nix-config/modules/services/postgresql.nix

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{ config, lib, pkgs, ... }:
let
cfg = config.my.services.postgresql;
in
{
options.my.services.postgresql = with lib; {
enable = my.mkDisableOption "postgres configuration";
# Transient option to be enabled for migrations
upgradeScript = mkEnableOption "postgres upgrade script";
};
config = lib.mkMerge [
# Let other services enable postgres when they need it
(lib.mkIf cfg.enable {
services.postgresql = {
package = pkgs.postgresql_12;
};
})
# Taken from the manual
(lib.mkIf cfg.upgradeScript {
containers.temp-pg.config.services.postgresql = {
enable = true;
package = pkgs.postgresql_13;
};
environment.systemPackages =
let
newpg = config.containers.temp-pg.config.services.postgresql;
in
[
(pkgs.writeScriptBin "upgrade-pg-cluster" ''
#!/usr/bin/env bash
set -x
export OLDDATA="${config.services.postgresql.dataDir}"
export NEWDATA="${newpg.dataDir}"
export OLDBIN="${config.services.postgresql.package}/bin"
export NEWBIN="${newpg.package}/bin"
if [ "$OLDDATA" -ef "$NEWDATA" ]; then
echo "Cannot migrate to same data directory" >&2
exit 1
fi
install -d -m 0700 -o postgres -g postgres "$NEWDATA"
cd "$NEWDATA"
sudo -u postgres $NEWBIN/initdb -D "$NEWDATA"
systemctl stop postgresql # old one
sudo -u postgres $NEWBIN/pg_upgrade \
--old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
--old-bindir $OLDBIN --new-bindir $NEWBIN \
"$@"
'')
];
})
];
}