libavb: Move all A/B functionality into separate libavb_ab/ directory.
This new libavb_ab "library" depends on libavb "library" insofar that
it's using the same abstractions (system dependencies and
operations). For easy integration the newly introduced AvbABOps struct
extends the AvbOps struct so users can build just a single struct and
use that for both.
Also emphasize in README that libavb_ab usage is optional and that
it's possible to integrate libavb with another A/B stack.
(The quotes in use for "library" above is because these are not really
libraries from a system-integration perspective. That is, 3rd party is
expected to integrate this source-code with their own build-system and
toolchain.)
Since we now have multiple libraries - at least from the point of view
of how it's used in unit tests - change Android.mk such that library
users need to use libavb/libavb.h and libavb_ab/libavb_ab.h instead of
just e.g. libavb.h.
Test: Unit tests pass
Test: Tested in UEFI-based bootloader in qemu.
Test: Tested boot_control.avb.so in same UEFI-based system.
Bug: None
Change-Id: I19ea8f6bd1e63b2617b0e9fa9fc3b2a68ac4a92e
diff --git a/libavb_ab/libavb_ab.h b/libavb_ab/libavb_ab.h
new file mode 100644
index 0000000..0dcf3e9
--- /dev/null
+++ b/libavb_ab/libavb_ab.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef LIBAVB_AB_H_
+#define LIBAVB_AB_H_
+
+#include <libavb/libavb.h>
+
+/* The AVB_INSIDE_LIBAVB_AB_H preprocessor symbol is used to enforce
+ * library users to include only this file. All public interfaces, and
+ * only public interfaces, must be included here.
+ */
+
+#define AVB_INSIDE_LIBAVB_AB_H
+#include "avb_ab_flow.h"
+#include "avb_ab_ops.h"
+#undef AVB_INSIDE_LIBAVB_AB_H
+
+#endif /* LIBAVB_AB_H_ */