# Signs $release (a store path) as a binary cache and writes, into --out:
#   router-update-<version>.bundle   one file to upload in the web UI
#   latest, cache/                   the same, laid out for `router pulls from a URL`
# usage: router-release --key KEYFILE [--out DIR] [--compression zstd|none]
key=""
out=dist
compression=zstd
while [ $# -gt 0 ]; do
  case $1 in
    --key) key=$2; shift ;;
    --out) out=$2; shift ;;
    --compression) compression=$2; shift ;;
    *) echo "usage: router-release --key KEYFILE [--out DIR] [--compression zstd|none]" >&2; exit 2 ;;
  esac
  shift
done
[ -n "$key" ] && [ -r "$key" ] || { echo "router-release: --key needs the secret key file (nix key generate-secret)" >&2; exit 1; }

mkdir -p "$out"
out=$(realpath "$out")
version=$(cat "$release/version")
rm -rf "$out/cache" "$out/latest"
nix --extra-experimental-features nix-command copy --to "file://$out/cache?secret-key=$(realpath "$key")&compression=$compression" "$release"
jq -n --arg release "$release" --arg version "$version" \
  --argjson serial "$(cat "$release/serial")" --argjson schema "$(cat "$release/schema")" \
  '{release: $release, version: $version, serial: $serial, schema: $schema}' > "$out/latest"
tar -C "$out" -cf "$out/router-update-$version.bundle" latest cache
echo "release $version ($(du -h "$out/router-update-$version.bundle" | cut -f1)):"
echo "  upload  $out/router-update-$version.bundle  in the router's web UI (Update)"
echo "  or serve $out over HTTP(S) and give the router that URL"