$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f41-build-1023958-18174/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f41-build-1023958-18174/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 1c397b5e3c19909cf12b7fc19aa46725bc4e3683:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         1c397b5e3c19909cf12b7fc19aa46725bc4e3683 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1c397b5 6.1.0