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# -*- coding: utf-8 -*-
#
# File: portato/gui/updater.py
# This file is part of the Portato-Project, a graphical portage-frontend.
#
# Copyright (C) 2008 René 'Necoro' Neumann
# This is free software. You may redistribute copies of it under the terms of
# the GNU General Public License version 2.
# There is NO WARRANTY, to the extent permitted by law.
#
# Written by René 'Necoro' Neumann <necoro@necoro.net>
from __future__ import absolute_import
from ..backend import system
import threading, subprocess, time
from ..helper import _, debug, error
class Updater (object):
"""
This class is intended to check what package is currently being installed and remove this one from the queue.
@cvar SED_EXP: The sed expression to strip the package name out of the qlop call.
"""
SED_EXP = r"""
/\*/{
s/ \* //
q
}"""
def __init__ (self, queue, iterators, threadClass = threading.Thread):
"""
Constructor.
Also directly initializes the thread.
@param queue: an emerge queue instance
@type queue: EmergeQueue
@param iterators: a dictionary of iterators in the current queue
@type iterators: dict(string->Iterator)
"""
if not issubclass(threadClass, threading.Thread):
raise ValueError, "Only subclasses of threading.Thread are allowed."
self.queue = queue
self.iterators = iterators
self.threadClass = threadClass
self.stopEvent = threading.Event()
t = threadClass(name = "Queue Updater Thread", target = self.run)
t.setDaemon(True)
t.start()
def run (self):
"""
Run and run and run ...
Checks the packages until being stopped.
"""
curr = None
while not self.stopEvent.isSet():
# this = $(qlop -cCq | sed $SED_EXP)
p1 = subprocess.Popen(["qlop", "--current", "--nocolor", "--quiet"], stdout = subprocess.PIPE)
this = subprocess.Popen(["sed", self.SED_EXP], stdout = subprocess.PIPE, stdin = p1.stdout).communicate()[0]
if this: this = this.strip()
if this != curr: # changed package
curr and self.remove(self.find(curr)) # remove the previous
curr = this
time.sleep(2.0)
def stop (self):
"""
Stops the current updater.
"""
self.stopEvent.set()
def find (self, pv):
"""
As qlop only returns 'package-version' we need to assign it to a cpv.
This is done here.
"""
pkgs = system.find_packages("=%s" % pv, only_cpv = True)
if len(pkgs) > 1: # ambigous - try to find the one which is also in the iterators
for p in pkgs:
if p in self.iterators:
return p
elif not pkgs: # nothing found =|
error(_("Trying to remove package '%s' from queue which does not exist in system."), pv)
return None
else: # only one choice =)
return pkgs[0]
def remove (self, cpv):
"""
Remove a package from the queue.
"""
if cpv is None:
debug("Nothing to remove.")
return
try:
self.queue.remove_with_children(self.iterators[cpv])
except KeyError:
debug("'%s' should be removed, but is not in queue.", cpv)
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