$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f41-build-824040-153990/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f41-build-824040-153990/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin fbf784f42e9bab6ddfce9b62246ed95231f661f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         fbf784f42e9bab6ddfce9b62246ed95231f661f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fbf784f rebuild