[systemd-devel] journalctl --since today --follow weirdness

[Kirill Elagin]

I've checked the code, and the issue is, basically, that `--since` and
skipping to the end with `--follow` are in a way “mutually exclusive”, that
is,
they are handled in a single `if … else if …` statement, so, because
`--since` is processed first, we don't skip to head.
But since `--follow` sets arg_lines to 10, we still get just 10 lines of
output. And then the rest.


--
Кирилл Елагин


On Wed, Apr 23, 2014 at 9:53 PM, Kirill Elagin <kirelagin at gmail.com> wrote:

> Yeah, I see this with systemd 212.
>
> And let me clarify a little bit: this delay after showing first 10 lines
> is not a result of looking up for something;
> Following lines appear as soon as there is something new in the log (that
> is, actually what `-f` does).
> So, here is what I see:
>
> I type `journalctl --since today -f`.
> First 10 lines from today appear.
> As soon as something is written to log (e.g. I simulate this by
> deliberately failing a `sudo` authentication)
> all the remaining lines from today (including the new ones, of course)
> appear.
>
> That's clearly a bug.
>
>
> --
> Кирилл Елагин
>
>
> On Wed, Apr 23, 2014 at 8:05 PM, Mantas Mikulėnas <grawity at gmail.com>wrote:
>
>> On Wed, Apr 23, 2014 at 6:12 PM, Colin Guthrie <gmane at colin.guthr.ie>
>> wrote:
>> > What appears to happen instead is that you get the first 10 lines from
>> > the day (i.e. after midnight) and then *all* lines from today following
>> > that after a small delay (likely not a deliberate delay - just whatever
>> > overhead it takes to lookup and output the data)
>>
>> strace shows that it isn't looking up any data; it's actually waiting
>> for inotify events for the --follow mode. Seems odd.
>>
>> --
>> Mantas Mikulėnas <grawity at gmail.com>
>> _______________________________________________
>> systemd-devel mailing list
>> systemd-devel at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/systemd-devel
>>
>
>
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