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Date: Tue, 2 Aug 2005 15:19:53 +0900
From: YONETANI Tomokazu <qhwt+fbsd@les.ath.cx>
To: diz@linuxpowered.com
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Cc: freebsd-hackers@freebsd.org
Subject: Re: [patch] rc.d/tmp (silly mkdir usage)
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On Mon, Aug 01, 2005 at 11:37:05PM -0500, diz@linuxpowered.com wrote:
> I'm sorry for the previous patch, so here is at least one item that really
> bugs me that isn't obfuscation. In short, I don't see any reason to fork
> some process to simply "touch" a file (is a filesystem writable) when
> built-in shell i/o does this:
> 
> --- /etc/rc.d/tmp.orig  Mon Aug  1 23:20:24 2005
> +++ /etc/rc.d/tmp       Mon Aug  1 23:22:07 2005
> @@ -48,8 +48,8 @@
>  [Nn][Oo])
>         ;;
>  *)
> -       if (/bin/mkdir -p /tmp/.diskless 2> /dev/null); then
> -               rmdir /tmp/.diskless
> +       if ( > /tmp/.diskless 2> /dev/null); then
> +               rm /tmp/.diskless
>         else
>                 if [ -h /tmp ]; then
>                         echo "*** /tmp is a symlink to a non-writable area!"
> 

Try this as a non-root user, reboot the system and see what happens:
$ ln -s /bin/rm /tmp/.diskless