$ git clone -n https://src.fedoraproject.org/rpms/maven.git /var/lib/mock/f42-build-3367116-45050/root/chroot_tmpdir/scmroot/maven
Cloning into '/var/lib/mock/f42-build-3367116-45050/root/chroot_tmpdir/scmroot/maven'...
$ git fetch origin 0530b9f28efa7fd58e55c0c437e3abc2e2c2d200:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven
 * [new ref]         0530b9f28efa7fd58e55c0c437e3abc2e2c2d200 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0530b9f Remove javadoc subpackage