To keep a sharp eye on what is “right” in software development, here are a few rules I agree with.
When working on code, these are priorities:
- Failing CI
- User reported bugs.
- Self reported bugs.
- New features.
Where to fix
Solve bugs and dependencies in the lowest level possible. From low to high:
- Package management.
- Configuration management.
A package should be able to autonomously:
A configuration management contains:
- References to packages.
- Configuration files.
- Commands to activate configuration.
- A method to persistently enable software.
- Code should be understandable by anybody. If it’s to difficult to draw on a single piece of paper, simplify it.
- Code (RPM, playbook, etc) serves the smallest functionality possible.
- Push complexity to locations that users will not be bothered, keep the “interface” as simple as possible.
- Start with code that barely works. That means some assumptions will be made.
Use dependencies when absolutely required, in other words: only use dependencies when two entities have no value without each other. This ensures:
- Code can be reused maximally.
- Code can be forked.
- Assumptions are left over to the integrator.
Keep the smallest (testable) related code in a repository. This ensures autonomous development, most independent testing and easy collaboration.
There are multiple types of code:
- The code for the application - Typically Python, C, PHP, etc.
- Code packaging - Typically RPM, NPM, or PIP.
- Code for configuration - Typically Ansible or Puppet.
- The pipeline - Typically Travis-CI or GitLab-CI.
- Test code - Typically Ansible playbooks, bats, goss or bash.
Testing (integration) happens on an environment that’s production-like.
Also; see my purpose