Squash changes containing private information

[perso/Immae/Config/Nix.git] / flakes / loginctl-linger / flake.nix

diff --git a/flakes/loginctl-linger/flake.nix b/flakes/loginctl-linger/flake.nix
new file mode 100644 (file)
index 0000000..4828d37
--- /dev/null
+++ b/flakes/loginctl-linger/flake.nix
@@ -0,0 +1,56 @@
+{
+  outputs = { self }: {
+    nixosModule = { config, lib, pkgs, ... }:
+      # https://github.com/michalrus/dotfiles/commit/ebd5fa9583f82589f23531647aa677feb3f8d344#diff-4d353005ef5b3e37f33c07332b8523edR1
+      # A temporary hack to `loginctl enable-linger $somebody` (for
+      # multiplexer sessions to last), until this one is unresolved:
+      # https://github.com/NixOS/nixpkgs/issues/3702
+      #
+      # Usage: `users.extraUsers.somebody.linger = true` or slt.
+
+      with lib;
+
+      let
+
+        dataDir = "/var/lib/systemd/linger";
+
+        lingeringUsers = map (u: u.name) (attrValues (flip filterAttrs config.users.users (n: u: u.linger)));
+
+        lingeringUsersFile = builtins.toFile "lingering-users"
+          (concatStrings (map (s: "${s}\n")
+            (sort (a: b: a < b) lingeringUsers))); # this sorting is important for `comm` to work correctly
+
+        updateLingering = pkgs.writeScript "update-lingering" ''
+          if [ ! -e ${dataDir} ]; then
+            install -m 0755 -o root -g root -d ${dataDir}
+          fi
+          if [ -e ${dataDir} ] ; then
+            ls ${dataDir} | sort | comm -3 -1 ${lingeringUsersFile} - | xargs -r ${pkgs.systemd}/bin/loginctl disable-linger
+            ls ${dataDir} | sort | comm -3 -2 ${lingeringUsersFile} - | xargs -r ${pkgs.systemd}/bin/loginctl  enable-linger
+          fi
+        '';
+
+      in
+
+      {
+        # Necessary for situations where flake gets included multiple times
+        key = builtins.hashString "sha256" (builtins.path { path = self.sourceInfo.outPath; name = "source"; });
+        options = {
+          users.users = mkOption {
+            type = lib.types.attrsOf (lib.types.submodule {
+              options = {
+                linger = mkEnableOption "lingering for the user";
+              };
+            });
+          };
+        };
+
+        config = {
+          system.activationScripts.update-lingering = {
+            deps = ["users"];
+            text = "${updateLingering}";
+          };
+        };
+      };
+  };
+}