I gave a talk at Open Source Firmware Conference this year, Reproducible Builds All The Way Down:
https://www.osfc.io/2023/talks/reproducible-builds-all-the-way-down/
Slides available:
It was well received, highlighting many historic #ReproducibleBuilds issues in firmware projects that I maintain in #Debian and touching on the hows and whys of Reproducible Builds.
Open Source Firmware can be a great example of 100% reproducibility, with a narrow scope of code, and is often a key part in early system boot!
I made attempts to make the actual slides I used reproducible, as well, although quirks in Debian packaging behavior and timestamps in debian/changelog from the future ... lead to the .deb not actually being reproducible. :(
The PDF file itself is still reproducible, which is the only meaningful artifact inside the .deb!
Thanks to @CyrilBrulebois for troubleshooting the issue with future timestamps!
Now that it is in the past, future rebuilds are reproducible!