mirror of
https://github.com/git/git
synced 2024-08-28 20:20:07 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
Work to support a repository that work with both SHA-1 and SHA-256 hash algorithms has started. * eb/hash-transition: (30 commits) t1016-compatObjectFormat: add tests to verify the conversion between objects t1006: test oid compatibility with cat-file t1006: rename sha1 to oid test-lib: compute the compatibility hash so tests may use it builtin/ls-tree: let the oid determine the output algorithm object-file: handle compat objects in check_object_signature tree-walk: init_tree_desc take an oid to get the hash algorithm builtin/cat-file: let the oid determine the output algorithm rev-parse: add an --output-object-format parameter repository: implement extensions.compatObjectFormat object-file: update object_info_extended to reencode objects object-file-convert: convert commits that embed signed tags object-file-convert: convert commit objects when writing object-file-convert: don't leak when converting tag objects object-file-convert: convert tag objects when writing object-file-convert: add a function to convert trees between algorithms object: factor out parse_mode out of fast-import and tree-walk into in object.h cache: add a function to read an OID of a specific algorithm tag: sign both hashes commit: export add_header_signature to support handling signatures on tags ...
309 lines
9.1 KiB
C
309 lines
9.1 KiB
C
#ifndef OBJECT_H
|
|
#define OBJECT_H
|
|
|
|
#include "hash-ll.h"
|
|
|
|
struct buffer_slab;
|
|
struct repository;
|
|
|
|
struct parsed_object_pool {
|
|
struct object **obj_hash;
|
|
int nr_objs, obj_hash_size;
|
|
|
|
/* TODO: migrate alloc_states to mem-pool? */
|
|
struct alloc_state *blob_state;
|
|
struct alloc_state *tree_state;
|
|
struct alloc_state *commit_state;
|
|
struct alloc_state *tag_state;
|
|
struct alloc_state *object_state;
|
|
|
|
/* parent substitutions from .git/info/grafts and .git/shallow */
|
|
struct commit_graft **grafts;
|
|
int grafts_alloc, grafts_nr;
|
|
|
|
int is_shallow;
|
|
struct stat_validity *shallow_stat;
|
|
char *alternate_shallow_file;
|
|
|
|
int commit_graft_prepared;
|
|
int substituted_parent;
|
|
|
|
struct buffer_slab *buffer_slab;
|
|
};
|
|
|
|
struct parsed_object_pool *parsed_object_pool_new(void);
|
|
void parsed_object_pool_clear(struct parsed_object_pool *o);
|
|
|
|
struct object_list {
|
|
struct object *item;
|
|
struct object_list *next;
|
|
};
|
|
|
|
struct object_array {
|
|
unsigned int nr;
|
|
unsigned int alloc;
|
|
struct object_array_entry {
|
|
struct object *item;
|
|
/*
|
|
* name or NULL. If non-NULL, the memory pointed to
|
|
* is owned by this object *except* if it points at
|
|
* object_array_slopbuf, which is a static copy of the
|
|
* empty string.
|
|
*/
|
|
char *name;
|
|
char *path;
|
|
unsigned mode;
|
|
} *objects;
|
|
};
|
|
|
|
#define OBJECT_ARRAY_INIT { 0 }
|
|
|
|
void object_array_init(struct object_array *array);
|
|
|
|
/*
|
|
* object flag allocation:
|
|
* revision.h: 0---------10 15 23------27
|
|
* fetch-pack.c: 01 67
|
|
* negotiator/default.c: 2--5
|
|
* walker.c: 0-2
|
|
* upload-pack.c: 4 11-----14 16-----19
|
|
* builtin/blame.c: 12-13
|
|
* bisect.c: 16
|
|
* bundle.c: 16
|
|
* http-push.c: 11-----14
|
|
* commit-graph.c: 15
|
|
* commit-reach.c: 16-----19
|
|
* sha1-name.c: 20
|
|
* list-objects-filter.c: 21
|
|
* builtin/fsck.c: 0--3
|
|
* builtin/gc.c: 0
|
|
* builtin/index-pack.c: 2021
|
|
* reflog.c: 10--12
|
|
* builtin/show-branch.c: 0-------------------------------------------26
|
|
* builtin/unpack-objects.c: 2021
|
|
*/
|
|
#define FLAG_BITS 28
|
|
|
|
#define TYPE_BITS 3
|
|
|
|
/*
|
|
* Values in this enum (except those outside the 3 bit range) are part
|
|
* of pack file format. See gitformat-pack(5) for more information.
