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"""

Check which packages should be dropped for the Mass Python 2 Package Removal:

https://fedoraproject.org/wiki/Changes/Mass_Python_2_Package_Removal

To run this:

- Install portingdb in a virtualenv:

python -m pip install -e.

- Run this script:

python -m portingdb check-drops

The script creates the directory `_check_drops`, containing cached stuff and

some result files.

"""

from pathlib import Path

import xml.sax

import os

import gzip

import sys

import time

import json

import subprocess

import configparser

import shutil

import collections

import tempfile

import contextlib

import click

from portingdb.load_data import get_data

cache_dir = Path('./_check_drops')

def log(*args, **kwargs):

"""Print to stderr"""

kwargs.setdefault('file', sys.stderr)

print(*args, **kwargs)

def handle_filename(result, filename):

"""Look at a filename a RPM installs, and update "result" accordingly"""

if filename.startswith((

'/usr/lib/python2.7/',

'/usr/lib64/python2.7/',

)):

# Importable module; consider this for dropping

result['notes'].add('Python 2 module')

result['ignore'] = False

if filename.endswith('info/entry_points.txt'):

result['notes'].add('Entrypoint')

result.setdefault('entrypoints', []).append(filename)

elif filename.startswith((

'/usr/lib/python2.7/site-packages/libtaskotron/ext/',

)):

# Taskotron extension

result['notes'].add('Taskotron extension')

result['keep'] = True

elif filename.startswith((

'/usr/lib/python3.7/',

'/usr/lib64/python3.7/',

)):

# Python 3 module; ignore here, but freak out

result['notes'].add('Python 3 module')

elif '/bin/cgi/' in filename:

# CGI script; might be needed

result['notes'].add('CGI script')

result['keep'] = True

result['filename_cgi'] = filename

elif filename.startswith((

'/usr/share/doc/',

'/usr/share/gtk-doc/',

'/usr/share/man/',

'/usr/share/licenses/',

)):

# Doc/licence; doesn't block dropping

result['notes'].add('Docs/Licences')

elif filename.startswith((

'/usr/share/locale/',

)) or '/LC_MESSAGES/' in filename or filename.endswith('.qm'):

# Locales; doesn't block dropping

result['notes'].add('Locales')

elif filename.startswith((

'/usr/share/icons/',

'/usr/share/pixmaps/',

)):

# Icons; doesn't block dropping

result['notes'].add('Icons')

elif dir_or_exact(filename, (

'/usr/share/pygtk/2.0/defs',

'/usr/share/gst-python/0.10/defs',

'/usr/share/pygtk/2.0/argtypes',

)) or filename.endswith((

'.glade',

'.ui',

)):

# UIs; doesn't block dropping

result['notes'].add('UIs')

elif filename.endswith((

'.html',

'.jinja2',

)) or 'templates' in filename:

# Templates; doesn't block dropping

result['notes'].add('Templates')

elif filename.startswith((

'/usr/lib/tmpfiles.d/',

'/usr/lib/udev/rules.d/',

'/usr/lib/pkgconfig/',

'/usr/lib64/pkgconfig/',

'/usr/share/bash-completion/',

'/usr/src/',

'/var/cache/',

'/var/lib/',

'/var/log/',

'/var/run/',

'/var/spool/',

'/var/tmp/',

'/etc/',

)):

# Logs/Cache/Config; doesn't block dropping

result['notes'].add('Logs/Cache/Config')

elif dir_or_exact(filename, (

'/usr/lib/.build-id',

)):

# Build ID; doesn't block dropping

result['notes'].add('Build ID')

elif dir_or_exact(filename, (

'/usr/lib/qt4/plugins/designer',

'/usr/lib64/qt4/plugins/designer',

'/usr/share/autocloud',

'/usr/share/conda',

'/usr/share/fmn.web',

'/usr/share/genmsg',

'/usr/share/gst-python',

'/usr/share/libavogadro',

'/usr/share/myhdl',

'/usr/share/ocio',

'/usr/share/os-brick',

'/usr/share/pgu',

'/usr/share/pygtk',

'/usr/share/pygtkchart',

'/usr/share/python-dmidecode',

'/usr/share/python-ldaptor',

'/usr/share/tomoe',

'/usr/share/viewvc',

'/usr/share/pygtk/2.0',

)):

