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278 lines
8.5 KiB
278 lines
8.5 KiB
#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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#include <sys/mman.h> |
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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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#endif |
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/* |
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* Environment variables transition. |
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* We accept older names for now but warn. |
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*/ |
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extern char *gitenv_bc(const char *); |
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#define gitenv(e) (getenv(e) ? : gitenv_bc(e)) |
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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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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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#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" |
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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(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 index_fd(unsigned char *sha1, int fd, struct stat *st); |
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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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#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 *git_path(const char *fmt, ...); |
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extern char *sha1_file_name(const unsigned char *sha1); |
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/* Read and unpack a sha1 file into memory, write memory to a sha1 file */ |
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extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); |
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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 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); |
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extern int write_sha1_from_fd(const unsigned char *sha1, int fd); |
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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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/* 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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/* 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; |
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extern int error(const char *err, ...); |
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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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void parse_date(char *date, char *buf, int bufsize); |
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void datestamp(char *buf, int bufsize); |
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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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char *base; |
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char *name; |
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} *alt_odb; |
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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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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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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 get_ack(int fd, unsigned char *result_sha1); |
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extern void prepare_packed_git(void); |
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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); |
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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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#endif /* CACHE_H */
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