110 lines
3.8 KiB
Python
110 lines
3.8 KiB
Python
# mount.py
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#
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# Copyright (C) 2011-2015 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Author(s): Brian C. Lane <bcl@redhat.com>
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#
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import logging
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log = logging.getLogger("livemedia-creator")
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import os
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import iso9660
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from pylorax.imgutils import mount, umount
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class IsoMountpoint(object):
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"""
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Mount the iso and check to make sure the vmlinuz and initrd.img files exist
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Also check the iso for a a stage2 image and set a flag and extract the
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iso's label.
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stage2 can be either LiveOS/squashfs.img or images/install.img
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"""
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def __init__(self, iso_path, initrd_path=None):
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"""
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Mount the iso
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:param str iso_path: Path to the iso to mount
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:param str initrd_path: Optional path to initrd
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initrd_path can be used to point to a tree with a newer
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initrd.img than the iso has. The iso is still used for stage2.
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self.kernel and self.initrd point to the kernel and initrd.
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self.stage2 is set to True if there is a stage2 image.
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self.repo is the path to the mounted iso if there is a /repodata dir.
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"""
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self.label = None
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self.iso_path = iso_path
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self.initrd_path = initrd_path
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if not self.initrd_path:
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self.mount_dir = mount(self.iso_path, opts="loop")
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else:
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self.mount_dir = self.initrd_path
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kernel_list = [("/isolinux/vmlinuz", "/isolinux/initrd.img"),
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("/ppc/ppc64/vmlinuz", "/ppc/ppc64/initrd.img"),
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("/images/pxeboot/vmlinuz", "/images/pxeboot/initrd.img"),
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("/images/kernel.img", "/images/initrd.img")]
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if os.path.isdir(self.mount_dir+"/repodata"):
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self.repo = self.mount_dir
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else:
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self.repo = None
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self.stage2 = os.path.exists(self.mount_dir+"/LiveOS/squashfs.img") or \
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os.path.exists(self.mount_dir+"/images/install.img")
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try:
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for kernel, initrd in kernel_list:
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if (os.path.isfile(self.mount_dir+kernel) and
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os.path.isfile(self.mount_dir+initrd)):
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self.kernel = self.mount_dir+kernel
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self.initrd = self.mount_dir+initrd
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break
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else:
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raise Exception("Missing kernel and initrd file in iso, failed"
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" to search under: {0}".format(kernel_list))
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except:
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self.umount()
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raise
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self.get_iso_label()
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def umount( self ):
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"""Unmount the iso"""
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if not self.initrd_path:
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umount(self.mount_dir)
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def get_iso_label(self):
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"""
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Get the iso's label using pycdio
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Sets self.label if one is found
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"""
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try:
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iso = iso9660.ISO9660.IFS(source=self.iso_path)
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if not iso.is_open():
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raise RuntimeError("error opening file")
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self.label = iso.get_volume_id()
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if self.label is None:
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self.label = ""
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raise RuntimeError("error reading volume id")
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except RuntimeError as e:
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log.error("Problem reading label from %s: %s", self.iso_path, e)
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