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lstat_cache(): generalise longest_match_lstat_cache()
[thirdparty/git.git] / cache.h
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1#ifndef CACHE_H
2#define CACHE_H
3
4#include "git-compat-util.h"
5#include "strbuf.h"
6#include "hash.h"
7
8#include SHA1_HEADER
9#ifndef git_SHA_CTX
10#define git_SHA_CTX SHA_CTX
11#define git_SHA1_Init SHA1_Init
12#define git_SHA1_Update SHA1_Update
13#define git_SHA1_Final SHA1_Final
14#endif
15
16#include <zlib.h>
17#if defined(NO_DEFLATE_BOUND) || ZLIB_VERNUM < 0x1200
18#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
19#endif
20
21void git_inflate_init(z_streamp strm);
22void git_inflate_end(z_streamp strm);
23int git_inflate(z_streamp strm, int flush);
24
25#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT)
26#define DTYPE(de) ((de)->d_type)
27#else
28#undef DT_UNKNOWN
29#undef DT_DIR
30#undef DT_REG
31#undef DT_LNK
32#define DT_UNKNOWN 0
33#define DT_DIR 1
34#define DT_REG 2
35#define DT_LNK 3
36#define DTYPE(de) DT_UNKNOWN
37#endif
38
39/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */
40#define S_IFINVALID 0030000
41
42/*
43 * A "directory link" is a link to another git directory.
44 *
45 * The value 0160000 is not normally a valid mode, and
46 * also just happens to be S_IFDIR + S_IFLNK
47 *
48 * NOTE! We *really* shouldn't depend on the S_IFxxx macros
49 * always having the same values everywhere. We should use
50 * our internal git values for these things, and then we can
51 * translate that to the OS-specific value. It just so
52 * happens that everybody shares the same bit representation
53 * in the UNIX world (and apparently wider too..)
54 */
55#define S_IFGITLINK 0160000
56#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
57
58/*
59 * Intensive research over the course of many years has shown that
60 * port 9418 is totally unused by anything else. Or
61 *
62 * Your search - "port 9418" - did not match any documents.
63 *
64 * as www.google.com puts it.
65 *
66 * This port has been properly assigned for git use by IANA:
67 * git (Assigned-9418) [I06-050728-0001].
68 *
69 * git 9418/tcp git pack transfer service
70 * git 9418/udp git pack transfer service
71 *
72 * with Linus Torvalds <torvalds@osdl.org> as the point of
73 * contact. September 2005.
74 *
75 * See http://www.iana.org/assignments/port-numbers
76 */
77#define DEFAULT_GIT_PORT 9418
78
79/*
80 * Basic data structures for the directory cache
81 */
82
83#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
84struct cache_header {
85 unsigned int hdr_signature;
86 unsigned int hdr_version;
87 unsigned int hdr_entries;
88};
89
90/*
91 * The "cache_time" is just the low 32 bits of the
92 * time. It doesn't matter if it overflows - we only
93 * check it for equality in the 32 bits we save.
94 */
95struct cache_time {
96 unsigned int sec;
97 unsigned int nsec;
98};
99
100/*
101 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
102 * Again - this is just a (very strong in practice) heuristic that
103 * the inode hasn't changed.
104 *
105 * We save the fields in big-endian order to allow using the
106 * index file over NFS transparently.
107 */
108struct ondisk_cache_entry {
109 struct cache_time ctime;
110 struct cache_time mtime;
111 unsigned int dev;
112 unsigned int ino;
113 unsigned int mode;
114 unsigned int uid;
115 unsigned int gid;
116 unsigned int size;
117 unsigned char sha1[20];
118 unsigned short flags;
119 char name[FLEX_ARRAY]; /* more */
120};
121
122/*
123 * This struct is used when CE_EXTENDED bit is 1
124 * The struct must match ondisk_cache_entry exactly from
125 * ctime till flags
126 */
127struct ondisk_cache_entry_extended {
128 struct cache_time ctime;
129 struct cache_time mtime;
130 unsigned int dev;
131 unsigned int ino;
132 unsigned int mode;
133 unsigned int uid;
134 unsigned int gid;
135 unsigned int size;
136 unsigned char sha1[20];
137 unsigned short flags;
138 unsigned short flags2;
139 char name[FLEX_ARRAY]; /* more */
140};
141
142struct cache_entry {
143 unsigned int ce_ctime;
144 unsigned int ce_mtime;
145 unsigned int ce_dev;
146 unsigned int ce_ino;
147 unsigned int ce_mode;
148 unsigned int ce_uid;
149 unsigned int ce_gid;
150 unsigned int ce_size;
151 unsigned int ce_flags;
152 unsigned char sha1[20];
153 struct cache_entry *next;
154 char name[FLEX_ARRAY]; /* more */
155};
156
157#define CE_NAMEMASK (0x0fff)
158#define CE_STAGEMASK (0x3000)
159#define CE_EXTENDED (0x4000)
160#define CE_VALID (0x8000)
161#define CE_STAGESHIFT 12
162
163/*
164 * Range 0xFFFF0000 in ce_flags is divided into
165 * two parts: in-memory flags and on-disk ones.
