Re: Moving an ostree across filesystems

["Colin Walters" <walters verbum org>]

On Sat, Apr 25, 2020, at 2:28 AM, Damian Ivanov via ostree-list wrote:
> Hi,
>
> Flaptak uses ostree to deduplicate data using hard links.
> I have the directory $HOME/.local/share/flatpak which is said ostree
> (4.9GB with hard links).
> Now I want to move said directory to a different partition /mnt/storage
>
> Doing so will /mnt/storage/.local/share/flatpak being 20 GB
> as the hard links do not cross file system boundaries.
>
> Is there a way to recreate the hard links after moving filesystem boundaries?
> I tried ostree-fsck and flatpak repair.

How did you do the move?
The best way is to use `ostree pull-local` rather than rsync or cp, and from
there rerun flatpak to re-deploy apps.  But if you
just want to blindly copy all of the data, at least rsync has a `--hard-links` option
(though it's more expensive than ostree pull-local).

Probably this could be all wrapped up under a
`flatpak admin move-storage` command or something.