From 75400a2a413c082de2ba5fc2f1da9dc86fd1d924 Mon Sep 17 00:00:00 2001
From: Jeff Garzik <jgarzik@bitpay.com>
Date: Sun, 24 Aug 2014 01:18:24 -0400
Subject: [PATCH] contrib/linearize: Guarantee that output is generated
 in-order

This was typically ensured implicitly by virtue of normal bitcoind
operation.  Adding an explicit check provides a stronger guarantee, and
it is cheap to add.
---
 contrib/linearize/linearize-data.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/contrib/linearize/linearize-data.py b/contrib/linearize/linearize-data.py
index ea94f25faee..2d57d245f65 100755
--- a/contrib/linearize/linearize-data.py
+++ b/contrib/linearize/linearize-data.py
@@ -125,6 +125,12 @@ def copydata(settings, blkindex, blkset):
 			print("Skipping unknown block " + hash_str)
 			continue
 
+		if blkindex[blkCount] != hash_str:
+			print("Out of order block.")
+			print("Expected " + blkindex[blkCount])
+			print("Got " + hash_str)
+			sys.exit(1)
+
 		if not fileOutput and ((outsz + inLen) > maxOutSz):
 			outF.close()
 			outF = None