# Various self contained files

result['notes'].add('Self Contained Files')

elif filename in (

'/usr/bin/tg-admin', # self contained for the module (TurboGears)

'/usr/bin/fai', # self contained for the module (Flask-AutoIndex)

# Those are hardcoded commands we don't care about

result['notes'].add('Ignored command')

result['filename_command_ignored'] = filename

elif filename.startswith((

'/usr/bin/',

'/usr/sbin/',

'/usr/libexec/',

'/usr/lib/systemd/system/',

)):

# Command; might be needed

result['notes'].add('Command')

result['keep'] = True

result['filename_command'] = filename

elif filename.startswith((

'/usr/share/appdata/',

'/usr/share/applications/',

'/usr/share/metainfo/',

)):

# Application; might be needed

result['notes'].add('Application')

result['keep'] = True

result['filename_application'] = filename

elif not filename.startswith((

'/usr/lib/python2.7/',

'/usr/lib64/python2.7/',

)):

# Something else; might be needed

result['notes'].add('Unknown file')

result['filename_unknown'] = filename

def handle_entrypoints(result, config):

"""Look at a parsed entrypoints config, update "result" accordingly"""

for section in config.sections():

if section in ('console_scripts', 'gui_scripts'):

# Checked as commands in /usr/bin

pass

elif section in ('distutils.setup_keywords',

'distutils.commands',

'cliff.formatter.show',

'openstack.congressclient.v1',

'fiona.fio_commands',

'python.templating.engines',

'turbomail.transports',

'twine.registered_commands',

'paste.app_factory',

'buildutils.optional_commands',

'zaqarclient.transport',

'apscheduler.triggers',

'zest.releaser.releaser.middle',

'babel.extractors', # babel has this +1 unused pkg

'babel.checkers',

'moksha.consumer',

'cliff.formatter.list',

'openstack.cli.extension', # the CLI should use py3

'beaker.backends', # only beaker has this

'sphinx_themes', # we only keep non leafs

'sphinx.html_themes',

'tw2.widgets', # plugins for a framework, not app

'gearbox.project_commands',

'gearbox.commands',

'openstack.data_processing.v1',

'openstack.baremetal_introspection.v1',

'openstack.container_infra.v1',

'openstack.load_balancer.v2',

'oslo.config',

'honcho_exporters', # self contained

'keystoneauth1.plugin', # self contained

'keystoneclient.plugin', # self contained

'oslo.db.migration', # self contained

) or section.startswith((

'apscheduler.', # self contained

'cliff.', # self contained

'glance_store.', # self contained

'turbogears.', # plugins for a framework, not app

'tgcaptcha2.', # self contained

'hghooks.', # self contained

'jjb.cli.', # self contained

'keystoneclient.', # self contained

'marrow.mailer.', # self contained

'oslo.middleware.', # self contained

'oslo.config.', # self contained

'pybtex.', # self contained

'pygments.', # pygments the tool is py3

'pyface.', # self contained

'turbomail.', # self contained

'setuptools.', # developer oriented, use virtualenv

'setuptools_scm.', # as ^

'shove.', # self contained

'statscache.', # self contained

'subliminal.', # self contained

'tooz.', # self contained

'versiontools.', # self contained

)):

# Decided to be useless and/or self contained

pass

elif section.startswith('paste.'):

pass

elif (section == 'envisage.plugins'

and result['name'] == 'python2-envisage'):

pass

elif section in ('trac.plugins', ):

result['keep'] = True

result['notes'].append('Trac plugin')

result['plugin_trac'] = section

elif section.startswith('avocado.plugins'):

result['keep'] = True

result['notes'].append('Avocado plugin')

result['plugin_avocado'] = section

elif section.startswith('pulp.extensions'):

result['keep'] = True

result['notes'].append('Pulp plugin')

result['plugin_pulp'] = section

elif section == 'certbot.plugins':

result['keep'] = True

result['notes'].append('Certobot plugin')

result['plugin_certbot'] = section

elif section in ('pytest11', 'nose.plugins', 'nose.plugins.0.10'):

