mirror of
https://github.com/zulip/zulip.git
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fb80ecd9c3
Filling caches needs to happen close to when the server is restarted, as the gap opens us up to race conditions with user modifications. If there are migrations, however, it must happen within the critical period after the migrations are applied. Move the call to fill the caches to within the `shutdown_server` function, so that we push it as close to the server shutdown as possible.
547 lines
21 KiB
Python
Executable File
547 lines
21 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# This script contains the actual logic for upgrading from an old
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# version of Zulip to the new version. upgrade-zulip-stage-2 is
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# always run from the new version of Zulip, so any bug fixes take
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# effect on the very next upgrade.
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import argparse
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import glob
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import hashlib
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import logging
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import os
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import re
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import shutil
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import subprocess
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import sys
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import time
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from typing import Literal, NoReturn, Optional
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os.environ["PYTHONUNBUFFERED"] = "y"
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# Force a known locale. Some packages on PyPI fail to install in some locales.
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os.environ["LC_ALL"] = "C.UTF-8"
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os.environ["LANG"] = "C.UTF-8"
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os.environ["LANGUAGE"] = "C.UTF-8"
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sys.path.append(os.path.join(os.path.dirname(__file__), "..", ".."))
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from scripts.lib.zulip_tools import (
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DEPLOYMENTS_DIR,
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assert_running_as_root,
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get_config,
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get_config_bool,
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get_config_file,
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get_zulip_pwent,
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listening_publicly,
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parse_os_release,
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parse_version_from,
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run_psql_as_postgres,
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start_arg_parser,
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su_to_zulip,
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)
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assert_running_as_root()
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# Set a known, reliable PATH
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os.environ["PATH"] = "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
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logging.Formatter.converter = time.gmtime
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logging.basicConfig(format="%(asctime)s upgrade-zulip-stage-2: %(message)s", level=logging.INFO)
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def error_desupported_os(vendor: str, os_version: str) -> NoReturn:
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# Link to documentation for how to correctly upgrade the OS.
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logging.critical("Unsupported platform: %s %s", vendor, os_version)
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logging.info(
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"Sorry! The support for your OS has been discontinued.\n"
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"Please upgrade your OS to a supported release first.\n"
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"See https://zulip.readthedocs.io/en/latest/production/"
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"upgrade.html#upgrading-the-operating-system"
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)
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sys.exit(1)
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# Do not upgrade on unsupported OS versions.
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UNSUPPORTED_DISTROS = [
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("ubuntu", "14.04"),
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("ubuntu", "16.04"),
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("ubuntu", "18.04"),
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("debian", "9"),
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("debian", "10"),
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]
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distro_info = parse_os_release()
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vendor = distro_info["ID"]
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os_version = distro_info["VERSION_ID"]
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if (vendor, os_version) in UNSUPPORTED_DISTROS:
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error_desupported_os(vendor, os_version)
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# make sure we have appropriate file permissions
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os.umask(0o22)
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restart_parser = start_arg_parser(action="restart", add_help=False)
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parser = argparse.ArgumentParser(parents=[restart_parser])
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parser.add_argument("deploy_path", metavar="deploy_path", help="Path to deployment directory")
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parser.add_argument(
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"--skip-restart",
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action="store_true",
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help="Configure, but do not restart into, the new version; aborts if any system-wide changes would happen.",
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)
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parser.add_argument("--skip-puppet", action="store_true", help="Skip doing puppet/apt upgrades.")
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parser.add_argument("--skip-migrations", action="store_true", help="Skip doing migrations.")
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parser.add_argument(
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"--skip-downgrade-check",
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action="store_true",
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help="Skip the safety check to prevent database downgrades.",
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)
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parser.add_argument(
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"--from-git", action="store_true", help="Upgrading from git, so run update-prod-static."
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)
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parser.add_argument(
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"--ignore-static-assets",
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action="store_true",
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help="Do not attempt to copy/manage static assets.",
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)
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parser.add_argument(
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"--skip-purge-old-deployments", action="store_true", help="Skip purging old deployments."
