$ git clone -n https://src.fedoraproject.org/rpms/gtkglext.git /var/lib/mock/f45-build-13193-447/root/chroot_tmpdir/scmroot/gtkglext
Cloning into '/var/lib/mock/f45-build-13193-447/root/chroot_tmpdir/scmroot/gtkglext'...
$ git fetch origin f3b159ae4d6646673227b3b5d984e77d06f08d8e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkglext
 * [new ref]         f3b159ae4d6646673227b3b5d984e77d06f08d8e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f3b159a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild