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Diffstat (limited to 'cache.h')
| -rw-r--r-- | cache.h | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/cache.h b/cache.h new file mode 100644 index 0000000000..150e144c5e --- /dev/null +++ b/cache.h @@ -0,0 +1,311 @@ +#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 +#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. + */ +#define DEFAULT_GIT_PORT 9418 + +/* + * Environment variables transition. + * We accept older names for now but warn. + */ +extern char *gitenv_bc(const char *); +#define gitenv(e) (getenv(e) ? : gitenv_bc(e)) + +/* + * 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" + +extern char *get_object_directory(void); +extern char *get_refs_directory(void); +extern char *get_index_file(void); + +#define ALTERNATE_DB_ENVIRONMENT "GIT_ALTERNATE_OBJECT_DIRECTORIES" + +#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(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_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, ...); +extern char *git_path(const char *fmt, ...); +extern char *sha1_file_name(const unsigned char *sha1); + +int safe_create_leading_directories(char *path); + +/* 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); +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); + +/* 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; +extern int error(const char *err, ...); + +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); +void 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 { + char *base; + char *name; +} *alt_odb; +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; + 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]; + 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 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 void prepare_packed_git(void); +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 *); + +#endif /* CACHE_H */ |