potiuk commented on a change in pull request #13422:
URL: https://github.com/apache/airflow/pull/13422#discussion_r550826713



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File path: Dockerfile
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@@ -247,31 +247,54 @@ ENV 
UPGRADE_TO_NEWER_DEPENDENCIES=${UPGRADE_TO_NEWER_DEPENDENCIES}
 
 WORKDIR /opt/airflow
 
-# remove mysql from extras if client is not installed
+# hadolint ignore=SC2086, SC2010
 RUN if [[ ${INSTALL_MYSQL_CLIENT} != "true" ]]; then \
+        # Remove mysql from extras if client is not installed \
         AIRFLOW_EXTRAS=${AIRFLOW_EXTRAS/mysql,}; \
     fi; \
     if [[ ${INSTALL_FROM_PYPI} == "true" ]]; then \
         if [[ "${UPGRADE_TO_NEWER_DEPENDENCIES}" != "false" ]]; then \
             pip install --user 
"${AIRFLOW_INSTALLATION_METHOD}[${AIRFLOW_EXTRAS}]${AIRFLOW_INSTALL_VERSION}" \
                 --upgrade --upgrade-strategy eager; \
+            pip install --upgrade "pip==${AIRFLOW_PIP_VERSION}"; \

Review comment:
       I think it might not solve it. I have no 100% certainly but 
`--constraint` is not really binding (at least for pip 20.2.4). When you are 
upgrading with `eager` strategy, PIP often installs dependencies which are not 
within constraints. Constraint is merely a "hint" which does not have to be 
followed (and especially with 'eager' upgrade strategy.
   
   I think I prefer to explicitly force pip version by installing it explicitly 
after. 




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