$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9592-28336/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9592-28336/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin a25386c76566ebdb5991da002197f1f11a4f12eb:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         a25386c76566ebdb5991da002197f1f11a4f12eb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a25386c bump release for test build