|
|
*/
|
|
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_ANY,
|
|
OBJ_MAX
|
|
};
|
|
|
|
/* 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
|
|
*/
|
|
#define S_IFGITLINK 0160000
|
|
#define S_ISGITLINK(m) (((m) & S_IFMT) == S_IFGITLINK)
|
|
|
|
#define S_ISSPARSEDIR(m) ((m) == S_IFDIR)
|
|
|
|
static inline enum object_type object_type(unsigned int mode)
|
|
{
|
|
return S_ISDIR(mode) ? OBJ_TREE :
|
|
S_ISGITLINK(mode) ? OBJ_COMMIT :
|
|
OBJ_BLOB;
|
|
}
|
|
|
|
#define ce_permissions(mode) (((mode) & 0100) ? 0755 : 0644)
|
|
static inline unsigned int create_ce_mode(unsigned int mode)
|
|
{
|
|
if (S_ISLNK(mode))
|
|
return S_IFLNK;
|
|
if (S_ISSPARSEDIR(mode))
|
|
return S_IFDIR;
|
|
if (S_ISDIR(mode) || S_ISGITLINK(mode))
|
|
return S_IFGITLINK;
|
|
return S_IFREG | ce_permissions(mode);
|
|
}
|
|
|
|
static inline unsigned int canon_mode(unsigned int mode)
|
|
{
|
|
if (S_ISREG(mode))
|
|
return S_IFREG | ce_permissions(mode);
|
|
if (S_ISLNK(mode))
|
|
return S_IFLNK;
|
|
if (S_ISDIR(mode))
|
|
return S_IFDIR;
|
|
return S_IFGITLINK;
|
|
}
|
|
|
|
/*
|
|
* The object type is stored in 3 bits.
|
|
*/
|
|
struct object {
|
|
unsigned parsed : 1;
|
|
unsigned type : TYPE_BITS;
|
|
unsigned flags : FLAG_BITS;
|
|
struct object_id oid;
|
|
};
|
|
|
|
const char *type_name(unsigned int type);
|
|
int type_from_string_gently(const char *str, ssize_t, int gentle);
|
|
#define type_from_string(str) type_from_string_gently(str, -1, 0)
|
|
|
|
/*
|
|
* Return the current number of buckets in the object hashmap.
|
|
*/
|
|
unsigned int get_max_object_index(void);
|
|
|
|
/*
|
|
* Return the object from the specified bucket in the object hashmap.
|
|
*/
|
|
struct object *get_indexed_object(unsigned int);
|
|
|
|
/*
|
|
* This can be used to see if we have heard of the object before, but
|
|
* it can return "yes we have, and here is a half-initialised object"
|
|
* for an object that we haven't loaded/parsed yet.
|
|
*
|
|
* When parsing a commit to create an in-core commit object, its
|
|
* parents list holds commit objects that represent its parents, but
|
|
* they are expected to be lazily initialized and do not know what
|
|
* their trees or parents are yet. When this function returns such a
|
|
* half-initialised objects, the caller is expected to initialize them
|
|
* by calling parse_object() on them.
|
|
*/
|
|
struct object *lookup_object(struct repository *r, const struct object_id *oid);
|
|
|
|
void *create_object(struct repository *r, const struct object_id *oid, void *obj);
|
|
|
|
void *object_as_type(struct object *obj, enum object_type type, int quiet);
|
|
|
|
|
|
static inline const char *parse_mode(const char *str, uint16_t *modep)
|
|
{
|
|
unsigned char c;
|
|
unsigned int mode = 0;
|
|
|
|
if (*str == ' ')
|
|
return NULL;
|
|
|
|
while ((c = *str++) != ' ') {
|
|
if (c < '0' || c > '7')
|
|
return NULL;
|
|
mode = (mode << 3) + (c - '0');
|
|
}
|
|
*modep = mode;
|
|
return str;
|
|
}
|
|
|
|
/*
|
|
* Returns the object, having parsed it to find out what it is.
