patchtest: Add tests from patchtest oe repo

Copy the core components of the patchtest-oe repo into
meta/lib/patchtest in oe-core.

(From OE-Core rev: 257f64f4e4414b78981104aec132b067beb5a92a)

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/patchtest/tests/test_python_pylint.py

@@ -0,0 +1,61 @@
+# Checks related to the python code done with pylint
+#
+# Copyright (C) 2016 Intel Corporation
+#
+# SPDX-License-Identifier: GPL-2.0
+
+import base
+from data import PatchTestInput
+import pylint.epylint as lint
+
+class PyLint(base.Base):
+    pythonpatches  = []
+    pylint_pretest = {}
+    pylint_test    = {}
+    pylint_options = " -E --disable='E0611, E1101, F0401, E0602' --msg-template='L:{line} F:{module} I:{msg}'"
+
+    @classmethod
+    def setUpClassLocal(cls):
+        # get just those patches touching python files
+        cls.pythonpatches = []
+        for patch in cls.patchset:
+            if patch.path.endswith('.py'):
+                if not patch.is_removed_file:
+                    cls.pythonpatches.append(patch)
+
+    def setUp(self):
+        if self.unidiff_parse_error:
+            self.skip('Python-unidiff parse error')
+        if not PatchTestInput.repo.canbemerged:
+            self.skip('Patch cannot be merged, no reason to execute the test method')
+        if not PyLint.pythonpatches:
+            self.skip('No python related patches, skipping test')
+
+    def pretest_pylint(self):
+        for pythonpatch in self.pythonpatches:
+            if pythonpatch.is_modified_file:
+                (pylint_stdout, pylint_stderr) = lint.py_run(command_options = pythonpatch.path + self.pylint_options, return_std=True)
+                for line in pylint_stdout.readlines():
+                    if not '*' in line:
+                        if line.strip():
+                            self.pylint_pretest[line.strip().split(' ',1)[0]] = line.strip().split(' ',1)[1]
+
+    def test_pylint(self):
+        for pythonpatch in self.pythonpatches:
+            # a condition checking whether a file is renamed or not
+            # unidiff doesn't support this yet
+            if pythonpatch.target_file is not pythonpatch.path:
+                path = pythonpatch.target_file[2:]
+            else:
+                path = pythonpatch.path
+            (pylint_stdout, pylint_stderr) = lint.py_run(command_options = path + self.pylint_options, return_std=True)
+            for line in pylint_stdout.readlines():
+                    if not '*' in line:
+                        if line.strip():
+                            self.pylint_test[line.strip().split(' ',1)[0]] = line.strip().split(' ',1)[1]
+
+        for issue in self.pylint_test:
+             if self.pylint_test[issue] not in self.pylint_pretest.values():
+                 self.fail('Errors in your Python code were encountered',
+                           'Correct the lines introduced by your patch',
+                           data=[('Output', 'Please, fix the listed issues:'), ('', issue + ' ' + self.pylint_test[issue])])