# don't keep

result['notes'].append('Pytest/nose plugin')

result['plugin_pytest'] = section

elif section.startswith(('pylama.linter', 'flake8')):

# don't keep

result['notes'].append('Flake 8 / PyLama plugin')

result['plugin_pylama'] = section

else:

# Possibly a plugin

result['needs_investigation'] = True

result['plugin_unknown'] = section

def dir_or_exact(filename, patterns):

patterns = tuple(p[:-1] if p.endswith('/') else p for p in patterns)

dirs = tuple(p + '/' for p in patterns)

return filename.startswith(dirs) or filename in patterns

class SaxFilesHandler(xml.sax.ContentHandler):

def __init__(self):

super().__init__()

self.results = {}

self.filename_parts = None

def startElement(self, name, attrs):

if name == 'package':

name = attrs['name']

self.current_result = {

'name': name,

'arch': attrs['arch'],

'notes': set(),

'ignore': True,

}

elif name == 'version':

_cp = self.current_result

_cp['nevra'] = [

_cp['name'], attrs['epoch'], attrs['ver'], attrs['rel'],

_cp.pop('arch')]

elif name == 'file':

self.filename_parts = []

def endElement(self, name):

if name == 'package':

if not self.current_result.pop('ignore'):

self.current_result['notes'] = sorted(self.current_result['notes'])

log(self.current_result)

self.results[self.current_result['name']] = self.current_result

del self.current_result

elif name == 'file':

filename = ''.join(self.filename_parts)

handle_filename(self.current_result, filename)

self.filename_parts = None

def characters(self, content):

if self.filename_parts is not None:

self.filename_parts.append(content)

class SaxPrimaryHandler(xml.sax.ContentHandler):

def __init__(self):

super().__init__()

self._sources = collections.defaultdict(set)

self.name_parts = None

self.source_parts = None

@property

def sources(self):

return {k: list(v) for k, v in self._sources.items()}

def startElement(self, name, attrs):

if name == 'package' and attrs['type'] == 'rpm':

self.current_result = {}

elif name == 'name':

self.name_parts = []

elif name == 'rpm:sourcerpm':

self.source_parts = []

def endElement(self, name):

if name == 'package':

log(self.current_result)

source = self.current_result['source'].rsplit('-', 2)[0]

self._sources[source].add(self.current_result['name'])

del self.current_result

elif name == 'name':

self.current_result['name'] = ''.join(self.name_parts)

self.name_parts = None

elif name == 'rpm:sourcerpm':

self.current_result['source'] = ''.join(self.source_parts)

self.source_parts = None

def characters(self, content):

if self.name_parts is not None:

self.name_parts.append(content)

elif self.source_parts is not None:

self.source_parts.append(content)

@contextlib.contextmanager

def xmlfile(path):

path = Path(path)

try:

if path.suffix == '.gz':

fileobj = gzip.open(path, 'r')

elif path.suffix == '.zck':

import libdnf.utils # we only import if needed

# there is no library yet to read this, we need to unpack on disk

tmppath = tempfile.NamedTemporaryFile(delete=False)

tmppath.close()

libdnf.utils.decompress(str(path), tmppath.name, 0o644, '.zck')

fileobj = open(tmppath.name, 'r')

else:

# uncompressed XML maybe?

fileobj = open(path, 'r')

yield fileobj

finally:

with contextlib.suppress(NameError):

fileobj.close()

with contextlib.suppress(NameError):

tmppath.close()

os.unlink(tmppath.name)

@click.command(name='check-drops')

@click.option('-f', '--filelists', type=click.Path(exists=True),

default=None,

help='Location of the filelist xml.gz file '

'(required if not found automatically)')

@click.option('-p', '--primary', type=click.Path(exists=True),

default=None,

help='Location of the primary xml.gz file '

