Re: App image experiments

[Bastien Nocera <hadess hadess net>]

On Mon, 2013-02-25 at 17:18 +0100, Alexander Larsson wrote:
> Given that we don't currently have any union fs upstream the only way
> we can do this currently is to use bind mounts. So, I've written a
> small app to test this. It takes a directory with the base os and
> a set of squashfs images, then it clones to get a new namespace
> where it mounts a tmpfs. Inside it we mount loopback mount the images
> and create a directory "root" where we build up the merged structure.
>
> Any dir/file just in one of the sources gets bind-mounted in, but
> if any directory is in multiple sources we create it on the tmpfs and
> merge in the the children recursively.

Looks like overlayfs is getting merged for 3.10:
http://lwn.net/SubscriberLink/542707/4a9a00792c8b9ba5/

> Yowzers! 5000 bind mounts! But i can run gtk3-demo and it works.

This is likely going to be more efficient (and less resource intensive)
than bind-mounting 5k mounts :)

Cheers