package/hush: Add minimal POSIX shell

home/config/nil/home.nix

@@ -34,6 +34,9 @@ in {
     # Terminfo
     kitty.terminfo
 
+    # Minimal POSIX shell
+    self.packages.${system}.hush
+
     # Core utilities
     (lib.meta.setPrio 0 uutils-coreutils-noprefix)
 

package/hush.nix

@@ -0,0 +1,20 @@
+{ ... }: { busybox }:
+
+(busybox.overrideAttrs (prevAttrs: {
+  postInstall = ''
+    mv $out/bin/{busybox,sh}
+  '';
+
+  meta = prevAttrs.meta // {
+    mainProgram = "sh";
+  };
+})).override {
+  enableMinimal = true;
+  enableAppletSymlinks = false;
+  extraConfig = ''
+    CONFIG_PIE y
+
+    CONFIG_SH_IS_ASH n
+    CONFIG_SH_IS_HUSH y
+  '';
+}