#!/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 go.mod

buildkit_ref=$(go list -mod=mod -u -m -f '{{if .Replace}}{{.Replace.Version}}{{else}}{{.Version}}{{end}}' "$buildkit_pkg")

buildkit_repo=$(go list -mod=mod -u -m -f '{{if .Replace}}{{.Replace.Path}}{{else}}{{.Path}}{{end}}' "$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

# Needed by v0.25.0-rc1

buildkit_ref="e4d7acb44d7e29b594445a36c5cc28be44740142"

cat << EOF

BUILDKIT_REPO=$buildkit_repo

BUILDKIT_REF=$buildkit_ref

EOF