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