$ git clone -n https://src.fedoraproject.org/rpms/kiln.git /var/lib/mock/f40-build-2237398-53541/root/chroot_tmpdir/scmroot/kiln
Cloning into '/var/lib/mock/f40-build-2237398-53541/root/chroot_tmpdir/scmroot/kiln'...
$ git fetch origin 655649ae6742f28a44f21be1da06fc38731e81c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kiln
 * [new ref]         655649ae6742f28a44f21be1da06fc38731e81c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 655649a Remove deprecated %patchN syntax