run apt-get clean before creating preos

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>

cdist/preos.py

@@ -162,6 +162,10 @@ cp -L "$src" "$real_dst"
                 fd.write(val)
             os.chmod(filename, stat.S_IRUSR |  stat.S_IXUSR)
 
+    def remove_archives(self, base_dir):
+        cmd = [ "chroot", self.target_dir, "/usr/bin/apt-get", "clean" ]
+        subprocess.check_call(cmd)
+
     def create_kernel(self):
         dst = os.path.join(self.out_dir, "kernel")
         srcglob = glob.glob("%s/boot/vmlinuz-*" % self.target_dir)
@@ -270,6 +274,9 @@ cp -L "$src" "$real_dst"
         if args.config:
             self.config()
 
+        # Cleanup archives before creating any image
+        self.remove_archives()
+
         # Output pxe files
         if args.pxe_boot_dir:
             self.create_pxe(args.pxe_boot_dir)