#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2017, Ryan Scott Brown <ryansb@redhat.com>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
---
module: terraform
short_description: Manages a Terraform deployment (and plans)
description:
- Provides support for deploying resources with Terraform and pulling
resource information back into Ansible.
options:
state:
choices: ['planned', 'present', 'absent']
description:
- Goal state of given stage/project
type: str
default: present
binary_path:
description:
- The path of a terraform binary to use, relative to the 'service_path'
unless you supply an absolute path.
type: path
project_path:
description:
- The path to the root of the Terraform directory with the
vars.tf/main.tf/etc to use.
type: path
required: true
workspace:
description:
- The terraform workspace to work with.
type: str
default: default
purge_workspace:
description:
- Only works with state = absent
- If true, the workspace will be deleted after the "terraform destroy" action.
- The 'default' workspace will not be deleted.
default: false
type: bool
plan_file:
description:
- The path to an existing Terraform plan file to apply. If this is not
specified, Ansible will build a new TF plan and execute it.
Note that this option is required if 'state' has the 'planned' value.
type: path
state_file:
description:
- The path to an existing Terraform state file to use when building plan.
If this is not specified, the default `terraform.tfstate` will be used.
- This option is ignored when plan is specified.
type: path
variables_files:
description:
- The path to a variables file for Terraform to fill into the TF
configurations. This can accept a list of paths to multiple variables files.
- Up until Ansible 2.9, this option was usable as I(variables_file).
type: list
elements: path
aliases: [ 'variables_file' ]
variables:
description:
- A group of key-values to override template variables or those in
variables files.
type: dict
targets:
description:
- A list of specific resources to target in this plan/application. The
resources selected here will also auto-include any dependencies.
type: list
elements: str
lock:
description:
- Enable statefile locking, if you use a service that accepts locks (such
as S3+DynamoDB) to store your statefile.
type: bool
default: true
lock_timeout:
description:
- How long to maintain the lock on the statefile, if you use a service
that accepts locks (such as S3+DynamoDB).
type: int
force_init:
description:
- To avoid duplicating infra, if a state file can't be found this will
force a `terraform init`. Generally, this should be turned off unless
you intend to provision an entirely new Terraform deployment.
default: false
type: bool
backend_config:
description:
- A group of key-values to provide at init stage to the -backend-config parameter.
type: dict
backend_config_files:
description:
- The path to a configuration file to provide at init state to the -backend-config parameter.
This can accept a list of paths to multiple configuration files.
type: list
elements: path
version_added: '0.2.0'
init_reconfigure:
description:
- Forces backend reconfiguration during init.
default: false
type: bool
version_added: '1.3.0'
notes:
- To just run a `terraform plan`, use check mode.
requirements: [ "terraform" ]
author: "Ryan Scott Brown (@ryansb)"
'''
EXAMPLES = """
- name: Basic deploy of a service
community.general.terraform:
project_path: '{{ project_dir }}'
state: present
- name: Define the backend configuration at init
community.general.terraform:
project_path: 'project/'
state: "{{ state }}"
force_init: true
backend_config:
region: "eu-west-1"
bucket: "some-bucket"
key: "random.tfstate"
- name: Define the backend configuration with one or more files at init
community.general.terraform:
project_path: 'project/'
state: "{{ state }}"
force_init: true
backend_config_files:
- /path/to/backend_config_file_1
- /path/to/backend_config_file_2
"""
RETURN = """
outputs:
type: complex
description: A dictionary of all the TF outputs by their assigned name. Use `.outputs.MyOutputName.value` to access the value.
returned: on success
sample: '{"bukkit_arn": {"sensitive": false, "type": "string", "value": "arn:aws:s3:::tf-test-bukkit"}'
contains:
sensitive:
type: bool
returned: always
description: Whether Terraform has marked this value as sensitive
type:
type: str
returned: always
description: The type of the value (string, int, etc)
value:
type: str
returned: always
description: The value of the output as interpolated by Terraform
stdout:
type: str
description: Full `terraform` command stdout, in case you want to display it or examine the event log
returned: always
sample: ''
command:
type: str
description: Full `terraform` command built by this module, in case you want to re-run the command outside the module or debug a problem.
returned: always
sample: terraform apply ...
