push sheeet

pkgs/development/libraries/fontconfig/make-fonts-cache.nix

@@ -0,0 +1,48 @@
+{
+  buildPackages,
+  fontconfig,
+  lib,
+  runCommand,
+  stdenv,
+}:
+let
+  fontconfig' = fontconfig;
+in
+{
+  fontconfig ? fontconfig',
+  fontDirectories,
+}:
+
+runCommand "fc-cache"
+  {
+    preferLocalBuild = true;
+    allowSubstitutes = false;
+    passAsFile = [ "fontDirs" ];
+    fontDirs = ''
+      <!-- Font directories -->
+      ${lib.concatStringsSep "\n" (map (font: "<dir>${font}</dir>") fontDirectories)}
+    '';
+  }
+  ''
+    export FONTCONFIG_FILE=$(pwd)/fonts.conf
+
+    cat > fonts.conf << EOF
+    <?xml version='1.0'?>
+    <!DOCTYPE fontconfig SYSTEM 'urn:fontconfig:fonts.dtd'>
+    <fontconfig>
+      <include>${fontconfig.out}/etc/fonts/fonts.conf</include>
+      <cachedir>$out</cachedir>
+    EOF
+    cat "$fontDirsPath" >> fonts.conf
+    echo "</fontconfig>" >> fonts.conf
+
+    # N.B.: fc-cache keys its cache entries by architecture.
+    # We must invoke the host `fc-cache` (not the build fontconfig) if we want
+    # the cache to be usable by the host.
+    mkdir -p $out
+    ${stdenv.hostPlatform.emulator buildPackages} ${lib.getExe' fontconfig "fc-cache"} -sv
+
+    # This is not a cache dir in the normal sense -- it won't be automatically
+    # recreated.
+    rm -f "$out/CACHEDIR.TAG"
+  ''