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# Copyright 2007 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
import subprocess
from portage import os
from portage import _unicode_decode
from portage._sets.base import PackageSet
from portage._sets import SetConfigError
__all__ = ["CommandOutputSet"]
class CommandOutputSet(PackageSet):
"""This class creates a PackageSet from the output of a shell command.
The shell command should produce one atom per line, that is:
>>> atom1
atom2
...
atomN
Args:
name: A string that identifies the set.
command: A string or sequence identifying the command to run
(see the subprocess.Popen documentaion for the format)
"""
_operations = ["merge", "unmerge"]
def __init__(self, command):
super(CommandOutputSet, self).__init__()
self._command = command
self.description = "Package set generated from output of '%s'" % self._command
def load(self):
pipe = subprocess.Popen(self._command, stdout=subprocess.PIPE, shell=True)
stdout, stderr = pipe.communicate()
if pipe.wait() == os.EX_OK:
self._setAtoms(_unicode_decode(stdout).splitlines())
def singleBuilder(self, options, settings, trees):
if not "command" in options:
raise SetConfigError("no command specified")
return CommandOutputSet(options["command"])
singleBuilder = classmethod(singleBuilder)
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