no follows for emacs overlay, so bincache works

flake.lock

@@ -1,5 +1,24 @@
 {
   "nodes": {
+    "emacs-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1666691950,
+        "narHash": "sha256-0+gJByTBEY/GlXXaV6b40ZgRJ0tH7YZubLGCQdVJFww=",
+        "owner": "nix-community",
+        "repo": "emacs-overlay",
+        "rev": "87099c473e76a499ee78fcc4cda9f7c0a88db0ca",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "emacs-overlay",
+        "type": "github"
+      }
+    },
     "fenix": {
       "inputs": {
         "nixpkgs": [
@@ -8,11 +27,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1666594927,
+        "lastModified": 1666681245,
-        "narHash": "sha256-ESd0+5nb59Bpg6zzdGrpNWnQwwGW/KMWBIiabHNeUQU=",
+        "narHash": "sha256-zrTNsPi/aGxixmdXC20gL2MZ1JbIG1ePPXovDSEO6Y4=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "ee0887d7cb28d1dc7527bb129dff888bf41de7cb",
+        "rev": "736b83b304d0a75e863170ecd2b60618e882825c",
         "type": "github"
       },
       "original": {
@@ -51,9 +70,24 @@
         "type": "github"
       }
     },
+    "flake-utils_3": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "microvm": {
       "inputs": {
-        "flake-utils": "flake-utils_2",
+        "flake-utils": "flake-utils_3",
         "nixpkgs": [
           "nixpkgs"
         ]
@@ -76,16 +110,13 @@
       "locked": {
         "lastModified": 1666528161,
         "narHash": "sha256-PFOQSC0x4xPD1p/GZIbpKuoEBu6M8HnEOeNRiBUCELA=",
-        "owner": "NixOS",
+        "path": "/nix/store/ml0shjsrv72lsa3l43aci55wxpc18bpk-source",
-        "repo": "nixpkgs",
         "rev": "471d92178b978fcbad8db27c2e8a4e737d4e0e27",
-        "type": "github"
+        "type": "path"
       },
       "original": {
-        "owner": "NixOS",
+        "id": "nixpkgs",
-        "ref": "nixos-22.05",
+        "type": "indirect"
-        "repo": "nixpkgs",
-        "type": "github"
       }
     },
     "nixpkgs-22_05": {
@@ -106,11 +137,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1666539104,
+        "lastModified": 1666629043,
-        "narHash": "sha256-jeuC+d375wHHxMOFLgu7etseCQVJuPNKoEc9X9CsErg=",
+        "narHash": "sha256-Yoq6Ut2F3Ol73yO9hG93x6ts5c4F5BhKTbcF3DtBEAw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0e6df35f39651504249a05191f9a78d251707e22",
+        "rev": "b39fd6e4edef83cb4a135ebef98751ce23becc33",
         "type": "github"
       },
       "original": {
@@ -120,12 +151,29 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1666610816,
+        "narHash": "sha256-q4F2VNe5bpxXOvp16DyLwE1SgNZMbNO29ZQJPIomedg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "6107f97012a0c134c5848125b5aa1b149b76d2c9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-22.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
+        "emacs-overlay": "emacs-overlay",
         "fenix": "fenix",
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
         "microvm": "microvm",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_2",
         "nixpkgs-unstable": "nixpkgs-unstable",
         "sops-nix": "sops-nix"
       }
@@ -133,11 +181,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1666540927,
+        "lastModified": 1666620525,
-        "narHash": "sha256-rKESGm1up385ecSGp5txbvOkxRRS8SX88oWI8UubOkA=",
+        "narHash": "sha256-XL/8MDKydIni4ObTvuXBOVT+i87TLlutFPxYcd0Cy8I=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "43fb9563b2943d6abc5f3552195f3e27ac618966",
+        "rev": "53b6d69e931a52cca44ef94c3b713b4d255754b8",
         "type": "github"
       },
       "original": {

flake.nix

@@ -20,16 +20,19 @@
       url = github:nix-community/fenix;
       inputs.nixpkgs.follows = "nixpkgs-unstable";
     };
+
+    emacs-overlay.url = github:nix-community/emacs-overlay;
   };
 
   outputs =
     inputs@{ self
+    , emacs-overlay
+    , fenix
+    , flake-utils
+    , microvm
     , nixpkgs
     , nixpkgs-unstable
-    , flake-utils
     , sops-nix
-    , microvm
-    , fenix
     , ...
     }:
 
@@ -57,6 +60,7 @@
             ./modules/basic-tools.nix
             ./modules/binary-caches.nix
             ./modules/devtools.nix
+            ./modules/emacs.nix
             ./modules/gnupg.nix
             ./modules/graphical.nix
             ./modules/hw-accel-intel.nix

modules/emacs.nix

@@ -1,10 +1,14 @@
-{ pkgs, ... }:
+{ pkgs, inputs, ... }:
 
 {
   environment.systemPackages = with pkgs; [
     direnv
   ];
 
+  nixpkgs.overlays = [
+    inputs.emacs-overlay.overlay
+  ];
+
   programs.zsh.shellInit = ''
     eval "$(direnv hook zsh)"
   '';