diff --git a/client/client.py b/client/client.py
index 1d886aa..49b97d5 100755
--- a/client/client.py
+++ b/client/client.py
@@ -3,8 +3,8 @@
 import argparse
 import fetcher
 import json
+import lib
 import os
-import re
 import socket
 import subprocess
 import time
@@ -58,8 +58,6 @@ FLAGS = parser.parse_args()
 
 class Client(threadedclient.WebSocketClient):
 
-  _VOLUME_ID_REGEX = re.compile(b'^Volume id: (?P<volume_id>.+)$', re.MULTILINE)
-
   def __init__(self, config_path, *args, **kwargs):
     super().__init__(*args, **kwargs)
     with open(config_path, 'r') as fh:
@@ -74,7 +72,7 @@ class Client(threadedclient.WebSocketClient):
         'hostname': socket.gethostname(),
         'uptime_seconds': self._Uptime(),
         'next_timestamp': self._NextTimestamp(),
-        'next_volume_id': self._GetVolumeID('/isodevice/iconograph/current'),
+        'next_volume_id': lib.GetVolumeID('/isodevice/iconograph/current'),
       }
       report.update(self._config)
       self.send(json.dumps({
@@ -91,15 +89,6 @@ class Client(threadedclient.WebSocketClient):
     next_image = os.path.basename(os.readlink('/isodevice/iconograph/current'))
     return int(next_image.split('.', 1)[0])
 
-  def _GetVolumeID(self, path):
-    isoinfo = subprocess.check_output([
-      'isoinfo',
-      '-d',
-      '-i', path,
-    ])
-    match = self._VOLUME_ID_REGEX.search(isoinfo)
-    return match.group('volume_id').decode('ascii')
-
   def _OnImageTypes(self, data):
     assert self._config['image_type'] in data['image_types']
 
diff --git a/client/lib.py b/client/lib.py
new file mode 100644
index 0000000..abffe26
--- /dev/null
+++ b/client/lib.py
@@ -0,0 +1,15 @@
+import re
+import subprocess
+
+
+_VOLUME_ID_REGEX = re.compile(b'^Volume id: (?P<volume_id>.+)$', re.MULTILINE)
+
+
+def GetVolumeID(path):
+  isoinfo = subprocess.check_output([
+    'isoinfo',
+    '-d',
+    '-i', path,
+  ])
+  match = _VOLUME_ID_REGEX.search(isoinfo)
+  return match.group('volume_id').decode('ascii')
diff --git a/client/update_grub.py b/client/update_grub.py
index 94cfbf3..7afcc2d 100755
--- a/client/update_grub.py
+++ b/client/update_grub.py
@@ -1,15 +1,13 @@
 #!/usr/bin/python3
 
+import lib
 import os
-import re
 import string
-import subprocess
 import tempfile
 
 
 class GrubUpdater(object):
 
-  _VOLUME_ID_REGEX = re.compile(b'^Volume id: (?P<volume_id>.+)$', re.MULTILINE)
   _HOTKEYS = string.digits + string.ascii_letters
 
   def __init__(self, image_dir, boot_dir):
@@ -20,15 +18,6 @@ class GrubUpdater(object):
 
     self._image_path = '/' + os.path.relpath(self._image_dir, self._boot_dir)
 
-  def _GetVolumeID(self, path):
-    isoinfo = subprocess.check_output([
-      'isoinfo',
-      '-d',
-      '-i', path,
-    ])
-    match = self._VOLUME_ID_REGEX.search(isoinfo)
-    return match.group('volume_id').decode('ascii')
-
   def Update(self):
     grub_dir = os.path.join(self._boot_dir, 'grub')
 
@@ -63,7 +52,7 @@ menuentry "%(image_filename)s (%(volume_id)s)" --hotkey=%(hotkey)s {
             'image_filename': filename,
             'image_path': self._image_path,
             'hotkey': self._HOTKEYS[i],
-            'volume_id': self._GetVolumeID(os.path.join(self._image_dir, filename)),
+            'volume_id': lib.GetVolumeID(os.path.join(self._image_dir, filename)),
           })
 
         fh.flush()