зеркало из https://github.com/microsoft/git.git
419 строки
13 KiB
C
419 строки
13 KiB
C
#ifndef CACHE_H
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#define CACHE_H
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#include <unistd.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <limits.h>
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#ifndef NO_MMAP
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#include <sys/mman.h>
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#endif
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#include <sys/param.h>
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#include <netinet/in.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include SHA1_HEADER
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#include <zlib.h>
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#if ZLIB_VERNUM < 0x1200
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#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11)
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#endif
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#ifdef DT_UNKNOWN
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#define DTYPE(de) ((de)->d_type)
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#else
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#define DT_UNKNOWN 0
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#define DT_DIR 1
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#define DT_REG 2
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#define DT_LNK 3
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#define DTYPE(de) DT_UNKNOWN
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#endif
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#ifdef __GNUC__
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#define NORETURN __attribute__((__noreturn__))
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#else
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#define NORETURN
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#ifndef __attribute__
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#define __attribute__(x)
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#endif
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#endif
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/*
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* Intensive research over the course of many years has shown that
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* port 9418 is totally unused by anything else. Or
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*
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* Your search - "port 9418" - did not match any documents.
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*
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* as www.google.com puts it.
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*
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* This port has been properly assigned for git use by IANA:
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* git (Assigned-9418) [I06-050728-0001].
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*
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* git 9418/tcp git pack transfer service
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* git 9418/udp git pack transfer service
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*
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* with Linus Torvalds <torvalds@osdl.org> as the point of
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* contact. September 2005.
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*
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* See http://www.iana.org/assignments/port-numbers
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*/
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#define DEFAULT_GIT_PORT 9418
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/*
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* Basic data structures for the directory cache
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*/
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#define CACHE_SIGNATURE 0x44495243 /* "DIRC" */
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struct cache_header {
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unsigned int hdr_signature;
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unsigned int hdr_version;
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unsigned int hdr_entries;
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};
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/*
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* The "cache_time" is just the low 32 bits of the
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* time. It doesn't matter if it overflows - we only
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* check it for equality in the 32 bits we save.
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*/
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struct cache_time {
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unsigned int sec;
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unsigned int nsec;
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};
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/*
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* dev/ino/uid/gid/size are also just tracked to the low 32 bits
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* Again - this is just a (very strong in practice) heuristic that
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* the inode hasn't changed.
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*
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* We save the fields in big-endian order to allow using the
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* index file over NFS transparently.
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*/
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struct cache_entry {
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struct cache_time ce_ctime;
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struct cache_time ce_mtime;
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unsigned int ce_dev;
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unsigned int ce_ino;
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unsigned int ce_mode;
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unsigned int ce_uid;
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unsigned int ce_gid;
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unsigned int ce_size;
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unsigned char sha1[20];
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unsigned short ce_flags;
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char name[0];
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};
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#define CE_NAMEMASK (0x0fff)
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#define CE_STAGEMASK (0x3000)
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#define CE_UPDATE (0x4000)
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#define CE_STAGESHIFT 12
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#define create_ce_flags(len, stage) htons((len) | ((stage) << CE_STAGESHIFT))
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#define ce_namelen(ce) (CE_NAMEMASK & ntohs((ce)->ce_flags))
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#define ce_size(ce) cache_entry_size(ce_namelen(ce))
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#define ce_stage(ce) ((CE_STAGEMASK & ntohs((ce)->ce_flags)) >> CE_STAGESHIFT)
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#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
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static inline unsigned int create_ce_mode(unsigned int mode)
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{
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if (S_ISLNK(mode))
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return htonl(S_IFLNK);
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return htonl(S_IFREG | ce_permissions(mode));
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}
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#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7)
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extern struct cache_entry **active_cache;
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extern unsigned int active_nr, active_alloc, active_cache_changed;
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#define GIT_DIR_ENVIRONMENT "GIT_DIR"
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#define DEFAULT_GIT_DIR_ENVIRONMENT ".git"
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#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY"
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#define INDEX_ENVIRONMENT "GIT_INDEX_FILE"
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#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE"
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extern char *get_git_dir(void);
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extern char *get_object_directory(void);
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extern char *get_refs_directory(void);
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extern char *get_index_file(void);
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extern char *get_graft_file(void);
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#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES"
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extern const char **get_pathspec(const char *prefix, const char **pathspec);
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extern const char *setup_git_directory(void);
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extern const char *prefix_path(const char *prefix, int len, const char *path);
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#define alloc_nr(x) (((x)+16)*3/2)
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/* Initialize and use the cache information */
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extern int read_cache(void);
