Support config file path, add NixOS module with mode option

1 files changed, 17 insertions, 0 deletions

diff --git a/default.nix b/default.nix
index fa9d521..4ae9a74 100644
--- a/default.nix
+++ b/default.nix
@@ -28,6 +28,23 @@ rustPlatform.buildRustPackage (finalAttrs: {
     pam
   ];
 
+  # Support reading config from a file path instead of only inline JSON,
+  # since NixOS appends comments to PAM rule lines which breaks JSON parsing.
+  postPatch = ''
+    substituteInPlace src/lib.rs \
+      --replace-fail \
+        'let arg_string = args.iter().map(|s| s.to_str().unwrap()).collect::<Vec<_>>().join(" ");' \
+        'let arg_string = {
+            let joined = args.iter().map(|s| s.to_str().unwrap()).collect::<Vec<_>>().join(" ");
+            if joined.starts_with("/") {
+                std::fs::read_to_string(joined.split_whitespace().next().unwrap())
+                    .unwrap_or(joined)
+            } else {
+                joined
+            }
+        };'
+  '';
+
   # cdylib produces no binaries, only libpam_any.so
   installPhase = ''
     runHook preInstall