def translate_host_platform(
platform_constraint: PlatformConstraint,
binary_util: BinaryUtil,
) -> HostPlatform:
# This method attempts to provide a uname function to BinaryUtil.host_platform() so that the
# download urls can be calculated. For platforms that are different than the current host, we try
# to "spoof" the most appropriate value.
if Platform.current == Platform.darwin:
darwin_uname: Any = os.uname
linux_uname: Any = lambda: ("linux", None, None, None, "x86_64")
else:
assert Platform.current == Platform.linux
darwin_uname = lambda: (
"darwin",
None,
get_closest_mac_host_platform_pair(),
None,
"x86_64",
)
linux_uname = os.uname
return cast(
HostPlatform,
match(
platform_constraint,
{
PlatformConstraint.none:
lambda: HostPlatform.empty,
PlatformConstraint.darwin:
lambda: binary_util.host_platform(uname=darwin_uname()),
PlatformConstraint.linux:
lambda: binary_util.host_platform(uname=linux_uname()),
},
)(),
)
