#latexmk is great for auto-compiling your documents.
However, it fails in some cases and I'm currently bitten by a nasty one:
- \includgraphics'ed PDF is corrupt (It's a missing, unlocked #gitAnnex / @datalad file)
- that stops biblatex from properly finishing the .bcf XML file
- *before* fetching the missing PDF (with #DataLad), latexmk runs biber on the now corrupt .bcf (fails and deletes the .bbl)
- vicious cycle repeats literally forever - latexmk is in an endless loop 🙄
I managed to have latexmk interpret the 'corrupt PDF' error properly by adding this to the .latexmkrc:
push @file_not_found, '!pdfTeX error: .*? \(file ([^)]+)\): xpdf: reading PDF image failed';
It now sees that that PDF is 'missing'. However how do I get it to fetch broken files first and leave the bibliography stuff to the end? 😅
Currently trying to understand its 
#Perl code...
I have compiled a minimal working example here:
https://gitlab.com/nobodyinperson/latexmk-biber-endless-loop
This is also my first 
nix flake to make it completely reproducible. 🥳
Yann Büchau 
Michael Hanke
Paul Meyer