$ git clone -n https://src.fedoraproject.org/rpms/rdesktop.git /var/lib/mock/f45-build-34372-685/root/chroot_tmpdir/scmroot/rdesktop
Cloning into '/var/lib/mock/f45-build-34372-685/root/chroot_tmpdir/scmroot/rdesktop'...
$ git fetch origin 1b1eead4a31d17fde8bb903e987ad5ac412ee522:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rdesktop
 * [new ref]         1b1eead4a31d17fde8bb903e987ad5ac412ee522 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b1eead Fix build with nettle 4.0