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{ config, lib, pkgs, ... }:
with lib;
let
cfg = config.services.xserver.gdk-pixbuf;
# Get packages to generate the cache for. We always include gdk-pixbuf.
effectivePackages = unique ([pkgs.gdk-pixbuf] ++ cfg.modulePackages);
# Generate the cache file by running gdk-pixbuf-query-loaders for each
# package and concatenating the results.
loadersCache = pkgs.runCommand "gdk-pixbuf-loaders.cache" { preferLocalBuild = true; } ''
(
for package in ${concatStringsSep " " effectivePackages}; do
module_dir="$package/${pkgs.gdk-pixbuf.moduleDir}"
if [[ ! -d $module_dir ]]; then
echo "Warning (services.xserver.gdk-pixbuf): missing module directory $module_dir" 1>&2
continue
fi
GDK_PIXBUF_MODULEDIR="$module_dir" \
${pkgs.stdenv.hostPlatform.emulator pkgs.buildPackages} ${pkgs.gdk-pixbuf.dev}/bin/gdk-pixbuf-query-loaders
done
) > "$out"
'';
in
{
options = {
services.xserver.gdk-pixbuf.modulePackages = mkOption {
type = types.listOf types.package;
default = [ ];
description = "Packages providing GDK-Pixbuf modules, for cache generation.";
};
};
# If there is any package configured in modulePackages, we generate the
# loaders.cache based on that and set the environment variable
# GDK_PIXBUF_MODULE_FILE to point to it.
config = mkIf (cfg.modulePackages != []) {
environment.variables = {
GDK_PIXBUF_MODULE_FILE = "${loadersCache}";
};
};
}
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