[container_log] Add rotated logs support

In Kubernetes/OpenShift rotated logs have no symbolic link in
/var/log/containers and they cannot be retrieved using `oc logs` either,
so there is no way to get these rotated logs in a SOS report.

This patch proposes extending the `container_log` plugin to make it also
capable of retrieving rotated logs from `var/log/pods` using a plugin
boolean option called `rotated`.

Closes #3677
Signed-off-by: Gorka Eguileor <[email protected]>

sos/report/plugins/container_log.py

@@ -9,26 +9,37 @@
 # See the LICENSE file in the source distribution for further information.
 
 import os
-from sos.report.plugins import Plugin, IndependentPlugin
+from sos.report.plugins import Plugin, IndependentPlugin, PluginOpt
 
 
 class ContainerLog(Plugin, IndependentPlugin):
 
     short_desc = 'All logs under /var/log/containers'
     plugin_name = 'container_log'
     logdir = '/var/log/containers/'
+    poddir = '/var/log/pods/'
+    rotated_dirs = [poddir + '*/*.log.*', poddir + '*/*/*.log.*']
     files = (logdir, )
 
+    option_list = [
+        PluginOpt('rotated', default=False, val_type=bool,
+                  desc='also get rotated logs from /var/log/pods'),
+    ]
+
     def setup(self):
         if self.get_option('all_logs'):
             self.add_copy_spec(self.logdir)
+            if self.get_option('rotated'):
+                self.add_copy_spec(self.rotated_dirs)
         else:
-            self.collect_subdirs()
+            self.collect_subdirs(self.logdir, '*.log')
+            if self.get_option('rotated'):
+                self.collect_subdirs(self.poddir, '*.log.*')
 
-    def collect_subdirs(self, root=logdir):
+    def collect_subdirs(self, root, glob):
         """Collect *.log files from subdirs of passed root path
         """
         for dir_name, _, _ in os.walk(root):
-            self.add_copy_spec(self.path_join(dir_name, '*.log'))
+            self.add_copy_spec(self.path_join(dir_name, glob))
 
 # vim: set et ts=4 sw=4 :