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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
let
inherit (builtins) toFile;
inherit (lib)
concatStringsSep escapeShellArg mkIf mkOption optionals singleton types;
inherit (pkgs) writeScript;
cfg = config.tv.urlwatch;
api = {
dataDir = mkOption {
type = types.str;
default = "/var/lib/urlwatch";
description = ''
Directory where the urlwatch service should store its state.
'';
};
enable = mkOption {
type = types.bool;
default = false;
description = ''
Whether to enable the urlwatch service.
If enabled, then create a timer that calls urlwatch and sends mails
whenever something has changed or an error occurs.
'';
};
from = mkOption {
type = types.str;
default = "${cfg.user}@${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
];
};
user = mkOption {
type = types.str;
default = "urlwatch";
description = "User under which urlwatch runs.";
};
};
urlsFile = toFile "urls" (concatStringsSep "\n" cfg.urls);
impl = {
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 = cfg.user;
PermissionsStartOnly = "true";
PrivateTmp = "true";
Type = "oneshot";
ExecStartPre =
writeScript "urlwatch-prestart" ''
#! /bin/sh
set -euf
dataDir=$HOME
user=${escapeShellArg cfg.user}
if ! test -e "$dataDir"; then
mkdir -m 0700 -p "$dataDir"
chown "$user": "$dataDir"
fi
'';
ExecStart = writeScript "urlwatch" ''
#! /bin/sh
set -euf
from=${escapeShellArg cfg.from}
mailto=${escapeShellArg cfg.mailto}
urlsFile=${escapeShellArg urlsFile}
user=${escapeShellArg cfg.user}
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 = optionals (cfg.user == "urlwatch") (singleton {
name = "urlwatch";
uid = 3450919516; # bin/genid urlwatch
});
};
in
{
# TODO
#imports = [
# ./exim
#];
#config = mkIf cfg.enable
# (if config.tv.exim.enable
# then impl
# else throw "tv.exim must be enabled when enabling tv.urlwatch");
options.tv.urlwatch = api;
config = impl;
}
|
