--- importer.py	2015-10-25 13:13:45.581617937 +0100
+++ importer_patch.py	2015-10-25 14:02:52.760954580 +0100
@@ -17,4 +17,5 @@
 
 import os
+import subprocess
 import errno
 import tempfile
@@ -72,6 +73,7 @@
         def import_archive(self, cmd):
                 dirname = tempfile.mkdtemp()
-                status = os.system('cd %s; %s "%s"' % (dirname, cmd, self.filename))
-
+                cmd.append(self.filename)
+                status = 1
+                status = subprocess.call(cmd, cwd = dirname)
                 if status != 0:
                         return _('The archive "%s" could not be extracted' % self.filename)
@@ -96,11 +98,14 @@
 
         def import_targz(self):
-                self.import_archive('tar -x --gzip -f')
+                cmd = ['tar','-x','--gzip','-f']
+                self.import_archive(cmd)
 
         def import_tarbz2(self):
-                self.import_archive('tar -x --bzip2 -f')
+                cmd = ['tar','-x','--bzip2','-f']
+                self.import_archive(cmd)
 
         def import_tar(self):
-                self.import_archive('tar -xf')
+                cmd = ['tar','-xf']
+                self.import_archive(cmd)
 
         def run(self):