nix-home/modules/cloud/postgresql/default.nix

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{ pkgs, config, lib, ... }:
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with lib;
let
cfg = config.cloud.postgresql;
# From a database name, create an "ensureUser"
# entry with the same name and assign all permissions
# to that database.
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userFromDatabase = databaseName: {
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name = databaseName;
ensurePermissions = {
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"DATABASE \"${databaseName}\"" = "ALL PRIVILEGES";
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};
};
in
{
options.cloud.postgresql.databases = mkOption {
type = types.listOf types.str;
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default = [ ];
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description = ''
The list of databases to be created.
An user with the same name
and full access to the database will be created.
'';
};
# PostgreSQL settings.
config.services.postgresql = {
enable = true;
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package = pkgs.postgresql_15;
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ensureDatabases = cfg.databases;
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ensureUsers = (map userFromDatabase cfg.databases) ++ [{
name = "root";
ensurePermissions = { "ALL TABLES IN SCHEMA public" = "ALL PRIVILEGES"; };
}];
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};
# Backup settings
config.services.postgresqlBackup = {
enable = true;
};
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# Upgrade
config.environment.systemPackages = [
(
let
# XXX specify the postgresql package you'd like to upgrade to.
# Do not forget to list the extensions you need.
newPostgres = pkgs.postgresql_15.withPackages (pp: [
# pp.plv8
]);
in
pkgs.writeScriptBin "upgrade-pg-cluster" ''
set -eux
# XXX it's perhaps advisable to stop all services that depend on postgresql
systemctl stop postgresql
export NEWDATA="/var/lib/postgresql/${newPostgres.psqlSchema}"
export NEWBIN="${newPostgres}/bin"
export OLDDATA="${config.services.postgresql.dataDir}"
export OLDBIN="${config.services.postgresql.package}/bin"
install -d -m 0700 -o postgres -g postgres "$NEWDATA"
cd "$NEWDATA"
sudo -u postgres $NEWBIN/initdb -D "$NEWDATA"
sudo -u postgres $NEWBIN/pg_upgrade \
--old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
--old-bindir $OLDBIN --new-bindir $NEWBIN \
"$@"
''
)
];
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}