Hello I created a vfs package archive containing vfs and vfs_cow and start it within the sculpt runtime providing the following configuration:
<config>
<vfs>
<dir name="immutable"> <fs label="template_data"/> </dir>
<dir name="mutable"> <fs label="user_data"/> </dir>
<dir name="cow">
<cow ro="/immutable" rw="/mutable"/>
</dir>
</vfs>
<default-policy root="/cow" writeable="yes"/>
</config>
Then, I changed the "target" file system of the noux package to use the
above copy-on-write file system to play around with it...
First thing I noticed is that the directories and files of
"template_data" are not populated. I guess that's a feature that is not
yet or will not be implemented and for my use case it doesn't bother me
right now.
But when I open/write a file (that exists in template_data), cow_vfs
writes the following output:
[runtime -> cow_fs] Warning: COW: block for replication...
[runtime -> cow_fs] Warning: COW: block for replication...
...and never unblocks afterwards. If immutable is something like </ram>
or </inline ...>, it works as I would expect it. Is this a known
limitation? Or can someone point me to the right direction to solve it?
I love the idea of the vfs_cow component and I guess it may cover many
other use cases!
Cheers, Roman
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