prometheus-lua

#!/usr/bin/env sh
set -eu

SCRIPT_PATH="$0"
while [ -L "$SCRIPT_PATH" ]; do
  LINK_TARGET="$(readlink "$SCRIPT_PATH")"
  case "$LINK_TARGET" in
    /*) SCRIPT_PATH="$LINK_TARGET" ;;
    *) SCRIPT_PATH="$(dirname "$SCRIPT_PATH")/$LINK_TARGET" ;;
  esac
done
SCRIPT_DIR=$(CDPATH= cd -- "$(dirname -- "$SCRIPT_PATH")" && pwd)
BUNDLED_LUA="$SCRIPT_DIR/runtime/lua"

: "${PROMETHEUS_LUA_VERSION:=dev}"
export PROMETHEUS_LUA_VERSION

if [ -x "$BUNDLED_LUA" ]; then
  exec "$BUNDLED_LUA" "$SCRIPT_DIR/cli.lua" "$@"
fi

if command -v luajit >/dev/null 2>&1; then
  exec luajit "$SCRIPT_DIR/cli.lua" "$@"
fi

if command -v lua5.1 >/dev/null 2>&1; then
  exec lua5.1 "$SCRIPT_DIR/cli.lua" "$@"
fi

if command -v lua >/dev/null 2>&1; then
  exec lua "$SCRIPT_DIR/cli.lua" "$@"
fi

echo "No Lua runtime found. Reinstall with official installer or install Lua5.1/LuaJIT." >&2
exit 1