зеркало из https://github.com/microsoft/git.git
354 строки
11 KiB
C
354 строки
11 KiB
C
#ifndef CACHE_H
|
|
#define CACHE_H
|
|
|
|
#include <unistd.h>
|
|
#include <stdio.h>
|
|
#include <sys/stat.h>
|
|
#include <fcntl.h>
|
|
#include <stddef.h>
|
|
#include <stdlib.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
#include <limits.h>
|
|
#include <sys/mman.h>
|
|
#include <sys/param.h>
|
|
#include <netinet/in.h>
|
|
#include <sys/types.h>
|
|
#include <dirent.h>
|
|
|
|
#include SHA1_HEADER
|
|
#include <zlib.h>
|
|
|
|
#if ZLIB_VERNUM < 0x1200
|
|
#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
|
|
#endif
|
|
|
|
#ifdef DT_UNKNOWN
|
|
#define DTYPE(de) ((de)->d_type)
|
|
#else
|
|
#define DT_UNKNOWN 0
|
|
#define DT_DIR 1
|
|
#define DT_REG 2
|
|
#define DT_LNK 3
|
|
#define DTYPE(de) DT_UNKNOWN
|
|
#endif
|
|
|
|
#ifdef __GNUC__
|
|
#define NORETURN __attribute__((__noreturn__))
|
|
#else
|
|
#define NORETURN
|
|
#ifndef __attribute__
|
|
#define __attribute__(x)
|
|
#endif
|
|
#endif
|
|
|
|
/*
|
|
* Intensive research over the course of many years has shown that
|
|
* port 9418 is totally unused by anything else. Or
|
|
*
|
|
* Your search - "port 9418" - did not match any documents.
|
|
*
|
|
* as www.google.com puts it.
|
|
*
|
|
* This port has been properly assigned for git use by IANA:
|
|
* git (Assigned-9418) [I06-050728-0001].
|
|
*
|
|
* git 9418/tcp git pack transfer service
|
|
* git 9418/udp git pack transfer service
|
|
*
|
|
* with Linus Torvalds <torvalds@osdl.org> as the point of
|
|
* contact. September 2005.
|
|
*
|
|
* See http://www.iana.org/assignments/port-numbers
|
|
*/
|
|
#define DEFAULT_GIT_PORT 9418
|
|
|
|
/*
|
|
* Basic data structures for the directory cache
|
|
*/
|
|
|
|
#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
|
|
struct cache_header {
|
|
unsigned int hdr_signature;
|
|
unsigned int hdr_version;
|
|
unsigned int hdr_entries;
|
|
};
|
|
|
|
/*
|
|
* The "cache_time" is just the low 32 bits of the
|
|
* time. It doesn't matter if it overflows - we only
|
|
* check it for equality in the 32 bits we save.
|
|
*/
|
|
struct cache_time {
|
|
unsigned int sec;
|
|
unsigned int nsec;
|
|
};
|
|
|
|
/*
|
|
* dev/ino/uid/gid/size are also just tracked to the low 32 bits
|
|
* Again - this is just a (very strong in practice) heuristic that
|
|
* the inode hasn't changed.
|
|
*
|
|
* We save the fields in big-endian order to allow using the
|
|
* index file over NFS transparently.
