$ git clone -n https://src.fedoraproject.org/rpms/maven-wagon.git /var/lib/mock/f42-build-3347438-45004/root/chroot_tmpdir/scmroot/maven-wagon
Cloning into '/var/lib/mock/f42-build-3347438-45004/root/chroot_tmpdir/scmroot/maven-wagon'...
$ git fetch origin 25a594389e99e437748a87e7df82082ebb690dea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-wagon
 * [new ref]         25a594389e99e437748a87e7df82082ebb690dea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25a5943 Remove javadoc subpackage