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{ 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
{
options = {
users.users = mkOption {
options = [{
linger = mkEnableOption "lingering for the user";
}];
};
};
config = {
system.activationScripts.update-lingering =
stringAfter [ "users" ] updateLingering;
};
}
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