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# Copyright 2018-2022 Canonical, Ltd.
#
# 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/>.
import contextlib
import datetime
import grp
import os
import tempfile
import yaml
_DEF_PERMS = 0o640
_DEF_GROUP = 'adm'
@contextlib.contextmanager
def open_perms(filename, *, cmode=None):
if cmode is None:
cmode = _DEF_PERMS
tf = None
try:
dirname = os.path.dirname(filename)
os.makedirs(dirname, exist_ok=True)
tf = tempfile.NamedTemporaryFile(dir=dirname, delete=False, mode='w')
yield tf
tf.close()
os.chmod(tf.name, cmode)
if os.getuid() == 0:
os.chown(tf.name, -1, grp.getgrnam(_DEF_GROUP).gr_gid)
os.rename(tf.name, filename)
except OSError as e:
if tf is not None:
os.unlink(tf.name)
raise e
def write_file(filename, content, **kwargs):
with open_perms(filename, **kwargs) as tf:
tf.write(content)
def generate_config_yaml(filename, content, **kwargs):
with open_perms(filename, **kwargs) as tf:
now = datetime.datetime.utcnow()
tf.write(f'# Autogenerated by Subiquity: {now} UTC\n')
tf.write(yaml.dump(content))
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