#!/usr/bin/env python
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import os
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import re
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import tempfile
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import shutil
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import sys
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import subprocess
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import zipfile
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PYTHON_BINARY = '%interpreter%'
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MAIN_FILE = '%main%'
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PYTHON_PATH = 'PYTHONPATH'
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# Don't imply 'import site' on initialization
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PYTHON_ARG = '-S'
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def SearchPathEnv(name):
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search_path = os.getenv('PATH', os.defpath).split(os.pathsep)
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for directory in search_path:
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if directory == '': continue
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path = os.path.join(directory, name)
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# Check if path is actual executable file.
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if os.path.isfile(path) and os.access(path, os.X_OK):
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return path
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return None
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def FindPythonBinary():
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if PYTHON_BINARY.startswith('/'):
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# Case 1: Python interpreter is directly provided with absolute path.
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return PYTHON_BINARY
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else:
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# Case 2: Find Python interpreter through environment variable: PATH.
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return SearchPathEnv(PYTHON_BINARY)
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# Create the runfiles tree by extracting the zip file
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def ExtractRunfiles():
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temp_dir = tempfile.mkdtemp("", "Soong.python_")
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zf = zipfile.ZipFile(os.path.dirname(__file__))
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zf.extractall(temp_dir)
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return temp_dir
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def Main():
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args = sys.argv[1:]
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new_env = {}
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runfiles_path = None
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try:
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runfiles_path = ExtractRunfiles()
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# Add runfiles path to PYTHONPATH.
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python_path_entries = [runfiles_path]
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# Add top dirs within runfiles path to PYTHONPATH.
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top_entries = [os.path.join(runfiles_path, i) for i in os.listdir(runfiles_path)]
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top_pkg_dirs = [i for i in top_entries if os.path.isdir(i)]
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python_path_entries += top_pkg_dirs
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old_python_path = os.environ.get(PYTHON_PATH)
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separator = ':'
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new_python_path = separator.join(python_path_entries)
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# Copy old PYTHONPATH.
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if old_python_path:
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new_python_path += separator + old_python_path
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new_env[PYTHON_PATH] = new_python_path
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# Now look for main python source file.
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main_filepath = os.path.join(runfiles_path, MAIN_FILE)
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assert os.path.exists(main_filepath), \
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'Cannot exec() %r: file not found.' % main_filepath
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assert os.access(main_filepath, os.R_OK), \
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'Cannot exec() %r: file not readable.' % main_filepath
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python_program = FindPythonBinary()
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if python_program is None:
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raise AssertionError('Could not find python binary: ' + PYTHON_BINARY)
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args = [python_program, PYTHON_ARG, main_filepath] + args
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os.environ.update(new_env)
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sys.stdout.flush()
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retCode = subprocess.call(args)
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exit(retCode)
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except:
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raise
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finally:
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if runfiles_path is not None:
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shutil.rmtree(runfiles_path, True)
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if __name__ == '__main__':
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Main()
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