On Tue, Oct 14, 2014 at 07:23:52AM +0100, Paul Barker wrote: > On 13 October 2014 10:13, Paul Eggleton <paul.eggle...@linux.intel.com> wrote: > > On Sunday 12 October 2014 16:05:41 Peter A. Bigot wrote: > >> Pilot error. This ultimately turned out to be a side-effect of the way > >> I create my image media: I unpacking the rootfs tar file onto a mounted > >> sdcard outside the pseudo environment and forgot that tar records > >> user/group by name not uid/gid. > > > > I used to use this method previously, and I guess it can still work if > > you're > > not including certain packages in your image - but I wonder if we should > > note > > this potential pitfall somewhere in the documentation. I'm not entirely sure > > where such a note would go, though. > > > > It probably does need noting somewhere - I've been doing exactly this > for the last year or so and never even thought that I might be risking > bad uid/gid values. It makes sense now I think about it but it never > crossed my mind. > > Looking at 'man tar', there is a '--numeric-owner' option to always > use numbers for user/group names. It might just be that we need to > recommend using this option when untarring a rootfs onto a mounted > volume. This option is present in GNU tar, I'm not sure about other > implementations, and I haven't given it a proper test, but it looks > like the thing we want.
It's not supported in busybox's tar implementation at least wasn't with default config last time I've checked couple years ago - we're using it since then without any issues. -- Martin 'JaMa' Jansa jabber: martin.ja...@gmail.com
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