$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9510-28244/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9510-28244/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin bc708dd84a7c4a1fca686c7b86d8b81aaee59307:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         bc708dd84a7c4a1fca686c7b86d8b81aaee59307 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bc708dd bump release for test build