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extern int write_cache(int newfd, struct cache_entry **cache, int entries);
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extern int cache_name_pos(const char *name, int namelen);
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#define ADD_CACHE_OK_TO_ADD 1 /* Ok to add */
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#define ADD_CACHE_OK_TO_REPLACE 2 /* Ok to replace file/directory */
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#define ADD_CACHE_SKIP_DFCHECK 4 /* Ok to skip DF conflict checks */
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extern int add_cache_entry(struct cache_entry *ce, int option);
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extern int remove_cache_entry_at(int pos);
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extern int remove_file_from_cache(const char *path);
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extern int ce_same_name(struct cache_entry *a, struct cache_entry *b);
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extern int ce_match_stat(struct cache_entry *ce, struct stat *st);
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extern int ce_modified(struct cache_entry *ce, struct stat *st);
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extern int ce_path_match(const struct cache_entry *ce, const char **pathspec);
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extern int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type);
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extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object);
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extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st);
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struct cache_file {
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struct cache_file *next;
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char lockfile[PATH_MAX];
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};
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extern int hold_index_file_for_update(struct cache_file *, const char *path);
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extern int commit_index_file(struct cache_file *);
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extern void rollback_index_file(struct cache_file *);
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extern int trust_executable_bit;
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#define MTIME_CHANGED 0x0001
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#define CTIME_CHANGED 0x0002
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#define OWNER_CHANGED 0x0004
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#define MODE_CHANGED 0x0008
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#define INODE_CHANGED 0x0010
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#define DATA_CHANGED 0x0020
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#define TYPE_CHANGED 0x0040
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/* Return a statically allocated filename matching the sha1 signature */
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extern char *mkpath(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
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extern char *git_path(const char *fmt, ...) __attribute__((format (printf, 1, 2)));
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extern char *sha1_file_name(const unsigned char *sha1);
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extern char *sha1_pack_name(const unsigned char *sha1);
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extern char *sha1_pack_index_name(const unsigned char *sha1);
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extern const char *find_unique_abbrev(const unsigned char *sha1, int);
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extern const unsigned char null_sha1[20];
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int git_mkstemp(char *path, size_t n, const char *template);
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int safe_create_leading_directories(char *path);
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char *safe_strncpy(char *, const char *, size_t);
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/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
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extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);
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extern int parse_sha1_header(char *hdr, char *type, unsigned long *sizep);
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extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
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extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);
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extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
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extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1);
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extern char *write_sha1_file_prepare(void *buf,
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unsigned long len,
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const char *type,
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unsigned char *sha1,
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unsigned char *hdr,
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int *hdrlen);
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extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type);
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/* Read a tree into the cache */
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extern int read_tree(void *buffer, unsigned long size, int stage, const char **paths);
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extern int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
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size_t bufsize, size_t *bufposn);
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extern int write_sha1_to_fd(int fd, const unsigned char *sha1);
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extern int move_temp_to_file(const char *tmpfile, char *filename);
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extern int has_sha1_pack(const unsigned char *sha1);
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extern int has_sha1_file(const unsigned char *sha1);
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extern int has_pack_file(const unsigned char *sha1);
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extern int has_pack_index(const unsigned char *sha1);
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/* Convert to/from hex/sha1 representation */
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extern int get_sha1(const char *str, unsigned char *sha1);
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extern int get_sha1_hex(const char *hex, unsigned char *sha1);
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extern char *sha1_to_hex(const unsigned char *sha1); /* static buffer result! */
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extern int read_ref(const char *filename, unsigned char *sha1);
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extern const char *resolve_ref(const char *path, unsigned char *sha1, int);
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extern int create_symref(const char *git_HEAD, const char *refs_heads_master);
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extern int validate_symref(const char *git_HEAD);
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/* General helper functions */
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extern void usage(const char *err) NORETURN;
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extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
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extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
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extern int base_name_compare(const char *name1, int len1, int mode1, const char *name2, int len2, int mode2);
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extern int cache_name_compare(const char *name1, int len1, const char *name2, int len2);
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extern void *read_object_with_reference(const unsigned char *sha1,
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const char *required_type,
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unsigned long *size,
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unsigned char *sha1_ret);
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const char *show_date(unsigned long time, int timezone);
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int parse_date(const char *date, char *buf, int bufsize);
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void datestamp(char *buf, int bufsize);
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extern int setup_ident(void);
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extern char *get_ident(const char *name, const char *email, const char *date_str);
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extern char *git_author_info(void);
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extern char *git_committer_info(void);
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static inline void *xmalloc(size_t size)
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{
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void *ret = malloc(size);
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if (!ret)
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die("Out of memory, malloc failed");
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return ret;
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}
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static inline void *xrealloc(void *ptr, size_t size)
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{
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void *ret = realloc(ptr, size);
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if (!ret)
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die("Out of memory, realloc failed");
