$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10510-29065/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10510-29065/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 16893967c73bb8c1b640746e464f916ee3ae10a3:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         16893967c73bb8c1b640746e464f916ee3ae10a3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1689396 bump release for test build