$ git clone -n https://src.fedoraproject.org/rpms/R-haven.git /var/lib/mock/f38-build-side-42-init-devel-1070885-29784/root/chroot_tmpdir/scmroot/R-haven
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1070885-29784/root/chroot_tmpdir/scmroot/R-haven'...
$ git fetch origin 5658e2dc5f967d780a744f83770e161076443c26:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-haven
 * [new ref]         5658e2dc5f967d780a744f83770e161076443c26 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5658e2d ppc64le is being weird again