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1 | #ifndef CACHE_H | |
2 | #define CACHE_H | |
3 | ||
4 | #include <unistd.h> | |
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> | |
11 | #include <string.h> | |
12 | #include <errno.h> | |
13 | #include <limits.h> | |
14 | #include <sys/mman.h> | |
15 | #include <sys/param.h> | |
16 | #include <netinet/in.h> | |
17 | #include <sys/types.h> | |
18 | #include <dirent.h> | |
19 | ||
20 | #include SHA1_HEADER | |
21 | #include <zlib.h> | |
22 | ||
23 | #if ZLIB_VERNUM < 0x1200 | |
24 | #define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11) | |
25 | #endif | |
26 | ||
27 | #ifdef DT_UNKNOWN | |
28 | #define DTYPE(de) ((de)->d_type) | |
29 | #else | |
30 | #define DT_UNKNOWN 0 | |
31 | #define DT_DIR 1 | |
32 | #define DT_REG 2 | |
33 | #define DT_LNK 3 | |
34 | #define DTYPE(de) DT_UNKNOWN | |
35 | #endif | |
36 | ||
37 | #ifdef __GNUC__ | |
38 | #define NORETURN __attribute__((__noreturn__)) | |
39 | #else | |
40 | #define NORETURN | |
41 | #endif | |
42 | ||
43 | /* | |
44 | * Environment variables transition. | |
45 | * We accept older names for now but warn. | |
46 | */ | |
47 | extern char *gitenv_bc(const char *); | |
48 | #define gitenv(e) (getenv(e) ? : gitenv_bc(e)) | |
49 | ||
50 | /* | |
51 | * Basic data structures for the directory cache | |
52 | */ | |
53 | ||
54 | #define CACHE_SIGNATURE 0x44495243 /* "DIRC" */ | |
55 | struct cache_header { | |
56 | unsigned int hdr_signature; | |
57 | unsigned int hdr_version; | |
58 | unsigned int hdr_entries; | |
59 | }; | |
60 | ||
61 | /* | |
62 | * The "cache_time" is just the low 32 bits of the | |
63 | * time. It doesn't matter if it overflows - we only | |
64 | * check it for equality in the 32 bits we save. | |
65 | */ | |
66 | struct cache_time { | |
67 | unsigned int sec; | |
68 | unsigned int nsec; | |
69 | }; | |
70 | ||
71 | /* | |
72 | * dev/ino/uid/gid/size are also just tracked to the low 32 bits | |
73 | * Again - this is just a (very strong in practice) heuristic that | |
74 | * the inode hasn't changed. | |
75 | * | |
76 | * We save the fields in big-endian order to allow using the | |
77 | * index file over NFS transparently. | |
78 | */ | |
79 | struct cache_entry { | |
80 | struct cache_time ce_ctime; | |
81 | struct cache_time ce_mtime; | |
82 | unsigned int ce_dev; | |
83 | unsigned int ce_ino; | |
84 | unsigned int ce_mode; | |
85 | unsigned int ce_uid; | |
86 | unsigned int ce_gid; | |
87 | unsigned int ce_size; | |
88 | unsigned char sha1[20]; | |
89 | unsigned short ce_flags; | |
90 | char name[0]; | |
91 | }; | |
92 | ||
93 | #define CE_NAMEMASK (0x0fff) | |
94 | #define CE_STAGEMASK (0x3000) | |
95 | #define CE_UPDATE (0x4000) | |
96 | #define CE_STAGESHIFT 12 | |
97 | ||
98 | #define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT)) | |
99 | #define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags)) | |
100 | #define ce_size(ce) cache_entry_size(ce_namelen(ce)) | |
101 | #define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT) | |
102 | ||
103 | #define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644) | |
104 | static inline unsigned int create_ce_mode(unsigned int mode) | |
105 | { | |
106 | if (S_ISLNK(mode)) | |
107 | return htonl(S_IFLNK); | |
108 | return htonl(S_IFREG | ce_permissions(mode)); | |
109 | } | |
110 | ||
111 | #define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) | |
112 | ||
113 | extern struct cache_entry **active_cache; | |
114 | extern unsigned int active_nr, active_alloc, active_cache_changed; | |
115 | ||
116 | #define GIT_DIR_ENVIRONMENT "GIT_DIR" | |
117 | #define DEFAULT_GIT_DIR_ENVIRONMENT ".git" | |
118 | #define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY" | |
119 | #define INDEX_ENVIRONMENT "GIT_INDEX_FILE" | |
120 | ||
121 | extern char *get_object_directory(void); | |
122 | extern char *get_refs_directory(void); | |
123 | extern char *get_index_file(void); | |
124 | ||
125 | #define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" | |
126 | ||
127 | #define alloc_nr(x) (((x)+16)*3/2) | |
128 | ||
129 | /* Initialize and use the cache information */ | |
130 | extern int read_cache(void); | |
131 | extern int write_cache(int newfd, struct cache_entry **cache, int entries); | |
132 | extern int cache_name_pos(const char *name, int namelen); | |
133 | #define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */ | |
134 | #define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */ | |
135 | #define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */ | |
136 | extern int add_cache_entry(struct cache_entry *ce, int option); | |
137 | extern int remove_cache_entry_at(int pos); | |
138 | extern int remove_file_from_cache(char *path); | |
139 | extern int ce_same_name(struct cache_entry *a, struct cache_entry *b); | |
