nixos/gitwatch: add module

Create module for gitwatch script. This module runs systemd services.
You are able to have several services for different paths at once.

Change-Id: If6100e883dd12a428f79881a80b9b88e683f6db9

nixos/modules/services/monitoring/gitwatch.nix

@@ -0,0 +1,87 @@
+{
+ lib,
+ pkgs,
+ config,
+ ...
+}:
+let
+ mkSystemdService =
+ name: cfg:
+ lib.nameValuePair "gitwatch-${name}" (
+ let
+ getvar = flag: var: lib.optionalString (cfg."${var}" != null) "${flag} ${cfg."${var}"}";
+ branch = getvar "-b" "branch";
+ remote = getvar "-r" "remote";
+ in
+ rec {
+ inherit (cfg) enable;
+ after = [ "network-online.target" ];
+ wants = after;
+ wantedBy = [ "multi-user.target" ];
+ description = "gitwatch for ${name}";
+ path = with pkgs; [
+ gitwatch
+ git
+ openssh
+ ];
+ script = ''
+ if [ -n "${cfg.remote}" ] && ! [ -d "${cfg.path}" ]; then
+ git clone ${branch} "${cfg.remote}" "${cfg.path}"
+ fi
+ gitwatch ${remote} ${branch} ${cfg.path}
+ '';
+ serviceConfig.User = cfg.user;
+ }
+ );
+in
+{
+ options.services.gitwatch = lib.mkOption {
+ description = ''
+ A set of git repositories to watch for. See
+ [gitwatch](https://github.com/gitwatch/gitwatch) for more.
+ '';
+ default = { };
+ example = {
+ my-repo = {
+ enable = true;
+ user = "user";
+ path = "/home/user/watched-project";
+ remote = "[email protected]:me/my-project.git";
+ };
+ disabled-repo = {
+ enable = false;
+ user = "user";
+ path = "/home/user/disabled-project";
+ remote = "[email protected]:me/my-old-project.git";
+ branch = "autobranch";
+ };
+ };
+ type =
+ with lib.types;
+ attrsOf (submodule {
+ options = {
+ enable = lib.mkEnableOption "watching for repo";
+ path = lib.mkOption {
+ description = "The path to repo in local machine";
+ type = str;
+ };
+ user = lib.mkOption {
+ description = "The name of services's user";
+ type = str;
+ default = "root";
+ };
+ remote = lib.mkOption {
+ description = "Optional url of remote repository";
+ type = nullOr str;
+ default = null;
+ };
+ branch = lib.mkOption {
+ description = "Optional branch in remote repository";
+ type = nullOr str;
+ default = null;
+ };
+ };
+ });
+ };
+ config.systemd.services = lib.mapAttrs' mkSystemdService config.services.gitwatch;
+}