Initial draft of plugin.

entrypoint.sh

@@ -0,0 +1,87 @@
+#!/usr/bin/env bash
+set -eu;
+
+##
+## check input
+##
+
+BUILDCTL_CONTEXT=${PLUGIN_CONTEXT:-$(pwd)}
+BUILDCTL_DOCKERFILE=$(dirname "${PLUGIN_DOCKERFILE:-$BUILDCTL_CONTEXT/Dockerfile}")
+if [[ ! -f $BUILDCTL_DOCKERFILE/Dockerfile ]]; then
+	echo "Dockerfile $BUILDCTL_DOCKERFILE/Dockerfile not found!"
+	exit 1
+fi
+
+BUILDCTL_FRONTEND=${PLUGIN_FRONTEND:-dockerfile.v0}
+if [[ "$BUILDCTL_FRONTEND" != "dockerfile.v0" ]]; then
+	echo "Only frontend 'dockerfile.v0' testet and supported yet."
+	exit 1
+fi
+
+SOURCE_DATE_EPOCH=${PLUGIN_SOURCE_DATE_EPOCH:-0}
+
+if [[ -n "${PLUGIN_AUTH:-}" ]]; then
+	echo "$PLUGIN_AUTH" | jq -r 'to_entries|map({(.key):{"auth":(.value.username+":"+.value.password)|@base64}})|add|{"auths":.}' > "$HOME/.docker/config.json"
+	echo "Stored credentials at $HOME/.docker/config.json"
+	echo
+fi
+
+##
+## build command
+##
+
+COMMAND="buildctl"
+COMMAND="$COMMAND build"
+if [[ -n "${PLUGIN_ADDR:-}" ]]; then
+	COMMAND="$COMMAND --addr $PLUGIN_ADDR"
+fi
+COMMAND="$COMMAND --frontend $BUILDCTL_FRONTEND"
+COMMAND="$COMMAND --local context='$BUILDCTL_CONTEXT'"
+COMMAND="$COMMAND --local dockerfile='$BUILDCTL_DOCKERFILE'"
+if [[ -n  "${PLUGIN_PLATFORM:-}" ]]; then
+	COMMAND="$COMMAND --opt platform='$PLUGIN_PLATFORM'"
+fi
+
+# https://github.com/moby/buildkit/blob/master/README.md#output
+OUTPUT=""
+if [[ -n "${PLUGIN_NAME:-}" ]]; then
+	OUTPUT="--output type=image"
+	if [[ "$PLUGIN_NAME" =~ .*,.* ]]; then
+		# https://github.com/moby/buildkit/issues/797#issuecomment-1561601104
+		OUTPUT="$OUTPUT,\\\"name=$PLUGIN_NAME\\\""
+	else
+		OUTPUT="$OUTPUT,name=$PLUGIN_NAME"
+	fi
+	OUTPUT="$OUTPUT,push=true,oci-mediatypes=true,compression=estargz,compression-level=9"
+	OUTPUT="$OUTPUT,rewrite-timestamp=true"
+	OUTPUT="$OUTPUT$(echo "$PLUGIN_ANNOTATION" | jq --join-output 'keys[] as $k|",annotation.\($k)=\"\(.[$k])\""')"
+fi
+COMMAND="$COMMAND $OUTPUT"
+
+# custom args, e.g. docker run --rm --volume=$HOME:HOME:ro --workdir=$PWD kokuwaio/buildkit --opt buildarg=foo=bar
+if [[ -n "${1:-}" ]]; then
+	COMMAND="$COMMAND $*"
+fi
+
+##
+## execute command
+##
+
+echo
+echo Reproduce with docker:
+echo
+echo "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH docker buildx build ${PLUGIN_CONTEXT:-.}"
+	echo "  --no-cache"
+if [[ "${PLUGIN_PLATFORM:-}" == "true" ]]; then
+	echo "  --platform='$PLUGIN_PLATFORM'"
+fi
+if [[ -n "${OUTPUT:-}" ]]; then
+	echo "  $OUTPUT"
+fi
+echo
+echo Running now:
+echo
+echo -e "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH ${COMMAND// --/\\n  --}"
+echo
+
+eval "$COMMAND"