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8ea7a302bd
A CACHEDIR.TAG file indicates that the contents can be automatically re-generated. This is not really true for Nix store paths. (Well _Nix_ can recreate them, but that's different.) I noticed this issue as I was restoring full system backup that "for some reason" always missed /nix/store/*-fc-cache (found by `nix-store --verify --repair`). Turns out I was excluding caches from my backup...
32 lines
824 B
Nix
32 lines
824 B
Nix
{ runCommand, lib, writeText, fontconfig, fontDirectories }:
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runCommand "fc-cache"
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rec {
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buildInputs = [ fontconfig.bin ];
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passAsFile = [ "fontDirs" ];
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fontDirs = ''
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<!-- Font directories -->
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${lib.concatStringsSep "\n" (map (font: "<dir>${font}</dir>") fontDirectories)}
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'';
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}
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''
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export FONTCONFIG_FILE=$(pwd)/fonts.conf
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cat > fonts.conf << EOF
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<?xml version='1.0'?>
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<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
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<fontconfig>
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<include>${fontconfig.out}/etc/fonts/fonts.conf</include>
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<cachedir>$out</cachedir>
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EOF
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cat "$fontDirsPath" >> fonts.conf
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echo "</fontconfig>" >> fonts.conf
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mkdir -p $out
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fc-cache -sv
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# This is not a cache dir in the normal sense -- it won't be automatically
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# recreated.
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rm "$out/CACHEDIR.TAG"
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''
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