DockerPostgresMigration/migrate.sh

#!/bin/bash
echo Migrate PostgreSQL version

DB_PATH=/db
OLD_DB_PATH=/tmp/old_db
NEW_DB_PATH=/tmp/new_db

# Handle password
if [ -z "$POSTGRES_PASSWORD" ] || [ "$POSTGRES_PASSWORD" == " " ];
then
    echo "Please specify database password in POSTGRES_PASSWORD env variable!"
    exit 1;
fi

# Run database on a COPY of the database
cp -r "$DB_PATH" "$OLD_DB_PATH"

# Initialize NEW database
mkdir "$NEW_DB_PATH"
/postgres/17/bin/initdb -D "$NEW_DB_PATH" --username "$POSTGRES_USER" --pwfile=<(printf "%s\n" "$POSTGRES_PASSWORD") || exit 1


# Perform migration
cd /tmp
/postgres/17/bin/pg_upgrade -b /postgres/16/bin/ -d "$OLD_DB_PATH" -D "$NEW_DB_PATH" -U "$POSTGRES_USER" || exit 2


# Replace database
echo "Replace database files..."
rm -rf "$DB_PATH"/*
cp -r "$NEW_DB_PATH"/* "$DB_PATH"
mv "$OLD_DB_PATH" "$DB_PATH"

echo "Done with migration."