$ git clone -n https://src.fedoraproject.org/rpms/xorg-x11-server.git /var/lib/mock/f41-build-side-1-3135089-39766/root/chroot_tmpdir/scmroot/xorg-x11-server
Cloning into '/var/lib/mock/f41-build-side-1-3135089-39766/root/chroot_tmpdir/scmroot/xorg-x11-server'...
$ git fetch origin d53e48508bdc6bf7812d2264fa3cfd6b4163db56:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xorg-x11-server
 * [new ref]         d53e48508bdc6bf7812d2264fa3cfd6b4163db56 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d53e485 Update to v21.1.14