tools: Add a generate_vendor.sh script

This script is responsible for generating a tarball with all the rust
vendored code that is needed for fully building kata-containers on a
disconnected environment.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tools/packaging/release/generate_vendor.sh

@@ -0,0 +1,53 @@
+#!/usr/bin/env bash
+#
+# Copyright (c) 2022 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+script_name="$(basename "${BASH_SOURCE[0]}")"
+
+# This is very much error prone in case we re-structure our
+# repos again, but it's also used in a few other places :-/
+repo_dir="${script_dir}/../../.."
+
+function usage() {
+
+	cat <<EOF
+Usage: ${script_name} tarball-name
+This script creates a tarball with all the cargo vendored code
+that a distro would need to do a full build of the project in
+a disconnected environment, generating a "tarball-name" file.
+
+EOF
+
+}
+
+create_vendor_tarball() {
+	vendor_dir_list=""
+	pushd ${repo_dir}
+		for i in $(find . -name 'Cargo.lock'); do
+			dir="$(dirname $i)"
+			pushd "${dir}"
+				[ -d .cargo ] || mkdir .cargo
+				cargo vendor >> .cargo/config
+				vendor_dir_list+=" $dir/vendor $dir/.cargo/config"
+				echo "${vendor_dir_list}"
+			popd
+		done
+	popd
+	
+	tar -cvzf ${1} ${vendor_dir_list}
+}
+
+main () {
+	[ $# -ne 1 ] && usage && exit 0
+	create_vendor_tarball ${1}
+}
+
+main "$@"