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nixng-configurations/attic.nix

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+{...}: {
+  dinit.enable = true;
+  init.services.attic.shutdownOnExit = true;
+
+  services.attic = {
+    enable = true;
+
+    settings = {
+      # The '+" is to explicitly denote the end of the Vals expression.
+      # This is done because we quote the template for the toml file.
+      # See: https://github.com/helmfile/vals?tab=readme-ov-file#expression-syntax
+      # database.url = "ref+sops://secrets.yml#attic/databaseURL+";
+      database = {};
+
+      storage = {
+        type = "local";
+        path = "/var/lib/atticd/storage";
+      };
+
+      listen = "[::]:8080";
+
+      # Data chunking
+      #
+      # Warning: If you change any of the values here, it will be
+      # difficult to reuse existing chunks for newly-uploaded NARs
+      # since the cutpoints will be different. As a result, the
+      # deduplication ratio will suffer for a while after the change.
+      chunking = {
+        # The minimum NAR size to trigger chunking
+        #
+        # If 0, chunking is disabled entirely for newly-uploaded NARs.
+        # If 1, all NARs are chunked.
+        nar-size-threshold = 64 * 1024; # 64 KiB
+
+        # The preferred minimum size of a chunk, in bytes
+        min-size = 16 * 1024; # 16 KiB
+
+        # The preferred average size of a chunk, in bytes
+        avg-size = 64 * 1024; # 64 KiB
+
+        # The preferred maximum size of a chunk, in bytes
+        max-size = 256 * 1024; # 256 KiB
+      };
+    };
+  };
+}