build: add nbd to nix devshell

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flake.lock

@@ -18,7 +18,38 @@
         "type": "github"
       }
     },
+    "nbd": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      },
+      "locked": {
+        "path": "./nbd",
+        "type": "path"
+      },
+      "original": {
+        "path": "./nbd",
+        "type": "path"
+      },
+      "parent": []
+    },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1771369470,
+        "narHash": "sha256-0NBlEBKkN3lufyvFegY4TYv5mCNHbi5OmBDrzihbBMQ=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0182a361324364ae3f436a63005877674cf45efb",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
       "locked": {
         "lastModified": 1770843696,
         "narHash": "sha256-LovWTGDwXhkfCOmbgLVA10bvsi/P8eDDpRudgk68HA8=",
@@ -37,11 +68,33 @@
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs",
+        "nbd": "nbd",
-        "rust-overlay": "rust-overlay"
+        "nixpkgs": "nixpkgs_2",
+        "rust-overlay": "rust-overlay_2"
       }
     },
     "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nbd",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1771816254,
+        "narHash": "sha256-vkp3iTF6QmHMvL+34DI93IiMPjS2lqcMlA1fl7nXVsQ=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "085bdbf5dde5477538e4c87d1684b6c6df56c0ad",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "rust-overlay_2": {
       "inputs": {
         "nixpkgs": [
           "nixpkgs"

flake.nix

@@ -8,9 +8,10 @@
       url = "github:oxalica/rust-overlay";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    nbd.url = "path:./nbd";
   };
 
-  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
+  outputs = { self, nixpkgs, flake-utils, rust-overlay, nbd }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         overlays = [ (import rust-overlay) ];
@@ -49,6 +50,9 @@
 
             # jq for json parsing
             pkgs.jq
+
+            # NBD task management
+            nbd.packages.${system}.nbd
           ];
 
           shellHook = ''