166 * Flags in CE_EXTENDED_FLAGS will get saved on-disk
167 * if you want to save a new flag, add it in
168 * CE_EXTENDED_FLAGS
169 *
170 * In-memory only flags
171 */
172#define CE_UPDATE (0x10000)
173#define CE_REMOVE (0x20000)
174#define CE_UPTODATE (0x40000)
175#define CE_ADDED (0x80000)
176
177#define CE_HASHED (0x100000)
178#define CE_UNHASHED (0x200000)
179
180/*
181 * Extended on-disk flags
182 */
183#define CE_INTENT_TO_ADD 0x20000000
184/* CE_EXTENDED2 is for future extension */
185#define CE_EXTENDED2 0x80000000
186
187#define CE_EXTENDED_FLAGS (CE_INTENT_TO_ADD)
188
189/*
190 * Safeguard to avoid saving wrong flags:
191 * - CE_EXTENDED2 won't get saved until its semantic is known
192 * - Bits in 0x0000FFFF have been saved in ce_flags already
193 * - Bits in 0x003F0000 are currently in-memory flags
194 */
195#if CE_EXTENDED_FLAGS & 0x803FFFFF
196#error "CE_EXTENDED_FLAGS out of range"
197#endif
198
199/*
200 * Copy the sha1 and stat state of a cache entry from one to
201 * another. But we never change the name, or the hash state!
202 */
203#define CE_STATE_MASK (CE_HASHED | CE_UNHASHED)
204static inline void copy_cache_entry(struct cache_entry *dst, struct cache_entry *src)
205{
206 unsigned int state = dst->ce_flags & CE_STATE_MASK;
207
208 /* Don't copy hash chain and name */
209 memcpy(dst, src, offsetof(struct cache_entry, next));
210
211 /* Restore the hash state */
212 dst->ce_flags = (dst->ce_flags & ~CE_STATE_MASK) | state;
213}
214
215static inline unsigned create_ce_flags(size_t len, unsigned stage)
216{
217 if (len >= CE_NAMEMASK)
218 len = CE_NAMEMASK;
219 return (len | (stage << CE_STAGESHIFT));
220}
221
222static inline size_t ce_namelen(const struct cache_entry *ce)
223{
224 size_t len = ce->ce_flags & CE_NAMEMASK;
225 if (len < CE_NAMEMASK)
226 return len;
227 return strlen(ce->name + CE_NAMEMASK) + CE_NAMEMASK;
228}
229
230#define ce_size(ce) cache_entry_size(ce_namelen(ce))
231#define ondisk_ce_size(ce) (((ce)->ce_flags & CE_EXTENDED) ? \
232 ondisk_cache_entry_extended_size(ce_namelen(ce)) : \
233 ondisk_cache_entry_size(ce_namelen(ce)))
234#define ce_stage(ce) ((CE_STAGEMASK & (ce)->ce_flags) >> CE_STAGESHIFT)
235#define ce_uptodate(ce) ((ce)->ce_flags & CE_UPTODATE)
236#define ce_mark_uptodate(ce) ((ce)->ce_flags |= CE_UPTODATE)
237
238#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
239static inline unsigned int create_ce_mode(unsigned int mode)
240{
241 if (S_ISLNK(mode))
242 return S_IFLNK;
243 if (S_ISDIR(mode) || S_ISGITLINK(mode))
244 return S_IFGITLINK;
245 return S_IFREG | ce_permissions(mode);
246}
247static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode)
248{
249 extern int trust_executable_bit, has_symlinks;
250 if (!has_symlinks && S_ISREG(mode) &&
251 ce && S_ISLNK(ce->ce_mode))
252 return ce->ce_mode;
253 if (!trust_executable_bit && S_ISREG(mode)) {
254 if (ce && S_ISREG(ce->ce_mode))
255 return ce->ce_mode;
256 return create_ce_mode(0666);
257 }
258 return create_ce_mode(mode);
259}
260static inline int ce_to_dtype(const struct cache_entry *ce)
261{
262 unsigned ce_mode = ntohl(ce->ce_mode);
263 if (S_ISREG(ce_mode))
264 return DT_REG;
265 else if (S_ISDIR(ce_mode) || S_ISGITLINK(ce_mode))
266 return DT_DIR;
267 else if (S_ISLNK(ce_mode))
268 return DT_LNK;
269 else
270 return DT_UNKNOWN;
271}
272#define canon_mode(mode) \
273 (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \
274 S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK)
275
276#define flexible_size(STRUCT,len) ((offsetof(struct STRUCT,name) + (len) + 8) & ~7)
277#define cache_entry_size(len) flexible_size(cache_entry,len)
278#define ondisk_cache_entry_size(len) flexible_size(ondisk_cache_entry,len)
279#define ondisk_cache_entry_extended_size(len) flexible_size(ondisk_cache_entry_extended,len)
280
281struct index_state {
282 struct cache_entry **cache;
283 unsigned int cache_nr, cache_alloc, cache_changed;
284 struct cache_tree *cache_tree;
285 time_t timestamp;
286 void *alloc;
287 unsigned name_hash_initialized : 1,
288 initialized : 1;
289 struct hash_table name_hash;
290};
291
292extern struct index_state the_index;
293
294/* Name hashing */
295extern void add_name_hash(struct index_state *istate, struct cache_entry *ce);
