$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v9.0-u-ydi1-11203-29590/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v9.0-u-ydi1-11203-29590/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 4045aaa8ffbe45f0bf77ef11019d118792665a29:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         4045aaa8ffbe45f0bf77ef11019d118792665a29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4045aaa bump release for test build