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conda_mirror.py
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import argparse
import bz2
import fnmatch
import hashlib
import json
import logging
import multiprocessing
import os
import pdb
import shutil
import sys
import tarfile
import tempfile
from pprint import pformat
import requests
import yaml
logger = None
DEFAULT_BAD_LICENSES = ['agpl', '']
DEFAULT_PLATFORMS = ['linux-64',
'linux-32',
'osx-64',
'win-64',
'win-32']
def _maybe_split_channel(channel):
"""Split channel if it is fully qualified.
Otherwise default to conda.anaconda.org
Parameters
----------
channel : str
channel on anaconda, like "conda-forge" or fully qualified channel like
"https://conda.anacocnda.org/conda-forge"
Returns
-------
download_template : str
defaults to
"https://conda.anaconda.org/{channel}/{platform}/{file_name}"
The base url will be modified if the `channel` input parameter is
fully qualified
channel : str
The name-only channel. If the channel input param is something like
"conda-forge", then "conda-forge" will be returned. If the channel
input param is something like "https://repo.continuum.io/pkgs/free/"
"""
# strip trailing slashes
channel = channel.strip('/')
default_url_base = "https://conda.anaconda.org/"
url_suffix = "/{channel}/{platform}/{file_name}"
if '://' not in channel:
# assume we are being given a channel for anaconda.org
logger.debug("Assuming %s is an anaconda.org channel", channel)
url = default_url_base + url_suffix
return url, channel
# looks like we are being given a fully qualified channel
download_base, channel = channel.rsplit('/', 1)
download_template = download_base + url_suffix
logger.debug('download_template=%s. channel=%s',
download_template, channel)
return download_template, channel
def _match(all_packages, key_glob_dict):
"""
Parameters
----------
all_packages : iterable
Iterable of package metadata dicts from repodata.json
key_glob_dict : iterable of kv pairs
Iterable of (key, glob_value) dicts
Returns
-------
matched : dict
Iterable of package metadata dicts which match the `target_packages`
(key, glob_value) tuples
"""
matched = dict()
key_glob_dict = {key.lower(): glob.lower()
for key, glob
in key_glob_dict.items()}
for pkg_name, pkg_info in all_packages.items():
matched_all = []
# normalize the strings so that comparisons are easier
for key, pattern in key_glob_dict.items():
name = str(pkg_info.get(key, '')).lower()
if fnmatch.fnmatch(name, pattern):
matched_all.append(True)
else:
matched_all.append(False)
if all(matched_all):
matched.update({pkg_name: pkg_info})
return matched
def _make_arg_parser():
"""
Localize the ArgumentParser logic
Returns
-------
argument_parser : argparse.ArgumentParser
The instantiated argument parser for this CLI
"""
ap = argparse.ArgumentParser(
description="CLI interface for conda-mirror.py")
ap.add_argument(
'--upstream-channel',
help=('The target channel to mirror. Can be a channel on anaconda.org '
'like "conda-forge" or a full qualified channel like '
'"https://repo.continuum.io/pkgs/free/"'),
)
ap.add_argument(
'--target-directory',
help='The place where packages should be mirrored to',
)
ap.add_argument(
'--temp-directory',
help=(
'Temporary download location for the packages. Defaults to a '
'randomly selected temporary directory. Note that you might need '
'to specify a different location if your default temp directory '
'has less available space than your mirroring target'),
default=tempfile.gettempdir()
)
ap.add_argument(
'--platform',
help=("The OS platform(s) to mirror. one of: {'linux-64', 'linux-32',"
"'osx-64', 'win-32', 'win-64'}"),
)
ap.add_argument(
'-v', '--verbose',
action="count",
help=("logging defaults to error/exception only. Takes up to three "
"'-v' flags. '-v': warning. '-vv': info. '-vvv': debug."),
default=0,
)
ap.add_argument(
'--config',
action="store",
help="Path to the yaml config file",
)
ap.add_argument(
'--pdb',
action="store_true",
help="Enable PDB debugging on exception",
default=False,
)
ap.add_argument(
'--num-threads',
action="store",
default=1,
type=int,
help="Num of threads for validation. 1: Serial mode. 0: All available."
