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, 87 insertions, 0 deletions

diff --git a/include/git2/sys/mempack.h b/include/git2/sys/mempack.h
new file mode 100644
index 0000000..17da590
--- /dev/null
+++ b/include/git2/sys/mempack.h
@@ -0,0 +1,87 @@
+/*
+ * 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_sys_git_odb_mempack_h__
+#define INCLUDE_sys_git_odb_mempack_h__
+
+#include "git2/common.h"
+#include "git2/types.h"
+#include "git2/oid.h"
+#include "git2/odb.h"
+#include "git2/buffer.h"
+
+/**
+ * @file git2/sys/mempack.h
+ * @brief Custom ODB backend that permits packing objects in-memory
+ * @defgroup git_backend Git custom backend APIs
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/**
+ * Instantiate a new mempack backend.
+ *
+ * The backend must be added to an existing ODB with the highest
+ * priority.
+ *
+ *     git_mempack_new(&mempacker);
+ *     git_repository_odb(&odb, repository);
+ *     git_odb_add_backend(odb, mempacker, 999);
+ *
+ * Once the backend has been loaded, all writes to the ODB will
+ * instead be queued in memory, and can be finalized with
+ * `git_mempack_dump`.
+ *
+ * Subsequent reads will also be served from the in-memory store
+ * to ensure consistency, until the memory store is dumped.
+ *
+ * @param out Pointer where to store the ODB backend
+ * @return 0 on success; error code otherwise
+ */
+GIT_EXTERN(int) git_mempack_new(git_odb_backend **out);
+
+/**
+ * Dump all the queued in-memory writes to a packfile.
+ *
+ * The contents of the packfile will be stored in the given buffer.
+ * It is the caller's responsibility to ensure that the generated
+ * packfile is available to the repository (e.g. by writing it
+ * to disk, or doing something crazy like distributing it across
+ * several copies of the repository over a network).
+ *
+ * Once the generated packfile is available to the repository,
+ * call `git_mempack_reset` to cleanup the memory store.
+ *
+ * Calling `git_mempack_reset` before the packfile has been
+ * written to disk will result in an inconsistent repository
+ * (the objects in the memory store won't be accessible).
+ *
+ * @param pack Buffer where to store the raw packfile
+ * @param repo The active repository where the backend is loaded
+ * @param backend The mempack backend
+ * @return 0 on success; error code otherwise
+ */
+GIT_EXTERN(int) git_mempack_dump(git_buf *pack, git_repository *repo, git_odb_backend *backend);
+
+/**
+ * Reset the memory packer by clearing all the queued objects.
+ *
+ * This assumes that `git_mempack_dump` has been called before to
+ * store all the queued objects into a single packfile.
+ *
+ * Alternatively, call `reset` without a previous dump to "undo"
+ * all the recently written objects, giving transaction-like
+ * semantics to the Git repository.
+ *
+ * @param backend The mempack backend
+ * @return 0 on success; error code otherwise
+ */
+GIT_EXTERN(int) git_mempack_reset(git_odb_backend *backend);
+
+GIT_END_DECL
+
+#endif