#!/bin/bash

# Copyright (c) 2012-2014 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
#
# See the License for the specific language governing permissions and
# limitations under the License.

# dib-lint: disable=setpipefail
if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
    set -x
fi
set -eu

# We need a copy of the devstack repo to query for the list of image
# files to cached by the source-repositories element (see
# 55-cache-devstack-repos)
#
# This script is a hack to use the source-repositories repo cache to
# get early access to the devstack checkout (rather than doing a whole
# separate clone of the devstack tree). In essence, this script knows
# the path of the devstack in the source-repositories cache and
# creates/updates it.  To get the gist of where this comes from, see
# dib's
#  elements/source-repositories/extra-data.d/98-source-repositories
#
# This could be removed if we could ever source and call the
# clone/update functions asynchronously from the source-repositories
# dib element.

function get_devstack_from_cache {

    local REPONAME=devstack
    local REPOTYPE=git
    local REPOPATH=/opt/git/openstack-dev/devstack
    local REPOLOCATION=git://git.openstack.org/openstack-dev/devstack.git
    local REPOREF=master

    local REPO_DEST=$TMP_MOUNT_PATH$REPOPATH
    local REPO_SUB_DIRECTORY=$(dirname $REPO_DEST)
    sudo mkdir -p $REPO_SUB_DIRECTORY

    # build the same cache name as source-repositories
    CACHE_NAME=$(echo "${REPOTYPE}_${REPOLOCATION}" | sha1sum | awk '{ print $1 }' )
    CACHE_NAME=${REPONAME//[^A-Za-z0-9]/_}_${CACHE_NAME}
    CACHE_PATH=${CACHE_BASE}/$CACHE_NAME

    # clone repo if not in cache
    if [ ! -e "$CACHE_PATH" ] ; then
        echo "early-source-repo: Caching $REPONAME from $REPOLOCATION in $CACHE_PATH"
        git clone $REPOLOCATION $CACHE_PATH.tmp
        mv ${CACHE_PATH}{.tmp,}
    fi

    # update cached repo
    if [ -z "$DIB_OFFLINE"  ] ; then
        echo "early-source-repo: Updating cache of $REPOLOCATION in $CACHE_PATH with ref $REPOREF"
        # note, we could update *all* refs here (+refs/*:refs/* and
        # create a really full mirror.  but that brings in a lot of
        # change refs from gerrit which traditionally we haven't used.
        # Also, we only really care about refs/remotes/* as the
        # devstack caching script goes through these branches to
        # decide what to checkout.  We keep refs/heads/* for
        # historical reasons...)
        git --git-dir=$CACHE_PATH/.git fetch --prune --update-head-ok \
            $REPOLOCATION \
            +refs/heads/*:refs/heads/* +refs/remotes/*:refs/remotes/*
    fi

    # clone the updated repo to our destination
    sudo git clone $CACHE_PATH $REPO_DEST
}

# in case source-repositories hasn't run yet, make the cache
CACHE_BASE=$DIB_IMAGE_CACHE/source-repositories
mkdir -p $CACHE_BASE

get_devstack_from_cache