$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f41-build-side-1-2647687-27310/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f41-build-side-1-2647687-27310/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin 12f1ba0620ef1fcd0c826142e55f76edb02097d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         12f1ba0620ef1fcd0c826142e55f76edb02097d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 12f1ba0 6.1.4