Matthias Pohl created FLINK-32734:
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Summary: Add .mvn/maven.config to .gitignore
Key: FLINK-32734
URL: https://issues.apache.org/jira/browse/FLINK-32734
Project: Flink
Issue Type: Improvement
Components: Build System
Affects Versions: 1.18.0, 1.19.0
Reporter: Matthias Pohl
FLINK-28016 allowed Flink to switch to newer (i.e. 3.2.5+) Maven versions.
Maven 3.3.1 introduced certain local configuration files that are automatically
injected (e.g. {{.mvn/jvm.options}} and {{.mvn/maven.config}}).
The former one is actively used (and checked into the repository) to define
certain Java-related requirements. {{.mvn/maven.config}} instead, is not
utilized right now. It can be used, though, to customize the Maven execution to
once needs (e.g. always skipping {{flink-runtime-web}} through
{{-Pskip-webui-build}}).
To be fair, that would be also possible through the
{{${user.home}/.m2/settings.xml}} through profiles. There are certain
configuration parameters, though, that are not configurable easily through
profiles.
Configuring a checkout-specific local repository isn't possible.
Checkout-specific local repositories are handy, though when working in multiple
Flink checkouts (e.g. one checkout for reviews and one for contributions).
Using a single local repository would cause problems when working on a branch
locally while reviewing other PRs (and checking them out) that touch the same
files.
A workaround for such a scenario would be to have a checkout-specific
settings.xml that specifies a checkout-specific local repository.
To support this, I'm suggesting to add {{.mvn/maven.config}} to {{.gitignore}}
for now. That would allow the developer to enable specific Maven parameters by
default that match his/her needs.
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