FUSE 3: "fusermount: unknown option 'nonempty'"

Summary

When FUSE 3 is installed, builds running integration commands fail with the error:

fusermount: unknown option 'nonempty'

Other relevant information

This issue happens on Debian where package fuse3 provides both fusermount3 and fusermount.

In FUSE 3, nonempty is always true, and has been removed. By default it is false on FUSE 2.

Note that buildbox requires FUSE 3. So we cannot have a local buildbox on the builder (unless using a container).

• BuildStream version affected: /milestone %BuildStream_v1.x

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