$ git clone -n https://src.fedoraproject.org/rpms/maven-file-management.git /var/lib/mock/f42-build-3348059-45005/root/chroot_tmpdir/scmroot/maven-file-management
Cloning into '/var/lib/mock/f42-build-3348059-45005/root/chroot_tmpdir/scmroot/maven-file-management'...
$ git fetch origin b55cb5e8d66f6e4ceec529633f963706c72a467d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-file-management
 * [new ref]         b55cb5e8d66f6e4ceec529633f963706c72a467d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b55cb5e Fix javadoc obsoletes version