commit https://github.com/vim/vim/commit/ca291aec99b60fe81eaab36aa718e51421bb88d5 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Oct 15 19:33:50 2016 +0200 patch 8.0.0038 Problem: OPEN_CHR_FILES not defined for FreeBSD using Debian userland files. Solution: Check for __FreeBSD_kernel__. (James McCoy, closes https://github.com/vim/vim/issues/1166)

" Vim filetype plugin
" Language:	Dockerfile
" Maintainer:   Honza Pokorny <http://honza.ca>
" Last Change:	2014 Aug 29

" Only do this when not done yet for this buffer
if exists("b:did_ftplugin")
  finish
endif

" Don't load another plugin for this buffer
let b:did_ftplugin = 1

let b:undo_ftplugin = "setl commentstring<"

setlocal commentstring=#\ %s