add an API error type of class to throw

osc/babysitter.py

@@ -62,6 +62,10 @@ def run(prg):
         print >>sys.stderr, 'aborted.'
         return 1
 
+    except oscerr.APIError, e:
+        print >>sys.stderr, 'BuildService API error:', e.msg
+        return 1
+
     except oscerr.UnreadableFile, e:
         print >>sys.stderr, e.msg
         return 1

osc/oscerr.py

@@ -23,6 +23,12 @@ class ConfigError(OscBaseError):
         OscBaseError.__init__(self)
         self.msg = msg
 
+class APIError(OscBaseError):
+    """Exception raised when there is an error in the output from the API"""
+    def __init__(self, msg):
+        OscBaseError.__init__(self)
+        self.msg = msg
+
 class NoConfigfile(OscBaseError):
     """Exception raised when osc's configfile cannot be found"""
     def __init__(self, fname, msg):