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Embedded bash sandbox for agents, inspired by gVisor
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1234567891011121314151617181920212223242526272829303132333435363738/** * Running Python inside a cVisor sandbox. * * How to write a Python script to disk and execute it, * all within the same isolated sandbox instance. */import { Sandbox } from "cvisor";
const sb = new Sandbox();
// Helper function to run a bash command and log its output streams.async function run(cmd: string): Promise<void> { const output = sb.runCmd(cmd); const stdout = await output.stdout(); const stderr = await output.stderr(); console.log(`cvisor> ${cmd}`); if (stdout) console.log(stdout.trimEnd()); if (stderr) console.error(stderr.trimEnd()); console.log();}
// Write a simple Python script to the sandbox filesystem, then run it.await run("python3 --version");await run("echo 'print(\"Hello from Python inside cVisor!\")' > hello.py");await run("python3 hello.py");
// Here is a script that produces some of the Fibonacci sequence.const fibScript = [ "def fib(n):", " a, b = 0, 1", " for _ in range(n):", " print(a, end=' ')", " a, b = b, a + b", " print()", "fib(10)",].join("\n");
await run(`python3 -c "${fibScript}"`);