$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-server.git /var/lib/mock/f41-build-side-1-2785980-32602/root/chroot_tmpdir/scmroot/xorg-x11-server
Cloning into '/var/lib/mock/f41-build-side-1-2785980-32602/root/chroot_tmpdir/scmroot/xorg-x11-server'...
$ git fetch origin 083eae606156350e911d9ad663a9219a92dbe363:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-server
 * [new ref]         083eae606156350e911d9ad663a9219a92dbe363 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 083eae6 Obsolete vesa and fbdev drivers