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)
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parser.add_argument(
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"--audit-fts-indexes", action="store_true", help="Audit and fix full text search indexes."
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)
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args = parser.parse_args()
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# There are two reasons we might want to do a "minimal change" which
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# asserts puppet/database are unchanged: if we're setting up for a
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# post-upgrade manual restart (--skip-restart), or if we're only
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# restarting part of the system (--skip-tornado).
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minimal_change = args.skip_restart or args.skip_tornado
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if args.skip_restart and args.skip_tornado:
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logging.warning("Ignored --skip-tornado; all upgrades with --skip-restart skip all restarts.")
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args.skip_tornado = False
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if minimal_change:
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if args.skip_restart:
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flagname = "--skip-restart"
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else:
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flagname = "--skip-tornado"
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if args.less_graceful:
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logging.warning("Ignored --less-graceful; %s is always graceful.", flagname)
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args.less_graceful = False
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if args.skip_migrations:
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logging.warning(
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"Ignored --skip-migrations; all upgrades with %s assert no migrations.", flagname
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)
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args.skip_migrations = False
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if args.skip_puppet:
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logging.warning(
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"Ignored --skip-puppet; all upgrades with %s assert no puppet changes.", flagname
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)
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args.skip_puppet = False
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if not args.skip_puppet and args.less_graceful:
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logging.warning("Ignored --less-graceful; all upgrades without --skip-puppet are ungraceful.")
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deploy_path = args.deploy_path
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os.chdir(deploy_path)
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config_file = get_config_file()
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IS_SERVER_UP = True
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HAS_FILLED_CACHES = False
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if args.from_git:
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logging.info("Caching Zulip Git version...")
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subprocess.check_call(["./tools/cache-zulip-git-version"], preexec_fn=su_to_zulip)
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from version import ZULIP_MERGE_BASE as NEW_ZULIP_MERGE_BASE
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from version import ZULIP_VERSION as NEW_ZULIP_VERSION
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old_version = parse_version_from(DEPLOYMENTS_DIR + "/current")
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logging.info("Upgrading from %s to %s, in %s", old_version, NEW_ZULIP_VERSION, deploy_path)
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old_merge_base = (
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parse_version_from(DEPLOYMENTS_DIR + "/current", merge_base=True) if args.from_git else ""
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)
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# Check if rabbitmq port 25672 is listening on anything except 127.0.0.1
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rabbitmq_dist_listen = listening_publicly(25672)
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# Check the erlang magic cookie size
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cookie_size: Optional[int] = None
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if os.path.exists("/var/lib/rabbitmq/.erlang.cookie"):
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with open("/var/lib/rabbitmq/.erlang.cookie") as cookie_fh:
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cookie_size = len(cookie_fh.readline())
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else:
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logging.info("No RabbitMQ erlang cookie found, not auditing RabbitMQ security.")
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if (minimal_change or args.skip_puppet) and rabbitmq_dist_listen:
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logging.error(
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"RabbitMQ is publicly-accessible on %s; this is a security vulnerability!",
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", ".join(rabbitmq_dist_listen),
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)
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issue = "issue"
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if cookie_size is not None and cookie_size == 20:
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# See the below comment -- this is used as a lightweight
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# signal for a cookie made with Erlang's bad randomizer.
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logging.error(
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"RabbitMQ erlang cookie is insecure; this is a critical security vulnerability!"
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)
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issue = "issues"
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logging.error(
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"To fix the above security %s, re-run the upgrade without --skip-puppet "
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"(which may be set in /etc/zulip/zulip.conf), in order to restart the "
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"necessary services. Running zulip-puppet-apply by itself is not sufficient.",
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issue,
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)
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sys.exit(1)
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migrations_needed = False
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def fill_memcached_caches() -> None:
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global HAS_FILLED_CACHES
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if HAS_FILLED_CACHES or migrations_needed:
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return
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subprocess.check_call(
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["./manage.py", "fill_memcached_caches", "--skip-checks"], preexec_fn=su_to_zulip
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)
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HAS_FILLED_CACHES = True
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def shutdown_server(fill_caches: bool = True) -> None:
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global IS_SERVER_UP
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if minimal_change:
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logging.info("Upgrade would require shutting down Zulip -- aborting!")
