disable cachix cache

flake.nix

@@ -114,13 +114,11 @@
     extra-substituters = [
       "https://nix-community.cachix.org"
       "https://cache.garnix.io"
-      "https://cything.cachix.org"
       "https://cache.cy7.sh/main"
     ];
     extra-trusted-public-keys = [
       "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
       "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
-      "cything.cachix.org-1:xqW1W5NNL+wrM9wfSELb0MLj/harD2ZyB4HbdaMyvPI="
       "main:Ku31HoEWcBtfggge2VGj+QTkVrQuIwRIMGyfV/5VQP0="
     ];
     builders-use-substitutes = true;

hosts/common.nix

@@ -10,17 +10,13 @@
         "@wheel"
       ];
       trusted-public-keys = [
-        "niri.cachix.org-1:Wv0OmO7PsuocRKzfDoJ3mulSl7Z6oezYhGhR+3W2964="
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
         "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="
-        "cything.cachix.org-1:xqW1W5NNL+wrM9wfSELb0MLj/harD2ZyB4HbdaMyvPI="
         "main:Ku31HoEWcBtfggge2VGj+QTkVrQuIwRIMGyfV/5VQP0="
       ];
       substituters = [
-        "https://niri.cachix.org"
         "https://nix-community.cachix.org"
         "https://cache.garnix.io"
-        "https://cything.cachix.org"
         "https://cache.cy7.sh/main"
       ];
     };

overlay/attic/default.nix

@@ -0,0 +1,7 @@
+final: prev: {
+  attic-server = prev.attic-server.overrideAttrs {
+    patches = [
+      ./prefetch-32-chunks.patch
+    ];
+  };
+}

overlay/attic/prefetch-32-chunks.patch

@@ -0,0 +1,13 @@
+diff --git a/server/src/api/binary_cache.rs b/server/src/api/binary_cache.rs
+index 02e4857..71eeee8 100644
+--- a/server/src/api/binary_cache.rs
++++ b/server/src/api/binary_cache.rs
+@@ -262,7 +262,7 @@ async fn get_nar(
+ 
+         // TODO: Make num_prefetch configurable
+         // The ideal size depends on the average chunk size
+-        let merged = merge_chunks(chunks, streamer, storage, 2).map_err(|e| {
++        let merged = merge_chunks(chunks, streamer, storage, 32).map_err(|e| {
+             tracing::error!(%e, "Stream error");
+             e
+         });

overlay/default.nix

@@ -3,6 +3,7 @@ let
   overlays = [
     ./zipline
     ./bitwarden
+    ./attic
   ];
   importedOverlays = map (m: import m) overlays;
 in