1 files changed, 86 insertions, 0 deletions
diff --git a/krebs/3modules/github/hosts-sync.nix b/krebs/3modules/github/hosts-sync.nix
new file mode 100644
index 00000000..2f373f9b
--- /dev/null
+++ b/krebs/3modules/github/hosts-sync.nix
@@ -0,0 +1,86 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  cfg = config.krebs.github-hosts-sync;
+
+  out = {
+    options.krebs.github-hosts-sync = api;
+    config = lib.mkIf cfg.enable imp;
+  };
+
+  api = {
+    enable = mkEnableOption "krebs.github-hosts-sync";
+    dataDir = mkOption {
+      type = types.str; # TODO path (but not just into store)
+      default = "/var/lib/github-hosts-sync";
+    };
+    srcDir = mkOption {
+      type = types.str;
+      default = "${config.krebs.tinc.retiolum.confDir}/hosts";
+      defaultText = "\${config.krebs.tinc.retiolum.confDir}/hosts";
+    };
+    ssh-identity-file = mkOption {
+      type = types.suffixed-str [".ssh.id_ed25519" ".ssh.id_rsa"];
+      default = "${config.krebs.secret.directory}/github-hosts-sync.ssh.id_ed25519";
+      defaultText = "‹secrets/github-hosts-sync.ssh.id_ed25519›";
+    };
+    url = mkOption {
+      type = types.str;
+      default = "git@github.com:krebs/hosts.git";
+    };
+    workTree = mkOption {
+      type = types.absolute-pathname;
+      default = "${cfg.dataDir}/cache";
+    };
+  };
+
+  imp = {
+    systemd.services.github-hosts-sync = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      environment = {
+        GITHUB_HOST_SYNC_USER_MAIL = user.mail;
+        GITHUB_HOST_SYNC_USER_NAME = user.name;
+        GITHUB_HOST_SYNC_SRCDIR = cfg.srcDir;
+        GITHUB_HOST_SYNC_WORKTREE = cfg.workTree;
+        GITHUB_HOST_SYNC_URL = cfg.url;
+      };
+      serviceConfig = {
+        PermissionsStartOnly = "true";
+        SyslogIdentifier = "github-hosts-sync";
+        User = user.name;
+        Type = "oneshot";
+        RemainAfterExit = true;
+        ExecStartPre = pkgs.writeDash "github-hosts-sync-init" ''
+          set -euf
+          install -m 0711 -o ${user.name} -d ${cfg.dataDir}
+          install -m 0700 -o ${user.name} -d ${cfg.dataDir}/.ssh
+          install -m 0400 -o ${user.name} \
+            ${cfg.ssh-identity-file} \
+            ${cfg.dataDir}/.ssh/${fileExtension cfg.ssh-identity-file}
+        '';
+        ExecStart = "${pkgs.github-hosts-sync}/bin/github-hosts-sync";
+      };
+    };
+
+    users.users.${user.name} = {
+      inherit (user) uid;
+      group = user.name;
+      home = cfg.dataDir;
+      isSystemUser = true;
+    };
+  };
+
+  users.groups.${user.name} = {};
+
+  user = rec {
+    mail = "${name}@${config.krebs.build.host.name}";
+    name = "github-hosts-sync";
+    uid = genid_uint31 name;
+  };
+
+  # TODO move to lib?
+  fileExtension = s: last (splitString "." s);
+
+in out