$ git clone -n https://src.fedoraproject.org/rpms/tart.git /var/lib/mock/f38-build-side-42-init-devel-1223753-30639/root/chroot_tmpdir/scmroot/tart
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1223753-30639/root/chroot_tmpdir/scmroot/tart'...
$ git fetch origin 85f9f4aa8bbae8ca0325cceb79145eba69e1a08e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tart
 * [new ref]         85f9f4aa8bbae8ca0325cceb79145eba69e1a08e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85f9f4a disable executable for lts-20