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e83c5163 LT |
1 | #ifndef CACHE_H |
2 | #define CACHE_H | |
3 | ||
2dee0609 | 4 | #include <unistd.h> |
e83c5163 LT |
5 | #include <stdio.h> |
6 | #include <sys/stat.h> | |
7 | #include <fcntl.h> | |
8 | #include <stddef.h> | |
9 | #include <stdlib.h> | |
10 | #include <stdarg.h> | |
bf0c6e83 | 11 | #include <string.h> |
e83c5163 | 12 | #include <errno.h> |
6b0c3121 | 13 | #include <limits.h> |
e83c5163 | 14 | #include <sys/mman.h> |
bb233d69 | 15 | #include <sys/param.h> |
ccc4feb5 | 16 | #include <netinet/in.h> |
e83c5163 | 17 | |
cef661fc | 18 | #include SHA1_HEADER |
e83c5163 LT |
19 | #include <zlib.h> |
20 | ||
9da3acfb ET |
21 | #if ZLIB_VERNUM < 0x1200 |
22 | #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11) | |
23 | #endif | |
24 | ||
b6829693 ET |
25 | #ifdef DT_UNKNOWN |
26 | #define DTYPE(de) ((de)->d_type) | |
27 | #else | |
28 | #define DT_UNKNOWN 0 | |
29 | #define DT_DIR 1 | |
30 | #define DT_REG 2 | |
a15c1c60 | 31 | #define DT_LNK 3 |
b6829693 ET |
32 | #define DTYPE(de) DT_UNKNOWN |
33 | #endif | |
34 | ||
d19938ab JH |
35 | /* |
36 | * Environment variables transition. | |
37 | * We accept older names for now but warn. | |
38 | */ | |
39 | extern char *gitenv_bc(const char *); | |
40 | #define gitenv(e) (getenv(e) ? : gitenv_bc(e)) | |
41 | ||
e83c5163 LT |
42 | /* |
43 | * Basic data structures for the directory cache | |
e83c5163 LT |
44 | */ |
45 | ||
46 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
47 | struct cache_header { | |
ccc4feb5 LT |
48 | unsigned int hdr_signature; |
49 | unsigned int hdr_version; | |
50 | unsigned int hdr_entries; | |
e83c5163 LT |
51 | }; |
52 | ||
53 | /* | |
54 | * The "cache_time" is just the low 32 bits of the | |
55 | * time. It doesn't matter if it overflows - we only | |
56 | * check it for equality in the 32 bits we save. | |
57 | */ | |
58 | struct cache_time { | |
59 | unsigned int sec; | |
60 | unsigned int nsec; | |
61 | }; | |
62 | ||
63 | /* | |
64 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
65 | * Again - this is just a (very strong in practice) heuristic that | |
66 | * the inode hasn't changed. | |
ccc4feb5 LT |
67 | * |
68 | * We save the fields in big-endian order to allow using the | |
69 | * index file over NFS transparently. | |
e83c5163 LT |
70 | */ |
71 | struct cache_entry { | |
ccc4feb5 LT |
72 | struct cache_time ce_ctime; |
73 | struct cache_time ce_mtime; | |
74 | unsigned int ce_dev; | |
75 | unsigned int ce_ino; | |
76 | unsigned int ce_mode; | |
77 | unsigned int ce_uid; | |
78 | unsigned int ce_gid; | |
79 | unsigned int ce_size; | |
e83c5163 | 80 | unsigned char sha1[20]; |
f5cabd13 | 81 | unsigned short ce_flags; |
59c1e249 | 82 | char name[0]; |
e83c5163 LT |
83 | }; |
84 | ||
95fd5bf8 LT |
85 | #define CE_NAMEMASK (0x0fff) |
86 | #define CE_STAGEMASK (0x3000) | |
aee46198 | 87 | #define CE_STAGESHIFT 12 |
95fd5bf8 | 88 | |
aee46198 JH |
89 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) |
90 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
91 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
92 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
93 | ||
e4479470 | 94 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) |
8ae0a8c5 KS |
95 | static inline unsigned int create_ce_mode(unsigned int mode) |
96 | { | |
8ae0a8c5 KS |
97 | if (S_ISLNK(mode)) |
98 | return htonl(S_IFLNK); | |
db823d4a | 99 | return htonl(S_IFREG | ce_permissions(mode)); |
8ae0a8c5 | 100 | } |
e4479470 | 101 | |
aee46198 | 102 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) |
f5cabd13 | 103 | |
88355048 PB |
104 | extern struct cache_entry **active_cache; |
105 | extern unsigned int active_nr, active_alloc, active_cache_changed; | |
e83c5163 | 106 | |
8ac069ac JH |
107 | #define GIT_DIR_ENVIRONMENT "GIT_DIR" |
108 | #define DEFAULT_GIT_DIR_ENVIRONMENT ".git" | |
d19938ab | 109 | #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY" |
bb233d69 | 110 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" |
bb233d69 | 111 | |
8ac069ac JH |
112 | extern char *get_object_directory(void); |
113 | extern char *get_index_file(void); | |
114 | ||
115 | #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" | |
bb233d69 | 116 | |
e83c5163 LT |
117 | #define alloc_nr(x) (((x)+16)*3/2) |
118 | ||
734aab75 | 119 | /* Initialize and use the cache information */ |
