On Fri, Jun 19, 2020, at 12:44 PM, Daniel P. Berrangé wrote:

> IIUC from the docs, when using Modularity to build Flatpaks, the
> prefix is changed to /app instead of /usr, which makes it much
> closers to SCL:
> 
>    https://docs.fedoraproject.org/en-US/flatpak/concepts/

The reason for that has nothing to do with modularity, but actually a core 
distinction between flatpak and "containers" by which it's usually understood 
one is talking about Docker/OCI.  (Also the confusion gets even bigger here 
because flatpak can use Docker/OCI as a transport, but differs in the model of 
how it uses those images)

flatpak *dynamically links* applications with the runtime (in contrast to the 
Docker/OCI model).  That's why flatpak apps are in /app.

(There's nothing truly desktop/flatpak specific about doing this, but trying to 
propagate it to the wider container world around e.g. Kubernetes is a large 
complex topic)
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