db/scripts/migrate.sh

#! /bin/bash

set -e

source ./scripts/env.sh ./.env

if [[ -n $(git status --porcelain) ]]; then
  echo "git working tree dirty" 1>&2;
  exit 1;
fi

to_tag="$1"

get_dnim_database_count="copy (select count(*) from pg_database where datname = 'dnim') to stdout with null as '';"
dnim_database_count=$(psql "$POSTGRES_URI/postgres" -c "$get_dnim_database_count")

if [[ "$dnim_database_count" = "0" ]]; then
  echo "fresh database"
  psql "$POSTGRES_URI/postgres" -c "create database dnim;"
  ls ./schema/ | xargs -I{} psql --quiet "$POSTGRES_URI/dnim" --file=./schema/{} 1>/dev/null
  last_revision='empty'
  script=''
else
  get_last_revision="copy (select to_revision from migration order by performed_on desc limit 1) to stdout with null as '';"
  last_revision=$(psql "$POSTGRES_URI/dnim" -c "$get_last_revision")
  migration_file=$(./scripts/diff.sh "$last_revision")

  if [[ "$2" = "--greenlight" ]]; then
    psql "$POSTGRES_URI/dnim" -v ON_ERROR_STOP=1 --single-transaction -f "$migration_file"
  else
    echo "migration available at $migration_file"
    echo "review and rerun with --greenlight to apply"
    exit
  fi
fi

insert_migration="insert into migration (from_revision, to_revision, script) values ('$last_revision', '$to_tag', \$migration\$$script\$migration\$);"
psql "$POSTGRES_URI/dnim" -c "$insert_migration"
echo "inserted migration"