snapshot-replay

Demonstrates alineo's checkpoint and resume feature: run once to install dependencies and capture a snapshot, then resume from that snapshot — skipping the install — to run updated code against the same environment.

Setup

bunx alineo-cli init   # starts OpenSandbox in Docker (one-time setup)

Run

bun install
bun start

What it does

Initial run

1. Creates a Python 3.11 sandbox
2. Installs requests via pip
3. Captures a checkpoint (after-install)
4. Runs a script and closes the sandbox

Resumed run

1. Calls client.resume(sandboxId) — boots from the snapshot
2. The pip install call returns cached output instantly (never re-runs)
3. Runs an updated script on the restored container

Run bun start twice to see the difference: first run takes ~30–60s; the resume takes ~2–3s.