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#!/usr/bin/env python
from __future__ import absolute_import, division, print_function
__metaclass__ = type
import argparse
import gzip
import pathlib
import shutil
import subprocess
import sys
from urllib import request
from xml.etree import ElementTree
import yaml
BASE_REPO_URL = "https://packagecloud.io/sensu/stable/el/8/x86_64/"
FILENAME_TEMPLATE = "sensu-go-agent_{0}.{1}.{2}.{3}_en-US.{arch}.msi"
DOWNLOAD_URL_TEMPLATE = (
"https://s3-us-west-2.amazonaws.com/sensu.io/sensu-go/{0}.{1}.{2}/" +
FILENAME_TEMPLATE
)
MINIMAL_VERSION = (5, 20, 0)
class ArgParser(argparse.ArgumentParser):
"""An argument parser that displays help on error."""
def error(self, message):
sys.stderr.write("error: {0}\n".format(message))
self.print_help()
sys.exit(2)
def add_subparsers(self, **kwargs):
# Workaround for http://bugs.python.org/issue9253
subparsers = super(ArgParser, self).add_subparsers()
subparsers.required = True
subparsers.dest = "command"
return subparsers
def _fetch_available_versions():
available_versions = set()
response = request.urlopen(BASE_REPO_URL + "repodata/repomd.xml", timeout=30)
root = ElementTree.parse(response).getroot()
for data in root.iter("{http://linux.duke.edu/metadata/repo}data"):
if data.get("type") == "primary":
break
else:
return available_versions
location = next(data.iter("{http://linux.duke.edu/metadata/repo}location"))
path = location.attrib["href"]
response = request.urlopen(BASE_REPO_URL + path, timeout=30)
root = ElementTree.fromstring(gzip.decompress(response.read()))
for package in root.iter("{http://linux.duke.edu/metadata/common}package"):
name = next(package.iter("{http://linux.duke.edu/metadata/common}name"))
if name.text != "sensu-go-agent":
continue
version = next(package.iter("{http://linux.duke.edu/metadata/common}version"))
version_tuple = tuple(int(c) for c in version.get("ver").split("."))
if version_tuple < MINIMAL_VERSION:
continue
available_versions.add(version_tuple + (int(version.get("rel")), ))
return available_versions
def _load_versions_from_vars(vars):
return set(
(tuple(int(c) for c in item["version"].split(".")) + (item["build"],))
for item in vars["_msi_lookup"].values()
)
def _sync_versions(vars, available_versions, cache_dir):
new_vars = dict(vars, _msi_lookup={})
old_msis = vars["_msi_lookup"]
new_msis = new_vars["_msi_lookup"]
cache = pathlib.Path(cache_dir)
for version in sorted(available_versions):
version_str = ".".join(map(str, version[:3]))
if version_str in old_msis:
# Happy path: we already have this version sorted
new_msis[version_str] = old_msis[version_str]
continue
# Sad path: we need to download packages and extract product codes
product_codes = {}
for arch in ("x86", "x64"):
url = DOWNLOAD_URL_TEMPLATE.format(*version, arch=arch)
filename = FILENAME_TEMPLATE.format(*version, arch=arch)
file = cache / filename
if not file.is_file():
print("Downloading " + filename)
with open(file, "wb") as fp:
response = request.urlopen(url)
shutil.copyfileobj(response, fp)
else:
print("Reusing " + filename)
process = subprocess.run(
("msiinfo", "export", str(file), "Property"), capture_output=True,
check=True
)
for line in process.stdout.splitlines():
field, value = line.split(b"\t")
if field == b"ProductCode":
product_codes[arch] = value.decode("ascii")
new_msis[version_str] = dict(
version=version_str, build=version[-1], product_codes=product_codes
)
new_msis["latest"] = new_msis[version_str]
return new_vars
def _load_windows_vars_file(filename):
with open(filename, "r") as fd:
return yaml.safe_load(fd)
def _save_windows_vars_file(filename, vars):
with open(filename, "w") as fd:
yaml.safe_dump(vars, fd)
def _check(args):
vars_data = _load_windows_vars_file(args.vars)
current = _load_versions_from_vars(vars_data)
available = _fetch_available_versions()
missing = available - current
obsolete = current - available
if missing:
print("The following versions are missing: {0}".format(
", ".join(".".join(map(str, v)) for v in missing)
))
if obsolete:
print("The following versions are obsolete: {0}".format(
", ".join(".".join(map(str, v)) for v in obsolete)
))
return len(missing) + len(obsolete)
def _update(args):
vars_data = _load_windows_vars_file(args.vars)
current = _load_versions_from_vars(vars_data)
available = _fetch_available_versions()
if current == available:
return 0
new_vars_data = _sync_versions(vars_data, available, args.cache)
_save_windows_vars_file(args.vars, new_vars_data)
return 0
def main():
parser = ArgParser(
description="Windows agent version updater",
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
subparsers = parser.add_subparsers()
check = subparsers.add_parser("check", help="Check for version updates")
check.add_argument("vars", help="Variable file with Windows lookup table")
check.set_defaults(func=_check)
update = subparsers.add_parser("update", help="Update lookup table")
update.add_argument("vars", help="Variable file with Windows lookup table")
update.add_argument(
"--cache", help="Directory used for caching downloads", default="/tmp"
)
update.set_defaults(func=_update)
args = parser.parse_args()
return args.func(args)
if __name__ == "__main__":
sys.exit(main())
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