$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9724-28438/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9724-28438/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 3892994cacf12567f5181b9f06951213aa42e754:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         3892994cacf12567f5181b9f06951213aa42e754 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3892994 bump release for test build