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#!/usr/bin/env python
'''This is the basic toolset class for the Bcfg2 client'''
__revision__ = '$Revision$'
from binascii import a2b_base64
from grp import getgrgid, getgrnam
from os import chown, chmod, lstat, mkdir, stat, system, unlink, rename, readlink, symlink
from pwd import getpwuid, getpwnam
from stat import S_ISVTX, S_ISGID, S_ISUID, S_IXUSR, S_IWUSR, S_IRUSR, S_IXGRP
from stat import S_IWGRP, S_IRGRP, S_IXOTH, S_IWOTH, S_IROTH, ST_MODE, S_ISDIR
from stat import S_IFREG, ST_UID, ST_GID, S_ISREG, S_IFDIR, S_ISLNK
from sys import exc_info
from time import asctime, localtime
from traceback import extract_tb
from elementtree.ElementTree import Element, SubElement, tostring
def calc_perms(initial, perms):
'''This compares ondisk permissions with specified ones'''
tempperms = initial
if len(perms) == 3:
perms = '0%s' % (perms)
[suid, user, group, other] = [perms[int(x)] for x in range(4)]
for (num, perm) in {1:S_ISVTX, 2:S_ISGID, 4:S_ISUID}.iteritems():
if suid & num:
tempperms |= perm
for (num, perm) in {1:S_IXUSR, 2:S_IWUSR, 4:S_IRUSR}.iteritems():
if user & num:
tempperms |= perm
for (num, perm) in {1:S_IXGRP, 2:S_IWGRP, 4:S_IRGRP}.iteritems():
if group & num:
tempperms |= perm
for (num, perm) in {1:S_IXOTH, 2:S_IWOTH, 4:S_IROTH}.iteritems():
if other & num:
tempperms |= perm
return tempperms
class Toolset(object):
'''The toolset class contains underlying command support and all states'''
__important__ = []
def __init__(self, cfg, setup):
'''Install initial configs, and setup state structures'''
object.__init__(self)
self.setup = setup
self.cfg = cfg
self.states = {}
self.structures = {}
self.modified = []
self.extra = []
if self.__important__:
for cfile in cfg.findall(".//ConfigFile"):
for name in self.__important__:
if cfile.get("name") == name:
self.InstallConfigFile(cfile)
def LogFailure(self, area, entry):
'''Print tracebacks in unexpected cases'''
print "Failure in %s for entry: %s" % (area, tostring(entry))
(t, v, tb) = exc_info()
for line in extract_tb(tb):
print "File %s, line %i, in %s\n %s\n" % (line)
print "%s: %s\n" % (t, v)
del t, v, tb
def print_failure(self):
'''Display curses style failure message'''
if self.setup['verbose']:
print "\033[60G[\033[1;31mFAILED\033[0;39m]\r"
def print_success(self):
'''Display curses style success message'''
if self.setup['verbose']:
print "\033[60G[ \033[1;32mOK\033[0;39m ]\r"
# These next functions form the external API
def Inventory(self):
# build initial set of states
unexamined = [(x, []) for x in self.cfg.getchildren()]
while unexamined:
(r, modlist) = unexamined.pop()
if r.tag not in ['Bundle', 'Independant']:
self.VerifyEntry(r, modlist)
else:
modlist = [x.get('name') for x in r.getchildren() if x.tag == 'ConfigFile']
unexamined += [(x, modlist) for x in r.getchildren()]
self.structures[r] = False
for structure in self.cfg.getchildren():
self.CheckStructure(structure)
def CheckStructure(self, structure):
'''Check structures with bundle verification semantics'''
if structure in self.modified:
self.modified.remove(structure)
if structure.tag == 'Bundle':
# check for clobbered data
modlist = [x.get('name') for x in structure.getchildren() if x.tag == 'ConfigFile']
for entry in structure.getchildren():
self.VerifyEntry(entry, modlist)
try:
state = [self.states[x] for x in structure.getchildren()]
if False not in state:
self.structures[structure] = True
except KeyError, k:
print "State verify evidently failed for %s" % (k)
self.structures[structure] = False
def Install(self):
'''Baseline Installation method based on current entry states'''
self.modified = [k for (k, v) in self.structures.iteritems() if not v]
for entry in [k for (k, v) in self.states.iteritems() if not v]:
self.InstallEntry(entry)
def GenerateStats(self):
'''Generate XML summary of execution statistics'''
stats = Element("Statistics")
SubElement(stats, "Structures", good=str(len([k for k, v in self.structures.iteritems() if v])), \
bad=str(len([k for k, v in self.structures.iteritems() if not v])))
SubElement(stats, "Entries", good=str(len([k for k, v in self.states.iteritems() if v])), \