'(required if not found automatically)')

@click.option('-r', '--repo',

default='rawhide',

metavar='REPO',

show_default=True,

help='The repo to use for queries')

@click.option('--cache-sax/--no-cache-sax',

help='Use cached results of filelist parsing, if available '

'(crude; use when hacking on other parts of the code)')

@click.option('--cache-rpms/--no-cache-rpms',

help='Use previously downloaded RPMs '

'(crude; use when hacking on other parts of the code)')

@click.pass_context

def check_drops(ctx, filelists, primary, repo, cache_sax, cache_rpms):

"""Check packages that should be dropped from the distribution."""

data = get_data(*ctx.obj['datadirs'])

cache_dir.mkdir(exist_ok=True)

xml_paths = {}

for kind in 'filelists', 'primary':

xml_paths[kind] = locals()[kind]

if xml_paths[kind] is None:

glob = list(Path('/var/cache/dnf').glob(

f'{repo}-????????????????/repodata/*-{kind}.xml.*'))

if len(glob) == 1:

xml_paths[kind] = glob[0]

else:

raise click.BadParameter(

f"Repo {repo} doesn't have default {kind} XML")

# Analyze filelists.xml.(gz|zck) and primary.xml.(gz|zck)

cache_path = cache_dir / 'sax_results.json'

if (cache_sax and cache_path.exists()):

with cache_path.open('r') as f:

results, sources = json.load(f)

else:

with xmlfile(xml_paths['filelists']) as f:

handler = SaxFilesHandler()

xml.sax.parse(f, handler)

results = handler.results

with xmlfile(xml_paths['primary']) as p:

handler = SaxPrimaryHandler()

xml.sax.parse(p, handler)

sources = handler.sources

with cache_path.open('w') as f:

json.dump([results, sources], f)

log('Packages considered: ', len(results))

# For packages with entrypoints, download the corresponding RPM

entrypoint_packages = []

for name, result in results.items():

entrypoints = result.get('entrypoints')

if entrypoints and not result.get('keep'):

entrypoint_packages.append(name)

log('Packages with interesting entrypoints: ', len(entrypoint_packages))

rpm_dl_path = cache_dir / 'rpm_cache'

if rpm_dl_path.exists() and not cache_rpms:

shutil.rmtree(rpm_dl_path)

rpm_dl_path.mkdir(exist_ok=True)

while entrypoint_packages:

cp = subprocess.run(

['dnf', 'download', f'--repo={repo}', '--',

*entrypoint_packages],

cwd=rpm_dl_path,

stdout=sys.stderr,

stderr=subprocess.PIPE,

universal_newlines=True,

env={**os.environ, 'LANG': 'C.utf-8'})

if cp.returncode == 0:

break

log(cp.stderr, end='')

# Error: No package python2-foo available.

package = cp.stderr.splitlines()[-1].split(' ')[-2]

entrypoint_packages.remove(package)

# Analyze entrypoints from downloaded RPMs

for rpm_path in rpm_dl_path.iterdir():

proc = subprocess.run(

['rpm', '-q', '--qf', '%{name}', '-p', rpm_path],

stdout=subprocess.PIPE,

check=True)

name = proc.stdout.decode('utf-8')

result = results.get(name)

if result:

for entrypoint in result.get('entrypoints'):

rmp2cpio_proc = subprocess.Popen(

['rpm2cpio', rpm_path],

stdout=subprocess.PIPE)

cpio_proc = subprocess.run(

['cpio', '-i', '--to-stdout', '.' + entrypoint],

stdout=subprocess.PIPE,

stdin=rmp2cpio_proc.stdout,

check=True)

if rmp2cpio_proc.wait() != 0:

raise Exception()

config = configparser.ConfigParser()

if not cpio_proc.stdout:

result.setdefault('empty_entrypoints', []).append(entrypoint)

result['needs_investigation'] = True

result['keep'] = True

continue

try:

config.read_string(cpio_proc.stdout.decode('utf-8'))

except configparser.Error as e:

result.setdefault('bad_entrypoints', {})[entrypoint] = str(e)

