[GitHub] [airflow] leahecole commented on a change in pull request #19867: Initial commit for new Breeze project

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leahecole commented on a change in pull request #19867:
URL: https://github.com/apache/airflow/pull/19867#discussion_r758654751



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File path: dev/breeze/doc/adr/0002-implement-standalone-python-command.md
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@@ -0,0 +1,178 @@
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+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
+
+- [2. Implement standalone python command](#2-implement-standalone-python-command)
+  - [Status](#status)
+  - [Context](#context)
+  - [Decision](#decision)
+  - [Consequences](#consequences)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+# 2. Implement standalone python command
+
+Date: 2021-11-28
+
+## Status
+
+Draft
+
+## Context
+
+The [Breeze](https://github.com/apache/airflow/blob/main/BREEZE.rst) is
+a command line development environment for Apache Airflow that makes
+it easy to setup Airflow development and test environment easily
+(< 10 minutes is the goal) and enable contributors to run any subset
+of tests that are executed in our CI environment easily.
+
+The environment has proven to be very useful (it has successfully onboarded
+a number of new contributors, and it makes the development environment of
+even seasoned contributors much easier as it provides a very easy
+replication of the CI environment as well as very easy to setup test
+environment that can be used to run:
+
+* Unit tests
+* Integration tests
+* Kubernetes/Helm tests
+* System tests
+
+It also serves as a base for our CI execution environment. The same scripts and tools are used
+in our CI (based on GitHub actions). A lot of common code and function between CI and Breeze are
+shared between the CI and Breeze. All those tools are held in "ci" package.
+
+Unfortunately, Breeze is largely based on Bash code - for which very few people (except maybe the
+Breeze creator - Jarek Potiuk, the author of this document) have any other feeling that uneasiness,
+disgust and fear of it :).  Since Airflow is largely based on Python, the common consensus is that
+Breeze should be rewritten in Python.
+
+In November 2021, Outreachy sponsored two internship for two interns: @Bowrna and @edithturn were assigned to
+the projects:
+
+* Convert Airflow Local Development environment `Breeze` - from Bash-based to Python-based
+* Rewrite Github Action workflows to Python
+
+With @potiuk, @eladkal and @xurror as mentors.
+
+The long-standing issues about those two projects are (and we hope to close the projects during the
+three months internship - December 2021 - March 2022):
+
+* https://github.com/apache/airflow/issues/12282
+* https://github.com/apache/airflow/issues/13182
+
+There are a number of problems with Bash scripts:
+
+* They are difficult to understand, modify and debug as Bash "magic" is somewhat arcane
+* They are difficult to implement complex logic with
+* Navigating common code that is used from the scripts is cumbersome and lack IDE/tools support
+* Default Bash on MacOS is very old (from 3.* line) and it will not be updated to a newer version
+  which impacts cross-platform Breeze applicability
+* Bash only work for Windows well in WSL2 environment, which further undermines cross-platform

Review comment:
       ```suggestion
   * Bash only works well for Windows in WSL2 environment, which further undermines cross-platform
   ```
   
   small grammar nit

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File path: pyproject.toml
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@@ -16,5 +16,5 @@
 # under the License.
 [tool.black]
 line-length = 110
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py36', 'py37', 'py38', 'py39']

Review comment:
       Do we also want to add 3.10, or do you only want to keep it in line with what is currently supported in Airflow?




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