$ git clone -n https://github.com/xcp-ng-rpms/xcp-ng-pv-tools.git /var/lib/mock/v8.3-incoming-9478-28216/root/chroot_tmpdir/scmroot/xcp-ng-pv-tools
Cloning into '/var/lib/mock/v8.3-incoming-9478-28216/root/chroot_tmpdir/scmroot/xcp-ng-pv-tools'...
$ git fetch origin 94fb5bed449f4d2e8e633b9679855966c65d0591:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xcp-ng-pv-tools
 * [new ref]         94fb5bed449f4d2e8e633b9679855966c65d0591 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 94fb5be Add WinPV 9.0.9137 XenClean and XenBootFix