osbuilder: move code into tools directory

move all osbuilder files into `tools` directory to be able
to merge this into kata-containers repo.

Signed-off-by: Salvador Fuentes <salvador.fuentes@intel.com>

tools/osbuilder/rootfs-builder/alpine/Dockerfile.in

@@ -0,0 +1,41 @@
+#
+# Copyright (c) 2018 HyperHQ Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+From docker.io/golang:@GO_VERSION@-alpine
+
+RUN apk update && apk add \
+    apk-tools-static \
+    autoconf \
+    automake \
+    bash \
+    binutils \
+    cmake \
+    coreutils \
+    curl \
+    g++ \
+    gcc \
+    git \
+    libc-dev \
+    libseccomp \
+    libseccomp-dev \
+    linux-headers \
+    m4 \
+    make \
+    musl \
+    musl-dev \
+    tar \
+    vim
+# alpine doesn't support x86_64-unknown-linux-gnu
+# It only support x86_64-unknown-linux-musl. Even worse,
+# it doesn't support proc-macro, which is needed for serde_derive
+#
+# See issue: https://github.com/kata-containers/osbuilder/issues/386
+# -- FIXME
+#
+# Thus, we cannot build rust agent on alpine
+# The way to use alpine is to generate rootfs or build
+# go agent to get rootfs and then cp rust agent to rootfs.
+# pity..
+# RUN ln -svf /usr/bin/gcc /bin/musl-gcc; ln -svf /usr/bin/g++ /bin/musl-g++

tools/osbuilder/rootfs-builder/alpine/config.sh

@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2018 Intel Corporation
+#
+# SPDX-License-Identifier: Apache-2.0
+
+OS_NAME="Alpine"
+
+OS_VERSION=${OS_VERSION:-latest-stable}
+
+BASE_PACKAGES="alpine-base"
+
+# Alpine mirror to use
+# See a list of mirrors at http://nl.alpinelinux.org/alpine/MIRRORS.txt
+MIRROR=http://dl-5.alpinelinux.org/alpine
+
+# Mandatory Packages that must be installed
+#  - iptables: Need by Kata agent
+PACKAGES="iptables"
+
+# Init process must be one of {systemd,kata-agent}
+INIT_PROCESS=kata-agent
+# List of zero or more architectures to exclude from build,
+# as reported by  `uname -m`
+ARCH_EXCLUDE_LIST=()
+
+[ "$SECCOMP" = "yes" ] && PACKAGES+=" libseccomp" || true

tools/osbuilder/rootfs-builder/alpine/rootfs_lib.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+#
+# Copyright (c) 2018 HyperHQ Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+# - Arguments
+# rootfs_dir=$1
+#
+# - Optional environment variables
+#
+# EXTRA_PKGS: Variable to add extra PKGS provided by the user
+#
+# BIN_AGENT: Name of the Kata-Agent binary
+#
+# Any other configuration variable for a specific distro must be added
+# and documented on its own config.sh
+#
+# - Expected result
+#
+# rootfs_dir populated with rootfs pkgs
+# It must provide a binary in /sbin/init
+build_rootfs() {
+	# Mandatory
+	local ROOTFS_DIR=$1
+
+	# In case of support EXTRA packages, use it to allow
+	# users add more packages to the base rootfs
+	local EXTRA_PKGS=${EXTRA_PKGS:-}
+
+	# Populate ROOTFS_DIR
+	check_root
+	mkdir -p "${ROOTFS_DIR}"
+
+	/sbin/apk.static \
+	    -X ${MIRROR}/${OS_VERSION}/main \
+	    -U \
+	    --allow-untrusted \
+	    --root ${ROOTFS_DIR}\
+	    --initdb add ${BASE_PACKAGES} ${EXTRA_PKGS} ${PACKAGES}
+
+	mkdir -p ${ROOTFS_DIR}{/root,/etc/apk,/proc}
+	echo "${MIRROR}/${OS_VERSION}/main" >  ${ROOTFS_DIR}/etc/apk/repositories
+}