$ git clone -n https://github.com/xcp-ng-rpms/kernel /var/lib/mock/v9.0-u-ydi1-11187-29583/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v9.0-u-ydi1-11187-29583/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 00a12624312b1136cd939abe87747b0cd636933c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             00a12624312b1136cd939abe87747b0cd636933c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 00a126243 bump release for test build