The "obvious" way to write a custom GitHub Action is using Node.js, however it's not the only way. As it turns out, a GitHub Action really just communicates with the "orchestrator" via environment variables (as inputs) and STDOUT (to produce custom outputs).

Options

When defining an action, there are …

This is a tiny little note that can help with debugging in some situations. We'll use netcat (nc) to view the raw data sent to and returned from an HTTP server¹.

Capture a Request

We'll run a dummy listener via nc and directly inspect the body of an HTTP …

I recently put on my detective hat and tracked down a bug in network error recovery in a popular PostgreSQL library. Below, we'll walk through the process of bugfinding and iteratively making the feedback loop smaller and smaller. In order to find and fix the bug I

• Confirmed the root …

In my first summer of graduate school my code suddenly stopped working because Fortran and Python (via pow() in C) do exponentiation differently. Once I debugged and understood the problem, I learned about the highly optimized assembly code produced by Fortran for integer exponents.

To give a sample of the …

TL;DR: Running Datadog (dd-agent) during local development can help confirm metrics and traces are sent as expected and can help debug when things go wrong. To run dd-agent locally just clone the dhermes/local-dd-agent¹ repository and make run.

Being able to quickly iterate with a local dd-agent helped …