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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#ifndef INCLUDE_git_odb_backend_h__
#define INCLUDE_git_odb_backend_h__
#include "common.h"
#include "types.h"
#include "indexer.h"
/**
* @file git2/backend.h
* @brief Git custom backend functions
* @defgroup git_odb Git object database routines
* @ingroup Git
* @{
*/
GIT_BEGIN_DECL
/*
* Constructors for in-box ODB backends.
*/
/**
* Create a backend for the packfiles.
*
* @param out location to store the odb backend pointer
* @param objects_dir the Git repository's objects directory
*
* @return 0 or an error code
*/
GIT_EXTERN(int) git_odb_backend_pack(git_odb_backend **out, const char *objects_dir);
typedef enum {
GIT_ODB_BACKEND_LOOSE_FSYNC = (1 << 0)
} git_odb_backend_loose_flag_t;
/** Options for configuring a loose object backend. */
typedef struct {
unsigned int version; /**< version for the struct */
/** A combination of the `git_odb_backend_loose_flag_t` types. */
uint32_t flags;
/**
* zlib compression level to use (0-9), where 1 is the fastest
* at the expense of larger files, and 9 produces the best
* compression at the expense of speed. 0 indicates that no
* compression should be performed. -1 is the default (currently
* optimizing for speed).
*/
int compression_level;
/** Permissions to use creating a directory or 0 for defaults */
unsigned int dir_mode;
/** Permissions to use creating a file or 0 for defaults */
unsigned int file_mode;
/**
* Type of object IDs to use for this object database, or
* 0 for default (currently SHA1).
*/
git_oid_t oid_type;
} git_odb_backend_loose_options;
/* The current version of the diff options structure */
#define GIT_ODB_BACKEND_LOOSE_OPTIONS_VERSION 1
/* Stack initializer for odb loose backend options. Alternatively use
* `git_odb_backend_loose_options_init` programmatic initialization.
*/
#define GIT_ODB_BACKEND_LOOSE_OPTIONS_INIT \
{ GIT_ODB_BACKEND_LOOSE_OPTIONS_VERSION, 0, -1 }
/**
* Create a backend for loose objects
*
* @param out location to store the odb backend pointer
* @param objects_dir the Git repository's objects directory
* @param opts options for the loose object backend or NULL
*
* @return 0 or an error code
*/
GIT_EXTERN(int) git_odb_backend_loose(
git_odb_backend **out,
const char *objects_dir,
git_odb_backend_loose_options *opts);
/**
* Create a backend out of a single packfile
*
* This can be useful for inspecting the contents of a single
* packfile.
*
* @param out location to store the odb backend pointer
* @param index_file path to the packfile's .idx file
*
* @return 0 or an error code
*/
GIT_EXTERN(int) git_odb_backend_one_pack(git_odb_backend **out, const char *index_file);
/** Streaming mode */
typedef enum {
GIT_STREAM_RDONLY = (1 << 1),
GIT_STREAM_WRONLY = (1 << 2),
GIT_STREAM_RW = (GIT_STREAM_RDONLY | GIT_STREAM_WRONLY)
} git_odb_stream_t;
/**
* A stream to read/write from a backend.
*
* This represents a stream of data being written to or read from a
* backend. When writing, the frontend functions take care of
* calculating the object's id and all `finalize_write` needs to do is
* store the object with the id it is passed.
*/
struct git_odb_stream {
git_odb_backend *backend;
unsigned int mode;
void *hash_ctx;
git_oid_t oid_type;
git_object_size_t declared_size;
git_object_size_t received_bytes;
/**
* Write at most `len` bytes into `buffer` and advance the stream.
*/
int GIT_CALLBACK(read)(git_odb_stream *stream, char *buffer, size_t len);
/**
* Write `len` bytes from `buffer` into the stream.
*/
int GIT_CALLBACK(write)(git_odb_stream *stream, const char *buffer, size_t len);
/**
* Store the contents of the stream as an object with the id
* specified in `oid`.
*
* This method might not be invoked if:
* - an error occurs earlier with the `write` callback,
* - the object referred to by `oid` already exists in any backend, or
* - the final number of received bytes differs from the size declared
* with `git_odb_open_wstream()`
*/
int GIT_CALLBACK(finalize_write)(git_odb_stream *stream, const git_oid *oid);
/**
* Free the stream's memory.
*
* This method might be called without a call to `finalize_write` if
* an error occurs or if the object is already present in the ODB.
*/
void GIT_CALLBACK(free)(git_odb_stream *stream);
};
/** A stream to write a pack file to the ODB */
struct git_odb_writepack {
git_odb_backend *backend;
int GIT_CALLBACK(append)(git_odb_writepack *writepack, const void *data, size_t size, git_indexer_progress *stats);
int GIT_CALLBACK(commit)(git_odb_writepack *writepack, git_indexer_progress *stats);
void GIT_CALLBACK(free)(git_odb_writepack *writepack);
};
GIT_END_DECL
#endif
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