ciparity 0.2.0

Find drift between your pre-commit hooks and your GitHub Actions steps.

ciparity

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Your hooks passed. CI failed anyway. The two configs drifted apart: someone bumped ruff in .pre-commit-config.yaml and not in the workflow, someone added mypy --strict to CI only, someone added a hook CI never runs. The worse case is quieter: both sides green while a check stopped running months ago.

ciparity reads .pre-commit-config.yaml and your CI pipeline and prints where they disagree, then fixes the version drift for you. Static parsing only: no network, no Docker, no API keys, and it never runs your tools.

pip install ciparity
ciparity .

pre-commit hooks: 5   CI steps: 4

mypy     arguments differ: different arguments
           pre-commit: -
           ci:         --strict
ruff     version differs: pinned to different versions
           pre-commit: 0.5.0
           ci:         0.6.2
           fix:        rev v0.5.0 -> v0.6.2
vulture  not in pre-commit: runs in CI but is not a pre-commit hook
           ci:         ci.yml:test
python   python differs: pre-commit pins a python version CI never sets up
           pre-commit: 3.11
           ci:         3.12

4 difference(s).
1 can be fixed automatically: ciparity --fix

$ ciparity --fix
--- .pre-commit-config.yaml
+++ .pre-commit-config.yaml
@@ -2,7 +2,7 @@
   python: python3.11
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.5.0
+    rev: v0.6.2
     hooks:
       - id: ruff
         args: [--fix]

https://github.com/astral-sh/ruff-pre-commit: rev v0.5.0 -> v0.6.2

Wrote .pre-commit-config.yaml. 1 fixed, 3 left.

--fix edits .pre-commit-config.yaml as text, so comments, quotes and key order survive. It moves hooks onto the version CI already uses, because CI is the version every reviewer sees. Use --fix --dry-run to see the diff and write nothing.

Exit code is 1 when there are differences, so it works as a check.

What it looks for

Check	Example
Tool in one side only	vulture is a hook, no workflow runs it
Version drift	hook rev: v0.5.0 against pip install ruff==0.6.2, fixable
Argument drift	--strict passed in CI but not in the hook
Python version	default_language_version: python3.11 while CI sets up only 3.12
Node version	default_language_version: node 20.11.0 while CI sets up 22
Narrower in CI	CI runs pre-commit run without --all-files, so it only sees the diff

Versions are read from hook rev:, from pip install tool==x, uv tool install, pipx install, npm i -g tool@x, and from the version: input of known actions such as astral-sh/ruff-action. Commands are found inside run: blocks, including behind uv run, uvx, poetry run, npx and python -m.

Usage

ciparity [path] [--fix [--dry-run]] [--json] [--ignore pytest,codespell] [--exit-zero]

As a pre-commit hook:

repos:
  - repo: https://github.com/Topicspot/ciparity
    rev: v0.2.0
    hooks:
      - id: ciparity

Deliberate non-goals and limits

• Only GitHub Actions is parsed today. The parser layer is provider based, GitLab CI is next.
• --fix only edits .pre-commit-config.yaml. It never rewrites your workflows.
• Only tools it recognises are compared. File hygiene hooks like trailing-whitespace are ignored on purpose, nobody runs those in CI and reporting them would be noise.
• If a workflow runs pre-commit run --all-files, the two sides are parity by definition and "missing in CI" findings are suppressed.
• Composite actions and reusable workflows are not followed, so tools that only run inside them are invisible.
• Flags such as --fix or --all-files are treated as mode flags and never reported.

Alternatives

• pre-commit.ci runs your hooks as a service, which removes the drift instead of reporting it. If you can use it, use it.
• act runs workflows locally, so you can see what CI does. It answers a different question and is much heavier.
• zizmor and actionlint lint the workflow files themselves. They do not know your pre-commit config.

License

MIT

☕ Support the author

This project is free and MIT-licensed. If it saved you time, you can send a coffee.

USDT, Tron network (TRC-20) only:

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Другие языки / Other languages

• Українська: проєкт безкоштовний. Якщо він заощадив вам час — можна підтримати автора, USDT у мережі Tron (TRC-20), адреса вище.
• Русский: проект бесплатный. Если он сэкономил вам время, можно поддержать автора, USDT в сети Tron (TRC-20), адрес выше.