)
ap.add_argument(
'--version',
action="store_true",
help="Print version and quit",
default=False,
)
ap.add_argument(
'--dry-run',
action="store_true",
help=("Show what will be downloaded and what will be removed. Will not "
"validate existing packages"),
default=False
)
ap.add_argument(
'--no-validate-target',
action="store_true",
help="Skip validation of files already present in target-directory",
default=False,
)
ap.add_argument(
'--minimum-free-space',
help=("Threshold for free diskspace. Given in megabytes."),
type=int,
default=1000,
)
return ap
def _init_logger(verbosity):
# set up the logger
global logger
logger = logging.getLogger('conda_mirror')
logmap = {0: logging.ERROR,
1: logging.WARNING,
2: logging.INFO,
3: logging.DEBUG}
loglevel = logmap.get(verbosity, '3')
# clear all handlers
for handler in logger.handlers:
logger.removeHandler(handler)
logger.setLevel(loglevel)
format_string = '%(levelname)s: %(message)s'
formatter = logging.Formatter(fmt=format_string)
stream_handler = logging.StreamHandler()
stream_handler.setLevel(loglevel)
stream_handler.setFormatter(fmt=formatter)
logger.addHandler(stream_handler)
print("Log level set to %s" % logging.getLevelName(logmap[verbosity]),
file=sys.stdout)
def _parse_and_format_args():
"""
Collect arguments from sys.argv and invoke the main() function.
"""
parser = _make_arg_parser()
args = parser.parse_args()
# parse arguments without setting defaults
given_args, _ = parser._parse_known_args(sys.argv[1:], argparse.Namespace())
_init_logger(args.verbose)
logger.debug('sys.argv: %s', sys.argv)
if args.version:
from . import __version__
print(__version__)
sys.exit(1)
config_dict = {}
if args.config:
logger.info("Loading config from %s", args.config)
with open(args.config, 'r') as f:
config_dict = yaml.load(f)
logger.info("config: %s", config_dict)
# use values from config file unless explicitly given on command line
for a in parser._actions:
if (
# value exists in config file
(a.dest in config_dict) and
# ignore values that can only be given on command line
(a.dest not in {'config', 'verbose', 'version'}) and
# only use config file value if the value was not explicitly given on command line
(a.dest not in given_args)
):
logger.info("Using %s value from config file", a.dest)
setattr(args, a.dest, config_dict.get(a.dest))
blacklist = config_dict.get('blacklist')
whitelist = config_dict.get('whitelist')
for required in ('target_directory', 'platform', 'upstream_channel'):
if (not getattr(args, required)):
raise ValueError("Missing command line argument: %s", required)
if args.pdb:
# set the pdb_hook as the except hook for all exceptions
def pdb_hook(exctype, value, traceback):
pdb.post_mortem(traceback)
sys.excepthook = pdb_hook
return {
'upstream_channel': args.upstream_channel,
'target_directory': args.target_directory,
'temp_directory': args.temp_directory,
'platform': args.platform,
'num_threads': args.num_threads,
'blacklist': blacklist,
'whitelist': whitelist,
'dry_run': args.dry_run,
'no_validate_target': args.no_validate_target,
'minimum_free_space': args.minimum_free_space,
}
def cli():
"""Thin wrapper around parsing the cli args and calling main with them
"""
main(**_parse_and_format_args())
def _remove_package(pkg_path, reason):
"""
Log and remove a package.
