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Add Chinese font support with Noto CJK fonts for matplotlib
- Add noto-fonts-cjk-sans and noto-fonts-cjk-serif packages to runtime environment - Configure fontconfig with Noto CJK font aliases for SC, TC, JP, and KR variants - Copy Noto CJK fonts to system font directory at build time - Create fontconfig configuration files for proper font discovery - Configure matplotlib to use Noto Sans CJK fonts by default - Add font setup script for runtime font cache initialization
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‎docker.nix‎

Lines changed: 204 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -835,6 +835,11 @@ finally:
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pkgs.blas
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pkgs.gcc.cc.lib
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pkgs.stdenv.cc.cc.lib
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# Chinese font support for matplotlib
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# Note: noto-fonts-cjk has been renamed to noto-fonts-cjk-sans
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pkgs.noto-fonts-cjk-sans
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pkgs.noto-fonts-cjk-serif
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pkgs.fontconfig
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];
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};
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@@ -846,6 +851,31 @@ finally:
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mkdir -p $out/app $out/bin $out/tmp $out/etc/uv $out/home/python-user
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mkdir -p $out/etc/passwd.d $out/etc/group.d $out/etc/shadow.d
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mkdir -p $out/.local/lib/python3.12/site-packages
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mkdir -p $out/usr/share/fonts/truetype/noto-cjk
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mkdir -p $out/etc/fonts/conf.d
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# Create fontconfig main configuration file
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# Fontconfig requires fonts.conf to exist, even if minimal
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cat > $out/etc/fonts/fonts.conf << 'FONTSCONF'
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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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<!-- Font directory list -->
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<dir>/usr/share/fonts</dir>
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<dir>/usr/share/fonts/truetype</dir>
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<dir>/usr/share/fonts/truetype/noto-cjk</dir>
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<dir>/usr/share/fonts/opentype</dir>
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<dir>/usr/share/fonts/opentype/noto</dir>
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<!-- Include conf.d directory for additional configurations -->
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<include ignore_missing="yes">conf.d</include>
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<!-- Rescan interval (in seconds) -->
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<rescan>
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<int>30</int>
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</rescan>
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</fontconfig>
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FONTSCONF
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# Create uv cache dir
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mkdir -p $out/tmp/.uv_cache
@@ -876,6 +906,151 @@ finally:
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# Copy MOSEK Python API from uv installation
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cp -r ${mosekPythonPackages}/site-packages/* $out/opt/mosek/lib/python3.12/site-packages/
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# Copy Noto CJK fonts to system font directory at build time
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# Note: noto-fonts-cjk has been split into noto-fonts-cjk-sans and noto-fonts-cjk-serif
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# Font files are typically in share/fonts/opentype/noto-cjk/ or share/fonts/truetype/noto-cjk/
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echo "Copying Noto CJK fonts..."
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# Copy all font files from both packages (sans and serif)
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for font_pkg in "${pkgs.noto-fonts-cjk-sans}" "${pkgs.noto-fonts-cjk-serif}"; do
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# Check opentype/noto-cjk directory (most common location)
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if [ -d "$font_pkg/share/fonts/opentype/noto-cjk" ]; then
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echo " Copying from $font_pkg/share/fonts/opentype/noto-cjk"
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find "$font_pkg/share/fonts/opentype/noto-cjk" -type f \( -name "*.ttf" -o -name "*.otf" -o -name "*.ttc" -o -name "*.otf.ttc" \) -exec cp {} $out/usr/share/fonts/truetype/noto-cjk/ \; 2>/dev/null || true
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fi
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# Check truetype/noto-cjk directory
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if [ -d "$font_pkg/share/fonts/truetype/noto-cjk" ]; then
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echo " Copying from $font_pkg/share/fonts/truetype/noto-cjk"
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find "$font_pkg/share/fonts/truetype/noto-cjk" -type f \( -name "*.ttf" -o -name "*.otf" -o -name "*.ttc" -o -name "*.otf.ttc" \) -exec cp {} $out/usr/share/fonts/truetype/noto-cjk/ \; 2>/dev/null || true
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fi
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# Also check top-level fonts directory (fallback)
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if [ -d "$font_pkg/share/fonts" ]; then
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echo " Copying from $font_pkg/share/fonts (recursive)"
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find "$font_pkg/share/fonts" -type f \( -name "*.ttf" -o -name "*.otf" -o -name "*.ttc" -o -name "*.otf.ttc" \) -exec cp {} $out/usr/share/fonts/truetype/noto-cjk/ \; 2>/dev/null || true
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fi
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done
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# Verify fonts were copied
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FONT_COUNT=$(find $out/usr/share/fonts/truetype/noto-cjk -type f 2>/dev/null | wc -l)
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if [ "$FONT_COUNT" -eq 0 ]; then
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echo " WARNING: No font files were copied! Check font package paths."
