469 lines
18 KiB
Python
469 lines
18 KiB
Python
# livepayload.py
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# Live media software payload management.
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#
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# Copyright (C) 2012 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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# Red Hat Author(s): David Lehman <dlehman@redhat.com>
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#
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"""
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TODO
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- error handling!!!
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- document all methods
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- LiveImagePayload
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- register the live image, either via self.data.method or in setup
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using storage
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"""
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import os
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import stat
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from time import sleep
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from threading import Lock
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from urlgrabber.grabber import URLGrabber
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from urlgrabber.grabber import URLGrabError
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from pyanaconda.iutil import ProxyString, ProxyStringError, lowerASCII
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import urllib
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import hashlib
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import glob
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from pyanaconda.packaging import ImagePayload, PayloadSetupError, PayloadInstallError
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from pyanaconda.constants import INSTALL_TREE, THREAD_LIVE_PROGRESS
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from pyanaconda.constants import IMAGE_DIR, TAR_SUFFIX
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from pyanaconda import iutil
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import logging
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log = logging.getLogger("packaging")
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from pyanaconda.errors import errorHandler, ERROR_RAISE
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from pyanaconda.progress import progressQ
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from blivet.size import Size
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import blivet.util
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from pyanaconda.threads import threadMgr, AnacondaThread
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from pyanaconda.i18n import _
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class LiveImagePayload(ImagePayload):
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""" A LivePayload copies the source image onto the target system. """
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def __init__(self, *args, **kwargs):
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super(LiveImagePayload, self).__init__(*args, **kwargs)
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# Used to adjust size of sysroot when files are already present
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self._adj_size = 0
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self.pct = 0
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self.pct_lock = None
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self.source_size = 1
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def setup(self, storage, instClass):
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super(LiveImagePayload, self).setup(storage, instClass)
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# Mount the live device and copy from it instead of the overlay at /
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osimg = storage.devicetree.getDeviceByPath(self.data.method.partition)
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if not stat.S_ISBLK(os.stat(osimg.path)[stat.ST_MODE]):
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exn = PayloadSetupError("%s is not a valid block device" % (self.data.method.partition,))
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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rc = blivet.util.mount(osimg.path, INSTALL_TREE, fstype="auto", options="ro")
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if rc != 0:
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raise PayloadInstallError("Failed to mount the install tree")
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source = iutil.eintr_retry_call(os.statvfs, INSTALL_TREE)
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self.source_size = source.f_frsize * (source.f_blocks - source.f_bfree)
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def unsetup(self):
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super(LiveImagePayload, self).unsetup()
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# Unmount a previously mounted live tree
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try:
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blivet.util.umount(INSTALL_TREE)
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except OSError:
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pass
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def preInstall(self, packages=None, groups=None):
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""" Perform pre-installation tasks. """
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super(LiveImagePayload, self).preInstall(packages=packages, groups=groups)
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progressQ.send_message(_("Installing software") + (" %d%%") % (0,))
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def progress(self):
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"""Monitor the amount of disk space used on the target and source and
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update the hub's progress bar.
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"""
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mountpoints = self.storage.mountpoints.copy()
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last_pct = -1
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while self.pct < 100:
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dest_size = 0
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for mnt in mountpoints:
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mnt_stat = iutil.eintr_retry_call(os.statvfs, iutil.getSysroot()+mnt)
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dest_size += mnt_stat.f_frsize * (mnt_stat.f_blocks - mnt_stat.f_bfree)
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if dest_size >= self._adj_size:
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dest_size -= self._adj_size
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pct = int(100 * dest_size / self.source_size)
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if pct != last_pct:
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with self.pct_lock:
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self.pct = pct
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last_pct = pct
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progressQ.send_message(_("Installing software") + (" %d%%") % (min(100, self.pct),))
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sleep(0.777)
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def install(self):
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""" Install the payload. """
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if self.source_size <= 0:
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raise PayloadInstallError("Nothing to install")
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self.pct_lock = Lock()
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self.pct = 0
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threadMgr.add(AnacondaThread(name=THREAD_LIVE_PROGRESS,
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target=self.progress))
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cmd = "rsync"
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# preserve: permissions, owners, groups, ACL's, xattrs, times,
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# symlinks, hardlinks
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# go recursively, include devices and special files, don't cross
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# file system boundaries
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args = ["-pogAXtlHrDx", "--exclude", "/dev/", "--exclude", "/proc/",
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"--exclude", "/sys/", "--exclude", "/run/", "--exclude", "/boot/*rescue*",
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"--exclude", "/etc/machine-id", INSTALL_TREE+"/", iutil.getSysroot()]
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try:
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rc = iutil.execWithRedirect(cmd, args)
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except (OSError, RuntimeError) as e:
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msg = None
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err = str(e)
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log.error(err)
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else:
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err = None
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msg = "%s exited with code %d" % (cmd, rc)
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log.info(msg)
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if err or rc == 12:
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exn = PayloadInstallError(err or msg)
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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# Wait for progress thread to finish
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with self.pct_lock:
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self.pct = 100
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threadMgr.wait(THREAD_LIVE_PROGRESS)
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# Live needs to create the rescue image before bootloader is written
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for kernel in self.kernelVersionList:
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log.info("Generating rescue image for %s", kernel)
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iutil.execInSysroot("new-kernel-pkg",
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["--rpmposttrans", kernel])
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def postInstall(self):
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""" Perform post-installation tasks. """
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progressQ.send_message(_("Performing post-installation setup tasks"))
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blivet.util.umount(INSTALL_TREE)
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super(LiveImagePayload, self).postInstall()
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# Make sure the new system has a machine-id, it won't boot without it
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if not os.path.exists(iutil.getSysroot()+"/etc/machine-id"):
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iutil.execInSysroot("systemd-machine-id-setup", [])
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@property
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def spaceRequired(self):
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return Size(iutil.getDirSize("/")*1024)
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class URLGrabberProgress(object):
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""" Provide methods for urlgrabber progress."""
