$ git clone -n https://src.fedoraproject.org/rpms/java-1.8.0-openjdk-portable.git /var/lib/mock/f41-build-859469-168696/root/chroot_tmpdir/scmroot/java-1.8.0-openjdk-portable
Cloning into '/var/lib/mock/f41-build-859469-168696/root/chroot_tmpdir/scmroot/java-1.8.0-openjdk-portable'...
$ git fetch origin 18484bfbcb950cc7840ec8a72a742b8e15eb5840:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-1.8.0-openjdk-portable
 * [new ref]         18484bfbcb950cc7840ec8a72a742b8e15eb5840 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 18484bf Merge branch 'rawhide' into f40