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{ config, pkgs, lib, ... }:
let
cfg = config.programs.ccache;
in {
options.programs.ccache = {
# host configuration
enable = lib.mkEnableOption (lib.mdDoc "CCache");
cacheDir = lib.mkOption {
type = lib.types.path;
description = lib.mdDoc "CCache directory";
default = "/var/cache/ccache";
};
# target configuration
packageNames = lib.mkOption {
type = lib.types.listOf lib.types.str;
description = lib.mdDoc "Nix top-level packages to be compiled using CCache";
default = [];
example = [ "wxGTK32" "ffmpeg" "libav_all" ];
};
owner = lib.mkOption {
type = lib.types.str;
default = "root";
description = lib.mdDoc "Owner of CCache directory";
};
group = lib.mkOption {
type = lib.types.str;
default = "nixbld";
description = lib.mdDoc "Group owner of CCache directory";
};
};
config = lib.mkMerge [
# host configuration
(lib.mkIf cfg.enable {
systemd.tmpfiles.rules = [ "d ${cfg.cacheDir} 0770 ${cfg.owner} ${cfg.group} -" ];
# "nix-ccache --show-stats" and "nix-ccache --clear"
security.wrappers.nix-ccache = {
inherit (cfg) owner group;
setuid = false;
setgid = true;
source = pkgs.writeScript "nix-ccache.pl" ''
#!${pkgs.perl}/bin/perl
%ENV=( CCACHE_DIR => '${cfg.cacheDir}' );
sub untaint {
my $v = shift;
return '-C' if $v eq '-C' || $v eq '--clear';
return '-V' if $v eq '-V' || $v eq '--version';
return '-s' if $v eq '-s' || $v eq '--show-stats';
return '-z' if $v eq '-z' || $v eq '--zero-stats';
exec('${pkgs.ccache}/bin/ccache', '-h');
}
exec('${pkgs.ccache}/bin/ccache', map { untaint $_ } @ARGV);
'';
};
})
# target configuration
(lib.mkIf (cfg.packageNames != []) {
nixpkgs.overlays = [
(self: super: lib.genAttrs cfg.packageNames (pn: super.${pn}.override { stdenv = builtins.trace "with ccache: ${pn}" self.ccacheStdenv; }))
(self: super: {
ccacheWrapper = super.ccacheWrapper.override {
extraConfig = ''
export CCACHE_COMPRESS=1
export CCACHE_DIR="${cfg.cacheDir}"
export CCACHE_UMASK=007
if [ ! -d "$CCACHE_DIR" ]; then
echo "====="
echo "Directory '$CCACHE_DIR' does not exist"
echo "Please create it with:"
echo " sudo mkdir -m0770 '$CCACHE_DIR'"
echo " sudo chown ${cfg.owner}:${cfg.group} '$CCACHE_DIR'"
echo "====="
exit 1
fi
if [ ! -w "$CCACHE_DIR" ]; then
echo "====="
echo "Directory '$CCACHE_DIR' is not accessible for user $(whoami)"
echo "Please verify its access permissions"
echo "====="
exit 1
fi
'';
};
})
];
})
];
}
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