#
# image.py: Support methods for CD/DVD and ISO image installations.
#
# Copyright (C) 2007 Red Hat, Inc. All rights reserved.
#
# 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/>.
#
from pyanaconda import isys
import os, os.path, stat, tempfile
from pyanaconda.constants import ISO_DIR
from pyanaconda.errors import errorHandler, ERROR_RAISE, InvalidImageSizeError, MediaMountError, MediaUnmountError, MissingImageError
import blivet.util
import blivet.arch
from blivet.errors import FSError, StorageError
import logging
log = logging.getLogger("anaconda")
_arch = blivet.arch.getArch()
def findFirstIsoImage(path):
"""
Find the first iso image in path
This also supports specifying a specific .iso image
Returns the basename of the image
"""
try:
os.stat(path)
except OSError:
return None
arch = _arch
if os.path.isfile(path) and path.endswith(".iso"):
files = [os.path.basename(path)]
path = os.path.dirname(path)
else:
files = os.listdir(path)
for fn in files:
what = path + '/' + fn
log.debug("Checking %s", what)
if not isys.isIsoImage(what):
continue
log.debug("mounting %s on /mnt/install/cdimage", what)
try:
blivet.util.mount(what, "/mnt/install/cdimage", fstype="iso9660", options="ro")
except OSError:
continue
if not os.access("/mnt/install/cdimage/.discinfo", os.R_OK):
blivet.util.umount("/mnt/install/cdimage")
continue
log.debug("Reading .discinfo")
f = open("/mnt/install/cdimage/.discinfo")
f.readline() # skip timestamp
f.readline() # skip release description
discArch = f.readline().strip() # read architecture
f.close()
log.debug("discArch = %s", discArch)
if discArch != arch:
log.warning("findFirstIsoImage: architectures mismatch: %s, %s",
discArch, arch)
blivet.util.umount("/mnt/install/cdimage")
continue
# If there's no repodata, there's no point in trying to
# install from it.
if not os.access("/mnt/install/cdimage/repodata", os.R_OK):
log.warning("%s doesn't have repodata, skipping", what)
blivet.util.umount("/mnt/install/cdimage")
continue
# warn user if images appears to be wrong size
if os.stat(what)[stat.ST_SIZE] % 2048:
log.warning("%s appears to be corrupted", what)
exn = InvalidImageSizeError("size is not a multiple of 2048 bytes")
if errorHandler.cb(exn) == ERROR_RAISE:
raise exn
log.info("Found disc at %s", fn)
blivet.util.umount("/mnt/install/cdimage")
return fn
return None
def getMediaId(path):
if os.access("%s/.discinfo" % path, os.R_OK):
f = open("%s/.discinfo" % path)
newStamp = f.readline().strip()
f.close()
return newStamp
else:
return None
# This mounts the directory containing the iso images on ISO_DIR.
def mountImageDirectory(method, storage):
# No need to mount it again.
if os.path.ismount(ISO_DIR):
return
if method.method == "harddrive":
if method.biospart:
log.warning("biospart support is not implemented")
devspec = method.biospart
else:
devspec = method.partition
# FIXME: teach DeviceTree.resolveDevice about biospart
device = storage.devicetree.resolveDevice(devspec)
while True:
try:
device.setup()
device.format.setup(mountpoint=ISO_DIR)
except StorageError as e:
log.error("couldn't mount ISO source directory: %s", e)
exn = MediaMountError(str(e))
if errorHandler.cb(exn) == ERROR_RAISE:
raise exn
elif method.method.startswith("nfsiso:"):
# XXX what if we mount it on ISO_DIR and then create a symlink
# if there are no isos instead of the remount?
# mount the specified directory
path = method.dir
if method.dir.endswith(".iso"):
path = os.path.dirname(method.dir)
url = "%s:%s" % (method.server, path)
while True:
try:
blivet.util.mount(url, ISO_DIR, fstype="nfs", options=method.options)
except OSError as e:
log.error("couldn't mount ISO source directory: %s", e)
exn = MediaMountError(str(e))
if errorHandler.cb(exn) == ERROR_RAISE:
raise exn
def mountImage(isodir, tree):
while True:
if os.path.isfile(isodir):
image = isodir
else:
image = findFirstIsoImage(isodir)
if image is None:
exn = MissingImageError()
if errorHandler.cb(exn) == ERROR_RAISE:
raise exn
else:
continue
image = os.path.normpath("%s/%s" % (isodir, image))
try:
blivet.util.mount(image, tree, fstype = 'iso9660', options="ro")
except OSError:
exn = MissingImageError()
if errorHandler.cb(exn) == ERROR_RAISE:
raise exn
else:
continue
else:
break
# Return the first Device instance containing valid optical install media
# for this product.
def opticalInstallMedia(devicetree):
retval = None
# Search for devices identified as cdrom along with any other
# device that has an iso9660 filesystem. This will catch USB media
# created from ISO images.
for dev in set(devicetree.getDevicesByType("cdrom") + \
[d for d in devicetree.devices if d.format.type == "iso9660"]):
if not dev.controllable:
continue
devicetree.updateDeviceFormat(dev)
if not hasattr(dev.format, "mount"):
# no mountable media
continue
mountpoint = tempfile.mkdtemp()
try:
try:
dev.format.mount(mountpoint=mountpoint)
except FSError:
continue
if not verifyMedia(mountpoint):
dev.format.unmount()
continue
dev.format.unmount()
finally:
os.rmdir(mountpoint)
retval = dev
break
return retval
# Return a list of Device instances that may have HDISO install media
# somewhere. Candidate devices are simply any that we can mount.
def potentialHdisoSources(devicetree):
return filter(lambda d: d.format.exists and d.format.mountable, devicetree.getDevicesByType("partition"))
def umountImage(tree):
if os.path.ismount(tree):
blivet.util.umount(tree)
def unmountCD(dev):
if not dev:
return
while True:
try:
dev.format.unmount()
except FSError as e:
log.error("exception in _unmountCD: %s", e)
exn = MediaUnmountError()
errorHandler.cb(exn, dev)
else:
break
def verifyMedia(tree, timestamp=None):
if os.access("%s/.discinfo" % tree, os.R_OK):
f = open("%s/.discinfo" % tree)
newStamp = f.readline().strip()
# Next is the description, which we just want to throw away.
f.readline()
arch = f.readline().strip()
f.close()
if timestamp is not None:
if newStamp == timestamp and arch == _arch:
return True
else:
if arch == _arch:
return True
return False