$ git clone -n https://src.fedoraproject.org/rpms/xmlunit.git /var/lib/mock/f42-build-3419531-45162/root/chroot_tmpdir/scmroot/xmlunit
Cloning into '/var/lib/mock/f42-build-3419531-45162/root/chroot_tmpdir/scmroot/xmlunit'...
$ git fetch origin 1b11d124278b1eb3b985179db4aeb247dc8fea16:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmlunit
 * [new ref]         1b11d124278b1eb3b985179db4aeb247dc8fea16 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1b11d12 Remove javadoc subpackage