#!/bin/bash -e

set -e
set -u

cd $(dirname $0)
root=$(pwd)
. $root/settings.sh

git_export()
{
    git_dir=$1
    ref=$2
    destination=$3

    echo "Exporting ${ref} from ${git_dir}"

    mkdir -p $destination
    git --git-dir=${git_dir} archive ${ref} | tar -x -C ${destination}

    git config -f $destination/.gitmodules -l |
        sed -n 's/submodule\.\([^.]*\)\.path=\(.*\)/\1 \2/p' |
        while read line
        do
            set $line
            name=$1
            path=$2

            hash=$(git --git-dir=$git_dir \
                ls-tree $ref $path |
                cut -f 1 | cut -d ' ' -f 3)

            repo=$(git config -f $destination/.gitmodules submodule.$name.url)
            #TODO: Check that repo is a relative path...

            echo "Export ${name}"
            git --git-dir=${git_dir}/${repo} archive ${hash} |
                tar -x -C ${destination}/${path}
        done
}

git_export $*