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Fix ref_newer() in send-pack.
[thirdparty/git.git] / cache.h
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CommitLineData
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 * Intensive research over the course of many years has shown that
45 * port 9418 is totally unused by anything else. Or
46 *
47 * Your search - "port 9418" - did not match any documents.
48 *
49 * as www.google.com puts it.
50 */
51#define DEFAULT_GIT_PORT 9418
52
53/*
54 * Environment variables transition.
55 * We accept older names for now but warn.
56 */
57extern char *gitenv_bc(const char *);
58#define gitenv(e) (getenv(e) ? : gitenv_bc(e))
59
60/*
61 * Basic data structures for the directory cache
62 */
63
64#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
65struct cache_header {
66 unsigned int hdr_signature;
67 unsigned int hdr_version;
68 unsigned int hdr_entries;
69};
70
71/*
72 * The "cache_time" is just the low 32 bits of the
73 * time. It doesn't matter if it overflows - we only
74 * check it for equality in the 32 bits we save.
75 */
76struct cache_time {
77 unsigned int sec;
78 unsigned int nsec;
79};
80
81/*
82 * dev/ino/uid/gid/size are also just tracked to the low 32 bits
83 * Again - this is just a (very strong in practice) heuristic that
84 * the inode hasn't changed.
85 *
86 * We save the fields in big-endian order to allow using the
87 * index file over NFS transparently.
88 */
89struct cache_entry {
90 struct cache_time ce_ctime;
91 struct cache_time ce_mtime;
92 unsigned int ce_dev;
93 unsigned int ce_ino;
94 unsigned int ce_mode;
95 unsigned int ce_uid;
96 unsigned int ce_gid;
97 unsigned int ce_size;
98 unsigned char sha1[20];
99 unsigned short ce_flags;
100 char name[0];
101};
102
103#define CE_NAMEMASK (0x0fff)
104#define CE_STAGEMASK (0x3000)
105#define CE_UPDATE (0x4000)
106#define CE_STAGESHIFT 12
107
108#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
109#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
110#define ce_size(ce) cache_entry_size(ce_namelen(ce))
111#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
112
113#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
114static inline unsigned int create_ce_mode(unsigned int mode)
115{
116 if (S_ISLNK(mode))
117 return htonl(S_IFLNK);
118 return htonl(S_IFREG | ce_permissions(mode));
119}
120
121#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
122
123extern struct cache_entry **active_cache;
124extern unsigned int active_nr, active_alloc, active_cache_changed;
125
126#define GIT_DIR_ENVIRONMENT "GIT_DIR"
127#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
128#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
129#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
130#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
131#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIRECTORY"
132#ifndef DEFAULT_GIT_TEMPLATE_ENVIRONMENT
133#define DEFAULT_GIT_TEMPLATE_ENVIRONMENT "/etc/git-core/templates"
134#endif
135
136extern char *get_object_directory(void);
137extern char *get_refs_directory(void);
138extern char *get_index_file(void);
139extern char *get_graft_file(void);
140
141#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
142
143#define alloc_nr(x) (((x)+16)*3/2)
144
145/* Initialize and use the cache information */
146extern int read_cache(void);
147extern int write_cache(int newfd, struct cache_entry **cache, int entries);
148extern int cache_name_pos(const char *name, int namelen);
149#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
150#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
151#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
152extern int add_cache_entry(struct cache_entry *ce, int option);
153extern int remove_cache_entry_at(int pos);
154extern int remove_file_from_cache(char *path);
155extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
156extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
157extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
158extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
159extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
160
161struct cache_file {
162 struct cache_file *next;
163 char lockfile[PATH_MAX];
164};
165extern int hold_index_file_for_update(struct cache_file *, const char *path);
166extern int commit_index_file(struct cache_file *);
167extern void rollback_index_file(struct cache_file *);
168
169#define MTIME_CHANGED 0x0001
170#define CTIME_CHANGED 0x0002
171#define OWNER_CHANGED 0x0004
172#define MODE_CHANGED 0x0008
173#define INODE_CHANGED 0x0010
174#define DATA_CHANGED 0x0020
175#define TYPE_CHANGED 0x0040
176
177/* Return a statically allocated filename matching the sha1 signature */
178extern char *mkpath(const char *fmt, ...);
179extern char *git_path(const char *fmt, ...);
180extern char *sha1_file_name(const unsigned char *sha1);
181extern char *sha1_pack_name(const unsigned char *sha1);
182extern char *sha1_pack_index_name(const unsigned char *sha1);
183
184int safe_create_leading_directories(char *path);
