self-hosting fabfile

fabfile.py

if __name__ == '__main__':
    # a neat hack that makes this file a "self-hosting" fabfile,
    # ie it is invoked directly but still gets all the fabric niceties
    # like real option parsing, including --help and -l (for listing
    # commands). note that as of fabric 1.10, the file for some reason
    # needs to end in .py, despite what the documentation says.  see:
    # http://docs.fabfile.org/en/1.4.2/usage/fabfiles.html#fabfile-discovery
    #
    # the .index() manipulation below should make this work regardless of
    # whether this is invoked from shell as "./foo.py" or "python foo.py"
    from fabric.main import main as fmain
    patched_argv = ['fab', '-f', __file__, ] + \
                   sys.argv[sys.argv.index(__file__)+1:]
    sys.argv = patched_argv
    with warnings.catch_warnings():
        warnings.simplefilter("ignore")
        fmain()