Fix IOError with gnomekeyring.find_network_password_sync

find_network_password_sync throws a gnomekeyring.IOError
when a non-root user tries to run nova client
from a ssh console. If we don't catch this exception nova client
throws the traceback (shown in the bug report) and stops.
If we catch this exception (just like we catch ValueError),
and return None, Nova client executes just fine.

Fixes LP# 1116302

Change-Id: If6937b3f8eafb1dc55224b2ca2bd0f93ae07f8c6

novaclient/shell.py

@@ -33,6 +33,11 @@
 try:
     import keyring
     HAS_KEYRING = True
+    try:
+        if isinstance(keyring.get_keyring(), keyring.backend.GnomeKeyring):
+            _IOError = gnomekeyring.IOError
+    except Exception:
+        _IOError = IOError
 except ImportError:
     pass
 
@@ -146,7 +151,7 @@ def management_url(self):
             block = keyring.get_password('novaclient_auth', self._make_key())
             if block:
                 _token, management_url, _tenant_id = block.split('|', 2)
-        except ValueError:
+        except (_IOError, ValueError):
             pass
         return management_url
 
@@ -163,7 +168,7 @@ def auth_token(self):
             block = keyring.get_password('novaclient_auth', self._make_key())
             if block:
                 token, _management_url, _tenant_id = block.split('|', 2)
-        except ValueError:
+        except (_IOError, ValueError):
             pass
         return token
 
@@ -176,7 +181,7 @@ def tenant_id(self):
             block = keyring.get_password('novaclient_auth', self._make_key())
             if block:
                 _token, _management_url, tenant_id = block.split('|', 2)
-        except ValueError:
+        except (_IOError, ValueError):
             pass
         return tenant_id