Re: gnome-continuous: speeding up "builddisks"

[Alexander Larsson <alexl redhat com>]

On ons, 2016-08-31 at 09:37 -0400, Owen Taylor wrote:
>  
>  1) Do the ostree operations outside the container on the host
>     filesystem, then copy the entire results into the container.
>
>     The main problem with this is one of filesystem ownership: as
>     non-root, we can't create files with the ownership that will be
>     needed inside the VM. It would be possible to enhance ostree to
>     write ownership as xattrs, and then convert when copying into the
>     VM, or to even have ostree directly stream a tarfile to be
> unpacked
>     in the VM, but either would be significant work.


This is what the "bare-user" repo format does. Its writable as a
regular user, but loses no fidelity wrt things like permissions. And
yes, it does work by storing the permissions in the xattrs.

This should work well, as its the primary format that flatpak uses for
its repositories (both to support user installs, and to avoid a remote
ostree repo setuid file actually being stored setuid in the object
store).

-- 
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 Alexander Larsson                                            Red Hat, Inc 
       alexl redhat com            alexander larsson gmail com 
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