cat > /etc/apt/preferences.d/security.pref <<EOL
Package: *
Pin: release l=Debian-Security
Pin-Priority: 1000
EOL
cat > /etc/apt/preferences.d/stable.pref <<EOL
Package: *
Pin: release a=stable
Pin-Priority: 900
EOL
cat > /etc/apt/preferences.d/testing.pref <<EOL
Package: *
Pin: release a=testing
Pin-Priority: 750
EOL
cat > /etc/apt/sources.list.d/testing.list <<EOL
deb http://deb.debian.org/debian testing main
deb-src http://deb.debian.org/debian testing main
EOL
apt-get update
apt install -y --allow-downgrades git cmake ninja-build clang python uuid-dev libicu-dev icu-devtools libbsd-dev libedit-dev libxml2-dev libsqlite3-dev swig/testing libpython-dev libncurses5-dev pkg-config libblocksruntime-dev libcurl4-openssl-dev systemtap-sdt-dev tzdata rsync

mkdir ~/swift-src
cd ~/swift-src
git clone https://github.com/apple/swift.git
cd ~/swift-src/swift
VERSION='swift-4.2.1-RELEASE'
git checkout $VERSION
./utils/update-checkout --clone --tag $VERSION

./utils/build-toolchain org.swift
mkdir /opt/swift
tar -xzf swift-*.tar.gz -C /opt/swift
export PATH=$PATH:/opt/swift/usr/bin

mkdir ~/vapor-src
cd ~/vapor-src
git clone https://github.com/vapor/toolbox.git
cd toolbox

if [ ! -f ~/.ssh/id_*.pub ]; then
    ssh-keygen -t rsa -b 4096 -C 'git@github.com'
fi

while [[ "$(ssh -T git@github.com 2>&1)" != *"You've successfully authenticated, but GitHub does not provide shell access." ]] ; do
    echo
    cat ~/.ssh/id_*.pub
    echo
    read -p 'add pub key to https://github.com/settings/keys then hit [return] to continue'
done

swift build -c release