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def start(self, filename, url, basename, size, text):
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""" Start of urlgrabber download
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:param filename: path and file that download will be saved to
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:type filename: string
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:param url: url to download from
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:type url: string
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:param basename: file that it will be saved to
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:type basename: string
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:param size: length of the file
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:type size: int
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:param text: unknown
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:type text: unknown
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"""
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self.filename = filename
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self.url = url
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self.basename = basename
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self.size = size
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self.text = text
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self._pct = -1
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def update(self, bytes_read):
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""" Download update
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:param bytes_read: Bytes read so far
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:type bytes_read: int
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"""
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if not bytes_read:
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return
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pct = min(100, int(100 * bytes_read / self.size))
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if pct == self._pct:
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return
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self._pct = pct
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progressQ.send_message(_("Downloading %(url)s (%(pct)d%%)") % \
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{"url" : self.url, "pct" : pct})
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def end(self, bytes_read):
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""" Download complete
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:param bytes_read: Bytes read so far
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:type bytes_read: int
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"""
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progressQ.send_message(_("Downloading %(url)s (%(pct)d%%)") % \
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{"url" : self.url, "pct" : 100})
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class LiveImageKSPayload(LiveImagePayload):
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""" Install using a live filesystem image from the network """
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def __init__(self, *args, **kwargs):
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super(LiveImageKSPayload, self).__init__(*args, **kwargs)
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self._min_size = 0
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self._proxies = {}
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self.image_path = iutil.getSysroot()+"/disk.img"
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@property
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def is_tarfile(self):
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""" Return True if the url ends with a tar suffix """
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return any(self.data.method.url.endswith(suffix) for suffix in TAR_SUFFIX)
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def _setup_url_image(self):
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""" Check to make sure the url is available and estimate the space
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needed to download and install it.
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"""
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self._proxies = {}
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if self.data.method.proxy:
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try:
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proxy = ProxyString(self.data.method.proxy)
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self._proxies = {"http": proxy.url,
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"https": proxy.url}
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except ProxyStringError as e:
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log.info("Failed to parse proxy for liveimg --proxy=\"%s\": %s",
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self.data.method.proxy, e)
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error = None
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try:
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req = urllib.urlopen(self.data.method.url, proxies=self._proxies)
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# At this point we know we can get the image and what its size is
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# Make a guess as to minimum size needed:
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# Enough space for image and image * 3
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if req.info().get("content-length"):
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self._min_size = int(req.info().get("content-length")) * 4
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except IOError as e:
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log.error("Error opening liveimg: %s", e)
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error = e
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else:
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# If it is a http request we need to check the code
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method = self.data.method.url.split(":", 1)[0]
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if method.startswith("http") and req.getcode() != 200:
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error = "http request returned %s" % req.getcode()
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return error
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def _setup_file_image(self):
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""" Check to make sure the file is available and estimate the space
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needed to install it.
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"""
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if not os.path.exists(self.data.method.url[7:]):
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return "file does not exist: %s" % self.data.method.url
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self._min_size = os.stat(self.data.method.url[7:])[stat.ST_SIZE] * 3
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return None
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def setup(self, storage, instClass):
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""" Check the availability and size of the image.
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"""
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# This is on purpose, we don't want to call LiveImagePayload's setup method.
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ImagePayload.setup(self, storage, instClass)
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if self.data.method.url.startswith("file://"):
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error = self._setup_file_image()
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else:
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error = self._setup_url_image()
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if error:
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exn = PayloadInstallError(str(error))
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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log.debug("liveimg size is %s", self._min_size)
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def _preInstall_url_image(self):
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""" Download the image using urlgrabber """
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# Setup urlgrabber and call back to download image to sysroot
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progress = URLGrabberProgress()
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ugopts = {"ssl_verify_peer": not self.data.method.noverifyssl,
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"ssl_verify_host": not self.data.method.noverifyssl,
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"proxies" : self._proxies,
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"progress_obj" : progress,
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"copy_local" : True}
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error = None
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try:
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ug = URLGrabber()
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ug.urlgrab(self.data.method.url, self.image_path, **ugopts)
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except URLGrabError as e:
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log.error("Error downloading liveimg: %s", e)
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error = e
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else:
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if not os.path.exists(self.image_path):
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error = "Failed to download %s, file doesn't exist" % self.data.method.url
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log.error(error)
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def unsetup(self):
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# Skip LiveImagePayload's unsetup method
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ImagePayload.unsetup(self)
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def preInstall(self, *args, **kwargs):
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""" Get image and loopback mount it.
