ext,tests: Copy test's output files from /tmp to testing-results

When a test is complete, the output files are in a random folder
in /tmp.

This commit adds a procedure copying those files to
testing-results/SuiteUID/TestUID/ folder, where SuiteUID and
TestUID are the corresponding uid's of the test.

This procedure is triggered after a test is complete and before
the folder in /tmp being removed.

Change-Id: Id960e7f2f1629769008ae99aff4c8bfafa9ca849
Signed-off-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/33998
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>

tests/gem5/fixture.py

@@ -67,6 +67,23 @@ class TempdirFixture(Fixture):
     def setup(self, testitem):
         self.path = tempfile.mkdtemp(prefix='gem5out')
 
+    def post_test_procedure(self, testitem):
+        suiteUID = testitem.metadata.uid.suite
+        testUID = testitem.metadata.name
+        testing_result_folder = os.path.join(config.result_path,
+                                             "SuiteUID:" + suiteUID,
+                                             "TestUID:" + testUID)
+
+        # Copy the output files of the run from /tmp to testing-results
+        # We want to wipe the entire result folder for this test first. Why?
+        #   If the result folder exists (probably from the previous run), if
+        #   this run emits fewer files, there'll be files from the previous
+        #   run in this folder, which would cause confusion if one does not
+        #   check the timestamp of the file.
+        if os.path.exists(testing_result_folder):
+            shutil.rmtree(testing_result_folder)
+        shutil.copytree(self.path, testing_result_folder)
+
     def teardown(self, testitem):
         if testitem.result == Result.Passed:
             shutil.rmtree(self.path)