$ git clone -n https://src.fedoraproject.org/rpms/libplasma.git /var/lib/mock/f40-build-785535-133991/root/chroot_tmpdir/scmroot/libplasma
Cloning into '/var/lib/mock/f40-build-785535-133991/root/chroot_tmpdir/scmroot/libplasma'...
$ git fetch origin 183afb3892b7b30b7a0bf31a493d2db0ef91fe46:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libplasma
 * [new ref]         183afb3892b7b30b7a0bf31a493d2db0ef91fe46 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 183afb3 6.0.0