296/*
297 * We don't actually *remove* it, we can just mark it invalid so that
298 * we won't find it in lookups.
299 *
300 * Not only would we have to search the lists (simple enough), but
301 * we'd also have to rehash other hash buckets in case this makes the
302 * hash bucket empty (common). So it's much better to just mark
303 * it.
304 */
305static inline void remove_name_hash(struct cache_entry *ce)
306{
307 ce->ce_flags |= CE_UNHASHED;
308}
309
310
311#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS
312#define active_cache (the_index.cache)
313#define active_nr (the_index.cache_nr)
314#define active_alloc (the_index.cache_alloc)
315#define active_cache_changed (the_index.cache_changed)
316#define active_cache_tree (the_index.cache_tree)
317
318#define read_cache() read_index(&the_index)
319#define read_cache_from(path) read_index_from(&the_index, (path))
320#define read_cache_preload(pathspec) read_index_preload(&the_index, (pathspec))
321#define is_cache_unborn() is_index_unborn(&the_index)
322#define read_cache_unmerged() read_index_unmerged(&the_index)
323#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd))
324#define discard_cache() discard_index(&the_index)
325#define unmerged_cache() unmerged_index(&the_index)
326#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen))
327#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option))
328#define rename_cache_entry_at(pos, new_name) rename_index_entry_at(&the_index, (pos), (new_name))
329#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos))
330#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path))
331#define add_to_cache(path, st, flags) add_to_index(&the_index, (path), (st), (flags))
332#define add_file_to_cache(path, flags) add_file_to_index(&the_index, (path), (flags))
333#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL)
334#define ce_match_stat(ce, st, options) ie_match_stat(&the_index, (ce), (st), (options))
335#define ce_modified(ce, st, options) ie_modified(&the_index, (ce), (st), (options))
336#define cache_name_exists(name, namelen, igncase) index_name_exists(&the_index, (name), (namelen), (igncase))
337#define cache_name_is_other(name, namelen) index_name_is_other(&the_index, (name), (namelen))
338#endif
339
340enum object_type {
341 OBJ_BAD = -1,
342 OBJ_NONE = 0,
343 OBJ_COMMIT = 1,
344 OBJ_TREE = 2,
345 OBJ_BLOB = 3,
346 OBJ_TAG = 4,
347 /* 5 for future expansion */
348 OBJ_OFS_DELTA = 6,
349 OBJ_REF_DELTA = 7,
350 OBJ_ANY,
351 OBJ_MAX,
352};
353
354static inline enum object_type object_type(unsigned int mode)
355{
356 return S_ISDIR(mode) ? OBJ_TREE :
357 S_ISGITLINK(mode) ? OBJ_COMMIT :
358 OBJ_BLOB;
359}
360
361#define GIT_DIR_ENVIRONMENT "GIT_DIR"
362#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE"
363#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
364#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
365#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
366#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
367#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR"
368#define CONFIG_ENVIRONMENT "GIT_CONFIG"
369#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH"
370#define CEILING_DIRECTORIES_ENVIRONMENT "GIT_CEILING_DIRECTORIES"
371#define GITATTRIBUTES_FILE ".gitattributes"
372#define INFOATTRIBUTES_FILE "info/attributes"
373#define ATTRIBUTE_MACRO_PREFIX "[attr]"
374#define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
375#define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
376
377extern int is_bare_repository_cfg;
378extern int is_bare_repository(void);
379extern int is_inside_git_dir(void);
380extern char *git_work_tree_cfg;
381extern int is_inside_work_tree(void);
382extern int have_git_dir(void);
383extern const char *get_git_dir(void);
384extern char *get_object_directory(void);
385extern char *get_index_file(void);
386extern char *get_graft_file(void);
387extern int set_git_dir(const char *path);
388extern const char *get_git_work_tree(void);
389extern const char *read_gitfile_gently(const char *path);
390extern void set_git_work_tree(const char *tree);
391
392#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
393
394extern const char **get_pathspec(const char *prefix, const char **pathspec);
