[container_log] Add pods 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` to make it also
capable of retrieving logs from `var/log/pods` using a plugin boolean
option called `rotated`.

When retrieving the pods directory, all logs will be retrieved from it
regardless of size, as it is implicit that the intent is to get all
rotated logs.

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

sos/report/plugins/container_log.py

@@ -9,26 +9,45 @@
 # 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/'
     files = (logdir, )
 
+    option_list = [
+        PluginOpt('rotated', default=False, val_type=bool,
+                  desc='get all logs from /var/log/pods regardless of size, '
+                  'which will include all rotated logs'),
+    ]
+
     def setup(self):
+        sizelimit = None
+        # Remove size limit from containers logs when getting rotated, since
+        # they are just symlinks to the pods logs
+        if self.get_option('rotated'):
+            # This should not happen, but better safe than sorry
+            if not os.path.exists(self.poddir):
+                self._log_warn(f"could not find {self.poddir}, skipping it")
+            else:
+                sizelimit = 0
+                self.add_copy_spec(self.poddir, sizelimit=sizelimit)
+
         if self.get_option('all_logs'):
             self.add_copy_spec(self.logdir)
         else:
-            self.collect_subdirs()
+            self.collect_subdirs(sizelimit=sizelimit)
 
-    def collect_subdirs(self, root=logdir):
+    def collect_subdirs(self, root=logdir, sizelimit=None):
         """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, '*.log'),
+                               sizelimit=sizelimit)
 
 # vim: set et ts=4 sw=4 :