$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10942-29411/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10942-29411/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 28fa1ab0346f5a290a96d99a864a5b17d6b62670:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         28fa1ab0346f5a290a96d99a864a5b17d6b62670 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 28fa1ab bump release for test build