1:  1f38ec8039b = 1:  5d474397364 Move PG_MAX_AUTH_TOKEN_LENGTH to libpq/auth.h
2:  9f87ffea1c7 = 2:  20452d21e0b require_auth: prepare for multiple SASL mechanisms
3:  bda684d19cc ! 3:  f0afefb80d6 libpq: handle asynchronous actions during SASL
    @@ src/interfaces/libpq/fe-auth.c: pg_SASL_init(PGconn *conn, int payloadlen)
     +		/*
     +		 * The mechanism should have set up the necessary callbacks; all we
     +		 * need to do is signal the caller.
    ++		 *
    ++		 * In non-assertion builds, this postcondition is enforced at time of
    ++		 * use in PQconnectPoll().
     +		 */
    ++		Assert(conn->async_auth);
    ++		Assert(conn->cleanup_async_auth);
    ++
     +		*async = true;
     +		return STATUS_OK;
     +	}
    @@ src/interfaces/libpq/fe-connect.c: keep_going:						/* We will come back to here
     +				if (!conn->async_auth || !conn->cleanup_async_auth)
     +				{
     +					/* programmer error; should not happen */
    -+					libpq_append_conn_error(conn, "async authentication has no handler");
    ++					libpq_append_conn_error(conn,
    ++											"internal error: async authentication has no handler");
     +					goto error_return;
     +				}
     +
    @@ src/interfaces/libpq/fe-connect.c: keep_going:						/* We will come back to here
     +					/* Done. Tear down the async implementation. */
     +					conn->cleanup_async_auth(conn);
     +					conn->cleanup_async_auth = NULL;
    -+					Assert(conn->altsock == PGINVALID_SOCKET);
    ++
    ++					/*
    ++					 * Cleanup must unset altsock, both as an indication that
    ++					 * it's been released, and to stop pqSocketCheck from
    ++					 * looking at the wrong socket after async auth is done.
    ++					 */
    ++					if (conn->altsock != PGINVALID_SOCKET)
    ++					{
    ++						Assert(false);
    ++						libpq_append_conn_error(conn,
    ++												"internal error: async cleanup did not release polling socket");
    ++						goto error_return;
    ++					}
     +
     +					/*
     +					 * Reenter the authentication exchange with the server. We
    @@ src/interfaces/libpq/fe-connect.c: keep_going:						/* We will come back to here
     +				 * Caller needs to poll some more. conn->async_auth() should
     +				 * have assigned an altsock to poll on.
     +				 */
    -+				Assert(conn->altsock != PGINVALID_SOCKET);
    ++				if (conn->altsock == PGINVALID_SOCKET)
    ++				{
    ++					Assert(false);
    ++					libpq_append_conn_error(conn,
    ++											"internal error: async authentication did not set a socket for polling");
    ++					goto error_return;
    ++				}
    ++
     +				return status;
     +			}
     +
4:  3dc6dd3433c = 4:  711ca3f1efc Add OAUTHBEARER SASL mechanism
5:  97e0a2aae26 = 5:  66ef3b4b687 XXX fix libcurl link error
6:  db0167009b9 = 6:  4df1bc59638 DO NOT MERGE: Add pytest suite for OAuth