File: buildkit-ref

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#!/usr/bin/env bash
# This script returns the current BuildKit ref and source repository being used.
# This script will only work with a BuildKit repository hosted on GitHub.
#
# The output of this script may be valid shell script, but is intended for use with
# GitHub Actions' $GITHUB_ENV.

buildkit_pkg=github.com/moby/buildkit

# get buildkit version from vendor.mod
buildkit_ref=$(./hack/with-go-mod.sh go list -mod=mod -modfile=vendor.mod -u -m -f '{{if .Replace}}{{.Replace.Version}}{{else}}{{.Version}}{{end}}' "$buildkit_pkg")
buildkit_repo=$(./hack/with-go-mod.sh go list -mod=mod -modfile=vendor.mod -u -m -f '{{if .Replace}}{{.Replace.Path}}{{else}}{{.Path}}{{end}}' "$buildkit_pkg")
buildkit_repo=${buildkit_repo#github.com/}

if [[ "${buildkit_ref}" == *-*-* ]]; then
	# if pseudo-version, figure out just the uncommon sha (https://github.com/golang/go/issues/34745)
	buildkit_ref=$(awk -F"-" '{print $NF}' <<< "$buildkit_ref" | awk 'BEGIN{FIELDWIDTHS="7"} {print $1}')
	# use github api to return full sha to be able to use it as ref
	buildkit_ref=$(curl -s "https://api.github.com/repos/${buildkit_repo}/commits/${buildkit_ref}" | jq -r .sha)
fi

cat << EOF
BUILDKIT_REPO=$buildkit_repo
BUILDKIT_REF=$buildkit_ref
EOF