tests/test-bad-pull.t

tests: add script to disable a selected wire protocol capability

This can be used to test that the client and server both fall back to the
previous wire protocol when the capability is not supported.

It is currently used by test-push-http.t and I plan to use it for the HTTP
long argument support tests.

  $ hg clone http://localhost:$HGPORT/ copy
  abort: error: Connection refused
  [255]

  $ test -d copy || echo copy: No such file or directory
  copy: No such file or directory

  $ cat > dumb.py <<EOF
  > import BaseHTTPServer, SimpleHTTPServer, os, signal
  > def run(server_class=BaseHTTPServer.HTTPServer,
  >         handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
  >     server_address = ('localhost', int(os.environ['HGPORT']))
  >     httpd = server_class(server_address, handler_class)
  >     httpd.serve_forever()
  > signal.signal(signal.SIGTERM, lambda x: sys.exit(0))
  > run()
  > EOF

  $ python dumb.py 2>/dev/null &
  $ echo $! >> $DAEMON_PIDS

give the server some time to start running

  $ sleep 1

  $ hg clone http://localhost:$HGPORT/foo copy2 2>&1
  abort: HTTP Error 404: * (glob)
  [255]

  $ kill $!