#!/bin/sh
# Restaure un dump dans une base jetable et compare les comptages à la base source.
# C'est ce script qui fait la différence entre "on a des fichiers" et "on a des sauvegardes".
set -eu

FILE=${1:?usage: restore-check.sh <fichier.dump>}
CONTAINER=${CONTAINER:-myim_postgres}
DB=${POSTGRES_DATABASE:-my_info_mate}
DB_USER=${POSTGRES_USER:-mym}
SCRATCH="restore_check_$(date -u +%s)"

psql_scratch() { docker exec "$CONTAINER" psql -qtAX --username="$DB_USER" --dbname="$1" -c "$2"; }

docker exec "$CONTAINER" createdb --username="$DB_USER" "$SCRATCH"
trap 'docker exec "$CONTAINER" dropdb --username="$DB_USER" --if-exists "$SCRATCH"' EXIT

docker exec -i "$CONTAINER" pg_restore \
  --username="$DB_USER" --dbname="$SCRATCH" --no-owner --no-privileges < "$FILE"

TABLES=$(psql_scratch "$DB" "select tablename from pg_tables where schemaname='public' order by tablename")

printf '%-28s %10s %10s\n' TABLE SOURCE RESTORE
echo "$TABLES" | while read -r t; do
  [ -n "$t" ] || continue
  a=$(psql_scratch "$DB" "select count(*) from public.\"$t\"")
  b=$(psql_scratch "$SCRATCH" "select count(*) from public.\"$t\"")
  if [ "$a" = "$b" ]; then mark=""; else mark="  <-- ECART"; fi
  printf '%-28s %10s %10s%s\n' "$t" "$a" "$b" "$mark"
done