$ git clone -n https://src.fedoraproject.org/rpms/gnome-maps.git /var/lib/mock/f45-build-11445-430/root/chroot_tmpdir/scmroot/gnome-maps
Cloning into '/var/lib/mock/f45-build-11445-430/root/chroot_tmpdir/scmroot/gnome-maps'...
$ git fetch origin 6045e1c877042bdcf882c663a7899bebd63ab5db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-maps
 * [new ref]         6045e1c877042bdcf882c663a7899bebd63ab5db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6045e1c Update to 51.0