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| Dir : //usr/lib/python3.6/site-packages/SSSDConfig/ipachangeconf.py |
"""
ipachangeconf - configuration file manipulation classes and functions
partially based on authconfig code
Copyright (c) 1999-2007 Red Hat, Inc.
Author: Simo Sorce <ssorce@redhat.com>
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 3 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 <http://www.gnu.org/licenses/>.
"""
import fcntl
import os
import shutil
import re
def openLocked(filename, perms, create=True):
fd = -1
flags = os.O_RDWR
if create:
flags = flags | os.O_CREAT
try:
fd = os.open(filename, flags, perms)
fcntl.lockf(fd, fcntl.LOCK_EX)
except OSError as err:
errno, strerr = err.args
if fd != -1:
try:
os.close(fd)
except OSError:
pass
raise IOError(errno, strerr)
return os.fdopen(fd, "r+")
class IPAChangeConf(object):
def __init__(self, name):
self.progname = name
self.indent = ("", "", "")
self.assign = (" = ", "=")
self.dassign = self.assign[0]
self.comment = ("#",)
self.dcomment = self.comment[0]
self.eol = ("\n",)
self.deol = self.eol[0]
self.sectnamdel = ("[", "]")
self.subsectdel = ("{", "}")
self.backup_suffix = ".ipabkp"
def setProgName(self, name):
self.progname = name
def setIndent(self, indent):
if type(indent) is tuple:
self.indent = indent
elif type(indent) is str:
self.indent = (indent, )
else:
raise ValueError('Indent must be a list of strings')
def setOptionAssignment(self, assign):
if type(assign) is tuple:
self.assign = assign
else:
self.assign = (assign, )
self.dassign = self.assign[0]
def setCommentPrefix(self, comment):
if type(comment) is tuple:
self.comment = comment
else:
self.comment = (comment, )
self.dcomment = self.comment[0]
def setEndLine(self, eol):
if type(eol) is tuple:
self.eol = eol
else:
self.eol = (eol, )
self.deol = self.eol[0]
def setSectionNameDelimiters(self, delims):
self.sectnamdel = delims
def setSubSectionDelimiters(self, delims):
self.subsectdel = delims
def matchComment(self, line):
for v in self.comment:
if line.lstrip().startswith(v):
return line.lstrip()[len(v):]
return False
def matchEmpty(self, line):
if line.strip() == "":
return True
return False
def matchSection(self, line):
cl = "".join(line.strip().split())
if len(self.sectnamdel) != 2:
return False
if not cl.startswith(self.sectnamdel[0]):
return False
if not cl.endswith(self.sectnamdel[1]):
return False
return cl[len(self.sectnamdel[0]):-len(self.sectnamdel[1])]
def matchSubSection(self, line):
if self.matchComment(line):
return False
parts = line.split(self.dassign, 1)
if len(parts) < 2:
return False
if parts[1].strip() == self.subsectdel[0]:
return parts[0].strip()
return False
def matchSubSectionEnd(self, line):
if self.matchComment(line):
return False
if line.strip() == self.subsectdel[1]:
return True
return False
def getSectionLine(self, section):
if len(self.sectnamdel) != 2:
return section
return self.sectnamdel[0] + section + self.sectnamdel[1] + self.deol
@staticmethod
def _get_debug_level_val(value):
if value > 16:
value = hex(value)
return value
def dump(self, options, level=0):
output = ""
if level >= len(self.indent):
level = len(self.indent) - 1
for o in options:
if o['type'] == "section":
output += self.sectnamdel[0] + o['name'] + self.sectnamdel[1] + self.deol
output += self.dump(o['value'], level + 1)
continue
if o['type'] == "subsection":
output += self.indent[level] + o['name'] + self.dassign + self.subsectdel[0] + self.deol
output += self.dump(o['value'], level + 1)
output += self.indent[level] + self.subsectdel[1] + self.deol
continue
if o['type'] == "option":
output += self.indent[level] + o['name'] + self.dassign + o['value'] + self.deol
continue
if o['type'] == "comment":
output += self.dcomment + o['value'] + self.deol
continue
if o['type'] == "empty":
output += self.deol
continue
raise SyntaxError('Unknown type: [' + o['type'] + ']')
return output
def parseLine(self, line):
if self.matchEmpty(line):
return {'name': 'empty', 'type': 'empty'}
value = self.matchComment(line)
if value:
return {'name': 'comment', 'type': 'comment', 'value': value.rstrip()}
parts = line.split(self.dassign, 1)
if len(parts) < 2:
raise SyntaxError('Syntax Error: Unknown line format')
return {'name': parts[0].strip(), 'type': 'option', 'value': parts[1].rstrip()}
def findOpts(self, opts, type, name, exclude_sections=False):
num = 0
for o in opts:
if o['type'] == type and o['name'] == name:
return (num, o)
