366 lines
12 KiB
Nix
366 lines
12 KiB
Nix
{ config, lib, pkgs, ... }:
|
||
|
||
with lib;
|
||
|
||
let
|
||
|
||
cfg = config.services.postgresql;
|
||
|
||
# see description of extraPlugins
|
||
postgresqlAndPlugins = pg:
|
||
if cfg.extraPlugins == [] then pg
|
||
else pkgs.buildEnv {
|
||
name = "postgresql-and-plugins-${(builtins.parseDrvName pg.name).version}";
|
||
paths = [ pg pg.lib ] ++ cfg.extraPlugins;
|
||
buildInputs = [ pkgs.makeWrapper ];
|
||
postBuild =
|
||
''
|
||
mkdir -p $out/bin
|
||
rm $out/bin/{pg_config,postgres,pg_ctl}
|
||
cp --target-directory=$out/bin ${pg}/bin/{postgres,pg_config,pg_ctl}
|
||
wrapProgram $out/bin/postgres --set NIX_PGLIBDIR $out/lib
|
||
'';
|
||
};
|
||
|
||
postgresql = postgresqlAndPlugins cfg.package;
|
||
|
||
# The main PostgreSQL configuration file.
|
||
configFile = pkgs.writeText "postgresql.conf"
|
||
''
|
||
hba_file = '${pkgs.writeText "pg_hba.conf" cfg.authentication}'
|
||
ident_file = '${pkgs.writeText "pg_ident.conf" cfg.identMap}'
|
||
log_destination = 'stderr'
|
||
listen_addresses = '${if cfg.enableTCPIP then "*" else "localhost"}'
|
||
port = ${toString cfg.port}
|
||
${cfg.extraConfig}
|
||
'';
|
||
|
||
in
|
||
|
||
{
|
||
|
||
###### interface
|
||
|
||
options = {
|
||
|
||
services.postgresql = {
|
||
|
||
enable = mkOption {
|
||
type = types.bool;
|
||
default = false;
|
||
description = ''
|
||
Whether to run PostgreSQL.
|
||
'';
|
||
};
|
||
|
||
package = mkOption {
|
||
type = types.package;
|
||
example = literalExample "pkgs.postgresql_9_6";
|
||
description = ''
|
||
PostgreSQL package to use.
|
||
'';
|
||
};
|
||
|
||
port = mkOption {
|
||
type = types.int;
|
||
default = 5432;
|
||
description = ''
|
||
The port on which PostgreSQL listens.
|
||
'';
|
||
};
|
||
|
||
dataDir = mkOption {
|
||
type = types.path;
|
||
example = "/var/lib/postgresql/9.6";
|
||
description = ''
|
||
Data directory for PostgreSQL.
|
||
'';
|
||
};
|
||
|
||
authentication = mkOption {
|
||
type = types.lines;
|
||
default = "";
|
||
description = ''
|
||
Defines how users authenticate themselves to the server. By
|
||
default, "trust" access to local users will always be granted
|
||
along with any other custom options. If you do not want this,
|
||
set this option using "lib.mkForce" to override this
|
||
behaviour.
|
||
'';
|
||
};
|
||
|
||
identMap = mkOption {
|
||
type = types.lines;
|
||
default = "";
|
||
description = ''
|
||
Defines the mapping from system users to database users.
|
||
'';
|
||
};
|
||
|
||
initialScript = mkOption {
|
||
type = types.nullOr types.path;
|
||
default = null;
|
||
description = ''
|
||
A file containing SQL statements to execute on first startup.
|
||
'';
|
||
};
|
||
|
||
ensureDatabases = mkOption {
|
||
type = types.listOf types.str;
|
||
default = [];
|
||
description = ''
|
||
Ensures that the specified databases exist.
|
||
This option will never delete existing databases, especially not when the value of this
|
||
option is changed. This means that databases created once through this option or
|
||
otherwise have to be removed manually.
|
||
'';
|
||
example = [
|
||
"gitea"
|
||
"nextcloud"
|
||
];
|
||
};
|
||
|
||
ensureUsers = mkOption {
|
||
type = types.listOf (types.submodule {
|
||
options = {
|
||
name = mkOption {
|
||
type = types.str;
|
||
description = ''
|
||
Name of the user to ensure.
|
||
'';
|
||
};
|
||
ensurePermissions = mkOption {
|
||
type = types.attrsOf types.str;
|
||
default = {};
|
||
description = ''
|
||
Permissions to ensure for the user, specified as an attribute set.
|
||
The attribute names specify the database and tables to grant the permissions for.
|
||
The attribute values specify the permissions to grant. You may specify one or
|
||
multiple comma-separated SQL privileges here.
