From 006d6b663b477272ea031d75b8fb73570cea7233 Mon Sep 17 00:00:00 2001
From: Abderrahim Kitouni <abderrahim.kitouni@codethink.co.uk>
Date: Mon, 10 Nov 2025 12:18:02 +0100
Subject: [PATCH] _yaml: Split error reporting for parser initialisation

Some versions of ruamel-yaml-clib have a defective aarch64 wheel, but
buildstream was reporting "Severely malformed YAML" instead.
---
 src/buildstream/_yaml.pyx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/buildstream/_yaml.pyx b/src/buildstream/_yaml.pyx
index c962bb881..0097e1e74 100644
--- a/src/buildstream/_yaml.pyx
+++ b/src/buildstream/_yaml.pyx
@@ -296,7 +296,11 @@ cpdef MappingNode load_data(str data, int file_index=node._SYNTHETIC_FILE_INDEX,
     try:
         rep = Representer(file_index)
         parser = yaml.CParser(data)
+    except Exception as e:
+        raise LoadError("YAML parser initialization failed: {}".format(e),
+                        LoadErrorReason.INVALID_YAML) from e
 
+    try:
         try:
             while parser.check_event():
                 rep.handle_event(parser.get_event())