didericis
914f01fa8f
Codex flagged that parallel `start`s race on shared state: two cold launches could both stop/build/boot the singleton on the same rootfs/PID, concurrent builds share the infra VM's buildah store, the cleanup did `buildah rm -a` (nuking a peer build's container), and the rootfs cache was populated non-atomically. - `infra_vm.ensure_running`: a host flock (`singleton.lock`) around the cold stop/build/boot path, with a double-checked health re-test under the lock so a second launcher adopts rather than re-boots. The healthy fast-path stays lock-free. - `image_builder.build_agent_rootfs_dir`: a host flock (`.build.lock`) around cache-lookup + build + publish; build into `.building-<digest>` and publish by atomic `os.rename`, so a partial build never appears as `agent-<digest>`. - scoped cleanup: per-build named working containers (`<tag>-smoke`/`-export`) removed by name instead of `buildah rm -a`; also cleared before the build to recover from a crashed prior run. Verified: agent image builds via the locked/atomic path, infra VM stays healthy, agent boots, `claude --version` = 2.1.172. Full unit suite + pyright green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WBMWTEtQdJ4W5UrWuLHCck
75 lines
3.0 KiB
Python
75 lines
3.0 KiB
Python
"""Unit tests for the docker-free Firecracker agent-image builder.
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The VM boot / SSH / buildah plumbing (`_build_in_infra`) is integration-tested
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on a KVM host; here we cover the cache decision, the boot-bit injection, and
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the smoke-test no-op — the logic that must hold without a VM.
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"""
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from __future__ import annotations
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import tempfile
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import unittest
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from pathlib import Path
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from unittest.mock import patch
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from bot_bottle.backend.firecracker import image_builder
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class TestBuildAgentRootfsDir(unittest.TestCase):
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def setUp(self):
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self._tmp = tempfile.TemporaryDirectory()
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self.cache = Path(self._tmp.name)
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self.dockerfile = self.cache / "Dockerfile"
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self.dockerfile.write_text("FROM node:22-slim\n")
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self.addCleanup(self._tmp.cleanup)
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def test_cache_hit_skips_rebuild(self):
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digest = image_builder._dockerfile_hash(self.dockerfile)
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base = self.cache / "rootfs" / f"agent-{digest}"
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base.mkdir(parents=True)
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(base / ".bb-ready").write_text("ok\n")
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with patch.object(image_builder.util, "cache_dir", return_value=self.cache), \
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patch.object(image_builder, "_build_in_infra") as build:
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out = image_builder.build_agent_rootfs_dir(
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self.dockerfile, image_tag="t:latest")
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build.assert_not_called()
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self.assertEqual(base, out)
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def test_cache_miss_builds_injects_and_marks_ready(self):
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with patch.object(image_builder.util, "cache_dir", return_value=self.cache), \
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patch.object(image_builder, "_build_in_infra") as build, \
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patch.object(image_builder.util, "inject_guest_boot") as inject:
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out = image_builder.build_agent_rootfs_dir(
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self.dockerfile, image_tag="t:latest", smoke_test=("claude", "--version"))
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build.assert_called_once()
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# smoke_test threads through to the VM build.
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self.assertEqual(("claude", "--version"), build.call_args.args[2])
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inject.assert_called_once()
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self.assertTrue((out / ".bb-ready").is_file())
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def test_content_addressed_cache_key(self):
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other = self.cache / "Dockerfile2"
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other.write_text("FROM python:3.12-slim\n")
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self.assertNotEqual(
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image_builder._dockerfile_hash(self.dockerfile),
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image_builder._dockerfile_hash(other),
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)
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class TestSmokeTest(unittest.TestCase):
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def test_empty_argv_is_noop(self):
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with patch.object(image_builder, "_ssh") as ssh:
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image_builder._smoke_test(Path("/k"), "10.0.0.1", "tag", "ctr", ())
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ssh.assert_not_called()
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def test_failed_smoke_dies(self):
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import subprocess
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result = subprocess.CompletedProcess([], 1, stdout="broken", stderr="")
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with patch.object(image_builder, "_ssh", return_value=result), \
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self.assertRaises(SystemExit):
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image_builder._smoke_test(Path("/k"), "10.0.0.1", "tag", "ctr", ("claude", "--version"))
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if __name__ == "__main__":
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unittest.main()
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