Parameters
----------
pkg_path : str
Path to a conda package that should be removed
Returns
-------
pkg_path : str
The full path to the package that is being removed
reason : str
The reason why the package is being removed
"""
msg = "Removing: %s. Reason: %s" % (pkg_path, reason)
logger.warning(msg)
os.remove(pkg_path)
return pkg_path, msg
def _validate(filename, md5=None, size=None):
"""Validate the conda package tarfile located at `filename` with any of the
passed in options `md5` or `size. Also implicitly validate that
the conda package is a valid tarfile.
NOTE: Removes packages that fail validation
Parameters
----------
filename : str
The path to the file you wish to validate
md5 : str, optional
If provided, perform an `md5sum` on `filename` and compare to `md5`
size : int, optional
if provided, stat the file at `filename` and make sure its size
matches `size`
Returns
-------
pkg_path : str
The full path to the package that is being removed
reason : str
The reason why the package is being removed
"""
if md5:
calc = hashlib.md5(open(filename, 'rb').read()).hexdigest()
if calc == md5:
# If the MD5 matches, skip the other checks
return filename, None
else:
return _remove_package(
filename,
reason="Failed md5 validation. Expected: %s. Computed: %s"
% (calc, md5))
if size and size != os.stat(filename).st_size:
return _remove_package(filename, reason="Failed size test")
try:
with tarfile.open(filename) as t:
t.extractfile('info/index.json').read().decode('utf-8')
except (tarfile.TarError, EOFError):
logger.info("Validation failed because conda package is corrupted.",
exc_info=True)
return _remove_package(filename, reason="Tarfile read failure")
return filename, None
def get_repodata(channel, platform):
"""Get the repodata.json file for a channel/platform combo on anaconda.org
Parameters
----------
channel : str
anaconda.org/CHANNEL
platform : {'linux-64', 'linux-32', 'osx-64', 'win-32', 'win-64'}
The platform of interest
Returns
-------
info : dict
packages : dict
keyed on package name (e.g., twisted-16.0.0-py35_0.tar.bz2)
"""
url_template, channel = _maybe_split_channel(channel)
url = url_template.format(channel=channel, platform=platform,
file_name='repodata.json')
resp = requests.get(url).json()
info = resp.get('info', {})
packages = resp.get('packages', {})
# Patch the repodata.json so that all package info dicts contain a "subdir"
# key. Apparently some channels on anaconda.org do not contain the
# 'subdir' field. I think this this might be relegated to the
# Continuum-provided channels only, actually.
for pkg_name, pkg_info in packages.items():
pkg_info.setdefault('subdir', platform)
return info, packages
def _download(url, target_directory):
"""Download `url` to `target_directory`
Parameters
----------
url : str
The url to download
target_directory : str
The path to a directory where `url` should be downloaded
Returns
-------
file_size: int
The size in bytes of the file that was downloaded
"""
file_size = 0
chunk_size = 1024 # 1KB chunks
logger.info("download_url=%s", url)
# create a temporary file
target_filename = url.split('/')[-1]
download_filename = os.path.join(target_directory, target_filename)
logger.debug('downloading to %s', download_filename)
with open(download_filename, 'w+b') as tf:
ret = requests.get(url, stream=True)
for data in ret.iter_content(chunk_size):
tf.write(data)
file_size = os.path.getsize(download_filename)
return file_size
def _list_conda_packages(local_dir):
"""List the conda packages (*.tar.bz2 files) in `local_dir`
Parameters
----------
local_dir : str
Some local directory with (hopefully) some conda packages in it
Returns
-------
list
List of conda packages in `local_dir`
"""
contents = os.listdir(local_dir)
return fnmatch.filter(contents, "*.tar.bz2")
def _validate_packages(package_repodata, package_directory, num_threads=1):
"""Validate local conda packages.
NOTE1: This will remove any packages that are in `package_directory` that
are not in `repodata` and also any packages that fail the package
validation
NOTE2: In concurrent mode (num_threads is not 1) this might be hard to kill
using CTRL-C.
Parameters
----------
package_repodata : dict
The contents of repodata.json
package_directory : str
Path to the local repo that contains conda packages
num_threads : int
Number of concurrent processes to use. Set to `0` to use a number of
processes equal to the number of cores in the system. Defaults to `1`
(i.e. serial package validation).
