$ git clone -n https://src.fedoraproject.org/rpms/kasts.git /var/lib/mock/f38-build-side-42-init-devel-799771-28104/root/chroot_tmpdir/scmroot/kasts
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-799771-28104/root/chroot_tmpdir/scmroot/kasts'...
$ git fetch origin bc896e2c2d4e21ab0c2dcf7147a7ce1649c4f711:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kasts
 * [new ref]         bc896e2c2d4e21ab0c2dcf7147a7ce1649c4f711 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc896e2 Add new files in %files and sort