Fix default directories on Linux (#6560)

* fix default directories

* update changelog

CHANGELOG.md

@@ -14,13 +14,14 @@ Certbot adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
-*
+* The default work and log directories have been changed back to
+  /var/lib/letsencrypt and /var/log/letsencrypt respectively.
 
 Despite us having broken lockstep, we are continuing to release new versions of
 all Certbot components during releases for the time being, however, the only
 package with changes other than its version number was:
 
-*
+* certbot
 
 More details about these changes can be found on our GitHub repo.
 

certbot/compat.py

@@ -180,8 +180,8 @@ WINDOWS_DEFAULT_FOLDERS = {
 }
 LINUX_DEFAULT_FOLDERS = {
     'config': '/etc/letsencrypt',
-    'work': '/var/letsencrypt/lib',
+    'work': '/var/lib/letsencrypt',
-    'logs': '/var/letsencrypt/log',
+    'logs': '/var/log/letsencrypt',
 }
 
 def get_default_folder(folder_type):

certbot/tests/cli_test.py

@@ -4,6 +4,7 @@ import unittest
 import os
 import tempfile
 import copy
+import sys
 
 import mock
 import six
@@ -41,6 +42,15 @@ class TestReadFile(TempDirTestCase):
         self.assertEqual(contents, test_contents)
 
 
+class FlagDefaultTest(unittest.TestCase):
+    """Tests cli.flag_default"""
+
+    def test_linux_directories(self):
+        if 'fcntl' in sys.modules:
+            self.assertEqual(cli.flag_default('config_dir'), '/etc/letsencrypt')
+            self.assertEqual(cli.flag_default('work_dir'), '/var/lib/letsencrypt')
+            self.assertEqual(cli.flag_default('logs_dir'), '/var/log/letsencrypt')
+
 
 class ParseTest(unittest.TestCase):  # pylint: disable=too-many-public-methods
     '''Test the cli args entrypoint'''