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#!/usr/bin/env bash
### Create a database backup.
###
### Usage:
### $ docker compose -f <environment>.yml (exec |run --rm) postgres backup
set -o errexit
set -o pipefail
set -o nounset
working_dir="$(dirname ${0})"
source "${working_dir}/_sourced/constants.sh"
source "${working_dir}/_sourced/messages.sh"
message_welcome "Backing up the '${POSTGRES_DB}' database..."
if [[ "${POSTGRES_USER}" == "postgres" ]]; then
message_error "Backing up as 'postgres' user is not supported. Assign 'POSTGRES_USER' env with another one and try again."
exit 1
fi
export PGHOST="${POSTGRES_HOST}"
export PGPORT="${POSTGRES_PORT}"
export PGUSER="${POSTGRES_USER}"
export PGPASSWORD="${POSTGRES_PASSWORD}"
export PGDATABASE="${POSTGRES_DB}"
backup_filename="${BACKUP_FILE_PREFIX}_$(date +'%Y_%m_%dT%H_%M_%S').sql.gz"
pg_dump | gzip > "${BACKUP_DIR_PATH}/${backup_filename}"
message_success "'${POSTGRES_DB}' database backup '${backup_filename}' has been created and placed in '${BACKUP_DIR_PATH}'."
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