$ git clone -n https://github.com/xcp-ng-rpms/kernel /var/lib/mock/v9.0-u-ydi1-11195-29585/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v9.0-u-ydi1-11195-29585/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin bbf9ae7cb58dc772f70074a84f6e1f32a027e00c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             bbf9ae7cb58dc772f70074a84f6e1f32a027e00c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbf9ae7cb bump release for test build