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#!/usr/bin/python3
# Author: Benjamin Drung <bdrung@ubuntu.com>
"""Test debconf configuration."""
import contextlib
import os
import pathlib
import re
import subprocess
import sys
import typing
import unittest
class TestDebconf(unittest.TestCase):
"""Test debconf configuration."""
etc_localtime = pathlib.Path("/etc/localtime")
etc_timezone = pathlib.Path("/etc/timezone")
def setUp(self) -> None:
self.orig_timezone = self._get_timezone()
with contextlib.suppress(FileNotFoundError):
self.etc_timezone.unlink()
def tearDown(self) -> None:
self._set_timezone(self.orig_timezone)
@staticmethod
def _call_debconf_set_selections(selections: str) -> None:
subprocess.run(
["debconf-set-selections"], check=True, encoding="utf-8", input=selections
)
@staticmethod
def _call_dpkg_reconfigure() -> None:
subprocess.run(
["dpkg-reconfigure", "--frontend", "noninteractive", "tzdata"], check=True
)
@staticmethod
def _call_postinst(preversion: str) -> None:
subprocess.run(
["/var/lib/dpkg/info/tzdata.postinst", "configure", preversion], check=True
)
@staticmethod
def _get_debconf_selections() -> dict[str, str]:
debconf_show = subprocess.run(
["debconf-show", "tzdata"], capture_output=True, check=True, text=True
)
debconf_re = re.compile("^[ *] ([^:]+): *(.*)$", flags=re.MULTILINE)
return dict(debconf_re.findall(debconf_show.stdout))
def _get_selection(self) -> str:
selections = self._get_debconf_selections()
area = selections["tzdata/Areas"]
zone = selections[f"tzdata/Zones/{area}"]
return f"{area}/{zone}"
def _get_timezone(self) -> str:
absolute_path = self.etc_localtime.parent / self.etc_localtime.readlink()
timezone = pathlib.Path(os.path.normpath(absolute_path))
return str(timezone.relative_to("/usr/share/zoneinfo"))
def _set_timezone(self, timezone: typing.Union[pathlib.Path, str]) -> None:
with contextlib.suppress(FileNotFoundError):
self.etc_localtime.unlink()
if isinstance(timezone, str):
target = pathlib.Path("/usr/share/zoneinfo") / timezone
else:
target = timezone
self.etc_localtime.symlink_to(target)
@staticmethod
def _reset_debconf() -> None:
subprocess.run(
["debconf-communicate", "tzdata"],
check=True,
encoding="utf-8",
env={"DEBIAN_FRONTEND": "noninteractive"},
input="RESET tzdata/Areas\nRESET tzdata/Zones/Etc\n",
stdout=subprocess.DEVNULL,
)
def test_broken_symlink(self) -> None:
"""Test pointing /etc/localtime to an invalid location."""
self._set_timezone(pathlib.Path("/bin/sh"))
self._reset_debconf()
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Etc/UTC")
self.assertEqual(self._get_selection(), "Etc/UTC")
def test_broken_symlink_but_debconf_preseed(self) -> None:
"""Test broken /etc/localtime but existing debconf answers."""
self._set_timezone(pathlib.Path("/bin/sh"))
self._call_debconf_set_selections(
"tzdata tzdata/Areas select Pacific\n"
"tzdata tzdata/Zones/Pacific select Yap\n"
)
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Pacific/Yap")
self.assertEqual(self._get_selection(), "Pacific/Yap")
def test_etc_localtime_precedes_debconf_preseed(self) -> None:
"""Test dpkg-reconfigure uses /etc/localtime over preseed."""
self._set_timezone("Asia/Jerusalem")
self._call_debconf_set_selections(
"tzdata tzdata/Areas select Australia\n"
"tzdata tzdata/Zones/Australia select Sydney\n"
)
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Asia/Jerusalem")
self.assertEqual(self._get_selection(), "Asia/Jerusalem")
def test_default_to_utc(self) -> None:
"""Test dpkg-reconfigure defaults to Etc/UTC."""
self.etc_localtime.unlink()
self._reset_debconf()
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Etc/UTC")
self.assertEqual(self._get_selection(), "Etc/UTC")
def test_postinst_removes_etc_timezone_on_upgrade(self) -> None:
"""Test postinst removes existing /etc/timezone on upgrade."""
for version in [
"2024a-0+deb11u1",
"2025b-0+deb11u2",
"2025b-0+deb12u2",
"2025b-0ubuntu0.24.04.1",
"2025b-3ubuntu1",
"2025b-4+deb13u1",
"2026b-0ubuntu0.25.10.1",
"2030a-1+deb13u1",
"2030a-0ubuntu0.24.04.1",
"2025c-1",
]:
with self.subTest(version=version):
self.etc_timezone.write_bytes(b"Europe/Oslo")
self._call_postinst(version)
self.assertFalse(self.etc_timezone.exists())
for version in ["2025c-2", "2026b-0ubuntu0.26.04.1", "2030a-1"]:
with self.subTest(version=version):
self.etc_timezone.write_bytes(b"Europe/Oslo")
self._call_postinst(version)
self.assertTrue(self.etc_timezone.exists())
def test_reconfigure_does_not_create_etc_timezone(self) -> None:
"""Test dpkg-reconfigure does not create /etc/timezone."""
self._set_timezone("America/New_York")
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "America/New_York")
self.assertFalse(self.etc_timezone.exists())
self.assertEqual(self._get_selection(), "America/New_York")
def test_reconfigure_does_no_modify_etc_timezone(self) -> None:
"""Test dpkg-reconfigure does not modify existing /etc/timezone."""
self._set_timezone("Europe/Oslo")
self.etc_timezone.write_bytes(b"Foo/Bar")
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Europe/Oslo")
self.assertEqual(self._get_selection(), "Europe/Oslo")
self.assertTrue(self.etc_timezone.exists())
self.assertEqual(self.etc_timezone.read_bytes(), b"Foo/Bar")
def test_reconfigure_symlinked_timezone(self) -> None:
"""Test dpkg-reconfigure for symlinked timezone."""
self._set_timezone("Arctic/Longyearbyen")
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Arctic/Longyearbyen")
self.assertEqual(self._get_selection(), "Arctic/Longyearbyen")
def test_relative_symlink(self) -> None:
"""Test relative symlink /etc/localtime."""
timezone = pathlib.Path("../usr/share/zoneinfo/Europe/Berlin")
self._set_timezone(timezone)
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Europe/Berlin")
self.assertEqual(self.etc_localtime.readlink(), timezone)
self.assertEqual(self._get_selection(), "Europe/Berlin")
def test_update_obsolete_timezone(self) -> None:
"""Test updating obsolete timezone to current one."""
self._set_timezone("Mideast/Riyadh88")
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Asia/Riyadh")
self.assertEqual(self._get_selection(), "Asia/Riyadh")
def test_preesed(self) -> None:
"""Test preseeding answers with non-existing /etc/localtime."""
self.etc_localtime.unlink()
self._call_debconf_set_selections(
"tzdata tzdata/Areas select Europe\n"
"tzdata tzdata/Zones/Europe select Berlin\n"
)
self._call_dpkg_reconfigure()
self.assertEqual(self._get_timezone(), "Europe/Berlin")
self.assertEqual(self._get_selection(), "Europe/Berlin")
def main() -> None:
"""Run unit tests in verbose mode."""
argv = sys.argv.copy()
argv.insert(1, "-v")
unittest.main(argv=argv)
if __name__ == "__main__":
main()
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