refactor(ops/modules): Move journaldriver configuration into module r/3847

This makes the journaldriver configuration machine-independent.
The secret is loaded from agenix instead of being persisted on disk.

Change-Id: I592ae7f5726fcb7f37a406f69dcf5ac498eeb1b7
Reviewed-on: https://cl.tvl.fyi/c/depot/+/5302
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/ops/modules/journaldriver.nix b/ops/modules/journaldriver.nix
new file mode 100644
index 000000000000..0d6b0bcc7f63
--- /dev/null
+++ b/ops/modules/journaldriver.nix
@@ -0,0 +1,26 @@
+# Configures journaldriver to forward to the tvl-fyi GCP project from
+# TVL machines.
+{ config, depot, lib, pkgs, ... }:
+
+{
+  imports = [
+    (depot.third_party.agenix.src + "/modules/age.nix")
+  ];
+
+  age.secrets.journaldriver.file = depot.ops.secrets."journaldriver.age";
+
+  services.journaldriver = {
+    enable = true;
+    googleCloudProject = "tvl-fyi";
+    logStream = config.networking.hostName;
+  };
+
+  # Override the systemd service defined in the nixpkgs module to use
+  # the credentials provided by agenix.
+  systemd.services.journaldriver = {
+    serviceConfig = {
+      LoadCredential = "journaldriver.json:/run/agenix/journaldriver";
+      ExecStart = lib.mkForce "${pkgs.coreutils}/bin/env GOOGLE_APPLICATION_CREDENTIALS=\"\${CREDENTIALS_DIRECTORY}/journaldriver.json\" ${depot.ops.journaldriver}/bin/journaldriver";
+    };
+  };
+}