diskimage-builder/diskimage_builder/elements/growvols/post-install.d/80-growvols

#!/bin/bash

if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

case ${DIB_GROWVOLS_TRIGGER} in
    manual) echo "growvols triggered manually after boot"; exit ;;
    systemd) echo "growvols triggered by systemd" ;;
    *) echo "Unsupported DIB_GROWVOLS_TRIGGER: ${DIB_GROWVOLS_TRIGGER}"; exit 1 ;;
esac

cat << EOF | sudo tee /etc/default/growvols > /dev/null
GROWVOLS_ARGS="${DIB_GROWVOLS_ARGS}"
GROWVOLS_GROUP="${DIB_GROWVOLS_GROUP}"
GROWVOLS_DEVICE="${DIB_GROWVOLS_DEVICE}"
EOF

case "$DIB_INIT_SYSTEM" in
    systemd)
        systemctl enable growvols.service
        ;;
    *)
        echo "Unsupported init system"
        exit 1
        ;;
esac