Fokko commented on a change in pull request #4938: [AIRFLOW-4117] Multi-staging 
Image - Travis CI tests [Step 3/3]
URL: https://github.com/apache/airflow/pull/4938#discussion_r297397229
 
 

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 File path: Dockerfile
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 @@ -278,6 +278,34 @@ RUN echo "Pip version: ${PIP_VERSION}"
 
 RUN pip install --upgrade pip==${PIP_VERSION}
 
+ARG AIRFLOW_REPO=apache/airflow
+ENV AIRFLOW_REPO=${AIRFLOW_REPO}
+
+ARG AIRFLOW_BRANCH=master
+ENV AIRFLOW_BRANCH=${AIRFLOW_BRANCH}
+
+ENV 
AIRFLOW_GITHUB_DOWNLOAD=https://raw.githubusercontent.com/${AIRFLOW_REPO}/${AIRFLOW_BRANCH}
+# Get basic dependencies from the master version of Airflow in order to avoid 
cache invalidation
 
 Review comment:
   Can we be more explicit when and why we need this? This might break your 
local build without you doing any changes.

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