fix: roundup-demo, interactive mode would nuke an existing tracker. Tonu Mikk demonstrated a bug in roundup-demo. When invoked without a tracker home on the command line, it would nuke an existing directory specified interactively. There is still a minor bug. If an invalid home directory is specified, roundup-demo will prompt for the template to use before reporting: Error: Refusing to nuke non-tracker directory: but this doesn't cause data loss so not worth fixing at this time.

#!/usr/bin/env python

# Roundup requires Python 2.7+ as mentioned in doc\installation.txt
from __future__ import print_function
import sys

VERSION_NEEDED = (2, 7)

if sys.version_info < VERSION_NEEDED:
    print("Content-Type: text/plain\n")
    print("Roundup requires Python %s.%s or newer." % VERSION_NEEDED)
    sys.exit(0)