moby--moby/hack/make/.detect-daemon-osarch

#!/bin/bash
set -e

# Retrieve OS/ARCH of docker daemon, eg. linux/amd64
export DOCKER_ENGINE_OSARCH="$(docker version | awk '
	$1 == "Client:" { server = 0; next }
	$1 == "Server:" { server = 1; next }
	server && $1 == "OS/Arch:" { print $2 }
')"
export DOCKER_ENGINE_GOOS="${DOCKER_ENGINE_OSARCH%/*}"
export DOCKER_ENGINE_GOARCH="${DOCKER_ENGINE_OSARCH##*/}"
DOCKER_ENGINE_GOARCH=${DOCKER_ENGINE_GOARCH:=amd64}

# and the client, just in case
export DOCKER_CLIENT_OSARCH="$(docker version | awk '
	$1 == "Client:" { client = 1; next }
	$1 == "Server:" { client = 0; next }
	client && $1 == "OS/Arch:" { print $2 }
')"

# Retrieve the architecture used in contrib/builder/(deb|rpm)/$PACKAGE_ARCH/
PACKAGE_ARCH="amd64"
case "$DOCKER_ENGINE_OSARCH" in
	linux/arm)
		PACKAGE_ARCH='armhf'
		;;
	linux/ppc64le)
		PACKAGE_ARCH='ppc64le'
		;;
	linux/s390x)
		PACKAGE_ARCH='s390x'
		;;
esac
export PACKAGE_ARCH