From 54cc69889ed056d93e416fa76c4d6a6b0ed30ebc Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Sun, 29 Jan 2017 15:01:00 -0800
Subject: The entire concept of PendingError() is flawed :/.

---
 apt-pkg/contrib/error.cc |  9 +++++++++
 apt-pkg/contrib/error.h  | 20 ++++++++++++++++++++
 2 files changed, 29 insertions(+)

(limited to 'apt-pkg/contrib')

diff --git a/apt-pkg/contrib/error.cc b/apt-pkg/contrib/error.cc
index 3c397eaf8..143b99557 100644
--- a/apt-pkg/contrib/error.cc
+++ b/apt-pkg/contrib/error.cc
@@ -206,6 +206,15 @@ void GlobalError::Discard() {
 	PendingFlag = false;
 }
 									/*}}}*/
+// GlobalError::ReturnError - convert a stored error to a return code		/*{{{*/
+bool GlobalError::ReturnError() {
+	for (auto &message : Messages)
+		if (message.Type == ERROR)
+			message.Type = WARNING;
+	PendingFlag = false;
+	return false;
+}
+									/*}}}*/
 // GlobalError::empty - does our error list include anything?		/*{{{*/
 bool GlobalError::empty(MsgType const &threshold) const {
 	if (PendingFlag == true)
diff --git a/apt-pkg/contrib/error.h b/apt-pkg/contrib/error.h
index d0f450742..bab7a67b2 100644
--- a/apt-pkg/contrib/error.h
+++ b/apt-pkg/contrib/error.h
@@ -226,6 +226,26 @@ public:									/*{{{*/
 	 */
 	inline bool PendingError() const APT_PURE {return PendingFlag;};
 
+	/** \brief convert a stored error to a return code
+	 *
+	 *  Put simply, the entire concept of PendingError() is flawed :/.
+         *
+         *  The typical "if (PendingError()) return false;" check that is
+         *  strewn throughout the codebase "compounds", making it impossible
+         *  for there to be any nuance about the notion of "error" when a
+         *  subsystem needs to fail but a higher-level system needs to work.
+         *
+         *  However, the codebase is also horribly broken with respect to
+         *  errors, as it fails to use C++ exceptions when warranted and
+         *  instead relies on this insane indirect error mechanism to check
+         *  the failure status of a constructor. What is thereby needed is
+         *  a way to clear the PendingError() flag without also discarding
+         *  the underlying errors, so we have to convert them to warnings.
+         *
+	 *  \return \b false
+	 */
+	bool ReturnError() APT_COLD;
+
 	/** \brief is the list empty?
 	 *
 	 *  Can be used to check if the current stack level doesn't include
-- 
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