Build the docker cli for unreleased platforms

Signed-off-by: Daniel Nephin <dnephin@docker.com>

hack/dockerfile/install-binaries.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 set -e
 set -x
 
@@ -52,7 +52,12 @@ install_dockercli() {
 	echo "Install docker/cli version $DOCKERCLI_VERSION from $DOCKERCLI_CHANNEL"
 
 	arch=$(uname -m)
-	echo "Docker CLI ARCH $arch"
+	# No official release of these platforms
+	if [[ "$arch" != "x86_64" ]] && [[ "$arch" != "s390x" ]]; then
+		build_dockercli
+		return
+	fi
+
 	url=https://download.docker.com/linux/static
 	curl -Ls $url/$DOCKERCLI_CHANNEL/$arch/docker-$DOCKERCLI_VERSION.tgz | \
 	tar -xz docker/docker
@@ -60,6 +65,16 @@ install_dockercli() {
 	rmdir docker
 }
 
+build_dockercli() {
+	DOCKERCLI_VERSION=${DOCKERCLI_VERSION:-17.06.0-ce}
+	git clone https://github.com/docker/docker-ce "$GOPATH/tmp/docker-ce"
+	cd "$GOPATH/tmp/docker-ce"
+	git checkout -q "v$DOCKERCLI_VERSION"
+	mkdir -p "$GOPATH/src/github.com/docker"
+	mv components/cli "$GOPATH/src/github.com/docker/cli"
+	go build -o /usr/local/bin/docker github.com/docker/cli/cmd/docker
+}
+
 install_gometalinter() {
 	echo "Installing gometalinter version $GOMETALINTER_COMMIT"
 	go get -d github.com/alecthomas/gometalinter