1#ifndef CACHE_H
2#define CACHE_H
3
4#include "git-compat-util.h"
5
6#include SHA1_HEADER
7#include <zlib.h>
8
9#if ZLIB_VERNUM < 0x1200
10#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
11#endif
12
13#ifdef DT_UNKNOWN
14#define DTYPE(de) ((de)->d_type)
15#else
16#define DT_UNKNOWN 0
17#define DT_DIR 1
18#define DT_REG 2
19#define DT_LNK 3
20#define DTYPE(de) DT_UNKNOWN
21#endif
22
23/*
24 * Intensive research over the course of many years has shown that
25 * port 9418 is totally unused by anything else. Or
26 *
27 * Your search - "port 9418" - did not match any documents.
28 *
29 * as www.google.com puts it.
30 *
31 * This port has been properly assigned for git use by IANA:
32 * git (Assigned-9418) [I06-050728-0001].
33 *
34 * git 9418/tcp git pack transfer service
35 * git 9418/udp git pack transfer service
36 *
37 * with Linus Torvalds <torvalds@osdl.org> as the point of
38 * contact. September 2005.
39 *
40 * See http://www.iana.org/assignments/port-numbers
41 */
42#define DEFAULT_GIT_PORT 9418
43
44/*
45 * Basic data structures for the directory cache
46 */
47
48#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
49struct cache_header {
50 unsigned int hdr_signature;
51 unsigned int hdr_version;
52 unsigned int hdr_entries;
53};
54
55/*
56 * The "cache_time" is just the low 32 bits of the
57 * time. It doesn't matter if it overflows - we only
58 * check it for equality in the 32 bits we save.
59 */
60struct cache_time {
61 unsigned int sec;
62 unsigned int nsec;
63};
64
65/*
66 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
67 * Again - this is just a (very strong in practice) heuristic that
68 * the inode hasn't changed.
69 *
70 * We save the fields in big-endian order to allow using the
71 * index file over NFS transparently.
72 */
73struct cache_entry {
74 struct cache_time ce_ctime;
75 struct cache_time ce_mtime;
76 unsigned int ce_dev;
77 unsigned int ce_ino;
78 unsigned int ce_mode;
79 unsigned int ce_uid;
80 unsigned int ce_gid;
81 unsigned int ce_size;
82 unsigned char sha1[20];
83 unsigned short ce_flags;
84 char name[0];
85};
86
87#define CE_NAMEMASK (0x0fff)
88#define CE_STAGEMASK (0x3000)
89#define CE_UPDATE (0x4000)
90#define CE_STAGESHIFT 12
91
92#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
93#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
94#define ce_size(ce) cache_entry_size(ce_namelen(ce))
95#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
96
97#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
98static inline unsigned int create_ce_mode(unsigned int mode)
99{
100 if (S_ISLNK(mode))
101 return htonl(S_IFLNK);
102 return htonl(S_IFREG | ce_permissions(mode));
103}
104
105#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
106
107extern struct cache_entry **active_cache;
108extern unsigned int active_nr, active_alloc, active_cache_changed;
109
110#define GIT_DIR_ENVIRONMENT "GIT_DIR"
111#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
112#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
113#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
114#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
115
116extern char *get_git_dir(void);
117extern char *get_object_directory(void);
118extern char *get_refs_directory(void);
119extern char *get_index_file(void);
120extern char *get_graft_file(void);
121
122#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
123
124extern const char **get_pathspec(const char *prefix, const char **pathspec);
125extern const char *setup_git_directory_gently(int *);
126extern const char *setup_git_directory(void);
127extern const char *prefix_path(const char *prefix, int len, const char *path);
128extern const char *prefix_filename(const char *prefix, int len, const char *path);
129
130#define alloc_nr(x) (((x)+16)*3/2)
131
132/* Initialize and use the cache information */
133extern int read_cache(void);
134extern int write_cache(int newfd, struct cache_entry **cache, int entries);
135extern int cache_name_pos(const char *name, int namelen);
136#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
137#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
138#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
139extern int add_cache_entry(struct cache_entry *ce, int option);
140extern int remove_cache_entry_at(int pos);
141extern int remove_file_from_cache(const char *path);
142extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
143extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
144extern int ce_modified(struct cache_entry *ce, struct stat *st);
145extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
146extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
147extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object);
148extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
149extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
150
151struct cache_file {
152 struct cache_file *next;
153 char lockfile[PATH_MAX];
154};
155extern int hold_index_file_for_update(struct cache_file *, const char *path);
156extern int commit_index_file(struct cache_file *);
157extern void rollback_index_file(struct cache_file *);
158
159extern int trust_executable_bit;
160extern int only_use_symrefs;
161extern int diff_rename_limit_default;
162extern int shared_repository;
163
164#define GIT_REPO_VERSION 0
165extern int repository_format_version;
166extern int check_repository_format(void);
167
168#define MTIME_CHANGED 0x0001
169#define CTIME_CHANGED 0x0002
170#define OWNER_CHANGED 0x0004
171#define MODE_CHANGED 0x0008
172#define INODE_CHANGED 0x0010
173#define DATA_CHANGED 0x0020
174#define TYPE_CHANGED 0x0040
175
176/* Return a statically allocated filename matching the sha1 signature */
177extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
178extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
179extern char *sha1_file_name(const unsigned char *sha1);
180extern char *sha1_pack_name(const unsigned char *sha1);
181extern char *sha1_pack_index_name(const unsigned char *sha1);
182extern const char *find_unique_abbrev(const unsigned char *sha1, int);
183extern const unsigned char null_sha1[20];
