[Kimchi-devel] [PATCH 1/3 v3] Adding yumparser module

This module contains: - functions to write and delete YUM repositories using the .repo files from the filesystem directly, without the need of an external API. - a function to return the software update package list by parsing the output of $yum check-update Signed-off-by: Daniel Henrique Barboza <dhbarboza82(a)gmail.com&gt; --- src/kimchi/yumparser.py | 271 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 271 insertions(+) create mode 100644 src/kimchi/yumparser.py diff --git a/src/kimchi/yumparser.py b/src/kimchi/yumparser.py new file mode 100644 index 0000000..af0396b --- /dev/null +++ b/src/kimchi/yumparser.py @@ -0,0 +1,271 @@ +# +# Project Kimchi +# +# Copyright IBM, Corp. 2015 +# +# This library is free software; you can redistribute it and/or +# modify it under the terms of the GNU Lesser General Public +# License as published by the Free Software Foundation; either +# version 2.1 of the License, or (at your option) any later version. +# +# This library is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public +# License along with this library; if not, write to the Free Software +# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA +import subprocess + +from os import listdir +from os.path import isfile, splitext + + +class YumRepoObject(object): + + def _set_base_URL(self, strvalue): + self.baseurl = strvalue + + def _set_enabled(self, strvalue): + self.enabled = (strvalue == '1') + + def _set_gpgcheck(self, strvalue): + self.gpgcheck = (strvalue == '1') + + def _set_gpgkey(self, strvalue): + self.gpgkey = strvalue + + def _set_metalink(self, strvalue): + self.metalink = strvalue + + def _set_mirrorlist(self, strvalue): + self.mirrorlist = strvalue + + def _set_name(self, strvalue): + self.name = strvalue + + def __init__(self, repo_id, repofile): + self.repo_id = repo_id + self.name = None + self.baseurl = None + self.enabled = True + self.gpgcheck = True + self.gpgkey = None + self.metalink = None + self.mirrorlist = None + self.repofile = repofile + self.attr_setters = {'baseurl': self._set_base_URL, + 'enabled': self._set_enabled, + 'gpgcheck': self._set_gpgcheck, + 'gpgkey': self._set_gpgkey, + 'name': self._set_name, + 'metalink': self._set_metalink, + 'mirrorlist': self._set_mirrorlist} + + def set_attribute(self, key, value): + attr_setter = self.attr_setters.get(key) + if attr_setter: + return attr_setter(value) + + def get_attribute_str(self, key): + if key not in self.attr_setters.keys(): + return None + if key == 'enabled' or key == 'gpgcheck': + str_value = '1' if getattr(self, key) is True else '0' + else: + str_value = getattr(self, key) + + if str_value is None: + return None + + return key + '=' + str_value + + def get_attributes(self): + return self.attr_setters.keys() + + def enable(self): + self.enabled = True + + def disable(self): + self.enabled = False + + def __str__(self): + str_obj = '[' + self.repo_id + ']' + '\n' + for key in self.get_attributes(): + if self.get_attribute_str(key) is not None: + str_obj += self.get_attribute_str(key) + '\n' + return str_obj + + +def get_repo_files(): + def _is_repository_file(f): + _, f_extension = splitext(f) + return isfile(f) and (f_extension == '.repo') + + YUM_REPO_DIR = '/etc/yum.repos.d' + return [YUM_REPO_DIR+'/'+f for f in listdir(YUM_REPO_DIR) + if _is_repository_file(YUM_REPO_DIR+'/'+f)] + + +def _ignore_line_repo_file(line): + return line.startswith("#") or '=' not in line + + +def _get_repos_from_file(repo_file): + repos_from_file = {} + current_repo = None + current_repo_id = None + with open(repo_file) as f: + for line in f.readlines(): + line = line.strip() + if line.startswith("["): + if current_repo is not None: + repos_from_file[current_repo_id] = current_repo + current_repo_id = line.strip('[]') + current_repo = YumRepoObject(current_repo_id, repo_file) + continue + if _ignore_line_repo_file(line): + continue + key, value = line.split('=', 1) + key = key.strip() + value = value.strip() + current_repo.set_attribute(key, value) + + # add the last repo from file + repos_from_file[current_repo_id] = current_repo + + return repos_from_file + + +def get_yum_repositories(): + repo_files = get_repo_files() + repos = {} + for yum_repo in repo_files: + repos.update(_get_repos_from_file(yum_repo)) + + return repos + + +def _retrieve_repo_line_index(data, repo): + repo_entry = '[' + repo.repo_id + ']\n' + try: + repo_index = data.index(repo_entry) + except: + return None + return repo_index + + +def _update_repo_file_data(data, repo, repo_index): + remaining_repo_attrs = repo.get_attributes() + + for i in range(repo_index + 1, len(data)): + line = data[i].strip() + if line.startswith('['): + break + if _ignore_line_repo_file(line): + continue + key, _ = line.split('=', 1) + key = key.strip() + attr_str = repo.get_attribute_str(key) + if attr_str is None: + continue + remaining_repo_attrs.remove(key) + data[i] = attr_str + '\n' + + for attr in remaining_repo_attrs: + attr_str = repo.get_attribute_str(attr) + if attr_str is None: + continue + data.insert(repo_index+1, attr_str + '\n') + + return data + + +def write_repo_to_file(repo): + with open(repo.repofile) as f: + data = f.readlines() + + repo_index = _retrieve_repo_line_index(data, repo) + if repo_index is None: + return + + data = _update_repo_file_data(data, repo, repo_index) + + with open(repo.repofile, 'w') as f: + f.writelines(data) + + +def _get_last_line_repo(data, repo_index): + stop_delete_index = None + for i in range(repo_index+1, len(data)): + line = data[i].strip() + if line.startswith('['): + stop_delete_index = i - 1 + break + if stop_delete_index is None: + stop_delete_index = len(data) - 1 + + return stop_delete_index + + +def _remove_repo_file_data(data, repo_index): + last_line_repo = _get_last_line_repo(data, repo_index) + for i in range(last_line_repo, repo_index - 1, -1): + data.pop(i) + return data + + +def delete_repo_from_file(repo): + with open(repo.repofile) as f: + data = f.readlines() + + repo_index = _retrieve_repo_line_index(data, repo) + if repo_index is None: + return + + data = _remove_repo_file_data(data, repo_index) + + with open(repo.repofile, 'w') as f: + f.writelines(data) + + +class YumUpdatePackageObject(object): + + def __init__(self, name, arch, version, repo): + self.name = name + self.arch = arch + self.version = version + self.ui_from_repo = repo + + +def _get_yum_checkupdate_output(): + cmd = ['yum', 'check-update', '-d0'] + yum_update_cmd = subprocess.Popen(cmd, + stdout=subprocess.PIPE, + stderr=subprocess.PIPE) + out, error = yum_update_cmd.communicate() + if error != '': + return None + + return out.split() + + +def get_yum_packages_list_update(): + yum_checkupdate_output = _get_yum_checkupdate_output() + if yum_checkupdate_output is None: + return None + + packages = [] + index = 0 + while index < len(yum_checkupdate_output): + name_arch = yum_checkupdate_output[index] + index += 1 + version = yum_checkupdate_output[index] + index += 1 + repo = yum_checkupdate_output[index] + index += 1 + name, arch = name_arch.rsplit('.', 1) + packages.append(YumUpdatePackageObject(name, arch, version, repo)) + + return packages -- 2.1.0