if exclude_sections and (o['type'] == "section" or o['type'] == "subsection"):
return (num, None)
num += 1
return (num, None)
def commentOpts(self, inopts, level=0):
opts = []
if level >= len(self.indent):
level = len(self.indent) - 1
for o in inopts:
if o['type'] == 'section':
no = self.commentOpts(o['value'], level + 1)
val = self.dcomment + self.sectnamdel[0] + o['name'] + self.sectnamdel[1]
opts.append({'name': 'comment', 'type': 'comment', 'value': val})
for n in no:
opts.append(n)
continue
if o['type'] == 'subsection':
no = self.commentOpts(o['value'], level + 1)
val = self.indent[level] + o['name'] + self.dassign + self.subsectdel[0]
opts.append({'name': 'comment', 'type': 'comment', 'value': val})
for n in no:
opts.append(n)
val = self.indent[level] + self.subsectdel[1]
opts.append({'name': 'comment', 'type': 'comment', 'value': val})
continue
if o['type'] == 'option':
val = self.indent[level] + o['name'] + self.dassign + o['value']
opts.append({'name': 'comment', 'type': 'comment', 'value': val})
continue
if o['type'] == 'comment':
opts.append(o)
continue
if o['type'] == 'empty':
opts.append({'name': 'comment', 'type': 'comment', 'value': ''})
continue
raise SyntaxError('Unknown type: [' + o['type'] + ']')
return opts
def mergeOld(self, oldopts, newopts):
opts = []
for o in oldopts:
if o['type'] == "section" or o['type'] == "subsection":
(num, no) = self.findOpts(newopts, o['type'], o['name'])
if not no:
opts.append(o)
continue
if no['action'] == "set":
mo = self.mergeOld(o['value'], no['value'])
opts.append({'name': o['name'], 'type': o['type'], 'value': mo})
continue
if no['action'] == "comment":
co = self.commentOpts(o['value'])
for c in co:
opts.append(c)
continue
if no['action'] == "remove":
continue
raise SyntaxError('Unknown action: [' + no['action'] + ']')
if o['type'] == "comment" or o['type'] == "empty":
opts.append(o)
continue
if o['type'] == "option":
(num, no) = self.findOpts(newopts, 'option', o['name'], True)
if not no:
opts.append(o)
continue
if no['action'] == 'comment' or no['action'] == 'remove':
if no['value'] is not None and o['value'] != no['value']:
opts.append(o)
continue
if no['action'] == 'comment':
opts.append({'name': 'comment', 'type': 'comment',
'value': self.dcomment + o['name'] + self.dassign + o['value']})
continue
if no['action'] == 'set':
opts.append(no)
continue
raise SyntaxError('Unknown action: [' + o['action'] + ']')
raise SyntaxError('Unknown type: [' + o['type'] + ']')
return opts
def mergeNew(self, opts, newopts):
cline = 0
for no in newopts:
if no['type'] == "section" or no['type'] == "subsection":
(num, o) = self.findOpts(opts, no['type'], no['name'])
if not o:
if no['action'] == 'set':
opts.append(no)
continue
if no['action'] == "set":
self.mergeNew(o['value'], no['value'])
continue
cline = num + 1
continue
if no['type'] == "option":
(num, o) = self.findOpts(opts, no['type'], no['name'], True)
if not o:
if no['action'] == 'set':
opts.append(no)
continue
cline = num + 1
continue
if no['type'] == "comment" or no['type'] == "empty":
opts.insert(cline, no)
cline += 1
continue
raise SyntaxError('Unknown type: [' + no['type'] + ']')
def merge(self, oldopts, newopts):
"""
Use a two pass strategy
First we create a new opts tree from oldopts removing/commenting
the options as indicated by the contents of newopts
Second we fill in the new opts tree with options as indicated
in the newopts tree (this is because entire (sub)sections may
exist in the newopts that do not exist in oldopts)
"""
opts = self.mergeOld(oldopts, newopts)
self.mergeNew(opts, newopts)
return opts
# TODO: Make parse() recursive?
def parse(self, f):
opts = []
sectopts = []
section = None
subsectopts = []
subsection = None
curopts = opts
fatheropts = opts
# Read in the old file.
for line in f:
# It's a section start.
value = self.matchSection(line)
if value:
if section is not None:
opts.append({'name': section, 'type': 'section', 'value': sectopts})
sectopts = []
curopts = sectopts
fatheropts = sectopts
section = value
continue
# It's a subsection start.
value = self.matchSubSection(line)
if value:
if subsection is not None:
raise SyntaxError('nested subsections are not supported yet')
subsectopts = []
curopts = subsectopts
subsection = value
continue
value = self.matchSubSectionEnd(line)
if value:
if subsection is None:
raise SyntaxError('Unmatched end subsection terminator found')
fatheropts.append({'name': subsection, 'type': 'subsection', 'value': subsectopts})