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else
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echo " Successfully copied $FONT_COUNT font files to $out/usr/share/fonts/truetype/noto-cjk"
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fi
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# Create symbolic links in alternative paths for compatibility with user scripts
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# This allows scripts that check specific paths (like /usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc) to find the fonts
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mkdir -p $out/usr/share/fonts/opentype/noto
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if [ -f $out/usr/share/fonts/truetype/noto-cjk/NotoSansCJK-VF.otf.ttc ]; then
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ln -sf ../../truetype/noto-cjk/NotoSansCJK-VF.otf.ttc $out/usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc 2>/dev/null || true
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echo " Created symlink: /usr/share/fonts/opentype/noto/NotoSansCJK-Regular.ttc"
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fi
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# Create fontconfig configuration
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# IMPORTANT: No leading spaces before XML declaration
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cat > $out/etc/fonts/conf.d/99-noto-cjk.conf << 'FONTCONF'
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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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<dir>/usr/share/fonts/truetype/noto-cjk</dir>
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<alias>
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<family>sans-serif</family>
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<prefer>
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<family>Noto Sans CJK SC</family>
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<family>Noto Sans CJK TC</family>
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<family>Noto Sans CJK JP</family>
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<family>Noto Sans CJK KR</family>
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</prefer>
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</alias>
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<alias>
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<family>serif</family>
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<prefer>
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<family>Noto Serif CJK SC</family>
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<family>Noto Serif CJK TC</family>
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<family>Noto Serif CJK JP</family>
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<family>Noto Serif CJK KR</family>
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</prefer>
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</alias>
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</fontconfig>
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FONTCONF
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# Create matplotlib configuration directory and file at build time
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mkdir -p $out/home/python-user/.matplotlib
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cat > $out/home/python-user/.matplotlib/matplotlibrc << 'MATPLOTLIBRC'
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font.family: sans-serif
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font.sans-serif: Noto Sans CJK JP, Noto Sans CJK TC, Noto Sans CJK SC, Noto Sans CJK KR, DejaVu Sans
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axes.unicode_minus: False
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MATPLOTLIBRC
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# Create font setup script for runtime
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cat > $out/setup-fonts.sh << 'EOF'
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#!/bin/bash
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# Setup Chinese fonts for matplotlib
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echo "Setting up Chinese font support..."
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# Ensure user cache directories exist (these can be created in tmpfs)
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mkdir -p /home/python-user/.cache/fontconfig 2>/dev/null || true
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mkdir -p /home/python-user/.matplotlib 2>/dev/null || true
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# Copy matplotlibrc from Nix store to runtime directory (if it exists)
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# The runtime directory is tmpfs, so we need to copy the config file
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if [ -f /nix/store/*-docker-setup/home/python-user/.matplotlib/matplotlibrc ]; then
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MATPLOTLIBRC_SOURCE=$(find /nix/store -path "*/docker-setup/home/python-user/.matplotlib/matplotlibrc" 2>/dev/null | head -1)
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if [ -n "$MATPLOTLIBRC_SOURCE" ]; then
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cp "$MATPLOTLIBRC_SOURCE" /home/python-user/.matplotlib/matplotlibrc 2>/dev/null || true
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fi
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fi
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# Create/update matplotlibrc with correct font names
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# Use actual available font names: Noto Sans CJK JP (available) instead of SC (may not be available)
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cat > /home/python-user/.matplotlib/matplotlibrc << 'MATPLOTLIBRC'
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font.family: sans-serif
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font.sans-serif: Noto Sans CJK JP, Noto Sans CJK TC, Noto Sans CJK SC, Noto Sans CJK KR, DejaVu Sans
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axes.unicode_minus: False
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MATPLOTLIBRC
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# Update font cache (if fontconfig is available)
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# Note: Font files are already in /usr/share/fonts/truetype/noto-cjk (copied at build time)
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if command -v fc-cache >/dev/null 2>&1; then
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fc-cache -fv 2>/dev/null || true
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fi
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# Verify font files are accessible
