Source code for pylorax.mount

# mount.py
#
# Copyright (C) 2011-2015  Red Hat, Inc.
#
# 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 General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): Brian C. Lane <bcl@redhat.com>
#
import logging
log = logging.getLogger("livemedia-creator")

import os
import pycdlib
from pycdlib.pycdlibexception import PyCdlibException

from pylorax.imgutils import mount, umount

[docs]class IsoMountpoint(object): """ Mount the iso and check to make sure the vmlinuz and initrd.img files exist Also check the iso for a a stage2 image and set a flag and extract the iso's label. stage2 can be either LiveOS/squashfs.img or images/install.img """ def __init__(self, iso_path, initrd_path=None): """ Mount the iso :param str iso_path: Path to the iso to mount :param str initrd_path: Optional path to initrd initrd_path can be used to point to a tree with a newer initrd.img than the iso has. The iso is still used for stage2. self.kernel and self.initrd point to the kernel and initrd. self.stage2 is set to True if there is a stage2 image. self.repo is the path to the mounted iso if there is a /repodata dir. """ self.label = None self.iso_path = iso_path self.initrd_path = initrd_path if not self.initrd_path: self.mount_dir = mount(self.iso_path, opts="loop") else: self.mount_dir = self.initrd_path kernel_list = [("/isolinux/vmlinuz", "/isolinux/initrd.img"), ("/ppc/ppc64/vmlinuz", "/ppc/ppc64/initrd.img"), ("/images/pxeboot/vmlinuz", "/images/pxeboot/initrd.img")] if os.path.isdir(self.mount_dir+"/repodata"): self.repo = self.mount_dir else: self.repo = None self.stage2 = os.path.exists(self.mount_dir+"/LiveOS/squashfs.img") or \ os.path.exists(self.mount_dir+"/images/install.img") try: for kernel, initrd in kernel_list: if (os.path.isfile(self.mount_dir+kernel) and os.path.isfile(self.mount_dir+initrd)): self.kernel = self.mount_dir+kernel self.initrd = self.mount_dir+initrd break else: raise Exception("Missing kernel and initrd file in iso, failed" " to search under: {0}".format(kernel_list)) except: self.umount() raise self.get_iso_label()
[docs] def umount( self ): """Unmount the iso""" if not self.initrd_path: umount(self.mount_dir)
[docs] def get_iso_label(self): """ Get the iso's label using pycdlib Sets self.label if one is found """ try: iso = pycdlib.PyCdlib() iso.open(self.iso_path) self.label = iso.pvd.volume_identifier.decode("UTF-8").strip() except PyCdlibException as e: log.error("Problem reading label from %s: %s", self.iso_path, e)