zulip/scripts/clean-venv-cache

#!/usr/bin/env python3
import argparse
import os
import sys

if False:
    from typing import Set, Text

ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.append(ZULIP_PATH)
from scripts.lib.hash_reqs import expand_reqs, hash_deps
from scripts.lib.zulip_tools import GENERIC_CACHE_SCRIPT_PARSER, \
    get_caches_to_be_purged, get_environment, get_recent_deployments, \
    purge_unused_caches

ENV = get_environment()
VENV_CACHE_DIR = '/srv/zulip-venv-cache'
if ENV == "travis":
    VENV_CACHE_DIR = os.path.join(os.environ["HOME"], "zulip-venv-cache")

def parse_args():
    # type: () -> argparse.Namespace
    parser = argparse.ArgumentParser(description="This script cleans unused zulip venv caches.",
                                     parents=[GENERIC_CACHE_SCRIPT_PARSER, ])
    args = parser.parse_args()
    return args

def get_caches_in_use(threshold_days):
    # type: (int) -> Set[Text]
    setups_to_check = set([ZULIP_PATH, ])
    caches_in_use = set()

    if ENV == "prod":
        setups_to_check |= get_recent_deployments(threshold_days)
    if ENV == "dev":
        CACHE_SYMLINK = os.path.join(os.path.dirname(ZULIP_PATH), "zulip-py3-venv")
        CURRENT_CACHE = os.path.dirname(os.path.realpath(CACHE_SYMLINK))
        caches_in_use.add(CURRENT_CACHE)

    for path in setups_to_check:
        for filename in os.listdir(os.path.join(path, "requirements")):
            requirements_file = os.path.join(path, "requirements", filename)
            deps = expand_reqs(requirements_file)
            hash_val = hash_deps(deps)
            caches_in_use.add(os.path.join(VENV_CACHE_DIR, hash_val))

    return caches_in_use

def main():
    # type: () -> None
    args = parse_args()
    caches_in_use = get_caches_in_use(args.threshold_days)
    purge_unused_caches(VENV_CACHE_DIR, caches_in_use, args.threshold_days, args.dry_run, "venv")

if __name__ == "__main__":
    main()