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import sys
import subprocess
import py
from subprocess import Popen, PIPE
def cmdexec(cmd):
""" return unicode output of executing 'cmd' in a separate process.
raise cmdexec.Error exeception if the command failed.
the exception will provide an 'err' attribute containing
the error-output from the command.
if the subprocess module does not provide a proper encoding/unicode strings
sys.getdefaultencoding() will be used, if that does not exist, 'UTF-8'.
"""
process = subprocess.Popen(cmd, shell=True,
universal_newlines=True,
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = process.communicate()
if sys.version_info[0] < 3: # on py3 we get unicode strings, on py2 not
try:
default_encoding = sys.getdefaultencoding() # jython may not have it
except AttributeError:
default_encoding = sys.stdout.encoding or 'UTF-8'
out = unicode(out, process.stdout.encoding or default_encoding)
err = unicode(err, process.stderr.encoding or default_encoding)
status = process.poll()
if status:
raise ExecutionFailed(status, status, cmd, out, err)
return out
class ExecutionFailed(py.error.Error):
def __init__(self, status, systemstatus, cmd, out, err):
Exception.__init__(self)
self.status = status
self.systemstatus = systemstatus
self.cmd = cmd
self.err = err
self.out = out
def __str__(self):
return "ExecutionFailed: %d %s\n%s" %(self.status, self.cmd, self.err)
# export the exception under the name 'py.process.cmdexec.Error'
cmdexec.Error = ExecutionFailed
try:
ExecutionFailed.__module__ = 'py.process.cmdexec'
ExecutionFailed.__name__ = 'Error'
except (AttributeError, TypeError):
pass
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