#!/usr/bin/env bash
# Eventually convert to haskell, see:
# - https://github.com/awakesecurity/nix-deploy/blob/master/src/Main.hs
# - http://www.haskellforall.com/2018/08/nixos-in-production.html
prefix=${PWD/$CODEROOT}
if [[ "$prefix" == "" ]]
then
  target="$1"
else
  target="$prefix.$1"
fi
what=$(realpath "${CODEROOT:?}/_/nix/$target")
# hack: get the domain from the systemd service. there does not seem to be a way
# to get it from nix-instantiate. (or, maybe i should put this in bild --plan?)
where=$(rg --only-matching --replace '$2' --regexp '(domainname ")(.*)(")' \
  "$what/etc/systemd/system/domainname.service")
nix copy --to ssh://"$USER"@"$where" "$what"
ssh "$USER"@"$where" sudo nix-env --profile /nix/var/nix/profiles/system --set "$what"
switch_cmd=(
  systemd-run
  -E LOCALE_ARCHIVE
  --collect
  --no-ask-password
  --pipe
  --quiet
  --service-type=exec
  --unit=push-switch-to-configuration
  --wait
  "$what/bin/switch-to-configuration"
  "switch"
)
# shellcheck disable=SC2029
ssh "$USER"@"$where" sudo "${switch_cmd[@]}"
echo "${GRN}good:  push:  $target${NC}"