Re: [Xenomai] [Xenomai-git] Philippe Gerum: copperplate: add configuration tunable for registry moint point

[Jan Kiszka <jan.kiszka@web.de>]

On 2015-01-02 16:06, Gilles Chanteperdrix wrote:
> To explain a bit more completely. We can not assume that xenomai
> applications are running as root user. And non root user are not
> allowed to create /run/xenomai or /var/run/xenomai (at least not on
> debian or slackware). What is more, these directories being
> typically non persistent, a script has to be modified somewhere to
> add mkdir /var/run/xenomai at every boot. On the other hand, mkdir
> /mnt/xenomai has to be done once and only once, in the "make
> install" phase for instance, since "make install" is run as root,
> except that if /mnt is read-only it will not work. But not many
> users are running system where they compile and run things with root
> filesystem read-only. Anyway, the two cases are really similar, no
> one is advantageous over the other. We are going to see questions on
> the mailing list about that, whatever we do. Perhaps adding a small
> kernel module to create /proc/xenomai/registry would make things
> simpler...
> 

Non-root users are indeed an interesting new aspect. However, the
solution to make a central directory writable seems weird to me. If you
want to allow non-root users to access the registry, it would be way
more logical to either shoot up a single privileged sysregd that
everyone can talk to or use private instances that also run against
their own per-user mount points, likely located in $HOME.

Jan

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