Re: [Qemu-devel] [PATCH 7/8] os-posix: Provide new -runasid option

[Daniel P. Berrange]

On Mon, Oct 09, 2017 at 04:05:10PM +0100, Ian Jackson wrote:
> Markus Armbruster writes ("Re: [Qemu-devel] [PATCH 7/8] os-posix: Provide new 
> -runasid option"):
> > The last thing the QEMU command line needs is more exotic options.  Are
> > you sure we need a new one here?  Can we make existing -runas serve?
> > Precedence: Coreutils[*].  Pseudo-code:
> > 
> >     if argument is a decimal number starting with '+':
> >         user ID
> >     else if argument is a valid user name:
> >         user name
> >     else if argument is a valid user ID:
> >         user ID
> >     else:
> >         error
> 
> I can do this.  So -runas <uid>.<gid> then.  I don't think it makes
> sense to try to -runas <uid> because: you wouldn't have a username
> to pass to initgroups: not calling initgroups would be a bear trap;
> and otherwise we wouldn't know what gid to use.

Just use  getpwuid() to get the "struct passwd *", then change_process_uid()
doesn't need any changes at all AFAICT.


Regards,
Daniel
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