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# Authors: Tomas Babej <tbabej@redhat.com>
#
# Copyright (C) 2013 Red Hat
# see file 'COPYING' for use and warranty information
#
# 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 os
from ipalib import api
from ipalib.errors import ValidationError
from ipapython import admintool
from textwrap import wrap
"""
To add configuration instructions for a new use case, define a new class that
inherits from Advice class.
You should create a plugin file for it in ipaserver/advise/plugins folder.
The class can run any arbitrary code or IPA command via api.Command['command']()
calls. It needs to override get_info() method, which returns the formatted
advice string.
>>> class sample_advice(Advice):
>>> description = 'Instructions for machine with SSSD 1.0 setup.'
Description provided shows itself as a header and in the list of all advices
currently available via ipa-advise.
Optionally, you can require root privileges for your plugin:
>>> require_root = True
The following method should be implemented in your plugin:
>>> def get_info():
>>> self.log.debug('Entering execute() method')
>>> self.log.comment('Providing useful advice just for you')
>>> self.log.command('yum update sssd -y')
As you can see, Advice's log has 3 different levels. Debug lines are printed
out with '# DEBUG:' prefix if --verbose had been used. Comment lines utilize
'# ' prefix and command lines are printed raw.
Please note that comments are automatically wrapped after 70 characters.
Use wrapped=False option to force the unwrapped line in the comment.
>>> self.log.comment("This line should not be wrapped", wrapped=False)
As a result, you can redirect the advice's output directly to a script file.
# ipa-advise sample-advice > script.sh
# ./script.sh
Important! Do not forget to register the class to the API.
>>> api.register(sample_advice)
"""
class IpaAdvise(admintool.AdminTool):
"""
Admin tool that given systems's configuration provides instructions how to
configure the systems for various use cases.
"""
command_name = 'ipa-advise'
usage = "%prog ADVICE"
description = "Provides configuration advice for various use cases. To "\
"see the list of possible ADVICEs, run ipa-advise without "\
"any arguments."
def __init__(self, options, args):
super(IpaAdvise, self).__init__(options, args)
@classmethod
def add_options(cls, parser):
super(IpaAdvise, cls).add_options(parser)
def validate_options(self):
super(IpaAdvise, self).validate_options(needs_root=False)
if len(self.args) > 1:
raise self.option_parser.error("You can only provide one "
"positional argument.")
def log_success(self):
pass
def print_config_list(self):
self.print_header('List of available advices')
max_keyword_len = max((len(keyword) for keyword in api.Advice))
for keyword in api.Advice:
advice = getattr(api.Advice, keyword, '')
description = getattr(advice, 'description', '')
keyword = keyword.replace('_', '-')
# Compute the number of spaces needed for the table to be aligned
offset = max_keyword_len - len(keyword)
prefix = " {key} {off}: ".format(key=keyword, off=' ' * offset)
wrapped_description = wrap(description, 80 - len(prefix))
# Print the first line with the prefix (keyword)
print prefix + wrapped_description[0]
# Print the rest wrapped behind the colon
for line in wrapped_description[1:]:
print "{off}{line}".format(off=' ' * len(prefix), line=line)
def print_header(self, header, print_shell=False):
header_size = len(header)
prefix = ''
if print_shell:
prefix = '# '
print '#!/bin/sh'
# Do not print out empty header
if header_size > 0:
print(prefix + '-' * 70)
for line in wrap(header, 70):
print(prefix + line)
print(prefix + '-' * 70)
def print_advice(self, keyword):
advice = getattr(api.Advice, keyword, None)
# Ensure that Configuration class for given --setup option value exists
if advice is None:
raise ValidationError(
name="advice",
error="No instructions are available for '{con}'. "
"See the list of available configuration "
"by invoking the ipa-advise command with no argument."
.format(con=keyword.replace('_', '-')))
# Check whether root privileges are needed
if advice.require_root and os.getegid() != 0:
raise admintool.ScriptError(
'Must be root to get advice for {adv}'
.format(adv=keyword.replace('_', '-')), 1)
# Print out nicely formatted header
self.print_header(advice.description, print_shell=True)
# Set options so that plugin can use verbose/quiet options
advice.set_options(self.options)
# Print out the actual advice
api.Backend.xmlclient.connect()
advice.get_info()
api.Backend.xmlclient.disconnect()
for line in advice.log.content:
print line
def run(self):
super(IpaAdvise, self).run()
api.bootstrap(in_server=False, context='advise')
api.finalize()
# With no argument, print the list out and exit
if not self.args:
self.print_config_list()
return
else:
keyword = self.args[0].replace('-', '_')
self.print_advice(keyword)
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