Jie Yu created MESOS-4291:
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Summary: fs::enter(rootfs) does not work if 'rootfs' is read only.
Key: MESOS-4291
URL: https://issues.apache.org/jira/browse/MESOS-4291
Project: Mesos
Issue Type: Bug
Reporter: Jie Yu
I noticed this when I was testing the unified containerizer with the bind mount
backend and no volumes.
The current implementation of fs::enter will put the old root under
/tmp/._old_root_.XXXXXX in the new rootfs. It assumes that /tmp is writable in
the new rootfs, but this might not be true, especially if the bind mount
backend is used.
To solve the problem, what we can do is to mount tmpfs to /tmp in the new
rootfs and umount it after pivot_root.
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