tree a55f35b1d7231658201759cc51079e5b3be08acf
parent 390efedcb7e17587da765b6d682077cb7fa46ee1
author Alex Deymo <deymo@google.com> 1456887354 -0800
committer Alex Deymo <deymo@google.com> 1456887354 -0800

Mount the new system as 'postinstall_file' in postinstall.

When mounting the new filesystem on /postinstall, we need to override
the file attributes from the new system (unknown to the current selinux
policies) with a consistent label that will be used only in the context
of postinstall. This patch passes an extra option to mount(2) in
Brillo and Android to achieve this.

Bug: 27177071
TEST=Deployed a postinstall script with `ls -laZ`, contents show "postinstall_file".

Change-Id: Ia43b45c92e4c4cd340a884818ac00f24a418f9e7