deps: Survive exceptions from pkg_resources

mopidy/utils/deps.py

@@ -94,16 +94,21 @@ def python_info():
 def pkg_info(project_name=None, include_extras=False):
     if project_name is None:
         project_name = 'Mopidy'
-    distribution = pkg_resources.get_distribution(project_name)
-    extras = include_extras and distribution.extras or []
-    dependencies = [
-        pkg_info(d) for d in distribution.requires(extras)]
-    return {
-        'name': distribution.project_name,
-        'version': distribution.version,
-        'path': distribution.location,
-        'dependencies': dependencies,
-    }
+    try:
+        distribution = pkg_resources.get_distribution(project_name)
+        extras = include_extras and distribution.extras or []
+        dependencies = [
+            pkg_info(d) for d in distribution.requires(extras)]
+        return {
+            'name': project_name,
+            'version': distribution.version,
+            'path': distribution.location,
+            'dependencies': dependencies,
+        }
+    except pkg_resources.ResolutionError:
+        return {
+            'name': project_name,
+        }
 
 
 def gstreamer_info():

tests/utils/deps_test.py

@@ -7,6 +7,7 @@ pygst.require('0.10')
 import gst
 
 import mock
+import pkg_resources
 
 from mopidy.utils import deps
 
@@ -107,3 +108,23 @@ class DepsTest(unittest.TestCase):
         dep_info_setuptools = dep_info_pykka['dependencies'][0]
         self.assertEquals('setuptools', dep_info_setuptools['name'])
         self.assertEquals('0.6', dep_info_setuptools['version'])
+
+    @mock.patch('pkg_resources.get_distribution')
+    def test_pkg_info_for_missing_dist(self, get_distribution_mock):
+        get_distribution_mock.side_effect = pkg_resources.DistributionNotFound
+
+        result = deps.pkg_info()
+
+        self.assertEquals('Mopidy', result['name'])
+        self.assertNotIn('version', result)
+        self.assertNotIn('path', result)
+
+    @mock.patch('pkg_resources.get_distribution')
+    def test_pkg_info_for_wrong_dist_version(self, get_distribution_mock):
+        get_distribution_mock.side_effect = pkg_resources.VersionConflict
+
+        result = deps.pkg_info()
+
+        self.assertEquals('Mopidy', result['name'])
+        self.assertNotIn('version', result)
+        self.assertNotIn('path', result)