From d8e1751e18251c5cec502187f24c69eeef1466fe Mon Sep 17 00:00:00 2001
From: Sascha Grunert <sgrunert@redhat.com>
Date: Wed, 24 Apr 2024 10:17:34 +0200
Subject: [PATCH] Build s390x binaries using musl libc

Building using musl until NixOS/nixpkgs#306473
is resolved.

Signed-off-by: Sascha Grunert <sgrunert@redhat.com>
---
 nix/default-s390x.nix |  5 ++++-
 nix/derivation.nix    | 25 +++++++++++++++----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/nix/default-s390x.nix b/nix/default-s390x.nix
index d1dd365b6e..3257cc69ad 100644
--- a/nix/default-s390x.nix
+++ b/nix/default-s390x.nix
@@ -1,7 +1,10 @@
 { enableSystemd ? false }:
 (import ./nixpkgs.nix {
   crossSystem = {
-    config = "s390x-unknown-linux-gnu";
+    # TODO: Switch back to glibc when
+    # https://github.com/NixOS/nixpkgs/issues/306473
+    # is resolved.
+    config = "s390x-unknown-linux-musl";
   };
   overlays = [ (import ./overlay.nix) ];
 }).callPackage ./derivation.nix
diff --git a/nix/derivation.nix b/nix/derivation.nix
index add7fc771e..078686d9db 100644
--- a/nix/derivation.nix
+++ b/nix/derivation.nix
@@ -1,4 +1,5 @@
-{ pkgs
+{ stdenv
+, pkgs
 , enableCriu
 , enableSystemd
 }:
@@ -17,21 +18,25 @@ with pkgs; stdenv.mkDerivation {
     python3
     which
   ];
-  buildInputs = [
-    glibc
-    glibc.static
-    libcap
-    libseccomp
-    libsystemd
-    yajl
-  ] ++ lib.optionals enableCriu [ criu ];
+  buildInputs =
+    (if stdenv.hostPlatform.isMusl then [
+      argp-standalone
+    ] else [
+      glibc
+      glibc.static
+    ]) ++ [
+      libcap
+      libseccomp
+      libsystemd
+      yajl
+    ] ++ lib.optionals enableCriu [ criu ];
   configureFlags = [ "--enable-static" ] ++ lib.optional (!enableSystemd) [ "--disable-systemd" ];
   prePatch = ''
     export CFLAGS='-static -pthread'
     export LDFLAGS='-s -w -static-libgcc -static'
     export EXTRA_LDFLAGS='-s -w -linkmode external -extldflags "-static -lm"'
     export CRUN_LDFLAGS='-all-static'
-    export LIBS='${lib.optionalString enableCriu "${criu}/lib/libcriu.a"} ${glibc.static}/lib/libc.a ${glibc.static}/lib/libpthread.a ${glibc.static}/lib/librt.a ${lib.getLib libcap}/lib/libcap.a ${lib.getLib libseccomp}/lib/libseccomp.a ${lib.optionalString enableSystemd "${lib.getLib libsystemd}/lib/libsystemd.a"} ${yajl}/lib/libyajl.a'
+    export LIBS='${lib.optionalString enableCriu "${criu}/lib/libcriu.a"} ${if stdenv.hostPlatform.isMusl then "${musl}/lib/libc.a ${musl}/lib/libpthread.a ${musl}/lib/librt.a" else "${glibc.static}/lib/libc.a ${glibc.static}/lib/libpthread.a ${glibc.static}/lib/librt.a"} ${lib.getLib libcap}/lib/libcap.a ${lib.getLib libseccomp}/lib/libseccomp.a ${lib.optionalString enableSystemd "${lib.getLib libsystemd}/lib/libsystemd.a"} ${yajl}/lib/libyajl.a'
   '';
   buildPhase = ''
     patchShebangs .