$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-server.git /var/lib/mock/f41-build-857514-168124/root/chroot_tmpdir/scmroot/xorg-x11-server
Cloning into '/var/lib/mock/f41-build-857514-168124/root/chroot_tmpdir/scmroot/xorg-x11-server'...
$ git fetch origin db932d9182321cb6fa2896b8d9987f1b4dd187b4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-server
 * [new ref]         db932d9182321cb6fa2896b8d9987f1b4dd187b4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at db932d9 Obsolete xorg-x11-drv-armsoc