Returns
-------
list
Iterable of twoples of (pkg_path, reason) where
pkg_path : str
The full path to the package that is being removed
reason : str
The reason why the package is being removed
"""
# validate local conda packages
local_packages = _list_conda_packages(package_directory)
# create argument list (necessary because multiprocessing.Pool.map does not
# accept additional args to be passed to the mapped function)
num_packages = len(local_packages)
val_func_arg_list = [(package, num, num_packages, package_repodata,
package_directory)
for num, package in enumerate(sorted(local_packages))]
if num_threads == 1 or num_threads is None:
# Do serial package validation (Takes a long time for large repos)
validation_results = map(_validate_or_remove_package,
val_func_arg_list)
else:
if num_threads == 0:
num_threads = os.cpu_count()
logger.debug('num_threads=0 so it will be replaced by all available '
'cores: %s' % num_threads)
logger.info('Will use {} threads for package validation.'
''.format(num_threads))
p = multiprocessing.Pool(num_threads)
validation_results = p.map(_validate_or_remove_package,
val_func_arg_list)
p.close()
p.join()
return validation_results
def _validate_or_remove_package(args):
"""Validata or remove package.
Parameters
----------
args : tuple
- `args[0]` is `package`.
- `args[1]` is the number of the package in the list of all packages.
- `args[2]` is the number of all packages.
- `args[3]` is `package_repodata`.
- `args[4]` is `package_directory`.
Returns
-------
pkg_path : str
The full path to the package that is being removed
reason : str
The reason why the package is being removed
"""
# unpack arg tuple tuple
package = args[0]
num = args[1]
num_packages = args[2]
package_repodata = args[3]
package_directory = args[4]
# ensure the packages in this directory are in the upstream
# repodata.json
try:
package_metadata = package_repodata[package]
except KeyError:
logger.warning("%s is not in the upstream index. Removing...",
package)
reason = "Package is not in the repodata index"
package_path = os.path.join(package_directory, package)
return _remove_package(package_path, reason=reason)
# validate the integrity of the package, the size of the package and
# its hashes
logger.info('Validating {:4d} of {:4d}: {}.'.format(num + 1, num_packages,
package))
package_path = os.path.join(package_directory, package)
return _validate(package_path,
md5=package_metadata.get('md5'),
size=package_metadata.get('size'))
def main(upstream_channel, target_directory, temp_directory, platform,
blacklist=None, whitelist=None, num_threads=1, dry_run=False,
no_validate_target=False, minimum_free_space=0):
"""
Parameters
----------
upstream_channel : str
The anaconda.org channel that you want to mirror locally
e.g., "conda-forge" or
the defaults channel at "https://repo.continuum.io/pkgs/free"
target_directory : str
The path on disk to produce a local mirror of the upstream channel.
Note that this is the directory that contains the platform
subdirectories.
temp_directory : str
The path on disk to an existing and writable directory to temporarily
store the packages before moving them to the target_directory to
apply checks
platform : str
The platform that you wish to mirror for. Common options are
'linux-64', 'osx-64', 'win-64' and 'win-32'. Any platform is valid as
long as the url resolves.
blacklist : iterable of tuples, optional
The values of blacklist should be (key, glob) where key is one of the
keys in the repodata['packages'] dicts and glob is a thing to match
on. Note that all comparisons will be laundered through lowercasing.
whitelist : iterable of tuples, optional
The values of blacklist should be (key, glob) where key is one of the
keys in the repodata['packages'] dicts and glob is a thing to match
on. Note that all comparisons will be laundered through lowercasing.
num_threads : int, optional
Number of threads to be used for concurrent validation. Defaults to
`num_threads=1` for non-concurrent mode. To use all available cores,
set `num_threads=0`.
dry_run : bool, optional
Defaults to False.
