$ git clone -n https://github.com/xcp-ng-rpms/kernel /var/lib/mock/v9.0-u-ydi1-11184-29582/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v9.0-u-ydi1-11184-29582/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin e2d6166e36fbeee3c48b34d5c90bd0c1068137a6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             e2d6166e36fbeee3c48b34d5c90bd0c1068137a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2d6166e3 bump release for test build