$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-psafont2-10940-29409/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-psafont2-10940-29409/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 7e92ca71bc043cd36b1194647befb2e8db24094b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         7e92ca71bc043cd36b1194647befb2e8db24094b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e92ca7 bump release for test build