From: Job Snijders <job@openbsd.org>
Subject: Re: rpki-client: set output files' modification time to be the buildtime
To: Theo Buehler <tb@theobuehler.org>
Cc: tech@openbsd.org
Date: Thu, 30 Oct 2025 23:31:00 +0000

On Thu, Oct 30, 2025 at 11:24:56PM +0000, Job Snijders wrote:
> On Thu, Oct 30, 2025 at 09:39:01PM +0100, Theo Buehler wrote:
> > The output.c changes except the one in outputheader() are largely
> > unrelated and should be done separately. The rest is ok with me.
> 
> ack - below is just the unrelated part
> 
> With this diff the utility sets the "modification time" of the output
> file to be the buildtime timestamp.
> 
> To me this is quite useful in analytics pipelines: moving & archiving
> files using the timestamp from the filesystem instead of having to
> deserialize the file content to find the timestamp shaves off a few
> seconds here and there.

example, with this diff the below timestamps all become aligned:

$ cd /var/db/rpki-client/

$ stat -l *
-rw-r--r-- 1 _rpki-client wheel 30176089 Oct 30 23:21:18 2025 bird
-rw-r--r-- 1 _rpki-client wheel 32711173 Oct 30 23:21:18 2025 csv
-rw-r--r-- 1 _rpki-client wheel 77791252 Oct 30 23:21:18 2025 json
-rw-r--r-- 1 _rpki-client wheel 40241970 Oct 30 23:21:18 2025 openbgpd
-rw-r--r-- 1 _rpki-client wheel 20093230 Oct 30 23:21:18 2025 rpki.ccr

$ grep Generated bird openbgpd
bird:# Generated on host feather.sobornost.net at Thu Oct 30 23:21:18 UTC 2025
openbgpd:# Generated on host feather.sobornost.net at Thu Oct 30 23:21:18 UTC 2025

$ grep buildtime json
                "buildtime": "2025-10-30T23:21:18Z",

$ rpki-client -f rpki.ccr | grep produced
CCR produced at:          Thu 30 Oct 2025 23:21:18 +0000