From 8b08408e9794f94e932b9cfd844c1d14dabdf2b8 Mon Sep 17 00:00:00 2001
From: Audrey Dutcher <audrey@rhelmot.io>
Date: Sat, 30 Nov 2024 00:44:02 -0700
Subject: [PATCH] openbsd.makedev: init

MAKEDEV is a shell script that can generate OpenBSD device nodes. It is
useful on an OpenBSD system for disaster recovery and also on a
non-OpenBSD system for cross-compilation.
---
 .../bsd/openbsd/pkgs/makedev/bash.patch       | 18 +++++++++
 .../bsd/openbsd/pkgs/makedev/package.nix      | 37 +++++++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 pkgs/os-specific/bsd/openbsd/pkgs/makedev/bash.patch
 create mode 100644 pkgs/os-specific/bsd/openbsd/pkgs/makedev/package.nix

diff --git a/pkgs/os-specific/bsd/openbsd/pkgs/makedev/bash.patch b/pkgs/os-specific/bsd/openbsd/pkgs/makedev/bash.patch
new file mode 100644
index 000000000000..06993c0066d7
--- /dev/null
+++ b/pkgs/os-specific/bsd/openbsd/pkgs/makedev/bash.patch
@@ -0,0 +1,18 @@
+diff --git a/etc/MAKEDEV.common b/etc/MAKEDEV.common
+index 1e7bb3d235a..1cc64a38985 100644
+--- a/etc/MAKEDEV.common
++++ b/etc/MAKEDEV.common
+@@ -315,10 +315,10 @@ _mkdev(pty, pty*, {-if [ $U -gt 15 ]; then
+ 		echo bad unit for pty in: $i
+ 		continue
+ 	fi
+-	set -A letters p q r s t u v w x y z P Q R S T
+-	set -A suffixes 0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q \
++	letters=(p q r s t u v w x y z P Q R S T)
++	suffixes=(0 1 2 3 4 5 6 7 8 9 a b c d e f g h i j k l m n o p q \
+ 	    r s t u v w x y z A B C D E F G H I J K L M N O P Q R S T U V W X \
+-	    Y Z
++	    Y Z)
+ 
+ 	name=${letters[$U]}
+ 	n=0
diff --git a/pkgs/os-specific/bsd/openbsd/pkgs/makedev/package.nix b/pkgs/os-specific/bsd/openbsd/pkgs/makedev/package.nix
new file mode 100644
index 000000000000..48f5b7176b20
--- /dev/null
+++ b/pkgs/os-specific/bsd/openbsd/pkgs/makedev/package.nix
@@ -0,0 +1,37 @@
+{
+  mkDerivation,
+  runtimeShell,
+  m4,
+}:
+
+mkDerivation {
+  pname = "MAKEDEV";
+  path = "etc";
+
+  patches = [ ./bash.patch ];
+
+  extraNativeBuildInputs = [
+    m4
+  ];
+
+  preBuild = ''
+    mkdir -p $out/share/doc
+  '';
+  buildTargets = [ "MAKEDEV" ];
+
+  # patch some build artifacts
+  # gnu m4 doesn't seem to recognize the expr() macro but it's only used for simple arithmetic so we convert it to bash
+  postBuild = ''
+    substituteInPlace etc.$TARGET_MACHINE_ARCH/MAKEDEV --replace-fail "/bin/sh -" "${runtimeShell}"
+    sed -E -i -e '/^PATH=.*/d' -e 's/expr\((.*)\)/$((\1))/g' etc.$TARGET_MACHINE_ARCH/MAKEDEV
+  '';
+
+  # The install procedure is also weird since this is supposed to live in /dev
+  postInstall = ''
+    mkdir -p $out/bin
+    cp etc.$TARGET_MACHINE_ARCH/MAKEDEV $out/bin
+    chmod +x $out/bin/MAKEDEV
+  '';
+
+  meta.mainProgram = "MAKEDEV";
+}