rootfs: Add rootfs.sh script

Add script that will use helper bash
scripts that provide a way to build a rootfs
based in a OS.

Signed-off-by: Jose Carlos Venegas Munoz <jose.carlos.venegas.munoz@intel.com>

rootfs-builder/rootfs.sh

@@ -0,0 +1,122 @@
+#!/bin/bash
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+set -e
+
+script_name="${0##*/}"
+script_dir="$(dirname $(realpath -s $0))"
+ROOTFS_DIR=${ROOTFS_DIR:-${PWD}/rootfs}
+AGENT_VERSION=${AGENT_VERSION:-master}
+GO_AGENT_PKG=${GO_AGENT_PKG:-github.com/kata-containers/agent}
+AGENT_BIN=${AGENT_BIN:-kata-agent}
+# Name of file that will implement build_rootfs
+typeset -r LIB_SH="rootfs_lib.sh"
+
+if [ -n "$DEBUG" ] ; then
+	set -x
+fi
+
+#$1: Error code if want to exit differnt to 0
+usage(){
+	error="${1:-0}"
+	cat <<EOT
+USAGE: Build a Guest OS rootfs for Kata Containers image
+${script_name} [options] <distro_name>
+
+<distro_name> : Linux distribution to use as base OS.
+
+Supported Linux distributions:
+
+$(get_distros)
+
+Options:
+-h  : Show this help message
+-a  : agent version DEFAULT: ${AGENT_VERSION} ENV: AGENT_VERSION 
+-r  : rootfs directory DEFAULT: ${ROOTFS_DIR} ENV: ROOTFS_DIR
+
+ENV VARIABLES:
+GO_AGENT_PKG: Change the golang package url to get the agent source code
+            DEFAULT: ${AGENT_REPO}
+EOT
+exit "${error}"
+}
+
+die()
+{
+	msg="$*"
+	echo "ERROR: ${msg}" >&2
+	exit 1
+}
+
+info()
+{
+	msg="$*"
+	echo "INFO: ${msg}" >&2
+}
+
+OK()
+{
+	msg="$*"
+	echo "INFO: [OK] ${msg}" >&2
+}
+
+get_distros() {
+	cdirs=$(find "${script_dir}" -maxdepth 1 -type d)
+	find ${cdirs} -maxdepth 1 -name "${LIB_SH}" -printf '%H\n' | while read dir; do
+		basename "${dir}"
+	done
+}
+
+
+check_function_exist() {
+	function_name="$1"
+	[ "$(type -t ${function_name})" == "function" ] || die "${function_name} function was not defined"
+}
+
+
+while getopts c:hr: opt
+do
+	case $opt in
+		a)	AGENT_VERSION="${OPTARG}" ;;
+		h)	usage ;;
+		r)	ROOTFS_DIR="${OPTARG}" ;;
+	esac
+done
+
+shift $(($OPTIND - 1))
+
+distro="$1"
+
+[ -n "${distro}" ] || usage 1
+distro_config_dir="${script_dir}/${distro}"
+
+[ -d "${distro_config_dir}" ] || die "Not found configuration directory ${distro_config_dir}"
+rootfs_lib="${distro_config_dir}/${LIB_SH}"
+source "${rootfs_lib}"
+rootfs_config="${distro_config_dir}/config.sh"
+source "${rootfs_config}"
+
+CONFIG_DIR=${distro_config_dir}
+check_function_exist "build_rootfs"
+mkdir -p ${ROOTFS_DIR}
+build_rootfs ${ROOTFS_DIR}
+
+info "Check init is installed"
+init="${ROOTFS_DIR}/sbin/init"
+[ -x "${init}" ] || [ -L ${init} ] || die "/sbin/init is not installed in ${ROOTFS_DIR}"
+OK "init is installed"
+
+info "Pull Agent source code"
+go get -d "${GO_AGENT_PKG}" || true
+OK "Pull Agent source code"
+
+info "Build agent"
+pushd "${GOPATH}/src/${GO_AGENT_PKG}"
+make INIT=no
+make install DESTDIR="${ROOTFS_DIR}" INIT=no
+popd
+[ -x "${ROOTFS_DIR}/bin/${AGENT_BIN}" ] || die "/bin/${AGENT_BIN} is not installed in ${ROOTFS_DIR}"
+OK "Agent installed"