$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9418-28159/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9418-28159/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 4b533506e81364ad16779434602a71f7285833a5:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         4b533506e81364ad16779434602a71f7285833a5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b53350 bump release for test build