80 lines
2.6 KiB
Nix
80 lines
2.6 KiB
Nix
{ config, lib, pkgs, ... }:
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let
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cfg = config.my.services.postgresql;
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in
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{
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options.my.services.postgresql = with lib; {
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enable = my.mkDisableOption "postgres configuration";
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# Transient option to be enabled for migrations
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upgradeScript = mkEnableOption "postgres upgrade script";
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};
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config = lib.mkMerge [
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# Let other services enable postgres when they need it
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(lib.mkIf cfg.enable {
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services.postgresql = {
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package = pkgs.postgresql_13;
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};
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})
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# Only persist directory if the actual service is enabled
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(lib.mkIf config.services.postgresql.enable {
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my.system.persist.directories = [
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config.services.postgresql.dataDir
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];
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})
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# Taken from the manual
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(lib.mkIf cfg.upgradeScript {
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environment.systemPackages =
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let
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pgCfg = config.services.postgresql;
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newPackage' = pkgs.postgresql_13;
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oldPackage = if pgCfg.enableJIT then pgCfg.package.withJIT else pgCfg.package;
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oldData = pgCfg.dataDir;
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oldBin = "${if pgCfg.extraPlugins == [] then oldPackage else oldPackage.withPackages pgCfg.extraPlugins}/bin";
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newPackage = if pgCfg.enableJIT then newPackage'.withJIT else newPackage';
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newData = "/var/lib/postgresql/${newPackage.psqlSchema}";
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newBin = "${if pgCfg.extraPlugins == [] then newPackage else newPackage.withPackages pgCfg.extraPlugins}/bin";
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in
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[
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(pkgs.writeScriptBin "upgrade-pg-cluster" ''
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#!/usr/bin/env bash
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set -eux
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export OLDDATA="${oldData}"
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export NEWDATA="${newData}"
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export OLDBIN="${oldBin}"
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export NEWBIN="${newBin}"
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if [ "$OLDDATA" -ef "$NEWDATA" ]; then
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echo "Cannot migrate to same data directory" >&2
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exit 1
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fi
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install -d -m 0700 -o postgres -g postgres "$NEWDATA"
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cd "$NEWDATA"
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sudo -u postgres "$NEWBIN/initdb" -D "$NEWDATA"
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systemctl stop postgresql # old one
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sudo -u postgres "$NEWBIN/pg_upgrade" \
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--old-datadir "$OLDDATA" --new-datadir "$NEWDATA" \
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--old-bindir "$OLDBIN" --new-bindir "$NEWBIN" \
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"$@"
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cat << EOF
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Run the following commands after setting:
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services.postgresql.package = pkgs.postgresql_${lib.versions.major newPackage.version}
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sudo -u postgres vacuumdb --all --analyze-in-stages
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${newData}/delete_old_cluster.sh
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EOF
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'')
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];
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})
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];
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}
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