moby--moby/hack/make/.ensure-syscall-test

#!/bin/bash
set -e

# Build a C binary for cloning a userns for seccomp tests
# and compile it for target daemon
if [ "$DOCKER_ENGINE_GOOS" = "linux" ]; then
	if [ "$DOCKER_ENGINE_OSARCH" = "$DOCKER_CLIENT_OSARCH" ]; then
		tmpdir=$(mktemp -d)
		gcc -g -Wall -static contrib/syscall-test/userns.c -o "${tmpdir}/userns-test"
		gcc -g -Wall -static contrib/syscall-test/ns.c -o "${tmpdir}/ns-test"
		gcc -g -Wall -static contrib/syscall-test/acct.c -o "${tmpdir}/acct-test"

		dockerfile="${tmpdir}/Dockerfile"
		cat <<-EOF > "$dockerfile"
		FROM debian:jessie
		COPY . /usr/bin/
		EOF
		docker build --force-rm ${DOCKER_BUILD_ARGS} -qt syscall-test "${tmpdir}" > /dev/null
		rm -rf "${tmpdir}"
	else
		docker build ${DOCKER_BUILD_ARGS} -qt syscall-test contrib/syscall-test > /dev/null
	fi
fi