static: skip packaging if platform not supported

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

Author: crazy-max

static/build-static

@@ -170,79 +170,77 @@ esac
 
 # docker CLI
 mkdir -p "${dockerCLIBuildDir}"
-case ${TARGETOS} in
-	linux | darwin)
-		cp "${CLI_DIR}"/build/"${targetPair}"/docker-"${TARGETOS}"-* "${dockerCLIBuildDir}/docker"
-		;;
-	windows)
-		cp "${CLI_DIR}"/build/"${targetPair}"/docker-"${TARGETOS}"-*.exe "${dockerCLIBuildDir}/docker.exe"
-		;;
-esac
-# package docker CLI
-case ${TARGETOS} in
-	linux | darwin)
-		(
-			set -x
-			tar -C "${buildDir}" -c -z -f "${buildDir}/docker-cli-${GEN_STATIC_VER}.tgz" docker-cli
-		)
-		;;
-	windows)
-		(
-			cd "${buildDir}"
-			set -x
-			zip -r "docker-cli-${GEN_STATIC_VER}.zip" docker-cli
-		)
-		;;
-esac
+if [ -d "${CLI_DIR}/build" ]; then
+	case ${TARGETOS} in
+		linux | darwin)
+			cp "${CLI_DIR}"/build/"${targetPair}"/docker-"${TARGETOS}"-* "${dockerCLIBuildDir}/docker"
+			;;
+		windows)
+			cp "${CLI_DIR}"/build/"${targetPair}"/docker-"${TARGETOS}"-*.exe "${dockerCLIBuildDir}/docker.exe"
+			;;
+	esac
+	# package docker CLI
+	case ${TARGETOS} in
+		linux | darwin)
+			(
+				set -x
+				tar -C "${buildDir}" -c -z -f "${buildDir}/docker-cli-${GEN_STATIC_VER}.tgz" docker-cli
+			)
+			;;
+		windows)
+			(
+				cd "${buildDir}"
+				set -x
+				zip -r "docker-cli-${GEN_STATIC_VER}.zip" docker-cli
+			)
+			;;
+	esac
+fi
 
 # docker, containerd, and runc
 mkdir -p "${dockerEngineBuildDir}"
-case ${TARGETOS} in
-	linux)
-		for f in dockerd docker-init docker-proxy; do
-			if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
-				cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${dockerEngineBuildDir}/$f"
-			fi
-		done
-		# TODO containerd binaries should be built as part of containerd-packaging, not as part of docker/docker-ce-packaging
-		mkdir -p "${containerdBuildDir}"
-		for f in containerd ctr containerd-shim containerd-shim-runc-v2 runc; do
-			if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
-				cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${containerdBuildDir}/$f"
-			fi
-		done
-		;;
-	windows)
-		for f in dockerd.exe docker-proxy.exe; do
-			if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
-				cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${dockerEngineBuildDir}/$f"
-			fi
-		done
-		;;
-esac
-# package docker, containerd, and runc
-case ${TARGETOS} in
-	darwin)
-		(
-			set -x
-			tar -C "${buildDir}" -c -z -f "${buildDir}/docker-engine-${GEN_STATIC_VER}.tgz" docker-engine
-		)
-		;;
-	linux)
-		(
-			set -x
-			tar -C "${buildDir}" -c -z -f "${buildDir}/docker-engine-${GEN_STATIC_VER}.tgz" docker-engine
-			tar -C "${buildDir}" -c -z -f "${buildDir}/containerd-${CONTAINERD_VERSION#v}.tgz" containerd
-		)
-		;;
-	windows)
-		(
-			cd "${buildDir}"
-			set -x
-			zip -r "docker-engine-${GEN_STATIC_VER}.zip" docker-engine
-		)
-		;;
-esac
+if [ -d "${ENGINE_DIR}/build" ]; then
+	case ${TARGETOS} in
+		linux)
+			for f in dockerd docker-init docker-proxy; do
+				if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
+					cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${dockerEngineBuildDir}/$f"
+				fi
+			done
+			# TODO containerd binaries should be built as part of containerd-packaging, not as part of docker/docker-ce-packaging
+			mkdir -p "${containerdBuildDir}"
+			for f in containerd ctr containerd-shim containerd-shim-runc-v2 runc; do
+				if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
+					cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${containerdBuildDir}/$f"
+				fi
+			done
+			;;
+		windows)
+			for f in dockerd.exe docker-proxy.exe; do
+				if [ -f "${ENGINE_DIR}/build/${targetPair}/$f" ]; then
+					cp -L "${ENGINE_DIR}/build/${targetPair}/$f" "${dockerEngineBuildDir}/$f"
+				fi
+			done
+			;;
+	esac
+	# package docker, containerd, and runc
+	case ${TARGETOS} in
+		linux)
+			(
+				set -x
+				tar -C "${buildDir}" -c -z -f "${buildDir}/docker-engine-${GEN_STATIC_VER}.tgz" docker-engine
+				tar -C "${buildDir}" -c -z -f "${buildDir}/containerd-${CONTAINERD_VERSION#v}.tgz" containerd
+			)
+			;;
+		windows)
+			(
+				cd "${buildDir}"
+				set -x
+				zip -r "docker-engine-${GEN_STATIC_VER}.zip" docker-engine
+			)
+			;;
+	esac
+fi
 
 # docker CLI + docker engine
 # TODO: for backward compat keep a copy of the old docker.tgz for now