fork_and_test.py

import osfrom upstream import Upstream REPO = "https://github.com/you/app"SETUP = f"git clone {REPO} app && cd app && uv sync"TEST = "cd app && git apply fix.patch && uv run pytest -q" client = Upstream(api_key=os.environ["UPSTREAM_API_KEY"])  def try_fixes(patches):    with client.sandbox(template="python") as base:        base.exec(["sh", "-c", SETUP])         # one prepared machine, one fork per candidate fix        forks = [base.fork() for _ in patches]         for sb, patch in zip(forks, patches):            sb.write_file("/workspace/app/fix.patch", patch)            r = sb.exec(["sh", "-c", TEST])            print(sb.sandbox_id, "pass" if r.exit_code == 0 else "fail")            sb.destroy()