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return ret;
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}
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static inline void *xcalloc(size_t nmemb, size_t size)
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{
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void *ret = calloc(nmemb, size);
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if (!ret)
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die("Out of memory, calloc failed");
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return ret;
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}
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struct checkout {
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const char *base_dir;
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int base_dir_len;
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unsigned force:1,
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quiet:1,
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not_new:1,
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refresh_cache:1;
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};
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extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
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extern struct alternate_object_database {
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struct alternate_object_database *next;
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char *name;
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char base[0]; /* more */
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} *alt_odb_list;
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extern void prepare_alt_odb(void);
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extern struct packed_git {
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struct packed_git *next;
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unsigned long index_size;
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unsigned long pack_size;
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unsigned int *index_base;
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void *pack_base;
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unsigned int pack_last_used;
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unsigned int pack_use_cnt;
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int pack_local;
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unsigned char sha1[20];
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char pack_name[0]; /* something like ".git/objects/pack/xxxxx.pack" */
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} *packed_git;
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struct pack_entry {
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unsigned int offset;
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unsigned char sha1[20];
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struct packed_git *p;
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};
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struct ref {
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struct ref *next;
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unsigned char old_sha1[20];
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unsigned char new_sha1[20];
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unsigned char force;
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struct ref *peer_ref; /* when renaming */
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char name[0];
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};
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extern int git_connect(int fd[2], char *url, const char *prog);
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extern int finish_connect(pid_t pid);
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extern int path_match(const char *path, int nr, char **match);
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extern int match_refs(struct ref *src, struct ref *dst, struct ref ***dst_tail,
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int nr_refspec, char **refspec, int all);
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extern int get_ack(int fd, unsigned char *result_sha1);
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extern struct ref **get_remote_heads(int in, struct ref **list, int nr_match, char **match, int ignore_funny);
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extern int server_supports(const char *feature);
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extern struct packed_git *parse_pack_index(unsigned char *sha1);
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extern struct packed_git *parse_pack_index_file(const unsigned char *sha1,
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char *idx_path);
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extern void prepare_packed_git(void);
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extern void install_packed_git(struct packed_git *pack);
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extern struct packed_git *find_sha1_pack(const unsigned char *sha1,
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struct packed_git *packs);
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extern int use_packed_git(struct packed_git *);
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extern void unuse_packed_git(struct packed_git *);
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extern struct packed_git *add_packed_git(char *, int, int);
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extern int num_packed_objects(const struct packed_git *p);
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extern int nth_packed_object_sha1(const struct packed_git *, int, unsigned char*);
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extern int find_pack_entry_one(const unsigned char *, struct pack_entry *, struct packed_git *);
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extern void *unpack_entry_gently(struct pack_entry *, char *, unsigned long *);
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extern void packed_object_info_detail(struct pack_entry *, char *, unsigned long *, unsigned long *, int *, unsigned char *);
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/* Dumb servers support */
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extern int update_server_info(int);
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#ifdef NO_MMAP
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#ifndef PROT_READ
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#define PROT_READ 1
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#define PROT_WRITE 2
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#define MAP_PRIVATE 1
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#define MAP_FAILED ((void*)-1)
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#endif
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extern void *gitfakemmap(void *start, size_t length, int prot , int flags, int fd, off_t offset);
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extern int gitfakemunmap(void *start, size_t length);
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#endif
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typedef int (*config_fn_t)(const char *, const char *);
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extern int git_default_config(const char *, const char *);
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extern int git_config(config_fn_t fn);
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extern int git_config_int(const char *, const char *);
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extern int git_config_bool(const char *, const char *);
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#define MAX_GITNAME (1000)
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extern char git_default_email[MAX_GITNAME];
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extern char git_default_name[MAX_GITNAME];
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/* Sane ctype - no locale, and works with signed chars */
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#undef isspace
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#undef isdigit
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#undef isalpha
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#undef isalnum
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#undef tolower
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#undef toupper
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extern unsigned char sane_ctype[256];
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#define GIT_SPACE 0x01
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#define GIT_DIGIT 0x02
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#define GIT_ALPHA 0x04
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#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
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#define isspace(x) sane_istest(x,GIT_SPACE)
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#define isdigit(x) sane_istest(x,GIT_DIGIT)
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#define isalpha(x) sane_istest(x,GIT_ALPHA)
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#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
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#define tolower(x) sane_case((unsigned char)(x), 0x20)
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#define toupper(x) sane_case((unsigned char)(x), 0)
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static inline int sane_case(int x, int high)
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{
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if (sane_istest(x, GIT_ALPHA))
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x = (x & ~0x20) | high;
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return x;
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}
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extern int copy_fd(int ifd, int ofd);
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#endif /* CACHE_H */
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