$ git clone -n https://src.fedoraproject.org/rpms/plasma-milou.git /var/lib/mock/f40-build-2255781-54264/root/chroot_tmpdir/scmroot/plasma-milou
Cloning into '/var/lib/mock/f40-build-2255781-54264/root/chroot_tmpdir/scmroot/plasma-milou'...
$ git fetch origin b4e3549fab1e028fc0c074078d3159d6c1dee09e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-milou
 * [new ref]         b4e3549fab1e028fc0c074078d3159d6c1dee09e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b4e3549 5.92.0