nix: Install and initialize a Postgres DB For a persistance layer, this change introduces postgresql as dependency. The daemon is started when `nix-shell` is invoked. `pg_ctl stop` is not invoked, and this has to be done by a developer. Data is persisted in a tmp directory, which is added to the ignore file.

zj

Jul 15, 2021, 11:52 AM

EIIUUAKGFBWJJ67QKWXX3X7TC2ASQIAUZV4734C5KQKWNHOVYJGAC

Dependencies

• [2] W3M3C7CC Initial commit This change includes a very small hello world application server written in Rust using Rocket.rs. Managing dependencies is done with Nix as that works well between Linux and Mac for me.

Change contents

• edit in shell.nix at line 14
  [2.1152]

  [2.1152]
  + # Database

  + pkgs.buildPackages.postgresql

  +
• edit in shell.nix at line 20
  [2.1215]

  [2.1215]
  +

  + shellHook = ''

  + export PGDATA=$PWD/tmp/postgres_data

  + export PGHOST=$PWD/tmp/postgres

  + export LOG_PATH=$PWD/tmp/postgres/LOG

  + export PGDATABASE=postgres

  + export DATABASE_URL="postgresql:///postgres?host=$PGHOST"

  + if [ ! -d $PGHOST ]; then

  + mkdir -p $PGHOST

  + fi

  + if [ ! -d $PGDATA ]; then

  + echo 'Initializing postgresql database...'

  + initdb $PGDATA --auth=trust >/dev/null

  + fi

  + pg_ctl start -l $LOG_PATH -o "-c listen_addresses= -c unix_socket_directories=$PGHOST"

  + '';
• file addition: .ignore (----------)
  [1.0]
  + /target

  + /tmp