dhcp: T5846: Refactor and simplify DUID definition

Refactor DUID XML definition in conf-mode to be reusable. Additionally, remove
explicit call to a separate validator `ipv6-duid` and inline the regex into the
XML definition.

(cherry picked from commit 51e7832fc5c88f9956b26157a80947bad4495a4e)

3 files changed, 16 insertions, 39 deletions

diff --git a/interface-definitions/include/interface/dhcpv6-options.xml.i b/interface-definitions/include/interface/dhcpv6-options.xml.i
index 5ca1d525f..cafa03be0 100644
--- a/interface-definitions/include/interface/dhcpv6-options.xml.i
+++ b/interface-definitions/include/interface/dhcpv6-options.xml.i
@@ -4,18 +4,7 @@
     <help>DHCPv6 client settings/options</help>
   </properties>
   <children>
-    <leafNode name="duid">
-      <properties>
-        <help>DHCP unique identifier (DUID) to be sent by dhcpv6 client</help>
-        <valueHelp>
-          <format>duid</format>
-          <description>DHCP unique identifier (DUID)</description>
-        </valueHelp>
-        <constraint>
-          <validator name="ipv6-duid"/>
-        </constraint>
-      </properties>
-    </leafNode>
+    #include <include/duid.xml.i>
     <leafNode name="parameters-only">
       <properties>
         <help>Acquire only config parameters, no address</help>
diff --git a/interface-definitions/include/interface/duid.xml.i b/interface-definitions/include/interface/duid.xml.i
new file mode 100644
index 000000000..4f8988dfa
--- /dev/null
+++ b/interface-definitions/include/interface/duid.xml.i
@@ -0,0 +1,15 @@
+<!-- include start from interface/duid.xml.i -->
+<leafNode name="duid">
+  <properties>
+    <help>DHCP unique identifier (DUID) to be sent by client</help>
+    <valueHelp>
+      <format>duid</format>
+      <description>DHCP unique identifier</description>
+    </valueHelp>
+    <constraint>
+      <regex>([0-9A-Fa-f]{2}:){,127}([0-9A-Fa-f]{2})</regex>
+    </constraint>
+    <constraintErrorMessage>Invalid DUID, must be in the format h[[:h]...]</constraintErrorMessage>
+  </properties>
+</leafNode>
+<!-- include end -->
diff --git a/src/validators/ipv6-duid b/src/validators/ipv6-duid
deleted file mode 100755
index fd4728e50..000000000
--- a/src/validators/ipv6-duid
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/usr/bin/env python3
-#
-# Copyright (C) 2021 VyOS maintainers and contributors
-#
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License version 2 or later as
-# published by the Free Software Foundation.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-import re
-import sys
-
-pattern = "^([0-9A-Fa-f]{2}:){,127}([0-9A-Fa-f]{2})$"
-
-if __name__ == '__main__':
-    if len(sys.argv) != 2:
-        sys.exit(1)
-    if not re.match(pattern, sys.argv[1]):
-        sys.exit(1)
-    sys.exit(0)