[PATCH v3 06/12] Recipes.ENRT.ConfigMixins.BaseHWConfigMixin: add _deconfigure_dev_attribute

[Jan Tluka]

This is a deconfig variant of the _configure_dev_attribute() method.
The method restores the original value of a Device attribute based on
the value stored by the _configure_dev_attribute() method.

Signed-off-by: Jan Tluka <jtluka(a)redhat.com&gt;
---
 lnst/Recipes/ENRT/ConfigMixins/BaseHWConfigMixin.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/lnst/Recipes/ENRT/ConfigMixins/BaseHWConfigMixin.py
b/lnst/Recipes/ENRT/ConfigMixins/BaseHWConfigMixin.py
index 29854ee6..c860291c 100644
--- a/lnst/Recipes/ENRT/ConfigMixins/BaseHWConfigMixin.py
+++ b/lnst/Recipes/ENRT/ConfigMixins/BaseHWConfigMixin.py
@@ -17,6 +17,19 @@ class BaseHWConfigMixin(object):
             setattr(dev, attr_name, value)
             attr_cfg[dev]["configured"] = getattr(dev, attr_name)
 
+    def _deconfigure_dev_attribute(self, config, dev_list, attr_name):
+        hw_config = config.hw_config
+
+        try:
+            attr_cfg = hw_config[attr_name + "_configuration"]
+        except KeyError:
+            return
+
+        for dev in dev_list:
+            value = attr_cfg[dev]["original"]
+            setattr(dev, attr_name, value)
+            del attr_cfg[dev]
+
     def _describe_dev_attribute(self, config, attr_name):
         hw_config = config.hw_config
         res = []
-- 
2.21.1