$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.3-u-qcasasnovas1-10271-28849/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.3-u-qcasasnovas1-10271-28849/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 8baada0444a0d41be2217fa42bf154e306d55729:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             8baada0444a0d41be2217fa42bf154e306d55729 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8baada044 bump release for test build