hwclock's ADJPATH

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Hi guys,

Sami's latest hwclock patches reminded me of something I have long
been meaning to bring up:

I have been unable to figure out how to use hwclock in such a way that
we (Arch Linux) can set a reasonable ADJPATH.

These are the constraints we have:

/etc could possibly be mounted read-only.
/var might not be mounted at early boot.

This is the usage we have (in the cases where a machine does not use ntp):

1) At early boot we call "hwclock --systz", which require us to read
ADJPATH to determine if RTC is in UTC/LOCAL (so ADJTIME can not be in
/var).
2) From time to time (typically at shutdown), we call "hwclock
--adjust", which require us to write to ADJPATH (so ADJPATH can not be
in /etc).
3) The administrator should manually call "hwclock --set" and make
sure ADJPATH is writeable when this is done (for this, ADJPATH could
be either in /etc or /var).



Are these reasonable constraints and a reasonable usecase? If so, it
seems to me that the only way to make this work is to split ADJPATH
into two files, /etc/adjtime containing UTC/LOCAL and
/var/lib/hwclock/adjtime containing everything else. Or am I missing
something?

Cheers,

Tom
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