setup-builder-startup.sh

#!/bin/bash

# called on every startup

set -ex

DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

systemctl stop docker
umount /ephemeral || true
sfdisk -f /dev/nvme0n1 <<EOF
label: dos                                                                                                                                                                                                  │
label-id: 0x7d7e658b                                                                                                                                                                                        │
device: /dev/nvme0n1                                                                                                                                                                                        │
unit: sectors                                                                                                                                                                                               │
                                                                                                                                                                                                            │
/dev/nvme0n1p1 : start=     3999744, size=   120999936, type=82                                                                                                                                             │
/dev/nvme0n1p2 : start=   124999680, size=   656248832, type=83
EOF
sync
sleep 2 # let the device get registered
mkswap /dev/nvme0n1p1
swapon /dev/nvme0n1p1
mkfs.ext4 -F /dev/nvme0n1p2
rm -rf /ephemeral
mkdir /ephemeral
mount /dev/nvme0n1p2 /ephemeral

cat >/etc/docker/daemon.json <<EOF
{
        "data-root": "/ephemeral/docker"
}
EOF

systemctl start docker