mik-laj commented on a change in pull request #13409:
URL: https://github.com/apache/airflow/pull/13409#discussion_r552412530



##########
File path: scripts/docker/install_airflow_from_latest_master.sh
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@@ -0,0 +1,43 @@
+#!/usr/bin/env bash
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# shellcheck disable=SC2086
+
+# Installs Airflow from latest master. This is pure optimisation. It is done 
because we do not want
+# to reinstall all dependencies from scratch when setup.py changes. Problem 
with Docker caching is that
+# when a file is changed, when added to docker context, it invalidates the 
cache and it causes Docker
+# build to reinstall all dependencies from scratch. This can take a loooooot 
of time. Therefore we install
+# the dependencies first from master (and uninstall airflow right after) so 
that we can start installing
+# deps from those pre-installed dependencies. It saves few minutes of build 
time when setup.py changes.
+#
+# If INSTALL_MYSQL_CLIENT is set to false, mysql extra is removed
+#
+function install_airflow_from_latest_master() {

Review comment:
       ```suggestion
   test -v INSTALL_MYSQL_CLIENT
   test -v AIRFLOW_INSTALL_USER_FLAG
   test -v AIRFLOW_REPO
   test -v AIRFLOW_BRANCH
   test -v AIRFLOW_CONSTRAINTS_LOCATION
   test -v AIRFLOW_PIP_VERSION
   
   function install_airflow_from_latest_master() {
   ```




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