"""
import os
import json
import tempfile
from ansible.module_utils.six.moves import shlex_quote
from ansible.module_utils.basic import AnsibleModule
DESTROY_ARGS = ('destroy', '-no-color', '-force')
APPLY_ARGS = ('apply', '-no-color', '-input=false', '-auto-approve=true')
module = None
def preflight_validation(bin_path, project_path, variables_args=None, plan_file=None):
if project_path in [None, ''] or '/' not in project_path:
module.fail_json(msg="Path for Terraform project can not be None or ''.")
if not os.path.exists(bin_path):
module.fail_json(msg="Path for Terraform binary '{0}' doesn't exist on this host - check the path and try again please.".format(bin_path))
if not os.path.isdir(project_path):
module.fail_json(msg="Path for Terraform project '{0}' doesn't exist on this host - check the path and try again please.".format(project_path))
rc, out, err = module.run_command([bin_path, 'validate'] + variables_args, cwd=project_path, use_unsafe_shell=True)
if rc != 0:
module.fail_json(msg="Failed to validate Terraform configuration files:\r\n{0}".format(err))
def _state_args(state_file):
if state_file and os.path.exists(state_file):
return ['-state', state_file]
if state_file and not os.path.exists(state_file):
module.fail_json(msg='Could not find state_file "{0}", check the path and try again.'.format(state_file))
return []
def init_plugins(bin_path, project_path, backend_config, backend_config_files, init_reconfigure):
command = [bin_path, 'init', '-input=false']
if backend_config:
for key, val in backend_config.items():
command.extend([
'-backend-config',
shlex_quote('{0}={1}'.format(key, val))
])
if backend_config_files:
for f in backend_config_files:
command.extend(['-backend-config', f])
if init_reconfigure:
command.extend('-reconfigure')
rc, out, err = module.run_command(command, cwd=project_path)
if rc != 0:
module.fail_json(msg="Failed to initialize Terraform modules:\r\n{0}".format(err))
def get_workspace_context(bin_path, project_path):
workspace_ctx = {"current": "default", "all": []}
command = [bin_path, 'workspace', 'list', '-no-color']
rc, out, err = module.run_command(command, cwd=project_path)
if rc != 0:
module.warn("Failed to list Terraform workspaces:\r\n{0}".format(err))
for item in out.split('\n'):
stripped_item = item.strip()
if not stripped_item:
continue
elif stripped_item.startswith('* '):
workspace_ctx["current"] = stripped_item.replace('* ', '')
else:
workspace_ctx["all"].append(stripped_item)
return workspace_ctx
def _workspace_cmd(bin_path, project_path, action, workspace):
command = [bin_path, 'workspace', action, workspace, '-no-color']
rc, out, err = module.run_command(command, cwd=project_path)
if rc != 0:
module.fail_json(msg="Failed to {0} workspace:\r\n{1}".format(action, err))
return rc, out, err
def create_workspace(bin_path, project_path, workspace):
_workspace_cmd(bin_path, project_path, 'new', workspace)
def select_workspace(bin_path, project_path, workspace):
_workspace_cmd(bin_path, project_path, 'select', workspace)
def remove_workspace(bin_path, project_path, workspace):
_workspace_cmd(bin_path, project_path, 'delete', workspace)
def build_plan(command, project_path, variables_args, state_file, targets, state, plan_path=None):
if plan_path is None:
f, plan_path = tempfile.mkstemp(suffix='.tfplan')
plan_command = [command[0], 'plan', '-input=false', '-no-color', '-detailed-exitcode', '-out', plan_path]
for t in (module.params.get('targets') or []):
plan_command.extend(['-target', t])
plan_command.extend(_state_args(state_file))
rc, out, err = module.run_command(plan_command + variables_args, cwd=project_path, use_unsafe_shell=True)
if rc == 0:
# no changes
return plan_path, False, out, err, plan_command if state == 'planned' else command
elif rc == 1:
# failure to plan
module.fail_json(msg='Terraform plan could not be created\r\nSTDOUT: {0}\r\n\r\nSTDERR: {1}'.format(out, err))
elif rc == 2:
# changes, but successful
return plan_path, True, out, err, plan_command if state == 'planned' else command
module.fail_json(msg='Terraform plan failed with unexpected exit code {0}. \r\nSTDOUT: {1}\r\n\r\nSTDERR: {2}'.format(rc, out, err))
def main():
global module
module = AnsibleModule(
argument_spec=dict(
project_path=dict(required=True, type='path'),
binary_path=dict(type='path'),
workspace=dict(required=False, type='str', default='default'),
purge_workspace=dict(type='bool', default=False),
state=dict(default='present', choices=['present', 'absent', 'planned']),
variables=dict(type='dict'),
