diff --git a/.github/workflows/cachix.yml b/.github/workflows/cachix.yml
index fb6a2ef..6e0d877 100644
--- a/.github/workflows/cachix.yml
+++ b/.github/workflows/cachix.yml
@@ -18,7 +18,17 @@ jobs:
           GIT_CRYPT_KEY: ${{ secrets.GIT_CRYPT_KEY }}
       - name: Wait..
         run:
-          sleep 20;
+          for s in {1..10}; do
+            nix eval .#checks.x86_64-linux.is_dirty;
+            if [ $? -eq 0 ]; then
+              break;
+            else
+              if [ $s -eq 10 ]; then
+                exit 1
+              fi
+              sleep 5;
+            fi
+          done
       - uses: cachix/install-nix-action@v31
       - uses: cachix/cachix-action@v14
         with:
diff --git a/flake.nix b/flake.nix
index 98a4505..98ffdac 100644
--- a/flake.nix
+++ b/flake.nix
@@ -78,6 +78,8 @@
       nixosConfigurations."hazel" = mkSystem nixpkgs-stable "hazel" "x86_64-linux" [];
       nixosConfigurations."hyacinth" = mkSystem nixpkgs "hyacinth" "x86_64-linux" [];
 
+      checks."x86_64-linux".is_dirty = if !(self ? rev) then throw "Dirty git tree detected." else self.rev;
+
       packages."x86_64-linux" =
         let
           pkgs = import nixpkgs rec {