RFC: Comfy - a CLI framework to bring the Ubuntu cloud feeling to snappy Ubuntu Core

[Steve Langasek]

On Mon, Feb 02, 2015 at 11:46:57AM +0100, Martin Pitt wrote:
> There's quite a bit more, though. For example, postinst scripts won't
> work; in other words, you can't enable sysvinit scripts or systemd
> units or get DB initialization or similar stuff;

That's true, but orthogonal to Scott's proposal; changes to the filesystem
layout don't change whether/how we run maintainer scripts on snap package
install.

> many servers won't work because they can't put their sockets into /var so
> that other stuff can see it (normally it's r/o, and if they declare a
> private overlay it will be invisible outside).

Servers are allowed to export a network socket.  Frameworks would be allowed
to export a filesystem socket to snaps depending on that framework.

>  Pretty much everything trying to write into /etc/ will not work as it's
> either r/o or doesn't work correctly due to our file bind mounts.

No; the snap would have an overlayfs in place, any writes to /etc would
happen in the snap package's overlay, not to the underlying read-only root. 
Attempts to write to the handful of bind-mounted files might fail depending
on the write mechanism, that much is true.

-- 
Steve Langasek                   Give me a lever long enough and a Free OS
Debian Developer                   to set it on, and I can move the world.
Ubuntu Developer                                    http://www.debian.org/
slangasek at ubuntu.com                                     vorlon at debian.org
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