# 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 iso9660
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"),
("/images/kernel.img", "/images/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 RuntimeError("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 pycdio
Sets self.label if one is found
"""
try:
iso = iso9660.ISO9660.IFS(source=self.iso_path)
if not iso.is_open():
raise RuntimeError("error opening file")
self.label = iso.get_volume_id()
if self.label is None:
self.label = ""
raise RuntimeError("error reading volume id")
except RuntimeError as e:
log.error("Problem reading label from %s: %s", self.iso_path, e)