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|
#
# chroot.py : APIs for moblin-chroot
#
# Copyright 2009, Intel Inc.
#
# 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; version 2 of the License.
#
# 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 Library General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import os
import os.path
import sys
import time
import optparse
import logging
import shutil
import subprocess
import string
import glob
import rpm
import re
import shlex
import mic.appcreate as appcreate
import mic.imgcreate as imgcreate
import mic.imgconvert as imgconvert
def perror(msg):
print >> sys.stderr, "Error: %s" % msg
def pwarning(msg):
print "Warning: %s" % msg
def pinfo(msg):
print "Info: %s" % msg
def check_bind_mounts(chrootdir, bindmounts):
chrootmounts = []
mounts = bindmounts.split(";")
for mount in mounts:
if mount == "":
continue
srcdst = mount.split(":")
if len(srcdst) == 1:
srcdst.append("none")
if not os.path.isdir(srcdst[0]):
return False
if srcdst[1] == "" or srcdst[1] == "none":
srcdst[1] = None
if srcdst[0] in ("/proc", "/proc/sys/fs/binfmt_misc", "/", "/sys", "/dev", "/dev/pts", "/dev/shm", "/var/lib/dbus", "/var/run/dbus"):
continue
if chrootdir:
if not srcdst[1]:
srcdst[1] = os.path.abspath(os.path.expanduser(srcdst[0]))
else:
srcdst[1] = os.path.abspath(os.path.expanduser(srcdst[1]))
tmpdir = chrootdir + "/" + srcdst[1]
if os.path.isdir(tmpdir):
pwarning("dir %s has existed." % tmpdir)
return True
def cleanup_mountdir(chrootdir, bindmounts):
if bindmounts == "" or bindmounts == None:
return
chrootmounts = []
mounts = bindmounts.split(";")
for mount in mounts:
if mount == "":
continue
srcdst = mount.split(":")
if len(srcdst) == 1:
srcdst.append("none")
if srcdst[1] == "" or srcdst[1] == "none":
srcdst[1] = srcdst[0]
srcdst[1] = os.path.abspath(os.path.expanduser(srcdst[1]))
tmpdir = chrootdir + "/" + srcdst[1]
if os.path.isdir(tmpdir):
if len(os.listdir(tmpdir)) == 0:
shutil.rmtree(tmpdir, ignore_errors = True)
else:
pwarning("dir %s isn't empty." % tmpdir)
chroot_lockfd = -1
chroot_lock = ""
def setup_chrootenv(chrootdir, bindmounts = None):
global chroot_lockfd, chroot_lock
def get_bind_mounts(chrootdir, bindmounts):
chrootmounts = []
if bindmounts in ("", None):
bindmounts = ""
mounts = bindmounts.split(";")
for mount in mounts:
if mount == "":
continue
srcdst = mount.split(":")
srcdst[0] = os.path.abspath(os.path.expanduser(srcdst[0]))
if len(srcdst) == 1:
srcdst.append("none")
if not os.path.isdir(srcdst[0]):
continue
if srcdst[0] in ("/proc", "/proc/sys/fs/binfmt_misc", "/", "/sys", "/dev", "/dev/pts", "/dev/shm", "/var/lib/dbus", "/var/run/dbus"):
pwarning("%s will be mounted by default." % srcdst[0])
continue
if srcdst[1] == "" or srcdst[1] == "none":
srcdst[1] = None
else:
srcdst[1] = os.path.abspath(os.path.expanduser(srcdst[1]))
if os.path.isdir(chrootdir + "/" + srcdst[1]):
pwarning("%s has existed in %s , skip it." % (srcdst[1], chrootdir))
continue
chrootmounts.append(imgcreate.BindChrootMount(srcdst[0], chrootdir, srcdst[1]))
"""Default bind mounts"""
chrootmounts.append(imgcreate.BindChrootMount("/proc", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/proc/sys/fs/binfmt_misc", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/sys", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/dev", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/dev/pts", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/dev/shm", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/var/lib/dbus", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/var/run/dbus", chrootdir, None))
