rootfs: Add script for Fedora base OS

Add scirpts to build a rootfs based on Fedora.

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

rootfs-builder/fedora/Dockerfile

@@ -0,0 +1,3 @@
+From fedora:27
+
+RUN dnf -y update && dnf install -y git golang  systemd pkgconfig

rootfs-builder/fedora/config.sh

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+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+#Fedora version to use
+OS_VERSION=${OS_VERSION:-27}
+PACKAGES="systemd iptables"

rootfs-builder/fedora/rootfs_lib.sh

@@ -0,0 +1,88 @@
+#!/bin/bash
+#
+# Copyright (c) 2017 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+set -e
+
+check_program(){
+	type "$1" >/dev/null 2>&1
+}
+
+generate_dnf_config()
+{
+	cat > "${DNF_CONF}" << EOF
+[main]
+cachedir=/var/cache/dnf/kata/
+keepcache=0
+debuglevel=2
+logfile=/var/log/dnf.log
+exactarch=1
+obsoletes=1
+gpgcheck=0
+plugins=0
+installonly_limit=3
+#Dont use the default dnf reposdir
+#this will prevent to use host repositories
+reposdir=/root/mash
+
+[kata]
+name=fedora
+failovermethod=priority
+baseurl=${REPO_URL}
+enabled=1
+gpgcheck=0
+EOF
+}
+
+build_rootfs()
+{
+	# Mandatory
+	local ROOTFS_DIR=$1
+
+	#In case rootfs is created usig repositories allow user to modify
+	# the default URL
+	local REPO_URL=${REPO_URL:-http://mirror.math.princeton.edu/pub/fedora/linux/releases/$OS_VERSION/Everything/x86_64/os/}
+
+	# In case of support EXTRA packages, use it to allow
+	# users add more packages to the base rootfs
+	local EXTRA_PKGS=${EXTRA_PKGS:-""}
+
+	#PATH where files this script is placed
+	#Use it to refer to files in the same directory
+	#Exmaple: ${CONFIG_DIR}/foo
+	#local CONFIG_DIR=${CONFIG_DIR}
+
+	check_root
+	if [ ! -f "${DNF_CONF}" ]; then
+		DNF_CONF="./kata-fedora-dnf.conf"
+		generate_dnf_config
+	fi
+	mkdir -p "${ROOTFS_DIR}"
+	if [ -n "${PKG_MANAGER}" ]; then
+		info "DNF path provided by user: ${PKG_MANAGER}"
+	elif check_program "dnf"; then
+		PKG_MANAGER="dnf"
+	elif check_program "yum" ; then
+		PKG_MANAGER="yum"
+	else
+		die "neither yum nor dnf is installed"
+	fi
+
+	info "Using : ${PKG_MANAGER} to pull packages from ${REPO_URL}"
+
+	DNF="${PKG_MANAGER} --config=$DNF_CONF -y --installroot=${ROOTFS_DIR} --noplugins"
+	$DNF install ${EXTRA_PKGS} ${PACKAGES}
+
+	[ -n "${ROOTFS_DIR}" ]  && rm -r "${ROOTFS_DIR}/var/cache/dnf"
+}
+
+
+check_root()
+{
+	if [ "$(id -u)" != "0" ]; then
+		echo "Root is needed"
+		exit 1
+	fi
+}