chroot/base: Create chroot indicator file for use with boot-deploy

chroot/base.py

@@ -48,6 +48,19 @@ class BaseChroot(Chroot):
         )
         if result.returncode != 0:
             raise Exception(f'Failed to initialize chroot "{self.name}"')
+
+        # This indicator is used to prevent boot-deploy from flashing aboot.img after creation
+        logging.info('Creating chroot indicator file')
+
+        result = run_root_cmd(
+            [
+                'touch',
+                f'{self.path}/in-kupferbootstrap',
+            ],
+            stderr=sys.stdout,
+        )
+        if result.returncode != 0:
+            raise Exception('Failed to create chroot indicator file')
         self.initialized = True