Resolves #260, #301 and #449

Adds ~ support and ro mode support for volumes, along with some additional validation.

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

tests/unit/service_test.py

@@ -1,8 +1,18 @@
 from __future__ import unicode_literals
 from __future__ import absolute_import
+import os
+
 from .. import unittest
+import mock
+
 from fig import Service
-from fig.service import ConfigError, split_port
+from fig.service import (
+    ConfigError,
+    split_port,
+    parse_volume_spec,
+    build_volume_binding,
+)
+
 
 class ServiceTest(unittest.TestCase):
     def test_name_validations(self):
@@ -82,3 +92,46 @@ class ServiceTest(unittest.TestCase):
         opts = service._get_container_create_options({})
         self.assertEqual(opts['hostname'], 'name.sub', 'hostname')
         self.assertEqual(opts['domainname'], 'domain.tld', 'domainname')
+
+
+class ServiceVolumesTest(unittest.TestCase):
+
+    def test_parse_volume_spec_only_one_path(self):
+        spec = parse_volume_spec('/the/volume')
+        self.assertEqual(spec, (None, '/the/volume', 'rw'))
+
+    def test_parse_volume_spec_internal_and_external(self):
+        spec = parse_volume_spec('external:interval')
+        self.assertEqual(spec, ('external', 'interval', 'rw'))
+
+    def test_parse_volume_spec_with_mode(self):
+        spec = parse_volume_spec('external:interval:ro')
+        self.assertEqual(spec, ('external', 'interval', 'ro'))
+
+    def test_parse_volume_spec_too_many_parts(self):
+        with self.assertRaises(ConfigError):
+            parse_volume_spec('one:two:three:four')
+
+    def test_parse_volume_bad_mode(self):
+        with self.assertRaises(ConfigError):
+            parse_volume_spec('one:two:notrw')
+
+    def test_build_volume_binding(self):
+        binding = build_volume_binding(parse_volume_spec('/outside:/inside'))
+        self.assertEqual(
+            binding,
+            ('/outside', dict(bind='/inside', ro=False)))
+
+    @mock.patch.dict(os.environ)
+    def test_build_volume_binding_with_environ(self):
+        os.environ['VOLUME_PATH'] = '/opt'
+        binding = build_volume_binding(parse_volume_spec('${VOLUME_PATH}:/opt'))
+        self.assertEqual(binding, ('/opt', dict(bind='/opt', ro=False)))
+
+    @mock.patch.dict(os.environ)
+    def test_building_volume_binding_with_home(self):
+        os.environ['HOME'] = '/home/user'
+        binding = build_volume_binding(parse_volume_spec('~:/home/user'))
+        self.assertEqual(
+            binding,
+            ('/home/user', dict(bind='/home/user', ro=False)))