140 | extern int ce_match_stat(struct cache_entry *ce, struct stat *st); | |
141 | extern int index_fd(unsigned char *sha1, int fd, struct stat *st); | |
142 | extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st); | |
143 | ||
144 | struct cache_file { | |
145 | struct cache_file *next; | |
146 | char lockfile[PATH_MAX]; | |
147 | }; | |
148 | extern int hold_index_file_for_update(struct cache_file *, const char *path); | |
149 | extern int commit_index_file(struct cache_file *); | |
150 | extern void rollback_index_file(struct cache_file *); | |
151 | ||
152 | #define MTIME_CHANGED 0x0001 | |
153 | #define CTIME_CHANGED 0x0002 | |
154 | #define OWNER_CHANGED 0x0004 | |
155 | #define MODE_CHANGED 0x0008 | |
156 | #define INODE_CHANGED 0x0010 | |
157 | #define DATA_CHANGED 0x0020 | |
158 | #define TYPE_CHANGED 0x0040 | |
159 | ||
160 | /* Return a statically allocated filename matching the sha1 signature */ | |
161 | extern char *sha1_file_name(const unsigned char *sha1); | |
162 | ||
163 | /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ | |
164 | extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); | |
165 | extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size); | |
166 | extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep); | |
167 | extern int sha1_object_info(const unsigned char *, char *, unsigned long *); | |
168 | extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); | |
169 | extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); | |
170 | extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1); | |
171 | ||
172 | extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type); | |
173 | ||
174 | /* Read a tree into the cache */ | |
175 | extern int read_tree(void *buffer, unsigned long size, int stage); | |
176 | ||
177 | extern int write_sha1_from_fd(const unsigned char *sha1, int fd); | |
178 | ||
179 | extern int has_sha1_file(const unsigned char *sha1); | |
180 | ||
181 | /* Convert to/from hex/sha1 representation */ | |
182 | extern int get_sha1(const char *str, unsigned char *sha1); | |
183 | extern int get_sha1_hex(const char *hex, unsigned char *sha1); | |
184 | extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */ | |
185 | ||
186 | /* General helper functions */ | |
187 | extern void usage(const char *err) NORETURN; | |
188 | extern void die(const char *err, ...) NORETURN; | |
189 | extern int error(const char *err, ...); | |
190 | ||
191 | extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2); | |
192 | extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2); | |
193 | ||
194 | extern void *read_object_with_reference(const unsigned char *sha1, | |
195 | const char *required_type, | |
196 | unsigned long *size, | |
197 | unsigned char *sha1_ret); | |
198 | ||
199 | const char *show_date(unsigned long time, int timezone); | |
200 | void parse_date(char *date, char *buf, int bufsize); | |
201 | void datestamp(char *buf, int bufsize); | |
202 | ||
203 | static inline void *xmalloc(size_t size) | |
204 | { | |
205 | void *ret = malloc(size); | |
206 | if (!ret) | |
207 | die("Out of memory, malloc failed"); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | static inline void *xrealloc(void *ptr, size_t size) | |
212 | { | |
213 | void *ret = realloc(ptr, size); | |
214 | if (!ret) | |
215 | die("Out of memory, realloc failed"); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | static inline void *xcalloc(size_t nmemb, size_t size) | |
220 | { | |
221 | void *ret = calloc(nmemb, size); | |
222 | if (!ret) | |
223 | die("Out of memory, calloc failed"); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | struct checkout { | |
228 | const char *base_dir; | |
229 | int base_dir_len; | |
230 | unsigned force:1, | |
231 | quiet:1, | |
232 | not_new:1, | |
233 | refresh_cache:1; | |
234 | }; | |
235 | ||
236 | extern int checkout_entry(struct cache_entry *ce, struct checkout *state); | |
237 | ||
238 | extern struct alternate_object_database { | |
239 | char *base; | |
240 | char *name; | |
241 | } *alt_odb; | |
242 | extern void prepare_alt_odb(void); | |
243 | ||
244 | extern struct packed_git { | |
245 | struct packed_git *next; | |
246 | unsigned long index_size; | |
247 | unsigned long pack_size; | |
248 | unsigned int *index_base; | |
249 | void *pack_base; | |
250 | unsigned int pack_last_used; | |
251 | unsigned int pack_use_cnt; | |
252 | char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */ | |
253 | } *packed_git; | |
254 | extern void prepare_packed_git(void); | |
255 | extern int use_packed_git(struct packed_git *); | |
256 | extern void unuse_packed_git(struct packed_git *); | |
257 | extern struct packed_git *add_packed_git(char *, int); | |
258 | extern int num_packed_objects(const struct packed_git *p); | |
259 | extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*); | |
260 | ||
261 | #endif /* CACHE_H */ |