check-postgresql-dependencies.py
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check-postgresql-dependencies.py
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	#!/usr/bin/env python3

	# -------------------------------------------------------------
	# Monitoring :: PostgreSQL :: Dynamic dependencies
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Description: Checks if the PostgreSQL port needs to be rebuild
	# if dependencies have been upgraded.
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	import distutils.spawn
	import lddcollect
	import sys


	# -------------------------------------------------------------
	# Dependencies
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def get_libs_real_paths(process):
	dependencies = lddcollect.lddtree(process)

	return {lib: lib_info["realpath"] for lib, lib_info in dependencies["libs"].items()}


	def get_missing_libs(process):
	libs = get_libs_real_paths(process)

	return [lib for lib, path in libs.items() if path is None]


	# -------------------------------------------------------------
	# PostgreSQL locator
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def find_postgres():
	return distutils.spawn.find_executable("postgres")


	# -------------------------------------------------------------
	# Application entry point
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


	def run():
	process = find_postgres()
	if process is None:
	print("UNKNOWN: can't find expected postgres process")
	sys.exit(3)

	missing_libs = get_missing_libs(process)
	if not missing_libs:
	print("OK")
	sys.exit(0)

	libs = " / ".join(missing_libs)
	print(
	f"ERROR: {libs} are missing, PostgreSQL port MUST be rebuilt as soon as possible."
	)
	sys.exit(2)


	if __name__ == "__main__":
	run()

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