$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v9.0-u-ydi1-10800-29314/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v9.0-u-ydi1-10800-29314/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin 2c0f5a062c6b38356d8c4a8d2349faf2d9304224:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         2c0f5a062c6b38356d8c4a8d2349faf2d9304224 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2c0f5a0 bump release for test build