tests: Move install_rust.sh from the tests repo

We'll use it as part of the refactoring we're doing in the static check
tests.

I can see a lot of other uses of this, but changing all of them to this
one is out of the scope for this PR.

Fixes: #7974 -- part 0

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

tests/install_rust.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+#
+# Copyright (c) 2019 Ant Financial
+#
+# 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 "${BASH_SOURCE[0]}")"
+
+source "${script_dir}/common.bash"
+
+rustarch=$(arch_to_rust)
+
+version="${1:-""}"
+if [ -z "${version}" ]; then
+	version=$(get_from_kata_deps "languages.rust.meta.newest-version")
+fi
+
+echo "Install rust ${version}"
+
+if ! command -v rustup > /dev/null; then
+	curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${version}
+fi
+
+export PATH="${PATH}:${HOME}/.cargo/bin"
+
+## Still try to install the target version of toolchain,
+## in case that the rustup has been installed but
+## with a different version toolchain.
+## Even though the target version toolchain has been installed,
+## this command will not take too long to run.
+rustup toolchain install ${version}
+rustup default ${version}
+if [ "${rustarch}" == "powerpc64le" ] || [ "${rustarch}" == "s390x" ] ; then
+	rustup target add ${rustarch}-unknown-linux-gnu
+else
+	rustup target add ${rustarch}-unknown-linux-musl
+	$([ "$(whoami)" != "root" ] && echo sudo) ln -sf /usr/bin/g++ /bin/musl-g++
+fi
+rustup component add rustfmt