Quickly get started with a new database + user

setup-db-commands.py

#!/usr/bin/env python3

from pprint import pprint
from random import randint
import sys

# Database name required

def print_err(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)

if len(sys.argv) < 2:
    print_err("Usage:")
    print_err("  createcomamnds DATABASE_NAME")
    sys.exit(1)

db_name = sys.argv[1]
db_user = sys.argv[1]

hex_num2letter = {
    0: '0', 1: '1', 2: '2', 3: '3', 4: '4',
    5: '5', 6: '6', 7: '7', 8: '8', 9: '9',
    10: 'a', 11: 'b', 12: 'c', 13: 'd',
    14: 'e', 15: 'f'
}

def random_hex(count=40):
    return "".join(
        [hex_num2letter[randint(0, 15)]
         for x in range(count)]
    )

db_pass = random_hex(40)

print(f"""

Follow the steps below to create a new database {db_name} and a
user.

1. Create the user and the database

    $ sudo -u postgres createdb {db_name}
    $ sudo -u postgres createuser {db_user}

2. Set the password for the user

    $ sudo -u postgres psql
    postgres=# \\password {db_user}
    Enter new password: {db_pass}

3. Connect with one of the following connection strings:

    "postgresql://localhost/{db_name}?user={db_user}&password={db_pass}\"
    "jdbc:postgresql://localhost/{db_name}?user={db_user}&password={db_pass}\"

""".strip())