Hi, Thanks for the tip! I had some trouble with routing the components, but I managed to get it to work by explicitly adding the lx_fs component. I am attaching my runtime here for future reference.
Best,
Rumen
________________________________
From: Pirmin Duss via users <users@lists.genode.org>
Sent: Friday, July 11, 2025 7:28 AM
To: users@lists.genode.org <users@lists.genode.org>
Cc: Pirmin Duss <pirmin.d...@gapfruit.com>
Subject: Re: vfs_block Persistence
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Hello Rumen
On 7/10/25 17:41, Rumen Mitov wrote:
> My program runs successfully, however changes made to the block file
> (snapper_block.raw) do not persist. This is because I use <ram/>. But
> without <ram/> I get an error that the block file is inaccessible.
The way you configured `vfs_block`, it imports the content of the ROM in
to the RAM and allows to modify it, but the changes can't be written back.
> How can I make the block changes persist between runs? In previous
> versions of Genode I could achieve this with lx_block, but I am unsure
> how to do this with vfs_block.
I would try something as follows:
```xml
<requires>
<file_system label="lx_block"/>
</requires>
....
<start name="vfs_block" ram="1G">
<provides><service name="Block"/></provides>
<config>
<vfs>
<fs label="lx_block"/>
</vfs>
<policy label_prefix="vfs"
file="/snapper_block.raw" block_size="512" writeable="yes"/>
</config>
</start>
```
then remove the `<rom label="snapper_block.raw"/>` from `<content>`.
This should start an `lx_fs` component in the runtime. Which if I
remember correctly will serve the content of the sub directory
`lx_block`. Your needs to be in that sub-directory.
I write this from the top of my head without actually trying it out, so
there might be some steps I missed.
Regards,
Pirmin
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