diff --git a/code/client/makepkginfo b/code/client/makepkginfo
index ef586010..2027ab0b 100755
--- a/code/client/makepkginfo
+++ b/code/client/makepkginfo
@@ -55,8 +55,8 @@ def getCatalogInfoFromDmg(dmgpath, options):
     To-do: handle multiple installer items on a disk image(?)
     """
     cataloginfo = None
-    dmgWasAlreadyMounted = munkicommon.dmgIsMounted(dmgpath)
-    mountpoints = munkicommon.mountdmg(dmgpath)
+    dmgWasAlreadyMounted = munkicommon.diskImageIsMounted(dmgpath)
+    mountpoints = munkicommon.mountdmg(dmgpath, use_existing_mounts=True)
     if not mountpoints:
         print >> sys.stderr, "Could not mount %s!" % dmgpath
         exit(-1)
@@ -701,10 +701,10 @@ def main():
         if item and os.path.exists(item):
             
             # Check if the item is a mount point for a disk image
-            if munkicommon.dmgForMountPoint(item):
+            if munkicommon.pathIsVolumeMountPoint(item):
                 # Get the disk image path for the mount point
                 # and use that instead of the original item
-                item = munkicommon.dmgForMountPoint(item)
+                item = munkicommon.diskImageForMountPoint(item)
             
             # get size of installer item
             itemsize = 0 
diff --git a/code/client/munkilib/munkicommon.py b/code/client/munkilib/munkicommon.py
index 6cc56f7d..0bccc282 100755
--- a/code/client/munkilib/munkicommon.py
+++ b/code/client/munkilib/munkicommon.py
@@ -820,6 +820,7 @@ def DMGhasSLA(dmgpath):
 def hdiutilInfo():
     """
     Convenience method for running 'hdiutil info -plist'
+    
     Returns the root object parsed with readPlistFromString()
     """
     proc = subprocess.Popen(
@@ -839,7 +840,7 @@ def hdiutilInfo():
     return None
 
 
-def dmgIsMounted(dmgpath):
+def diskImageIsMounted(dmgpath):
     """
     Returns true if the given disk image is currently mounted
     """
@@ -854,12 +855,32 @@ def dmgIsMounted(dmgpath):
     return isMounted
 
 
-def dmgForMountPoint(path):
+def pathIsVolumeMountPoint(path):
     """
-    Checks if the given file system path 
-    is a mount point for a disk image
+    Checks if the given path is a volume for an attached disk image
     
-    Returns the dmg path or None
+    Returns true if the given path is a mount point or false if it isn't
+    """
+    isMountPoint = False
+    infoplist = hdiutilInfo()
+    for imageProperties in infoplist.get('images'):
+        if 'image-path' in imageProperties:
+            imagepath = imageProperties['image-path']
+            for entity in imageProperties.get('system-entities', []):
+                if 'mount-point' in entity:
+                    mountpoint = entity['mount-point']
+                    if path == mountpoint:
+                        isMountPoint = True
+                        break                
+    return isMountPoint
+
+
+def diskImageForMountPoint(path):
+    """
+    Resolves the given mount point path to an attached disk image path
+    
+    Returns a path to a disk image file or None if the path is not
+    a valid mount point
     """
     dmgpath = None
     infoplist = hdiutilInfo()
@@ -873,7 +894,7 @@ def dmgForMountPoint(path):
                         dmgpath = imagepath
     return dmgpath
 
-def mountPointsForDmg(dmgpath):
+def mountPointsForDiskImage(dmgpath):
     """
     Returns a list of mountpoints for the given disk image
     """