diff options
Diffstat (limited to 'lib/spack/external/py/_process/cmdexec.py')
-rw-r--r-- | lib/spack/external/py/_process/cmdexec.py | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/spack/external/py/_process/cmdexec.py b/lib/spack/external/py/_process/cmdexec.py new file mode 100644 index 0000000000..f83a249402 --- /dev/null +++ b/lib/spack/external/py/_process/cmdexec.py @@ -0,0 +1,49 @@ +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 |