395extern void setup_work_tree(void);
396extern const char *setup_git_directory_gently(int *);
397extern const char *setup_git_directory(void);
398extern const char *prefix_path(const char *prefix, int len, const char *path);
399extern const char *prefix_filename(const char *prefix, int len, const char *path);
400extern void verify_filename(const char *prefix, const char *name);
401extern void verify_non_filename(const char *prefix, const char *name);
402
403#define INIT_DB_QUIET 0x0001
404
405extern int init_db(const char *template_dir, unsigned int flags);
406
407#define alloc_nr(x) (((x)+16)*3/2)
408
409/*
410 * Realloc the buffer pointed at by variable 'x' so that it can hold
411 * at least 'nr' entries; the number of entries currently allocated
412 * is 'alloc', using the standard growing factor alloc_nr() macro.
413 *
414 * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
415 */
416#define ALLOC_GROW(x, nr, alloc) \
417 do { \
418 if ((nr) > alloc) { \
419 if (alloc_nr(alloc) < (nr)) \
420 alloc = (nr); \
421 else \
422 alloc = alloc_nr(alloc); \
423 x = xrealloc((x), alloc * sizeof(*(x))); \
424 } \
425 } while(0)
426
427/* Initialize and use the cache information */
428extern int read_index(struct index_state *);
429extern int read_index_preload(struct index_state *, const char **pathspec);
430extern int read_index_from(struct index_state *, const char *path);
431extern int is_index_unborn(struct index_state *);
432extern int read_index_unmerged(struct index_state *);
433extern int write_index(const struct index_state *, int newfd);
434extern int discard_index(struct index_state *);
435extern int unmerged_index(const struct index_state *);
436extern int verify_path(const char *path);
437extern struct cache_entry *index_name_exists(struct index_state *istate, const char *name, int namelen, int igncase);
438extern int index_name_pos(const struct index_state *, const char *name, int namelen);
439#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
440#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
441#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
442#define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */
443#define ADD_CACHE_NEW_ONLY 16 /* Do not replace existing ones */
444extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option);
445extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really);
446extern void rename_index_entry_at(struct index_state *, int pos, const char *new_name);
447extern int remove_index_entry_at(struct index_state *, int pos);
448extern int remove_file_from_index(struct index_state *, const char *path);
449#define ADD_CACHE_VERBOSE 1
450#define ADD_CACHE_PRETEND 2
451#define ADD_CACHE_IGNORE_ERRORS 4
452#define ADD_CACHE_IGNORE_REMOVAL 8
453#define ADD_CACHE_INTENT 16
454extern int add_to_index(struct index_state *, const char *path, struct stat *, int flags);
455extern int add_file_to_index(struct index_state *, const char *path, int flags);
456extern struct cache_entry *make_cache_entry(unsigned int mode, const unsigned char *sha1, const char *path, int stage, int refresh);
457extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
458extern int index_name_is_other(const struct index_state *, const char *, int);
459
460/* do stat comparison even if CE_VALID is true */
461#define CE_MATCH_IGNORE_VALID 01
462/* do not check the contents but report dirty on racily-clean entries */
463#define CE_MATCH_RACY_IS_DIRTY 02
464extern int ie_match_stat(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
465extern int ie_modified(const struct index_state *, struct cache_entry *, struct stat *, unsigned int);
466
467extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
468extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, enum object_type type, const char *path);
469extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
470extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
471
472#define REFRESH_REALLY 0x0001 /* ignore_valid */
473#define REFRESH_UNMERGED 0x0002 /* allow unmerged */
474#define REFRESH_QUIET 0x0004 /* be quiet about it */
475#define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */
476#define REFRESH_IGNORE_SUBMODULES 0x0010 /* ignore submodules */
