
1162 #define GET_SHA1_ONLY_TO_DIE 04000
1163
1164 extern int get_sha1(const char *str, unsigned char *sha1);
1165 extern int get_sha1_commit(const char *str, unsigned char *sha1);
1166 extern int get_sha1_committish(const char *str, unsigned char *sha1);
1167 extern int get_sha1_tree(const char *str, unsigned char *sha1);
1168 extern int get_sha1_treeish(const char *str, unsigned char *sha1);
1169 extern int get_sha1_blob(const char *str, unsigned char *sha1);
1170 extern void maybe_die_on_misspelt_object_name(const char *name, const char *prefix);
1171 extern int get_sha1_with_context(const char *str, unsigned flags, unsigned char *sha1, struct object_context *orc);
1172
1173 typedef int each_abbrev_fn(const unsigned char *sha1, void *);
1174 extern int for_each_abbrev(const char *prefix, each_abbrev_fn, void *);
1175
1176 /*
1177 * Try to read a SHA1 in hexadecimal format from the 40 characters
1178 * starting at hex. Write the 20-byte result to sha1 in binary form.
1179 * Return 0 on success. Reading stops if a NUL is encountered in the
1180 * input, so it is safe to pass this function an arbitrary
1181 * null-terminated string.
1182 */
1183 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
1184 extern int get_oid_hex(const char *hex, struct object_id *sha1);
1185
1186 /*
1187 * Convert a binary sha1 to its hex equivalent. The `_r` variant is reentrant,
1188 * and writes the NUL-terminated output to the buffer `out`, which must be at
1189 * least `GIT_SHA1_HEXSZ + 1` bytes, and returns a pointer to out for
1190 * convenience.
1191 *
1192 * The non-`_r` variant returns a static buffer, but uses a ring of 4
1193 * buffers, making it safe to make multiple calls for a single statement, like:
1194 *
1195 * printf("%s -> %s", sha1_to_hex(one), sha1_to_hex(two));
1196 */
1197 extern char *sha1_to_hex_r(char *out, const unsigned char *sha1);
1198 extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
1199 extern char *oid_to_hex(const struct object_id *oid); /* same static buffer as sha1_to_hex */
1200
1201 extern int interpret_branch_name(const char *str, int len, struct strbuf *);
1202 extern int get_sha1_mb(const char *str, unsigned char *sha1);
1203
1204 extern int validate_headref(const char *ref);
1205
1206 extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
1207 extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
1208 extern int name_compare(const char *name1, size_t len1, const char *name2, size_t len2);
1209 extern int cache_name_stage_compare(const char *name1, int len1, int stage1, const char *name2, int len2, int stage2);
1210
1211 extern void *read_object_with_reference(const unsigned char *sha1,
1212 const char *required_type,
1213 unsigned long *size,
1214 unsigned char *sha1_ret);
1215
1216 extern struct object *peel_to_type(const char *name, int namelen,
1217 struct object *o, enum object_type);
1218
1219 struct date_mode {
1220 enum date_mode_type {
1221 DATE_NORMAL = 0,
1222 DATE_RELATIVE,
1223 DATE_SHORT,
1224 DATE_ISO8601,
1225 DATE_ISO8601_STRICT,
1226 DATE_RFC2822,
1227 DATE_STRFTIME,
1228 DATE_RAW
1229 } type;
1230 const char *strftime_fmt;
1231 int local;
1232 };
1233
1234 /*
1235 * Convenience helper for passing a constant type, like:
1236 *
1237 * show_date(t, tz, DATE_MODE(NORMAL));
1238 */
1239 #define DATE_MODE(t) date_mode_from_type(DATE_##t)
1240 struct date_mode *date_mode_from_type(enum date_mode_type type);
1241
1242 const char *show_date(unsigned long time, int timezone, const struct date_mode *mode);
1243 void show_date_relative(unsigned long time, int tz, const struct timeval *now,
1244 struct strbuf *timebuf);
1245 int parse_date(const char *date, struct strbuf *out);
1246 int parse_date_basic(const char *date, unsigned long *timestamp, int *offset);
1247 int parse_expiry_date(const char *date, unsigned long *timestamp);
1248 void datestamp(struct strbuf *out);
1249 #define approxidate(s) approxidate_careful((s), NULL)
