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Diffstat (limited to 'cache.h')
| -rw-r--r-- | cache.h | 600 |
1 files changed, 600 insertions, 0 deletions
diff --git a/cache.h b/cache.h new file mode 100644 index 0000000000..c7e00e7b05 --- /dev/null +++ b/cache.h @@ -0,0 +1,600 @@ +#ifndef CACHE_H +#define CACHE_H + +#include "git-compat-util.h" + +#include SHA1_HEADER +#include <zlib.h> + +#if ZLIB_VERNUM < 0x1200 +#define deflateBound(c,s) ((s) + (((s) + 7) >> 3) + (((s) + 63) >> 6) + 11) +#endif + +#if defined(DT_UNKNOWN) && !defined(NO_D_TYPE_IN_DIRENT) +#define DTYPE(de) ((de)->d_type) +#else +#undef DT_UNKNOWN +#undef DT_DIR +#undef DT_REG +#undef DT_LNK +#define DT_UNKNOWN 0 +#define DT_DIR 1 +#define DT_REG 2 +#define DT_LNK 3 +#define DTYPE(de) DT_UNKNOWN +#endif + +/* unknown mode (impossible combination S_IFIFO|S_IFCHR) */ +#define S_IFINVALID 0030000 + +/* + * A "directory link" is a link to another git directory. + * + * The value 0160000 is not normally a valid mode, and + * also just happens to be S_IFDIR + S_IFLNK + * + * NOTE! We *really* shouldn't depend on the S_IFxxx macros + * always having the same values everywhere. We should use + * our internal git values for these things, and then we can + * translate that to the OS-specific value. It just so + * happens that everybody shares the same bit representation + * in the UNIX world (and apparently wider too..) + */ +#define S_IFGITLINK 0160000 +#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK) + +/* + * 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 <torvalds@osdl.org> 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[FLEX_ARRAY]; /* more */ +}; + +#define CE_NAMEMASK (0x0fff) +#define CE_STAGEMASK (0x3000) +#define CE_UPDATE (0x4000) +#define CE_VALID (0x8000) +#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); + if (S_ISDIR(mode) || S_ISGITLINK(mode)) + return htonl(S_IFGITLINK); + return htonl(S_IFREG | ce_permissions(mode)); +} +static inline unsigned int ce_mode_from_stat(struct cache_entry *ce, unsigned int mode) +{ + extern int trust_executable_bit, has_symlinks; + if (!has_symlinks && S_ISREG(mode) && + ce && S_ISLNK(ntohl(ce->ce_mode))) + return ce->ce_mode; + if (!trust_executable_bit && S_ISREG(mode)) { + if (ce && S_ISREG(ntohl(ce->ce_mode))) + return ce->ce_mode; + return create_ce_mode(0666); + } + return create_ce_mode(mode); +} +#define canon_mode(mode) \ + (S_ISREG(mode) ? (S_IFREG | ce_permissions(mode)) : \ + S_ISLNK(mode) ? S_IFLNK : S_ISDIR(mode) ? S_IFDIR : S_IFGITLINK) + +#define cache_entry_size(len) ((offsetof(struct cache_entry,name) + (len) + 8) & ~7) + +struct index_state { + struct cache_entry **cache; + unsigned int cache_nr, cache_alloc, cache_changed; + struct cache_tree *cache_tree; + time_t timestamp; + void *mmap; + size_t mmap_size; +}; + +extern struct index_state the_index; + +#ifndef NO_THE_INDEX_COMPATIBILITY_MACROS +#define active_cache (the_index.cache) +#define active_nr (the_index.cache_nr) +#define active_alloc (the_index.cache_alloc) +#define active_cache_changed (the_index.cache_changed) +#define active_cache_tree (the_index.cache_tree) + +#define read_cache() read_index(&the_index) +#define read_cache_from(path) read_index_from(&the_index, (path)) +#define write_cache(newfd, cache, entries) write_index(&the_index, (newfd)) +#define discard_cache() discard_index(&the_index) +#define cache_name_pos(name, namelen) index_name_pos(&the_index,(name),(namelen)) +#define add_cache_entry(ce, option) add_index_entry(&the_index, (ce), (option)) +#define remove_cache_entry_at(pos) remove_index_entry_at(&the_index, (pos)) +#define remove_file_from_cache(path) remove_file_from_index(&the_index, (path)) +#define add_file_to_cache(path, verbose) add_file_to_index(&the_index, (path), (verbose)) +#define refresh_cache(flags) refresh_index(&the_index, (flags), NULL, NULL) +#define ce_match_stat(ce, st, really) ie_match_stat(&the_index, (ce), (st), (really)) +#define ce_modified(ce, st, really) ie_modified(&the_index, (ce), (st), (really)) +#endif + +enum object_type { + OBJ_BAD = -1, + OBJ_NONE = 0, + OBJ_COMMIT = 1, + OBJ_TREE = 2, + OBJ_BLOB = 3, + OBJ_TAG = 4, + /* 5 for future expansion */ + OBJ_OFS_DELTA = 6, + OBJ_REF_DELTA = 7, + OBJ_MAX, +}; + +#define GIT_DIR_ENVIRONMENT "GIT_DIR" +#define GIT_WORK_TREE_ENVIRONMENT "GIT_WORK_TREE" +#define DEFAULT_GIT_DIR_ENVIRONMENT ".git" +#define DB_ENVIRONMENT "GIT_OBJECT_DIRECTORY" +#define INDEX_ENVIRONMENT "GIT_INDEX_FILE" +#define