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if [ -f /usr/share/fonts/truetype/noto-cjk/NotoSansCJK-VF.otf.ttc ]; then
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echo "✓ Noto CJK font files found in /usr/share/fonts/truetype/noto-cjk/"
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else
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echo "⚠ Warning: Noto CJK font files not found in expected location"
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fi
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# Set matplotlib font configuration environment variables
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export MPLCONFIGDIR=/home/python-user/.matplotlib
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export FONTCONFIG_PATH=/etc/fonts
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# Ensure fonts.conf exists (fontconfig requires it)
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if [ ! -f /etc/fonts/fonts.conf ]; then
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mkdir -p /etc/fonts
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cat > /etc/fonts/fonts.conf << 'FONTSCONF'
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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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<dir>/usr/share/fonts</dir>
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<dir>/usr/share/fonts/truetype</dir>
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<dir>/usr/share/fonts/truetype/noto-cjk</dir>
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<dir>/usr/share/fonts/opentype</dir>
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<dir>/usr/share/fonts/opentype/noto</dir>
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<include ignore_missing="yes">conf.d</include>
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<rescan>
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<int>30</int>
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</rescan>
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</fontconfig>
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FONTSCONF
1047+
fi
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1049+
echo "Chinese font support configured"
1050+
EOF
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chmod +x $out/setup-fonts.sh
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# Create uv configuration
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cat > $out/etc/uv/uv.toml << 'EOFUV'
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# Global uv configuration
@@ -1139,6 +1314,28 @@ in
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# Ensure runtime directories exist in the layer
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mkdir -p tmp tmp/.uv_cache .local/lib/python3.12/site-packages home/python-user app
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mkdir -p usr/share/fonts/truetype/noto-cjk
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mkdir -p usr/share/fonts/opentype/noto
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mkdir -p etc/fonts/conf.d
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# Ensure fonts.conf exists (fontconfig requires it)
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if [ ! -f etc/fonts/fonts.conf ]; then
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cat > etc/fonts/fonts.conf << 'FONTSCONF'
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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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<dir>/usr/share/fonts</dir>
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<dir>/usr/share/fonts/truetype</dir>
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<dir>/usr/share/fonts/truetype/noto-cjk</dir>
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<dir>/usr/share/fonts/opentype</dir>
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<dir>/usr/share/fonts/opentype/noto</dir>
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<include ignore_missing="yes">conf.d</include>
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<rescan>
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<int>30</int>
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</rescan>
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</fontconfig>
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FONTSCONF
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fi
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# /tmp must be writable for non-root (cplex.log, matplotlib cache, tempfiles, uv cache)
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chmod 1777 tmp
@@ -1187,8 +1384,9 @@ in
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"SSL_CERT_FILE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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"CURL_CA_BUNDLE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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"REQUESTS_CA_BUNDLE=${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt"
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# Matplotlib configuration directory
1191-
"MPLCONFIGDIR=/tmp/.matplotlib"
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# Font configuration for matplotlib
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"FONTCONFIG_PATH=/etc/fonts"
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"MPLCONFIGDIR=/home/python-user/.matplotlib"
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# Disable dangerous modules
11931391
"PYTHON_DISABLE_MODULES=os,subprocess,sys,importlib,exec,eval,compile,__import__,open,file,input,raw_input,urllib,requests,socket,ftplib,smtplib,poplib,imaplib,nntplib,telnetlib"
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# Restrict network access
@@ -1203,7 +1401,10 @@ in
12031401
"MAIL="
12041402
];
12051403
# Use tail -f /dev/null for container management (keeps container running)
1206-
Cmd = [ "tail" "-f" "/dev/null" ];
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# Note: setup-fonts.sh is best-effort (uses || true), so it won't fail the container startup
1405+
# The container will continue to work even if font setup fails
1406+
# Font files are already copied at build time, this just updates the font cache
1407+
Cmd = [ "bash" "-c" "cat /etc/passwd.d/python-user >> /etc/passwd 2>/dev/null || true && cat /etc/group.d/python-user >> /etc/group 2>/dev/null || true && cat /etc/shadow.d/python-user >> /etc/shadow 2>/dev/null || true && (/setup-fonts.sh || true) && tail -f /dev/null" ];
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# Set security parameters - use non-root user
12081409
User = "1000:1000";
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# Additional security settings

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