[Bug 893786] Re: mount option can`t set permissions

[Sergii Golovatiuk]

This issue is more serious than you think. For instance, I want to
create /tmp as ephemeral. Normally, I assign 1777 permissions to /tmp to
allow users to create and delete own files/directories from /tmp. That's
very common for very large set of programs. If I set up tmp in cloud-
init definition as

 - [ ephemeral0, /tmp, auto, 'defaults,nobootwait,noatime', '0', '2' ]

it means that permission will be 0755 every time after reboot. It makes
cloud-init unusable and requires extra hacks such as creating upstart
script to fix the permission on /tmp during boot process as stated at
http://serverfault.com/questions/427626/how-to-mount-tmp-in-mnt-on-ec2

As a solution you should either implement as

mounts:
 ephemeral0: 
  - [/tmp, auto, 'defaults,nobootwait,noatime', '0', '2' ]  
  - [/tmp, "root:root, 1777]

or

[ ephemeral0, /tmp, 'defaults', '0', '2', 'ubuntu:ubuntu', '0755']

otherwise this bug makes cloud-init not very usable for mount management

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https://bugs.launchpad.net/bugs/893786

Title:
  mount option can`t set permissions

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