1250 unsigned long approxidate_careful(const char *, int *);
1251 unsigned long approxidate_relative(const char *date, const struct timeval *now);
1252 void parse_date_format(const char *format, struct date_mode *mode);
1253 int date_overflows(unsigned long date);
1254
1255 #define IDENT_STRICT 1
1256 #define IDENT_NO_DATE 2
1257 #define IDENT_NO_NAME 4
1258 extern const char *git_author_info(int);
1259 extern const char *git_committer_info(int);
1260 extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
1261 extern const char *fmt_name(const char *name, const char *email);
1262 extern const char *ident_default_name(void);
1263 extern const char *ident_default_email(void);
1264 extern const char *git_editor(void);
1265 extern const char *git_pager(int stdout_is_tty);
1266 extern int git_ident_config(const char *, const char *, void *);
1267
1268 struct ident_split {
1269 const char *name_begin;
1270 const char *name_end;
1271 const char *mail_begin;
1272 const char *mail_end;
1273 const char *date_begin;
1274 const char *date_end;
1275 const char *tz_begin;
1276 const char *tz_end;
1277 };
1278 /*
1279 * Signals an success with 0, but time part of the result may be NULL
1280 * if the input lacks timestamp and zone
1281 */
1282 extern int split_ident_line(struct ident_split *, const char *, int);
1283
1284 /*
1285 * Like show_date, but pull the timestamp and tz parameters from
1286 * the ident_split. It will also sanity-check the values and produce
1287 * a well-known sentinel date if they appear bogus.
1288 */
1289 const char *show_ident_date(const struct ident_split *id,
1290 const struct date_mode *mode);
1291
1292 /*
1293 * Compare split idents for equality or strict ordering. Note that we
1294 * compare only the ident part of the line, ignoring any timestamp.
1295 *
1296 * Because there are two fields, we must choose one as the primary key; we
1297 * currently arbitrarily pick the email.
1298 */
1299 extern int ident_cmp(const struct ident_split *, const struct ident_split *);
1300
1301 struct checkout {
1302 struct index_state *istate;
1303 const char *base_dir;
1304 int base_dir_len;
1305 unsigned force:1,
1306 quiet:1,
1307 not_new:1,
1308 refresh_cache:1;
1309 };
1310
1311 #define TEMPORARY_FILENAME_LENGTH 25
1312 extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
1313
1314 struct cache_def {
1315 struct strbuf path;
1316 int flags;
1317 int track_flags;
1318 int prefix_len_stat_func;
1319 };
1320 #define CACHE_DEF_INIT { STRBUF_INIT, 0, 0, 0 }
1321 static inline void cache_def_clear(struct cache_def *cache)
1322 {
1323 strbuf_release(&cache->path);
1324 }
1325
1326 extern int has_symlink_leading_path(const char *name, int len);
1327 extern int threaded_has_symlink_leading_path(struct cache_def *, const char *, int);
1328 extern int check_leading_path(const char *name, int len);
1329 extern int has_dirs_only_path(const char *name, int len, int prefix_len);
1330 extern void schedule_dir_for_removal(const char *name, int len);
1331 extern void remove_scheduled_dirs(void);
1332
1333 extern struct alternate_object_database {
1334 struct alternate_object_database *next;
1335 char *name;
1336 char base[FLEX_ARRAY]; /* more */
1337 } *alt_odb_list;
1338 extern void prepare_alt_odb(void);
1339 extern void read_info_alternates(const char * relative_base, int depth);
1340 extern void add_to_alternates_file(const char *reference);
1341 typedef int alt_odb_fn(struct alternate_object_database *, void *);
1342 extern int foreach_alt_odb(alt_odb_fn, void*);
1343
1344 struct pack_window {
1345 struct pack_window *next;
1346 unsigned char *base;
1347 off_t offset;
1348 size_t len;
1349 unsigned int last_used;
1350 unsigned int inuse_cnt;
1351 };
1352
1353 extern struct packed_git {
1354 struct packed_git *next;
1355 struct pack_window *windows;
1356 off_t pack_size;
1357 const void *index_data;
1358 size_t index_size;
1359 uint32_t num_objects;
1360 uint32_t num_bad_objects;
