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Viewing / Editing File: package_manager.py

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import os
import subprocess


class PackageManagerError(Exception):
    def __init__(self, err):
        self.returncode = err.returncode
        self.stdout = err.stdout.decode()
        self.stderr = err.stderr.decode()


class PackageManager(object):
    binary = None
    kernel_name = None
    kernel_dev_name = None
    list_installed_cmd = None
    _kernel_ver = None

    @property
    def kernel_ver(self):
        if not self._kernel_ver:
            self._kernel_ver = self._exec('uname', '-r').strip()

        return self._kernel_ver

    @property
    def kernel_name_full(self):
        return '-'.join([self.kernel_name, self.kernel_ver])

    @property
    def kernel_dev_name_full(self):
        return '-'.join([self.kernel_dev_name, self.kernel_ver])

    def _exec(self, *args):
        try:
            process = subprocess.run(args, stdout=subprocess.PIPE,
                                     stderr=subprocess.PIPE, check=True)
        except subprocess.CalledProcessError as err:
            raise PackageManagerError(err)

        return process.stdout.decode()

    def install(self, *args):
        return self._exec(self.binary, 'install', '-y', *args)

    def install_kernel_dev(self, *args):
        return self.install(self.kernel_dev_name_full, *args)

    def is_package_installed(self, package):
        try:
            self._exec(*self.list_installed_cmd, package)
        except PackageManagerError:
            return False

        return True

    def is_kernel_dev_installed(self):
        return self.is_package_installed(self.kernel_dev_name_full)


_registry = []


def register(cls):
    if issubclass(cls, PackageManager) and cls is not PackageManager:
        _registry.append(cls)
    return cls


def detect():
    for provider in _registry:
        if os.path.exists(provider.binary):
            return provider()
    raise OSError("Can't detect package manager")


@register
class Deb(PackageManager):
    binary = '/usr/bin/apt-get'
    kernel_name = 'linux-image'
    kernel_dev_name = 'linux-headers'
    list_installed_cmd = '/usr/bin/dpkg', '--list'


@register
class Rpm(PackageManager):
    binary = '/usr/bin/yum'
    kernel_name = 'kernel'
    kernel_plus_name = 'kernel-plus'
    kernel_dev_name = '{}-devel'
    list_installed_cmd = '/usr/bin/yum', 'list', 'installed'

    def __init__(self):
        if 'plus' in self.kernel_ver and \
                self.is_package_installed(self.kernel_plus_name):
            self.kernel_name = self.kernel_plus_name

        self.kernel_dev_name = self.kernel_dev_name.format(self.kernel_name)
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