Fix test_git_hooks.py

build-support/bin/BUILD

@@ -6,6 +6,14 @@ files(
   sources = globs('*.sh'),
 )
 
+# We include this entry, even though the scripts are already covered by individual `python_binary`
+# targets, to ensure that tests are able to treat these files as loose source files, i.e. to avoid
+# stripping the source root from the files.
+files(
+  name = 'python_scripts',
+  sources = globs('*.py'),
+)
+
 python_binary(
   name = 'check_banned_imports',
   source = 'check_banned_imports.py',

tests/python/pants_test/repo_scripts/BUILD

@@ -8,6 +8,6 @@ python_tests(
     'src/python/pants/util:dirutil',
     'tests/python/pants_test/testutils:git_util',
     'build-support/bin:bash_scripts',
-    'build-support/bin:check_header',
+    'build-support/bin:python_scripts',
   ]
 )