Bryan Kadzban wrote:
> Bruce Dubbs wrote:
>> I don't know if this is worth spending a lot of time, but I'd like to
>> see a system that can have / mounted read only.
>
> Then you're going to *NEED* the adjtime file somewhere other than the
> rootfs... :-)
Right.
>> The problem areas during boot are /etc/mtab, /etc/blkid.tab, and
>> /etc/adjtime. With the move of libblkid and libuuid to
>> util-linux-ng, the first two are being addressed in the relatively
>> near future,
>
> Mmm? Did mount stop writing to /etc/mtab or something? That needs to
> be writable no matter which blkid / uuid library you use. Unless you
> don't mind having "-o user" broken (I don't, but others probably do);
> then you can symlink it to /proc/mounts.
Not yet, but Karel Zak, th emaintainer wrote: "My plan is to support systems
without /etc/mtab and use /proc/self/mountinfo in util-linux-ng 2.{17,18}
(September/October 2009 or so...)."
I'm not sure when mountinfo went into the kernel. 2.6.26.4 has it, but
2.2.22.5
does not.
> blkid.tab may not be required anymore, though. I don't know the status
> of that.
I don't either. It's just an issue that needs to be addressed for a read only
rootfs. It's a chicken/egg type of thing, somewhat like the issue of log
entries before syslogd is started up.
>> but we should get adjtime right for any reasonable configuration.
>
> A warning in the book regarding /var might be in order. Mentioning that
> NTP probably doesn't require the adjtime file at all (depending on
> whether the user wants a more-accurate clock before NTP starts) may be a
> good idea as well.
Yes. That may be our best option for now.
-- Bruce
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