lib32 biarch support and libnss-extrausers

[Manik Taneja]

Loic, 
Is this for Broadcom?

Olli/Gustavo,
any thoughts on the options below?

/Manik

> On Mar 21, 2016, at 9:23 AM, Loïc Minier <loic.minier at ubuntu.com> wrote:
> 
> (BTW there's a workaround for this particular case: just add /usr/lib32 to LD_LIBRARY_PATH in your snap, and libc will find the 32-bits libnss-extrausers.)
> 
> On Mon, Mar 21, 2016 at 5:17 PM, Loïc Minier <loic.minier at ubuntu.com <mailto:loic.minier at ubuntu.com>> wrote:
> Hi,
> 
> in our images, the ubuntu user is not in the shipped /etc/passwd NSS database, but in /var/lib/extrausers/passwd. (This is to make sure that OS usernames and locally created users dont clash, e.g. if an OS update adds a system user id such as dbus or systemd and ships file owned by that system user, it should not collide with a locally created user id.)
> 
> libnss-extrausers is a libc extension and gets loaded automatically so that running "getent passwd" or doing the equivalent getpwnam libc calls returns both system users and local users, such as the ubuntu user.
> 
> However, while 32-bits programs on a 64-bits snappy system generally work fine, the ubuntu user is not returned from a 32-bits program. You can try this by running "getent passwd" with i386 getent extracted from libc-bin on a 64-bits snappy: it will list all system users but not ubuntu.
> 
> libnss-extrausers *does* ship a 32-bits version, but under the legacy /usr/lib32; I had originally filed LP #1551321 <https://bugs.launchpad.net/ubuntu/+source/libnss-extrausers/+bug/1551321> thinking this was purely a libnss-extrausers issues, but it turns out it's both  snappy and a libnss-extrausers issue. So two things:
> - I believe we should change libnss-extrausers to use multiarch pathnames instead of the legacy lib32 ones
> - do we want to support lib32 in snappy? this would be achieved with a ld.so.conf.d config provided by libc6-i386, so basically we'd just add libc6-i386 to the image
> 
> Thanks,
> - Loïc Minier
> 
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