From e7fd175e979f509f407e06214cf69321eec93f03 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Maciej=20Kr=C3=BCger?= <mkg20001@gmail.com>
Date: Wed, 3 Nov 2021 14:28:09 +0100
Subject: [PATCH] nixos/lxd-image-server: init

Co-authored-by: Aaron Andersen <aaron@fosslib.net>
---
 nixos/modules/module-list.nix                 |   1 +
 .../services/networking/lxd-image-server.nix  | 138 ++++++++++++++++++
 2 files changed, 139 insertions(+)
 create mode 100644 nixos/modules/services/networking/lxd-image-server.nix

diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index eed0b802b95..dc152848fb4 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -772,6 +772,7 @@
   ./services/networking/libreswan.nix
   ./services/networking/lldpd.nix
   ./services/networking/logmein-hamachi.nix
+  ./services/networking/lxd-image-server.nix
   ./services/networking/mailpile.nix
   ./services/networking/magic-wormhole-mailbox-server.nix
   ./services/networking/matterbridge.nix
diff --git a/nixos/modules/services/networking/lxd-image-server.nix b/nixos/modules/services/networking/lxd-image-server.nix
new file mode 100644
index 00000000000..5ec6cacffa4
--- /dev/null
+++ b/nixos/modules/services/networking/lxd-image-server.nix
@@ -0,0 +1,138 @@
+{ config, pkgs, lib, ... }:
+
+with lib;
+
+let
+  cfg = config.services.lxd-image-server;
+  format = pkgs.formats.toml {};
+
+  location = "/var/www/simplestreams";
+in
+{
+  options = {
+    services.lxd-image-server = {
+      enable = mkEnableOption "lxd-image-server";
+
+      group = mkOption {
+        type = types.str;
+        description = "Group assigned to the user and the webroot directory.";
+        default = "nginx";
+        example = "www-data";
+      };
+
+      settings = mkOption {
+        type = format.type;
+        description = ''
+          Configuration for lxd-image-server.
+
+          Example see <link xlink:href="https://github.com/Avature/lxd-image-server/blob/master/config.toml"/>.
+        '';
+        default = {};
+      };
+
+      nginx = {
+        enable = mkEnableOption "nginx";
+        domain = mkOption {
+          type = types.str;
+          description = "Domain to use for nginx virtual host.";
+          example = "images.example.org";
+        };
+      };
+    };
+  };
+
+  config = mkMerge [
+    (mkIf (cfg.enable) {
+      users.users.lxd-image-server = {
+        isSystemUser = true;
+        group = cfg.group;
+      };
+      users.groups.${cfg.group} = {};
+
+      environment.etc."lxd-image-server/config.toml".source = format.generate "config.toml" cfg.settings;
+
+      services.logrotate.paths.lxd-image-server = {
+        path = "/var/log/lxd-image-server/lxd-image-server.log";
+        frequency = "daily";
+        keep = 21;
+        user = "lxd-image-server";
+        group = cfg.group;
+        extraConfig = ''
+          missingok
+          compress
+          delaycompress
+          copytruncate
+          notifempty
+        '';
+      };
+
+      systemd.tmpfiles.rules = [
+        "d /var/www/simplestreams 0755 lxd-image-server ${cfg.group}"
+      ];
+
+      systemd.services.lxd-image-server = {
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network.target" ];
+
+        description = "LXD Image Server";
+
+        script = ''
+          ${pkgs.lxd-image-server}/bin/lxd-image-server init
+          ${pkgs.lxd-image-server}/bin/lxd-image-server watch
+        '';
+
+        serviceConfig = {
+          User = "lxd-image-server";
+          Group = cfg.group;
+          DynamicUser = true;
+          LogsDirectory = "lxd-image-server";
+          RuntimeDirectory = "lxd-image-server";
+          ExecReload = "${pkgs.lxd-image-server}/bin/lxd-image-server reload";
+          ReadWritePaths = [ location ];
+        };
+      };
+    })
+    # this is seperate so it can be enabled on mirrored hosts
+    (mkIf (cfg.nginx.enable) {
+      # https://github.com/Avature/lxd-image-server/blob/master/resources/nginx/includes/lxd-image-server.pkg.conf
+      services.nginx.virtualHosts = {
+        "${cfg.nginx.domain}" = {
+          forceSSL = true;
+          enableACME = mkDefault true;
+
+          root = location;
+
+          locations = {
+            "/streams/v1/" = {
+              index = "index.json";
+            };
+
+            # Serve json files with content type header application/json
+            "~ \.json$" = {
+              extraConfig = ''
+                add_header Content-Type application/json;
+              '';
+            };
+
+            "~ \.tar.xz$" = {
+              extraConfig = ''
+                add_header Content-Type application/octet-stream;
+              '';
+            };
+
+            "~ \.tar.gz$" = {
+              extraConfig = ''
+                add_header Content-Type application/octet-stream;
+              '';
+            };
+
+            # Deny access to document root and the images folder
+            "~ ^/(images/)?$" = {
+              return = "403";
+            };
+          };
+        };
+      };
+    })
+  ];
+}