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# somewhat copied from the nixpkgs module (2020-06-15).
# uses tmux instead of screen and gets rid of the strange suid wrapper.
# Usage is `mosh weechat@host` and it will ForceCommand
# you to the weechat tmux session.
# Should you kill the tmux session, it will restart it after
# a few seconds.
{ config, lib, pkgs, ... }:
let
# tmux session name weechat runs in
sessionName = "weechat";
inherit (pkgs.vuizvui.profpatsch)
writeExecline
getBins
;
weechat-with-scripts = pkgs.weechat.override {
configure = { availablePlugins, ... }: {
scripts = [
pkgs.weechatScripts.weechat-matrix
];
};
};
bins = getBins pkgs.tmux [ "tmux" ]
// getBins weechat-with-scripts [ "weechat" ]
// getBins pkgs.dash [ "dash" ]
// getBins pkgs.s6-portable-utils [ "s6-sleep" ]
// getBins pkgs.mosh [ "mosh-server" ]
// getBins pkgs.execline [ "eltest" ]
;
until = { delaySec }: writeExecline "until" {} [
"if" "-tn" [ "$@" ]
bins.s6-sleep (toString delaySec)
# recurse back into until here
"$0" "$@"
];
startWeechatTmuxSession = wrapper: writeExecline "start-weechat-tmux-session" {} [
"if" ([
bins.tmux
"new-session"
# detach immediately
"-d"
"-s" sessionName
] ++ wrapper ++ [
bins.weechat
])
(until { delaySec = 3; })
# negate has-session
"if" "-n" [
bins.tmux "has-session"
"-t" sessionName
]
];
attachWeechatTmuxSession = writeExecline "attach-weechat-tmux-session" {} [
"importas" "-u" "-D" "" "what" "SSH_ORIGINAL_COMMAND"
# if the user passes "ssh" as argv, it will call tmux directly
"ifelse" [ bins.eltest "$what" "=" "ssh" ]
[ bins.tmux "attach-session" "-t" sessionName ]
# if not, it uses the mosh-server (default)
bins.mosh-server "--"
bins.tmux
"attach-session"
"-t" sessionName
];
weechatServiceOptions = {
authorizedKeys = lib.mkOption {
description = "ssh keys that should be able to connect to the weechat tmux session";
type = lib.types.listOf lib.types.str;
};
userName = lib.mkOption {
description = "user name of the user account that should be created for weechat";
type = lib.types.str;
};
extraGroups = lib.mkOption {
description = "extra groups to add to the weechat user";
type = lib.types.listOf lib.types.str;
default = [];
};
weechatDataDir = lib.mkOption {
description = "the data directory used for keeping configuration, logs and other state";
type = lib.types.path;
};
wrapExecStart = lib.mkOption {
description = "bernstein-chaining command wrapped around weechat";
type = lib.types.listOf lib.types.str;
default = [];
};
};
# map over the configs defined in the list option below
allCfgsString = f:
lib.concatStrings
(map f config.vuizvui.user.profpatsch.programs.weechat);
allCfgsMerge = f:
lib.foldl' lib.mergeAttrs {}
(map f config.vuizvui.user.profpatsch.programs.weechat);
in
{
options.vuizvui.user.profpatsch.programs.weechat = lib.mkOption {
description = "the weechat services to start";
type = lib.types.listOf (lib.types.submodule {
options = weechatServiceOptions;
});
default = [];
};
config = {
users = {
groups.weechat = {};
users = allCfgsMerge (cfg: {
${cfg.userName} = {
isSystemUser = true;
createHome = true;
shell = bins.dash;
group = "weechat";
home = cfg.weechatDataDir;
openssh.authorizedKeys.keys = cfg.authorizedKeys;
extraGroups = cfg.extraGroups;
};
});
};
# make sure the only use-case for this account
# is attaching the tmux session.
services.openssh.extraConfig = allCfgsString (cfg: ''
Match User ${cfg.userName}
ForceCommand ${attachWeechatTmuxSession}
'');
systemd.services = allCfgsMerge (cfg: {
"weechat-${cfg.userName}" = {
environment.WEECHAT_HOME = cfg.weechatDataDir;
serviceConfig = {
ExecStart = startWeechatTmuxSession cfg.wrapExecStart;
Restart = "always";
RestartSec = "3s";
User = cfg.userName;
Group = "weechat";
};
wantedBy = [ "multi-user.target" ];
wants = [ "network.target" ];
};
});
# This enables “lingering” for the CI user.
# Inspired by the discussion (and linked code)
# in https://github.com/NixOS/nixpkgs/issues/3702
# This should just be a NixOS option really.
system.activationScripts = {
enableLingering = ''
# remove all existing lingering users
rm -r /var/lib/systemd/linger
mkdir /var/lib/systemd/linger
'' + allCfgsString (cfg: ''
# enable for the subset of declared users
touch /var/lib/systemd/linger/${cfg.userName}
# '');
};
};
}
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