$ git clone -n https://github.com/xcp-ng-rpms/edk2.git /var/lib/mock/v8.3-incoming-10077-28689/root/chroot_tmpdir/scmroot/edk2
Cloning into '/var/lib/mock/v8.3-incoming-10077-28689/root/chroot_tmpdir/scmroot/edk2'...
$ git fetch origin b357dd97f92c9c8e9ca933218e0ca154a2f7859b:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/edk2
 * [new ref]         b357dd97f92c9c8e9ca933218e0ca154a2f7859b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Filtering content: 100% (4/4)
Filtering content: 100% (4/4), 29.56 MiB | 23.43 MiB/s, done.
HEAD is now at b357dd9 Introduce PVH support