system-manager/nix/lib.nix
2023-02-14 13:39:10 +01:00

104 lines
3 KiB
Nix

{ nixpkgs
, self
,
}:
let
inherit (nixpkgs) lib;
in
{
makeSystemConfig =
{ system
, modules
, extraSpecialArgs ? { }
,
}:
let
pkgs = nixpkgs.legacyPackages.${system};
inherit (self.packages.${system}) system-manager;
nixosConfig = (lib.nixosSystem {
inherit system;
modules = [ ./modules/system-manager.nix ] ++ modules;
specialArgs = extraSpecialArgs;
}).config;
returnIfNoAssertions = drv:
let
failedAssertions = map (x: x.message) (lib.filter (x: !x.assertion) nixosConfig.assertions);
in
if failedAssertions != [ ]
then throw "\nFailed assertions:\n${lib.concatStringsSep "\n" (map (x: "- ${x}") failedAssertions)}"
else lib.showWarnings nixosConfig.warnings drv;
services =
lib.listToAttrs
(map
(name:
let
serviceName = "${name}.service";
in
lib.nameValuePair serviceName {
storePath =
''${nixosConfig.systemd.units."${serviceName}".unit}/${serviceName}'';
})
nixosConfig.system-manager.services);
servicesPath = pkgs.writeTextFile {
name = "services";
destination = "/services.json";
text = lib.generators.toJSON { } services;
};
# TODO: handle globbing
etcFiles =
let
isManaged = name: lib.elem name nixosConfig.system-manager.etcFiles;
addToStore = name: file: pkgs.runCommandLocal "${name}-etc-link" { } ''
mkdir -p "$out/etc/$(dirname "${file.target}")"
ln -s "${file.source}" "$out/etc/${file.target}"
if [ "${file.mode}" != symlink ]; then
echo "${file.mode}" > "$out/etc/${file.target}.mode"
echo "${file.user}" > "$out/etc/${file.target}.uid"
echo "${file.group}" > "$out/etc/${file.target}.gid"
fi
'';
filteredEntries = lib.filterAttrs
(name: etcFile: etcFile.enable && isManaged name)
nixosConfig.environment.etc;
srcDrvs = lib.mapAttrs addToStore filteredEntries;
entries = lib.mapAttrs
(name: file: file // { source = "${srcDrvs.${name}}"; })
filteredEntries;
staticEnv = pkgs.buildEnv {
name = "etc-static-env";
paths = lib.attrValues srcDrvs;
};
in
{ inherit entries staticEnv; };
etcPath = pkgs.writeTextFile {
name = "etcFiles";
destination = "/etcFiles.json";
text = lib.generators.toJSON { } etcFiles;
};
activationScript = pkgs.writeShellScript "activate" ''
${system-manager}/bin/system-manager activate \
--store-path "$(realpath $(dirname ''${0}))" \
"$@"
'';
in
returnIfNoAssertions (
pkgs.linkFarmFromDrvs "system-manager" [
servicesPath
etcPath
activationScript
]
);
}