ashb 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_r299358987
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File path: hooks/build
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@@ -143,12 +147,33 @@ echo
# Extract python version from image name we want to build in case it was passed
# Via IMAGE_NAME
-# This nice bash construct below extracts last field after '-' delimiter
-# So for example 'latest-3.6' will produce PYTHON_VERSION=3.6
-PYTHON_VERSION=$(echo "${LOCAL_IMAGE}" | rev | cut -d '-' -f1 | rev )
-export PYTHON_VERSION
+# This nice bash construct below extracts last field after '-python' delimiter
+# So for example 'airflow:master-python3.6' will produce
LONG_PYTHON_VERSION=python3.6
+LONG_PYTHON_VERSION=$(echo "${LOCAL_IMAGE}" | rev | cut -d '-' -f1 | rev )
Review comment:
The `##` in bash does this without a pipeline
https://www.tldp.org/LDP/abs/html/parameter-substitution.html
```bash
$ bash -c 'x="airflow:master-python3.6"; echo ${x##*-}'
python3.6
```
```suggestion
LONG_PYTHON_VERSION="${LOCAL_IMAGE##*-}"
```
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