$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9006-27903/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9006-27903/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 75db43327a492a36405bb4380dbd4d9ef03de981:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         75db43327a492a36405bb4380dbd4d9ef03de981 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75db433 bump release for test build