$ git clone -n https://src.fedoraproject.org/rpms/xmodmap.git /var/lib/mock/f45-build-38967-730/root/chroot_tmpdir/scmroot/xmodmap
Cloning into '/var/lib/mock/f45-build-38967-730/root/chroot_tmpdir/scmroot/xmodmap'...
$ git fetch origin fb7803313992f75fab87548561dec12bdd2d1e28:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmodmap
 * [new ref]         fb7803313992f75fab87548561dec12bdd2d1e28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb78033 switch from autotools to meson build system