José Almeida
58 lines
2.7 KiB
Python
58 lines
2.7 KiB
Python
"""Exercise daemon startup shell without starting Docker or proving CNI compatibility."""
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import os
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from pathlib import Path
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import subprocess
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import tempfile
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import textwrap
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import unittest
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class DaemonRouteTest(unittest.TestCase):
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def run_startup(self, ipv4="", ipv6="", mtu="1400"):
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template = Path(__file__).with_name("pod-template.yaml").read_text()
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script = textwrap.dedent(template.split(" - |\n", 1)[1].split(" securityContext:", 1)[0])
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with tempfile.TemporaryDirectory() as directory:
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root = Path(directory)
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commands = {
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"ip": 'case "$*" in "-4 route show default") printf "%s\\n" "$IPV4";; "-6 route show default") printf "%s\\n" "$IPV6";; *) exit 1;; esac',
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"cat": 'test "$1" = /sys/class/net/net1/mtu || exit 1; printf "%s\\n" "$MTU"',
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"dockerd": 'printf "%s\\n" "$@"',
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}
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for name, body in commands.items():
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command = root / name
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command.write_text("#!/bin/sh\n" + body + "\n")
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command.chmod(0o755)
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return subprocess.run(
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["sh", "-ceu", script], capture_output=True, text=True, timeout=5,
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env={**os.environ, "PATH": f"{root}:{os.environ['PATH']}",
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"IPV4": ipv4, "IPV6": ipv6, "MTU": mtu},
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)
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def test_non_eth0_default_routes(self):
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for routes in ({"ipv4": "default via 192.0.2.1 dev net1"},
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{"ipv6": "default via 2001:db8::1 dev net1"}):
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with self.subTest(routes=routes):
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result = self.run_startup(**routes)
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertIn("--mtu=1400\n", result.stdout)
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self.assertIn("--default-network-opt=bridge=com.docker.network.driver.mtu=1400", result.stdout)
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def test_nested_containers_use_a_relative_cgroup_parent(self):
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result = self.run_startup(ipv4="default via 192.0.2.1 dev net1")
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self.assertEqual(result.returncode, 0, result.stderr)
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self.assertIn("--exec-opt\nnative.cgroupdriver=cgroupfs\n", result.stdout)
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self.assertIn("--cgroup-parent=docker\n", result.stdout)
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def test_missing_route_and_invalid_mtu_fail_before_daemon(self):
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for options in ({}, {"ipv4": "default dev net1", "mtu": "invalid"},
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{"ipv4": "default dev net1", "mtu": "500"}):
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with self.subTest(options=options):
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result = self.run_startup(**options)
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self.assertNotEqual(result.returncode, 0)
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self.assertNotIn("--host=", result.stdout)
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if __name__ == "__main__":
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unittest.main()
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