|
|
*/
|
|
struct cache_entry {
|
|
struct cache_time ce_ctime;
|
|
struct cache_time ce_mtime;
|
|
unsigned int ce_dev;
|
|
unsigned int ce_ino;
|
|
unsigned int ce_mode;
|
|
unsigned int ce_uid;
|
|
unsigned int ce_gid;
|
|
unsigned int ce_size;
|
|
unsigned char sha1[20];
|
|
unsigned short ce_flags;
|
|
char name[0];
|
|
};
|
|
|
|
#define CE_NAMEMASK (0x0fff)
|
|
#define CE_STAGEMASK (0x3000)
|
|
#define CE_UPDATE (0x4000)
|
|
#define CE_STAGESHIFT 12
|
|
|
|
#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
|
|
#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
|
|
#define ce_size(ce) cache_entry_size(ce_namelen(ce))
|
|
#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
|
|
|
|
#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
|
|
static inline unsigned int create_ce_mode(unsigned int mode)
|
|
{
|
|
if (S_ISLNK(mode))
|
|
return htonl(S_IFLNK);
|
|
return htonl(S_IFREG | ce_permissions(mode));
|
|
}
|
|
|
|
#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
|
|
|
|
extern struct cache_entry **active_cache;
|
|
extern unsigned int active_nr, active_alloc, active_cache_changed;
|
|
|
|
#define GIT_DIR_ENVIRONMENT "GIT_DIR"
|
|
#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
|
|
#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
|
|
#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
|
|
#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
|
|
|
|
extern char *get_git_dir(void);
|
|
extern char *get_object_directory(void);
|
|
extern char *get_refs_directory(void);
|
|
extern char *get_index_file(void);
|
|
extern char *get_graft_file(void);
|
|
|
|
#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
|
|
|
|
extern const char **get_pathspec(const char *prefix, const char **pathspec);
|
|
extern const char *setup_git_directory(void);
|
|
extern const char *prefix_path(const char *prefix, int len, const char *path);
|
|
|
|
#define alloc_nr(x) (((x)+16)*3/2)
|
|
|
|
/* Initialize and use the cache information */
|
|
extern int read_cache(void);
|
|
extern int write_cache(int newfd, struct cache_entry **cache, int entries);
|
|
extern int cache_name_pos(const char *name, int namelen);
|
|
#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
|
|
#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
|
|
#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
|
|
extern int add_cache_entry(struct cache_entry *ce, int option);
|
|
extern int remove_cache_entry_at(int pos);
|
|
extern int remove_file_from_cache(const char *path);
|
|
extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
|
|
extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
|
|
extern int ce_modified(struct cache_entry *ce, struct stat *st);
|
|
extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
|
|
extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
|
|
extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
|
|
|
|
struct cache_file {
|
|
struct cache_file *next;
|
|
char lockfile[PATH_MAX];
|
|
};
|
|
extern int hold_index_file_for_update(struct cache_file *, const char *path);
|
|
extern int commit_index_file(struct cache_file *);
|
|
extern void rollback_index_file(struct cache_file *);
|
|
|
|
#define MTIME_CHANGED 0x0001
|
|
#define CTIME_CHANGED 0x0002
|
|
#define OWNER_CHANGED 0x0004
|
|
#define MODE_CHANGED 0x0008
|
|
#define INODE_CHANGED 0x0010
|
|
#define DATA_CHANGED 0x0020
|
|
#define TYPE_CHANGED 0x0040
|
|
|
|
/* Return a statically allocated filename matching the sha1 signature */
|
|
extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
|
|
extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
|
|
extern char *sha1_file_name(const unsigned char *sha1);
|
|
extern char *sha1_pack_name(const unsigned char *sha1);
|
|
extern char *sha1_pack_index_name(const unsigned char *sha1);
|
|
|
|
int git_mkstemp(char *path, size_t n, const char *template);
|
|
|
|
int safe_create_leading_directories(char *path);
|
|
char *safe_strncpy(char *, const char *, size_t);
|
|
|
|
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
|
|
extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
|
|
extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
|
|
extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
|
|
extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
|
|
extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
|
|
extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
|
|
extern char *write_sha1_file_prepare(void *buf,
|
|
unsigned long len,
|
|
const char *type,
|
|
unsigned char *sha1,
|
|
unsigned char *hdr,
|
|
int *hdrlen);
|
|
|
|
extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
