$ git clone -n https://src.fedoraproject.org/rpms/libdatachannel.git /var/lib/mock/f45-build-15999-481/root/chroot_tmpdir/scmroot/libdatachannel
Cloning into '/var/lib/mock/f45-build-15999-481/root/chroot_tmpdir/scmroot/libdatachannel'...
$ git fetch origin 6f1524cec7230283f06bc966e8b9dbbc57cd7538:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libdatachannel
 * [new ref]         6f1524cec7230283f06bc966e8b9dbbc57cd7538 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6f1524c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild