optools/centos/extract_files_package.py

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2019-01-09 14:44:42 -05:00
#!/usr/bin/env python
# Supports CentOS 6.9 and up, untested on lower versions.
# Lets you extract files for a given package name(s) without installing
# any extra packages (such as yum-utils for repoquery).
# NOTE: If you're on CentOS 6.x, since it uses such an ancient version of python you need to either install
# python-argparse OR just resign to using it for all packages with none of the features.
try:
import argparse
has_argparse = True
except ImportError:
has_argparse = False
import os
import re
import shutil
import tempfile
# For when CentOS/RHEL switch to python 3 by default (if EVER).
import sys
pyver = sys.version_info
try:
import yum
# Needed for verbosity
from yum.logginglevels import __NO_LOGGING as yum_nolog
has_yum = True
except ImportError:
has_yum = False
exit('This script only runs on the system-provided Python on RHEL/CentOS/other RPM-based distros.')
try:
# pip install libarchive
# https://github.com/dsoprea/PyEasyArchive
import libarchive.public as lap
is_ctype = False
except ImportError:
try:
# pip install libarchive
# https://github.com/Changaco/python-libarchive-c
import libarchive
if 'file_reader' in dir(libarchive):
is_legacy = False
else:
# https://code.google.com/archive/p/python-libarchive
is_legacy = True
is_ctype = True
except ImportError:
raise ImportError('Try yum -y install python-libarchive')
class FileExtractor(object):
def __init__(self, dest_dir, paths, verbose = False, *args, **kwargs):
self.dest_dir = os.path.abspath(os.path.expanduser(dest_dir))
self.verbose = verbose # TODO: print file name as extracting? Verbose as argument?
self.rpms = {}
if 'pkgs' in kwargs and kwargs['pkgs']:
self.pkgs = kwargs['pkgs']
self.yum_getFiles()
if 'rpm_files' in kwargs and kwargs['rpm_files']:
self.rpm_files = kwargs['rpm_files']
self.getFiles()
if '*' in paths:
self.paths = None
else:
self.paths = [re.sub('^', '.', os.path.abspath(i)) for i in paths]
def yum_getFiles(self):
import logging
yumloggers = ['yum.filelogging.RPMInstallCallback', 'yum.verbose.Repos', 'yum.verbose.plugin', 'yum.Depsolve',
'yum.verbose', 'yum.plugin', 'yum.Repos', 'yum', 'yum.verbose.YumBase', 'yum.filelogging',
'yum.verbose.YumPlugins', 'yum.RepoStorage', 'yum.YumBase', 'yum.filelogging.YumBase',
'yum.verbose.Depsolve']
# This actually silences everything. Nice.
# https://stackoverflow.com/a/46716482/733214
if not self.verbose:
for loggerName in yumloggers:
logger = logging.getLogger(loggerName)
logger.setLevel(yum_nolog)
# http://yum.baseurl.org/api/yum/yum/__init__.html#yumbase
yb = yum.YumBase()
yb.conf.downloadonly = True
yb.conf.downloaddir = os.path.join(self.dest_dir, '.CACHE')
yb.conf.quiet = True
yb.conf.assumeyes = True
for pkg in self.pkgs:
try:
p = yb.reinstall(name = pkg)
except yum.Errors.ReinstallRemoveError:
p = yb.install(name = pkg)
p = p[0]
# I am... not 100% certain on this. Might be a better way?
fname = '{0}-{3}-{4}.{1}.rpm'.format(*p.pkgtup)
self.rpms[pkg] = os.path.join(yb.conf.downloaddir, fname)
yb.buildTransaction()
try:
yb.processTransaction()
except SystemExit:
pass # It keeps passing an exit because it's downloading only. Get it together, RH.
yb.closeRpmDB()
yb.close()
return()
def getFiles(self):
for rf in self.rpm_files:
# TODO: check if we have the rpm module and if so, rip pkg name from it? use that as key instead of rf?
self.rpms[os.path.basename(rf)] = os.path.abspath(os.path.expanduser(rf))
return()
def extractFiles(self):
# TODO: globbing or regex on self.paths?
2019-01-09 14:44:42 -05:00
# If we have yum, we can, TECHNICALLY, do this with:
# http://yum.baseurl.org/api/yum/rpmUtils/miscutils.html#rpmUtils.miscutils.rpm2cpio
# But nope. We can't selectively decompress members based on path with rpm2cpio-like funcs.
# We keep getting extraction artefacts, at least with legacy libarchive_c, so we use a hammer.
_curdir = os.getcwd()
_tempdir = tempfile.mkdtemp()
os.chdir(_tempdir)
for rpm_file in self.rpms:
rf = self.rpms[rpm_file]
if is_ctype:
if not is_legacy:
# ctype - extracts to pwd
with libarchive.file_reader(rf) as reader:
for entry in reader:
if self.paths and entry.path not in self.paths:
continue
if entry.isdir():
continue
fpath = os.path.join(self.dest_dir, rpm_file, entry.path)
if not os.path.isdir(os.path.dirname(fpath)):
os.makedirs(os.path.dirname(fpath))
with open(fpath, 'wb') as f:
for b in entry.get_blocks():
f.write(b)
else:
with libarchive.Archive(rf) as reader:
for entry in reader:
if (self.paths and entry.pathname not in self.paths) or (entry.isdir()):
continue
fpath = os.path.join(self.dest_dir, rpm_file, entry.pathname)
if not os.path.isdir(os.path.dirname(fpath)):
os.makedirs(os.path.dirname(fpath))
reader.readpath(fpath)
else:
# pyEasyArchive/"pypi/libarchive"
with lap.file_reader(rf) as reader:
for entry in reader:
if (self.paths and entry.pathname not in self.paths) or (entry.filetype.IFDIR):
continue
fpath = os.path.join(self.dest_dir, rpm_file, entry.pathname)
if not os.path.isdir(os.path.dirname(fpath)):
os.makedirs(os.path.dirname(fpath))
with open(fpath, 'wb') as f:
for b in entry.get_blocks():
f.write(b)
os.chdir(_curdir)
shutil.rmtree(_tempdir)
return()
def parseArgs():
args = argparse.ArgumentParser(description = ('This script allows you to extract files for a given package '
'{0}without installing any extra packages (such as yum-utils '
'for repoquery). '
'You must use at least one -r/--rpm{1}.').format(
('name(s) ' if has_yum else ''),
(', -p/--package, or both' if has_yum else '')))
args.add_argument('-d', '--dest-dir',
dest = 'dest_dir',
default = '/var/tmp/rpm_extract',
help = ('The destination for the extracted package file tree (in the format of '
'<dest_dir>/<pkg_nm>/<tree>). '
'Default: /var/tmp/rpm_extract'))
args.add_argument('-r', '--rpm',
dest = 'rpm_files',
metavar = 'PATH/TO/RPM',
action = 'append',
default = [],
help = ('If specified, use this RPM file instead of the system\'s RPM database. Can be '
'specified multiple times'))
if has_yum:
args.add_argument('-p', '--package',
dest = 'pkgs',
#nargs = 1,
metavar = 'PKGNAME',
action = 'append',
default = [],
help = ('If specified, restrict the list of packages to check against to only this package. '
'Can be specified multiple times. HIGHLY RECOMMENDED'))
args.add_argument('paths',
nargs = '+',
metavar = 'path/file/name.ext',
help = ('The path(s) of files to extract. If \'*\' is used, extract all files'))
return(args)
def main():
if has_argparse:
args = vars(parseArgs().parse_args())
args['rpm_files'] = [os.path.abspath(os.path.expanduser(i)) for i in args['rpm_files']]
if not any((args['rpm_files'], args['pkgs'])):
exit(('You have not specified any package files{0}.\n'
'This is so dumb we are bailing out.\n').format((' or package names') if has_yum else ''))
else:
raise RuntimeError('Please yum -y install python-argparse')
fe = FileExtractor(**args)
fe.extractFiles()
return()
if __name__ == '__main__':
main()