nixpkgs/pkgs/development/libraries/fontconfig/make-fonts-cache.nix
Bjørn Forsman 8ea7a302bd make-fonts-cache: remove CACHEDIR.TAG file from Nix store
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...
2018-02-11 16:07:43 +01:00

32 lines
824 B
Nix

{ runCommand, lib, writeText, fontconfig, fontDirectories }:
runCommand "fc-cache"
rec {
buildInputs = [ fontconfig.bin ];
passAsFile = [ "fontDirs" ];
fontDirs = ''
<!-- Font directories -->
${lib.concatStringsSep "\n" (map (font: "<dir>${font}</dir>") fontDirectories)}
'';
}
''
export FONTCONFIG_FILE=$(pwd)/fonts.conf
cat > fonts.conf << EOF
<?xml version='1.0'?>
<!DOCTYPE fontconfig SYSTEM 'fonts.dtd'>
<fontconfig>
<include>${fontconfig.out}/etc/fonts/fonts.conf</include>
<cachedir>$out</cachedir>
EOF
cat "$fontDirsPath" >> fonts.conf
echo "</fontconfig>" >> fonts.conf
mkdir -p $out
fc-cache -sv
# This is not a cache dir in the normal sense -- it won't be automatically
# recreated.
rm "$out/CACHEDIR.TAG"
''