#
# rescue.py - anaconda rescue mode setup
#
# Copyright (C) 2001, 2002, 2003, 2004 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 .
#
# Author(s): Mike Fulbright
# Jeremy Katz
#
import sys
import os
from pyanaconda import iutil
import shutil
import time
import re
from snack import ButtonChoiceWindow, ListboxChoiceWindow,SnackScreen
from pyanaconda.constants import ANACONDA_CLEANUP
from pyanaconda.constants_text import TEXT_OK_BUTTON, TEXT_NO_BUTTON, TEXT_YES_BUTTON
from pyanaconda.text import WaitWindow, OkCancelWindow, ProgressWindow, PassphraseEntryWindow
from pyanaconda.flags import flags
from pyanaconda.installinterfacebase import InstallInterfaceBase
from pyanaconda.i18n import _
from pyanaconda.kickstart import runPostScripts
from blivet import osinstall
from blivet.errors import StorageError
from blivet.devices import LUKSDevice
from blivet.osinstall import storageInitialize, mountExistingSystem
from pykickstart.constants import KS_REBOOT, KS_SHUTDOWN
from gi.repository import BlockDev as blockdev
import meh.ui.text
import logging
log = logging.getLogger("anaconda")
class RescueInterface(InstallInterfaceBase):
def waitWindow(self, title, text):
return WaitWindow(self.screen, title, text)
def progressWindow(self, title, text, total, updpct = 0.05, pulse = False):
return ProgressWindow(self.screen, title, text, total, updpct, pulse)
def detailedMessageWindow(self, title, text, longText=None, ty="ok",
default=None, custom_icon=None,
custom_buttons=None, expanded=False):
return self.messageWindow(title, text, ty, default, custom_icon,
custom_buttons)
def messageWindow(self, title, text, ty = "ok", default = None,
custom_icon=None, custom_buttons=None):
if custom_buttons is None:
custom_buttons = []
if ty == "ok":
ButtonChoiceWindow(self.screen, title, text, buttons=[TEXT_OK_BUTTON])
elif ty == "yesno":
if default and default == "no":
btnlist = [TEXT_NO_BUTTON, TEXT_YES_BUTTON]
else:
btnlist = [TEXT_YES_BUTTON, TEXT_NO_BUTTON]
rc = ButtonChoiceWindow(self.screen, title, text, buttons=btnlist)
if rc == "yes":
return 1
else:
return 0
elif ty == "custom":
tmpbut = []
for but in custom_buttons:
tmpbut.append(but.replace("_",""))
rc = ButtonChoiceWindow(self.screen, title, text, width=60, buttons=tmpbut)
idx = 0
for b in tmpbut:
if b.lower() == rc:
return idx
idx += 1
return 0
else:
return OkCancelWindow(self.screen, title, text)
def passphraseEntryWindow(self, device):
w = PassphraseEntryWindow(self.screen, device)
passphrase = w.run()
w.pop()
return passphrase
@property
def meh_interface(self):
return self._meh_interface
@property
def tty_num(self):
return 1
def shutdown (self):
self.screen.finish()
def suspend(self):
pass
def resume(self):
pass
def __init__(self):
InstallInterfaceBase.__init__(self)
self.screen = SnackScreen()
self._meh_interface = meh.ui.text.TextIntf()
def makeFStab(instPath = ""):
if os.access("/proc/mounts", os.R_OK):
f = open("/proc/mounts", "r")
buf = f.read()
f.close()
else:
buf = ""
try:
f = open(instPath + "/etc/fstab", "a")
if buf:
f.write(buf)
f.close()
except IOError as e:
log.info("failed to write /etc/fstab: %s", e)
# make sure they have a resolv.conf in the chroot
def makeResolvConf(instPath):
if flags.imageInstall:
return
if not os.access("/etc/resolv.conf", os.R_OK):
return
if os.access("%s/etc/resolv.conf" %(instPath,), os.R_OK):
f = open("%s/etc/resolv.conf" %(instPath,), "r")
buf = f.read()
f.close()
else:
buf = ""
# already have a nameserver line, don't worry about it
if buf.find("nameserver") != -1:
return
f = open("/etc/resolv.conf", "r")
buf = f.read()
f.close()
# no nameserver, we can't do much about it
if buf.find("nameserver") == -1:
return
shutil.copyfile("%s/etc/resolv.conf" %(instPath,),
"%s/etc/resolv.conf.bak" %(instPath,))
f = open("%s/etc/resolv.conf" %(instPath,), "w+")
f.write(buf)
f.close()
def runShell(screen = None, msg=""):
if screen:
screen.suspend()
print
if msg:
print(msg)
if flags.imageInstall:
print(_("Run %s to unmount the system when you are finished.")
