$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9760-28470/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9760-28470/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin efecc0a91aadf60f0ba04e43743b61774ebd35a7:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         efecc0a91aadf60f0ba04e43743b61774ebd35a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at efecc0a bump release for test build