$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9252-28037/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9252-28037/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin a7065c52a99538d1d6f9eec0839a7eb7fe503ead:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         a7065c52a99538d1d6f9eec0839a7eb7fe503ead -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a7065c5 bump release for test build