fix script

lib.nix

@@ -1,8 +1,7 @@
 { pkgs }:
 let
   inherit (pkgs) lib;
-  pwd = pkgs.runCommand "pwd" { } "realpath .compose>$out";
-  runtime = builtins.readFile pwd;
+  runtime = ".compose";
 in
 {
   mkWrapper =
@@ -56,8 +55,7 @@ in
     pkgs.writeShellApplication {
       inherit name;
       text = ''
-        PC_CONFIG_FILES=${configFile} ${pkgs.process-compose}/bin/process-compose "$@"
-
+        PC_CONFIG_FILES=${configFile} RUNTIME_PATH=$(pwd)/${runtime} ${pkgs.process-compose}/bin/process-compose "$@"
       '';
     };
   mkPostgres =
@@ -72,9 +70,6 @@ in
       ...
     }:
     let
-
-      runtimeDir = "${runtime}/${name}";
-      data_dir = "${runtimeDir}/data";
       merged_config =
         (
           if default_config then
@@ -91,7 +86,7 @@ in
         )
         // config
         // {
-          unix_socket_directories = data_dir;
+          unix_socket_directories = "../socket";
           inherit port listen_addresses;
         };
       toStr =
@@ -128,7 +123,7 @@ in
           echo
           echo "PostgreSQL is setting up the initial database"
           echo
-          pg_ctl -w start -o "-c unix_socket_directories=$(realpath ${runtimeDir}) -c listen_addresses= -p ${builtins.toString port}"
+          pg_ctl -w start -o "-c unix_socket_directories=$PGHOST -c listen_addresses= -p ${builtins.toString port}"
           pg_ctl -m fast -w stop
         else 
           echo
@@ -143,11 +138,11 @@ in
         name = "run-postgres";
         text = ''
           set -euo pipefail
-          mkdir -p ${lib.escapeShellArg runtimeDir}
 
-          PGDATA=${data_dir}
-          PGHOST=${runtimeDir}
+          PGDATA=$RUNTIME_PATH/${name}/data
+          PGHOST=$RUNTIME_PATH/${name}/socket
           PGPORT=${builtins.toString port}
+          mkdir -p $PGHOST
           echo "Starting postgres with PGDATA=''${PGDATA} PGHOST=''${PGHOST} PGPORT=''${PGPORT}"
           export PGDATA PGHOST PGPORT
           ${setupScript}/bin/setup-postgres