If True, skip validation and exit after determining what needs to be
downloaded and what needs to be removed.
no_validate_target : bool, optional
Defaults to False.
If True, skip validation of files already present in target_directory.
minimum_free_space : int, optional
Stop downloading when free space target_directory or temp_directory reach this threshold.
Returns
-------
dict
Summary of what was removed and what was downloaded.
keys are:
- validation : set of (path, reason) for each package that was validated.
packages where reason=None is a sentinel for a successful validation
- download : set of (url, download_path) for each package that
was downloaded
Notes
-----
the repodata['packages'] dictionary is formatted like this:
keys are filenames, e.g.:
tk-8.5.18-0.tar.bz2
values are dictionaries, e.g.:
{'arch': 'x86_64',
'binstar': {'channel': 'main',
'owner_id': '55fc8527d3234d09d4951c71',
'package_id': '56380a159c73330b8ae858b8'},
'build': '0',
'build_number': 0,
'date': '2015-03-16',
# depends is the legacy key for old versions of conda
'depends': [],
'license': 'BSD-like',
'license_family': 'BSD',
'md5': '902f0fd689a01a835c9e69aefbe58fdd',
'name': 'tk',
'platform': 'linux',
# requires is the new key that specifies the package requirements
old versions of conda
'requires': [],
'size': 1960193,
'version': '8.5.18'}
"""
# Steps:
# 1. figure out blacklisted packages
# 2. un-blacklist packages that are actually whitelisted
# 3. remove blacklisted packages
# 4. figure out final list of packages to mirror
# 5. mirror new packages to temp dir
# 6. validate new packages
# 7. copy new packages to repo directory
# 8. download repodata.json and repodata.json.bz2
# 9. copy new repodata.json and repodata.json.bz2 into the repo
summary = {
'validating-existing': set(),
'validating-new': set(),
'downloaded': set(),
'blacklisted': set(),
'to-mirror': set()
}
# Implementation:
if not os.path.exists(os.path.join(target_directory, platform)):
os.makedirs(os.path.join(target_directory, platform))
info, packages = get_repodata(upstream_channel, platform)
local_directory = os.path.join(target_directory, platform)
# 1. validate local repo
# validating all packages is taking many hours.
# _validate_packages(repodata=repodata,
# package_directory=local_directory,
# num_threads=num_threads)
# 2. figure out blacklisted packages
blacklist_packages = {}
whitelist_packages = {}
# match blacklist conditions
if blacklist:
blacklist_packages = {}
for blist in blacklist:
logger.debug('blacklist item: %s', blist)
matched_packages = _match(packages, blist)
logger.debug(pformat(list(matched_packages.keys())))
blacklist_packages.update(matched_packages)
# 3. un-blacklist packages that are actually whitelisted
# match whitelist on blacklist
if whitelist:
whitelist_packages = {}
for wlist in whitelist:
matched_packages = _match(packages, wlist)
whitelist_packages.update(matched_packages)
# make final mirror list of not-blacklist + whitelist
true_blacklist = set(blacklist_packages.keys()) - set(
whitelist_packages.keys())
summary['blacklisted'].update(true_blacklist)
logger.info("BLACKLISTED PACKAGES")
logger.info(pformat(true_blacklist))
# Get a list of all packages in the local mirror
if dry_run:
local_packages = _list_conda_packages(local_directory)
packages_slated_for_removal = [
pkg_name for pkg_name in local_packages if pkg_name in summary['blacklisted']
]
logger.info("PACKAGES TO BE REMOVED")
logger.info(pformat(packages_slated_for_removal))
possible_packages_to_mirror = set(packages.keys()) - true_blacklist
# 4. Validate all local packages
# construct the desired package repodata
desired_repodata = {pkgname: packages[pkgname]
for pkgname in possible_packages_to_mirror}
if not (dry_run or no_validate_target):
# Only validate if we're not doing a dry-run
validation_results = _validate_packages(desired_repodata, local_directory, num_threads)
