$ git clone -n https://src.fedoraproject.org/rpms/plasma-milou.git /var/lib/mock/f42-build-862471-170829/root/chroot_tmpdir/scmroot/plasma-milou
Cloning into '/var/lib/mock/f42-build-862471-170829/root/chroot_tmpdir/scmroot/plasma-milou'...
$ git fetch origin 051ab85fe8e27be220a72c344130272e87a80f50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plasma-milou
 * [new ref]         051ab85fe8e27be220a72c344130272e87a80f50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 051ab85 6.2.4