$ git clone -n https://src.fedoraproject.org/rpms/plasma-oxygen.git /var/lib/mock/f39-build-1685775-41079/root/chroot_tmpdir/scmroot/plasma-oxygen
Cloning into '/var/lib/mock/f39-build-1685775-41079/root/chroot_tmpdir/scmroot/plasma-oxygen'...
$ git fetch origin aa5cf54aa30a0c840ab1771e1138ad4f072de24d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-oxygen
 * [new ref]         aa5cf54aa30a0c840ab1771e1138ad4f072de24d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa5cf54 5.27.9