#!/usr/bin/env bash

set -xeuo pipefail

SYSTEM="$1"
REMOTE_HOST="$2"
REMOTE_ROOT="$3"

nix copy "${SYSTEM}" --to "ssh://${REMOTE_HOST}?remote-store=${REMOTE_ROOT}"

ssh "${REMOTE_HOST}" -- nix-env --store "${REMOTE_ROOT}" -p "${REMOTE_ROOT}/nix/var/nix/profiles/system" --set "${SYSTEM}"

ssh "${REMOTE_HOST}" -- mkdir -p "${REMOTE_ROOT}/tmp"
TMPSH="$(ssh "${REMOTE_HOST}" -- mktemp -p "${REMOTE_ROOT}/tmp")"

# shellcheck disable=SC2087
ssh "${REMOTE_HOST}" -- tee "${TMPSH}" <<EOF
#!/usr/bin/env bash

set -euo pipefail

nix-env --store "${REMOTE_ROOT}" -p "${REMOTE_ROOT}/nix/var/nix/profiles/system" --set "${SYSTEM}"
mkdir -m 0775 -p "${REMOTE_ROOT}/etc"
touch "${REMOTE_ROOT}/etc/NIXOS"

ln -sfn /proc/mounts "${REMOTE_ROOT}/etc/mtab"

NIXOS_INSTALL_BOOTLOADER=1 nixos-enter --root "${REMOTE_ROOT}" -c "/run/current-system/bin/switch-to-configuration boot"
EOF

ssh "${REMOTE_HOST}" -- bash "${TMPSH}"