1361 unsigned char *bad_object_sha1;
1362 int index_version;
1363 time_t mtime;
1364 int pack_fd;
1365 unsigned pack_local:1,
1366 pack_keep:1,
1367 freshened:1,
1368 do_not_close:1;
1369 unsigned char sha1[20];
1370 struct revindex_entry *revindex;
1371 /* something like ".git/objects/pack/xxxxx.pack" */
1372 char pack_name[FLEX_ARRAY]; /* more */
1373 } *packed_git;
1374
1375 struct pack_entry {
1376 off_t offset;
1377 unsigned char sha1[20];
1378 struct packed_git *p;
1379 };
1380
1381 extern struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path);
1382
1383 /* A hook to report invalid files in pack directory */
1384 #define PACKDIR_FILE_PACK 1
1385 #define PACKDIR_FILE_IDX 2
1386 #define PACKDIR_FILE_GARBAGE 4
1387 extern void (*report_garbage)(unsigned seen_bits, const char *path);
1388
1389 extern void prepare_packed_git(void);
1390 extern void reprepare_packed_git(void);
1391 extern void install_packed_git(struct packed_git *pack);
1392
1393 extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
1394 struct packed_git *packs);
1395
1396 extern void pack_report(void);
1397
1398 /*
1399 * mmap the index file for the specified packfile (if it is not
1400 * already mmapped). Return 0 on success.
1401 */
1402 extern int open_pack_index(struct packed_git *);
1403
1404 /*
1405 * munmap the index file for the specified packfile (if it is
1406 * currently mmapped).
1407 */
1408 extern void close_pack_index(struct packed_git *);
1409
1410 extern unsigned char *use_pack(struct packed_git *, struct pack_window **, off_t, unsigned long *);
1411 extern void close_pack_windows(struct packed_git *);
1412 extern void close_all_packs(void);
1413 extern void unuse_pack(struct pack_window **);
1414 extern void free_pack_by_name(const char *);
1415 extern void clear_delta_base_cache(void);
1416 extern struct packed_git *add_packed_git(const char *path, size_t path_len, int local);
1417
1418 /*
1419 * Make sure that a pointer access into an mmap'd index file is within bounds,
1420 * and can provide at least 8 bytes of data.
1421 *
1422 * Note that this is only necessary for variable-length segments of the file
1423 * (like the 64-bit extended offset table), as we compare the size to the
1424 * fixed-length parts when we open the file.
1425 */
1426 extern void check_pack_index_ptr(const struct packed_git *p, const void *ptr);
1427
1428 /*
1429 * Return the SHA-1 of the nth object within the specified packfile.
1430 * Open the index if it is not already open. The return value points
1431 * at the SHA-1 within the mmapped index. Return NULL if there is an
1432 * error.
1433 */
1434 extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t n);
1435
1436 /*
1437 * Return the offset of the nth object within the specified packfile.
1438 * The index must already be opened.
1439 */
1440 extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t n);
1441
1442 /*
1443 * If the object named sha1 is present in the specified packfile,
1444 * return its offset within the packfile; otherwise, return 0.
1445 */
1446 extern off_t find_pack_entry_one(const unsigned char *sha1, struct packed_git *);
1447
1448 extern int is_pack_valid(struct packed_git *);
1449 extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
1450 extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
1451 extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
1452 extern int unpack_object_header(struct packed_git *, struct pack_window **, off_t *, unsigned long *);
1453
1454 /*
1455 * Iterate over the files in the loose-object parts of the object
1456 * directory "path", triggering the following callbacks:
1457 *
1458 * - loose_object is called for each loose object we find.
1459 *
1460 * - loose_cruft is called for any files that do not appear to be
1461 * loose objects. Note that we only look in the loose object
1462 * directories "objects/[0-9a-f]{2}/", so we will not report
1463 * "objects/foobar" as cruft.
