$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f42-bootstrap-3533729-46421/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f42-bootstrap-3533729-46421/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin 1675afb9138419a667ff266ee0d336b5de3528ec:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         1675afb9138419a667ff266ee0d336b5de3528ec -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1675afb 6.3.5