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# ==============================================================================
# Copyright 2011 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
from cfnbootstrap.construction_errors import ToolError
from cfnbootstrap.util import ProcessHelper, LoggingProcessHelper, interpret_boolean
import logging
import os.path
import subprocess
import json
log = logging.getLogger("cfn.init")
class CommandTool(object):
"""
Executes arbitrary commands
"""
def apply(self, action):
"""
Execute a set of commands, returning a list of commands that were executed.
Arguments:
action -- a dict of command to attributes, where attributes has keys of:
command: the command to run (a string or list)
cwd: working directory (a string)
env: a dictionary of environment variables
test: a commmand to run; if it returns zero, the command will run
ignoreErrors: if true, ignore errors
waitAfterCompletion: # of seconds to wait after completion (or "forever")
defaults: a command to run; the stdout will be used to provide defaults
Exceptions:
ToolError -- on expected failures
"""
commands_run = []
if not action:
log.debug("No commands specified")
return commands_run
for name in sorted(action.keys()):
log.debug(u"Running command %s", name)
attributes = action[name]
if "defaults" in attributes:
log.debug(u"Generating defaults for command %s", name)
defaultsResult = ProcessHelper(
attributes['defaults'], stderr=subprocess.PIPE).call()
log.debug(u"Defaults script for %s output: %s",
name, defaultsResult.stdout)
if defaultsResult.returncode:
log.error(u"Defaults script failed for %s: %s",
name, defaultsResult.stderr)
raise ToolError(
u"Defaults script for command %s failed" % name)
default_attrs = attributes
default_env = default_attrs.get("env", {})
attributes = json.loads(defaultsResult.stdout)
user_env = attributes.get("env", {})
user_env.update(default_env)
attributes.update(default_attrs)
attributes["env"] = user_env
if not "command" in attributes:
log.error(u"No command specified for %s", name)
raise ToolError(
u"%s does not specify the 'command' attribute, which is required" % name)
cwd = os.path.expanduser(
attributes["cwd"]) if "cwd" in attributes else None
env = attributes.get("env", None)
if "test" in attributes:
log.debug(u"Running test for command %s", name)
test = attributes["test"]
testResult = LoggingProcessHelper(
test, name=u'Test for Command %s' % name, env=env, cwd=cwd).call()
log.debug(u"Test command output: %s", testResult.stdout)
if testResult.returncode:
log.info(u"Test failed with code %s",
testResult.returncode)
continue
else:
log.debug(u"Test for command %s passed", name)
else:
log.debug(u"No test for command %s", name)
cmd_to_run = attributes["command"]
if "runas" in attributes:
if os.name == 'nt':
raise ToolError(
u'Command %s specified "runas", which is not supported on Windows' % name)
if isinstance(cmd_to_run, str):
cmd_to_run = u'su %s -c %s' % (
attributes['runas'], cmd_to_run)
else:
cmd_to_run = ['su', attributes['runas'], '-c'] + cmd_to_run
commandResult = LoggingProcessHelper(
cmd_to_run, name=u'Command %s' % name, env=env, cwd=cwd).call()
if commandResult.returncode:
log.error(u"Command %s (%s) failed",
name, attributes["command"])
log.debug(u"Command %s output: %s", name, commandResult.stdout)
if interpret_boolean(attributes.get("ignoreErrors")):
log.info("ignoreErrors set to true, continuing build")
commands_run.append(name)
else:
raise ToolError(u"Command %s failed" % name)
else:
log.info(u"Command %s succeeded", name)
log.debug(u"Command %s output: %s", name, commandResult.stdout)
commands_run.append(name)
return commands_run
@classmethod
def get_wait(cls, cmd_options):
wait = cmd_options.get('waitAfterCompletion',
60 if os.name == 'nt' else 0)
if isinstance(wait, str) and 'forever' == wait.lower():
return -1
return int(wait)