Cleanup docker before 2.3.0b1 release scripts/Docker/Dockerfile Document/implement pip_sdist source mode for testing the source distribution. Change from multiple if's to case statement. Disable verbose tracing of shells script. Use --build-arg="VERBOSE=1" to enable set -xv. scripts/Docker/roundup_start Report error if demo mode is used with 2.2.0. This catches the easiest case where build is done using pypi before 2.3.0 final is released. Indent demo mode PORT_8080 doc block so it's not lost in a wall of text. doc/installation.txt Document all source --build-args including how to build from pypi using a version specifier. Break out other uses of --build-arg into code blocks. Reference docker compose section rather than referencing docker-compose.yml. Clarify docker hub tagging for devel releases. Minor formatting fixes.

#!/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)