subsection = None
curopts = fatheropts
continue
# Copy anything else as is.
curopts.append(self.parseLine(line))
# Add last section if any
if sectopts:
opts.append({'name': section, 'type': 'section', 'value': sectopts})
return opts
def changeConf(self, file, newopts):
"""Write settings to configuration file
file is a path
options is a set of dictionaries in the form:
[{'name': 'foo', 'value': 'bar', 'action': 'set/comment'}]
section is a section name like 'global'
"""
output = ""
f = None
try:
# Do not catch an unexisting file error, we want to fail in that case
shutil.copy2(file, file + self.backup_suffix)
f = openLocked(file, 0o644)
oldopts = self.parse(f)
options = self.merge(oldopts, newopts)
output = self.dump(options)
# Write it out and close it.
f.seek(0)
f.truncate(0)
f.write(output)
finally:
try:
if f:
f.close()
except IOError:
pass
return True
def newConf(self, file, options):
"""Write settings to new file, backup old
file is a path
options is a set of dictionaries in the form:
[{'name': 'foo', 'value': 'bar', 'action': 'set/comment'}]
section is a section name like 'global'
"""
output = ""
f = None
try:
try:
shutil.copy2(file, file + self.backup_suffix)
except IOError as err:
if err.errno == 2:
# The orign file did not exist
pass
f = openLocked(file, 0o644)
# Truncate
f.seek(0)
f.truncate(0)
output = self.dump(options)
f.write(output)
finally:
try:
if f:
f.close()
except IOError:
pass
return True
class SSSDChangeConf(IPAChangeConf):
"""An SSSD-specific subclass of IPAChangeConf"""
OPTCRE = re.compile(
r'\s*(?P<option>[^:=\s][^:=]*)' # very permissive!
r'\s*=\s*' # any number of space/tab,
# followed by separator
# followed by any # space/tab
r'(?P<value>.*)$' # everything up to EOL
)
def __init__(self):
IPAChangeConf.__init__(self, "SSSD")
self.comment = ("#", ";")
self.backup_suffix = ".bak"
self.opts = []
def parseLine(self, line):
"""
Overrides IPAChangeConf parseLine so that lines are split
using any separator in self.assign, not just the default one
"""
if self.matchEmpty(line):
return {'name': 'empty', 'type': 'empty'}
value = self.matchComment(line)
if value:
return {'name': 'comment', 'type': 'comment', 'value': value.rstrip()}
mo = self.OPTCRE.match(line)
if not mo:
raise SyntaxError('Syntax Error: Unknown line format')
try:
name, value = mo.group('option', 'value')
except IndexError:
raise SyntaxError('Syntax Error: Unknown line format')
return {'name': name.strip(), 'type': 'option', 'value': value.strip()}
def readfp(self, fd):
self.opts.extend(self.parse(fd))
def read(self, filename):
fd = open(filename, 'r')
self.readfp(fd)
fd.close()
def get(self, section, name):
index, item = self.get_option_index(section, name)
if item:
return item['value']
def set(self, section, name, value):
modkw = {'type': 'section',
'name': section,
'value': [{
'type': 'option',
'name': name,
'value': value,
'action': 'set',
}],
'action': 'set',
}
self.opts = self.merge(self.opts, [modkw])
def add_section(self, name, optkw, index=0):
optkw.append({'type': 'empty', 'value': 'empty'})
addkw = {'type': 'section',
'name': name,
'value': optkw}
self.opts.insert(index, addkw)
def delete_section(self, name):
self.delete_option('section', name)
def sections(self):
return [o for o in self.opts if o['type'] == 'section']
def has_section(self, section):
return len([o for o in self.opts if o['type'] == 'section' if o['name'] == section]) > 0
def options(self, section):
for opt in self.opts:
if opt['type'] == 'section' and opt['name'] == section:
return opt['value']
def delete_option(self, type, name, exclude_sections=False):
return self.delete_option_subtree(self.opts, type, name)
def delete_option_subtree(self, subtree, type, name, exclude_sections=False):
index, item = self.findOpts(subtree, type, name, exclude_sections)
if item:
del subtree[index]
return index
def has_option(self, section, name):
index, item = self.get_option_index(section, name)
if index != -1 and item is not None:
return True
return False
def strip_comments_empty(self, optlist):
retlist = []
for opt in optlist:
if opt['type'] in ('comment', 'empty'):
continue
retlist.append(opt)
return retlist
def get_option_index(self, parent_name, name, type='option'):
subtree = None
if parent_name:
pindex, pdata = self.findOpts(self.opts, 'section', parent_name)
if not pdata:
return (-1, None)
subtree = pdata['value']
else:
subtree = self.opts
return self.findOpts(subtree, type, name)