Snippet: Ensure script is run with correct user by re-running with sudo

snippet_auto_sudo.sh

# Ensure this script is run with the correct user by checking
RUNAS_USER="svcuser"

# Can use "$USER" instead of "$(id -un)" if the environment
# variable can be trusted; saves the exec(2) of the `id` which
# could be important -- because exec's are a bit more expensive
# and `id` can incur the overhead of a slow nameservice lookup.
# These would be important in a script used to shutdown or otherwise
# recover a system that is in distress due to resource starvation,
# for example.
if [[ "$(id -un)" != "$RUNAS_USER" ]]; then
    # sudo: Include "-H" to initialize HOME;
    #       use "-i" instead for full initial login setup
    exec sudo -H -u "$RUNAS_USER" "$0" "$@"
fi