#ifndef CACHE_H
#define CACHE_H
+#include <unistd.h>
#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.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 <openssl/sha.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
+
/*
- * Basic data structures for the directory cache
+ * 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.
*
- * NOTE NOTE NOTE! This is all in the native CPU byte format. It's
- * not even trying to be portable. It's trying to be efficient. It's
- * just a cache, after all.
+ * 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 signature;
- unsigned int version;
- unsigned int entries;
- unsigned char sha1[20];
+ unsigned int hdr_signature;
+ unsigned int hdr_version;
+ unsigned int hdr_entries;
};
/*
* 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 ctime;
- struct cache_time mtime;
- unsigned int st_dev;
- unsigned int st_ino;
- unsigned int st_mode;
- unsigned int st_uid;
- unsigned int st_gid;
- unsigned int st_size;
+ 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 namelen;
+ unsigned short ce_flags;
char name[0];
};
-const char *sha1_file_directory;
-struct cache_entry **active_cache;
-unsigned int active_nr, active_alloc;
+#define CE_NAMEMASK (0x0fff)
+#define CE_STAGEMASK (0x3000)
+#define CE_UPDATE (0x4000)
+#define CE_STAGESHIFT 12
-#define DB_ENVIRONMENT "SHA1_FILE_DIRECTORY"
-#define DEFAULT_DB_ENVIRONMENT ".dircache/objects"
+#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)
-#define ce_size(ce) cache_entry_size((ce)->namelen)
+
+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)
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);
-extern int add_cache_entry(struct cache_entry *ce);
+#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 cache_match_stat(struct cache_entry *ce, struct stat *st);
+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 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 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 *sha1_file_name(unsigned char *sha1);
+extern char *mkpath(const char *fmt, ...);
+extern char *git_path(const char *fmt, ...);
+extern char *sha1_file_name(const unsigned char *sha1);
-/* Write a memory buffer out to the sha file */
-extern int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size);
+int safe_create_leading_directories(char *path);
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
-extern void * map_sha1_file(unsigned char *sha1, unsigned long *size);
+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(unsigned char *sha1, char *type, unsigned long *size);
-extern int write_sha1_file(char *buf, unsigned len);
-extern int check_sha1_signature(unsigned char *sha1, void *buf, 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);
+
+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);
+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);
+
+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;
+};
+
+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 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 */