Changed check to correct build import dir

hub/kojihub.py

@@ -5195,8 +5195,6 @@ def cg_import(metadata, directory):
     - a filename containing the metadata
     """
 
-    if os.path.lexists(directory):
-        raise koji.GenericError("Destination directory exists: %s" % directory)
     importer = CG_Importer()
     return importer.do_import(metadata, directory)
 
@@ -5227,6 +5225,7 @@ class CG_Importer(object):
 
         self.assert_policy()
         self.set_volume()
+        self.check_build_dir()
 
         koji.plugin.run_callbacks('preImport', type='cg', metadata=metadata,
                 directory=directory)
@@ -5314,6 +5313,13 @@ class CG_Importer(object):
             self.buildinfo['volume_name'] = vol['name']
 
 
+    def check_build_dir(self):
+        """Check that the import directory does not already exist"""
+        path = koji.pathinfo.build(self.buildinfo)
+        if os.path.lexists(path):
+            raise koji.GenericError("Destination directory already exists: %s" % path)
+
+
     def prep_build(self):
         metadata = self.metadata
         buildinfo = get_build(metadata['build'], strict=False)