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sys.exit(1)
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if fill_caches:
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fill_memcached_caches()
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if IS_SERVER_UP:
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logging.info("Stopping Zulip...")
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subprocess.check_call(["./scripts/stop-server"], preexec_fn=su_to_zulip)
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IS_SERVER_UP = False
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if glob.glob("/usr/share/postgresql/*/extension/tsearch_extras.control"):
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# Remove legacy tsearch_extras package references
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run_psql_as_postgres(
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config_file=config_file,
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sql_query="DROP EXTENSION IF EXISTS tsearch_extras;",
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)
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subprocess.check_call(["apt-get", "remove", "-y", "postgresql-*-tsearch-extras"])
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if not (minimal_change or args.skip_puppet):
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# We need to temporarily hold pgroonga, if installed -- upgrading
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# it without running the appropriate upgrade SQL can cause
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# PostgreSQL to crash
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if get_config_bool(config_file, "machine", "pgroonga"):
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subprocess.check_call(["apt-mark", "hold", "postgresql-*-pgdg-pgroonga"])
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logging.info("Upgrading system packages...")
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subprocess.check_call(["apt-get", "update"])
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subprocess.check_call(["apt-get", "-y", "--with-new-pkgs", "upgrade"])
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if get_config_bool(config_file, "machine", "pgroonga"):
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subprocess.check_call(["apt-mark", "unhold", "postgresql-*-pgdg-pgroonga"])
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# To bootstrap zulip-puppet-apply, we need to install the system yaml
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# package; new installs get this, but old installs may not have it.
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if not os.path.exists("/usr/share/doc/python3-yaml"):
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logging.info("Installing system YAML package, for puppet...")
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subprocess.check_call(["apt-get", "install", "python3-yaml"])
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if not os.path.exists(os.path.join(deploy_path, "zproject/prod_settings.py")):
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# This is normally done in unpack-zulip, but for upgrading from
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# zulip<1.4.0, we need to do it. See discussion in commit 586b23637.
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os.symlink("/etc/zulip/settings.py", os.path.join(deploy_path, "zproject/prod_settings.py"))
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# Now we should have an environment set up where we can run our tools;
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# first, creating the production venv.
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subprocess.check_call(
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[os.path.join(deploy_path, "scripts", "lib", "create-production-venv"), deploy_path]
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)
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# Check to make sure that this upgrade is not actually a database
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# downgrade.
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if not args.skip_downgrade_check:
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subprocess.check_call(
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[os.path.join(deploy_path, "scripts", "lib", "check-database-compatibility")],
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preexec_fn=su_to_zulip,
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)
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# Make sure the right version of node is installed
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subprocess.check_call([os.path.join(deploy_path, "scripts", "lib", "install-node")])
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# Generate any new secrets that were added in the new version required.
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# TODO: Do caching to only run this when it has changed.
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subprocess.check_call(
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[os.path.join(deploy_path, "scripts", "setup", "generate_secrets.py"), "--production"]
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)
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# Adjust Puppet class names for the manifest renames in the 4.0 release
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class_renames = {
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"zulip::app_frontend": "zulip::profile::app_frontend",
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"zulip::dockervoyager": "zulip::profile::docker",
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"zulip::memcached": "zulip::profile::memcached",
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"zulip::postgres_appdb_tuned": "zulip::profile::postgresql",
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"zulip::postgres_backups": "zulip::postgresql_backups",
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"zulip::rabbit": "zulip::profile::rabbitmq",
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"zulip::voyager": "zulip::profile::standalone",
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}
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classes = re.split(r"\s*,\s*", get_config(config_file, "machine", "puppet_classes"))
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new_classes = [class_renames.get(c, c) for c in classes if c != "zulip::base"]
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if classes != new_classes:
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if minimal_change:
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logging.error("Would need to adjust puppet classes -- aborting!")
