$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9242-28028/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9242-28028/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 604b4bdc2133f577be6a3432fd7e4a9a8d651377:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         604b4bdc2133f577be6a3432fd7e4a9a8d651377 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 604b4bd bump release for test build