build snap for armhf on amd64

• Version: 20.44.1

• Target: armv7l

Thanks for that last fix! I tried building the snap for armv7l with the newest update and now it just hangs. I’m trying to build the snap on my amd64 ubuntu machine – so I’m not sure if cross compilation is working yet?

I’m running this command: build --linux --armv7l snap

Which results in it hanging here:

[develar]

Works for me. I will release template (so, you can build your app on any OS) tomorrow.

[ZaneL]

I’ve returned with some info on how to build snaps for armhf (raspberry pi) + arm64. I assume things will change in the near future to make this easier, but at the moment there are two problems:

1.) Cross compilation is only kinda-sorta working in snapcraft at the moment…so it doesn’t seem possible to build an armhf snap on an amd64 system without some bizarre problems – especially an electron snap.

2.) As a result of this, you need to build the snaps locally on your raspberry pi. The issue is that you can’t do this easily since multipass won’t run on ubuntu server, ubuntu mate (or any standard linux OS) since virtualization (KVM) is typically disabled for arm systems in the kernel.

Temporary solution:

One thing I’ve tried that worked is as follows:

1.) Setup your electron app with the newest version of electron-builder on your raspberry pi and attempt to build the snap. It will fail (because KVM is disabled and it can’t launch multipass), but it will spit out a folder in the dist directory that looks like __snap-arm64

2.) Install lxd

2.) cd into that __snap folder and enter the following commands (obviously these will change a bit depending on armhf/arm64 and your app name):

lxc launch ubuntu:18.04 mysnapcraft
lxc file push -r . mysnapcraft/home/ubuntu/
lxc exec mysnapcraft -- /bin/bash 
snap install snapcraft --classic
cd /home/ubuntu/__snap-arm64
snapcraft --destructive-mode
exit
lxc file pull mysnapcraft/home/ubuntu/__snap-arm64/electron-quick-start_1.0.0_arm64.snap .

You should now have the snap in your __snap-arm64 folder.

What you’ve done here is created a container, copied the electron project and snap files into the container, installed snapcraft in the container, and run snapcraft in destructive mode to build everything without using multipass. Then the last command copies the snap file that you’ve built back out of the container.

Still not working

So all of this works fine and the electron app installs and connects the various interfaces, but when running the app it throws this error:

error while loading shared libraries: libnss3.so: cannot open shared object file: No such file or directory