$ git clone -n https://src.fedoraproject.org/rpms/vdr.git /var/lib/mock/f42-build-59090321-6571001/root/chroot_tmpdir/scmroot/vdr
Cloning into '/var/lib/mock/f42-build-59090321-6571001/root/chroot_tmpdir/scmroot/vdr'...
$ git fetch origin 67b8d8740c9a83417eda698536a0065e1c01c7e8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vdr
 * [new ref]         67b8d8740c9a83417eda698536a0065e1c01c7e8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67b8d87 Restore package notes