docker-run-database-client

#!/bin/sh -eu

# docker-run-database-client: invoke SQL DBMS command line client
# Copyright (C) 2019  "Michael G. Morey" <mgmorey@gmail.com>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

ENV_FILE=$HOME/.env

abort() {
    printf "$@" >&2
    exit 1
}

assert() {
    "$@" || abort '%s: Assertion failed: %s\n' "$0" "$*"
}

docker_run_database_client() {
    docker run -it $options \
	   $(get_database_image_name) \
	   $(get_database_client_command)
}

get_database_client_command() {
    case "$DATABASE_DIALECT" in
	(mysql)
	    printf '%s\n' mysql \
		   --protocol=${DATABASE_PROTOCOL:-TCP} \
		   --host=${DATABASE_HOST:-localhost} \
		   --port=${DATABASE_PORT:-3306} \
		   --user=${DATABASE_USER:-$USER} \
		   --password=${DATABASE_PASSWORD:-}
	    ;;
	(oracle)
	    printf '%s\n' sqlplus \
		   "system/${DATABASE_PASSWORD}@//localhost:5121/ORCLCDB"
	    ;;
	(postgresql)
	    printf '%s\n' psql \
		   --host=${DATABASE_HOST:-localhost} \
		   --port=${DATABASE_PORT:-5432} \
		   --username=${DATABASE_USER:-$USER} \
		   --password
	    ;;
    esac
}

get_database_image_name() {
    case "$DATABASE_DIALECT" in
	(mysql)
	    printf '%s\n' mysql
	    ;;
	(oracle)
	    printf '%s\n' oracle/database:19.3.0-se2
	    ;;
	(postgresql)
	    printf '%s\n' postgres
	    ;;
    esac
}

parse_arguments() {
    if [ $# -gt 0 ]; then
	options="$@"
    else
	options="--network=host --rm"
    fi
}

if [ ! -r $ENV_FILE ]; then
    abort '%s: %s: No such environment file\n' "$0" $ENV_FILE
fi

if [ -r $HOME/${ENV_FILE-.env} ]; then
    . $HOME/${ENV_FILE-.env}
fi

parse_arguments "$@"
docker_run_database_client