For Namespaces the parent uses e.g.
jails/195178-46f603be/tmp/cool-82ChWNp1XiISVSpV/
to pass files to what is normally the child's (hidden) bind mount of that as
jails/195178-46f603be/82ChWNp1XiISVSpV/tmp
If BindMounting fails and we fallback to linking, then symlink
jails/195178-46f603be/tmp/cool-82ChWNp1XiISVSpV/ to the fallback
jails/195178-46f603be/82ChWNp1XiISVSpV/tmp so the parent can still
use the path expected for Namespaces.
So we can still get the goodness of namespaces wrt capabilities even
if we have the ills of bind-mounting fail.
Signed-off-by: Caolán McNamara <caolan.mcnamara@collabora.com>
Change-Id: I9a6f9e8db8f6edced18fe20367afc4d599a29ed2
b65ded3f6b