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"""execute.py -- Run executable programs.
lvc.execute wraps the standard subprocess module in for MVC.
"""
import os
import subprocess
import sys
CalledProcessError = subprocess.CalledProcessError
def default_popen_args():
retval = {
'stdin': open(os.devnull, 'rb'),
'stdout': subprocess.PIPE,
'stderr': subprocess.STDOUT,
}
if sys.platform == 'win32':
retval['startupinfo'] = subprocess.STARTUPINFO()
retval['startupinfo'].dwFlags |= subprocess.STARTF_USESHOWWINDOW
return retval
class Popen(subprocess.Popen):
"""subprocess.Popen subclass that adds MVC default behavior.
By default we:
- Use a /dev/null equivilent for stdin
- Use a pipe for stdout
- Redirect stderr to stdout
- use STARTF_USESHOWWINDOW to not open a console window on win32
These are just defaults though, they can be overriden by passing different
values to the constructor
"""
def __init__(self, commandline, **kwargs):
final_args = default_popen_args()
final_args.update(kwargs)
subprocess.Popen.__init__(self, commandline, **final_args)
def check_output(commandline, **kwargs):
"""MVC version of subprocess.check_output.
This performs the same default behavior as the Popen class.
"""
final_args = default_popen_args()
# check_output doesn't use stdout
del final_args['stdout']
final_args.update(kwargs)
return subprocess.check_output(commandline, **final_args)
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