$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9823-28534/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9823-28534/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin b52ca62a986d029758ca55c980d34b4280d13db2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         b52ca62a986d029758ca55c980d34b4280d13db2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b52ca62 bump release for test build