chrootmounts.append(imgcreate.BindChrootMount("/", chrootdir, "/parentroot", "ro"))
for kernel in os.listdir("/lib/modules"):
chrootmounts.append(imgcreate.BindChrootMount("/lib/modules/" + kernel, chrootdir, None, "ro"))
return chrootmounts
def bind_mount(chrootmounts):
for b in chrootmounts:
print "bind_mount: %s -> %s" % (b.src, b.dest)
b.mount()
def setup_resolv(chrootdir):
shutil.copyfile("/etc/resolv.conf", chrootdir + "/etc/resolv.conf")
globalmounts = get_bind_mounts(chrootdir, bindmounts)
bind_mount(globalmounts)
setup_resolv(chrootdir)
shutil.copyfile("/etc/mtab", chrootdir + "/etc/mtab")
chroot_lock = os.path.join(chrootdir, ".chroot.lock")
chroot_lockfd = open(chroot_lock, "w")
return globalmounts
def cleanup_mounts(chrootdir):
checkpoints = ["/proc/sys/fs/binfmt_misc", "/proc", "/sys", "/dev/pts", "/dev/shm", "/dev", "/var/lib/dbus", "/var/run/dbus"]
dev_null = os.open("/dev/null", os.O_WRONLY)
for point in checkpoints:
print point
args = [ "/bin/umount", "-l", chrootdir + point ]
subprocess.call(args, stdout=dev_null, stderr=dev_null)
args = [ "/bin/cat", "/proc/mounts" ]
proc_mounts = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=dev_null)
outputs = proc_mounts.communicate()[0].strip().split("\n")
for line in outputs:
if line.find(os.path.abspath(chrootdir)) >= 0:
if os.path.abspath(chrootdir) == line.split()[1]:
continue
point = line.split()[1]
print point
args = [ "/bin/umount", "-l", point ]
ret = subprocess.call(args, stdout=dev_null, stderr=dev_null)
if ret != 0:
print "ERROR: failed to unmount %s" % point
os.close(dev_null)
return ret
os.close(dev_null)
return 0
def cleanup_chrootenv(chrootdir, bindmounts = None, globalmounts = []):
global chroot_lockfd, chroot_lock
def bind_unmount(chrootmounts):
chrootmounts.reverse()
for b in chrootmounts:
print "bind_unmount: %s -> %s" % (b.src, b.dest)
b.unmount()
def cleanup_resolv(chrootdir):
fd = open(chrootdir + "/etc/resolv.conf", "w")
fd.truncate(0)
fd.close()
def kill_processes(chrootdir):
for file in glob.glob("/proc/*/root"):
try:
if os.readlink(file) == chrootdir:
pid = int(file.split("/")[2])
os.kill(pid, 9)
except:
pass
chroot_lockfd.close()
bind_unmount(globalmounts)
if not imgcreate.my_fuser(chroot_lock):
tmpdir = chrootdir + "/parentroot"
if len(os.listdir(tmpdir)) == 0:
shutil.rmtree(tmpdir, ignore_errors = True)
cleanup_resolv(chrootdir)
if os.path.exists(chrootdir + "/etc/mtab"):
os.unlink(chrootdir + "/etc/mtab")
kill_processes(chrootdir)
cleanup_mountdir(chrootdir, bindmounts)
class ImageMount:
def __init__(self, img):
self.img = img
self.imgsize = imgcreate.get_file_size(self.img) * 1024L * 1024L
self.imgmnt = imgcreate.mkdtemp()
self.imgtype = imgcreate.get_image_type(img)
def mount(self, targetdir):
if self.imgtype == "liveusb":
self.disk = imgcreate.SparseLoopbackDisk(self.img, self.imgsize)
self.imgloop = appcreate.PartitionedMount({'/dev/sdb':self.disk}, self.imgmnt, skipformat = True)
self.img_fstype = "vfat"
self.imgloop.add_partition(self.imgsize/1024/1024, "/dev/sdb", "/", self.img_fstype, boot=False)
elif self.imgtype == "livecd":
self.imgloop = imgcreate.DiskMount(imgcreate.LoopbackDisk(self.img, 0), self.imgmnt)
elif self.imgtype == "ext3fsimg":
self.extmnt = targetdir
