cdist/lib/cdist/core/explorer.py

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# -*- coding: utf-8 -*-
#
# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
# 2011 Nico Schottelius (nico-cdist at schottelius.org)
#
# This file is part of cdist.
#
# cdist 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.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
#
import logging
import os
import cdist
log = logging.getLogger(__name__)
'''
common:
runs only remotely, needs local and remote
env:
__explorer: full qualified path to other global explorers on remote side == remote.global_explorer_path
global explorer is:
folder full of scripts which have to be:
(- copied to remote)
- executed one by one on remote
- output saved to local files
env:
creates: local files with explorer output
type explorer is:
folder full of scripts which have to be:
(- copied to remote)
- executed one by one on remote for each object instance
- output saved into object instance
env:
__object: full qualified path to the object's remote dir
__object_id: the objects id
__object_fq: full qualified object id, iow: $type.name + / + object_id
__type_explorer: full qualified path to the other type explorers on remote side
creates: nothing, all output is handled by the object instances
'''
class Explorer(object):
"""Executes cdist explorers.
"""
def __init__(self, target_host, local, remote):
self.target_host = target_host
self.local = local
self.remote = remote
self.env = {
'__target_host': self.target_host,
'__explorer': self.remote.global_explorer_path,
}
def transfer_global_explorers(self):
"""Transfer the global explorers to the remote side."""
self.remote.mkdir(self.remote.global_explorer_path)
self.remote.transfer(self.local.global_explorer_path, self.remote.global_explorer_path)
def run_global_explorer(self, explorer):
"""Run the given global explorer and return it's output."""
script = os.path.join(self.remote.global_explorer_path, explorer)
return self.remote.run_script(script, env=self.env)
def transfer_type_explorers(self, cdist_type):
"""Transfer the type explorers for the given type to the remote side."""
source = os.path.join(self.local.type_path, cdist_type.explorer_path)
destination = os.path.join(self.remote.type_path, cdist_type.explorer_path)
self.remote.mkdir(destination)
self.remote.transfer(source, destination)
# FIXME: should i do this? probably not
def transfer_object_parameters(self, cdist_object):
pass
def run_type_explorer(self, explorer, cdist_object):
"""Run the given type explorer for the given object and return it's output."""
cdist_type = cdist_object.type
env = self.env.copy()
env.update({
'__object': cdist_object.absolute_path,
'__object_id': cdist_object.object_id,
'__object_fq': cdist_object.path,
'__type_explorer': os.path.join(self.remote.type_path, cdist_type.explorer_path)
})
script = os.path.join(self.remote.type_path, cdist_type.explorer_path, explorer)
return self.remote.run_script(script, env=env)