$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-9590-28336/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-9590-28336/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin b7fb80d7ca6be4cb70ddfc0391b13a94ccc41439:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         b7fb80d7ca6be4cb70ddfc0391b13a94ccc41439 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7fb80d bump release for test build