Adding upstream version 1.7.2+ds.upstream/1.7.2+ds

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 223 insertions, 0 deletions

diff --git a/include/git2/odb_backend.h b/include/git2/odb_backend.h
new file mode 100644
index 0000000..12dd0fd
--- /dev/null
+++ b/include/git2/odb_backend.h
@@ -0,0 +1,223 @@
+/*
+ * 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.
+ */
+
+/** Options for configuring a packfile object backend. */
+typedef struct {
+	unsigned int version; /**< version for the struct */
+
+	/**
+	 * Type of object IDs to use for this object database, or
+	 * 0 for default (currently SHA1).
+	 */
+	git_oid_t oid_type;
+} git_odb_backend_pack_options;
+
+/* The current version of the diff options structure */
+#define GIT_ODB_BACKEND_PACK_OPTIONS_VERSION 1
+
+/* Stack initializer for odb pack backend options.  Alternatively use
+ * `git_odb_backend_pack_options_init` programmatic initialization.
+ */
+#define GIT_ODB_BACKEND_PACK_OPTIONS_INIT \
+	{ GIT_ODB_BACKEND_PACK_OPTIONS_VERSION }
+
+/**
+ * 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
+ */
+#ifdef GIT_EXPERIMENTAL_SHA256
+GIT_EXTERN(int) git_odb_backend_pack(
+	git_odb_backend **out,
+	const char *objects_dir,
+	const git_odb_backend_pack_options *opts);
+#else
+GIT_EXTERN(int) git_odb_backend_pack(
+	git_odb_backend **out,
+	const char *objects_dir);
+#endif
+
+/**
+ * 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
+ */
+#ifdef GIT_EXPERIMENTAL_SHA256
+GIT_EXTERN(int) git_odb_backend_one_pack(
+	git_odb_backend **out,
+	const char *index_file,
+	const git_odb_backend_pack_options *opts);
+#else
+GIT_EXTERN(int) git_odb_backend_one_pack(
+	git_odb_backend **out,
+	const char *index_file);
+#endif
+
+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
+ */
+#ifdef GIT_EXPERIMENTAL_SHA256
+GIT_EXTERN(int) git_odb_backend_loose(
+	git_odb_backend **out,
+	const char *objects_dir,
+	git_odb_backend_loose_options *opts);
+#else
+GIT_EXTERN(int) git_odb_backend_loose(
+	git_odb_backend **out,
+	const char *objects_dir,
+	int compression_level,
+	int do_fsync,
+	unsigned int dir_mode,
+	unsigned int file_mode);
+#endif
+
+/** 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;
+
+#ifdef GIT_EXPERIMENTAL_SHA256
+	git_oid_t oid_type;
+#endif
+
+	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