bash: squash some shellcheck warnings

- dead code for `kernel_id_to_use` (we're using USE_KERNEL_ID directly)
- quoting for the `USE_LATEST_BUILT_KERNEL` case

Signed-off-by: Ricardo Pardini <[email protected]>

Author: rpardini

bash/kernel.sh

@@ -60,8 +60,8 @@ function resolve_latest_kernel_version_lts() { # Produces KERNEL_POINT_RELEASE
 	# HookOS using an existing kernel container image from the registry. This only works with
 	# unauthenticated registries.
 	if [[ -n "${USE_LATEST_BUILT_KERNEL}" ]]; then
-		reg="$(echo ${HOOK_KERNEL_OCI_BASE} | cut -d'/' -f1)"
-		repo="$(echo ${HOOK_KERNEL_OCI_BASE} | cut -d'/' -f2-)"
+		reg="$(echo "${HOOK_KERNEL_OCI_BASE}" | cut -d'/' -f1)"
+		repo="$(echo "${HOOK_KERNEL_OCI_BASE}" | cut -d'/' -f2-)"
 		# expected format is: 6.6.32-14b8be17 (major.minor.point-hash)
 		latest_point_release="$(curl -sL "https://${reg}/v2/${repo}/tags/list" | jq -r ".tags[]" | grep -e "^${KERNEL_MAJOR}.${KERNEL_MINOR}" | sort -V | tail -n1 | cut -d"-" -f1 | cut -d"." -f3)"
 		log info "Using latest point release from registry ${HOOK_KERNEL_OCI_BASE} for kernel ${KERNEL_MAJOR}.${KERNEL_MINOR}: ${latest_point_release}"

bash/kernel/kernel_default.sh

@@ -55,13 +55,6 @@ function calculate_kernel_version_default() {
 	input_hash="$(cat "kernel/configs/${INPUT_DEFCONFIG}" "kernel/Dockerfile" | sha256sum - | cut -d ' ' -f 1)"
 	short_input_hash="${input_hash:0:8}"
 	kernel_oci_version="${KERNEL_MAJOR}.${KERNEL_MINOR}.${KERNEL_POINT_RELEASE}-${short_input_hash}"
-
-	kernel_id_to_use="${inventory_id}"
-	if [[ -n "${USE_KERNEL_ID}" ]]; then
-		log warn "USE_KERNEL_ID is set to '${USE_KERNEL_ID}'; using it instead of the default inventory_id '${inventory_id}'."
-		kernel_id_to_use="${USE_KERNEL_ID}"
-	fi
-
 	kernel_oci_image="${HOOK_KERNEL_OCI_BASE}:${kernel_oci_version}"
 
 	# Log the obtained version & images to stderr