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sys.exit(1)
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logging.info("Adjusting Puppet classes for renames...")
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subprocess.check_call(
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[
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"crudini",
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"--set",
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"/etc/zulip/zulip.conf",
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"machine",
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"puppet_classes",
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", ".join(new_classes),
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]
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)
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# Unpleasant migration: Remove any legacy deployed copies of
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# images-google-64 from before we renamed that emojiset to
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# "googleblob":
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emoji_path = "/home/zulip/prod-static/generated/emoji/images-google-64/1f32d.png"
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if os.path.exists(emoji_path):
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with open(emoji_path, "rb") as f:
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emoji_data = f.read()
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emoji_sha = hashlib.sha1(emoji_data).hexdigest()
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if emoji_sha == "47033121dc20b376e0f86f4916969872ad22a293":
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if minimal_change:
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logging.error("Would need to delete images-google-64 -- aborting!")
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sys.exit(1)
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shutil.rmtree("/home/zulip/prod-static/generated/emoji/images-google-64")
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# And then, building/installing the static assets.
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if args.ignore_static_assets:
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# For the OS version upgrade use case, the static assets are
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# already in place, and we don't need to do anything. Further,
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# neither of the options below will work for all installations,
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# because if we installed from Git, `prod-static/serve` may be
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# empty so we can't do the non-Git thing, whereas if we installed
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# from a tarball, we won't have a `tools/` directory and thus
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# cannot run `tools/update-prod-static`.
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pass
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elif args.from_git:
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# Because `upgrade-zulip-from-git` needs to build static assets, it
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# is at risk of being OOM killed on systems with limited free RAM.
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mem_bytes = os.sysconf("SC_PAGE_SIZE") * os.sysconf("SC_PHYS_PAGES")
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mem_gib = mem_bytes / (1024.0**3) # e.g. 3.74
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# Ideally, we'd have 2 thresholds here, depending on whether the
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# system is running queue workers multithreaded or multiprocess.
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# See puppet/zulip/manifests/app_frontend_base.pp for background.
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if mem_gib < 4.2:
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logging.info("Shutting down server to ensure sufficient free RAM for webpack.")
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shutdown_server(fill_caches=False)
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# Note: The fact that this is before we apply Puppet changes means
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# that we don't support adding new Puppet dependencies of
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# update-prod-static with the Git upgrade process. But it'll fail
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# safely; this seems like a worthwhile tradeoff to minimize downtime.
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logging.info("Building static assets...")
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try:
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subprocess.check_call(["./tools/update-prod-static"], preexec_fn=su_to_zulip)
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except subprocess.CalledProcessError:
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logging.error("Failed to build static assets.")
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if IS_SERVER_UP:
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logging.error("Usually the cause is insufficient free RAM to run webpack.")
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logging.error("Try stopping the Zulip server (scripts/stop-server) and trying again.")
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sys.exit(1)
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else:
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# Since this doesn't do any actual work, it's likely safe to have
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# this run before we apply Puppet changes (saving a bit of downtime).
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logging.info("Installing static assets...")
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subprocess.check_call(
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["cp", "-rT", os.path.join(deploy_path, "prod-static/serve"), "/home/zulip/prod-static"],
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preexec_fn=su_to_zulip,
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)
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# Perform system checks -- including database checks, so we don't need
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# to do them when we do migrations, below.
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if not args.skip_checks:
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subprocess.check_call(["./manage.py", "check", "--database", "default"], preexec_fn=su_to_zulip)
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# Our next optimization is to check whether any migrations are needed
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# before we start the critical section of the restart. This saves
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# about 1s of downtime in a no-op upgrade. We omit this check if we
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# already stopped the server above, due to low memory.