477#define REFRESH_SAY_CHANGED 0x0020 /* say "changed" not "needs update" */
478extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen);
479
480struct lock_file {
481 struct lock_file *next;
482 int fd;
483 pid_t owner;
484 char on_list;
485 char filename[PATH_MAX];
486};
487#define LOCK_DIE_ON_ERROR 1
488#define LOCK_NODEREF 2
489extern int hold_lock_file_for_update(struct lock_file *, const char *path, int);
490extern int hold_lock_file_for_append(struct lock_file *, const char *path, int);
491extern int commit_lock_file(struct lock_file *);
492
493extern int hold_locked_index(struct lock_file *, int);
494extern int commit_locked_index(struct lock_file *);
495extern void set_alternate_index_output(const char *);
496extern int close_lock_file(struct lock_file *);
497extern void rollback_lock_file(struct lock_file *);
498extern int delete_ref(const char *, const unsigned char *sha1, int delopt);
499
500/* Environment bits from configuration mechanism */
501extern int trust_executable_bit;
502extern int trust_ctime;
503extern int quote_path_fully;
504extern int has_symlinks;
505extern int ignore_case;
506extern int assume_unchanged;
507extern int prefer_symlink_refs;
508extern int log_all_ref_updates;
509extern int warn_ambiguous_refs;
510extern int shared_repository;
511extern const char *apply_default_whitespace;
512extern int zlib_compression_level;
513extern int core_compression_level;
514extern int core_compression_seen;
515extern size_t packed_git_window_size;
516extern size_t packed_git_limit;
517extern size_t delta_base_cache_limit;
518extern int auto_crlf;
519extern int fsync_object_files;
520extern int core_preload_index;
521
522enum safe_crlf {
523 SAFE_CRLF_FALSE = 0,
524 SAFE_CRLF_FAIL = 1,
525 SAFE_CRLF_WARN = 2,
526};
527
528extern enum safe_crlf safe_crlf;
529
530enum branch_track {
531 BRANCH_TRACK_UNSPECIFIED = -1,
532 BRANCH_TRACK_NEVER = 0,
533 BRANCH_TRACK_REMOTE,
534 BRANCH_TRACK_ALWAYS,
535 BRANCH_TRACK_EXPLICIT,
536};
537
538enum rebase_setup_type {
539 AUTOREBASE_NEVER = 0,
540 AUTOREBASE_LOCAL,
541 AUTOREBASE_REMOTE,
542 AUTOREBASE_ALWAYS,
543};
544
545extern enum branch_track git_branch_track;
546extern enum rebase_setup_type autorebase;
547extern char *notes_ref_name;
548
549#define GIT_REPO_VERSION 0
550extern int repository_format_version;
551extern int check_repository_format(void);
552
553#define MTIME_CHANGED 0x0001
554#define CTIME_CHANGED 0x0002
555#define OWNER_CHANGED 0x0004
556#define MODE_CHANGED 0x0008
557#define INODE_CHANGED 0x0010
558#define DATA_CHANGED 0x0020
559#define TYPE_CHANGED 0x0040
560
561extern char *mksnpath(char *buf, size_t n, const char *fmt, ...)
562 __attribute__((format (printf, 3, 4)));
563extern char *git_snpath(char *buf, size_t n, const char *fmt, ...)
564 __attribute__((format (printf, 3, 4)));
565extern char *git_pathdup(const char *fmt, ...)
566 __attribute__((format (printf, 1, 2)));
567
568/* Return a statically allocated filename matching the sha1 signature */
569extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
570extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
571extern char *sha1_file_name(const unsigned char *sha1);
572extern char *sha1_pack_name(const unsigned char *sha1);
573extern char *sha1_pack_index_name(const unsigned char *sha1);
574extern const char *find_unique_abbrev(const unsigned char *sha1, int);
575extern const unsigned char null_sha1[20];
576static inline int is_null_sha1(const unsigned char *sha1)
577{
578 return !memcmp(sha1, null_sha1, 20);
579}
580static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
581{
582 return memcmp(sha1, sha2, 20);
583}
584static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
585{
586 memcpy(sha_dst, sha_src, 20);
587}
588static inline void hashclr(unsigned char *hash)
589{
590 memset(hash, 0, 20);
591}
592extern int is_empty_blob_sha1(const unsigned char *sha1);
593
594#define EMPTY_TREE_SHA1_HEX \
595 "4b825dc642cb6eb9a060e54bf8d69288fbee4904"
596#define EMPTY_TREE_SHA1_BIN \
597 "\x4b\x82\x5d\xc6\x42\xcb\x6e\xb9\xa0\x60" \
598 "\xe5\x4b\xf8\xd6\x92\x88\xfb\xee\x49\x04"
599
600int git_mkstemp(char *path, size_t n, const char *template);
601
602/*
603 * NOTE NOTE NOTE!!
