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venv/Lib/site-packages/django/db/backends/sqlite3/creation.py

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+import os
+import shutil
+import sys
+from pathlib import Path
+
+from django.db.backends.base.creation import BaseDatabaseCreation
+
+
+class DatabaseCreation(BaseDatabaseCreation):
+
+    @staticmethod
+    def is_in_memory_db(database_name):
+        return not isinstance(database_name, Path) and (
+            database_name == ':memory:' or 'mode=memory' in database_name
+        )
+
+    def _get_test_db_name(self):
+        test_database_name = self.connection.settings_dict['TEST']['NAME'] or ':memory:'
+        if test_database_name == ':memory:':
+            return 'file:memorydb_%s?mode=memory&cache=shared' % self.connection.alias
+        return test_database_name
+
+    def _create_test_db(self, verbosity, autoclobber, keepdb=False):
+        test_database_name = self._get_test_db_name()
+
+        if keepdb:
+            return test_database_name
+        if not self.is_in_memory_db(test_database_name):
+            # Erase the old test database
+            if verbosity >= 1:
+                self.log('Destroying old test database for alias %s...' % (
+                    self._get_database_display_str(verbosity, test_database_name),
+                ))
+            if os.access(test_database_name, os.F_OK):
+                if not autoclobber:
+                    confirm = input(
+                        "Type 'yes' if you would like to try deleting the test "
+                        "database '%s', or 'no' to cancel: " % test_database_name
+                    )
+                if autoclobber or confirm == 'yes':
+                    try:
+                        os.remove(test_database_name)
+                    except Exception as e:
+                        self.log('Got an error deleting the old test database: %s' % e)
+                        sys.exit(2)
+                else:
+                    self.log('Tests cancelled.')
+                    sys.exit(1)
+        return test_database_name
+
+    def get_test_db_clone_settings(self, suffix):
+        orig_settings_dict = self.connection.settings_dict
+        source_database_name = orig_settings_dict['NAME']
+        if self.is_in_memory_db(source_database_name):
+            return orig_settings_dict
+        else:
+            root, ext = os.path.splitext(orig_settings_dict['NAME'])
+            return {**orig_settings_dict, 'NAME': '{}_{}{}'.format(root, suffix, ext)}
+
+    def _clone_test_db(self, suffix, verbosity, keepdb=False):
+        source_database_name = self.connection.settings_dict['NAME']
+        target_database_name = self.get_test_db_clone_settings(suffix)['NAME']
+        # Forking automatically makes a copy of an in-memory database.
+        if not self.is_in_memory_db(source_database_name):
+            # Erase the old test database
+            if os.access(target_database_name, os.F_OK):
+                if keepdb:
+                    return
+                if verbosity >= 1:
+                    self.log('Destroying old test database for alias %s...' % (
+                        self._get_database_display_str(verbosity, target_database_name),
+                    ))
+                try:
+                    os.remove(target_database_name)
+                except Exception as e:
+                    self.log('Got an error deleting the old test database: %s' % e)
+                    sys.exit(2)
+            try:
+                shutil.copy(source_database_name, target_database_name)
+            except Exception as e:
+                self.log('Got an error cloning the test database: %s' % e)
+                sys.exit(2)
+
+    def _destroy_test_db(self, test_database_name, verbosity):
+        if test_database_name and not self.is_in_memory_db(test_database_name):
+            # Remove the SQLite database file
+            os.remove(test_database_name)
+
+    def test_db_signature(self):
+        """
+        Return a tuple that uniquely identifies a test database.
+
+        This takes into account the special cases of ":memory:" and "" for
+        SQLite since the databases will be distinct despite having the same
+        TEST NAME. See https://www.sqlite.org/inmemorydb.html
+        """
+        test_database_name = self._get_test_db_name()
+        sig = [self.connection.settings_dict['NAME']]
+        if self.is_in_memory_db(test_database_name):
+            sig.append(self.connection.alias)
+        else:
+            sig.append(test_database_name)
+        return tuple(sig)