$ git clone -n https://github.com/xcp-ng-rpms/kernel /var/lib/mock/v9.0-u-ydi1-11201-29585/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v9.0-u-ydi1-11201-29585/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 1a8292d3a0834c6523c580fa2942c9102f9d2bf8:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             1a8292d3a0834c6523c580fa2942c9102f9d2bf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1a8292d3a bump release for test build