$ git clone -n https://github.com/xcp-ng-rpms/edk2.git /var/lib/mock/v8.3-incoming-10078-28689/root/chroot_tmpdir/scmroot/edk2
Cloning into '/var/lib/mock/v8.3-incoming-10078-28689/root/chroot_tmpdir/scmroot/edk2'...
$ git fetch origin 6377abe22585ba5c69071715867737216e10db31:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/edk2
 * [new ref]         6377abe22585ba5c69071715867737216e10db31 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6377abe Bump vCPU limit to 128 from 96