tests: option to override default migratable version

This patch gives user an option to override the
default migratable version to any later release.
This option makes MSHV specific tests suitable for
tests since MSHV is stable after some breaking changes.
This patch is also necessary for MSHV CI.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

Author: russell-islam

scripts/dev_cli.sh

@@ -538,6 +538,7 @@ cmd_tests() {
             --env TARGET_CC="$target_cc" \
             --env AUTH_DOWNLOAD_TOKEN="$AUTH_DOWNLOAD_TOKEN" \
             --env LLVM_PROFILE_FILE="$LLVM_PROFILE_FILE" \
+            --env MIGRATABLE_VERSION="$MIGRATABLE_VERSION" \
             "$CTR_IMAGE" \
             ./scripts/run_integration_tests_live_migration.sh "$@" || fix_dir_perms $? || exit $?
     fi

scripts/run_integration_tests_live_migration.sh

@@ -11,13 +11,23 @@ mkdir -p "$WORKLOADS_DIR"
 
 process_common_args "$@"
 
+migratable_version=v39.0
 # For now these values are default for kvm
 test_features=""
 
 if [ "$hypervisor" = "mshv" ]; then
     test_features="--features mshv"
 fi
 
+# if migratable version is set to override the default
+if [ -n "${MIGRATABLE_VERSION}" ]; then
+    # validate the version if matched with vxx.0
+    if ! [[ "${MIGRATABLE_VERSION}" =~ ^v[0-9]{2,}\.[0-9]$ ]]; then
+        echo "MIGRATABLE_VERSION should be in format vxx.0, e.g. v47.0"
+        exit 1
+    fi
+    migratable_version=${MIGRATABLE_VERSION}
+fi
 cp scripts/sha1sums-x86_64 "$WORKLOADS_DIR"
 
 FOCAL_OS_IMAGE_NAME="focal-server-cloudimg-amd64-custom-20210609-0.qcow2"
@@ -45,8 +55,7 @@ fi
 popd || exit
 
 # Download Cloud Hypervisor binary from its last stable release
-LAST_RELEASE_VERSION="v39.0"
-CH_RELEASE_URL="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/download/$LAST_RELEASE_VERSION/cloud-hypervisor-static"
+CH_RELEASE_URL="https://github.com/cloud-hypervisor/cloud-hypervisor/releases/download/${migratable_version}/cloud-hypervisor-static"
 CH_RELEASE_NAME="cloud-hypervisor-static"
 pushd "$WORKLOADS_DIR" || exit
 time wget --quiet $CH_RELEASE_URL -O "$CH_RELEASE_NAME" || exit 1