$ git clone -n https://src.fedoraproject.org/rpms/plasma-oxygen.git /var/lib/mock/f41-build-side-1-2753492-31224/root/chroot_tmpdir/scmroot/plasma-oxygen
Cloning into '/var/lib/mock/f41-build-side-1-2753492-31224/root/chroot_tmpdir/scmroot/plasma-oxygen'...
$ git fetch origin 5d78a2ec8b6e9644fe922841e1d953ee4a6f8cbb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-oxygen
 * [new ref]         5d78a2ec8b6e9644fe922841e1d953ee4a6f8cbb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5d78a2e 6.1.90