If you issue timedated's SetTimezone D-Bus call and strace the daemon,
you see that it fails because of this:
symlink("../usr/share/zoneinfo/Europe/Berlin",
"/etc/.localtime4e49606a750b8c2c") = -1 EROFS (Read-only file system)
Which means that timedated is trying, entirely sensibly, to atomically
overwrite the /etc/localtime symlink with the new timezone. This doesn't
work with our ro-/etc scheme that we have on our device images. There
will be a similar problem with updating /etc/timezone atomically too,
but that's a file instead of a symlink.
The rough workaround that we have in mind (suggested by cjwatson,
thanks) is to create a writable directory and make /etc/localtime
/etc/timezone /etc/adjtime be symlinks to files/symlinks as appropriate
inside there, which are themselves atomically updated. Do this for the
fallback case (EROFS) only.
It does mean that we'll need to play whack-a-mole with anything else
which thinks it can update these, sadly. I wonder if it'd be better to
revisit making the whole of /etc writable on our images and deal with
the conffile issues another way.
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https://bugs.launchpad.net/bugs/1227520
Title:
Timezone changes are not working due to ro /etc and bind mounts
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