genconfig
No OneTemporary
Actions

Size

1 KB

Referenced Files

None

Subscribers

None

genconfig
View Options

	#!/usr/bin/env python

	#
	# Reads a template file, and substitutes %%expressions%% by values.
	# The credentials are fetched from a credentials remote server through SSH.
	# The configuration output file is printed to stdout
	#
	# Usage: ./genconfig <template file> > <config file>
	#

	import os
	import re
	import subprocess
	import sys

	#
	# Helper functions
	#

	def execute_and_display (command):
	"""Executes a command and return the result as a trimmed string"""
	proc = subprocess.Popen(command, stdout=subprocess.PIPE)
	(out, err) = proc.communicate()
	return out.strip()

	#
	# Creditentials functions
	#

	def get_ssh_server ():
	"""Gets the SSH server to query credentials"""
	return os.getenv('SSH_SERVER', "localhost")

	def get_credential (credential_id, credential_property):
	"""Gets the relevant property of the specified credential"""
	return execute_and_display([
	"ssh",
	get_ssh_server(),
	"getcredentials",
	credential_id,
	credential_property
	])

	#
	# Templates functions
	#

	def print_config_from_template (filename):
	"""Prints filename with config parameters substitution"""
	with open(filename) as f:
	for line in f:
	print substitute_parameters(line),

	def substitute_parameters (text):
	"""Substitutes parameters in text"""
	pattern = re.compile(r"%%(.*?)%%")
	return re.sub(pattern, substitute_parameter, text)

	def substitute_parameter (matchObj):
	"""
	Callback for the substitute regexp replacement method.

	Substitutes the specified parameter
	"""
	parameter = matchObj.group(1).split(".")

	if parameter[0] == "credentials":
	return get_credential(parameter[1], parameter[2])

	sys.stderr.write("Unknown parameter: " + parameter[0])
	return ""

	#
	# Procedural code
	#

	if len(sys.argv) != 2:
	print "Usage: genconfig <template file>"
	sys.exit(1)

	print_config_from_template(sys.argv[1])

File Metadata

Mime Type: text/x-python
Expires: Thu, Apr 9, 02:03 (1 d, 3 h)
Storage Engine: blob
Storage Format: Raw Data
Storage Handle: 3603745
Default Alt Text: genconfig (1 KB)

genconfigNo OneTemporaryActions

genconfigView Options

File Metadata

Event Timeline

genconfig
No OneTemporary
Actions

genconfig
View Options