$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.3-incoming-8906-27862/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.3-incoming-8906-27862/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin e2385edb08343adc0ca38ce5232d123f3ff16a30:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             e2385edb08343adc0ca38ce5232d123f3ff16a30 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2385edb0 Backport patch for CVE-2020-28374