$ git clone -n https://src.fedoraproject.org/rpms/slim.git /var/lib/mock/f38-build-side-42-init-devel-888622-28515/root/chroot_tmpdir/scmroot/slim
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-888622-28515/root/chroot_tmpdir/scmroot/slim'...
$ git fetch origin f1e1581396d85e4f1b63581b3b7f7c25d409c408:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/slim
 * [new ref]         f1e1581396d85e4f1b63581b3b7f7c25d409c408 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f1e1581 Initial unretired and updated import of slim