[type/__postgres_conf] New type based on ALTER SYSTEM command

This commit is contained in:
Beni Ruef 2020-12-03 18:48:04 +01:00 committed by Dennis Camera
parent 23e0da521c
commit c51d68a737
4 changed files with 150 additions and 0 deletions

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#!/bin/sh -e
# -*- mode: sh; indent-tabs-mode: t -*-
#
# 2019 Dennis Camera (dennis.camera at ssrq-sds-fds.ch)
# 2020 Beni Ruef (bernhard.ruef at ssrq-sds-fds.ch)
#
# This file is part of cdist.
#
# cdist 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, either version 3 of the License, or
# (at your option) any later version.
#
# cdist 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 cdist. If not, see <http://www.gnu.org/licenses/>.
#
os=$(cat "${__global}/explorer/os")
state_should=$(cat "${__object}/parameter/state")
if [ "${state_should}" != 'present' ] && [ "${state_should}" != 'absent' ]
then
echo "Invalid state '${state_should}'." \
'Only "present" and "absent" are acceptable' >&2
exit 1
fi
if [ "${state_should}" = 'present' ] && [ ! -f "${__object}/parameter/value" ]
then
echo 'Missing required parameter "value"' >&2
exit 1
fi
# Parameters
conf_name="${__object_id}"
if [ -f "${__object}/parameter/value" ]
then
conf_value=$(cat "${__object}/parameter/value")
fi
if [ "${state_should}" = 'present' ]
then
set_command="ALTER SYSTEM SET ${conf_name} = '${conf_value}'"
check_command="SHOW ${conf_name}"
else
set_command="ALTER SYSTEM SET ${conf_name} = DEFAULT"
fi
case $os
in
openbsd|devuan)
case $os
in
openbsd)
postgres_user='_postgresql'
restart_command='/etc/rc.d/postgresql restart'
;;
devuan)
postgres_user='postgres'
restart_command='/etc/init.d/postgresql restart'
;;
esac
# needs two separate psql commands because ALTER SYSTEM
# cannot run inside a transaction block
cat <<-EOF
su - ${postgres_user} -c "psql postgres -twAc \
\"${set_command}\""
su - ${postgres_user} -c "psql postgres -twAc \
\"SELECT pg_reload_conf()\""
EOF
# check success (makes only sense if setting to a non-default value)
# and restart server if needed
if [ "${state_should}" = 'present' ]
then
cat <<-EOF
if [ \$(su - ${postgres_user} -c "psql postgres -twAc \"SHOW ${conf_name}\"") != '${conf_value}' ]
then
${restart_command}
fi
EOF
fi
;;
*)
echo "Unsupported OS: ${os}" >&2
exit 1
;;
esac

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cdist-type__postgres_conf(7)
============================
Configure a PostgreSQL server.
NOTE: This type might need to be run multiple times to apply all bits of the
configuration due to ordering requirements.
SSRQ <cdist--@--ssrq-sds-fds.ch>
DESCRIPTION
-----------
Configure a PostgreSQL server using ALTER SYSTEM.
REQUIRED PARAMETERS
-------------------
value
The value to setup (can be omitted when state is set to "absent").
OPTIONAL PARAMETERS
-------------------
state
"present" or "absent". Defaults to "present".
BOOLEAN PARAMETERS
------------------
None.
EXAMPLES
--------
.. code-block:: sh
# set timezone
__postgres_conf timezone --value Europe/Zurich
# reset maximum number of concurrent connections to default (normally 100)
__postgres_conf max_connections --state absent
SEE ALSO
--------
- `cdist-type(7) <cdist-type.html>`_
COPYING
-------
Copyright \(C) 2020 SSRQ (www.ssrq-sds-fds.ch).
Free use of this software is granted under the terms
of the GNU General Public License version 3 (GPLv3).

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present

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state
value