159 lines
4.0 KiB
Nix
159 lines
4.0 KiB
Nix
{ config, lib, pkgs, ... }:
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# TODO multiple users
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# TODO inform about unused caches
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# cache = url: "${cfg.dataDir}/.urlwatch/cache/${hashString "sha1" url}"
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# TODO hooks.py
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let
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inherit (builtins) toFile;
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inherit (lib)
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concatStringsSep escapeShellArg mkIf mkOption optionals singleton types;
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inherit (pkgs) writeScript;
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cfg = config.tv.urlwatch;
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api = {
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dataDir = mkOption {
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type = types.str;
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default = "/var/lib/urlwatch";
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description = ''
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Directory where the urlwatch service should store its state.
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'';
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};
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enable = mkOption {
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type = types.bool;
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default = false;
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description = ''
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Whether to enable the urlwatch service.
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If enabled, then create a timer that calls urlwatch and sends mails
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whenever something has changed or an error occurs.
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'';
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};
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from = mkOption {
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type = types.str;
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default = "${cfg.user}@${config.networking.hostName}.retiolum";
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description = ''
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Content of the From: header of the generated mails.
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'';
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};
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mailto = mkOption {
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type = types.str;
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description = ''
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Content of the To: header of the generated mails. [AKA recipient :)]
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'';
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};
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onCalendar = mkOption {
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type = types.str;
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description = ''
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Run urlwatch at this interval.
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The format is described in systemd.time(7), CALENDAR EVENTS.
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'';
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example = "04:23";
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};
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urls = mkOption {
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type = with types; listOf str;
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description = "URL to watch.";
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example = [
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https://nixos.org/channels/nixos-unstable/git-revision
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];
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};
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user = mkOption {
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type = types.str;
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default = "urlwatch";
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description = "User under which urlwatch runs.";
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};
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};
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urlsFile = toFile "urls" (concatStringsSep "\n" cfg.urls);
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impl = {
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systemd.timers.urlwatch = {
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wantedBy = [ "timers.target" ];
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timerConfig = {
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OnCalendar = cfg.onCalendar;
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Persistent = "true";
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};
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};
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systemd.services.urlwatch = {
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path = with pkgs; [
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coreutils
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gnused
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urlwatch
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];
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environment = {
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HOME = cfg.dataDir;
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LC_ALL = "en_US.UTF-8";
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LOCALE_ARCHIVE = "${pkgs.glibcLocales}/lib/locale/locale-archive";
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SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
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};
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serviceConfig = {
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User = cfg.user;
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PermissionsStartOnly = "true";
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PrivateTmp = "true";
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Type = "oneshot";
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ExecStartPre =
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writeScript "urlwatch-prestart" ''
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#! /bin/sh
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set -euf
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dataDir=$HOME
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user=${escapeShellArg cfg.user}
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if ! test -e "$dataDir"; then
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mkdir -m 0700 -p "$dataDir"
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chown "$user": "$dataDir"
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fi
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'';
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ExecStart = writeScript "urlwatch" ''
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#! /bin/sh
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set -euf
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from=${escapeShellArg cfg.from}
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mailto=${escapeShellArg cfg.mailto}
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urlsFile=${escapeShellArg urlsFile}
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user=${escapeShellArg cfg.user}
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cd /tmp
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urlwatch -e --urls="$urlsFile" > changes 2>&1 || :
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if test -s changes; then
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date=$(date -R)
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subject=$(sed -n 's/^\(CHANGED\|ERROR\|NEW\): //p' changes \
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| tr \\n \ )
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{
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echo "Date: $date"
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echo "From: $from"
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echo "Subject: $subject"
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echo "To: $mailto"
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echo
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cat changes
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} | /var/setuid-wrappers/sendmail -t
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fi
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'';
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};
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};
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users.extraUsers = optionals (cfg.user == "urlwatch") (singleton {
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name = "urlwatch";
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uid = 3450919516; # bin/genid urlwatch
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});
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};
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in
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{
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# TODO
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#imports = [
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# ./exim
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#];
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#config = mkIf cfg.enable
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# (if config.tv.exim.enable
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# then impl
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# else throw "tv.exim must be enabled when enabling tv.urlwatch");
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options.tv.urlwatch = api;
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config = impl;
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}
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