$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f42-build-862457-170823/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f42-build-862457-170823/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin 49923d705cf733417af636c1bd45271be2ac2a84:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         49923d705cf733417af636c1bd45271be2ac2a84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 49923d7 6.2.4