From 0ef143dbd661a034133413faf9306db9a5494d19 Mon Sep 17 00:00:00 2001
From: Alexander Grund <alexander.grund@tu-dresden.de>
Date: Wed, 17 Dec 2025 12:16:28 +0100
Subject: [PATCH 1/2] Extend list of easyconfig parameters that extensions
 should not inherit

It does not make sense for extensions to inherit source(-likes), patches
or checksums from the parent easyconfig.
Especially the `sources` won't be used anyway, so reset those to the
defaults to avoid confusion.
---
 easybuild/framework/extension.py | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/easybuild/framework/extension.py b/easybuild/framework/extension.py
index 22f2b9f42e..aa61dc8847 100644
--- a/easybuild/framework/extension.py
+++ b/easybuild/framework/extension.py
@@ -38,6 +38,7 @@
 import copy
 import os
 
+from easybuild.framework.easyconfig.default import get_easyconfig_parameter_default
 from easybuild.framework.easyconfig.easyconfig import resolve_template
 from easybuild.framework.easyconfig.templates import TEMPLATE_NAMES_EASYBLOCK_RUN_STEP, template_constant_dict
 from easybuild.tools.build_log import EasyBuildError, EasyBuildExit, raise_nosupport
@@ -107,10 +108,18 @@ def __init__(self, mself, ext, extra_params=None):
 
         name, version = self.ext['name'], self.ext.get('version', None)
 
-        # parent sanity check paths/commands and postinstallcmds are not relevant for extension
-        self.cfg['sanity_check_commands'] = []
-        self.cfg['sanity_check_paths'] = []
-        self.cfg['postinstallcmds'] = []
+        # Reset some options that should not be inherited from the parent
+        restore_options = (
+            'checksums',
+            'data_sources',
+            'patches',
+            'postinstallcmds',
+            'sanity_check_commands',
+            'sanity_check_paths',
+            'sources',
+        )
+        for opt_name in restore_options:
+            self.cfg[opt_name] = get_easyconfig_parameter_default(opt_name)
 
         # construct dict with template values that can be used
         self.cfg.template_values.update(template_constant_dict({'name': name, 'version': version}))

From b76011a5247efd2149c98c923edad1c37411a3b5 Mon Sep 17 00:00:00 2001
From: Alexander Grund <alexander.grund@tu-dresden.de>
Date: Wed, 7 Jan 2026 16:42:18 +0100
Subject: [PATCH 2/2] Also reset `skipsteps`

---
 easybuild/framework/extension.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/easybuild/framework/extension.py b/easybuild/framework/extension.py
index aa61dc8847..39655499fa 100644
--- a/easybuild/framework/extension.py
+++ b/easybuild/framework/extension.py
@@ -116,6 +116,7 @@ def __init__(self, mself, ext, extra_params=None):
             'postinstallcmds',
             'sanity_check_commands',
             'sanity_check_paths',
+            'skipsteps',
             'sources',
         )
         for opt_name in restore_options: