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# -*- coding: utf-8 -*-
#################################################################################
# LAYMAN OVERLAY SOURCE BASE CLASS
#################################################################################
# File: source.py
#
# Base class for the different overlay types.
#
# Copyright:
# (c) 2010 Sebastian Pipping
# Distributed under the terms of the GNU General Public License v2
#
# Author(s):
# Sebastian Pipping <sebastian@pipping.org>
import os
from layman.overlays.overlay import Overlay
class OverlaySource(Overlay):
def __init__(self, xml, config, ignore = 0, quiet = False):
super(OverlaySource, self).__init__(xml, config, ignore, quiet)
def supported(self, binaries = []):
'''Is the overlay type supported?'''
if binaries:
for command, mtype, package in binaries:
found = False
if os.path.isabs(command):
kind = 'Binary'
found = os.path.exists(command)
else:
kind = 'Command'
for d in os.environ['PATH'].split(os.pathsep):
f = os.path.join(d, command)
if os.path.exists(f):
found = True
break
if not found:
raise Exception(kind + ' ' + command + ' seems to be missing!'
' Overlay type "' + mtype + '" not support'
'ed. Did you emerge ' + package + '?')
return True
def is_supported(self):
'''Is the overlay type supported?'''
try:
self.supported()
return True
except Exception, error:
return False
def command(self):
return self.config['%s_command' % self.__class__.type_key]
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