$ git clone -n https://github.com/xcp-ng-rpms/kernel /var/lib/mock/v9.0-u-ydi1-11205-29591/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v9.0-u-ydi1-11205-29591/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 25a4293e9f2d61d522bd91ebdb2005015aa80bfb:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             25a4293e9f2d61d522bd91ebdb2005015aa80bfb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 25a4293e9 bump release for test build