$ git clone -n https://src.fedoraproject.org/rpms/build-helper-maven-plugin.git /var/lib/mock/f40-build-2260964-54425/root/chroot_tmpdir/scmroot/build-helper-maven-plugin
Cloning into '/var/lib/mock/f40-build-2260964-54425/root/chroot_tmpdir/scmroot/build-helper-maven-plugin'...
$ git fetch origin 25d6f01970b450f97bdb21f986b919603292832e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/build-helper-maven-plugin
 * [new ref]         25d6f01970b450f97bdb21f986b919603292832e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25d6f01 Update to upstream version 3.5.0