$ git clone -n https://src.fedoraproject.org/rpms/xmvn-generator.git /var/lib/mock/f41-build-2048975-25295/root/chroot_tmpdir/scmroot/xmvn-generator
Cloning into '/var/lib/mock/f41-build-2048975-25295/root/chroot_tmpdir/scmroot/xmvn-generator'...
$ git fetch origin 6ab4089984ed0a9cb2c0db3a4327c3bd9aa26b05:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmvn-generator
 * [new ref]         6ab4089984ed0a9cb2c0db3a4327c3bd9aa26b05 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6ab4089 Switch javapackages tests to f41 branch