Re: storing overlayfs files in a different partition other than the main rootfs partition

[Colin Walters <walters verbum org>]

On Thu, Apr 19, 2018, at 9:05 AM, Davis Roman wrote:
> Hello,
>
> I'm working on an embedded device with ostree. Currently, I use 'ostree
> admin unlock --hotfix' in order to enable the overlayfs.

I try to discourage people from using `--hotfix`; down the line we should
add an easy command to add a persistent layer that applies across upgrades
too.

> However, I'm implementation a scheme with dm-verity that would require a
> read-only filesystem.

Did you see https://blog.verbum.org/2017/06/12/on-dm-verity-and-operating-systems/ ?

> Is it possible to specify an alternate location of where the store the
> overlay files other than under /  ?

The overlay data is actually underneath `/var/tmp` which doesn't have
to be the same volume as / since https://github.com/ostreedev/ostree/pull/859

But if you want to make it build or runtime configurable I'm fine with
that.