From: Marcin Borkowski <mbork@mbork.pl>
To: tomas@tuxteam.de
Cc: emacs-orgmode@gnu.org
Subject: Re: How to properly set up reminders for paying cellphone fees in org?
Date: Sat, 02 May 2020 13:46:28 +0200 [thread overview]
Message-ID: <87v9leo8yz.fsf@mbork.pl> (raw)
In-Reply-To: <20200502081244.GC7696@tuxteam.de>
On 2020-05-02, at 10:12, tomas@tuxteam.de wrote:
> On Sat, May 02, 2020 at 09:37:40AM +0200, Marcin Borkowski wrote:
>>
>> On 2020-04-30, at 07:02, Kyle Meyer <kyle@kyleam.com> wrote:
>>
>> > And note that a utility like datefudge or libfaketime is useful for
>> > testing these sorts of things out. For example:
>> >
>> > $ datefudge "2020-02-18" emacs [...]
>>
>> Shameless plug: I wrote about this use-case of datefudge sime time ago:
>> http://mbork.pl/2019-08-05_datefudge_and_agenda_testing
>>
>> (I don't know libfaketime).
>
> It just plays games with LD_PRELOAD to trick the application (which is
> supposed to use the usual libs when asking for time, but most do that).
>
> Infinitely more lightweight than a container or a VM. On Debian:
>
> tomas@trotzki:~$ apt show libfaketime
> Package: libfaketime
> [...]
> Download-Size: 31.2 kB
> APT-Sources: http://ftp.de.debian.org/debian buster/main amd64 Packages
> Description: Report faked system time to programs (preload library)
> The Fake Time Preload Library (FTPL, a.k.a. libfaketime) intercepts
> various system calls which programs use to retrieve the current date
> and time [...] FTPL allows you to specify both absolute dates (e.g.,
> 2004-01-01) and relative dates (e.g., 10 days ago).
>
> You might need a VM for an app which bypasses the "usual libraries",
> but then, I don't know whether I would like to have such a thing on
> my box. Probably not without a good reason :-)
One use-case when this might be reasonable is an application which talks
to a database, when you have to convince both the application and the
database server that the time is different than in reality.
Best,
--
Marcin Borkowski
http://mbork.pl
prev parent reply other threads:[~2020-05-02 11:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 4:19 How to properly set up reminders for paying cellphone fees in org? Vladimir Nikishkin
2020-04-30 5:02 ` Kyle Meyer
2020-04-30 6:22 ` Vladimir Nikishkin
2020-04-30 22:04 ` Kyle Meyer
2020-05-02 7:37 ` Marcin Borkowski
2020-05-02 8:12 ` tomas
2020-05-02 11:46 ` Marcin Borkowski [this message]
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