[MESOS-9023] Move the special filesystem mount from the launch helper to isolators.

• Type: Task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: containerization
• Labels: containerizer filesystem
• Epic Link: Unified Container
• Assignee: Unassigned
• Reporter: Gilbert Song
• Created: 23/Jun/18 00:03
• Updated: 23/Jun/18 00:03

Description

Now all special filesystem mount happened in prepareChroot(), which is right before changing the root filesystem. This is too late for some case. E.g., adding more special mounts for command task which is mounting to those special fs that may overwrite some bind mounts.

Instead, we should dedicate these special mounts to corresponding isolators, e.g., linux filesystem isolator, cgroup isolator.