$ git clone -n https://github.com/xcp-ng-rpms/edk2.git /var/lib/mock/v8.3-incoming-9370-28123/root/chroot_tmpdir/scmroot/edk2
Cloning into '/var/lib/mock/v8.3-incoming-9370-28123/root/chroot_tmpdir/scmroot/edk2'...
$ git fetch origin ef88cb32123c412dc0a40dc9dbbbcac2243b528c:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/edk2
 * [new ref]         ef88cb32123c412dc0a40dc9dbbbcac2243b528c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ef88cb3 Merge pull request #5 from xcp-ng-rpms/8.3-rebase-XS-20220801-1.7.10