604 *
605 * PERM_UMASK, OLD_PERM_GROUP and OLD_PERM_EVERYBODY enumerations must
606 * not be changed. Old repositories have core.sharedrepository written in
607 * numeric format, and therefore these values are preserved for compatibility
608 * reasons.
609 */
610enum sharedrepo {
611 PERM_UMASK = 0,
612 OLD_PERM_GROUP = 1,
613 OLD_PERM_EVERYBODY = 2,
614 PERM_GROUP = 0660,
615 PERM_EVERYBODY = 0664,
616};
617int git_config_perm(const char *var, const char *value);
618int adjust_shared_perm(const char *path);
619int safe_create_leading_directories(char *path);
620int safe_create_leading_directories_const(const char *path);
621char *enter_repo(char *path, int strict);
622static inline int is_absolute_path(const char *path)
623{
624 return path[0] == '/' || has_dos_drive_prefix(path);
625}
626int is_directory(const char *);
627const char *make_absolute_path(const char *path);
628const char *make_nonrelative_path(const char *path);
629const char *make_relative_path(const char *abs, const char *base);
630int normalize_absolute_path(char *buf, const char *path);
631int longest_ancestor_length(const char *path, const char *prefix_list);
632
633/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
634extern int sha1_object_info(const unsigned char *, unsigned long *);
635extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size);
636extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1);
637extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
638extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *);
639extern int force_object_loose(const unsigned char *sha1, time_t mtime);
640
641/* global flag to enable extra checks when accessing packed objects */
642extern int do_check_packed_object_crc;
643
644extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
645
646extern int move_temp_to_file(const char *tmpfile, const char *filename);
647
648extern int has_sha1_pack(const unsigned char *sha1, const char **ignore);
649extern int has_sha1_file(const unsigned char *sha1);
650extern int has_loose_object_nonlocal(const unsigned char *sha1);
651
652extern int has_pack_file(const unsigned char *sha1);
653extern int has_pack_index(const unsigned char *sha1);
654
655extern const signed char hexval_table[256];
656static inline unsigned int hexval(unsigned char c)
657{
658 return hexval_table[c];
659}
660
661/* Convert to/from hex/sha1 representation */
662#define MINIMUM_ABBREV 4
663#define DEFAULT_ABBREV 7
664
665extern int get_sha1(const char *str, unsigned char *sha1);
666extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode);
667extern int get_sha1_hex(const char *hex, unsigned char *sha1);
668extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
669extern int read_ref(const char *filename, unsigned char *sha1);
670extern const char *resolve_ref(const char *path, unsigned char *sha1, int, int *);
671extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref);
672extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref);
673extern int interpret_nth_last_branch(const char *str, struct strbuf *);
674
675extern int refname_match(const char *abbrev_name, const char *full_name, const char **rules);
676extern const char *ref_rev_parse_rules[];
677extern const char *ref_fetch_rules[];
678
679extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg);
680extern int validate_headref(const char *ref);
681
682extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
683extern int df_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
684extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
685
686extern void *read_object_with_reference(const unsigned char *sha1,
687 const char *required_type,
688 unsigned long *size,
689 unsigned char *sha1_ret);
690
691extern struct object *peel_to_type(const char *name, int namelen,
692 struct object *o, enum object_type);
693
694enum date_mode {
695 DATE_NORMAL = 0,
696 DATE_RELATIVE,
697 DATE_SHORT,
698 DATE_LOCAL,
699 DATE_ISO8601,
700 DATE_RFC2822
701};
702
703const char *show_date(unsigned long time, int timezone, enum date_mode mode);
704int parse_date(const char *date, char *buf, int bufsize);
705void datestamp(char *buf, int bufsize);
706unsigned long approxidate(const char *);
707enum date_mode parse_date_format(const char *format);
708
709#define IDENT_WARN_ON_NO_NAME 1
710#define IDENT_ERROR_ON_NO_NAME 2
711#define IDENT_NO_DATE 4
712extern const char *git_author_info(int);
713extern const char *git_committer_info(int);
714extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int);
715extern const char *fmt_name(const char *name, const char *email);