result['needs_investigation'] = True

result['keep'] = True

continue

handle_entrypoints(result, config)

result['entrypoints_handled'] = True

# Adjust "needs_investigation" for unknown files and unhandled entrypoints

for name, result in results.items():

if not result.get('keep'):

entrypoints = result.get('entrypoints')

if result.get('entrypoints'):

if not result.pop('entrypoints_handled', False):

result['notes'].append('Entrypoints not handled')

result['needs_investigation'] = True

if result.get('filename_unknown'):

result['needs_investigation'] = True

# Set legacy_leaf flags

for pkg in data['packages'].values():

for rpm_name, rpm in pkg['rpms'].items():

# TODO: better way to match portingdb entry to package name

name = rpm_name.rsplit('-', 2)[0]

result = results.get(name)

if result:

result['legacy_leaf'] = rpm['legacy_leaf']

# hardcoded packages

# catfish is seriously mispackaged,

# see https://src.fedoraproject.org/rpms/catfish/pull-request/1

if 'catfish' in results:

results['catfish']['needs_investigation'] = True

def keep_manually(name, reason):

if name in results:

results[name]['keep'] = True

results[name]['notes'].append(reason)

# rpkg needs to stay for 3rd party consumers

keep_manually('python2-rpkg', 'rhpkg+rfpkg dependency')

# https://bugzilla.redhat.com/show_bug.cgi?id=1629435

keep_manually('python2-q', 'debugging tool')

# python-requests-cache is needed for MythTV @ RPM Fusion

keep_manually('python2-requests-cache', 'MythTV dependency')

for result in results.values():

if result.get('needs_investigation'):

result['verdict'] = 'investigate'

elif result.get('keep'):

result['verdict'] = 'keep'

elif result.get('legacy_leaf'):

result['verdict'] = 'drop_now'

else:

result['verdict'] = 'drop_later'

# Set sources and determine retirement action

for name, result in results.items():

result['source'], *_ = (s for s, p in sources.items() if name in p)

for source, pkgs in sources.items():

local_results = [r for r in results.values() if r['name'] in pkgs]

if len(local_results) < len(pkgs):

# subpackages we know nothing about

source_verdict = 'keep'

elif all(r['verdict'] == 'drop_now' for r in local_results):

source_verdict = 'retire_now'

elif all(r['verdict'].startswith('drop_') for r in local_results):

source_verdict = 'retire_later'

else:

source_verdict = 'keep'

for result in local_results:

result['source_verdict'] = source_verdict

# Output it all

print(json.dumps(results, indent=2))

with open(cache_dir / ('results.json'), 'w') as f:

json.dump(results, f, indent=2)

with open(cache_dir / ('results-sources.json'), 'w') as f:

json.dump(sources, f, indent=2)

log('\nBinary packages:')

stats_counter = collections.Counter(r['verdict'] for r in results.values())

for package, number in stats_counter.most_common():

log('{}: {}'.format(number, package))

for verdict in stats_counter:

filtered = {n: r for n, r in results.items() if r['verdict'] == verdict}

with open(cache_dir / ('results-' + verdict + '.json'), 'w') as f:

json.dump(filtered, f, indent=2)

with open(cache_dir / ('results-' + verdict + '.txt'), 'w') as f:

for name in filtered:

print(name, file=f)

log('\nSource packages:')

# we will loose some information here, but that is OK for stats

source_results = {result['source']: result for result in results.values()}

stats_counter = collections.Counter(r['source_verdict'] for r in source_results.values())

for package, number in stats_counter.most_common():

log('{}: {}'.format(number, package))

for verdict in stats_counter:

if verdict == 'keep':

continue

filtered = {n: r for n, r in results.items() if r['source_verdict'] == verdict}

with open(cache_dir / ('results-' + verdict + '-srpms.json'), 'w') as f:

json.dump(filtered, f, indent=2)

with open(cache_dir / ('results-' + verdict + '-srpms.txt'), 'w') as f:

for name in set(r['source'] for r in filtered.values()):

print(name, file=f)

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