% ANACONDA_CLEANUP)
else:
print(_("When finished please exit from the shell and your "
"system will reboot."))
print
proc = None
if os.path.exists("/usr/bin/firstaidkit-qs"):
iutil.execWithRedirect("/usr/bin/firstaidkit-qs", [])
if proc is None or proc.returncode!=0:
if os.path.exists("/bin/bash"):
iutil.execConsole()
else:
print(_("Unable to find /bin/sh to execute! Not starting shell"))
time.sleep(5)
if screen:
screen.finish()
def _exception_handler_wrapper(orig_except_handler, screen, *args):
"""
Helper function that wraps the exception handler with snack shutdown.
:param orig_except_handler: original exception handler that should be run
after the wrapping changes are done
:type orig_except_handler: exception handler as can be set as sys.excepthook
:param screen: snack screen that should be shut down before further actions
:type screen: snack screen
"""
screen.finish()
return orig_except_handler(*args)
def _unlock_devices(intf, storage):
try_passphrase = None
for device in storage.devices:
if device.format.type == "luks":
skip = False
unlocked = False
while not (skip or unlocked):
if try_passphrase is None:
passphrase = intf.passphraseEntryWindow(device.name)
else:
passphrase = try_passphrase
if passphrase is None:
# canceled
skip = True
else:
device.format.passphrase = passphrase
try:
device.setup()
device.format.setup()
luks_dev = LUKSDevice(device.format.mapName,
parents=[device],
exists=True)
storage.devicetree._addDevice(luks_dev)
storage.devicetree.populate()
unlocked = True
# try to use the same passhprase for other devices
try_passphrase = passphrase
except (StorageError, blockdev.CryptoError) as err:
log.error("Failed to unlock %s: %s", device.name, err)
device.teardown(recursive=True)
device.format.passphrase = None
try_passphrase = None
def doRescue(intf, rescue_mount, ksdata):
import blivet
# XXX: hook the exception handler wrapper that turns off snack first
orig_hook = sys.excepthook
sys.excepthook = lambda ty, val, tb: _exception_handler_wrapper(orig_hook,
intf.screen,
ty, val, tb)
for f in [ "services", "protocols", "group", "joe", "man.config",
"nsswitch.conf", "selinux", "mke2fs.conf" ]:
try:
os.symlink('/mnt/runtime/etc/' + f, '/etc/' + f)
except OSError:
pass
# Early shell access with no disk access attempts
if not rescue_mount:
# the %post should be responsible for mounting all needed file systems
# NOTE: 1st script must be bash or simple python as nothing else might be available in the rescue image
if flags.automatedInstall and ksdata.scripts:
runPostScripts(ksdata.scripts)
else:
runShell()
sys.exit(0)
if flags.automatedInstall:
readOnly = ksdata.rescue.romount
else:
# prompt to see if we should try and find root filesystem and mount
# everything in /etc/fstab on that root
while True:
rc = ButtonChoiceWindow(intf.screen, _("Rescue"),
_("The rescue environment will now attempt to find your "
"Linux installation and mount it under the directory "
"%s. You can then make any changes required to your "
"system. If you want to proceed with this step choose "
"'Continue'. You can also choose to mount your file systems "
"read-only instead of read-write by choosing 'Read-Only'. "
"\n\n"
"If for some reason this process fails you can choose 'Skip' "
"and this step will be skipped and you will go directly to a "
"command shell.\n\n") % (iutil.getSysroot(),),
[_("Continue"), _("Read-Only"), _("Skip")] )
if rc == _("Skip").lower():
runShell(intf.screen)
sys.exit(0)
else:
readOnly = rc == _("Read-Only").lower()
break
sto = blivet.Blivet(ksdata=ksdata)
storageInitialize(sto, ksdata, [])
_unlock_devices(intf, sto)
roots = osinstall.findExistingInstallations(sto.devicetree)
if not roots:
root = None
elif len(roots) == 1:
root = roots[0]
else:
height = min (len (roots), 12)
if height == 12:
scroll = 1
else:
scroll = 0
lst = []
for root in roots:
lst.append("%s" % root.name)
(button, choice) = \
ListboxChoiceWindow(intf.screen, _("System to Rescue"),
_("Which device holds the root partition "
"of your installation?"), lst,
[ _("OK"), _("Exit") ], width = 30,
scroll = scroll, height = height,
help = "multipleroot")
if button == _("Exit").lower():
root = None
else:
root = roots[choice]
rootmounted = False
if root:
try:
if not flags.imageInstall:
msg = _("The system will reboot automatically when you exit "
"from the shell.")
