abstraction-config, in Python

Where a machine keeps its answer to "which store", and who said so. An administrator's machine-wide file, then this user's file, then the environment for one run — each overriding the last, key by key, with the origin of every answer kept beside it.

An application asks the machine and names no path. A key nothing set is absent, which means this machine does not have that tier: a normal answer, not an error.

This page is the Python package. The Go implementation, the file format and what is UNPROVEN are on the repository.

Install

Not on PyPI, and the names on PyPI are not ours. Clone the three repositories beside each other and install them in dependency order:

git clone https://github.com/openabstractions/abstraction-cas
git clone https://github.com/openabstractions/abstraction-watch
git clone https://github.com/openabstractions/abstraction-config

pip install ./abstraction-cas/python ./abstraction-watch/python
pip install ./abstraction-config/python

Python 3.9 or later.

An example that runs

import abstraction_config as config

store, why = config.job_store()
print("jobs live at:", store)
print("because:", why)

print(config.load().describe())

On a machine nobody has configured it prints the default and says so. It reads files and writes none, so running it changes nothing.

What an application calls

call what it does
job_store() (path, why) — where jobs live on this machine, and what decided
load() a Config: nas_store, store, log_sink, log_service, off. A file that cannot be read or parsed is skipped, with one line on stderr saying which
Config.origin(key) which authority answered for one key, and which file said so
Config.describe() what was found and where, for a status command
Config.stamp() differs whenever the answer differs, so a long-running process can ask whether anything moved instead of rebuilding
overridden() the keys the environment is deciding, whatever the files say
user_path() / machine_path() the conventional locations on this platform
watch(budget) a subscription that re-reads when the answer changes

The environment variables that override a file, one per key: ABSTRACTION_NAS_STORE, ABSTRACTION_STORE, ABSTRACTION_LOG, ABSTRACTION_LOG_SERVICE.

What may break

  • This module reads; it does not write. There is no save here. A setup step or the Go implementation writes the file.
  • A machine-wide file no administrator owns raises Untrusted rather than being obeyed. Ownership is what is checked, so a file on a filesystem that does not carry it is refused.
  • No conformance verdict. No scenario in the suite cites this layer yet — what is proven and what is not.
  • Not on any package index, and no release carries an API stability promise. Pin a commit you have read.
  • Every published transcript was produced on Windows or Linux. macOS is UNPROVEN throughout.

Apache-2.0. See LICENSE.

Project links

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License expression

Apache-2.0
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Requires

Python >=3.9

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