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{ config, lib, pkgs, ... }:
# TODO multiple users
# TODO inform about unused caches
# cache = url: "${cfg.dataDir}/.urlwatch/cache/${hashString "sha1" url}"
# TODO hooks.py
with builtins;
with lib;
let
cfg = config.krebs.urlwatch;
# TODO assert sendmail's existence
out = {
options.krebs.urlwatch = api;
config = mkIf cfg.enable imp;
};
api = {
enable = mkEnableOption "krebs.urlwatch";
dataDir = mkOption {
type = types.str;
default = "/var/lib/urlwatch";
description = ''
Directory where the urlwatch service should store its state.
'';
};
from = mkOption {
type = types.str;
default = "${user.name}@${config.networking.hostName}.retiolum";
description = ''
Content of the From: header of the generated mails.
'';
};
mailto = mkOption {
type = types.str;
description = ''
Content of the To: header of the generated mails. [AKA recipient :)]
'';
};
onCalendar = mkOption {
type = types.str;
description = ''
Run urlwatch at this interval.
The format is described in systemd.time(7), CALENDAR EVENTS.
'';
example = "04:23";
};
urls = mkOption {
type = with types; listOf str;
description = "URL to watch.";
example = [
https://nixos.org/channels/nixos-unstable/git-revision
];
};
};
urlsFile = toFile "urls" (concatStringsSep "\n" cfg.urls);
imp = {
systemd.timers.urlwatch = {
wantedBy = [ "timers.target" ];
timerConfig = {
OnCalendar = cfg.onCalendar;
Persistent = "true";
};
};
systemd.services.urlwatch = {
path = with pkgs; [
coreutils
gnused
urlwatch
];
environment = {
HOME = cfg.dataDir;
LC_ALL = "en_US.UTF-8";
LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
};
serviceConfig = {
User = user.name;
PermissionsStartOnly = "true";
PrivateTmp = "true";
Type = "oneshot";
ExecStartPre =
pkgs.writeScript "urlwatch-prestart" ''
#! /bin/sh
set -euf
dataDir=$HOME
if ! test -e "$dataDir"; then
mkdir -m 0700 -p "$dataDir"
chown ${user.name}: "$dataDir"
fi
'';
ExecStart = pkgs.writeScript "urlwatch" ''
#! /bin/sh
set -euf
from=${escapeShellArg cfg.from}
mailto=${escapeShellArg cfg.mailto}
urlsFile=${escapeShellArg urlsFile}
cd /tmp
urlwatch -e --urls="$urlsFile" > changes 2>&1 || :
if test -s changes; then
date=$(date -R)
subject=$(sed -n 's/^\(CHANGED\|ERROR\|NEW\): //p' changes \
| tr \\n \ )
{
echo "Date: $date"
echo "From: $from"
echo "Subject: $subject"
echo "To: $mailto"
echo
cat changes
} | /var/setuid-wrappers/sendmail -t
fi
'';
};
};
users.extraUsers = singleton {
inherit (user) name uid;
};
};
user = {
name = "urlwatch";
uid = 3467631196; # genid urlwatch
};
in
out
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