|
||
|
||
For more information on how to specify the target
|
||
and on which privileges exist, see the
|
||
<link xlink:href="https://www.postgresql.org/docs/current/sql-grant.html">GRANT syntax</link>.
|
||
The attributes are used as <code>GRANT ''${attrName} ON ''${attrValue}</code>.
|
||
'';
|
||
example = literalExample ''
|
||
{
|
||
"DATABASE nextcloud" = "ALL PRIVILEGES";
|
||
"ALL TABLES IN SCHEMA public" = "ALL PRIVILEGES";
|
||
}
|
||
'';
|
||
};
|
||
};
|
||
});
|
||
default = [];
|
||
description = ''
|
||
Ensures that the specified users exist and have at least the ensured permissions.
|
||
The PostgreSQL users will be identified using peer authentication. This authenticates the Unix user with the
|
||
same name only, and that without the need for a password.
|
||
This option will never delete existing users or remove permissions, especially not when the value of this
|
||
option is changed. This means that users created and permissions assigned once through this option or
|
||
otherwise have to be removed manually.
|
||
'';
|
||
example = literalExample ''
|
||
[
|
||
{
|
||
name = "nextcloud";
|
||
ensurePermissions = {
|
||
"DATABASE nextcloud" = "ALL PRIVILEGES";
|
||
};
|
||
}
|
||
{
|
||
name = "superuser";
|
||
ensurePermissions = {
|
||
"ALL TABLES IN SCHEMA public" = "ALL PRIVILEGES";
|
||
};
|
||
}
|
||
]
|
||
'';
|
||
};
|
||
|
||
enableTCPIP = mkOption {
|
||
type = types.bool;
|
||
default = false;
|
||
description = ''
|
||
Whether PostgreSQL should listen on all network interfaces.
|
||
If disabled, the database can only be accessed via its Unix
|
||
domain socket or via TCP connections to localhost.
|
||
'';
|
||
};
|
||
|
||
extraPlugins = mkOption {
|
||
type = types.listOf types.path;
|
||
default = [];
|
||
example = literalExample "[ (pkgs.postgis.override { postgresql = pkgs.postgresql_9_4; }) ]";
|
||
description = ''
|
||
When this list contains elements a new store path is created.
|
||
PostgreSQL and the elements are symlinked into it. Then pg_config,
|
||
postgres and pg_ctl are copied to make them use the new
|
||
$out/lib directory as pkglibdir. This makes it possible to use postgis
|
||
without patching the .sql files which reference $libdir/postgis-1.5.
|
||
'';
|
||
# Note: the duplication of executables is about 4MB size.
|
||
# So a nicer solution was patching postgresql to allow setting the
|
||
# libdir explicitely.
|
||
};
|
||
|
||
extraConfig = mkOption {
|
||
type = types.lines;
|
||
default = "";
|
||
description = "Additional text to be appended to <filename>postgresql.conf</filename>.";
|
||
};
|
||
|
||
recoveryConfig = mkOption {
|
||
type = types.nullOr types.lines;
|
||
default = null;
|
||
description = ''
|
||
Contents of the <filename>recovery.conf</filename> file.
|
||
'';
|
||
};
|
||
superUser = mkOption {
|
||
type = types.str;
|
||
default= if versionAtLeast config.system.stateVersion "17.09" then "postgres" else "root";
|
||
internal = true;
|
||
description = ''
|
||
NixOS traditionally used 'root' as superuser, most other distros use 'postgres'.
|
||
From 17.09 we also try to follow this standard. Internal since changing this value
|
||
would lead to breakage while setting up databases.
|
||
'';
|
||
};
|
||
};
|
||
|
||
};
|
||
|
||
|
||
###### implementation
|
||
|
||
config = mkIf config.services.postgresql.enable {
|
||
|
||
services.postgresql.package =
|
||
# Note: when changing the default, make it conditional on
|
||
# ‘system.stateVersion’ to maintain compatibility with existing
|
||
# systems!
|
||
mkDefault (if versionAtLeast config.system.stateVersion "17.09" then pkgs.postgresql_9_6
|
||
else if versionAtLeast config.system.stateVersion "16.03" then pkgs.postgresql_9_5
|
||
else pkgs.postgresql_9_4);
|
||
|
||
services.postgresql.dataDir =
|
||
mkDefault (if versionAtLeast config.system.stateVersion "17.09" then "/var/lib/postgresql/${config.services.postgresql.package.psqlSchema}"
|
||
else "/var/db/postgresql");
|
||
|
||
services.postgresql.authentication = mkAfter
|
||
''
