ubuntutools/test: Introduce get_source_files function

The flake8 and pylint unittest use the same logic to determine the source
files. Therefore put this logic in one function.

ubuntutools/test/__init__.py

@@ -17,6 +17,8 @@
 import os
 import sys
 
+import setup
+
 if sys.version_info < (2, 7):
     import unittest2 as unittest
 else:
@@ -28,3 +30,26 @@ def discover():
     __main__ = sys.modules['__main__']
     setupDir = os.path.abspath(os.path.dirname(__main__.__file__))
     return unittest.defaultTestLoader.discover(setupDir)
+
+
+def get_source_files():
+    """Return a list of sources files/directories (to check with flake8/pylint)"""
+    modules = ["ubuntutools"]
+    py_files = ["setup.py"]
+
+    files = []
+    for code_file in setup.scripts + modules + py_files:
+        is_script = code_file in setup.scripts
+        if not os.path.exists(code_file):  # pragma: no cover
+            # The alternative path is needed for Debian's pybuild
+            alternative = os.path.join(os.environ.get("OLDPWD", ""), code_file)
+            code_file = alternative if os.path.exists(alternative) else code_file
+        if is_script:
+            with open(code_file, "rb") as script_file:
+                shebang = script_file.readline().decode("utf-8")
+            if ((sys.version_info[0] == 3 and "python3" in shebang)
+                    or ("python" in shebang and "python3" not in shebang)):
+                files.append(code_file)
+        else:
+            files.append(code_file)
+    return files

ubuntutools/test/test_flake8.py

@@ -17,24 +17,15 @@
 import subprocess
 import sys
 
-import setup
-from ubuntutools.test import unittest
+from ubuntutools.test import get_source_files, unittest
 
 
 class Flake8TestCase(unittest.TestCase):
     def test_flake8(self):
         "Test: Run flake8 on Python source code"
-        files = ['ubuntutools', 'setup.py']
-        for script in setup.scripts:
-            with open(script, 'r') as script_file:
-                shebang = script_file.readline()
-            if ((sys.version_info[0] == 3 and 'python3' in shebang) or
-                    ('python' in shebang and 'python3' not in shebang)):
-                files.append(script)
-
         with open('/proc/self/cmdline', 'r') as cmdline_file:
             python_binary = cmdline_file.read().split('\0')[0]
-        cmd = [python_binary, '-m', 'flake8', '--max-line-length=99'] + files
+        cmd = [python_binary, '-m', 'flake8', '--max-line-length=99'] + get_source_files()
         sys.stderr.write("Running following command:\n{}\n".format(" ".join(cmd)))
         process = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                                    stderr=subprocess.PIPE, close_fds=True)

ubuntutools/test/test_pylint.py

@@ -17,28 +17,19 @@
 
 import sys
 
-import setup
-from ubuntutools.test import unittest
+from ubuntutools.test import get_source_files, unittest
 from ubuntutools import subprocess
 
 
 class PylintTestCase(unittest.TestCase):
     def test_pylint(self):
         "Test: Run pylint on Python source code"
-        files = ['ubuntutools', 'setup.py']
-        for script in setup.scripts:
-            with open(script, 'r') as script_file:
-                shebang = script_file.readline()
-            if ((sys.version_info[0] == 3 and 'python3' in shebang) or
-                    ('python' in shebang and 'python3' not in shebang)):
-                files.append(script)
-
         if sys.version_info[0] == 3:
             pylint_binary = 'pylint3'
         else:
             pylint_binary = 'pylint'
         cmd = [pylint_binary, '--rcfile=ubuntutools/test/pylint.conf', '-E',
-               '--reports=n', '--confidence=HIGH', '--'] + files
+               '--reports=n', '--confidence=HIGH', '--'] + get_source_files()
         sys.stderr.write("Running following command:\n{}\n".format(" ".join(cmd)))
         try:
             subprocess.check_output(cmd, stderr=subprocess.STDOUT)