$ git clone -n https://src.fedoraproject.org/rpms/oxygen-sounds.git /var/lib/mock/f41-build-side-1-3066476-38685/root/chroot_tmpdir/scmroot/oxygen-sounds
Cloning into '/var/lib/mock/f41-build-side-1-3066476-38685/root/chroot_tmpdir/scmroot/oxygen-sounds'...
$ git fetch origin 770a50b30d8921a968b4ba3b1005e3624c496a4c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/oxygen-sounds
 * [new ref]         770a50b30d8921a968b4ba3b1005e3624c496a4c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 770a50b 6.2.3