# s3-lifecycle-delta
A small Python library to **compute and apply deltas** on AWS S3 lifecycle policies—especially focused on safe, declarative **storage class transitions**—with dry-run, validation, and minimal disruption.
## Problem
AWS S3 lifecycle policies are typically applied by overwriting the entire configuration. That makes automated changes brittle, error-prone, and risky when you only want to tweak transitions (e.g., change from `STANDARD` → `GLACIER` after 90 days) without accidentally deleting other rules.
This library:
- Introspects the current lifecycle policy
- Compares it to the desired policy (the "delta")
- Shows what would change (dry-run)
- Validates rules
- Applies only the intended change safely
## Features
- Declarative lifecycle policy definitions (via Python / JSON)
- Diff engine: detects rule adds / updates / deletes
- Safe apply with `dry-run`
- Validation of transition semantics (e.g., non-decreasing days)
- Idempotent behavior
- Pluggable for custom validation or rule logic
## Quickstart
### Install (editable for dev)
```bash
git clone https://github.com/your-org/s3-lifecycle-delta.git
cd s3-lifecycle-delta
pip install -e .
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"description": "# s3-lifecycle-delta\n\nA small Python library to **compute and apply deltas** on AWS S3 lifecycle policies\u2014especially focused on safe, declarative **storage class transitions**\u2014with dry-run, validation, and minimal disruption.\n\n## Problem\n\nAWS S3 lifecycle policies are typically applied by overwriting the entire configuration. That makes automated changes brittle, error-prone, and risky when you only want to tweak transitions (e.g., change from `STANDARD` \u2192 `GLACIER` after 90 days) without accidentally deleting other rules.\n\nThis library:\n- Introspects the current lifecycle policy\n- Compares it to the desired policy (the \"delta\")\n- Shows what would change (dry-run)\n- Validates rules\n- Applies only the intended change safely\n\n## Features\n\n- Declarative lifecycle policy definitions (via Python / JSON)\n- Diff engine: detects rule adds / updates / deletes\n- Safe apply with `dry-run`\n- Validation of transition semantics (e.g., non-decreasing days)\n- Idempotent behavior\n- Pluggable for custom validation or rule logic\n\n## Quickstart\n\n### Install (editable for dev)\n\n```bash\ngit clone https://github.com/your-org/s3-lifecycle-delta.git\ncd s3-lifecycle-delta\npip install -e .\n",
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