$ git clone -n https://src.fedoraproject.org/rpms/plasma-desktop.git /var/lib/mock/f40-build-2531736-61830/root/chroot_tmpdir/scmroot/plasma-desktop
Cloning into '/var/lib/mock/f40-build-2531736-61830/root/chroot_tmpdir/scmroot/plasma-desktop'...
$ git fetch origin 1f7d0dfe44faf1099d9feab1c3bbd7252121a68e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-desktop
 * [new ref]         1f7d0dfe44faf1099d9feab1c3bbd7252121a68e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1f7d0df 6.0.1