feat: add is_symlink() and set_timezone() util functions

tests/test_util.py

@@ -2,7 +2,7 @@
 
 import os
 from unittest import TestCase
-from unittest.mock import MagicMock
+from unittest.mock import MagicMock, patch, call
 
 from wuttamess import util as mod
 
@@ -15,6 +15,21 @@ class TestExists(TestCase):
         c.run.assert_called_once_with('test -e /foo', warn=True)
 
 
+class TestIsSymlink(TestCase):
+
+    def test_yes(self):
+        c = MagicMock()
+        c.run.return_value.failed = False
+        self.assertTrue(mod.is_symlink(c, '/foo'))
+        c.run.assert_called_once_with('test -L "$(echo /foo)"', warn=True)
+
+    def test_no(self):
+        c = MagicMock()
+        c.run.return_value.failed = True
+        self.assertFalse(mod.is_symlink(c, '/foo'))
+        c.run.assert_called_once_with('test -L "$(echo /foo)"', warn=True)
+
+
 class TestMakoRenderer(TestCase):
 
     def test_basic(self):
@@ -24,3 +39,26 @@ class TestMakoRenderer(TestCase):
         path = os.path.join(here, 'files', 'bar', 'baz')
         rendered = renderer(path, vars={})
         self.assertEqual(rendered, 'machine_is_live = True')
+
+
+class TestSetTimezone(TestCase):
+
+    def test_symlink(self):
+        c = MagicMock()
+        with patch.object(mod, 'is_symlink') as is_symlink:
+            is_symlink.return_value = True
+            mod.set_timezone(c, 'America/Chicago')
+            c.run.assert_has_calls([
+                call("bash -c 'echo America/Chicago > /etc/timezone'"),
+            ])
+            c.run.assert_called_with('ln -sf /usr/share/zoneinfo/America/Chicago /etc/localtime')
+
+    def test_not_symlink(self):
+        c = MagicMock()
+        with patch.object(mod, 'is_symlink') as is_symlink:
+            is_symlink.return_value = False
+            mod.set_timezone(c, 'America/Chicago')
+            c.run.assert_has_calls([
+                call("bash -c 'echo America/Chicago > /etc/timezone'"),
+            ])
+            c.run.assert_called_with('cp /usr/share/zoneinfo/America/Chicago /etc/localtime')