$ git clone -n https://github.com/xcp-ng-rpms/edk2 /var/lib/mock/v8.3-incoming-9000-27901/root/chroot_tmpdir/scmroot/edk2
Cloning into '/var/lib/mock/v8.3-incoming-9000-27901/root/chroot_tmpdir/scmroot/edk2'...
$ git fetch origin e3f2334ee5963e7664349281ea02d548acf77ac0:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/edk2
 * [new ref]         e3f2334ee5963e7664349281ea02d548acf77ac0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e3f2334 Merge branch 'XS-8.3' into 8.3