# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import copy
import json
import os
import stat
import subprocess
from yaml import load, YAMLError
from ansible.compat.six import text_type, string_types
from ansible.errors import AnsibleFileNotFound, AnsibleParserError, AnsibleError
from ansible.errors.yaml_strings import YAML_SYNTAX_ERROR
from ansible.parsing.vault import VaultLib
from ansible.parsing.splitter import unquote
from ansible.parsing.yaml.loader import AnsibleLoader
from ansible.parsing.yaml.objects import AnsibleBaseYAMLObject, AnsibleUnicode
from ansible.module_utils.basic import is_executable
from ansible.utils.path import unfrackpath
from ansible.utils.unicode import to_unicode
class DataLoader():
'''
The DataLoader class is used to load and parse YAML or JSON content,
either from a given file name or from a string that was previously
read in through other means. A Vault password can be specified, and
any vault-encrypted files will be decrypted.
Data read from files will also be cached, so the file will never be
read from disk more than once.
Usage:
dl = DataLoader()
(or)
dl = DataLoader(vault_password='foo')
ds = dl.load('...')
ds = dl.load_from_file('/path/to/file')
'''
def __init__(self):
self._basedir = '.'
self._FILE_CACHE = dict()
# initialize the vault stuff with an empty password
self.set_vault_password(None)
def set_vault_password(self, vault_password):
self._vault_password = vault_password
self._vault = VaultLib(password=vault_password)
def load(self, data, file_name='<string>', show_content=True):
'''
Creates a python datastructure from the given data, which can be either
a JSON or YAML string.
'''
try:
# we first try to load this data as JSON
return json.loads(data)
except:
# if loading JSON failed for any reason, we go ahead
# and try to parse it as YAML instead
if isinstance(data, AnsibleUnicode):
# The PyYAML's libyaml bindings use PyUnicode_CheckExact so
# they are unable to cope with our subclass.
# Unwrap and re-wrap the unicode so we can keep track of line
# numbers
new_data = text_type(data)
else:
new_data = data
try:
new_data = self._safe_load(new_data, file_name=file_name)
except YAMLError as yaml_exc:
self._handle_error(yaml_exc, file_name, show_content)
if isinstance(data, AnsibleUnicode):
new_data = AnsibleUnicode(new_data)
new_data.ansible_pos = data.ansible_pos
return new_data
def load_from_file(self, file_name):
''' Loads data from a file, which can contain either JSON or YAML. '''
file_name = self.path_dwim(file_name)
# if the file has already been read in and cached, we'll
# return those results to avoid more file/vault operations
if file_name in self._FILE_CACHE:
parsed_data = self._FILE_CACHE[file_name]
else:
# read the file contents and load the data structure from them
(file_data, show_content) = self._get_file_contents(file_name)
parsed_data = self.load(data=file_data, file_name=file_name, show_content=show_content)
# cache the file contents for next time
self._FILE_CACHE[file_name] = parsed_data
# return a deep copy here, so the cache is not affected
return copy.deepcopy(parsed_data)
def path_exists(self, path):
path = self.path_dwim(path)
return os.path.exists(path)
def is_file(self, path):
path = self.path_dwim(path)
return os.path.isfile(path) or path == os.devnull
def is_directory(self, path):
path = self.path_dwim(path)
return os.path.isdir(path)
def list_directory(self, path):
path = self.path_dwim(path)
return os.listdir(path)
def is_executable(self, path):
'''is the given path executable?'''
path = self.path_dwim(path)
return is_executable(path)
def _safe_load(self, stream, file_name=None):
''' Implements yaml.safe_load(), except using our custom loader class. '''
loader = AnsibleLoader(stream, file_name)
try:
return loader.get_single_data()
finally:
loader.dispose()
def _get_file_contents(self, file_name):
'''
Reads the file contents from the given file name, and will decrypt them
if they are found to be vault-encrypted.
