Date: Thu, 18 Oct 2012 12:11:33 +0300 From: Alexander Yerenkow <yerenkow@gmail.com> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-current <freebsd-current@freebsd.org> Subject: Re: A little question about safe mode Message-ID: <CAPJF9wku0MiuLv=s2NG7F3zpKFq94_NcUZ_F9TXhBssWE7bFeg@mail.gmail.com> In-Reply-To: <507FB6C7.50402@FreeBSD.org> References: <CAPJF9wm-dvUwgQzZzijakD=FBM9HTBQ%2BF4jC510KX%2BUOG-SfgA@mail.gmail.com> <507FB6C7.50402@FreeBSD.org>
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2012/10/18 Andriy Gapon <avg@freebsd.org> > > 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? :-) > The single mode of course, which is forced :) Mistype, sorry. > 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. > Okay, then why little help there mentioning "rw" as an option? It's of bug in help there, or in parsing mount options (rw is ignored). If I'm not fully clear - I can provide some screenshots. > > > 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. > Yes, it's feature when it mounting with default parameters (e.g. with none). But what about rw? > > > 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? > Nope, I'm already on console in single mode. > > 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. > That's not solve problem that on my rootfs no fstab exists, so next boot will bring me to same situation. If someone willing to help/debug with this thing - get any bootable media (like live FreeBSD), and just rename/move/delete fstab file, and simply boot. > > -- > Andriy Gapon > -- Regards, Alexander Yerenkow
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