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7bf9787921
Configured for a max line length of 120 characters.
psf/black is very opinionated and purposely doesn't leave much room for
configuration. The output is mostly OK so that should be fine for us,
but some things worth noting:
- Manually wrapped strings will be reflowed, so by using a line length
of 120 for the sake of preserving readability for our long command
calls, it also means that some manually wrapped strings are back on
the same line and should be manually merged again.
- Code generators using string concatenation extensively look awful,
since black puts each operand on a single line. We need to refactor
these generators to use more pythonic string formatting, for which
many options are available (`%`, `format` or f-strings).
- CI checks and a pre-commit hook will be added to ensure that future
buildsystem changes are well-formatted.
(cherry picked from commit cd4e46ee65)
82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
import os
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import sys
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import json
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import uuid
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import functools
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import subprocess
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# NOTE: The multiprocessing module is not compatible with SCons due to conflict on cPickle
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if sys.version_info[0] < 3:
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JSON_SERIALIZABLE_TYPES = (bool, int, long, float, basestring)
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else:
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JSON_SERIALIZABLE_TYPES = (bool, int, float, str)
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def run_in_subprocess(builder_function):
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@functools.wraps(builder_function)
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def wrapper(target, source, env):
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# Convert SCons Node instances to absolute paths
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target = [node.srcnode().abspath for node in target]
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source = [node.srcnode().abspath for node in source]
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# Short circuit on non-Windows platforms, no need to run in subprocess
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if sys.platform not in ("win32", "cygwin"):
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return builder_function(target, source, env)
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# Identify module
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module_name = builder_function.__module__
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function_name = builder_function.__name__
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module_path = sys.modules[module_name].__file__
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if module_path.endswith(".pyc") or module_path.endswith(".pyo"):
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module_path = module_path[:-1]
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# Subprocess environment
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subprocess_env = os.environ.copy()
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subprocess_env["PYTHONPATH"] = os.pathsep.join([os.getcwd()] + sys.path)
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# Keep only JSON serializable environment items
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filtered_env = dict((key, value) for key, value in env.items() if isinstance(value, JSON_SERIALIZABLE_TYPES))
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# Save parameters
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args = (target, source, filtered_env)
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data = dict(fn=function_name, args=args)
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json_path = os.path.join(os.environ["TMP"], uuid.uuid4().hex + ".json")
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with open(json_path, "wt") as json_file:
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json.dump(data, json_file, indent=2)
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json_file_size = os.stat(json_path).st_size
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print(
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"Executing builder function in subprocess: "
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"module_path=%r, parameter_file=%r, parameter_file_size=%r, target=%r, source=%r"
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% (module_path, json_path, json_file_size, target, source)
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)
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try:
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exit_code = subprocess.call([sys.executable, module_path, json_path], env=subprocess_env)
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finally:
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try:
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os.remove(json_path)
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except (OSError, IOError) as e:
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# Do not fail the entire build if it cannot delete a temporary file
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print(
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"WARNING: Could not delete temporary file: path=%r; [%s] %s" % (json_path, e.__class__.__name__, e)
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)
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# Must succeed
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if exit_code:
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raise RuntimeError(
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"Failed to run builder function in subprocess: module_path=%r; data=%r" % (module_path, data)
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)
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return wrapper
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def subprocess_main(namespace):
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with open(sys.argv[1]) as json_file:
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data = json.load(json_file)
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fn = namespace[data["fn"]]
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fn(*data["args"])
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