$ git clone -n https://github.com/xcp-ng-rpms/mellanox-mlnxen.git /var/lib/mock/v8.3-u-prebuild-9299-28065/root/chroot_tmpdir/scmroot/mellanox-mlnxen
Cloning into '/var/lib/mock/v8.3-u-prebuild-9299-28065/root/chroot_tmpdir/scmroot/mellanox-mlnxen'...
$ git fetch origin 0aa86add3d40294edc6b6411c1746d6e17686183:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/mellanox-mlnxen
 * [new ref]         0aa86add3d40294edc6b6411c1746d6e17686183 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0aa86ad bump release for test build