$ git clone -n https://src.fedoraproject.org/rpms/xpra.git /var/lib/mock/f45-build-39060-731/root/chroot_tmpdir/scmroot/xpra
Cloning into '/var/lib/mock/f45-build-39060-731/root/chroot_tmpdir/scmroot/xpra'...
$ git fetch origin 6571640c4e6098947212764d6536af897301a294:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xpra
 * [new ref]         6571640c4e6098947212764d6536af897301a294 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6571640 Release 6.5.4