From f369c711dd8bd6eec6905645dab9a153ebbba0a8 Mon Sep 17 00:00:00 2001
From: eldritch horrors <pennae@lix.systems>
Date: Mon, 3 Nov 2025 15:49:36 +0100
Subject: [PATCH] libutil: prefer reporting libarchive source errors

if curl fails during a transfer and said transfer is piped through
libarchive we see very strange errors (#1009). in such cases we'll
want to prioritize reporting the source errors to allow debugging.

Change-Id: I8cc231257eca5b749471ecd38df15071170decc2
---
 lix/libutil/compression.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lix/libutil/compression.cc b/lix/libutil/compression.cc
index a351dce67..483c6d5b1 100644
--- a/lix/libutil/compression.cc
+++ b/lix/libutil/compression.cc
@@ -417,7 +417,10 @@ struct DecompressionStream : DecompressorPipes, AsyncInputStream
             if (const auto got = ::read(uncompressed.readSide.get(), buffer, size); got > 0) {
                 co_return got;
             } else if (got == 0) {
-                // decompresser must have finished, poll for any errors and return EOF
+                if (feedExc) {
+                    std::rethrow_exception(feedExc);
+                }
+                // decompresser must have finished, poll for any errors and return EOF.
                 thread.get();
                 co_return std::nullopt;
             } else if (errno == EAGAIN || errno == EWOULDBLOCK) {