Sticky bit unit test (#501)

---------

Co-authored-by: Donny Wong <donnywong@cs.toronto.edu>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: 3 people

server/autotest_server/tests/test_autotest_server.py

@@ -1,7 +1,10 @@
+import subprocess
+
 import pytest
 import fakeredis
 import rq
 import autotest_server
+import os
 
 
 @pytest.fixture
@@ -26,3 +29,22 @@ def fake_redis_db(monkeypatch, fake_job):
 
 def test_redis_connection(fake_redis_conn):
     assert autotest_server.redis_connection() == fake_redis_conn
+
+
+def test_sticky():
+    workers = autotest_server.config["workers"]
+    autotest_worker = workers[0]["user"]
+    autotest_worker_working_dir = f"/home/docker/.autotesting/workers/{autotest_worker}"
+    path = f"{autotest_worker_working_dir}/test_sticky"
+
+    if not os.path.exists(path):
+        mkdir_cmd = f"sudo -u {autotest_worker} mkdir {path}"
+        chmod_cmd = f"sudo -u {autotest_worker} chmod 000 {path}"
+        chmod_sticky_cmd = f"sudo -u {autotest_worker} chmod +t {path}"
+        subprocess.run(mkdir_cmd, shell=True)
+        subprocess.run(chmod_cmd, shell=True)
+        subprocess.run(chmod_sticky_cmd, shell=True)
+
+    autotest_server._clear_working_directory(autotest_worker_working_dir, autotest_worker)
+
+    assert os.path.exists(path) is False