manager/qubesmanager/log_dialog.py

#!/usr/bin/python3
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2012  Agnieszka Kostrzewa <agnieszka.kostrzewa@gmail.com>
# Copyright (C) 2012  Marek Marczykowski <marmarek@mimuw.edu.pl>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with this program; if not, see <http://www.gnu.org/licenses/>.
#
#

from PyQt4 import QtCore  # pylint: disable=import-error
from PyQt4 import QtGui  # pylint: disable=import-error

from . import ui_logdlg   # pylint: disable=no-name-in-module
from . import clipboard
import os

# Display only this size of log
LOG_DISPLAY_SIZE = 1024*1024


class LogDialog(ui_logdlg.Ui_LogDialog, QtGui.QDialog):
    # pylint: disable=too-few-public-methods

    def __init__(self, app, log_path, parent=None):
        super(LogDialog, self).__init__(parent)

        self.app = app
        self.log_path = log_path

        self.setupUi(self)
        self.setWindowTitle(log_path)

        self.connect(self.copy_to_qubes_clipboard,
                     QtCore.SIGNAL("clicked()"),
                     self.copy_to_clipboard_triggered)

        self.__init_log_text__()

    def __init_log_text__(self):
        self.displayed_text = ""
        log = open(self.log_path)
        log.seek(0, os.SEEK_END)
        if log.tell() > LOG_DISPLAY_SIZE:
            self.displayed_text = self.tr(
                "(Showing only last %d bytes of file)\n") % LOG_DISPLAY_SIZE
            log.seek(-LOG_DISPLAY_SIZE, os.SEEK_END)
        else:
            log.seek(0, os.SEEK_SET)
        self.displayed_text += log.read()
        log.close()
        self.log_text.setPlainText(self.displayed_text)

    def copy_to_clipboard_triggered(self):
        clipboard.copy_text_to_qubes_clipboard(self.displayed_text)