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- import os
- import sys
- import json
- import uuid
- import functools
- import subprocess
- # NOTE: The multiprocessing module is not compatible with SCons due to conflict on cPickle
- if sys.version_info[0] < 3:
- JSON_SERIALIZABLE_TYPES = (bool, int, long, float, basestring)
- else:
- JSON_SERIALIZABLE_TYPES = (bool, int, float, str)
- def run_in_subprocess(builder_function):
- @functools.wraps(builder_function)
- def wrapper(target, source, env):
- # Convert SCons Node instances to absolute paths
- target = [node.srcnode().abspath for node in target]
- source = [node.srcnode().abspath for node in source]
- # Short circuit on non-Windows platforms, no need to run in subprocess
- if sys.platform not in ("win32", "cygwin"):
- return builder_function(target, source, env)
- # Identify module
- module_name = builder_function.__module__
- function_name = builder_function.__name__
- module_path = sys.modules[module_name].__file__
- if module_path.endswith(".pyc") or module_path.endswith(".pyo"):
- module_path = module_path[:-1]
- # Subprocess environment
- subprocess_env = os.environ.copy()
- subprocess_env["PYTHONPATH"] = os.pathsep.join([os.getcwd()] + sys.path)
- # Keep only JSON serializable environment items
- filtered_env = dict((key, value) for key, value in env.items() if isinstance(value, JSON_SERIALIZABLE_TYPES))
- # Save parameters
- args = (target, source, filtered_env)
- data = dict(fn=function_name, args=args)
- json_path = os.path.join(os.environ["TMP"], uuid.uuid4().hex + ".json")
- with open(json_path, "wt") as json_file:
- json.dump(data, json_file, indent=2)
- json_file_size = os.stat(json_path).st_size
- print(
- "Executing builder function in subprocess: "
- "module_path=%r, parameter_file=%r, parameter_file_size=%r, target=%r, source=%r"
- % (module_path, json_path, json_file_size, target, source)
- )
- try:
- exit_code = subprocess.call([sys.executable, module_path, json_path], env=subprocess_env)
- finally:
- try:
- os.remove(json_path)
- except (OSError, IOError) as e:
- # Do not fail the entire build if it cannot delete a temporary file
- print(
- "WARNING: Could not delete temporary file: path=%r; [%s] %s" % (json_path, e.__class__.__name__, e)
- )
- # Must succeed
- if exit_code:
- raise RuntimeError(
- "Failed to run builder function in subprocess: module_path=%r; data=%r" % (module_path, data)
- )
- return wrapper
- def subprocess_main(namespace):
- with open(sys.argv[1]) as json_file:
- data = json.load(json_file)
- fn = namespace[data["fn"]]
- fn(*data["args"])
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