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-rw-r--r--modules/tv/urlwatch/default.nix158
1 files changed, 158 insertions, 0 deletions
diff --git a/modules/tv/urlwatch/default.nix b/modules/tv/urlwatch/default.nix
new file mode 100644
index 0000000..87ec289
--- /dev/null
+++ b/modules/tv/urlwatch/default.nix
@@ -0,0 +1,158 @@
+{ 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;
+}