def test_start_extension_command_should_add_the_child_process_to_the_extension_cgroup(
self):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
process, extension_cgroups = api.start_extension_command(
extension_name="Microsoft.Compute.TestExtension-1.2.3",
command="date",
shell=False,
cwd=self.tmp_dir,
env={},
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
process.wait()
for cgroup in extension_cgroups:
cgroups_procs_path = os.path.join(cgroup.path, "cgroup.procs")
with open(cgroups_procs_path, "r") as f:
contents = f.read()
pid = int(contents)
self.assertEquals(
pid, process.pid,
"The PID of the command was not added to {0}. Expected: {1}, got: {2}"
.format(cgroups_procs_path, process.pid, pid))
def test_remove_extension_cgroups_should_remove_all_cgroups(self):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
extension_cgroups = api.create_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
api.remove_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
for cgroup in extension_cgroups:
self.assertFalse(os.path.exists(cgroup.path))
def test_get_extension_cgroups_should_return_all_cgroups(self):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
created = api.create_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
retrieved = api.get_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
self.assertEqual(len(retrieved), len(created))
for cgroup in created:
self.assertTrue(any(retrieved_cgroup.path == cgroup.path for retrieved_cgroup in retrieved))
def test_remove_extension_cgroups_should_log_a_warning_when_the_cgroup_contains_active_tasks(self):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
api.create_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
with patch("azurelinuxagent.common.cgroupapi.logger.warn") as mock_logger_warn:
with patch("azurelinuxagent.common.cgroupapi.os.rmdir", side_effect=OSError(16, "Device or resource busy")):
api.remove_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
args, kwargs = mock_logger_warn.call_args
message = args[0]
self.assertIn("still has active tasks", message)
def test_create_extension_cgroups_should_create_cgroups_on_all_controllers(self):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
extension_cgroups = api.create_extension_cgroups("Microsoft.Compute.TestExtension-1.2.3")
def assert_cgroup_created(controller):
cgroup_path = os.path.join(self.cgroups_file_system_root, controller, "walinuxagent.extensions",
"Microsoft.Compute.TestExtension_1.2.3")
self.assertTrue(any(cgroups.path == cgroup_path for cgroups in extension_cgroups))
self.assertTrue(os.path.exists(cgroup_path))
assert_cgroup_created("cpu")
assert_cgroup_created("memory")
def test_start_extension_command_should_add_the_child_process_to_the_extension_cgroup(
self, _):
api = FileSystemCgroupsApi()
api.create_extension_cgroups_root()
with tempfile.TemporaryFile(dir=self.tmp_dir, mode="w+b") as stdout:
with tempfile.TemporaryFile(dir=self.tmp_dir,
mode="w+b") as stderr:
extension_cgroups, process_output = api.start_extension_command(
extension_name="Microsoft.Compute.TestExtension-1.2.3",
command="echo $$",
timeout=300,
shell=True,
cwd=self.tmp_dir,
env={},
stdout=stdout,
stderr=stderr)
# The expected format of the process output is [stdout]\n{PID}\n\n\n[stderr]\n"
pattern = re.compile(r"\[stdout\]\n(\d+)\n\n\n\[stderr\]\n")
m = pattern.match(process_output)
try:
pid_from_output = int(m.group(1))
except Exception as e:
self.fail(
"No PID could be extracted from the process output! Error: {0}"
.format(ustr(e)))
for cgroup in extension_cgroups:
cgroups_procs_path = os.path.join(cgroup.path, "cgroup.procs")
with open(cgroups_procs_path, "r") as f:
contents = f.read()
pid_from_cgroup = int(contents)
self.assertEquals(
pid_from_output, pid_from_cgroup,
"The PID from the process output ({0}) does not match the PID found in the"
"process cgroup {1} ({2})".format(pid_from_output,
cgroups_procs_path,
pid_from_cgroup))