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postgresql_lang – Adds, removes or changes procedural languages with a PostgreSQL database

Synopsis

  • Adds, removes or changes procedural languages with a PostgreSQL database.
  • This module allows you to add a language, remote a language or change the trust relationship with a PostgreSQL database.
  • The module can be used on the machine where executed or on a remote host.
  • When removing a language from a database, it is possible that dependencies prevent the database from being removed. In that case, you can specify casade to automatically drop objects that depend on the language (such as functions in the language).
  • In case the language can’t be deleted because it is required by the database system, you can specify fail_on_drop=no to ignore the error.
  • Be carefull when marking a language as trusted since this could be a potential security breach. Untrusted languages allow only users with the PostgreSQL superuser privilege to use this language to create new functions.
  • For more information about PostgreSQL languages see the official documentation https://www.postgresql.org/docs/current/sql-createlanguage.html, https://www.postgresql.org/docs/current/sql-alterlanguage.html, https://www.postgresql.org/docs/current/sql-droplanguage.html.

Requirements

The below requirements are needed on the host that executes this module.

  • psycopg2

Parameters

Parameter Choices/Defaults Comments
ca_cert
string
added in 2.8
Specifies the name of a file containing SSL certificate authority (CA) certificate(s).
If the file exists, the server's certificate will be verified to be signed by one of these authorities.

aliases: ssl_rootcert
cascade
boolean
    Choices:
  • no ←
  • yes
When dropping a language, also delete object that depend on this language.
Only used when state=absent.
db
string
Name of database to connect to and where the language will be added, removed or changed.

aliases: login_db
fail_on_drop
boolean
    Choices:
  • no
  • yes ←
If yes, fail when removing a language. Otherwise just log and continue.
In some cases, it is not possible to remove a language (used by the db-system).
When dependencies block the removal, consider using cascade.
force_trust
boolean
    Choices:
  • no ←
  • yes
Marks the language as trusted, even if it's marked as untrusted in pg_pltemplate.
Use with care!
lang
string / required
Name of the procedural language to add, remove or change.

aliases: name
login_host
string
Host running the database.
login_password
string
The password used to authenticate with.
login_unix_socket
string
added in 2.8
Path to a Unix domain socket for local connections.
login_user
string
Default:
"postgres"
The username used to authenticate with.
port
integer
Default:
5432
Database port to connect to.

aliases: login_port
session_role
string
added in 2.8
Switch to session_role after connecting.
The specified session_role must be a role that the current login_user is a member of.
Permissions checking for SQL commands is carried out as though the session_role were the one that had logged in originally.
ssl_mode
string
added in 2.8
    Choices:
  • allow
  • disable
  • prefer ←
  • require
  • verify-ca
  • verify-full
Determines whether or with what priority a secure SSL TCP/IP connection will be negotiated with the server.
See https://www.postgresql.org/docs/current/static/libpq-ssl.html for more information on the modes.
Default of prefer matches libpq default.
state
string
    Choices:
  • absent
  • present ←
The state of the language for the selected database.
trust
boolean
    Choices:
  • no ←
  • yes
Make this language trusted for the selected db.

Notes

Note

  • The default authentication assumes that you are either logging in as or sudo’ing to the postgres account on the host.
  • To avoid “Peer authentication failed for user postgres” error, use postgres user as a become_user.
  • This module uses psycopg2, a Python PostgreSQL database adapter. You must ensure that psycopg2 is installed on the host before using this module.
  • If the remote host is the PostgreSQL server (which is the default case), then PostgreSQL must also be installed on the remote host.
  • For Ubuntu-based systems, install the postgresql, libpq-dev, and python-psycopg2 packages on the remote host before using this module.
  • The ca_cert parameter requires at least Postgres version 8.4 and psycopg2 version 2.4.3.

Examples

- name: Add language pltclu to database testdb if it doesn't exist
  postgresql_lang: db=testdb lang=pltclu state=present

# Add language pltclu to database testdb if it doesn't exist and mark it as trusted.
# Marks the language as trusted if it exists but isn't trusted yet.
# force_trust makes sure that the language will be marked as trusted
- name: Add language pltclu to database testdb if it doesn't exist and mark it as trusted
  postgresql_lang:
    db: testdb
    lang: pltclu
    state: present
    trust: yes
    force_trust: yes

- name: Remove language pltclu from database testdb
  postgresql_lang:
    db: testdb
    lang: pltclu
    state: absent

- name: Remove language pltclu from database testdb and remove all dependencies
  postgresql_lang:
    db: testdb
    lang: pltclu
    state: absent
    cascade: yes

- name: Remove language c from database testdb but ignore errors if something prevents the removal
  postgresql_lang:
    db: testdb
    lang: pltclu
    state: absent
    fail_on_drop: no

Return Values

Common return values are documented here, the following are the fields unique to this module:

Key Returned Description
queries
list
added in 2.8
always
List of executed queries.

Sample:
['CREATE LANGUAGE "acme"']


Status

Authors

  • Jens Depuydt (@jensdepuydt)
  • Thomas O’Donnell (@andytom)

Hint

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