'''
if not file_name or not isinstance(file_name, string_types):
raise AnsibleParserError("Invalid filename: '%s'" % str(file_name))
if not self.path_exists(file_name) or not self.is_file(file_name):
raise AnsibleFileNotFound("the file_name '%s' does not exist, or is not readable" % file_name)
show_content = True
try:
with open(file_name, 'rb') as f:
data = f.read()
if self._vault.is_encrypted(data):
data = self._vault.decrypt(data)
show_content = False
data = to_unicode(data, errors='strict')
return (data, show_content)
except (IOError, OSError) as e:
raise AnsibleParserError("an error occurred while trying to read the file '%s': %s" % (file_name, str(e)))
def _handle_error(self, yaml_exc, file_name, show_content):
'''
Optionally constructs an object (AnsibleBaseYAMLObject) to encapsulate the
file name/position where a YAML exception occurred, and raises an AnsibleParserError
to display the syntax exception information.
'''
# if the YAML exception contains a problem mark, use it to construct
# an object the error class can use to display the faulty line
err_obj = None
if hasattr(yaml_exc, 'problem_mark'):
err_obj = AnsibleBaseYAMLObject()
err_obj.ansible_pos = (file_name, yaml_exc.problem_mark.line + 1, yaml_exc.problem_mark.column + 1)
raise AnsibleParserError(YAML_SYNTAX_ERROR, obj=err_obj, show_content=show_content)
def get_basedir(self):
''' returns the current basedir '''
return self._basedir
def set_basedir(self, basedir):
''' sets the base directory, used to find files when a relative path is given '''
if basedir is not None:
self._basedir = to_unicode(basedir)
def path_dwim(self, given):
'''
make relative paths work like folks expect.
'''
given = unquote(given)
if given.startswith("/"):
return os.path.abspath(given)
elif given.startswith("~"):
return os.path.abspath(os.path.expanduser(given))
else:
return os.path.abspath(os.path.join(self._basedir, given))
def path_dwim_relative(self, path, dirname, source):
'''
find one file in either a role or playbook dir with or without
explicitly named dirname subdirs
Used in action plugins and lookups to find supplemental files that
could be in either place.
'''
search = []
isrole = False
# I have full path, nothing else needs to be looked at
if source.startswith('~') or source.startswith('/'):
search.append(self.path_dwim(source))
else:
# base role/play path + templates/files/vars + relative filename
search.append(os.path.join(path, dirname, source))
basedir = unfrackpath(path)
# is it a role and if so make sure you get correct base path
if path.endswith('tasks') and os.path.exists(os.path.join(path,'main.yml')) \
or os.path.exists(os.path.join(path,'tasks/main.yml')):
isrole = True
if path.endswith('tasks'):
basedir = unfrackpath(os.path.dirname(path))
cur_basedir = self._basedir
self.set_basedir(basedir)
# resolved base role/play path + templates/files/vars + relative filename
search.append(self.path_dwim(os.path.join(basedir, dirname, source)))
self.set_basedir(cur_basedir)
if isrole and not source.endswith(dirname):
# look in role's tasks dir w/o dirname
search.append(self.path_dwim(os.path.join(basedir, 'tasks', source)))
# try to create absolute path for loader basedir + templates/files/vars + filename
search.append(self.path_dwim(os.path.join(dirname,source)))
search.append(self.path_dwim(os.path.join(basedir, source)))
# try to create absolute path for loader basedir + filename
search.append(self.path_dwim(source))
for candidate in search:
if os.path.exists(candidate):
break
return candidate
def read_vault_password_file(self, vault_password_file):
"""
Read a vault password from a file or if executable, execute the script and
retrieve password from STDOUT
"""
this_path = os.path.realpath(os.path.expanduser(vault_password_file))
if not os.path.exists(this_path):
raise AnsibleFileNotFound("The vault password file %s was not found" % this_path)
if self.is_executable(this_path):
try:
# STDERR not captured to make it easier for users to prompt for input in their scripts
p = subprocess.Popen(this_path, stdout=subprocess.PIPE)
except OSError as e:
raise AnsibleError("Problem running vault password script %s (%s). If this is not a script, remove the executable bit from the file." % (' '.join(this_path), e))
stdout, stderr = p.communicate()
self.set_vault_password(stdout.strip('\r\n'))
else:
try:
f = open(this_path, "rb")
self.set_vault_password(f.read().strip())
f.close()
except (OSError, IOError) as e:
raise AnsibleError("Could not read vault password file %s: %s" % (this_path, e))