else:
msg = _("Run %s to unmount the system "
"when you are finished.") % ANACONDA_CLEANUP
mountExistingSystem(sto.fsset, root.device, readOnly=readOnly)
if flags.automatedInstall:
log.info("System has been mounted under: %s", iutil.getSysroot())
else:
ButtonChoiceWindow(intf.screen, _("Rescue"),
_("Your system has been mounted under %(rootPath)s.\n\n"
"Press to get a shell. If you would like to "
"make your system the root environment, run the command:\n\n"
"\tchroot %(rootPath)s\n\n%(msg)s") %
{'rootPath': iutil.getSysroot(),
'msg': msg},
[_("OK")] )
rootmounted = True
# now turn on swap
if not readOnly:
try:
sto.turnOnSwap()
except StorageError:
log.error("Error enabling swap")
# and selinux too
if flags.selinux:
# we have to catch the possible exception
# because we support read-only mounting
try:
fd = open("%s/.autorelabel" % iutil.getSysroot(), "w+")
fd.close()
except IOError:
log.warning("cannot touch /.autorelabel")
# set a library path to use mounted fs
libdirs = os.environ.get("LD_LIBRARY_PATH", "").split(":")
mounted = ["/mnt/sysimage%s" % mdir for mdir in libdirs]
iutil.setenv("LD_LIBRARY_PATH", ":".join(libdirs + mounted))
# find groff data dir
gversion = None
try:
glst = os.listdir("/mnt/sysimage/usr/share/groff")
except OSError:
pass
else:
# find a directory which is a numeral, its where
# data files are
for gdir in glst:
if re.match(r'\d[.\d]+\d$', gdir):
gversion = gdir
break
if gversion is not None:
gpath = "/mnt/sysimage/usr/share/groff/"+gversion
iutil.setenv("GROFF_FONT_PATH", gpath + '/font')
iutil.setenv("GROFF_TMAC_PATH", "%s:/mnt/sysimage/usr/share/groff/site-tmac" % (gpath + '/tmac',))
# do we have bash?
try:
if os.access("/usr/bin/bash", os.R_OK):
os.symlink ("/usr/bin/bash", "/bin/bash")
except OSError:
pass
except (ValueError, LookupError, SyntaxError, NameError):
raise
except Exception as e: # pylint: disable=broad-except
log.error("doRescue caught exception: %s", e)
if flags.automatedInstall:
log.error("An error occurred trying to mount some or all of your system")
else:
if not flags.imageInstall:
msg = _("The system will reboot automatically when you "
"exit from the shell.")
else:
msg = _("Run %s to unmount the system "
"when you are finished.") % ANACONDA_CLEANUP
ButtonChoiceWindow(intf.screen, _("Rescue"),
_("An error occurred trying to mount some or all of your "
"system. Some of it may be mounted under %s.\n\n"
"Press to get a shell.") % iutil.getSysroot() + msg,
[_("OK")] )
else:
if flags.automatedInstall and ksdata.reboot.action in [KS_REBOOT, KS_SHUTDOWN]:
log.info("No Linux partitions found")
intf.screen.finish()
print(_("You don't have any Linux partitions. Rebooting.\n"))
sys.exit(0)
else:
if not flags.imageInstall:
msg = _(" The system will reboot automatically when you exit "
"from the shell.")
else:
msg = ""
ButtonChoiceWindow(intf.screen, _("Rescue Mode"),
_("You don't have any Linux partitions. Press "
"return to get a shell.%s") % msg,
[ _("OK") ], width = 50)
msgStr = ""
if rootmounted and not readOnly:
sto.makeMtab()
try:
makeResolvConf(iutil.getSysroot())
except (OSError, IOError) as e:
log.error("error making a resolv.conf: %s", e)
msgStr = _("Your system is mounted under the %s directory.") % (iutil.getSysroot(),)
ButtonChoiceWindow(intf.screen, _("Rescue"), msgStr, [_("OK")] )
# we do not need ncurses anymore, shut them down
intf.shutdown()
#create /etc/fstab in ramdisk, so it is easier to work with RO mounted filesystems
makeFStab()
# run %post if we've mounted everything
if rootmounted and not readOnly and flags.automatedInstall:
runPostScripts(ksdata.scripts)
# start shell if reboot wasn't requested
if not flags.automatedInstall or not ksdata.reboot.action in [KS_REBOOT, KS_SHUTDOWN]:
runShell(msg=msgStr)
sys.exit(0)