One installer owns the environment
python/single-lockfile@v1
The project commits at most one lock file, so two installers do not each believe they own the environment.
| Id | python/single-lockfile |
| Version | v1 |
| Category | python |
| Default severity | warning |
| Interpreter | python3 |
| Timeout | 30 seconds |
| Violations tolerated | 0 |
| Collects | python |
Collectors
This guardrail gathers nothing itself. It depends on the collectors below, which the CLI runs once per build before any check, and reads what they found out of GUARDRAIL_FACTS. A collector that collects nothing skips this guardrail rather than failing it.
| Collector | Gathers | Inputs it is given |
|---|---|---|
python | The Python project in the project directory: its manifest and build backend, the Python version it asks for, the requirements it declares and which of them are pinned, and the lock files committed beside them. | projectDir |
The inputs above are this guardrail's own, passed straight through. Configuring one in buildnote.json changes what is collected, and two guardrails configured the same way share the one collection.
Configuration
{
"guardrails": {
"failOn": "error",
"comment": true,
"checks": [
{
"use": "python/single-lockfile@v1",
"severity": "warning",
"with": {
"projectDir": "."
},
"exemptions": []
}
]
}
}Inputs
| Input | Description | Default | Environment variable |
|---|---|---|---|
projectDir | Directory holding the project, relative to the directory the CLI runs in. | . | GUARDRAIL_INPUT_PROJECTDIR |
How to fix
Pick the installer the project actually uses and delete the other lock files. A checkout carrying both poetry.lock and uv.lock installs different versions depending on which command the developer or the CI step reached for, and the one nobody runs drifts silently until the day somebody does.
More in python
python/build-backend-declared. A packaged project names its build backend in[build-system], so it builds the same way everywhere.python/lockfile-committed. The project commits a lock file, so an install of the same commit resolves the same versions.python/version-declared. The project declares the Python version it is built and run against, and that version is no older than the configured floor.