hack/ensure-kind.sh
#!/usr/bin/env bash

# Copyright 2019 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

set -o errexit
set -o nounset
set -o pipefail

if [[ "${TRACE-0}" == "1" ]]; then
    set -o xtrace
fi

GOPATH_BIN="$(go env GOPATH)/bin"
MINIMUM_KIND_VERSION=v0.20.0
goarch="$(go env GOARCH)"
goos="$(go env GOOS)"

# Ensure the kind tool exists and is a viable version, or installs it
verify_kind_version()
{
    # If kind is not available on the path, get it
    if ! [ -x "$(command -v kind)" ]; then
        if [ "${goos}" == "linux" ] || [ "${goos}" == "darwin" ]; then
            echo 'kind not found, installing'
            if ! [ -d "${GOPATH_BIN}" ]; then
                mkdir -p "${GOPATH_BIN}"
            fi
            curl -sLo "${GOPATH_BIN}/kind" "https://github.com/kubernetes-sigs/kind/releases/download/${MINIMUM_KIND_VERSION}/kind-${goos}-${goarch}"
            chmod +x "${GOPATH_BIN}/kind"
        else
            echo "Missing required binary in path: kind"
            return 2
        fi
    fi

    local kind_version
    if [ -x "$(command -v kind)" ]; then
        kind_version="v$(kind version -q)"
    else
        echo "warning: GOPATH_BIN=${GOPATH_BIN} not in your path"
        kind_version="v$("${GOPATH_BIN}"/kind version -q)"
    fi

    if [[ "${MINIMUM_KIND_VERSION}" != $(echo -e "${MINIMUM_KIND_VERSION}\n${kind_version}" | sort -s -t. -k 1,1n -k 2,2n -k 3,3n | head -n1) ]]; then
        cat << EOF
Detected kind version: ${kind_version}.
Requires ${MINIMUM_KIND_VERSION} or greater.
Please install ${MINIMUM_KIND_VERSION} or later.
EOF
        return 2
    fi
}

verify_kind_version
