$ git clone -n https://github.com/xcp-ng-rpms/xapi /var/lib/mock/v8.3-u-psafont1-10489-29050/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont1-10489-29050/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 9e19cfce4abb2dc8028242b2dd9a50bf0419bc93:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         9e19cfce4abb2dc8028242b2dd9a50bf0419bc93 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e19cfc bump release for test build