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bug#35746: Evolution calendar gets the timezone wrong
From: |
sirmacik |
Subject: |
bug#35746: Evolution calendar gets the timezone wrong |
Date: |
Sun, 19 May 2019 23:17:29 +0200 |
User-agent: |
Microsoft Office/14.0 (Windows NT 6.0; Microsoft Outlook 14.0.4760; Pro) |
Timothy Sample dixit (2019-05-18, 14:43):
> Hi again,
>
> Timothy Sample <address@hidden> writes:
>
> > Hello,
> >
> > Ludovic Courtès <address@hidden> writes:
> >
> >> Hi Ben,
> >>
> >> Ben Sturmfels <address@hidden> skribis:
> >>
> >>> In Evolution though, all my calendar events show up in UTC time, so I
> >>> have appointments showing up at eg. 1am.
> >>>
> >>> When I go to Edit, Preferences, Calendar and Task, General, under
> >>> timezone it says:
> >>>
> >>> [x] Use system time (UTC)
> >>
> >> Could you figure out how Evolution determines what the current time zone
> >> is?
> >>
> >> Guix provides /etc/localtime, which is what libc functions use, but I’m
> >> guessing Evolution uses a custom framework, possibly involving a
> >> hard-to-believe network of D-Bus services.
> >
> > I just looked through the source code, and learned that it really,
> > really wants “/etc/localtime” to be a symlink, because it wants to
> > resolve which timezone alias the user is using, not just the data. If
> > it is not a symlink, it runs through a bunch of system specific checks
> > (looking up configuration files, etc.) and then tries to compare inodes
> > and finally file contents. I get why it wants the name and not just the
> > data, but I’m not sure why it tries to figure out the absolute canonical
> > source file for the timezone data instead of just taking the data from
> > “/etc/localtime”.
> >
> > It’s easy to patch “evolution-data-server”, but maybe we could do
> > better? It seems the “right” way to do what they are doing is to check
> > the “TZ” environment variable. However, we don’t set that anymore
> > because it causes problems with setuid programs
> > (cf. <https://bugs.gnu.org/29212>). We have a comment that says that
> > “TZ” is unnecessary, but it actually has a bit more information than
> > just having data in “/etc/localtime”, since it could be the name of a
> > timezone alias. A small improvement might be to make “/etc/localtime” a
> > symlink, but that might run into the same issues described the bug.
>
> Okay, so it turns I don’t know what “TZ” is! :p
>
> It does not contain the timezone name, like “America/New_York”, but
> rather its designation, like “EST”. What “evolution-data-server” wants
> is the name.
>
> > I’ve noticed a few other problems with timezones in the GNOME ecosystem,
> > which is why I was curious about this. Perhaps they all have a common
> > root cause.
> >
> > I’m happy to patch this as stop-gap measure, but is there some way we
> > could “do the right thing” here?
>
> I guess there is no standard way to get the name of the system timezone,
> and that is why “evolution-data-server” goes to such great lengths to
> figure it out.
>
> Sorry for the noise!
>
>
> -- Tim
>
Hey Guix,
This problem seems to be also present also for other programs such as
GNU IceCat which reads UTC timezone every time, despite Europe/Warsaw
being set in my config.scm.
--
sirmacik
PGP: 0xE0DC81D523891771
- bug#35746: Evolution calendar gets the timezone wrong, Ben Sturmfels, 2019/05/15
- bug#35746: Evolution calendar gets the timezone wrong, Ludovic Courtès, 2019/05/16
- bug#35746: Evolution calendar gets the timezone wrong, Ben Sturmfels, 2019/05/16
- bug#35746: Evolution calendar gets the timezone wrong, Ben Sturmfels, 2019/05/16
- bug#35746: Evolution calendar gets the timezone wrong, Ben Sturmfels, 2019/05/16
- bug#35746: Evolution calendar gets the timezone wrong, Danny Milosavljevic, 2019/05/16
- bug#35746: IceCat/Chromium timezone is wrong, Ludovic Courtès, 2019/05/17
- bug#35746: Evolution calendar gets the timezone wrong, Ludovic Courtès, 2019/05/18
- bug#35746: Evolution calendar gets the timezone wrong, Timothy Sample, 2019/05/18