bundles: add oniro-bundle-base

The oniro-bundle-base recipe creates a RAUC update bundle corresponding
to oniro-image-base. At the moment the recipe is only compatible with
Raspberry Pi 4.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

meta-oniro-core/recipes-core/bundles/oniro-bundle-base.bb

+# SPDX-FileCopyrightText: Huawei Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+inherit bundle
+
+SUMMARY = "SysOTA/RAUC Update Bundle for Oniro Base Image"
+
+RAUC_BUNDLE_COMPATIBLE:raspberrypi4-64 = "Raspberry Pi 4"
+# TODO: add compatibility strings for other machines.
+
+RAUC_BUNDLE_DESCRIPTION = "SysOTA/RAUC Update Bundle"
+
+RAUC_BUNDLE_SLOTS = "system"
+RAUC_BUNDLE_FORMAT = "verity"
+
+RAUC_SLOT_system = "oniro-image-base"
+RAUC_SLOT_system[type] = "image"
+RAUC_SLOT_system[fstype] = "squashfs"
+
+# There are two squashfs filesystems used, one to contain the bundle and one to
+# contain the system image inside the bundle. The outer squashfs should not use
+# any strong compression as it is effectively pointless. Since there is no
+# option to avoid compression completely, use the weakest/fastest compression
+# available.
+BUNDLE_ARGS += ' --mksquashfs-args="-comp zstd -Xcompression-level 1" '
+
+# Those need to be synchronized with the keys used by RAUC.
+RAUC_KEY_FILE ?= "${THISDIR}/../rauc/insecure-keys/key.pem"
+RAUC_CERT_FILE ?= "${THISDIR}/../rauc/insecure-keys/cert.pem"