bad=str(len([k for k, v in self.states.iteritems() if not v])))
if len([k for k, v in self.structures.iteritems() if not v]) == 0:
stats.set('state', 'clean')
else:
stats.set('state', 'dirty')
stats.set('time', asctime(localtime()))
return stats
# the next two are dispatch functions
def VerifyEntry(self, entry, modlist = []):
'''Dispatch call to Verify<tagname> and save state in self.states'''
try:
method = getattr(self, "Verify%s"%(entry.tag))
# verify state and stash value in state
if entry.tag == 'Package':
self.states[entry] = method(entry, modlist)
else:
self.states[entry] = method(entry)
if self.setup['debug']:
print entry.get('name'), self.states[entry]
except:
self.LogFailure("Verify", entry)
def InstallEntry(self, entry):
'''Dispatch call to self.Install<tagname>'''
try:
method = getattr(self, "Install%s"%(entry.tag))
self.states[entry] = method(entry)
except:
self.LogFailure("Install", entry)
# All remaining operations implement the mechanics of POSIX cfg elements
def VerifySymLink(self, entry):
try:
s = readlink(entry.get('name'))
if s == entry.get('to'):
return True
return False
except OSError:
return False
def InstallSymLink(self, entry):
try:
fmode = lstat(entry.get('name'))[ST_MODE]
if S_ISREG(fmode) or S_ISLNK(fmode):
unlink(entry.get('name'))
elif S_ISDIR(fmode):
system("mv %s/ %s.bak" % (entry.get('name'), entry.get('name')))
else:
unlink(entry.get('name'))
except OSError:
print "Symlink %s cleanup failed" % (entry.get('name'))
try:
symlink(entry.get('to'), entry.get('name'))
except OSError, e:
return False
def VerifyDirectory(self, entry):
try:
ondisk = stat(entry.get('name'))
except OSError:
return False
try:
owner = getpwuid(ondisk[ST_UID])[0]
group = getgrgid(ondisk[ST_GID])[0]
except OSError:
owner = 'root'
group = 'root'
perms = stat(entry.get('name'))[ST_MODE]
if ((owner == entry.get('owner')) and
(group == entry.get('group')) and
(perms == calc_perms(S_IFDIR, entry.get('perms')))):
return True
else:
return False
def InstallDirectory(self, entry):
try:
fmode = lstat(entry.get('name'))
if not S_ISDIR(fmode[0]):
try:
unlink(entry.get('name'))
except:
return False
except OSError:
print "Failed to cleanup for directory %s" % (entry.get('name'))
try:
mkdir(entry.get('name'))
except OSError:
return False
try:
chown(entry.get('name'),
getpwnam(entry.get('owner'))[2], getgrnam(entry.get('group'))[2])
chmod(entry.get('name'), entry.get('perms'))
except:
return False
def VerifyConfigFile(self, entry):
try:
ondisk = stat(entry.get('name'))
except OSError:
return False
try:
data = open(entry.get('name')).read()
except IOError:
return False
try:
owner = getpwuid(ondisk[ST_UID])[0]
group = getgrgid(ondisk[ST_GID])[0]
except KeyError:
return False
perms = stat(entry.get('name'))[ST_MODE]
if entry.get('encoding', 'ascii') == 'base64':
tempdata = a2b_base64(entry.text)
else:
tempdata = entry.text
if ((data == tempdata) and (owner == entry.get('owner')) and
(group == entry.get('group')) and (perms == calc_perms(S_IFREG, entry.get('perms')))):
return True
return False
def InstallConfigFile(self, entry):
if self.setup['dryrun'] or self.setup['verbose']:
print "Installing ConfigFile %s" % (entry.get('name'))
if self.setup['dryrun']:
return False
parent = "/".join(entry.get('name').split('/')[:-1])
if parent:
try:
s = lstat(parent)
try:
if not S_ISDIR(s[ST_MODE]):
unlink(parent)
mkdir(parent)
except OSError:
return False
except OSError:
# need to handle mkdir -p case
mkdir(parent)
# If we get here, then the parent directory should exist
try:
newfile = open("%s.new"%(entry.get('name')), 'w')
if entry.attrib.get('encoding', 'ascii') == 'base64':
filedata = a2b_base64(entry.text)
else:
filedata = entry.text
newfile.write(filedata)
newfile.close()
try:
chown(newfile.name, getpwnam(entry.get('owner'))[2], getgrnam(entry.get('group'))[2])
except:
chown(newfile.name, 0, 0)
chmod(newfile.name, calc_perms(S_IFREG, entry.get('perms')))
if entry.get("paranoid", False) and self.setup.get("paranoid", False):
system("cp %s /var/cache/bcfg2/%s" % (entry.get('name')))
rename(newfile.name, entry.get('name'))
return True
except (OSError, IOError), e:
print e
return False
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