https://bugs.gentoo.org/955816
https://gitlab.com/libosinfo/libosinfo/-/issues/58
https://gitlab.com/libosinfo/libosinfo/-/merge_requests/162

From 0adf38535637ec668e658d43f04f60f11f51574f Mon Sep 17 00:00:00 2001
From: Roman Bogorodskiy <bogorodskiy@gmail.com>
Date: Thu, 10 Apr 2025 13:54:02 +0200
Subject: [PATCH] loader: don't use libxml2 deprecated APIs

Address the following items:

 - Deprecated direct access to buf's content
 - Mismatching error function signature
 - Deprecated direct access to ctxt's lastError

Signed-off-by: Roman Bogorodskiy <bogorodskiy@gmail.com>
--- a/osinfo/osinfo_loader.c
+++ b/osinfo/osinfo_loader.c
@@ -354,7 +354,7 @@ osinfo_loader_doc(const char *xpath,
         xmlXPathFreeObject(obj);
         OSINFO_LOADER_SET_ERROR(err, "Cannot format stylesheet");
     }
-    ret = g_strdup((char *)buf->content);
+    ret = g_strdup((char *)xmlBufferContent(buf));
 
     xmlBufferFree(buf);
     xmlXPathFreeObject(obj);
@@ -1902,28 +1902,32 @@ static void osinfo_loader_root(OsinfoLoader *loader,
 }
 
 static void
-catchXMLError(void *ctx, const char *msg ATTRIBUTE_UNUSED, ...)
+catchXMLError(void *ctx, const char *msg, ...)
 {
     xmlParserCtxtPtr ctxt = (xmlParserCtxtPtr) ctx;
+    const xmlError *xmlErr = NULL;
+    g_autofree gchar *xmlmsg = NULL;
 
-    if (ctxt && ctxt->_private) {
-        GError **err = ctxt->_private;
-        if (!error_is_set(err)) {
-            gchar *xmlmsg;
-            if (ctxt->lastError.file) {
-                xmlmsg = g_strdup_printf("%s:%d: %s",
-                                         ctxt->lastError.file,
-                                         ctxt->lastError.line,
-                                         ctxt->lastError.message);
-            } else {
-                xmlmsg = g_strdup_printf("at line %d: %s",
-                                         ctxt->lastError.line,
-                                         ctxt->lastError.message);
-            }
-            OSINFO_LOADER_SET_ERROR(ctxt->_private, xmlmsg);
-            g_free(xmlmsg);
-        }
+    if (!ctxt || !ctxt->_private)
+        return;
+
+    if (error_is_set(ctxt->_private))
+        return;
+
+    if (!(xmlErr = xmlCtxtGetLastError(ctx)))
+        return;
+
+    if (xmlErr->file) {
+        xmlmsg = g_strdup_printf("%s:%d: %s",
+                                 xmlErr->file,
+                                 xmlErr->line,
+                                 xmlErr->message);
+    } else {
+        xmlmsg = g_strdup_printf("at line %d: %s",
+                                 xmlErr->line,
+                                 xmlErr->message);
     }
+    OSINFO_LOADER_SET_ERROR(ctxt->_private, xmlmsg);
 }
 
 static void osinfo_loader_process_xml(OsinfoLoader *loader,
-- 
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