|
|
*
|
|
* Returns NULL if the object is missing or corrupt.
|
|
*/
|
|
enum parse_object_flags {
|
|
PARSE_OBJECT_SKIP_HASH_CHECK = 1 << 0,
|
|
PARSE_OBJECT_DISCARD_TREE = 1 << 1,
|
|
};
|
|
struct object *parse_object(struct repository *r, const struct object_id *oid);
|
|
struct object *parse_object_with_flags(struct repository *r,
|
|
const struct object_id *oid,
|
|
enum parse_object_flags flags);
|
|
|
|
/*
|
|
* Like parse_object, but will die() instead of returning NULL. If the
|
|
* "name" parameter is not NULL, it is included in the error message
|
|
* (otherwise, the hex object ID is given).
|
|
*/
|
|
struct object *parse_object_or_die(const struct object_id *oid, const char *name);
|
|
|
|
/* Given the result of read_sha1_file(), returns the object after
|
|
* parsing it. eaten_p indicates if the object has a borrowed copy
|
|
* of buffer and the caller should not free() it.
|
|
*/
|
|
struct object *parse_object_buffer(struct repository *r, const struct object_id *oid, enum object_type type, unsigned long size, void *buffer, int *eaten_p);
|
|
|
|
/*
|
|
* Allocate and return an object struct, even if you do not know the type of
|
|
* the object. The returned object may have its "type" field set to a real type
|
|
* (if somebody previously called lookup_blob(), etc), or it may be set to
|
|
* OBJ_NONE. In the latter case, subsequent calls to lookup_blob(), etc, will
|
|
* set the type field as appropriate.
|
|
*
|
|
* Use this when you do not know the expected type of an object and want to
|
|
* avoid parsing it for efficiency reasons. Try to avoid it otherwise; it
|
|
* may allocate excess memory, since the returned object must be as large as
|
|
* the maximum struct of any type.
|
|
*/
|
|
struct object *lookup_unknown_object(struct repository *r, const struct object_id *oid);
|
|
|
|
/*
|
|
* Dispatch to the appropriate lookup_blob(), lookup_commit(), etc, based on
|
|
* "type".
|
|
*/
|
|
struct object *lookup_object_by_type(struct repository *r, const struct object_id *oid,
|
|
enum object_type type);
|
|
|
|
struct object_list *object_list_insert(struct object *item,
|
|
struct object_list **list_p);
|
|
|
|
int object_list_contains(struct object_list *list, struct object *obj);
|
|
|
|
void object_list_free(struct object_list **list);
|
|
|
|
/* Object array handling .. */
|
|
void add_object_array(struct object *obj, const char *name, struct object_array *array);
|
|
void add_object_array_with_path(struct object *obj, const char *name, struct object_array *array, unsigned mode, const char *path);
|
|
|
|
/*
|
|
* Returns NULL if the array is empty. Otherwise, returns the last object
|
|
* after removing its entry from the array. Other resources associated
|
|
* with that object are left in an unspecified state and should not be
|
|
* examined.
|
|
*/
|
|
struct object *object_array_pop(struct object_array *array);
|
|
|
|
typedef int (*object_array_each_func_t)(struct object_array_entry *, void *);
|
|
|
|
/*
|
|
* Apply want to each entry in array, retaining only the entries for
|
|
* which the function returns true. Preserve the order of the entries
|
|
* that are retained.
|
|
*/
|
|
void object_array_filter(struct object_array *array,
|
|
object_array_each_func_t want, void *cb_data);
|
|
|
|
/*
|
|
* Remove from array all but the first entry with a given name.
|
|
* Warning: this function uses an O(N^2) algorithm.
|
|
*/
|
|
void object_array_remove_duplicates(struct object_array *array);
|
|
|
|
/*
|
|
* Remove any objects from the array, freeing all used memory; afterwards
|
|
* the array is ready to store more objects with add_object_array().
|
|
*/
|
|
void object_array_clear(struct object_array *array);
|
|
|
|
void clear_object_flags(unsigned flags);
|
|
|
|
/*
|
|
* Clear the specified object flags from all in-core commit objects from
|
|
* the specified repository.
|
|
*/
|
|
void repo_clear_commit_marks(struct repository *r, unsigned int flags);
|
|
|
|
#endif /* OBJECT_H */
|