Flatpak-build filesystem access doesn't seem to work

1

I’m trying to build a flatpak package with flatpak-builder. During the build process, cmake wants to create several files under /usr/local/share. I’ve tried adding the following section to my build file:

    build-options:
      build-args:
        - "--filesystem=/usr/local:create"

Flatpak-builder doesn’t complain about these lines, but I still get complaints from cmake about not being able to create files under /usr/local. Does anybody have a working example that does something similar?

2

I think I might have answered my own question. It looks like “/usr” here is really part of the flatpak runtime, not the host’s /usr. I was able to tell cmake to write things into /opt instead, and I found that /opt access is allowed by --filesystem=host:create. Things seem to be working now (at least as far as that problem goes).

3

the proper solution is to fix the build system (or maybe it’s called incorrectly). This is not valid.