e83c5163 | 120 | extern int read_cache(void); |
197ee8c9 | 121 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); |
eb38c22f | 122 | extern int cache_name_pos(const char *name, int namelen); |
192268c1 JH |
123 | #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */ |
124 | #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */ | |
125 | extern int add_cache_entry(struct cache_entry *ce, int option); | |
dbbce55b | 126 | extern int remove_cache_entry_at(int pos); |
197ee8c9 | 127 | extern int remove_file_from_cache(char *path); |
dbbce55b | 128 | extern int ce_same_name(struct cache_entry *a, struct cache_entry *b); |
5d728c84 | 129 | extern int ce_match_stat(struct cache_entry *ce, struct stat *st); |
74400e71 | 130 | extern int index_fd(unsigned char *sha1, int fd, struct stat *st); |
415e96c8 JH |
131 | extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st); |
132 | ||
133 | struct cache_file { | |
134 | struct cache_file *next; | |
135 | char lockfile[PATH_MAX]; | |
136 | }; | |
137 | extern int hold_index_file_for_update(struct cache_file *, const char *path); | |
138 | extern int commit_index_file(struct cache_file *); | |
139 | extern void rollback_index_file(struct cache_file *); | |
734aab75 LT |
140 | |
141 | #define MTIME_CHANGED 0x0001 | |
142 | #define CTIME_CHANGED 0x0002 | |
143 | #define OWNER_CHANGED 0x0004 | |
144 | #define MODE_CHANGED 0x0008 | |
145 | #define INODE_CHANGED 0x0010 | |
146 | #define DATA_CHANGED 0x0020 | |
8ae0a8c5 | 147 | #define TYPE_CHANGED 0x0040 |
e83c5163 LT |
148 | |
149 | /* Return a statically allocated filename matching the sha1 signature */ | |
73134b6d | 150 | extern char *sha1_file_name(const unsigned char *sha1); |
e83c5163 | 151 | |
e83c5163 | 152 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ |
73134b6d | 153 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
2ade9340 | 154 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); |
73134b6d | 155 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); |
bf0f910d | 156 | extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1); |
8237b185 | 157 | |
d98b46f8 | 158 | extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size, const char *type); |
e83c5163 | 159 | |
94537c78 LT |
160 | /* Read a tree into the cache */ |
161 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
162 | ||
8237b185 DB |
163 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
164 | ||
165 | extern int has_sha1_file(const unsigned char *sha1); | |
166 | ||
e83c5163 | 167 | /* Convert to/from hex/sha1 representation */ |
3c249c95 | 168 | extern int get_sha1(const char *str, unsigned char *sha1); |
197ee8c9 LT |
169 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); |
170 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
e83c5163 LT |
171 | |
172 | /* General helper functions */ | |
2de381f9 PB |
173 | extern void usage(const char *err); |
174 | extern void die(const char *err, ...); | |
175 | extern int error(const char *err, ...); | |
176 | ||
958ba6c9 | 177 | extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2); |
79517a06 | 178 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); |
e83c5163 | 179 | |
40469ee9 | 180 | extern void *read_object_with_reference(const unsigned char *sha1, |
bf0f910d | 181 | const char *required_type, |
40469ee9 JH |
182 | unsigned long *size, |
183 | unsigned char *sha1_ret); | |
f4913f91 | 184 | |
f80cd783 | 185 | const char *show_date(unsigned long time, int timezone); |
ecee9d9e ET |
186 | void parse_date(char *date, char *buf, int bufsize); |
187 | void datestamp(char *buf, int bufsize); | |
188 | ||
127cfd0d | 189 | static inline void *xmalloc(size_t size) |
812666c8 CL |
190 | { |
191 | void *ret = malloc(size); | |
192 | if (!ret) | |
193 | die("Out of memory, malloc failed"); | |
194 | return ret; | |
195 | } | |
196 | ||
127cfd0d | 197 | static inline void *xrealloc(void *ptr, size_t size) |
812666c8 CL |
198 | { |
199 | void *ret = realloc(ptr, size); | |
200 | if (!ret) | |
201 | die("Out of memory, realloc failed"); | |
202 | return ret; | |
203 | } | |
204 | ||
127cfd0d BR |
205 | static inline void *xcalloc(size_t nmemb, size_t size) |
206 | { | |
207 | void *ret = calloc(nmemb, size); | |
208 | if (!ret) | |
209 | die("Out of memory, calloc failed"); | |
210 | return ret; | |
211 | } | |
212 | ||
e83c5163 | 213 | #endif /* CACHE_H */ |