$ git clone -n https://src.fedoraproject.org/rpms/gum.git /var/lib/mock/f45-build-13247-447/root/chroot_tmpdir/scmroot/gum
Cloning into '/var/lib/mock/f45-build-13247-447/root/chroot_tmpdir/scmroot/gum'...
$ git fetch origin fd12fd8896521474d7a7c2d8797a4fcbc4bfdf22:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gum
 * [new ref]         fd12fd8896521474d7a7c2d8797a4fcbc4bfdf22 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fd12fd8 Update to version 2.0.0