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# (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/>.
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import os
import base64
from ansible.errors import AnsibleError
from ansible.module_utils._text import to_bytes
from ansible.plugins.action import ActionBase
from ansible.utils.boolean import boolean
from ansible.utils.hashing import checksum, checksum_s, md5, secure_hash
from ansible.utils.path import makedirs_safe
class ActionModule(ActionBase):
def run(self, tmp=None, task_vars=None):
''' handler for fetch operations '''
if task_vars is None:
task_vars = dict()
result = super(ActionModule, self).run(tmp, task_vars)
if self._play_context.check_mode:
result['skipped'] = True
result['msg'] = 'check mode not (yet) supported for this module'
return result
source = self._task.args.get('src', None)
dest = self._task.args.get('dest', None)
flat = boolean(self._task.args.get('flat'))
fail_on_missing = boolean(self._task.args.get('fail_on_missing'))
validate_checksum = boolean(self._task.args.get('validate_checksum', self._task.args.get('validate_md5')))
if 'validate_md5' in self._task.args and 'validate_checksum' in self._task.args:
result['failed'] = True
result['msg'] = "validate_checksum and validate_md5 cannot both be specified"
return result
if source is None or dest is None:
result['failed'] = True
result['msg'] = "src and dest are required"
return result
source = self._connection._shell.join_path(source)
source = self._remote_expand_user(source)
remote_checksum = None
if not self._play_context.become:
# calculate checksum for the remote file, don't bother if using become as slurp will be used
# Force remote_checksum to follow symlinks because fetch always follows symlinks
remote_checksum = self._remote_checksum(source, all_vars=task_vars, follow=True)
# use slurp if permissions are lacking or privilege escalation is needed
remote_data = None
if remote_checksum in ('1', '2', None):
slurpres = self._execute_module(module_name='slurp', module_args=dict(src=source), task_vars=task_vars, tmp=tmp)
if slurpres.get('failed'):
if not fail_on_missing and (slurpres.get('msg').startswith('file not found') or remote_checksum == '1'):
result['msg'] = "the remote file does not exist, not transferring, ignored"
result['file'] = source
result['changed'] = False
else:
result.update(slurpres)
return result
else:
if slurpres['encoding'] == 'base64':
remote_data = base64.b64decode(slurpres['content'])
if remote_data is not None:
remote_checksum = checksum_s(remote_data)
# the source path may have been expanded on the
# target system, so we compare it here and use the
# expanded version if it's different
remote_source = slurpres.get('source')
if remote_source and remote_source != source:
source = remote_source
# calculate the destination name
if os.path.sep not in self._connection._shell.join_path('a', ''):
source = self._connection._shell._unquote(source)
source_local = source.replace('\\', '/')
else:
source_local = source
dest = os.path.expanduser(dest)
if flat:
if dest.endswith(os.sep):
# if the path ends with "/", we'll use the source filename as the
# destination filename
base = os.path.basename(source_local)
dest = os.path.join(dest, base)
if not dest.startswith("/"):
# if dest does not start with "/", we'll assume a relative path
dest = self._loader.path_dwim(dest)
else:
# files are saved in dest dir, with a subdir for each host, then the filename
if 'inventory_hostname' in task_vars:
target_name = task_vars['inventory_hostname']
else:
target_name = self._play_context.remote_addr
dest = "%s/%s/%s" % (self._loader.path_dwim(dest), target_name, source_local)
dest = dest.replace("//","/")
if remote_checksum in ('0', '1', '2', '3', '4'):
# these don't fail because you may want to transfer a log file that
# possibly MAY exist but keep going to fetch other log files
if remote_checksum == '0':
result['msg'] = "unable to calculate the checksum of the remote file"
result['file'] = source
result['changed'] = False
elif remote_checksum == '1':
if fail_on_missing:
result['failed'] = True
result['msg'] = "the remote file does not exist"
result['file'] = source
else:
result['msg'] = "the remote file does not exist, not transferring, ignored"
result['file'] = source
result['changed'] = False
elif remote_checksum == '2':
result['msg'] = "no read permission on remote file, not transferring, ignored"
result['file'] = source
result['changed'] = False
elif remote_checksum == '3':
result['msg'] = "remote file is a directory, fetch cannot work on directories"
result['file'] = source
result['changed'] = False
elif remote_checksum == '4':
result['msg'] = "python isn't present on the system. Unable to compute checksum"
result['file'] = source
result['changed'] = False
return result
# calculate checksum for the local file
local_checksum = checksum(dest)
if remote_checksum != local_checksum:
# create the containing directories, if needed
makedirs_safe(os.path.dirname(dest))
# fetch the file and check for changes
if remote_data is None:
self._connection.fetch_file(source, dest)
else:
try:
f = open(to_bytes(dest, errors='surrogate_or_strict'), 'wb')
f.write(remote_data)
f.close()
except (IOError, OSError) as e:
raise AnsibleError("Failed to fetch the file: %s" % e)
new_checksum = secure_hash(dest)
# For backwards compatibility. We'll return None on FIPS enabled systems
try:
new_md5 = md5(dest)
except ValueError:
new_md5 = None
if validate_checksum and new_checksum != remote_checksum:
result.update(dict(failed=True, md5sum=new_md5,
msg="checksum mismatch", file=source, dest=dest, remote_md5sum=None,
checksum=new_checksum, remote_checksum=remote_checksum))
else:
result.update(dict(changed=True, md5sum=new_md5, dest=dest, remote_md5sum=None, checksum=new_checksum, remote_checksum=remote_checksum))
else:
# For backwards compatibility. We'll return None on FIPS enabled systems
try:
local_md5 = md5(dest)
except ValueError:
local_md5 = None
result.update(dict(changed=False, md5sum=local_md5, file=source, dest=dest, checksum=local_checksum))
return result
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