fix script

lib.nix

@@ -115,9 +115,8 @@ in
         set -euo pipefail
         export PATH=${package}/bin:${pkgs.coreutils}/bin
         POSTGRES_RUN_INITIAL_SCRIPT="false"
-        if [[ ! -d "${data_dir}" ]]; then
-          
-          initdb -D ${data_dir} --no-instructions
+        if [[ ! -d "$PGDATA" ]]; then
+          initdb --no-instructions
           POSTGRES_RUN_INITIAL_SCRIPT="true"
           echo
           echo "PostgreSQL initdb process completed"
@@ -128,16 +127,8 @@ in
           echo
           echo "PostgreSQL is setting up the initial database"
           echo
-          if [[ -z "''${PGHOST+x}" ]]; then
-            OLDPGHOST=""
-          else
-            OLDPGHOST="$PGHOST"
-          fi
-          PGHOST=${lib.escapeShellArg runtimeDir}
-          pg_ctl -D "${data_dir}" -w start -o "-c unix_socket_directories=${data_dir} -c listen_addresses= -p ${builtins.toString port}"
-          pg_ctl -D "${data_dir}" -m fast -w stop
-          PGHOST="$OLDPGHOST"
-          unset OLDPGHOST
+          pg_ctl -w start -o "-c unix_socket_directories=${data_dir} -c listen_addresses= -p ${builtins.toString port}"
+          pg_ctl -m fast -w stop
         else 
           echo
           echo "Database directory exists. Skipping initialization"
@@ -151,9 +142,10 @@ in
         name = "run-postgres";
         text = ''
           set -euo pipefail
+          export PGDATA=${data_dir} PGHOST=${runtimeDir} PGPORT=${builtins.toString port}
           mkdir -p ${lib.escapeShellArg runtimeDir}
           ${setupScript}/bin/setup-postgres
-          exec ${package}/bin/postgres -D${data_dir} 
+          exec ${package}/bin/postgres
         '';
       };
     in