1464 *
1465 * - loose_subdir is called for each top-level hashed subdirectory
1466 * of the object directory (e.g., "$OBJDIR/f0"). It is called
1467 * after the objects in the directory are processed.
1468 *
1469 * Any callback that is NULL will be ignored. Callbacks returning non-zero
1470 * will end the iteration.
1471 *
1472 * In the "buf" variant, "path" is a strbuf which will also be used as a
1473 * scratch buffer, but restored to its original contents before
1474 * the function returns.
1475 */
1476 typedef int each_loose_object_fn(const unsigned char *sha1,
1477 const char *path,
1478 void *data);
1479 typedef int each_loose_cruft_fn(const char *basename,
1480 const char *path,
1481 void *data);
1482 typedef int each_loose_subdir_fn(int nr,
1483 const char *path,
1484 void *data);
1485 int for_each_loose_file_in_objdir(const char *path,
1486 each_loose_object_fn obj_cb,
1487 each_loose_cruft_fn cruft_cb,
1488 each_loose_subdir_fn subdir_cb,
1489 void *data);
1490 int for_each_loose_file_in_objdir_buf(struct strbuf *path,
1491 each_loose_object_fn obj_cb,
1492 each_loose_cruft_fn cruft_cb,
1493 each_loose_subdir_fn subdir_cb,
1494 void *data);
1495
1496 /*
1497 * Iterate over loose and packed objects in both the local
1498 * repository and any alternates repositories (unless the
1499 * LOCAL_ONLY flag is set).
1500 */
1501 #define FOR_EACH_OBJECT_LOCAL_ONLY 0x1
1502 typedef int each_packed_object_fn(const unsigned char *sha1,
1503 struct packed_git *pack,
1504 uint32_t pos,
1505 void *data);
1506 extern int for_each_loose_object(each_loose_object_fn, void *, unsigned flags);
1507 extern int for_each_packed_object(each_packed_object_fn, void *, unsigned flags);
1508
1509 struct object_info {
1510 /* Request */
1511 enum object_type *typep;
1512 unsigned long *sizep;
1513 unsigned long *disk_sizep;
1514 unsigned char *delta_base_sha1;
1515 struct strbuf *typename;
1516
1517 /* Response */
1518 enum {
1519 OI_CACHED,
1520 OI_LOOSE,
1521 OI_PACKED,
1522 OI_DBCACHED
1523 } whence;
1524 union {
1525 /*
1526 * struct {
1527 * ... Nothing to expose in this case
1528 * } cached;
1529 * struct {
1530 * ... Nothing to expose in this case
1531 * } loose;
1532 */
1533 struct {
1534 struct packed_git *pack;
1535 off_t offset;
1536 unsigned int is_delta;
1537 } packed;
1538 } u;
1539 };
1540 extern int sha1_object_info_extended(const unsigned char *, struct object_info *, unsigned flags);
1541
1542 /* Dumb servers support */
1543 extern int update_server_info(int);
1544
1545 /* git_config_parse_key() returns these negated: */
1546 #define CONFIG_INVALID_KEY 1
1547 #define CONFIG_NO_SECTION_OR_NAME 2
1548 /* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */
1549 #define CONFIG_NO_LOCK -1
1550 #define CONFIG_INVALID_FILE 3
1551 #define CONFIG_NO_WRITE 4
1552 #define CONFIG_NOTHING_SET 5
1553 #define CONFIG_INVALID_PATTERN 6
1554 #define CONFIG_GENERIC_ERROR 7
1555
1556 #define CONFIG_REGEX_NONE ((void *)1)
1557
1558 struct git_config_source {
1559 unsigned int use_stdin:1;
1560 const char *file;
1561 const char *blob;
1562 };
1563
1564 typedef int (*config_fn_t)(const char *, const char *, void *);
1565 extern int git_default_config(const char *, const char *, void *);
1566 extern int git_config_from_file(config_fn_t fn, const char *, void *);
1567 extern int git_config_from_mem(config_fn_t fn, const char *origin_type,
1568 const char *name, const char *buf, size_t len, void *data);
1569 extern void git_config_push_parameter(const char *text);
1570 extern int git_config_from_parameters(config_fn_t fn, void *data);
