Refs #32144 -- Made makemessages remove temporary files on preprocessing error.

Co-authored-by: Anders Hovmöller <anders.hovmoller@dryft.se>

django/core/management/commands/makemessages.py

@@ -527,6 +527,11 @@ class Command(BaseCommand):
                     )
                 )
                 continue
+            except BaseException:
+                # Cleanup before exit.
+                for build_file in build_files:
+                    build_file.cleanup()
+                raise
             build_files.append(build_file)
 
         if self.domain == 'djangojs':

tests/i18n/commands/templates/template_0_with_no_error.tpl

@@ -0,0 +1,6 @@
+{% load i18n %}
+{% blocktranslate %}Hello{% endblocktranslate %}
+
+This file has a name that should be lexicographically before
+'template_with_error.tpl' so that we can test the cleanup case
+of the first file being successful, but the second failing.

tests/i18n/test_extraction.py

@@ -226,8 +226,9 @@ class BasicExtractorTests(ExtractorTests):
         )
         with self.assertRaisesMessage(SyntaxError, msg):
             management.call_command('makemessages', locale=[LOCALE], extensions=['tpl'], verbosity=0)
-        # The temporary file was cleaned up
+        # The temporary files were cleaned up.
         self.assertFalse(os.path.exists('./templates/template_with_error.tpl.py'))
+        self.assertFalse(os.path.exists('./templates/template_0_with_no_error.tpl.py'))
 
     def test_unicode_decode_error(self):
         shutil.copyfile('./not_utf8.sample', './not_utf8.txt')