$ git clone -n https://github.com/xcp-ng-rpms/xapi.git /var/lib/mock/v8.3-u-asultanov2-9320-28070/root/chroot_tmpdir/scmroot/xapi
Cloning into '/var/lib/mock/v8.3-u-asultanov2-9320-28070/root/chroot_tmpdir/scmroot/xapi'...
$ git fetch origin 9c648bf739cf873fb499e5a48d39b6eea56f0280:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/xapi
 * [new ref]         9c648bf739cf873fb499e5a48d39b6eea56f0280 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c648bf Backport XSA-474 patch