how does pants determine platform compatibility? if BUILD contains

local_environment(compatible_platforms=["linux_x86_64"])

, what is pants checking to determine if the current platform is linux_x86_64 v. macos_x86_64 v. linux_arm64 etc? I would suspect it's checking output of

uname -a

or

/etc/os-release

or something similar.

That happens here, which in turn uses

Platform.create_for_localhost()

, which eventually uses

os.uname().{machine,sysname}