diff --git a/builder/kojid b/builder/kojid
index 938d2d93..3ea7aa7e 100755
--- a/builder/kojid
+++ b/builder/kojid
@@ -47,7 +47,6 @@ import grp
 import random
 import re
 import rpm
-import rpmUtils.arch
 import shutil
 import signal
 import smtplib
@@ -64,11 +63,18 @@ from six.moves.configparser import ConfigParser
 from fnmatch import fnmatch
 from gzip import GzipFile
 from optparse import OptionParser, SUPPRESS_HELP
-from yum import repoMDObject
-import yum.packages
-import yum.Errors
 
-#imports for LiveCD, LiveMedia, and Appliance handler
+try:
+    # yum
+    import rpmUtils.arch
+    from yum import repoMDObject
+    import yum.packages
+    import yum.Errors
+    yum_available = True
+except ImportError:
+    yum_available = False
+
+# imports for LiveCD, LiveMedia, and Appliance handler
 image_enabled = False
 try:
     import pykickstart.parser as ksparser
diff --git a/koji/daemon.py b/koji/daemon.py
index 7d6b4ddd..223cfad6 100644
--- a/koji/daemon.py
+++ b/koji/daemon.py
@@ -31,7 +31,6 @@ from koji.util import md5_constructor, adler32_constructor, parseStatus, \
 import os
 import signal
 import logging
-from six.moves import urllib
 from fnmatch import fnmatch
 import base64
 import time
@@ -40,6 +39,7 @@ import sys
 import traceback
 import errno
 from six.moves import range
+from six.moves import urllib
 import six
 
 
@@ -588,7 +588,7 @@ class TaskManager(object):
 
     def shutdown(self):
         """Attempt to shut down cleanly"""
-        for task_id in self.pids.keys():
+        for task_id in self.pids:
             self.cleanupTask(task_id)
         self.session.host.freeTasks(to_list(self.tasks.keys()))
         self.session.host.updateHost(task_load=0.0, ready=False)
@@ -628,7 +628,7 @@ class TaskManager(object):
             return
         local_br = self._scanLocalBuildroots()
         # get info on local_only buildroots (most likely expired)
-        local_only = [id for id in six.iterkeys(local_br) if id not in db_br]
+        local_only = [id for id in local_br if id not in db_br]
         if local_only:
             missed_br = self.session.listBuildroots(buildrootID=tuple(local_only))
             #get all the task info in one call
@@ -860,7 +860,7 @@ class TaskManager(object):
             # Note: we may still take an assigned task below
         #sort available capacities for each of our bins
         avail = {}
-        for bin in six.iterkeys(bins):
+        for bin in bins:
             avail[bin] = [host['capacity'] - host['task_load'] for host in bin_hosts[bin]]
             avail[bin].sort()
             avail[bin].reverse()
diff --git a/koji/tasks.py b/koji/tasks.py
index 32397d55..5194190f 100644
--- a/koji/tasks.py
+++ b/koji/tasks.py
@@ -19,21 +19,24 @@
 # Authors:
 #       Mike McLean <mikem@redhat.com>
 #       Mike Bonnet <mikeb@redhat.com>
-
 from __future__ import absolute_import
+
+import logging
+import os
+import pprint
+import random
+import shutil
+import signal
+import time
+
+import six.moves.xmlrpc_client
+import six.moves.urllib.request
+from six.moves import range
+
 import koji
 import koji.plugin
 import koji.util
-import os
-import logging
-import six.moves.xmlrpc_client
-import signal
-import shutil
-import random
-import time
-import pprint
-import six.moves.urllib.request
-from six.moves import range
+
 
 def scan_mounts(topdir):
     """Search path for mountpoints"""
diff --git a/plugins/builder/runroot.py b/plugins/builder/runroot.py
index f2f0bffd..23eb507b 100644
--- a/plugins/builder/runroot.py
+++ b/plugins/builder/runroot.py
@@ -7,6 +7,7 @@ import six.moves.configparser
 import os
 import platform
 import re
+import subprocess
 
 import koji.tasks
 from koji.tasks import scan_mounts
@@ -304,8 +305,10 @@ class RunRootTask(koji.tasks.BaseTaskHandler):
         failed = []
         self.logger.info("Unmounting (runroot): %s" % mounts)
         for dir in mounts:
-            (rv, output) = commands.getstatusoutput("umount -l '%s'" % dir)
-            if rv != 0:
+            proc = subprocess.Popen(["umount", "-l", dir], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+            if proc.wait() != 0:
+                output = proc.stdout.read()
+                output += proc.stderr.read()
                 failed.append("%s: %s" % (dir, output))
         if failed:
             msg = "Unable to unmount: %s" % ', '.join(failed)