tools: Add support for caching Kernel artefacts

Let's add support for caching Kernel artefacts that are generated using
the kata-deploy local-build scripts.

Right now those are not used, but we'll switch to using them very soon
as part of upcoming changes of how we build the components we test in
our CI.

Fixes: #6480

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>
Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>

tools/packaging/kernel/kata_config_version

@@ -1 +1 @@
-101
+102

tools/packaging/scripts/lib.sh

@@ -129,3 +129,8 @@ push_to_registry() {
 		fi
 	fi
 }
+
+get_kernel_image_name() {
+	kernel_script_dir="${repo_root_dir}/tools/packaging/static-build/kernel"
+	echo "${BUILDER_REGISTRY}:kernel-$(get_last_modification ${kernel_script_dir})-$(uname -m)"
+}

tools/packaging/static-build/cache_components_main.sh

@@ -12,6 +12,8 @@ script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 
 source "${script_dir}/../scripts/lib.sh"
 
+KERNEL_FLAVOUR="${KERNEL_FLAVOUR:-kernel}" # kernel | kernel-experimental | kernel-arm-experimetnal | kernel-dragonball-experimental
+
 cache_clh_artifacts() {
 	local clh_tarball_name="kata-static-cloud-hypervisor.tar.xz"
 	local current_clh_version="$(get_from_kata_deps "assets.hypervisor.cloud_hypervisor.version")"
@@ -24,6 +26,14 @@ cache_firecracker_artifacts() {
 	create_cache_asset "${fc_tarball_name}" "${current_fc_version}" ""
 }
 
+cache_kernel_artifacts() {
+	local kernel_tarball_name="kata-static-${KERNEL_FLAVOUR}.tar.xz"
+	local current_kernel_image="$(get_kernel_image_name)"
+	local current_kernel_kata_config_version="$(cat ${repo_root_dir}/tools/packaging/kernel/kata_config_version)"
+	local current_kernel_version="$(get_from_kata_deps "assets.${KERNEL_FLAVOUR}.version")-${current_kernel_kata_config_version}"
+	create_cache_asset "${kernel_tarball_name}" "${current_kernel_version}" "${current_kernel_image}"
+}
+
 create_cache_asset() {
 	local component_name="${1}"
 	local component_version="${2}"
@@ -47,6 +57,9 @@ Usage: $0 "[options]"
 	Options:
 		-c	Cloud hypervisor cache
 		-F	Firecracker cache
+		-k	Kernel cache
+			* Export KERNEL_FLAVOUR="kernel|kernek-experimental|kernel-arm-experimental|kernel-dragonball-experimental" for a specific build
+			  The default KERNEL_FLAVOUR value is "kernel"
 		-h	Shows help
 EOF
 )"
@@ -55,8 +68,9 @@ EOF
 main() {
 	local cloud_hypervisor_component="${cloud_hypervisor_component:-}"
 	local firecracker_component="${firecracker_component:-}"
+	local kernel_component="${kernel_component:-}"
 	local OPTIND
-	while getopts ":cFh:" opt
+	while getopts ":cFkh:" opt
 	do
 		case "$opt" in
 		c)
@@ -65,6 +79,9 @@ main() {
 		F)
 			firecracker_component="1"
 			;;
+		k)
+			kernel_component="1"
+			;;
 		h)
 			help
 			exit 0;
@@ -80,6 +97,7 @@ main() {
 
 	[[ -z "${cloud_hypervisor_component}" ]] && \
 	[[ -z "${firecracker_component}" ]] && \
+	[[ -z "${kernel_component}" ]] && \
 		help && die "Must choose at least one option"
 
 	mkdir -p "${WORKSPACE}/artifacts"
@@ -88,6 +106,7 @@ main() {
 
 	[ "${cloud_hypervisor_component}" == "1" ] && cache_clh_artifacts
 	[ "${firecracker_component}" == "1" ] && cache_firecracker_artifacts
+	[ "${kernel_component}" == "1" ] && cache_kernel_artifacts
 
 	ls -la "${WORKSPACE}/artifacts/"
 	popd

tools/packaging/static-build/kernel/build.sh

@@ -16,7 +16,7 @@ readonly kernel_builder="${repo_root_dir}/tools/packaging/kernel/build-kernel.sh
 
 DESTDIR=${DESTDIR:-${PWD}}
 PREFIX=${PREFIX:-/opt/kata}
-container_image="${KERNEL_CONTAINER_BUILDER:-${BUILDER_REGISTRY}:kernel-$(get_last_modification ${script_dir})-$(uname -m)}"
+container_image="${KERNEL_CONTAINER_BUILDER:-$(get_kernel_image_name)}"
 
 sudo docker pull ${container_image} || \
 	(sudo docker build -t "${container_image}" "${script_dir}" && \