1571 extern void git_config(config_fn_t fn, void *);
1572 extern int git_config_with_options(config_fn_t fn, void *,
1573 struct git_config_source *config_source,
1574 int respect_includes);
1575 extern int git_parse_ulong(const char *, unsigned long *);
1576 extern int git_parse_maybe_bool(const char *);
1577 extern int git_config_int(const char *, const char *);
1578 extern int64_t git_config_int64(const char *, const char *);
1579 extern unsigned long git_config_ulong(const char *, const char *);
1580 extern int git_config_bool_or_int(const char *, const char *, int *);
1581 extern int git_config_bool(const char *, const char *);
1582 extern int git_config_maybe_bool(const char *, const char *);
1583 extern int git_config_string(const char **, const char *, const char *);
1584 extern int git_config_pathname(const char **, const char *, const char *);
1585 extern int git_config_set_in_file_gently(const char *, const char *, const char *);
1586 extern void git_config_set_in_file(const char *, const char *, const char *);
1587 extern int git_config_set_gently(const char *, const char *);
1588 extern void git_config_set(const char *, const char *);
1589 extern int git_config_parse_key(const char *, char **, int *);
1590 extern int git_config_key_is_valid(const char *key);
1591 extern int git_config_set_multivar_gently(const char *, const char *, const char *, int);
1592 extern void git_config_set_multivar(const char *, const char *, const char *, int);
1593 extern int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, int);
1594 extern void git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
1595 extern int git_config_rename_section(const char *, const char *);
1596 extern int git_config_rename_section_in_file(const char *, const char *, const char *);
1597 extern const char *git_etc_gitconfig(void);
1598 extern int git_env_bool(const char *, int);
1599 extern unsigned long git_env_ulong(const char *, unsigned long);
1600 extern int git_config_system(void);
1601 extern int config_error_nonbool(const char *);
1602 #if defined(__GNUC__)
1603 #define config_error_nonbool(s) (config_error_nonbool(s), const_error())
1604 #endif
1605 extern const char *get_log_output_encoding(void);
1606 extern const char *get_commit_output_encoding(void);
1607
1608 extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
1609 extern const char *current_config_origin_type(void);
1610 extern const char *current_config_name(void);
1611
1612 struct config_include_data {
1613 int depth;
1614 config_fn_t fn;
1615 void *data;
1616 };
1617 #define CONFIG_INCLUDE_INIT { 0 }
1618 extern int git_config_include(const char *name, const char *value, void *data);
1619
1620 /*
1621 * Match and parse a config key of the form:
1622 *
1623 * section.(subsection.)?key
1624 *
1625 * (i.e., what gets handed to a config_fn_t). The caller provides the section;
1626 * we return -1 if it does not match, 0 otherwise. The subsection and key
1627 * out-parameters are filled by the function (and subsection is NULL if it is
1628 * missing).
1629 */
1630 extern int parse_config_key(const char *var,
1631 const char *section,
1632 const char **subsection, int *subsection_len,
1633 const char **key);
1634
1635 struct config_set_element {
1636 struct hashmap_entry ent;
1637 char *key;
1638 struct string_list value_list;
1639 };
1640
1641 struct configset_list_item {
1642 struct config_set_element *e;
1643 int value_index;
1644 };
1645
1646 /*
1647 * the contents of the list are ordered according to their
1648 * position in the config files and order of parsing the files.
