$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10499-29054/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10499-29054/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 6a2efa19ac8557c11593b50df764ff0b2351bb36:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         6a2efa19ac8557c11593b50df764ff0b2351bb36 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a2efa1 bump release for test build