GRAFT_ENVIRONMENT "GIT_GRAFT_FILE" +#define TEMPLATE_DIR_ENVIRONMENT "GIT_TEMPLATE_DIR" +#define CONFIG_ENVIRONMENT "GIT_CONFIG" +#define CONFIG_LOCAL_ENVIRONMENT "GIT_CONFIG_LOCAL" +#define EXEC_PATH_ENVIRONMENT "GIT_EXEC_PATH" +#define GITATTRIBUTES_FILE ".gitattributes" +#define INFOATTRIBUTES_FILE "info/attributes" +#define ATTRIBUTE_MACRO_PREFIX "[attr]" + +extern int is_bare_repository_cfg; +extern int is_bare_repository(void); +extern int is_inside_git_dir(void); +extern char *git_work_tree_cfg; +extern int is_inside_work_tree(void); +extern const 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); +extern int set_git_dir(const char *path); +extern const char *get_git_work_tree(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_gently(int *); +extern const char *setup_git_directory(void); +extern const char *prefix_path(const char *prefix, int len, const char *path); +extern const char *prefix_filename(const char *prefix, int len, const char *path); +extern void verify_filename(const char *prefix, const char *name); +extern void verify_non_filename(const char *prefix, const char *name); + +#define alloc_nr(x) (((x)+16)*3/2) + +/* + * Realloc the buffer pointed at by variable 'x' so that it can hold + * at least 'nr' entries; the number of entries currently allocated + * is 'alloc', using the standard growing factor alloc_nr() macro. + * + * DO NOT USE any expression with side-effect for 'x' or 'alloc'. + */ +#define ALLOC_GROW(x, nr, alloc) \ + do { \ + if ((nr) > alloc) { \ + if (alloc_nr(alloc) < (nr)) \ + alloc = (nr); \ + else \ + alloc = alloc_nr(alloc); \ + x = xrealloc((x), alloc * sizeof(*(x))); \ + } \ + } while(0) + +/* Initialize and use the cache information */ +extern int read_index(struct index_state *); +extern int read_index_from(struct index_state *, const char *path); +extern int write_index(struct index_state *, int newfd); +extern int discard_index(struct index_state *); +extern int verify_path(const char *path); +extern int index_name_pos(struct index_state *, 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 */ +#define ADD_CACHE_JUST_APPEND 8 /* Append only; tree.c::read_tree() */ +extern int add_index_entry(struct index_state *, struct cache_entry *ce, int option); +extern struct cache_entry *refresh_cache_entry(struct cache_entry *ce, int really); +extern int remove_index_entry_at(struct index_state *, int pos); +extern int remove_file_from_index(struct index_state *, const char *path); +extern int add_file_to_index(struct index_state *, const char *path, int verbose); +extern int ce_same_name(struct cache_entry *a, struct cache_entry *b); +extern int ie_match_stat(struct index_state *, struct cache_entry *, struct stat *, int); +extern int ie_modified(struct index_state *, struct cache_entry *, struct stat *, int); +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, enum object_type type, const char *path); +extern int read_fd(int fd, char **return_buf, unsigned long *return_size); +extern int index_pipe(unsigned char *sha1, int fd, const char *type, int write_object); +extern int index_path(unsigned char *sha1, const char *path, struct stat *st, int write_object); +extern void fill_stat_cache_info(struct cache_entry *ce, struct stat *st); + +#define REFRESH_REALLY 0x0001 /* ignore_valid */ +#define REFRESH_UNMERGED 0x0002 /* allow unmerged */ +#define REFRESH_QUIET 0x0004 /* be quiet about it */ +#define REFRESH_IGNORE_MISSING 0x0008 /* ignore non-existent */ +extern int refresh_index(struct index_state *, unsigned int flags, const char **pathspec, char *seen); + +struct lock_file { + struct lock_file *next; + pid_t owner; + char on_list; + char filename[PATH_MAX]; +}; +extern int hold_lock_file_for_update(struct lock_file *, const char *path, int); +extern int commit_lock_file(struct lock_file *); + +extern int hold_locked_index(struct lock_file *, int); +extern int commit_locked_index(struct lock_file *); +extern void set_alternate_index_output(const char *); + +extern void rollback_lock_file(struct lock_file *); +extern int delete_ref(const char *, const unsigned char *sha1); + +/* Environment bits from configuration mechanism */ +extern int trust_executable_bit; +extern int quote_path_fully; +extern int has_symlinks; +extern int assume_unchanged; +extern int prefer_symlink_refs; +extern int log_all_ref_updates; +extern int warn_ambiguous_refs; +extern int shared_repository; +extern const char *apply_default_whitespace; +extern int