From e930241af7ab8da7fac61c51824b09cc2ffeca5a Mon Sep 17 00:00:00 2001
From: Mikael Voss <mvs@nyantec.com>
Date: Thu, 3 Oct 2024 16:25:45 +0200
Subject: [PATCH] package/hush: Add minimal POSIX shell

---
 home/config/nil/home.nix |  3 +++
 package/hush.nix         | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 package/hush.nix

diff --git a/home/config/nil/home.nix b/home/config/nil/home.nix
index 1bfd256..ff1dc58 100644
--- a/home/config/nil/home.nix
+++ b/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)
 
diff --git a/package/hush.nix b/package/hush.nix
new file mode 100644
index 0000000..c7bf0cc
--- /dev/null
+++ b/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
+  '';
+}