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fix(nix): harden fontconfig compatibility across host setups

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Nicolai Bruns committed 2026-10-20 13:31:02 +02:00
1 parent ec85cfb96b
commit 6a96869db8
4 files changed
+131 -6
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flake.nix
+29 -5
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@@ -17,7 +17,14 @@
darlingFonts = [ pkgs.liberation_ttf pkgs.dejavu_fonts ];
darlingFontsConf = pkgs.makeFontsConf {
fontDirectories = darlingFonts;
includes = [ "${pkgs.fontconfig.out}/etc/fonts/conf.d" ];
includes = [
"${pkgs.fontconfig.out}/etc/fonts/conf.d"
(pkgs.writeText "darling-user-fonts.conf" ''
<fontconfig>
<dir>~/.fonts</dir>
</fontconfig>
'')
];
};
# Python environment with dependencies required by tooling
@@ -163,8 +170,8 @@
export DPREFIX="''${DPREFIX:-$HOME/.darling}"
export LC_ALL=C.UTF-8
export LANG=C.UTF-8
unset FONTCONFIG_PATH FONTCONFIG_SYSROOT
export FONTCONFIG_FILE=${darlingFontsConf}
export FONTCONFIG_PATH=${pkgs.fontconfig.out}/etc/fonts
export DARLING_RUNNER_DIR=${darlingRunner}/bin
export PATH="$DARLING_RUNNER_DIR:/usr/local/bin:''${PATH:-}"
export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig:/usr/local/share/pkgconfig:/usr/lib/pkgconfig:/usr/lib64/pkgconfig:/usr/share/pkgconfig:''${PKG_CONFIG_PATH:-}"
@@ -267,10 +274,10 @@ DESKTOP_EOF
fonts = pkgs.runCommand "darling-lol-font-tests" {
nativeBuildInputs = [ pkgs.fontconfig ];
} ''
export HOME="$TMPDIR/home" XDG_CONFIG_HOME="$TMPDIR/config"
export XDG_DATA_HOME="$TMPDIR/data" XDG_CACHE_HOME="$TMPDIR/cache"
export HOME="$TMPDIR/home with spaces" XDG_CONFIG_HOME="$TMPDIR/config with spaces"
export XDG_DATA_HOME="$TMPDIR/data with spaces" XDG_CACHE_HOME="$TMPDIR/cache with spaces"
unset FONTCONFIG_PATH FONTCONFIG_SYSROOT
export FONTCONFIG_FILE=${darlingFontsConf}
export FONTCONFIG_PATH=${pkgs.fontconfig.out}/etc/fonts
mkdir -p "$HOME" "$XDG_CONFIG_HOME" "$XDG_DATA_HOME" "$XDG_CACHE_HOME"
# Check real font selection with no host or user text fonts available.
check_font() {
@@ -294,6 +301,23 @@ DESKTOP_EOF
cp -R ${pkgs.font-awesome}/share/fonts "$XDG_DATA_HOME/fonts"
fc-list --format '%{file}\n' | grep -F "$XDG_DATA_HOME/fonts/"
check_aliases
# Retain custom XDG and legacy fonts as well as user alias rules.
chmod u+w "$XDG_DATA_HOME/fonts"
mkdir -p "$HOME/.fonts" "$XDG_CONFIG_HOME/fontconfig"
cp ${pkgs.liberation_ttf}/share/fonts/truetype/LiberationSans-Regular.ttf "$XDG_DATA_HOME/fonts/user-text.ttf"
cp ${pkgs.liberation_ttf}/share/fonts/truetype/LiberationSerif-Regular.ttf "$HOME/.fonts/legacy-text.ttf"
fc-list --format '%{file}\n' | grep -Fx "$XDG_DATA_HOME/fonts/user-text.ttf"
fc-list --format '%{file}\n' | grep -Fx "$HOME/.fonts/legacy-text.ttf"
cat > "$XDG_CONFIG_HOME/fontconfig/fonts.conf" <<'USERCONF_EOF'
<fontconfig>
<alias>
<family>DarlingCompatibilityAlias</family>
<prefer><family>Liberation Serif</family></prefer>
</alias>
</fontconfig>
USERCONF_EOF
check_font DarlingCompatibilityAlias 'Liberation Serif'
touch "$out"
'';