1649 * (i.e. key-value pair at the last position of .git/config will
1650 * be at the last item of the list)
1651 */
1652 struct configset_list {
1653 struct configset_list_item *items;
1654 unsigned int nr, alloc;
1655 };
1656
1657 struct config_set {
1658 struct hashmap config_hash;
1659 int hash_initialized;
1660 struct configset_list list;
1661 };
1662
1663 extern void git_configset_init(struct config_set *cs);
1664 extern int git_configset_add_file(struct config_set *cs, const char *filename);
1665 extern int git_configset_get_value(struct config_set *cs, const char *key, const char **value);
1666 extern const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key);
1667 extern void git_configset_clear(struct config_set *cs);
1668 extern int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest);
1669 extern int git_configset_get_string(struct config_set *cs, const char *key, char **dest);
1670 extern int git_configset_get_int(struct config_set *cs, const char *key, int *dest);
1671 extern int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest);
1672 extern int git_configset_get_bool(struct config_set *cs, const char *key, int *dest);
1673 extern int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest);
1674 extern int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest);
1675 extern int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest);
1676
1677 extern int git_config_get_value(const char *key, const char **value);
1678 extern const struct string_list *git_config_get_value_multi(const char *key);
1679 extern void git_config_clear(void);
1680 extern void git_config_iter(config_fn_t fn, void *data);
1681 extern int git_config_get_string_const(const char *key, const char **dest);
1682 extern int git_config_get_string(const char *key, char **dest);
1683 extern int git_config_get_int(const char *key, int *dest);
1684 extern int git_config_get_ulong(const char *key, unsigned long *dest);
1685 extern int git_config_get_bool(const char *key, int *dest);
1686 extern int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
1687 extern int git_config_get_maybe_bool(const char *key, int *dest);
1688 extern int git_config_get_pathname(const char *key, const char **dest);
1689 extern int git_config_get_untracked_cache(void);
1690
1691 /*
1692 * This is a hack for test programs like test-dump-untracked-cache to
1693 * ensure that they do not modify the untracked cache when reading it.
1694 * Do not use it otherwise!
1695 */
1696 extern int ignore_untracked_cache_config;
1697
1698 struct key_value_info {
1699 const char *filename;
1700 int linenr;
1701 };
1702
1703 extern NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3)));
1704 extern NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr);
1705
1706 extern int committer_ident_sufficiently_given(void);
1707 extern int author_ident_sufficiently_given(void);
1708
1709 extern const char *git_commit_encoding;
1710 extern const char *git_log_output_encoding;
1711 extern const char *git_mailmap_file;
1712 extern const char *git_mailmap_blob;
1713
1714 /* IO helper functions */
1715 extern void maybe_flush_or_die(FILE *, const char *);
1716 __attribute__((format (printf, 2, 3)))
1717 extern void fprintf_or_die(FILE *, const char *fmt, ...);
1718
1719 #define COPY_READ_ERROR (-2)
1720 #define COPY_WRITE_ERROR (-3)
1721 extern int copy_fd(int ifd, int ofd);
1722 extern int copy_file(const char *dst, const char *src, int mode);
1723 extern int copy_file_with_time(const char *dst, const char *src, int mode);
1724
1725 extern void write_or_die(int fd, const void *buf, size_t count);
1726 extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
1727 extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
1728 extern void fsync_or_die(int fd, const char *);
1729
1730 extern ssize_t read_in_full(int fd, void *buf, size_t count);
1731 extern ssize_t write_in_full(int fd, const void *buf, size_t count);
1732 extern ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset);
1733
1734 static inline ssize_t write_str_in_full(int fd, const char *str)
1735 {
1736 return write_in_full(fd, str, strlen(str));
1737 }
1738
1739 extern int write_file(const char *path, const char *fmt, ...);
1740 extern int write_file_gently(const char *path, const char *fmt, ...);
1741
1742 /* pager.c */
1743 extern void setup_pager(void);
1744 extern const char *pager_program;
1745 extern int pager_in_use(void);
1746 extern int pager_use_color;
1747 extern int term_columns(void);
1748 extern int decimal_width(uintmax_t);
1749 extern int check_pager_config(const char *cmd);
1750 extern void prepare_pager_args(struct child_process *, const char *pager);
1751
1752 extern const char *editor_program;
1753 extern const char *askpass_program;
1754 extern const char *excludes_file;
1755
1756 /* base85 */
1757 int decode_85(char *dst, const char *line, int linelen);
1758 void encode_85(char *buf, const unsigned char *data, int bytes);
1759
1760 /* alloc.c */
1761 extern void *alloc_blob_node(void);
1762 extern void *alloc_tree_node(void);
1763 extern void *alloc_commit_node(void);
1764 extern void *alloc_tag_node(void);
1765 extern void *alloc_object_node(void);
1766 extern void alloc_report(void);
1767 extern unsigned int alloc_commit_index(void);
1768
1769 /* pkt-line.c */
1770 void packet_trace_identity(const char *prog);
1771
1772 /* add */
1773 /*
1774 * return 0 if success, 1 - if addition of a file failed and
1775 * ADD_FILES_IGNORE_ERRORS was specified in flags
1776 */
1777 int add_files_to_cache(const char *prefix, const struct pathspec *pathspec, int flags);
1778
1779 /* diff.c */
1780 extern int diff_auto_refresh_index;
1781
1782 /* match-trees.c */
1783 void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
1784 void shift_tree_by(const unsigned char *, const unsigned char *, unsigned char *, const char *);
1785
1786 /*
1787 * whitespace rules.
