#!/bin/bash
#
# Copyright (c) 2013 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
# This uses Gentoo's catalyst for very thoroughly building images from
# scratch. Using images based on this will eliminate some of the hackery
# in make_chroot.sh for building up the sdk from a stock stage3 tarball.
# 
# For reference the procedure it performs is this:
# 
# 1. snapshot: Grab a snapshot of portage-stable. Note that overalys are
#    not snapshotted.
# 2. stage1: Using a "seed" tarball as a build environment, build a
#    minimal root file system into a clean directory using ROOT=...
#    and USE=-* The restricted USE flags are key be small and avoid
#    circular dependencies.
# 3. stage2: Run portage-stable/scripts/bootstrap.sh
#    This rebuilds the toolchain. Probably not strictly necessary most of
#    the time but does super-duper-promise that the toolchain isn't linked
#    to or otherwise influenced by whatever was in the "seed" tarball.
# 4. stage3: Run emerge -e system to rebuild everything using the fresh
#    toolchain using the normal USE flags provided by the profile. This
#    will also pull in assorted base system packages that weren't included
#    in the minimal environment stage1 created.
# 5. stage4: Install any extra packages or other desired tweaks. For the
#    sdk we just install all the packages normally make_chroot.sh does.
#
# Usage: bootstrap_sdk [stage1 stage2 etc]
# By default all four stages will be built using the latest stage4 as a seed.

SCRIPT_ROOT=$(dirname $(readlink -f "$0"))
. "${SCRIPT_ROOT}/common.sh" || exit 1

TYPE="coreos-sdk"

. "${BUILD_LIBRARY_DIR}/catalyst.sh" || exit 1

# include upload options
. "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1

## Define the stage4 config template
catalyst_stage4() {
cat <<EOF
target: stage4
pkgcache_path: $BINPKGS
stage4/packages: coreos-devel/sdk-depends
stage4/fsscript: ${BUILD_LIBRARY_DIR}/catalyst_default_stage4.sh
stage4/root_overlay: ${TEMPDIR}/stage4_overlay
EOF
catalyst_stage_default
}

catalyst_init "$@"
check_gsutil_opts

if [[ "$STAGES" =~ stage4 ]]; then
    info "Setting release to ${COREOS_VERSION_STRING}"
    rm -rf "${TEMPDIR}/stage4_overlay"
    mkdir -p "${TEMPDIR}/stage4_overlay"
    "${BUILD_LIBRARY_DIR}/set_lsb_release" \
        --root "${TEMPDIR}/stage4_overlay"
fi

catalyst_build

if [[ "$STAGES" =~ stage4 ]]; then
    info "Build complete! Changing output name to something more sensible."
    build_name="stage4-${ARCH}-${FLAGS_version}.tar.bz2"
    release_name="${TYPE}-${ARCH}-${FLAGS_version}.tar.bz2"
    ln -f "$BUILDS/${build_name}" "$BUILDS/${release_name}"
    ln -f "$BUILDS/${build_name}.CONTENTS" "$BUILDS/${release_name}.CONTENTS"
    sed -e "s/${build_name}/${release_name}/" \
        "$BUILDS/${build_name}.DIGESTS" > "$BUILDS/${release_name}.DIGESTS"

    # Validate we didn't break the DIGESTS with sed
    verify_digests "$BUILDS/${release_name}" "$BUILDS/${release_name}.CONTENTS"

    info "SDK ready: $BUILDS/${release_name}"

    def_upload_path="${UPLOAD_ROOT}/sdk/${ARCH}/${FLAGS_version}"
    upload_files "tarball" "${def_upload_path}" "" "$BUILDS/${release_name}" \
        "$BUILDS/${release_name}.CONTENTS" "$BUILDS/${release_name}.DIGESTS"
    upload_files "packages" "${def_upload_path}" "pkgs/" "${BINPKGS}"/*
fi

command_completed