$ git clone -n https://src.fedoraproject.org/rpms/plasma-milou.git /var/lib/mock/f40-build-788667-135301/root/chroot_tmpdir/scmroot/plasma-milou
Cloning into '/var/lib/mock/f40-build-788667-135301/root/chroot_tmpdir/scmroot/plasma-milou'...
$ git fetch origin a4963b5fc408667e4097bf841434f6ec4cd0747d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-milou
 * [new ref]         a4963b5fc408667e4097bf841434f6ec4cd0747d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a4963b5 6.0.0