$ git clone -n https://src.fedoraproject.org/rpms/xmvn-generator.git /var/lib/mock/f41-build-2410030-25459/root/chroot_tmpdir/scmroot/xmvn-generator
Cloning into '/var/lib/mock/f41-build-2410030-25459/root/chroot_tmpdir/scmroot/xmvn-generator'...
$ git fetch origin f842ac2c33753ff8f0c01089c42c3a96de2fc696:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmvn-generator
 * [new ref]         f842ac2c33753ff8f0c01089c42c3a96de2fc696 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f842ac2 Update to upstream version 1.2.3