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On some Linux distributions (Amazon Linux 2023), the default `iptables` install includes a blanket deny rule in the `FORWARD` chain that prevents packets from the tunnel interface from ever leaving the host. To fix this, we ensure our `FORWARD` chain rules are inserted with priority 1 which takes precedence over the blanket-deny rule. We also update our MASQUERADE in the NAT table to apply only to the CIDR range possible for Gateway tunnel IPs, as opposed to the default `0.0.0.0/0`. Fixes #8481
Firezone shell scripts
This directory contains various shell scripts used for development, testing, and deployment of the Firezone product.
Developer Setup
We lint shell scripts in CI. To get your PR to pass, you'll want to ensure your local development environment is set up to lint shell scripts:
- Install
shfmt:brew install shfmton macOS- Install shfmt from https://github.com/mvdan/sh/releases for other platforms
- Install
shellcheck:brew install shellcheckon macOSsudo apt-get install shellcheckon Ubuntu
Then just lint and format your shell scripts before you commit:
shfmt -i 4 **/*.sh
shellcheck --severity=warning **/*.sh
You can achieve this more easily by using pre-commit. See
CONTRIBUTING.
Editor setup
- Vim (here's an example using ALE)
- VSCode
Scripting tips
- Use
#!/usr/bin/env bashalong withset -euox pipefailin general for dev and test scripts. - In Docker images and other minimal envs, stick to
#!/bin/shand simplyset -eu.