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- """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])
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