How Does Go 1.5 Solve Package Version Management Challenges?

Package Version Management in Go 1.5

In Go, package version management has been a topic of debate due to the lack of a built-in solution. Go developers fetch packages from HEAD using go get and import statements, limiting their ability to specify versions or branches.

This limitation has raised concerns about package evolution, API breakage, and enterprise adoption. Developers may feel the need to create separate repositories for major versions and face challenges in downgrading to earlier versions. Additionally, the Git-repo-per-version approach can lead to fragmented Git histories and potential conflicts.

Go 1.5 addresses these concerns with the vendoring feature. By creating a vendor folder and manually importing the desired versions of dependent packages, developers gain control over the exact versions they want. This prevents surprises caused by automatic updates from HEAD.

Vendoring isolates package dependencies within the vendor folder, ensuring that packages are only importable from the directory containing the vendor folder. This allows for version locking and prevents unintended upgrades or downgrades.

To enable vendoring, the GO15VENDOREXPERIMENT=1 environment variable must be set when running the go command. This experimental feature will become a full feature in Go 1.6.

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