$ git clone -n https://src.fedoraproject.org/rpms/grantleetheme.git /var/lib/mock/f45-build-12993-444/root/chroot_tmpdir/scmroot/grantleetheme
Cloning into '/var/lib/mock/f45-build-12993-444/root/chroot_tmpdir/scmroot/grantleetheme'...
$ git fetch origin 3834bd959892d7a6433fe85288fb882d38d98702:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grantleetheme
 * [new ref]         3834bd959892d7a6433fe85288fb882d38d98702 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3834bd9 26.08.1