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This is called after partitioning is setup, we now have space to
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grab the image. If it is a network source Download it to sysroot
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and provide feedback during the download (using urlgrabber
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callback).
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If it is a file:// source then use the file directly.
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"""
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error = None
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if self.data.method.url.startswith("file://"):
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self.image_path = self.data.method.url[7:]
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else:
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error = self._preInstall_url_image()
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if error:
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exn = PayloadInstallError(str(error))
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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# Used to make install progress % look correct
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self._adj_size = os.stat(self.image_path)[stat.ST_SIZE]
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if self.data.method.checksum:
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progressQ.send_message(_("Checking image checksum"))
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sha256 = hashlib.sha256()
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with open(self.image_path, "rb") as f:
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while True:
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data = f.read(1024*1024)
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if not data:
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break
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sha256.update(data)
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filesum = sha256.hexdigest()
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log.debug("sha256 of %s is %s", self.data.method.url, filesum)
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if lowerASCII(self.data.method.checksum) != filesum:
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log.error("%s does not match checksum.", self.data.method.checksum)
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exn = PayloadInstallError("Checksum of image does not match")
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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# If this looks like a tarfile, skip trying to mount it
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if not self.is_tarfile:
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# Mount the image and check to see if it is a LiveOS/*.img
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# style squashfs image. If so, move it to IMAGE_DIR and mount the real
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# root image on INSTALL_TREE
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blivet.util.mount(self.image_path, INSTALL_TREE, fstype="auto", options="ro")
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if os.path.exists(INSTALL_TREE+"/LiveOS"):
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# Find the first .img in the directory and mount that on INSTALL_TREE
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img_files = glob.glob(INSTALL_TREE+"/LiveOS/*.img")
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if img_files:
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img_file = os.path.basename(sorted(img_files)[0])
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# move the mount to IMAGE_DIR
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os.makedirs(IMAGE_DIR, 0o755)
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# work around inability to move shared filesystems
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iutil.execWithRedirect("mount",
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["--make-rprivate", "/"])
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iutil.execWithRedirect("mount",
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["--move", INSTALL_TREE, IMAGE_DIR])
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blivet.util.mount(IMAGE_DIR+"/LiveOS/"+img_file, INSTALL_TREE,
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fstype="auto", options="ro")
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source = iutil.eintr_retry_call(os.statvfs, INSTALL_TREE)
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self.source_size = source.f_frsize * (source.f_blocks - source.f_bfree)
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def install(self):
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""" Install the payload if it is a tar.
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Otherwise fall back to rsync of INSTALL_TREE
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"""
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# If it doesn't look like a tarfile use the super's install()
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if not self.is_tarfile:
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super(LiveImageKSPayload, self).install()
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return
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# Use 2x the archive's size to estimate the size of the install
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# This is used to drive the progress display
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self.source_size = os.stat(self.image_path)[stat.ST_SIZE] * 2
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self.pct_lock = Lock()
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self.pct = 0
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threadMgr.add(AnacondaThread(name=THREAD_LIVE_PROGRESS,
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target=self.progress))
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cmd = "tar"
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# preserve: ACL's, xattrs, and SELinux context
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args = ["--selinux", "--acls", "--xattrs",
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"--exclude", "/dev/", "--exclude", "/proc/",
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"--exclude", "/sys/", "--exclude", "/run/", "--exclude", "/boot/*rescue*",
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"--exclude", "/etc/machine-id", "-xaf", self.image_path, "-C", iutil.getSysroot()]
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try:
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rc = iutil.execWithRedirect(cmd, args)
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except (OSError, RuntimeError) as e:
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msg = None
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err = str(e)
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log.error(err)
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else:
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err = None
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msg = "%s exited with code %d" % (cmd, rc)
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log.info(msg)
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if err:
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exn = PayloadInstallError(err or msg)
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if errorHandler.cb(exn) == ERROR_RAISE:
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raise exn
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# Wait for progress thread to finish
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with self.pct_lock:
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self.pct = 100
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threadMgr.wait(THREAD_LIVE_PROGRESS)
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def postInstall(self):
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""" Unmount and remove image
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If file:// was used, just unmount it.
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"""
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super(LiveImageKSPayload, self).postInstall()
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if os.path.exists(IMAGE_DIR+"/LiveOS"):
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blivet.util.umount(IMAGE_DIR)
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if os.path.exists(self.image_path) and not self.data.method.url.startswith("file://"):
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os.unlink(self.image_path)
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@property
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def spaceRequired(self):
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""" We don't know the filesystem size until it is downloaded.
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Default to 1G which should be enough for a minimal image download
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and install.
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"""
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if self._min_size:
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return Size(self._min_size)
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else:
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return Size(1024*1024*1024)
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