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import os
import shutil
import tempfile
from unittest import mock
from cloudinit import dmi, subp, util
from tests.unittests import helpers
class TestReadDMIData(helpers.FilesystemMockingTestCase):
def setUp(self):
super(TestReadDMIData, self).setUp()
self.new_root = tempfile.mkdtemp()
self.addCleanup(shutil.rmtree, self.new_root)
self.reRoot(self.new_root)
p = mock.patch("cloudinit.dmi.is_container", return_value=False)
self.addCleanup(p.stop)
self._m_is_container = p.start()
p = mock.patch("cloudinit.dmi.is_FreeBSD", return_value=False)
self.addCleanup(p.stop)
self._m_is_FreeBSD = p.start()
def _create_sysfs_parent_directory(self):
util.ensure_dir(os.path.join("sys", "class", "dmi", "id"))
def _create_sysfs_file(self, key, content):
"""Mocks the sys path found on Linux systems."""
self._create_sysfs_parent_directory()
dmi_key = "/sys/class/dmi/id/{0}".format(key)
util.write_file(dmi_key, content)
def _configure_dmidecode_return(self, key, content, error=None):
"""
In order to test a missing sys path and call outs to dmidecode, this
function fakes the results of dmidecode to test the results.
"""
def _dmidecode_subp(cmd):
if cmd[-1] != key:
raise subp.ProcessExecutionError()
return (content, error)
self.patched_funcs.enter_context(
mock.patch("cloudinit.dmi.subp.which", side_effect=lambda _: True)
)
self.patched_funcs.enter_context(
mock.patch("cloudinit.dmi.subp.subp", side_effect=_dmidecode_subp)
)
def _configure_kenv_return(self, key, content, error=None):
"""
In order to test a FreeBSD system call outs to kenv, this
function fakes the results of kenv to test the results.
"""
def _kenv_subp(cmd):
if cmd[-1] != dmi.DMIDECODE_TO_KERNEL[key].freebsd:
raise subp.ProcessExecutionError()
return (content, error)
self.patched_funcs.enter_context(
mock.patch("cloudinit.dmi.subp.subp", side_effect=_kenv_subp)
)
def patch_mapping(self, new_mapping):
self.patched_funcs.enter_context(
mock.patch("cloudinit.dmi.DMIDECODE_TO_KERNEL", new_mapping)
)
def test_sysfs_used_with_key_in_mapping_and_file_on_disk(self):
self.patch_mapping(
{"mapped-key": dmi.KernelNames("mapped-value", None)}
)
expected_dmi_value = "sys-used-correctly"
self._create_sysfs_file("mapped-value", expected_dmi_value)
self._configure_dmidecode_return("mapped-key", "wrong-wrong-wrong")
self.assertEqual(expected_dmi_value, dmi.read_dmi_data("mapped-key"))
def test_dmidecode_used_if_no_sysfs_file_on_disk(self):
self.patch_mapping({})
self._create_sysfs_parent_directory()
expected_dmi_value = "dmidecode-used"
self._configure_dmidecode_return("use-dmidecode", expected_dmi_value)
with mock.patch("cloudinit.util.os.uname") as m_uname:
m_uname.return_value = (
"x-sysname",
"x-nodename",
"x-release",
"x-version",
"x86_64",
)
self.assertEqual(
expected_dmi_value, dmi.read_dmi_data("use-dmidecode")
)
def test_dmidecode_not_used_on_arm(self):
self.patch_mapping({})
print("current =%s", subp)
self._create_sysfs_parent_directory()
dmi_val = "from-dmidecode"
dmi_name = "use-dmidecode"
self._configure_dmidecode_return(dmi_name, dmi_val)
print("now =%s", subp)
expected = {"armel": None, "aarch64": dmi_val, "x86_64": dmi_val}
found = {}
# we do not run the 'dmi-decode' binary on some arches
# verify that anything requested that is not in the sysfs dir
# will return None on those arches.
with mock.patch("cloudinit.util.os.uname") as m_uname:
for arch in expected:
m_uname.return_value = (
"x-sysname",
"x-nodename",
"x-release",
"x-version",
arch,
)
print("now2 =%s", subp)
found[arch] = dmi.read_dmi_data(dmi_name)
self.assertEqual(expected, found)
def test_none_returned_if_neither_source_has_data(self):
self.patch_mapping({})
self._configure_dmidecode_return("key", "value")
self.assertIsNone(dmi.read_dmi_data("expect-fail"))
def test_none_returned_if_dmidecode_not_in_path(self):
self.patched_funcs.enter_context(
mock.patch.object(subp, "which", lambda _: False)
)
self.patch_mapping({})
self.assertIsNone(dmi.read_dmi_data("expect-fail"))
def test_empty_string_returned_instead_of_foxfox(self):
# uninitialized dmi values show as \xff, return empty string
my_len = 32
dmi_value = b"\xff" * my_len + b"\n"
expected = ""
dmi_key = "system-product-name"
sysfs_key = "product_name"
self._create_sysfs_file(sysfs_key, dmi_value)
self.assertEqual(expected, dmi.read_dmi_data(dmi_key))
def test_container_returns_none(self):
"""In a container read_dmi_data should always return None."""
# first verify we get the value if not in container
self._m_is_container.return_value = False
key, val = ("system-product-name", "my_product")
self._create_sysfs_file("product_name", val)
self.assertEqual(val, dmi.read_dmi_data(key))
# then verify in container returns None
self._m_is_container.return_value = True
self.assertIsNone(dmi.read_dmi_data(key))
def test_container_returns_none_on_unknown(self):
"""In a container even bogus keys return None."""
self._m_is_container.return_value = True
self._create_sysfs_file("product_name", "should-be-ignored")
self.assertIsNone(dmi.read_dmi_data("bogus"))
self.assertIsNone(dmi.read_dmi_data("system-product-name"))
def test_freebsd_uses_kenv(self):
"""On a FreeBSD system, kenv is called."""
self._m_is_FreeBSD.return_value = True
key, val = ("system-product-name", "my_product")
self._configure_kenv_return(key, val)
self.assertEqual(dmi.read_dmi_data(key), val)
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