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#!/bin/bash | ||
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# Copyright 2023 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. | ||
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# There is no reliable way to check if a buildx installation supports | ||
# --provenance other than trying to execute it. You cannot even rely | ||
# on the version, because buildx's own installation docs will result | ||
# in installations of buildx that do not correctly report their version | ||
# via `docker buildx version`. | ||
# | ||
# Additionally, if the local buildkit worker is the Docker daemon, | ||
# attestation should not be supported and must be disabled. | ||
# | ||
# Thus, this script echos back the flag `--provenance=false` if and only | ||
# if the local buildx installation supports it. If not, it exits silently. | ||
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BUILDX_TEST=`docker buildx build --provenance=false 2>&1` | ||
if [[ "${BUILDX_TEST}" == *"See 'docker buildx build --help'."* ]]; then | ||
if [[ "${BUILDX_TEST}" == *"requires exactly 1 argument"* ]] && ! docker buildx inspect | grep -qE "^Driver:\s*docker$"; then | ||
echo "--provenance=false" | ||
fi | ||
else | ||
echo "Local buildx installation broken?" >&2 | ||
exit 1 | ||
fi |