zlib_compression_level; +extern int core_compression_level; +extern int core_compression_seen; +extern size_t packed_git_window_size; +extern size_t packed_git_limit; +extern size_t delta_base_cache_limit; +extern int auto_crlf; + +#define GIT_REPO_VERSION 0 +extern int repository_format_version; +extern int check_repository_format(void); + +#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 char *find_unique_abbrev(const unsigned char *sha1, int); +extern const unsigned char null_sha1[20]; +static inline int is_null_sha1(const unsigned char *sha1) +{ + return !memcmp(sha1, null_sha1, 20); +} +static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2) +{ + return memcmp(sha1, sha2, 20); +} +static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src) +{ + memcpy(sha_dst, sha_src, 20); +} +static inline void hashclr(unsigned char *hash) +{ + memset(hash, 0, 20); +} + +int git_mkstemp(char *path, size_t n, const char *template); + +enum sharedrepo { + PERM_UMASK = 0, + PERM_GROUP, + PERM_EVERYBODY +}; +int git_config_perm(const char *var, const char *value); +int adjust_shared_perm(const char *path); +int safe_create_leading_directories(char *path); +char *enter_repo(char *path, int strict); +static inline int is_absolute_path(const char *path) +{ + return path[0] == '/'; +} +const char *make_absolute_path(const char *path); + +/* Read and unpack a sha1 file into memory, write memory to a sha1 file */ +extern int sha1_object_info(const unsigned char *, unsigned long *); +extern void * read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size); +extern int hash_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1); +extern int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *return_sha1); +extern int pretend_sha1_file(void *, unsigned long, enum object_type, unsigned char *); + +extern int check_sha1_signature(const unsigned char *sha1, void *buf, unsigned long size, const char *type); + +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 move_temp_to_file(const char *tmpfile, const char *filename); + +extern int has_sha1_pack(const unsigned char *sha1, const char **ignore); +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); + +extern const signed char hexval_table[256]; +static inline unsigned int hexval(unsigned char c) +{ + return hexval_table[c]; +} + +/* Convert to/from hex/sha1 representation */ +#define MINIMUM_ABBREV 4 +#define DEFAULT_ABBREV 7 + +extern int get_sha1(const char *str, unsigned char *sha1); +extern int get_sha1_with_mode(const char *str, unsigned char *sha1, unsigned *mode); +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, int *); +extern int dwim_ref(const char *str, int len, unsigned char *sha1, char **ref); +extern int dwim_log(const char *str, int len, unsigned char *sha1, char **ref); + +extern int create_symref(const char *ref, const char *refs_heads_master, const char *logmsg); +extern int validate_headref(const char *ref); + +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); + +enum date_mode { + DATE_NORMAL = 0, + DATE_RELATIVE, + DATE_SHORT, + DATE_LOCAL, + DATE_ISO8601, + DATE_RFC2822 +}; + +const char *show_date(unsigned long time, int timezone, enum date_mode mode); +int parse_date(const char *date, char *buf, int bufsize); +void datestamp(char *buf, int bufsize); +unsigned long approxidate(const char *); + +extern const char *git_author_info(int); +extern const char *git_committer_info(int); +extern const char *fmt_ident(const char *name, const char *email, const char *date_str, int); + +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, const struct checkout *state, char *topath); +extern int has_symlink_leading_path(const char *name, char *last_symlink); + +extern struct alternate_object_database { + struct alternate_object_database *next; + char *name; + char base[FLEX_ARRAY]; /* more */ +} *alt_odb_list; +extern void prepare_alt_odb(void); + +struct pack_window { + struct pack_window *next; + unsigned char *base; + off_t offset; + size_t len; + unsigned int last_used; + unsigned int inuse_cnt; +}; + +extern struct packed_git { + struct packed_git *next; + struct pack_window *windows; + off_t pack_size; + const void *index_data; + size_t index_size; + uint32_t num_objects; + int index_version; + time_t mtime; + int pack_fd; + int pack_local; + unsigned char sha1[20]; + /* something like ".git/objects/pack/xxxxx.pack" */ + char pack_name[FLEX_ARRAY]; /* more */ +} *packed_git; + +struct pack_entry { + off_t 