184
185int git_mkstemp(char *path, size_t n, const char *template);
186
187int adjust_shared_perm(const char *path);
188int safe_create_leading_directories(char *path);
189char *safe_strncpy(char *, const char *, size_t);
190char *enter_repo(char *path, int strict);
191
192/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
193extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
194extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
195extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
196extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
197extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
198extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
199extern char *write_sha1_file_prepare(void *buf,
200 unsigned long len,
201 const char *type,
202 unsigned char *sha1,
203 unsigned char *hdr,
204 int *hdrlen);
205
206extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
207
208/* Read a tree into the cache */
209extern int read_tree(void *buffer, unsigned long size, int stage, const char **paths);
210
211extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
212 size_t bufsize, size_t *bufposn);
213extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
214extern int move_temp_to_file(const char *tmpfile, char *filename);
215
216extern int has_sha1_pack(const unsigned char *sha1);
217extern int has_sha1_file(const unsigned char *sha1);
218
219extern int has_pack_file(const unsigned char *sha1);
220extern int has_pack_index(const unsigned char *sha1);
221
222/* Convert to/from hex/sha1 representation */
223extern int get_sha1(const char *str, unsigned char *sha1);
224extern int get_sha1_hex(const char *hex, unsigned char *sha1);
225extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
226extern int read_ref(const char *filename, unsigned char *sha1);
227extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
228extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
229extern int validate_symref(const char *git_HEAD);
230
231extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
232extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
233
234extern void *read_object_with_reference(const unsigned char *sha1,
235 const char *required_type,
236 unsigned long *size,
237 unsigned char *sha1_ret);
238
239const char *show_date(unsigned long time, int timezone);
240int parse_date(const char *date, char *buf, int bufsize);
241void datestamp(char *buf, int bufsize);
242unsigned long approxidate(const char *);
243
244extern int setup_ident(void);
245extern const char *git_author_info(void);
246extern const char *git_committer_info(void);
247
248struct checkout {
249 const char *base_dir;
250 int base_dir_len;
251 unsigned force:1,
252 quiet:1,
253 not_new:1,
254 refresh_cache:1;
255};
256
257extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
258
259extern struct alternate_object_database {
260 struct alternate_object_database *next;
261 char *name;
262 char base[0]; /* more */
263} *alt_odb_list;
264extern void prepare_alt_odb(void);
265
266extern struct packed_git {
267 struct packed_git *next;
268 unsigned long index_size;
269 unsigned long pack_size;
270 unsigned int *index_base;
271 void *pack_base;
272 unsigned int pack_last_used;
273 unsigned int pack_use_cnt;
274 int pack_local;
275 unsigned char sha1[20];
276 char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
277} *packed_git;
278
279struct pack_entry {
280 unsigned int offset;
281 unsigned char sha1[20];
282 struct packed_git *p;
283};
284
285struct ref {
286 struct ref *next;
287 unsigned char old_sha1[20];
288 unsigned char new_sha1[20];
289 unsigned char force;
290 struct ref *peer_ref; /* when renaming */
291 char name[0];
292};
293
294extern int git_connect(int fd[2], char *url, const char *prog);
295extern int finish_connect(pid_t pid);
296extern int path_match(const char *path, int nr, char **match);
297extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
298 int nr_refspec, char **refspec, int all);
299extern int get_ack(int fd, unsigned char *result_sha1);
300extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, int ignore_funny);
301extern int server_supports(const char *feature);
302
303extern struct packed_git *parse_pack_index(unsigned char *sha1);
304extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
305 char *idx_path);
306
307extern void prepare_packed_git(void);
308extern void install_packed_git(struct packed_git *pack);
309
310extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
311 struct packed_git *packs);
312
313extern int use_packed_git(struct packed_git *);
314extern void unuse_packed_git(struct packed_git *);
315extern struct packed_git *add_packed_git(char *, int, int);
316extern int num_packed_objects(const struct packed_git *p);
317extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
318extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
319extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
320extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);
321
322/* Dumb servers support */
323extern int update_server_info(int);
324
325typedef int (*config_fn_t)(const char *, const char *);
326extern int git_default_config(const char *, const char *);
327extern int git_config_from_file(config_fn_t fn, const char *);
328extern int git_config(config_fn_t fn);
329extern int git_config_int(const char *, const char *);
330extern int git_config_bool(const char *, const char *);
331extern int git_config_set(const char *, const char *);
332extern int git_config_set_multivar(const char *, const char *, const char *, int);
333extern int check_repository_format_version(const char *var, const char *value);
334
335#define MAX_GITNAME (1000)
336extern char git_default_email[MAX_GITNAME];
337extern char git_default_name[MAX_GITNAME];
338
339#define MAX_ENCODING_LENGTH 64
340extern char git_commit_encoding[MAX_ENCODING_LENGTH];
341
342extern int copy_fd(int ifd, int ofd);
343
344/* Finish off pack transfer receiving end */
345extern int receive_unpack_pack(int fd[2], const char *me, int quiet);
346extern int receive_keep_pack(int fd[2], const char *me);
347
348#endif /* CACHE_H */