$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v9.0-u-ydi1-10958-29419/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v9.0-u-ydi1-10958-29419/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 7f9aef58c89f8bec4d914857275bd9431243bec1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         7f9aef58c89f8bec4d914857275bd9431243bec1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7f9aef5 bump release for test build