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Date:      Mon, 4 Jan 2016 17:41:22 +0000
From:      Colin Percival <cperciva@tarsnap.com>
To:        Warner Losh <imp@bsdimp.com>
Cc:        Warner Losh <imp@freebsd.org>, src-committers <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>
Subject:   Re: svn commit: r293115 - head/etc
Message-ID:  <000001520dbaa813-9130e194-040b-43fb-bca8-ea6d92054d7f-000000@email.amazonses.com>
In-Reply-To: <CANCZdfr=Cffp5N-Q1o2UtNhVvLtOVLZnqh3yzBh3=mX=rzsu0w@mail.gmail.com>
References:  <201601031918.u03JImBs012182@repo.freebsd.org> <000001520d9553a7-b3ef495a-89d6-44ec-91c1-c4f9afc2c55b-000000@email.amazonses.com> <CANCZdfr=Cffp5N-Q1o2UtNhVvLtOVLZnqh3yzBh3=mX=rzsu0w@mail.gmail.com>

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On 01/04/16 09:09, Warner Losh wrote:
> On Mon, Jan 4, 2016 at 10:00 AM, Colin Percival <cperciva@tarsnap.com
> <mailto:cperciva@tarsnap.com>> wrote:
>     On 01/03/16 11:18, Warner Losh wrote:
>     >   Fix the read-only
>     >   root case with horrible kludge of mounting rw removing the files, then
>     >   mounting ro.
> 
>     The solution I intended when I introduced this (and used elsewhere) was to
>     set $firstboot_sentinel in /etc(/defaults)?/rc.conf.  This case is precisely
>     why it's a shell variable, in fact.
> 
> Except that's not exactly useful. NanoBSD boots with no filesystems writable
> that are permanent.  So I could set it to /var/firstboot or something like that,
> and the error would go away. However, that wouldn't solve the problem
> because /var is repopulated from base seed files every boot with NanoBSD
> so we'd get firstboot behavior on every single boot. Or, we could remount
> / rw and remove the file and remount it ro when a read-only root was
> requested.

Huh, ok.  I assumed that you had a /conf/ or something like that for storing
persistent configuration data.

> I wondered to myself why we didn't use the same mechanism as nextboot
> for this feature. Do you know?

Doesn't that still write to the filesystem?

-- 
Colin Percival
Security Officer Emeritus, FreeBSD | The power to serve
Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid



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