$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-server.git /var/lib/mock/f45-build-39019-731/root/chroot_tmpdir/scmroot/xorg-x11-server
Cloning into '/var/lib/mock/f45-build-39019-731/root/chroot_tmpdir/scmroot/xorg-x11-server'...
$ git fetch origin d0f378762ad37261c3f52870f13cd3ca500adb84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-server
 * [new ref]         d0f378762ad37261c3f52870f13cd3ca500adb84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0f3787 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild