$ git clone -n https://src.fedoraproject.org/rpms/gnome-font-viewer.git /var/lib/mock/f45-build-11427-430/root/chroot_tmpdir/scmroot/gnome-font-viewer
Cloning into '/var/lib/mock/f45-build-11427-430/root/chroot_tmpdir/scmroot/gnome-font-viewer'...
$ git fetch origin e3fc438aea26613c2bee7de7f3da2507f850dfbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-font-viewer
 * [new ref]         e3fc438aea26613c2bee7de7f3da2507f850dfbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3fc438 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild