$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-11413-29728/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-11413-29728/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin c9b038ee6b26b1bf6965454e1fafc7469e848a28:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         c9b038ee6b26b1bf6965454e1fafc7469e848a28 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c9b038e bump release for test build