$ git clone -n https://src.fedoraproject.org/rpms/openchange.git /var/lib/mock/f41-build-855132-167066/root/chroot_tmpdir/scmroot/openchange
Cloning into '/var/lib/mock/f41-build-855132-167066/root/chroot_tmpdir/scmroot/openchange'...
$ git fetch origin 0f473fd387ce796fe48415ada7568b3de2d357b5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/openchange
 * [new ref]         0f473fd387ce796fe48415ada7568b3de2d357b5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0f473fd Rebuilt against new Samba 4.21