summary['validating-existing'].update(validation_results)
# 5. figure out final list of packages to mirror
# do the set difference of what is local and what is in the final
# mirror list
local_packages = _list_conda_packages(local_directory)
to_mirror = possible_packages_to_mirror - set(local_packages)
logger.info('PACKAGES TO MIRROR')
logger.info(pformat(sorted(to_mirror)))
summary['to-mirror'].update(to_mirror)
if dry_run:
logger.info("Dry run complete. Exiting")
return summary
# 6. for each download:
# a. download to temp file
# b. validate contents of temp file
# c. move to local repo
# mirror all new packages
total_bytes = 0
minimum_free_space_kb = (minimum_free_space * 1024 * 1024)
download_url, channel = _maybe_split_channel(upstream_channel)
with tempfile.TemporaryDirectory(dir=temp_directory) as download_dir:
logger.info('downloading to the tempdir %s', download_dir)
for package_name in sorted(to_mirror):
url = download_url.format(
channel=channel,
platform=platform,
file_name=package_name)
try:
# make sure we have enough free disk space in the temp folder to meet threshold
if shutil.disk_usage(download_dir).free < minimum_free_space_kb:
logger.error('Disk space below threshold in %s. Aborting download.',
download_dir)
break
# download package
total_bytes += _download(url, download_dir)
# make sure we have enough free disk space in the target folder to meet threshold
# while also being able to fit the packages we have already downloaded
if (shutil.disk_usage(local_directory).free - total_bytes) < minimum_free_space_kb:
logger.error('Disk space below threshold in %s. Aborting download',
local_directory)
break
summary['downloaded'].add((url, download_dir))
except Exception as ex:
logger.exception('Unexpected error: %s. Aborting download.', ex)
break
# validate all packages in the download directory
validation_results = _validate_packages(packages, download_dir,
num_threads=num_threads)
summary['validating-new'].update(validation_results)
logger.debug('Newly downloaded files at %s are %s',
download_dir,
pformat(os.listdir(download_dir)))
# 8. Use already downloaded repodata.json contents but prune it of
# packages we don't want
repodata = {'info': info, 'packages': packages}
# compute the packages that we have locally
packages_we_have = set(local_packages +
_list_conda_packages(download_dir))
# remake the packages dictionary with only the packages we have
# locally
repodata['packages'] = {
name: info for name, info in repodata['packages'].items()
if name in packages_we_have}
_write_repodata(download_dir, repodata)
# move new conda packages
for f in _list_conda_packages(download_dir):
old_path = os.path.join(download_dir, f)
new_path = os.path.join(local_directory, f)
logger.info("moving %s to %s", old_path, new_path)
shutil.move(old_path, new_path)
for f in ('repodata.json', 'repodata.json.bz2'):
download_path = os.path.join(download_dir, f)
move_path = os.path.join(local_directory, f)
shutil.move(download_path, move_path)
# Also need to make a "noarch" channel or conda gets mad
noarch_path = os.path.join(target_directory, 'noarch')
if not os.path.exists(noarch_path):
os.makedirs(noarch_path, exist_ok=True)
noarch_repodata = {'info': {}, 'packages': {}}
_write_repodata(noarch_path, noarch_repodata)
return summary
def _write_repodata(package_dir, repodata_dict):
data = json.dumps(repodata_dict, indent=2, sort_keys=True)
# strip trailing whitespace
data = '\n'.join(line.rstrip() for line in data.splitlines())
# make sure we have newline at the end
if not data.endswith('\n'):
data += '\n'
with open(os.path.join(package_dir,
'repodata.json'), 'w') as fo:
fo.write(data)
# compress repodata.json into the bz2 format. some conda commands still
# need it
bz2_path = os.path.join(package_dir, 'repodata.json.bz2')
with open(bz2_path, 'wb') as fo:
fo.write(bz2.compress(data.encode('utf-8')))
if __name__ == "__main__":
cli()