def buildPath(self, base, *path):
''' assemble a path based on the base path.
arguments:
base -- the base path
*path -- list input that adds the path to the base path
'''
assert base, "no base variable passed, or value is None"
assert path, "no path variable passed, or value is None"
_file.buildPath(base, path)
def _copyDirs(self):
copyDirs = [
'bin', 'usr/bin'
]
for dir in copyDirs:
rPath = file.buildPath('/',dir)
chPath = file.buildPath(self.baseDir,dir)
## if os.path.exists(chPath):
## os.remove(chPath)
debug('%s --> %s' % (rPath,chPath), DEBUG)
shutil.copytree(rPath,chPath)
def __init__(self):
## Config options
self.baseDir = 'tmp/chroot'
self.useResolv = True
self.internalDev = False
self.umountCmds = [
'umount -n %s' % file.buildPath(self.baseDir,'proc'),
'umount -n %s' % file.buildPath(self.baseDir,'sys')
]
self.mountCmds = [
'mount -n -t proc chroot_proc %s' % file.buildPath(self.baseDir,'proc'),
'mount -n -t sysfs chroot_sysfs %s' % file.buildPath(self.baseDir,'sys'),
]
def init(self, location=None):
if not location:
self.baseDir = location
debug('attempting to lock chroot',DEBUG)
lock = self._getChrootLock()
if lock == True:
debug('got lock',DEBUG)
debug('creating base directory if needed',DEBUG)
file.mkdirIfAbsent(self.baseDir)
systemDirectories = [
'dev', 'opt', 'sbin',
'sbin', 'sys','lib','proc', 'etc',
'usr/lib'
]
debug('creating skeleton directories',DEBUG)
## build all the directories
for dir in systemDirectories:
built = file.buildPath(self.baseDir,dir)
file.mkdirIfAbsent(built)
## essential files
essentialFiles = [
file.buildPath(self.baseDir,'etc','mtab'),
file.buildPath(self.baseDir,'etc','fstab'),
]
map(file.touch,essentialFiles)
## if you want to use /etc/resolv.conf
if self.useResolv:
resolvPath = file.buildPath(self.baseDir,'etc','resolv.conf')
resolvDir = file.buildPath(self.baseDir,'etc')
## delete if it does exist
if os.path.exists(resolvPath):
os.remove(resolvPath)
## copy from your base system
shutil.copy2('/etc/resolv.conf', resolvDir)
## self._copyDirs()
if self.internalDev:
self._setupDev()
## try:
## self._mountall()
## if not self.chrootWasCleaned:
## self.chroot_setup_cmd = 'update'
## self._yum(self.chroot_setup_cmd, returnOutput=1)
## finally:
## self._umountall()
localTimeDir = file.buildPath(self.baseDir,'etc')
localTimePath = file.buildPath(self.baseDir,'etc', 'localtime')
if os.path.exists(localTimePath):
os.remove(localTimePath)
shutil.copy2('/etc/localtime', localTimeDir)
self._lddGet('gcc')
self._lddGet('ls')
def _setupDev(self):
## Clean up dev
file.rmDirectoryRecursive(file.buildPath(self.baseDir,"dev"))
file.mkdirIfAbsent(file.buildPath(self.baseDir,"dev", "pts"))
file.mkdirIfAbsent(file.buildPath(self.baseDir,"dev", "shm"))
prevMask = os.umask(0000)
devFiles = (
(stat.S_IFCHR | 0666, os.makedev(1, 3), "dev/null"),
(stat.S_IFCHR | 0666, os.makedev(1, 7), "dev/full"),
(stat.S_IFCHR | 0666, os.makedev(1, 5), "dev/zero"),
(stat.S_IFCHR | 0666, os.makedev(1, 8), "dev/random"),
(stat.S_IFCHR | 0444, os.makedev(1, 9), "dev/urandom"),
(stat.S_IFCHR | 0666, os.makedev(5, 0), "dev/tty"),
(stat.S_IFCHR | 0600, os.makedev(5, 1), "dev/console"),
(stat.S_IFCHR | 0666, os.makedev(5, 2), "dev/ptmx"),
)
for i in devFiles:
## create node
os.mknod(file.buildPath(self.baseDir, i[2]), i[0], i[1])
## set context. (only necessary if host running selinux enabled.)
## fails gracefully if chcon not installed.
## subprocess.Popen(
## ["chcon", "--reference=/%s"% i[2], self.makeChrootPath(i[2])]
## , raiseExc=0, shell=False)
## create all the stdin/stdout/stderr devices
os.symlink("/proc/self/fd/0", file.buildPath(self.baseDir,"dev/stdin"))
os.symlink("/proc/self/fd/1", file.buildPath(self.baseDir,"dev/stdout"))
os.symlink("/proc/self/fd/2", file.buildPath(self.baseDir,"dev/stderr"))
os.umask(prevMask)
devUnMount = [
'umount -n %s' % file.buildPath(self.baseDir,'/dev/pts'),
'umount -n %s' % file.buildPath(self.baseDir,'/dev/shm')
]
devMount = [
'mount -n -t devpts chroot_devpts %s' % file.buildPath(self.baseDir,'/dev/pts'),
'mount -n -t tmpfs chroot_shmfs %s' % file.buildPath(self.baseDir,'/dev/shm')
]
## mount/umount
for cmd in devUnMount:
if cmd not in self.umountCmds:
self.umountCmds.append(cmd)
for cmd in devMount:
if cmd not in self.mountCmds:
self.mountCmds.append(cmd)
