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

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#!/bin/bash
set -e
# Retrieve OS/ARCH of docker daemon, eg. linux/amd64
export DOCKER_ENGINE_OSARCH="$(docker version |tac|tac| awk '
$1 == "Client:" { server = 0; next }
$1 == "Server:" { server = 1; next }
server && $1 == "OS/Arch:" { print $2; exit }
')"
export DOCKER_ENGINE_GOOS="${DOCKER_ENGINE_OSARCH%/*}"
export DOCKER_ENGINE_GOARCH="${DOCKER_ENGINE_OSARCH##*/}"
# and the client, just in case
export DOCKER_CLIENT_OSARCH="$(docker version |tac|tac| awk '
$1 == "Client:" { client = 1; next }
$1 == "Server:" { client = 0; next }
client && $1 == "OS/Arch:" { print $2; exit }
')"