diff --git a/requirements.txt b/requirements.txt
index ec9286c3..e694e393 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ pre-commit==3.3.3
 pytest==7.4.0
 PyYAML==6.0.1
 yamllint==1.32.0
-gitpython==3.1.32
\ No newline at end of file
+gitpython==3.1.32
+psutil==5.9.5
\ No newline at end of file
diff --git a/tests/definitions_test.py b/tests/definitions_test.py
index 3105c098..650bcf6f 100644
--- a/tests/definitions_test.py
+++ b/tests/definitions_test.py
@@ -1,4 +1,4 @@
-from test_configuration import COMPONENT_TYPES, IMAGE_FILETYPES, SCHEMAS, KNOWN_SLUGS, ROOT_DIR, USE_LOCAL_KNOWN_SLUGS, NETBOX_DT_LIBRARY_URL, KNOWN_MODULES, USE_UPSTREAM_DIFF
+from test_configuration import COMPONENT_TYPES, IMAGE_FILETYPES, SCHEMAS, KNOWN_SLUGS, ROOT_DIR, USE_LOCAL_KNOWN_SLUGS, NETBOX_DT_LIBRARY_URL, KNOWN_MODULES, USE_UPSTREAM_DIFF, PRECOMMIT_ALL_SWITCHES
 import pickle_operations
 from yaml_loader import DecimalSafeLoader
 from device_types import DeviceType, ModuleType, verify_filename, validate_components
@@ -7,6 +7,7 @@ import glob
 import json
 import os
 import tempfile
+import psutil
 from urllib.request import urlopen
 
 import pytest
@@ -105,7 +106,11 @@ def test_environment():
     if definition_files:
         pytest.skip("No changes to definition files found.")
 
-if USE_UPSTREAM_DIFF:
+EVALUATE_ALL = False
+if any(x in PRECOMMIT_ALL_SWITCHES for x in psutil.Process(os.getppid()).cmdline()):
+    EVALUATE_ALL = True
+
+if USE_UPSTREAM_DIFF and not EVALUATE_ALL:
     definition_files = _get_diff_from_upstream()
 else:
     definition_files = _get_definition_files()
@@ -120,6 +125,7 @@ else:
     KNOWN_SLUGS = pickle_operations.read_pickle_data(f'{temp_dir.name}/tests/known-slugs.pickle')
     KNOWN_MODULES = pickle_operations.read_pickle_data(f'{temp_dir.name}/tests/known-modules.pickle')
 
+
 @pytest.mark.parametrize(('file_path', 'schema'), definition_files)
 def test_definitions(file_path, schema):
     """
diff --git a/tests/test_configuration.py b/tests/test_configuration.py
index afae3845..7ef02efe 100644
--- a/tests/test_configuration.py
+++ b/tests/test_configuration.py
@@ -21,6 +21,11 @@ COMPONENT_TYPES = (
     'module-bays',
 )
 
+PRECOMMIT_ALL_SWITCHES = [
+  '-a',
+  '--all-files'
+]
+
 ROOT_DIR = os.path.abspath(os.path.join(os.path.dirname( __file__ ), '..'))
 
 KNOWN_SLUGS = set()