716
717struct checkout {
718 const char *base_dir;
719 int base_dir_len;
720 unsigned force:1,
721 quiet:1,
722 not_new:1,
723 refresh_cache:1;
724};
725
726extern int checkout_entry(struct cache_entry *ce, const struct checkout *state, char *topath);
727extern int has_symlink_leading_path(int len, const char *name);
728extern int has_symlink_or_noent_leading_path(int len, const char *name);
729extern int has_dirs_only_path(int len, const char *name, int prefix_len);
730extern void invalidate_lstat_cache(int len, const char *name);
731extern void clear_lstat_cache(void);
732
733extern struct alternate_object_database {
734 struct alternate_object_database *next;
735 char *name;
736 char base[FLEX_ARRAY]; /* more */
737} *alt_odb_list;
738extern void prepare_alt_odb(void);
739extern void add_to_alternates_file(const char *reference);
740typedef int alt_odb_fn(struct alternate_object_database *, void *);
741extern void foreach_alt_odb(alt_odb_fn, void*);
742
743struct pack_window {
744 struct pack_window *next;
745 unsigned char *base;
746 off_t offset;
747 size_t len;
748 unsigned int last_used;
749 unsigned int inuse_cnt;
750};
751
752extern struct packed_git {
753 struct packed_git *next;
754 struct pack_window *windows;
755 off_t pack_size;
756 const void *index_data;
757 size_t index_size;
758 uint32_t num_objects;
759 uint32_t num_bad_objects;
760 unsigned char *bad_object_sha1;
761 int index_version;
762 time_t mtime;
763 int pack_fd;
764 unsigned pack_local:1,
765 pack_keep:1;
766 unsigned char sha1[20];
767 /* something like ".git/objects/pack/xxxxx.pack" */
768 char pack_name[FLEX_ARRAY]; /* more */
769} *packed_git;
770
771struct pack_entry {
772 off_t offset;
773 unsigned char sha1[20];
774 struct packed_git *p;
775};
776
777struct ref {
778 struct ref *next;
779 unsigned char old_sha1[20];
780 unsigned char new_sha1[20];
781 char *symref;
782 unsigned int force:1,
783 merge:1,
784 nonfastforward:1,
785 deletion:1;
786 enum {
787 REF_STATUS_NONE = 0,
788 REF_STATUS_OK,
789 REF_STATUS_REJECT_NONFASTFORWARD,
790 REF_STATUS_REJECT_NODELETE,
791 REF_STATUS_UPTODATE,
792 REF_STATUS_REMOTE_REJECT,
793 REF_STATUS_EXPECTING_REPORT,
794 } status;
795 char *remote_status;
796 struct ref *peer_ref; /* when renaming */
797 char name[FLEX_ARRAY]; /* more */
798};
799
800#define REF_NORMAL (1u << 0)
801#define REF_HEADS (1u << 1)
802#define REF_TAGS (1u << 2)
803
804extern struct ref *find_ref_by_name(struct ref *list, const char *name);
805
806#define CONNECT_VERBOSE (1u << 0)
807extern struct child_process *git_connect(int fd[2], const char *url, const char *prog, int flags);
808extern int finish_connect(struct child_process *conn);
809extern int path_match(const char *path, int nr, char **match);
810extern int get_ack(int fd, unsigned char *result_sha1);
811struct extra_have_objects {
812 int nr, alloc;
813 unsigned char (*array)[20];
814};
815extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, unsigned int flags, struct extra_have_objects *);
816extern int server_supports(const char *feature);
817
818extern struct packed_git *parse_pack_index(unsigned char *sha1);
819
820extern void prepare_packed_git(void);
821extern void reprepare_packed_git(void);
822extern void install_packed_git(struct packed_git *pack);
823
824extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
825 struct packed_git *packs);
826
827extern void pack_report(void);
828extern int open_pack_index(struct packed_git *);
829extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *);
830extern void close_pack_windows(struct packed_git *);
831extern void unuse_pack(struct pack_window **);
832extern void free_pack_by_name(const char *);
833extern struct packed_git *add_packed_git(const char *, int, int);
834extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t);
835extern off_t nth_packed_object_offset(const struct packed_git *, uint32_t);
836extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *);
837extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *);
838extern unsigned long unpack_object_header_buffer(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep);
839extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t);
840extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *);
841extern int matches_pack_name(struct packed_git *p, const char *name);
842
843/* Dumb servers support */
844extern int update_server_info(int);
845
846typedef int (*config_fn_t)(const char *, const char *, void *);
847extern int git_default_config(const char *, const char *, void *);
