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3ebf371fc2
The pressure-vessel container tool in Steam will want to use this, to replace /usr with a Steam Runtime container supplied by the Steam CDN, instead of using the same Flatpak runtime that is used to run the Steam client and non-containerized games. If a custom /usr is used, the "official" Flatpak runtime is still the one reflected in the metadata. It is also mounted at /run/parent, with all its extensions, so that pressure-vessel has the option of using its graphics drivers (by populating the custom /usr with symlinks into /run/parent and/or /run/host). When doing this, we need to put an empty directory on /app, because the real /app expects to be run on top of the real runtime. It would also be reasonable to substitute a custom replacement for /app, so I've included support for that too. Partially addresses #3797. Signed-off-by: Simon McVittie <smcv@collabora.com>