| """A Jupyter-aware wrapper for the yarn package manager""" | |
| import os | |
| # Copyright (c) Jupyter Development Team. | |
| # Distributed under the terms of the Modified BSD License. | |
| import sys | |
| from jupyterlab_server.process import subprocess, which | |
| HERE = os.path.dirname(os.path.abspath(__file__)) | |
| YARN_PATH = os.path.join(HERE, "staging", "yarn.js") | |
| def execvp(cmd, argv): | |
| """Execvp, except on Windows where it uses Popen. | |
| The first argument, by convention, should point to the filename | |
| associated with the file being executed. | |
| Python provides execvp on Windows, but its behavior is problematic | |
| (Python bug#9148). | |
| """ | |
| cmd = which(cmd) | |
| if os.name == "nt": | |
| import signal | |
| import sys | |
| p = subprocess.Popen([cmd] + argv[1:]) | |
| # Don't raise KeyboardInterrupt in the parent process. | |
| # Set this after spawning, to avoid subprocess inheriting handler. | |
| signal.signal(signal.SIGINT, signal.SIG_IGN) | |
| p.wait() | |
| sys.exit(p.returncode) | |
| else: | |
| os.execvp(cmd, argv) # noqa S606 | |
| def main(argv=None): | |
| """Run node and return the result.""" | |
| # Make sure node is available. | |
| argv = argv or sys.argv[1:] | |
| execvp("node", ["node", YARN_PATH, *argv]) | |