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Date:      Thu, 18 Oct 2012 10:59:03 +0300
From:      Andriy Gapon <avg@FreeBSD.org>
To:        Alexander Yerenkow <yerenkow@gmail.com>
Cc:        freebsd-current <freebsd-current@FreeBSD.org>
Subject:   Re: A little question about safe mode
Message-ID:  <507FB6C7.50402@FreeBSD.org>
In-Reply-To: <CAPJF9wm-dvUwgQzZzijakD=FBM9HTBQ%2BF4jC510KX%2BUOG-SfgA@mail.gmail.com>
References:  <CAPJF9wm-dvUwgQzZzijakD=FBM9HTBQ%2BF4jC510KX%2BUOG-SfgA@mail.gmail.com>

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First, I see "safe mode" mentioned in the subject, but nowhere in the body of
the message?  So, what's up with the safe mode? :-)

on 18/10/2012 10:35 Alexander Yerenkow said the following:
> Hello there.
> I have problem here, and don't know if it's bug or "feature" :)
> If I prerare boot media (hdd, sd card,usb, etc) with FreeBSD, and NOT
> create there fstab, I see such behavior:
> 
> 1. I need enter manually where from mount root (e.g. ufs:ada0s1a or
> ufs:ada0s1a rw)

This is a feature.
You might want consider using options ROOTDEVNAME in your kernel.

> 2. If I enter ufs:ada0s1a rw - I have / mounted in read-only anyway. <== Is
> this bug?...

It looks like a feature.  The low-level mountroot code always mounts / as r/o.
It's supposed to be later remounted as r/w by rc.d/root script.

> 3. If I try to make it rw, with commands
> mount -o rw -u /dev/ada0s1a /
> there is no errors, but root is still RO.

This sounds like a bug.
Is there anything on the system console?

> 4. I can't umount / remount some elsewhere this disk, just to create fstab
>  (it's already mounted and can't be updated).
> 
> So, is this as-by-design, that you need "any other" media to boot, just to
> create fstab, or there is "rw" mode broken, or I just missed something?
> 
> It's very disappointing to be able boot interactively into system, but have
> no way to "fix" fstab to make it non-interactively bootable :)

You can try to create an md-based filesystem, mount it under /mnt and then
unionfs-mount it over /etc.

-- 
Andriy Gapon



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