$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9685-28406/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9685-28406/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 0750d7662a1a54651bc7434a0fca932cede8e9d6:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         0750d7662a1a54651bc7434a0fca932cede8e9d6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0750d76 bump release for test build