$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-10328-28891/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-10328-28891/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 329a1a5b6357b7d5c20c1bbeb1e0bd7cd7c46fb1:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         329a1a5b6357b7d5c20c1bbeb1e0bd7cd7c46fb1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 329a1a5 bump release for test build