$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10352-28911/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10352-28911/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin d82940a7a527a59591613b5977e9a71ac59a5e87:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         d82940a7a527a59591613b5977e9a71ac59a5e87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d82940a bump release for test build