848extern int git_config_from_file(config_fn_t fn, const char *, void *);
849extern int git_config(config_fn_t fn, void *);
850extern int git_parse_ulong(const char *, unsigned long *);
851extern int git_config_int(const char *, const char *);
852extern unsigned long git_config_ulong(const char *, const char *);
853extern int git_config_bool_or_int(const char *, const char *, int *);
854extern int git_config_bool(const char *, const char *);
855extern int git_config_string(const char **, const char *, const char *);
856extern int git_config_set(const char *, const char *);
857extern int git_config_set_multivar(const char *, const char *, const char *, int);
858extern int git_config_rename_section(const char *, const char *);
859extern const char *git_etc_gitconfig(void);
860extern int check_repository_format_version(const char *var, const char *value, void *cb);
861extern int git_config_system(void);
862extern int git_config_global(void);
863extern int config_error_nonbool(const char *);
864extern const char *config_exclusive_filename;
865
866#define MAX_GITNAME (1000)
867extern char git_default_email[MAX_GITNAME];
868extern char git_default_name[MAX_GITNAME];
869extern int user_ident_explicitly_given;
870
871extern const char *git_commit_encoding;
872extern const char *git_log_output_encoding;
873
874/* IO helper functions */
875extern void maybe_flush_or_die(FILE *, const char *);
876extern int copy_fd(int ifd, int ofd);
877extern int copy_file(const char *dst, const char *src, int mode);
878extern ssize_t read_in_full(int fd, void *buf, size_t count);
879extern ssize_t write_in_full(int fd, const void *buf, size_t count);
880extern void write_or_die(int fd, const void *buf, size_t count);
881extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg);
882extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg);
883extern void fsync_or_die(int fd, const char *);
884
885/* pager.c */
886extern void setup_pager(void);
887extern const char *pager_program;
888extern int pager_in_use(void);
889extern int pager_use_color;
890
891extern const char *editor_program;
892extern const char *excludes_file;
893
894/* base85 */
895int decode_85(char *dst, const char *line, int linelen);
896void encode_85(char *buf, const unsigned char *data, int bytes);
897
898/* alloc.c */
899extern void *alloc_blob_node(void);
900extern void *alloc_tree_node(void);
901extern void *alloc_commit_node(void);
902extern void *alloc_tag_node(void);
903extern void *alloc_object_node(void);
904extern void alloc_report(void);
905
906/* trace.c */
907extern void trace_printf(const char *format, ...);
908extern void trace_argv_printf(const char **argv, const char *format, ...);
909
910/* convert.c */
911/* returns 1 if *dst was used */
912extern int convert_to_git(const char *path, const char *src, size_t len,
913 struct strbuf *dst, enum safe_crlf checksafe);
914extern int convert_to_working_tree(const char *path, const char *src, size_t len, struct strbuf *dst);
915
916/* add */
917/*
918 * return 0 if success, 1 - if addition of a file failed and
919 * ADD_FILES_IGNORE_ERRORS was specified in flags
920 */
921int add_files_to_cache(const char *prefix, const char **pathspec, int flags);
922
923/* diff.c */
924extern int diff_auto_refresh_index;
925
926/* match-trees.c */
927void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int);
928
929/*
930 * whitespace rules.
931 * used by both diff and apply
932 */
933#define WS_TRAILING_SPACE 01
934#define WS_SPACE_BEFORE_TAB 02
935#define WS_INDENT_WITH_NON_TAB 04
936#define WS_CR_AT_EOL 010
937#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB)
938extern unsigned whitespace_rule_cfg;
939extern unsigned whitespace_rule(const char *);
940extern unsigned parse_whitespace_rule(const char *);
941extern unsigned ws_check(const char *line, int len, unsigned ws_rule);
942extern void ws_check_emit(const char *line, int len, unsigned ws_rule, FILE *stream, const char *set, const char *reset, const char *ws);
943extern char *whitespace_error_string(unsigned ws);
944extern int ws_fix_copy(char *, const char *, int, unsigned, int *);
945extern int ws_blank_line(const char *line, int len, unsigned ws_rule);
946
947/* ls-files */
948int report_path_error(const char *ps_matched, const char **pathspec, int prefix_offset);
949void overlay_tree_on_cache(const char *tree_name, const char *prefix);
950
951char *alias_lookup(const char *alias);
952int split_cmdline(char *cmdline, const char ***argv);
953
954#endif /* CACHE_H */
Unnamed repository; edit this file 'description' to name the repository.