185
186/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
187extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
188extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
189extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
190extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
191extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
192extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
193extern char *write_sha1_file_prepare(void *buf,
194 unsigned long len,
195 const char *type,
196 unsigned char *sha1,
197 unsigned char *hdr,
198 int *hdrlen);
199
200extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
201
202/* Read a tree into the cache */
203extern int read_tree(void *buffer, unsigned long size, int stage, const char **paths);
204
205extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
206 size_t bufsize, size_t *bufposn);
207extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
208
209extern int has_sha1_pack(const unsigned char *sha1);
210extern int has_sha1_file(const unsigned char *sha1);
211
212extern int has_pack_file(const unsigned char *sha1);
213extern int has_pack_index(const unsigned char *sha1);
214
215/* Convert to/from hex/sha1 representation */
216extern int get_sha1(const char *str, unsigned char *sha1);
217extern int get_sha1_hex(const char *hex, unsigned char *sha1);
218extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
219
220/* General helper functions */
221extern void usage(const char *err) NORETURN;
222extern void die(const char *err, ...) NORETURN;
223extern int error(const char *err, ...);
224
225extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
226extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
227
228extern void *read_object_with_reference(const unsigned char *sha1,
229 const char *required_type,
230 unsigned long *size,
231 unsigned char *sha1_ret);
232
233const char *show_date(unsigned long time, int timezone);
234void parse_date(const char *date, char *buf, int bufsize);
235void datestamp(char *buf, int bufsize);
236
237extern int setup_ident(void);
238extern char *get_ident(const char *name, const char *email, const char *date_str);
239extern char *git_author_info(void);
240extern char *git_committer_info(void);
241
242static inline void *xmalloc(size_t size)
243{
244 void *ret = malloc(size);
245 if (!ret)
246 die("Out of memory, malloc failed");
247 return ret;
248}
249
250static inline void *xrealloc(void *ptr, size_t size)
251{
252 void *ret = realloc(ptr, size);
253 if (!ret)
254 die("Out of memory, realloc failed");
255 return ret;
256}
257
258static inline void *xcalloc(size_t nmemb, size_t size)
259{
260 void *ret = calloc(nmemb, size);
261 if (!ret)
262 die("Out of memory, calloc failed");
263 return ret;
264}
265
266struct checkout {
267 const char *base_dir;
268 int base_dir_len;
269 unsigned force:1,
270 quiet:1,
271 not_new:1,
272 refresh_cache:1;
273};
274
275extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
276
277extern struct alternate_object_database {
278 char *base;
279 char *name;
280} *alt_odb;
281extern void prepare_alt_odb(void);
282
283extern struct packed_git {
284 struct packed_git *next;
285 unsigned long index_size;
286 unsigned long pack_size;
287 unsigned int *index_base;
288 void *pack_base;
289 unsigned int pack_last_used;
290 unsigned int pack_use_cnt;
291 unsigned char sha1[20];
292 char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
293} *packed_git;
294
295struct pack_entry {
296 unsigned int offset;
297 unsigned char sha1[20];
298 struct packed_git *p;
299};
300
301struct ref {
302 struct ref *next;
303 unsigned char old_sha1[20];
304 unsigned char new_sha1[20];
305 struct ref *peer_ref; /* when renaming */
306 char name[0];
307};
308
309extern int git_connect(int fd[2], char *url, const char *prog);
310extern int finish_connect(pid_t pid);
311extern int path_match(const char *path, int nr, char **match);
312extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
313 int nr_refspec, char **refspec, int all);
314extern int get_ack(int fd, unsigned char *result_sha1);
315extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match);
316
317extern struct packed_git *parse_pack_index(unsigned char *sha1);
318
319extern void prepare_packed_git(void);
320extern void install_packed_git(struct packed_git *pack);
321
322extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
323 struct packed_git *packs);
324
325extern int use_packed_git(struct packed_git *);
326extern void unuse_packed_git(struct packed_git *);
327extern struct packed_git *add_packed_git(char *, int);
328extern int num_packed_objects(const struct packed_git *p);
329extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
330extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
331extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
332extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);
333
334/* Dumb servers support */
335extern int update_server_info(int);
336
337#endif /* CACHE_H */
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