Replace external dependency on distutils

Fixes #278

udiskie/mount.py

@@ -2,9 +2,9 @@
 Mount utilities.
 """
 
-from distutils.spawn import find_executable
 from collections import namedtuple
 from functools import partial
+from shutil import which
 import logging
 import os
 
@@ -169,7 +169,7 @@ async def mount(self, device):
         return True
 
     def _check_device_before_mount(self, device):
-        if device.id_type == 'ntfs' and not find_executable('ntfs-3g'):
+        if device.id_type == 'ntfs' and not which('ntfs-3g'):
             self._log.warn(_(
                 "Mounting NTFS device with default driver.\n"
                 "Please install 'ntfs-3g' if you experience problems or the "

udiskie/prompt.py

@@ -5,7 +5,7 @@
 from udiskie.depend import has_Gtk, require_Gtk
 from udiskie.common import is_utf8
 
-from distutils.spawn import find_executable
+from shutil import which
 import getpass
 import logging
 import shlex
@@ -247,7 +247,7 @@ def browser(browser_name='xdg-open'):
     if not browser_name:
         return None
     argv = shlex.split(browser_name)
-    executable = find_executable(argv[0])
+    executable = which(argv[0])
     if executable is None:
         # Why not raise an exception? -I think it is more convenient (for
         # end users) to have a reasonable default, without enforcing it.