dgroomes

Splitting out a Git repo from a Git repo

Git ships with an advanced command called filter-branch which can be used to, among other things, split out a new Git repo from a larger Git repo. Unfortunately, the tool has issues and is officially not recommend by Git. They recommend https://github.com/newren/git-filter-repo as an alternative. git-filter-repo seems like it is worth exploring for use cases beyond the most basic happy path. Fortunately, I have only needed the basic happy path of "split out this sub-directory and all its commit history exactly as is into its own Git repo". For a good illustration of this use case, see https://docs.github.com/en/github/using-git/splitting-a-subfolder-out-into-a-new-repository.

The core command is:

git filter-branch --prune-empty --subdirectory-filter FOLDER-NAME  BRANCH-NAME

dgroomes

Build OpenJDK on macOS

For the most part, follow the instructions at https://github.com/openjdk/jdk/blob/jdk-21%2B35/doc/building.md#tldr-instructions-for-the-impatient.

1. Clone the repository and get the tag you care about

   • git clone https://github.com/openjdk/jdk.git
     cd jdk
     git fetch origin tag jdk-21+35

git checkout jdk-21+35

dgroomes

Upgrade Gradle Wrapper

Execute the following command in a Gradle project to upgrade the Gradle Wrapper to the specified version:

./gradlew wrapper --gradle-version 7.4.2

Reference

dgroomes

Download Maven dependencies using Gradle

Download a Gradle project's Maven dependencies into a directory. For example, you might find this technique useful for very small and simple projects where you want to commit the .jar files directly into Git. This technique was taken from this StackOverflow answer.

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Define a downloadDependencies Gradle task, that when executed, will put all of the project's dependencies into a directory named lib/.

task downloadDependencies(type: Copy) {