Re: OSTree and OCI images

[Alexander Larsson <alexl redhat com>]

On tor, 2016-11-10 at 13:19 -0500, Colin Walters wrote:
> On Tue, Nov 1, 2016, at 09:16 AM, Alexander Larsson wrote:
> > Yesterday I landed support in flatpak to support exporting and
> > importing flatpak apps to an OCI image spec[1] repository on disk.
> > It turns out that this code is quite unspecific to flatpak, and
> > could
> > really be useful for any kind of ostree repo.
>
> I've often debated something like this for Atomic Host.
>
> > Is there any interest in this? (Note: it does add a new json-glib
> > dependency to ostree.)
>
> I think it'd make sense to extract from flatpak for sure.  Offhand
> is there anything desktop-app specific aside from the appstream
> stuff?

Really the only flatpak specific thing is the mapping from flatpak arch
strings to golang/oci arch strings.

> We could have it be a build-time option for ostree, so people
> who are doing "fixed purpose embedded" without wanting Docker/OCI
> could just turn it off.  Or alternatively it could be a new shared
> library?
> Maybe something git-submodulable.

Yeah, I've started extracting this. The first part is ostree support
for the Docker/OCI layer format (i.e. whiteout handling and file
overriding), which has a PR here:

https://github.com/ostreedev/ostree/pull/578


After that I'll look at "export branch to OCI local dir" plus "commit
from OCI local dir" and eventually at downloading from a remote OCI
dir.

-- 
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
 Alexander Larsson                                            Red Hat, Inc 
       alexl redhat com            alexander larsson gmail com 
He's an immortal crooked sorceror with a secret. She's a hard-bitten 
gypsy safe cracker with the power to see death. They fight crime!