Java and timezone issues!
David M. Karr
davidmichaelkarr at gmail.com
Mon Apr 20 16:37:46 UTC 2009
Derek Broughton wrote:
> David M. Karr wrote:
>> The two packages that got installed this morning were "tzdata" and
>> "tzdata-java", one of which (or the installation process itself) changed
>> /etc/localtime from a link to a hard file. What's odd is that the
>> "installed files list" for either package does not list
> It's not odd - I explained it in my first post to this thread, and I thought
> you'd read it, since you responded.
I don't know what specific post you're referring to.
>> However, I suppose if something tried to replace the
>> file that "/etc/localtime" was symlinked to, the process of doing that
>> might leave "/etc/localtime" as a plain copy of the original
>> symlinked-to file.
I don't know how it's doing it, I just know from a very simple
experiment that it is. Just before I installed the tzdata update a
couple of days ago, I looked at the file. It was a symlink. I
installed the tzdata update. It was now a plain file.
>> The "tzdata" package had
>> "/usr/share/zoneinfo/US/Pacific" in its installed files list, which is
>> the file /etc/localtime is supposed to be symlinked to.
> It's _not_ supposed to be symlinked.
I'm sure you're right. The symlink is a workaround for the broken
timezone detection process in Java. It's apparently been used so much
some people assumed it was supposed to be that way.
>> If I'm guessing correctly about what happens when a file is moved on top
>> of a file that is symlinked-to, then changing /etc/localtime from a
>> symlink to a plain file may be completely inadvertent.
> Try it. You replace the destination file, not the link. That's why I
> suggested it could be very bad for you to replace a file that _should_ be a
> real file with a symlink.
Yes, I did try it. I found no "accidental" way to make a symlink become
a plain file with contents identical to the originally linked-to file.
As /etc/localtime isn't in the file list of either of those packages, I
have no idea how or why the process changes it, whether or not it's
supposed to be a link.
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