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if not IS_SERVER_UP:
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migrations_needed = True
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elif not args.skip_migrations:
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logging.info("Checking for needed migrations")
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migrations_output = subprocess.check_output(
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["./manage.py", "showmigrations", "--skip-checks"], preexec_fn=su_to_zulip, text=True
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)
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for ln in migrations_output.split("\n"):
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line_str = ln.strip()
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if line_str.startswith("[ ]"):
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migrations_needed = True
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if minimal_change and migrations_needed:
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logging.error("Would need to apply migrations -- aborting!")
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sys.exit(1)
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# If we're skipping tornado restarts, we need to ensure we keep the
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# same cache prefix as we currently have.
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if args.skip_tornado:
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shutil.copyfile("../current/var/remote_cache_prefix", "./var/remote_cache_prefix")
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# Install hooks before we check for puppet changes, so we skip an
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# unnecessary stop/start cycle if hook changes are the only ones.
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logging.info("Installing hooks")
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subprocess.check_call(
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["./scripts/zulip-puppet-apply", "--tags", "hooks", "--force"],
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)
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# If we are planning on running puppet, we can pre-run it in --noop
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# mode and see if it will actually make any changes; if not, we can
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# skip it during the upgrade. We omit this check if the server is
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# already stopped, since it's not better than just pressing on.
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has_puppet_changes = True
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if not args.skip_puppet and IS_SERVER_UP:
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logging.info("Pre-checking for puppet changes...")
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try_puppet = subprocess.run(
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["./scripts/zulip-puppet-apply", "--noop", "--force"],
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stdout=subprocess.DEVNULL,
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check=False,
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)
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if try_puppet.returncode == 0:
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if minimal_change:
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logging.info("Verified no Puppet changes are necessary.")
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else:
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logging.info("No puppet changes found, skipping!")
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args.skip_puppet = True
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has_puppet_changes = False
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elif try_puppet.returncode == 2:
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logging.error("Puppet error -- aborting!")
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sys.exit(1)
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elif minimal_change:
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logging.error("Would need to apply puppet changes -- aborting!")
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sys.exit(1)
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def run_hooks(kind: Literal["pre-deploy", "post-deploy"]) -> None:
|
|
# Updates to the above literal to add a new hook type should
|
|
# adjust puppet's `app_frontend_base.pp` as well.
|
|
path = f"/etc/zulip/hooks/{kind}.d"
|
|
if not os.path.exists(path):
|
|
return
|
|
# Pass in, via environment variables, the old/new "version
|
|
# string" (which is a `git describe` output)
|
|
env = os.environ.copy()
|
|
env["ZULIP_OLD_VERSION"] = old_version
|
|
env["ZULIP_NEW_VERSION"] = NEW_ZULIP_VERSION
|
|
|
|
# preexec_fn=su_to_zulip normally handles this, but our explicit
|
|
# env overrides that
|
|
env["HOME"] = get_zulip_pwent().pw_dir
|
|
|
|
def resolve_version_string(version: str) -> str:
|
|
return subprocess.check_output(
|
|
["git", "rev-parse", version], cwd=deploy_path, preexec_fn=su_to_zulip, text=True
|
|
).strip()
|
|
|
|
if args.from_git:
|
|
# If we have a git repo, we also resolve those `git describe`
|
|
# values to full commit hashes, as well as provide the
|
|
# merge-base of the old/new commits with mainline.
|
|
env["ZULIP_OLD_COMMIT"] = resolve_version_string(old_version)
|
|
env["ZULIP_NEW_COMMIT"] = resolve_version_string(NEW_ZULIP_VERSION)
|
|
env["ZULIP_OLD_MERGE_BASE_COMMIT"] = resolve_version_string(old_merge_base)
|
|
env["ZULIP_NEW_MERGE_BASE_COMMIT"] = resolve_version_string(NEW_ZULIP_MERGE_BASE)
|
|
for script_name in sorted(f for f in os.listdir(path) if f.endswith(".hook")):
|
|
subprocess.check_call(
|
|
[os.path.join(path, script_name)],
|
|
cwd=deploy_path,
|
|
preexec_fn=su_to_zulip,
|
|
env=env,
|
|
)
|
|
|
|
|
|
if args.skip_restart:
|
|
logging.info("Successfully configured in %s!", deploy_path)
|
|
else:
