options: keyboard: T3038: use proper XML <defaultValue> over hardcoded Python value

We should not use hardcoded Python values whenever possible. vyos.xml provides
an abstraction of the XML CLI definitions providing default values from the CLI
specified via the <defaultValue> node.

This increases consistency among all XML/Python wrappers.

Additional small fixes in this commit (besides the bad practice incorporating
unrelated changes into the same commit) contain:

  - Keyboard layout shout be explicitly set for /dev/console
  - Added missing Debian dependency on console-data
  - When looking for a key in a dict, we do not need to specify dict.keys()

3 files changed, 16 insertions, 10 deletions

diff --git a/debian/control b/debian/control
index c5dda7883..a290952a3 100644
--- a/debian/control
+++ b/debian/control
@@ -28,6 +28,7 @@ Depends:
   conntrack,
   conserver-client,
   conserver-server,
+  console-data,
   crda,
   cron,
   dbus,
diff --git a/interface-definitions/system-options.xml.in b/interface-definitions/system-options.xml.in
index fab0c0169..12e4044af 100644
--- a/interface-definitions/system-options.xml.in
+++ b/interface-definitions/system-options.xml.in
@@ -111,6 +111,7 @@
                  <description>Denmark</description>
                </valueHelp>
              </properties>
+             <defaultValue>us</defaultValue>
            </leafNode>
         </children>
       </node>
diff --git a/src/conf_mode/system-options.py b/src/conf_mode/system-options.py
index bf0bd56ec..92d60df1b 100755
--- a/src/conf_mode/system-options.py
+++ b/src/conf_mode/system-options.py
@@ -20,9 +20,11 @@ from netifaces import interfaces
 from sys import exit
 
 from vyos.config import Config
+from vyos.configdict import dict_merge
 from vyos.template import render
 from vyos.util import cmd
 from vyos.validate import is_addr_assigned
+from vyos.xml import defaults
 from vyos import ConfigError
 from vyos import airbag
 airbag.enable()
@@ -38,6 +40,12 @@ def get_config(config=None):
         conf = Config()
     base = ['system', 'options']
     options = conf.get_config_dict(base, key_mangling=('-', '_'), get_first_key=True)
+
+    # We have gathered the dict representation of the CLI, but there are default
+    # options which we need to update into the dictionary retrived.
+    default_values = defaults(base)
+    options = dict_merge(default_values, options)
+
     return options
 
 def verify(options):
@@ -70,7 +78,7 @@ def generate(options):
 
 def apply(options):
     # Beep action
-    if 'beep_if_fully_booted' in options.keys():
+    if 'beep_if_fully_booted' in options:
         cmd('systemctl enable vyos-beep.service')
     else:
         cmd('systemctl disable vyos-beep.service')
@@ -95,7 +103,7 @@ def apply(options):
 
     # Reboot system on kernel panic
     with open('/proc/sys/kernel/panic', 'w') as f:
-        if 'reboot_on_panic' in options.keys():
+        if 'reboot_on_panic' in options:
             f.write('60')
         else:
             f.write('0')
@@ -107,14 +115,10 @@ def apply(options):
     else:
         cmd('systemctl disable tuned.service')
 
-    # Keyboard layout
-    if 'keyboard_layout' in options.keys():
-        try:
-            cmd('loadkeys {}'.format(options['keyboard_layout']))
-        except OSError:
-            raise ConfigError('Dos not possible to set {} as keyboard layout'.format(options['keyboard_layout']))
-    else:
-        cmd('loadkeys us')
+    # Keyboard layout - there will be always the default key inside the dict
+    # but we check for key existence anyway
+    if 'keyboard_layout' in options:
+        cmd('loadkeys -C /dev/console {keyboard_layout}'.format(**options))
 
 if __name__ == '__main__':
     try: