$ git clone -n https://github.com/xcp-ng-rpms/kernel.git /var/lib/mock/v8.3-incoming-11421-29736/root/chroot_tmpdir/scmroot/kernel
Cloning into '/var/lib/mock/v8.3-incoming-11421-29736/root/chroot_tmpdir/scmroot/kernel'...
$ git fetch origin 6c547c91bd712fcd93b6c9fe1aabf1363845bbe2:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/kernel
 * [new ref]             6c547c91bd712fcd93b6c9fe1aabf1363845bbe2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c547c91b Revert "Comment out '--fuzz=0' option passed to patch"