1788 * used by both diff and apply
1789 * last two digits are tab width
1790 */
1791 #define WS_BLANK_AT_EOL 0100
1792 #define WS_SPACE_BEFORE_TAB 0200
1793 #define WS_INDENT_WITH_NON_TAB 0400
1794 #define WS_CR_AT_EOL 01000
1795 #define WS_BLANK_AT_EOF 02000
1796 #define WS_TAB_IN_INDENT 04000
1797 #define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
1798 #define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
1799 #define WS_TAB_WIDTH_MASK 077
1800 extern unsigned whitespace_rule_cfg;
1801 extern unsigned whitespace_rule(const char *);
1802 extern unsigned parse_whitespace_rule(const char *);
1803 extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
1804 extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
1805 extern char *whitespace_error_string(unsigned ws);
1806 extern void ws_fix_copy(struct strbuf *, const char *, int, unsigned, int *);
1807 extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
1808 #define ws_tab_width(rule) ((rule) & WS_TAB_WIDTH_MASK)
1809
1810 /* ls-files */
1811 void overlay_tree_on_cache(const char *tree_name, const char *prefix);
1812
1813 char *alias_lookup(const char *alias);
1814 int split_cmdline(char *cmdline, const char ***argv);
1815 /* Takes a negative value returned by split_cmdline */
1816 const char *split_cmdline_strerror(int cmdline_errno);
1817
1818 /* setup.c */
1819 struct startup_info {
1820 int have_repository;
1821 const char *prefix;
1822 };
1823 extern struct startup_info *startup_info;
1824
1825 /* merge.c */
1826 struct commit_list;
1827 int try_merge_command(const char *strategy, size_t xopts_nr,
1828 const char **xopts, struct commit_list *common,
1829 const char *head_arg, struct commit_list *remotes);
1830 int checkout_fast_forward(const unsigned char *from,
1831 const unsigned char *to,
1832 int overwrite_ignore);
1833
1834
1835 int sane_execvp(const char *file, char *const argv[]);
1836
1837 /*
1838 * A struct to encapsulate the concept of whether a file has changed
1839 * since we last checked it. This uses criteria similar to those used
1840 * for the index.
1841 */
1842 struct stat_validity {
1843 struct stat_data *sd;
1844 };
1845
1846 void stat_validity_clear(struct stat_validity *sv);
1847
1848 /*
1849 * Returns 1 if the path is a regular file (or a symlink to a regular
1850 * file) and matches the saved stat_validity, 0 otherwise. A missing
1851 * or inaccessible file is considered a match if the struct was just
1852 * initialized, or if the previous update found an inaccessible file.
1853 */
1854 int stat_validity_check(struct stat_validity *sv, const char *path);
1855
1856 /*
1857 * Update the stat_validity from a file opened at descriptor fd. If
1858 * the file is missing, inaccessible, or not a regular file, then
1859 * future calls to stat_validity_check will match iff one of those
1860 * conditions continues to be true.
1861 */
1862 void stat_validity_update(struct stat_validity *sv, int fd);
1863
1864 int versioncmp(const char *s1, const char *s2);
1865 void sleep_millisec(int millisec);
1866
1867 /*
1868 * Create a directory and (if share is nonzero) adjust its permissions
1869 * according to the shared_repository setting. Only use this for
1870 * directories under $GIT_DIR. Don't use it for working tree
1871 * directories.
1872 */
1873 void safe_create_dir(const char *dir, int share);
1874
1875 #endif /* CACHE_H */