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27 results

cache.h

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  • cache.h 13.43 KiB
    #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>
    #ifndef NO_MMAP
    #include <sys/mman.h>
    #endif
    #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 int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
    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 *);
    
    extern int trust_executable_bit;
    extern int only_use_symrefs;
    extern int diff_rename_limit_default;
    
    #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);
    extern const char *find_unique_abbrev(const unsigned char *sha1, int);
    extern const unsigned char null_sha1[20];
    
    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 move_temp_to_file(const char *tmpfile, char *filename);
    
    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! */
    extern int read_ref(const char *filename, unsigned char *sha1);
    extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
    extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
    extern int validate_symref(const char *git_HEAD);
    
    /* 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;
    	int pack_local;
    	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, int ignore_funny);
    extern int server_supports(const char *feature);
    
    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, 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);
    
    #ifdef NO_MMAP
    
    #ifndef PROT_READ
    #define PROT_READ 1
    #define PROT_WRITE 2
    #define MAP_PRIVATE 1
    #define MAP_FAILED ((void*)-1)
    #endif
    
    extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
    extern int gitfakemunmap(void *start, size_t length);
    
    #endif
    
    typedef int (*config_fn_t)(const char *, const char *);
    extern int git_default_config(const char *, const char *);
    extern int git_config(config_fn_t fn);
    extern int git_config_int(const char *, const char *);
    extern int git_config_bool(const char *, const char *);
    
    #define MAX_GITNAME (1000)
    extern char git_default_email[MAX_GITNAME];
    extern char git_default_name[MAX_GITNAME];
    
    /* Sane ctype - no locale, and works with signed chars */
    #undef isspace
    #undef isdigit
    #undef isalpha
    #undef isalnum
    #undef tolower
    #undef toupper
    extern unsigned char sane_ctype[256];
    #define GIT_SPACE 0x01
    #define GIT_DIGIT 0x02
    #define GIT_ALPHA 0x04
    #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
    #define isspace(x) sane_istest(x,GIT_SPACE)
    #define isdigit(x) sane_istest(x,GIT_DIGIT)
    #define isalpha(x) sane_istest(x,GIT_ALPHA)
    #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
    #define tolower(x) sane_case((unsigned char)(x), 0x20)
    #define toupper(x) sane_case((unsigned char)(x), 0)
    
    static inline int sane_case(int x, int high)
    {
    	if (sane_istest(x, GIT_ALPHA))
    		x = (x & ~0x20) | high;
    	return x;
    }
    
    extern int copy_fd(int ifd, int ofd);
    #endif /* CACHE_H */