Merge pull request #37 from plotly/0_9_3p

Save original sources.list before overriding and restore it at the end.

internal-functions

@@ -71,6 +71,7 @@ if [ -d $DIR/apt-preferences ]; then
 fi
 if [ -f $DIR/apt-sources-list ]; then
     echo "-----> Using customized sources.list"
+    mv -v /etc/apt/sources.list /etc/apt/sources.list.orig
     mv -v $DIR/apt-sources-list /etc/apt/sources.list
 fi
 if [ -f $DIR/apt-repositories ]; then
@@ -104,6 +105,12 @@ if [ -d $DIR/dpkg-packages ]; then
     echo "-----> Injecting packages: \$PACKAGES"
     dpkg -i \$PACKAGES
 fi
+
+if [ -f /etc/apt/sources.list.orig ]; then
+    echo "-----> Restoring original sources.list"
+    mv -v /etc/apt/sources.list.orig /etc/apt/sources.list
+fi
+
 rm -rf /tmp/apt
 sleep 1 # wait so that docker run has not exited before docker attach
 EOF