$ git clone -n https://github.com/xcp-ng-rpms/mellanox-mlnxen.git /var/lib/mock/v8.3-incoming-9361-28117/root/chroot_tmpdir/scmroot/mellanox-mlnxen
Cloning into '/var/lib/mock/v8.3-incoming-9361-28117/root/chroot_tmpdir/scmroot/mellanox-mlnxen'...
$ git fetch origin 113c71dc62ba2f57f9420a0aa262cdde76a9be84:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/mellanox-mlnxen
 * [new ref]         113c71dc62ba2f57f9420a0aa262cdde76a9be84 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 113c71d Merge pull request #1 from xcp-ng-rpms/8.3-import_mellanox-mlnxen-5.9_0.5.5.0-3.xs8.src.rpm