1 files changed, 83 insertions, 0 deletions
diff --git a/krebs/3modules/github-hosts-sync.nix b/krebs/3modules/github-hosts-sync.nix
new file mode 100644
index 000000000..0274b9d15
--- /dev/null
+++ b/krebs/3modules/github-hosts-sync.nix
@@ -0,0 +1,83 @@
+{ config, lib, pkgs, ... }:
+
+with builtins;
+with lib;
+let
+  cfg = config.krebs.github-hosts-sync;
+
+  out = {
+    options.krebs.github-hosts-sync = api;
+    config = mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkEnableOption "krebs.github-hosts-sync";
+    port = mkOption {
+      type = types.int; # TODO port type
+      default = 1028;
+    };
+    dataDir = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/var/lib/github-hosts-sync";
+    };
+    ssh-identity-file = mkOption {
+      type = types.str; # TODO must be named *.ssh.{id_rsa,id_ed25519}
+      default = "/root/src/secrets/github-hosts-sync.ssh.id_rsa";
+    };
+  };
+
+  imp = {
+    systemd.services.github-hosts-sync = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      environment = {
+        port = toString cfg.port;
+      };
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "github-hosts-sync";
+        User = user.name;
+        Restart = "always";
+        ExecStartPre = pkgs.writeScript "github-hosts-sync-init" ''
+          #! /bin/sh
+          set -euf
+
+          ssh_identity_file_target=$(
+            case ${cfg.ssh-identity-file} in
+              *.ssh.id_rsa|*.ssh.id_ed25519) echo ${cfg.dataDir}/.ssh/id_rsa;;
+              *.ssh.id_ed25519) echo ${cfg.dataDir}/.ssh/id_ed25519;;
+              *)
+                echo "bad identity file name: ${cfg.ssh-identity-file}" >&2
+                exit 1
+            esac
+          )
+
+          mkdir -p ${cfg.dataDir}
+          chown ${user.name}: ${cfg.dataDir}
+
+          install \
+            -o ${user.name} \
+            -m 0400 \
+            ${cfg.ssh-identity-file} \
+            "$ssh_identity_file_target"
+
+          ln -snf ${kpkgs.github-known_hosts} ${cfg.dataDir}/.ssh/known_hosts
+        '';
+        ExecStart = "${kpkgs.github-hosts-sync}/bin/github-hosts-sync";
+      };
+    };
+
+    users.extraUsers = singleton {
+      inherit (user) name uid;
+      home = cfg.dataDir;
+    };
+  };
+
+  user = {
+    name = "github-hosts-sync";
+    uid = 3220554646; # genid github-hosts-sync
+  };
+
+  kpkgs = import ../../krebs/5pkgs { inherit pkgs; };
+in
+out