Python snap - snap not building

[ogra]

@lapisdecor

Now, I’m having trouble with multiprocessing

You might either need to use the shared-memory interface:

https://snapcraft.io/blog/private-shared-memory-support-for-snaps

Or you could use snapcraft-preload:

Python multiprocessing sem_open blocked in strict mode

I’m trying to snap an app that uses Python’s multiprocessing module but it’s getting blocked by AppArmour when accessing /dev/shm/<randomName>. I traced the problem to the SemLock implementation in multiprocessing, specifically sem_open call, and changed the name format so that it creates a semaphore at /dev/shm/sem.snap.<snapName>.<randomName> since that path is allowed in the AppArmour profile. But that didn’t work. I then ran strace on the app and saw that sem_open() first issues an open() a…