lib/wrapModule: add postHook

lib/default.nix

@@ -380,13 +380,14 @@ let
     - `flagSeparator`: Separator between flag names and values when generating args from flags (optional, defaults to " ")
     - `args`: List of command-line arguments like argv in execve (optional, auto-generated from flags if not provided)
     - `preHook`: Shell script to run before executing the command (optional)
+    - `postHook`: Shell script to run after executing the command, removes the `exec` call. use with care (optional)
     - `passthru`: Attribute set to pass through to the wrapped derivation (optional)
     - `aliases`: List of additional names to symlink to the wrapped executable (optional)
     - `filesToPatch`: List of file paths (glob patterns) to patch for self-references (optional, defaults to ["share/applications/*.desktop"])
     - `filesToExclude`: List of file paths (glob patterns) to exclude from the wrapped package (optional, defaults to [])
     - `patchHook`: Shell script that runs after patchPhase to modify the wrapper package files (optional)
     - `wrapper`: Custom wrapper function (optional, defaults to exec'ing the original binary with args)
-      - Called with { env, flags, args, envString, flagsString, exePath, preHook }
+      - Called with { env, flags, args, envString, flagsString, exePath, preHook, postHook }
 
     # Example
 
@@ -446,6 +447,7 @@ let
       # " " for "--flag value" or "=" for "--flag=value"
       args ? generateArgsFromFlags flags flagSeparator,
       preHook ? "",
+      postHook ? "",
       passthru ? { },
       aliases ? [ ],
       # List of file paths (glob patterns) relative to package root to patch for self-references (e.g., ["bin/*", "lib/*.sh"])
@@ -459,12 +461,14 @@ let
           flagsString,
           envString,
           preHook,
+          postHook,
           ...
         }:
         ''
           ${envString}
           ${preHook}
-          exec ${exePath}${flagsString} "$@"
+          ${lib.optionalString (postHook == "") "exec"} ${exePath}${flagsString} "$@"
+          ${postHook}
         ''
       ),
     }@funcArgs:
@@ -497,6 +501,7 @@ let
           flagsString
           exePath
           preHook
+          postHook
           ;
       };
 
@@ -654,6 +659,7 @@ let
                 flags
                 args
                 preHook
+                postHook
                 aliases
                 ;
               override =

lib/modules/wrapper.nix

@@ -99,6 +99,15 @@
       Shell script to run before executing the command.
     '';
   };
+  options.postHook = lib.mkOption {
+    type = lib.types.str;
+    default = "";
+    description = ''
+      Shell script to run after executing the command.
+      Removes the `exec` call in the wrapper script which will leave a bash process
+      in the background, therefore use with care.
+    '';
+  };
   options.exePath = lib.mkOption {
     type = lib.types.path;
     description = ''
@@ -138,6 +147,7 @@
       filesToPatch = config.filesToPatch;
       filesToExclude = config.filesToExclude;
       preHook = config.preHook;
+      postHook = config.postHook;
       patchHook = config.patchHook;
       passthru = {
         configuration = config;