variables_files=dict(aliases=['variables_file'], type='list', elements='path', default=None),
plan_file=dict(type='path'),
state_file=dict(type='path'),
targets=dict(type='list', elements='str', default=[]),
lock=dict(type='bool', default=True),
lock_timeout=dict(type='int',),
force_init=dict(type='bool', default=False),
backend_config=dict(type='dict', default=None),
backend_config_files=dict(type='list', elements='path', default=None),
init_reconfigure=dict(required=False, type='bool', default=False),
),
required_if=[('state', 'planned', ['plan_file'])],
supports_check_mode=True,
)
project_path = module.params.get('project_path')
bin_path = module.params.get('binary_path')
workspace = module.params.get('workspace')
purge_workspace = module.params.get('purge_workspace')
state = module.params.get('state')
variables = module.params.get('variables') or {}
variables_files = module.params.get('variables_files')
plan_file = module.params.get('plan_file')
state_file = module.params.get('state_file')
force_init = module.params.get('force_init')
backend_config = module.params.get('backend_config')
backend_config_files = module.params.get('backend_config_files')
init_reconfigure = module.params.get('init_reconfigure')
if bin_path is not None:
command = [bin_path]
else:
command = [module.get_bin_path('terraform', required=True)]
if force_init:
init_plugins(command[0], project_path, backend_config, backend_config_files, init_reconfigure)
workspace_ctx = get_workspace_context(command[0], project_path)
if workspace_ctx["current"] != workspace:
if workspace not in workspace_ctx["all"]:
create_workspace(command[0], project_path, workspace)
else:
select_workspace(command[0], project_path, workspace)
if state == 'present':
command.extend(APPLY_ARGS)
elif state == 'absent':
command.extend(DESTROY_ARGS)
variables_args = []
for k, v in variables.items():
variables_args.extend([
'-var',
'{0}={1}'.format(k, v)
])
if variables_files:
for f in variables_files:
variables_args.extend(['-var-file', f])
preflight_validation(command[0], project_path, variables_args)
if module.params.get('lock') is not None:
if module.params.get('lock'):
command.append('-lock=true')
else:
command.append('-lock=false')
if module.params.get('lock_timeout') is not None:
command.append('-lock-timeout=%ds' % module.params.get('lock_timeout'))
for t in (module.params.get('targets') or []):
command.extend(['-target', t])
# we aren't sure if this plan will result in changes, so assume yes
needs_application, changed = True, False
out, err = '', ''
if state == 'absent':
command.extend(variables_args)
elif state == 'present' and plan_file:
if any([os.path.isfile(project_path + "/" + plan_file), os.path.isfile(plan_file)]):
command.append(plan_file)
else:
module.fail_json(msg='Could not find plan_file "{0}", check the path and try again.'.format(plan_file))
else:
plan_file, needs_application, out, err, command = build_plan(command, project_path, variables_args, state_file,
module.params.get('targets'), state, plan_file)
command.append(plan_file)
if needs_application and not module.check_mode and not state == 'planned':
rc, out, err = module.run_command(command, cwd=project_path)
# checks out to decide if changes were made during execution
if ' 0 added, 0 changed' not in out and not state == "absent" or ' 0 destroyed' not in out:
changed = True
if rc != 0:
module.fail_json(
msg="Failure when executing Terraform command. Exited {0}.\nstdout: {1}\nstderr: {2}".format(rc, out, err),
command=' '.join(command)
)
outputs_command = [command[0], 'output', '-no-color', '-json'] + _state_args(state_file)
rc, outputs_text, outputs_err = module.run_command(outputs_command, cwd=project_path)
if rc == 1:
module.warn("Could not get Terraform outputs. This usually means none have been defined.\nstdout: {0}\nstderr: {1}".format(outputs_text, outputs_err))
outputs = {}
elif rc != 0:
module.fail_json(
msg="Failure when getting Terraform outputs. "
"Exited {0}.\nstdout: {1}\nstderr: {2}".format(rc, outputs_text, outputs_err),
command=' '.join(outputs_command))
else:
outputs = json.loads(outputs_text)
# Restore the Terraform workspace found when running the module
if workspace_ctx["current"] != workspace:
select_workspace(command[0], project_path, workspace_ctx["current"])
if state == 'absent' and workspace != 'default' and purge_workspace is True:
remove_workspace(command[0], project_path, workspace)
module.exit_json(changed=changed, state=state, workspace=workspace, outputs=outputs, stdout=out, stderr=err, command=' '.join(command))
if __name__ == '__main__':
main()