[Dev] User ID allocation

Łukasz Stelmach l.stelmach at samsung.com
Mon May 26 10:46:33 GMT 2014

It was <2014-05-23 pią 10:16>, when Piotr Bartosiewicz wrote:
> On 22.05.2014 20:39, Thiago Macieira wrote:
>> I understand you need that. I don't understand what the problem is.
>> You should use useradd -r in the host tizen system to create a system UID for
>> you. Once you have done that, use useradd again in the container tizen but
>> pass the UID, GID, shell path, home dir settings from the host system.
> Suppose (for the purpose of this discussion) you've downloaded a containers
> image from the www. In your solution the installation process should:
> * add a user in host
> * hack the containers image:
> * - add this user with given ID (how to ensure it is not used already?)
> * - chown relevant files or install this files after user was added
> And the second example where we want the ID to be statically reserved:
> We want the root (userID=0) inside container to be mapped to the user
> ID=Z in the host. We can't afford to chown almost every file in the
> containers tizen system to the newly created user on the host - it
> takes too long. If we would know the userID while creating the
> containers image then no action would be needed while installing this
> container.

I think I understand the problem, but this looks like UID per app (or
whatever other entity) which wasn't meant to be supported in Tizen.
However, I understand you need some way to solve it. Let me try.

1. Do you need to support the container users anywhere else outsied the
container infrastructure.

yes: this is going to be tricky

no: no problem.

2 (I assume you've answered "no" above.) Create your own id allocation
code that keeps track of id in a separate db and does not modify
/etc/passwd at all. The only thing you need to take care of here is to
make useradd not to use your ids.

Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics
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