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set.py
#!/usr/bin/python3 # # Copyright (C) 2020-2023 Canonical, Ltd. # Author: Lukas Märdian <slyon@ubuntu.com> # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; version 3. # # This program 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 General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. '''netplan set command line''' import tempfile import re import io from ..utils import NetplanCommand import netplan FALLBACK_FILENAME = '70-netplan-set.yaml' GLOBAL_KEYS = ['renderer', 'version'] class NetplanSet(NetplanCommand): def __init__(self): super().__init__(command_id='set', description='Add new setting by specifying a dotted key=value pair like ethernets.eth0.dhcp4=true', leaf=True) def run(self): self.parser.add_argument('key_value', type=str, help='The nested key=value pair in dotted format. Value can be NULL to delete a key.') self.parser.add_argument('--origin-hint', type=str, help='Can be used to help choose a name for the overwrite YAML file. \ A .yaml suffix will be appended automatically.') self.parser.add_argument('--root-dir', default='/', help='Overwrite configuration files in this root directory instead of /') self.func = self.command_set self.parse_args() self.run_command() def command_set(self): if self.origin_hint is not None and len(self.origin_hint) == 0: raise Exception('Invalid/empty origin-hint') if self.origin_hint: filename = '.'.join((self.origin_hint, 'yaml')) else: filename = None split = self.key_value.split('=', 1) if len(split) != 2: raise Exception('Invalid value specified') key, value = split if not key.startswith('network'): key = '.'.join(('network', key)) # Split the string into a list on the dot separators, and unescape the remaining dots yaml_path = [s.replace(r'\.', '.') for s in re.split(r'(?<!\\)\.', key)] parser = netplan.Parser() with tempfile.TemporaryFile() as tmp: netplan._create_yaml_patch(yaml_path, value, tmp) tmp.flush() # Load fields that are about to be deleted (e.g. some.setting=NULL) # Ignore those fields when parsing subsequent YAML files tmp.seek(0, io.SEEK_SET) parser.load_nullable_fields(tmp) # Parse the full, existing YAML config hierarchy parser.load_yaml_hierarchy(self.root_dir) # Load YAML patch, containing our update (new or deleted settings) tmp.seek(0, io.SEEK_SET) parser.load_yaml(tmp) # Validate the final parser state state = netplan.State() state.import_parser_results(parser) if filename: # only act on the output file (a.k.a. "origin-hint") parser_output_file = netplan.Parser() # Load fields that are about to be deleted ("some.setting=NULL") # Ignore those fields when parsing subsequent YAML files tmp.seek(0, io.SEEK_SET) parser_output_file.load_nullable_fields(tmp) # Load globals/netdefs that are to be ignored from the existing # YAML hierarchy, as our patch is supposed to override settings # in those netdefs via the output file. # Those netdefs and globals must end up in the output file # (a.k.a. "origin-hint", <filename>), have they been defined in # pre-existing YAML files or not. tmp.seek(0, io.SEEK_SET) parser_output_file._load_nullable_overrides(tmp, constraint=filename) # Parse the full YAML hierarchy and new patch, ignoring any # nullable overrides (netdefs/globals) from pre-existing files # and ignoring any nullable fields (settings to be deleted). # This way we can avoid updates to certain netdefs/globals to be # redirected into existing YAML files (defining those same # stanzas) or ignored, but have them written out to the single # output file. # XXX: The origin file of each individual YAML setting/stanza # should be tracked individually, to avoid this # double-parsing workaround (LP: #2003727) parser_output_file.load_yaml_hierarchy(self.root_dir) tmp.seek(0, io.SEEK_SET) parser_output_file.load_yaml(tmp) # Import the partial parser state, ignoring duplicated netdefs # from pre-existing YAML files, so we can force write the patch # contents to the output file or update this file if exists. state_output_file = netplan.State() state_output_file.import_parser_results(parser_output_file) state_output_file._write_yaml_file(filename, self.root_dir) else: state._update_yaml_hierarchy(FALLBACK_FILENAME, self.root_dir)