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"""
# Pwntools Update
In order to ensure that Pwntools users always have the latest and
greatest version, Pwntools automatically checks for updates.
Since this update check takes a moment, it is only performed once
every week. It can be permanently disabled via:
::
$ echo never > ~/.cache/.pwntools-cache-*/update
Or adding the following lines to ~/.pwn.conf (or system-wide /etc/pwn.conf):
::
[update]
interval=never
"""
from __future__ import absolute_import
from __future__ import division
import datetime
import json
import os
import time
import packaging.version
from pwnlib.args import args
from pwnlib.config import register_config
from pwnlib.context import context
from pwnlib.log import getLogger
from pwnlib.util.misc import read
from pwnlib.util.misc import write
from pwnlib.util.web import wget
from pwnlib.version import __version__
log = getLogger(__name__)
current_version = packaging.version.Version(__version__)
package_name = 'pwntools'
package_repo = 'Gallopsled/pwntools'
update_freq = datetime.timedelta(days=7).total_seconds()
disabled = False
def read_update_config(settings):
for key, value in settings.items():
if key == 'interval':
if value == 'never':
global disabled
disabled = True
else:
try:
value = int(value)
except ValueError:
log.warn("Wrong value")
else:
global update_freq
update_freq = datetime.timedelta(days=value).total_seconds()
else:
log.warn("Unknown configuration option %r in section %r" % (key, 'update'))
register_config('update', read_update_config)
def available_on_pypi(prerelease=current_version.is_prerelease):
"""Return True if an update is available on PyPI.
>>> available_on_pypi() # doctest: +ELLIPSIS
<Version('...')>
>>> available_on_pypi(prerelease=False).is_prerelease
False
"""
# Deferred import to save startup time
import requests
versions = getattr(available_on_pypi, 'cached', None)
if versions is None:
response = requests.get("https://pypi.org/simple/pwntools/",
headers={"Accept": "application/vnd.pypi.simple.v1+json"},
timeout=5)
response.raise_for_status()
versions = response.json()["versions"]
available_on_pypi.cached = versions
versions = map(packaging.version.Version, versions)
if not prerelease:
versions = filter(lambda v: not v.is_prerelease, versions)
return max(versions)
def cache_file():
"""Returns the path of the file used to cache update data, and ensures that it exists."""
cache_dir = context.cache_dir
if not cache_dir:
return None
cache_file = os.path.join(cache_dir, 'update')
if not os.path.isdir(cache_dir):
os.makedirs(cache_dir)
if not os.path.exists(cache_file):
write(cache_file, '')
return cache_file
def last_check():
"""Return the date of the last check"""
cache = cache_file()
if cache:
return os.path.getmtime(cache_file())
# Fallback
return time.time()
def should_check():
"""Return True if we should check for an update"""
filename = cache_file()
if not filename:
return False
if disabled or read(filename).strip() == b'never':
return False
return time.time() > (last_check() + update_freq)
def perform_check(prerelease=current_version.is_prerelease):
"""Perform the update check, and report to the user.
Arguments:
prerelease(bool): Whether or not to include pre-release versions.
Returns:
A list of arguments to the update command.
>>> from packaging.version import Version
>>> pwnlib.update.current_version = Version("999.0.0")
>>> print(perform_check())
None
>>> pwnlib.update.current_version = Version("0.0.0")
>>> perform_check() # doctest: +ELLIPSIS
['pip', 'install', '-U', ...]
>>> def bail(*a): raise Exception()
>>> pypi = pwnlib.update.available_on_pypi
>>> perform_check(prerelease=False)
['pip', 'install', '-U', 'pwntools']
>>> perform_check(prerelease=True) # doctest: +ELLIPSIS
['pip', 'install', '-U', 'pwntools...']
"""
pypi = current_version
try:
pypi = available_on_pypi(prerelease)
except Exception:
log.warning("An issue occurred while checking PyPI")
best = max(pypi, current_version)
where = None
command = None
cache = cache_file()
if cache:
os.utime(cache, None)
if best == current_version:
log.info("You have the latest version of Pwntools (%s)" % best)
return
command = [
'pip',
'install',
'-U'
]
if best == pypi:
where = 'pypi'
pypi_package = package_name
if best.is_prerelease:
pypi_package += '==%s' % (best)
command += [pypi_package]
command_str = ' '.join(command)
log.info("A newer version of %s is available on %s (%s --> %s).\n" % (package_name, where, current_version, best) +
"Update with: $ %s" % command_str)
return command
def check_automatically():
xdg_config_home = os.environ.get('XDG_CONFIG_HOME') or "~/.config"
if should_check():
message = ["Checking for new versions of %s" % package_name]
message += ["To disable this functionality, set the contents of %s to 'never' (old way)." % cache_file()]
message += ["Or add the following lines to ~/.pwn.conf or %s/pwn.conf (or /etc/pwn.conf system-wide):" % xdg_config_home]
message += ["""\
[update]
interval=never"""]
log.info("\n".join(message))
perform_check()
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