From 1eb729ef1c795f6b5944dd217994f8d8279672bc Mon Sep 17 00:00:00 2001
From: "Demi M. Obenour" <demiobenour@gmail.com>
Date: Mon, 28 Dec 2020 18:33:22 -0500
Subject: Fail on stdio errors

If there is an error writing to cout, cerr, or clog, APT should return a
non-zero exit code.  This allows automated tools to reliably check for
warnings.
---
 apt-private/private-cmndline.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/apt-private/private-cmndline.cc b/apt-private/private-cmndline.cc
index 67a34a2c7..e16aa7280 100644
--- a/apt-private/private-cmndline.cc
+++ b/apt-private/private-cmndline.cc
@@ -622,7 +622,7 @@ unsigned short DispatchCommandLine(CommandLine &CmdL, std::vector<CommandLine::D
       _error->DumpErrors();
    else
       _error->DumpErrors(GlobalError::NOTICE);
-   if (returned == false)
+   if (returned == false || std::cout.bad() || std::cerr.bad() || std::clog.bad())
       return 100;
    return Errors == true ? 100 : 0;
 }
-- 
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