[releng] sigulsign_unsigned: Add details to error message

[Till Maas]

commit dbf026112fd5d339916381d1827490be999dd787
Author: Till Maas <opensource at till.name>
Date:   Sun Oct 26 11:42:39 2014 +0100

    sigulsign_unsigned: Add details to error message

 scripts/sigulsign_unsigned.py |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/scripts/sigulsign_unsigned.py b/scripts/sigulsign_unsigned.py
index ad7cf3f..a49d465 100755
--- a/scripts/sigulsign_unsigned.py
+++ b/scripts/sigulsign_unsigned.py
@@ -357,9 +357,9 @@ class SigulHelper(object):
         self.arch = arch
 
         command = self.build_cmdline('get-public-key', self.key)
-        ret, pubkey = self.run_command(command)[0:2]
+        ret, pubkey, stderr = self.run_command(command)
         if ret != 0:
-            raise ValueError("Invalid key or password")
+            raise ValueError("Invalid key or password: " + stderr)
         self.keyid, self.v3 = get_key_info(pubkey)
 
     def build_cmdline(self, *args):
@@ -487,8 +487,9 @@ if __name__ == "__main__":
                                        config_file=opts.sigul_config_file,
                                        arch=opts.arch, ask=True,
                                        ask_with_agent=opts.gpg_agent)
-        except ValueError:
-            logging.error('Error validating passphrase for key %s' % key)
+        except ValueError as error:
+            logging.error('Error validating passphrase for key %s: %s', key,
+                          error)
             sys.exit(1)
 
     # setup the koji session