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[FLEX_ARRAY]; /* more */ +}; + +#define REF_NORMAL (1u << 0) +#define REF_HEADS (1u << 1) +#define REF_TAGS (1u << 2) + +#define CONNECT_VERBOSE (1u << 0) +extern pid_t git_connect(int fd[2], char *url, const char *prog, int flags); +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, unsigned int flags); +extern int server_supports(const char *feature); + +extern struct packed_git *parse_pack_index(unsigned char *sha1); +extern struct packed_git *parse_pack_index_file(const unsigned char *sha1, + const char *idx_path); + +extern void prepare_packed_git(void); +extern void reprepare_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 void pack_report(void); +extern int open_pack_index(struct packed_git *); +extern unsigned char* use_pack(struct packed_git *, struct pack_window **, off_t, unsigned int *); +extern void unuse_pack(struct pack_window **); +extern struct packed_git *add_packed_git(const char *, int, int); +extern const unsigned char *nth_packed_object_sha1(struct packed_git *, uint32_t); +extern off_t find_pack_entry_one(const unsigned char *, struct packed_git *); +extern void *unpack_entry(struct packed_git *, off_t, enum object_type *, unsigned long *); +extern unsigned long unpack_object_header_gently(const unsigned char *buf, unsigned long len, enum object_type *type, unsigned long *sizep); +extern unsigned long get_size_from_delta(struct packed_git *, struct pack_window **, off_t); +extern const char *packed_object_info_detail(struct packed_git *, off_t, unsigned long *, unsigned long *, unsigned int *, unsigned char *); + +/* Dumb servers support */ +extern int update_server_info(int); + +typedef int (*config_fn_t)(const char *, const char *); +extern int git_default_config(const char *, const char *); +extern int git_config_from_file(config_fn_t fn, const char *); +extern int git_config(config_fn_t fn); +extern int git_parse_long(const char *, long *); +extern int git_parse_ulong(const char *, unsigned long *); +extern int git_config_int(const char *, const char *); +extern unsigned long git_config_ulong(const char *, const char *); +extern int git_config_bool(const char *, const char *); +extern int git_config_set(const char *, const char *); +extern int git_config_set_multivar(const char *, const char *, const char *, int); +extern int git_config_rename_section(const char *, const char *); +extern int check_repository_format_version(const char *var, const char *value); + +#define MAX_GITNAME (1000) +extern char git_default_email[MAX_GITNAME]; +extern char git_default_name[MAX_GITNAME]; + +extern const char *git_commit_encoding; +extern const char *git_log_output_encoding; + +/* IO helper functions */ +extern void maybe_flush_or_die(FILE *, const char *); +extern int copy_fd(int ifd, int ofd); +extern int read_in_full(int fd, void *buf, size_t count); +extern int write_in_full(int fd, const void *buf, size_t count); +extern void write_or_die(int fd, const void *buf, size_t count); +extern int write_or_whine(int fd, const void *buf, size_t count, const char *msg); +extern int write_or_whine_pipe(int fd, const void *buf, size_t count, const char *msg); + +/* pager.c */ +extern void setup_pager(void); +extern char *pager_program; +extern int pager_in_use; +extern int pager_use_color; + +extern char *editor_program; + +/* base85 */ +int decode_85(char *dst, const char *line, int linelen); +void encode_85(char *buf, const unsigned char *data, int bytes); + +/* alloc.c */ +extern void *alloc_blob_node(void); +extern void *alloc_tree_node(void); +extern void *alloc_commit_node(void); +extern void *alloc_tag_node(void); +extern void *alloc_object_node(void); +extern void alloc_report(void); + +/* trace.c */ +extern int nfasprintf(char **str, const char *fmt, ...); +extern int nfvasprintf(char **str, const char *fmt, va_list va); +extern void trace_printf(const char *format, ...); +extern void trace_argv_printf(const char **argv, int count, const char *format, ...); + +/* convert.c */ +extern char *convert_to_git(const char *path, const char *src, unsigned long *sizep); +extern char *convert_to_working_tree(const char *path, const char *src, unsigned long *sizep); +extern void *convert_sha1_file(const char *path, const unsigned char *sha1, unsigned int mode, enum object_type *type, unsigned long *size); + +/* match-trees.c */ +void shift_tree(const unsigned char *, const unsigned char *, unsigned char *, int); + +#endif /* CACHE_H */ |