1 files changed, 33 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/development/libraries/fontconfig/make-fonts-cache.nix b/nixpkgs/pkgs/development/libraries/fontconfig/make-fonts-cache.nix
new file mode 100644
index 000000000000..47884b9c3b92
--- /dev/null
+++ b/nixpkgs/pkgs/development/libraries/fontconfig/make-fonts-cache.nix
@@ -0,0 +1,33 @@
+{ runCommand, lib, fontconfig, fontDirectories }:
+
+runCommand "fc-cache"
+  {
+    nativeBuildInputs = [ fontconfig.bin ];
+    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
+
+    mkdir -p $out
+    fc-cache -sv
+
+    # This is not a cache dir in the normal sense -- it won't be automatically
+    # recreated.
+    rm -f "$out/CACHEDIR.TAG"
+  ''