I have several networking devices around the country with OpenWrt on them (for example, at my mom's house). They serve different needs, with different selections of packages installed, and are not of the same hardware, so keeping them up to date proved a hassle eventually. I chose to wrap some primitive Python around OpenWrt's excellent ImageBuilder that helps me keep a declarative build configuration around in an INI-style file, and (most of the time, when point releases are released) only dial up a single version number variable to rebuild all images in parallel. The flashing afterwards I haven't automated, but that might be too much of a footgun anyway.

If you feel like taking a look, here's the source: https://johannes.truschnigg.info/code/openwrt_autobuild/

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While I was responsible for running the internal CAs at $prevjob, I wanted to give (human) users a convenient and secure means to generate and submit CSRs. I implemented a browser-based CSR generator based on the great work if https://pkijs.org - a demo variant of this internal portal is online at https://johannes.truschnigg.info/csr/ and might actually be of use to someone else :)

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Several years ago also at $prevjob, I was looking for a reliable way to do PostgreSQL WAL archiving without the clunky shellscripts floating around in documentation and on Wikis, and implemented a little C program to do that job. While today you're probably using something like wal-g or other advanced tools that consume the WAL for replication and DR purposes, you may still want to have a program that does one thing, and one thing well, and that is making sure WAL segments get copied from location A to location B, without much overhead, period.

That would be it: https://johannes.truschnigg.info/code/pg_archive_wal_segment...