[OE-core] issue with file-ownership in images

[Paul Barker]

On 21 April 2014 11:35, Andreas Müller <schnitzeltony at googlemail.com> wrote:
> On Thu, Apr 17, 2014 at 7:08 PM, Andreas Müller
> <schnitzeltony at googlemail.com> wrote:
>> On Thu, Apr 17, 2014 at 1:53 PM, Andreas Müller
>> <schnitzeltony at googlemail.com> wrote:
>> OK I did a test with current git master.
>>
>> Good news:
>>
>> the sequence of running preinst-script and unpacking is correct now:
>>
>> | NOTE: Performing useradd with [--root
>> /home/a.mueller/tmp/oe-core-eglibc/work/overo-angstrom-linux-gnueabi/xfce4-tiny-image/1.0-r0/rootfs
>> --system --no-create-home --user-group --home-dir /etc/polkit-1
>> polkitd] and 10 times of retry
>> ...
>> ...
>> | Installing polkit (0.112-r0) on root.
>> | Downloading file:/home/a.mueller/tmp/oe-core-eglibc/deploy/ipk/armv7at2hf-vfp-neon/polkit_0.112-r0_armv7at2hf-vfp-neon.ipk.
>> ...
>>
>> Bad news:
>>
>> gid/uid are still identical to those with opkg 2.01 (based on same ipks created)
>>
>> I think what happens is that opkg simply uses the ids which were found
>> during installation.
>>
>> So now with the sequence looking solved, I understand better what you suggested:
>>> It would certainly be possible to add options to the
>>> next version of opkg to lookup uids & gids from a given passwd & group
>>> file (which could be those from the sysroot). Is that something that
>>> would be useful in the future?
>> Yes this would solve this issue (nit: replace 'sysroot' by rootfs or image).
> I think it would be better to translate user/group names to IDs
> generally and error out if that fails. As seen with polkit: using IDs
> used during install/packing as fallback causes strange effects - or in
> other words: If environment where a package is installed has not
> prepared the required users/groups, something is wrong and the package
> will not work as expected.

Equally, non-OpenEmbedded users of opkg might want to use the
uids/gids in packages without modification. I think the solution for
opkg is to make things more configurable. I'll open an enhancement
issue to that effect on the opkg bug tracker. Unsure how soon it will
get solved as I'm very busy at the minute but I can at least write it
down so it doesn't get forgotten.

>
> Andreas

Thanks,

-- 
Paul Barker

Email: paul at paulbarker.me.uk
http://www.paulbarker.me.uk