Debugging Lua inside Openresty inside Docker with IntelliJ IDEA - Blogpost Summary

code.lua

-- snip

-- Fix debugger paths
local debug_sources_dir = os.getenv('DEBUG_SOURCES_DIR')
_G.emmy = {}
_G.emmy.fixPath = function(path)
    return string.gsub(path, '/etc/nginx/', debug_sources_dir..'/')
end

-- Load debugger
package.cpath = package.cpath .. ';/usr/local/emmy/?.so'
local dbg = require('emmy_core')
dbg.tcpListen('localhost', 9966)

-- Wait for IDE connection
dbg.waitIDE()

-- snip

compose.sh

export DEBUG_SOURCES_DIR="..."
# snip

docker-compose.yaml

services:
  nginx:
    # --- snip ---
    ports:
      - "9966:9966"
    environment:
      DEBUG_SOURCES_DIR:

Dockerfile

# --- snip ---

# Note: You might need to install CMake here as well, see the guide for how
RUN curl https://github.com/EmmyLua/EmmyLuaDebugger/archive/refs/tags/1.0.16.tar.gz \
         -L -o EmmyLuaDebugger-1.0.16.tar.gz && \
    tar -xzvf EmmyLuaDebugger-1.0.16.tar.gz && \
    cd EmmyLuaDebugger-1.0.16 && \
        mkdir -p build && \
        cd build && \
            cmake -DCMAKE_BUILD_TYPE=Release ../ && \
            make install && \
            mkdir -p /usr/local/emmy && \
            cp install/bin/emmy_core.so /usr/local/emmy/ && \
        cd .. && \
    cd .. && \
    rm -rf EmmyLuaDebugger-1.0.16 EmmyLuaDebugger-1.0.16.tar.gz

# --- snip ---

nginx.conf

env DEBUG_SOURCES_DIR;

These snippets are used in the Debugging Lua inside Openresty inside Docker with IntelliJ IDEA blogpost.