env-guard-checker 0.1.4

Pre-flight environment checks. Like Pydantic, but for your infra.

envguard

Pre-flight environment validation for Python projects.
Checks env vars, TCP ports, HTTP endpoints and files — before you deploy.

pip install envguard

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─────────────── pre-flight check ───────────────

  ENV VARS
  ✓  OPENAI_API_KEY       present
  ✓  REDIS_URL            present
  ✗  DATABASE_URL         missing

  TCP PORTS
  ✓  Redis                localhost:6379 reachable
  ✗  PostgreSQL           localhost:5432 connection refused

  HTTP ENDPOINTS
  ✓  OpenAI reachable     200 OK
  ✗  App health           connection refused

─────────────────────────────────────────────────────────────
  3 checks failed, 2 passed, 5 total
  Run with --hints for suggestions.

Contents

• Installation
• Quickstart
• Config reference
• CLI
• Makefile / CI
• Contributing
• Known issues

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Installation

pip install envguard

Requires Python 3.9+.

Quickstart

# generate a starter envguard.yaml
envguard init

# run checks
envguard check

# show fix suggestions for failures
envguard check --hints

envguard walks up the directory tree looking for envguard.yaml automatically.
If a .env file exists in the current directory, it's loaded before checks run.

Config reference

name: my-app

env_vars:
  - key: OPENAI_API_KEY
    required: true
    validate: starts_with:sk-

  - key: DATABASE_URL
    required: true
    validate: contains:postgresql

  - key: DEBUG
    required: false        # skipped if missing, won't fail

tcp_ports:
  - host: localhost
    port: 5432
    label: PostgreSQL      # shown in output instead of host:port
    timeout: 3.0           # seconds, default 3.0

http_endpoints:
  - url: http://localhost:8000/health
    expect_status: 200
    timeout: 5.0

files:
  - path: .env
    type: file
  - path: ./data
    type: directory

validate rules for env vars

Rule	Example	Description
starts_with:<s>	starts_with:sk-	value must start with s
ends_with:<s>	ends_with:.local	value must end with s
contains:<s>	contains:postgresql	value must contain s
min_length:<n>	min_length:32	value length must be ≥ n

CLI

envguard check                     run all checks
envguard check --hints             show hints for failed checks
envguard check -c path/to/file     use a specific config file
envguard init                      generate a starter config
envguard init --name my-app        set project name

Exit code: 0 if all checks pass, 1 if any fail.

Makefile / CI

deploy:
	envguard check || exit 1
	docker compose up -d

# .github/workflows/deploy.yml
- name: Pre-flight check
  run: envguard check

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Contributing

Issues and pull requests are welcome.

Reporting a bug

Before opening an issue, check existing issues to avoid duplicates.

A good bug report includes:

• envguard version (pip show envguard)
• Python version and OS
• your envguard.yaml (redact secrets)
• full output with envguard check
• what you expected to happen

Suggesting a feature

Open an issue with the enhancement label.
Describe the use case, not just the feature — it helps figure out the right solution.

Sending a pull request

git clone https://github.com/IvanYanishevskyi/env-guard§
cd envguard
pip install -e ".[dev]"

A few ground rules:

• one PR per feature or fix
• add a test for new behavior
• don't bump the version — that happens on release
• if you're fixing a bug, reference the issue number in the PR description

Not sure if a change is in scope? Open an issue first and ask.

Adding a new check type

Check implementations live in envguard/checks/.
Each check is a function that takes a spec dataclass and returns a CheckResult.
See envguard/checks/tcp.py for a minimal example.

To add a new check type end-to-end:

1. add a dataclass to models.py
2. implement the check in checks/your_check.py
3. wire it into runner.py and loader.py
4. add it to the reporter sections in reporter.py
5. write tests in tests/

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Known issues

• HTTP redirects — followed by default, no config option to disable yet
• Windows — not tested; path handling in file checks may have edge cases
• min_length with non-integer arg — fails silently instead of raising a clear error

If you hit something not listed here, please open an issue.

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License

MIT