$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v9.0-u-ydi1-10849-29354/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v9.0-u-ydi1-10849-29354/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin d50c50cc2e96c0f81375490dcff7bc42f90c0991:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         d50c50cc2e96c0f81375490dcff7bc42f90c0991 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d50c50c bump release for test build