From a60efd7042832a3af80ded14a329eeb8c66760f7 Mon Sep 17 00:00:00 2001
From: Luke Craig <lacraig3@gmail.com>
Date: Tue, 9 Jun 2026 16:42:56 -0400
Subject: [PATCH] ltrace: drop broken 32-bit fallback for mips64

mips64eb/mips64el are in iglooExcludedArchs (no 64-bit MIPS ltrace build),
and iglooFallbackArchs symlinked them to the 32-bit mipsel/mipseb ltrace.
That symlink can't run on a mips64 guest: the 32-bit binary needs the
32-bit musl loader + libc, but penguin only mounts the arch's own 64-bit
/igloo/dylibs, so 'ltrace -V' fails with an ELF/ABI mismatch and breaks the
penguin-tools actuation test. Drop the fallback so mips64 ships no ltrace,
matching riscv64/loongarch.
---
 src/pkgs/ltrace.nix | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/src/pkgs/ltrace.nix b/src/pkgs/ltrace.nix
index 4aecce1..ef1d42a 100644
--- a/src/pkgs/ltrace.nix
+++ b/src/pkgs/ltrace.nix
@@ -62,9 +62,10 @@ pkgs.ltrace.overrideAttrs (prev: {
       "riscv64"
       "loongarch"
     ];
-    iglooFallbackArchs = {
-      mips64eb = "mipseb";
-      mips64el = "mipsel";
-    };
+    # No iglooFallbackArchs: ltrace has no 64-bit MIPS build, and symlinking the
+    # 32-bit mipsel/mipseb binary does not work on a mips64 guest -- it needs the
+    # 32-bit musl loader + libc, but penguin only mounts the arch's own (64-bit)
+    # /igloo/dylibs, so the fallback ltrace fails to start. Treat mips64 like
+    # riscv64/loongarch (no ltrace) instead of shipping a broken symlink.
   };
 })