Sandbox issues with Swift Package Manager

[Andrew Udvare]

I am testing out how to build Xcode-based packages that use Swift 
Package Manager (SPM) and it seems even with 'hacks' to make Xcode not 
do any downloading of code, there's still some network activity (or 
something the sandbox is blocking) that I have not figured out.

Example port: https://github.com/Tatsh/ports/tree/master/aqua/eul

Try using this with `port -d destroot` to see everything. You will get 
this error:

Resolve Package Graph

sandbox-exec: sandbox_apply: Operation not permitted

sandbox-exec: sandbox_apply: Operation not permitted

sandbox-exec: sandbox_apply: Operation not permitted

sandbox-exec: sandbox_apply: Operation not permitted

cannot update Package.resolved file because automatic resolution is 
disabledxcodebuild: error: Could not resolve package dependencies:
   sandbox-exec: sandbox_apply: Operation not permitted
   sandbox-exec: sandbox_apply: Operation not permitted
   sandbox-exec: sandbox_apply: Operation not permitted
   sandbox-exec: sandbox_apply: Operation not permitted
   cannot update Package.resolved file because automatic resolution is 
disabled
   fatalError

Thoughts on how this can be worked around? If anyone figures out what 
these blocked operations were I'd be very interested in knowing.

Thanks
Andrew
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