report reboot for new kernels (#83)

This compares `uname -r` to the directories in /lib/modules/, if a directory name in /lib/modules/ is bigger than `uname -r` a fake `AffectedApplication` is added for it.

tracer/resources/tracer.py

@@ -18,13 +18,16 @@
 
 from __future__ import absolute_import
 
+import os
+from distutils.version import LooseVersion
 from psutil import NoSuchProcess
 from tracer.resources.system import System
 from tracer.resources.FilenameCleaner import FilenameCleaner
 from tracer.resources.processes import AffectedProcess
 from tracer.resources.collections import ApplicationsCollection, AffectedProcessesCollection, PackagesCollection
 from tracer.resources.exceptions import UnsupportedDistribution
 from tracer.resources.applications import Applications, AffectedApplication
+from tracer.resources.lang import _
 
 
 class Tracer(object):
@@ -119,9 +122,19 @@ def trace_affected(self, user=None):
 								affected[a.name].affected_instances.append(p)
 					except NoSuchProcess:
 						pass
+		if self._has_updated_kernel() and not self._applications.find('kernel').ignore:
+			# Add fake AffectedApplication
+			affected['kernel'] = AffectedApplication({"name": "kernel", "type": Applications.TYPES["STATIC"],
+									"helper": _("You will have to reboot your computer")})
 
 		return ApplicationsCollection(affected.values())
 
+	def _has_updated_kernel(self):
+		for k_version in next(os.walk('/lib/modules/'))[1]:
+			if LooseVersion(os.uname()[2]) < LooseVersion(k_version):
+				return True
+		return False
+
 	def _apply_rules(self, process):
 		parent = process.parent()
 		if not parent: