clan-cli: use dependency flake instead of registry

pkgs/clan-cli/clan_cli/dirs.py

@@ -1,3 +1,4 @@
+import json
 import os
 import sys
 from pathlib import Path
@@ -30,12 +31,15 @@ def module_root() -> Path:
     return Path(__file__).parent
 
 
-def flake_registry() -> Path:
-    return module_root() / "nixpkgs" / "flake-registry.json"
+def deps_flake() -> Path:
+    return module_root() / "deps_flake"
 
 
 def nixpkgs() -> Path:
-    return (module_root() / "nixpkgs" / "path").resolve()
+    # load the flake.lock json file from the deps_flake and return nodes.nixpkgs.path
+    with open(deps_flake() / "flake.lock") as f:
+        flake_lock = json.load(f)
+    return Path(flake_lock["nodes"]["nixpkgs"]["locked"]["path"])
 
 
 def unfree_nixpkgs() -> Path:

pkgs/clan-cli/clan_cli/nix.py

@@ -1,7 +1,7 @@
 import os
 import tempfile
 
-from .dirs import flake_registry, unfree_nixpkgs
+from .dirs import nixpkgs, unfree_nixpkgs
 
 
 def nix_eval(flags: list[str]) -> list[str]:
@@ -13,8 +13,9 @@ def nix_eval(flags: list[str]) -> list[str]:
                 "--show-trace",
                 "--extra-experimental-features",
                 "nix-command flakes",
-                "--flake-registry",
-                str(flake_registry()),
+                "--override-input",
+                "nixpkgs",
+                str(nixpkgs()),
                 # --store is required to prevent this error:
                 # error: cannot unlink '/nix/store/6xg259477c90a229xwmb53pdfkn6ig3g-default-builder.sh': Operation not permitted
                 "--store",
@@ -41,8 +42,8 @@ def nix_shell(packages: list[str], cmd: list[str]) -> list[str]:
             "shell",
             "--extra-experimental-features",
             "nix-command flakes",
-            "--flake-registry",
-            str(flake_registry()),
+            "--inputs-from",
+            ".#",
         ]
         + wrapped_packages
         + ["-c"]