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git.proxmox.com Git - libgit2.git/blob - include/git2/object.h
2 * Copyright (C) the libgit2 contributors. All rights reserved.
4 * This file is part of libgit2, distributed under the GNU GPL v2 with
5 * a Linking Exception. For full terms see the included COPYING file.
7 #ifndef INCLUDE_git_object_h__
8 #define INCLUDE_git_object_h__
17 * @brief Git revision object management routines
18 * @defgroup git_object Git revision object management routines
25 * Lookup a reference to one of the objects in a repository.
27 * The generated reference is owned by the repository and
28 * should be closed with the `git_object_free` method
29 * instead of free'd manually.
31 * The 'type' parameter must match the type of the object
32 * in the odb; the method will fail otherwise.
33 * The special value 'GIT_OBJ_ANY' may be passed to let
34 * the method guess the object's type.
36 * @param object pointer to the looked-up object
37 * @param repo the repository to look up the object
38 * @param id the unique identifier for the object
39 * @param type the type of the object
40 * @return 0 or an error code
42 GIT_EXTERN(int) git_object_lookup(
49 * Lookup a reference to one of the objects in a repository,
50 * given a prefix of its identifier (short id).
52 * The object obtained will be so that its identifier
53 * matches the first 'len' hexadecimal characters
54 * (packets of 4 bits) of the given 'id'.
55 * 'len' must be at least GIT_OID_MINPREFIXLEN, and
56 * long enough to identify a unique object matching
57 * the prefix; otherwise the method will fail.
59 * The generated reference is owned by the repository and
60 * should be closed with the `git_object_free` method
61 * instead of free'd manually.
63 * The 'type' parameter must match the type of the object
64 * in the odb; the method will fail otherwise.
65 * The special value 'GIT_OBJ_ANY' may be passed to let
66 * the method guess the object's type.
68 * @param object_out pointer where to store the looked-up object
69 * @param repo the repository to look up the object
70 * @param id a short identifier for the object
71 * @param len the length of the short identifier
72 * @param type the type of the object
73 * @return 0 or an error code
75 GIT_EXTERN(int) git_object_lookup_prefix(
76 git_object
**object_out
,
84 * Lookup an object that represents a tree entry.
86 * @param out buffer that receives a pointer to the object (which must be freed
88 * @param treeish root object that can be peeled to a tree
89 * @param path relative path from the root object to the desired object
90 * @param type type of object desired
91 * @return 0 on success, or an error code
93 GIT_EXTERN(int) git_object_lookup_bypath(
95 const git_object
*treeish
,
100 * Get the id (SHA1) of a repository object
102 * @param obj the repository object
103 * @return the SHA1 id
105 GIT_EXTERN(const git_oid
*) git_object_id(const git_object
*obj
);
108 * Get a short abbreviated OID string for the object
110 * @param out Buffer to write string into
111 * @param obj The object to get an ID for
112 * @return 0 on success, <0 for error
114 GIT_EXTERN(int) git_object_short_id(git_buf
*out
, const git_object
*obj
);
117 * Get the object type of an object
119 * @param obj the repository object
120 * @return the object's type
122 GIT_EXTERN(git_otype
) git_object_type(const git_object
*obj
);
125 * Get the repository that owns this object
127 * Freeing or calling `git_repository_close` on the
128 * returned pointer will invalidate the actual object.
130 * Any other operation may be run on the repository without
131 * affecting the object.
133 * @param obj the object
134 * @return the repository who owns this object
136 GIT_EXTERN(git_repository
*) git_object_owner(const git_object
*obj
);
139 * Close an open object
141 * This method instructs the library to close an existing
142 * object; note that git_objects are owned and cached by the repository
143 * so the object may or may not be freed after this library call,
144 * depending on how aggressive is the caching mechanism used
148 * It *is* necessary to call this method when you stop using
149 * an object. Failure to do so will cause a memory leak.
151 * @param object the object to close
153 GIT_EXTERN(void) git_object_free(git_object
*object
);
156 * Convert an object type to it's string representation.
158 * The result is a pointer to a string in static memory and
159 * should not be free()'ed.
161 * @param type object type to convert.
162 * @return the corresponding string representation.
164 GIT_EXTERN(const char *) git_object_type2string(git_otype type
);
167 * Convert a string object type representation to it's git_otype.
169 * @param str the string to convert.
170 * @return the corresponding git_otype.
172 GIT_EXTERN(git_otype
) git_object_string2type(const char *str
);
175 * Determine if the given git_otype is a valid loose object type.
177 * @param type object type to test.
178 * @return true if the type represents a valid loose object type,
181 GIT_EXTERN(int) git_object_typeisloose(git_otype type
);
184 * Get the size in bytes for the structure which
185 * acts as an in-memory representation of any given
188 * For all the core types, this would the equivalent
189 * of calling `sizeof(git_commit)` if the core types
190 * were not opaque on the external API.
192 * @param type object type to get its size
193 * @return size in bytes of the object
195 GIT_EXTERN(size_t) git_object__size(git_otype type
);
198 * Recursively peel an object until an object of the specified type is met.
200 * The retrieved `peeled` object is owned by the repository and should be
201 * closed with the `git_object_free` method.
203 * If you pass `GIT_OBJ_ANY` as the target type, then the object will be
204 * peeled until the type changes (e.g. a tag will be chased until the
205 * referenced object is no longer a tag).
207 * @param peeled Pointer to the peeled git_object
208 * @param object The object to be processed
209 * @param target_type The type of the requested object (GIT_OBJ_COMMIT,
210 * GIT_OBJ_TAG, GIT_OBJ_TREE, GIT_OBJ_BLOB or GIT_OBJ_ANY).
211 * @return 0 on success, GIT_EAMBIGUOUS, GIT_ENOTFOUND or an error code
213 GIT_EXTERN(int) git_object_peel(
215 const git_object
*object
,
216 git_otype target_type
);
219 * Create an in-memory copy of a Git object. The copy must be
220 * explicitly free'd or it will leak.
222 * @param dest Pointer to store the copy of the object
223 * @param source Original object to copy
225 GIT_EXTERN(int) git_object_dup(git_object
**dest
, git_object
*source
);