self.extloop = imgcreate.ExtDiskMount(imgcreate.SparseLoopbackDisk(self.img, self.imgsize),
self.extmnt,
"ext3",
4096,
"ext3 label")
try:
self.extloop.mount()
self.os_image = self.img
return
except imgcreate.MountError, e:
self.extloop.cleanup()
shutil.rmtree(self.extmnt, ignore_errors = True)
shutil.rmtree(self.imgmnt, ignore_errors = True)
raise imgcreate.CreatorError("Failed to loopback mount '%s' : %s" %
(self.img, e))
else:
shutil.rmtree(self.imgmnt, ignore_errors = True)
raise imgcreate.CreatorError("I can't recognize image type of %s" % self.img)
try:
self.imgloop.mount()
except imgcreate.MountError, e:
self.imgloop.cleanup()
raise imgcreate.CreatorError("Failed to loopback mount '%s' : %s" %
(self.img, e))
# legacy LiveOS filesystem layout support, remove for F9 or F10
if os.path.exists(self.imgmnt + "/squashfs.img"):
squashimg = self.imgmnt + "/squashfs.img"
else:
squashimg = self.imgmnt + "/LiveOS/squashfs.img"
self.tmpoutdir = imgcreate.mkdtemp()
# unsquashfs requires outdir mustn't exist
shutil.rmtree(self.tmpoutdir, ignore_errors = True)
imgcreate.uncompress_squashfs(squashimg, self.tmpoutdir)
# legacy LiveOS filesystem layout support, remove for F9 or F10
if os.path.exists(self.tmpoutdir + "/os.img"):
self.os_image = self.tmpoutdir + "/os.img"
else:
self.os_image = self.tmpoutdir + "/LiveOS/ext3fs.img"
if not os.path.exists(self.os_image):
self.imgloop.cleanup()
shutil.rmtree(self.tmpoutdir, ignore_errors = True)
shutil.rmtree(imgmnt, ignore_errors = True)
raise imgcreate.CreatorError("'%s' is not a valid live CD ISO : neither "
"LiveOS/ext3fs.img nor os.img exist" %
base_on)
#unpack image to target dir
imgsize = imgcreate.get_file_size(self.os_image) * 1024L * 1024L
self.extmnt = targetdir
self.extloop = imgcreate.ExtDiskMount(imgcreate.SparseLoopbackDisk(self.os_image, imgsize),
self.extmnt,
"ext3",
4096,
"ext3 label")
try:
self.extloop.mount()
except imgcreate.MountError, e:
self.extloop.cleanup()
shutil.rmtree(self.extmnt, ignore_errors = True)
self.imgloop.cleanup()
shutil.rmtree(self.tmpoutdir, ignore_errors = True)
shutil.rmtree(self.imgmnt, ignore_errors = True)
raise imgcreate.CreatorError("Failed to loopback mount '%s' : %s" %
(os_image, e))
def cleanup(self):
self.extloop.cleanup()
if self.imgtype != "ext3fsimg":
self.imgloop.cleanup()
shutil.rmtree(self.tmpoutdir, ignore_errors = True)
shutil.rmtree(self.imgmnt, ignore_errors = True)
def chroot(chrootdir, bindmounts = None, execute = "/bin/bash"):
def mychroot():
os.chroot(chrootdir)
os.chdir("/")
""" Register qemu-arm-static if it is an ARM fs """
dev_null = os.open("/dev/null", os.O_WRONLY)
file = subprocess.Popen(["/usr/bin/file", chrootdir + "/sbin/init"], stdout=subprocess.PIPE, stderr=dev_null)
fileOutput = file.communicate()[0].strip().split("\n")
os.close(dev_null)
if file.returncode:
raise imgcreate.CreatorError("Failed to get architecture of /sbin/init")
need_qemu = False
i = 0
while i < len(fileOutput):
if fileOutput[i].find("ARM") > 0:
need_qemu = True
break
i = i + 1
if need_qemu:
imgcreate.setup_qemu_emulator(chrootdir, "arm")
try:
print "Launching shell. Exit to continue."
print "----------------------------------"
globalmounts = setup_chrootenv(chrootdir, bindmounts)
args = shlex.split(execute)
subprocess.call(args, preexec_fn = mychroot)
cleanup_chrootenv(chrootdir, bindmounts, globalmounts)
except OSError, (err, msg):
raise imgcreate.CreatorError("Failed to chroot: %s" % msg)
|
