Add bootstrap.sh

bootstrap.sh

+#!/bin/bash
+
+# Test environment
+if [[ ! -d /builds ]]; then
+	echo "In order to use this image, you must mount the working directory to /builds"
+	exit 1
+fi
+REFERENCE=$(ls -d /builds/* | head -1)
+if [[ -z "${REFERENCE}" ]]; then
+	echo "Aborting because of empty working directory"
+	exit 1
+fi
+
+# Prepare environment
+_builder_prepare() {
+	touch /builder/reference || exit 1
+	chown --reference "${REFERENCE}" /builder/reference || exit 1
+	chown -R builder:builder /builds/* || exit 1
+}
+
+# Terminate
+_builder_terminate() {
+	chown -R --reference /builder/reference /builds/* || exit 1
+	rm -f /builder/reference
+	exit ${1}
+}
+
+# Prepare and execute building
+_builder_prepare
+su - builder
+_builder_terminate $?