|
|
|
|
/* Read a tree into the cache */
|
|
extern int read_tree(void *buffer, unsigned long size, int stage, const char **paths);
|
|
|
|
extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
|
|
size_t bufsize, size_t *bufposn);
|
|
extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
|
|
|
|
extern int has_sha1_pack(const unsigned char *sha1);
|
|
extern int has_sha1_file(const unsigned char *sha1);
|
|
|
|
extern int has_pack_file(const unsigned char *sha1);
|
|
extern int has_pack_index(const unsigned char *sha1);
|
|
|
|
/* Convert to/from hex/sha1 representation */
|
|
extern int get_sha1(const char *str, unsigned char *sha1);
|
|
extern int get_sha1_hex(const char *hex, unsigned char *sha1);
|
|
extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
|
|
|
|
/* General helper functions */
|
|
extern void usage(const char *err) NORETURN;
|
|
extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
|
|
extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
|
|
|
|
extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
|
|
extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
|
|
|
|
extern void *read_object_with_reference(const unsigned char *sha1,
|
|
const char *required_type,
|
|
unsigned long *size,
|
|
unsigned char *sha1_ret);
|
|
|
|
const char *show_date(unsigned long time, int timezone);
|
|
int parse_date(const char *date, char *buf, int bufsize);
|
|
void datestamp(char *buf, int bufsize);
|
|
|
|
extern int setup_ident(void);
|
|
extern char *get_ident(const char *name, const char *email, const char *date_str);
|
|
extern char *git_author_info(void);
|
|
extern char *git_committer_info(void);
|
|
|
|
static inline void *xmalloc(size_t size)
|
|
{
|
|
void *ret = malloc(size);
|
|
if (!ret)
|
|
die("Out of memory, malloc failed");
|
|
return ret;
|
|
}
|
|
|
|
static inline void *xrealloc(void *ptr, size_t size)
|
|
{
|
|
void *ret = realloc(ptr, size);
|
|
if (!ret)
|
|
die("Out of memory, realloc failed");
|
|
return ret;
|
|
}
|
|
|
|
static inline void *xcalloc(size_t nmemb, size_t size)
|
|
{
|
|
void *ret = calloc(nmemb, size);
|
|
if (!ret)
|
|
die("Out of memory, calloc failed");
|
|
return ret;
|
|
}
|
|
|
|
struct checkout {
|
|
const char *base_dir;
|
|
int base_dir_len;
|
|
unsigned force:1,
|
|
quiet:1,
|
|
not_new:1,
|
|
refresh_cache:1;
|
|
};
|
|
|
|
extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
|
|
|
|
extern struct alternate_object_database {
|
|
struct alternate_object_database *next;
|
|
char *name;
|
|
char base[0]; /* more */
|
|
} *alt_odb_list;
|
|
extern void prepare_alt_odb(void);
|
|
|
|
extern struct packed_git {
|
|
struct packed_git *next;
|
|
unsigned long index_size;
|
|
unsigned long pack_size;
|
|
unsigned int *index_base;
|
|
void *pack_base;
|
|
unsigned int pack_last_used;
|
|
unsigned int pack_use_cnt;
|
|
unsigned char sha1[20];
|
|
char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
|
|
} *packed_git;
|
|
|
|
struct pack_entry {
|
|
unsigned int offset;
|
|
unsigned char sha1[20];
|
|
struct packed_git *p;
|
|
};
|
|
|
|
struct ref {
|
|
struct ref *next;
|
|
unsigned char old_sha1[20];
|
|
unsigned char new_sha1[20];
|
|
unsigned char force;
|
|
struct ref *peer_ref; /* when renaming */
|
|
char name[0];
|
|
};
|
|
|
|
extern int git_connect(int fd[2], char *url, const char *prog);
|
|
extern int finish_connect(pid_t pid);
|
|
extern int path_match(const char *path, int nr, char **match);
|
|
extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
|
|
int nr_refspec, char **refspec, int all);
|
|
extern int get_ack(int fd, unsigned char *result_sha1);
|
|
extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match);
|
|
|
|
extern struct packed_git *parse_pack_index(unsigned char *sha1);
|
|
extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
|
|
char *idx_path);
|
|
|
|
extern void prepare_packed_git(void);
|
|
extern void install_packed_git(struct packed_git *pack);
|
|
|
|
extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
|
|
struct packed_git *packs);
|
|
|
|
extern int use_packed_git(struct packed_git *);
|
|
extern void unuse_packed_git(struct packed_git *);
|
|
extern struct packed_git *add_packed_git(char *, int);
|
|
extern int num_packed_objects(const struct packed_git *p);
|
|
extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
|
|
extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
|
|
extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
|
|
extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);
|
|
|
|
/* Dumb servers support */
|
|
extern int update_server_info(int);
|
|
|
|
#endif /* CACHE_H */
|