|
|
# NOTE: Here begins the most likely critical period, where we may be
|
|
# shutting down the server; we should strive to minimize the number of
|
|
# steps that happen between here and the "Restarting Zulip" line
|
|
# below.
|
|
|
|
run_hooks("pre-deploy")
|
|
|
|
if rabbitmq_dist_listen:
|
|
shutdown_server()
|
|
logging.info("Shutting down rabbitmq to adjust its ports...")
|
|
subprocess.check_call(["/usr/sbin/service", "rabbitmq-server", "stop"])
|
|
|
|
if cookie_size is not None and cookie_size == 20:
|
|
# Checking for a 20-character cookie is used as a signal that it
|
|
# was generated by Erlang's insecure randomizer, which only
|
|
# provides between 20 and 36 bits of entropy; were it 20
|
|
# characters long by a good randomizer, it would be 96 bits and
|
|
# more than sufficient. We generate, using good randomness, a
|
|
# 255-character cookie, the max allowed length.
|
|
shutdown_server()
|
|
logging.info("Generating a secure erlang cookie...")
|
|
subprocess.check_call(["./scripts/setup/generate-rabbitmq-cookie"])
|
|
|
|
if not args.skip_puppet:
|
|
# Puppet may adjust random services; to minimize risk of issues
|
|
# due to inconsistent state, we shut down the server first.
|
|
shutdown_server()
|
|
logging.info("Applying Puppet changes...")
|
|
subprocess.check_call(["./scripts/zulip-puppet-apply", "--force"])
|
|
subprocess.check_call(["apt-get", "-y", "--with-new-pkgs", "upgrade"])
|
|
# Puppet may have reloaded supervisor, and in so doing started
|
|
# services; mark as potentially needing to stop the server.
|
|
IS_SERVER_UP = True
|
|
|
|
if migrations_needed:
|
|
# Database migrations assume that they run on a database in
|
|
# quiesced state.
|
|
shutdown_server()
|
|
logging.info("Applying database migrations...")
|
|
subprocess.check_call(
|
|
["./manage.py", "migrate", "--noinput", "--skip-checks"], preexec_fn=su_to_zulip
|
|
)
|
|
|
|
logging.info("Restarting Zulip...")
|
|
start_args = ["--skip-checks"]
|
|
if not HAS_FILLED_CACHES:
|
|
start_args.append("--fill-cache")
|
|
if IS_SERVER_UP:
|
|
if args.skip_tornado:
|
|
start_args.append("--skip-tornado")
|
|
if args.less_graceful:
|
|
start_args.append("--less-graceful")
|
|
subprocess.check_call(["./scripts/restart-server", *start_args], preexec_fn=su_to_zulip)
|
|
else:
|
|
subprocess.check_call(["./scripts/start-server", *start_args], preexec_fn=su_to_zulip)
|
|
|
|
logging.info("Upgrade complete!")
|
|
|
|
run_hooks("post-deploy")
|
|
|
|
if args.audit_fts_indexes:
|
|
logging.info("Correcting full-text search indexes for updated dictionary files")
|
|
logging.info("This may take a while but the server should work while it runs.")
|
|
subprocess.check_call(
|
|
["./manage.py", "audit_fts_indexes", "--skip-checks"], preexec_fn=su_to_zulip
|
|
)
|
|
|
|
if not args.skip_purge_old_deployments:
|
|
logging.info("Purging old deployments...")
|
|
subprocess.check_call(["./scripts/purge-old-deployments"])
|
|
else:
|
|
logging.info("Skipping purging old deployments.")
|
|
|
|
if args.skip_puppet and has_puppet_changes:
|
|
logging.info("Showing un-applied Puppet changes:")
|
|
subprocess.check_call(["./scripts/zulip-puppet-apply", "--noop", "--show_diff"])
|