|
||
# Generated file; do not edit!
|
||
local all all ident
|
||
host all all 127.0.0.1/32 md5
|
||
host all all ::1/128 md5
|
||
'';
|
||
|
||
users.users.postgres =
|
||
{ name = "postgres";
|
||
uid = config.ids.uids.postgres;
|
||
group = "postgres";
|
||
description = "PostgreSQL server user";
|
||
home = "${cfg.dataDir}";
|
||
useDefaultShell = true;
|
||
};
|
||
|
||
users.groups.postgres.gid = config.ids.gids.postgres;
|
||
|
||
environment.systemPackages = [ postgresql ];
|
||
|
||
systemd.services.postgresql =
|
||
{ description = "PostgreSQL Server";
|
||
|
||
wantedBy = [ "multi-user.target" ];
|
||
after = [ "network.target" ];
|
||
|
||
environment.PGDATA = cfg.dataDir;
|
||
|
||
path = [ postgresql ];
|
||
|
||
preStart =
|
||
''
|
||
# Create data directory.
|
||
if ! test -e ${cfg.dataDir}/PG_VERSION; then
|
||
mkdir -m 0700 -p ${cfg.dataDir}
|
||
rm -f ${cfg.dataDir}/*.conf
|
||
chown -R postgres:postgres ${cfg.dataDir}
|
||
fi
|
||
''; # */
|
||
|
||
script =
|
||
''
|
||
# Initialise the database.
|
||
if ! test -e ${cfg.dataDir}/PG_VERSION; then
|
||
initdb -U ${cfg.superUser}
|
||
# See postStart!
|
||
touch "${cfg.dataDir}/.first_startup"
|
||
fi
|
||
ln -sfn "${configFile}" "${cfg.dataDir}/postgresql.conf"
|
||
${optionalString (cfg.recoveryConfig != null) ''
|
||
ln -sfn "${pkgs.writeText "recovery.conf" cfg.recoveryConfig}" \
|
||
"${cfg.dataDir}/recovery.conf"
|
||
''}
|
||
|
||
exec postgres
|
||
'';
|
||
|
||
serviceConfig =
|
||
{ ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
|
||
User = "postgres";
|
||
Group = "postgres";
|
||
PermissionsStartOnly = true;
|
||
RuntimeDirectory = "postgresql";
|
||
Type = if lib.versionAtLeast cfg.package.version "9.6"
|
||
then "notify"
|
||
else "simple";
|
||
|
||
# Shut down Postgres using SIGINT ("Fast Shutdown mode"). See
|
||
# http://www.postgresql.org/docs/current/static/server-shutdown.html
|
||
KillSignal = "SIGINT";
|
||
KillMode = "mixed";
|
||
|
||
# Give Postgres a decent amount of time to clean up after
|
||
# receiving systemd's SIGINT.
|
||
TimeoutSec = 120;
|
||
};
|
||
|
||
# Wait for PostgreSQL to be ready to accept connections.
|
||
postStart =
|
||
''
|
||
PSQL="${pkgs.sudo}/bin/sudo -u ${cfg.superUser} psql --port=${toString cfg.port}"
|
||
|
||
while ! $PSQL -d postgres -c "" 2> /dev/null; do
|
||
if ! kill -0 "$MAINPID"; then exit 1; fi
|
||
sleep 0.1
|
||
done
|
||
|
||
if test -e "${cfg.dataDir}/.first_startup"; then
|
||
${optionalString (cfg.initialScript != null) ''
|
||
$PSQL -f "${cfg.initialScript}" -d postgres
|
||
''}
|
||
rm -f "${cfg.dataDir}/.first_startup"
|
||
fi
|
||
'' + optionalString (cfg.ensureDatabases != []) ''
|
||
${concatMapStrings (database: ''
|
||
$PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${database}'" | grep -q 1 || $PSQL -tAc "CREATE DATABASE ${database}"
|
||
'') cfg.ensureDatabases}
|
||
'' + ''
|
||
${concatMapStrings (user: ''
|
||
$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${user.name}'" | grep -q 1 || $PSQL -tAc "CREATE USER ${user.name}"
|
||
${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
|
||
$PSQL -tAc "GRANT ${permission} ON ${database} TO ${user.name}"
|
||
'') user.ensurePermissions)}
|
||
'') cfg.ensureUsers}
|
||
'';
|
||
|
||
unitConfig.RequiresMountsFor = "${cfg.dataDir}";
|
||
};
|
||
|
||
};
|
||
|
||
meta.doc = ./postgresql.xml;
|
||
meta.maintainers = with lib.maintainers; [ thoughtpolice ];
|
||
}
|