[PATCH 4/5] build.sh: Update apt sources

[Alexander Smirnov <asmirnov@ilbers.de>]

Trigger isar-apt packages list update before building the package to be
sure that we are in sync with the latest isar-apt content.

Signed-off-by: Alexander Smirnov <asmirnov@ilbers.de>
---
 meta/recipes-devtools/buildchroot/files/build.sh | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/meta/recipes-devtools/buildchroot/files/build.sh b/meta/recipes-devtools/buildchroot/files/build.sh
index 77e0fdd..b63a27e 100644
--- a/meta/recipes-devtools/buildchroot/files/build.sh
+++ b/meta/recipes-devtools/buildchroot/files/build.sh
@@ -3,6 +3,17 @@
 # This software is a part of ISAR.
 # Copyright (C) 2015-2017 ilbers GmbH
 
+# Make sure that we have latest isar-apt content.
+# Options meaning:
+#   Dir::Etc::sourcelist - specifies which source to be used
+#   Dir::Etc::sourceparts - disables looking for the other sources
+#   APT::Get::List-Cleanup - do not erase obsolete packages list for
+#                            upstream in '/var/lib/apt/lists'
+apt-get update \
+    -o Dir::Etc::sourcelist="sources.list.d/multistrap-isar-apt.list" \
+    -o Dir::Etc::sourceparts="-" \
+    -o APT::Get::List-Cleanup="0"
+
 # Go to build directory
 cd $1
 
-- 
2.1.4