Tests: added tests for "path" option in isolation/cgroup.

Author: andrey-zelenkov

test/test_python_isolation.py

@@ -1,3 +1,8 @@
+import os
+import re
+import subprocess
+from pathlib import Path
+
 import pytest
 from unit.applications.lang.python import TestApplicationPython
 from unit.option import option
@@ -9,6 +14,23 @@
 class TestPythonIsolation(TestApplicationPython):
     prerequisites = {'modules': {'python': 'any'}, 'features': ['isolation']}
 
+    def get_cgroup(self, app_name):
+        output = subprocess.check_output(
+            ['ps', 'ax', '-o', 'pid', '-o', 'cmd']
+        ).decode()
+
+        pid = re.search(
+            r'(\d+)\s*unit: "' + app_name + '" application', output
+        ).group(1)
+
+        cgroup = '/proc/' + pid + '/cgroup'
+
+        if not os.path.isfile(cgroup):
+            pytest.skip('no cgroup at ' + cgroup)
+
+        with open(cgroup, 'r') as f:
+            return f.read().rstrip()
+
     def test_python_isolation_rootfs(self, is_su, temp_dir):
         isolation_features = option.available['features']['isolation'].keys()
 
@@ -102,3 +124,104 @@ def test_python_isolation_procfs(self, is_su, temp_dir):
         assert (
             self.getjson(url='/?path=/proc/self')['body']['FileExists'] == True
         ), '/proc/self'
+
+    def test_python_isolation_cgroup(self, is_su, temp_dir):
+        if not is_su:
+            pytest.skip('requires root')
+
+        if not 'cgroup' in option.available['features']['isolation']:
+            pytest.skip('cgroup is not supported')
+
+        def set_cgroup_path(path):
+            isolation = {'cgroup': {'path': path}}
+            self.load('empty', processes=1, isolation=isolation)
+
+        set_cgroup_path('scope/python')
+
+        cgroup_rel = Path(self.get_cgroup('empty'))
+        assert cgroup_rel.parts[-2:] == ('scope', 'python'), 'cgroup rel'
+
+        set_cgroup_path('/scope2/python')
+
+        cgroup_abs = Path(self.get_cgroup('empty'))
+        assert cgroup_abs.parts[-2:] == ('scope2', 'python'), 'cgroup abs'
+
+        assert len(cgroup_rel.parts) >= len(cgroup_abs.parts)
+
+    def test_python_isolation_cgroup_two(self, is_su, temp_dir):
+        if not is_su:
+            pytest.skip('requires root')
+
+        if not 'cgroup' in option.available['features']['isolation']:
+            pytest.skip('cgroup is not supported')
+
+        def set_two_cgroup_path(path, path2):
+            script_path = option.test_dir + '/python/empty'
+
+            assert 'success' in self.conf(
+                {
+                    "listeners": {
+                        "*:7080": {"pass": "applications/one"},
+                        "*:7081": {"pass": "applications/two"},
+                    },
+                    "applications": {
+                        "one": {
+                            "type": "python",
+                            "processes": 1,
+                            "path": script_path,
+                            "working_directory": script_path,
+                            "module": "wsgi",
+                            "isolation": {
+                                'cgroup': {'path': path},
+                            },
+                        },
+                        "two": {
+                            "type": "python",
+                            "processes": 1,
+                            "path": script_path,
+                            "working_directory": script_path,
+                            "module": "wsgi",
+                            "isolation": {
+                                'cgroup': {'path': path2},
+                            },
+                        },
+                    },
+                }
+            )
+
+        set_two_cgroup_path('/scope/python', '/scope/python')
+        assert self.get_cgroup('one') == self.get_cgroup('two')
+
+        set_two_cgroup_path('/scope/python', '/scope2/python')
+        assert self.get_cgroup('one') != self.get_cgroup('two')
+
+    def test_python_isolation_cgroup_invalid(self, is_su):
+        if not is_su:
+            pytest.skip('requires root')
+
+        if not 'cgroup' in option.available['features']['isolation']:
+            pytest.skip('cgroup is not supported')
+
+        def check_invalid(path):
+            script_path = option.test_dir + '/python/empty'
+            assert 'error' in self.conf(
+                {
+                    "listeners": {"*:7080": {"pass": "applications/empty"}},
+                    "applications": {
+                        "empty": {
+                            "type": "python",
+                            "processes": {"spare": 0},
+                            "path": script_path,
+                            "working_directory": script_path,
+                            "module": "wsgi",
+                            "isolation": {
+                                'cgroup': {'path': path},
+                            },
+                        }
+                    },
+                }
+            )
+
+        check_invalid('')
+        check_invalid('../scope')
+        check_invalid('scope/../python')