$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-release /var/lib/mock/v8.3-incoming-9713-28430/root/chroot_tmpdir/scmroot/xcp-ng-release
Cloning into '/var/lib/mock/v8.3-incoming-9713-28430/root/chroot_tmpdir/scmroot/xcp-ng-release'...
$ git fetch origin d6c718e7d04e70dfd740a158f1c75558b99a9f80:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-release
 * [new ref]         d6c718e7d04e70dfd740a158f1c75558b99a9f80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d6c718e Fixup: Add missing entry for patch that fix prompt to spec file