#ifndef CACHE_H #define CACHE_H #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include SHA1_HEADER #include #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 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); 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 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); /* 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 */